Strap for securing accessories to photographic flash units

A strap for fastening an accessory to a photographic flash unit may have a stretchable substrate; an outer fastener strip attached to the stretchable substrate, the outer fastener strip having one of hook fastener material and loop fastener material; and an inner fastener strip attached to the stretchable substrate, the inner fastener strip having the other of hook fastener material and loop fastener material; wherein the outer fastener strip has at least one slack region having an amount of slack when the stretchable substrate is in an undeflected condition.

FIELD

This application relates generally to the field of photography, and more specifically to a strap for securing accessories to photographic flash units.

BACKGROUND

In the field of photography, photographers frequently need to secure various accessories to photographic flash units, such as electronic flash units, in order to achieve a desired lighting arrangement. Electronic flash units typically have a fairly smooth plastic outer surface. In the past, photographers have often secured various attachments to electronic flash units with adhesive-backed hook and loop fasteners, such as Velcro™ fasteners, in order to direct or condition the light emanating from the electronic flash units in a desired manner. However, as the prices of electronic flash units have increased substantially over the past few years, photographers have become increasingly reluctant to affix adhesive-backed hook and loop fasteners to their expensive electronic flash units. Thus, there is a need for an improved method and apparatus for securing accessories to photographic flash units.

SUMMARY

A strap for fastening an accessory to a photographic flash unit may have a stretchable substrate; an outer fastener strip attached to the stretchable substrate, the outer fastener strip having one of hook fastener material and loop fastener material; and an inner fastener strip attached to the stretchable substrate, the inner fastener strip having the other of hook fastener material and loop fastener material; wherein the outer fastener strip has at least one slack region having an amount of slack when the stretchable substrate is in an undeflected condition.

DETAILED DESCRIPTION

As used herein, the following terms should be understood to have the indicated meanings:

When an item is introduced by “a” or “an,” it should be understood to mean one or more of that item.

“Attached” means, with respect to two or more objects, fastened together by any suitable fastener, including but not limited to one or more stitches, staples, brads, rivets, nails, screws, tacks, glue, adhesive, epoxy, welds, or a combination thereof.

“Comprises” means includes but is not limited to.

“Comprising” means including but not limited to.

“Fastener strip” means a strip of material comprising at least one of hook or loop fastener material. A fastener strip may have both hook fastener material and loop fastener material.

“Having” means including but not limited to.

“Hook-and-loop fastener material” means any multi-layer fastener material having a “hook” component and a “loop” component wherein the “hook” component is removably securable to the “loop” component. Hook-and-loop fastener material may include but is not limited to Velcro™ brand hook-and-loop fastener material.

“Non-skid surface” means a surface that has a substantial coefficient of friction with respect to a generally smooth surface.

“Stretchable substrate” means a strip of material that has a capacity for stretching upon application of a tensile force to the strip.

As shown inFIGS. 1-8, a strap10for securing an accessory to a photographic flash unit may have a stretchable substrate12to which an outer fastener strip14and an inner fastener strip16are attached by any suitable attachment, such as one or more stitched seams20,22, for example. As shown inFIGS. 1-5and8, outer fastener strip14may be intermittently attached to stretchable substrate12at connection points such as seams20along a first side of stretchable substrate12. In some embodiments, one or more of the seams20may include a button hole stitch. Stretchable substrate12may be made of any suitable material having a non-skid surface and a capacity for stretching upon application of a tensile force, such as SN12000D Slip-Not™material available from Eastex Products, Inc., Holbrook, Mass., or Free-Band198material available from Kent Elastomer Products, Inc., Kent, Ohio, for example. Stretchable substrate12may have a knit, woven, or other suitable fabric backing, which may enhance the capacity of stretchable substrate12to be sewn, and a “grippy” non-skid surface, such as a rubber or suitable polymer, for example, which may have a plurality of raised dots or other surface features to increase its coefficient of friction and enhance its ability to grab a smooth surface such as ABS plastic. In some embodiments, outer fastener strip14may have loop fastener material, and inner fastener strip16may have hook fastener material. Alternatively, outer fastener strip14may have hook fastener material, and inner fastener strip16may have loop fastener material. In some embodiments, each of outer fastener strip14and inner fastener strip16may have both hook fastener material and loop fastener material. Although outer fastener strip14is shown as extending substantially the entire length of strap10, outer fastener strip14may have a length that is less than the entire length of strap10.

