Patent ID: 9061871
Filing Date: 2015-06-23
Classification: B66F,F16C

Abstract:
1. A mast assembly for a forklift truck, comprising: an outer mast including a pair of right and left uprights each mounted upright on the front of a truck frame of the forklift truck and each having inner guide surfaces; an inner mast including a pair of right and left uprights each received in the corresponding one of said pair of right and left uprights of said outer mast for elevational movement and each having inner guide surfaces and outer guide surfaces; a carriage assembly having a pair of right and left bracket plates each received in the corresponding one of said pair of right and left uprights of said inner mast for elevational movement; a first guide unit fixed onto said inner guide surfaces of each said upright of said outer mast and being in contact with said outer guide surfaces of the corresponding said upright of said inner mast so as to guide said inner mast for elevational movement; a second guide unit fixed onto said outer guide surfaces of each said upright of said inner mast and being in contact with said inner guide surfaces of the corresponding said upright of said outer mast so as to guide said inner mast for elevational movement; and a third guide unit fixed onto each said bracket plate and being in contact with said inner guide surfaces of the corresponding said upright of said inner mast so as to guide said carriage assembly for elevational movement; the front wall has an inner surface and an outer surface, the outer surface defining a sliding contact surface which is in sliding contact with one of said outer guide surfaces of said pair of uprights of said inner mast, said inner guide surfaces of said pair of uprights of said outer mast, and said inner guide surfaces of said pair of uprights of said inner mast; and the sliding pad member further includes a pair of reinforcement ribs formed on the inner surface of said front wall and extending along diagonal lines of the rectangular sliding surface and crossing at the center of the rectangular sliding surface, and the block shaped body includes a pair of ring-shaped tabs, where one tab is formed within each wall of the first set of opposing side walls of said block-shaped body, said tabs each having a through hole for receiving a screw for fixing said block-shaped body onto one of said inner guide surfaces of said pair of uprights of said outer mast, said outer guide surfaces of said pair of uprights of said inner mast, and the surfaces of said pair of bracket plates, and the head of the fixing screw is at a level lower than that of the sliding contact surface.