US192409A - Improvement in pistons - Google Patents

Description

BECK.

PISTON.

Patented June 26-,'1877.

@NVENTOB:

WITNESSES:

moanns.

ROBERT M. BECK, OF WESTMINSTER,

MARYLAND, ASSIGNOR TO THE TAY- LOR MANUFACTURING COMPANY, OF SAME PLACE.

IMPROVEMENT 1N PISTONS.

Specification forming part of Letters Patent No. 192,409, dated June 26, 1877; application filed May 21, 1877.

To all whom it may concern Be it known that 1, ROBERT M. BECK, of Westminster, in the county of Carroll and State of Maryland, have invented anew and Improved Piston; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawing, forming part of this specification, in which- Figure 1 is a side and Fig. 2 a sectional view; Fig. 3 a detail of the continuous softmetal packing-rin g.

My invention relates to an improved form of piston, designed primarily to increase the durability and wearing qualities of the same; and it consists in the particular construction and arrangement of parts, as hereinafter fully described and pointed out in the claim.

In the drawing, A represents the piston-rod, and B B the two disks, of which E is pro vided with a central boss or hub, 11, and is made fast upon the pistonrod, while B is loose from the rod, and is provided with a central depression, b, corresponding to the hub 12, and also a concentric perforation to receive the screw-threaded end a of the piston-rod. These two disks are formed with beveled edges 0 c, and are brought together by means of a screw-nut, d, arranged upon the screwt-hreaded end of the piston-rod.

U is the packing-ring, which is made continuous and jointless, with a plain periphery and beveled inner edges corresponding to the bevel of the two disks. This ring is composed of any soft metal or composition of metal, but I prefer an alloy of tin and bismuth, as this is not injurious to the cylinder, and makes a good wearing material.

To prevent the ring from being packed too tightly from the action of the steam and thus rendered immovable in the cylinder, I locate a series of soft-metal washers, d, upon the boss 12 of the disk B, which washers determine the approach of one disk toward the other, and regulate the amount of the expansion of the ring to compensate for the wear, without der to permit the disks to approach the other so much, and by reason of their beveled edges give the proper amount of expansion to the packing-ring, the hub b and recess 12 operating as guides in the adjustment of the loose disk, so as to hold the latter concentric.

I am aware ofEnglish Patent N 0. 2,076 of 1854, in which are shown the features of the continuous packing-ring, and the guiding of the two parts of the piston by a boss or hub, but the piston here shown cannot permit the location of the Washers near the periphery, which, by reason of the greater area presented, is the most desirable place to resist steampacking, and it cannot employ a single nut to compress the two parts of the piston in expandin g the ring.

I am also aware of theEnglish Patent No. 2,990 of 1873, in which is shown a single not for compressing the two parts of the piston, and washers to determine their adjustment; but here it will be seen there is no boss and recess to efi'ect the guiding of the parts, and the washers are not arranged at their proper place near the periphery. 'By my arrangement it will be seen that I secure a threefold result; first, the expansion of the packingring by a single nut; secondly, the guiding of the parts of the piston by the boss and recess; and, thirdly, the arrangement of the washers near the periphery of the piston and upon the boss of the stationary part of the same, whereby the efi'ect of the steam upon the packingring is better obviated.

Having thus described my invention, what I claim as new is- The combination of the rigid disk B, having boss I), and the loose disk B, having depression b, with the interposed adjustingwashers (1, arranged upon the boss 1) near the periphery of the piston, and the continuous or jointless expansible metallic packing-ring C, substantially as described, and for the purpose set forth.

.ROBT. M. BECK.

Witnessesi -G. A. TAYLOR,

J. E. TAYLOR, J. J. BAUMGARTNER, Jr.

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