US156987A - Improvement in water-cocks - Google Patents

Description

A. D. DAVIS y Water-Cocks I a vK6.

Patented`Nlov.17,1874.

me annum comubrmnnusam PARK momma f UNITED STATES PATENT OFFICE ALBERT D. DAVIS, OF CHICAGO, ILLINOIS.

IMPROVEMENT IN'WATER-COCKS.

l Specification forming part of Letters Patent No. 156,987, dated November 17, 1674; application filed March 14, 1874.

To all whom it may concern:

Be it known that I, ALBERI` D. DAVIS, of Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Water-Cocks; and I do declare that the following is a true and accurate description thereof, reference being had to the accompanying drawing, and to the letters of reference marked thereon, and being a part of this specification, which shows a vertical section ofthe water-cock.

'Ihe nature of this invention relates to an improvement in that class ot' cocks whose valves are held closed by the pressure of the water in the service-pipe.

The invention consists of a novel construction of the same by forming an airchamber in the body of the cock below the valve, in such a position as to cushion the water-column, and avoid all pounding of the valve on the valve-seat when the valve is closed by the pressure ofthe water.

In the drawing', A represents the air-chamber, whose mouth or opening is at a.- B is the rubber ball-valve, closing against the valve-seat b. The mouth a dips into the chamber A, so as to form an inverted vessel, from which the 'air cannot escape when the month a is occupied and closed by the water from the service-pipe; andwhen the flow of water through the cook is arrested by the closing of the valve B, the elasticity of the air confined in said chamber will cushion the watercolumn, and prevent the effect known as water-hammer.

Heretofore manufacturers have been unable to make a durable water-cock whose valve closes with the pressure, for the reason that the water, when turned on full force and suddenly checked, produces a heavy thump, varying according to the pressure of water. This thumping not only injures the cock itself, by speedily wearing out the valve, but also the plumbing throughout the building ismore or less shattered by the continual pounding produced by the water-pressure.

By the simple and inexpensive use of an air-chamber attached to the shell of the Watercock below the valve, to form a cushion for the water to ram against, this objection is entirely avoided.

Having fully described the essential points of this invention, what I claim is- A Water-cock constructed with an air-chamber, A, situated below the valve-seat, and within the shell thereof, substantially as set forth, in combination with a seat, b, and valve l B, arranged as set forth, to open against the water-pressure.

A. D. DAVIS.

Witnesses:

J. BEEVER, A I. B.W1G1IT.

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