Standpipe cap locking means

Details Standpipe cap locking means Standpipe cap locking means

1981-06-26

1983-08-09

Schwadron, Martin P.

Fluid handling

With lock or seal

Locks against rotary motion

137800, 251 90, 70177, 70212, 220315, 138 89, F16K 3502

Patent

active

043973329

ABSTRACT:
Unauthorized removal of the cap from a standpipe, such as a fire line standpipe, is prevented through use of a bent metal bar and a nipple formed at the center of the standpipe cap. The bar has an opening to accept the nipple extending from the standpipe cap, and a slot to receive a metal pin which prevents movement of the standpipe cap, rotation of the cap being prevented by additional means formed on the cap and bar. The bar can be so formed as to also prevent unauthorized removal of the handwheel of the valve which permits liquid flow through the standpipe opening.

REFERENCES:
patent: 1814343 (1931-07-01), Smith
patent: 3048189 (1962-08-01), Chandler
patent: 3623498 (1971-11-01), Manahan
patent: 3722549 (1973-03-01), Wilson et al.
patent: 3930389 (1976-01-01), Buikus
patent: 3949787 (1976-04-01), Milo
patent: 3980099 (1976-09-01), Youngblood
patent: 4289163 (1981-09-01), Pierson

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