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Motor actuated vacuum doorDoors that allow scientific instruments to record and retrieve the observed data are often required to be designed and installed as a part of sounding rocket hardware. The motor-actuated vacuum door was designed to maintain a medium vacuum of the order of 0.0001 torr or better while closed, and to provide an opening 15 inches long x 8.5 inches wide while open for cameras to image Halley's comet. When the electric motor receives the instruction to open the door through the payload battery, timer, and relay circuit, the first operation is to unlock the door. After unlatching, the torque transmitted by the motor to the main shaft through the links opens the door. A microswitch actuator, which rides on the linear motion conversion mechanism, is adjusted to trip the limit switch at the end of the travel. The process is repeated in the reverse order to close the door. 'O' rings are designed to maintain the seal. Door mechanisms similar to the one described have flown on Aerobee 17.018 and Black Brant 27.047 payloads.
Document ID
19870028455
Document Type
Conference Paper
Authors
Hanagud, A. V. (NASA Wallops Flight Center Wallops Island, VA, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1986
Subject Category
SPACECRAFT INSTRUMENTATION
Report/Patent Number
AIAA PAPER 86-2561
Distribution Limits
Public
Copyright
Other