US 4,645,181 AGranted

High performance air jack

OwnerLloyd D. Schapanskyinventor

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Abstract

The disclosure describes an air jack with features that permit a substantial increase in performance during operation. A load engaging bracket includes a telescoping connection with rollers so that the connection will extend readily under loaded conditions without the air jack being subjected to forces that would tend to tilt it or otherwise move it. The ground-engaging member has sides that are positioned apart to define a dimension greater than the fully retracted load-engaging bracket to permit the bracket to lower between the sides thereby defining a minimum down height. An air manifold is positioned to furnish air under pressure not only for operating the air jack but for operating a number of air tools that are associated with the need for the air jack. The air jack has pockets to hold these tools when they are not being operated.

Claims15

Dependent claims

A high performance air jack, comprising:

an axle having a predetermined length and including wheel means mounted rotatably at each end of said predetermined length;
a vertical member extending from said axle and terminating in a piston member;
cylinder means having a closed upper end and an open lower end is disposed moveably in air-sealing relationship with said piston member;
means to detachably affix an air suppy hose to said cylinder means for receiving a source of air under pressure;
a load-bearing bracket having two tubular arms attached one arm to each side of said cylinder means with three tubular sections in a generally pi configuration, two of said sections fitting in a telescoping relationship with said tubular arms with the third of said three sections affixed to said two telescoping sections with two load-engaging members to define a predetermined distance when fully retracted;
and
elongated ground-engaging, jack-stabilizing means with side elements affixed to said axle and extending therefrom in a spaced apart relationship to define a distance at least as great as said predetermined distance.

4 more elements

A high performance air jack, comprising:

means to define an axle of predetermined length including rotatable means supported thereby;
vertical means extending from said means to define an axle to support piston means;
cylinder means having a closed upper end and an open lower end disposed moveably over said piston means;
air manifold means including means to define a plurality of holes to attached air hoses and means to communicate air under pressure within said air manifold means to said cylinder means above said piston means;
and
load-engaging means including means to engage a load to be raised and telescoping means to support said means to engage a load from said cylinder means;
said telescoping means comprising:
three tubular members formed in a generally H configuration, with two members supported from said cylinder means and a third member affixed between the two members;
and
three tubular sections formed in a generally pi configuration, two of said sections fitting in a telescoping relationship with said two members and the third section affixed to said two telescoping sections.

7 more elements

Dependencies are inferred from the claim text.