Method for controlling stretching and contracting operations of

Details Method for controlling stretching and contracting operations of Method for controlling stretching and contracting operations of

1983-10-17

1986-05-13

Chin, Gary

Boots, shoes, and leggings

364463, 340685, 212151, G06F 1520, B66C 2300

Patent

active

045890765

ABSTRACT:
A method for controlling operating cylinders in extending and contracting operations of a multistage telescopic boom including a base boom portion, an intermediate boom portion and a fore boom portion, the method including the steps of detecting the length of the boom by means of a boom length detector; permitting extension or contraction of a cylinder of the intermediate boom portion alone when the value (l) of a detected length is smaller than a first preset reference value (L-.beta.) which is determined by subtracting a preset arbitrary length (.beta.) from an actual length (L) of a boom with the intermediate boom portion fully extended relative to the base boom portion and a fore boom portion fully contracted relative to the intermediate boom portion; permitting extension or contraction of a cylinder of the fore boom portion alone when the detected value (l) is greater than a second preset reference value (L+.beta.); detecting a variation per unit time of the detected value (l) when the value (l) is in the range between the first and second reference values (L-.beta.) and (L+.beta.); continuing the boom extension or contraction by a currently operating cylinder while the variation is greater than a predetermined value; and switching the operation to the boom extension or contraction by a cylinder of the next stage as soon as the variation becomes smaller than the predetermined value.

REFERENCES:
patent: 3809248 (1974-05-01), Ohniwa et al.
patent: 3922789 (1975-12-01), Sarrell
patent: 4125974 (1978-11-01), Kay et al.
patent: 4178591 (1979-12-01), Geppert
patent: 4185280 (1980-01-01), Wilhelm
patent: 4236864 (1980-12-01), Couture et al.
patent: 4395706 (1983-07-01), Garber
patent: 4456093 (1984-06-01), Finley et al.

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