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US 4,022,421 AGranted
Delayed release valve for a fire hydrant
OwnerJack M. Carlininventor
Life of this patent
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Abstract
The invention is a delayed release valve for a fire hydrant which permits the fireman to couple a fire hose with the valve in place to a fire hydrant, the valve being released subsequent to the coupling operation either by a timer which is set at the time the hose is attached, or by a radio-controlled servo mechanism so that the fireman who makes the hose attachment may proceed to the site of the fire and need not wait at the hydrant until on-site firemen are ready for water.
Claims6
A delayed-release valve for a fire hydrant comprising:
- a. a housing defining a self-contained water chamber with an inlet and an outlet;
- b. means to connect said inlet to a fire hydrant and said outlet to a fire hose;
- c. a movable gate pivotally mounted in said housing at one side of said inlet and movable by water pressure existing at said inlet from a first position sealed against said inlet to a second position clear of said inlet;
- d. a second gate hinged to said housing on the side of said inlet opposite the side to which the first-mentioned gate is hinged, said second gate being pivotal between a position free of said first-mentioned gate to a position parallel to and flush against same to hold same in sealed position such that the free end of said first gate is restrained by said second gate primarily near the pivoted end of said second gate whereby said gates together define a leverage multiplier for restraining water pressure;
- e. means releasably engaging said second gate by the free end of said second gate to hold said second gate in said first position;
- f. a control device mounted on said housing to effect releasing of said engaging means to permit the gates to move clear of said inlet.
3 more elements
Dependencies are inferred from the claim text.