Electricity: motive power systems – Plural diverse motor controls – Motor-reversing
Patent
1978-02-08
1978-12-26
Kannan, Philip C.
Electricity: motive power systems
Plural diverse motor controls
Motor-reversing
49 28, 49199, 49139, 318469, H02P 100, H02P 300
Patent
active
041318307
ABSTRACT:
An improved position control apparatus is disclosed to control a motor-driven door operator to halt movement of a door at an open position and a closed position. The position control apparatus includes a control screw means in the form of a threaded shaft extension of the motor shaft or a threaded rod coupled to the motor shaft which is rotated when the motor is energized. A travel nut is threadedly engaged with the control screw means and is constrained against rotational motion so as to reciprocate along the control screw means. Position detection means, such as switches, are disposed near the control screw means for actuation by the travel nut to control the motor as the door approaches the open position and the closed position. In another embodiment, a toggle switch is mounted on the travel nut, and the switches are replaced by stops for actuation of the toggle switch to control the motor. An improved obstruction detector apparatus is also provided to control the motor if an obstruction is encountered as the door moves between the open position and the closed position. The obstruction detector apparatus includes a safety switch which is actuable by rotation of the motor casing due to reaction torque, if an obstruction is encountered as the door moves in one direction, and a lever that is actuable by rotation of the motor casing, if an obstruction is encountered as the door moves in an opposite direction, to actuate the safety switch.
REFERENCES:
patent: 1686851 (1928-10-01), Gorman
patent: 2387533 (1945-10-01), Schmucker
patent: 2568808 (1951-09-01), Johanson
patent: 2751219 (1956-06-01), Dodge
patent: 2822166 (1958-02-01), Herbert
patent: 2882044 (1959-04-01), Ginte
patent: 2883182 (1959-04-01), Bornemann
patent: 3078407 (1963-02-01), Schaefer
patent: 3764875 (1973-10-01), Harris
patent: 3955661 (1976-05-01), Popper et al.
patent: 3996697 (1976-12-01), Bailey et al.
Lee Maw H.
Prehodka Barry V.
Clopay Corporation
Kannan Philip C.
LandOfFree
Position control and obstruction detector apparatus for a motor- does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Position control and obstruction detector apparatus for a motor-, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Position control and obstruction detector apparatus for a motor- will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1130667