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
  • B25B13/00—Spanners; Wrenches
  • B25B13/44—Spanners; Wrenches of the chuck type
• • 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
  • B25B23/02—Arrangements for handling screws or nuts
  • B25B23/08—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation
  • B25B23/10—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation using mechanical gripping means

Definitions

• the present invention relates to a gripping and screwing end for fitting a screwing device such as, for example, a motorized screwdriver / unscrewer.
• the previously described solution provides a cooperation of a conformation of the jaws with an appropriate conformation of the sleeve to cause a tilting of the jaws around articulation means, when the jaws move from a forward end position where they are open to a rear end position in which the jaws are retracted into the socket in the closed position.
• these conformations involve ramps that extend obliquely with respect to the longitudinal axis of the bushing.
• the object of the invention is therefore more particularly to eliminate these disadvantages.
• a gripping and screwing tip comprising:
• a sleeve having, on one side, means for driving in rotation and, on the other side, a coaxial cavity opening outwards through a circular orifice
• a gripping mechanism movable axially inside said cavity, this mechanism comprising two jaws movable in translation, with respect to one another, in a radial plane,
• - Conversion means adapted to control the radial translation of the two jaws following an axial displacement of the gripping mechanism, so as to pass from an open position, in which the two jaws are spaced one of the other and stand outside the socket, at a closed position in which the two jaws are retracted and retracted into the socket,
• the two jaws may have an elongated body terminated, on one side, by a circular collar portion having the aforesaid conformations.
• One of the two jaws, female type may include a cylindrical body with an axial cavity of rectangular section.
• the other jaw may then comprise a body of parallelepipedal shape of section substantially complementary to that of the axial cavity in which it engages and can slide radially.
• This body also has a circular flange fraction which extends in line with that of the female-type jaw when the two jaws are in the retracted position.
• the aforementioned conversion means may in turn involve:
• two axially offset parallel radial pins passing through the cavity of the socket and engaging respectively in two pairs of coaxial bores provided in the socket, -
• at least two oblong holes radially through, respectively provided in each jaw these oblong holes being arranged to be two by two in coincidence and to define two radial passages through which engage respectively the two pins.
• Each of these oblong holes comprises an axial portion followed by an oblique portion, the oblique portions of two oblong holes in coincidence (through which the same pin passes) being oriented opposite to each other.
• the two jaws may also comprise at least two coaxial radial bores oriented perpendicular to said pins and in which engages a guide axis allowing a radial displacement in translation of the two jaws.
• a spring may also be provided, coaxially with this axis to generate on the two jaws a force tending to separate them from one another.
• the outer diameter of the collar portions of the jaws may be equal to the inside diameter of the sleeve so that in the retracted position of the jaws, the flange portions are at least partially tightly engaged in the sleeve.
• Figures 1 and 2 are two views in elevation, 90 ° to one another, a gripping and screwing tip according to the invention wherein the jaws are in the deployed position;
• Figure 3 is a section along AA 'of Figure 2;
• Figures 4 to 6 are views similar to those of Figures 1 to 3, but wherein the jaws are in the retracted position;
• Figure 7 is a perspective view of a female jaw
• Figure 8 is a side view of the jaw shown in Figure 7;
• Figure 9 is an end view on the flange side of the female jaw
• Figures 10 to 12 show a male jaw respectively in perspective (Figure 10), in elevation (Figure 11) and side end view flange (Figure 12);
• FIGS. 13 and 14 are views respectively in elevation (FIG. 13) and in axial section along BB 'of FIG. 13 (FIG. 14) of an alternative embodiment of a gripping and screwing bit according to the invention .
• Figures 15 and 16 show in perspective (Figure 15) and in end view ( Figure 16) a male-type jaw of the nozzle shown in Figures 13 and 14;
• Figures 17 and 18 show in perspective (Figure 17) and in end view (Figure 18) a female-type jaw of the nozzle shown in Figures 13 and 14;
• Fig. 19 is a schematic representation showing the position of the polygonal section of the screw head in the fingerprints of the jaw of the tip shown in Figs. 13-18.
• the gripping and screwing tip is intended for screws comprising a head 1, having a convex upper face 2 comprising in the center an injection bowl. The presence of this bowl exists only in the case where the head is overmolded.
• the upper face of the head 1 will be continuously curved.
• the peripheral edge 3 of the head 1 is serrated and here comprises fifteen teeth separated by notches forming an angle of about 120 °.
• This head 1 is connected to a coaxial rod 7 via a cylindrical portion under head 8 whose diameter is substantially equal to the distance between the bottom of the notches and the axis XX 'of the screw.
• the height of the cylindrical portion 8 is substantially equal to the height of the peripheral edge 3 of the head 1.
• the diameter of the rod 7 of the screw at its connection to the cylindrical portion 8 is much smaller than that of the head 1 (about 50%), the connection between the cylindrical portion 8 with the peripheral edge 3 of the head 1 and with the end of the rod 7 being effected by means of radial shoulders.
• the rod 7 of the screw has a self-tapping thread 4 terminated by a self-piercing tip 5.
• the invention is not limited to a particular type of net or tip.
• This screw can be screwed using a hand tool having a tubular nozzle whose inner profile corresponds to the outer serrated shape of the head 1. Nevertheless, it is particularly suitable for the screwdriver tip illustrated in Figures 1 to 12 which essentially comprises a tubular sleeve 10 closed on one side by a circular base 11 secured to a coaxial rod 12 partially hexagonal section, intended to engage in the mandrel of a screwdriver.
