Claims
- 1. An input apparatus comprising:
- a control section,
- a body formed with a pump passage and an output port,
- push rods arranged in said body and operatively connected to said control section,
- elastic means arranged in said body and operatively connected to each of said push rods,
- a shuttle arranged in said body and operatively connected to an individual one of said push rods,
- said shuttle having a pressure receiving surface and being formed with a passage,
- pressing operation of said control section causing said shuttle to be moved through said individual one of said push rods in a one direction against said elastic means to communicate said shuttle passage with said pump passage of said body, resulting in feeding hydraulic oil from a hydraulic pump through said shuttle to said output port of said body and balancing a back pressure acting on said pressure receiving surface of said shuttle through said output port with elastic force of said elastic means to determine a position of said shuttle and a hydraulic pressure output through said output port depending on the amount of operation of said control section, and
- said body including a pilot section having a hydraulic signal passage communicating with said shuttle pressure receiving surface through which an external hydraulic signal can be fed to exert a force on said shuttle pressure receiving surface to move said shuttle in a second direction opposing said one direction against said elastic means and therewith provide a control of a hydraulic pressure output through said output port counteractive to that otherwise determined by a position of said individual one of said push rods.
- 2. An input apparatus as defined in claim 1, wherein said input apparatus is in the form of a pilot valve.
Parent Case Info
This is a divisional of co-pending application Ser. No. 07/875,642 filed on Apr. 29, 1992, now U.S. Pat. No. 5,251,534.
US Referenced Citations (4)
Divisions (1)
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Number |
Date |
Country |
Parent |
875642 |
Apr 1992 |
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