Motors: spring – weight – or animal powered – Spring – With winding means
Patent
1992-03-23
1993-03-16
Herrmann, Allan D.
Motors: spring, weight, or animal powered
Spring
With winding means
16 49, 16 64, 49386, 74 8917, 318376, 318760, F03G 100, E05F 300, F16H 1904
Patent
active
051936470
ABSTRACT:
A device for controlling swinging doors utilizing an externally powered motor to compress a spring during door opening to store energy in the spring. The motor is not used to open the door, but only to compress the spring, thereby utilizing a minimum amount of electrical energy and allowing for a very easy opening of the door. The motor acts as a generator during the closing of the door with generated electrical energy fed back to the motor to retard rotation of the rotor, providing a brake on the closing movement of the door. The feedback circuitry includes a switch for varying the braking during the final degrees of closing movement as well as a variable setting device allowing control of braking force.
REFERENCES:
patent: 581972 (1897-05-01), Wright
patent: 2645806 (1953-07-01), Turney
patent: 3087720 (1963-04-01), Catlett
patent: 3195879 (1965-07-01), Bond et al.
patent: 3237932 (1966-03-01), Catlett
patent: 3247617 (1966-04-01), Catlett
patent: 3425161 (1969-02-01), Catlett et al.
patent: 3457674 (1969-07-01), Catlett et al.
patent: 3864875 (1975-02-01), Hewitt
patent: 4045914 (1977-09-01), Catlett
patent: 4064589 (1977-12-01), Bejaramo et al.
patent: 4136304 (1979-01-01), Baechler et al.
patent: 4220051 (1980-09-01), Catlett
patent: 4333270 (1982-06-01), Catlett
patent: 4673848 (1987-06-01), Hagiwara et al.
patent: 4935677 (1990-06-01), Yoshida
patent: 4959598 (1990-09-01), Yoshida et al.
patent: 4973894 (1990-11-01), Johansson
patent: 4991347 (1991-02-01), Takimoto et al.
patent: 4999551 (1991-03-01), Yoshida et al.
patent: 5048151 (1991-09-01), Orii et al.
Herrmann Allan D.
Thomas Industries Inc.
LandOfFree
Easy opening door control device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Easy opening door control device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Easy opening door control device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-346931