Title:
TRACK TENSIONER
Document Type and Number:
WIPO Patent Application WO/2016/176627
Kind Code:
A3
Abstract:
Valve assemblies (320; 420) are provided in a track tensioning system or in other applications. The valve assemblies allow pressurized fluid (grease or hydraulic fluid from a power machine) to be introduced or evacuated from the same port. The valve assemblies use either a single check ball or poppet configuration, or a dual check ball or poppet configuration which are moveable from a first configuration, in which fluid is blocked in one direction while allowing flow in the other direction, to a second configuration where the reverse is true. A track tensioning element (300; 400; 600) includes piston retaining features (515; 550) which retain a piston (505) within a track tensioning cylinder tube (510). A track tensioning element can also include a no-pre-load spring (605) positioned in-line with the tensioning cylinder (610). Disclosed track tensioning systems and track tensioning elements can, in various embodiments, utilize any combination of all or some of the disclosed features.
Inventors:
TOKACH THOMAS J (US)
COOMBS JASON R (US)
COOMBS JASON R (US)
Application Number:
PCT/US2016/030217
Publication Date:
January 26, 2017
Filing Date:
April 29, 2016
Export Citation:
Assignee:
CLARK EQUIPMENT CO (US)
International Classes:
B62D55/30; F15B15/20; F15B15/26; F16K1/14; F16K15/04
Foreign References:
| US4314592A | 1982-02-09 | |||
| US3605808A | 1971-09-20 | |||
| EP0930227A2 | 1999-07-21 | |||
| JP2001032803A | 2001-02-06 | |||
| EP1647722A1 | 2006-04-19 | |||
| US2839032A | 1958-06-17 | |||
| US4681376A | 1987-07-21 | |||
| US3645586A | 1972-02-29 | |||
| US4726631A | 1988-02-23 | |||
| US3647270A | 1972-03-07 | |||
| US20120062025A1 | 2012-03-15 |
Attorney, Agent or Firm:
VELDHUIS-KROEZE, John et al. (US)
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