Have invented certain new and useful improvements in method and

Details Have invented certain new and useful improvements in method and Have invented certain new and useful improvements in method and

1985-02-08

1988-05-31

Ruggiero, Joseph F.

Boots, shoes, and leggings

73151, 175 40, 175 52, G06F 1520

Patent

active

047485639

ABSTRACT:
The invention relates to the automatic control of the lifting travel of a string of pipes suspended from a cable. To stop this string of pipes systematically in a specific position, a first passage check controlled by a sensor, for example sensitive to the rotation of the pulley over which the cable passes, is associated with a second location check controlled by a sensor, for example sensitive to the passage at a given level of the joints separating the pipes two by two.

REFERENCES:
patent: 3628025 (1971-12-01), Kieferle
patent: 4110688 (1978-08-01), Bailey
patent: 4134476 (1979-01-01), Zolnerovitch
patent: 4139891 (1979-02-01), Sheldon
patent: 4354233 (1982-10-01), Zhukovsky et al.
patent: 4407017 (1983-09-01), Zhilikov
patent: 4570234 (1980-02-01), Baack
patent: 4594665 (1986-06-01), Chandra et al.
patent: 4604724 (1986-08-01), Shaginian et al.
The Electronic Engineer, vol. 29, No. 10, Oct. 1970, J. Hickey: "Optoelectronics Part 3A, Application Ideas" pp. 59-63.

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