DE20012818U1 - Gripping pliers with adjustable jaw width - Google Patents

Description

Hans-Udo Erdmeier
Daniel-Schürmann-Str. 30
42853 Remscheid

Gripping pliers with adjustable jaw width

The invention relates to a gripping pliers as further characterized in the preamble of claim 1.

Such grippers are known from DE 100 31 343 Al and
DE 196 34 082 Al. Reference is expressly made to the detailed, basic functional description of the gripping tongs that can be found in this state of the art. /

In DE 100 31 343 Al it is known from Figure 4 that the operating area
of the locking pin with a correspondingly raised
Furthermore, the
EP 0 528 252 Bl known the one pliers leg on the operating side
of the hinge pin with a recess,
such that the recess serves as a support for the underside of the thumb during actuation, whereby the actuating end of the hinge pin is received in the recess during actuation due to the depth of impression of the thumb.

In the operating area, ie in the axial adjustment area of the locking pin/joint bolt, the pressure trough has a circumferential, concentric and raised, circular bead, in the case of the
Recess seen as a circumferential, concentric or oval contour to the locking pin/hinge bolt.

·

It has been proven that the circumferential bead or the circumferential recess does not adequately meet the ergonomic requirements of a corresponding thumb operation for the locking pin/joint bolt. Furthermore, there is no protection against damage and unintentional operation of the locking pin adjustment area.

Based on this problem, the invention is based on the aim of adequately protecting the actuation area of the locking pin/articulated bolt and to enable ergonomically sensible actuation of the locking pin.

The invention proposes essentially two measures for a generic pair of pliers:

Firstly, the raised bead is to be semi-circular in order to enable the correct ergonomic thumb operation , i.e. to be adapted to the front, U-shaped thumb contour area, open on one side, and secondly, the above-mentioned bead is to be raised in such a way that the complete axial adjustment path of the locking pin/joint bolt is covered, so that a raised bead is created which achieves considerable advantages in the handling of the above-mentioned pliers:

The bead described enables the ergonomically correct actuation of the locking pin during the adjustment process. Furthermore, the bead mentioned above prevents possible damage or unintentional actuation of the locking pin in the locked engagement position of the pliers joint.

· ■ ·

·

Since the locked engagement position corresponds to the usual working setting of the pliers of this type, this protective function is of particular importance.

Damage to the locking pin surface (e.g. due to impacts or if the pliers slip) is prevented by the described bead height, which in the above-mentioned case acts like a deflector. The undamaged surface of the locking pin across the entire adjustment range is of crucial importance for the easy adjustability of the pliers joint. Furthermore, the described bead height offers another protective function, namely the locking pin (which is held in the engagement position by relatively low spring pressure) is protected against accidental actuation. This accidental change in the locked engagement position would easily occur if the pliers were dropped, for example. The described raised bead forces the deliberate actuation of the locking pin and excludes all other accidents. This ensures robust, ergonomically sensible operation of the pliers of this type.

In a further development, the invention can also consist of segment-like sections which represent a described, raised and semicircular bead.

The drawing shows an embodiment of the invention, which will now be described in more detail.

Figure 1 shows a gripper in a top view of the joint.

Figure 2 shows the joint of the gripping tongs according to section II-II in Figure 1, on an enlarged scale.

Figure 1 shows a gripping pliers as a so-called water pump pliers in a top view. The gripping pliers 1 comprise a slotted pliers handle 2 and a pliers bow 3 which are each provided with a handle section 4 and 5. The pliers handle 2 and the pliers bow 3 cross each other within the slot 6 in a joint 7 which comprises a locking pin 8 and an elongated locking hole 9. The joint 7 is adjoined to the pliers handle 2 and the pliers bow 3 by a gripping jaw section 10 and 11 which together form a pliers mouth.

The described bead 12 is semicircular, arranged concentrically around the locking pin 8 and, for ergonomic reasons of the front thumb operation, is inclined by approximately 15° to the pliers vertical line Z. For better understanding, the bead 12 is shown blackened.

