WO2017155108A1 - Belt-type grinding tool - Google Patents

Belt-type grinding tool Download PDF

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Publication number
WO2017155108A1
WO2017155108A1 PCT/JP2017/009776 JP2017009776W WO2017155108A1 WO 2017155108 A1 WO2017155108 A1 WO 2017155108A1 JP 2017009776 W JP2017009776 W JP 2017009776W WO 2017155108 A1 WO2017155108 A1 WO 2017155108A1
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WO
WIPO (PCT)
Prior art keywords
locking member
locking
support bar
pulley support
tension
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2017/009776
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French (fr)
Japanese (ja)
Inventor
秀晴 渡辺
賢典 東
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nitto Kohki Co Ltd
Original Assignee
Nitto Kohki Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nitto Kohki Co Ltd filed Critical Nitto Kohki Co Ltd
Priority to CN201780015190.6A priority Critical patent/CN108778622B/en
Priority to GB1813611.9A priority patent/GB2562440B/en
Priority to KR1020187025676A priority patent/KR102116228B1/en
Priority to JP2018504617A priority patent/JP6516920B2/en
Priority to DE112017001275.9T priority patent/DE112017001275B4/en
Publication of WO2017155108A1 publication Critical patent/WO2017155108A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/06—Portable grinding machines, e.g. hand-guided; Accessories therefor with abrasive belts, e.g. with endless travelling belts; Accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/18—Accessories
    • B24B21/20—Accessories for controlling or adjusting the tracking or the tension of the grinding belt
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B24B23/026—Fluid driven
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/04—Protective covers for the grinding wheel
    • B24B55/05—Protective covers for the grinding wheel specially designed for portable grinding machines

