Patent ID: 6494636
Filing Date: 2002-12-17
Classification: A63C,E01F,E04H,F16B,Y10T

Abstract:
An extendible and retractable support device comprising:(a) a first member defining an axially extending tubular interior, said first member having an upper and a lower end; (b) a key receiver sleeve in the interior of said upper end of said first member, said key receiver sleeve defining a key slot having a generally axial riser slot portion, a transverse key reception slot portion and a key end reception slot portion; (c) a second member having a generally cylindrical exterior and telescopically slidably within said key receiver sleeve and said first member, said second member having opposite first and second ends; (d) a key sleeve on the exterior of the lower end of the second member end, said key sleeve having an axial riser, a transverse key section and an axial key end, said key sleeve and key receiver sleeve having substantially the same diameter whereby said second member is guided by said sleeves as it telescopically slides; and (e) whereby said second member can be axially extended from a substantially fully retracted position bringing said key sleeve and key slot into axial alignment and thereafter rotated to cause said key end to seat in said key end reception slot thereby locking the members in an extended position and against rotation.