EP4326488B1 - Drehmomentwerkzeug - Google Patents

Drehmomentwerkzeug Download PDF

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Publication number
EP4326488B1
EP4326488B1 EP22714108.2A EP22714108A EP4326488B1 EP 4326488 B1 EP4326488 B1 EP 4326488B1 EP 22714108 A EP22714108 A EP 22714108A EP 4326488 B1 EP4326488 B1 EP 4326488B1
Authority
EP
European Patent Office
Prior art keywords
locking
switching
ring
torque
handle
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.)
Active
Application number
EP22714108.2A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP4326488A1 (de
Inventor
Patrick Klatt
Christian BALLSIEPER
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.)
Hazet Werk Hermann Zerver GmbH and Co KG
Original Assignee
Hazet Werk Hermann Zerver GmbH and Co KG
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 Hazet Werk Hermann Zerver GmbH and Co KG filed Critical Hazet Werk Hermann Zerver GmbH and Co KG
Publication of EP4326488A1 publication Critical patent/EP4326488A1/de
Application granted granted Critical
Publication of EP4326488B1 publication Critical patent/EP4326488B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B25B23/142—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 torque tool, in particular a torque screwdriver according to the features in the preamble of claim 1 and claim 11.
  • Torque tools are hand-operated tools that can be used to apply torque to a workpiece, usually a screw or a nut. Adjustable torque tools can be used to apply a defined tightening torque in order to ensure the necessary clamping force or assembly preload between the components to be connected.
  • a release mechanism is usually housed in the handle. In other torque tools, the release mechanism can also be provided in the lever tube of the torque tool.
  • An adjustment device with a display for a torque to be set is provided in the handle or on the handle of a torque tool.
  • the desired torque is set by compressing a compression spring by rotating the adjusting body on the handle, which is connected to an adjustment mechanism, in particular a threaded spindle, relative to a fixed part of the handle.
  • the adjustment device is fixed by means of a lock that can be operated via a locking body. The lock is unlocked to adjust the torque.
  • the invention is based on the object of improving a torque tool in terms of application technology and of further developing the locking and unlocking in a functional and user-friendly manner.
  • the torque tool and in this case in particular the torque screwdriver has a handle and an adjusting body that can be rotated about the longitudinal axis of the handle for setting a torque.
  • the adjusting body is secured to the Handle can be unlocked and locked.
  • the locking mechanism causes the actuator to be deliberately fixed or blocked. When the lock is locked, it is not possible to operate the actuator to set a torque.
  • the actuator can be operated, in particular an adjustment mechanism or an adjustment device can be used to set a defined torque. This is done in the torque tool according to the invention by twisting or rotating the actuator around the longitudinal axis of the handle.
  • a switching ring is assigned to the locking body.
  • the switching ring can be moved linearly relative to the locking body.
  • At least one switching pin is provided on the switching ring, which is supported on a control track in the actuating body.
  • a locking disk and a spring element that loads the locking disk are arranged between the switching ring and the locking body.
  • the locking disk has locking bodies. These preferably protrude radially to the side of the locking disk.
  • the locking bodies interact with locking receptacles in the handle. By turning the locking body, the switching pin(s) are moved along the control track.
  • the geometric design of the control track causes an axial movement of the switching ring and the locking disk relative to the handle, whereby the locking body is moved out of a locking receptacle or can be moved out of it to unlock the actuating body and is brought or can be brought into engagement with a locking receptacle to lock the actuating body.
  • the design according to the invention can be implemented for torque screwdrivers as well as for torque wrenches. It is particularly advantageous that the torque setting designed according to the invention and the locking of a set torque enable intuitive operation by the user.
  • the current locking or unlocking state can be displayed in at least one viewing window on the circumference of the actuator. The number of viewing windows can be increased almost as desired, taking the design conditions into account.
  • the switching pins When the locking body is rotated, the switching pins move radially along the control track in the actuating body, thereby generating an axial movement.
  • the switching pins are arranged on the circumference of the switching ring.
  • the number and pitch of the switching pins as well as the periodic or alternating repetition of the control track are designed in such a way that the switching positions are changed by rotating the components relative to one another. As a result, the switching positions of unlocking and locking alternate.
