Swing arm lamp

Claim 1

In a combination swing arm lamp structure a round tubular stem extending vertically upward from a heavy base and protruding slightly into a recess at the bottom of said base; said stem serving as a sleeve bearing for an inner tube rotating within it and resting with a cap fastened to its top end on the open top end of said tubular stem and said cap supporting the entire swing arm linkage branching horizontally from it; said inner tube extending thru the entire length of said tubular stem and having a shoulder recess turned on its bottom end which protrudes slightly beyond the bottom end of said tubular stem when assembled together, and having a lug washer fastened to said shoulder recess; said lug washer having a protruding lug engaging on counter clockwise rotation, a stop pin in the bottom recess of said lamp base when the swing arms are folded up and extending toward the rear; said swing arm linkage comprising a tubular arm extending horizontally from said cap and terminating in the bottom portion of a swivel having a hole thru its center serving as a sleeve bearing for a tubular stem extending from the rotating top portion of said swivel whose rotation is confined to less than one revolution by means of stop pins mounted on the joint faces; one of said stop pins being mounted on the top face of said fixed bottom portion of said swivel and extending into an annular recess at the bottom face of said rotating top portion of said swivel where it engages a pin mounted in said recess for a positive stop of rotation; from said rotating top portion of said swivel extending horizontally, a tubular arm which terminates in a shallow drum-shaped box for intermediate electrical wire connections, said connection box also supporting the shaded lighting unit mounted to its top face; the location of said stop pins in the swivel in relation to the swing arm linkage being such that on clockwise rotation of said swivel a stop to the swing action is effected when the lower and upper swing arms are folded in closed position, that is, one above the other, the top and bottom portions of said swivel being held together with a minimum of end play by a flanged nipple screwed into the bottom end of said rotating tubular stem; for proper swing operation the direction of rotation of said inner tube of the lamp post being the opposite of the direction of rotation of said swivel portion; fastened to said cap connected to the top end of said inner tube a tubular handle which is open at its bottom end and extends downward amply clearing on rotation said tubular stem which extends upward from said stationary lamp base; said handle, said cap and said inner tube being fastened together for rotating in unison when swinging said interconnected lower swing arm, lifting the lamp by said handle arresting the primary swing action pivotally about said lamp stem permitting only said shaded lighting unit to be swung pivotally about said swivel thus preventing any uncontrollable flapping about of the swing arm linkage.