Work table

Abstract

A work table is provided with a housing ( 10, 23 ) and a rotary element ( 11, 12, 24 ) mounted rotatably at the housing ( 10, 23 ) as well as with a locking device ( 22, 23, 26 ) for fixing the particular angle of rotation position of the rotary element ( 11, 12, 24 ) in relation to the housing ( 10, 23 ). To provide the work table with a fail-safe behavior the locking device ( 22, 23, 26 ) is released by a first actuating member when the energy supply is switched on and is activated by means of a restoring member when the energy supply is switched off. An additional actuating member may be provided to boost the locking force.

1 . A work table, comprising: 
 a housing;    a rotary element mounted rotatably at said housing;    a locking means for fixing the particular angle of rotation position of said rotary element in relation to said housing;    an actuating member; and    a restoring member, wherein said locking means is released by means of said first actuating member when the energy supply is switched on and is activated by means of said restoring member when the energy supply is switched off.    
   
   
       2 . A work table in accordance with  claim 1 , further comprising an additional actuating member provided to boost the locking force.  
   
   
       3 . A work table in accordance with  claim 1 , wherein said restoring member is a weight utilizing the force of gravity.  
   
   
       4 . A work table in accordance with  claim 1 , wherein said restoring member is at least one spring.  
   
   
       5 . A work table in accordance with  claim 1 , wherein a pressurizing agent is admitted to said actuating member to release said locking member.  
   
   
       6 . A work table in accordance with  claim 5 , wherein said actuating member is an annular piston guided sealingly in an annular groove.  
   
   
       7 . A work table in accordance with  claim 1 , wherein said actuating member activates a fixed disk, which is nonrotatable in relation to said housing and cooperates with a disk, which is rotatable but nonrotatable in relation to said rotary element, to fix said rotary element.  
   
   
       8 . A work table in accordance with  claim 7 , wherein said fixed disk is actuated by a restoring member to fix said rotary element.  
   
   
       9 . A work table in accordance with  claim 1 , wherein said additional actuating member is an annular piston actuated by a pressurizing agent.  
   
   
       10 . A work table in accordance with  claim 9 , wherein said annular piston is guided sealingly in an annular groove.  
   
   
       11 . A work table, comprising: 
 a housing;    a first rotary element mounted rotatably at said housing;    a second rotary element mounted rotatably at said first rotary element;    a first locking means for fixing a particular angle of rotation position of said first rotary element in relation to said housing;    a second locking means for fixing the particular angle of rotation position of said second rotary element in relation to said first rotary element;    an actuating member;    a restoring member, wherein said locking means is released by means of an actuating member when the energy supply is switched on and activated by means of a restoring member when the energy supply is switched off.    
   
   
       12 . A work table in accordance with  claim 11 , wherein a additional actuating member is provided to boost the locking force.  
   
   
       13 . A work table in accordance with  claim 11 , wherein said restoring member is a weight utilizing the force of gravity.  
   
   
       14 . A work table in accordance with  claim 11 , wherein said restoring member is at least one spring.  
   
   
       15 . A work tables in accordance with  claim 11 , wherein a pressurizing agent is admitted to said actuating member to release said locking means.  
   
   
       16 . A work table in accordance with  claim 15 , wherein said actuating member is an annular piston guided sealingly in an annular groove.  
   
   
       17 . A work table in accordance with  claim 1 , wherein said actuating member actuates a fixed disk, which is nonrotatable in relation to said housing and cooperates with a disk, which is rotatable but nonrotatable in relation to said rotary element to fix said rotary element.  
   
   
       18 . A work table in accordance with  claim 17 , wherein said fixed disk is actuated by means of a restoring member to fix said rotary element.  
   
   
       19 . A work table in accordance with  claim 18 , wherein said additional actuating member is a piston actuated by a pressurizing agent.  
   
   
       20 . A work table in accordance with  claim 19 , wherein said piston is an annular piston guided sealingly in an annular groove.