JPH081768Y2 - Free cone - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION This invention relates to a large-diameter hole in a plate material such as metal, light metal, plastic, and wood, and a free cone for obtaining a large-diameter disk from the plate material.

[0002]

2. Description of the Related Art A conventional free cone is as shown in FIGS. 6 and 7, in which a supporting rod 2 for supporting a cutting blade 3 is made of a plate-shaped steel plate, and the supporting rod 2 has its longitudinal direction. A long hole 8 is provided in the plate surface in the direction, and the bolt 5 of the cutting blade 3 is inserted into the long hole 8 from below the support rod 2, and the nut 7 is doubly engaged from above. There is one in which the cutting blade body 3 is attached to the support rod 2. In addition, there is also one in which the cutting blade 3 is loosely fitted to the rod-shaped supporting rod 2 and the set screw of the body is pressed against the supporting rod 2 to fix the cutting blade 3 to the supporting rod 2.

[0003]

In the conventional free cone described above, the supporting rod 2 for supporting the cutting blade 3 is made of a plate-shaped steel plate, so that the workpiece is cut in order to enhance the drilling ability. cutting blade and pressing strongly blade 3 support rod 2 is bent What cambered 3 strong from where the blade portion 3 ₁ of the trajectory is changed perforated or templating becomes Ha shape can not be as given It has a low processing capacity that does not allow drilling operation.
There is also one in which the supporting rod 2 is made of steel bar that is difficult to bend. Further, as for the engagement of the cutting blade 3 with the support rod 2, since the plate-like support rod 2 is simply a nut fixing method, the engagement is inaccurate, the nut 7 is easily loosened from the bolt 5, and the rod-shaped support rod is also attached. The engagement with 2 is also such that the engagement of the cutting blade with the support rod is fixed by screwing the stop bolt, so that the engagement also lacks certainty. And these things require tools, such as a driver and a spanner, when fixing a cutting blade to a support rod.

The present invention solves the above problems and makes the supporting rod 2 strong, and the cutting blade 3 can be accurately and surely attached to the supporting rod 2, and the cutting blade to the supporting rod 2 can be fixed. Three
It is an object of the present invention to provide a nut 7 or a fastening bolt for fastening the device that can be operated only by hand without using a tool.

[0005]

In order to solve the above-mentioned problems, the present invention cuts into a body rod ₁₁ of a main shaft ₁ on a support rod 2 which projects in opposite directions intersecting the axial direction of the main shaft. in those providing the blade 3 slidably, with erected bolts 5 upward on the upper surface portion 3 ₃ of the body portion 3 _2, nearest to the support rod 2 of the upper surface portion 3 ₃ of the body portion 3 ₂ loosely combined cutting blade 3 bored the engagement hole 4 to the support rod 2 to the upper portion 3 ₄ of the body 3 ₂ projects upward from the upper surface 2 ₁ of the support rod 2 to be engaged and cutting blade 3 of the body portion 3 ₂ of the upper surface portion 3 ₃ facing the bottom surface portion ₆₁ to the body portion 3 ₂ of the upper portion 3
The presser 6 with through holes 6 ₄ penetrate towards the above the ceiling 6 ₃ of the upper portion 3 deep recess 6 ₂ depths than the projecting length of ₄ and the recess 6 ₂ to engage in _4, the support rod Two
The hole 6 ₄ was loosely fitted engages through the bolt 5 of the cutting blade 3 which is支受bolt 5 protrudes above the support rod 2 of the body portion 3 ₂ protrudes above the presser 6 the recesses 6 in the upper portion 3 ₄ of the body 3 engages the cutting blade 3 to engage with the gap G between the ceiling 6 ₃ of the upper surface portion 3 ₃ a recess 6 of the body portion 3 ₂ which are further engages a freely loosen the nut 7 of the tightening and tightening driven by the drive wheel 7 ₁ to the bolt 5 protruding from the presser 6 and tightened above the presser 6, the lower surface portion ₆₁ of the presser 6 supporting rod 2 to the upper surface portion 2 _1, also the cutting blade 3 respectively to strongly abut from below the support rod 2 to the support rod 2 between the pull toward the support rod 2 by the body of the cutting blade body 3 3 ₂
Is strongly attached to the support rod 2.