Definitions

  • the present invention relates to a belt-type grinding tool, and more particularly, to a belt-type grinding tool having a structure for holding a pulley support bar in a retracted position when replacing an endless grinding belt.
  • a belt-type grinding tool includes a drive pulley that is driven to rotate by a motor, a rotatable idle pulley, and an endless grinding belt that is wound between the drive pulley and the idle pulley, and is used to rotate the drive pulley.
  • a grinding tool that grinds an object by bringing an endless grinding belt that is rotationally driven into contact with the object.
  • a pulley support bar that supports the idle pulley is slidably held in a front-rear direction on a tool body provided with a drive pulley, and is urged forward by a spring provided in the tool body. When the idle pulley is pressed against the inner peripheral surface of the endless grinding belt by the urging force of the spring, an appropriate tension is applied to the endless grinding belt wound around the drive pulley and the idle pulley.
  • a locking structure for holding the pulley support bar in the retracted position is provided.
  • an opening communicating with an internal space for slidingly holding a pulley support bar is formed in a tool body, and an L-shaped locking member (push button) is disposed in the opening, and the locking member The pulley support bar is held in the retracted position by engaging the pulley support bar.
  • the present invention is a belt type that prevents foreign matter from entering into the tool body from the gap between the locking member that locks the pulley support bar and the tool body.
  • An object is to provide a grinding tool.
  • a pulley support bar having an idle pulley extending in the direction of the longitudinal axis from the front end portion to the rear end portion and rotatably attached to the front end portion;
  • a tool body provided with a drive pulley that is rotationally driven by a motor, and having a bar housing hole for receiving the rear end portion of the pulley support bar, and a locking member housing hole having a circular cross section substantially orthogonal to the bar housing hole
  • a tension applying position that applies tension to the endless grinding belt that is wound between the idle pulley and the drive pulley, and a tension applied to the endless grinding belt that is retracted from the tension applying position.
  • a tool body for slidably holding in the direction of the longitudinal axis between the tension release position to be released;
  • a tension applying spring that is set between the pulley support bar and the tool body and biases the pulley support bar toward the tension applying position;
  • a substantially cylindrical locking member slidably disposed in the locking member receiving hole, wherein the pulley support bar in the tension release position is locked in the locking member receiving hole to A locking position for holding the pulley support bar at the tension release position, and a lock release position at which the locking is released and the pulley support bar can be displaced between the tension applying position and the tension releasing position.
  • a locking member displaceable between, An annular seal member disposed between the outer peripheral surface of the locking member and the inner peripheral surface of the locking member accommodation hole;
  • a belt-type grinding tool is provided.
  • the seal member is disposed between the outer peripheral surface of the locking member and the inner peripheral surface of the locking member accommodation hole, grinding is performed from the gap between the locking member and the tool body. It is possible to prevent foreign matters such as powder and dust from entering the tool body.
  • the sealing member is attached to the locking member and the tool body. It comes to contact
  • the substantially cylindrical locking member is held by the locking member receiving hole having a circular cross section, it is easy to reduce rattling of the locking member as compared with the conventional plate-shaped locking member. It becomes. As a result, the state in which the gap between the locking member and the tool body is closed can be more reliably maintained, and the entry of foreign matter into the tool body can be more reliably prevented.
  • the seal member has an inner peripheral portion that is in close contact with the outer peripheral surface of the locking member, an outer peripheral portion that is in close contact with the inner peripheral surface of the locking member holding hole, the inner peripheral portion, and the outer peripheral portion. And a flexible portion that is connected so as to be relatively displaceable in the direction of the central axis of the seal member.
  • the locking member has an annular seal member holding groove on the outer peripheral surface
  • the locking member holding hole has a diameter-expanded portion that is diameter-expanded on the outer surface of the tool body,
  • the inner peripheral portion of the seal member can be inserted and held in the seal member holding groove, and the outer peripheral portion can be disposed in close contact with the enlarged diameter portion of the locking member holding hole.
  • Such a configuration makes it possible to more reliably maintain the close contact state between the seal member, the locking member, and the tool body.
  • the pulley support bar has a locking groove formed at the rear end;
  • the locking member has a through-hole through which the rear end of the pulley support bar passes, and the through-hole is provided with a locking projection protruding inward from a part of the inner peripheral surface thereof;
  • the locking member is displaced to the locking position while the pulley support bar is in the tension release position, so that the locking projection of the locking member engages with the locking groove and the pulley support The bar can be held in the tension release position.
  • a locking spring that is set between the tool body and the locking member and biases the locking member toward the locking position can be further provided.
  • FIG. 3 is a top sectional view taken along line III-III in FIG. 1.
  • FIG. 4 is a front sectional view taken along line IV-IV in FIG. 1.
  • FIG. 4 is an enlarged view around a locking member of the belt-type grinding tool of FIG. 3. It is a front view of a locking member. It is sectional drawing of a sealing member.
  • FIG. 3 is a side view of the belt-type grinding tool of FIG. 2 when a pulley support bar is in a tension release position.
  • FIG. 9 is a top sectional view taken along line IX-IX in FIG. 8.
  • the belt-type grinding tool 1 includes a tool body 10, a pulley support bar 12 held by the tool body 10, and a cover attached to the tool body 10. 14, a drive pulley 16 attached to the tool body 10 inside the cover 14, and an idle pulley 18 attached rotatably at the front end 12 a of the pulley support bar 12.
  • the drive pulley 16 is fixed to a drive shaft 19 a of an air motor 19 disposed in the tool body 10 and is driven to rotate by the air motor 19.
  • An endless grinding belt 20 is wound between the drive pulley 16 and the idle pulley 18.
  • an operating lever 22 provided on the tool body 10 By operating an operating lever 22 provided on the tool body 10 so as to be pivotable, compressed air supplied from an air supply port 24 at the rear end 10a of the tool body 10 passes through an air supply path 26 and is supplied to an air motor 19.
  • the endless grinding belt 20 is rotationally driven via the drive pulley 16 by the air motor 19 being rotationally driven by the compressed air.
  • the pulley support bar 12 extends in the direction of the longitudinal axis L from a front end portion 12 a that rotatably holds the idle pulley 18 to a rear end portion 12 b that is accommodated in the tool body 10.
  • the front end portion 12a is provided with an adjusting mechanism 28 for finely adjusting the angle of the idle pulley 18 with respect to the longitudinal axis L.
  • the rear end portion 12b has a cylindrical shape, and is held so as to be slidable in the direction of the longitudinal axis L with respect to the bar accommodating hole 29 provided in the tool body 10.
  • a spring accommodating hole 12c extending forward from the rear end is formed in the rear end portion 12b, and a tension applying spring 30 is disposed in the spring accommodating hole 12c.
  • the pulley support bar 12 is urged forward (leftward in the drawing) with respect to the tool body 10.
  • the idle pulley 18 is pressed against the inner peripheral surface of the endless grinding belt 20 by the urging force of the tension applying spring 30 to apply tension to the endless grinding belt 20.
  • the rear end portion 12b of the pulley support bar 12 is further formed with a long hole 12d extending in the direction of the longitudinal axis L.
  • the tip of the bolt 32 attached to the tool body 10 is The elongated hole 12d is accommodated.
  • the position of the pulley support bar 12 that can be displaced in the direction of the longitudinal axis L with respect to the tool body 10 is limited by the length of the elongated hole 12d in the direction of the longitudinal axis L, and the longitudinal axis L Rotation around is prevented.
  • the tool body 10 is formed with a locking member receiving hole 33 having a circular cross section extending in a direction substantially orthogonal to the bar receiving hole 29, and this locking member receiving hole 33.
  • a substantially cylindrical locking member 34 is disposed in the inside.
  • the locking member 34 has an annular seal member holding groove 34 b formed on the outer peripheral surface 34 a, a through hole 34 c that penetrates the center portion, and a spring holding portion 34 d at the top. .
  • the through-hole 34c has a slightly vertically long elliptical shape, and a crescent-shaped locking projection 34e protruding inward is formed at the upper center position of the inner peripheral surface thereof.
  • a locking spring 36 is set between the tool body 10 and the spring holding portion 34 d of the locking member 34.
  • the locking member 34 is biased laterally (downward as viewed in FIGS. 3 and 5) by a locking spring 36.
  • An annular seal member 38 is attached between the locking member 34 and the tool body 10.
  • the seal member 38 has a shape as shown in FIG. 7 in a state where no external force is applied, and seals the inner peripheral portion 38a, the outer peripheral portion 38b, and the inner peripheral portion 38a and the outer peripheral portion 38b. It consists of the curved flexible part 38c connected so that it can displace relatively in the direction of the central axis M of the member 38.
  • the inner peripheral portion 38 a is attached in the seal member holding groove 34 b of the locking member 34 and is in close contact with the outer peripheral surface 34 a of the locking member 34.
  • the locking member accommodation hole 33 of the tool body 10 has an enlarged diameter portion 33a whose diameter is enlarged on the outer surface 10b of the tool body 10, and the outer peripheral portion 38b is an inner periphery of the locking member accommodation hole 33 in the enlarged diameter portion 33a. It is in close contact with the surface 33c. More specifically, the outer peripheral portion 38b is pressed against and closely contacts the bottom surface 33b of the enlarged diameter portion 33a and also closely contacts the inner peripheral surface 33c of the enlarged diameter portion 33a. In the state of FIG. 5, the inner peripheral portion 38 a of the seal member 38 is drawn into the tool body 10 together with the locking member 34, but the outer peripheral portion 38 b is engaged with the enlarged diameter portion 33 a of the locking member accommodation hole 33. It is stopped and its position is maintained.
  • the pulley support bar 12 is biased forward by a tension applying spring 30 and is in a tension applying position where tension is applied to the endless grinding belt 20, and the locking member 34 is supported by the pulley.
  • the bar 12 is in the unlocking position allowing displacement in the direction of the longitudinal axis L.
  • the pulley support bar 12 was pushed backward (to the right in the figure) against the urging force of the tension applying spring 30 and provided at the rear end portion 12 b of the pulley support bar 12.
  • the locking groove 12e is displaced to a position where it is aligned with the locking projection 34e of the locking member 34, the locking member 34 is moved downward as viewed in the figure by the urging force of the locking spring 36, as shown in FIG.
  • the locking projection 34e becomes a locking position where it engages with the locking groove 12e.
  • the pulley support bar 12 is held at the tension release position.
  • the distance between the idle pulley 18 and the drive pulley 16 is approaching, and no tension is applied to the endless grinding belt 20.
  • the inner peripheral portion 38 a of the seal member 38 is slightly pushed out of the tool body 10 together with the locking member 34, but the outer peripheral portion 38 b is still maintained in close contact with the enlarged diameter portion 33 a of the locking member accommodation hole 33. Yes.
  • the cover 14 attached to the tool body 10 with the attachment screw 42 has a pressing protrusion 14 a (FIG. 5) that protrudes toward the locking member 34 at a position aligned with the locking member 34.
  • the locking member 34 In the state where is attached, the locking member 34 is prevented from being displaced to the locking position by the pressing projection 14 a, so the pulley support bar 12 is not held in the tension releasing position by the locking member 34. Therefore, in order to lock the pulley support bar 12 at the tension release position, it is necessary to remove the cover 14.
  • the endless grinding belt 20 can be easily replaced by setting the pulley support bar 12 in the tension release position by the locking member 34.
  • the endless grinding belt 20 is attached between the drive pulley 16 and the idle pulley 18 and the locking member 34 is pushed in, the locking between the locking projection 34e and the locking groove 12e is released, and the pulley support bar 12 Is displaced by the urging force of the tension applying spring 30 and returns to the tension applying position shown in FIG. 1 to FIG. 3 to apply tension to the endless grinding belt 20.
  • the locking protrusion 34 e of the locking member 34 is pressed against the outer peripheral surface of the pulley support bar 12 by the locking spring 36.
  • a cover 14 that covers the drive pulley 16 from the side surface is attached for safety.
  • the locking member 34 is pressed by the pressing protrusion 14a.
  • the locking member 34 is pushed by the pressing protrusion 14a of the cover 14 and is forcibly displaced to the locking release position.
  • the locking protrusion 34 e of the locking member 34 is positioned slightly away from the outer peripheral surface of the pulley support bar 12.
  • An annular seal member 38 is attached between the locking member 34 and the tool body 10 as described above, and the gap between the locking member 34 and the tool body 10 is closed by the seal member 38. It is. This prevents foreign matter such as grinding powder and dust from entering the tool body 10 through the gap.
  • the seal member 38 has a structure having an inner peripheral portion 38a, an outer peripheral portion 38b, and a flexible portion 38c. Even if the locking member 34 is displaced between the locking position and the locking release position. Since the contact state between the inner peripheral part 38a and the locking member 34 and the contact state between the outer peripheral part 38b and the tool body 10 are maintained, the locking position and the locking release position of the locking member 34 are maintained. Regardless of the displacement between them, it is possible to always prevent the intrusion of foreign matter.
  • the locking member 34, the locking member accommodation hole 33, and the seal member 38 are all formed to have a circular shape as a whole, it is easy to maintain a close contact state. Even if rattling occurs, it is difficult to form a gap with the seal member 38. Further, since there is no corner in the portion that contacts the seal member 38, stress concentration is unlikely to occur in the seal member 38. Further, since the cylindrical locking member 34 is held by the locking member receiving hole 33 having a circular cross section, the locking member 34 has a locking member 34 as compared with a conventional plate-shaped locking member. It becomes easy to reduce the shakiness in the accommodation hole 33.
  • the locking member 34, the locking member accommodation hole 33, and the seal member 38 are all formed in a circular shape, so that the space between the locking member 34 and the tool body 10 is set. It is possible to more reliably close the gap.
  • an air motor is used as a drive source of the drive pulley, but this may be an electric motor.
  • Belt grinding tool 1 tool body 10; rear end 10a; outer surface 10b; pulley support bar 12; front end 12a; rear end 12b; spring accommodating hole 12c; Drive pulley 16; Idle pulley 18; Air motor 19; Drive shaft 19a; Endless grinding belt 20; Operation lever 22; Air supply port 24; Air supply path 26; Adjustment mechanism 28; Spring 30; Bolt 32; Locking member receiving hole 33; Expanded portion 33a; Bottom surface 33b; Inner peripheral surface 33c; Locking member 34; Outer peripheral surface 34a; Seal member holding groove 34b; Locking protrusion 34e; Locking spring 36; Seal member 38; Inner peripheral part 38a; Outer peripheral part 38b; Flexible part 38c; Longitudinal axis L; central axis M