  • the control track and its geometry can be designed in such a way that a change in the switching position is effected over equal rotation angle intervals over the circumference of a rotation.
  • a change in the switching position can, for example, take place after a rotation angle of 30°, 45°, 60° or even 90°.
  • a direction of rotation can be made to the right or left without a stop.
  • the control tracks arranged 360° around the actuator allow a change of the switching state without a stop, since the switching pins arranged on the switching ring can travel along the control tracks.
  • the direction of rotation during this process is completely arbitrary and occurs without a stop.
  • the existing elevations and Recesses help to find the corresponding switching points.
  • the axial position of the locking disc which changes when the control tracks are moved, ensures that the actuator is locked accordingly.
  • the locking body engages through a longitudinal slot in a sleeve section of the adjusting body.
  • the locking bodies can be formed by webs or springs.
  • the locking bodies engage through the longitudinal slot in the sleeve body of the adjusting body and protrude radially from the circumference of the sleeve section. In the longitudinal slots, the locking bodies are guided linearly, i.e. straight and in the longitudinal axis of the handle.
  • a guide element on the locking body is designed in the form of a guide spring on a support of the locking body and a guide element on the switching ring is designed in the form of a guide groove on the inner circumference of the switching ring.
  • control track is formed all the way around an inner ring of the actuating body, with alternating elevations and depressions being provided.
  • the control track can have slopes, sloped sections or curved sections. It is essential that the control track and the switching pins moved along the control track generate a relative axial movement when the actuating body rotates, by means of which the locking body or bodies can be moved out of a locking receptacle or into a locking receptacle.
  • each elevation of the control track forms a switching position in which the actuating body is unlocked, whereas each depression of the control track forms a switching position in which the actuating body is locked.
  • detents or similarly designed safety contours can be provided in the individual switching positions, in which the switching pins can be oriented in position or are inhibited by limited friction.
  • At least one viewing window is provided on the circumference of a ring section of the actuating body to indicate the locking state of the actuating body.
  • several viewing windows are provided, arranged offset from one another around the circumference.
  • the ring section encompasses a cover ring.
  • the cover ring is assigned to the locking body in a rotationally fixed manner.
  • the cover ring has symbols for visualizing the locking state of the actuating body, which are each visible through the at least one viewing window. Such symbols can be pictograms, for example a lock in the open state or a lock in the closed state, which convey the corresponding information about the locking state.
  • An advantageous embodiment of the torque tool according to the invention provides that the spring component is positioned on a holder component. This is advantageous both in terms of construction and assembly technology.
  • the holder component has a base section and locking elements, wherein the locking elements engage in locking receptacles on the actuating body.
  • the locking body and the switching ring are only radially coupled by means of the guide elements, in particular via a tongue and groove guide, so that the switching ring can move axially when traveling along the control track.
  • the locking body and the switching ring can be moved linearly relative to one another by means of the guide elements.
  • the spring-loaded locking disc rests tangentially on the switching pin. Every axial movement of the switching ring is transmitted synchronously to the locking disc.
  • On the circumference of the locking disc there are preferably two, or possibly several, locking bodies which engage through longitudinal slots in the sleeve section of the actuating body and protrude from the respective longitudinal slot.
  • the locking bodies can be integrated into the locking receptacles provided in the handle via the spring force acting on the locking disc.
  • the locking receptacles are preferably designed as short grooves oriented along the longitudinal axis of the handle. If the locking bodies are in integrated into the locking receptacles, a rotationally fixed connection between the handle and the adjusting body is guaranteed. If the locking receptacles and the locking bodies are not on top of each other, they can only be integrated automatically or moved by the spring force when they are on top of each other or are congruent. The locking bodies then lock automatically into the locking receptacles due to the axial force of the spring element. When unlocking, the switching pin moves on the control track against the spring force of the spring element.
  • the axial movement transmitted in this way causes the locking body to move out of the locking receptacles in the handle.