[0006]

Since the free cone is used for making a large-diameter circular hole in an object to be cut such as a plate material or for cutting a disk from the plate material, when a desired circular hole or disk is obtained, the spindle 1 and the cutting blade body The support rod 2 supports the cutting blade 3 supported by the support rod 2 at a distance from the support rod 2.
Adjusting to a predetermined length by moving it in the left-right direction and positioning it at a predetermined position fixes the cutting blade 3 on the support rod 2, and then inserts the spindle 1 into a central hole previously drilled with another cone. either to localize a free cone to plate or, a center hole at a predetermined position of the installed shank 1 ₃ of the spindle 1 to drilling machine such as an electric drill motor to rotate the free conical object switching of such sheet bored as free cone during drilling operation by localizing the center drill 1 ₂ shank does not act blindly, cutting blade portion 3 ₁ of the cutting blade 3 free cone to continue then rotating in the object to be cut was When inserted, as the cutting progresses, circular holes can be punched, disks can be formed, and ruled lines can be engraved.
When the plate material is cut with a hand-wound drawing saw, a small hole for inserting a saw is drilled in a part of the ruled drawing line, a drawing cone is inserted into this small hole, and the above ruled drawing line is gently drawn. Accurate circular holes and discs can be formed by cutting.

According to the present invention, the conventional free cone is a means for attaching the cutting blade 3 to the support rod 2 because the locking means of the cutting blade attached to the support rod 2 is easily loosened during use. Is made strong so that the engagement is not loosened inadvertently, and conversely, when it is loosened from the support rod 2 of the cutting blade 3, the tightening can be easily released.

[0008] The details, Figure 1 and the body 3 ₂ engaged loosely by the supporting rod 2 in FIG. 3 to the support rod 2 cutting blade 3 as shown
In the upper part protrudes upwardly from the upper surface 2 ₁ of the trunk portion 3 ₂ of the support rod 2 by支受cutting blade 3 3
_4, FIG. 4 and the recess 6 ₂ deeper recess than the projecting width that protrudes upwardly from the upper surface 2 ₁ of the support rod 2 of the lower surface portion ₆₁ in the recess of depth barrel 3 ₂ as shown in FIG. 5 the recess _{6 2} of the ceiling 6
₃ ceiling bolt 5 of the barrel _{3 2} with recesses _{6 2} fits the presser 6 with holes _{6 4} through the center of the recess _{6 2 6 3}
Through the through-hole 6 ₄ when tightened strongly nut 7 via the engaged driving wheel 7 ₁ nut 7 having a driving handle 7 ₁ to the place that protrudes above the presser 6 to the bolt 5, the nut 7 As the engagement with the bolt 5 becomes deeper, the nut 7 is supported by the presser 6 to draw the cutting blade 3 toward the nut 7. The presser 6 supporting the nut 7 without the contact cutting edge body 3 is strongly lower surface portion ₆₁ on the upper surface 2 ₁ of the support rod 2 loose strongly fixed to the support rod 2, also, the cutting edge The contact area between the body 3 and the support rod 2 is large at the engaging portion, and the presser 6 has the body portion 3 _{2 of the} cutting blade body 3.
While accurate and reliably hold those to strongly fix the barrel 3 ₂ to the supporting rod 2.

When punching a large-diameter circular hole or cutting out a large-diameter circular plate in an object to be cut such as a plate, each cutting blade 3 is cut from the spindle 1.
And 3 are positioned and fixed on the support rod 2 at equal intervals, and furthermore, the blade portions 3 ₁ and 3 _{1 of} each cutting blade body 3 and 3 have
And opposite to each other the bladed surface of one of the blade 3 ₁ blade part 3
Shall face _one of the outer direction, the blade portion 3 ₁ of the opposite side of blade portion 3
_The blade parts 3 ₁ and 3 ₁
Both cutting edges become saw-tooth rows of a saw, and the outward blade cuts from the outer wall surface side of the annular groove formed when cutting the object to the inner wall surface, and the other inward blade from the inner wall surface of the annular groove. The cutting is performed toward the outer wall surface for quick cutting. In this cutting, the cutting blades 3 and 3 are provided on the support rod 2 symmetrically with respect to the spindle 1 from the cutting blade 3
By means of 3 and 3, the main axis 1 stands at right angles to the plate surface, and the cone can be cut straight into the object to be cut without inclination.

In addition to this, when marking lines on the plate surface, one of the cutting blades 3 may be removed from the support rod 2 and only the remaining cutting blade 3 may be marked with an annular marking line. Of course, both cutting blades 3 and 3 may be used.

