Claims
- 1. A piston assembly adapted to cooperate with a cylinder comprising:
- a. a cylindrical base member having a substantially flat surface and a vertical, circular outer surface in proximity to and parallel to said cylinder;
- b. a centrally located circular stud means extending at right angles from the substantially flat horizontal surface to said base member;
- c. a cylindrical top piston assembly part having an outer diameter substantially equal to the diameter of said base member and a hollow cylindrical part in fitting relationship with said stud means, a substantially flat surface extending from said stud and positioned in parallel relationship with said flat surface of said base member surface of said base member;
- d. inclined surfaces on said base and said top part extending at an acute angle between said cylindrical surfaces and said flat surfaces, such inclined surface being parallel.
- e. at least one thin, flexible, circular, film-like disk member having an outer diameter substantially greater than the diameter of said base member and said top piston assembly part, a circular aperature in the center thereof having a diameter greater than said stud member, said stud member being adapted to fit within said aperature;
- f. a plurality of substantially evenly spaced radial, inwardly extending slits in said film-like member forming a plurality of substantially equal film sections;
- g. means positioning at least one film-like disk member between said base member and said top piston assembly member so that said film-like member engages said substantially flat surfaces and extends downwardly adjacent to said inclined surfaces whereby said film sections overlap to trap air between the overlapping sections, a portion of said disk-like member adapted to engage vertical surface when the piston and cylinder are in operating position.
- 2. A piston assembly as defined in claim 1 having
- a. a circular intermediate member positioned between said base member and said top member having a diameter substantially equal to said base and said top member and having a circular opening therein adapted to fit over said stud member;
- b. said intermediate member having upper and lower substantially flat surfaces terminating in downwardly extending inclined surfaces parallel to said downwardly inclined surfaces on said base member and said top member;
- c. at least two of said film-like members, a first film-like member being positioned between said top piston assembly and said intermediate assembly, a second film-like member positioned between said intermediate assembly and said base member.
Parent Case Info
This is a division of application Ser. No. 375,298, filed May 5, 1982, now U.S. Pat No. 4,499,905.
US Referenced Citations (4)
Foreign Referenced Citations (1)
Number |
Date |
Country |
123351 |
Feb 1919 |
GBX |
Divisions (1)
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Number |
Date |
Country |
Parent |
375298 |
May 1982 |
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