EP0358884A1 - Tournevis - Google Patents

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Publication number
EP0358884A1
EP0358884A1 EP89112938A EP89112938A EP0358884A1 EP 0358884 A1 EP0358884 A1 EP 0358884A1 EP 89112938 A EP89112938 A EP 89112938A EP 89112938 A EP89112938 A EP 89112938A EP 0358884 A1 EP0358884 A1 EP 0358884A1
Authority
EP
European Patent Office
Prior art keywords
section
handle
screwdriver
blade
cross
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.)
Withdrawn
Application number
EP89112938A
Other languages
German (de)
English (en)
Inventor
Karl Lieser
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 Werk Hermann Werner GmbH and Co KG
Original Assignee
Wera Werk Hermann Werner 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 Wera Werk Hermann Werner GmbH and Co KG filed Critical Wera Werk Hermann Werner GmbH and Co KG
Publication of EP0358884A1 publication Critical patent/EP0358884A1/fr
Withdrawn legal-status Critical Current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
    • B25B15/00—Screwdrivers
    • B25B15/02—Screwdrivers operated by rotating the handle
    • B25B15/04—Screwdrivers operated by rotating the handle with ratchet action
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25G—HANDLES FOR HAND IMPLEMENTS
    • B25G1/00—Handle constructions
    • B25G1/08—Handle constructions with provision for storing tool elements
    • B25G1/085—Handle constructions with provision for storing tool elements for screwdrivers, wrenches or spanners
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25G—HANDLES FOR HAND IMPLEMENTS
    • B25G1/00—Handle constructions
    • B25G1/10—Handle constructions characterised by material or shape
    • B25G1/105—Handle constructions characterised by material or shape for screwdrivers, wrenches or spanners

