CA2146066A1

CA2146066A1 - Trim retainer

Info

Publication number: CA2146066A1
Application number: CA002146066A
Authority: CA
Inventors: William Winkelhake
Original assignee: Cooper Industries LLC
Current assignee: Cooper Industries LLC
Priority date: 1994-05-02
Filing date: 1995-03-31
Publication date: 1995-11-03
Also published as: US5868493A; US5597234A

Abstract

This invention relates to an improved lighting fixture of the type which may use a trim-ring connected to the bottom of a lighting fixture housing can and is applicable to lighting fixtures of either the recessed variety or of the track variety. In most of such housings, portions of the sheet metal walls are punched out and deflected inwardly forming lugs, or auxiliary brackets are welded to the inside of the housing, to support such baffles, trim-ring means or other assembly means. Such lugs, or brackets, generally have extremely sharp burr edges. The means used for fastening the trim rings or other means to such lugs generally are well known and are usually either torsion springs or tension springs.
In each instance, it is necessary for the installer to insert his hands into the interior of the can to install the secondary retaining spring members and thereby expose his hands to the sharp burrs on the edges of the sheet metal lugs used to support the retaining spring members. The present invention provides an improved trim-ring and baffle mounting system for a simplified assembly and retention system for aesthetic auxiliary items. There is provided an internal support system for the housing of a can-type lighting fixture that is simple in construction and can be assembled rapidly at the point of installation. This can be adjusted axially to a plurality of positions in a simple and effective manner without the use of external fastening means such as screws and without the problem of confronting sharp burr-like edges of sheet metal projecting into the interior of the can-like housing.

Description

, 2l~6n~6 TRIM RET~ T~
BAC~GROI~ND OF l~IE lNV~iNLlON
Lighting fixtures, be they of the recessed or track variety, generally include a cylindrical can-like housing for enclosing the ~ight source, the socket, wiring, baffle or reflector, and trim means for decoratively covering the open end of the can.
In most of such housings, portions of the sheet metal walls are punched out and deflected inwardly forming lugs, or auxiliary brackets are welded to the inside of the housing, to support such baffles, trim-ring means or other assembly means. Such lugs, or brackets, generally have extremely sharp burr edges. For two such examples, in the patent issued to Lester Gilman, U.S. Patent No.
4,336,575, see lugs 62, and in the patent issued to Earl F.
Miles, Jr., U.S. Patent No. 3,660,651, see mounting 68 welded to the interior wall and projecting inwardly from housing 21. Such lugs are rigidly fixed to the wall of the can-like housing and unless there are a plurality of axially spaced lugs there is little or no choice in the selection of support means.
The means used for fastening the trim rings or other means to such lugs generally are well known and may be either torsion springs such as spring 99 in the patent to Miles, set forth above, or tension springs (not shown) described in Column 3, lines 26-29, in the patent to Gilman, set forth above. In each instance, it is necessary for the installer to insert his hands 21460~g into the interior of the can to install the secondary retaining spring members and thereby expose his hands to the sharp burrs on the edges of the sheet metal lugs used to support the retaining spring members.

BRIEF DESC~IPTION OF lNV~NllON
This invention relates to an improved lighting fixture of the type which may use a trim-ring connected to the bottom of a lighting fixture housing can and is applicable to lighting fixtures of either the recessed variety or of the track variety.
It is a primary object of the present invention to provide an improved trim ring and baffle mounting system for a simplified assembly and retention system for such aesthetic auxiliary items.
It is a further object of the present invention to provide an internal support system for the housing of a can-type lighting fixture that is simple in construction and can be assembled rapidly at the point of installation.
Another object of the present invention is to provide either a recessed or a track type of lighting fixture having internal support means, for retention of a trim ring or deflector means, which can be adjusted axially to a plurality of positions in a simple and effective manner without the use of external fastening means such as screws and without the problem of confronting sharp burr-like edges of sheet metal projecting into the interior of the can-like housing.

