WO1995026259A1

WO1995026259A1 - Self-locking pliers

Info

Publication number: WO1995026259A1
Application number: PCT/SI1995/000007
Authority: WO
Inventors: Peter Kunstelj
Original assignee: Peter Kunstelj
Priority date: 1994-03-25
Filing date: 1995-03-21
Publication date: 1995-10-05
Also published as: SI9400147B; AU1965695A; SI9400147A

Abstract

The self-locking pliers foreseen for temporary positioning and jointing of the sections clamped in at a determined angle (α) are designed by means of appropriate gripping handles (2, 3), the lock-release lever (4), the screw (4) for setting the gap, the mutual lever connection; the jaw (6) is derived from the bracket (8) which is rigidly connected with the handle (2) and at the free end of which two support sections (10) are rigidly mounted on the cross-piece; the support sections (10) are spread apart and they form between themselves the angle (α); the second jaw (7) is designed as the bracket (11) which reaches approximately up to the half length of the bracket (8) and at the free end of which a fork element (12) is rotatably mounted; the fork element (12) is designed as a two-legged section - V-form; between its legs (13) the pivot (14) is designed; this is embedded at the end of the bracket (11); the legs are elongated toward the front with free parts (13'), and they end in the area of the support sections (10).

Description

Self-locking Pliers

The subject of the invention is self-locking pliers, foreseen predominantly for

temporary jointing of two or more objects during a working process, e.g.

during mutual screwing, rivetting and especially welding.

The technical problem to be solved by the pliers as of the invention, is how to

make a hand tool, which would enable temporary but exact angular

positioning and jointing of two equal or different sections in L- or T- form

joint, taking into account that the procedure of the temporary jointing and

opening of the pliers shall be carried out with one hand only, and that the

automatic establishment of an equal clamping power of both sections shall be

provided, and around the joint of both sections there shall be enough space for unhindered access to the joint of both sections with other tools, e.g. a

welding machine.

There are various types of self-locking pliers, the common characteristics of

which is that they enable temporary jointing of mutually parallel or by- passing sections. Above all, these pliers are designed for jointing flat or angular bars (sections) in welding or rivetting. The jaws are of various forms so that they can clip variously shaped sections and joint them on parallel

contact section surfaces.

For the purpose of jointing L- and T- shaped sections various cramps and

vices are available. The disadvantage of these two tools is, that they require

both-hands work. Therefore, it is frequently impossible for one worker to joint

sections by himself, without any assistance of co-workers. An even greater

disadvantage is the fact that they do not provide enough space around the joint

for the access of other tools. However, the greatest disadvantage of these tools

is shown in electro-welding, and even more in autogenous welding.

The invention solves the described technical problem by means of a new

construction of the self-locking jaws. One of the jaws serves as a support for

both jointed sections, so that this support determines their exact position and

angle, preferably the right angle. The second jaw is of two parts. The lever

part which is connected to the gripping handle, has a shape of a pivot and a

freely turnable fork-shaped part is mounted on it. The fork part fits with its

legs to the support of the first jaw, i.e. to both clamped objects, and its

rotatability ensures an automatic establishment of the same clamping force of

both sections, disregarding their outside dimensions and shape. The two legged support jaw with a gap between the legs, and the fork-shaped

turnable part of the second jaw ensure a sufficient space in the area of the

joint of L- and T-sections, so that the access with other tools to the joint of

both objects is unhindered.

As to the rest, e.g. both gripping handles, lock-release lever, the screw for

setting the gap between the jaws and the mutual connection of all parts, the

self-locking pliers are made in the usual way.

In more detail the invention is explained by means of a description of three

embodiments of construction, and the drawing appended, in which the same

parts in different pictures are marked with the same reference numbers. The

drawing presents:

«

Fig.1 the first embodiment of the pliers in a side view;

Fig.2 the pliers front view as of Fig. 1;

Fig.3 another embodiment of the pliers in a side view;

Fig.4 the pliers front view as of Fig. 3;

Fig.5 the third embodiment of the pliers in a front view.

The self-locking pliers as of the first embodiment are derived from the known

self-locking pliers 1 with appropriate gripping handles 2,3, lock-release lever 4, screw 5 for setting the jaw gap, and appropriate mutual lever connections.

