Elevator – industrial lift truck – or stationary lift for vehicle – Industrial lift truck or required component thereof – Having specific drive-means for load support
Patent
1996-11-12
1999-03-09
Bucci, David A.
Elevator, industrial lift truck, or stationary lift for vehicle
Industrial lift truck or required component thereof
Having specific drive-means for load support
187226, 187267, 187268, B66F 920
Patent
active
058788441
ABSTRACT:
An automated guided vehicle for carrying a load comprises a mast, a lift carriage, a ball screw drive assembly and a ball screw joint. The ball screw drive assembly has a lift nut and a vertically oriented ball screw. The ball screw joint operatively couples the drive assembly to the lift carriage so as to transmit upward vertical forces from the drive assembly to the lift carriage. The ball screw joint includes first, second, third and fourth shafts which permit the lift nut to move in any horizontal direction and to pivot about any horizontal axis with respect to the lift carriage. As a result, the ball screw joint advantageously prevents the transmission of horizontal forces and angular moments between the ball screw and the lift nut, thereby reducing the wearing out effects of component misalignment on the ball screw assembly.
REFERENCES:
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patent: 2188686 (1940-01-01), Kersting et al.
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patent: 3568804 (1971-03-01), Olsen
patent: 3688920 (1972-09-01), Frish
patent: 4782920 (1988-11-01), Gaibler et al.
Power Trac Design Guide, Rolled Thread Ball Screws & Mounting Blocks Nook Industries, 1990. pp. 3-39.
Carter Paul T.
Gines Paul K.
Bucci David A.
HK Systems Inc.
McAllister Steven B.
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