Tubular door lock with a bell

Closure fasteners – Operators with knobs or handles

Patent

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Details

70467, E05C 116

Patent

active

048529222

ABSTRACT:
A sort of tubular door lock whose inside knob or outside knob can be forced to rotate by each other's rotation and force a rotating unit to turn pushing and overpassing a projection of a knocking spring to get the knocking points at its both ends to knock on a bell for ringing. In addition, when said inside knob is locked up, the outside knob has no supporting force for making the latch rotated but can give an idle turning only.

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patent: 356606 (1887-01-01), Thomas et al.
patent: 535288 (1895-03-01), Holman
patent: 691064 (1902-01-01), Lippincott
patent: 716471 (1902-12-01), Pickop et al.
patent: 818362 (1906-04-01), Edy
patent: 1030841 (1912-06-01), Colounese et al.
patent: 3039423 (1962-06-01), Warn
patent: 3240040 (1966-03-01), Wilson
patent: 3800573 (1974-04-01), Bobb, Jr. et al.
patent: 4577584 (1986-03-01), Shih

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