US 2025/0033939 A1Published application

Screw jack sleeve with improved stopping configuration

AssigneeVentra Group Inc.

InventorsHelon RZHEVSKY, Steven DEMOE, Murray DOBSON

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Abstract

A screw jack system with three (or more) stops that is capable of raising and lowering a substantially heavy load. Specifically, once the elevator sleeve travels through the case sleeve and is raised to its maximum height, the three (or more) inner stops of the elevator sleeve engage with the three (or more) outer stop channels of the case sleeve. These engagements are the stopping points of the screw jack which are the optimal points of support in order to prevent any lean from raising or lowering a heavy load or preventing any potential breaking points or sleeve pullout. Further, the screw jack system includes a pinion gear, drive gear, drive screw, elevator screw, and elevator tube that permit a user to covert rotational motion into linear motion in order to perform its desired raising and lowering functions.

Claims11

Dependent claims

A screw jack system comprising:

a base;
a case body having a drive gear to provide rotational motion;
a rotational input for driving the drive gear;
a drive screw perpendicular to said drive gear and rotatable therewith to convert rotational motion into linear motion;
a plurality of telescoping sleeves extendible and retractable relative to one another to permit vertical elevation,
a raising and lowering mechanism within said sleeves for extending and lowering comprising an internally threaded shaft meshed with the drive screw such that rotation of the drive screw raises and lowers the internally threaded shaft linearly to extend and retract the sleeves relative to one another;
wherein a bottom, first one of the sleeves is connected to the base and wherein an upper portion of the bottom, first one of the case sleeves and a lower portion of a second one of the elevator sleeves telescopingly received in the bottom, first one each have at least three stop mechanisms configured to engage one another on at least three locations when said elevator sleeve is fully extended with respect to the bottom, case sleeve to retain the elevator sleeve against withdrawal from the first case sleeve;
and
a load rest affixed atop said plurality of sleeves for engagement under a vehicle.

6 more elements

Dependencies are inferred from the claim text.