WO1997036714A1

WO1997036714A1 - Self-locking spanner

Info

Publication number: WO1997036714A1
Application number: PCT/DE1997/000570
Authority: WO
Inventors: Gernot Hirse
Original assignee: Gernot Hirse
Priority date: 1996-03-29
Filing date: 1997-03-21
Publication date: 1997-10-09
Also published as: DE19612751C2; DE19612751A1

Abstract

A pivoting clamping jaw (5) is mounted on a grip (1) of a self-locking spanner. The jaw bearing comprises two lateral faces (4) at a distance from one another and a pivot bracket (6) mounted on a pivot pin (7) and capable of pivoting relative to the faces (4). When the pivoting clamping jaw (5) is wide open, clamping engagement occurs between a clamping section (11) of the faces (4) and a clamping section (12) of the pivot bracket (6) between the faces (4). The pivoting clamping jaw is thus held in its wide open position and can be easily removed from a clamped object.

Description

Self Clamping Wrench

The invention relates to a self-clamping wrench with a handle on which a pivotable clamping jaw is mounted, the jaw bearing having two side cheeks arranged at a distance from one another and a joint plate which is mounted on a hinge pin between the two cheeks and can be pivoted relative to the cheeks.

Such wrenches, which are used depending on the design of their jaw surfaces as wrenches, pipe wrenches or a combination thereof, have the advantages over fixed or adjustable wrenches on the one hand, and over pliers, on the other hand, that the wrench is based on the diameter to be tightened or the wrench size to be tightened automatically sets and that the required clamping force is automatically applied by moving the handle in the clamping direction. Since the clamping force is released again when the handle moves in the opposite direction to the clamping direction, such clamping keys can be used in a ratchet-like manner.

In a known self-locking wrench of the type mentioned at the beginning (US Pat. No. 4,651,597, FIG. 18), the pivotable clamping jaw is constantly pressed into its clamping position by a leaf spring attached to the handle. This ensures that the self-locking effect of the swiveling clamping jaw is used as soon as the handle is swiveled in the clamping direction. A disadvantage of such a wrench, however, is that the wrench can be operated with one hand for the clamping process, but that an intervention is required to release the wrench, for which a second hand is often required; often a hand to the mother or the like. be introduced, which in many cases is not possible due to space constraints. In the known clamping wrench mentioned, it is necessary, for example, to open the pivotable clamping jaw by hand against the force of the leaf spring in order to be able to remove the clamping wrench. Especially with serrated wrenches that allow a ratchet-like movement in 15 steps, it is difficult or even impossible to remove the wrench without manual intervention, since the self-locking wrench is held by its teeth and the self-clamping increases when you try to remove it.

In other known self-clamping wrenches (US Pat. No. 4,651,597, FIG. 3; US Pat. No. 4,616,534), the actuation of a lever mounted on the handle is required in order to release the pivotable clamping jaw. Especially in those cases in which the use of a self-clamping wrench is advantageous, namely in difficult to access places, this advantage is canceled out again by the need to operate a lever on the wrench to release or to move the swiveling jaw back by hand.

The object of the invention is therefore to design a toothed, self-clamping wrench of the type mentioned, in particular also a toothed wrench that can be ratcheted in 15 ° steps, in such a way that it can be released solely by the movement of the handle. This object is achieved according to the invention in that, in a wide open position of the pivotable clamping jaw, there is a clamping engagement between a clamping section of the cheeks and a clamping section of the joint plate located between them.

This clamping engagement takes place automatically as soon as the pivotable clamping jaw is pivoted into its wide open position. This is done in that the wrench is moved by means of its handle against the clamping object, for example against a nut or tightened with the wrench

Pipe fitting. The swiveling jaw is swiveled towards the handle and opened. Even if a spring is usually provided on the wrench which presses the pivotable clamping jaw into its clamping position, the pivotable clamping jaw remains in its open position because there is a clamping engagement between the handle and the pivotable clamping jaw. The self-locking that occurs during this clamping engagement keeps the pivoting jaw in its wide open position. In this position the wrench can be withdrawn. In order to bring the wrench back into its clamping position or starting position, it is sufficient to swivel the swiveling clamping jaw again in the direction of its clamping position, the swiveling joint plate coming out of clamping engagement with the cheeks.

