Worm drive hose clip

• US 20030188402A1
• Filed: 04/02/2003
• Published: 10/09/2003
• Est. Priority Date: 04/03/2002
• Status: Active Grant

• Current Assignee: Norma Germany Gbmh
• Original Assignee: Rasmussen GmbH (NORMA Group SE)
• Inventors: Keller, Werner, Mann, Stephan, Stichel, Willi, Redemann, Hartmut
• Granted Patent: US 6,845,549 B2
• Time in Patent Office: Days
• US Class Current: 24/274R
• CPC Class Codes: F16L 33/08 in which a worm coacts with a part of the hose-encircling member that is toothed like a worm-wheel
• CPC Class Codes: Y10T 24/1427 Worm and tooth
• CPC Class Codes: Y10T 24/1457 Metal bands

Abstract

A worm drive hose clip has a clamping strap with overlapping end sections, a clamping screw, and a housing. The radially outer end section has thread elements engaging the threaded screw shaft. The radially inner end section is connected to the housing bottom having a butt joint with interlocking undercuts. The bottom has a first transverse border with tongues arranged on opposite sides of the butt joint and projecting outwardly into an opening of the radially inner end section. A second straight transverse border of the bottom is supported on first grooves impressed radially inwardly in the clamping strap and opening toward the second transverse border. A second groove adjoins the opening and supports the bottom. The radially inner edges of the first and second circumferential grooves are aligned with an underside of the bottom and pass continuously into an inner side of the radially inner end section.

Claims

1. A worm drive hose clip comprising:

a clamping strap having overlapping end sections;

a clamping screw comprised of a head and a threaded shaft;

a housing enclosing the overlapping end sections and the threaded shaft of the clamping screw;

wherein a radially outwardly positioned one of the overlapping end sections is provided with thread elements engaging the threaded shaft;

wherein the radially inwardly positioned one of the overlapping end sections is positive-lockingly connected to a bottom of the housing, wherein the housing supports the clamping screw in a circumferential direction of the worm drive hose clip;

wherein the housing is comprised of a housing band having ends, wherein the ends are connected to form a butt joint at the bottom of the housing and have edges delimiting the butt joint, wherein the edges have undercuts interlocked with one another to secure the butt joint;

wherein the bottom of the housing has a first transverse border facing the head and the first transverse edge has a tongue, respectively, on opposite sides of the butt joint, wherein the tongues are radially outwardly bent and project together into an opening provided in the radially inner end section of the clamping strap;

wherein the bottom of the housing facing away from the head of the clamping screw has a second transverse border of a continuous straight configuration;

wherein the clamping strap has first grooves pressed radially inwardly out of the clamping strap;

wherein the second transverse border is supported on the first grooves and wherein the first grooves open toward the second transverse border;

wherein the clamping strap has a second groove adjoining the opening common to the tongues and arranged proximal to the head, wherein the second groove is open toward the bottom and wherein the bottom is supported on the second groove;

wherein the radially inner end section of the clamping strap is free of a radially outwardly oriented bent portion for receiving the bottom;

wherein the first and second grooves extend in the circumferential direction of the worm drive hose clip and wherein a radially inner edge of each one of the first and second grooves is aligned with an underside of the bottom and has a continuous transition into an inner side of the radially inner end section.

2. The worm drive hose clip according to claim 1, wherein the clamping strap has a radially outer side provided with several parallel grooves extending at a slant to a longitudinal direction of the clamping strap, wherein the parallel grooves form the thread elements for engagement of the threaded shaft, and wherein the clamping strap has a radially inner side having a planar configuration or a slightly undulated shape, wherein a maximum height of the undulated shape is up to 60% of a maximum bottom thickness of the thread elements.

3. The worm drive hose clip according to claim 2, wherein first flanks of the thread elements and of a thread stay of the clamping screw, which first flanks are pressed against one another, have outer and inner ends with first radii and have a first steepness of approximately 90°

when the clamping strap is stretched, and wherein second flanks of the thread elements and a third flank of the thread stay have ends with second and third radii greater than the first radii and have a second steepness smaller than the first steepness.

4. The worm drive hose clip according to claim 3, wherein:

the first radii are substantially identical relative to one another;

wherein a first one of the second radii on a free end of the second flanks of the thread elements is smaller than a second one of the second radii on foot ends of the second flanks of the thread elements); and

wherein a first one of the third radii on a free end of the third flank of the thread stay is greater than a second one of the third radii on a foot end of the third flank of the thread stay.

5. The worm drive hose clip according to claim 1, wherein the housing has a lateral bracket only on a right side of the housing, viewed in a direction from the head to the threaded shaft of the clamping screw when the clamping screw is above the clamping strap, wherein the bracket has a wall provided radially outside of the radially outer end section of the clamping strap and adjacent to a free end of the threaded shaft, wherein the wall of the bracket has radial wall portion and a slantedly descending wall portion slantedly descending from a curved ridge of a top part of the housing tangentially to the radial wall portion, wherein the wall of the bracket has, adjacent to a central section of the threaded shaft, a curved wall portion, resting against the central section of the threaded shaft, and an axial wall portion connecting the curved wall portion with the radial wall portion.

6. The worm drive hose clip according to claim 5, wherein the curved wall portion and the axial wall portion are formed by impressing sidewalls of the housing such that a transversely extending wall portion is formed between the slantedly descending wall portion, the curved wall portion and the axial wall portion.

7. The worm drive hose clip according to claim 6, wherein a plane of the transversely extending wall portion crosses approximately a center of a section of the clamping screw being in thread engagement with the clamping strap.

8. The worm drive hose clip according to claim 6, wherein a free edge of a top part of the housing facing the head of the clamping screw is provided with teeth and wherein the head of the clamping screw has a radial surface positioned transversely to an axis of the clamping screw and resting against the teeth.

9. The worm drive hose clip according to claim 6, wherein the bottom of the housing in the circumferential direction of the worm drive hose clip has a curvature having a radius of curvature matching substantially a radius of a circumference of a hose to be clamped by the worm drive hose clip on a pipe, wherein the bottom in the circumferential direction is shorter than the top part of the housing and is positioned relative to a free end of the clamping screw such that a greatest possible number of thread sections of the threaded shaft of the clamping screw is in engagement with the thread elements.

10. The worm drive hose clip according to claim 1, wherein the opening for receiving the tongues, viewed in a direction from the head to the threaded shaft of the clamping screw, has a spacing from a first edge of the clamping strap positioned to the right of the clamping screw and wherein the spacing is smaller than a spacing of the opening from a second edge of the clamping strap opposite the first edge.

11. The worm drive hose clip according to claim 1, wherein the first transverse border of the bottom projects at a slant relative to the tongues and in a direction toward the head.