Fluid-operated communication system

Abstract

A communication system including a fluid-operated calling device mounted in a first location in a building, and a fluid-operated indicator mounted in a second location in a building and in fluid communication with the fluid-operated calling device, wherein actuation of the fluid-operated calling device causes the fluid-operated indicator to provide an indication that the fluid-operated calling device has been actuated. A fluid-operated lock may be mounted near the fluid-operated calling device and in fluid communication with a fluid-operated actuator, wherein actuation of the fluid-operated actuator causes opening of the fluid-operated lock.

1 . A communication system comprising: 
 a fluid-operated calling device mountable in a first location in a building; and    a fluid-operated indicator mountable in a second location in a building and in fluid communication with said fluid-operated calling device, wherein actuation of said fluid-operated calling device causes said fluid-operated indicator to provide an indication that said fluid-operated calling device has been actuated.    
   
   
       2 . The communication system according to  claim 1 , further comprising a fluid-operated lock mountable near said fluid-operated calling device and in fluid communication with a fluid-operated actuator, wherein actuation of said fluid-operated actuator causes opening of said fluid-operated lock.  
   
   
       3 . The communication system according to  claim 2 , further comprising a lock-open indicator associated with said fluid-operated lock and actuable by at least one of said fluid-operated lock and said fluid-operated actuator, wherein actuation of said lock-open indicator provides an indication that said fluid-operated lock is open.  
   
   
       4 . The communication system according to  claim 3 , wherein at least one of said fluid-operated indicator and said lock-open indicator comprises a fluid-operated shutter, which in a nominal position blocks viewing a visual indication, wherein actuation of said fluid-operated shutter comprises movement of said fluid-operated shutter to permit viewing the visual indication.  
   
   
       5 . The communication system according to  claim 4 , wherein said visual indication comprises a flashing light beam.  
   
   
       6 . The communication system according to  claim 4 , wherein said visual indication comprises a colored surface of a different color than an outer surface of said fluid-operated shutter.  
   
   
       7 . A communication system comprising: 
 a fluid-operated calling device mounted in a first location in a building;    a fluid-operated indicator mounted in a second location in a building and in fluid communication with said fluid-operated calling device, wherein actuation of said fluid-operated calling device causes said fluid-operated indicator to provide an indication that said fluid-operated calling device has been actuated; and    a fluid-operated lock mounted near said fluid-operated calling device and in fluid communication with a fluid-operated actuator, wherein actuation of said fluid-operated actuator causes opening of said fluid-operated lock.    
   
   
       8 . The communication system according to  claim 7 , wherein said fluid-operated actuator is mounted in a same room as said fluid-operated indicator.  
   
   
       9 . The communication system according to  claim 8 , further comprising a lock-open indicator associated with said fluid-operated lock and actuable by at least one of said fluid-operated lock and said fluid-operated actuator, wherein actuation of said lock-open indicator provides an indication that said fluid-operated lock is open.  
   
   
       10 . The communication system according to  claim 9 , wherein at least one of said fluid-operated indicator and said lock-open indicator comprises a fluid-operated shutter, which in a nominal position blocks viewing a visual indication, wherein actuation of said fluid-operated shutter comprises movement of said fluid-operated shutter to permit viewing the visual indication.  
   
   
       11 . The communication system according to  claim 10 , wherein said visual indication comprises a flashing light beam.  
   
   
       12 . The communication system according to  claim 10 , wherein said visual indication comprises a colored surface of a different color than an outer surface of said fluid-operated shutter.