EP4249171A2 - Clé dynamométrique pouvant être utilisée comme clé à cliquet - Google Patents

Clé dynamométrique pouvant être utilisée comme clé à cliquet Download PDF

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Publication number
EP4249171A2
EP4249171A2 EP23187007.2A EP23187007A EP4249171A2 EP 4249171 A2 EP4249171 A2 EP 4249171A2 EP 23187007 A EP23187007 A EP 23187007A EP 4249171 A2 EP4249171 A2 EP 4249171A2
Authority
EP
European Patent Office
Prior art keywords
torque
torque transmission
screwing tool
blocking
recess
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.)
Pending
Application number
EP23187007.2A
Other languages
German (de)
English (en)
Other versions
EP4249171A3 (fr
Inventor
Michael Abel
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.)
Wera Werkzeuge GmbH
Original Assignee
Wera Werkzeuge GmbH
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 Wera Werkzeuge GmbH filed Critical Wera Werkzeuge GmbH
Publication of EP4249171A2 publication Critical patent/EP4249171A2/fr
Publication of EP4249171A3 publication Critical patent/EP4249171A3/fr
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING, OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B25B23/141—Mechanical overload release couplings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING, OR HOLDING
    • B25B13/00—Spanners; Wrenches
    • B25B13/46—Spanners; Wrenches of the ratchet type, for providing a free return stroke of the handle
    • B25B13/461—Spanners; Wrenches of the ratchet type, for providing a free return stroke of the handle with concentric driving and driven member
    • B25B13/462—Spanners; Wrenches of the ratchet type, for providing a free return stroke of the handle with concentric driving and driven member the ratchet parts engaging in a direction radial to the tool operating axis
    • B25B13/463—Spanners; Wrenches of the ratchet type, for providing a free return stroke of the handle with concentric driving and driven member the ratchet parts engaging in a direction radial to the tool operating axis a pawl engaging an externally toothed wheel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING, OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B25B23/142—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers
    • B25B23/1422—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers torque indicators or adjustable torque limiters
    • B25B23/1427—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers torque indicators or adjustable torque limiters by mechanical means