Definitions

  • the invention relates to a screwdriver according to the preamble of claim 1.
  • Corresponding screwdrivers are known from DE-OS 25 03 372.
  • the relevant booklet is ergonomic, assembly technology and unsatisfactory in terms of stability. This applies in particular to fine screwdrivers, where the space available, in particular for accommodating the one-way clutch, is very limited anyway when it comes to smaller screwdriver types.
  • the sprags of the one-way clutch are located in a symmetrical arrangement on both sides of a circumferential retraction of the booklet to the practically smallest cross-sectional dimension of the same. Therefore, no high forces can be transmitted with such a one-way clutch, let alone that this could happen without wear over longer periods of use.
  • the object of the invention is therefore based on the object of designing a generic screwdriver in a technically simple manner in such a way that its handle on the one hand allows sensitive screwing work and on the other hand allows the possibility of high force application.
  • a screwdriver of the type in question of increased utility value is created. It is particularly suitable for precision screwdriving activities in which only a small amount of force or torque is introduced over a large proportion of the screwdriving path.
  • the screwdriver is actuated essentially finger dynamically, namely by turning the blade-side handle portion by means of the thumb and index finger and possibly also by means of the middle finger. Due to the one-way clutch, the other handle section, lying in the hand, can be held by the ring and small fingers, and the switch ring is gripped by the fingers without contact due to its position in which it is hidden.
  • the hand switches, so to speak, to finger-static screwing, the torque applied by the hand being introduced into the blade shaft via the handle-grip section facing away from the blade and the one-way clutch.
  • the hand comes out of the screw grip into the grip. This happens almost automatically by the person operating the screwdriver as soon as he recognizes that the further turning of the screw requires a greater torque.
  • the changeover ring lies unactuated in its hiding place. Comfortable work with the screwdriver is achieved in that the rotary joint lies in the area of the largest section of the booklet. The largest cross-section is available for the one-way clutch. This also reduces wear and free travel due to larger tolerances. The force to be applied to turn the changeover ring is reduced.
  • the one-way clutch is specially designed so that there is a continuous and extremely smooth rotation of the handle sections.
  • the handle section facing away from the blade is connected in a rotationally fixed manner to an outer drive ring part.
  • the latter rotatably takes a drive core part, which is approximately triangular in cross section and connected to the blade-side handle section, to form wedge-shaped clamping spaces. All of this lies on the transverse plane of the largest cross section.
  • a clamping body is accommodated in one clamping space, which clamping bodies can be displaced in the release position to the wedge walls of the associated clamping space by the switching ring which locks in its switching positions by the drivers engaging on the clamping bodies.
  • the latter block the transition of the clamping bodies into one of their clamping positions. Otherwise they are free and do not give any inhibition.
  • the screwdriver has a handle 1 with a blade shaft 2 extending therefrom.
  • the handle 1 is composed of two handle gripping sections 3 and 4 arranged one behind the other in the axial direction of the blade shaft 2, approximately the same axis length, such that the two handle gripping sections 3, 4 under Intermediate connection of a one-way clutch 5 abut in a rotary joint 6.
  • FIG. 1 in particular illustrates that the handle sections 3, 4 taper without any undercuts, starting from the largest handle cross section, such that the largest diameter D of the blade-side handle section 4 corresponds approximately to the smallest end diameter d of the head-side handle section 3.
  • the head end 7 of the handle portion 3 has approximately the shape of a hemisphere in order to obtain a good contact surface in the operating hand. Due to the truncated cone shape of the handle sections 3, 4, it is possible to create appropriate plastic injection molds without a longitudinal division joint, which facilitates any post-treatment of the molded parts.
  • a switching ring 8 is provided between the two handle sections 3, 4, for changing the freewheeling direction.
  • the latter forms a taper between the two handle sections.
  • the truncated cone angle of this tapering step corresponds to approximately 90 ° and is therefore many times larger than that of the handle portion 3, 4. Accordingly, the switching ring 8 is in a hiding position between the two handle portions.
  • the transition to the handle sections 3, 4 takes place via corresponding radii 9, 10 while avoiding annoying projections.
  • the blade-side handle-gripping section 4 contains a magazine 11 for receiving screwdriver inserts 12.
  • the magazine 11 has six magazine-holding compartments 13 arranged in the same circumferential distribution and pointing in the axial direction in the form of sack recesses, the mouth openings 14 of which on the front side of the handle-gripping section 4 have a turntable 15 is assigned.
  • the latter is located directly in front of the blade-side end face 4 'of the handle portion 4 and rotatably mounted on the blade shaft 2.
  • the turntable 15 is supported by the fact that the blade shaft 2, which is hexagonal in cross section, merges into a circular-cylindrical portion 17 to form a step 16.
  • the turntable 15 accordingly has a central bearing bore 18, which is penetrated by the circular cylindrical section 17.
  • the bearing bore 18 is adjoined by a bearing opening 19 which is larger in cross section. Their diameter is as large as the corner dimension of the blade shank 2. The length of the bearing opening 19 corresponds to a multiple of that of the bearing bore 18.
  • the step 16 gives the turntable 15 a limit stop in the direction of the booklet 1.
  • the turntable 15 is removed from section 17 prevented by a locking ring 20 which lies in an annular groove 21 of the circular cylindrical portion 17. To accommodate the locking ring 20, the turntable 15 forms a recess 23 on its lower end face 22.
  • the turntable 15 can be locked in six rotational positions, in which its opening 24 is aligned with one of the magazine receiving compartments 13.
  • a latching ball 26, which is accommodated in a radial bore 25 of the rotary plate 15, serves for latching.
  • a compression spring 27 loads the latching ball 26 in the inward direction. The latter works together with locking recesses 28, which are provided in the same cross-sectional plane at the level of the edges of the polygonal blade shaft.
  • the turntable 15 is such that it has a polygonal outer periphery 29. This is designed in the form of a pentagon and protrudes across the cross section of the end face 4 'of the blade-side handle portion 4. As a transition between the pentagon and the end face 4 'serves a circumferential ring zone 30 of the turntable 15, which merges smoothly into the handle portion 4. This ring zone 30 can also take on a further function by preventing the corresponding fingers of the actuating hand from slipping in the direction of the blade.
  • the circular cylindrical section 17 is equipped at its end with a receiving opening (not shown) for inserting a screwdriver bit 12.
  • a screwdriver bit can be removed in the handle.
  • the pentagon shape of the turntable enables easier rotation of the turntable by means of the index finger of the grasping hand into a position in which the screwdriver insert to be removed or the magazine receiving compartment is aligned with the opening 24 of the turntable. Then the screwdriver bit 12 slides out and can be brought into the use position. It is not necessary to close the respective magazine storage compartment since there is no screwdriver insert in it.
  • the handle section 3 facing away from the blade rotatably receives a drive ring part 31, the front end of which is on the blade side and lies in the rotary joint 6.
  • the drive ring part 31 supports the pin 33 of an output core part 34 which is approximately triangular in cross section and in which the inner end of the blade shaft 2 sits non-rotatably and immovably.
  • the output core part 34 is axially secured to the drive ring part 31 by a locking ring 35 inserted between them.
  • the polygonal blade shaft then passes through a cross-section-adapted longitudinal opening 36 of the blade-side handle portion 4, so that it forms a jointly rotating unit with the output core part 34.
  • the handle portion 4 is secured in the axial direction against being pulled off by the turntable 15.
  • the triangularly shaped output core part 34 has three triangular sides 37, which are connected to one another by guide surfaces 37 'running concentrically to the blade axis. Between the triangular sides 37 and the inside Wall 38 of the drive ring part 31, terminal spaces 39 are formed. Each of these clamping spaces forms clamping gussets in its end regions lying in the circumferential direction. A roller-shaped clamping body 40 lies loosely in each clamping space 39.
  • the switching ring 8 which projects into the drive ring part 31 with three drivers 41 arranged in the same angular distribution, serves to control the clamping bodies 40. The drivers 41 thus lie between the drive ring part 31 and the driven core part 34.
  • the changeover ring 8 is provided with groove-like locking recesses 42, 43 which extend in the axial direction and which cooperate with a locking ball 44 of the driven core part 34.
  • the driven core part 34 has on one of its bisectors a blind bore 45 for receiving the locking ball 44 and a compression spring 46 which acts on it in the outward direction.
  • the locking ball 44 engages with the projecting area in a positive manner in the locking recess 43, in which position the drivers 41 reach approximately to the middle of the respective triangular sides 37 and thus prevent the transfer of the clamping bodies 40 into the other clamping gusset of the clamping spaces 39.
  • the operating hand changes from the grip handle to the grip handle.
  • the finger forces of the hand thereby act essentially on the handle portion 3, so that the screw is tightened by means of the hand-dynamic screwing action.
  • This switch from the grip handle to the grip handle happens automatically when the screw resistance increases during the twisting, which greatly simplifies the screwing process.
  • the shape of the booklet is such that when twisting the handle section facing away from the blade lies very well in the hand and is supported on the inner palm.
  • the one-way clutch 5 has no locked central position, so that it always only works in one or the other direction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
EP89112938A 1988-09-10 1989-07-14 Tournevis Withdrawn EP0358884A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19883830859 DE3830859A1 (de) 1988-09-10 1988-09-10 Schraubendreher
DE3830859 1988-09-10

