Hose clamp

• US 4,299,012 A
• Filed: 05/08/1979
• Issued: 11/10/1981
• Est. Priority Date: 05/08/1979
• Status: Expired

• Current Assignee: Hans Oetiker AG, Maschinen- und Apparatefabrik
• Original Assignee: Hans Oetiker
• Inventors: Oetiker, Hans
• Primary Examiner(s): Sakran, Victor N.
• Application Number:
  US06/036,980
• Time in Patent Office: 917 Days
• Field of Search: 24/19, 24/20 R, 24/20 CW, 24/20 EE, 24/20 TT, 24/20 S, 24/20 LS, 24/20 W, 24/256, 24/272, 285/252, 285/256, 285/242, 285/243, 248/74 R, 248/74 A
• US Class Current: 24/19
• CPC Class Codes: B65D 63/02 Metallic straps, tapes, or bands; Joints between ends thereof
• CPC Class Codes: F16L 21/00 Joints with sleeve or socket F16L13/00, F16L15/00, F16L17/00, F16L19/00, F16L25/0027, F16L27/00, F16L37/00 take precedence ; specially adapted to be made of plastics or to be used with pipes made of plastics F16L47/06; specially adapted for pipes of brittle material F16L49/02
• CPC Class Codes: F16L 33/025 tightened by deforming radially extending loops or folds
• CPC Class Codes: F16L 33/035 fixed by means of teeth or hooks
• CPC Class Codes: Y10T 24/1412 with tighteners
• CPC Class Codes: Y10T 24/1478 Circumferentially swagged band clamp
• CPC Class Codes: Y10T 24/1486 Screw locked band clamp
• CPC Class Codes: Y10T 24/1488 Swedged to lock band ends
• CPC Class Codes: Y10T 24/49 Fastener destructively secured by reshaping distortion force [e.g., ductile fastener]

Abstract

A clamp structure with a clamping band having open ends adapted to be mechanically interconnected by outwardly extending hooks in an inner band portion operable to engage in corresponding apertures provided in an outer band portion; at least one plastically deformable ear is provided in the clamp structure for tightening the clamping band about an object to be fastened by plastic deformation of the ear; a substantially gap-free transition in the circumferential direction from the inner band portion to the ring-like configuration of the clamp structure defined by the clamping band is obtained by the use of a tongue-like extension at the free end of the inner band portion which is operable to engage into a tongue-receiving aperture or channel provided in the outer band portion. In one embodiment, the mechanical connection consists of one suspension hook of tab-like configuration and one or more support hooks realized by cold-deformation and separated from the remaining band material by only a substantially transversely extending cut.

Claims

1. A clamp structure comprising clamping band means having open ends, means mechanically interconnecting the open ends of the band means including several outwardly extending hook means in an inner band portion operable to engage in corresponding aperture means provided in an outer band portion, and means in the clamp structure for tightening the clamping band means about an object to be fastened, characterized in that at least one hook means is a suspension hook means adapted to extend through a corresponding aperture means, and in that at least another hook means is a cold-deformed support hook means having force-engaging abutment surface means extending out of the plane of said inner band portion while said support hook means is integral with said inner band portion over at least a substantial part of its remaining contour, said suspension hook means being operable to initially engage the outer band portion by extending into the corresponding aperture means and thereafter to guide the inner and outer band portions with respect to one another while the circumferentially directed clamping forces which occur during tightening of the clamp structure by said tightening means, are absorbed principally by said cold-deformed support hook means engaging with the abutment surface means thereof against the edge of a respective aperture means.

28. A clamp structure according to claim 1, 2,3,4,5,6,7,8, 9, 10, 11,12,13,14,19,20,21,22,23,24 or 25, characterized in that the means for tightening the clamping band means includes at least one plastically deformable ear means and in that the inner band portion extends underneath the opening of an ear means and terminates a distance therebeyond in the circumferential direction.

30. A clamp structure according to claim 1, 2, 3, 4, 5, 6, 7 or 8, characterized in that the inner and outer band portions overlap only within the area of the mechanical interconnecting means so that the opening underneath the ear means is not covered by the inner band portion.

