Expandable jack

Details Expandable jack Expandable jack

1997-06-20

1999-02-02

Chin-Shue, Alvin

Fire escape, ladder, or scaffold

Self-sustaining

Having height adjustable platform

1821791, E04G 122

Patent

active

058652701

ABSTRACT:
An expandable jack that is stackable, is provided with four base members having vertical columns extending upwardly therefrom. A horizontal cross-member structure, having width adjustment capability, is adapted to slide along the height of a pair of vertical columns and once appropriately height positioned to be locked into place. One of the cross-members of the cross-member structure has height adjustment capability. The device permits quick and easy height or width adjustment and also permits quick and easy height adjustment of one or two horizontal cross-members.

REFERENCES:
patent: 2360999 (1944-10-01), Wyen
patent: 2599670 (1952-06-01), Thomas
patent: 3071204 (1963-01-01), Piltingsrud
patent: 3564802 (1971-02-01), Dreyfus
patent: 3684058 (1972-08-01), Brown
patent: 3850264 (1974-11-01), Salinas
patent: 4452337 (1984-06-01), Atzinger
patent: 5385215 (1995-01-01), Williams
patent: 5456334 (1995-10-01), Brignac

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