Electrical interlock

Details Electrical interlock Electrical interlock

1984-08-28

1986-04-15

McQuade, John

Geometrical instruments

339 75R, 339 91R, H01R 13631

Patent

active

045823812

ABSTRACT:
In a machine (10) such as electronic typewriters having a functional package (30) which contain electronic components (31) and (21) respectively, an interlock (13a, 40, 50) inhibits the plugging in and removal of the functional package (30) without removing the plug end (13a) of a line cord (13) from the receptacle (14) on the machine (10). In the receptacle (14) associated with the plug end (13a) of the line cord is the distal end portion (41) of a biased bellcrank (40). The functional package contains a locking bar (50) which extends horizontally of the package (30). Upon insertion of the power cord plug end (13a) into the housed receptacle (14) the bellcrank (40) is caused to rotate engaging the lock bar (50) by passing through an opening (36a) on one side (37a) of the functional package (30). Upon engagment of the locking bar (50) by the bellcrank (40), the locking bar (50) is displaced through an opening (36b) in the opposite side of the functional package (30), and the locking bar (50) moves into locking position in the adjacent aperture (47) of the machine. In this manner, movement of the functional package (30), relative to the machine (10), is inhibited by the locking action of the interlock making it impossible to unplug the functional package (30) without removing power from the machine. The remote or extended end of the bellcrank, in a like manner, by itself prevents the insertion of the functional package (30) by engagement of the lower end of the functional package (30) against the terminal or remote end portion (45) of the bellcrank (40), if insertion of the functional package (30) is attempted without removal of the plug end (13a) from the receptacle (14).

REFERENCES:
patent: 114782 (1871-05-01), Engelbrecht
patent: 1818366 (1931-08-01), Vargo
patent: 2202916 (1940-06-01), Mussa
patent: 3388938 (1968-06-01), Peterson
patent: 3634732 (1972-01-01), Finger et al.
patent: 3660798 (1972-05-01), Marzec
patent: 3728586 (1973-04-01), Inhelder et al.
patent: 3917372 (1975-11-01), Selinko
patent: 4118133 (1978-10-01), Kupfer

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