DE1603930A1 - Screw wrench with changeable mouth width - Google Patents

Description

PATENTANWÄLTE 8902 augsburg-goggingen. May 12, 1967

v. Eidiendorff-Strasse 10

DR. ING. E. LIEBAU our symbol ρ 656? Br..Eb / p

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DIPLING. G. LIEBAU

, HRZezeichen 160393G

Your message from

Rudolf Hans Popper

17> Nassaulaan., Doorn, Belgium

Screw wrench with adjustable mouth width

The invention relates to a screw wrench with changeable Mouth width, which is automatically the size of the mother, is set on this, without any setting needs to be made while means are provided with which the mother in the correct position in the Key is brought and the opening of the key, once taken, can be recorded.

109848/0021

In general, when you open nuts of different sizes or want to unscrew, a whole set of keys is required available. There are keys for which the The mouth width can be adjusted. they are known under the name "Englishmen" - but on the one hand it is difficult to deal with such Keys to grasp the nut securely so that damage to the nut can easily occur by removing the edges of the planks are rounded, and on the other hand, the transition from one nut size to another requires a certain amount Time because the jaw width is adjusted by pressing a screw.

The present invention is intended to eliminate these disadvantages and a key can be specified, which is automatically assigned to the Adjusts the size of the nut to be moved by simply sliding it over the nut, while means are provided for to place the wrench exactly on the nut and to center it on the nut so that only one torque is exerted and no other stress can be exerted on the thread axis.

The key according to the invention is characterized above all by the fact that the head of the key has a number of lamellae normally enclosed between two jaws, that the central part of the head is formed as an expandable block consisting of two bars spread apart by _{F: e_dern} be stealing, with the

■ .- 109848/0024., - .., ■.-.-. -

The tip of the rod is bevelled in such a way that the block offers a V-shaped slot which serves as a guide for the nut to be inserted into the key, and that the expandable bioek has at least one axis to hold the lamellas in place when the desired opening has been reached, and also to bring the slats to the upper position when the key is no longer used. '

The following description will clarify the essence of the invention clarified; the drawings represent two embodiments of the subject matter of the invention that are only to be evaluated as exemplary embodiments dar; they show;

FIG. 1 shows a view of the open stand with the entire mechanism;
in Fig. 2 on a larger scale and in section, a modified embodiment of the key head;

in fig. ' 3, in section from the side, the modified embodiment of the key, sectioned along the line III-III In Fig. 2,

The key is, as shown in FIGS. 1 to 3, essentially consists of two umschließeriden parts 1 and 1 ', the pressed onto each other along a housing forming, having one side on / Schlüsselköpf a stack of slats 2, the 3 "by jaws 3 _t are, while also in the Mlt% e the stack of lamellas 2 an expandable block 4 is provided, which from

-A-

two rods 5, 3 ' , which can be pressed from one another by springs 6, 6 ^{1 -.verden;} the springs are in recesses 7,

In the main housing part there is a cam 8 which is moved by a lever 9 and can be pivoted about an axis 10; the cam 8 moves a lug 11, the tabs 12 of which engage in cutouts 13 in the arms 14, 14 ', which run out into the clamping jaws 3, 3 ¹ , while a spring 15 presses the lug 11 constantly against the cam 8 by being is supported against a stop 16. On the other hand, the cam 8 also actuates a crank arm 17 'whose head 18 engages in a cutout 19, a slide 20 which is constantly held in its lower position by a return spring 21 located in a narrow recess 22 of the slide.

The connection between the crank arm 17 and the slide 20 is maintained by a cam 23 of the crank arm; the Nocjen 23 engages in a recess 24 of the slide. The carriage in turn is guided during its displacements by means of an elongated recess 25, which on the one hand engages over the axis 10 and on the other hand around the stop 16.

The lower end of the slats 2 is fork-shaped (26); each fork part 27, 27 'ends in a prong 28, 28', which in a groove cut into the enclosing parts 1, 1 'engages.

The rods 5 »5 ^{1 of} the expandable block 4 are bevelled at their upper end so that they form a V-shaped slot 30. As shown in FIG.

109848/0021

In the embodiment according to fig, 1, the slats 2 of a axle 31 held by the expandable block 4 is carried.

When using the wrench, the V-shaped slot 30 is guided against the nut so that it is held properly and is centered. A push against the mother makes the stretchable one Block 4 guided downwards, taking axis 31 with it, and the mother pushes a small number of slats 2 at the same time down as they are required to find a fitting seat to achieve for the mother. This is possible because the fork parts 27. 27V of the fork 26 are flexible on each lamella and because in this way the prongs 28,28 'along the inclined Surfaces of the grooves 29, 29 'slide and can emerge from the grooves from there. When the stretchable block 4 is the "end of its Has reached downward movement, the axis 31 is approximately in the Height of the grooves 29, 29 'and blocked the prongs 28, 28' in the called grooves, so that the slats that have not been shifted before can no longer jump out. The key can only be used *. "- .. ■" ■ -

To return the key to the removal position when not in use, the lever 9 is pivoted about the axis 10. During this movement, the cam 8 is lowered and thus also the Knagge 11, the one with the. Cam is held in contact by spring 15; during "their movement, the catch 11 takes the arms 14, 14 'and thereby also the clamping jaws 3, 3', which are thus of> de »

109848/0021

inclined walls 32, 32 'of the enclosing parts 1, t' which the Cause the clamping effect of the clamping jaws in their upper position, are lifted off. '

Should the effect of the spring 15 not be sufficient to remove the clasp 11 to occupy downwards, one provided on the cam 8 occurs Nose 33 in action which rests against a stop 34 at the end of the arm 14 '.

