EP0038330A1

EP0038330A1 - Tightening sleeve for straps

Info

Publication number: EP0038330A1
Application number: EP19800901406
Authority: EP
Inventors: Edith Rutzki
Original assignee: Individual
Current assignee: Individual
Priority date: 1979-07-11
Filing date: 1981-02-09
Publication date: 1981-10-28
Also published as: DE2928028A1; JPS56500882A; WO1981000291A1

Abstract

Le manchon de serrage pour sangles, en particulier pour porteurs de charges, comprend une fixation pour une extremite fixe de la sangle (28) et un dispositif pour le serrage de la sangle. La sangle (28) traverse, selon la direction de serrage (d), deux paires (5, 6; 20, 23) de machoires de serrage, dont la premiere paire (5, 6) est passive et exerce son action de serrage dans la direction opposee (C) a la direction de serrage (d) et dont la seconde paire (20, 23) est active et exerce son action de serrage dans la direction de serrage (d). Les machoires de serrage passives (5, 6) maintiennent la sangle (28) mais ne servent pas a son serrage tandis que les machoires de serrage actives (20, 23) sont utilisees pour le serrage proprement dit.The tightening sleeve for straps, in particular for load carriers, comprises a fixing for a fixed end of the strap (28) and a device for tightening the strap. The strap (28) crosses, in the tightening direction (d), two pairs (5, 6; 20, 23) of clamping jaws, the first pair (5, 6) of which is passive and exerts its clamping action in the opposite direction (C) to the clamping direction (d) and whose second pair (20, 23) is active and exerts its clamping action in the clamping direction (d). The passive clamping jaws (5, 6) hold the strap (28) but are not used for its tightening while the active clamping jaws (20, 23) are used for the actual tightening.

Description

you can only stretch limited lengths of the loose end of a webbing. Furthermore, they are complicated and heavy, so that they are not suitable for many applications.

The present invention has for its object to improve a turnbuckle of the type described in such a way that it can be used to span endless belt lengths. This object is achieved according to the invention by two successive pairs of clamping jaws in the clamping direction, through which the webbing runs, the first passive pair of clamping jaws exerting its clamping action in the opposite direction to the clamping direction and the second active pair of clamping jaws exerting its clamping action in the clamping direction and forming the tensioning ratchet. The term passive pair of jaws is intended to indicate that these jaws hold the tensioned webbing in place, but that they are not actively used for tensioning purposes. The term active pair of jaws is intended to mean that the actual clamping process is carried out with these jaws. The turnbuckle according to the invention enables infinite lengths of the webbing to be tensioned, is simple and easy to construct and is inexpensive to manufacture.

According to a particularly preferred embodiment, the jaws of the passive pair are provided on their mutually opposite surfaces with interlocking recesses and projections between which the clamped webbing is folded, so that it is held in such a way that even with large tensile forces due to the wrapping of the projections accidental opening does not occur. The depressions and projections on the mutually opposite surfaces of the clamping jaws are preferably designed in the form of a coarse toothing which runs transversely to them

Tension lock for straps

The invention relates to a turnbuckle for webbing, in particular for load securing systems with a fastening for the fixed end of a webbing and with a tensioning ratchet for tensioning the webbing. Such turnbuckles are used, among other things, for tensioning belt straps that are intended to secure heavy and heaviest loads and are used as wrap-around straps and as loading straps with snap hooks and D-rings.

The known turnbuckles have the disadvantage that with

is expediently straight, the individual tooth surfaces adjoining one another at obtuse angles and the tooth tips being rounded. It has proven to be advantageous if the one clamping jaw contains at least two projections or teeth and the opposing clamping jaw contains at least three projections or teeth.

According to a further particularly advantageous embodiment of the invention, the pivoting movements of the clamping jaws around their pivot pins are synchronized by mechanical coupling, this synchronization advantageously being carried out by toothed segments which are attached to the side of the clamping jaws and the axes of rotation of the toothed segments being aligned with the axes of rotation of the pivoting pins of the clamping jaws collapse. A deflector can prevent the webbing from accidentally entering between the toothed segments.

To release the clamping jaws of the passive pair, a locking lever is advantageously used, which pivots the one clamping jaw of the passive pair about an eccentric shaft. The securing lever expediently has a latching mechanism which locks it when the passive clamping jaws are closed. A spring-loaded locking pin can serve as the locking mechanism.

It is advantageous if the toothing of the toothed segments is chosen so coarsely that their teeth remain in engagement even when the clamping jaws are separated from one another. At least one of the jaws of the passive pair is expediently spring-biased against the clamping direction.

