Plastic door lock

Details Plastic door lock Plastic door lock

1977-11-21

1979-10-02

Holko, Thomas J.

Closure fasteners

Bolts

Sliding

2923365, E05C 112, E05B 308

Patent

active

041696182

ABSTRACT:
A plastic door lock, sometimes referred to as a door latch, makes use of moldable plastic material for most of the individual parts of the lock assembly with opposite roses adapted to interlock with each other and be held together with a single screw on the axial center line of the knobs and accessible from the outside. When used as a privacy lock unlocking the lock from the outside is prevented by pushing the inside knob into a releasable but non-rotatable engagement with the inside rose. A lost motion connection between the latch bolt and roll back spindle allows the door to be closed without damage to the latch bolt when the inside knob is locked. Inherent resiliency in the material of the latch bolt case, in cooperation with the movable latch bolt, releasably returns and holds the latch bolt in extended position.

REFERENCES:
patent: 2709911 (1955-06-01), Russell
patent: 2741502 (1956-04-01), Crandell
patent: 3075797 (1963-01-01), Patriquin et al.
patent: 3105712 (1963-10-01), Duvall
patent: 3125366 (1964-03-01), Cetrone et al.
patent: 3179459 (1965-04-01), Lint
patent: 3186747 (1965-06-01), Hamm et al.
patent: 3240040 (1966-03-01), Wilson
patent: 3580622 (1971-05-01), Morgan
patent: 3724888 (1973-04-01), James
patent: 3858918 (1975-01-01), McBurnie et al.

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