Adjustable height load bearing support structure

A - Human Necessities – 47 – B

Patent

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Details

A47B 9/02 (2006.01) A47B 9/00 (2006.01)

Patent

CA 2252936

A counterbalanced adjustable height load bearing support structure (20) with a pretensioning mechanism comprises a pair of pivotable arms (42, 42) each having a free end (44) in engagement with a support assembly (24) and being biased by a torsion spring (40). A lever arm (154) is connected to each torsion spring (40) and exerts a biasing force on the pivotable arm (42) when the lever (154) is rotated, thereby preloading the springs. A cable (122) connects the lever arms and passes over a central bushing (170). The bushing (170) receives a threaded shaft (150) which may be turned to move the bushing and thereby adjust the tension in the cable. Because the cable (122) is capable of sliding engagement with the bushing (170), tension in the cable is substantially uniform throughout its entire length and thus the resultant forces on the lever arms (154) are approximately equal, whereby binding or racking of the support assemblies (20) is minimized as the support surface (32) is raised or lowered.

L'invention concerne une structure de support (20) porte-charge de hauteur ajustable à contrepoids, pourvue d'un mécanisme de précontrainte comprenant deux bras (42, 42) pivotants, chacun étant doté d'une extrémité (44) libre entrant en contact avec un ensemble support (24), et étant contraint par un ressort (40) de torsion. Un bras de levier (154) est connecté à chaque ressort (40) de torsion, et exerce une force de contrainte sur le bras (42) pivotant lorsqu'on fait tourner le levier (154), laquelle force précontraint les ressorts. Un câble (122) connecte les bras de levier et passe au-dessus d'une bague (170) centrale. Cette bague (170) reçoit une tige (150) filetée qui peut être tournée afin de déplacer la bague, et permettre ainsi d'ajuster la tension dans le câble. Du fait que le câble (122) est susceptible d'entrer en contact coulissant avec la bague (170), la tension dans le câble est sensiblement uniforme à travers toute sa longueur, et par conséquent les forces résultantes s'appliquant sur les bras de levier (154) sont approximativement égales, ce qui permet de minimiser un bombage et une déformation des ensembles support (20) lorsque la surface de support (32) est levée ou baissée.

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