DE3316954A1 - Collapsible spider wrench with two mutually rotatable arms - Google Patents

Abstract

A collapsible spider wrench is proposed which has two arms (1, 2) of hexagon bars which are mounted in a longitudinally displaceable but rotationally locked manner in mutually rotatable, coaxial tubular pieces (8, 9) connected to one another at the end faces, the tubular pieces (8, 9) each having an annular flange at the end faces facing one another, via which annular flange they are connected to one another by means of a connecting piece in the form of a ring (12) C-shaped in cross-section or two discs firmly connected to one another and stepped at the periphery. <IMAGE>

Description

3 316 9 5 A

description

Foldable cross key with two against each other twistable arms

The invention relates to a collapsible cross key with two mutually rotatable arms, at the ends of which nuts are provided and which with the help of two against each other rotatable coupling parts are connected to one another.

The commonly used cross keys are both arms firmly welded together in their middle areas, and the mostly different sized nuts on hers Ends are molded in one piece with the arms. The disadvantage here is that, due to the cross shape, the screwing on or off required torque not immediately, only is transmitted over one half of one arm. In addition, the cross shape means that the overall length is relatively large of the arms so that the lever arm (force arm) required for adequate force transmission is achieved. the end For this reason and because of the cross shape, the known cross keys are also relatively bulky, and they lead in particular for larger versions, for example when the cross key is used as a Accessories for a bus or a truck are intended to cause problems in the accommodation.

In order to at least partially overcome these disadvantages, FR-PS 2 094 847 has a collapsible cross key proposed in which the two arms are flat and disc-shaped in their central area, so that with the Poor one-piece coupling parts are obtained, each one have a bore extending transversely to the longitudinal direction of the arm.

A bolt extends through the two bores and fixes the axis about which the two arms can be rotated relative to one another are, and which also serves to clamp the arms against each other. A very similar collapsible cross key with coupling parts on the arms in the form of in the middle Fixed lateral projections provided in the area thereof is disclosed in U.S. Patent No. 3,742,790. Somewhat simpler collapsible Cross keys, which also have a Axle bolts extending through aligned holes in the central area of the two arms are also in the DE-AS 1 703 551 and DE-OS 1 603 876 disclosed. Around a slightly stronger torque than if they were simply clamped against each other possible to be able to transfer are also here additional Facilities provided, namely a disc welded to one arm with a transverse trough-shaped Recess in which the other arm is received in the operating position (DE-AS 1 703 55.1), or two facing each other Indentations in the middle areas of the arms, for the mutual reception of the arms in the operating position (DE-OS 1 603 876). However, these additional devices, like the disk-shaped coupling parts and the lateral protrusions of the two previously described Cross key only insufficiently for stabilization of the cross-wrench in the unfolded operating position contribute, while on the other hand they are cumbersome to manufacture or attach and the cross keys are excessive more expensive. Furthermore, the arms of this well-known cross key, in order to be able to transmit a certain torque, the same length as with the cross wrench described above, with the arms firmly connected to each other.

On the other hand, DE-OS 1 948 702 has already disclosed a collapsible cross key which widened two in the middle Has arms, wherein the flat central part of one arm in a cross-sectionally T-shaped transverse groove in the middle

flattened part of the other arm can be added. For this purpose, the flat middle part is pushed into the transverse groove, the oval cross-section of the arms for a ensures that the arm is correctly aligned when it is pushed in. This means that the two arms can be used to put down the cross slide, for example be taken apart, another adjustment option is not given, however. In addition, the T-shaped transverse groove in particular means a considerable amount of effort in the manufacture! lung.

Finally, in DE-OS 2 131 372 there is a cross key disclosed in which a solid cross of guide arms is provided which are hollow and in which shafts attached to their outer ends are provided with sockets, telescopic extendable and retractable are included. A lock in the respective pull-out position can be achieved by a spring-loaded Ball can be achieved, which snaps into one of several recesses on the shaft. This well-known cross key also shows despite its relatively complex construction, the rest because of the fixed cross is bulky, only limited adjustability.

The invention is therefore based on the object of creating a cross-wrench of the type mentioned at the outset, which allows a simple, inexpensive manufacture the most effective torque transmission possible with the smallest possible dimensions and can be accommodated in a space-saving manner.

With the cross key, this task becomes the one specified at the beginning Art according to the invention solved in that as coupling parts two end-to-end, coaxially arranged, are provided on the mutually facing end faces rotatably connected pipe pieces, in each of the Pipe sections of one of the arms mounted displaceably in the direction of its longitudinal axis and transversely to the axis of rotation of the pipe sections, each

COPY

but is rotatably coupled to the pipe section.

