DE1058325B - Closure for tension bands and process for its manufacture - Google Patents

Description

The invention relates to a closure for tightening straps, in particular hose clamps, which consists of consists of a screw inserted into a housing at one end of a flexible metal band, which cooperates with a toothing arranged at the other end of the belt, as well as a method for Manufacture of this fastener.

In such closures, it is known to counter the screw on the housing receiving it Secure axial displacement so that it can not come free from the housing when the lock is open. To achieve this definition it has been proposed, inter alia, the worm housing after Introducing the screw to deform so that it engages in a threadless part of the screw. In the meantime it is difficult, with this arrangement, a sufficiently precise axial fixing of the worm on the To achieve housing and to avoid jamming of the worm on the housing during machine production. According to another known proposal, the screw is against axial displacement by a Ring secured, which is initially open and after inserting the worm into the housing in the gap of the housing and pressed against a threadless shaft part of the worm from the sides and is closed. It is disadvantageous that the locking ring with its ends after Pressing is covered by the housing, so that you can not see whether the ring is properly closed. If this is not the case, it can easily happen that the locking ring becomes loose when using such tensioning straps bends open under the action of the tension and detaches from the worm, making the clamp unusable will. Here, too, it happens that the worm when pressing the locking ring on Housing is jammed.

The invention overcomes this disadvantage. She also uses one to fix the worm Circlip, which is attached to a threadless shaft part of the worm without rotation lock and engages in a gap in the housing. The invention is characterized in that the screw receiving Housing at its head end in front of the housing gap one compared to that of the worm thread enclosing housing originally expanded arcuate approach that after Pushing through the screw provided with the locking ring by mechanical narrowing the Circlip of the screw engages behind on its side facing the head of the screw and the Secures screw without affecting its rotatable bearing against axial displacement.

This design has the advantage that the locking ring for tightening straps can be closed before the screw is inserted
and its method of manufacture

Applicant:

C W. Cheney and Son Limited
and Charles William Cheney,

Hockley, Birmingham, Warwickshire
(Great Britain)

Representative: Dipl.-Ing. G. "Weinhausen, patent attorney,
Munich 22, Widenmayerstr. 46

Charles William Cheney, Hockley, Birmingham,
Warwickshire (UK),
has been named as the inventor

in the housing on the worm and therefore already when inserting the worm into the housing can determine whether the locking ring is properly closed, completely encompasses the shaft of the worm and has a sufficiently loose fit that it does not inhibit the rotation of the screw. Here can the locking ring should be attached so that its joint in the gap and in a known manner on the Outside of the housing is so that you can always convince yourself that the ring is closed is. It is then also accessible with its ends and can be pushed in from the outside if necessary will.

According to the invention, the closure is produced in such a way that the one with the locking ring provided screw is pushed into the housing through the arched extension, the locking ring in brought the area of the housing gap and then the arcuate extension of the housing

+5 is narrowed behind the face of the locking ring facing the screw head.

The drawing shows an example of the implementation of a tape fastener according to the invention, and although shows

Fig. 1 is a side view of a lock housing,
Fig. 2 the associated worm with the locking ring,

3 shows a side view of the two parts joined together with the screw still unsecured,

90 9 528/228

Claims (2)

4 shows a side view of the same parts secured and in the closed position of the band, FIG. 5 shows the closure according to FIG. 4 in longitudinal section, FIG. 6 shows a cross section along line AA of FIG. 5, and FIG. 7 shows an end view of the " 1 to 6 has a tubular housing 1 which is open at both ends and is fastened with a base 2 to one end 3 of a flexible metal band 4. The base 2 has fastening lugs protruding in the longitudinal direction 2 ', which are bent to match the band's curvature and welded to the lower surface of the band end 3 so that the housing 1 is permanently connected to the band The housing includes a worm 8 which has a threadless shaft part 9 and a head 10 with a slot 15 for inserting a screwdriver Housing 1 and engages with its thread 11 in the locking position according to FIGS. 4 and 5 in transverse teeth or recesses 12, which are located at the other end of the tape 13 so that the fastener tape can be tightened or loosened by turning the worm. The worm 8 is fixed to the housing 1 against axial displacement by a locking ring 14. According to FIG. 7, this locking ring is made from a U-shaped blank which is bent with its legs 18 onto the threadless shaft part 9 of the worm 8 with a loose fit. The locking ring 14 and the screw 8 are combined before the screw is pushed into the housing. As can be seen from FIG. 7, the locking ring has a joint 17 which is created when the legs 18 are bent around the neck 9 of the worm and is always clearly visible. On the lower part 19 of the ring body there is a known angled extension 20, which comes to rest on the free end of the tape when the tape is closed and thereby additionally secures the tape against loosening. The arcuate extension 7 of the housing 1 is originally so large in diameter according to FIG. 3 that its opening 21 allows the already bent locking ring 14 of the worm to pass through. After the screw has been inserted into the housing, the head ring 7 is compressed or bent down so that its front face 22 engages behind the front surface 23 of the locking ring at the top approximately halfway If the parts according to FIGS. 5 and 6 are combined, the locking ring 14 with the worm can no longer be released from the housing 1. Claims : 1. Closure for tightening straps, in particular for hose clamps, consisting of a screw inserted into a housing at one end of a flexible metal band, which cooperates with a toothing arranged at the other end of the band and which is attached to its threadless shaft part without rotation inhibition, into a gap of the The locking ring engaging the housing is secured against axial displacement, characterized in that the housing (1 ) receiving the worm (8) has an arcuate extension (7 ) at its head end in front of the housing gap (6) compared to the housing (1) surrounding the worm thread ) which, after the screw provided with the securing ring (14) has been pushed through, engages behind the securing ring of the screw on its side facing the head (10) of the screw by mechanical constriction and secures the screw (8) against axial displacement without impairing its rotatable mounting. 2. A method for producing a closure for tensioning straps according to claim 1, characterized in that the screw (8) provided with the securing ring (14 ) is pushed through the arcuate projection (7) into the housing (1) , the securing ring (14) in brought the area of the housing gap (6) and then the arcuate extension (7) of the housing is narrowed behind the end face (23) of the locking ring facing the screw head (10). Considered publications:
German Patent No. 921,961;
Swiss Patent No. 299 011;
British Patent Nos. 708 444, 677 749,
807, 559,652; U.S. Patent Nos. 2,386,629, 2,345,832. 1 sheet of drawings © 909 528/228 5.59