31. A clamp structure according to claim 30, characterized by further means near the free ends of the inner and outer band portions to assure a substantially gap-free transition in the circumferential direction from the inner band portion of the ring-like configuration of the clamp structure defined by the band means, when the clamp structure is tightened by deformation of the ear means.

32. A clamp structure according to claim 31, characterized in that the further means includes a tongue means at the free end of the inner band portion, which is operable to engage into an aperture means provided in the corresponding location of the outer band portion.

33. A clamp structure according to claim 32, characterized in that the outer band portion is provided with an outwardly extending step-like portion, and in that said last-mentioned aperture means is provided at least within the area of said step-like portion.

34. A clamp structure according to claim 33, characterized in that said step-like portion displaces the outer band portion relative to the ring-like configuration defined within the area of overlap by the inner band portion, by a radial distance approximately equal to the thickness of the band material.

35. A clamp structure according to claim 32, characterized in that said tongue means is relatively flat in transverse cross section.

36. A clamp structure according to claim 32, characterized in that the tongue means is generally convexly or concavely curved in transverse cross section.

37. A clamp-like structure according to claim 32, characterized in that an insert means of band material is provided in said clamp structure at least within the area of the means for tightening the clamping band means and of the band portions next adjoining the tightening means, and still further means at the free ends of said insert means and in the corresponding areas of the overlying band portions to assure a substantially gap-free transition in the circumferential direction from the free ends of the insert means to the ring-like configuration defined by the band means.

38. A clamp structure according to claim 37, characterized in that the still further means include tongue means at each free end of the insert means and tongue-receiving aperture means in corresponding areas of said last-mentioned band portions, into which a respective tongue means is operable to engage during contraction of the ear means.

39. A clamp structure according to claim 38, characterized in that each tongue-receiving aperture means is located at least within the area of an outwardly extending step-like portion provided in the corresponding band portion of the band means.

40. A clamp structure according to claim 38, characterized in that each of said last-mentioned tongue means is relatively flat in transverse cross section.

41. A clamp structure according to claim 34, characterized in that each of said last-mentioned tongue means is generally convexly or concavely curved in transverse cross section.

42. A clamp structure according to one of claims 1, 2, 3, 4, 5, 6, 7 or 8, characterized in that the means for tightening the band means includes at least one plastically deformable ear means integral with a partly circumferentially extending band portion on each side thereof to form a unitary bridge-like clamping member, the two partly circumferentially extending band portions each forming an inner band portion and containing said hook means which engage in aperture means provided in the overlapping outer end portions of the band means.

43. A ring-like clamp structure according to claim 42, characterized by further means near the free end of each inner band portion of the bridge-like clamping member and in the corresponding area of the outer band portions of the band means to assure a substantially gap-free transition in the circumferential direction from said inner band portions to the ring-like configuration defined by the band means, when the clamp structure is tightened by deformation of the ear means.

44. A clamp structure according to claim 43, characterized in that each further means includes a tongue means at the free end of each partly circumferentially extending band portion of the bridge-like clamping member, which is operable to engage into a respective tongue-receiving aperture means provided in the corresponding location of a respective outer band portion of the band means.

45. A clamp structure according to claim 44, characterized in that the band means is provided with outwardly extending step-like portions leading to the outer overlapping band portions, and in that a respective one of said last-mentioned tongue-receiving aperture means is provided at least within the area of the corresponding step-like portion.

46. A clamp structure according to claim 42, characterized in that at least one outer band portion of the band means is adapted to be secured to a respective inner band portion of the bridge-like clamp structure by engagement of the suspension hook means with the corresponding aperture means in the outer band portion and by thereafter bending the suspension hook means toward the flat band material of the band means.

47. A clamp structure according to claim 42, characterized by slider-like connecting means for securing together an inner band portion of the bridge-like clamp structure and an outer band portion of said band means, said slider-like connecting means defining an internal cross section approximately complementary to the thickness and width of overlapping inner and outer band portions.

