Lock for safety cut-out switch

Details Lock for safety cut-out switch Lock for safety cut-out switch

1975-06-11

1978-01-03

Hohauser, Herman J.

Electricity: circuit makers and breakers

High-potential type

Rotating and pivoted

H01H 928

Patent

active

040668568

ABSTRACT:
A bellcrank lever has a locking cut-out with an oblique edge towards the end of one leg and a second leg which engages a notch in a switch. A blocking lever has a blocking lug at its free end which engages the locking cut-out. Insertion of the key swivels the blocking lever clockwise and swivels the bellcrank lever counter-clockwise out of engagement with the switch notch. Withdrawing of the key causes the levers to swivel in the opposite directions. The blocking lug then engages an extension in the locking cut-out and blocks the counter-clockwise swivel of the bellcrank.
If the leg of the bellcrank lever cannot re-engage the switch notch, the oblique edge of the cut-out blocks the clockwise swivel of the blocking lever and the key connot be withdrawn.

REFERENCES:
patent: 1789462 (1931-01-01), Douglas
patent: 1826509 (1931-10-01), Douglas

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