US1474354A

US1474354A - Piston

Info

Publication number: US1474354A
Application number: US613386A
Authority: US
Inventors: Aldo M Franchi
Original assignee: FRANCHI RINGLESS PISTON CORP
Current assignee: FRANCHI RINGLESS PISTON Corp
Priority date: 1923-01-18
Filing date: 1923-01-18
Publication date: 1923-11-20
Anticipated expiration: 1940-11-20

Description

A. M. FRANCHI PISTON Filed Jan. 18, 1923 fi MIMI Ill I I v I INVENTOR illfllnlm I fimba ATTORNEY Patented Nov. 2d, 1923.

nano is. ransom, or new roan, n. Y., nssren'oa ro ama es: nrnennss rrsron conronnrron, or new roan, n. Y., A conronn'rron or new roan".

PISTON.

Application filed l'anuary 18, 1923. Serial Etc. 613,388.

To all whom it may concern Be it known that 1', Anne M. l nnnom, a citizen of the UnitedStates, and resident of the city of New York, iii the county of New York and State of New York, have invented certain new and useful. Improvements in Pistons, of which the following is a specification.

The present invention relates to improvements in pistons, and more particularly to trunkpistons, especially designed for use with internal combustiorr engines.

The inain object of the invention isto provide a simple, inexpensive and durable piston rod connection, wherein wearing of the elements is compensated, lost motion of the piston being thus precluded.

With these and other objects in View, which will more fully appear as the nature of the invention is betterunderstood, the same consists in the combination, arrangement and construction of parts hereinafter described; pointed out in the appended claims and illustrated in the accompanying drawings, it being understood that many changes may be made in the size and proportion of theseveral parts and details of construction within thescope of the appended claims, without departing from the spirit or sacrificing any of the advantages of the invention.

Une of the many possible embodiments I of the invention is illustrated in the accompanying drawings, in which Figure 1 is a central vertical section taken vthrough a piston constructed in accordance with the present invention; Fig. 2 is atop plan view of one of the elements of the piston rod connecting. means; Fig.3 is a front elevation oi the said element; and Fig. i is atop plan view of a spring element co-operzaing with the element shownin Figs. 2 an 3.

In the drawings, the numeral 10 indicates a trunk piston, including acylindrical shell lil which is open at one of its ends and closed at its oppositeend by a head 12.

From this head extends centrally downwards into the shell a-hollow boss 13, strengthened by ribs 15 and provided with reduced cylindrical enteriorly screw threaded lower portion 16. threads of this portion mesh the interior threads of a sleeve 17, which is provided upon its free lower end withan inwardly 24 is split to allow of extending annular shoulder 18. In the boss 13 is formed, above its screw-threaded por-' tion', an interior annular shoulder 19, against which abuts a bearing cup 20, with which co-operates a ring-shaped bearing member 21. llhecup and this hearing member constitute a spherical socket into which is fitted the spherical head 22 of a piston rod 23. The bearing member 21 is shiftably mounted in the sleeve 17, it being substantially wedgeshaped, its underface extending in a plane at an angle to the longitudinal axis of the piston shell. With this wedge-shaped hearing member co-operates a split ring 24, which rests upon the annular shoulder-18 of the sleeve 17. it being adapted to slide on the said shoulder laterally. This split ring is also wedge-shaped, its upper face bearing against the lower face of the bearing member21 throughout its entire area. From the foregoing and from an inspection of Fig. 1 of the drawings it. appears that the bearingl member 21 and the split ring 24 taper in opposite directions; whereby, when the split ring 24!: is shifted laterally in the direction of the arrow shown in Fig. 1

of the drawings, the bearingmember 21 is in contact with the underface of the bearingv member 21, there is a spring 25 provided.

This spring is made in the form of an open ring, encircling the sleeve 17. One of the ends of this ring, denoted by thenumeral 2'6,is bent inwards toward the center of the ring and extends through a slot 27. in the sleeve 17 into a recess2'8 in the split ring 24:. This recess is formed in the thickest portion of the split ring, as clearly appears from 1F igs. l and 3. of the drawings. The ring a proper assembling of the elements. I

The upper end of the sleeve 1? is pro videdwith a flaring skirt 29, in which oil collects as the piston is operated in its cylfinder. Theoil flows from this skirt through the re istering apertures 30and 31 in the re duced portion. 16 of-fthe boss 13 and the bearing cup 20, respectively, and through a bore 32 in the said bearing cup to the With the spherical head 22 of the piston rod, whereby proper lubrication of the bearing cup,

bearing member21 spherical head 22 of the piston rod 15 obtained.

the piston, to compensate for the wear.

Lost motion of the elements is thus pre-' vented. It is to be noted that the spring at the same timepreventsturning of the bearing member 21.

What I claim is r x 1. The combination with a trunk piston having a boss projecting downwards from its head into its shell provided with a cylindrical portion having exterior screw-threads, of a sleeve having interior screw-threads meshing with thoseof said cylindrical portion provided at its free end with an annular inwardly projecting shoulder, aspherical socket comprising a stationary member within said cylindrical portion anda movable member Within said sleeve, a piston rod projecting into said sleeve having a spherical head seated in said socket, the movablemember of said socket being Wedge-shaped and shiftable Within said sleeve in the direction of the longitudinal axis of saidpiston shell, a wedge-shaped ring shittable latorally on said shoulder and abutting against said-movable socket member, said sleeve being provided with a slot in alignment with I a recess in said ring, and a ring-shaped spring surrounding said sleeve having spaced apart ends, one of said ends being bent radially inwards and extending through said slot into said recess to shift said ring laterally so as to cause movement of said movable socket member in the direction of the longitudinal axis of'said sleeve, whereby Wear of said socket members and the spherical head within said sleeve and abutting against said movable socket member, and a ring-shaped spring surrounding said sleeve having spaced apart ends, one of said ends being bent radially inwards and extending through said sleeve into engagement. with said laterally movablemember to shift the latter laterally so as to cause movement of said movable socket member in the direction of the longitudinal 'axis of said sleeve.

Si ned at New York, in the county of New ork and State of New York, this 18th day of October, A. D. 1922.

ALDO iu. FRANoHi.