Hole sensing device for spike driver

Details Hole sensing device for spike driver Hole sensing device for spike driver

1977-03-21

1979-05-01

Sheridan, Robert G.

Electricity: circuit makers and breakers

Special application

Feeler moves into detecting contact with object

104 17R, 227 2, H01H 316

Patent

active

041525582

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.

REFERENCES:
patent: 2144858 (1939-01-01), Smith
patent: 3339040 (1967-08-01), Vilkas
patent: 3577955 (1971-05-01), Palmer
patent: 3753404 (1973-08-01), Bryan
patent: 3753405 (1973-08-01), Bryan
patent: 4019003 (1977-04-01), Duerksen

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