Finger walker for tube sheet

Details Finger walker for tube sheet Finger walker for tube sheet

1982-09-27

1984-05-22

Pekar, John A.

Motor vehicles

Special driving device

Stepper

414750, 165 11A, 165 76, B25J 502, F28G 1504

Patent

active

044495994

ABSTRACT:
A "finger walker" apparatus for remotely traversing a flat surface having a regular array of openings, such as the tube sheet of a nuclear steam generator. The apparatus has a rectangular base having four base fingers disposed in a rectangular pattern for engagement with the openings. An annular platform surrounds the base and is rotatable about the base. The base is adapted to move linearly a pitch multiple within the platform. Fingers on the platform are adapted for engagement with the openings. The apparatus can orient itself for movement in one of many directions by engaging the platform fingers, disengaging the base fingers and rotating the base until the axis of the base is aligned with the intended direction of travel. The apparatus then advances by alternatingly engaging and disengaging the base and platform fingers in coordination with the base and platform moving linearly relative to each other.

REFERENCES:
patent: 3889820 (1975-06-01), Ranger
patent: 3913452 (1975-10-01), Ward et al.
patent: 3913752 (1975-10-01), Ward et al.
patent: 4018344 (1977-04-01), Leshem
patent: 4018345 (1977-04-01), Formanek et al.
patent: 4018346 (1977-04-01), Leshem et al.
patent: 4074814 (1978-02-01), Cooper et al.
patent: 4193735 (1980-03-01), Savor et al.

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