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)

Abstract

Provided is a belt-type grinding tool in which foreign matter is prevented from entering the interior of a tool body. A pulley support bar (12) is held by a bar containment hole (29) in the tool body (10) so as to be capable of sliding between a tension imparting position at which tension is applied to an endless grinding belt (20) and a tension release position at which the pulley support lever (12) is retracted from the tension imparting position and the tension on the endless grinding belt is released. A latching member containment hole (33), which has a circular cross-section and which is substantially orthogonal to the bar containment hole (29), is formed in the tool body (10), and a substantially cylindrical latching member (34) is slidably positioned in the latching member containment hole (33). The latching member (34) is capable of being displaced between a latching position at which the pulley support bar (12) is latched so as to be held in the tension release position, and an unlatching position at which the pulley support bar (12) is unlatched and can be displaced between the tension imparting position and the tension release position. An annular seal member (38) is positioned between the outer peripheral surface (34a) of the latching member (34) and the inner peripheral surface (33c) of the latching member containment hole (33).

Description

ベルト式研削工具Belt grinding tool

　本発明は、ベルト式研削工具に関し、より詳細には、無端研削ベルトの交換の際にプーリ支持バーを後退した位置に保持するための構造を備えたベルト式研削工具に関する。 The present invention relates to a belt-type grinding tool, and more particularly, to a belt-type grinding tool having a structure for holding a pulley support bar in a retracted position when replacing an endless grinding belt.

　ベルト式研削工具は、モータにより回転駆動されるドライブプーリと、回転自在なアイドルプーリと、これらドライブプーリとアイドルプーリとの間に掛け回される無端研削ベルトと、を備え、ドライブプーリの回転に伴って回転駆動される無端研削ベルトを対象物に当接させることにより該対象物の研削を行うようにした研削工具である。アイドルプーリを支持するプーリ支持バーは、ドライブプーリが設けられた工具本体に前後方向で摺動可能に保持され、工具本体内に設けられたスプリングにより前方に付勢される。このスプリングの付勢力によってアイドルプーリが無端研削ベルトの内周面に押し付けられることにより、ドライブプーリとアイドルプーリとに掛け回された無端研削ベルトに適度な張力を付与するようになっている。 A belt-type grinding tool includes a drive pulley that is driven to rotate by a motor, a rotatable idle pulley, and an endless grinding belt that is wound between the drive pulley and the idle pulley, and is used to rotate the drive pulley. A grinding tool that grinds an object by bringing an endless grinding belt that is rotationally driven into contact with the object. A pulley support bar that supports the idle pulley is slidably held in a front-rear direction on a tool body provided with a drive pulley, and is urged forward by a spring provided in the tool body. When the idle pulley is pressed against the inner peripheral surface of the endless grinding belt by the urging force of the spring, an appropriate tension is applied to the endless grinding belt wound around the drive pulley and the idle pulley.

　無端研削ベルトはある程度使用をすると交換する必要が生じるが、交換のためには、無端研削ベルトに付与されている張力を解放するためにプーリ支持バーをスプリングの付勢力に抗して後方に押圧し、その状態を維持しなければならない。そのため、通常は、プーリ支持バーを後退した位置に保持しておくための係止構造が設けられる。例えば特許文献１においては、プーリ支持バーを摺動保持する内部空間に連通する開口を工具本体に形成し、この開口にＬ字状の係止部材（プッシュボタン）を配置して、係止部材をプーリ支持バーに係止することによりプーリ支持バーを後退した位置に保持するようにしている。 The endless grinding belt needs to be replaced after a certain amount of use, but to replace it, the pulley support bar is pushed backward against the biasing force of the spring to release the tension applied to the endless grinding belt. And that state must be maintained. Therefore, normally, a locking structure for holding the pulley support bar in the retracted position is provided. For example, in Patent Document 1, an opening communicating with an internal space for slidingly holding a pulley support bar is formed in a tool body, and an L-shaped locking member (push button) is disposed in the opening, and the locking member The pulley support bar is held in the retracted position by engaging the pulley support bar.

特許第３７１１０９５号公報Japanese Patent No. 3711095

　しかしながら、このような係止部材は工具本体に対して可動となっているため、工具本体とプッシュボタンとの間には隙間が生じることになる。そうすると、この隙間から研削粉や埃などの異物が工具本体の内部に進入してしまうことがある。このような異物が、例えばプーリ支持バーと工具本体との間の摺動部に入り込むと、プーリ支持バーの変位が妨げられて、無端研削ベルトに適切な張力を付与できなくなるなどの不具合が生じてしまう。 However, since such a locking member is movable with respect to the tool body, a gap is generated between the tool body and the push button. If it does so, foreign materials, such as grinding powder and dust, may enter the inside of a tool main part from this crevice. If such foreign matter enters, for example, the sliding portion between the pulley support bar and the tool body, displacement of the pulley support bar is hindered, causing problems such as being unable to apply appropriate tension to the endless grinding belt. End up.

　そこで本発明は、上記従来技術の問題点に鑑みて、プーリ支持バーを係止する係止部材と工具本体との間の隙間から工具本体内部への異物の侵入を防止するようにしたベルト式研削工具を提供することを目的とする。 Accordingly, in view of the problems of the prior art described above, the present invention is a belt type that prevents foreign matter from entering into the tool body from the gap between the locking member that locks the pulley support bar and the tool body. An object is to provide a grinding tool.

