초록 ▼

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 pos

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.

대표청구항 ▼

[ We claim:] [1.] An expandable jack having a generally rectangular shape with four corners, and a pair of lengths, a pair of widths, and a height comprising:a first pair of base members located at the two corners that define the first width and a second pair of base members located at the remaining

[ We claim:] [1.] An expandable jack having a generally rectangular shape with four corners, and a pair of lengths, a pair of widths, and a height comprising:a first pair of base members located at the two corners that define the first width and a second pair of base members located at the remaining two corners that define the second width;a first pair of vertical columns extending upwardly from each of the first pair of base members and a second pair of vertical columns extending upwardly from each of the second pair of base members;a first horizontal cross-member structure, having a first width adjustment means, disposed between the first pair of vertical columns and a second horizontal cross-member structure, having a second width adjustment means, disposed between the second pair of vertical columns;the first horizontal cross-member structure and the second horizontal cross-member structure each comprising:a first vertical stable column;a first horizontal column, having a hollow interior, extending outwardly from the first vertical stable column proximate its top;a second horizontal column, having a hollow first end, attached to the first vertical stable column in T-formation fashion;a first hollow collar, attached to the second end of the second horizontal column, adapted to slide on one of the vertical columns;a first securement means for securing the second horizontal column to the one of the vertical columns;a second vertical stable column having a hollow interior adapted to slide on another of the vertical columns;a third horizontal column extending outwardly from the top of the second vertical stable column adapted to slide within the first horizontal column;a second securement means for securing the third horizontal column to the first horizontal column;a fourth horizontal column adapted to slide within the second horizontal column;a third securement means for securing the fourth horizontal column to the second horizontal column;a fifth horizontal column, having a second hollow collar, attached to the first end of the fifth horizontal column adapted to slide on the one of the vertical columns and a third hollow collar attached to the second end of the fifth horizontal column adapted to slide on the first vertical stable column;a fourth securement means for securing the fourth horizontal column to the one of the vertical columns; anda fifth securement means for securing the fifth horizontal column to the first vertical stable column.