초록 ▼

A support arm system for selectively positioning relatively heavy objects such as television sets consisting of articulated forward and rear arms each comprised of parallelogram linkages which are each sprung to counterbalance the load weight. A special mounting of the forward arm springs enables a

A support arm system for selectively positioning relatively heavy objects such as television sets consisting of articulated forward and rear arms each comprised of parallelogram linkages which are each sprung to counterbalance the load weight. A special mounting of the forward arm springs enables a compact configuration, but which introduces slight unbalance conditions in some arm positions. An adjustable friction brake arrangement is incorporated in a pivot point of each linkage which applies a braking force to insure stable positioning of each of the arms in any position throughout the motion of the arm system notwithstanding unbalanced conditions. Also disclosed is a quick connect feature for mounting the supported load to the forward arm, which is combined with a parking lock securing the forward arm in a folded position, which parking lock is released during the connecting feature. An access opening enables convenient adjustment of the forward arm spring force to precisely balance a given supported load weight.

대표청구항 ▼

A counterbalanced swinging arm including a parallelogram linkage for supporting a load in various adjusted positions of said arm while counterbalancing said load in any of said positions, said parallelogram linkage comprising: a pair of parallel links; a first bracket; means pivotally mounting one e

A counterbalanced swinging arm including a parallelogram linkage for supporting a load in various adjusted positions of said arm while counterbalancing said load in any of said positions, said parallelogram linkage comprising: a pair of parallel links; a first bracket; means pivotally mounting one end of each of said links to said first bracket; a second bracket and means pivotally mounting the other end of each of said links to said second bracket; means for supporting said first bracket for enabling outward swinging movement of said links on said pivotal mounts; means for attaching a load to said second bracket; spring means connected to act on said second bracket and on at least one of said links along a line of direction so as to resist rotation of said one of said links about said pivotal mounts thereof in a direction opposite to a moment created by the weight of said attached load, said spring means located to exert a spring force acting with increasing leverage on said pivotal mount through a range of motion of said parallelogram linkage in swinging outwardly away from said first bracket thereby to produce a counterbalancing moment with outward movement of said parallelogram linkage to thereby offset the increase in moment exerted by said attached load with said outward arm motion; adjustable friction brake means introducing a frictional braking force into said pivotal mounts of one of said links; whereby a frictional braking force resisting said pivotal movement is introduced into said parallelogram linkage to absorb any unbalanced moment exerted by said attached load and spring means at positions of said parallelogram linkage as said arm undergoes said swinging motion.