US3882914A

US3882914A - Carrying strap construction

Info

Publication number: US3882914A
Application number: US379716A
Authority: US
Inventors: Glenn L Strutz
Original assignee: TOTE PAK Co
Current assignee: TOTE PAK Co
Priority date: 1973-07-16
Filing date: 1973-07-16
Publication date: 1975-05-13
Anticipated expiration: 1992-05-13

Abstract

A carrying strap comprises a resilient foam padding layer sandwiched between inner and outer surface strips of soft pliable simulated leather material, with an inner load-bearing layer of tightly woven high-strength webbing extending across the full width of the strap between the foam padding and the outer surface layer. Side edge caps enclose the side edge portions of the surface layers and webbing, and side stitching secures the caps, surface layers and webbing together throughout the length of the strap. The opposite ends of the strap are attached to a carrying bag by a pair of side-by-side rivets extending through the surface layers and webbing of the strap, through the bag material and through a leather backing patch on the inside surface of the bag material. Cross-stitching through the strap ends, bag and backing patch below the rivets prevents the strap from twisting on the rivets.

Description

United States Patent 1 Strutz 51 May 13, 1975 CARRYING STRAP CONSTRUCTION [75] Inventor: Glenn L. Strutz, Madras, Oreg. [73] Assignee: Tote Pak Co., Madras, Oreg.

[22] Filed: July 16, 1973 [21] Appl. No.: 379,716

[52] US. Cl ISO/1.5 R; 224/5 P [51] Int. Cl A63b 55/00 [58] Field of Search 224/1 1, 2.2, 5.4, 5.15,

224/5.16, 5.17, 5.22, 5.24, 5.26, 5.18, 47, 45.8, 49, 58,1 A, 5 P, 2 B, 59; ISO/1.5 B;

[56] References Cited UNITED STATES PATENTS 1,203,095 10/1916 Bristow ISO/1.5 R 1,403,167 l/1922 Kahlow... 190/57 1,696,509 12/1928 Tresner 224/5 Q 2,008,759 7/1935 Howard ISO/1.5 R 2,505,272 4/1950 Blalook et al. 224/5 P 2,598,143 5/1952 Smith 224/1 A 2,609,898 9/1952 Finkelstein 190/58 R 2,676,737 4/1954 Zirbel 224/5 P 2,808,973 10/1957 Gobble 224/5 P 2,820,498 1/1958 Ender ISO/1.5 R 3,642,183 2/1972 Boren 224/2 B FOREIGN PATENTS OR APPLICATIONS 527,910 10/1940 United Kingdom 224/5 P 521,222 5/1940 United Kingdom 224/5 P Primary Examiner-Robert J. Spar Assistant Examiner-Kenneth Noland Attorney, Agent, or F irm-Klarquist, Sparkman, Campbell, Leigh, Hall & Whinston [57] ABSTRACT A carrying strap comprises a resilient foam padding layer sandwiched between inner and outer surface strips of soft pliable simulated leather material, with an inner load-bearing layer of tightly woven highstrength webbing extending across the full width of the strap between the foam padding and the outer surface layer. Side edge caps enclose the side edge portions of the surface layers and webbing, and side stitching secures the caps, surface layers and webbing together throughout the length of the strap. The opposite ends of the strap are attached to a carrying bag by a pair of side-by-side rivets extending through the surface layers and webbing of the strap, through the bag material and through a leather backing patch on the inside surface of the bag material. Cross-stitching through the strap ends, bag and backing patch below the rivets prevents the strap from twisting on the rivets.

6 Claims, 7 Drawing Figures PATENTED MAY 1 31975 FIG. 2

CARRYING STRAP CONSTRUCTION BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carrying strap construction and means for attaching the carrying strap to a carrying bag.

2. Description of the Prior Art In the typical carrying strap for, for example, a golf bag or backpack, a narrow strap of leather or canvas is used as the primary load-bearing member, with a wider and thicker layer of form or other suitable padding placed between the strap and the wearers shoulder. The narrow strap, when loaded, bites into the padding, forcing the padding against the wearers shoulder only across a narrow band corresponding to the width of the strap, thereby concentrating the load in a small area of the shoulder, which tends to lead to early fatigue and soreness. Accordingly there is a need for a carrying strap which distributes and transmits the supported load across the full padded width of the strap.