When the clamping effect of the stack of slats 2 is canceled at the same time the crank arm 17 is moved by the cam 8; the crank arm 17 lifts the carriage 20 afc by means of cams 23. Therefore an upper section 35 of the slide 20 now comes into contact with the bottom of the stretchable block 4 and lift it up. This During its upward movement with the aid of the axis 31, the block takes the slats 2, which were previously guided downwards, upwards with it «

This movement continues until all of the slat 2 jind the stretchable one Block 4 are brought back to the upper position. At this moment the cam 23 slides along the recess 24, and the crank arm 14 comes off so that the return spring 21 can return the carriage 20 to its lower position.

When all the slats. 2 are back in their upper position, moved the lever 9 again so that it rests against the key, with the result that the aid of the cam 8 pushes the catch 11 and with it the arms 14, 14 * and the clamping jaws 3, 3 '

109848/0021

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which slide along the inclined walls 32 »32 'are lifted, "until it has a sufficient clamping effect on the stack of lamellas will.

In the embodiment according to the Pig. 2 and 3 has the stretchable one Block 4 besides the axis 3t still has a locking axis 36 »whereby the stretchable block 4 in its upper position slightly over the top the slats 2 protrudes.

Now when trying to find a mother outside of the stretchable To introduce blocks 4, the fork length 26 of the lamellas 2 can replace the prongs 28, 28 because of the axis 36 located there no longer narrow and the lamellas are therefore blocked.

If, on the other hand, the nut is inserted into the V-shaped slot 30 when the impact occurs, the expandable block 4 moves down to the level of the lamellas 2, and this path is sufficient, to allow the axis 36 to emerge from the fork 26 and thereby enable the slats 2 to lower themselves for as long as until the block 4 has reached the end of its downward movement. In at this moment the axis 31 comes at the level of the grooves 29, 29 ' on, un the prongs 28, 28 'of the lamellas that have not migrated downwards can no longer jump out of the grooves.

The structure of the device inevitably leads to an exact centering of the key over the nut, and you have with it

109848/0021

the security that on the nut in addition to a torque no other stress is exerted.

The creation has been described in a non-limiting embodiment; of course, numerous modifications of this embodiment are possible _r who think they are all within the scope of the invention.

Patent claims:

1098V8 / G071

BATH

Claims (3)

1S03930 Pat ent an s ρ r ü c h e; / 1.) wrench with variable opening t, characterized in that the wrench head has a number of lamellae normally clamped between two jaws, the central part of the head being designed as an expandable block consisting of two rods which can be expanded by springs, the upper parts of which are beveled in such a way are that the block is a V-shaped slot for guiding a nut in the key, and that the expandable block also has at least one bevel with which the slats are held in place when the desired opening is reached and with the the slats can be returned to their upper position after the key has been used. 2. Wrench with adjustable mouth width, characterized by a housing in which a cam is arranged which can be driven from the outside by a lever and which on the one hand moves an engaging device which has tabs which engage in cutouts that engage in the arms of clamping jaws in order to be lifted and lowering these clamping jaws to cause the "clamping together and loosening of a lamellar stack which is arranged in the head of the key, while the cam on the other hand, via a crank arm and a carriage, causes the re-lifting to exercise a clamping of the lamellas that have fallen down, first through the clamping jaws and then through a stretchy block wedged together _r the midst of 109848/0071 - ίο - Lamella stack is arranged, wherein the expandable block at least has an axis for clamping the slats remaining in the upper position as soon as the expandable block is in the lowered position Position has arrived and the desired mouth opening is reached, and to return the lowered slats to its upper position after the key has been used, and also wherein the top of the expandable block is cut into a V-shape is to serve as a guide for a nut to be inserted into the key. 3. Wrench with adjustable mouth width according to the claims 1 and 2, characterized in that the expandable block has two axes, namely one of the lamellas at upwards axis clamping the guided block together and an axis clamping the slats together when the block is guided downwards, the block exceeding the lamellas in its upper position by such an amount that when the upper side is moved downwards of the block to the level of the slats releases the axis for clamping in the upper position, so that the slats can be moved freely downwards, whereby it is achieved that the nut cannot penetrate the key at any point other than the central area of the key, i.e. at the V-shaped guide slot of the expandable block. 109848/0071