DE2260769A1 - CLAMPING DEVICE FOR FREE WINCHES - Google Patents

Description

PR. INQ. HANS LICHT! · DIPL.-INQ. HEINER LICHTI

KARLSRUHE-DURLACH QRÖTZINQER STRASSE 61

TELEPHONE | Q7 £ i) 411 24

December 11, 19 72 2501/72

Milbras company, Saint-Etienne (Loire), 13, rue Pierre Copel

France

Clamping device for free rope winches

The invention relates to an automatic clamping device for free-wheeling winches with two pairs of jaws, consisting of one movable inner clamping jaw and one U-shaped outer clamping jaw surrounding it, between which the rope or cable is guided

There are essentially two types of rope or cable wind known. With drum winches, the drum is set in rotation by a motor and in this way the rope or cable is wound onto the drum « In the case of free rope winches, on the other hand, two clamping devices are provided that alternately pull the cable to wind it up, whereby even when the rope passes through the winch, its end beyond the winch remains free to that, principle such a winch is described, for example, in FR-PS 687 232. Furthermore, FR-PS 1 451 230 is a

- 2—

309826/0336

improved clamping device for such a winch has been known (each pair of clamping jaws from a U-shaped outer jaw and an inner jaw surrounded by this is formed · The clamping of the rope between the two Baking is generated by cams, which yrimearly on the outer, U-shaped jaws act! to this against to press the inner jaw. This will clamp the cable between the two jaws when it takes the load should record

In all known execution farms meet the requirements outlined Cam two tasks:

a) You determine a sufficient clamping force between the two jaws to pull the cable and

b) after clamping the two jaws, they take over the entire tensile force of the cable through the clamping device or rope.

The coefficient of friction of one clamped by the jaws Cable is around 20%, while that of the cams for clamping the jaws on the cable to be pulled the pressure to be applied must be at least six times the tensile force of the cable. This imperative proportionality between clamping pressure of the jaws and the train = force with a value of 6: 1 is achieved in the known winches in a simple manner by the fact that two separate Lever pairs are used, between which n.u.r the wedge connection each pair is present and on the one hand on the ends of the cam profiles, on the other hand on di§ Swivel or pull axes of the mechanics act. This on the side the clamping jaws arranged levers are necessary-

wise relatively thin and transmit the enormous clamping forces with the interposition of bearings with a relatively small surface area - the two pairs of levers form a parallelogram, which tends to deform itself under the great forces, creating between the individual parts undesirable frictional forces occur in the cantilever winch. This leads to deformation of the components and to a rapid wear and tear. The known embodiments are therefore can only be used for winches with a relatively low pulling force. On the other hand, you can also use the known Constructions do not rely on winches with great force, which are, for example, able to withstand tensile forces of more than 5 to. on

i to exercise the cable transmit

The invention is based on the object of eliminating these disadvantages and a system for an automatic exciting To propose clamping device, which can be used in a price winch with large pulling force.

To solve this problem, the invention is based on the clamping device described above, which is according to the invention characterized in that each pair of jaws overlapped at its two longitudinal ends by a bracket whose cross web is on the inside "" side with a rocker resting against the outer back of the inner clamping jaw provided and the one also across this back lying axis is pivotable, and that the reaching beyond the outer jaws free end of the arms of a Bracket on the one hand via a spring with an abutment on the outer clamping jaw, on the other hand via at least a handlebar are connected to the free end of the arms of the other bracket, the spring the bracket in one of the Jaws swiveling exciting direction.

-4-309H26 / 0336

As with the known cantilever winches, at least one of the brackets has a drive for pivoting about its axis tied together. The driven bracket can have a welded tab with a hole on its crosspiece have to accommodate the bearing journal of a rod or an actuating lever

According to a further embodiment of the invention, each rocker acts on the back of the inner clamping jaw in FIG in two ways, namely in a direction approaching the two jaws and in a direction away from each other.

