US 4,726,552 A · Lamp swivel

Abstract

A swing arm lamp has the swing arms thereof connected to each other through a swivel assembly that includes a pair of end swivel elements and a center swivel element all disposed proximate each other and interconnected so as to rotate with respect to each other about an axis of rotation through the swivel assembly, but so that relative sliding movement along the axis of rotation of the elements with respect to each other is substantially prevented. The elements are formed of tubular stock with the center element having reduced outer diameter at each end thereof and having a circumferential groove formed about each such reduced outer diameter. The reduced outer diameter end portions of the center element, in turn, seat respectively in enlarged inner diameter end portions of the end elements. A lug is formed from the material of each such end element by displacing the wall thereof in a swaging process. The lugs are so formed to project into their respective circumferential groove and coact with the side walls thereof, but so as to permit the rotational movement and prevent the relative sliding movement. In an alternate embodiment only two swivel elements are utilized; a first like the end element and the second like the center element but with only one reduced end and groove.

Claims19

Dependent claims

A swivel assembly for a lamp;

comprising:
(a) first swivel means;
(b) second swivel means;
and
(c) interconnection means carried by said first swivel means and said second swivel means to interconnect said first swivel means and second swivel means for relative rotational movement with respect to each other about an axis of rotation passing through the swivel assembly, but so as to substantially prevent relative sliding movement of said first swivel means away from said second swivel means along said axis of rotation;
(d) said interconnection means including a circumferential groove with side walls formed in an outer surface of said second swivel means, and a lug deformed from the material of said first swivel means by displacing the material of a wall thereof said lug for projecting into said groove and for coacting with said side walls for substantially preventing said sliding movement along said axis of rotation.

3 more elements

The method of forming a swivel assembly for a lamp;

comprising the steps of:
(a) forming a first swivel means;
(b) forming a second swivel means;
and
(c) forming interconnection means between said first swivel means and said second swivel means to interconnect said first swivel means and second swivel means for relative rotational movement with respect to each other about an axis of rotation passing through the swivel assembly, but so as to substantially prevent relative sliding movement of said first swivel means away from said second swivel means along said axis of rotation;
(d) said interconnection means being formed by forming a circumferential groove with side walls formed in an outer surface of said second swivel means, and by forming a lug formed from the material of said first swivel means by displacing the material of a wall thereof so as to project into said groove and so as to coact with said side walls thereof to so substantially prevent said sliding movement along said axis of rotation.

3 more elements

Dependencies are inferred from the claim text.

Lamp swivel

Life of this patent

Lamp swivel

Life of this patent

Abstract

Claims19