US 2209008 A
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July 23, 194o.
A. K. 1 SUTHERLAND 2,209,008
MOUNTING FOR ELECTRIC FIXTURES Filed Oct. 1. 1958 INVENTOR A. K. SUTHERLAND 16 BY gmmkuu ATTORNEY Patented July 23, 1940 UNITED STATES PATENT OFFICE MOUNTING FOR ELECTRIC FIXTURES Alexander K. Sutherland, Milwaukee, Wis., as-
signorto Moe-Bridges Corporation, Milwaukee, Wis., a corporation of Wisconsin Application October 1,
This inventionrelates to mountings for electric fixtures such as light fixtures, and it has among its objects a light fixture mounting equipped with a simple and cheap clamping support for a globe or similar hollow enclosure forming a part of the assembled fixture so as to permit quick and easy removal of the enclosure from its permanent positionfor cleaning or exchanging, and quick and simple clamping of the enclosure in its location.
The foregoing and other objects of the invention will be best understood from the following description of exemplifications thereof illustrated in the accompanying drawing; wherein Fig. l is a vertical sectional view of a lighting fixture mounting exemplifying the invention; I
Fig. 2 is a view along line 2--2 of Fig. l with parts of the globe and the cam extension broken away;
Fig. 3 is a View along line 3-3 of Fig. 1;
, Fig.4 is a top view of the central portion of the fixture; and
Fig. 5 is a View similar to Fig. 1 illustrating another exemplification of the invention.
Referring to Figs. 1 to 3, an electric fixture, such as a lamp, is supplied through an electric cord looped through a supporting chain I2, attached to the ceiling for instance, for carrying a socket support in the form of a U-shaped bail I3 to which is clamped a lamp socket Hi holding the lamp bulb |5 which is energized by the cord The lamp is enclosed by an enclosure, such as a translucent globe I6, which is carried by a clamping member in the form of a sheet metal shell slidably mounted on the socket supporting bail wires I3 and provided with a flanged rim portion 8 against which the border l9 of the globe is held clamped by a plurality of pivotally 40 mounted clamping arms 2|. Each clamping arm 2| is formed of a wire bent to assume the U- shaped formation shown in Figs. 1 and 2, the ends of the wire being outwardly bent to form pivot projections 22 which are pivoted on the side portions of re-entrant U-shaped loops 24 formed in a split annular spring wire 25 shaped and compressed to the form shown in Fig. 3 so as to remain clamped under its spring action within the retainer groove 26 formed adjacent the 50 periphery of the top wall of the shell. 7
The freely swinging clamping arms 2| rest against a cam edge surface 21 of a cam member 28 in the form of a sheet metal cup extending from the socket support l3 of the lamp fixture, being, for instance, secured to the socket support 1938, Serial No. 232,837 (01. 240--133) by screws 29. In the position shown in Fig. 1, the cam surface 21 forces the clamping arms 2| against the shell rim l8 for clamping the border of the globe. On lifting the slidable shell on its bailsupport l3, the cam surface 2'! of the canr extension 28 releases the clamp-arms 2| from their clamping engagement shown in full lines in,
drop on its sliding bail support and the cam surface of the socket support extension 28 will swing the clamping arms from the dotted line position 2| to their full line clamping position shown in Fig. 1.
After the lamp has been replaced or the in terior of the fixture or globe cleaned, the globe may be quickly replaced by simply lifting the clamping shell I! on its bail support I3, and this upward movement of the clamping shell causes the clamping arms 2| carried by the shell ll to be lifted to the dotted line position 2|. Thereupon, the globe may be easily positioned against the clamping rim l8 of the clamping shell H, and the clamping shell is lowered while simultaneously the socket cam extension 21 forces the clamping arms 2| to their clamping position in which they clamp the border of the globe to the rim of the shell; serving to hold the clamping shell I! and its clamping arms 2| in lower clamped position shown in Fig. 1.