According to a further particularly advantageous embodiment of the invention, the active pair of clamping jaws forming the tensioning ratchet contains a clamping piece provided with a tensioning lever and a counter-holder which is fastened in a rocker is which is pivotable about the same axis of rotation as the clamping piece. The rocker is expediently under resilient bias so that it is pushed towards a stop. Preferably, a latching mechanism is connected to the rocker, which initially holds it when the tensioning lever is returned from its maximum deflection, so that when the tensioning lever is returned, the clamping connection of the clamping jaws of the active couple is opened and the belt strap is released by them. In a simple embodiment, the latching mechanism is formed by a ball latch which snaps into a bore in the housing, the tensioning ratchet containing a disengaging member which releases the latching mechanism again when the tensioning lever has reached a certain position during its return movement. The disengaging member practically consists of a stop on the tensioning lever that engages the rocker.

It when the two pairs of jaws are arranged so that the loose end of the webbing passes straight through it is particularly advantageous. The tensile force exerted by the active pair of clamping jaws is not reduced by any deflections and friction of the webbing.

The accompanying drawings of a preferred embodiment example serve to further explain the invention.

Fig. 1 shows a plan view of a turnbuckle in a partially sectioned illustration.

FIG. 2 shows a side view of the turnbuckle shown in FIG. 1 in longitudinal section along the line II-II of FIG. 1. Fig. 3 shows a cross section through the turnbuckle along the line III-III of Fig. 2nd

Fig. 4 shows a cross section through the turnbuckle along the line IV-IV of Fig. 2nd

FIG. 5 shows an oblique cross section through the turnbuckle along the line V-V of FIG. 2.

6 shows a schematic and enlarged illustration of a side view of a further embodiment of the passive clamping jaws used in the turnbuckle in the open state.

Fig. 7 shows a representation corresponding to that of Fig. 6, but in which the two clamping jaws are shown in the closed state, in which a webbing is clamped between them.

The turnbuckle contains a housing 1, which consists of two side plates arranged parallel to one another at a somewhat greater distance than the width of the belt webbing, which are connected to one another by a base plate which is uniformly connected to them. The housing is open at its top, likewise at its front, which points in the direction of the pulling direction indicated by arrow c and on its rear, which points in the direction of the tensioning direction indicated by arrow d. At the rear end of the housing 1, a bolt 2 is attached between the two side plates in the lower region thereof. The bolt is used to fasten the fixed end of a webbing. A locking lever 3 extends on the front upper end of the housing on both sides inside along the side plates. The locking lever 3 is fastened to an eccentric shaft 4 extending transversely through the housing, around which an upper clamping jaw 5 of the passive pair is rotatably mounted. Opposite the upper clamping jaw 5, a lower clamping jaw 6 is rotatably mounted about a shaft 7 which penetrates the housing in the region of its underside. The jaws 5 and 6 are provided with mutually facing engagement surfaces 5a and 6a. The locking lever 3 is held in the position designated by position A in FIG. 2 by a locking pin 8 which engages in an undercut groove 8a of the housing extending from the top, wherein it is held in this position by a spring 9 which is located in support a mounting block 1o held between the ends of the locking lever.

To the side of the jaws 5 and 6 are toothed segments 11a and 11b, which have a coarse toothing, which is selected so that they remain in engagement with each position of the jaws 5 and 6 and establish a synchronization between the movements of the two jaws. A deflector 12, which is fastened to the upper clamping jaw between the latter and the toothed segment 11a, prevents the belt webbing from inadvertently getting in between the toothed segments. The eccentric shaft 4 is pivotally supported in a bearing 13. A spring 14, which leads around the shaft 7 and biases the clamping jaw 6 in the direction indicated by the arrow a, also acts on the lower clamping jaw 6. e tensioning ratchet 15 used for tensioning the webbing is arranged behind the clamping jaws 5 and 6 of the passive pair, viewed in the tensioning direction. It contains a protruding with a handle 16 in the longitudinal direction over the housing 1 Clamping lever 17, the legs of which run parallel to the side plates and the top of the housing into the interior thereof. The clamping lever 17 is secured against inadvertent actuation by means of a catch 18 which engages on the side of it. A rocker 19 forms a further component of the tensioning ratchet 15. The rocker 19 consists of two side plates 19a and 19b which, together with an upper clamping piece 2o and laterally, are rotatably supported on a shaft 21 which holds the housing 1 in its upper Area interspersed. The side plate 19a of the rocker 19 passes through a ball catch 22 which is fastened in a counter-holder 23 which forms the lower clamping jaws of the active pair and is rigidly held between the side plates 19a and 19b of the rocker, for example by means of bolts. The clamping lever 17 is fastened with the free ends of its legs projecting into the interior of the housing, for example by means of screws, to the upper clamping piece 2o, which forms the upper clamping jaws of the active couple. In the side plate of the housing 1, a latching hole 24 is also provided, into which the ball latch 22 engages when the tensioning lever moves into its end position during its movement in the direction of arrow b. The tensioning lever 17 also contains a release pin 25 which bears against the rear side of the rocker 19 in the position of the tensioning lever shown in FIGS. 1 to 5. A stop 26 attached to the housing limits the movement of the tensioning lever 17 in the direction of arrow f into the position shown in FIG. 2. At the lower end of the rocker 19, a spring 27 engages, which is attached to the lower end of the housing and the rocker 19 in Attempted to rotate clockwise around the shaft 21 and stops in abutment against a stop 27a.

