The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 26, 1982
Filed:
Jan. 25, 1980
Applicant:
Inventors:
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E01B / ;
U.S. Cl.
CPC ...
104 12 ; 104 / ;
Abstract
A control arrangement for operating the hydraulic drive and for monitoring the vertical movement and a corresponding immersion depth of the tamping tools in the ballast of a tamping unit includes a hydraulic fluid control circuit connected to the hydraulic drive for the unit, a control valve in the control circuit, the valve being capable of steplessly adjusting hydraulic fluid flow to the drive, and a control connected to the valve for adjustment thereof. The control has a first signal transmitter providing a control signal indicating the actual vertical position of the tamping unit and a second signal transmitter providing another control signal indicating a desired immersion depth of the tamping tools in the ballast.