The invention can be used with different wrenches. It is immaterial whether the two cheeks are connected to the handle and the articulated plate is connected to the pivotable clamping jaw or whether the pivotable clamping jaw has the two cheeks which receive the articulated plate connected to the handle between them. According to a preferred embodiment of the invention, it is provided that at the clamping section of the cheeks the mutual distance between the cheeks in the direction of the opening movement is reduced to a dimension that is less than the thickness of the joint plate. The hinge plate is then clamped in the tapered area to achieve the clamping engagement between the two cheeks.

The clamping section of the cheeks can be formed by the mutually facing inner sides of the cheeks or by a clamping piece attached to the cheeks. Accordingly, the clamping section of the joint plate can be formed by the outer sides of the joint plate or by a clamping piece attached to the joint plate.

Further advantageous embodiments of the invention are the subject of further dependent claims.

Exemplary embodiments of the invention are illustrated below, which are shown in the drawing. It shows:

1 is a self-clamping wrench, partly in a longitudinal section, in a tight clamping position,

1 in a wide open position, wherein the pivotable jaw is in clamping engagement with the handle,

3 shows a section along the line III-III in FIG. 2,

4 shows a modified embodiment in a representation corresponding to FIG. 3,

5a) -d) are schematic partial representations for different versions of the clamping engagement between the pivotable clamping jaw and the handle, Fig. 6-13 each in a partial longitudinal section different embodiments of self-clamping wrenches, in which a clamping engagement takes place in a wide open position.

The self-clamping wrench shown in Figs. 1-3 has a handle 1 which is rigidly connected to a fixed jaw 2. In its section adjoining the fixed clamping jaw 2, the handle 1 is divided by a longitudinal slot 3 into two side cheeks 4 arranged at a distance from one another.

A pivotable clamping jaw 5 projects with a joint bracket 6 into the longitudinal slot 3 between the two cheeks 4 and is supported there in a joint pin 7 connecting the two cheeks 4. A leaf spring 8a is attached at one end to the handle 1, for example with a rivet or pin 9, and projects into the longitudinal slot 3. With its other rounded end 8b, the leaf spring 8 lies against the rear side 5a of the pivotable clamping jaw 5 and presses this towards its narrowest clamping position, which is shown in Fig. L. It is thereby achieved that the preferably toothed clamping surfaces 2a and 5b of the clamping jaws 2 and 5 rest against the clamping object 10, for example a hexagon or a round part.

If the handle 1 is pivoted clockwise in the position shown in FIG. 1, the clamping jaw 5 engages the clamping object 10 in a self-clamping manner. If the handle 1 is pivoted in the opposite direction, the clamping of the clamping jaw 5 is released, so that a ratcheting movement can be carried out with the clamping key. So that the wrench can be removed from the clamping object 10, the pivotable jaw 5 must be in its open Position (Fig. 2) are held. So that this can be done without manual intervention on the pivotable clamping jaw 5, provision is made for the pivotable clamping jaw 5 to be clamped in the open position according to FIG. 2.

In the embodiment shown in Figs. 1-3, this clamping engagement is achieved in that the mutual distance between the cheeks 4 in the direction of the opening movement in a cleram section 11, which is indicated in each case with a cross hatching reduced, which is less than the thickness of the hinge plate 6. In this clamping section 11, which in the example according to FIGS. 1 to 3 is formed by a tapering section of the longitudinal slot 3, the respectively assigned clamping section 12 of the hinge plate 6 is in the wide open position of the wrench clamped and held. To produce this clamping engagement, it is sufficient to press the clamping key with its pivotable clamping jaw 5 against the clamping object 10 in the manner shown in FIG. 2. In this open, clamped position, the clamping key can be removed from the clamping object 10. In order to bring the clamping key back into its starting position, the pivotable clamping jaw 5 is released from its clamping engagement by hand and pivoted towards the fixed clamping jaw 2.

