초록 ▼

A jack extension tube preferably for vehicles is provided which comprises an elongated tube with a threaded nut securely mounted therein, and a jack screw received in an open end of the tube and threadably received in the threaded nut. The tube has a first flange extending inwardly adjacent an inner

A jack extension tube preferably for vehicles is provided which comprises an elongated tube with a threaded nut securely mounted therein, and a jack screw received in an open end of the tube and threadably received in the threaded nut. The tube has a first flange extending inwardly adjacent an inner end of the threaded nut and a second flange extending inwardly adjacent an outer end of the threaded nut whereby the threaded nut is securely retained within the elongated tube between the first and second flanges. The threads on the threaded nut can be involute threads to reduce noise, wear and chucking between the nut and the screw. The threaded nut can be formed of a rigid synthetic resin material. Further, a stop can be provided on one of the jack screw inner end and the threaded nut inner end whereby the stop prevents the threads on the jack screw from being separated from the threads on the threaded nut during rotation of the jack screw relative to the threaded nut and allowing for a low starting torque when the screw is rotated in a reverse direction.

대표청구항 ▼

[ What is claimed is:] [1.]1. In a jack extension tube for vehicles comprising:an elongated tube having a first section with an open end and a second section spaced from the first section;a nut mounted in the first section and having a threaded bore extending between front and rear faces, the nut fi

[ What is claimed is:] [1.]1. In a jack extension tube for vehicles comprising:an elongated tube having a first section with an open end and a second section spaced from the first section;a nut mounted in the first section and having a threaded bore extending between front and rear faces, the nut fitting snugly within the elongated tube;a mounting flange in the second section adapted to receive a fastener; anda jack screw received in the first section open end and threadably received in the threaded bore of the nut, the jack screw including an exposed end defining a gear and an opposite end configured with a stop so that the jack screw is retained in the threaded nut and cannot be fully unscrewed from the threaded nut;the improvement comprising:the nut and the tube are of complementary multi-sided cross section; andthe tube has a first flange extending inwardly in abutting relationship to the rear face of the nut and a second flange extending inwardly in abutting relationship with front face of the nut to prevent axial movement of the nut within the elongated tube;whereby the nut is securely retained within the elongated tube between the first and second flanges.