Appeal 2007-0119
Application 10/706,190
THE INVENTION
The Appellants claim 1) a mine stopping door system, 2) a mine stopping in
combination with the mine stopping door system, and 3) a method of using that
combination’s door. Claim 28, which claims the mine stopping door system, is
illustrative:
28. A door system for closing a doorway in a mine stopping,
said door system comprising:
a door frame including a first frame member and a second
frame member;
a door hingedly mounted on the first frame member for
swinging relative to the stopping between a closed position and an
open position swung outwardly away from the stopping;
a keeper disposed on the second frame member; and
a trigger-actuated latch mechanism including a detent
engageable with the keeper for latching the door in its closed position
and a trigger operably connected to the detent in a latched position,
the detent in the latched position being biased toward an unlatched
position, the mechanism being constructed and configured so that
actuation of the trigger causes the detent to move from the latched
position in which the detent engages the keeper for latching the door
closed to the unlatched position in which the detent is disengaged
from the keeper for allowing the door to be opened.
THE REFERENCES
Landis US 2,804,329 Aug. 27, 1957
Kennedy US 4,082,331 Apr. 4, 1978
Clavin US 5,638,709 Jun. 17, 1997
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