Jack extension tube

A jack extension tube for vehicles, comprising:

• an elongated tube having a first section and a second section spaced from said first section;
• a threaded member retained in said first section, said threaded member including threads adapted to be engaged longitudinally from one end of said tube by a jack screw, said threaded member including a knurled exterior surface contacting said first section of said tube, said first section being extruded inwardly onto said threaded member so that the material of said first section closely engages said threaded member to frictionally retain same therein;
• and
• said second section including sidewalls with material defining a pair of aligned, opposing apertures adapted to receive a fastener, said pair of apertures defining a direction transverse to the longitudinal direction of said tube, said material defining said apertures being extruded in the transverse direction so as to form opposing flanges defining enlarged cylindrically-shaped surfaces that provide an enlarged work-hardened bearing surface which increases the wear resistance and fatigue resistance of the second section when a fastener is received therein, said opposing flanges abutting so as to define a substantially continuous cylindrically-shaped surface, said material defining said apertures being extruded inwardly and then being reversed extruded so that said cylindrically-shaped surface extends outward of said sidewalls, said material defining said apertures including a raised embossment around said apertures on the exterior sides of said sidewalls.

A jack extension tube for vehicles, comprising:

• an elongated tube having a first section and a second section spaced from said first section;
• a threaded member retained in said first section, said threaded member including threads adapted to be engaged longitudinally from one end of said tube by a jack screw;
• said second section including material defining a pair of aligned, opposing apertures adapted to receive a fastener, said pair of apertures defining a direction transverse to the longitudinal direction of said tube, said material defining said apertures being extruded in the transverse direction so as to form opposing flanges defining enlarged cylindrically-shaped surfaces that provide an enlarged work-hardened bearing surface which increases the wear resistance and fatigue resistance of the second section when a fastener is received therein;
• and
• a jack screw operably threadably extending into said threaded member, said jack screw including an exposed end defining a gear and an opposite end configured so that said jack screw is retained in said threaded member and cannot be fully unscrewed from said threaded member.

A jack extension tube for vehicles comprising:

• an elongated tube having a first section and a second section spaced from said first section, said first section defining a first inner diameter;
• a threaded member located in said first section, said threaded member including threads adapted to be engaged longitudinally from one end of said tube, said threaded member including a knurled outer surface defining a second diameter about equal to said first inner diameter, said threaded member being frictionally retained in said first section by said first section being inwardly extruded onto said threaded member such that said first section is forced into close engagement with said knurled outer surface;
• and
• means for securing a fastener to said second section, said means for securing including inwardly extruded opposing flanges forming a pair of apertures.

A jack extension tube for vehicles comprising:

• an elongated tube having a first section and a second section spaced from said first section, said first section defining a first inner diameter;
• a threaded member located in said first section, said threaded member including threads adapted to be engaged longitudinally from one end of said tube, said threaded m ember including a knurled outer surface defining a second diameter about equal to said first inner diameter, said threaded member being frictionally retained in said first section by said first section being inwardly extruded onto said threaded member such that said first section is forced into close engagement with said knurled outer surface;
• means for securing a fastener to said second section;
• and
• a jack screw operably threadably extended into said threaded member, said jack screw including an exposed end defining a gear and an opposite end configured so that said jack screw is retained in said threaded member and cannot be fully unscrewed from said threaded member.