This effect can be achieved, for example, that the rocker with the back of the inner clamping jaw via a cylinder body (41, 141) arranged on it and lying outside its pivot axis stands in a shell surrounding it at an arc angle of more than 180 ° on the back of the inner clamping jaw stored 1st.

In the preferred embodiment, each rocker is on the outer back of the inner jaw after installation A bearing block can be fastened in a partially cylindrical bearing shell having a central angle of 180 or less, which has a bearing surface that complements the partially cylindrical bearing shell and defines the cylinder body.

According to a further exemplary embodiment of the invention, the inner clamping jaw has close to each of the two partially cylindrical ones Bearing shells have a dovetail-shaped transverse groove into which the dovetail of a bearing block intervenes.

309826/0336

226076S

The two bearing jewels can each by means of a penetrating, in a threaded hole of the inner clamping jaw engaging screw attached to this. Through this it is achieved that the most essential functional forces taken up by the dovetail joint and not by the screw that goes with its. Head up supports the jewels.

According to a further feature of the invention, each rocker has a stool at its upper apex, which is in a Recess engages in the crosspiece of the bracket and into this is shrink-wrapped.

Each rocker can have a nose that with which the pivoting movement of the corresponding bracket when releasing the clamping jaws limiting stop surface cooperates on the inner clamping jaw. ■

Further features, details and advantages of the invention emerge from the following description of an in the preferred embodiment shown in the drawing. Show by:

FIG. 1 shows a cantilever winch in a perspective view; FIG. 2 shows a longitudinal section through the winch according to FIG. 1;

FIG. 3 shows an exploded view of the parts forming a pair of clamping jaws of a cantilever winch;

FIG. 4 shows a side view of an inner clamping jaw equipped with the rockers before they are attached on the transverse web of the bracket;

-6-

309326/0336

Figure 5 is a partially broken away side view of a Pair of clamping jaws in the working or rest position with self-clamping and

FIG. Β, a view similar to FIG. 5 of the jaws in FIG the relaxed location.

In Figures 1 and 2, a cantilever winch is shown, which is enclosed by a housing. On the housing, a winding lever 2 is attached, which in the direction of Arrows 3 and 4 can be moved back and forth. The winch also has a downdraft lever 5, a handle 6 and a fastening hook 7 on.

A winch of this construction is known to be in the way operated that the hook 7 is attached to a fixed point and then the lever 2 in the direction of arrows 3 and is pivoted. In this way, the rope or cable 9 can be dragged or pulled against a load, not shown will. The rope 9 crosses the winch over the entire length of the housing 1. That remains in front of the housing End 10 of the rope 9 free.

The movement of the rope 9 is carried out with the help of two pairs of jaws 11 and 12, which are located inside the housing 1 are arranged, allows. These jaws are through a linkage, which is known and not shown, connected to the end 13 of the lever 2, which in turn is pivotable about an axis 14. Be that way the pairs of jaws 11 and 12 alternately in one approaching them (arrows 15 and 16) or one away from one another Movement. During this movement is one of the

- 7-

309826/0338

Jaw pairs, ζ * B. the pair 12, clamped on the cable 9, while the other pair of jaws 11 is open. This functional principle of a cantilever winch is in itself known.

The invention consists in a particularly advantageous one Formation of the pairs of jaws 11 and 12. These pairs of jaws are the same among themselves, so that only one pair of jaws, for. B. the pair 11, is to be described ■

Each pair of jaws has an inner clamping jaw 17 and an outer clamping jaw 18. The clamping jaw 18 has a U-shaped cross-section and surrounds the clamping jaws 17, it extends upwardly ER- ¹ on both sides thereof. In the upper area, the clamping jaw 18 has two pairs of bearings 19 and 20 for receiving pivot axes 21 and 22 on its side webs (FIGS. 5 and 6). The two Klommbacken 17 and.18 are overlapped at their ends by two brackets 23 and 24, which are formed the same under the, so can be made by means of a single tool. The two arms of the front bracket 23, which extend on both sides of the outer clamping jaw and extend beyond this, have aligned bores 25 below the same for receiving a transverse axis 26. Below the bores 25, the bracket is provided with shoulders 27, against which a plate 28 with a centrally attached finger 29 rests. This finger serves to receive the end turn 30 of a compression spring 31 which is centered on the finger 29. The end turn 30 has a hook 32 which, after assembly, lies around the axis 26 (see FIGS. 5 and 6). At its other end, the spring 31 has an end turn 33 which attaches itself to

