Overload projection apparatus for small-sized tripod head

Details Overload projection apparatus for small-sized tripod head Overload projection apparatus for small-sized tripod head

1993-06-29

1995-03-21

Wysocki, Jonathan

Electricity: motive power systems

Limitation of motor load, current, torque or force

361 23, H02P 500

Patent

active

053999495

ABSTRACT:
An overload protection apparatus for a small-sized tripod head which is capable of protecting the driving portion when overload is applied thereto without the need for a mechanical apparatus such as a slip mechanism and the like. Motors drive two driving shafts which are orthogonal to each other. Position sensors detect the rotating positions of the two driving shafts. When displacement of the driving shafts is not detected by the position sensors although a driving command signal is output by a microcomputer, it is judged that overload is applied to the motors and the motors are forcibly stopped. When the motors are forcibly stopped, the gears are reversed by a predetermined amount. When the gears are reversed, the backlash of the gear is corrected. Driving members are stored in the main chassis and a controller is stored in a storage portion which is formed by a sub-chassis outside of the main chassis.

REFERENCES:
patent: 3766461 (1973-10-01), Leenhouts
patent: 4312033 (1982-01-01), Sweeney et al.
patent: 4338553 (1982-07-01), Scott, Jr.
patent: 4429264 (1984-01-01), Richmond
patent: 4528682 (1985-07-01), Nakaoki
patent: 4682091 (1987-07-01), Krewalk et al.
patent: 4943019 (1990-07-01), Mester
patent: 5081586 (1992-01-01), Berthel et al.
patent: 5214363 (1993-05-01), Wisner et al.

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