US1833343A - Pump piston - Google Patents

Description

Nov. 24, 1931. B, E, T'YLER 1,833,343

PUMP PI STON Filed Feb. 15, 1950 Patented Nov. 24, 1931 UNITED STATES BERT E. TYLER, DE LOS ANGELES, CALIFORNIA PUMP PISTON Application filed February 15, 1930. Serial No. 428,673.

This invention relates to pump pistons and is an improvement over my co-pending application bearing Serial No. 369,590, filed June 10, 1929. v

The object of this invention is to provide a piston constructed in such a manner that the fluid pressure developed within the cylinder during operation of the pump will expand packers of the piston into engagement with the liner or cylinder wall.

Another object of this invention is to provide a piston having resilient packing rings held in place on the piston by metallic retaining members in such a manner that the parts forming the piston may be easily and quickly assembled.

Other objects and advantages will be apparent from the following description, refcrence being had to the accompanying drawings, in which:

Fig. 1 is a sectional view taken through a pump liner and the improved piston;

Fig. 2 is a front elevation of the packing;

Fig. 3 is a sectional view taken on line 3-3 of Fig. 2;

Fig. 4 is an elevation of the packing;

Fig. 5 is an end view of the metallic retaining member;

Fig. 6 is a sectional view taken on line 66 of Fig. 5;

Fig. 7 is a perspective view'of the core of the piston.

Referring more specifically to the drawings, 10 designates a pump liner in which is slidably mounted a piston generally designated at 12.

The piston consists of an annular metallic core 14, a pair of resilientpackers 16 and a pair of packing retaining members 18, the above parts are adaptedto be placed together and mounted on a piston rod 20 and are constructed as follows:

Referring to Figs. 2, 3, and 4 the packer 16 is shown as it appears before insertion into the pump liner and is in the form of an annular body of resilient material (preferably soft rubber) having a centrally disposed opening 22, an annular peripheral flange 23 encircling a hub or internal flange 24 and an annular boss 25 formed on its inner face, the 50 .flange is expanded beyond its normal diamhaving an outside diameter slightly less than that of the internal diameter or bore of the pump liner, each of its faces 36 being recessed as indicated at 37 and is provided with a 5 centrally disposed opening 38 to receive the piston rod 20.

Assembly of the piston is preferably done by first placing a packer on each of the retaining members, then placing one of the 70 units thus assembled designated at 40 on the piston rod, it being noted that one of the retaining members is provided with a tapered .pening corresponding to the taper of the piston rod, the core is then placed on the rod and the other unit of the packer and retaining member designated at 42 is placed on the rod and a tightening nut 43. applied to the threaded end of the rod. Tightening of the nut draws the parts thus assembled into engagement with the shoulder 45 formed on the piston rod.

The piston is adapted to be inserted into the liner or pump cylinder 10, the packers being compressed against the action of the rings 27 by a suitable tool. Referring to Fig. 1 it will be seen that the annular boss 25 on the packers rest in the recess formed in the core 14 and that the annular flange on the retaining members extends into the peripheral space between the flange 23 and hub or internal flange 24 of the packers, thus retaining or holding the packer firmly in place thereon.

During operation of the pump the fluid pressure developed Within the cylinder on the power stroke will be exerted on the internal area of the flange of the packers and expand same into engagement with the liner wall due to the fluid Within the space between surface 46 of the flange of the retaining member reacting upon the internal surface of the flange of the packer.

Reaction of the fluid upon the outer face 4:9 and inner face 50 of the packers Will force the same into tight engagement with the surface of the core, thereby-eflecting a fluid tight seal between the packers and core. Any wear on the flanges of the packers will be taken up by expansion of the split rings 27,

From the foregoing it will be seen that the piston above described is of simple and dur- 1 able construction, may be easily and quickly assembled, and is practically leak-proof.

l. A pump'piston comprising an annular core having an annular recess formed in each of its flat faces, a pair of packers each of which have an annular boss resting in the an nular recesses formed in said core, a pair'of Leashes second packer member of ring form provided with a peripheral and an internal flange, an apertured retaining member mounted on said rod, said member being provided in one of its faces with an annular recess, the internal retaining members having bosses extending into openings formed in said packers and engaging the surfaces of the recesses formed in said core, each of said retaining members having an annular flange encircling a hub formed on said packers, said packers having annular flanges encircling the flanges on said retaining members, and a split expansion ring disposed in a groove formed in each of the annular flanges of said packers.

52. A pump piston comprising an annular core, a pair of packers abutting the end faces of said core, a pair of retaining members having bosses extending into openings formed in said packers and engaging the surfaces of the recesses formed in said core, each of said retaining members having an annular flange encirclinga hub formed on said packers, said packers having annular flanges encircling the flanges on said retaining members, and a split expans1on ring d1sposed in a groove formed in eachof the an-

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