GB2140497A

GB2140497A - Worm drive clip

Info

Publication number: GB2140497A
Application number: GB08412691A
Authority: GB
Inventors: Samuel Bakdahl
Original assignee: Individual
Current assignee: Individual
Priority date: 1983-05-25
Filing date: 1984-05-18
Publication date: 1984-11-28
Also published as: DK233083A; DE3419085C2; FR2546579B3; GB8412691D0; DK157626C; GB2140497B; DK157626B; FR2546579A1; DK233083D0; DE3419085A1

Abstract

A worm drive clip (1) comprises a housing (3) having an upper part (5) and a bottom part (6) for enclosing a worm screw (4) and a band (2) with transverse ribs (8) and transverse openings (9). The bottom part (6) comprising a flap (10) protruding in the longitudinal direction of the housing (3) is inserted in one transverse opening (9) of the band (2) between a pair of adjacent transverse ribs (8). With this construction it is possible to fasten a housing (3) to a perforated band (2) in situ, a length of band (2) being cut a little longer than the periphery of a hose to be clamped. <IMAGE>

Description

SPECIFICATION Worm drive clip This invention relates to a worm drive clip of the kind comprising a housing in which a driving worm screw is journalled, said housing comprising an upper part and a bottom part for enclosing the worm screw, and a flexible band inserted in the housing, said band having transverse ribs and transverse openings for permitting tightening of the band about an object, such as a hose, by rotating the worm screw about its longitudinal axis.

The worm drive clip according to the invention is characterized in that the housing bottom part comprising a flap of a ductile, bendable material projecting in the longitudinal direction of the housing to be inserted in a transverse opening of the band between a pair of adjacent transverse ribs. Thus, a very simple worm drive clip is obtained which can be used for the known bands of an arbitrary length having transverse ribs and openings, seeing that a certain cut length of band at its one end is fastened to the bottom part of the housing of the worm drive clip by inserting the projecting flap thereof in a transverse opening between a pair of adjacent transverse ribs in the band and a subsequent bending backwards of the flap to a position parallel to the remaining bottom part of the housing for clamping of the band end to the bottom part of the housing.The other free end of the band is then inserted in the worm drive housing in a known way for engagement with the driving worm screw and a subsequent tightening of the band around a pipe, a hose or the like which it is desired to tighten along its periphery.

The bottom part of the housing is characterized in that the bottom part of the housing having a protruding intermediate piece between the upper part of the housing and the flap, and that the intermediate piece comprising a transverse opening for an unperforated band of the same width as the length of the transverse opening, the latter having the same length as the transverse openings in the band for engagement with the driving worm screw of the housing.

By these features is achieved that the worm drive clip also is applicable for extremely large pipe or hose diameters, as the unperforated band may be inserted through the transverse opening of the intermediate piece and a subsequent bending backwards of the band to a position parallel to the flap, and wherein the other end of the unperforated band is connected to the band having transverse ribs and openings by inserting the unperforated band in one of said openings and subsequently bending its free end backwards to a position parallel to the band having transverse ribs and openings. By means of a short cut band piece having transverse ribs and openings engaging the driving worm screw of the housing, the unperforated band can be tightened by means of the housing of the worm drive clip.

The transverse opening of the intermediate piece may provide a space for inserting an unperforated band in at least two layers.

By this feature is achieved that the unperforated band may be put almost twice around the pipe or hose, which it is desired to tighten along its periphery, so that the cut band having transverse ribs and transverse openings may be used to clamp two windings of unperforated band. The transverse opening of the intermediate piece has the same length as the width of the unperforated band and preferably such a width that the second winding of the unperforated band is not given a too small bending radius along its extension through the transverse opening of the intermediate piece.

The invention will now be described in more detail by way of example and with reference to the drawings in which: Figure 1 shows a section of a worm drive clip according to the invention having a flexible band with transverse ribs and transverse openings, Figure 2 the bottom part of the housing of the worm drive clip seen from above, Figure 3 the bottom part of the housing of the worm drive clip seen from one side, Figure 4 a cut piece of a band having transverse ribs and transverse openings, Figure 5a worm drive clip having a short piece of band with transverse ribs and transverse openings for tightening an unperforated and in one single winding or turn, Figure 6the worm drive clip of Figure 5 wherein the unperforated band, partly in section, is laid in two windings or turns, and Figure 7the bottom of the housing having a transverse opening in the intermediate piece.

Figure 1 shows the main part of a worm drive clip 1 with a band 2 and of the kind comprising a housing 3 having a driving worm screw 4 inserted therein, which worm screw can be turned by means of a tool, such as a wrench or a screwdriver. The housing comprises an upper part 5 and a bottom part 6 for enclosing the worm screw 4, and between the bottom part 6 and the screw 4 it comprises a passage for enclosing the band 2 inserted in the housing 3, which band 2 has transverse ribs 8 and transverse openings 9. In the longitudinal direction of the housing 3 the bottom part 6 has a projecting flap 10 of a ductile, bendable material to be inserted in one opening 9 of the band 2 between a pair of adjacent transverse ribs 8.Figure 1 shows the flap 10 being inserted in one of the openings 9 at the one end of the band 2 and bent rearwards to the shown position parallel to the band 2 and to the bottom part 6 of the housing for clamping of the band end to the bottom part 6 of the housing 3.

