US3672004A

US3672004A - Adjustable strap

Info

Publication number: US3672004A
Application number: US79167A
Authority: US
Inventors: Thomas R Smith
Original assignee: Pyramid Inc
Current assignee: Pyramid Inc
Priority date: 1970-10-08
Filing date: 1970-10-08
Publication date: 1972-06-27
Anticipated expiration: 1989-06-27

Abstract

An adjustable strap assembly is connectable between two variably spaced points to provide a holding tension therebetween. The strap assembly includes two buckles and an elongated belt connected to the buckles to provide three strands between the buckles. The relative spacing between the buckles is selectively adjustable to alter the effective length of the strap assembly.

Description

United States Patent Smith 1 June 27, 1972 ADJUSTABLE STRAP [72] Inventor: Thomas R. Smith, Newton, Iowa [73] Assignee: Pyramid, Inc., Newton, Iowa [22] Filed: Oct. 8, 1970 [2]] Appl. No.: 79,167

[52] US. Cl ..24/73 I'll-I, 24/73 BB, 2/323,

- 24/198 [51 Int. Cl ..A44b 21/00, A44b 1 1/02 [58] Field of Search ..24/73 HH, 73 TH, 73 A, 73 BB,

24/73 BH, 73 SF, 73 LA, 73 MC, 73 GS, 86 A, 84 A, 198, 81 A, 81 AG, 74; 268/361 A; 297/389; 2/304, 323, 325, 321, 322; 224/421 B, 42.39, 42.4

[56] References Cited UNITED STATES PATENTS 3,267,490 8/1966 Wallace, ...2/323 7 2,948,037 8/1960 Bugyi ..24/73 LA 3,222,688 12/1965 Rosenzweig ..2/323 FOREIGN PATENTS OR APPLICATIONS 818 1/1904 Great Britain ..24/73 A Primary Examiner-Bemard A. Gelak Attorney-Richard L. Ward [57] ABSTRACT An adjustable strap assembly is connectable between two variably spaced points to provide a holding tension therebetween. The strap assembly includes two buckles and an elongated belt connected to the buckles to provide three strands between the buckles. The relative spacing between the buckles is selectively adjustable to alter the effective length of the strap assembly.

7 Claims, 4 Drawing Figures PATENTEnJuuzv'mzz IN VENTOR.

AGENT ADJUSTABLE STRAP BACKGROUND OF THE INVENTION 1. Field of the Invention This invention is related to holding straps and more particularly to an adjustable holding strap for applying holding tension between two variably spaced points.

2. Description of the Prior Art There are many uses for a holding strap including holding an automobile trunk lid down on a load which prevents complete closing; holding a variable-sized load on a car top carrier; and holding a tarpaulin on a truck load, to name a few. The most commonly used holding strap includes a length of molded rubber or elastomer having a hook at each end. The stretch of the rubber accommodates some variation in the spacing between connection points but a selection of sizes is essential to properly and easily connect between the points when the variations in spacing are greater than minimal. This requirement for a plurality of straps is both costly and inconvenient.

SUMMARY OF THE INVENTION It is therefore an object of this invention to provide an improved adjustable strap.

It is a further object of this invention to provide an improved holding strap adjustable over a wide range of lengths.

It is a still further object of the instant invention to provide an improved adjustable holding strap having a unitary strip of material forming a plurality of selectively variable lengths of strap between a pair of buckles.

The instant invention achieves these objects in a holding strap having a pair of buckles interconnected with an elongated belt and forming a plurality of strands extending between' the buckles wherein the buckles are selectively movable on the belt to alter the relative spacing of the buckles and effectively vary the useful length of the strap.

Operation of the device and further objects and advantages thereof will become evident as the description proceeds and from an examination of the accompanying sheet of drawings.

BRIEF DESCRIPTION OF TI-IE DRAWINGS The drawings illustrate a preferred embodiment of the invention with similar numerals referring to similar parts throughout the several views wherein,

FIG. 1 shows a face view of the adjustable strap of the instant invention;

FIG. 2 shows a side view of the adjustable strap of FIG. 1;

FIG. 3 shows an enlarged fragmentary sectional view of one of the buckles included in the adjustable strap of FIGS. 1 and 2; and

FIG. 4 is an enlarged fragmentary view similar to FIG. 3 and showing a modified buckle for an adjustable strap.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIGS. 1 and 2 there is shown an adjustable holding strap assembly comprising an elongated belt member 11, a pair of hooks l2 and 112 connected at the ends of the belt member 11 and a pair of buckles l3 and 113 on the belt member between the end hooks 12 and 112. In this specification, end hooks l2 and 112 are similar, as are buckles l3 and 113. Separate numerals are assigned for these parts, and other parts also, for purposes of clarity of explanation in the specification.

