Illumination – Supports – Adjustable light support
Patent
1980-10-21
1983-05-31
Lechert, Jr., Stephen J.
Illumination
Supports
Adjustable light support
362431, 362432, F21M 318
Patent
active
043863930
ABSTRACT:
A swivel with an adjustable frictional drag is disclosed. The swivel has a first member which has a first side wall surrounding a first axial cavity. The first side wall has a generally transverse bore which is connected to a first tubular lamp arm. The first side wall further has an annular engaging surface adjacent one end. A first end wall which has a first axial bore in communication with the first cavity is connected with the other end of the first side wall. A first bearing surface surrounds the first axial bore. The swivel further includes a second member which has a second side wall surrounding a second axial cavity. The second side wall has a generally transverse bore which receives a tubular lamp arm. The second side wall further has a second engaging surface adjacent one end for sliding engagement with the first engaging surface during relative rotational movement between the first and second members. A second end wall which has an axial threaded bore therethrough is connected with the other end of the second side wall. A swivel pin has a head portion at one end which engages the bearing surface of the first end wall and a threaded portion at its other end which engages the axially threaded bore. A set screw is received in the axial threaded bore for abutting the swivel pin to lock it and the axially threaded bore against relative rotation.
REFERENCES:
patent: 791548 (1905-06-01), Fischer
patent: 1712865 (1927-09-01), Allyn
patent: 2030006 (1935-06-01), Kelly
patent: 2234945 (1940-09-01), Baumbach
patent: 2365031 (1942-03-01), Wickens
patent: 2395178 (1946-02-01), Flori
patent: 2488898 (1949-11-01), Brasty
patent: 2582159 (1949-04-01), Race
patent: 4247886 (1981-01-01), Warshawsky
Italian Import Swivel hand drawn page.
Lechert Jr. Stephen J.
Pike Machine Products Company
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