초록 ▼

A multi-pronged thumbtack which includes a head and a plurality of tines projecting from the head in the same direction to assure that paper impaled upon the tines will not be able to rotate around the axis of any one of the tines. In general, the head has at least one monoplanar side from which the

A multi-pronged thumbtack which includes a head and a plurality of tines projecting from the head in the same direction to assure that paper impaled upon the tines will not be able to rotate around the axis of any one of the tines. In general, the head has at least one monoplanar side from which the tines extend codirectionally, and three tines are preferably disposed at the corners of an equilateral triangle.

대표청구항 ▼

A thumbtack which comprises: a synthetic resin head comprising: a generally cylindrical base portion having a substantially monoplanar surface at one side thereof; a generally cylindrical neck portion of smaller diameter than said base portion projecting from the opposite side of said base portion f

A thumbtack which comprises: a synthetic resin head comprising: a generally cylindrical base portion having a substantially monoplanar surface at one side thereof; a generally cylindrical neck portion of smaller diameter than said base portion projecting from the opposite side of said base portion from the side at which said monoplanar surface is located; and a shoulder between said neck portion and said base portion; and three metallic tines including three portions having substantially parallel axes projecting from said monoplanar side of the base portion of said head, and projecting in a direction which is substantially perpendicular to said monoplanar surface, each of said tines having a generally L-shaped portion embedded in said base portion of said synthetic resin head, and said tines collectively further including three centrally located contiguous shaft portions extending from said L-shaped portions and embedded in said generally cylindrical neck portion of said synthetic resin head.