Motor control center removable control unit interlock

Details Motor control center removable control unit interlock Motor control center removable control unit interlock

1994-10-19

1996-01-23

Scott, J. R.

Electricity: circuit makers and breakers

Interlocking

Between plural switches

200 50AA, 361609, H01H 920

Patent

active

054866634

ABSTRACT:
A manually rotatable latch of a control unit has an oblong cross-section shalt extending through a keyhole slot in a slider, the wide dimension of the shaft being greater than the narrow portion of the slider, to block movement of the slider when the latch is extended to lock the unit to the cabinet or block insertion of the unit to the cabinet. A link from the slider extends into the path of movement of an operator to block movement of the operator to an ON position of switching apparatus of the control unit when the latch is extended. The link takes advantage of optimal latch location substantially centered in the control unit to minimize twisting of the unit within the cabinet when removal is attempted without releasing the latch.

REFERENCES:
patent: 2186640 (1940-01-01), Jirka et al.
patent: 4074091 (1978-02-01), Bischof et al.
patent: 4912599 (1990-03-01), Wittmer
patent: 5019676 (1991-05-01), Heckenkamp

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