21~60S6 Still another object of the present invention is to provide a lighting fixture housing that has a substantially smooth interior wall, portions of the wall having at least one annular concave groove opening inwardly in axially spaced transverse planar relation from the open end of the can and a retaining spring means having complimentary engaging means of such a configuration that a substantial portion of the engaging means of the spring may be positioned within said groove and thereby axially retained.
An additional novel element resides in the configuration of the retaining spring means in combination with the wall groove in the housing interior wall.
A further feature, in another embodiment, is the provision of at least one aperture opening outwardly through said at least one annular groove and said spring means including a complimentary element for engaging said aperture, engagement of said spring with said groove provides an axial restraint while engagement by said complimentary element in said aperture provides a rotational restraint as well as giving said spring a positive orientation.
Another feature of the present invention is to provide a lighting housing can having a generally smooth interior wall except for at least one substantially continuous annular concave groove opening inwardly and disposed in a plane generally perpendicular to the axis of the can. The groove has a predetermined diameter larger than the diameter of the can, while 214~0~6 the spring in its relaxed state is greater than the diameter of the can and is at least equal to the predetermined diameter of the groove. The spring preferably is slightly greater in diameter than the groove so that it is constantly exerting an outwardly directed force and hence to retain itself within the groove when so oriented.
Still another object of the present irvention is to provide variations to the above stated objects, for example, to provide a discontinuous or interrupted groove having segments peripherally spaced in a common plane about the interior of the can and a spring including peripherally spaced portions complimentary to the spaced groove segments and adapted to maintain its location substantially perpendicular to the axis of the can. The spring defining substantially smooth bridge means extending inwardly into the can and adapted to accept the generally axially extending secondary spring means used for retention of baffles and trim-rings.
A further object of the present invention is to provide a smooth lighting housing can except for a plurality of circumferentially spaced planar oriented apertures and an annular spring member having a plurality of laterally extending portions for complimentary engagement with a plurality of said apertures.
Such an arrangement can also include a substantially planar disc-like member moveably captured relative to the spring member. The spring member is discontinuous and provided with gripping means at its free ends, whereby squeezing said gripping means together 21460~

reduces the overall diametral size of the spring and thereby permits movement relative to said housing can.

BRIEF DESCRIPTION OF DRAWINGS
FIG.l is an elevational view in partial section of one embodiment of the present invention;
FIG. lA is an enlarged partial sectional view of an alternate configuration of a double bead groove for use on any substantially flat side of the interior of the can.
FIG. 2 is a plan view of one form of the main support spring element of the present invention;
FIG. 3 is a sectional view taken generally along line 3-3 of FIG. 1 showing the spring member of FIG. 2 positioned within a can groove;
FIG. 4 is a perspective view in partial section of the first embodiment of the present invention shown in FIGS. 1-3 with the light socket supported by the housing endcap;
FIG. 4A is a perspective view in partial section of the first embodiment of the present invention shown in FIG.4 but with the light socket axially displaced downwardly and supported by spring means rather than the endcap of the housing;
FIG. 5 is a sectional view of the embodiment shown in FIG. 1 modified with a reflector element supporting a trim element, both elements being supported by at least one tension spring, shown in installed position;