1-3, the clamping section 11 of the cheeks 4 is formed by the mutually facing inner sides of the cheeks, this clamping section 11 is formed in the embodiment of FIG. 4 by a clamping piece 13 attached to the two cheeks 4, the Hinge plate 6 facing opening, the clamping portions 11. In reverse of the embodiment shown in FIG. 4, the clamping section 11 of the joint plate 6 can also be formed by a clamping piece attached to the joint plate. In Fig. 5a) -d) some possibilities are schematically shown how the clamping engagement between the hinge plate 6 and the cheeks 4 is formed.

Fig. 5a) shows the situation in the embodiment of Fig. 3. Here, the clamping section of the cheeks 4 is formed by the two opposing, tapering inner sides of the cheeks 4. The outer sides of the hinge plate 6 run parallel to one another and form their clamping sections 12 in the areas which are clamped between the cheeks 4.

While in the example according to FIG. 5 a) the two mutually facing inner sides of the cheeks 4 run obliquely in the area of the clamping sections 11, the embodiment according to FIG. 5 b) shows that, for example, only one of the two inner sides of the cheeks 4 in the area of the clamping section 11 can be carried out obliquely, while the surface forming the opposite clamping section 11 is straight, ie runs parallel to the outer surface of the Glenklasche 6.

In reverse of the embodiment shown in Fig. 5a), it can also be provided according to Fig. 5c) that the two inner surfaces of the cheeks 4 also run parallel to one another in the region of the clamping sections 11, i.e. the longitudinal slot 3 has an unchanged width over its entire length. Instead, the two outer surfaces of the hinge plate 6 are wedge-shaped in the area forming the clamping section 12 in order to achieve the required clamping engagement between the cheeks 4.

Deviating from this, it is shown in Fig. 5d) that the clamping sections 12 on the outer sides of the hinge plate 6 are formed by relatively flat projections 14 become, which cause a clamping between the inner surfaces of the cheeks 4. Instead, such projections 14 can also be provided on the inner sides of the cheeks 4. In addition, numerous other embodiments are possible, which have in common that the pivotable jaw 5 in its wide open position comes into clamping engagement with the cheeks 4 of the handle 1 to the pivoting jaw 5 in spite of the force of the leaf spring 8 acting on it in the open Hold position.

6-13 shows the implementation of this principle in different embodiments of self-clamping wrenches, the clamping section 11 of the cheeks 4 being indicated schematically with cross hatching for each. It goes without saying that, in the sense of the previous explanations, the clamping sections of the cheeks 4 and / or the joint plate 6 can also be designed differently from this exemplary embodiment. Parts which are essentially the same in function as the corresponding parts in the example according to FIGS. 1-3 are identified by the same reference numerals in FIGS. 6-13.

Instead of the previously described leaf spring 8, a helical compression spring 15 is accommodated in a spring bore 16 of the handle 1 in the embodiments according to FIGS. 6 and 7. The spring 15 presses on the pivotable clamping jaw 5 via a pressure piece 17. The clamping jaws 2 and 5 are also provided with toothed clamping surfaces 2a and 5b in the example according to FIG. 6. 7 has multiple-surface clamping surfaces 2a and 5b on the clamping jaws 2 and 5, so that the clamping key is designed in the manner of a partially open ring wrench only for a specific wrench size. 8-10, the pivotable clamping jaw 5 is connected to the two cheeks 4. The front section of the handle 1, which is mounted there on the hinge pin 7, projects into the slot 3 formed between the two cheeks 4.

On the pivotable jaw 5, the further jaw 2 is slidably guided in a guide 18.

In the examples according to FIGS. 8 and 9, a thumb 19 rigidly connected to the handle 1 engages in a recess 20 which is connected to the clamping jaw 2. By pivoting the handle 1 relative to the jaw 5, the jaw 2 is thereby displaced.

