Closure fasteners – Bolts – Double acting
Patent
1983-05-02
1985-01-01
Moore, Richard E.
Closure fasteners
Bolts
Double acting
292DIG22, 292DIG38, 292DIG60, 292DIG62, E05C 1902
Patent
active
044913532
ABSTRACT:
A reciprocatory device in the form of a roller door catch has a reciprocatory plunger slidable in a fixed tubular housing and retained therein by an adjustment member. The plunger is urged to a normal resting position by a compression return spring. At its outer end the plunger rotatably supports a catch roller engageable with a recessed keeper mounted on the door frame. The adjustment member has a stem portion which projects into a blind bore at the inner end of the plunger, and this stem has radial stub projections which engage with a helical rib providing a screw thread within said bore, with a clearance in the axial direction approximating to the normal range of plunger reciprocation on door opening and closure. The adjustment member has a head portion with a frusto-conical clutch face which frictionally engages a mating clutch face at the inner end of the housing. The plunger is restrained against rotation within the housing, and a small amount of clutch slip as said clutch faces interengage on door opening provides an auto-set facility which compensates for variations in the gap between the door and the door frame at the shut face.
REFERENCES:
patent: 1154439 (1915-09-01), Scholfield et al.
patent: 2785915 (1957-03-01), Daffurn et al.
patent: 3133757 (1964-05-01), James
patent: 3322450 (1967-05-01), Russell et al.
patent: 3430399 (1969-03-01), James
patent: 3825289 (1974-07-01), Armstrong
Dubnicka Thomas J.
Micro & Precision Mouldings (Cheltenham Limited)
Moore Richard E.
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