- 214~0S6 -FIG. 6 is a perspective view in partial section of the embodiment shown in FIG. 5;
FIG. 7 is a plan view of another embodiment, namely, the spring element used in FIG. 6, having the same spring supporting bridge elements of the prior embodiment but additionally having outwardly projecting loops or protuberances for complimentary engagement with a plurality of circumferentially spaced apertures or slots in planar array which can be disposed in the wall of the housing or in the root of the groove;
FIG. 8 is a further variation in the spring element which includes the bridge means for accepting secondary spring mounting means, externally projecting loops or protuberances for engagement with complimentary apertures in the can and additionally includes inwardly directed loops for capture in a planar flange means which in this embodiment is integral with an apertured cup-like member;
FIG. 8A is a sectional elevation taken along line 8A-8A in FIG. 8;
FIG. 8B is an exploded partial view of a spring loop traversing an aperture in the bottom of a groove with the spring seated in said groove;
FIG. 9 is a perspective view in partial section of an embodiment utilizing the teachings of FIG. 8 in the upper groove of the illustrated can;
FIG. 10 is a plan view in partial section of still another embodiment of spring member moveably captured by struck out tabs 214~01i6 in a planar flange member encircling and integral with an apertured generally flat cup shaped member;
FIG. lOA is a transverse section taken along line lOA-lOA
showing the loops of the spring traversing the apertures in the can wall and retained by struck out tabs to the planar flange member;
FIG. 11 is fragmented view taken along line 11-11 showing the loop of the spring projecting outwardly of a slot in the can wall;
FIG. 12 is a perspective view in partial section of an assembly utilizing the spring arrangement shown in FIG. 11 adjacent the upper end of the can in this figure;
FIG. 13 is a plan view taken along line 13-13 in FIG. 15 showing still another embodiment of a spring member having inwardly directed loop members captured in a planar flange element connected to a flat cup-like member and swaged flat portions extending through slots in the bottom of the groove;
FIG. 13A is an elevational view in partial section taken along line 13A-13A of FIG.13;
FIG. 13B is a partial section taken along line 13B-13B in FIG. 13;
FIG. 13C is a partial section taken axially along line 13C-13C in FIG. 13A showing the swaged flat on the wire spring extending through the slots in the groove;

2146~6 FIG. 14 is a fragmental view taken along line 14-14 of FIG.
13 showing the swaged flat on the spring extending outwardly through a slot in the groove; and FIG. 15 is a perspective view, in partial section, showing the modified embodiment of swaged spring member disposed in the upper slotted groove, as shown in the drawing.

DETATTT~'n DESCRIPTION OF THE lNV~NLlON
Referring now to the drawing wherein similar parts are designated by similar numerals, and particularly FIGS. 1 through 3, a lighting fixture 10 of the type contemplated by the present invention may include a can-like body or housing 12, closed at one end by an end cap or top 14 and open at the opposite end 15.
A socket 16, for accepting a light source 17, not shown for clarity in FIG. 1 but shown in FIG. 4, is provided in the interior of the housing 12 and may be adjustable or fixed, as is well known in the art, in differing axial positions. Suitable insulated power connection means 18 extends between the socket i6 and a junction box 20 for connection to the power source, not shown, as is also well known in the art. Screws 24 and at least one hangar bar 26, as are known in the art, serve to mount the housing 12 relative to the opening in the wall or ceiling 30. In the case of track lighting, the support means extending from the track generally is fixed to the end cap 14 or the housing 12 and normally will also accommodate the power connection, however, the 21460~

