EP1631418A1 - Screwdriver with torque control - Google Patents
Screwdriver with torque controlInfo
- Publication number
- EP1631418A1 EP1631418A1 EP04733337A EP04733337A EP1631418A1 EP 1631418 A1 EP1631418 A1 EP 1631418A1 EP 04733337 A EP04733337 A EP 04733337A EP 04733337 A EP04733337 A EP 04733337A EP 1631418 A1 EP1631418 A1 EP 1631418A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blade
- handle
- compression spring
- screwdriver
- tooth part
- 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.)
- Granted
Links
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
- 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 screwdriver having a handle and a blade, the handle having a front handle portion adjoining the blade and a rear handle portion facing away from the blade, the rear handle portion having a cavity for at least partially receiving a blade cooperating with the blade Torque limiting device and the handle to the axial direction of the handle substantially immovable blade penetrates a through hole of the front handle part, wherein the torque limiting device axially and rotationally connected to the blade first tooth part forms and a rotationally fixed and against the restoring force of a compression spring axially displaceable Handle associated second tooth part, wherein the tooth parts forming the blade end teeth, the teeth of which form inclined edges, which are pressed by the compression spring against each other and upon reaching a limit rotation momentes slide on each other.
- a generic screwdriver is previously known from US 4,063,474. Within the cavity of the rear handle portion is a torque limiting arrangement. The triggering torque is adjustable there. A consisting of several handle parts screwdriver handle is also previously known from EP 0925 0 A2. US Pat. No. 5,764,298, US Pat. No. 2,396,040 and US Pat. No. 2,797,564 also disclose screwdrivers having a plurality of gripping parts, which are in particular screwed together and which form a cavity in which a torque limiting arrangement lies.
- the torque limitation can come into effect by the fact that, when a limit torque is reached, the tooth flanks slide off one another and slide over one another when a triggering torque is reached.
- a significantly higher torque can be applied in this direction of rotation.
- the helical compression spring is supported on spacers. By selecting the thickness or the number of spacers, the limit torque can be adjusted.
- the end portion of the blade may penetrate a portion of the helical compression spring.
- the blade-proof tooth part is supported on an abutment surrounding the blade as a collar.
- the counter-tooth part which is axially displaceable within the handle against the restoring force of the compression spring, has on its outer circumferential wall in the direction of displacement extending ribs. These ribs protrude into rib gaps of corresponding ribs associated with the cavity wall of the cavity.
- the printing spring can not only rest on the bottom of the cavity.
- the compression spring is supported on the bearing collar.
- the blade-proof tooth part can be located in the region of the free end of the blade. The entire torque limiting device is then firmly associated with the blade.
- the blade After loosening the front handle part, the blade can be taken out of the cavity together with the two tooth parts and the prestressed compression spring. This facilitates maintenance and assembly. Moreover, it is advantageous if the blade axially and rotationally fixed tooth part is supported on a washer, which is fixed by means of a screwed onto the free end of the blade nut. With this mother can then adjust the release torque.
- the counter-tooth part preferably forms a cavity. This cavity is formed as an annular cavity and can accommodate a portion of the compression spring. The compression spring then rests on the bottom of the ring cavity.
- the preferred shape of the handle is in addition to the elongated handle and the angle handle.
- the two handle parts are locked together in the screwed state such that they are again unscrewed after destruction of one of the parting planes associated locking member.
- the screw connection between the two handle parts can be solved at any time, for example, to change the release torque by replacing the spring or other components, this is no longer possible according to the invention.
- the disassembly of the two handle parts is connected to the destruction of a locking member, manipulations of the limit torque are immediately recognizable.
- the locking member is formed so that the break is easily visible externally.
- each of the two grip parts forms a step in the region of the parting plane. This level forms in the screwed state an annular groove.
- the ring covers the dividing plane between the two handle parts.
- Each of the two stages forms at least one recess.
- the recesses lie side by side in such a way that they complement each other to form a pocket.
- the locking member of the ring In this bag is in the screwed state, the locking member of the ring.
- This locking member forms a projection with two sections. One section is located in one of the two recesses, so that the recesses can not be rotated apart without the projection is destroyed.
- the handle is made of plastic.
- the ring can also be made of plastic. It may be a plastic injection-molded part, which the locking member is integrally formed material.
- Figure 2 shows the ring with two radially inwardly directed locking members.
- FIG. 3 shows a section along the line III - III in Fig. 4.
- Fig. 5 is an enlarged view of a detail of Fig. 3;
- FIG. 6 shows a section along the line VI - VI in Fig. 4.
- Figure 7 is a section along the line VII - VII in Fig. 4.