-8th-

309826/0336

a pin 34 centered, which in turn on an abutment 35 connected to the clamping jaw 18 for the spring sits. Near its top, the bracket 23 has two aligned holes 36 into which the transverse axis 21 (Figs. 5 and 6) intervenes. This lies above the outer back of the inner clamping jaw 17.

The bracket 23 has a recess in its transverse web 37, which can be square or rectangular. It serves to accommodate a hump 39 having the same profile on the apex of a rocker 40 · This rocker formed from a solid piece has a cylinder body 41 carried by an arm 42, the Cylinder angle is at least 260 °. The rocker 40 also has a nose 43. Between the arm 42 and the The nose 43 of the rocker 40 is provided with a partially cylindrical recess 44, the diameter of which is the pivot axis is adapted. This recess can be open to the outside, as shown in the area indicated by arrow 45.

During production, the stool 39 is placed in the recess of the transverse web 37 of the bracket 23 fitted and welded (see Fig. 6). This creates a particularly strong connection that is capable of significant, in the To transmit the height of the rocker 40 acting forces when the bracket 23 pivots about its axis 21.

On the outer back of the inner clamping jaw 17 is a bearing shell 46 forming cutout with approximately semi-cylindrical profile is provided which supports the cylinder body 41 of the rocker 40. In addition to the bearing shell 46 is an undercut transverse groove 47 is arranged, the one

—9—

309826/0336

2260763

dovetail pin 48 of a bearing block 49 takes up · The attachment of the bearing block is carried out by a screw 50, which this bearing block over its entire Penetrates height and engages in a threaded hole 51 in the base of the transverse groove 47 (see Figures 3 and 4).

The bearing block 45 has a concave bearing surface 52, which the cylindrical surface of the bearing shell 46 in the inner Clamping jaws 17 added (see Figures 5 and 6) · After assembly, the bearing shell 46 and the concave bearing surface form 52 a section of a cylindrical surface with a central angle in the order of magnitude of 260 ° »this concave The cylinder section forms a bearing for the cylinder body 41 of the rocker 40 arranged therein. As the bearing shell 46 and the concave bearing surface 52 of the bearing block 49 the cylinder body 41 with an arc angle of more surrounded as 180, the cylinder body is taken and can cannot come out of the clamping jaw 17

The clamping jaw 17 has in its upper region an inclined stop surface 53, which with the nose 43 of the Rocker 40 cooperates to limit the pivoting movements of the bracket 23 when it is in the position according to Figure 6 is in which the jaws are released.

The bracket 24 is formed in the same way as the bracket 23 with the difference that it is up through a welded tab 54 is extended with a hole 55. This is used to attach the aforementioned Linkage that connects to the end 13 of the operating lever 2 manufactures. Like the bracket 23, the bracket 24 has two aligned bores 125 for receiving it a transverse axis 126. Its web 137 is provided with a recess 138 into which a rocker 140 is welded

30 9 8 26 / 0-33 & ■

-10-

is. Furthermore, the bracket 24 has two aligned extinguishers for receiving the axle 22, which in the same way crosses a recess 144 in the rocker 140 * The rocker 140 has a cylinder body 141 which lies in a second bearing shell 146 of the inner jaw 17. The one from this one Bearing shell 146 formed guide surface is supplemented by a concave bearing surface 152 on the bearing block 149, which engages with its dovetail pin 148 in a transverse groove of the inner jaw 17. This shows next to the Bearing axis 146 has an inclined stop surface 153.

