Patent ID: 6062404
Filing Date: 2000-05-16
Classification: B66C

Abstract:
A crane comprising:a telescopic jib having at least a first section and a second section;means for telescoping said second section along a longitudinal axis of said telescopic jib relative to said first section;a substantially smooth first surface formed on said first section;a substantially smooth second surface formed on said second section, said second surface having an inclination relative to said first surface, such that said second surface and said first surface are nonparallel; anda sliding element residing between said first surface and said second surface, said sliding element being movable between a first position on said second surface wherein said sliding element engages both said second surface and said first surface to arrest telescoping movement of said second section relative to said first section, and a second position along said second surface wherein said sliding element engages only one of said first and second surfaces and allows said second section to telescope relative to said first section.