Door latch

Details Door latch Door latch

1976-09-20

1978-03-28

Frazier, Roy D.

Movable or removable closures

With safety brake or catch

292166, 292171, 292173, 292DIG36, E05D 1700

Patent

active

040807576

ABSTRACT:
The invention relates to a safety latch assembly for a warehouse type door that has rollers riding in a vertical guide track, such track having latching holes at various points along its length. The latch assembly has a latch pin with a roller end spring biased toward the track, and rides on the track with the door until it comes into latching engagement with one of the aforementioned holes, and locks the door into its current position. Withdrawing the latch pin from the hole resets the bias spring as the door becomes unlocked.

REFERENCES:
patent: 775186 (1904-11-01), Lovelace
patent: 1113667 (1914-10-01), Mahaj
patent: 1156632 (1915-10-01), Schoenherr
patent: 1215752 (1917-02-01), Walraven
patent: 1470382 (1923-10-01), Lance
patent: 1474158 (1923-11-01), Moore
patent: 2556361 (1951-06-01), Coleman
patent: 3543441 (1970-12-01), La Porte
patent: 3788678 (1974-01-01), Switzgable

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