Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1990-06-26
1991-11-05
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
49 28, 74 8914, 200500, 310 68B, 310 80, 318282, F16K 3150, H01H 316, H02K 706
Patent
active
050633163
ABSTRACT:
An automatic door protective device for returning an overhead door to the open position when it encounters an obstacle as it is closing. The protective device of this invention includes a motor having an output shaft and a driving gear mounted on the shaft. A driven gear is in mesh with the driving gear mounted on a gear shaft which also mounts a worm. A worm wheel is in mesh with the worm which is mounted on a worm wheel shaft, which also mounts a pulley that raises and lowers the door in response to rotation of the output shaft to the motor. The end of the gear shaft is spaced away from a copper leaf spring, and an electrical contact is also provided spaced away from the leaf spring. The spring and the contact are part of an electrical circuit with a signal controller coupled to the motor. When the door encounters an obstacle and the pulley ceases rotation, the torque of the motor causes the gear shaft to displace axially as the worm moves along the worm wheel teeth. The end of the gear shaft forces the leaf spring into electrical contact with the contact, and this completes the circuit to the signal controller, which causes the motor to immediately reverse its direction of rotation of the output shaft.
REFERENCES:
patent: 1734500 (1929-11-01), Rogers
patent: 2203233 (1940-06-01), Panish
patent: 2421178 (1948-10-01), Brownlee
patent: 3930133 (1975-12-01), Sulzer
patent: 4092575 (1978-05-01), Ogishi et al.
patent: 4346728 (1982-08-01), Sulzer
patent: 4742245 (1988-05-01), Yoshida et al.
patent: 4750294 (1988-06-01), Lafontaine
Rebsch D. L.
Stephan Steven L.
LandOfFree
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