following housing and trim-ring description is applicable to both types of lightlng fixtures.
The illustrated sheet-metal housing 12 is generally a roll-formed can-like configuration, however, the housing can be roll-formed, die cast, injection molded or deep drawn to meet the requlrements of a particular installation. In accordance with the system of this invention, the housing when roll-formed can include at least one concave semi-toroidal annular groove 40 arranged in a planar array perpendicular to the axis of the housing. Such grooves 40 have a predetermined diametral spacing as measured from the root of a groove on one side of the axis of the housing 12 to the root of the groove diametrically opposed on the other side of the axis of the housing. Preferably there will be a plurality of annular grooves 40 axially spaced along the axis of the housing 12. Such grooves 40 are smooth to the feel and do not injure the hands of the installers.
The complimentary part of this system is a discontinuous or interrupted ring-like supporting spring member 50 having a diameter at least as large and preferably slightly larger than the predetermined diametral spacing of the grooves 40. The supporting spring members 50 each include a pair of radially inwardly projecting bridge-like rod means 52, for purposes set forth hereinafter, and a pair of inwardly directed handle means 54. When an opposing pressure "A", as indicated by the arrows "A", is applied to the handle means 54 the spring will deflect and cause the portion 58 to bend slightly causing segments 56 and 21~0~6 60 to approach one another and reducing the diametral measurement thereof, thereby permitting insertion of the spring 50 into the interior of the housing 12 and insertion of the spring 50 into engagement with one of the grooves 40. As can be seen the spring 50 is really an interrupted member, as for example the spacing created by the material comprising the configuration of inwardly projecting bar 52 and supporting spring legs 51 as well as the gap between and disconnected spacing of the handles 54. Hence it is the circumferentially spaced portions 56, 58, and 60 that are seated in and contact the groove 40 in peripherally spaced locations. Thus, this invention is also meant to contemplate a housing device, not shown, which would have a discontinuous groove that was complimentary to and capable of accommodating the spaced portions of the spring, as long as the spring was generally maintained in a planar position perpendicular to the axis of the housing 12.
It will be seen that the spring 50 can be positioned in any one of a plurality of axially spaced grooves 40. As seen in FIG.
4 the spring 50 is positioned in the lowermost groove 40 to accommodate a connecting torsion spring 78 supporting a trim ring 70 having lateral spring-like flange 71, an internal fold-over flange 72 and at least two upward extending tabs 73 adapted to be accepted within the torsion rings 80 of spring 78 terminating in a pair of spread arms 82 with a flange or hook 84 at their extremities. The torsion spring 78 arms 82 are squeezed together so that the hooks 84 can be introduced into the bridges 52 with 2l46n~6 the angular spring arms 82 pressing against the inner extensions 51. The spring 78 insures tight positioning of the ring 70 against the wall or ceiling 30 as well as to insure prevention of ambient vibrations from causing a rattling condition. If desired, the inwardly directed flange 72 can serve to support a flanged lens 88 closing the end 15 of the housing 12.
As seen in FIGS. 2 and 4 the spring 50 includes the reversely bent extensions 51 that support bars 52. When spring 50 is inserted into a groove 40 it forms a generally elongated cage defined by extensions 51, bar 52 and the housing 12. This is ideally suited to accept the hooked-end arms 82 of the connecting torsion spring 78. In this embodiment, the spring 78 is mounted on the free end of a flat tab 73 having a laterally extending trim-ring 70.
In some instances it may be desirable to keep the housing 12 substantially constant in external diameter for aesthetics or for dimensional reasons necessary for installation. In such circumstances it may be undesirable to have the semi-toroidal body forming groove 40 projecting outwardly from the surface of the housing. In such cases it is possible to provide an annular double bead in the form of a pair of inwardly directed walls 100, as best seen in exploded view in FIG. lA, forming a pair of axially spaced concavely outwardly extending grooves 102 that open outwardly and between grooves 102 support an inwardly opening groove 40a whose outwardly directed convex shell does not 2146Q~6 extend outwardly beyond the theoretical envelope of the housing 12.
A modification to the first embodiment can be seen in FIG .
