Molded plastic air cylinder

Patent 4898082 Issued on February 6, 1990. Estimated Expiration Date:

September 12, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3040712

3176595

3913460

Piston pump
Patent #: 4009645
Issued on: 03/01/1977
Inventor: Freimuth

Piston fluid seal mounting
Patent #: 4195849
Issued on: 04/01/1980
Inventor: Taft

Plastic air cylinder assembly
Patent #: 4207807
Issued on: 06/17/1980
Inventor: Takata , et al.

Work cylinder having a piston member with an integral cushioning arrangement
Patent #: 4651623
Issued on: 03/24/1987
Inventor: Rogers

Re-chargeable servo cylinder Patent #: 4667780
Issued on: 05/26/1987
Inventor: Pauliukonis

Inventor

Pottorff, Earl T.

Application

No. 242528 filed on 09/12/1988

US Classes:

92/132, Tension spring92/85A, Metal spring92/130R, WITH SEPARATE BIASING MEANS FOR WORKING MEMBER92/169.1, CYLINDER DETAIL92/170.1, Nonmetallic piston contacting portion92/248, Nonmetallic portion92/249, Flexible277/436, Piston ring having peripheral radially sealing flexible projection (e.g., piston cup, etc.)277/565On radial facing side of single seal

Examiners

Primary: Garrett, Robert E.
Assistant: Denion, Thomas

Attorney, Agent or Firm

Wall and Roehrig

Foreign Patent References

1173764 FR 03/13/2012
644719 IT 09/13/1962

International Class

F01B 031/00

Abstract

A plastic pneumatic cylinder has a cylinder housing, a piston within the housing, and a rod on which the piston is mounted. The cylinder is molded of a plastic synthetic resin and has a cylindrical bore of a predetermined diameter. The piston is molded in one piece from plastic synthetic resin, such as Delrin, in the form of a generally cylindrical body and a generally cylindrical sealing lip surronding and spaced radially from the body to seal slidably against the bore. The lip is flared out somewhat to have an edge that is of a greater diameter than the bore. The piston can be formed in single-acting or double-acting configurations. A conical return spring can be employed.