[0011] blade portion 3 ₁ of the cutting blade 3 to allow the replacement of the blade portion for being placed detachable to the body portion 3 _2, new according to wear and damage of the blade Labs and cutting due ceased cutting blade exchange with, also differs for example iron or wooden plate of material of the perforated material, the attached replacement is facilitated between the blade portion 3 ₁ most suitable for each material by a plastic plate, a housing for further cutting unit 3 ₁ has a small shape Make it easy.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a front view in which one cutting blade body is cut by a free cone of the present invention, and FIG. FIG. 3 is a view of the cone of FIG. 1 taken along the line AA, FIG. 4 is a view of the presser for fixing the cutting blade to the support rod, and FIG. 5 is a view of the line BB of FIG. As seen, Figure 6 shows a conventional free cone,
FIG. 7 is a view of the cone of FIG. 6 viewed from above.

[0013] figure 1 is a spindle which支受the support rod 2, the spindle 1 is the trunk portion 1 ₁ of the shank 1 ₃ The center drill 1 ₂ on the lower side to the upper side is detachable from the body portion 1 ₁ has, furthermore the trunk portion 1 ₁ in which bored square holes through the body portion 1 ₁ in its upper portion.

Reference numeral 2 denotes a supporting rod that supports the cutting blade 3, and this supporting rod 2 is made of a sturdy rectangular steel bar material that withstands a bending moment well, and the supporting rod 2 made of this steel bar has a cross section in the embodiment. is a square, may be the other round cross-section or polygonal cross-section, short long as robust not bent, the shape of the Saido portion 1 ₁ of the engagement hole 4 support rod The shape corresponding to 2 may be used. Then the supporting rods 2 are pressed into the barrel 1 ₁ of square hole of the spindle 1, which is screwed localized symmetric around the trunk portion 1 _1, the support rod 2 is dimensioned scale towards the longitudinal direction 2 ₂ is assigned to indicate the length from the center of the trunk portion 1 _1.

[0015] 3 is a cutting blade which is支受to engage with the support rod 2 supporting rod 2, the cutting blade 3 is quadrangular engaging hole 4 of the support rod 2 to the trunk portion 3 ₂ is loosely fitted if is provided in the vicinity of the trunk portion 3 ₂ of the upper surface portion 3 _3, barrel 3 ₂ of the body portion 3 ₂ when engaged loosely supporting rod 2 with the engaging hole 4 the upper part 3 ₄ supporting rod 2 those projecting from the upper surface 2 ₁ at an upper, also, the body portion 3 ₂ is the upward erected bolts 5 on the upper surface portion 3 _3, Setsujo Ya to be cut comprises the body portion 3 ₂ in opposite the blade portion 3 ₁ subjecting groove at the rear position from the cutting portion of the blade portion 3 ₁ of the cutting edge center drill 1 _2,
It is fixed by positioning it in a position facing it and screwing it in place.

[0016] 6 barrel 3 ₂ of the upper part 3 ₄ and the body 3 ₂ of the upper surface portion 3 ₃ of the cutting blade 3 that protrudes above the support rods 2
The presser 6 is a presser for fixing the cutting blade 3 to the support rod 2 by tightening a nut 7 which is engaged with the bolt 5 erected on the support rod and supported by the bolt 5 between the support rod 2 and the support rod 2. 4 and the upper portion 3 ₄ of the cylindrical cutting blade member 3 as shown in FIG. 5
Bolt 5 in a circular recess _{6 2} and recesses _{6 2} ceiling _{6 3} to fit
Above the but has a through hole 6 ₄ loosely fitting engagement, moreover recesses 6 ₂ and the body 3 ₂ of the upper portion 3 ₄ upper surface portion 3 ₃ a depth of engagement between the recess 6 ₂ supporting rod 2 with Cutting blade 3 protruding to the
Ceiling 6 ₃ and the upper surface such that the body portion 3 ₂ of the upper portion 3 ₄ of the upper surface portion 3 ₃ a ceiling 6 ₃ of the presser 6 when projecting slightly deeper than the length presser 6 is engaged with the upper part 3 ₄ does not abut it is assumed possible tightening of the nut 7 causes maintained an engagement relation as having a gap G between the parts 3 _3.