The belt member 11 is in the form of an elongated unitary strip of polyurethane elastomer. The cross section of the belt 11 is generally rectangular with a relatively wide base, as viewed in FIG. 1, so that it may be considered a thin flat belt though other shapes could be used in an adjustable strap embodying the instant invention. Other belt materials, such as leather or a woven strip, could also be used in this novel adjustable strap.

As best shown in FIG. 2, the ends 15 and of the polyurethane belt 11 are folded over and joined at the contacting surfaces by heat or solvent welding to form loops l6 and 116 substantially at the ends of the belt 11 for fixing the hooks l2 and 112 to the belt.

The hook 12, for example, is formed in the embodiment shown from a strip of metal rod, heavy wire, or light bar stock to include a generally oval portion 19, as in FIG. 1, for receiving the belt loop 16 and an open hook portion 20, as in FIG. 2, for detachably fastening the strap assembly between spaced connection points.

Referring primarily to the enlarged FIG. 3 and also to the overall views of FIGS. 1 and 2, the buckle 13 is shown as a relatively thin fiat plate having three

slots

23, 24, and 25 formed therein to receive the belt 11 and defining four cross arms or bars 28-31 engageable with the belt 11 and joined at the ends by side bars 33. The comers of the cross arms, such as at 34 in FIG. 3, engageable with the belt are beveled, formed with a radius, or otherwise formed without sharp edges to avoid cutting of the belt 11.

The belt 11 is uniquely threaded into particular slots of the pair of

buckles

13 and 113 to provide three strands of belt, such as 36, 37, and 38, between the spaced-

apart buckles

13 and 113 while keeping the ends free for connection to spacedapart points.

The overall threading of the belt 1 1 into the

buckles

13 and 113 to provide three belt strands 36-38 therebetween is shown in the side view of FIG. 2, but reference to the enlarged view of FIG. 3 is helpful in considering the specific threading of each buckle of this embodiment. As shown in FIG. 3, the belt 11 enters a first slot 23, nearest the end of the belt, from one side of the buckle l3, and reverses and enters the second slot 24 from the other side of the buckle l3 and then extends toward the second buckle 113 so that one side 39 of the belt 11 is in frictional engagement with the first and

third cross bars

28 and 30 while the other side 40 of the belt 11 is in frictional engagement with the second cross bar 29. This threading of the belt 11 effectively forms a loop around cross arm 29 and locks the belt portion to one buckle 13 in a substantially no-slip frictional engagement, especially when a tension load is applied to the strap assembly.

Referring to FIG. 2, the belt extends from the first buckle 13 to and is threaded through one slop of the second buckle 113 then reverses direction to form a loop 41 engageable with a cross bar 131 of the second buckle 113. The belt then extends back to and is threaded into a slot 25 of buckle l3 and reverses direction to form a loop 42 engageable with the fourth cross bar 31 of the first buckle 13. The belt extends toward buckle 113 and a second portion of the belt is finally engageable with the second buckle 113 in a substantially noslip manner as previously described for the first buckle 13. There is thus formed a strap assembly having three strands of belt 36-38 extending between a pair of

buckles

13 and 113 wherein the buckles are selectively movable along the belt 11 to vary the length of the strands 36-38 between the

buckles

13 and 113. Generally, for each inch increase in spacing between the

buckles

13 and 113 there is a two inch net decrease in overall length of the strap assembly.

The adjustable limits of the strap assembly are determined by the initial length of the belt member 11. FIGS. 1 and 2 show the strap assembly in approximately the shortest possible overall length since the

buckles

13 and 113 are adjacent the

end hooks

12 and 112. To adjust the length, at least one of the buckles may be moved so that the buckles l3 and 113 are increasingly closer together to achieve longer effective length of the strap assembly.

When the strap assembly is put under a tension load it will assume substantially the configuration shown in FIG. 2. When an increasingly heavy tension is placed on a strap assembly having a polyurethane belt there may be some stretch of the belt 11 along its length and some depression or indentation of the belt surface at the buckle cross bars. This indentation will provide additional resistance to slippage of the belt relative to the buckle.

To adjust the length of the strap, the belt may be loosened from the second cross bar 29 so that the buckle 13 may be moved relative to the belt 11. The strands 36-38 between the buckles may then be adjusted so that they are approximately equal. The strap assembly is then ready to connect between spaced points.

Referring to FIG. 4, the use of a simplified buckle 45 is shown. The buckle 45 includes three cross bars 46-48 so the locking of the belt 11 to the buckle is achieved by engagement of the belt with the first and

second cross arms

46 and 47, as with buckle 13 of FIG. 3, and with the surface of the belt at the belt loop 49 extending around the other cross bar 48. This buckle 45 is operable in an adjustable strap assembly where the size and frictional characteristics of the belt achieves substantially no-slip engagement relative to the buckles.

