Photography – Camera support – Adjustable support
Reexamination Certificate
2007-08-09
2010-12-21
Perkey, W. B. (Department: 2862)
Photography
Camera support
Adjustable support
Reexamination Certificate
active
07854555
ABSTRACT:
A camera crane has a telescopically extendible arm with a camera platform supported at the front end of the arm. A mechanical leveling system is linked to the camera platform to keep the camera platform in a substantially horizontal or level position, regardless of the elevation angle of the arm. A counter weight moves along the arm as the arm extends and retracts, to help keep the arm balanced. A stabilizing system provides instantaneous corrective movements to the camera platform, to keep the camera platform level. The stabilizing system includes a sensor for sensing the angular position of the camera platform. An electronic controller provides a positive preload to a first motor, and a negative preload to the second motor, driving the camera platform, to avoid backlash. Upon sensing an out of level position, the controller provides a corrective signal to the motors, causing both motors to drive the camera platform back towards level.
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Chapman/Leonard Studio Equipment Inc.
Ohriner Kenneth H.
Perkey W. B.
Perkins Coie LLP
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