Lift assembly

A lift assembly comprising:

• a base member;
• a lift member adapted for selective movement toward and away from the base member;
• first and second support arms interconnecting the base member and the lift member and defining a generally trapezoidal arrangement;
• means for accommodating tolerance stackup such that any two adjacent sides of the generally trapezoidal arrangement is substantially equal to the remaining two adjacent sides.

A lift assembly comprising:

• a base member;
• a lift member adapted for selective raising and lowering relative to the base member;
• means for selectively locking the lift member at a preselected height above the base member;
• and
• means for sensing that said locking means is properly oriented and that the lift member is loaded, the sensing means including a lock bar having a series of notches therein adapted to receive a lock arm interposed between the lift member, and a fluid actuator that selectively rotates the lock bar.

A lift assembly comprising:

• a base member;
• a lift member operatively connected to the base member;
• means for selectively moving the lift member toward and away from the base member;
• a bar having plural notches spaced in non-linear relationship for receiving a lock arm associated with the lift member and provide uniform incremental lift heights of the lift member;
• and
• means for indicating orientation of the notched bar for receipt of the lock arm.

A lift assembly comprising:

• a base member;
• a lift member;
• first and second arms linking the base member and lift member together;
• and
• each arm connected too the lift member through a segmented bearing that permits complete transfer of compressive and tensile forces through and accommodates tolerance build up between the arms, base member and lift member.

A lift assembly comprising:

• a base member;
• a lift member operatively connected to the base member;
• means for selectively moving the lift member toward and away from the base member;
• first and second lift jack assemblies associated with the lift member for raising and lowering loads relative to the lift member, the lift jack assemblies being operated by first and second electric motors;
• and
• means for rectifying and alternating current into a reduced voltage, pulsating direct current to synchronously operate the first and second motors.

A lift assembly comprising:

• a base member;
• a lift member operatively connected to the base member;
• means for selectively raising and lowering the lift member relative to the base member;
• a lift jack assembly having a single acting fluid cylinder operated by a bi-directional pump, the lift jack assembly being associated with the lift member for raising and lowering loads relative to the lift member;
• and
• means for operating the pump in reverse without cavitating the pump to retract the fluid cylinder.

A lift assembly comprising:

• a base member;
• first and second lift platforms operatively connected to the base member;
• means for selectively moving the lift platforms toward and away from the base member;
• and
• means for synchronizing movement of the first and second lift platforms relative to the base member, the synchronizing means including a shaft extending between the lift platforms and means for sensing height differential between the lift platforms wherein said synchronizing means equalizes the lift platforms if the height differential is limited and terminates in movement of the lift platforms if the limited height differential is exceeded.