Method of and arrangement for controlling the speed of the movem

Details Method of and arrangement for controlling the speed of the movem Method of and arrangement for controlling the speed of the movem

1974-10-18

1976-08-10

Foss, J. Franklin

Supports

Pipe or cable

Extending through plate

173 43, E21C 511, E21C 900, E21C 1100

Patent

active

039737470

ABSTRACT:
A method of and arrangement for controlling the speed of the movements of hydraulic booms and of members attached thereto, wherein the movements are performed by hydraulic motors and the return flow from the motors is throttled in one or more steps for adjusting the speed in a stepwise manner. The invention may to advantage be used for controlling the movements of a supporting member for a rock drilling machine, such as a boom or a feed bar, whereby the supporting member is moved by a pressure fluid actuated cylinder and the return flow from the cylinder is throttled in the above manner.

REFERENCES:
patent: 2940263 (1960-06-01), Cudnohvesky
patent: 3164065 (1965-01-01), Frantz
patent: 3253613 (1966-05-01), Richolt
patent: 3273468 (1966-09-01), Allen
patent: 3363514 (1968-01-01), Ramcke
patent: 3426799 (1969-02-01), Kintner
patent: 3481409 (1969-12-01), Westerlund
patent: 3523490 (1970-08-01), Bianchetta
patent: 3558102 (1971-01-01), Cruse
patent: 3700396 (1972-10-01), Adams
patent: 3851566 (1974-12-01), Herrman

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