4A, basically the same envelope shown in FIG. 4, except wherein the socket 16a is not supported by the endcap 14, but rather, is supported by a secondary shroud 110 that is connected and supported by the torsion springs' arms 82 engagement with the bridges 52. A secondary portion 112 of the shroud encases the lamp 17a in protective array. (The socket 16a connection with the power means 18 is not shown for clarity in illustration of the present invention).
Referring now to the next embodiment best seen in FIGS . 5 - 9, wherein similar parts are referred to by similar numerals and variations identified with the suffix "b".
In this embodiment the spring 50b includes a plurality of outwardly extending circumferentially spaced protruberances or loops 114 which are substantially equal in number to complimentary slots 115 which are located in the wall of housing 12. The slots can either be independently arranged in circumferentially spaced planar array or alternatively can be located in the root of one of the grooves 4 0 . As can be appreciated, the spring 50 and grooves 40 provide an axial restraining system, while the slots 115 and loops 114 provide both an axial as well as a rotational restraining system. Such a spring 50b can be utilized in a multiplicity of locations within the housing and is limited only by the number and spacing of 21460~6 grooves within the housing 12 or, alternatively, the number and spacing of slots 115. In one form of the modified spring 50b, seen in FIGS. 5 and 7, the spring 50b includes a plurality of laterally extending loops or protuberances 114 that are accepted in complimentary slots 115 located in the roots of grooves 40. A
tension spring member 118 having connective means 117 and 119 at opposite ends thereof is connected by means 119 at one end to the bridge 52b and at the opposite end connected by means 117 to aperture 121 at the minor end of baffle 120. The open end of baffle 120 has a laterally extending flange 122 adapted to mate with and support trim ring 124 serving to provide an aesthetic closure for open end 15 of housing 12.
A variation on this embodiment can be found in FIGS. 5, 8 and 9, wherein the spring 50b is captured by and supports a polygonal shaped planar member 128 integral with a shallow cup-like element 126. The planar member 128 is lanced at a plurality of circumferentially spaced portions as at 132 to form a strap 134 spaced from 128 to accept one of a plurality of radially inwardly directed elements 136 of spring 50b. The lanced portions 132 have an extent adequate to permit some lateral movement by elements 136 when handles 54b are squeezed together for adjustment or replacement of the spring 50b relative to the housing 12. The planar flange 128 includes a segment 140 which is relieved and substantially spaced from the bridge 52b to permit access to the bridge for attachment of supporting means such as tension springs 118 or torsion springs 78. The cup-like member 2l~6n66 126 is centrally apertured as at 130 and provided with key-hole slots 131 for accepting dogs on sockets (not shown) by rotational assembly.
FIG. 6 discloses in perspective relation a long neck flood or spot lamp having the socket means supported by the endcap 14 and the baffle 120 supported by at least two springs 118 connected to the upper groove and slot means for accepting the spring 50b. FIG. 9, on the other hand, discloses a more normal short neck bulb 17 accepted in a socket held in the flat cup-like member 126 which is part of the assembly shown in FIG. 8.
Another embodiment, shown in FIGS. 10-12, wherein similar parts bear similar numerals with the addition of the suffix ~'c", includes a spring 50c having a plurality of laterally outwardly extending elements 114c. The spring 50c is associated with a shallow cup-like member 126c having a laterally extending flange 128c with a plurality of circumferentially spaced lanced tabs 150 adapted to accept the spring 50c and retain same in moveable relation. This permits the handles 54c to be squeezed together to move the loops 114c inwardly to permit insertion or readjustment of the spring 50c relative to the housing 12c. This embodiment does not utilize any grooves but rather relies on the slots 115c arranged in planar array to locate and retain the springs 50c.
The embodiment shown in FIGS. 13-15 is related to the last described embodiment with similar parts designated by similar numerals with the addition of the suffix "d". In this embodiment the inventor utilizes a plurality of swaged flats 160 on the spring wire 50d instead of the loops 114 to engage in complimentary slots 162 located in the root of grooves 140d.
One advantage of the cans of the present invention is that the can does not have the vents required by the cans presently used. Such vents are normally the result of striking out support means from the wall of the can. The holes in the cans as illustrated in FIGS. 6-12 are relatively small and their area is preferrably less than 5~ of the total outside area of the can.
Other embodiments will be apparent to those skilled in the art, however, it my desire to not be limited in scope except as done by the attached claims.