Theshell may be locked in its clamping position shown in Fig. 1, by a circular latch member 3 of sheet metal rotatably mounted on the circular edge portion of its bail guide slot in the way shown in Fig. 4 so as to engage a lock,
projection 4 pressed out from one of the bail wires I3. The latch 3 has a grip arm 5 forturning it till its slot 6 is brought into alignment with the lock projection 4 for releasing the shell This cooperative relation between the clamping shell I! with its clamping arms 2| and the socket support with its cam extension 28, makes it possible to utilize thus the weight of the shell clamping rim of the clamping shell, no entanglement or jamming of the clamping elements can take place while removing or mounting the globe in its place.
In Fig. 5 is shown another exemplification of the invention. On a ceiling canopy 30 of an electric ceiling fixture, suitably secured over the ceiling outlet, is provided a socket support ti on which is mounted a socket M with an electric bulb l5 as in Fig. 1. A globe clamping member in the form of a metallic shell 33 is slidably mounted on the socket support 3| for movement from the downward full line position to the upward dotted line position 33'. The clamping shell carries on a wire spring 25, similar to that of Fig. l, a plurality of wire clamping arms 2i for clamping the globe it between the clamping rim of the clamping shell 33 and the three ends of the clamping arms 2|. As in the arrangement of Fig. l, the socket support 3i is provided with a cam extension 28 having a cam edge 2"! which slidably engages the clamping arms 2i so as to force them to the full line clamping position shown in Fig. 5 when the clamping shell is in its downward position and to release the clamping arms to the dotted lineposition and permit easy and quick removal of the globe from the lamp fixture when the clamping shell 33 is lifted along its sliding engagement surface with the socket support 3i to the dotted line position.
A latch projection l of a latch spring riveted to the socket support 3| at 8 extends through a slot 9 of the shell 33 to automatically lock the shell when it is lowered to its clamping position shown in Fig. 5 and to release the shell when the latch projection l is pressed inwardly.
Many other modifications of the invention will suggest themselves to those skilled in the art. It is accordingly desired that the appended claims be given broad construction commensurate with the scope of the invention.
I claim: 1
1. In a mounting for electric light fixtures or the like, a forwardly projecting support, a hollow clamping member slidably movable on said support between a rearward and a forward position, and having a clamping rim for clamp-ing engagement with the border of a hollow enclosure extending around the space in front of said support, a deformed spring member loop clamped by its outwardly acting spring force against a portion of the inner surface of said clamping member, a plurality of clamping arms pivotally carried by peripherally spaced portions of said spring member so as to swing freely in radial directions when the clamping member is in its rearward position, and a cam member extending from said support having an exposed peripheral cam surface arranged to slidably engage and radially press the inner surfaces of said arms so as to swing them outwardly toward said rim during forward sliding motion of said clamping member on said support, said support, said clamping member, and the associated cam surface and clamp arm elements being so shaped and arranged as to force said arms toward said clamping rim for clamping said enclosure border when said clamping member is in the forward position on said support, and to release said arms from their clamping position and permit the free removal of said enclosure from its clamping engagement when said clamping member is slid toward its rearward position on said support.
2. In a mounting forelectric light fixtures or the like, a downwardly projecting support, a hollow clamping member slidably movable on said support between an upward and a downward position, and having a clamping rim for clamping engagement with the border of a hollow enclosure extending around the space in front of said support, a deformed spring wire loop clamped by its outwardly acting spring force against a portion of the inner surface of said clamping member and having a plurality of peripherally spaced inwardly bent portions, a plurality of clamping arms pivotally carried by said inwardly bent portions'of said spring member so as to swing freely in radial directions when the clamping member is in its upward position, and a cam member extending from said support having an exposed peripheral cam surface arranged to slidably engage and radially press the inner surfaces of said arms so as to swing them outwardly toward said rim during forward sliding motion of said clamping member on said support, said support, said clamping member, and the associated cam surface and clamp arm. elements being so shaped and arranged as to force said arms toward said clamping rim for clamping said enclosure border when said clamping member is in the downward position on said support, and to release said arms from their clamping position and permit the free removal of said enclosure from its clamping engagement when said clamping member is slid toward its upward position on said support.
ALEXANDER K. SUT'HERLAND.