Synthetic materials which simulate leather, such as vinyl, are being used increasingly as substitutes for leather in golf bags, backpacks and other carrying bags because of the expense of leather and its tendency to deteriorate rapidly in the absence of proper care. However, most vinyl materials have less tear strength than leather and thus there have been problems in the past in using vinyl and similar synthetics at stress-bearing seams and joints in carrying straps and bags. Accordingly there is a need for an improved means of attaching an essentially vinyl carrying strap to a carrying bag of vinyl material in a manner that will resist tearing and failure of the joint.

SUMMARY OF THE INVENTION The present invention is a padded carrying strap construction designed to distribute the supported load across the full padded width of the strap to minimize the concentration of stress on the wearers shoulders.

The carrying strap construction of the invention is prrticularly suited for manufacture with and attachment to vinyl materials in that the construction minimizes tearing strains on the strap and at the points of attachment of the strap to a carrying bag.

An important feature of the strap construction is a wide and thick inner layer of foam padding sandwiched between thin, soft and pliable surface layers, and with a thin but strong and relatively non-stretchable loadbearing member extending the full width of the padding between the padding and one of the surface layers.

Another feature of the carrying strap construction is the means by which the strap is attached to a carrying bag using a combination of side-by-side rivets, crossstitching and a high-strength backing patch on the inside surface of the bag material.

In summary, primary objects of the invention include provision of:

a carrying strap construction particularly suited for use with vinyl materials;

a strap construction that distributes the load evenly across the full padded width of the strap to minimize fatigue;

a strap construction that has a wide variety of loadbearing applications in conjunction with golf bags, car

rying bags and numerous other load-lifting applications;

a strap construction that maintains the desired shape of the strap;

a strap construction that will not stretch;

a strap construction that is simple and economical to manufacture;

a strap construction that is comfortable to the wearer; and

a means of attaching the carrying strap to a carrying bag in a manner that resists separation of the strap from the bag and tearing of the strap or bag at their interconnection.

The foregoing and other objects, features and advantages of the present invention will become more apparent from the following detailed description which proceeds with reference to the accompanying drawings showing one form of the strap.

BRIEF DESCRIPTION OF THE DRAWINGS In the drawings:

FIG. 1 is an elevational view of a golf bag having a strap of the present invention attached to it;

FIG. 2 is a foreshortened plan view of the strap of FIG. 1;

FIG. 3 is an enlarged sectional view through the lower strap connection to the bag taken along the line 3--3 of FIG. 2;

DETAILED DESCRIPTION With reference to the drawings, FIG. 1 shows a golf bag 10 made of a vinyl material and having a carrying strap 12 made in accordance with the invention attached to it. The strap is attached at a first attaching point 13 near the top of the bag and at a second attachment point 14 at an intermediate position along the length of the bag.

The outer face of the strap is shown in FIG. 2, revealing its overall shape. The strap includes a relatively wide padded load-bearing portion 12a extending throughout a major intermediate portion of its length with such portion tapering inwardly to narrow upper and lower

unpadded end portions

12b, 12c, respectively. The end portions are attached to the bag material 10 by attaching means including a pair of rivets 16. Such attaching means is shown in greater detail in FIGS. 3, 6 and 7 and will be described in greater detail hereinafter.

Referring to FIG. 4, the padded intermediate portion of the strap includes a relatively wide and thick filler layer or core of a resilient sponge-like foam material 18. This layer is covered on its opposite sides by thin, soft pliable outer and

inner surface strips

20, 22 of a leather-like material such as vinyl or cloth-backed vinyl. A wide strip 24 of high-strength, tightly woven canvas webbing or the equivalent lies between the foam filler l8 and the outer surface layer 20. This webbing extends substantially flat throughout the full width of the strap. The primary function of the webbing is to carry and distribute the loads transmitted to the strap and to maintain its width and length dimensions. Thus this load-bearing inner layer should be made of highstrength material that resists stretching. The tightly woven canvas webbing commonly used in upholstered furniture construction is ideal for this purpose.