Outer fastener strip14may be configured such that when stretchable substrate12is in an undeflected condition as shown inFIGS. 1-8, outer fastener strip14may have one or more slack regions18between seams. Slack regions18are not attached to stretchable substrate12except at the seams20that bound the slack regions18, and such seams20may be oriented transverse to the length of the stretchable substrate12so as not to interfere significantly with its ability to stretch. Although four slack regions18are shown in the illustrated embodiments, fewer than four or more than four slack regions18may be employed, depending on the particular application. The one or more slack regions18give strap10an ability to stretch until outer fastener strip14is fully extended and all or substantially all the slack has been eliminated from strap10as shown inFIGS. 9 and 10. When strap10is stretched, it may be wrapped about a photographic flash unit30as shown inFIG. 11such that all or a portion of inner fastener strip16is removably secured to outer fastener strip14by the interaction of overlapping hook fastener material and loop fastener material, one of which is on inner fastener strip16and the other of which is on outer fastener strip14. In this manner, strap10may be wrapped about photographic flash unit30such that strap10is in a desired state of tension and the non-skid surface of stretchable substrate12is in contact with the exterior surface of the photographic flash unit, which holds strap10securely in place on photographic flash unit30. The non-skid surface of stretchable substrate12may engage all or a portion of the perimeter of photographic flash unit30. An accessory40having one or more complementary hook or loop fastener material regions such as on tabs42may then be secured to strap10as shown inFIG. 12. Examples of accessories with hook or loop fastener material that may be attached to strap10include but are not limited to those shown in U.S. Pat. No. Des. 342,273 and U.S. Pat. No. Des. 312,471, each of which is incorporated herein by reference.

Strap10and its components may be sized in order to fit any desirable photographic flash unit. One embodiment of strap10that will accommodate a fairly wide variety of photographic flash units may have an undeflected length Loof about 9.75 inches and a fully stretched length Lfof about 11.0 inches. In this embodiment, stretchable substrate12may be a strip of SN12000D Slip-Not™ material having a width W of about 1.0 inch and an undeflected length D of about 7.25 inches, outer fastener strip14may be a strip of Velcro™ brand loop fastener material having a width of about 1.0 inch and a length of about 11.0 inches, and inner fastener strip16may be a strip of Velcro™ brand hook fastener material having a width of about 1.0 inch and a length of about 2.5 inches. In this embodiment, each of the slack regions18may have a length S of about 1.38 inches in the undeflected condition. Alternatively, the slack regions18may not all have the same size. When fully stretched or deflected, this embodiment of strap10will have about 3.0 lbs. of tension and will fit many commercially available photographic flash units, such as those available from Nikon™, Canon™, Olympus™, Pentax™, Leica™, Comtax™, Sony™, Minolta™, Sunpak™, Vivitar™, Metz™, Sigma™, and Lumopro™, for example. One exemplary photographic flash unit30for which such an embodiment of strap10is suitable for use is the SD-900 AF Speedlight™ available from Nikon Inc., Melville, N.Y., which has a perimeter of about 9.5 inches. Of course, strap10and its components may be configured to provide any desired amount of tension when stretched to a desired length according to the equation F=k*x, where F is the tension force, k is the spring constant for the material of stretchable substrate12, and x is the change in length (i.e., the amount of stretch) of stretchable substrate12.

In some embodiments, as shown most clearly inFIG. 3, a plurality of spaced apart seams20may be provided on an end of strap10opposite inner fastener strip16to allow the user to trim down the strap10for a better fit on smaller photographic flash units. That is, the user may trim strap10just outboard of one of the seams20by cutting off the undesired portion of strap10with scissors, a knife, or other suitable trimming tool in order to shorten the overall length of strap10to fit a smaller photographic flash unit. If strap10is trimmed in this manner, the remaining seam(s)20on that end of strap10will keep stretchable substrate12and outer fastener strip14of strap10attached to each other. Although such seams20are shown with approximately equal spacing, the spacing of such seams may or may not be the same.

Although the foregoing specific details describe certain embodiments of this invention, persons reasonably skilled in the art will recognize that various changes may be made in the details of this invention without departing from the spirit and scope of the invention as defined in the appended claims and considering the doctrine of equivalents. Therefore, it should be understood that this invention is not to be limited to the specific details shown and described herein.