US2020426A - Piston - Google Patents

Description

NOV. 12, 1935. s E E I 2,020,426

PISTON Filed Feb. 18, 1935 3 Sheets-Sheet l s 5 1% X 2 21's l 3 .H L l 7 3- 24' I 4 3 Inventor sze zenz S. E. MEYER- Nov. .12, 1935.

PISTON Filed Feb. 18, 1935 3 Sheets-Sheet 2 Inventor Nov. 12, 1935. s. E.'MEYER 2,020,426

' PISTON Filed Feb. 18, 1935 3 Sheets-Sheet 3 Inventor Patented Nov. 12, 1935 UNITED STATES PATENT OFFlCE PISTON Stephen E. Meyer, Hayden, Ariz. Application February 18, 1935, Serial No. 7,128

3 Claim.

This invention relates to a piston for internal combustion engines, vacuum pumpsor any other type of machine using a piston which should be practically fluid-tight. The present invention 5 is an improvement on Patent No. 1,898,845 and on the device disclosed in the application Serial No. 731,168.

The general object of the invention is to make the major portion of the piston of two halves with springs for pressing the halves apart and against the walls of the cylinder, a spool-like member having its top part forming the top of the piston and its-hub and lower part located between the two halves with sealing discs located between the top part of the spool. and the tops of the two halves of the body.

This invention also consists in certain other features of construction and in the combination and arrangement of several parts, to be hereinafter fully described, illustrated in the accompanying drawings and specifically pointed out in the appended claims. p

In describing the invention in detail, reference will be had to the accompanying drawings wherein like characters denote like or corresponding parts throughout the several views, and in which:

Fig. l is a fragmentary vertical sectional view through parts of a motor showing the improved.

30 piston therein, the piston being in elevation.

Fig. 2 is a section on line 2--2 of Fig. 1. Fig.3 is a section on line 33 of Fig. 1.

Fig. 4 is a view of one of the sealing blocks.

Fig. 5 is a section online 5-5 of Fig. 1.

Fig. 6 is a section on line 6-6 of Fig. 1.

. Fig. 7, is a section online '|-'I- of Fig. I.

Fig. 8 is a view looking towards the flat face of one of the sections of the body.

Fig. 9 is a top plan view of Fig. 8.

Fig. l is a top plan view of the spool.

Fig. 11 is an elevation of the spool.

Fig. 12 is a fragmentary vertical sectional view through the upper; part of the spool and the upper sealing disc.

Fig. 13 is a top plan view of one section of the lower sealing disc. I

Fig. 14 is a view looking towards the inner edge of the section shown in Fig. 13.

Fig. 15 is a top plan view. of a section of the upper disc.

Fig. lfiis a view looking towards the inner edge of the section shown in Fig. 15.

In these drawings, the letter A indicates the body of the piston which is composed of the two half sections I, each section having a pair of upper holes 2 therein and a pair of lower holes 3 therein, the holes opening out through the inner or-straight side of the sections and springs 4 are placed in these four pair of holes and act to spread the two sections apart and against the internal wall of the cylinder B and to take up wear between the body A and the cylinder. The inner or flat face of each section is also provided with a large semi-circular recess in its lower part, and a smaller bore 6 which extends from the top of the'section into the top of the recess,