  • the lock is released and the adjusting body is unlocked.
  • the torque can be adjusted using the adjusting body.
  • the locking body is moved to a switching position to lock the mechanism.
  • the locking bodies engage in the locking receptacles and the torque tool or the torque adjustment is secured against unintentional adjustment of the torque tool.
  • the locking mechanism engages independently or automatically. Since the locking disc is permanently subjected to an axial force by the spring element, the locking bodies can engage independently in the locking receptacles.
  • the torque tool 1 has a handle 2 and a display 3 for a set torque and an output 4.
  • an adjustment device 5 for setting a specific torque or a defined tightening torque.
  • the adjustment device 5 comprises an adjustment mechanism (not described in detail here) with which the desired torque is set by compressing a compression spring 6.
  • the adjustment device 5 and its adjustment mechanism interact with an adjusting body 7 on the handle 2.
  • the adjusting body 7 can be rotated relative to the handle 2 about its longitudinal axis L.
  • the torque is set by rotating the adjusting body 7 relative to the fixed part of the handle 2.
  • the adjusting body 7 is fixed by means of a lock 8, which is actuated via a locking body 9.
  • the output 4 of the torque tool 1 is arranged on the front side of the handle 2.
  • the output 4 is designed to accommodate interchangeable insert tools.
  • the output 4 is equipped with a holding system 10 designed for insert tools.
  • the display 3 for a set torque has a digit roller counter 11 with several digit rollers 12 arranged one behind the other, which can be read through an opening 13 in the handle 2.
  • the adjusting body 7 can be unlocked and locked by a locking body 9 opposite the handle 2.
  • the lock 8 of the adjusting body 7 is released. This is done by turning the locking body 9 at the rear end of the handle 14.
  • the locking body 9 is operated manually.
  • the locking body 9 is provided with a handle 15 and grip recesses 16 at the rear handle end 14.
  • the locking body 9 can be rotated about the longitudinal axis L in both directions. By rotating the locking body 9, the switching position or the locking state of the actuating body 7 changes from the unlocked state to the locked state and vice versa.
  • the currently set locking or unlocking state is visible in a viewing window 17 to display the locking state.
  • the Figure 1 shows the torque tool 1 or its actuator 7 in the unlocked state. A symbol in the form of an open padlock can be seen in the viewing window 17.
  • the locking state or unlocking state of the actuator 7 is in the "unlocked" switch position. In this locking state, the torque value can be reduced or increased by turning the actuator 7. When the target value is reached, the actuator 7 is locked again so that the setting value cannot be accidentally changed.
  • the Figure 3 shows the torque tool 1 in the locked state of the actuator 7. In the viewing window 17 there is a symbol in the form of a closed padlock. The user recognizes this locking state in the viewing window 17.
  • a switching ring 18 is assigned to the locking body 9, wherein the switching ring 18 is linearly displaceable relative to the locking body 9.
  • Switching pins 19 are provided on the switching ring 18, which are supported on a control track 20 in the actuating body 7.
  • a locking disk 21 and a spring element 22 loading the locking disk 21 are arranged between the switching ring 18 and the locking body 9.
  • the spring element 22 is a compression spring.
  • the spring element 22 is positioned in a holder component 23.
  • the holder component 23 has a base section 24 and locking elements 25.
  • the locking elements 25 are provided on spring arms 26, which protrude from the base section 24 in the direction of the actuating body 7.
  • the locking elements 25 have detents.
  • the locking elements 25 engage in locking receptacles 27 in the actuating body 7.
  • the holder component 23 surrounds a support 29 of the locking body 9 with a central guide section 28.
  • the locking disc 21 has locking bodies 30, which interact with locking receptacles 31 in the handle 2.
  • the locking bodies 30 each engage through a longitudinal slot 32 in a sleeve section 33 of the actuating body 7.
  • the locking body 9 and the switching ring 18 can be moved linearly relative to one another by means of guide elements 34, 35.
  • a guide element 34 on the locking body 9 is designed as a guide spring on the support 29 of the locking body 9.
  • the guide element 35 on the switching ring 18 is designed in the form of a guide groove on the inner circumference 36 of the switching ring 18.
  • the switching pins 19 are moved along the control track 20 in the circumferential direction and an axial movement of the switching ring 18 and the locking disk 21 relative to the handle 2 in its longitudinal axis L is caused.
  • the axial movement moves the locking bodies 30 out of the locking receptacles 31 to unlock the actuating body 7, whereas the locking bodies 30 are brought into engagement with the locking receptacles 31 to lock the actuating body 7.
