Title: Inching valve

Abstract: In a control apparatus, for a vehicle having a transmission and brake means wherein hydraulic passage means connects a source of fluid pressure to a fluid actuated clutch, an improved inching valve interposed in said passage means for selectively reducing the hydraulic pressure supplied to the clutch in proportion to the degree of actuation of the brake means in two successive stages wherein there is no direct initial mechanical connection between the inching valve spool and its actuating means whereby in the first stage of operation the solely hydraulical connection between the actuating means and the spool member positively restricts the operation of the improved inching valve to pressures below the maximum desired clutch slip pressure and wherein during the second stage of operation, the clutch pressure is further reduced to a minimum slip pressure.

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Inventors: Patton, Jon R. (Jackson, MI, US)

Application Number: 821277
Filing Date: 1977-08-03
Publication_date: 1979-04-24
Assignee: Clark Equipment Company (Buchanan, MI)
Primary Class(es): 192/13R 137/116.3, 137/495, 137/625.61, 192/109F
Other Classes:
US Patent Ref:

3143127	Sep, 1964	Frost	137/116.
3339672	Oct, 1967	Crandall	192/13.
3365035	Jan, 1968	Kress	192/109.
3568718	Mar, 1971	Wilke et al.	137/625.
3696897	Oct, 1972	Kitano et al.	192/109.
3990549	Nov, 1976	Sisson et al.	192/4.
4006805	Feb, 1977	Zeller et al.	192/4.

Other Refs:
Primary Examiner: Scott, Samuel
Assistant Examiner: Yates, James
Attorney: Ruf; Ernst H.