　すなわち本発明は、
　前端部から後端部にまで長手軸線の方向に延在し、該前端部に回転自在に取り付けられたアイドルプーリを有するプーリ支持バーと、
　モータにより回転駆動されるドライブプーリが設けられ、該プーリ支持バーの該後端部を受け入れるバー収容孔、及び該バー収容孔に略直交する断面円形の係止部材収容孔を有する工具本体であって、該プーリ支持バーを、該アイドルプーリと該ドライブプーリとの間に掛け回される無端研削ベルトに張力を加える張力付与位置と、該張力付与位置から後退して該無端研削ベルトの張力を解放する張力解放位置との間で該長手軸線の方向で摺動可能に保持する工具本体と、
　該プーリ支持バーと該工具本体との間に設定され、該プーリ支持バーを該張力付与位置に向かって付勢する張力付与スプリングと、
　該係止部材収容孔に摺動可能に配置された略円柱状の係止部材であって、該係止部材収容孔内において、該張力解放位置にある該プーリ支持バーを係止して該プーリ支持バーを該張力解放位置に保持する係止位置と、該係止が解除され該プーリ支持バーが該張力付与位置と該張力解放位置との間で変位可能となる係止解除位置との間で変位可能とされた係止部材と、
　該係止部材の外周面と該係止部材収容孔の内周面との間に配置された円環状のシール部材と、
　を備える、ベルト式研削工具を提供する。 That is, the present invention
A pulley support bar having an idle pulley extending in the direction of the longitudinal axis from the front end portion to the rear end portion and rotatably attached to the front end portion;
A tool body provided with a drive pulley that is rotationally driven by a motor, and having a bar housing hole for receiving the rear end portion of the pulley support bar, and a locking member housing hole having a circular cross section substantially orthogonal to the bar housing hole A tension applying position that applies tension to the endless grinding belt that is wound between the idle pulley and the drive pulley, and a tension applied to the endless grinding belt that is retracted from the tension applying position. A tool body for slidably holding in the direction of the longitudinal axis between the tension release position to be released;
A tension applying spring that is set between the pulley support bar and the tool body and biases the pulley support bar toward the tension applying position;
A substantially cylindrical locking member slidably disposed in the locking member receiving hole, wherein the pulley support bar in the tension release position is locked in the locking member receiving hole to A locking position for holding the pulley support bar at the tension release position, and a lock release position at which the locking is released and the pulley support bar can be displaced between the tension applying position and the tension releasing position. A locking member displaceable between,
An annular seal member disposed between the outer peripheral surface of the locking member and the inner peripheral surface of the locking member accommodation hole;
A belt-type grinding tool is provided.

　当該ベルト式研削工具においては、係止部材の外周面と係止部材収容孔の内周面との間にシール部材が配置されているため、係止部材と工具本体との間の隙間から研削粉や埃などの異物が工具本体内部に侵入することを防止することが可能となる。また、略円柱状の係止部材と断面円形の係止部材保持孔との間を円環状のシール部材により密封する構造となっているので、係止部材と工具本体とに対してシール部材が均一に密着するようになり、その密着状態を維持することが容易となる。またシール部材と接触する部分に角部がないためシール部材への応力集中も起きにくく、シール部材が損傷しにくい。さらには、略円柱状の係止部材が断面円形の係止部材収容孔により保持されるため、従来の板状の係止部材に比べて、係止部材のがたつきを小さくすることが容易となる。これらにより、係止部材と工具本体との間の隙間を塞いだ状態をより確実に維持することができ、工具本体の内部への異物の侵入をより確実に防止することが可能となる。 In the belt type grinding tool, since the seal member is disposed between the outer peripheral surface of the locking member and the inner peripheral surface of the locking member accommodation hole, grinding is performed from the gap between the locking member and the tool body. It is possible to prevent foreign matters such as powder and dust from entering the tool body. In addition, since the gap between the substantially cylindrical locking member and the locking member holding hole having a circular cross section is sealed with an annular sealing member, the sealing member is attached to the locking member and the tool body. It comes to contact | adhere uniformly and it becomes easy to maintain the contact | adherence state. Further, since there are no corners in the portion that contacts the seal member, stress concentration on the seal member is unlikely to occur, and the seal member is not easily damaged. Furthermore, since the substantially cylindrical locking member is held by the locking member receiving hole having a circular cross section, it is easy to reduce rattling of the locking member as compared with the conventional plate-shaped locking member. It becomes. As a result, the state in which the gap between the locking member and the tool body is closed can be more reliably maintained, and the entry of foreign matter into the tool body can be more reliably prevented.

　好ましくは、該シール部材が、該係止部材の該外周面に密着する内周部と、該係止部材保持孔の該内周面に密着する外周部と、該内周部と該外周部とを該シール部材の中心軸線の方向で相対的に変位可能に連結する可撓部と、を有するようにすることができる。 Preferably, the seal member has an inner peripheral portion that is in close contact with the outer peripheral surface of the locking member, an outer peripheral portion that is in close contact with the inner peripheral surface of the locking member holding hole, the inner peripheral portion, and the outer peripheral portion. And a flexible portion that is connected so as to be relatively displaceable in the direction of the central axis of the seal member.

　このような構成により、係止部材が変位したときに、内周部と外周部とがそれぞれ係止部材と工具本体とに追従して変位するようになり、シール部材と係止部材及び工具本体との間の密着状態をより確実に維持することが可能となる。 With such a configuration, when the locking member is displaced, the inner peripheral portion and the outer peripheral portion are displaced following the locking member and the tool main body, respectively, and the seal member, the locking member, and the tool main body are displaced. It becomes possible to maintain the contact | adherence state between these more reliably.

　好ましくは、
　該係止部材が、該外周面に環状のシール部材保持溝を有し、
　該係止部材保持孔が、該工具本体の外側面上で拡径した拡径部を有し、
　該シール部材の該内周部が該シール部材保持溝内に挿入されて保持され、該外周部が該係止部材保持孔の該拡径部に密着して配置されるようにすることができる。 Preferably,
The locking member has an annular seal member holding groove on the outer peripheral surface,
The locking member holding hole has a diameter-expanded portion that is diameter-expanded on the outer surface of the tool body,
The inner peripheral portion of the seal member can be inserted and held in the seal member holding groove, and the outer peripheral portion can be disposed in close contact with the enlarged diameter portion of the locking member holding hole. .

　このような構成により、シール部材と係止部材及び工具本体との間の密着状態をさらに確実に維持することが可能となる。 Such a configuration makes it possible to more reliably maintain the close contact state between the seal member, the locking member, and the tool body.

　好ましくは、
　該プーリ支持バーが該後端部に形成された係止溝を有し、
　該係止部材が該プーリ支持バーの該後端部を通す貫通孔を有し、該貫通孔にその内周面の一部から内側に突出した係止突起が設けられており、
　該プーリ支持バーが該張力解除位置にある状態で該係止部材が該係止位置に変位することにより、該係止部材の該係止突起が該係止溝と係合して該プーリ支持バーを該張力解除位置に保持するようにすることができる。 Preferably,
The pulley support bar has a locking groove formed at the rear end;
The locking member has a through-hole through which the rear end of the pulley support bar passes, and the through-hole is provided with a locking projection protruding inward from a part of the inner peripheral surface thereof;
The locking member is displaced to the locking position while the pulley support bar is in the tension release position, so that the locking projection of the locking member engages with the locking groove and the pulley support The bar can be held in the tension release position.