  • the control track 20 is formed circumferentially on an inner ring 37 of the actuating body 7, with alternating elevations 38 and depressions 39 being provided. See in particular the illustrations in the Figures 8 and 9 .
  • Each elevation 38 forms a switching position in which the actuating body 7 is unlocked.
  • Each depression 39 forms a switching position in which the actuating body 7 is locked.
  • the number and pitch of the switching pins 19 corresponds to the number and pitch of the viewing windows 17 provided on the actuating body 7 on the one hand and, on the other hand, to the periodic repetition of the control track 20 and the switching positions formed on the control track 20 and repeating alternately.
  • the locking body 9 and the switching ring 18 are radially position-oriented via the guide elements 34, 35, i.e. the guide grooves and the guide springs, but can be moved linearly relative to one another axially, so that the switching ring 18 can move axially when traveling along the control track 20.
  • the locking disk 21 is supported tangentially on the switching pin 19 by the spring element 22, spring-loaded. Every axial movement of the switching ring 18 is transmitted synchronously to the locking disk 21.
  • the two locking bodies 30 are located on the circumference of the locking disk 21.
  • the locking bodies 30 are designed as web sections. These engage through the longitudinal slots 32 in the sleeve section 33 of the adjusting body 7 and protrude radially from the circumference of the sleeve section 33.
  • the locking bodies 30 engage in the locking receptacles 31 in the handle 2 via the spring force of the spring element 22 acting on the locking disk 21.
  • the locking receptacles 31 are formed by grooves. A plurality of such groove-shaped locking receptacles 31 are provided on an inner ring section 40 on the inner circumference of the handle 2.
  • the locking bodies 30, loaded by the spring force of the spring element 22, are inserted into the locking receptacles 31 when they are congruently positioned one above the other.
  • the actuating body 7 is coupled to the handle 2 and connected in a rotationally fixed manner. Adjustment of the actuating body 7 is not possible when the locking mechanism 8 is locked.
  • the locking body 9 is actuated and the switching position is changed from the locking state of the actuating body 7 to the unlocking state of the actuating body 7. This is done by a rotary movement of the locking body 9 about the longitudinal axis L of the handle 2. The rotary movement moves the switching pins 19 on the control track 20 against the spring force of the spring element 22. The transmitted axial movement causes the locking bodies 30 to move out of the locking receptacles 31 in the handle 2, so that the actuating body 7 can be rotated relative to the handle 2 and a torque setting can be made.
  • the control track 20, which runs 360° in the actuator 7, enables a stop-free change in the switching state or the locking state of the actuator 7, since the switching pins 19 arranged on the switching ring 18 can travel along the control track 20.
  • the direction of rotation during this process is completely arbitrary and occurs without stops.
  • the elevations 38 and depressions 39 define the corresponding switching points or the locking/unlocking state.
  • the axial position of the locking disk 21, which changes when the control track 20 is traveled, ensures the corresponding locking or unlocking of the actuator 7.
  • the locking bodies 30 engage independently or automatically into the locking receptacles 31. This is achieved by the locking disk 21 being permanently subjected to an axial force by the spring element 22.
  • the viewing windows 17 for displaying the locking state of the actuating body 7 are provided on the circumference of a ring section 41 of the actuating body 7.
  • several viewing windows 17 arranged offset from one another on the circumference are designed as openings in the ring section 41 of the actuating body 7.
  • the ring section 41 can encompass a cover ring, whereby the cover ring is rotationally fixed to the locking body 9.
  • the cover ring has symbols for Visualization of the unlocking and locking state of the actuator, which are each visible through a viewing window.
  • FIG. 11 An embodiment of a torque tool 1 with a cover ring 42 is shown in the illustration of the Figure 11 .
  • Symbols 43 for visualizing the unlocking and locking state of the actuating body 7 are distributed around the circumference of the cover ring 42.
  • the cover ring 42 is assigned to the locking body 9 in a rotationally fixed manner and sits on a connecting piece section 44 of the locking body 9.
  • the cover ring 42 is encompassed by the ring section 41 of the actuating body 7.
  • the symbols 43 for the unlocking and locking state of the actuating body 7 can be seen through the viewing windows 17.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Surgical Instruments (AREA)
  • Drilling Tools (AREA)
EP22714108.2A 2021-04-21 2022-03-10 Drehmomentwerkzeug Active EP4326488B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202021102127.6U DE202021102127U1 (de) 2021-04-21 2021-04-21 Drehmomentwerkzeug
PCT/DE2022/100196 WO2022223068A1 (de) 2021-04-21 2022-03-10 Drehmomentwerkzeug