The loose end 28 of the webbing to be tensioned by the turnbuckle leads, as shown in FIG. 2, between the clamps bake 5 and 6 of the passive pair and the jaws 2o and 23 of the active pair, whereby it emerges in a straight line between the stop 26 and the bolt 2 from the housing. Around the bolt 2, as can also be seen in FIG. 2, the fixed end 29 of the webbing is placed around and fastened, for example, by means of the indicated seam.

In the embodiment of the jaws of the passive pair shown in FIGS. 6 and 7, the engagement surfaces 5a and 6a are provided with depressions 3o and projections 31 which are tooth-like, the arrangement of the depressions and projections and the synchronization of the clamping jaws by means of the Tooth segments 11a and 11b is reached that the projections of one jaw oppose the recesses of the other jaw and vice versa. In the example shown, the engagement surface 5a contains five projections and the engagement surface 6a contains four projections between which, as shown in Fig. 7, with increasing clamping action, i.e. the movement of the jaws in the direction of the arrows a loops around the loose end 28 of the webbing. The forced synchronization of the rotational movements of the two jaws 5 and 6 prevents ^ that the loose end 28 of the webbing is squeezed or damaged.

The operation of the turnbuckle described before is explained below. The tensioning and securing of the loose end 28 of the webbing is carried out as follows: After the locking pin 8 has been pulled back, the locking lever 3 is pivoted upward by 90 ° against the force of the spring 9 into the position B indicated in FIG. 2. This results in a rotation of the eccentric shaft 4, whereby the clamping jaw 5 moves away from the clamping jaw 6. The clamping of the two jaws 5 and 6 is released. Due to the synchronization by the toothed segments 11a and 11b, it is ensured that both in the position A and in the position B the jaws assume defined positions relative to one another. The loose end 28 of the webbing can then be pushed through the housing 1 between the clamping jaws 5 and 6 and the clamping piece 20 and the counter-holder 23 and further tightened by hand until it has applied itself to the load to be secured. Then the locking lever 3 is folded back into position A, whereby the eccentric shaft 4 engages the engagement areas 5a and 6a of the jaws

5 and 6 approximate each other. Due to the bias of the spring 14, a constant contact of both jaws 5 and

6 moved / belted on the belt so that it can only be pulled through the clamping jaws in the tensioning direction d.

The belt is further tensioned by the tensioning ratchet 15, in which the tensioning lever 17, which normally abuts the stop 26 and is locked with the catch 18 on the housing 1, is moved in the direction of the arrow e. During this movement, the tensioning piece 20 is brought closer to the counter-holder 23, which is mounted on the rocker 19. The rocker 19 is initially held in contact with the stop 27a by the spring 27, so that the webbing is clamped. In the course of the further movement of the tensioning lever 17 in the direction of the arrow e, the loose end 28 of the belt webbing continues in the tensioning direction and is pulled through the two clamping jaws 5 and 6. In the course of this process, the rocker 19 increasingly moves away from the stop 27a and pivots together with the tensioning lever 17 until the ball catch 22 engages in the catch hole 24. During a subsequent return of the tensioning lever 17 in the direction of arrow f, the rocker 19 initially remains in its position in which the ball catch 22 engages in the catch hole 24. Only when the disengaging pin 25 engages the rocker again is it released during the subsequent further movement of the tensioning lever and then brought back into their starting position by the force of the spring 27 and the further movement of the tensioning lever 17. In this way it is achieved that the clamping of the belt between the clamping piece 20 and the counter-holder 23 is released at the beginning of the return movement of the tensioning lever 17. When the clamping lever 17 has reached its end position, it engages in the catch 18 in contact with the stop 26. The tensioning process can be repeated as desired by further pivoting the tensioning lever 17 in the direction e and f.

