Guidance device for drain tile laying machine

Details Guidance device for drain tile laying machine Guidance device for drain tile laying machine

1979-03-26

1981-01-13

Crowder, Clifford D.

Excavating

Snow or ice removing or grooming by portable device

Railway clearer

37DIG1, 37DIG20, 172 45, 404 84, 405175, 405181, E02F 510, F16L 100

Patent

active

042441234

ABSTRACT:
An improved guidance device for use with an earthworking machine, more especially a drain tile laying machine, comprising a earthworking element mounted about a pivot connection. This guidance device comprises a signal emitter and two signal receivers mounted on the earthworking element of the machine. The two signal receivers are mounted on the element in a longitudinal spaced apart relation, so as to distinguish between a depth change or an attitude change in the element. The guidance device also comprises operating means including an electronic control circuit and an hydraulic operating circuit for adjusting the attitude or depth of the element depending on the indication given by the signal receivers.

REFERENCES:
patent: 3046681 (1962-07-01), Kutzler
patent: 3778168 (1973-12-01), Willner
patent: 3813171 (1974-05-01), Teach et al.
patent: 4050171 (1977-09-01), Teach
patent: 4120364 (1978-10-01), Wooldridge
patent: 4142817 (1979-03-01), Lazure
patent: 4162708 (1979-07-01), Johnson

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