Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25G—HANDLES FOR HAND IMPLEMENTS
  • B25G1/00—Handle constructions
  • B25G1/06—Handle constructions reversible or adjustable for position
  • B25G1/063—Handle constructions reversible or adjustable for position for screwdrivers, wrenches or spanners
  • B25G1/066—Handle constructions reversible or adjustable for position for screwdrivers, wrenches or spanners the grip itself being angularly adjustable
• • 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

Definitions

• the present invention relates to a clamping tool of the type comprising a driving part and a driven part which have, in a first position of use, a common axis of rotation, means for tilting the driving part relative to the driven part, and locking means which can assume a positive locking position of the driving part in a position coaxial with the driven part as well as a position of release of the tilting means. It applies in particular to screwdrivers.
• the. _ie driving forms the entire handle, and the driven part is formed by the blade of the screwdriver.
• the handle has a longitudinal slot, which seriously affects the comfort of gripping the handle in said first position of use.
• the object of the invention is to provide economical and reliable means making it possible to exert on a part either a relatively low torque, or a much higher torque, by having a tool identical to the conventional tools in the first. position of use.
• a screwdriver it is a question of making it possible to carry out a rapid screwing followed by an energetic tightening at the end of screwing, or else a release of a screw followed by a rapid unscrewing.
• the invention relates to a clamping tool of the aforementioned type, characterized in that:
• the driving part comprises a proximal part, forming a handle, of the handle of the tool; - the driven part includes a blade holder
• the two parts are mounted coaxially mobile- ment relative to each other to a predetermined remote position to release the tilting means;
• the tilting means comprise at least one transverse pin secured to one of the two parts and movable in a longitudinal groove of the other part provided with a stop; and the locking means comprise an interlocking between the driving part and the driven part.
• the clamping tool according to the invention may include one or more of the following characteristics:
• the longitudinal groove is carried by the male part of the socket and the transverse axis is integral with the female part of the socket;
• the transverse pin is close to the end of the part which carries it;
• the nesting includes a mutual guiding of the two parts by a non-circular shape
• the two parts cooperate by plane surfaces parallel to a predetermined tilting plane;
• the tool comprises braking means, in particular a rod, adapted to increase the friction between the two driving and driven parts during their coaxial movements;
• - Said proximal part of the handle forms a handle having an external shape of revolution;
• the blade holder includes an auxiliary torque transmission device, in particular a pawl; and - The blade passes through said auxiliary device and abuts against the blade holder above this device.
• FIG. 1 is a longitudinal section of a screwdriver according to the invention, in the locked position of the tilting mechanism
• FIG. 2 is a similar view of the screwdriver of Figure 1, in the unlocked position of the tilting mechanism;
• FIG. 3 is a partial elevational view of the tilting mechanism
• FIG. 6 shows the screwdriver in the unlocked position of the tilting mechanism e t, with the handle being tilted, the view being taken along arrow VI of Figure 2;
• FIG. 7 shows in longitudinal section, on a larger scale, part of a variant.
• This screwdriver 1 consists of a handle 2 carrying a blade 3 and has, in its normal position of use, a general axis XX 'assumed to be vertical.
• the handle 2 of the screwdriver 1 is divided into a driving part or handle 4 and a driven part or blade holder 5.
• the handle 4 consists of an outer casing 6 of revolution around the axis XX ', of a shape adapted to be easily gripped by an operator.
• This envelope 6 for example made of plastic, has an elongated shape and has two end, upper 7 and lower 8 edges, flat and horizontal.
• This envelope 6 surrounds a cylindrical core 9 of axis XX ′, for example of steel, the upper end 10 of which is flush with the end 7 of the envelope 6 and of which a lower part 11 projects under the end 8 of this envelope.
• the core 9 On a lower section of the order of a third of its length, the core 9 has a blind axial bore 12 with hexagon as shown in FIG. 4. This bore 12 penetrates clearly into the casing 6 and opens downward.
• FIG. 5 shows that the projecting lower part 11 of the core 9 is split along the diameter of the bore 12, so as to form two legs 13 and 14 diametrically opposite and symmetrical with respect to the axis XX ′. These legs are delimited internally by respective flat and parallel surfaces 15, 16 forming part of the above-mentioned hexagon.
• the upper end 7 of the casing 6 carries a plug 20 in a spherical cap having a base diameter equal to that of this end 7.
• This plug 20 is fixed by a cylindrical finger 21 inserted in a blind bore 22 of axis X -X ', formed in the core 9, the bore 22 being of a depth slightly greater than the length of the finger 21.
