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Patent Searching and Data


Title:
DIRECTIONAL VALVE DEVICE FOR LOCATING MACHINE UNIT
Document Type and Number:
Japanese Patent JPS548285
Kind Code:
A
Abstract:
A servo system is presented for controlling the angular attitude of machine units pivotally mounted on an outlying boom frame. Said system is applicable to rock drilling machines, breakers, loading scoops and forks, working platforms, manipulator booms, and the like. The system includes a directional control valve for governing the positioning motor of the machine unit. Under full working pressure the directional valve in itself provides automatic attitude control of the machine unit. To this end the directional valve is provided with a feedback position, in which the pressure fluid communications to the positioning motor are cut off and furthermore has a syngonous (uniangular) relationship on the one hand to the actual angle value of the machine unit with one of its valve elements and on the other to a selective set angle value with its other valve element.

Inventors:
AREKISU MORIN
Application Number:
JP7432378A
Publication Date:
January 22, 1979
Filing Date:
June 21, 1978
Export Citation:
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Assignee:
ATLAS COPCO AB
International Classes:
E21B7/02; E21B15/04; F15B9/08; F15B7/00; F15B9/10; (IPC1-7): F15B7/00; F15B9/08