An adjustment mechanism adjusts the counterbalance force applied by the counterbalance mechanism to the loading arm.

The lifting unit may include a hydraulic lifting mechanism and a counterweight mechanism.

A counterbalancing mechanism is disposed within the fluid passageway.

A counterweight mechanism (33) is provided in the first weight casing.

An overhead door apparatus (10) utilizing a torsion spring counterbalancing mechanism (30).

This mechanism can be used as a lifting force, a counter balancing mechanism or as a horizontal or other force mechanism.

The counterweight mechanism is equipped with a pair of connecting members (34) , a pair of weight support members (35) , a counterweight (36) , and a bolt (37) .

A counterbalance mechanism is connected between the loading arm and the swivel joint.

This mechanism can be used as a lifting force, a counter balancing mechanism or as a horizontal or other force mechanism.

The counterbalance mechanism includes a gas strut having a first end and a second end.

The lower sash (3) is connected to a counterweight mechanism (8) enabling same to move vertically in the window frame (1).

The counterbalancing mechanism (30) includes a worm drive ring-shaped gear winding mechanism (38) for setting the appropriate torque or number of winds in the spring (32).

A modular spring support mounting (24) for a sash window spring counterbalance arrangement (16).

The counterbalancing mechanism has a selectively adjustable level of tension that adjusts the amount of force required to rotate the tail relative to the body.

At least a portion of the counterbalancing mechanism can be selectively inserted into or removed from the fluid passageway through an opening in the body.