US1055222A - Piston-packing for steam-engines. - Google Patents

Description

0'. H. POLLARD.

PISTON PACKING FOR STEAM ENGINES,

APPLICATION PILED JULY 20, 1912.

Patented May. 4, 1913.

Guam

warmom is through the passages against the inner faeesand centers or, the;

STATES PAE I F'ENT OFFICE.

CHARLES H. POLLARII), or OAKDALE, TENNESSEE.

PISTON-PACKING FOR STEAM-ENGINES.

To an unto m itmay concern @Be it known that I, UHAnLi-as H. PoLLARo,

a citizen of the United States, residing at Oakdale, in the county of Morgan and State of 'lt-innessee, have invented new and useful Improvements in Piston-Packing for Steam-' injuring the wall of the cylinder, and at the same time avoiding the formation of vacuums in the opposite ends of the cylinders, which serve to retard the free back and forth movement of the piston, when not erforming its work under steam pressure.

Withthe above and other objects in view, the invention consists in the construction, combination, and arrangement of parts, as will be hereinafter more fully described,

illustrated in the accompanying drawings,

and pointed outv in the claim hereunto appended. v

In the drawingsr Figure .1 is an end view of a piston embodying the present invention. Fi 2 is a plan or face view, looking toward te periphery thereof. Fig. 3 is a diametrical-section through the piston. Fig. t'is a. detail perspective view of one of the piston rings.

Referring to the drawings, 1 designates a piston'of any desired size and general dimensions, the same being shown as provided witha plurality of grooves 2 to receive the pistmi-nngs 3, each of which is of the usual form in cross section, being shown as substantially square.

4 designates the piston rod.

In carrying out the present invention, a number of steam inlet passages 5 are formed in the op osite ends of the piston, said passages lea ing into the bottoms of the grooves 2, and opening up therein about centrally of thetra'hsverse dimensions of said groov as so. that the steam pressure passing-inner Specification of Letters Patent.

Application filed J'uly20, 1912. Serial No. 710.632.

be expanded in size and I111l11-' 5 W'lll. be dir ctgd Patented Ma r. 4 19113.

piston rings 3. Any desired number of said passages 5 may be employed in accordance with the size of the piston and other conditions. 1

Each piston ring is formed as shown in Fig. 4, and in the preferred embodiment ot the invention, each piston ring comprises three sections 6, 7 and 8. The sections 6 and 7 are divided transversely, as shown at 8, and the meeting faces of said sections are counter-bored, as shown at 9, adapting them to fit together on opposite sides of a pin 10 which extends across the groove in which the ring is received, and such pin is fastened to the piston, so that when the sect-ions (J and 7 are in engagement with said pin, the piston ring as a whole is prevented from turning around within its groove. By' roviding the packing rin sections with t e split abutting ends, as shown at the bottom of Fig. 4-, and forming said abutting ends with halt-round grooves which register with each other and form together a round opening, and by inserting a pin in the opening which fills the same, the sections are held in proper alinement with each other at all times, and the pin inserted in said hole serves as a brake joint or stop, preventing the leakage of steam or other expansive fluid at such point. This makes the packing ring at such point practically pressure-proo The section 8 of the piston ring is connected with the sections 6 and 7 by miter or oblique joints, as indicated at 11, thereby forming what may be termed a lap joint which will not have any tendency to score the wall of the cylinder in the back and forth movements of the piston rings. Furthermore, this allows the ring toexpand and contract, without permitting the steam to pass by the same. i

By means of the construction hereinabove described, the packing rings of a steam engine will last several times as long as the ordinary packing rings now in common use, for the reason that the wear thereon is materially reduced, in view of the fact that when the steam is cut off in a locomotive engine, for example, when the locomotive is drifting down a grade, the iston rings will ride loosely against the wa ls of the cylinders, and relieve the friction thereof, and also prevent the formation of a partial vacuum in the opposite ends of the cylinders, this resulting in allowing a much freer drifting,

sol-coasting of the engine down grade. w

also results in a mziterial reduction'of e1;- pense in the lip-keep of the engine, and en-' ables the same to be run for a much greater period of time, Without repair. "Furthermore, th'e' construction described will prevent the bursting of cylinder 'headsend other damage caused by the accumulation of water in the cylinder, and will adlnit of easy lubrication. 1

What is claimed is:

A pistonformed in its periphery with a in presence of sections having a hip joint at one piece and a joint at another place formed by providing the sections with square abutting ends having registering half-round grooves therein midway between the outer and inner feces oil. the ring and extending parallel to the axis of the piston, and a pin passing through'said'grooves and acting as a stop or closure for said joint, said pin. being car riedby the piston.

In testimony whereof I aim my signature of two witnesses. CHARLES- H. PQLLARD. Witnesses W. Y. BoswELL,

R, J. W LKm.

Images