US 12,098,060 B1Granted

Hydraulic jack assemblies

AssigneeRoadtek Enterprises Inc.

InventorsDustin Nielson, Maggie Hu

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Abstract

Hydraulic jack assemblies are disclosed herein. The hydraulic jack assemblies may include a hydraulic unit base that includes a plurality of pump pistons to output hydraulic fluids with different characteristics that can be selectively used based on load conditions. The hydraulic jack assemblies may additionally or alternatively include a hydraulic fluid release valve that may be opened by an electrically powered driver.

Claims10

Dependent claims

A hydraulic jack assembly, comprising:

a hydraulic cylinder including a ram;
a hydraulic fluid tank;
a hydraulic unit base connected to the hydraulic cylinder and the hydraulic fluid tank and having a support structure body with a hydraulic fluid return channel disposed in the support structure body of the hydraulic unit base, the hydraulic fluid return channel having a first end and a second end opposite of the first end, wherein the first end of the hydraulic fluid return channel is located at a surface of the hydraulic unit base and the second end of the hydraulic fluid return channel is a closed-end;
a two-stage valve pin movably disposed in the hydraulic fluid return channel and having a first end and a second end opposite of the first end, the first end of the two-stage valve pin being nearer to the first end of the hydraulic fluid return channel than the second end of the two-stage valve pin, the two-stage valve pin includes a primary valve pin and a secondary valve pin, the primary valve pin movably disposed in a secondary valve pin cavity of the secondary valve pin, a push pin attached to an end of the primary valve pin, wherein the push pin extends out of a hole at an end of the secondary valve pin cavity when the primary valve pin is fully inserted into the secondary valve pin cavity;
a valve seat disposed in the hydraulic fluid return channel between the two-stage valve pin and the first end of the hydraulic fluid return channel to seat the first end of the two-stage valve pin when the two-stage valve pin is urged to mate with the valve seat, wherein when the primary valve pin is fully inserted into the secondary valve pin cavity and when the two-stage valve pin is seated on the valve seat, hydraulic fluid is prevented from flowing through the hydraulic fluid return channel;
and
a push rod movably disposed in the hydraulic fluid return channel and having a first end and a second end opposite of the first end, the first end of the push rod extending out of the hydraulic unit base through the first end of the hydraulic fluid return channel and the second end of the push rod to contact the push pin first before contacting the secondary valve pin when the push rod is urged towards the second end of the hydraulic fluid return channel.

4 more elements

Dependencies are inferred from the claim text.

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Abstract

A hydraulic jack assembly, comprising:

a hydraulic cylinder including a ram;
a hydraulic fluid tank;
a hydraulic unit base connected to the hydraulic cylinder and the hydraulic fluid tank and having a support structure body with a hydraulic fluid return channel disposed in the support structure body of the hydraulic unit base, the hydraulic fluid return channel having a first end and a second end opposite of the first end, wherein the first end of the hydraulic fluid return channel is located at a surface of the hydraulic unit base and the second end of the hydraulic fluid return channel is a closed-end;
a two-stage valve pin movably disposed in the hydraulic fluid return channel and having a first end and a second end opposite of the first end, the first end of the two-stage valve pin being nearer to the first end of the hydraulic fluid return channel than the second end of the two-stage valve pin, the two-stage valve pin includes a primary valve pin and a secondary valve pin, the primary valve pin movably disposed in a secondary valve pin cavity of the secondary valve pin, a push pin attached to an end of the primary valve pin, wherein the push pin extends out of a hole at an end of the secondary valve pin cavity when the primary valve pin is fully inserted into the secondary valve pin cavity;
a valve seat disposed in the hydraulic fluid return channel between the two-stage valve pin and the first end of the hydraulic fluid return channel to seat the first end of the two-stage valve pin when the two-stage valve pin is urged to mate with the valve seat, wherein when the primary valve pin is fully inserted into the secondary valve pin cavity and when the two-stage valve pin is seated on the valve seat, hydraulic fluid is prevented from flowing through the hydraulic fluid return channel;
and
a push rod movably disposed in the hydraulic fluid return channel and having a first end and a second end opposite of the first end, the first end of the push rod extending out of the hydraulic unit base through the first end of the hydraulic fluid return channel and the second end of the push rod to contact the push pin first before contacting the secondary valve pin when the push rod is urged towards the second end of the hydraulic fluid return channel.

4 more elements