Duplex latch-bolt mechanism

Details Duplex latch-bolt mechanism Duplex latch-bolt mechanism

1989-03-28

1991-12-24

Nicholson, Eric K.

Closure fasteners

Bolt casings

29216914, 292 15, F05C 116

Patent

active

050746057

ABSTRACT:
An improved duplex latch-bolt mechanism is composed of a latch-bolt head assembly and a latch-bolt transfer device adapted to make a selectable connection with a standard latch-handle assembly having a square transfer member and a pair of cylindrical support nuts provided for use in a door fitting arrangement. The latch-bolt transfer device includes: a bolt extracting member with a central open section connected to the latch-bolt head assembly; an upper coupling member and a lower coupling member, connected around the extracting member, each formed with a plurality of selectable openings; a displacement member with a cam through opening ajustably joined with the upper and lower coupling members for being operated to define two selectable positions along with the upper and lower coupling members according to the door fitting arrangement; a cam setting device movably disposed in the open section of the bolt extracting member for being connected to the square transfer member during the performance of locking and unlocking operations; and a transfer locking member disposed on the displacement member for keeping the cam setting device in position.

REFERENCES:
patent: 1661454 (1928-03-01), Wilson
patent: 4575137 (1986-03-01), Jans
patent: 4615549 (1986-10-01), Couture
patent: 4711477 (1987-12-01), Fann et al.
patent: 4746154 (1988-05-01), Fang
patent: 4750766 (1988-06-01), Shen
patent: 4804216 (1989-02-01), Marotto
patent: 4850626 (1989-07-01), Gallego
patent: 4890871 (1990-01-01), Lin

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