Screw bar for a pantograph-type jack

Details Screw bar for a pantograph-type jack Screw bar for a pantograph-type jack

1985-12-27

1987-09-22

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Single throw lever

Mechanically actuated

B66F 322

Patent

active

046950362

ABSTRACT:
A screw bar for connecting a nut member and a bearing member of a pantograph-type jack includes a cylindrical-shaped bar member having a joint portion formed integrally with the bar member at one end and a threaded portion formed integrally on the bar member at the other end. The nut member of the jack is threadably engageable with the threaded portion of the screw bar, and the bearing member of the jack is pivotally mountable on the bearing support portion of the screw bar. The maximum outer diameter of the threaded portion is less than or equal to the desired diameter of the bearing support portion so that the bearing member can be mounted on the screw bar from the threaded-portion end. Preferably, the joint portion includes a flange portion having an outer diameter greater then the desired diameter and the bearing support portion is provided with a lug portion. The lug portion and the joint portion are positioned on opposite sides of the bearing member mounted on the bearing support portion to prevent axial movement of the bearing member. A method for forming the screw bar also is disclosed.

REFERENCES:
patent: 1576721 (1926-03-01), Conrad
patent: 2467657 (1949-04-01), Brown
patent: 3906777 (1975-09-01), Dickens
patent: 4549721 (1985-10-01), Stone

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