The transverse axes 26 and 126 at the free ends of the brackets 14 and 24 are connected via two lateral links 56. The axles 21 and 22 have rollers at their ends, which are in a guide 57 (Figure 1) in the lateral splash of the housing 1 are performed. The cable or rope 9 is between the bottom of the outer U-shaped jaw 18 and the base of the inner jaw 17 is inserted. The way it works is as follows:

When the lever 2 is actuated, the operator transmits a to the axis 155 in the bore 55 of the bracket 24 Force in the direction of arrow 58 (FIG. 5), so that the bracket 24 pivots about its axis 22. The connection through the link 56 causes the bracket 23 to pivot in the same direction about its axis 21. As a result of this movement the cylinder bodies 41, 141 lie down with pressure on the back of the upper clamping jaw 17 (directional arrow 59 in FIG. 5) on, whereby the cable or rope 9 is pressed into the bottom of the U-shaped clamping jaw 18. Clamping the Cable is done by directly supporting the two clamping jaws 17 and 18 on one another, if one assumes

-11-

309 826/0136

that each axle 21 or 22 is located directly in the bearings 19 and 20 of the clamping jaw 18 and thus serves as the axis of rotation for the rocker 40 or 140 · None of the intermediate Parts intervene in the power flow that develops between the clamping jaws 17 and 18 after translation. This results in a great rigidity and strength for the device, which allows it to Cable 9 to transmit significantly greater tensile forces than in the known embodiments.

If a force in the direction of the arrow 60 (FIG. 6) is transmitted to the axle 155 by actuating the lever 2, then . The bracket 24 pivots about its axis 22 in the same Direction (see Figure 6). The links 56 take with them the bracket 23 which is pivotable about its axis 21. At the same time, the The cylinder body 41 or 141 of the rockers 40 and 140 is raised in the direction indicated by the arrow 61. By the connection of the cylinder body 41 or 141 with the inner clamping jaw 17 also lifts this in the direction of the arrow 61, whereby it maintains its parallel position to the clamping jaw 18. The cable or rope 9 comes on this Way free so that the pair of jaws il in the longitudinal direction _ can be adjusted while the other pair of jaws 12 remains clamped.

The spring 31 ensures that the bracket 23 and 24 always in the direction of arrow 58 (Fig. 5), i.e. H. in the sense of the clamping movement of the jaws 17 and 18, are pivoted when the winch is in a rest position or even in an intermediate phase when the direction is reversed. The feathers 31 also have a certain security function in order to

ver—

to improve safety when operating the winch.

- 12 -

309 8 26/0336

The main advantages of the device according to the invention are as follows:

1.) The manufacture of the rockers 40, 140, the bracket 23, 24 and the jaws 17 and 18 are limited to simple operations of drilling and punching, in particular, no complicated profiles have to be manufactured.

2.) The winch has a stable structure, so that on the rope or cable 9 considerable clamping forces are applied and thus the drag force of the winch can be increased

3.) are interposed Since during the transmission of the total force between the jaws 17 and 18 are no parts that jaw pairs can be formed considerably more space-saving, and in particular it is possible, the length of the jaws 17 and 18, ie, the effective contact area tit the cable 9 to enlarge. As a result, the clamping force of the cable can in turn be increased while at the same time locally reducing the specific pressures exerted by the clamping jaws 17 and 18 on the surface of the cable or rope. Despite the increase in the effective pulling force, this reduces the wear and tear on the cable or rope compared to conventional winches.

4.) The installation of the springs 31 for self-clamping of the jaws 17, 18 is extremely simple, since an attachment or connection to the winch housing is no longer necessary is.

-13- 309826/0336

5.) The swivel axes. 21 and 22 do not take over any torsional forces. The relatively high ones that must always be recorded Tensions act uniformly as shear forces, which are created in four planes by the structure according to the invention (corresponding to the four supported ends of the axles 21 and 22). This division of the Thrust forces improve the functional conditions for the pivot axes 21 and 22 and allow an increase the pulling force of the winch.