The jaws 6 and 7 are modified; the jaw 6 is designed as a support of the

clamped objects (not shown in the drawing) and it consists of the bracket 8

which is rigidly connected with the handle 2 and at the free end of which the

support sections 10 are rigidly mounted on the cross-piece; they are spread

apart and symmetrically to the bracket 8, they form an angle α which is to be

taken by the objects clamped-in. This angle α is predominantly the right angle

(that means 90°), because it is most frequently used. The angle α can be also

of some other type, for it does not change the essence of the invention.

The second jaw 7 functions as a pressing element and it is connected with the

links to the handles 2 and 3 and the lever 4. The jaw is designed as a bracket

11 which reaches up to approximately half length of the bracket 8. At the free

end of the bracket 11 the fork-shaped element 12 is mounted so, that it can

rotate. This element is designed as a two -legged section - V-form ; the pivot

14 is designed between its legs; it is embedded at the end of the bracket 11.

The legs 13 of the element 12 are elongated toward the front with their free

parts 13' and they end in the area of the support section 10 with the pressing

points 15. The rotability of the element 12 in the pivot 14 enables, that both

pressing points 15 fit closely also to the clamped-in objects of different

dimensions and they press them with an equal power onto the support sections

10 of the jaw 6. The shorter bracket 11 in comparison with the bracket 8, two support sections

10 with a spacing between them and the shape of the fork element 12 enable

an unhindered positioning of any objects to be clamped in the jaws, namely

in L- or T-joint, and they allow access of other tools to the clamped-in objects

at their joint .

The self-locking pliers as of another embodiment are the same as those

presented in the first embodiment with a difference, that the support sections

10 of the jaw 6 are designed as angle bars. This enables and provides the same

level position of both bar-shaped objects of round or multi-sided cross- sections to be clamped-in with regard to the shape of their cross-section as

well as the foreseen mutual angle.

In this case the fork element 12 is designed only with the elongations 13' of

« the legs 13 which project over the support sections and which end freely

without any pressing points.

The self-locking pliers as of the third embodiment are equal to those of the afore mentioned embodiments with a difference, that the support sections 10

mounted on the bracket 9 are mutually turnable, so that they enable the setting

of the angle of the joint of the objects to be clamped in. The rotatability of both section 10 is designed so, that both support sections

10 are mounted on the two-piece bracket 9, the legs of which are rotatably

embedded in the pivot 16, mounted on the bracket 8 and the fixing nut 17 of

which enables fixing of both sections 10 at a desired angle.

It shall be understood, that additional derivations for particular purposes can

be designed on the basis of the described forms of the invention construction.

So it is possible to modify the shapes of the support sections and the fork

element with regard to special forms of objects to be clamped in, especially

special angular sections, bars and tubes, and above all their mutual

combinations. Further it is possible to design a different mode of the mutual rotability of the support sections. However, it is evident, that all these forms

are derived from the described invention.

Claims

PATENT CLAIMS

1. The self-locking pliers which are designed with the gripping handles (2,3),

the lock-release lever (4), the screw (5) for setting the gap, the jaws (6 and 7)

and their mutual connection, characterized in that the jaw (6) is derived from

the bracket (8) which is rigidly connected with the handle (2) and at the free

end of which two support sections (10) are rigidly mounted on the cross-

piece; the sections are spread apart and they form between themselves an

angle (α); the second jaw (7) is designed as a bracket (11) which reaches up

to the approximate half length of the bracket (8) and at the free end of which

the fork element (12) is rotatably mounted; this element (12) is designed as a

two-legged section - V-form; between its legs (13) the pivot (14) is designed

which is embedded at the end of the bracket (11) and the legs (13) are elongated forwards with their free parts (13') and they end in the area of the

support sections (10).

2. The self-locking pliers as claimed in claim 1, characterized in that the legs

(13') of the fork element (12) end with the pressing points (15).

3. The self-locking pliers as claimed in claim 1, characterized in that the

support sections (10) of the jaw (6) are designed as angular sections.

4. The self-locking pliers as claimed in claim 1, characterized in that the

support sections (10) on the bracket (9) are mounted rotatably and the angle

(α) between the sections (10) is adjustable.