US683469A - Antifriction steam piston-head. - Google Patents

Description

No. 683,469. Patented Oct. I901. J. IMLER.

ANTIFRIGTIUN STEAM PISTON HEAD.

(Application filed Jan. 11, 1901.

(No Model.)

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UNTTED STATES PATENT OFFICE.

JOSEPH IMLER, OF FORT WAYNE, INDIANA.

ANTIFRICTION STEAM PISTON-HEAD.

SPECIFICATION forming part of Letters Patent No. 683,469, dated October 1, 1901.

Application fil d January 11, 1901. Serial No. 42,893. (No model.)

T0 (LZZ whom it may concern;

Be it known that I, JOSEPH IMLER, a citizen of the United States, residing at Fort lV-ayne, in the county of Allen and State'of Indiana, have invented certain new and useful Improvements in Antifriction Steam Piston- IIeads; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to steam piston-heads and is an improvement upon my application, Serial No. 23,472, filed July 13, 1900; and it consists in providing a hollow piston-head with a central diaphragm or partition, the diameter of which is considerably less than the end sections, thereby providing a continuous steam-chamber without diminishing the area of the piston-head.

Another object is to provide a novel means of mounting a valve-stem in the central diaphragm or partition and enable two valves to operate thereon.

Further objects and advantages will appear in the following description, and the novel features thereof will be particularly pointed out in the appended claims.

In the drawings, Figure 1 is a vertical longitudinal section of a piston-head which embodies my invention. Fig. 2 is an end view of the piston with one of the end sections re moved.

A represents a piston-head which is composed of the two hollow sections B and the central dividing-partition 0, all three parts of which are secured to the piston-rodD, which is passed through them and held by a nut at its end. These parts are also held together by clamping-bolts E, and these bolts are especially of advantage in large pistonheads, where the central nut is not strong enough to stand the strain. Each of the 1101- low sections is provided with a port F, leading from the outer side to the chamber H, and each section has a series of lugs or projections I, the ends of which engage the central partition C near its edge, and which lugs may also be provided with openings for the rod J, which acts as a valve-stem for the spring-pressed inwardly-opening valves K, mounted upon each end thereof and capable of longitudinal movement thereon. To prevent the springs from losing their resilience and to permit an even tension on them at all times, the valves are provided with an annular flange L, which envelops the spring, and

which flange abuts against the partition 0 when the valves open. This prevents the springs from being entirely collapsed.

As shown, the central partition is of less diameter than the inner edge of the chamfered portion of the end section and extends only to the edge of the lugs or projections, leaving space for the escape of the steam from one side of the section to the other, andthus forming one continuous chamber within the piston-head, and at the same time it provides a support for the rod which carries the valves.

When the piston is at the end of its stroke and steam is being admitted to the cylinder, one of the valves is opened and steam is ad mitted into the chamber, causing the valve on the opposite, side to close, and the steam is forced against the interior face of the opposite end section and circulates around the partition and completely fills the chamber. By means of these valves the chamber is always kept supplied with steam under pressure, and thus provides steam lubrication to the piston-head, for the steam passes between the ends of the end section to the inner sides of the cylinder, and the chamber being always filled with steam forms a cushion. to prevent friction and the dragging of the pistonhead upon the bottom of the cylinder, and thus enables the piston-head to be held in equilibrium. \Vhen the piston nears the end of its stroke, a portion of the trapped steam left in the cylinder after the exhaust-valve has closed is forced through the valve-openings and into the steam-chamber, and thus relieves the piston of the heavy back pressure of the trapped steam on the exhaust side.

Having described my invention, what I claim is 1. A piston composed of two hollow end sections and a dividing-partition placed between them, a rod held by the partition and carrying valves.

2. In a piston-head, the two hollow end sections and a central partition, a rod supported by the partition, and valves slidably mounted upon the rod.

8. In a piston-head, the two hollow end sec tions, and a central partition placed between them, the end sections being provided with ports, and the partition having means for carrying valves to control said ports, substantially as described.

4. In a piston-head, the two hollow end sections, and a central partition placed between them, the end sections being provided with ports, and the partition having a rod passed transversely through it,spring-pressed valves slidably mounted upon said rod and control ling said ports, substantially as described.

5.- In a piston-head, the two hollow end sections, and a central partition placed between them, the end sections being provided with ports, and the partition provided with means for carrying spring-pressed valves to control said ports, said valves having an annular flange to envelop the springs, substantially as described.

6. In a piston-head, the two hollow end sections, and a central partition placed between them, the partition carrying a rod; valves and coil-springs mounted upon the rod, and means to prevent the springs from being entirely collapsed upon the rod, substantially as described.

7. In a piston-head, the two hollow end sections,combined with a central partition placed between the sections, the end sections being provided with lugs or projections which bear against opposite sides of the central partition near its edge or periphery and leaving an unobstructed passage for the steam to all parts of the steam-chamber, substantially as shown.

8. In a piston-head, the two hollow end sections and a central partition placed between them, the end sections being provided with lugs or projections, and the partition being of less diameter than the chamfered inner edge of the end sections and being embraced by the lugs at its edge, thereby leaving an unobstructed passage for the steam to all parts of the chamber, combined with means for admitting the steam to the chamber and maintaining it there under pressure, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

JOSEPH IMLER.

Witnesses:

THEODORE DALTON, L. S. BLACK.

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