FR2679165A1 - HAND TOOL HAVING A RECOVERY LIMITATION DEVICE. - Google Patents

Abstract

In this tool comprising two elements (6, 7) to be brought together, a first (6) of the two elements carries, on its internal face, a device (9) for limiting the approximation of the two elements directed towards the second element (7) and having variable length. This device comprises a screw-nut system, one member (10) of which is fixed to the first element, the female member (11) of this screw-nut system being split longitudinally and the limiting device comprising a brake (17) movable, on this female organ, between an active position in which it clamps the female organ on the male organ, and a position of release of the female organ. Application to pliers, shears, circlip spreaders, etc.

Description

The invention relates to a hand tool, of the type comprising

two moving parts

  In relation to each other, at least one of these

  It is used for many cross-branch tools, such as various types of pliers, cable cutters, shears

  sheet metal, secateurs, etc., or juxtaposed branches

  such as circlip retractors, and also to tools in which one of said elements is a frame and the other a handle movable relative to this frame. The object of the invention is to provide simple and convenient means making it possible to limit the approximation of said elements of the tool to a predetermined value. To this end, the object of the invention is a tool of the aforementioned type, characterized in that first

  of the two elements carries, on its internal face, a

  the limitation of the approximation of the two

  given to the second element and having a

  variable device, this device comprising a screw-nut system which a member is fixed to the first element, the female member of this screw-nut system being split

  longitudinally and the limitation device

  taking a mobile brake, on this female organ, between an active position in which it squeezes the organ

  female on the male organ and a position of libera-

of the female organ.

  According to other characteristics, the movable member of the screw-nut system is knurled; the brake is screwed onto said female member; the brake is constituted by a ring with a conical inner surface mounted axially movable on a portion with a conical outer surface of said

female organ.

  the brake has a knurled outer surface; the limiting device is located approximately on the axis of the effort of bringing the two elements together; when said second element has a

  flexible coating, this coating is sup-

  awarded in the abutment region of the limiting device

  tion; the fixed member of the screw-nut system is fixed to said first element by force engagement of two nets of different pitch; the fixed member of the screw-nut system is

  come from matter with said first element.

  Exemplary embodiments of the invention

  will now be described with reference to the

  in which: Figure 1 shows a clamp confomre the invention;

  Figure 2 is a sectional longitudinal view of

  tudinal device limiting the approach of this clamp; and Figures 3 to 5 are respectively

  views similar to Figure 2 of three variants.

  The clamp shown in Figure 1 comprises two crossed arms 1, 2, steel articulated

  to one another around an axis 3 These branches

  on one side of the axis 3 a jaw, respectively

  4, 5, and on the other side a handle, respectively

  6, 7 The handles are provided on most of their length with a coating 8 of flexible plastic material The clip further comprises a device 9 for limiting the approximation of the two handles, this device thus serving, in this example, to limit

  the approximation of the two jaws 4 and 5.

  The device 9 comprises a screw-nut system consisting of a threaded rod 10 and a nut 11 The rod 10 is fixed by one end to the face

  inside the first handle 6, about half way

  length and extends approximately

  culairement to the plane of symmetry P of the tool which passes through the axis 3 towards the second handle 7 The fixing of the rod 10 is made by cutting a window in the coating 8 and screwing the rod 10, to through this window, in a tapped hole following a different step in the internal face

of the handle 6.

  As can be seen in FIGS. 1 and 2, the nut 11 comprises an externally knurled body 12 whose end face 13 facing the branch 7 is curved. This body, which can be internally

  smooth or threaded, presents to branch 6 a prolongation

  tubular assembly 14 threaded internally and externally

  This extension 14 is provided, from its free end, with a plurality of longitudinal slots 15, and it presents to the same

  end a conical outer surface 16.

  Device 9 is completed by a counter

  locking nut 17 freely threaded on the rod 10,

  screwed onto the extension 14 and having an interior

  at the end closest to the branch

6, a conical surface 18.

