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:
Mar. 17, 1981
Filed:
Jun. 15, 1978
Applicant:
Inventor:
Andrew M Dieringer, Waterford, WI (US);
Assignee:
Rexnord Inc., Milwaukee, WI (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E01B / ;
U.S. Cl.
CPC ...
104 / ; 104 / ; 307115 ; 338-2 ;
Abstract
In a railroad spike driving machine, the spike driving mechanism is centered over a spike by a system which provides simultaneous proportional control over both the vertical and horizontal positions of the spike driver. The driver is mounted on a carriage whose position is adjustable according to signals derived from the deflection of a control arm. Strain gauges mounted on the control arm sense the push or pull of the operator to adjust the carriage position. The speed of the drive stroke of the hydraulic spike driver is governed by a proportional control valve which is in turn controlled by a signal generated from a trigger switch on the control arm.