Extension arm for an automobile jack

Claim 1

A jack arm comprising: a plurality of interconnected hollow tubular sections, comprising: a first end of at least a first said section and a second end of at least a second said section each having at least one straight side, said first end adapted to fit within said second end and to be keyed to said second end by said straight sides to resist torque applied thereto, and said first end having an inner wall; said second section also having a said first end; a first hole in said first end of said first section and a second hole in said second end of said second section, located in alignment with each other; and a fastener having a stop and two resilient legs splayed apart and extending from said stop, and a lug having side walls extending from said stop, said fastener snap fit within said first end of said first section with said resilient legs resiliently pressing against said inner wall to bias said lug out through and beyond said first hole with said stop abutting against an inner wall of said first section adjacent said first hole to limit the projection of said lug through and beyond said first hole, said lug projecting into said second hole of said second section and said side walls of said lug extending into and abutting the walls defining said second hole to lock said first and second sections together until said lug is depressed to release said second end for disassembly.