In the example according to FIG. 8, a helical compression spring 21 supported between the cheeks 5 presses the clamping jaw 2 in the direction of its narrowest position. In the example according to FIG. 9, this function is performed by a leaf spring 22 which is fastened to the handle 1 and presses on an extension of the clamping jaw 2.

The section of the handle 1 projecting into the longitudinal slot 3 between the cheeks 4 forms the hinge plate 6, the clamping section 12 of which, in the manner already described, comes into clamping engagement with the associated clamping section 11 of the cheeks 4 when the key mouth is opened the most.

The embodiment of FIG. 10 differs from the embodiment of FIG. 9 essentially in that the thumb 19 connected to the handle 1 presses from above onto a section connected to the clamping jaw 2 and guided in the guide 18 in order to open the key mouth . One comes in the clamping position 97/36714 PCΪ7DE97 / 00570

- 10 -

Toothing 23 on the back of this extension with a toothing 24 on the joint plate 6 of the handle 1 for engagement.

11 differs from the wrench according to FIGS. 1-3 essentially only in that the jaw 2 is not firmly connected to the handle 1, but is pivotally mounted on a hinge pin 25. The hinge plate 6 of the pivotable clamping jaw 5 can perform a limited longitudinal displacement on the hinge pin 7. The two jaws 2 and 5 are supported on mutually facing guide surfaces 26 and 27. As in the example according to FIG. 1, a leaf spring 8, which is fastened to the underside of the handle 1, presses the pivotable clamping jaw 5 towards its narrowest position.

The embodiment according to FIG. 12 differs from this only in that the spring acting on the pivotable clamping jaw 5 is a helical compression spring 15 as in the example according to FIG. 6.

In the example according to FIG. 13, the pivotable clamping jaw 5 is connected to the two cheeks 4, which between them accommodate the joint plate 6 of the handle 1, which is mounted on the joint bolt 7. The clamping jaw 2 is guided with guide pins 28 and 29 in a guide slot 30 or 31 of a front extension 6a of the joint plate 6 or in the cheeks 4. A tension spring 32 pulls the rear portion of the jaw 2 towards the pivotable jaw 5 so that it is moved towards its narrowest position. As with all other exemplary embodiments, the clamping engagement between the joint plate 6 and the cheeks 4 takes place in the region of the clamping sections 11 and 12, respectively, when the pivotable clamping jaw 5 is in its most open position, which is shown in FIG. 13.

Claims

Patent claims

1. Self-clamping clamping spanner with a handle on which a pivotable clamping jaw is mounted, the jaw mounting having two side cheeks arranged at a distance from one another and a hinged flap mounted between the two cheeks on a pivot pin and pivotable relative to the cheeks, characterized in that in In a wide open position of the pivotable clamping jaw (5), a clamping engagement takes place between a clamping section (11) of the cheeks (4) and a clamping section (12) of the joint plate (6) located between them.

2. A wrench according to claim 1, characterized in that on the clamping portion (11) of the cheeks (4) the mutual distance between the cheeks (4) in the direction of the opening movement is reduced to a dimension which is less than the thickness of the joint plate (6 ).

3. Wrench according to claim 1, characterized in that the clamping section (11) of the cheeks (4) is formed by the mutually facing inner sides of the cheeks (4).

4. A wrench according to claim 1, characterized in that the clamping section (11) of the cheeks (4) is formed by one of the cheeks (4) attached clerus piece (13).

5. A wrench according to claim 5, characterized in that the clamping section (12) of the hinge plate (6) from the outer sides of the hinge plate (6) is formed.

6. A wrench according to claim 1, characterized in that the clamping section (12) of the hinge plate (6) is formed by a clamping piece attached to the hinge plate (6).

7. A wrench according to claim 1, characterized in that the hinge plate (6) is connected to the pivotable clamping jaw (5) and protrudes between the cheeks (4) connected to the handle (1).

8. A wrench according to claim 1, characterized in that the hinge plate (16) is connected to the handle (1) and protrudes between the cheeks (4) connected to the pivotable clamping jaw (5).