Title: Control device for forward-reverse transmission gears

Abstract: Pressure fluid control for a transmission. There is provided a pressure fluid control device for a transmission, particularly applicable to use in fork lift trucks, wherein a suitable hydraulic selector receives pressure medium from a pressure creating device such as a pump and directs same through a pressure regulating valve to a selected one of the transmission clutches or couplings. Particularly the pressure regulating valve is arranged in a rotary slide valve of the hydraulic selector and is arranged to respond to a piston energized by brake pressure fluid. Thus by the use of very simple apparatus the first portion of a brake pedal movement is utilized to disengage a transmission.

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Other info:

Inventors: Hubl, Julius (Munich, DT)
Parzl, Franz (Munich, DT)

Application Number: 505838
Filing Date: 1974-09-13
Publication_date: 1977-05-31
Assignee: Carl Hurth, Maschinen- und Zahnradfabrik (Munich, DT)
Primary Class(es): 192/220.1 137/614.17, 137/637.4, 192/221
Other Classes:
US Patent Ref:

2700985	Feb, 1955	Gleasman	137/614.
3007347	Nov, 1961	Gendron et al.	192/109.
3042165	Jul, 1962	Yokel	192/109.
3143127	Aug, 1964	Frost	192/4.
3213888	Oct, 1965	Cameron et al.	137/637.
3613844	Oct, 1971	Asano et al.	192/4.
3752281	Aug, 1973	Arnold	192/87.
3823801	Jul, 1974	Arnold	192/109.
3850273	Nov, 1974	Murakami	192/109.

Other Refs:
Primary Examiner: Wyche, Benjamin W.
Assistant Examiner:
Attorney: Woodhams, Blanchard and Flynn