US195707A - Improvement in cocks - Google Patents

Description

J. DEWRANCE 8 J. MALLINSON. COCKS.

Patented 0ct.2,187'7.

MPEI'ERS, FHOTO-LITMOGRAPHER. WASHINGTON. D C.

which improvements are fully set forth in the following specification, reference being had to -the construction of cocks the tightness of 'n the contrary direction. @i

UNITED STATES PATENT OFFICE.

-JOHN DEwRANcE, OE 176 GREAT DOvER sTREET BOROUGH, AND JAMES MALLrNsoN, OE wELwrN, ENGLAND.

IMPROVEMENT IN ooo-Ks.

Speciication'forming part of Letters Patent No. 195,707, dated October 2, 1877; application iiled August 24, 1877; patented in England, November 22, 1876, for fourteen years.

To all 'whom it may concern:

Be it known that we, JOHN DEwRANcE, of 176 Great Dover Street Borough, in the county of Surrey, and J AMES MALLINsON, of Welwyn, in the county of Herts, England, have invented new and useful Improvements in Cocks,

the accompanying drawings.

The object of our invention is to improve which is wholly dependent on the introduction of packing, and in no wise upon the t of the metallic parts. English Letters Patent for this invention were granted us November 22,1876, No. 4,540.

Figure 1 is a vertical section, and Fig. 2 is a horizontal section, of a cock constructed according to our invention. a is the shell, b is the plug, and c c are f glands. Thepacking is appliedin grooves al a,formed I in the shell at right angles to the direction of l the low of the fluid, and these grooves open into annular spaces a2 a2, running around the shell, one above and the other below the waf ter-ways. The plug b is taper in the opposite direction from that which is usual in plug-taps, the handle or instrument by which the plug is turned being applied at the smaller end of the plug. This arrangement is more convenient for applying the packing than ii' the taper were ough hemp or other packing may be used. The packing, after being well rammed into th grooves and spaces, is compr ssed by means of the glands c c. These glan s compress the packing especially at the ends of the plug, and the packing, together with the form ot the gland, prevents the plug from being forced into rubbing contact with the shell.

In order to prevent the current of steam, water, or other fluid rushing against the packing when the cocks are partly opened, we make the distance between the edge of the waterway and the edge of the recess in the shell a little greater than the width of the water-way.

We employ asbestus as the packing, al;

By this means the current is entirely cut od while the way in the plug is passing the packing. These wide marginal spaces or surfaces between the water way and the packinggrooves are in the drawing marked a3. As the way or peripheral opening in the plug, as shown, corresponds in width with that of the shell, it will be seen that it is also of a less width than said marginal spaces.

Fig. 3 is a vertical section of another cock constructed according to our invention. Fig. 4 is a horizontal section, Fig. 5 is an end elevation, and Fig. 6 is a plan, of the same.

In this cock, in order to reduce the enlargement of size which the provision of the wide marginal spaces a3 entails, we make the plug with a stop, and to work backward and forward a little over a quarter of a revolution. The stop upon the plug is marked b', and there is a corresponding stop or shoulder, c1, upon the gland.

It will be observed that in this cock the wide marginal spaces a3 at the sides of the waterway are provided on one side only ofthe inlet and the outlet, respectively, being` thus diagonally opposite each other at the sides of the waterway, so that for a given width of water-way the cock is of smaller diameter than when the plug is allowed to turn both ways, or all round. We also provide for the opening and closing of the cocks a toothed quadrant, d, iitted on the plug, and a worm, c, mounted on an axis V carried by the shell, and actuated by a hand wheel or lever. By these means the plug may be turned as slowly as may be desired, and the shock which results from the sudden closing of cocks upon water-pipes is avoided.

To adjust the working of the larger sizes of cocks, we sometimes insert into the bottom gland a regulating-screw, c2, with a lock-nut. The plug is supported upon the end of the screw, and as this is adjustable the plug can be eased off its bearing without slackening the gland. We sometimes introduce an india-rubber ring on the lower gland, at c3, as an eXtra security against leakage.

It will be observed that in this cock the glands are applied with bolts, and in Figs. 1 and 2 they are shown screwed into their places. They may be made either way.

Having thus described the nature of our said invention, and the manner of performing the same, We would have it understood that We claim- 1. The packed cock, constructed with the wide marginal spaces a3 at the sides of the water-way, so that the packing may never be exposed to the current of the uid, substantially as hereinbefore set forth.

2. The combination, substantially as hereinbefore set forth, of the plug, the shell, and the groove-packing at right angles to the iiow of the fluid, arranged at a distance from the edge of the fluid-way in the shell greater than the width of said Way, whereby the current is entirely cut off While the way in the plug is passing the groove-packing, and the packing thus protected.

JOHN DEWRANCE. JAMES MALLIN SON.

Witnesses:

G. B. WARREN, JN0. DEAN,

No. 17 Gracechm'ch Street, London.

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