　さらに好ましくは、該工具本体と該係止部材との間に設定され、該係止部材を該係止位置に向かって付勢する係止スプリングを更に備えるようにすることができる。 More preferably, a locking spring that is set between the tool body and the locking member and biases the locking member toward the locking position can be further provided.

　以下、本発明に係るベルト式研削工具の実施形態を添付図面に基づき説明する。 Hereinafter, an embodiment of a belt grinding tool according to the present invention will be described with reference to the accompanying drawings.

本発明の一実施形態に係るベルト式研削工具の、プーリ支持バーが張力付与位置にあるときの側面図である。It is a side view when the pulley support bar exists in a tension | tensile_strength provision position of the belt type grinding tool which concerns on one Embodiment of this invention. 図１のベルト式研削工具のカバーを外した状態の側面図である。It is a side view of the state which removed the cover of the belt type grinding tool of FIG. 図１のIII－III線における上面断面図である。FIG. 3 is a top sectional view taken along line III-III in FIG. 1. 図１のIV－IV線における前面断面図である。FIG. 4 is a front sectional view taken along line IV-IV in FIG. 1. 図３のベルト式研削工具の係止部材周辺の拡大図である。FIG. 4 is an enlarged view around a locking member of the belt-type grinding tool of FIG. 3. 係止部材の前面図である。It is a front view of a locking member. シール部材の断面図である。It is sectional drawing of a sealing member. 図２のベルト式研削工具の、プーリ支持バーが張力解除位置にあるときの側面図である。FIG. 3 is a side view of the belt-type grinding tool of FIG. 2 when a pulley support bar is in a tension release position. 図８のIX－IX線における上面断面図である。FIG. 9 is a top sectional view taken along line IX-IX in FIG. 8.

　本発明の実施形態に係るベルト式研削工具１は、図１及び図２に示すように、工具本体１０と、工具本体１０に保持されたプーリ支持バー１２と、工具本体１０に取り付けられたカバー１４と、カバー１４の内側において工具本体１０に取り付けられたドライブプーリ１６と、プーリ支持バー１２の前端部１２ａにおいて回転自在に取り付けられたアイドルプーリ１８とを備える。ドライブプーリ１６は、図３に示すように、工具本体１０内に配置されたエアモータ１９の駆動軸１９ａに固定され、エアモータ１９により回転駆動される。ドライブプーリ１６とアイドルプーリ１８との間には、無端研削ベルト２０が掛け回されている。工具本体１０に枢動可能に設けられた操作レバー２２を操作することにより、工具本体１０の後端部１０ａにある空気供給口２４から供給される圧縮空気が空気供給路２６を通ってエアモータ１９に導入され、この圧縮空気によってエアモータ１９が回転駆動されることにより、無端研削ベルト２０はドライブプーリ１６を介して回転駆動される。 As shown in FIGS. 1 and 2, the belt-type grinding tool 1 according to the embodiment of the present invention includes a tool body 10, a pulley support bar 12 held by the tool body 10, and a cover attached to the tool body 10. 14, a drive pulley 16 attached to the tool body 10 inside the cover 14, and an idle pulley 18 attached rotatably at the front end 12 a of the pulley support bar 12. As shown in FIG. 3, the drive pulley 16 is fixed to a drive shaft 19 a of an air motor 19 disposed in the tool body 10 and is driven to rotate by the air motor 19. An endless grinding belt 20 is wound between the drive pulley 16 and the idle pulley 18. By operating an operating lever 22 provided on the tool body 10 so as to be pivotable, compressed air supplied from an air supply port 24 at the rear end 10a of the tool body 10 passes through an air supply path 26 and is supplied to an air motor 19. The endless grinding belt 20 is rotationally driven via the drive pulley 16 by the air motor 19 being rotationally driven by the compressed air.

　プーリ支持バー１２は、図３に示すように、アイドルプーリ１８を回転自在に保持する前端部１２ａから工具本体１０内に収容された後端部１２ｂにまで長手軸線Ｌの方向に延在する。前端部１２ａには、長手軸線Ｌに対するアイドルプーリ１８の角度を微調整するための調節機構２８が設けられている。後端部１２ｂは、円柱形状を有し、工具本体１０に設けられたバー収容孔２９に対して長手軸線Ｌの方向で摺動可能に保持される。後端部１２ｂには、後端から前方に向かって延在するスプリング収容孔１２ｃが形成されていて、このスプリング収容孔１２ｃ内には張力付与スプリング３０が配置されている。この張力付与スプリング３０により、プーリ支持バー１２は工具本体１０に対して前方（図で見て左方）に付勢される。図１乃至図３に示す状態においては、アイドルプーリ１８が張力付与スプリング３０の付勢力により無端研削ベルト２０の内周面に押しつけられて、無端研削ベルト２０に張力を付与する。プーリ支持バー１２の後端部１２ｂにはさらに、長手軸線Ｌの方向に延在する長穴１２ｄが形成されており、図４から分かるように、工具本体１０に取り付けられたボルト３２の先端がこの長穴１２ｄに収容されるようになっている。これにより、プーリ支持バー１２は、工具本体１０に対して、長手軸線Ｌの方向での変位可能な位置が長穴１２ｄの長手軸線Ｌの方向での長さにより制限されるとともに、長手軸線Ｌの周りでの回転が阻止される。 As shown in FIG. 3, the pulley support bar 12 extends in the direction of the longitudinal axis L from a front end portion 12 a that rotatably holds the idle pulley 18 to a rear end portion 12 b that is accommodated in the tool body 10. The front end portion 12a is provided with an adjusting mechanism 28 for finely adjusting the angle of the idle pulley 18 with respect to the longitudinal axis L. The rear end portion 12b has a cylindrical shape, and is held so as to be slidable in the direction of the longitudinal axis L with respect to the bar accommodating hole 29 provided in the tool body 10. A spring accommodating hole 12c extending forward from the rear end is formed in the rear end portion 12b, and a tension applying spring 30 is disposed in the spring accommodating hole 12c. By this tension applying spring 30, the pulley support bar 12 is urged forward (leftward in the drawing) with respect to the tool body 10. In the state shown in FIGS. 1 to 3, the idle pulley 18 is pressed against the inner peripheral surface of the endless grinding belt 20 by the urging force of the tension applying spring 30 to apply tension to the endless grinding belt 20. The rear end portion 12b of the pulley support bar 12 is further formed with a long hole 12d extending in the direction of the longitudinal axis L. As can be seen from FIG. 4, the tip of the bolt 32 attached to the tool body 10 is The elongated hole 12d is accommodated. As a result, the position of the pulley support bar 12 that can be displaced in the direction of the longitudinal axis L with respect to the tool body 10 is limited by the length of the elongated hole 12d in the direction of the longitudinal axis L, and the longitudinal axis L Rotation around is prevented.