The upper part 5 of the housing 3 comprises a fastening flap at both sides, said flaps being brought past a groove 12 in the bottom part 6 and bent around the bottom part 6 for fastening thereof to the upper part 5. The dotted line in Figure 2 shows the flap 10 before its angular bending and in unbroken lines the angularly bent flap 10. The flap 10 may as shown be bent along a line perpendicular to the length axis of the botom part 6, but may also be bent along a line forming a small angle with the cross direction of the bottom part. The latter angle has the same size as the angle of the transverse openings 9 with the rightangled cross direction of the band shown in Figure 4.The one side 14 of the flap 10 may have an inclining cut, viz. under the same small angle with the longitudinal direction ofthe bottom part 6 as the angle of the transverse openings 9 with the 909cross direction of the clamp. Thereby the flap 10 may be bent backwards, whereby no corner of the flap protrudes outside the band 2. Furthermore, a longitudinal opening 15 is performed in the bottom part 6 which opening provides a space for the driving worm screw 4, as the threads thereof project through the transverse openings 9 in the band 2 and a certain distance down into the opening 15.Furthermore, the bottom part 6 comprises an intermediate piece 16 wherein a cross opening 17 is performed being able to pass through an unperforated band 18 (Figure 5) of an arbitrary length and made of a ductile, bendable material.

Figure 5 shows the housing 3 of the worm drive clip 1 wherein the bottom part 6 engages a short cut length of a band 2 having transverse ribs 8 and transverse openings 9, through a transverse opening 9, og which an end of an unperforated band 18 has been inserted and bent backwards. Said band 18 is at its opposite end put through the transverse opening 17 in the bottom part 6 in the intermediate piece 16 between the hosing 3 and the flap 10. This construction is suitable in cases where the band 2 should have been extended over a very large diameter, seeing that a substantial part of the costly band 2 has been substituted by a cheaper, unperforated band 18.Figure 6 shows the same as Figure 5, however, with the unperforated band 18 being put twice through thetrnsverse opening 17, firstly with a bent flap 19 and secondly with an additional winding 20.

Figure 7 illustrates that the transverse opening 17 having the same length as the width of the unperforated band 18, may have a larger extension in the longitudinal direction of the bottom part 6 than shown in Figure 2. The unperforated band 18 has the same width as the length of the transverse opening 17 which again has the same length as the length of each transverse opening 9 in the band 2 adapted for engaging the driving worm screw 4 of the housing 3.

Figures 5 and 6 show in section a part of the unperforated band 18, 20. Forthe sake of clarity also the band 2 provided with transverse ribs 8 and transverse openings 9 is shown in section.

The embodiment of this invention as shown in Figure 1 is suitable for clips or clamps of small dimensions, e.g. for clamping diameters of 10 mm to 100 mm and the embodiment of Figures 5 and 6 is suitable for clamping diameters of 50 mm to 100 cm or more. Thus, from a roll of band with transverse ribs 8 and transverse openings 9 both hose clamps, clips or binders, straps, cable clamps, pipe clamps, pipe binders for arbitrary diameters of hoses and pipes or cables may be prepared in situ, so that a repairer does not have to bring along a large selection of worm drive clips for different hose diameters; it is sufficient to bring a number of housings 3 comprising upper parts 5, bottom parts 6 and driving worm screws 4, and a roll of band 2 comprising transverse ribs 8 and transverse openings 9, and possibly also a roll of unperforated band 18 for hoses of very large diameters.

This also applies for workshops and factories dealing in hose clips, seeing that their store of such clips may be considerably reduced, anyway as the worm drive housings 3 themselves are concerned, which may be used for all cut off or not yet cut off lengths of perforated or unperforated 18 bands.

Claims

1. Worm drive clip of the kind comprising a housing (3) in which a driving worm screw (4) is journalled, said housing (3) comprising an upper part (5) and a bottom part (6) for enclosing the worm screw (4), and a flexible band (2) inserted in the housing (3), said band having transverse ribs (8) and transverse openings (9), characterized in that the housing bottom part (6) comprising a flap 10) of a ductile, bendable material projecting in the longitu dinal direction of the housing (3) to be inserted in a transverse opening (9) of the band (2) between a pair of adjacenttransverse ribs (8).

2. Worm drive clip according to claim 1, characterized in that the bottom part (6) of the housing (3) having a protruding intermediate piece (16) between the upper part (5) of the housing (3) and the flap (10), and that the intermediate piece (16) comprising a transverse opening (17) for an unperforated band (18) of the same width as the length of the transverse opening (17), the latter having the same length as the transverse openings (9) in the band (2) for engagement with the driving worm screw (4) of the housing (3).

3. Worm drive clip according to claim 2, characterized in that the transverse opening (17) of the intermediate piece (16) providing a space for inserting an unperforated band (18) in at least two layers.