The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 02, 1997
Filed:
Jan. 17, 1996
Udo Sonntag, Kamp-Lintfort, DE;
Imi Norgren GmbH, Alpen/Niederrhein, DE;
Abstract
A rodless pneumatic cylinder includes main exhaust ports defined by the open ends of a pair of fixed tubular members that extend, respectively, into the cylinder body from its opposed ends. The main piston of the rodless cylinder has an axial bore formed in it in which is slidably mounted a small piston that serves mutually to isolate the working chambers of the cylinder. The bore carries seals adjacent to its opposed ends whereby, during motion of the piston, the bore sealingly receives one or other of the tubular members at a predetermined stage during the motion thereby effectively closing the main exhaust port. During further motion of the piston, air can, therefore, exhaust only through a throttled auxiliary exhaust port and such further motion of the piston is thus cushioned. The arrangement provides for a greater extent of cushioning relative to known arrangements in which the working chambers are mutually isolated by a barrier fixedly secured in the bore.