US1373989A - Piston construction - Google Patents

Description

B L. WOODLAND.

PISTON CONSTRUCTION- APPLICATION FILED 0509 ms.

Patented Apr. 5, 1921.

:Beza Z 1 4/26? gnven ro'c BERT L. WOODLAND, or M SKEG N, MICHIGAN. I 5

rrsToN CONSTRUCTION.

Specification of Letters Patent.

Application filed December 9, 1918; Serial No. 2 65,955..

To all whom it may concern Be it known that I, BERT L. WOODLAND,

a citizen of the United States, residing at Muskegon, in the county of Muskegon and mentioned character the construction of which is novel and is designed to prevent the oil from working up around the piston rings and causing carbon to form on the top of the piston heads proper in any gas engine and in addition maintains an effective and tight relation between the rings and the walls of the cylinder at all times.

More particularly the present invention contemplates the provision of a device of the above mentioned character wherein the piston is composed of a head and an expansible ring carrying collar removably fitted in the head and designed to produce an outward pressure against the inner sides or surfaces of the rings producing in effect an airtight engagement between the piston and the cylinder walls.

Among the other aims and objects of the present invention may be recited the provision of a device of the above mentioned character wherein'the number of parts are comparatively few, the construction simple, the cost of production low and the efiiciency high.

Other objects as well as the nature, characteristic features and scope of this invention will be more readily apparent from the following description t-aken in connection with the accompanying drawings and pointed out in the claim, forming a part of this specification.

The invention is clearly illustrated in the accompanying drawings, in which:

Figure 1 is a side elevation of the improved construction, the rings being shown in section, V e

Fig. 2 is a transverse section taken on line 2-2 of Fig. 1,

Fig. 3 is afragmentary longitudinal sec- Patented A t. 5.1921.

tional View showing the relation between the head and band or collar, and

Fi .4 is a" ers ective detail of one of the .z: P P ends ad acentthe split 1n the band or collar.-

Similar characters of reference are employed in all of the above described views, to indicate corresponding parts. 7

Referring now, more particularly, to the accompanyingdrawings, there is provided the improved piston constructlonwhich 1n the present instance may be saidto consist of a cylindrical sklrt 1, the outer surface of WlllCh is provided with an annularigroove 2, desirably positioned nearthe closed outer end of the head. V

vltemovably fitted in the groove 2'is an expansible collar or band 3 provided. with a split 4 and the meeting ends of the collar are compleinentally beveled as at 5 so that the said meeting ends will lie in overlapping relation when the collar is fitted in position on the head. In order to prevent passage of oil, gases, etc., through the split, a lug 6 projects from one end of the collar near the inner side edge and has the outer face 7 beveled to coiiperate with the correspondingly beveled face of the recess 8 in the opposite meeting edge of the collar, (while the inner edge of this recess cooperates with the adjacent edge of the lug to insure of the provision of an eifective joint between the meeting edges of the collar, as is apparent. In addition, the collar is provided in its outer surface with a plurality of spaced annular grooves 9 in which are removably fitted packingrings 10 of the split eXpansib-le type.

In use,.when the collar 3 is fitted in the piston head and the rings 10 are placed in the grooves 9 and the piston head in turn 7 arranged in a. cylinder, the collar or band .3 willcompress slightly at the split 4 and thereby exert an outward pressure against the inner sidesofthe rings 10. As a result therefore of the use of the present piston construction carbon is prevented from accumulating onthe top or outer end of the piston head in'a gas engine and in addition insures of the tight engagement at all times between the piston and the walls of the cylinder. c 4

It is believed in viewof the foregoing description, that a'further' detailed description of the operation of the inventionis entirely unnecessary. Likewise it is believed that the advantages of the invention will be readily apparent. I

Still further embodiments of the invention than those herein especially defined may be resorted to as conditions or preference may dictate, as may be in keeping'with the hereto appended claim.

Having thus fully described the invention, what is claimed as new and'desired to'be secured by Letters Patent, is:

In a piston construction a cylindrical body having an annular groove in its outer face,

a transversely split expansible collar seated in saic groove and substantially flush with the outer wall of said body, the side edges of the groove and collar adjacent to'each other being parallel with one another; the

ends of the collar being correspondinglyv having pressure exerted outwardly against 7 the same by said collar. a

in testimony whereof, I afiix my si nature hereto.

BERT L. WOODLAND.

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