Mast extending and rotating apparatus

Details Mast extending and rotating apparatus Mast extending and rotating apparatus

1988-06-15

1989-09-12

Ridgill, Jr., James L.

Static structures (e.g., buildings)

Striplike unit, reversibly flexible and rigid

52111, 52118, 52121, 52632, E04H 1218

Patent

active

048647845

ABSTRACT:
A mast defined by three flexible longerons with cross elements coils into a canister. Extension and retraction are controlled by three axially oriented lead screws which engage protuberances spaced along the longerons. The lead screws are mutually synchronzied by an annular planet gear, and are driven by a spiroidal gear set. At a predetermined mast extension, motor drive is switched over for rotation of the mast rather than extension-retraction. The switch over is controlled by an actuator in the form of a movable guide element dimensioned to clear normal-sized protuberances but to be seized and carried by an oversize protuberance at the desired mast extension. The actuator is coupled to a lock which unlocks the annular gear to the canister so that motor drive results in mast rotation. An auxiliary lock allows re-locking of the canister to the support structure for allowing resumption of the mast extension-retraction mode.

REFERENCES:
patent: 1250108 (1917-12-01), Seymour
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patent: 4062156 (1977-12-01), Roth
patent: 4332238 (1982-06-01), Garcie, Jr.
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patent: 4524552 (1985-06-01), Hujsak
patent: 4532742 (1985-08-01), Miura
patent: 4588151 (1986-05-01), Mori
patent: 4725025 (1988-02-01), Binge et al.
patent: 4772175 (1988-09-01), Grimaldi
"Astromasts for Space Applications", prepared by Astro Aerospace Corporation, Jul. 1985.

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