- FIG. 8 shows a second embodiment of the screwdriver according to the invention with an angle handle in the view
- Fig. 11 is a view of the blade with the torque limiting assembly installed
- Fig. 12 is a section along the line XII - XII in Fig. 10 and
- the screwdriver consists of a handle 1 and a blade 2.
- the handle 1 consists of two plastic parts 3,. It is a front handle part 3, the end face of the blade 2 springs, and a rear handle part 4, which forms a dome 5, which lies on the side facing away from the blade of the handle 1.
- the blade 2 is rotatable relative to the handle 1 when a tripping torque is exceeded.
- the handle has in an inner cavity 9 but a locking mechanism which forms a torque limiting arrangement, with which by turning the handle 1 on the blade 2, a torque can be applied.
- the blade turns in the handle. In the opposite direction significantly higher torques can be transmitted.
- the front handle part 3 forms an internal thread 6.
- an external thread 7 of a threaded flange of the rear handle 4 can be screwed.
- the front handle part 3 forms to form a parting plane 8 in touching contact with the rear handle part 4.
- a stage 11 ', 11 "in the bolted together form the two stages 11 ', 11 "an annular groove 11 from.
- In the center of the bottom of the annular groove 11 extends the parting plane 8.
- This plastic ring 12 has at two diametrically opposite points radially inwardly raving locking members 10.
- Each of the two locking members 10 forms a first projection 10th
- the second portion 10 lies in a recess 13" of the rear grip part 4.
- the two projections savings 13 'and 13 "form a bag 13 when screwed together.
- the second portion 10 " which rests in the recess 13", designed as a spring tongue.
- the rear grip part 4 can shift there to the left relative to the front grip part 3. If the spring tongue 10 "acted upon by the boundary of the recess 13", it can dip into the other recess 13 '. A displacement of the rear handle part 4 relative to the front handle part 3 in the opposite direction, ie to the right, is not possible because the spring tongue 10 "is blocking the corresponding wall of the recess 13".
- the rear grip part 4 is nevertheless displaced to the right (in the screwing-on direction) in relation to the front grip part 3, so that the spring tongue 10 "or the entire catch element 10 breaks off from the ring recognizable by the screwdriver handle.
- the cavity 9 of the rear handle portion 4 has not shown, extending in the axial direction grooves or ribs. In the grooves of the wall of the cavity 9 engage ribs of a counter-tooth part 15, not shown.
- the counter-tooth part 15 has a toothing 15 'which corresponds to the toothing 14'.
- On the rear end face of the counter-tooth part 15 are spacers 17.
- On the spacers 17, a helical compression spring 16 is supported, which is supported with its other end on the bottom of the cavity 9.
- An end portion of the plastic-coated blade protrudes into the cavity of the helical compression spring 16 a. This end portion of the blade 2 extends through the sleeve-shaped counter-tooth part 15th
- the rear handle part 4 forms a bearing wall 19, against which an annular collar 18 of the tooth part 14 is supported. With a bearing projection 20, the tooth part 14 is supported on an abutment 21 of the front grip part 3, so that it rests axially fixed in the handle 1. The tooth part 14 receives the blade 2. The blade 2 is stuck with its end in the up to the hollow of the compression spring 16 extending plastic part 14th
- the triggering torque can be adjusted.
- the blade 2 penetrates with game an axial cavity of the front handle part. 3
- the entire torque limiting arrangement is fixedly associated with the blade.
- the blade 2 consists of a hexagonal steel with a gradation 30. On this gradation 30, a circular metal disc 18 is supported. This metal disc 18 forms a bearing disc.
- the tapered portion of the blade 2 in itself is supported on the rear broad side surface of the bearing plate 18 is a strong helical compression spring with a rectangular winding profile from. The clamping force of this helical compression spring 16 defines the limit torque at which the teeth 28 to be explained below a toothing 15 and a counter toothing 15 are disengaged.
- the end facing away from the bearing plate 18 end of the helical compression spring 16 is inserted into an annular cavity 29 which is associated with a counter-tooth part 15.
- the counter-tooth part 15 is made of plastic and has ribs 23 on its outer wall.
- the counter tooth part 15 forms saw teeth 27. These saw teeth 27 are located on the bottom of the annular groove on which the compression spring 16 is supported, opposite side. The teeth 28 engage in gaps of saw teeth 27 of a toothed part 14.
- the tooth part is also made of plastic. But it is rotatably and axially fixed to the blade 2 assigned. The force of the prestressed compression spring 16 presses the toothed part 14 against a threaded portion 24 the washer 2 associated washer 26. The washer 26 is held by a nut 25 which is screwed onto the threaded portion 24.
- the front handle part 3 forms a closure cap. This cap is clipped into a diameter-extended portion of the cavity 9. An inner collar of the front grip part 3 forms an abutment 21, on which the bearing plate 18 can be supported.
