Jack of a pantograph type (II)

Details Jack of a pantograph type (II) Jack of a pantograph type (II)

1987-03-19

1988-09-20

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Single throw lever

Mechanically actuated

B66F 308

Patent

active

047719869

ABSTRACT:
This invention relates to a jack of a pantograph type, especially to the improvement of pivot joint mechanism of jack comprising screw nut body engaged with screw, metal body having screw bearing hole and end portions of a pair of upper and lower grooved links, and constituted by combining the upper and the lower grooved links with the screw block in which the screw block having unidiameter passes through an inserting hole formed on two side wall portions of end portions of the upper and lower grooved links to extend the two end portions of screw block for projecting outwardly. In this state, a plurality of projections for stopping are formed by plastic working with separating each other around axial periphery on the portions of screw block adjacent to inner and outer face of two side wall portions of the upper and lower grooved links respectively.

REFERENCES:
patent: 2260048 (1941-10-01), Newell
patent: 3164054 (1965-01-01), Biesecker
patent: 3231300 (1966-01-01), Moroney
patent: 4382744 (1983-05-01), Klem et al.
patent: 4583713 (1986-04-01), Fukura et al.
patent: 4586696 (1986-05-01), Mugford et al.

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