• This socket 10 delimits a coaxial cylindrical cavity 13 opening outwardly opposite the bottom 11.
• the cylindrical wall of this cavity 13 is smooth and does not include any projecting element such as for example, a ramp.
• an axially movable gripping mechanism 14 which comprises two jaws 15, 16 one of which is of the male type, while the other 16 is of the female type.
• the male-type jaw 15 has an axially elongated parallelepipedal body 17 comprising a cylindrical lateral side 18.
• This body 17 is extended, at one of its ends, by a flange fraction 19 which extends coaxially with the lateral side 18 projecting relative thereto and which has an outside diameter substantially equal to the inside diameter of the sleeve 10.
• This flange fraction 19 comprises successively, starting from the body 17, in the axial direction:
• toothed portion 20 in the shape of a crown sector, this serrated portion being substantially complementary to the serrated peripheral edge of the head 1 of the screw, and
• the face of the body 17 adjacent to the collar 19 has a step 22 forming a recess with a circular profile.
• the female-type jaw 16 (FIGS. 7 to 9) comprises a substantially cylindrical body 23 of the same length as the body 17 of the male-type jaw 15.
• This body 23 is provided with a parallelepipedal axial cavity 24 substantially complementary to the body 17 of the jaw 15 of the male type which is intended to be housed therein.
• the body 23 is extended, on one side by a flare 25 in the form of fillet, itself axially extended over a part of its periphery by a flange fraction 26 similar to that of the jaw 15 of the male type and comprising a analogously a toothed portion 20 'and a cylindrical smooth portion 21'.
• This flange fraction 26 is centered opposite the axial opening of the cavity 24 so that when the body 17 of the male-type jaw 15 is engaged in the cavity 24 of the body 23 of the jaw 16 of the female type, the two flange fractions 19, 26 face each other and are inscribed in the same outer circle.
• the internal volume of the bushing 10 is traversed by two axially offset radial pins 30, 31, the ends of which engage in corresponding bores provided in the bushing 10.
• the male-type jaw 15 comprises two oblong through-holes 32, 33 made between the two main faces of the body 17.
• the jaw 16 of the female type comprises two pairs of coaxial oblong holes 34, 34 '- 35, 35' radially through which open into the two opposite faces of the axial cavity 24.
• the oblong holes 32 to 35 and 34 ', 35' each comprise a portion P 1 which extends axially and a portion P 2 which extends obliquely with respect to the longitudinal axis of the sleeve 10.
• the oblique portions P 2 oblong holes of the same jaw extend parallel to each other.
• the oblique portions P 2 of the oblong holes 32, 33 of the jaw 15 of the male type are oriented opposite the oblique portions P 2 of the oblong holes 34, 35 - 34 ', 35' of the jaw 16 of the female type.
• the bodies 17, 23 of the jaws 15, 16 of the male and female type have two radial through holes 40, 41 oriented perpendicularly to the pins and in which an axis is engaged for axially securing the two jaws 15, 16 while allowing their radial translation.
• a spring 42 disposed coaxially with the axis then exerts on the jaws a force tending to open them.
• the operator can then proceed to screw the screw.
• the operator exerts an axial traction on the tip, which causes a displacement of the jaws 15, 16 in opposite direction and their passage in the deployed position with disengagement of the head 1 of the screw.
• This solution is particularly effective and allows for gripping tips with a high compactness.
• the pins cooperate only with the axial portions of the oblong holes, so that a process of inadvertent deployment of the jaws (due to the reversibility of a ramp assembly) can not occur.
• FIGS. 13 to 19 illustrate a variant of the gripping and screwing bit according to the invention that can be used for screws 50, the head 51 of which has a cap 52 possibly curved, terminated by a conical crown and, under this cap, a portion under head 53 of polygonal section, preferably six or eight sides, which extends coaxially with the screw.
• the elements of the nozzle 54 are strictly identical to those of the nozzle described above, with the exception of the collar portions 55, 56 which, in this case, extend over nearly 180 ° (approximately 170 °) and which each comprise, successively, from the body 57, 58 of the jaws: an annular cavity 59 (FIG. 17) which extends over a fraction of circumference with a diameter substantially equal to the diameter of the cap 52 of the head 51 of the screw 50; this annular cavity may comprise a conical shape substantially complementary to the conical crown of the cap 52 of the head 51 of the screw 50, and
• an imprint 60 comprising two facets 61, 62 extending at 90 ° from each other and arranged symmetrically with respect to a bisecting plane passing through the axis of the endpiece, this bisecting plane constituting a plane of symmetry also for the annular cavity 59.
• this socket is similar to that of the sleeve described above.
• the head 51 of the screw 50 is engaged between the collar portions 55, 56 of the jaws, and then an axial pressure is exerted on the latter.
• This pressure causes a displacement in translation of the jaws inwardly of the sleeve 63 of the nozzle with passage in the retracted position.
• the two facets 61, 62 of each recess 60 are applied to a pair of corresponding flaps of the under-head portion 53 of the screw 50, thus performing a self-centering of the head 51. of the screw 50 relative to the socket.
• the flange fractions 55, 56 engage at least partially inside the sleeve 62 and are then locked radially.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
• Surgical Instruments (AREA)
• Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)
• Earth Drilling (AREA)
• Dowels (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (2)

Family

ID=39874052

Family Applications (1)

Country Status (6)

Families Citing this family (2)

Family Cites Families (5)

• 2008
  • 2008-03-13 FR FR0801371A patent/FR2928574B1/fr active Active
• 2009
  • 2009-02-26 EP EP09728518A patent/EP2265411B1/de active Active
  • 2009-02-26 ES ES09728518T patent/ES2369067T3/es active Active
  • 2009-02-26 PL PL09728518T patent/PL2265411T3/pl unknown
  • 2009-02-26 WO PCT/FR2009/000219 patent/WO2009122025A1/fr active Application Filing
  • 2009-02-26 AT AT09728518T patent/ATE514529T1/de not_active IP Right Cessation

Non-Patent Citations (1)

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