these recesses and bores forming circular recesses and'bores when the two'sections are placed together. A spool S is composed of a large top disc I, a hub 8 and a smaller lower disc 9, the hub passing through the circular bore and the small disc being located in the circular recess and springs placed in vertical holes .ll vformed in the sections I, press upon the lower disc 9 and tends to press the spool downwardly, the upper ends of'the holes ll terminating short of the top of the sections I of the body A. An upper sealing disc C and a lower sealing disc D are placed between the upper disc 1 of the spool and the upper end of the body A and each of. these sealing discs is composed of the two half sections l2 .and l2"resp'ectively. These sections of the .upper. disc are arranged at right angles to the sections of the lower disc and each section of ,each disc is formed with a centrally arranged semi-circular recess [3 on its straight edge, a pair of innernotches M' and a pair of outer notches Hi, all the notches opening out through the straight edge with the outer notches 15 being of less length than the inner notches l4. Sealing 5 blocks l6 are placed in the two pairs of notches l5 and springs I! are placed in the two pairs of notches M of each disc, the springs l1 tending to force the two sections of each disc apart and against the internal wall of the cylinder to pre- 40 vent leakage between the piston and the said wall and also to compensate for wear. The blocks 16 prevent leakage through the spaces between the two sections of each disc and by arranging the discs at right angles to each other, the sections of one disc seal the gap between the sections of the other disc. The underface of the upper disc I of the 'spoolis grooved as shown at I8 to receive portions of the springs ll of .the upper disc as shown more particularly in Fig. 12. A pin l9 extends upwardly from one of the sections I of the body A and extends into the space between the two sections of the lower sealing disc D and a pin 20 is carried by one of the sections of the upper disc C and extends into the space between the sections of the lower disc D as shown in Fig. 5, the projections 2| of the one section of the lower disc D, formed by the notches l4 and I5, being slightly shortened to receive the pins as sown in Fig. l3. These pins prevent the sealing discs from turning and holds them in their respective positions.

The two sections i of the body A are provided with the bores 22 which open out into the recesses 5 and these bores are adapted to receive the ends of the wrist pin 23 to which the connecting rod 24 is connected.

Thus the piston provides a practically fluidtight means for preventing fluid from passing between itself and the cylinder wall and it will be seen that the power load as well as the compression load is converted to the sealing discs and thereby to the wrist pin through the body by the top disc 1 of the spool, the spool descending with the pressure exerted on top of the piston assembly.

This improved type of piston also compensates for wear between the piston parts and between said parts and the walls of the cylinder.

It is thought from the foregoing description that the advantages and novel features of I the invention will be readily apparent.

It is to be understood that changes may be made in the construction and in the combination and arrangement of the several parts, provided that such changes fall within the scope of the appended claims.

I claim:

1. A piston of the class described comprising a body part formed of two half sections, spring means for forcing the sections apart, a spool-like member having its hub passing betewen the two sections with its top disc formingthe top of the piston and its bottom disc operatingin a recess in the lower part of the body, a wrist pin passing through said recess, spring means tending to move the spool-like member downwardly, sectional sealing rings located between the top of the body and the upper disc of the'spool, each sealing ring being formed of two sections, the sections of the upper ring being arranged at right angles to the sections of the lower ring,

I spring means for forcing the sections of the sealing rings apart, means bridging the gap between the sections of each sealing ring.

2. A piston of the class described comprising a body part formed of two half sections, spring means for forcing the sections apart, a spoollike member having its hub passing between the two sections with its topdisc forming the top of the piston and its bottom disc operating in a 5 recessin the lower part of the body, a wrist pin passing through said recess, spring means tending to move the spool-like member downwardly, sectional sealing rings located between the top of the body and the upper disc of the spool, each 10 sealing ring being formed of two sections, the sections of the 'upper ring being arranged at right angles to the sections of the lower ring, spring means for forcing the sections of the sealing rings apart, means bridging the gap between 1 the sections of each sealing ring, and means for preventing rotary movement of the sealing rings.

3. A piston of the class described comprising a body formed of two half sections, spring means for forcing the sections away from each other, the inner face of each section having a large lower semi-circular recess therein and a smaller upper semi-circular recess, the recesses of the two sctions forming a large circular lower bore and a small circular upper bore, a spool-like 25 member including a large upper disc, a hub and a small lower disc, said disc fitting in the large circular bore and the hub passing through the small circular bore, spring means carried by the body and engaging the lower disc for forcing the spool downwardly, a wrist pin passing through the large bore, a pair of sealing discs located between the upper disc of the spool and the upper end of the body, each sealing disc being formed of two sections, spring means for forcing the sections of each disc apart, the adjacent edges of the sections of each disc having notches therein, and a centrally arranged semicircular recess, the two semi-circular recesses forming a passage for the hub of the spool and the sections of one disc being arranged at right angles to the sections of the other disc, the spring means being arranged in certain of the notches, sealing means located in the other notches and bridging the space between the sections of each I sealing disc, a pin carried by the body and extending into the space between the sections of the lower sealing disc, a pin carried by the upper sealing disc and extending into the space between the sections of the lower disc.

STEPHEN E. MEYER.

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