As a result of this training, the two arms can be moved and rotated relative to one another as required, so that on the one hand practically the full length of an arm as a lever arm when opening or closing screws or nuts can be used - whereby the arm length can be selected to be shorter for a certain torque - and on the other hand the cross key in a different shape to save space can be worked out in which the two - comparatively short - arms are parallel to each other, and in which the space requirement is minimal. The infinitely variable, universal one thus given Adjustability also increases to this extent, among other things the applicability of the cross key, as it is also possible is that the two arms form an angle other than 90 ° with each other in use. The non-rotatable coupling between the arms and the respective pipe sections can be achieved in a simple manner in that the arms are made of hexagonal bars exist, which are received in hexagonal cross-section openings in the pipe sections. Such hexagonal bars also have the advantage of high flexural and torsional strength. The rotary connection with the separate pipe sections that can be rotated relative to one another can also be extremely stable and be designed firmly so that, if necessary, extremely large torques can be transmitted .. Here Such complex devices such as threaded bores, screws, wing nuts, etc. are also not required. In particular, it is also advantageous that the pipe sections can be designed identically, so that only one for their production Tool is required. The pipe sections can in particular be simply drawn metal parts, with a machine Post-processing, such as turning, in particular, is not required is. This enables an inexpensive production of the coupling parts and thus of the entire collapsible cross-wrench enables.

With regard to a particularly stable rotary connection, it is also advantageous if the two pipe sections are attached to the facing end faces have an annular flange and these annular flanges by means of a connecting piece engaging around them are connected to each other. The two ring flanges can, if this is preferred for manufacturing reasons will, protrude radially outward from the pipe sections, but preferably the annular flanges protrude inward. In this way, the exterior of the coupling parts becomes compact achieved without protruding sections, which facilitates manipulation with the cross wrench.

The connecting piece can in particular by a cross-section Be formed C-shaped ring. This ring is expediently made from a ring blank with an L-shaped cross-section kaitverformt by pressing, this ring blank with the short leg resting against the annular flange of one pipe section held and the end section of the long L-leg is bent with the help of a punch around the annular flange of the other pipe section.

On the other hand, in order to achieve a particularly solid, stable rotary connection, it is also advantageous if the connecting piece by two firmly together, e.g. by welding or * * * * ' Bolt, connected, stepped discs on their circumference are formed, which rest with their steps on the annular flanges

The invention is explained in more detail below with reference to the exemplary embodiments shown in the drawing. In detail:

Fig. 1 is a plan view of a cross key according to the invention, with dashed lines different positions of one cross-wrench arm held relative to the other imaginary arm are illustrated;

: S: · ::.: Ο ο toc? around·

Fig. 2 is a view of this cross-wrench, partially in section, along the line H-II in Fig. 1;

3 shows a side view of the cross key according to FIG 1 and 2, the two arms having been rotated into a mutually parallel position;

4 shows an axial section through the pipe sections connecting the two arms of the cross-wrench to one another, according to FIG the line IV-IV in Fig. 5, with the tool used to connect these pipe sections with the aid of a ring is illustrated in dashed lines;

FIG. 5 shows a plan view of the two pipe sections shown in FIG. 4;

6 shows an axial section through the ring blank used to connect the pipe sections before it is deformed, according to the line VI-VI in Fig. 7;

7 shows the ring blank according to FIG. 6 in a top view; and

8 and 9 each have a partial axial section similar to each other 4 shows two other types of connection for the pipe sections coupling the arms to one another.

The cross key shown in Figs. 1 to 5 has 1 to 3, two arms 1, 2 each formed by a hexagonal rod, at the ends of which nuts 3, 4, 5 and 6 are provided. The nuts 3, 4, 5 and 6 can be rigid, i.e. fixed, connected to the arms 1 or 2, they are but advantageously detachably attached or attached, as illustrated in Figures 1 and 3 at 3 'and 6 ", respectively. In addition, it is also possible to equip the nuts with ratchets so that they can be taken along in one or the other, as desired To accomplish the direction of rotation. The two arms 1, 2 are