  To limit to a chosen value the

  close to the handles 6, 7, the counter is unscrewed.

  nut 17 to branch 6 to loosen the extension

  14 of the nut 11, and this screw is screwed or unscrewed.

  deny, on rod 10, to the corresponding position

  Then screw the locknut onto the extension

  until the cooperation of both

  these cones 16 and 18 causes the clamping on the rod 10 of this extension 14- Thus, when the clamp is tightened with one hand, the abutment of the surface 13 of the nut 1 I on the face

  handle 7 defines the maximum approximation

  wrong of the two handles To ensure the accuracy of the stop, the flexible coating 8 of the handle 7 is

  deleted, in 19 (Figure 1), in the abutment region.

  Note that the device 9, disposed between the two handles, does not increase the size of the handle Thus, if the hand in which the clamp is accessing the workplace, then the clamp can access the workplace, and what

whatever the setting of the stop.

  In addition, the device 9 allows a "one-handed" adjustment, with the thumb of the hand holding the clamp The softness of the operation of the nut 11

  can be adjusted with the thumb by

  In addition, the axis of the rod 10 is located in the hollow of the hand, and is very close to the axis of the closing force of the tool.

  very straightforward abutment, little solicited because of the ab-

  the multiplication of effort on its axis, and which greatly reduces the phenomenon of "flexibility" due to

  the intrinsic flexibility of the two branches 6 and 7.

  Figures 3 to 5 show several variables.

rants of the device 9.

  In Figure 3, it is the female member or nut li A screw-nut system which is integral with the handle 6, and in this example, this body is integral with this handle The organ 11 A is split as previously in its free end portion and has the conical outer surface 16A at this

  end The tapered rod 1 OA is screwed

  in the nut 11 A and ends with a domed head 13 A intended to abut against the handle 7 The counter nut 17 A, freely threaded on the rod 10 A, is

  screw on the nut A and has the surface

  cone 18 A opposite the surface 16 A. The variant of Figure 4 differs from that of Figures 1 and 2 only by the realization of the brake: instead of being constituted by a counter nut, this brake is realized in the form of a simple sliding ring 17 B This ring internally has a conical surface 18 B flaring towards the handle 6, and the conical surface 16 B of the extension 14 B of

  the nut 11 B flares in the same direction.

  axial displacement of the ring 17B causes the blocking or release of the nut 11 B. Similarly, the variant of FIG.

  differs from that of Figure 3 only by replacing it

  of the 17A lock nut by means of a simple sliding ring

  17 C This internally presents an over-

  conical face 18 C flaring towards the handle 7, and the conical outer surface 16 C of the nut li C flares

  in the same direction As before, the simple

  axial placement of the ring 17 C causes the blockage or

the release of the rod OC.

Claims (6)

  1 hand tool, of the type comprising two elements (6, 7) movable relative to each other, at least one of these elements constituting a handle, characterized in that a first (6) of the two elements   on its inner face, a device (9) for limiting   tation of the approximation of the two elements directed towards the second element (7) and having a variable length, this device comprising a screw-nut system of which a member (10; 11A) is fixed to the first element (6), the female member (11; li A; 11 B; 14 C) of this system   screw-nut being split longitudinally and the device   limiting device (9) comprising a brake (17; 17 A; 17 B; 17 C) movable on said female member between a   active position in which he squeezes the   on the male organ, and a position of liberation of the female organ.   2 tool according to claim 1, characterized in that the movable member (11) of the system screw-nut is knurled.   Tool according to claim 1 or 2, characterized in that the brake (17; 17 A) is screwed onto said female member (11; 11 A).   Tool according to claim 1 or 2,   characterized in that the brake (17 B; 17 C) is constituted   killed by a ring with a conical inner surface (18 B, 18 C) axially movable on a surface portion   outer conical (16 B, 16 C) of said female member. Tool following any of the   Claims 1 to 4, characterized in that the brake   (17, 17 A, 17 B, 17 C) has a knurled outer surface 6 Tool according to any one of   1 to 5, characterized in that the provision   limiting device (9) is located approximately on the axis   the effort of bringing together the two elements (6, 7).   7 Tool according to any of the   Claims 1 to 6 wherein said second element   (7) comprises a coating (8) of flexible material, characterized in that this coating is removed in the abutment region (19) of the limiting device (9), 8 Tool according to any one of   Claims 1 to 7, characterized in that the   fixed (10) of the screw-nut system is fixed to said first element (6) by force engagement of two threads of not different.   9 Tool according to any one of   Claims 1 to 7, characterized in that the   (11 C) of the screw-nut system has come from   with said first element (6).