Mechanical door interlock for electrical equipment enclosure

Details Mechanical door interlock for electrical equipment enclosure Mechanical door interlock for electrical equipment enclosure

1987-09-10

1989-02-21

Scott, J. R.

Electricity: circuit makers and breakers

Interlocking

Between plural switches

H01H 920

Patent

active

048067105

ABSTRACT:
A door interlock is provided for an electrical equipment enclosure which includes a drive/latch member carried by the door and a locking member carried by the enclosure. The drive/latch member is biased to a first position and movable into a second position. When the door is closed and latched, the drive/latch member is moved from the first position into the second position. During movement between the first and second positions, the drive/latch member engages the locking member and moves the locking member from a first position wherein a switch is prevented from being closed into a second position wherein the switch is permitted to be closed. When the switch is closed, the locking member is retained in the second position; the drive/latch member being retained in the second position by the locking member. With the drive/latch member in the second position, the door is prevented from being opened by cooperation with facilities carried by the enclosure. Accordingly, the door is held latched until the switch is opened, which returns the locking member to the first position and releases the drive/latch member. In a specific arrangement, the drive/latch member includes a protruding member which engages the locking member to drive the locking member to the second position. The locking member includes a hooked portion which, in the respective second positions, engages the protruding member of the drive/latch member to hold the drive/latch member in the second position. Additionally, the drive/latch member includes a hooked portion and the locking member pivots about a pivot pin. In the respective second positions, the hooked portion of the drive/latch member engages the pivot pin to prevent the door from being opened. Thus, the structure and cooperation of the locking member, the drive/latch member, and the pivot pin prevent movement of the drive/latch member relative to the locking member until the locking member is moved out of the second position after the switch is opened.

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patent: 4118607 (1978-10-01), Shaffer
patent: 4405844 (1983-09-01), Dizon et al.

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