　工具本体１０には、図５に詳細に示すように、バー収容孔２９に対して略直交する方向に延在する断面円形の係止部材収容孔３３が形成され、この係止部材収容孔３３の中に略円柱状の係止部材３４が配置されている。係止部材３４は、図６に示すように、その外周面３４ａに形成された環状のシール部材保持溝３４ｂと、中央部を貫通する貫通孔３４ｃと、上部にあるスプリング保持部３４ｄとを有する。貫通孔３４ｃはやや縦長の楕円形状を有し、その内周面の上部中央位置には内側に突出した三日月状の係止突起３４ｅが形成されている。工具本体１０と係止部材３４のスプリング保持部３４ｄとの間には係止スプリング３６が設定されている。係止部材３４は係止スプリング３６によって、側方（図３、図５で見て下方）に付勢される。 As shown in detail in FIG. 5, the tool body 10 is formed with a locking member receiving hole 33 having a circular cross section extending in a direction substantially orthogonal to the bar receiving hole 29, and this locking member receiving hole 33. A substantially cylindrical locking member 34 is disposed in the inside. As shown in FIG. 6, the locking member 34 has an annular seal member holding groove 34 b formed on the outer peripheral surface 34 a, a through hole 34 c that penetrates the center portion, and a spring holding portion 34 d at the top. . The through-hole 34c has a slightly vertically long elliptical shape, and a crescent-shaped locking projection 34e protruding inward is formed at the upper center position of the inner peripheral surface thereof. A locking spring 36 is set between the tool body 10 and the spring holding portion 34 d of the locking member 34. The locking member 34 is biased laterally (downward as viewed in FIGS. 3 and 5) by a locking spring 36.

　係止部材３４と工具本体１０との間には円環状のシール部材３８が取り付けられている。このシール部材３８は、外力を受けていない状態では、図７に示すような形状を有しており、内周部３８ａと、外周部３８ｂと、これら内周部３８ａと外周部３８ｂとをシール部材３８の中心軸線Ｍの方向で相対的に変位可能に連結する湾曲した可撓部３８ｃとからなる。内周部３８ａは、図５に示すように、係止部材３４のシール部材保持溝３４ｂ内に取り付けられて係止部材３４の外周面３４ａに密着した状態となる。工具本体１０の係止部材収容孔３３は工具本体１０の外側面１０ｂ上で拡径した拡径部３３ａを有し、外周部３８ｂはこの拡径部３３ａにおいて係止部材収容孔３３の内周面３３ｃに密着する。より具体的には、外周部３８ｂは拡径部３３ａの底面３３ｂに押しつけられて密着するとともに拡径部３３ａにおける内周面３３ｃとも密着する。図５の状態においては、シール部材３８の内周部３８ａは係止部材３４とともに工具本体１０の内部に引き込まれているが、外周部３８ｂは係止部材収容孔３３の拡径部３３ａに係止されてその位置が維持されている。 An annular seal member 38 is attached between the locking member 34 and the tool body 10. The seal member 38 has a shape as shown in FIG. 7 in a state where no external force is applied, and seals the inner peripheral portion 38a, the outer peripheral portion 38b, and the inner peripheral portion 38a and the outer peripheral portion 38b. It consists of the curved flexible part 38c connected so that it can displace relatively in the direction of the central axis M of the member 38. As shown in FIG. 5, the inner peripheral portion 38 a is attached in the seal member holding groove 34 b of the locking member 34 and is in close contact with the outer peripheral surface 34 a of the locking member 34. The locking member accommodation hole 33 of the tool body 10 has an enlarged diameter portion 33a whose diameter is enlarged on the outer surface 10b of the tool body 10, and the outer peripheral portion 38b is an inner periphery of the locking member accommodation hole 33 in the enlarged diameter portion 33a. It is in close contact with the surface 33c. More specifically, the outer peripheral portion 38b is pressed against and closely contacts the bottom surface 33b of the enlarged diameter portion 33a and also closely contacts the inner peripheral surface 33c of the enlarged diameter portion 33a. In the state of FIG. 5, the inner peripheral portion 38 a of the seal member 38 is drawn into the tool body 10 together with the locking member 34, but the outer peripheral portion 38 b is engaged with the enlarged diameter portion 33 a of the locking member accommodation hole 33. It is stopped and its position is maintained.

　図１乃至図３の状態においては、プーリ支持バー１２は張力付与スプリング３０により前方に付勢され、無端研削ベルト２０に張力を加えている張力付与位置にあり、また係止部材３４はプーリ支持バー１２の長手軸線Ｌの方向での変位を許容する係止解除位置にある。カバー１４を外した状態でプーリ支持バー１２を後方（図で見て右方）に向かって張力付与スプリング３０の付勢力に抗して押し込み、プーリ支持バー１２の後端部１２ｂに設けられた係止溝１２ｅが係止部材３４の係止突起３４ｅと整合する位置にまで変位させると、図９に示すように、係止部材３４は係止スプリング３６の付勢力により図で見て下方に変位して、係止突起３４ｅが係止溝１２ｅと係合する係止位置となる。このようにして係合部材３４の係止突起３４ｅが係止溝１２ｅと係合することにより、プーリ支持バー１２は張力解除位置に保持される。このときアイドルプーリ１８とドライブプーリ１６との間の距離は近づいていて、無端研削ベルト２０に張力を付与しない状態となる。シール部材３８の内周部３８ａは係止部材３４とともに工具本体１０の外方にやや押し出されるが、外周部３８ｂは依然として係止部材収容孔３３の拡径部３３ａに密着した状態を維持している。なお、取り付けねじ４２により工具本体１０に取り付けられるカバー１４は、係止部材３４と整合する位置において係止部材３４の側に突出する押圧突部１４ａ（図５）を有しており、カバー１４が取り付けられている状態においては、係止部材３４はこの押圧突起１４ａにより係止位置に変位することを阻止されるため、プーリ支持バー１２は係止部材３４によって張力解除位置に保持されない。したがって、プーリ支持バー１２を張力解除位置に係止するためには、カバー１４を外しておく必要がある。 1 to 3, the pulley support bar 12 is biased forward by a tension applying spring 30 and is in a tension applying position where tension is applied to the endless grinding belt 20, and the locking member 34 is supported by the pulley. The bar 12 is in the unlocking position allowing displacement in the direction of the longitudinal axis L. With the cover 14 removed, the pulley support bar 12 was pushed backward (to the right in the figure) against the urging force of the tension applying spring 30 and provided at the rear end portion 12 b of the pulley support bar 12. When the locking groove 12e is displaced to a position where it is aligned with the locking projection 34e of the locking member 34, the locking member 34 is moved downward as viewed in the figure by the urging force of the locking spring 36, as shown in FIG. By being displaced, the locking projection 34e becomes a locking position where it engages with the locking groove 12e. In this way, when the locking protrusion 34e of the engaging member 34 is engaged with the locking groove 12e, the pulley support bar 12 is held at the tension release position. At this time, the distance between the idle pulley 18 and the drive pulley 16 is approaching, and no tension is applied to the endless grinding belt 20. The inner peripheral portion 38 a of the seal member 38 is slightly pushed out of the tool body 10 together with the locking member 34, but the outer peripheral portion 38 b is still maintained in close contact with the enlarged diameter portion 33 a of the locking member accommodation hole 33. Yes. Note that the cover 14 attached to the tool body 10 with the attachment screw 42 has a pressing protrusion 14 a (FIG. 5) that protrudes toward the locking member 34 at a position aligned with the locking member 34. In the state where is attached, the locking member 34 is prevented from being displaced to the locking position by the pressing projection 14 a, so the pulley support bar 12 is not held in the tension releasing position by the locking member 34. Therefore, in order to lock the pulley support bar 12 at the tension release position, it is necessary to remove the cover 14.