Lj / bl

309826/0336

Claims (11)

Claims 1. Clamping device for free rope winches with two pairs of jaws, consisting of a movable inner clamping jaw and a »U-shaped one surrounding it outer clamping jaws between which the rope or cable is guided, characterized in that each pair of jaws (11, 12) is overlapped at each of its two longitudinal ends by a bracket (23, 24), the transverse of which * web (37, 137) on the inside with an outer back of the inner clamping jaw (17) abutting rocker (40, 140) and the one also across this Back axis (21, 22) is pivotable, and that the free end of the arms of a bracket (23) extending beyond the outer clamping jaws (13) on the one hand a spring (31) with an abutment (34, 35) on the outer clamping jaw (18), on the other hand via at least a handlebar (56) with the free end of the arms of the other Bracket (24) is connected, the spring the bracket (23) pivots in a direction that clamps the clamping jaws (17, 1Θ) 2. Clamping device according to claim 1, characterized in that that at least one of the brackets (24) with a drive (2) is in connection (13, 54, 55, 155) for pivoting about its axis (22). 3. Clamping device according to claim 2, characterized in that that the driven bracket (24) on its transverse web (137) 309826/0336 -15- 2260763 a welded-on bracket (54) with a bore (55) for receiving the bearing pin (155) of a rod or having an operating lever. 4. Clamping device according to claim 1, characterized in that each rocker (40, 140) on the back of the inner Clamping jaws (17) in two ways, namely in one approaching the two clamping jaws (17, 18) and in one they act in a distant direction. 5. Clamping device according to claim 4, characterized in that the rocker (40, 140) with the back of the inner Clamping jaw (17) via a cylinder body (41, 141) arranged on it and outside its pivot axis is in connection, which is in a shell (46, 146) surrounding it with an arc angle of more than 180 the back of the inner jaw (17) is mounted. 6. Clamping device according to one of claims 1 to 5, characterized characterized in that on the back of the inner clamping jaw (17) after installation of each rocker (40, 140) into a partially cylindrical bearing shell (46, 146) having an arc angle of 180 ° or less The bearing block (49, 149) can be fastened, the cylinder body (41, 141) supplementing the bearing shell has a defining bearing surface (52, 152) 7. Clamping device according to claim 7, characterized in that the back of the inner clamping jaw (17) near each Bearing shell (46, 146) has a dovetail-shaped transverse groove (47) into which a bearing block (49, 149) arranged dovetail (48, 148) engages. -16- 309826/0336 8. Clamping device according to one of claims 1 to 7, characterized! that each bearing stone (49, 149) of a screw (50) is penetrated, which engages in a threaded bore (51) in the base of the transverse groove (46, 146) such that the essential functional forces through the dovetail connection and not through the screw supported by its head on the bearing block can be added. 9. Clamping device according to one of claims 1 to 8, characterized characterized in that each rocker (40, 140) has a stool (39) at its upper apex, which is in a Recess (38, 138) engages in the transverse web (37, 137) of the bracket (23, 24) and is welded into it. 10. Clamping device according to one of claims 1 to 9, characterized in that each rocker (40, 140) one Has nose (43) that with a pivoting movement of the corresponding bracket (23) when releasing the clamping jaws (17, 18) limiting stop surface (53, 153) on the inner jaw (17) cooperates. 11. Device according to one of claims 1 to 10, characterized in that one end (33) of the tension spring (31) is supported on a fixed abutment (34, 35) on the outer, U-shaped jaw, while the other end (30) one provided with a centering finger (29) for the spring, is attached to the shoulders (27) of the corresponding bracket (23) supporting plate (28) and with a hook (32) formed from its end turn on a transverse axis (26) is suspended, on which the connecting rods (56) engage the two brackets. Lj / bl 309826/0336 Lee t s er t e