Door or gate obstruction control

Details Door or gate obstruction control Door or gate obstruction control

1985-11-26

1987-10-20

Ro, Bentsu

Electricity: motive power systems

Motor-reversing

Periodic- or intermittent-reversing

318456, 318469, 318473, 49 28, H02P 122, G05D 310

Patent

active

047016841

ABSTRACT:
An obstruction sensing and control arrangement for door or gate opening-closing mechanisms. The arrangement compares the operating rate of change of a predetermined characteristic with a preset rate of change and stops or reverses the motor in the opening/closing mechanism. The characteristic preferred is motor body temperature which is monitored indirectly. The control arrangement also includes a back up static control threshold to sense a second static operating characteristic of the motor and a second comparator means set at a preset threshold level to stop or reverse the motor. A common motor sensor is used for both the dynamic and static control thresholds. The invention also includes means to sense operating temperature and to alter the preset static threshold level automatically in response to temperature changes.

REFERENCES:
patent: 3891909 (1975-06-01), Newson
patent: 4220900 (1980-09-01), Mintz
patent: 4234833 (1980-11-01), Barrett
patent: 4347465 (1982-08-01), Goertler et al.
patent: 4394605 (1983-07-01), Terazawa
patent: 4468596 (1984-08-01), Kinzl et al.
patent: 4514670 (1985-04-01), Fassel et al.
patent: 4563623 (1986-01-01), Matsuka
patent: 4628234 (1986-12-01), Mizuta et al.

Affiliated with

Also associated with

Rating

Door or gate obstruction control does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Door or gate obstruction control, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Door or gate obstruction control will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1614455