Definitions

  • the invention relates to a screwing tool with a torque output body which defines an axis and is mounted in a housing, with a torque transmission section having a plurality of recesses, with a torque transmission body which engages in at least one of the recesses and is biased by a force from an energy accumulator for torque-transmitting coupling of the torque transmission section to the housing, which torque-transmitting coupling is canceled when the torque transmission body leaves the recess in an edge-controlled manner when a limit torque is exceeded against the force of the energy accumulator that can be set by an adjusting device.
  • a screwing tool of the type described above is known from DE 20 2018 003 607 U1 .
  • the screwing tool described there has a housing with a head and a drive arm protruding from the head.
  • a torque output body with a square section onto which a nut or other screw drive tool can be attached.
  • the torque output body has external teeth with gaps arranged between teeth.
  • a torque transmission body engages in one of the gaps and is acted upon by a plunger, which in turn is acted upon by a compression spring.
  • the preload of the compression spring can be adjusted.
  • the set preload of the compression spring defines a limit torque, which is transferred from the housing to the torque output body. If the torque exceeds the limit torque, the torque transmission body emerges from the recess.
  • the blocking element can then form the depression overflowing the limiting tooth.
  • the drive arm which projects radially from an axis of rotation from the head, can thus be pivoted freely, so to speak, without the torque output body rotating. With the screwing tool, only limited torque can be transferred to a screw connection.
  • the DE 10 2008 055 581 A1 describes a torque wrench with a head in which a freewheel gear is arranged.
  • the head sits in a forked end of a two-part arm.
  • a first part of the arm, which has the fork, is pivotally attached to the second part of the arm, which has a handle. If a limit torque is exceeded, the two arm parts can pivot slightly against each other, which is accompanied by a clicking noise that indicates that a limit torque has been reached.
  • the DE 10 2012 103 782 A1 describes a ratchet wrench in which a torque output body is arranged in a head from which a drive arm projects, which is connected to the head via a freewheel lock. There is a movable polygonal section in the freewheel locking mechanism, which can optionally protrude from one of the broad sides of the torque output body, so that a screw connection can be turned both clockwise and counter-clockwise with the screwing tool.
  • Screwing tools of the type described above are also disclosed in the CN201020685 , DE 10 2017 107 784 A1 , US 3,707,893 A and the US 7,458,297 B1 .
  • the invention is based on the object of further developing the screwing tool in a way that is advantageous for use.
  • the task is solved by the invention specified in the claims.
  • a screwing tool designed according to the invention is initially and essentially characterized by the fact that a switching element is provided.
  • the switching element can be moved from a release position to a blocking position.
  • the torque transmission body can leave the recess when a limit torque is reached, as described above. However, this is not possible in the blocked position.
  • the tool In the release position, the tool functions as a torque wrench.
  • the blocking position the tool has the function of a conventional screwing tool, which can also be used to transmit torques that are above the limit torque.
  • the screwing tool has a freewheel gear between the torque transmission section and the torque transmission body, so that the screwing tool can be used as a ratchet wrench in the blocking position, as in the DE 10 2012 103 782 A1 is described.
  • a freewheel gear is provided in the torque transmission path between the torque output body and the torque transmission section.
  • the torque wrench can also be used in narrow spaces, since pivoting a handle arm arranged on a head back and forth, for example, is sufficient to gradually transmit a rotary movement to a screw connection.
  • the torque transmitted from the screwing tool to the screw connection increases until a limit torque is reached.
  • the torque transmission body slips out of the recess of the torque transmission section, so that the screw connection can only be screwed with an adjustable limit torque.
  • a switching element is provided, which is designed as a sleeve part.
  • the sleeve part is opposite Movable housing. In particular, it can be moved relative to the housing.
  • the switching element can cooperate with at least one blocking element.
  • the switching element preferably works together with several blocking elements.
  • the blocking element can be a ball.
  • the housing can have a window in which the blocking element is arranged.
  • the housing and in particular an arm of the housing preferably has a tube in which the at least one window is arranged. If several blocking elements are provided, the housing has several windows.
  • a plunger can be arranged within the housing. The plunger lies in the force transmission path between the torque transmission body, which can be a ball, and the force storage, which can be a compression spring.
  • the plunger can have one or more blocking recesses.
  • the blocking recesses are arranged in such a way that they are spatially assigned to a window of the housing when the torque transmission body is located in one of the plurality of recesses.
  • the blocking element In the blocking position, the blocking element is prevented from emerging from the blocking recess, for example in that an opening of the window pointing in the outer direction of the housing is closed by an abutment flank of the switching element. In the blocking position, the blocking element cannot leave the blocking recess. If a torque is applied to the housing, this torque is transmitted to the torque transmission section with the torque transmission body, which positively engages in a recess in the torque transmission section.
  • the one designed as a circular cylinder Torque transmission body lies in a recess, the bottom of which is adapted to the outline contour of the torque transmission body. The bottom of the recess extends in particular along an inner cylindrical surface.