The opposite side edge portions of the surface layers and inner webbing layer extend beyond the opposite sides of the foam padding layer 18. These side edge portions are stitched together by edge stitching 26, 28 which extends throughout the full length of the strap. The opposite side edge portions of the surface layers and inner webbing layer are covered by

edge caps

30, 31, preferably of the same material as the outer surface layers. These caps are attached to the edge portions of the surface and webbing layers by the aforementioned edge stitching. The stitching not only fastens the surface layers together to define an enclosure within which the foam padding 18 is received and retained, but also serves to maintain the inner webbing layer 24 in a substantially flat condition to prevent its bunching and buckling in use. Thus the stitching ensures that any load transmitted to the strap will be distributed across substantially the full width of the webbing, and from the webbing through the full width of the padding in a wide band to the wearers shoulders to minimize the unit loading on the shoulders.

FIGS. 3 and 5 show the lower unpadded end portion 12c of the strap, which is identical in construction to the upper end portion 12b. Such portions eliminate the foam padding 18, although this is not essential, and instead include only the thin, high-strength, inner webbing layer 24 between the outer and

inner surface layers

20, 22. As in the padded intermediate portion of the strap, the webbing layer extends the full width of the surface layers in these end portions. The

end caps

30, 31 continue throughout the end portions of the strap, as does the previously mentioned

stitching

26, 28, securing the end caps, surface layers and webbing layer together.

The means for attaching the end portions of the strap to the vinyl bag will now be described in detail with reference to FIGS. 3, 6 and 7. The pair of side-by-side rivets l6 penetrate the two surface layers and inner webbing layer of the strap as well as the vinyl material 10 of the bag. The rivets also penetrate a leather backing patch member 34 before being clinched at 16a against the outer surface of the patch to compress together the strap layers, bag material and patch. From FIG. 6 it will be noted that the rivets actually extend through the edge caps 30, 31 of the strap, thereby pro viding further reinforcement of the strap against any tendency of the rivets to tear the vinyl strap material. Below the rivets 16, that is, in a direction toward the terminal end of the strap, the two surface layers and webbing layer of the strap are cross-stitched to the bag by double stitching 36. Such stitching extends across the width of the strap and through both the bag layer 10 and the backing patch 34.

The purpose of the backing patch is, of course, to prevent the rivets from pulling through the vinyl bag material. To best fulfill this function, the patch should be securely bonded with a suitable adhesive to the inside of the bag. Thus the patch becomes an integral part of the bag and distributes rivet-induced stress to a wide area of the bag to minimize unit stresses on the bag material. Because of the placement of the rivets relative to the cross-stitching 36, the rivets bear the entire load at the strap connections to the bag. The purpose of the stitching is to prevent the strap from twisting about the rivets and producing any sort of a tearing or shearing action. Thus the leather backing patch permits the strap to twist, pull and turn without cutting or tearing the vinyl bag material.

In testing the above-described attaching means, it has been found that backing patch materials other than leather, such as plastics, canvas and even metals, do not provide the stability and resistance against pull-out under heavy or sudden loading that leather provides. Furthermore it has been found that a monolithic full thickness of leather is preferred to split leather for the backing patch material in carrying out the purposes of the patch.

As previously suggested, materials other than vinyl can be used for the surface layers 20, 22 of the strap construction so long as such materials have the desirable soft pliable characteristics of vinyl. Similarly, any resilient soft padding material can be used in place of the preferred plastic sponge-like foam if desired. The webbing used is a high-strength material that is resistant to any substantial stretching and is the primary loadbearing and shape-maintaining component of the strap. Any substitute material should have similar characteristics.

The strap can be manufactured in any width and length for a wide variety of uses and for supporting widely varying load capacities, wherever it is important to provide a protective padding for the load. Possible applications other than for golf bags, tote bags and backpacks would include lifting slings for lifting race horses when they are crippled or for lifting heavy commercial and industrial loads such as furniture where it is important not to mar the load.

Having illustrated and described a preferred embodiment of the invention, it should be apparent to those skilled in the art that the same permits of modification in arrangement and detail. I claim as my invention all such modifications as come within the true spirit and scope of the following claims.

