WO2002058890A2 - Screwdriver - Google Patents
Screwdriver Download PDFInfo
- Publication number
- WO2002058890A2 WO2002058890A2 PCT/EP2001/014224 EP0114224W WO02058890A2 WO 2002058890 A2 WO2002058890 A2 WO 2002058890A2 EP 0114224 W EP0114224 W EP 0114224W WO 02058890 A2 WO02058890 A2 WO 02058890A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- handle
- shaft
- screwdriver according
- screwdriver
- projection
- Prior art date
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
- B25B23/142—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
-
- 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
- B25B23/1425—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 electrical means
Definitions
- the invention relates to a screwdriver with a shaft which is provided at one end with engagement means for engaging in a screw head and at the opposite end with a handle in which the shaft is anchored.
- Screwdrivers are tools for manual screwing and unscrewing of screws, and are known as such in a wide variety of embodiments.
- the handle of commercially available screwdrivers is usually made of plastic or wood.
- the handles have different shapes, which should enable safe work without the screwdriver slipping out of the hand or slipping while handling.
- Screwdrivers with torque limitation are already known in the prior art. With these screwdrivers it is possible to pre-set a certain torque. When this torque is reached, further tightening of the screw is impossible. Such screwdrivers with torque limitation are, however, technically very complex and much too expensive for normal users.
- the invention is therefore based on the object of providing a particularly inexpensive screwdriver which also enables a technically inexperienced user to pretension screws with a small diameter with the right feeling for the correct torque in each case without over-tightening the screws or the thread, damage the screw head or the contact surfaces of the clamped parts repairable.
- the screwdriver according to the invention it is possible to make the transmitted torque clearly perceptible to the user of the screwdriver by a suitable design of the elastically deformable area of the handle, even if this torque is relatively small.
- the screwdriver according to the invention thus provides the inexperienced user with particular sensitivity when tightening small screws in a particularly simple manner.
- the indicator device can, for example, have a lateral projection of the shaft which is rigidly connected to the shaft and which projects into a recess in the handle and is free in the region of the grip surfaces of the handle for touching from the outside. When the shaft is rotated relative to the handle, this projection emerges from the grip surface of the handle and can be felt by the user. The emergence of the projection from the recess is a sign for the user that a certain, permissible torque has been exceeded.
- the rigid projection of the shaft can expediently be formed by a laterally bent end of the shaft. This is advantageous in terms of production technology, because only the upper end of the shaft, which is assigned to the handle, needs to be bent laterally during production.
- the end of the rigid projection is conical. This gives the end of the protrusion a sharp tip that emerges from the gripping surface when the permissible torque is exceeded and is more palpable.
- the handle is expediently designed as a thin plate made of elastic material directed towards the side of the projection.
- a thin plate made of elastic material saves material and overall is easily elastically deformable.
- the recess for the projection of the shaft is designed as a window which is arranged in the plate and is open on both sides and into which the projection projects.
- the handle suitably consists entirely of plastic.
- the handle can also be designed as a thin, elastic metal plate.
- a cylindrical extension is expediently provided on the handle in the extension of the axis of the shaft, which is intended for rapid screw rotation. This approach can be taken between the thumb and forefinger before the screw is actually tightened and can be rotated by the relative displacement of the thumb and forefinger.
- the cylinder is provided with profile channels on the outside.
- an alternative embodiment of the indicator device provides that the handle is provided with electrical and / or magnetic sensors which detect the relative movement between the handle and the shaft and display it optically and / or acoustically by means of a display device.
- the user is no longer dependent on his sense of touch, but gets optically - z. B. by an LED - or acoustically - z. B. by a beep - indicated when a certain torque is exceeded.
- Light barriers, proximity switches or the like are suitable as electrical and / or magnetic sensors. It is particularly advantageous if the sensors are designed as strain gauges arranged in the elastic deformation region of the handle.
- Another embodiment of the indicator device provides that a releasable latching connection is provided between the rigid projection of the shaft and the handle, which engages noticeably or audibly when the handle is deflected relative to the shaft.
- a sheet which can be deformed in the manner of a snap frog can also be used as an indicator device in the elastically deformable region of the handle be arranged, which audibly or noticeably jumps around when the handle is deflected relative to the shaft.
- Fig. 1 A screwdriver according to the
- Fig. 2 A screwdriver according to the
- Fig. 4 A screwdriver according to the
- the screwdriver shown in Figure 1 has a shaft 1, which is provided at its free end with engagement means 2 for engagement in a screw head, not shown. At the opposite end, the shaft 1 is firmly connected to a handle 3 made of elastic plastic, which is designed as a thin, laterally projecting plate.
- the shaft 1 is provided within the handle 3 with a lateral projection 4, which is formed by a laterally angled end of the shaft 1 and is tapered at the end.
- the projection 4 projects into a recess 5, which is provided as an open window on both sides in the handle 3.
- a cylindrical extension 6 is formed, which lies in the extension of the shaft 1.