  • the bottom runs on an arcuate line between the two tips of the teeth delimiting the recess, the arc angle being less than 90°.
  • the sections of the bottom wall of the recess adjacent to the teeth thus form oblique flanks in order to apply force to the torque transmission body when a torque is applied.
  • these forces are diverted via the blocking elements into the housing, i.e. in particular the pipe.
  • the torque transmission section is connected to the torque output body via the freewheel gear, so that the torque is transmitted to the torque output body.
  • the latter can have an output pin onto which a nut or the like can be placed in order to transmit the torque to a screw head or a nut.
  • the plunger In the blocking position, the plunger cannot move relative to the housing.
  • the recess has oblique flanks or rounded flanks that convert the torque into a force that forces the torque transmission body out of the recess.
  • the force acts on the plunger, which is acted upon by the spring of the energy accumulator. If the switching element is in the release position, the plunger can shift with the technical success described above that when an adjustable limit force is exceeded, the torque transmission body slips out of the recess and, for example, overflows a tooth delimiting the recess in order to enter a further recess. In the blocking position, displacement of the plunger is not possible, so that the torque transmission body is permanently held in a form-fitting manner in the recess.
  • the torque transmission section preferably has a gear-like shape with teeth evenly distributed in the circumferential direction, between which the depressions are located.
  • the torque transmission section rotatably mounted in a head of the housing, which is preferably located radially outside the torque output body, can thus rotate by any angular degrees within its bearing opening in the head when the torque applied to it exceeds the limit torque.
  • the torque output body can have an output pin that is adjustable in the axial direction with respect to the axis of rotation, as shown in FIG DE 10 2012 103 782 A1 is previously known. The content of this document is fully incorporated into the disclosure content of this application.
  • the output pin has a polygonal section on both ends, which can either protrude from one of the two broad sides of the head pointing away from each other, so that the screwing tool can be used to screw in both a clockwise and counter-clockwise direction.
  • the plunger has two, three or four or more blocking recesses arranged on a peripheral surface.
  • the blocking recesses are each spatially assigned to a window in which a blocking element lies.
  • the blocking recesses or the windows can be arranged in a uniform circumferential distribution around an axis of extension of the drive arm.
  • an adjusting device which can be used as a handle or is adjacent to a handle and with which the force of the energy accumulator and thus the limit torque can be adjusted by turning the handle.
  • a locking element can be provided with which the rotation of the adjusting device can be blocked.
  • the drive arm preferably projects in the radial direction in relation to a screw rotation axis.
  • the teeth of the torque transmission section preferably project radially outwards, so that they form external teeth.
  • the torque transmission body located in the tooth gap is preferably displaced out of the recess in the radial direction.
  • the plunger also shifts in the radial direction in relation to the screwing direction in order to compress the preloaded spring arranged in a cavity in the drive arm.
  • the drive arm is therefore preferably designed as a tube. On this pipe the switching element can be linear be displaceably arranged, the switching element preferably being arranged immediately adjacent to the head.
  • the screwing tool shown in the figures has a housing 1 which has a head 2 at a first end.
  • the head 2 has a cavity in which a rotatable body rests.
  • the rotatable body is made up of several parts. It has a torque output body 4 with a polygonal cavity in which there is an output pin 22, which is displaceable in relation to the axis of rotation A of the torque output body 4 in order to protrude with a polygonal section either on one or the other broad side of the head.
  • the torque output body 4 is via one in the Figure 7 recognizable freewheel gear coupled to a torque transmission section 5.
  • the torque transmission section 5 has a cavity in which the torque output body 4 is inserted.
  • the torque output body 4 has external teeth into which a locking body 17 located in a bearing recess 18 of the torque transmission section 5 can engage.
  • the locking body 17 is urged into a locking position by a spring, so that when the torque transmission section 5 rotates clockwise, the torque output body 4 is entrained in rotation. However, it will If the torque transmission section 5 is rotated counter-clockwise, the counter-toothing of the locking body 17 can emerge from the external teeth of the torque output body 4, so that the torque transmission section 5 can rotate freely relative to the torque output body 4.
  • the freewheel gear attention is paid to the DE 10 2016 101 400 A1 and to those named therein DE 10 2014 113 758 A1 referred. The disclosure content of these writings is included in the disclosure content of this application.
  • the torque transmission section 5 has teeth 15 which point radially outwards in relation to the screwing direction and are arranged in a uniform circumferential distribution around the center. There are trough-like tooth gaps between the teeth, which form depressions 6.
  • the wall of the recess 6 is formed by a curve.
  • the rounding corresponds to a rounding of a torque transmission body 7 formed by a cylinder, which can engage in one of the recesses 6.
  • the torque transmission body 7 is acted upon by a plunger 8, which extends in a cavity of a drive arm 3, which projects in the radial direction from the head 2 in relation to the screwing direction.
  • the plunger 8 is acted upon by a compression spring 19, which forms an energy accumulator and which is prestressed.
  • an adjusting device 20 which is assigned to a handle 24 arranged at the free end of the drive arm 3, the preload of the compression spring 19 can be adjusted.
  • a clamping element 27 which is coupled via a thread to a tube 23 formed by the arm 3, is displaced axially relative to the tube 23.
  • a display 25 is provided, which can be observed through a window 21, on which the currently set torque is displayed.