so movably coupled to one another that they are on the one hand about an axis 7 extending perpendicular to them (Fig. 2) against each other twisted and, moreover, can be shifted in their longitudinal direction. For this purpose there are two coupling parts 8, 9 in the form of short coaxial, identically formed Pipe pieces provided. These pipe sections 8, 9 are at the front to one another, as can best be seen from FIG. 4, the two pipe sections 8, 9 each protruding inwardly Have annular flange 10 and 11, respectively. These ring flanges 10, 11 rest against one another and are used to implement the rotary connection of the two pipe sections 8, 9, including an inner ring 12 that overlaps the two ring flanges 10, 11 is provided as a connector. To a mutual twisting of the two pipe sections 8, 9 not being too difficult to make, the pipe sections 8, 9 have for the purpose of lubrication on their facing end faces radial, semi-cylindrical see lubricant grooves 13, 14, each on the inside of the Ring flanges 10, 11, in the contact area of the ring 12, end and together form a lubricant opening 15, which for Supply and distribution of lubricants in the field of adjacent ring flanges 10, 11 of the pipe sections 8, 9 and the ring 12 is used.

As can be seen in particular from FIG. 4, in cross section C-shaped ring 12 at with their ring flanges 10, 11 pieces of pipe held against one another on the end face 8, 9 by cold forming from a ring blank 12 '(cf. also Fig. 5 and 6) produced. A tool illustrated in broken lines in FIG. 4 is used for this purpose, that of an annular, stationary when deformed Counterholder 16 on which the lower pipe section 9 is pushed and on the end face of the ring blank 12 'with his preformed lower annular flange rests, and consists of an up and down movable punch 17. The stamp 17 has

at its lower end one according to the desired one Shape of the ring 12 after the bending of the upper section formed paragraph with a fillet 18. This pressing tool, i.e. the punch 17, is on an eccentric press, not shown, or the like. attached and leads a predetermined working stroke, so that the upper portion of the long leg of the L of the ring blank 12 'over the Annular flange 10 of the upper Rohrstlickes 8 is bent in the desired manner without this section against too strong the annular flanges 10, 11 is pressed, which could make a mutual rotation of the pipe sections 8, 9 impossible. With In other words, the working stroke of the punch 17 is set so that that after bending over the upper portion of the ring blank 12 'this the ring flange 10 of the upper pipe section 8 overlaps with a certain amount of play, so that the pipe sections 8, 9 can be rotated against one another.

In each case one of the arms 1, 2 passes through one of these pipe sections in a direction perpendicular to the axis 7 of the pipe sections 8, 9, namely the arm 1 the upper pipe section 8 in FIG. 4 and the arm 2 the lower pipe section 9 hexagonal openings 19, 19 'and 20, 20' opposite one another are provided in the walls of the pipe sections 8, 9. As a result, the arms 1 and 2 formed by the hexagonal rods are non-rotatably connected to the pipe sections 8 and 9, respectively, but can be displaced relative to these in the direction of their longitudinal extension, ie perpendicular to the axis of rotation 7.

The openings 19, 19 'and 20, 20' are in this way in the Pipe sections 8 and 9 provided that they on the one hand as possible are arranged close together, but on the other hand enough material between them and the face of the respective Pipe section 8 or 9 remains, so that a breakage of the pipe sections is prevented. One side expediently runs the hexagonal openings parallel to the face of the pipe sections, as can be seen, for example, from FIG.

ORIGINAL COPY

As a result of the 1 ä'ngsverschiebl ichen storage of each arm 1 or 2 in the associated pipe section 8 or 9 and as a result of the rotatability of the pipe sections and thus the arms 1, 2 about the axis 7, these arms 1, 2 can be in various positions relative are brought to one another, as illustrated, for example, in FIGS. 1 and 2 and also in FIG. 3. In particular, it is possible to place a nut, for example nut 4, on a screw head and push the other arm, in this case arm 1, very close to this nut 4 in the direction of the longitudinal extension of arm 2, and also to achieve this a lever arm as long as possible to push this arm 1 as far as possible out of the associated pipe section 8 until practically the opposite nut 5 rests on the pipe section 8, as shown in FIGS. 1 and 2 with full lines. In the case of an obstacle, the arm 1 can then be pivoted somewhat about the axis 7 (which is perpendicular to the plane of the drawing according to the representation in FIG. 1), as is illustrated schematically in FIG. 1 at 1 ″ at 1 ¹ or 2 'a further possibility for the adjustment of the arms is shown with dashed lines. Finally, at 21 and 22 in FIG . 1) To tighten or unscrew the screw nut or screw that has been picked up.

