Armchair adjusting device

Abstract

The invention concerns a device for adjusting the position of a support element such as an armchair seat in particular a hairdresser's reclining chair comprising at least an actuator capable of modifying the position of the support element, and a three-way distributor ( 8 ) comprising a supply channel ( 10 ), a working channel ( 11 ) and a return channel ( 12 ), the supply channel being connected to a public water distribution network, the working channel being connected to the waste water network, the distributor being capable of controlling the displacement of the actuator by introducing therein water under pressure coming from the public water distribution network or by returning water into the waste water network.

1 . A device for adjusting a position of a means of support comprising: 
 at least one actuator capable of modifying the position of the support element, and    a three way directional control valve comprising a supply line, a use line and a return line,    the supply line being connected to a water main,    the use line being connected to the actuator, and    the return line being connected to a sewer,    the directional control valve being capable of controlling movement of the actuator by introducing into the actuator water under pressure from the water main or by returning the water to the sewer.    
   
   
       2 . The device as claimed in  claim 1 , wherein the actuator is a jack connected to the use line, the jack including a piston, the piston being connected to the support element by an axial rod is moved by the water under pressure from the water distribution main.  
   
   
       3 . The device as claimed in  claim 1 , wherein the actuator comprises a structure in a form of a deformable parallelogram and a waterproof extensible bellows connected to the use line enclosed by a mobile upper plate and a fixed lower plate, between a contracted position and an extended position and a mechanism for guiding the movement of the bellows.  
   
   
       4 . The device as claimed in  claim 3 , wherein two links hinged to each other keep the upper and lower plates parallel to each other as the bellows extends.  
   
   
       5 . The device as claimed in  claim 3 , wherein the upper plate and the lower plate are connected by four uprights, the uprights guiding horizontal and vertical movement of the upper plate as the bellows extends.  
   
   
       6 . The device as claimed in  claim 1 , wherein the means of support comprises an adjustable armchair, including at least one of a seat base, a backrest, and a footrest.  
   
   
       7 . The device as claimed in  claim 2 , wherein a piston is connected to an axial rod on which the seat base is arranged, the adjustment of the position of the piston being effected by an action of the directional control valve to introduce water under pressure into a cylinder or by releasing the water present therein into the sewer.  
   
   
       8 . The device as claimed in  claim 6 , wherein an underside of the seat base comprises: 
 a return spring tending to move the armchair forward,    means enabling the armchair to slide relative to a plate connected to an axial rod and    at least one inelastic cable connecting the armchair to a fixed point, an upward movement of the plate resulting in a rearward movement of the seat base.    
   
   
       9 . The armchair as claimed in  claim 8 , wherein the underside of the seat base has at least three wheels guided in rails formed in the plate.  
   
   
       10 . The device as claimed in  claim 9 , wherein the plate has a pulley on a rear face to guide the inelastic cable.  
   
   
       11 . The device as claimed in  claim 6 , wherein the footrest is hinged to the armchair and comprises a board on which slides a support element, a jack being able to pivot the footrest between a retracted position in which the support element is superposed on the plate and an extended position in which the support element is in a continuation of the board.  
   
   
       12 . The device as claimed in  claim 11 , wherein the support element is, at an extremity adjacent to the hinge between the support element and the armchair, connected to a fixed point on the armchair by a cable running through a sheath connected to the board at a furthest extremity thereof from the hinge between the support element and the armchair.  
   
   
       13 . The device as claimed in  claim 12 , wherein the support element is returned by a spring.