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Title: Heavy duty staple
Claims: I claim as my invention: 1. A staple having a head end and elongated spaced substantially coextensive prongs with pointed tips, the prongs being of generally square cross section each provided with four longitudinal corners: a plurality of the corners on each of the prongs having respective series of longitudinally spaced interlock notches; each of said notches being defined by a shoulder facing generally toward the head end of the staple and a surface slanting from the inner end of the shoulder and running out at the associated prong corner, the shoulders on said four corners being arranged so as to be in sets with each set disposed in a common plane extended transversely of a longitudinal axis through the associated prong and with the sets being arranged in a series of generally parallel planes extending along the length of the prong enabling each set of shoulders to be simultaneously embedded when the staple is driven into an object and with the shoulders and the associated notches in each set being spaced from one another about a central axis of the associated prong; said notches being coined, and with material displaced from the notches providing lateral shoulder bulges on the faces of the prongs alongside the notches thus increasing the effective areas of the shoulders. 2. A staple according to claim 1, in which material displaced from the notches provides shoulder bulges along the sides of the slanting surfaces facing generally toward the head end of the staple to serve supplemental to the notch shoulders for interlocking with wood into which the staple may be driven. 3. A staple according to claim 1, in which said slanting surfaces are both transversely and longitudinally convex and the convergence of said slanting surfaces and said shoulders is on a convex line from side to side of the notches. 4. A staple according to claim 1, wherein said shoulders slope toward the distal ends of the prongs. 5. A staple according to claim 1, wherein said corners are narrowly chamfered, and residual portions of the corners between longitudinally adjacent ones of the notches provide blunt tips at outer barb ends of the shoulders. 6. A staple according to claim 1, wherein said notches are provided in all four corners of each of the prongs in a plurality of transversely aligned tiers and with substantial longitudinal areas of all of the faces of each of the prongs intervening between the notches in the tiers. 7. A staple according to claim 1, wherein the prongs terminate in generally spade-form sharp tips, said tips being subdivided into a plurality of points. 8. A staple according to claim 1, wherein adjacent of the corners are provided with said notches, material displaced from the notches providing shoulder bulges at the faces of the prongs alongside said slanting surfaces and said shoulder bulges converging toward one another and defining interlock pockets for receiving wood expanding thereinto when the staple is driven into a wood member. 9. A staple according to claim 1, having lateral shoulder bulges of material displaced from the notches along sides of said shoulders and slanting surfaces joining at the ends of the juncture of the slanting surfaces and shoulders at each side of each of the notches. 10. A staple according to claim 1, wherein each of the four corners of each of the prongs has said notches coined therein and disposed in tiers in which the side of the notches in the tiers extend short of one another so that there is a substantial unaltered longitudinal area of each face of each of the prongs intervening between the sides of the series of notches, said corners being narrowly chamfered to blunt the edges presented by the corners, residual portions of the corners between longitudinally contiguous notches providing blunt barb tips at the outer ends of said shoulders, the sides of said shoulders converging toward the blunt tips, said slanting surfaces of the notches being convex both transversely and longitudinally, lateral bulges on the prong faces alongside each of said shoulders providing additional effective interlock surface area for each of the shoulders, and lateral bulges on said faces alongside the slanting surfaces providing auxiliary interlock shoulders facing generally toward the head end of the staple, said bulges being of substantially smoothly rounded form at least on their surfaces facing generally toward the distal ends of said prongs. 11. A staple according to claim 10, wherein said auxiliary shoulder bulges alongside the slanting surfaces extend throughout substantial length, and the auxiliary shoulders of contiguous series of the notches at the respective prong faces converge toward one another and define pockets receptive of wood expanding thereinto when the staple is driven into a wooden member. 12. A staple having a head end and elongated spaced substantially coextensive prongs with pointed tips, the prongs being of generally square cross section each provided with four longitudinal corners: a plurality of the corners on each of the prongs having respective series of longitudinally spaced interlock notches; each of said notches being defined by a shoulder facing generally toward the head end of the staple and a surface slanting from the inner end of the shoulder and running out at the associated prong corner, the shoulders on said four corners being arranged so as to be in sets with each set disposed in a common plane extended transversely of a longitudinal axis through the associated prong and with the sets being arranged in a series of generally parallel planes extending along the length of the prong enabling each set of shoulders to be simultaneously embedded when the staple is driven into an object and with the shoulders and the associated notches in each set being spaced from one another about a central axis of the associated prong. 13. A staple according to claim 12, wherein each of said notches being defined by a shoulder facing generally toward the head end of the staple and a surface slanting from the inner end of the shoulder and running out at the associated prong corner; and said slanting surface and said shoulder of each of said notches being substantially triangularly arrow-shaped with their apices at the prong corners, said notches are coined into said corners, and with material displaced from the notches providing lateral shoulder bulges at the sides of said shoulders. 14. A staple according to claim 12, wherein each of said notches including coined shoulders in said corners and with material displaced from the notches providing lateral shoulder bulges along the sides of said slanting surfaces. 15. A staple according to claim 12, wherein said notches are coined in said corners and with material displaced from the notches providing lateral shoulder bulges along the sides of said shoulders, other material displaced from said notches providing lateral shoulder bulges along the sides of said shoulders, and other material displaced from said notches providing shoulders along the sides of said slanting surfaces. Other info: Inventors: Krol, Harry J. (Arlington Heights, IL, US) Application Number: 572207 Filing Date: 1975-04-28 Publication_date: 1976-07-20 Assignee: King-Koral, Inc. (Glenview, IL) Primary Class(es): 411/456 411/457, 411/920 Other Classes: US Patent Ref:
Other Refs: Primary Examiner: Britts, Ramon S. Assistant Examiner: Attorney: Hill, Gross, Simpson, Van Santen, Steadman, Chiara & Simpson |
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