Claims

1. A trim-ring auxiliary member system for capturing and supporting an auxiliary member relative to the interior and open end of a lighting housing, comprising said auxiliary member, a supporting spring member sized to be removably secured to said interior of said lighting housing, and a connecting spring for removably attaching said auxiliary member to said supporting spring member.

2. A trim-ring system as claimed in claim 1 wherein said system includes a resilient primary support spring member adapted to cooperate with selected axially spaced means within said housing for capturing and supporting said trim-ring system.

3. A trim-ring system as claimed in claim 2 wherein said housing includes at least one inwardly opening concave annular groove axially spaced from said open end of said housing, said support spring member including inwardly extending bridge-like bar means for cooperating with one end of secondary resilient means which is connected at its opposite end to said auxiliary member, said support spring member disposed within and retained by said at least one annular groove.

4. A trim-ring system as claimed in claim 3 wherein said annular groove is disposed in planar array perpendicularly relative to the axis of said housing, whereby when said support spring member is located in said groove the said bar means are disposed substantially equidistant from said free end of said housing and will provide support means capable of uniformly applying spring loading to said secondary resilient means to provide uniform pressure on said trim-ring.

5. A trim-ring system as claimed in claim 4 wherein said secondary resilient means is at least one tension spring having hook-means at opposite ends thereof to fasten said at least one tension spring to said trim-ring and one of said bar means.

6. A trim-ring system as claimed in claim 4 wherein said secondary resilient means is a torsion spring carried by said trim-ring means, the hooked ends of said torsion spring arms being captured within the void formed by said bar, supporting legs and the inside wall of said housing.

7. A can-type housing system for lighting fixtures including an internal support means for retention of at least one auxiliary means, said support means being axially adjustable to a plurality of positions in a simple manner without the use of tools or external fastening means.

8. A housing system as claimed in claim 7 wherein said housing has a predetermined internal diametral measurement.

9. A housing system as claimed in claim 8 wherein said support means includes a flexible spring means generally complimentary to the interior configuration of said housing.

10. A housing system as claimed in claim 9 wherein said spring in its unflexed at-rest state has a diametral measurement at least equal to said predetermined internal diametral measurement of said housing.

11. A housing system as claimed in claim 10 wherein said housing includes at one annular groove means disposed in planar array and opening concavely into said housing interior, said groove adapted to accept a substantial portion of said spring.

12. A housing system as claimed in claim 9 wherein said groove has a predetermined diameter greater than the diameter of said housing, the diameter of said spring in its relaxed state is greater than the diameter of said can and at least equal to said predetermined diameter of said groove.

13. A housing system as claimed in claim 11 wherein said spring has a generally annular interrupted configuration, a pair of opposed bridge shaped means formed from continuous displaced material including elongated bar means extending in generally parallel radially spaced inwardly in offset relation to the imaginary envelope of said annular spring, the free ends of said spring being spaced from one another and a substantial portion of the spring adjacent each end being turned inwardly to form a pair of spaced handles groupable by an operator to foreshorten or reduce the radial dimension of the spring member for insertion into said housing and the concavity of at least one of said grooves, release of compressive pressure on said handles resulting in the outward snapping of said spring member into retention in at least one of said grooves.

14. A housing system as claimed in claim 13 wherein said spring member is formed from spring wire material.

15. A housing system as claimed in claim 13 wherein said spring member is formed from strip spring material.

16. A housing system as claimed in claim 8 wherein said housing includes an initially flat sheet body having roll-formed groove means opening concavely inwardly when said sheet body is rolled into a substantially cylindrical configuration, the inside of said body having a substantially smooth interior wall.

17. A housing system as claimed in claim 11 wherein said housing is formed of sheet metal and retained in assembled fashion as by welding.

18. A housing system as claimed in claim 16 wherein said housing is formed of sheet plastic material and retained in assembled relation as by heat welding or adhesive.

19. A can-type housing for electric lighting fixtures including a sheet material tubular housing having at least one annular groove means facing concavely inwardly in planar array perpendicular to the axis of said housing, a support means including an annular flexible interrupted spring means having handle means for flexing said spring means into a smaller diametral configuration to permit said support means to be inserted within said housing and snapped into engagement within said annular groove means, said support means further including a pair of opposed bridge means adapted to accept secondary spring means for connecting and supporting auxiliary aesthetic means in semi-fixed relation within said housing.

20. A resilient interrupted annular ring means generally circular in configuration, a pair of spaced inwardly directed handle means fixed to opposing spaced ends of said ring means, a pair of opposed bar means each located on opposite sides of the axis of said ring means, reversely bent leg means connected at one end to adjacent spaced segments of said ring means and at their other end to opposite ends of one of said bar means, whereby said bar means are supported in spaced relation within the envelope of said ring means in generally parallel relation to the theoretical path of said ring means.