Ceiling access door assembly

Details Ceiling access door assembly Ceiling access door assembly

1985-11-18

1988-04-19

Dorner, Kenneth J.

Movable or removable closures

With means mounting closure for swinging

With biasing means

49401, 52204, E05F 110

Patent

active

047380543

ABSTRACT:
This disclosure relates to an access door assembly for a ceiling. The assembly includes a frame adapted to be attached to supports of the ceiling and mounted in a generally horizontal position, and a door which fits within and has one edge hingedly connected to the frame. The hinge enables the door to swing between a generally horizontal closed position within the frame and a lowered open position. A constant-force return spring urges the door to the closed position, and an automatically engageable lock is provided for holding the door in the closed position. The frame and the door have closely adjacent Z-shaped frame members and the door is made of heat-resistant material, to form a fire retardant construction.

REFERENCES:
patent: 877363 (1908-01-01), Nielsen
patent: 1114271 (1914-10-01), Kundtz
patent: 1188395 (1916-06-01), Bessler
patent: 1700904 (1929-02-01), Marschke
patent: 1721521 (1929-07-01), Marschke
patent: 1731980 (1929-10-01), Marschke
patent: 1767148 (1930-06-01), Marschke
patent: 1883777 (1932-10-01), Frazier
patent: 2095392 (1937-10-01), Marschke
patent: 2163142 (1939-06-01), Frazier
patent: 2196546 (1940-04-01), Bowers
patent: 2314004 (1943-03-01), Marschke
patent: 2927353 (1960-03-01), Snitker
patent: 4133074 (1979-01-01), Schack
patent: 4227345 (1980-10-01), Durham
patent: 4299059 (1981-11-01), Smith

Affiliated with

Also associated with

Rating

Ceiling access door assembly does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Ceiling access door assembly, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ceiling access door assembly will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2168428