US1750928A

US1750928A - Expanding piston

Info

Publication number: US1750928A
Application number: US357994A
Authority: US
Inventors: George W Galloway
Original assignee: Individual
Current assignee: Individual
Priority date: 1929-04-25
Filing date: 1929-04-25
Publication date: 1930-03-18
Anticipated expiration: 1947-03-18

Description

March 18, 1930. 5 w GALLOWAY 1,759,928

EXPANDING PISTON Filed April 25, 1929 i 1' 1 A6 7 r 1 &

Inventor 5. .6 W aZiazway Patented Mar. 18, 1930 UNITED STATES PATEN EXPANDING PISTON Application filed April 25,

This invention relates to pistons and more especially to expanding pistons adapted for use in internal combustion engines.

The primary object of this invention is to provide an improved expanding piston of this type which may be capable of adjust-' ment as to tension, the piston being cast in two parts, each art forming a spiral curve fitted together with overlapping flanges.

The springs creating the tension being fitted inside the pistons, are adjustably associated with the coupling or wrist pin of the piston.

A further object of the invention is to pro- 1 vide a piston of the type above set forth which will be comparatively simple in construction, readily and easily assembled or disassembled, and which will readily adjust itself to take up all wear and whereby an even tension on 29 the walls of the cylinder may be maintained at all times.

Another very important object of this invention is to provide an adjustable tension piston wherein the piston head is cast in two parts, one overla ping the other, to add strength and dura ility and to prevent leak- Figure 3 is a vertical sectional view of the piston at right angles to the point of view 5 shown in Figure 2.

Referring to the drawings in detail, it will be seen that the herein illustrated embodiment of my invention comprises a piston formed into two complemental sections 5 and 6. Each of the piston sections 5 and 6 com- 1929. Serial No. 357,994.

prises the

head portions

7 and 8 respectively and the complemental skirt sections 9 and 10 respectively. It is to be noted that the head portions of each of the sections is provided with the usual groove to receive the usual iston rings and that the downwardly extending skirt sections are each formed to provide the

usual bearings

12 and 13 respectively.

As illustrated the abutting edges of the 1 head and skirt portions of each of the complemental sections is irregular in outline, and it will be seen that the curve or split of the piston starts at the top of the piston in line with the center of the wrist pin bearing 12 on the section 6 and circles around to the bottom of the piston in the same position on the other side. In so forming the piston, each casting then forms a complete half circle so that the top 14 of the section 6, which is circular in plan view is disposed in overlapping relation with respect to the top 15 of the section 5, which top 15 is likewise circular in plan and the peripheral edge of which, at one point of the periphery is a apted to abut the inner face of the edge portion 8 of the complemental section 6.

It is also to be noted that bearings 12and 13 formed on intermediate ortions ofthe skirt of the respective section, extend inwardly of the piston to receive the opposite ends of a coupling or Wrist pin 16. The springs creating the tension are fitted inside the piston, each spring 17 and 18 respectively, being coiled about the

bearings

12 and 13 respectively, the outer end of which springs are adapted to impinge against the keys 18 and 19 respectively, which keys are fixed in suitable manner to the wrist in 16 at the opposite ends of the pin and a j acent the respective bearings.

It is apparent that the springs can be adjusted so as to tension with either set screws or split washers and that by means of tho tenslon, the piston adjusts itself to the wear on the cylinder walls.

From the foregoing then, it will be seen that I have provided a simple, yet durable and eflicient expansible piston, capable of use in internal combustion engines, and analogous uses, so constructed as to easily take care of the natural wear, allowin the piston to adjustitself to the walls of t e cylinder by means of the tension on the s rings inside the pistons as hereinbefore described. 5 While I have herein shown and described certain detail structural features of my in vention, it is to be understood that certain changes may be made therein, without departing from the spirit of the invention as described or the scope of the appended claims.

What is claimed is: 1. A piston composed of a pair of complei mental sections, each of said sections comprising a head portion and a skirt portion having their ad acent edges disposed in abutting relation, said adjacent edges being irregular in outline, a bearing formed on each of said skirt sections and adapted for alignment with 7 each other, a wrist pin extending through the aligned bearings, a coiled spring oneach of said bearings and keyed on the wrist pin against which one end of each spring is adapted to impinge.

2. A piston comprising a head portion, and

a downwardly extending skirt portion, diametrically opposed wrist pin bearings formed on the skirt portion and said piston being split to divide the piston into a pair of complemental sections, and said split defining a spiral curve starting at the top of the piston in line with the center of one of the wrist pin bearings, and circling around to the bottom of the piston in the same position on the other side of the piston, a wrist pin having its opposite ends received in the bearings, a coil spring on each of said bearings, and keys on the wrist pin against which one end of each spring is adapted to impinge for yieldingly expanding the two sections.

3. A piston composed of a pair of complemental sections, each of said sections comprising a head portion and a skirt portion having their adjacent edges disposed in abutting relation, said adjacent edges being irregular in outline, the head portion of each of said sections having extensions formed thereon adapted to overlie each other to form I a top for the piston, a bearing formed on the skirt portions of each of said sections, a wrist pin extending through the bearings, and a coil spring disposed about said bearing and adapted for engagement with the wrist pin as and for the purpose specified.

In testimony whereof I afiix my signature.

GEORGE W. GALLOWAY.