Abstract: A lock assembly for locking and unlocking a door comprising a lock bar moveable between a locked and unlocked position, three locks, each of which have lock arms moveable between a locked and an unlocked position, and a linkage connecting the lock arms to the lock bar. The linkage has a first operating configuration whereby the lock bar moves from its locked to its unlocked position in response to the movement of any pair of lock arms from their locked to their unlocked position. The linkage also has a second operating configuration whereby the lock bar moves from its locked to its unlocked position in response to either movement by a predetermined pair of lock arms from their locked to unlocked position or the movement of the third lock arm from its locked to unlocked position.

Abstract: A lock assembly for locking and unlocking a door comprising a lock bar moveable between a locked and unlocked position, three locks, each of which have lock arms moveable between a locked and an unlocked position, and a linkage connecting the lock arms to the lock bar. The linkage has a first operating configuration whereby the lock bar moves from its locked to its unlocked position in response to the movement of any pair of lock arms from their locked to their unlocked position. The linkage also has a second operating configuration whereby the lock bar moves from its locked to its unlocked position in response to either movement by a predetermined pair of lock arms from their locked to unlocked position or the movement of the third lock arm from its locked to unlocked position.

Abstract: A blower and valve apparatus for a pneumatic tube system is enclosed in a divided housing (10). A conventional blower fan (36) operates to create pressure in a pressure area P and suction in a suction area S of the housing. Area P has two air passage outlets; a first pressure outlet (38) to atmosphere and a second pressure outlet (40) to a neutral area C. Area S likewise has two air passage outlets; a first suction outlet (44) to atmosphere and a second suction outlet 42 to neutral area C. Area C is connected through a coupling (23) to the end of a pneumatic tube. A first rotatable flapper vane (50) is mounted in area P. At one extreme of its arcuate movement, the rotatable flapper vane closes the first pressure outlet to atmosphere and at the other extreme closes the second pressure outlet to area C. A second rotatable flapper vane (54) is mounted in area S.