Publications (2)

Publication Number Publication Date
EP4326488A1 EP4326488A1 (de) 2024-02-28
EP4326488B1 true EP4326488B1 (de) 2025-02-12

Family

ID=81074041

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22714108.2A Active EP4326488B1 (de) 2021-04-21 2022-03-10 Drehmomentwerkzeug

Country Status (7)

Country Link
US (1) US12128534B2 (https=)
EP (1) EP4326488B1 (https=)
JP (1) JP7644260B2 (https=)
CN (1) CN117042922B (https=)
DE (1) DE202021102127U1 (https=)
TW (1) TWI824465B (https=)
WO (1) WO2022223068A1 (https=)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI897829B (zh) * 2025-03-31 2025-09-11 詹福義 扭力結構

Family Cites Families (31)

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US2732747A (en) * 1956-01-31 Spring adjusting means therefor
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EP0393852B1 (en) 1989-04-21 1994-01-12 Mhh Engineering Co Ltd A torque-indicating screwdriver
SE470449B (sv) 1992-08-31 1994-04-11 Sandvik Ab Låsbar spännanordning för fjäder
DE20309969U1 (de) 2003-06-27 2003-09-04 Lee, Chang-Chuan, Cao Tun Zhen, Nan Tou Verstellbarer Drehmomentenschlüssel mit festgelegtem Torsionswert
US7044036B1 (en) * 2003-10-31 2006-05-16 Snap-On Incorporated Preset torque wrench with multiple setting torque selector mechanism
US7484442B1 (en) * 2007-07-11 2009-02-03 Chang-Ying Chen Torque adjustable screwdriver having a torque indicator
CN201082530Y (zh) 2007-08-06 2008-07-09 腾达工具工业有限公司 工具的定扭力装置
US8245606B2 (en) * 2009-11-16 2012-08-21 William Tools Co., Ltd. Adjustable torque wrench having lock device
US8479620B2 (en) * 2010-07-03 2013-07-09 Mikawa Co., Ltd. Torque-setting device
DE202011050282U1 (de) 2011-05-30 2011-07-11 Hazet-Werk Hermann Zerver Gmbh & Co. Kg Drehmomentwerkzeug
CN103358265B (zh) 2012-03-26 2016-06-15 杭州巨星工具有限公司 可调扭力螺丝批
TWM438356U (en) 2012-05-03 2012-10-01 zhi-ji Chen Ratchet wrench auxiliary control structure
DE102012020909B3 (de) 2012-10-24 2014-01-23 Jin-Tsai Lai Anordnung zur Drehmomentverstellung für einen Schraubendreher
US8960058B2 (en) * 2013-05-30 2015-02-24 Jin Tsai LAI Torque adjustment device for screwdriver
DE102013009358B4 (de) * 2013-06-03 2018-03-22 Jin-Tsai Lai Konstruktion zur Einstellung des Drehmoments am Schraubendreher
CN104608099B (zh) 2013-11-04 2017-04-19 南京德朔实业有限公司 一种输出扭矩的电动工具
GB2528696A (en) * 2014-07-29 2016-02-03 Norbar Torque Tools Torque wrench
TWM492808U (zh) 2014-08-29 2015-01-01 Zhu-Cun Chen 具鎖固裝置之扭力扳手
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CN205703930U (zh) * 2015-12-28 2016-11-23 南京德朔实业有限公司 扭力输出工具
CN205514875U (zh) * 2016-01-29 2016-08-31 美敦力公司 螺丝刀
TWI581917B (zh) 2016-11-16 2017-05-11 陳怡富 Torque wrench positioning device
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TWM547455U (zh) 2017-05-08 2017-08-21 Di-Jen Chen 扭力扳手之調整鎖緊環定位結構
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TWI666093B (zh) * 2018-05-08 2019-07-21 優鋼機械股份有限公司 辨識扭力調整機構鎖定狀態之扭力工具
TWI671165B (zh) * 2019-02-01 2019-09-11 陳狄任 扭力扳手之扭力調整切換結構
TWI729844B (zh) * 2020-06-09 2021-06-01 黃鴻文 扭力扳手
US11311989B2 (en) * 2020-06-28 2022-04-26 Matatakitoyo Tool Co., Ltd. Warning device for a torque adjustor of a torque wrench
TWI754540B (zh) * 2021-02-05 2022-02-01 特典工具股份有限公司 扭力工具

Also Published As

Publication number Publication date
WO2022223068A1 (de) 2022-10-27
US12128534B2 (en) 2024-10-29
CN117042922A (zh) 2023-11-10
CN117042922B (zh) 2024-02-06
TW202241653A (zh) 2022-11-01
DE202021102127U1 (de) 2022-07-22
EP4326488A1 (de) 2024-02-28
JP2024511895A (ja) 2024-03-15
JP7644260B2 (ja) 2025-03-11
TWI824465B (zh) 2023-12-01
US20240198503A1 (en) 2024-06-20

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