Piston stroke digital determination means

Details Piston stroke digital determination means Piston stroke digital determination means

1986-06-06

1988-09-06

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

116202, G01D 534

Patent

active

047695382

ABSTRACT:
The invention concerns apparatus for the determination of the length of stroke of a piston in a working cylinder, especially in a hydraulic, walking, mine-roof support. For this purpose a piston shaft is rotatably mounted in one end portion of the working cylinder and extends into a hollow cylindrical piston rod of the piston. Through a pin on the piston or piston rod which engages in a helical guide groove on the piston shaft, the latter is rotated during movements of the piston. The piston shaft is connected to a code plate provided with a pattern of holes and displaceable on rotation of the shaft between light-emitting elements on one side and light-detecting diodes on the other side. The combination of irradiated and darkened light-detecting diodes represents a digitally-detectable binary numeral sequence which corresponds to a specific piston position.

REFERENCES:
patent: 2566332 (1951-09-01), Huber
patent: 2567430 (1951-09-01), Griffiths
patent: 4123653 (1978-10-01), Bovio

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