US1524715A

US1524715A - Ringless piston

Info

Publication number: US1524715A
Application number: US648772A
Authority: US
Inventors: Klatzke William
Original assignee: Individual
Current assignee: Individual
Priority date: 1923-06-30
Filing date: 1923-06-30
Publication date: 1925-02-03
Anticipated expiration: 1942-02-03

Description

w. KLATZKE RINGLESS PISTON Filed June 30, 1923 BY if I ATTORNEY.

Patented eb. 3, 1925.

UNITED STATES WILLIAM KLATZKE, OF DETROIT, MIQHIGAN.

RINGLESS PISTON.

Application filed June 30, 1923. Serial No. 648,772.

To all whomit may concern:

Be it-known that I, lVILLIAM KLA'rzKE, a citizen of the United States, and residing at Detroit, county of WVayne, and State of Michigan, have invented a new and Improved Ringless Piston, of which the following is a specification.

This invention relates to pistons for internal combustion. engines, and has for its primary object the provision of a one-piece piston operable without the use of piston rings or other separable packing to closely press against the cylinder wall and prevent the leakage of the combustible gas around 16 the piston during the operation of the/engine. I

Another object of the invention is the construction of an integral piston of substantially barrel shape wit-h a solid reinforced 20 head portion of slightly lesser diameter than the cylinder and a slotted body portion arranged with its waist of a diameter greater than the cylinder and then gradually tapering to its foot, which is: of slightly lesser diameter than the cylinder.

A further object of the invention is the arrangement of a simple, light and easily formed piston which may be cast of any desired metal or alloy and quickly machined and slotted to snugly fit within the cylinder,

- the slots being arranged to permit auto matic adjustment of the piston under varying temperature conditions.

The above and otherobjects will be apparent from the following description wherein reference is made to the accompanying drawings illustrating a preferred embodiment of the invention, and wherein similar reference numerals designate simi- 40 lar parts throughout the several views.

In the drawings, Fig. l is a perspective View of my improved piston.

' Fig. 2 is a central horizontal section through the connection with the wrist pin of the connecting rod, and

Fig. 3 is a central vertical section taken substantially on the line 33 of Fig. 2 but with the wrist pin and connecting rod removed.

In the drawings, numeral 5 designates the head portion of the piston which, best shown in Fig. 3, is ofasubstantial thickness and reinforced with ribs 6, herein shown as projecting radially from a central hub 7 arranged below the centering notch 8 wherefrom the piston is machined. The outer diaineter of the piston gradually tapers from the head portion 5 to the waist 9 which is preferably of a diameter-.004 to .005 greater than the diameter of the cylinder wall. The waist portion J is arranged substantially centrally of the longitudinal axis of the piston. From such waist the piston tapers in both directions, the head portion and foot portion 10 being both of substantially .002 smaller than the bore of the cylinder. m

The piston is preferably cast in one-piece from grey iron or the like, though any desired metal or alloy can be used. It is not necessary however that tempered steel or the like he usedfor resiliency, as the shape of the piston coupledwith the arrangement of slots presently to be described give to practically all metals adapted for use as pistons a sufficient resiliency. The body ortion of the piston is slotted longitudinally with a plurality of spaced slots 11- open at 'the foot portion 10 and extending to the ribbed portion of the head 5. (See Fig. 3.) The portion of the slots 11 below the waist of the piston is wider than that above the waist by .001 or .002 inch. The portions between adjacent slots 11 are adapted to move toward and away from each other when the piston is inserted into the cylinder bore, the enlarged waist portion 9 engaging the cylinder wall and forcing the movable foot portions inwardly until the piston snugly fits within the cylinder. The solid head portion 5 is accordingly backed by a resilient body portion with its center engaging the cylinder wall and gralually tapering therefrom to the foot portion which is clear of the cylinder. The piston. thus rides with its center or waist portion 9 in contact with the cylinder wall and is under tension suflicient to maintain this engagement at all times, whether the cylinder is cold or heated. One or more circumferential grooves 12 may be provided in the periphery of the piston adj acent the waist portion 9 to collect oil and aid in forming the oil-seal during the operation of the engine. Excess oil'may escape tothe interior of the piston through holes 13.

The piston is secured to the connecting rod 14 by means that permit the expansion and contraction of the piston relatively to the connecting rod. In the illustrated embodiment I have provided a pair of bosses 15 integrally formed with the piston and adapted to receive the wrist pin 16, which is of slightly lesser diameter than the bore of the bosses. One extremity of the wrist pin is securely fastened to one of the bosses by means of the stud 17 or the like, While the opposite end of the wrist pin is free, permitting movement of the piston walls relatively thereto during the expansion and contraction. A bearing 18 carried by the connecting rod 14 surrounds the central portion of the wrist pin in the usual manner.

mlile it will be apparent that the illustrated embodiments of my invention herein disclosed are well calculated to adequately fulfill the object and advantages primarily stated, it is to be understood that the inven-- tion is susceptible to variation, modification and change within the spirit and scope of the subjoined claim.

v claim Having described my invention, ll

Ell) A piston formed integrally with head and foot portions of lesser diameter than the cylinder bore and a central waist portion of greater diameter than the cylinder bore and having a circumferential oil receiving groove in its periphe the waist and foot portions being provi ed with a plurality of spaced slots extending longitudinally of the piston and open at their lower ends. h I15i Witness whereof I hereunto set my W an I WILLIAM KLATZKEY.

lVitnesses:

Mrs. PHEBE B. FISCHER, GEORGE HERTEL.