2. A clamp structure comprising clamping band means having open ends, means mechanically interconnecting the open ends of the band means including several outwardly extending hook means in an inner band portion operable to engage in corresponding aperture means provided in an outer band portion, and means in the clamp structure for tightening the clamping band means about an object to be fastened, characterized in that at least one hook means is a suspension hook means adapted to extend through a corresponding aperture means and operable to guide the inner and outer band portions relative to each other during initial contraction of the ear means, and in that at least another hook means is a cold-deformed support hook means having force-engaging abutment surface means operable to absorb the circumferentially directed forces caused by tightening of the clamp structure as a result of the contraction of the ear means, by engagement with the edge of a respective aperture means, each cold-deformed support hook means being formed by a portion of band material pressed-out of the band means, the cold-deformed support hook means being non-integral with the normal configuration of the band material substantially only along a single generally transversely extending cut defining that end of the cold-deformed hook means, which constitutes its force-engaging abutment surface means.

3. A clamp structure according to claim 2, characterized in that the pressed-out portion defining a cold-deformed support hook means is integral with the adjoining parts of the band material on all sides thereof except within the area of the generally transversely extending cut.

4. A clamp structure according to claim 3, characterized in that the abutment surface means is generally convexly shaped relative to the flat band material, as viewed in a cross section including the transverse cut.

5. A clamp structure according to claim 4, characterized in that a cold-deformed support hook means tapers in height and width in the circumferential direction away from its abutment surface means.

6. A clamp structure according to claim 3, characterized in that the suspension hook means is a substantially rectangular, tab-like hook bent out of the band material which is defined by a substantially U-shaped cut in the band means.

7. A clamp structure according to claim 6, characterized in that one suspension hook means is followed by at least one hook means.

8. A clamp structure according to claim 7, characterized by means preventing incorrect assembly of the hook and aperture means.

9. A clamp structure according to claim 8, characterized in that the means preventing incorrect assembly is realized by a circumferential spacing between the suspension hook means and the next adjacent support hook means as also by a circumferential spacing of the corresponding aperture means in the outer band portion which are different from the circumferential spacing of the two support hook means and their respective aperture means.

10. A clamp structure according to claim 8, characterized in that the means preventing incorrect assembly is realized by a length of the web portion of the outer band means from the last aperture means to the free end thereof which is larger than the length in the circumferential direction of the web portion between adjacent aperture means.

11. A ring-like clamp structure according to claim 10, characterized by further means near the free end of the inner band portion and in the corresponding area of the outer band portion to assure a substantially gap-free transition in the circumferential direction from the inner band portion to the ring-like configuration of the clamp structure defined by the band means, when the clamp structure is tightened by deformation of the ear means.

12. A clamp structure according to claim 11, characterized in that the further means includes a tongue means at the free end of the inner band portion, which is operable to engage into a tongue-receiving means provided in the corresponding location of the outer band portion.

13. A clamp structure according to claim 12, characterized in that the outer band portion is provided with an outwardly extending step-like portion, and in that said tongue-receiving means is an aperture means provided at least within the area of said step-like portion.

14. A clamp structure according to claim 13, characterized in that said step-like portion displaces the outer band portion relative to the ring-like configuration defined within the area of overlap by the inner band portion, by a radial distance approximately equal to the thickness of the band material.

15. A clamp structure according to claim 14, characterized in that said tongue means is relatively flat in transverse cross section.

16. A clamp structure according to claim 13, characterized in that said tongue means is generally curved in transverse cross section.

17. A clamp structure according to claim 13, characterized in that said tongue means is generally convexly curved in cross section.

18. A clamp structure according to claim 13, characterized in that said tongue means is generally concavely curved in cross section.

19. A clamp structure according to claim 12, characterized in that the inner band portion is provided with at least one circumferentially extending, generally convexly shaped embossment means in its area underneath the opening of the means for tightening the band means to be engaged during tightening thereof by the corner-like transitions between the band means and leg portions of the tightening means, said leg portions riding up on the embossment means and thus pressing down the inner band portion within the area of the embossment means.

20. A clamp structure according to claim 12, characterized in that the tongue-receiving means is a channel-shaped recess means of a depth, width and length sufficient to accommodate the tongue means.