Figure 2 shows the joint 7 according to section II-II in Figure 1, but on a slightly larger scale. The pliers handle 2, which is slotted in this area, has the left area 2a and the right area 2b. The pliers bracket 3 is inserted or pushed through the slot 6 between the areas 2a and 2b. The locking hole 9 is elongated and consists of a series of several cylindrical holes, the centers of which are offset from one another by less than one hole diameter, so that there is a free passage between the respective holes, which is however smaller than the hole diameter. The locking pin 8 is mounted in the holes 9, 13 and 14. The locking pin 8 is designed as a rotationally symmetrical, one-piece turned part which has an outer, rounded pressure surface G.

In the engagement position shown, the joint 7 is immovable in the longitudinal direction Y-Y of the locking hole 9, the locking pin 8 forms the fixed bearing and pivot axis X-X of the joint 7.

If the jaw width, i.e. the distance between the gripping jaws 10 and 11, is to be adjusted, the user presses, preferably with the thumb, on the pressure surface G in order to adjust the locking pin axially against the force of the compression spring 15 and along the adjustment path T. The adjustment path T corresponds to the immersion depth H of the locking pin 8 in the bore 13.

If the locking pin 8 is displaced according to the adjustment path T or the immersion depth H, the pliers handle 2 can be moved relative to the pliers bracket 3 because the thinner section of the locking pin 8 is located in the locking hole 9 and is guided by the
narrower areas of the locking hole 9. If the
When the appropriate jaw width is found, the locking pin 8 is released and together with its thicker section is moved back into the engagement position shown by the compression spring 15 and
held.

The raised, semicircular bead 12 corresponds in its
Height of the adjustment path T or the immersion depth H. Furthermore, the above-mentioned bead has a ratio
of approximately 3:1, ie the external diameter D of the bead 12 corresponds approximately to three times the diameter d of the locking pin 8. The height of the pliers joint B is designed symmetrically B/2 to the longitudinal direction YY of the pliers.

·

·

·

Claims (4)

1. Gripping pliers with a pliers handle ( 2 ) and a pliers bracket ( 3 ), each having a handle section ( 4 , 5 ) and an opposite gripping jaw section ( 10 , 11 ), wherein the pliers handle ( 2 ) and the pliers bracket ( 3 ) are mounted in a joint ( 7 ) so as to be pivotable relative to one another about the pivot axis (XX), and the joint ( 7 ) has an engagement position and an adjustment position. A manually, coaxially displaceable locking pin ( 8 ) is provided in the direction of the pivot axis (XX), which can be displaced against a compression spring ( 15 ) to set the engagement position and the adjustment position, wherein the locking pin ( 8 ) forms the bearing axis of the joint ( 7 ) in the engagement position and the locking pin ( 8 ) has a first region of larger diameter and a second region of smaller diameter. The pliers bracket ( 3 ) has an elongated locking hole ( 9 ) in which the locking pin ( 8 ) engages with its first, larger area in a rotatable and immovable manner and with its second, smaller area in a displaceable manner in the longitudinal direction (YY), and the locking pin ( 8 ) is mounted in a bore ( 13 , 14 ) in the pliers handle ( 2 ) and is supported by the compression spring ( 15 ) at the end of the bore ( 13 ), characterized in that the raised, semicircular bead ( 12 ) is designed concentrically to the center of the locking pin ( 8 ), the raised, semicircular bead ( 12 ) is inclined by approximately 15° to the pliers vertical (Z) and has a height which corresponds at least to the adjustment path (T) or the immersion depth (H). 2. Gripping pliers according to protection claim 1, characterized in that the raised, semicircular bead ( 12 ) ergonomically corresponds to the front, U-shaped thumb outline and the outer diameter (D) of the bead ( 12 ) corresponds to at least three times the diameter (d) of the locking pin ( 8 ). 3. Gripping pliers according to protection claim 1, characterized in that the entire height (B) of the pliers joint ( 7 ) is distributed symmetrically (B/2) to the longitudinal direction (YY) of the pliers. 4. Gripping pliers according to protection claim 1, characterized in that the raised, semicircular bead ( 12 ) can be formed from segment-like parts which are arranged concentrically to the center of the locking pin ( 8 ).