I claim:

1. A carrying strap construction comprising:

a first thin, soft, pliable strip forming a first surface layer of said strap;

a second thin, soft, pliable strip overlying said first strip and forming a second surface layer of said strap;

a resilient layer of padding material of greater thickness than said surface layers sandwiched between said surface layers;

a thin, flexible strip of high-strength material resistant to stretching forming an inner load-bearing layer of said strap between said resilient layer and one of said surface layers and extending across the full width of said padding layer;

and stitching extending through said first and second surface layers and said load-bearing inner layer at the opposite side edge portions of said strap and along the length thereof to stitch together said surface and inner layers and enclose said layer of padding;

at least one end portion of said strap being fastened to a carrying bag by attachment means comprising at least two side-by-side rivets extending through both said surface layers and said load-bearing inner layer and through the material of said bag and through a backing patch member on an inside surface portion of said bag material with said rivets compressing the aforesaid layers of strap and bag between the opposite enlarged ends thereof;

and cross-stitching extending across the width of said strap and through said surface and inner layers of said strap and through said bag material and said backing patch at a position on said strap spaced toward the end of said strap from said rivets.

2. A construction according to claim 1 wherein both said surface layers and said bag material comprise a vinyl material and wherein edge caps of vinyl material enclose opposite side edge portions of said strap in overlying relationship to said surface layers throughout the length of said strap, said stitching extending through said edge caps, surface layers and inner layer of said strap throughout the length thereof to fasten said strap surface layers and caps together and cause said high-strength inner layer to extend substantially flat across the full width of said strap, said rivets extending through said edge caps.

3. A construction according to claim 1 wherein said backing patch member comprises a monolithic full thickness of leather.

4. A construction according to claim 1 wherein said backing patch member is bonded to said inside surface portion of said bag material.

5. A carrying strap construction comprising:

a first thin, soft, pliable strip forming a first surface layer of said strap;

a thin, flexible strip of high-strength material resistant to stretching forming an inner load-bearing layer of said strap between said first and second surface layers;

at least one end portion of said strap including said first and second surface layers and said inner layer being fastened to a carrying bag by attachment means comprising at least two side-by-side rivets, extending through said surface layers and said load-bearing inner layer and through the material of said bag and through a backing patch member on an inside surface portion of said bag material with said rivets compressing the aforesaid layers of said strap and bag between the opposite enlarged ends of said rivets;

and cross-stitching extending across the width of said strap end portion and through said surface and inner layers of said strap and through said bag material and said backing member at a position on said strap spaced toward the end of said strap from said rivets.

6. A strap construction according to claim 5 wherein said first and second surface layers of said strap are composed of vinyl material and said backing patch member is composed of leather.

Claims

1. A carrying strap construction comprising: a first thin, soft, pliable strip forming a first surface layer of said strap; a second thin, soft, pliable strip overlying said first strip and forming a second surface layer of said strap; a resilient layer of padding material of greater thickness than said surface layers sandwiched between said surface layers; a thin, flexible strip of high-strength material resistant to stretching forming an inner load-bearing layer of said strap between said resilient layer and one of said surface layers and extending across the full width of said padding layer; and stitching extending through said first and second surface layers and said load-bearing inner layer at the opposite side edge portions of said strap and along the length thereof to stitch together said surface and inner layers and enclose said layer of padding; at least one end portion of said strap being fastened to a carrying bag by attachment means comprising at least two side-by-side rivets extending through both said surface layers and said load-bearing inner layer and through the material of said bag and through a backing patch member on an inside surface portion of said bag material with said rivets compressing the aforesaid layers of strap and bag between the opposite enlarged ends thereof; and cross-stitching extending across the width of said strap and through said surface and inner layers of said strap and through said bag material and said backing patch at a position on said strap spaced toward the end of said strap from said rivets.

5. A carrying strap construction comprising: a first thin, soft, pliable strip forming a first surface layer of said strap; a second thin, soft, pliable strip overlying said first strip and forming a second surface layer of said strap; a thin, flexible strip of high-strength material resistant to stretching forming an inner load-bearing layer of said strap between said first and second surface layers; at least one end portion of said strap including said first and second surface layers and said inner layer being fastened to a carrying bag by attachment means comprising at least two sideby-side rivets, extending through said surface layers and said load-bearing inner layer and through the material of said bag and through a backing patch member on an inside surface portion of said bag material with said rivets compressing the aforesaid layers of said strap and bag between the opposite enlarged ends of said rivets; and cross-stitching extending across the width of said strap end portion and through said surface and inner layers of said strap and through said bag material and said backing member at a position on said strap spaced toward the end of said strap from said rivets.