Fastening device
OwnerWalter Henry Landinventor
Life of this patent
Estimating the term…
Abstract
A quick-release paper fastener of polypropylene-ethylene copolymer for stacks of two holed sheets and comprising a tongued base member and a compressor which has resilient hooks provided with transverse V-shaped ribs on the undersurface which co-operates with a central V-shaped groove on the outer surface of the tongue to provide a snap-fit locking and quick release arrangement and the compressor has a transverse bar near each slot which engages with transverse grooves and ribs or notches on the inner surface of the tongue to prevent longitudinal slipping of the tongue when folded over in the fastened position.
Claims10
A flexible, two-piece paper fastener constructed of plastics material and comprising a compressor with an aperture adjacent each end thereof, a base with an integral tongue extending from each end thereof, the junction of said base and each said tongue having a design radius forming a plastic hinge, one surface of each said tongue being roughened to engage a transverse knife edge on said compressor for engaging each said tongue when inwardly folded toward one side of said compressor as a means to prevent accidental longitudinal slipping of said tongue from said compressor, integral hook members, each having a post portion which is rigidly attached to said one side of the compressor and a transversely extending arm portion having catch means on its underside for engaging complementary catch means on the other surface of one said tongue to releasably retain said tongue in a snap-locking and quick-release arrangement under said arm portion to lock said tongues against accidental lateral displacement from said compressor.
A two-piece paper fastener, comprising:
- A. an elongated base member, comprising a pair of longitudinally extending tongues at the opposite ends thereof, each tongue of said pair of tongues having a roughened surface on one side thereof and a longitudinally disposed groove on the other side thereof;
- and
- B. an elongated compressor, comprising:
- 1. a central plate portion having a tongue-contacting surface, a paper-contacting surface, and a pair of slots at opposite ends thereof, the distance between said slots being equal to the distance between said opposite ends of said base member,
- 2. a pair of transverse rib members, rigidly attached to said central plate portion, which are closely adjacent to said pair of slots and disposed therebetween, said rib members projecting beyond the plane of said tongue-contacting surface and terminating in a means for frictionally engaging said roughened surfaces of said pair of tongues, and
- 3. a pair of resilient hook members, which are disposed between said pair of slots as an upstanding tongue-engaging and release means for said pair of tongues, each said hook member comprising:
- a. a rigid post section which is rigidly attached to said tongue-contacting surface,
- b. a resilient arm portion which is rigidly attached to said post section and disposed at about 90.degree. thereto and transversely to said elongated compressor so that said arm portion is spaced from said tongue-contacting surface, and
- c. a projection extending toward said tongue-contacting surface from the inner surface of said arm portion, whereby said projection engages said longitudinally disposed groove in one said tongue of said pair of tongues as a means to prevent accidental lateral displacement of said pair of tongues from said pair of resilient hook members.
A paper fastener constructed of resilient plastics material selected from the class consisting of polypropylene and polypropylene/polyethylene copolymer and comprising a base member with a pair of foldable tongues, each tongue having a centrally disposed longitudinal groove in its outer surface when said tongue is folded inwardly, and an apertured compressor for receiving and releasably fastening said tongues after the tongues have been passed through the apertures in the compressor and inwardly folded upon the compressor, said compressor comprising a pair of resilient hook members which are rigidly attached to the compressor and disposed in mutually opposed relationship, each said hook having a transverse rib on the underside thereof engaging one said centrally disposed longitudinal groove.
Dependencies are inferred from the claim text.