  • the clamping element 27 acts against a pressure piece 26, which acts on the spring 19, which is supported with its other end on the plunger 8.
  • the plunger 8 has a total of four blocking recesses 10 arranged in a uniform circumferential distribution on its jacket wall (see Figure 6 ), each of which has a blocking element 9 in the form of a ball. Relative to an extension axis of the drive arm 3, each of the four blocking elements 9 can move in a radial direction within a window 11 of the tubular drive arm 3 in order to emerge from the blocking recess 10 in a release position of a switching element 12.
  • the switching element 12 and in particular its inner wall have an alternative space 13.
  • the switching element 12 is designed as a sleeve-like slide and sits on the outside of the drive arm 3, in the immediate vicinity of the head 2. By moving the switching element 12 in an axial direction relative to the extension axis of the drive arm 3, the switching element 12 can be moved from a release position to a blocking position to be brought. In the release position, which is in the Figures 4 to 9 is shown, the blocking elements 9 can emerge from the blocking recesses 10 in the radial direction, so that the plunger 8 can move within the drive arm 3.
  • an output pin 22 can be rotated in a constant rotational movement by pivoting the drive arm 3 back and forth about the screw axis. By moving the output pin 22 in an axial direction relative to the screwing direction, the direction of rotation of the screwing tool can be reversed.
  • the switch 12 is located in the Figures 4 to 9 Release position shown, in which the plunger 8 can move relative to the drive arm 3, a limited torque can be transmitted to a screw connection with the screwing tool. If the torque is below a limit torque that can be set using the adjusting device 20, the torque transmission body 7 remains in one of the several recesses 6 during screwing, as is the case Figures 4 and 5 show. A torque is transmitted from the housing 1 to the torque transmission section 5 via the torque transmission body 7.
  • the hollow, the depression 6 forms an oblique flank that converts the torque into a radial force that acts against the preload force of the spring 19.
  • the blocking elements 9 cannot emerge from the blocking recesses 10 assigned to them because they are tied in a form-fitting manner in the blocking recesses 10 by the abutment flank 14.
  • the torque transmission body 7 cannot leave the recess 6 assigned to it even if a limit torque is exceeded, so that in the blocking position of the switching element 12, torques can also be transmitted that are greater than the limit torque and the screwing tool can be used as a "normal" ratchet/ratchet can be used.
  • the forces transmitted from the torque transmission body 7 to the plunger 8 are transmitted via the blocking elements 9 designed as balls into the walls of the windows 11 of the tube 23.
  • the pipe 23 is connected to the head 2 in a tension-proof manner, the forces are diverted back into the head 2.
  • a screwing tool which is characterized in that a freewheel gear 16, 17, 18 is provided in the torque transmission path between the torque and the torque output body 4 and the torque transmission section 5.
  • a screwing tool that is characterized by a switching member 12 that can be moved from a release position to a blocking position, which allows the torque transmission body 7 to leave the recess in the release position, but blocks it in the blocking position.
  • a screwing tool which is characterized in that the switching element 12 is a sleeve part which is displaceably guided on the housing 1 and which cooperates with at least one blocking element 9, which is movably mounted in particular in a window 11 of the housing 1 and which, in particular, in the blocking position in a blocking recess 10 of a plunger 8 is tied, which is arranged in the power transmission path between the torque transmission body 7 and the energy storage 19.
  • a screwing tool which is characterized in that the plunger 8 has two, three, four or more blocking recesses arranged on a peripheral surface 18 each for the entry of an associated blocking element 9.
  • a screwing tool which is characterized in that the switching element 12 forms an escape space 13 for the blocking element 9 in the release position with a first section of its inner wall and an abutment flank 14 for the blocking element 9 in the blocking position with a second section of its inner wall.
  • a screwing tool which is characterized in that the torque output body 4 is arranged in a head 2 formed by the housing 1, a drive arm 3 protruding from the head 2, in which a spring forming the energy accumulator 19 is arranged, which is supported by the plunger 8 being interposed the torque transmission body 7 acts.
  • a screwing tool which is characterized in that the recesses 6 are formed by tooth gaps arranged between teeth 15.
  • a screwing tool which is characterized in that the switching member 12 is linearly displaceable in relation to the direction of extension of the drive arm 3 between the blocking position and the release position.
  • a screwing tool which is characterized in that the recess 6 is a trough, the wall of which extends in cross section to the axis A along a circular arc line, the radius of which corresponds in particular to the radius of the torque transmission body 7 designed as a cylinder, the arc length being smaller than a quarter circle , whereby the sections of the wall of the recess 6 adjacent to the teeth form oblique flanks for controlling the torque transmission body 7 from the recess 6.
  • the invention also relates to designs in which individual features mentioned in the above description are not implemented, in particular to the extent that they are clearly dispensable for the respective intended use or can be replaced by other technically equivalent means.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
EP23187007.2A 2018-12-12 2019-12-09 Clé dynamométrique pouvant être utilisée comme clé à cliquet Pending EP4249171A3 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102018131903.7A DE102018131903A1 (de) 2018-12-12 2018-12-12 Als Knarre verwendbarer Drehmomentschlüssel
EP19818031.7A EP3894134B1 (fr) 2018-12-12 2019-12-09 Clé dynamométrique pouvant être utilisée comme clé à cliquet
PCT/EP2019/084226 WO2020120397A1 (fr) 2018-12-12 2019-12-09 Clé dynamométrique pouvant être utilisée comme clé à cliquet