　図８及び図９のように係止部材３４によってプーリ支持バー１２が張力解除位置に維持された状態とすることにより、無端研削ベルト２０の交換を容易に行うことができる。無端研削ベルト２０をドライブプーリ１６とアイドルプーリ１８との間に取り付けて係止部材３４を押し込むと、係止突起３４ｅと係止溝１２ｅとの間の係止が解除されて、プーリ支持バー１２は張力付与スプリング３０の付勢力により変位して、図１乃至図３に示す張力付与位置に再び戻り、無端研削ベルト２０に張力を付与した状態となる。このとき係止部材３４の係止突起３４ｅは、係止スプリング３６によってプーリ支持バー１２の外周面に押し付けられた状態となっている。 8 and 9, the endless grinding belt 20 can be easily replaced by setting the pulley support bar 12 in the tension release position by the locking member 34. When the endless grinding belt 20 is attached between the drive pulley 16 and the idle pulley 18 and the locking member 34 is pushed in, the locking between the locking projection 34e and the locking groove 12e is released, and the pulley support bar 12 Is displaced by the urging force of the tension applying spring 30 and returns to the tension applying position shown in FIG. 1 to FIG. 3 to apply tension to the endless grinding belt 20. At this time, the locking protrusion 34 e of the locking member 34 is pressed against the outer peripheral surface of the pulley support bar 12 by the locking spring 36.

　当該ベルト式研削工具１を使用する際には、安全のために、ドライブプーリ１６を側面から覆うカバー１４を取り付ける。カバー１４を工具本体１０に取り付けると、係止部材３４は押圧突部１４ａにより押圧される。これにより、仮にカバー１４取り付け時に係止部材３４が係止位置にあった場合には、係止部材３４はカバー１４の押圧突部１４ａに押されて強制的に係止解除位置に変位される。また、係止部材３４の係止突起３４ｅは、図５に示すように、プーリ支持バー１２の外周面から僅かに離れた位置となる。 When using the belt grinding tool 1, a cover 14 that covers the drive pulley 16 from the side surface is attached for safety. When the cover 14 is attached to the tool main body 10, the locking member 34 is pressed by the pressing protrusion 14a. Thus, if the locking member 34 is in the locking position when the cover 14 is attached, the locking member 34 is pushed by the pressing protrusion 14a of the cover 14 and is forcibly displaced to the locking release position. . Further, as shown in FIG. 5, the locking protrusion 34 e of the locking member 34 is positioned slightly away from the outer peripheral surface of the pulley support bar 12.

　係止部材３４と工具本体１０の間には、上述のように円環状のシール部材３８が取り付けられており、このシール部材３８により係止部材３４と工具本体１０との間の隙間が塞がれる。これにより、この隙間を介して研削粉や埃などの異物が工具本体１０の内部に侵入することが防止される。また、シール部材３８は、内周部３８ａと外周部３８ｂと可撓部３８ｃとを有する構造とされており、係止部材３４が係止位置と係止解除位置との間で変位しても内周部３８ａと係止部材３４との密着状態及び外周部３８ｂと工具本体１０との密着状態が維持されるようになっているため、係止部材３４の係止位置と係止解除位置との間の変位にかかわらず、異物の侵入を常に防ぐことが可能となっている。さらに、係止部材３４、係止部材収容孔３３、及びシール部材３８がともに全体として円形の形状を有するようにされているため、密着状態を維持することが容易となり、例えば係止部材３４にがたつきが生じたとしてもシール部材３８との間に隙間が形成されにくい。またシール部材３８と接触する部分に角部がないためシール部材３８に応力集中が起こりにくい。さらに、円柱状の係止部材３４は断面円形の係止部材収容孔３３により保持されるようになっているため、従来の板状の係止部材に比べて、係止部材３４の係止部材収容孔３３内でのがたつきを小さくすることが容易となる。このように、当該ベルト式研削工具１においては、係止部材３４、係止部材収容孔３３、及びシール部材３８をともに円形の形状とすることにより、係止部材３４と工具本体１０との間の隙間をより確実に塞ぐことが可能となっている。 An annular seal member 38 is attached between the locking member 34 and the tool body 10 as described above, and the gap between the locking member 34 and the tool body 10 is closed by the seal member 38. It is. This prevents foreign matter such as grinding powder and dust from entering the tool body 10 through the gap. Further, the seal member 38 has a structure having an inner peripheral portion 38a, an outer peripheral portion 38b, and a flexible portion 38c. Even if the locking member 34 is displaced between the locking position and the locking release position. Since the contact state between the inner peripheral part 38a and the locking member 34 and the contact state between the outer peripheral part 38b and the tool body 10 are maintained, the locking position and the locking release position of the locking member 34 are maintained. Regardless of the displacement between them, it is possible to always prevent the intrusion of foreign matter. Further, since the locking member 34, the locking member accommodation hole 33, and the seal member 38 are all formed to have a circular shape as a whole, it is easy to maintain a close contact state. Even if rattling occurs, it is difficult to form a gap with the seal member 38. Further, since there is no corner in the portion that contacts the seal member 38, stress concentration is unlikely to occur in the seal member 38. Further, since the cylindrical locking member 34 is held by the locking member receiving hole 33 having a circular cross section, the locking member 34 has a locking member 34 as compared with a conventional plate-shaped locking member. It becomes easy to reduce the shakiness in the accommodation hole 33. As described above, in the belt-type grinding tool 1, the locking member 34, the locking member accommodation hole 33, and the seal member 38 are all formed in a circular shape, so that the space between the locking member 34 and the tool body 10 is set. It is possible to more reliably close the gap.

　なお、上記実施形態においては、ドライブプーリの駆動源としてエアモータを使用しているが、これを電動モータとすることもできる。 In the above embodiment, an air motor is used as a drive source of the drive pulley, but this may be an electric motor.

