US 6,986,503 B2 · Power unit for use with a jack stand that is convertible into a load-lifting jack

Abstract

A power unit comprises a rectangular chassis having a forward end and a rearward end and including a pair of parallel lift arms having rearward ends slidably mounted along the rearward end of the chassis, and a pair of connecting arms having forward ends pivotally mounted at the forward end of the chassis and having rearward ends pivotally mounted near the mid point of the lifting arms. The power unit further includes an actuator mounted at the rearward end of the chassis and attached near the mid point of the lift arms for translating the rearward ends of the lifting arms for raising and lowering the forward ends of the lift arms. The forward ends of the lift arms are typically for use with the jack stand for raising and lowering the jack stand, and are alternatively further for use with a lift bridge. A lift bridge is positionable on the forward ends of the lift arms whereby the power unit is operable directly for use as a load-lifting jack without the lift bridge; and the bridge is further displaceable from the forward ends of the lift arms whereby the power unit is operable for use with the jack stand.

Claims31

Dependent claims

A mobile jack stand power unit for use with a jack stand, that is convertible for use directly as a load-lifting jack without use of the jack stand, comprising:

a generally rectangular mobile chassis having a forward end and a rearward end;
a lift means mounted on said chassis including a pushing means, and a pair of parallel-lift arms having forward ends and rearward ends, with said pushing means for raising and lowering the forward ends of said lift arms, for use with the jack stand for raising and lowering the jack stand, and further for use with a lift bridge;
a lift bridge positionable on the forward ends of said lift arms whereby the power unit is operable directly for use as a load-lifting jack;
and said bridge is further displaceable from the forward ends of said lift arms whereby the power unit is operable for use with the jack stand.

1 more element

A mobile jack stand power unit for use with a jack stand, that is convertible for use directly as a load-lifting jack without use of the jack stand, comprising:

a generally rectangular chassis having a forward end for loading and unloading jack stands, a rearward end for maneuvering and controlling the power unit, a left flange and right flange extending upwardly from said chassis, with each flange having a longitudinal retaining means extending horizontally from the rearward end of the flange to about midway along the flange;
a lift arm assembly including a left lift arm and a right left arm acting in parallel having forward ends and rearward ends and interconnected near the midpoints thereof by a lateral pivotal push bar, and with the respective rearward end of said lift arms slidably retained within the respective longitudinal retainer means of said flange;
and with the forward ends of said lift arms extending toward the forward end of said chassis;
A left connecting arm and right connecting arm acting in parallel having forward ends and rearward ends with the respective forward ends of the connecting arms pivotally connected near the forward end of the respective flange, and with the respective rearward end of the connecting arms pivotally connected near the midpoint of the respective lift arm;
An extendable and retractable pushing means having a rearward end pivotally mounted to the rearward end of said chassis, and having a forward end attached to the lateral pivotal push bar;
so that when said pushing means is extended, the forward ends of said lift arms are raised and the rearward ends of said lift arms are translated forward along the longitudinal retainer means in the respective flange;
and
A lift bridge that is positionable on the forward ends of said lift arms so that the power unit is directly operable for use as a load-lifting jack;
and said bridge is further displaceable from the forward ends of said lift arms so that the power unit is operable for use with the jack stand.

6 more elements

Dependencies are inferred from the claim text.

Power unit for use with a jack stand that is convertible into a load-lifting jack

Life of this patent

Power unit for use with a jack stand that is convertible into a load-lifting jack

Life of this patent

Abstract

Claims31