US311380A - Alonzo b - Google Patents

Description

(No Model.) i A. B. SBE.

l PACKING PoR HYDRAULIC HST'ON'S. I 110.311,380'. n Patented Jan. 27, 18a-5,

UNITED STATES PATENT OFFICE,

ALONZO E. or Yonkers, NEW YORK.

PACKING FOR HYDRAULIC PISTONS.

SPECIFICATION forming part of Letters Patent No. 311,380, dated January 27, 1885.

Appication filed May 28, 1384. (No model.)

.To aZZ whom it may concern.-

Be it known that I, ALONZO B. SEE, of Yonkers, in the county of \Vestchester 'and State of N ew York, have invented a new and useful Improvement in Packing for Hydraulic Pistons, of which the following is a specification.

My invention is more particulaly`applicable to thepistonsoi' hydraulic elevators which move vertically in their cylinders; but it is also useful for other hydraulic pistons.

The invention relates only tp that class of packing which consists ot' a cup-packing, of

leather or other analogous material, secured to the piston-body, and packing-rings surrounding the leather cup and having a bearing upon the inner periphery of the cylinder, the surrounding rings being forced outward by the pressure of water acting on the interior of the cup to expand it or spread it outward.

The repair ot' the packings of the kind above described is a frequent source of annoyance and expense, necessitating the temporary stoppage of the elevator; and the object ot' my invention is to provide a packing in which the wearing portions are of metal, thereby giving them great endurance and resistance to wear, while the remaining portions are of flexible or yielding material, which will cause and maintain a close and tight contact of the metal of the packing with the met-al of the cylinder.

rlhe invention consists in novel combinations of parts, hereinafter described, and par'- ticularly pointed out in the claims.

In the accompanying drawings, Figure l is a sectional elevation ot' a portion of a cylinder and a piston embodying my invention. 2 is a horizontal section on the dotted line x r, Fig. i; and Fig. 3 is a perspective view illustrating a portion ofthe packing.

Similar letters of reference designate corresponding parts .in all the figures.

A designates the cylinder, otwhieh a .portion only is represented.

B designates the piston, which may be of cast-iron, and which is constructed at the lower part with a shoulder, a, beyond which projects a circular portion, B', ot' smaller diameter, and from the portion B projects a hub or boss, b, y f l C designates the follower ofy ythe piston,

Fig.

leather cup outward or expand it.

which lits upon the hub or boss b, and is thereby held concentric with the piston, and which is secured to the piston-body by bolts c. The piston-body and the follower C all lit loosely within the bored-out cylinder A, and the packing hereinafter described makes a tight joint with the cylinder.

D designates the piston-rod, which is to be secured immovably in the piston in any suitable manner. As here shown, the rod is inserted from the bottom ot' the piston, and is held against movement in the piston by means of a taper head, d, and a nut, eZ; but the rod may be secured in the pistonin any other wellknown or suitable manner.

E designates a leather cup-packing,the edge of whieh'proiects upward around the circular piston portion B, and which is clamped between the follower C and the piston-body. Free access for water to the interior of the packing is afforded by the holes e,which may be several in number, and through which, as the piston descends, water passes to pressthe rlhe portion of the packing external to the cup E is composed of two or more inner rings of any suitable iiexiblc packingsuch as canvas and rubber, or, Tucks packing-square or rectangular in cross-section, and two or more sectional outer rings of metal corresponding to the rings of ilexible packing. Each ilexible and metallic ring form together a compound ring.

lbhaveher shown the upwardly-turned and cylindric portion ofthe cup-packing E as surrounded or embraced by three rings, f f f2, of flexible packing, and encircling these are three similar ringsg j g2, of metal, which are each made in sections,y and which form the wearing-surface of the packing. The packingrings are all held in place between the shoulder a and the follower C.

The rings g g g2 are each composed og two or more sections. In this example of the invention three sections are employed, as shown in Fig. y2, and the joints g* between the sections are chamfered off or scarfcd tangenti..l to a circle smaller than the ring.

I have shown the three sections composing each metallic ring g, Src., as each secured to IOO the corresponding flexible ring f, &., by rivetsf=l, three being here shown to each section, l circular or and thus the three sections of each metallic ring are securely held upon the corresponding flexible ring. The threenetallic rings are held together by means of clasps or clips h 71.,which are made ofsheet met al. The clasps or clips lzy are screwed or riveted to the middle metallic ring, y', and catch and hold the upper ring, g. The clasps or clips Il.' are screwed or riveted to the lower ring, ff, and catch and hold the middle ring, r/. In this way the three metallic rings are connected, and thc sections ot' each being riveted to the corresponding flexible ring, the whole packing can be withdrawn as one piece when the follower is removed. These clasps also hold the ri ugs together when applied in the piston, Msome means of holding them together beingl very desirable, as the rings will always be left loose between the shoulder a and the follower C, to obviate any tendency to bind which might result;- l`rom the swelling of the flexible packing, and which mig-ht impede the expansion ot' the metallic rings, which is necessary to compensate for the w "ar ot' the said rings and the cylinder. The water, entering the interior ofthe cup E through the holes c, forces the cup outward, and the several flexible rings serve to evenly distribute the outward pressure upon the metallic rings and hold their sections in tight wol-kiln.;` contact with the cylinder A.

I am aware that cupleather packings have been used in hydraulic pistons with various kinds of rings surrounding the cup-leather, and I do not claim snella packing, broadly, as ot' my invention.

The particular combination which is hereinabovedescribedistheresultoflone; experiment to secure a packing which would possess the durability, freedom from leakage, and provision for reiniwal, which are all necessary requisitcs of a packing|` for hydraulic elevators. The enplent her, behind which thcwater acts, serves to transmit a uniform pressure to cach portion of the. packing which surrounds it. The metal rings only come in contact with the cylinder, and hence will not wea r as rapidly as rings of flexible material. lhe metal rings, being in sections, adapt themselves to the bore of the cylinder whether it be truly not, and the flexible rings serve each to support the sections ol'an outer metal ring and allow of the sections yielding inde pcndently of each other, and also transmit to the metal ring; the outward pressure which it receives from thc leather cup. The series of compound rings arranged one above another also adapt themselves to inequalities in the length of the cylinder, and the single cuppacking around which theyarc placed serves to press them all outward and prevent outward leakage between them.

I am not aware that the combination of' cupleather packing and a number of compound packingrings, all constructed and arranged as above particularly pointed out, has ever been used prior to my invention, and such combination and arrangement only do I desire to include in my invention.

What I claim as my invention, and desire lo secure by Letters Patent, is-

1. In a hydraulic piston, the combination, with the piston-body B, having water-pas Sages e, and the follower C, of the packing consisting of the cup-leather l and a number ot' compound packingfrings surrounding,r the cup-leather, one above another, and each comprising an inner ring, f, ot' flexible material bearing on the cup-leather, and au ontcr me? ,t

tallic ring,g, composed ot' sections secured to the flexible ring, the several metallic rings forming the wearingsurface of the packing,r and the several flexible rings forming,r a yielding support to the metallllcrings, and serving to transmit to them the outward pressure of the cup-leather, substantially as herein del scribed.

2. In a hydraulic pistonpacking, the combination, with a cup-packing, ot compound packing-rings surrounding'said cup-packin0, each compound ring,r consisting ot' an inner flexible ring and an outer metallic ring secured thereto, and clasps or clips connect-ingr the several compound rings, substantially as and for the purpose herein described.

ALONZO B. SEE.

Witnesses:

Fianna. IIAYNEs, EMIL SoiIWAR'rz.

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