Handling: hand and hoist-line implements – Magnet
Patent
1990-12-31
1992-09-08
Cherry, Johnny D.
Handling: hand and hoist-line implements
Magnet
244161, 294 662, 294 864, 294907, 414737, 901 40, B25J 1506, B64G 164, B66C 104
Patent
active
051452278
ABSTRACT:
An electromagnetic attachment mechanism for use as an end effector of a remote manipulator system. A pair of electromagnets 15A, 15B, each with a U-shaped magnetic core with a pull-in coil 34 and two holding coils 35,36 are mounted by a spring suspension system 38,47 on a base plate 25 of the mechanism housing 30 with end pole pieces 21,22 adapted to move through openings in the base plate when the attractive force of the electromagnets is exerted on a strike plate 65 of a grapple fixture 20 affixed to a target object 14. The pole pieces are spaced by an air gap from the strike plate when the mechanism first contacts the grapple fixture. An individual control circuit and power source is provided for the pull-in coil and one holding coil of each electromagnet. A back-up control circuit connected to the two power sources and a third power source is provided for the remaining holding coils. When energized, the pull-in coils overcome the suspension system and air gap and are automatically de-energized when the pole pieces move to grapple and impose a preload force across the grapple interface. A battery back-up 89A, 89B is a redundant power source for each electromagnet in each individual control circuit and is automatically connected upon failure of the primary power source. A centerline mounted camera 31 and video monitor 70 are used in cooperation with a target pattern 19 on the reflective surface 67 of the strike plate to effect targeting and alignment.
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Barr Hardie R.
Cherry Johnny D.
Fein Edward K.
Miller Guy M.
The United States of America as represented by the Administrator
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