[0017] The support rod 2 to the left portion and right portion of the support protruding on the left and right sides of the main shaft 1 rod 2 is provided a cutting blade 3 to the trunk portion 3 ₂ of the engaging hole 4 of the cutting blade 3 loosely engaged, respectively towards the above the body portion 3 ₂ and 3 ₂ of the support rod 2 of each cutting blade 3 and 3 with localizing each cutting blade 3 and 3 at a predetermined position of the support rod 2 protruding to have a cylindrical shape each upper portion 3 ₄ loosely engaged recess 6 ₂ into the hole 6 ₄ through the presser 6 bolt 5 is of the trunk portion 3 ₂ of the upper portion 3 ₄ to fit in the recess 6 ₂ ceiling 6 ₃ and an upper portion 3 ₄ of the upper surface portion 3 ₃ upper surface portion of the lower surface portion ₆₁ of the support rod 2 of the presser 6 with a gap G between the 2
It is made to contact with ₁ . By the way, the concave portion 6 _{2 of the} presser foot 6
And the shape of the trunk portion 3 ₂ of the upper part 3 ₄ In Example is circular and cylindrical, upper portion of the other above may be square and square pillar, short presser 6 cutting blade 3 3 ₄ is not limited to examples as long as it can engage in.

Reference numeral 7 denotes a bolt 5 projecting above the presser foot 6.
The nuts pressing the engaging presser 6 to the support rod 2, the nut 7 Yes driving wheel ₇₁ is provided for rotating the nut 7, without using a screwdriver tool such as a spanner by the driving handle 7 ₁ It is possible to easily tighten or loosen the nut 7 easily. Note nut 7 having a driving handle 7 ₁ embodiment but is shaped thumbscrew may be provided with the nut on the other large grip, short nut 7 is operated to allow strongly abut against the retainer 6 The present invention is not limited to the embodiment as long as it is possible.

The cutting blade 3 of the blade portion 3 ₁ each position of the cutting edge bladed surface of the blade portion 3 ₁ of the ones and what the right left support rod 2 facing opposite directions in the embodiment different The left part rotates along the inside of the circle locus, and the right part rotates along the outside of the circle locus to form a groove with a wide width. Only a blade having a blade shape may be used, and the point is not limited to the embodiment as long as the surface of the object to be cut can have a circular cut shape, a concave groove or the like.

[0020]

According to the free cone of the present invention according to claim 1,
Even if a bending moment is applied to the support rod 2 in the course of drilling, the support rod 2 does not bend and warp upward toward the cone, so the cutting blade 3 is strongly pressed against the object to be cut. As a result, the cutting ability of the cutting blade 3 is increased and the drilling speed can be increased.

The cutting blade 3 provided slidably toward the longitudinal direction of the support rod 2 to the support rod 2 is engaging hole 4 as those in the body portion 3 ₂
Contact area because the support rod 2 is fitted loosely with the barrel 3 ₂ and the support rod 2 is the cutting blade 3 becomes large to allow a good engagement without looseness with respect to the support rod 2, the Since the cutting blade 3 does not twist against the support rod 2, the cutting blade 3 is supported by the support rod 2.
You can move smoothly.

[0022] The means for securing the cutting blade 3 to the supporting rod 2 to a predetermined position, the presser 6 which engages the upper portion 3 ₄ of the body portion 3 ₂ which protrudes support rod 2 upwardly on the support rods 2 barrel 3 ₂ to the trunk portion 3 ₂ of the upper portion 3 ₄ to the bolt 5 in the driving handle 7 ₁ by screwed a nut 7 by strongly tightening the nut 7 which is provided is支受even recess 6 ₂ of the presser 6 cutting The blade body 3 is more strongly fixed to the support rod 2, and the body portion 3
When the engagement of the presser 6 and ₂ of upper portion 3 ₄ the upper part 3 ₄ is fitted in the recess 6 _2, between the upper surface portion 3 ₃ a recess 6 ₂ ceiling 6 ₃ of the cutting blade 3 a ceiling 6 ₃ and the body 3 ₂ of the upper surface portion 3 ₃ a recess 6 ₂ even deeper engagement with the upper portion 3 ₄ because as it has a gap G presser 6 and the body portion 3 ₂ support but without interfering with the progress of the presser 6 abuts, the retightening can and become by it can be brought into contact strongly pressing 6 to top portion 2 ₁ of the support rod 2 cutting blade 3 of the nut 7 It can be more firmly fixed to the rod 2.

