US1222413A - Piston. - Google Patents

Description

I. T. KING.

PISTON.

I APPLICATION men JUNEZI. ms.

L m $0 Patemyedl Apr. 10, 191?.

En 15 IFZ 1- 7 l 15 m g g j M Q rm mm JES El. KING; 0F HIGHLAND PARK, MICHIGAN.

PISTON.

t eatre,

Specification of Letters Patent.

Patented Apr, 1(0), llt lil'ifo Application filed June 21, 1916. Serial No. 104,975.

To all witom it may concern.

Be it known that I, JAMES T. KING, a subject of the King of England, and a resldent of Highland Park, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements inPistons, of which the following is a speclfication.

My invention relates to pistons for gas, steam, or other engines, pumps, compressors, etc., and the main object is to provide a selfpacking piston to replace the type known as ring pistons, whereby the greatly sought for lightness in pistons is assured.

My invention is fully described 1n the following specification, of whlch the accompanying drawings form a part, m which like characters refer to like parts in each of the views, and in which 2-- Figure 1 is an elevation of a piston constructed in accordance with my lnventlon;

Fig. 2 is a top plan view thereof;

Fig. 3 is a section taken on the line 3-3 of Fig. l; a

Fig. t is a section taken on the line H of Fig. 3; and Fig. dis a detached, fragmentary, view of my packing sleeve.

Referring to the drawings, 6 represents a shell closed at its top, as shown at 7, and of slightly less diameter for a desired portion of its upper end, as shown at 8, a plate or suitable equivalent 9 being secured in any desired manner in the shell to serve as a support for a wrist-pin 10, said plate having an opening 11 therein for the connectingrod, not shown,

Welded or otherwise secured to the outer surface of the lower portion 12 of the shell 6 is a sleeve 13 of an external diameter ap proximating that of the cylinder for which the piston is designed and the lower portion of which may be provided with oil grooves 14: of desired number and character, and the sleeve 13 is preferably extended slightly above the crown 7 and terminated at the lower end of the shell 6, the crown 7 being illustrated as convex at the top of the piston.

By reference to Figs. 2, 3 and 4:, it will be noted that the sleeve 13 is separated for the greater portion of its circumference from. the shell portion 8 whereby space is pro vided for a plurality of peripheral depressions l5 formd in the outer surface of the sleeve and shown as at diametrically opposite points, the sleeve being'formed of two independent leaf members 16 and 17 for a desired distance from the top downwardly and the former of which is so recessed, whereas the latter is dentated to provide tongues 18 resting in the respective recesses 15, preferably with a compression fit.

lhe upper portion of the sleeve may be exactly the same diameter as the cylinder for which the piston is designed, or it may be made slightly greater and require compression to install the piston in the cylinder, this being optional, and when the piston is driven downwardly on its working stroke the motive fluid will tend to expand the leaf members 16 and 17 into close engagement with the walls of the cylinder and thus prevent'leakage, the tongues being slidable in the respective depressions.

The sleeve 13 may be made of very thin material and still be of maximum efliciency, the shell 6 being made of a weight suficient for the estimated stresses, whereby a very light piston results and, as hereinbefore stated, self-packing and thereby dispensing with the piston rings now in common use, particularly in internal combustion engines.

While I have shown a preferred embodiment of the invention, it will be understood that l do not limit myself to any specific details other than the independent upper sleeve members capable of relative movement, with the depressions'and tongues tending to prevent leakage past the piston, and will be understood that the depressions are of a depth equaling the thickness of the tongues whereby a substantially unbroken surface continuity results of the upper portion of the piston where it contacts with the cylinder walls.

While not shown, l may deepen these dc pressions and arrange asbestos shims therein to assist in the desired result, but this optional and forms no part of the invention.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

l. A piston, comprising a shell and a sleeve thereover, a portion of said sleeve being formed of overlapping leaf members presenting a substantially unbroken surface continuous to the walls of a cylinder and expanding into close contact with said walls. 2. A piston, comprising a shell and sleeve thereover, a portion of said sleeve be ing formed of independent leaf members, one of which is dentated to form tongues and the other of which is recessed to receive ill lift

the respective tongues, to present a smooth ametei' at its top than at its bottom, and a outer surface to the walls of a cylinder. sleeve fitted on said shell at its larger diam- 3. A piston comprising a cylindrical memeter and encircling said shell at its lesser her having overlapping leaf members for diameter though removed therefrom, said 15 5 a portion of its length, one of said leaf sleeve being formed at its top of overlapping members being dentated to form tongues leaf members one of which is dentated to V and the other of said leaf members being reform tongues and the other of which is recessed to receive the respective tongues, to cessed to receive the respective tongues, present a smooth exterior to the walls of a whereby said sleeve presents a smooth exte 20 10 cylinder. rior to the walls of a cylinder.

4. A piston, comprising a shell of less di- JAMES T. KING.

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