In Fig. 3, the cross key described is in a "together shown in the folded "position, in which it takes up little space. The fact that the arms save space also helps of the present cross-wrench due to the fact that they are longitudinally displaceable in the respective coupling part 8 or 9 are stored, can also be shorter, but an adequate lever arm is achieved, see. Fig. 1, 2.

FIG. 8 shows an embodiment that is modified compared to FIG. 4 with regard to the implementation of the rotary connection of the pipe sections 8, 9 illustrated. The two show in detail

BAD ORIGINAL _C OPY

Pipe sections 8, 9 each have an outwardly protruding annular flange 10a or 11a, and these annular flanges 10a, 11a are of an externally attached and encompassing ring 12a held together, so that the two pipe sections 8, 9 are rotatably connected to one another. Similar to the embodiment According to FIG. 4, a ring blank (not shown) is assumed which has an L-shaped cross-section, but now the horizontal leg of the L faces inwards, in contrast to the ring blank according to FIGS. 6 and

7. The top section of this ring blank will turn

with the help of a forming tool with pipe pieces placed one on top of the other

8, 9 bent around the annular flange 10a of the upper pipe section 8, including a tool with a lower pipe section 9 encompassing Counterholder 16a and a hollow punch 17a are used, as illustrated schematically in FIG. 8 with dashed lines is.

Yet another form of rotary connection of the two pipe sections 8, 9 is shown in FIG. 9. The pipe sections 8, 9 are again, like those according to FIG. 4, provided with inwardly projecting annular flanges 10, 11, and over these annular flanges 10, 11, the pipe pieces 8, 9 are held together with the help of a connecting piece that allows mutual rotation the pipe sections 8, 9 allowed. In this case, the connecting piece is connected to one another by two instead of one ring Disks 23, 24 are formed which are stepped on their circumference in accordance with the annular flanges 10, 11. The two Discs 23, 24 after they have been brought into position within the pipe sections 8, 9 as shown, for example by screwing, by electric spot welding or the like., as indicated at 25, firmly connected to one another, so that the pipe sections 8, 9 are securely connected via their annular flanges 10, 11 and hold together so that they can be twisted against each other.

In all described embodiments can be identical trained pipe sections 8, 9 are used, which on

..O'OO 331695A

can be produced in a simple manner, in particular by drawing or deep drawing. For making the slewing ring with the help of the connecting pieces, such as the ring 12 or 12a or the disks 23, 24 (which are also ring-shaped can be designed), simple forming or fastening steps are required, so that an extraordinary simple, quick and inexpensive manufacture of the collapsible Cross wrench is enabled.

The cross keys described are suitable, for example as an accessory for passenger cars and especially as a tool accessories for buses, trucks, agricultural vehicles Vehicles and mining machines. The cross keys fit practically in the folded position according to FIG. 3 in every tool box.

As further illustrated in Figures 1 and 3, in the case of removable nuts, e.g. Pushing into the pipe pieces are deformed by upsetting in their end regions that an annular collar or Bead 26 is formed, which prevents the arm from slipping out of the associated piece of pipe when the nut is removed became.

Claims (5)

Foldable cross key with two against each other ve!. rotatable arms Priority: May 11, 1982 - Austria - A 1837/82 Claims f 1. ") Foldable cross key with two against each other rotatable arms, at the ends of which nuts are provided and with the aid of two coupling parts which can be rotated against one another «N are connected to one another, characterized in that as coupling parts two abutting one another at the front, Coaxially arranged pipe sections (8, 9) are provided that are rotatably connected to one another on the facing end faces are, where in each of the pipe sections one of the arms (1, 2) in Direction of its longitudinal axis and transverse to the axis of rotation (7) of the tube pieces (8, 9) can be moved, but not with the earpiece is rotatably coupled. BAD ORIGINAC COPY ::: · ::.: JJ I by 2. Cross key according to claim 1, characterized in that that the two pipe sections (8, 9) have an annular flange (10, 11; 10a, 11a) on the end faces facing one another and these annular flanges are connected to one another by means of a connecting piece (12; 12a; 23, 24) which engages around them. 3. Cross key according to claim 2, characterized in that that the ring flanges (10, 11) protrude inwards. 4. Cross key according to claim 2 or 3, characterized in that that the connecting piece is formed by a ring (12; 12a) with a C-shaped cross section. 5. Cross key according to claim 3, characterized in that that the connector is fixed to one another by two, e.g. is formed by welding or screwing, connected, stepped discs (23, 24) on their periphery, which with their steps on the ring flanges (10, 11).