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A scissor jack

A jack and connector technology, applied in the direction of lifting devices, etc., can solve problems such as low lifting efficiency and mechanical failures

Inactive Publication Date: 2009-02-25
QUADDRO TECH PTY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] When heavy vehicles need to be lifted, the problems of low lifting efficiency and mechanical failure will be aggravated

Method used

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  • A scissor jack
  • A scissor jack
  • A scissor jack

Examples

Experimental program
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Embodiment Construction

[0014] Referring to the accompanying drawings, the scissor jack described in the present invention is generally indicated by reference numeral (1). The jack (1) has a base (2) and a load bearing frame (3). Four movable arms (4), (5), (6) and (7) are located between the above mentioned parts, which is a common structure for this kind of jack.

[0015] Slots are made in the arms (4), (5), (6) and (7) to fit some pins and two trunnions to hold the jack parts together.

[0016] Arms (4), (5), (6) and (7) form two elbow joints (8), each of which connects arm (4) via trunnions (9) and (10) and (6) and arms (5) and (7) are respectively hinged together to form. Wherein the trunnion (10) has an internally threaded hole. This thread matches the thread (11) on the shaft (12) and is interconnected via the threaded trunnion (10) of the shaft (12) with another trunnion, which is a driven trunnion with a smooth bore (9) A flange (13) on the shaft (12) is used to prevent it from passing t...

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PUM

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Abstract

The invention involves a scissor jack (1) having four arms (4,5,6,7) hingedly arranged to provide two opposite elbows (8) between a base (2) and a load support (3). A pair of trunnions (9,10) at the elbows (8) is connected by a threaded shaft (12). A movable brace (40) is supported between the arms (4-7). The brace (40) strengthens and adds support to the jack assembly (1). In a preferred embodiment, the brace (40) includes a guide assembly (30) which slidably engages the shaft (12) and connectors (41) pivoted between the guide (30) and each of the four arms (4,5,6,7). The connectors (41) are extensible socket (36) and rod (29) arrangements. Each connector (41) includes a coil spring (37) located over the rod (29) in the socket (36). The four springs (37) are compressed on extension of the jack (1) to assist in lifting a load.

Description

technical field [0001] The invention relates to a structural improvement of a scissor jack. Background technique [0002] Scissor jacks are well known and widely used for lifting vehicles. This type of jack is also sometimes called a screw jack. Its basic design and principles of operation have been in use for some time. [0003] The modifications made on these jacks are generally on the threaded shaft or on the trunnions that connect the threaded shaft to the component. Considerable force is required to lift a load with these jacks, or in other words, the lifting rate is reduced to reduce the force requirement. [0004] When jacks are used in the field they are usually subjected to more severe mechanical stress. These will increase the likelihood of structural damage to the component. [0005] The problems of inefficient lifting and mechanical failure are exacerbated when heavy vehicles need to be lifted. In addition to some larger 4WD vehicles that are commercially a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B66F3/12
Inventor C·克里斯蒂
Owner QUADDRO TECH PTY LTD