One piece two prong flat head nail type fastener

Claim 2

A fastener of the nail type adapted to be made in one piece from thin metal comprising a polygonal flat head having at least four sides arranged in opposed pairs and at least a first pair of opposed corner portions and at least a second pair of opposed corner portions between adjacent sides. a single pair of prongs integral with and projecting generally perpendicularly from the underside of the head at its medial portion and forming a pair of elongated spaced slots in said head, the elongated spaced slots extending in opposed side-by-side and staggered relationship whereby said slots have relatively adjacent offset inner end portions and relatively remote outer end portions, the prongs being disposed at the adjacent offset inner end portions of said spaced slots in offset relatively adjacent relationship at said medial portion of said head and relatively remote from the corner portions thereof, each of said spaced slots having its longitudinal axis extending at an acute angle to an adjacent side of one of the opposed pairs of sides of said head and its inner end portion spaced from the aforesaid adjacent side at a greater distance than its outer end portion whereby said prongs may be of maximum length without undue weakening of said head, the acute angular relationship of each slot to an adjacent side of said head disposing the transverse axis of each prong in nonparallel nonright-angular relation to any of said sides whereby there is less tendency for said prongs to bend when the fastener is driven from a position in which said head rests on one of its sides nonadjacent said slots and one of said prongs, and each of the second pair of opposed corner portions of said head having a coplanar margin extending at obtuse angles to the contiguous sides of said head.

Claim 3

A fastener of the nail type adapted to be made in one piece from thin metal comprising a polygonal flat head having at least four sides arranged in opposed pairs and at least a first pair of opposed corner portions and at least a second pair of opposed corner portions between adjacent sides, a single pair of prongs integral with and projecting generally perpendicularly from the underside of the head at its medial portion and forming a pair of elongated spaced slots in said head, the elongated spaced slots extending in opposed side-by-side and staggered relationship whereby said slots have relatively adjacent offset inner end portions and relatively remote outer end portions, the prongs being disposed at the adjacent offset inner end portions of said spaced slots in offset relatively adjacent relationship at said medial portion of said head and relatively remote from the corner portions thereof, each of said spaced slots having its longitudinal axis extending at an acute angle to an adjacent side of one of the opposed pairs of sides of said head and its inner end portion spaced from the aforesaid adjacent side at a greater distance than its outer end portion whereby said prongs may be of maximum length without undue weakening of said head, the acute angular relationship of each slot to an adjacent side of said head disposing the transverse axis of each prong in nonparallel nonright-angular relation to any of said sides whereby there is less tendency for said prongs to bend when the fastener is driven from a position in which said head rests on one of its sides nonadjacent said slots and one of said prongs, said head being generally equiangular and generally equilateral and each of the second pair of opposed corner portions of said head being generally angular, and each of said second pair of opposed angular corner portions has its apex relieved to provide a coplanar margin.

Claim 4

A fastener of the nail type adapted to be made in one piece from thin metal comprising a polygonal flat head having at least four sides arranged in opposed pairs and at least a first pair of opposed corner portions and at least a second pair of opposed corner portions between adjacent sides, a single pair of prongs integral with and projecting generally perpendicularly from the underside of the head at its medial portion and forming a pair of elongated spaced slots in said head, the elongated spaced slots extending in opposed side-by-side and staggered relationship whereby said slots have relatively adjacent offset inner end portions and relatively remote outer end portions, the prongs being disposed at the adjacent offset inner end portions of said spaced slots in offset relatively adjacent relationship at said medial portion of said head and relatively remote from the corner portions thereof, each of said spaced slots having its longitudinal axis extending at an acute angle to an adjacent side of one of the opposed pairs of sides of said head and its inner end portion spaced from the aforesaid adjacent side at a greater distance than its outer end portion whereby said prongs may be of maximum length without undue weakening of said head, the acute angular relationship of each slot to an adjacent side of said head disposing the transverse axis of each prong in nonparallel nonright-angular relation to any of said sides whereby there is less tendency for said prongs to bend when the fastener is driven from a position in which said head rests on one of its sides nonadjacent said slots and one of said prongs, said head being generally equiangular and generally equilateral and each of the second pair of opposed corner portions of said head being generally angular, and each of said second pair of opposed angular corner portions has its apex relieved to provide a coplanar margin.