• the blade holder 5 consists of a body 23, for example made of plastic, externally frustoconical and slightly converging downwards, having two planar and horizontal ends at the upper end 24 and lower end 25.
• This body 23 is crossed along the axis XX ' by a bore having two successive diameter reductions.
• the bore section 26 having the largest diameter extends over approximately half the height of the body 23 from the upper end 24 thereof, so as to be slightly deeper than the length of the part lower 11 projecting from the core 9.
• the diameter of the section 26 is equal to the outside diameter of this core.
• the intermediate bore section 27 has a hexagonal section identical to that of bore 12, and the second reduction in diameter defines a horizontal shoulder 28 near the lower end 25 of the body 23.
• a shaft 29 of axis XX ′ for example of steel, with a hexagon cross-section conjugate with the section 27 and the bore 12, is inserted by force from above into the body 23 until it abuts on the 'shoulder 28.
• An upper section 30 of this shaft 29 protrudes above the upper end 24 of the body 23.
• Two diametrically opposite longitudinal grooves 31 and 32 extend upwards along the shaft 29, substantially from the bottom of the bore section 26, without opening upwards.
• the depth of these grooves allows the insertion of the projecting ends of the lugs 18 and 19 inside the grooves 31 and 32, with the surfaces 15 and 16 of the legs 13 and 14 in contact with two opposite sides of the shaft 29 .
• a circular elastic ring 33 radially elastic is received in a peripheral groove of the shaft 29, so as to increase the friction between this shaft 29 and the adjacent surfaces of the bore 12 and the legs 13, 14.
• a blind bore 34 This bore opens out on the lower end of the latter and has a diameter slightly less than that of the lower section of the body 23.
• the blade 3 of screwdriver is inserted with friction by the down inside this bore 34 and abuts against the bottom thereof.
• the screwdriver 1 is used as the usual screwdriver, in the configuration of FIG. 1.
• the handle 4 is then vertical to the blade holder 5 while being ver ⁇ rusted therein against any tilting. More specifically, the lower part 11 of the handle 4 is fitted into the bore section 26 of the blade holder 5, while the upper part 30 of the shaft 29 is inserted into the bore 12.
• This locking can be qualified "positive” because it remains when the user exerts a screwing / unscrewing couple and / or a push down and / or a lever force in any radial plane, that is to say for any habitual action exerted when using a conventional screwdriver.
• the handle 4 rotates the blade holder 5 by virtue of the hexagonal shape of the bore 12 and of the shaft 29 and possibly by the cooperation of the pins 18 and 19 and grooves 31 and 32.
• the handle 4 is then unlocked, keeping the blade holder 5 fixed and pulling upwards the handle 4.
• the pins 18 and 19 slide in the grooves 31 and 32 until they come into abutment at the upper end of these.
• the upper part of the shaft 29 then being entirely between the legs 13 and 14, the handle 4 can be tilted around the horizontal axis YY 'defined by the pins 18 and 19, as shown in Figure 6.
• This part 4 thus constitutes a lever arm, and it is easy to exert a high torque on the screw, transmitted to the blade holder 5 via the surfaces 15 and 16.
• the legs 13 and 14 are very short at beyond the pins 18 and 19, they do not protrude relative to the blade holder 5 and therefore do not increase the size of the tool when the handle 4 is tilted.
• the handle does not risk tipping unexpectedly during use in the "normal" position.
• FIG. 7 represents a variant of blade holder 5 in which a reversible pawl 35 is incorporated.
• This pawl has a conventional general structure, with a stator constituted by the body 23, a rotor 36 which has a flat vertical surface 37 extending along a cord, a movable corner 38, a spring 39 for biasing this corner towards one end or the other of the surface 37, and a selection ring 40 which internally carries a lug 41 for engaging the spring.
• the ring 40 is rotatably mounted at the lower end of the body 23 by means of a circular elastic ring 42, and its rotation in one direction or the other defines the active direction of the pawl.
• the shaft 29 of FIGS. 1 and 2 has come integrally with the body 23.
• the blade 3 (which, in the example shown, is reversible) freely crosses a central orifice of the ring 40, then crosses at friction between the rotor 36 and the shaft 29, until it stops at the bottom of the bore 34 of this shaft. Thanks to this arrangement, when the screwdriver is mounted and is in its normal position similar to that of FIG. 1, a vertical shock exerted on the the handle of the screwdriver is transmitted directly to the blade 3, without in any way affecting the pawl 35.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=9462322

Family Applications (1)

Country Status (5)

Families Citing this family (12)

Family Cites Families (9)

• 1994
  • 1994-04-20 FR FR9404741A patent/FR2718991B1/fr not_active Expired - Fee Related
• 1995
  • 1995-04-20 WO PCT/FR1995/000521 patent/WO1995029041A1/fr active IP Right Grant
  • 1995-04-20 US US08/553,491 patent/US5816119A/en not_active Expired - Fee Related
  • 1995-04-20 EP EP95918039A patent/EP0706442B1/de not_active Expired - Lifetime
  • 1995-04-20 DE DE69503453T patent/DE69503453T2/de not_active Expired - Fee Related

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events