Title: Hole sensing device for spike driver

Abstract: A hole sensing device for a spike driving machine is disclosed. The sensing device has two projecting fingers both of which ride along the surface of a tie plate as the sensing device is swept along parallel to the rails. The fingers actuate two switches one open and the other closed when the fingers are not contacting the tie plate. When the fingers are both engaging the tie plate the switch associated with the leading finger is open and the other closed. As soon as the leading finger registers with a hole it closes its associated switch completing the circuit and allowing a hole sensing signal to be sent.

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Inventors: Newman, George R. (Lexington, SC, US)

Application Number: 779636
Filing Date: 1977-03-21
Publication_date: 1979-05-01
Assignee: Canron, Inc. (New York, NY)
Primary Class(es): 200/61.42 104/17.1, 227/2
Other Classes:
US Patent Ref:

2144858	Jan, 1939	Smith	200/61.
3339040	Aug, 1967	Vilkas	200/61.
3577955	May, 1971	Palmer	116/114.
3753404	Aug, 1973	Bryan	104/17.
3753405	Aug, 1973	Bryan	104/17.
4019003	Apr, 1977	Duerksen	200/61.

Other Refs: 1315122149708

Dec, 1962	FR
Sep, 1961	SU

Primary Examiner: Sheridan, Robert G.
Assistant Examiner: Weaver, Ross
Attorney: Wenderoth, Lind & Ponack