To release the webbing, the safety lever 3 is again brought into position B. By. the resulting displacement of the eccentric shaft 4 removes the jaws 5 from the jaws 6 and the loose end 28 of the webbing can be pulled out in the direction C from the turnbuckle.

Claims

1. turnbuckle for webbing, in particular for load securing systems with a fastening for the fixed end of a webbing and with a tensioning ratchet for tensioning the webbing, characterized by two successive pairs of clamping jaws (5, 6; 20, 23) through which the webbing (28) runs through, the first passive pair of clamping jaws (5, 6) exerting its clamping action in the opposite direction (c) to the tensioning direction and the second active pair of clamping jaws (20, 23) exerting its clamping action in the tensioning direction (d) and the Ratchet forms.

2. Turnbuckle according to claim 1, so that the clamping jaws (5, 6) of the passive pair are provided on their opposite surfaces (5a, 6a) with interlocking recesses (30) and projections (31).

3. Turnbuckle according to claim 2, d a d u r c h g e k e n n z e i c h n e t that the recesses (30) and

Protrusions (31) on the mutually opposite surfaces (5a, 6a) of the clamping jaws (5, 6) are designed in the form of a coarse toothing which runs transversely to them.

4. Turnbuckle according to claim 3, characterized in that the toothing is straight, that the individual tooth surfaces adjoin each other at an obtuse angle and that the tooth tips are rounded.

5. Turnbuckle according to one of claims 2 to 4, d ad u r c h g e k e n n z e i c h n e t that the one jaw (5) contains at least two and the opposite jaws (6) at least three projections (31).

6. Turnbuckle according to one of the preceding claims, d a d u r c h g e k e n n z e i c h n e t that the

Pivoting movements of the clamping jaws (5, 6) around their pivots (4, 7) are synchronized by mechanical coupling.

7. Turnbuckle according to claim 6, characterized in that the synchronization of the pivoting movement of the clamping jaws (5, 6) is carried out by toothed segments (11a, 11b) which are attached laterally to the clamping pieces (6, 7) and whose axes of rotation with the axes of rotation of the pivots (4, 7) of the jaws collapse.

8. A turnbuckle according to claim 7, a deflector (12) which prevents the belt strap (28) from getting between the toothed segments (11a, 11b).

9. Turnbuckle according to one of the preceding claims, that the one clamping jaw (5) of the passive pair is mounted on an eccentric shaft (4) about which it can be pivoted by means of a securing lever (3).

10. Turnbuckle according to claim 9, characterized in that the securing lever (3) has a latching mechanism (8) which locks it when the jaws (5, 6) of the passive pair are closed.

11. Turnbuckle according to one of claims 7 to 10, d a d u r c h g e k e n n z e i c h n e t that the. The toothing of the toothed segments (11a, 11b) is chosen so coarsely that their teeth remain in engagement even when the clamping jaws (5, 6) are separated from one another.

12. Turnbuckle according to one of the preceding claims, d a d u r c h g e k e n n z e i c h n e t that at least one jaw (6) of the passive pair is resiliently biased against the direction of tension (d).

13. Turnbuckle according to one of the preceding claims, characterized in that the active ratchet forming the active pair of clamping jaws (20, 23) with a clamping lever (17) provided clamping piece (20) and a counter-holder (23) which in a rocker ( 19) which is pivotable about the same axis of rotation (21) as the clamping piece (20).

14. Turnbuckle according to claim 13, so that the rocker (19) is under resilient pretension (27) which urges it towards a stop (27a).

15. Turnbuckle according to claim 13 or 14, characterized in that the rocker (19) with a latching mechanism (22) is provided, which initially retains it when the clamping lever (17) is returned from its maximum deflection, so that when the clamping lever (17) is returned, the clamping connection between the clamping jaws (20, 23) of the active couple is opened and the webbing (28) is released by them.

16. Turnbuckle according to claim 15, d a d u r c h g e k e n n z e i c h n e t that the latching mechanism is formed by a ball catch (22) which engages in a bore (24) of the housing.

17. Turnbuckle according to one of claims 13 to 16, d a d u r c h g e k e n n z e i c h n e t that the ratchet contains a release member (25) which releases the latching mechanism (22) at a certain position of the tensioning lever (17).

18. Turnbuckle according to claim 17, so that the release member (25) consists of a stop on the tensioning lever (17) which engages on the rocker (19).

19. Turnbuckle according to one of the preceding claims d a d u r c h g e k e n n z e i c h n t that the two pairs of clamping jaws (5, 6; 20, 23) are arranged so that the loose end of the belt end (28) passes straight through them.