Publications (1)

Publication Number Publication Date
EP0358884A1 true EP0358884A1 (fr) 1990-03-21

Family

ID=6362715

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89112938A Withdrawn EP0358884A1 (fr) 1988-09-10 1989-07-14 Tournevis

Country Status (2)

Country Link
EP (1) EP0358884A1 (fr)
DE (1) DE3830859A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0978356A2 (fr) * 1998-08-03 2000-02-09 The Stanley Works Limited Magasin pour les plaquettes d'un outil à main
EP0978355A3 (fr) * 1998-08-03 2000-03-22 The Stanley Works Limited Dispositif de commande à cliquet
WO2023232639A1 (fr) * 2022-05-31 2023-12-07 Wera Werkzeuge Gmbh Outil de vissage équipé d'un mécanisme de blocage de roue libre à sens réversible

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005007117B4 (de) * 2005-02-17 2012-02-16 Felo-Werkzeugfabrik Holland-Letz Gmbh Magazingriff für Werkzeug-Einsätze, insbesondere Schraubendreher-Einsätze

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3325534A1 (de) * 1983-07-15 1984-01-12 Günter 4790 Paderborn Holland-Letz Schraubwerkzeug mit getriebe-uebersetzung
EP0099200A2 (fr) * 1982-06-29 1984-01-25 The Stanley Works Poignée à cliquet
DE3705663A1 (de) * 1985-10-31 1988-05-19 Werner Hermann Wera Werke Schraubwerkzeug

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1816359A (en) * 1929-05-18 1931-07-28 Julius E Carlin Screw-driver
GB638055A (en) * 1948-06-22 1950-05-31 Thomas Gilbert Brooke Hitching An improved screwdriver
US2815837A (en) * 1955-04-20 1957-12-10 Morgan Dev Lab Inc Ratchet screw driver
GB1501391A (en) * 1974-01-29 1978-02-15 Mumford M Screw-drivers
US4290465A (en) * 1979-10-17 1981-09-22 S/V Tool Company, Inc. Hand instrument
DE3630809A1 (de) * 1986-09-10 1987-02-19 Hans Quassowski Schraubendreher

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0099200A2 (fr) * 1982-06-29 1984-01-25 The Stanley Works Poignée à cliquet
DE3325534A1 (de) * 1983-07-15 1984-01-12 Günter 4790 Paderborn Holland-Letz Schraubwerkzeug mit getriebe-uebersetzung
DE3705663A1 (de) * 1985-10-31 1988-05-19 Werner Hermann Wera Werke Schraubwerkzeug

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0978356A2 (fr) * 1998-08-03 2000-02-09 The Stanley Works Limited Magasin pour les plaquettes d'un outil à main
GB2340059A (en) * 1998-08-03 2000-02-16 Stanley Works Ltd Tool bit magazine
EP0978355A3 (fr) * 1998-08-03 2000-03-22 The Stanley Works Limited Dispositif de commande à cliquet
EP0978356A3 (fr) * 1998-08-03 2001-01-31 The Stanley Works Limited Magasin pour les plaquettes d'un outil à main
US6305248B1 (en) 1998-08-03 2001-10-23 The Stanley Works Limited Ratcheting driver
WO2023232639A1 (fr) * 2022-05-31 2023-12-07 Wera Werkzeuge Gmbh Outil de vissage équipé d'un mécanisme de blocage de roue libre à sens réversible

Also Published As

Publication number Publication date
DE3830859C2 (fr) 1992-01-16
DE3830859A1 (de) 1990-03-22

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