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP19818031.7A Division EP3894134B1 (fr) 2018-12-12 2019-12-09 Clé dynamométrique pouvant être utilisée comme clé à cliquet
EP19818031.7A Division-Into EP3894134B1 (fr) 2018-12-12 2019-12-09 Clé dynamométrique pouvant être utilisée comme clé à cliquet

Publications (2)

Publication Number Publication Date
EP4249171A2 true EP4249171A2 (fr) 2023-09-27
EP4249171A3 EP4249171A3 (fr) 2024-03-20

Family

ID=68848273

Family Applications (2)

Application Number Title Priority Date Filing Date
EP23187007.2A Pending EP4249171A3 (fr) 2018-12-12 2019-12-09 Clé dynamométrique pouvant être utilisée comme clé à cliquet
EP19818031.7A Active EP3894134B1 (fr) 2018-12-12 2019-12-09 Clé dynamométrique pouvant être utilisée comme clé à cliquet

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP19818031.7A Active EP3894134B1 (fr) 2018-12-12 2019-12-09 Clé dynamométrique pouvant être utilisée comme clé à cliquet

Country Status (6)

Country Link
US (2) US11752603B2 (fr)
EP (2) EP4249171A3 (fr)
CN (1) CN218504384U (fr)
DE (1) DE102018131903A1 (fr)
TW (1) TWI832937B (fr)
WO (1) WO2020120397A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11707822B2 (en) * 2021-07-02 2023-07-25 Wen-Chin Kuo Torque structure
TWI786004B (zh) * 2022-03-16 2022-12-01 大軍產業股份有限公司 扭力扳手的扭力調整結構
TWI862305B (zh) * 2023-11-28 2024-11-11 和嘉興精密股份有限公司 扭力結構
DE102024100847A1 (de) 2024-01-12 2025-07-17 Wera Werkzeuge Gmbh Kalibrierung eines Drehmomentschlüssels mittels maschinenlesbarer Codes
DE102024130238A1 (de) 2024-10-17 2026-04-23 Wera Werkzeuge Gmbh Umschaltbarer Drehmomentschlüsssel

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DE202018003607U1 (de) 2018-08-02 2018-08-13 Torque-Tech Precision Co., Ltd. Gleitbarer Drehmomentschlüssel

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3707893A (en) 1970-10-20 1973-01-02 B Hofman Mechanical speed ratchet
CN201020685Y (zh) 2007-03-29 2008-02-13 李万传 可转换手动或电动操作模式的棘轮扳手工具
US7458297B1 (en) 2007-11-23 2008-12-02 Hsuan-Sen Shiao Electronic torque wrench having a trip unit
DE102008055581A1 (de) 2008-12-23 2010-06-24 Wera Werk Hermann Werner Gmbh & Co. Kg Drehmomentschlüssel mit veränderbarem Arbeitswinkel
DE102012103782A1 (de) 2012-04-30 2013-10-31 Wera-Werk Hermann Werner Gmbh & Co. Kg Knarre mit hin und her verschiebbarem Abtriebsschaft
DE102014113758A1 (de) 2013-10-15 2015-04-16 Wera-Werk Hermann Werner Gmbh & Co. Kg Schraubwerkzeug mit richtungsumstellbarem Gesperre
DE102016101400A1 (de) 2016-01-27 2017-07-27 Wera-Werk Hermann Werner Gmbh & Co. Kg Schraubwerkzeug mit richtungsumschaltbarem Freilaufgesperre
DE102017107784A1 (de) 2016-10-28 2018-05-03 Bobby Hu Elektro-Schneller-Ratschenschlüssel und Verfahren zu dessen Benutzung
DE202018003607U1 (de) 2018-08-02 2018-08-13 Torque-Tech Precision Co., Ltd. Gleitbarer Drehmomentschlüssel

Also Published As

Publication number Publication date
EP4249171A3 (fr) 2024-03-20
DE102018131903A1 (de) 2020-06-18
US20230405778A1 (en) 2023-12-21
EP3894134A1 (fr) 2021-10-20
EP3894134B1 (fr) 2023-09-06
TW202031429A (zh) 2020-09-01
WO2020120397A1 (fr) 2020-06-18
TWI832937B (zh) 2024-02-21
US20220143793A1 (en) 2022-05-12
US11752603B2 (en) 2023-09-12
CN218504384U (zh) 2023-02-21

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