US146750A - Improvement in glands for stuffing-boxes - Google Patents

Description

2 Sheets--SheetI I. N C0 L BY K 'gl 7 A jaw/dw;

1.`N.coL"Y.` Glands for Stung Boxes.

Patented Jan. 27, `1874.

UNrrnn STATES PATENT OFFICE. N

JOHBT N. COLBY, CF MYSTIC, CONNECTICUT. y

IMPROVEMENT IN GLANDS FOR STUFFING-BXES.

Specification forming part of Letters Patent No. 146,750, dated January 27, 1 874; application filed June 11, 1873.

To all whom it may concern: i

Beit known that I, JOHN NEWTON CoLBY, of Mystic, in the county of New London and State of Connecticut, have invented certain new and useful Improvements in the Glands and Packing of Stuffing-Boxes for Piston and other Rods; and I do hereby declare the following to be a full, clear, and exact description ofthe invention, such as will enable others skilled in the art to which it pertains to make and use it, reference being had to the accompanying drawings, which form part of this specification. My invention relates to an improvement in glands for stuffing boxes for piston-rods, valverods, pump-plungers, and for stuffing-boxes when used in other situations; also, to a novel method of arranging the packing within the stuffing-box, by which scraps and short-bered packing may be used as e'ectively as long packing.

The first part of my invention consists in forming the lower interior part of the gland around the piston-rod. In this groove a small quantity of packing is placed, and pressed against the rod by the small gland.

The second part of my invention consists of a case formed by wrapin g card-board, paper, or cloth made from asbestus, or anything else of a similar nature, around the piston-rod, and pressed down into the stuffing-box. The space lbetween the case and the stuffing-box is then filled with short packing, and the gland, being screwed down, turns the upper edge of the case over and incloses the packing. The effect of this arrangement is that the rod is closely packed, and at the same time the case prevents the short packing in the box from bein g blown out.

Figure l is a sectional view of the gland. Fig. 2 is a sectional view of the gland, showin g the packing-case. Fig. 3 is an elevationof packing-ease open. Fig. 4 is an elevation of packin g-case closed.

As shown in Fig. l, the gland A is formed, at the lower interior part thereof, with a conical hollow, I), the largest circumference thereof being at the lower end of the gland, where it enters the stuiiing-box. Into this hollow the packing enters, when the` gland is screwed down by means of the bolts or studs 1) and nuts D. i The interior conical surface B is turned with a series of annular rings, c, ex-` tending from the bottom ,to the top, which gradually diminish in their internal diameter, the least diameter being at the top or upper part of the hollow These rings may be turned so as to represent a plain stepped section, as shown at Fig. l, or they may be turned shaped like saw-teeth, presenting a serrated section. The interior surface of the conical hollow B, being thus rendered uneven or stepped, allows of a better gripe or hold of the packing being obtained by the gland when forced into it, and on the glandy being forced down into the stuffing-box by the screws, its lower edge passes between the walls of the stuffingbox and the packing, and compresses it laterally or circumferentially and endwise against the rod. There is` no immediate downward pressure exerted upon the packing by this gland; the pressure is principally lateral. The interior surface B being at a sharp angle to the sides of the gland, the `tendency is to compress the packing closely against the rod, and it is only by degrees, as the'packing `wears away, that it is forced downward into the stuifing-box. In the passage 'of the gland downward the rings c take hold of the packing, and

revolve it, thus presentinga new packing-surface continuallyto the action of the rod. It

is a peculiar merit of thisy gland that it permits a surface of packing'of the same depth as the stufting-box'to bealways against the rod, and prevent the leakage of steam, while in the old form the surface was continually becoming' narrower, and in consequence the liability to leakage greater. `yAs a further precaution against the escape"of steam, a cap or secondary gland, F, is placed at the outside end of the gland A, the lower part of which fit-s into an annular space, d, formed around screwed down by means of bolts or studs f and nuts f. This device is intended to prevent the possibility of any leakage taking place, even though there be a defect in the gland A. However high the pressure may be, or however bad the rod, the device I have here described will be found to present an effectual barrier to any possible waste or leakage. The last part of my invention relates to a method of arranging the packing in the stufng-box, and is applied with my improved gland. This device is made by cutting strips from cardboard, paper, or cloth made from asbestus, or other suitable material. These strips should be at least as long as the stuffing-box is deep. They are wrapped around the piston -rod closely, and fastened with wire, string, or elastic. This case can be made of a single piece of card-board, paper, cloth, or other iibrous or textile material, or it may be made of several pieces, so as to break joints, as shown in Fig. et. In rFig. 4, G represents the case after it is fastened around the rod. After being secured, it is forced down to the bottom of the stuffing-box. Its upper end `should then be slit, as shown lat g in Fig. 2.

The edge is then turned outward from the rod. The space between the case Gr and the stuffingboX is then filled with any kind of packing, as cork, shavings, hemp, flax, cotton, jute, or asbestus, as shownat i. The gland A is then screwed down into the box, and those of the annular rings c which are nearest to the rod catch the ed ge of the case, which is turned over, and press it outward from the rod, thus closing over the loose packing, and preventing it from being blown out by the steam. By this arrangement the rod is ei'ectually packed, and at the same time much packing which would otherwise be wasted is utilized.

I claim- 'i l. The gland A, with the interior conical hollow B, and the interior surface thereof turned with the annular steps c, as and for the purpose described. f

2. The case G, arranged to close over the loose packing in stuffing-box c, in the manner herein set forth, in combination with gland A,

having interior conical hollow B and stepped or ringed surface c, as and for the purpose hereinbefore described and set forth.

In testimony that I claim the foregoingI have hereunto set my hand this 22d day of May, 1873. y

JOHN NEW/"EON COLBY.

W'itnesses CHARLES H. COTTRELL, JAMES CAMPBELL.

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