US74750A - Setts - Google Patents

Description

QATENTED." FEBZ Vi868 Fig. 5.

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S. E. GHUB-BUCK AND ISAAC Y. CHUBBUCK, OF ROXBURY, MASSAGH- SETTS, ASSIGNCMSl TO THEMSELVES AND S. E. CHU'BBUGIQ' JR.

Letters APatent No. 74,750, dated February 25, 1868.

IMPROVEMENT IN PISTONS.

TO ALL WHOM IT MAY CONGERN:

Be it known that we, S. E. CHUBBUGK and ISA'C Y. GrIUBBUCK, both ofRoxbury, in the county of Nolfolk, and State of Massachusetta'have invented certain new and useful Improvements in Pistons for Steam-Engines; and we do hereby declare that the followingis a full and exact description thereof, reference being had to -the accompanying drawings, and tothe letters of reference marked thereon, thse drawings making part of this. specification. With reference to theml A Figure 1 is a perspective View of a. piston exhibited in position within the section of a steam-cylindertthe follower'ha'ving been removed'. from the piston to show the interior construction and arrangement.

Figure 2 is aperspective viewof two of the packing-ring secti'ons'formed in one piece. i

Figure 3 shows the same formed in two separate parts.

Figure 4 shows the sametwoparts of a packing-ring section adjusted together in their proper but separate relation. l i Figure 5 is a perspective view of the pistons follower. A

The nature of our improvement relates to the construction of the ring-sections and the devices for applying and' adjusting them, and rendering them self-adjusting, substantially` as I will proceed to describe.

A is a. section of a steam-cylinder, and within it isshown the piston, having the usual baeksface plate and centre hub, b, to receive the piston-rod and upon these are cast, in the usual manner, the arms c and hubs CZ, to which the follower e may be secured by screw-bolts, the back plate and the follower embracing, in the usual manner, the packing-rings. Inadditien to these, in our improvement we cast a. guiding-socket or box, f, open on the side next t'o the follower', and a-t theouter'end, and radiating from the centre hub between the arms c. The back side of this socket extends radially to the rim g of the piston. This rim extends around *the piston, and formsa surface to embrace the packing-rings upon the side opposite the follower, and may befdirectly on the back plate ofthe piston, or may be elevated somewhat from it, with space between, as shown, for lightness. The packing-rings are made up of the ring sections H.- The peculiarity of these sections is found in the different 1 and particular form of the two 'endsof eaeli'section, (see i j,) and their arrangement, togetherwith the springwedge K, (see Iig. 1.) The form of this wedge K, with enlarged head, allowing it to recede only to a given point, and the application of a spring, Z, to keep it pressed-out radially against tlie peculiarly-formed ends ofthe ringsections, will be readily understood from the drawing. v

That the form ofthe different ends of sections H may be betterunderstood, together with their utility, -we

Will explain that the ends jare formed in a single angular line-or plane, (see igs. 1, 3, 4,) while the other end, e', is formed in coincidence with two intersecting angular lines or planes, n m, the angles 22 and g each being formed to correspond with the angles ofthe heads of wedges K, and the angle 'r to match the extended angular end, q j, of theadjacent section when arranged together. The utility of this construction of the ends of the ring-sections consists in. not allowing the wedge to pass through against the cylinderas the parts wear away, and in affording therewith the facility at the same time to break the direct communication ofthe steam through the joint when the sections are arranged in reverse order in the different circular series, as shown in gs. 4 and 2. These sect-ions are also furnished with the lugs u, which, while they generally keep the rings from turning around, are so formed and tted,with reference to the ends of arms c, that in a horizontal cylinder' they support the two ring-sections, which come in a vertical position, from slidingdown upon the wedges, so as to relieve the contiguous section from its action. Fig. 2 shows two sections in reverse order, and formed into one, yet embodying the same peculiarities, and acting, perhaps, in some cases quite as efficiently.

It will be observed that this construction affords perfect facility for examining the adjustment of the parts while in position for working. By removing the follower e the interior parts are exposed to View, without any' disarrangement or disturbance of any of them.

Having described our improvements, what we claim as our invention, and desire tosecure by Letters Patent, is as follows:

1. We claimthe peculiar construction ofthe ring-sections H, substantially as described and shown.

2. We claim the open-sided radial grooves ff,';in combination with the spring-wedge K, Substantially as described.

3. We claim the lugs u, in combina-tion with the arms o r approximately vertical position, substantially as described.

c, to support those sections which work in n. vertical S. E. CHUBBUCK, I. Y. CHUBBUCK.

Witnesses:

D. N. B. COFFIN, Jr., IRAII D. SPAULDING.

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