ベルト式研削工具１；工具本体１０；後端部１０ａ；外側面１０ｂ；プーリ支持バー１２；前端部１２ａ；後端部１２ｂ；スプリング収容孔１２ｃ；長穴１２ｄ；係止溝１２ｅ；カバー１４；押圧突部１４ａ；ドライブプーリ１６；アイドルプーリ１８；エアモータ１９；駆動軸１９ａ；無端研削ベルト２０；操作レバー２２；空気供給口２４；空気供給路２６；調節機構２８；バー収容孔２９；張力付与スプリング３０；ボルト３２；係止部材収容孔３３；拡径部３３ａ；底面３３ｂ；内周面３３ｃ；係止部材３４；外周面３４ａ；シール部材保持溝３４ｂ；貫通孔３４ｃ；スプリング保持部３４ｄ；係止突起３４ｅ；係止スプリング３６；シール部材３８；内周部３８ａ；外周部３８ｂ；可撓部３８ｃ；取り付けねじ４２；
長手軸線Ｌ；中心軸線Ｍ Belt grinding tool 1; tool body 10; rear end 10a; outer surface 10b; pulley support bar 12; front end 12a; rear end 12b; spring accommodating hole 12c; Drive pulley 16; Idle pulley 18; Air motor 19; Drive shaft 19a; Endless grinding belt 20; Operation lever 22; Air supply port 24; Air supply path 26; Adjustment mechanism 28; Spring 30; Bolt 32; Locking member receiving hole 33; Expanded portion 33a; Bottom surface 33b; Inner peripheral surface 33c; Locking member 34; Outer peripheral surface 34a; Seal member holding groove 34b; Locking protrusion 34e; Locking spring 36; Seal member 38; Inner peripheral part 38a; Outer peripheral part 38b; Flexible part 38c;
Longitudinal axis L; central axis M

Claims (5)

　前端部から後端部にまで延在し、該前端部に回転自在に取り付けられたアイドルプーリを有するプーリ支持バーと、
　モータにより回転駆動されるドライブプーリが設けられ、該プーリ支持バーの該後端部を受け入れるバー収容孔、及び該バー収容孔に略直交する断面円形の係止部材収容孔を有する工具本体であって、該プーリ支持バーを、該アイドルプーリと該ドライブプーリとの間に掛け回される無端研削ベルトに張力を加える張力付与位置と、該張力付与位置から後退して該無端研削ベルトの張力を解放する張力解放位置との間で、該プーリ支持バーの長手軸線の方向で摺動可能に保持する工具本体と、
　該プーリ支持バーと該工具本体との間に設定され、該プーリ支持バーを該張力付与位置に向かって付勢する張力付与スプリングと、
　該係止部材収容孔に摺動可能に配置された略円柱状の係止部材であって、該係止部材収容孔内において、該張力解放位置にある該プーリ支持バーを係止して該プーリ支持バーを該張力解放位置に保持する係止位置と、該係止が解除され該プーリ支持バーが該張力付与位置と該張力解放位置との間で変位可能となる係止解除位置との間で変位可能とされた係止部材と、
　該係止部材の外周面と該係止部材収容孔の内周面との間に配置された円環状のシール部材と、
　を備える、ベルト式研削工具。 A pulley support bar having an idle pulley extending from the front end portion to the rear end portion and rotatably attached to the front end portion;
A tool body provided with a drive pulley that is rotationally driven by a motor, and having a bar housing hole for receiving the rear end portion of the pulley support bar, and a locking member housing hole having a circular cross section substantially orthogonal to the bar housing hole A tension applying position that applies tension to the endless grinding belt that is wound between the idle pulley and the drive pulley, and a tension applied to the endless grinding belt that is retracted from the tension applying position. A tool body that is slidably held in the direction of the longitudinal axis of the pulley support bar between the tension release position to be released; and
A tension applying spring that is set between the pulley support bar and the tool body and biases the pulley support bar toward the tension applying position;
A substantially cylindrical locking member slidably disposed in the locking member receiving hole, wherein the pulley support bar in the tension release position is locked in the locking member receiving hole to A locking position for holding the pulley support bar at the tension release position, and a lock release position at which the locking is released and the pulley support bar can be displaced between the tension applying position and the tension releasing position. A locking member displaceable between,
An annular seal member disposed between the outer peripheral surface of the locking member and the inner peripheral surface of the locking member accommodation hole;
A belt grinding tool. 　該シール部材が、該係止部材の該外周面に密着する内周部と、該係止部材保持孔の該内周面に密着する外周部と、該内周部と該外周部とを該シール部材の中心軸線の方向で相対的に変位可能に連結する可撓部と、を有する、請求項１に記載のベルト式研削工具。 The sealing member includes an inner peripheral portion that is in close contact with the outer peripheral surface of the locking member, an outer peripheral portion that is in close contact with the inner peripheral surface of the locking member holding hole, and the inner peripheral portion and the outer peripheral portion. The belt-type grinding tool according to claim 1, further comprising a flexible portion that is connected so as to be relatively displaceable in the direction of the central axis of the seal member. 　該係止部材が、該外周面に環状のシール部材保持溝を有し、
　該係止部材保持孔が、該工具本体の外側面上で拡径した拡径部を有し、
　該シール部材の該内周部が該シール部材保持溝内に挿入されて保持され、該外周部が該係止部材保持孔の該拡径部に密着して配置されるようにされた、請求項２に記載のベルト式研削工具。 The locking member has an annular seal member holding groove on the outer peripheral surface,
The locking member holding hole has a diameter-expanded portion that is diameter-expanded on the outer surface of the tool body,
The inner peripheral portion of the seal member is inserted and held in the seal member holding groove, and the outer peripheral portion is arranged in close contact with the enlarged diameter portion of the locking member holding hole. Item 3. A belt-type grinding tool according to Item 2. 　該プーリ支持バーが該後端部に形成された係止溝を有し、
　該係止部材が該プーリ支持バーの該後端部を通す貫通孔を有し、該貫通孔にその内周面の一部から内側に突出した係止突起が設けられており、
　該プーリ支持バーが該張力解除位置にある状態で該係止部材が該係止位置に変位することにより、該係止部材の該係止突起が該係止溝と係合して該プーリ支持バーを該張力解除位置に保持するようにされた、請求項１乃至３のいずれか一項に記載のベルト式研削工具。 The pulley support bar has a locking groove formed at the rear end;
The locking member has a through-hole through which the rear end of the pulley support bar passes, and the through-hole is provided with a locking projection protruding inward from a part of the inner peripheral surface thereof;
The locking member is displaced to the locking position while the pulley support bar is in the tension release position, so that the locking projection of the locking member engages with the locking groove and the pulley support The belt-type grinding tool according to any one of claims 1 to 3, wherein the bar is held in the tension release position. 　該工具本体と該係止部材との間に設定され、該係止部材を該係止位置に向かって付勢する係止スプリングを更に備える、請求項１乃至４のいずれか一項に記載のベルト式研削工具。
  5. The locking spring according to claim 1, further comprising a locking spring that is set between the tool body and the locking member and biases the locking member toward the locking position. 6. Belt grinding tool.
PCT/JP2017/009776 2016-03-11 2017-03-10 Belt-type grinding tool Ceased WO2017155108A1 (en)

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CN201780015190.6A CN108778622B (en) 2016-03-11 2017-03-10 Belt Grinding Tool
GB1813611.9A GB2562440B (en) 2016-03-11 2017-03-10 Belt-type grinding tool
KR1020187025676A KR102116228B1 (en) 2016-03-11 2017-03-10 Belt grinding tool
JP2018504617A JP6516920B2 (en) 2016-03-11 2017-03-10 Belt type grinding tool
DE112017001275.9T DE112017001275B4 (en) 2016-03-11 2017-03-10 Belt sanding tool

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GB2562440B (en) 2021-02-24
KR102116228B1 (en) 2020-05-28
CN108778622A (en) 2018-11-09
TW201736038A (en) 2017-10-16
TWI617390B (en) 2018-03-11
GB201813611D0 (en) 2018-10-03
DE112017001275B4 (en) 2024-07-11
KR20180108798A (en) 2018-10-04

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