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:
May. 06, 2003
Filed:
Nov. 06, 2000
Yoshiaki Nakaya, Kobe, JP;
Tsutomu Togashi, Kobe, JP;
Masahiko Okuda, Kobe, JP;
Norio Shiraishi, Kobe, JP;
Nabco Limited, Hyogo-ken, JP;
Abstract
There is provided an air-cylinder apparatus for use in a prosthetic limb capable of effectively adjusting the pressure characteristics over a wide range of walking speed. A second chamber defined by a piston is increased in pressure by air confined therein in accordance with the bending motion of the knee. Air is restricted from flowing out of the second chamber by a constant throttle valve In addition, the second chamber is divided into plural chambers in accordance with increase in bending angle of the knee and air is restricted from flowing out of the newly divided chambers by throttle valves corresponding thereto. The division of the second chamber is achieved by mutual engagement between a projection on the piston side and a recess on the bottom part of a cylinder body.