It is clear that the adjustable strap assembly described hereinabove provides an improved, low cost, versatile holding or clamping strap. Each adjustable strap is useful over a wide range of lengths. Furthermore, belt characteristics may be selected to fit the required operating conditions. The adjustable strap is thus useful for holding automobile trunk lids, truck tarpaulins, and various loads in or on automobiles, trucks, other vehicles, pallets, or containers.

In the foregoing drawings and specification, there has been set forth a preferred embodiment of the invention and although specific terms are employed, these are used in a generic and descriptive sense only and not for purposes of limitation. Changes in form and the proportion of parts as well as the substitution of equivalents are contemplated as circumstances may suggest or render expedient without departing from the spirit or scope of this invention.

1 claim:

I. An adjustable strap connectable between spaced points, comprising: an elongated elastomeric belt means, means located effectively at the ends of said belt means for connecting said belt means to said spaced points, first and second buckles including transverse cross bars defining first, second, and third slots to receive said belt means for engagement of said cross bars with first and second spaced-apart portions of said belt means in a substantially no-slip condition that includes said belt means passing through said first slot and back through said second slot at each of said buckles, the intermediate portion of said belt means between said first and second portions passing alternately through the third slot of first one buckle and then the other buckle to form a plurality of strands of belt means extending between the first and second buckles whereby each of said slots receives a single strand of said belt means, said first and second portions of the belt means being selectively movable relative to said first and second buckles to vary relative spacing of said buckles whereby the effective overall length of said adjustable strap is varied.

2. An adjustable strap as defined in claim 1 wherein said belt means has a generally rectangular cross section and wherein the base dimension engageable with said cross bars greatly exceeds the thickness dimension.

3. An adjustable strap as defined in claim 1 wherein said connecting means is in the form of hooks fixed to the ends of said belt means.

4. An adjustable strap as defined in claim 1 wherein said belt means is in the form of a unitary strip of polyurethane material.

5. An adjustable strap connectable between first and second spaced points, the combination comprising: an elongated flat elastomeric belt member, means at the ends of the belt member for connecting said belt member to said first and second spaced points, first and second spaced-apart buckles each having transverse cross bars engageable with said belt member and defining first, second and third slots, said belt member passing through the first slot from a first side of said first buckle and back through the second slot of said first buckle from the second side thereof, said belt member extending to said second buckle and passing through the third slot from said first side and returnin to said first buckle to pass through said third slot from sai first side, said belt member continuing to said second buckle to pass through said second slot from said second side and back through the first slot of said second buckle from said first side whereby each of the first, second and third slots of both buckles receives a single strand of said belt member in a substantially no-slip engagement with said buckles, said belt member being selectively movable relative to said buckles to vary the relative portion of said belt member between said buckles whereby the effective overall length of said strap is adjustable.

6. An adjustable strap as defined in claim 5 wherein said flat belt member is in the form of a unitary strip of polyurethane material and wherein said adjustable strap is resiliently connectable between said spaced attachment points to maintain said adjustable strap under tension.

7. An adjustable strap as defined in claim 5 wherein said fiat belt member is in the form of a unitary strip of polyurethane material and wherein said connecting means includes hooks retained in loops of polyurethane material at the ends of the belt member.

Claims

1. An adjustable strap connectable between spaced points, comprising: an elongated elastomeric belt means, means located effectively at the ends of said belt means for connecting said belt means to said spaced points, first and second buckles including transverse cross bars defining first, second, and third slots to receive said belt means for engagement of said cross bars with first and second spaced-apart portions of said belt means in a substantially no-slip condition that includes said belt means passing through said first slot and back through said second slot at each of said buckles, the intermediate portion of said belt means between said first and second portions passing alternately through the third slot of first one buckle and then the other buckle to form a plurality of strands of belt means extending between the first and second buckles whereby each of said slots receives a single strand of said belt means, said first and second portions of the belt means being selectively movable relative to said first and second buckles to vary relative spacing of said buckles whereby the effective overall length of said adjustable strap is varied.

5. An adjustable strap connectable between first and second spaced points, the combination comprising: an elongated flat elastomeric belt member, means at the ends of the belt member for connecting said belt member to said first and second spaced points, first and second spaced-apart buckles each having transverse cross bars engageable with said belt member and defining first, second and third slots, said belt member passing through the first slot from a first side of said first buckle and back through the second slot of said first buckle from the second side thereof, said belt member extending to said second buckle and passing through the third slot from said first side and returning to said first buckle to pass through said third slot from said first side, said belt member continuing to said second buckle to pass through said second slot from said second side and back through the first slot of said second buckle from said first side whereby each of the first, second and third slots of both buckles receives a single strand of said belt member in a substantially no-slip engagement with said buckles, said belt member being selectively movable relative to said buckles to vary the relative portion of said belt member between said buckles whereby the effective overall length of said strap is adjustable.

7. An adjustable strap as defined in claim 5 wherein said flat belt member is in the form of a unitary strip of polyurethane material and wherein said connecting means includes hooks retained in loops of polyurethane material at the ends of the belt member.