| 摘要 |
PROBLEM TO BE SOLVED: To provide a slider for a screw jack, having excellent toughness and lifting/sliding performance, suited for mass production, of low cost, and mainly used for automobiles, and to provide its manufacturing method. SOLUTION: This screw jack comprises, at least, a gear case, a small bevel gear bearer, a ram case, a bed, a thrust ball bearing, a small bevel gear, a large bevel gear, a main spindle threaded rod, an intermediate screw, an inner ram, an outer tube, and a handle joint. The ram case is formed so that it is outwardly swelled into a U-shaped cross-section, by a required width and by a required height, in a 180°staggered manner, and that ram case protrusive edges are on the outer surface side and ram case recess grooves are on the opposite inner surface side. The outer tube is formed so that it is outwardly swelled into a U-shaped cross-section and into a shape slidably conforming and fitting to the recess grooves of the ram case, and that outer tube protrusive ridges are on the outer surface side and outer tube recess grooves are on the inner surface side. The outer circumferential surfaces of the inner ram are formed into inner ram protrusive ridges slidably conforming and fitting to the recess grooves by in a 180°staggered manner, by upraising a required width and by a required height. COPYRIGHT: (C)2004,JPO
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