[0023] By the most recently part of the upper surface portion 3 ₃ position of the trunk portion 3 ₂ of the engaging hole 4 to engage the support rod 2 at the body portion 3 ₂ of the cutting blade 3, the supporting of the body portion 3 ₂ Upper part 3 above the rod 2
Extent which projects upward from the _fourth support rod 2 can be reduced, fastening means to the upper portion 3 ₄ can be lowered bulk of the presser 6 which engages the body portion 3 ₂ of the support rod 2 is small It is possible to improve the visibility of the blade portion 3 ₁ of the body portion 3 ₂ during the drilling work and facilitate the confirmation of the drilled state.

If the cutting blade 3 is provided on the support rod 2 projecting to the left and right sides of the spindle 1 at an equal distance from the axis of the spindle 1, a large-diameter circular hole may be punched in an object to be cut such as a plate. In addition to being able to cut out a large-diameter disk, a ring can be formed by changing each distance from the axis of the spindle 1 of the left cutting blade 3 and the right cutting blade 3 of the support rod 2. , According to this, packing can be formed by cutting out a ring from a rubber plate or leather.

Since the free cone of the present invention supports the cone on both the left and right sides of the main shaft 1 in the drilling work, the cone does not stand straight on the plate surface of the object to be cut, but the cone is inclined. It enables accurate and reliable drilling without the need to drill deformation holes.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a free cone of the present invention.

FIG. 2 is a plan view of the free cone of the present invention.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is an enlarged bottom view of the presser foot.

FIG. 5 is a sectional view taken along line BB of FIG. 4;

FIG. 6 is a view showing a part of the front surface of a conventional free cone.

FIG. 7 is a plan view of FIG. 6;

[Explanation of symbols]

1 Spindle 1 ₁ Body part 1 ₂ Center drill 1 ₃ Shank 2 Support rod 2 ₁ Top surface part 2 ₂ Dimension scale 3 Cutting blade body 3 ₁ Blade part 3 ₂ Body part 3 ₃ Top surface part 3 ₄ Upper part 4 Engagement hole 5 Bolt 6 Presser 6 ₁ Lower surface 6 ₂ Recess 6 ₃ Ceiling 6 ₄ Through hole 7 Nut 7 ₁ Drive handle 8 Long hole G Gap

Claims (1)

[Scope of utility model registration request] 1. A cutting blade support rod 2 to the trunk portion 1 ₁ of the main shaft 1 intersects the axial direction of the main shaft 1 projecting toward the opposite directions
In those providing the body 3 slidably, the upper surface of the trunk portion 3 ₂
Part 3 ₃ with erected bolts 5 upward on torso 3
Recently supporting rod 2 of ₂ of the upper surface portion 3 ₃ a engaging hole 4 to be engaged
The upper portion 3 of the bored the cutting blade 3 torso 3 _{2 4} supporting rod
Than 2 of the upper surface portion 2 ₁ a support rod 2 so as to protrude upward
It is loosely fitted and is paired with the upper surface portion 3 ₃ of the body portion 3 ₂ of the cutting blade ₃ .
Engages the lower surface portion ₆₁ in the upper portion _{3 4} of the body portion _{3 2} which direction
To order of the depth of the upper portion 3 recessed than the projecting length of ₄
Deep recesses 6 ₂ and upwards from the ceiling 6 _{3 of the} recesses 6 ₂
The presser 6 with through holes 6 ₄ penetration Te, the supporting rod 2
Holes 6 through the bolt 5 of支受been cutting blade 3 ₄ loosely coupling
And engage, the bolt 5 projects above the presser foot 6 and
3 ₂ the upper portion of the body portion 3 that protrudes above the support rods 2
3 ₄ barrel _{3 2} of the upper surface portion _{3 3} a recess 6 on the ceiling of the recess 6 6
_The cutting blade body 3 is engaged so that there is a gap G between the cutting blade body 3 and
And press the button above the work clamp 6 and project from the work clamp 6.
Tighten the nut 7 driven by the drive handle 7 ₁ to the bolt 5
And a loosening of the clamping and clamping engage freely draws toward the lower surface ₆₁ also cutting blade 3 to the upper surface 2 ₁ of the support rod 2 of the presser 6 from below the support rod 2 to the support rod 2 free cone, wherein the by the support rod 2 barrel 3 ₂ of the cutting blade 3 by respectively strongly abut to strongly engaged with the support rod 2 that.