21. A clamp structure according to claim 20, characterized in that the channel-shaped recess means is formed by a pressed-out portion within the center area of the band means defined by transversely spaced, generally circumferentially extending cuts.

22. A clamp structure according to claim 21, characterized in that the cuts are interrupted cuts leaving therebetween web portions connecting the remaining band means with the pressed-out portion.

23. A clamp structure according to claim 21, characterized in that said cuts commence within the area of a step-like portion in the band means and terminate within the area of another step-like portion of the recess means, said pressed-out portion of the recess means failing to follow the first-mentioned step-like portion.

24. A clamp structure according to claim 23, characterized in that said first-mentioned step-like portion displaces the outer band portion relative to the ring-like configuration defined within the area of overlap by the inner band portion, by a radial distance approximately equal to the thickness of the band material.

25. A clamp structure according to claim 21, characterized in that the number of aperture means is greater than the number of hook means to enable the realization of a clamp structure with different diameters, the length of the tongue and tongue-receiving means being such that all diameters possible by the number of aperture means can be realized devoid of gaps in the object-engaging surface of the clamp structure.

26. A clamp structure according to claim 20, characterized in that said tongue means is relatively flat in transverse cross section.

27. A clamp structure according to claim 20, characterized in that said tongue means is generally convexly or concavely curved in transverse cross section.

29. A clamp structure according to claim 12, characterized in that the means for tightening the clamping band means includes at least one plastically deformable ear means having two generally outwardly extending leg portions interconnected by a generally circumferentially extending bridging portion, and a generally circumferentially extending, groove-like reinforcing means in said bridging portion.

48. A clamp structure according to claim 11, characterized in that the band means is of ladder-type band material, and in that the tongue-receiving aperture means are formed by removal of web portions between openings.

49. A clamp structure according to claim 12, characterized in that the band means is of ladder-type band material having a number of openings with transversely extending webs therebetween, and in that a tongue-receiving means is formed by bent-out web portions pressed-out by the underlying tongue means.

50. A clamp structure, comprising clamping band means having open ends, means mechanically interconnecting the open ends of the band means including outwardly extending hook means in an inner band portion operable to engage in corresponding aperture means provided in an outer band portion, and at least one means in the clamp structure for tightening the clamping band means about an object to be fastened, characterized by a tongue means at the free end of the inner band portion, which is operable to engage into a tongue-receiving means provided at least within the area of an outwardly extending step-like portion provided in the outer band portion to assure a substantially gap-free and stepless transition in the circumferential direction from the inner band portion to the ring-like configuration of the clamp structure defined by the band means upon tightening of the clamp structure by said tightening means.

51. A clamp structure according to claim 50, characterized in that said hook means include at least one suspension hook means adapted to extend through a corresponding aperture means and operable to guide the inner and outer band portions relative to each other during initial tightening of the clamping band means by said tightening means and at least one support hook means having force-engaging abutment surface means operable to absorb circumferentially directed forces caused by contraction of the ear means.

52. A clamp structure according to claim 50, characterized in that the hook means are formed by circumferential tab-like members extending out of the inner band portion in a generally outward direction, two substantially parallelly extending tab-like members each being provided spaced in the transverse direction of the inner band portion to leave therebetween a relatively narrow center web portion, the aperture means being defined by generally rectangular cut-out portions in the outer band portion which are complementary in length to the tab-like members to receive the same therein.

53. A clamp structure according to claim 52, characterized in that each tab-like member, before being bent out, is defined by a cut of parallelogram-like shape in the inner band portion whose leading and trailing faces slant outwardly away from the respective band portion end.

54. A clamp structure according to claim 50, 51, 52 or 53, characterized in that said tongue-receiving means is an aperture means provided at least within the area of said step-like portion.

55. A clamp structure according to claim 50, characterized in that the means for tightening the clamping band means includes at least one plastically deformable ear means.

56. A clamp structure according to claim 50, characterized in that the means for tightening the clamping band means includes threaded means for reducing the diametric dimension of the band means.