Miscellaneous hardware (e.g. – bushing – carpet fastener – caster – Closure checks – Spring
Patent
1997-01-15
1998-06-09
Mah, Chuck
Miscellaneous hardware (e.g., bushing, carpet fastener, caster,
Closure checks
Spring
16 86A, E05F 506
Patent
active
057617660
ABSTRACT:
A piston door stop comprising a hollow first shaft, a hollow second shaft which partially contains said first shaft, a spring, a base screw, and a rubber cap. The spring extends through the bore of both shafts. The first shaft, second shaft, spring, and the rubber cap are coaxial. The door stopper is screwed into a wall via the base screw such that a bottom surface of a head of the base screw is in contact with the surface of said wall. A swung door first hits the rubber cap which covers the second shaft. The force is then transmitted to the spring which is contained within the two shafts, such that the second shaft moves along the first shaft towards the wall, compressing the spring which is contained within both shafts; thus causing the spring to absorb all of the energy transmitted from the swung door.
REFERENCES:
patent: 2140002 (1938-12-01), Dion
patent: 2479597 (1949-08-01), Anton
patent: 2540630 (1951-02-01), Munro
patent: 3160912 (1964-12-01), Heyer
patent: 4159837 (1979-07-01), Morita
patent: 4686740 (1987-08-01), Ishii
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