Lifting Chair

Abstract

A lifting chair having a chassis and a seat designed to move with respect to the chassis between a raised position and lowered position. A handling system drives the seat from the lowered position to the raised position and vice versa, and has a main winch and a secondary winch that are fixed to the chassis and, for each winch, a flexible link is provided. One of the ends of the flexible link is fixed to the seat and the other end is fixed to the drum of the winch. The flexible link connected to the main winch is tensioned and the flexible link connected to the secondary winch is relaxed. A synchronisation device is provided for driving the winding and unwinding of the flexible link connected to the secondary winch by a length equal to the length of winding and unwinding of the flexible link connected to the main winch.

1 ) Lifting chair ( 100 ) comprising:
 a chassis ( 102 ),   a seat ( 104 ) designed to move with respect to the chassis ( 102 ) between a raised position and lowered position,   a handling system ( 106 ) designed to drive the seat from the lowered position to the raised position and vice versa, and comprising a main winch ( 150   a ) and a secondary winch ( 150   b ) that are fixed to the chassis ( 102 ) and, for each winch ( 150   a,    150   b ), a flexible link ( 152   a ,  152   b ) one of the ends of which is fixed to the seat ( 104 ) and the other end of which is fixed to the drum of the said winch ( 150   a,    150   b ), the flexible link ( 152   a ) connected to the main winch ( 150   a ) being tensioned and the flexible link ( 152   b ) connected to the secondary winch ( 150   b ) being relaxed, and   a synchronisation means ( 204 ) comprising means for driving the winding and unwinding of the flexible link ( 152   b ) connected to the secondary winch ( 150   b ) by a length equal to the length of winding and unwinding of the flexible link ( 152   a ) connected to the main winch ( 150   a ).   
     
     
         2 ) Lifting chair ( 100 ) according to  claim 1 , wherein it further comprises at least one beam ( 110 ) and for the or each beam ( 110 ) one of the ends is mounted so as to rotate freely about a horizontal axis on the chassis ( 102 ), and the other end is mounted so as to rotate freely about a horizontal axis on the seat ( 104 ). 
     
     
         3 ) Lifting chair ( 100 ) according to  claim 2 , wherein it further comprises at least two parallel beams ( 110 ) arranged one above the other. 
     
     
         4 ) Lifting chair ( 100 ) according to  claim 1 , wherein the synchronisation means ( 204 ) is a rigid plate mounted so as to rotate freely on each crank ( 202   a ,  202   b ) about the axis of the gripping part ( 206   a,    206   b ) of the corresponding crank ( 202   a,    202   b ). 
     
     
         5 ) Lifting chair ( 100 ) according to  claim 4 , wherein it further comprises a lever ( 302 ) one of the ends of which is mounted so as to rotate freely on the chassis ( 102 ) and the other end of which is mounted so as to rotate freely on the synchronisation means ( 204 ), the two rotation axes of the lever ( 302 ) being parallel to the rotation axes of the cranks ( 202   a,    202   b ) and the rotation axis of the lever ( 302 ) on the chassis ( 102 ) not being contained in the plane passing through the rotation axes of the two cranks ( 202   a,    202   b ). 
     
     
         6 ) Lifting chair ( 100 ) according to  claim 1 , wherein the seat ( 104 ) has two armrests ( 112 ) that extend horizontally and each has a free end ( 114 ) that is curved upwards.