- the cylindrical extension 6 is provided on the outside with profile grooves or corrugations in order to improve the grip.
- the engagement end 2 of the shaft 1 is first inserted into the screw head, not shown. So you grab the cylindrical extension 6 between your thumb and index finger and turn the screws as long as they can still be loosely screwed in - quickly.
- the handle made of elastic plastic deforms such that when a certain torque is reached, the projection 4 emerges laterally from the recess 5, which is perceived by the sense of the thumb and / or the index finger. This lateral emergence of the projection 4 from the recess 5 is a sign that a certain torque has been reached, which should not be exceeded.
- the screwdriver can be designed for the indication of different torques by appropriate selection of the material and design of the handle in the elastic range.
- the handle 3 is here provided with electrical and / or magnetic sensors 7, which detect the relative movement between the handle 3 and the shaft 1 and display it optically or acoustically by means of a display device 8.
- the display device 8 for the optical display can be provided with one or more LEDs 9. Acoustic signal transmitters may also take the place of LED 9.
- strain gauges can also be used as sensors, which are arranged at a suitable point in the elastically deformable region of the handle 3.
- additional openings 10 are provided in the handle 3, which are intended to facilitate the elastic deformation of the handle 3. These openings 10 run above and below parallel to the outer edge of the handle 3, so that easily deformable webs 11 remain at the top and bottom, which carry the central part of the handle 3. When using the handle, these webs 11 can be deformed relatively easily, so that the projection 4 of the shaft 3 emerges even more clearly from the plane of the handle 3.
- the projection 4 of the shaft 1 is covered with plastic in this embodiment. This plastic covering is made in one piece with the entire handle using the injection molding process.
- a releasable latching connection 12 is provided between the handle 3 and the rigid projection 4 of the shaft, the latching elements of which snap out audibly or noticeably when the handle 3 moves under the action of the applied torque relative to the projection 4 rigidly connected to the shaft 1 becomes.
- a sheet 13 which can be deformed in the manner of a snap frog, is finally arranged in the elastically deformable region of the handle 3 and audibly and / or noticeably jumps around when the handle 3 is deflected.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2002238411A AU2002238411A1 (en) | 2001-01-26 | 2001-12-05 | Screwdriver |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10103730.9 | 2001-01-26 | ||
DE2001103730 DE10103730C2 (en) | 2001-01-26 | 2001-01-26 | screwdriver |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2002058890A2 true WO2002058890A2 (en) | 2002-08-01 |
WO2002058890A3 WO2002058890A3 (en) | 2002-11-07 |
Family
ID=7671972
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2001/014224 WO2002058890A2 (en) | 2001-01-26 | 2001-12-05 | Screwdriver |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU2002238411A1 (en) |
DE (1) | DE10103730C2 (en) |
WO (1) | WO2002058890A2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IL159027A (en) * | 2003-11-24 | 2008-03-20 | Hanoch Guy | Torque indicating wrench |
DE102010023705A1 (en) * | 2010-06-14 | 2011-12-15 | Eva Fahrzeugtechnik Gmbh | Torque spanner e.g. standard hexagonal spanner, for roof carrier of motor vehicle, has inner housing that extends partially inside outer housing, where inner housing detects torsion of torsion body at location |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE8912570U1 (en) * | 1989-10-24 | 1991-02-28 | Veith, Wolfgang, Dr.-Ing., 6900 Heidelberg, De | |
US5737983A (en) * | 1994-03-31 | 1998-04-14 | Torque System Sweden Ab | Dynamometric wrench |
SE507995C2 (en) * | 1997-05-02 | 1998-08-10 | Sandvik Ab | Torque spanner for tightening screws, bolts, nuts and similar |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4314490A (en) * | 1980-06-30 | 1982-02-09 | Stone Gregory M | Torque wrench with alarm indicator |
US4838134A (en) * | 1988-06-09 | 1989-06-13 | Ruland Manufacturing Company, Inc. | Torque wrench |
-
2001
- 2001-01-26 DE DE2001103730 patent/DE10103730C2/en not_active Expired - Fee Related
- 2001-12-05 WO PCT/EP2001/014224 patent/WO2002058890A2/en not_active Application Discontinuation
- 2001-12-05 AU AU2002238411A patent/AU2002238411A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE8912570U1 (en) * | 1989-10-24 | 1991-02-28 | Veith, Wolfgang, Dr.-Ing., 6900 Heidelberg, De | |
US5737983A (en) * | 1994-03-31 | 1998-04-14 | Torque System Sweden Ab | Dynamometric wrench |
SE507995C2 (en) * | 1997-05-02 | 1998-08-10 | Sandvik Ab | Torque spanner for tightening screws, bolts, nuts and similar |
Also Published As
Publication number | Publication date |
---|---|
AU2002238411A1 (en) | 2002-08-06 |
DE10103730A1 (en) | 2002-08-29 |
WO2002058890A3 (en) | 2002-11-07 |
DE10103730C2 (en) | 2003-04-30 |
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