- this screwing tool For mounting, first the bearing plate 18 is pushed over the reduced diameter portion of the blade 2. Then, the compression spring 16 and the counter tooth part 15 are mounted. On the counter-tooth part 15, the tooth part is then pushed, which forms a collar 30 which projects into a bottom-side guide opening of the counter-tooth part 15. With the interposition of the washer 26 is then tensioned by screwing the nut 25 on the threaded portion 24, the compression spring. The preassembled in the figure 11 part is then inserted into the opening 9 of the rear handle part 4, where it rests force-free. The outer edge of the bearing plate 18 is supported on the end faces of the ribs 22. These form the bearing wall 19. The Drehnionientbegrenzungs liked velvet blade 2 is held by means of the cap 3 within the cavity, the edge of the collar forms the abutment 21 which rests against the forward facing broad side of the bearing plate 18.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE20320337 | 2003-05-17 | ||
DE102004016521A DE102004016521A1 (en) | 2003-05-17 | 2004-04-03 | Screwdriver with torque limitation |
PCT/EP2004/005283 WO2004101227A1 (en) | 2003-05-17 | 2004-05-17 | Screwdriver with torque control |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1631418A1 true EP1631418A1 (en) | 2006-03-08 |
EP1631418B1 EP1631418B1 (en) | 2006-12-27 |
Family
ID=33454220
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04733337A Expired - Lifetime EP1631418B1 (en) | 2003-05-17 | 2004-05-17 | Screwdriver with torque control |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1631418B1 (en) |
AT (1) | ATE349299T1 (en) |
DE (1) | DE502004002463D1 (en) |
WO (1) | WO2004101227A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2019238932A1 (en) | 2018-06-15 | 2019-12-19 | Wera Werkzeuge Gmbh | Torque-limiting device and method for the calibration thereof |
TWI783835B (en) * | 2021-12-22 | 2022-11-11 | 歐玉華 | Constant torque tool |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011017061B4 (en) * | 2011-04-14 | 2015-12-31 | Wiha Werkzeuge Gmbh | Screwdriver with torque limiter |
JP2022517447A (en) * | 2019-01-25 | 2022-03-09 | ゴーティエ バイオメディカル インコーポレイテッド | Improved axis protection mechanism for tools |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2733622A (en) * | 1956-02-07 | evans | ||
US2797564A (en) * | 1954-08-11 | 1957-07-02 | Joseph C Bonneau | Adjustable torque tool |
GB856136A (en) * | 1956-03-26 | 1960-12-14 | M H H Engineering Company Ltd | Torque limiting wrenches |
GB913388A (en) * | 1960-10-13 | 1962-12-19 | Gen Electric Co Ltd | Improvements in or relating to screwdrivers and like tools |
FR1569991A (en) * | 1968-04-23 | 1969-06-06 | ||
US4448098A (en) * | 1982-03-10 | 1984-05-15 | Katsuyuki Totsu | Electrically driven screw-driver |
US5746298A (en) * | 1996-07-19 | 1998-05-05 | Snap-On Technologies, Inc. | Adjustable torque-limiting mini screwdriver |
DE19942292C2 (en) * | 1999-09-04 | 2001-09-27 | Daimler Chrysler Ag | Intermediate link for a handheld screwdriver shaft |
SE9903639L (en) * | 1999-10-11 | 2000-09-18 | Kapman Ab | Torque limited screwdriver |
EP1110512A1 (en) * | 1999-12-20 | 2001-06-27 | Sulzer Orthopedics Ltd. | Medical tool holder with torque limitation |
DE10011506A1 (en) * | 2000-03-09 | 2001-09-13 | Wuerth Adolf Gmbh & Co Kg | Torque transmission tool |
-
2004
- 2004-05-17 EP EP04733337A patent/EP1631418B1/en not_active Expired - Lifetime
- 2004-05-17 WO PCT/EP2004/005283 patent/WO2004101227A1/en active IP Right Grant
- 2004-05-17 AT AT04733337T patent/ATE349299T1/en not_active IP Right Cessation
- 2004-05-17 DE DE502004002463T patent/DE502004002463D1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO2004101227A1 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2019238932A1 (en) | 2018-06-15 | 2019-12-19 | Wera Werkzeuge Gmbh | Torque-limiting device and method for the calibration thereof |
TWI783835B (en) * | 2021-12-22 | 2022-11-11 | 歐玉華 | Constant torque tool |
Also Published As
Publication number | Publication date |
---|---|
DE502004002463D1 (en) | 2007-02-08 |
WO2004101227A1 (en) | 2004-11-25 |
ATE349299T1 (en) | 2007-01-15 |
EP1631418B1 (en) | 2006-12-27 |
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