Adjustable lift system
A lift system is designed for raising and lowering a load. The lift system can include a movable portion in sliding engagement with a fixed portion. The lift system can be configured to translate the load coupled to the movable portion relative to the fixed portion. The lift system can also include a counterbalance mechanism having an arm rotatably coupled to the fixed portion, and one or more springs coupled to the arm and the fixed portion. The arm can be operably coupled to the movable portion through a cord. As the movable portion translates, the arm can rotate to deflect the one or more springs to provide a lift force to offset the weight of the load.
1 . A lift system for raising and lowering a load, the lift system comprising:
a fixed portion couplable to a structure;
a movable portion couplable to the load, the movable portion translatable relative to the fixed portion;
one or more sliding mechanisms coupled between the fixed portion and the movable portion, the one or more sliding mechanisms at least partially defining a range of travel of the movable portion relative to the fixed portion;
a counterbalance mechanism coupled to the fixed portion and the movable portion, the counterbalance mechanism operable to generate a lift force for countering a weight of the load, the counterbalance mechanism comprising:
an arm rotatably coupled to the fixed portion;
an adjustment mechanism coupled to the fixed portion;
an energy storage member coupled between the arm and the adjustment mechanism, the energy storage member configured to bias the arm to rotate in a first direction; and
a cord coupled to the arm and the movable portion;
an idler pulley coupled to the arm; and
one or more redirect pulleys coupled to the fixed portion;
wherein the cord is coupled to the fixed portion at a first end and coupled to the movable portion at a second end;
wherein the cord is routed around the idler pulley and one or more redirect pulleys between the first end and the second end; and
wherein the cord is configured to rotate the arm in a second direction opposite the first direction when the movable portion translates from a high position towards a low position.
2 . The lift system of claim 1 , wherein the energy storage member includes one or more of a gas spring, a compression spring, and an extension spring.
3 . The lift system of claim 1 , the adjustment mechanism comprising:
a bracket coupled to the fixed portion;
a glider movably coupled to the bracket and rotatably coupled to the energy storage member; and
a screw rotatably coupled to the bracket and threadedly engaged with the glider, the screw is adapted to translate the glider relative to the bracket when it is rotated;
wherein the adjustment mechanism is configured to change an angle between the energy storage member and the arm when the glider translates relative to the bracket.