US2935601A

US2935601A - Luminaire and mounting means therefor

Info

Publication number: US2935601A
Application number: US604748A
Authority: US
Inventors: Joseph W Steiner; Edward L Beach
Original assignee: Westinghouse Electric Corp
Current assignee: CBS Corp
Priority date: 1956-08-17
Filing date: 1956-08-17
Publication date: 1960-05-03
Anticipated expiration: 1977-05-03

Description

y 3, 1960 J. w. STEINER ETAL 2,935,601

LUMINAIRE AND MOUNTING MEANS THEREFOR Filfld Aug. 17, 1956 4 Sheets-Sheet 1 Fig.l.

WITNESSES INVENTORS Joseph W, Steiner 6 44; Edward L. Beach M ATTORNEY 1960 J. w. STEINER ETAL 2,935,601

LUMINAIRE AND MOUNTING MEANS THEREFOR 4 Sheets-Sheet 2 Filed Aug. 17, 1956 Fig.2.

y 1960 J. w. STEINER ETAL 2,935,601

LUMINAIRE AND MOUNTING MEANS THEREFOR F11 Aug. 17, 1956 4 Sheets-Sheet 3 72 2 3 Fig.

J l2 ----L 0 v J. w. STEINER ETAL 2,935,601

LUMINAIRE AND MOUNTING MEANS THEREFOR Filed Aug. 17, 1956 4 Sheets-Sheet 4 Fig.5

54 rv' 30 l @50 B8 s 6o 58 j LUMINAIRE AND MOUNTING MEANS THEREFOR Joseph W. Steiner, North Olmsted, and Edward L. Beach,

Fairview Park, Ohio, assignors to Westinghouse Electric Corporation, East Pittsburgh, Pa., a corporation of Pennsylvania Application August 17, 1956, Serial No. 604,748

13 Claims. (Cl. 240-46) Our invention relates to a new and improved luminair-e and more particularly to a new and improved luminaire which is operable when immersed in a liquid.

In installing luminaires for underwater use, it is common practice to provide the liquid retaining walls, such as the sides of a swimming pool, with niches, each of which is of a size to receive a luminaire with the face of the luminaire being susbstantially flush with the side of the pool wall. It is also common practice to provide the periphery of each niche with a mounting frame which engages the luminaire to prevent the luminaire from floating out of the niche. Heretofore, it has been difficult to obtain a satisfactory means for retaining the luminaire in the mounting frame so that the luminaire normally remains within the niche, and so that it may readily be removed for maintenance purposes. Many prior luminaires have employed securing means which extend outwardly from the front of the luminaire which has constituted a definite hazard to humans, such as swimmers, engaging the securing means with parts of their body.

As can also be appreciated, it is necessary in underwater luminaires to provide a water-tight seal between the various parts of the luminaire which form the outer shell of the luminaire. Heretofore, various types of gaskets had been employed between the individual parts which has added considerably to the expense of the device. In some instances, prior lurninaires have utilized a one piece gasket of rather intricate construction to provide satisfactory sealing means.

Accordingly, one object of our invention is to provide a new and improved luminaire having new and improved means cooperable with a mounting frame for retaining the luminaire within a niche.

Another object of our invention is to provide a new and improved luminaire having a single one piece gasket of simplified form for providing a liquid-tight seal between all parts of the luminaire forming the outer shell of the luminaire.

Still another object of our invention is to provide a new and improved luminaire having a spring latch which may easily be operated from the face of the luminaire to permit insertion and removal of the luminaire from in front of a mounting frame mounted in the wall of a liquid retaining means.

A more specific object of our invention is to provide a new and improved luminaire having a resilient, formed cantilever beam type leaf spring mounted on the luminaire which is movable toward the luminaire and into and out of engagement with a mounting frame.

Still another more specific object of our invention is to provide a new and improved luminaire having a one piece resilient U-shaped gasket with circumferential corrugations on the inner surface of at least one of the arms and on the outer surface of at least one of the outer arms to provide a water-tight seal between the housing, lens and lens supporting member of the luminaire.

These and other objects of our invention will become States Patent ice more apparent upon consideration of the following detailed description of a preferred embodiment of a luminaire and mounting frame therefor constructed in accordance with the principles of our invention, when taken in conjunction with the attached drawings in which:

Figure 1 is a front elevational view of a luminaire and mounting frame therefor constructed in accordance with the principles of our invention;

Fig. 2 is a side elevational view of the luminaire and mounting frame as shown in Fig. 1;

Fig. 3 is a cross-sectional view of the luminaire and mounting frame shown in Fig. 1, taken substantially along the'line lII-III thereof;

Fig. 4 is an enlarged perspective view of the latch portion of the luminaire at the back of the luminaire,

and the cooperating latching engaging portion of the 1 mounting frame as shown in Fig. 3. Fig. 5 is a cross-sectional view of a luminaire an mounting frame as shown in Fig. 2 taken along the line V-V thereof with certain parts thereof being broken away.

Referring to Fig. 3, it will be noted that a luminaire constructed in accordance with the principles of our invention comprises an elongated cup-shaped housing 2 having a base 6 to which an inverted generally U-shaped bracket 4 is secured to the inner surface thereof, in any suitable manner, such as by welding. As shown, the bight portion of the bracket 4 is generally parallel to the base 6 of the housing 2 and has a suitable lamp holder 8 rigidly secured thereto in any suitable manner (not shown), so that a lamp 1% may be supported thereby to extend longitudinally toward the open end of the housing 2. It is to be realized that the particular lamp holder mounted in the luminaire will depend upon the type of lamp which is to be used and that various combinations of lamp holders and lamps may be utilized as are well known in the art, If desired, other suitable supports for the lampholder may be employed or the lampholder may be suitably secured directly to the base 6 of the housing 2. Electrical connections are made to the lamp holder 8 by means of a multiple wire supply conductor 12 which is electrically connected to spaced terminals 14 on the lamp holder 8.

As shown, a cup-shaped refiecor 16 is located within the housing 2 and is provided with an opening at its inner end to permit the socket end of the lamp 10 to extend .therethrough. The inner end of the reflector- 16 is rigidly secured to the sides of the bracket 4 by means of longitudinally extending side braces 18 which are suitably secured to both the reflector '16 and the bracket 4, in any suitable manner, such as by means of screws 15 and 17, respectively. In order to properly locate the outer end of the reflector 16 within the housing 2, the reflector 16 is provided with an outwardly extending circular lip 20 as its outer end which engages an outwardly flared circular bead 22 on the side wall of the housing 2 adjacent its open end. it will be realized that the housing 2, support 4 and braces 18 may be formed from a wide variety of structural materials having sulficient structural strength. For our purposes, however, a corrosion resistant materiaL'such as an alloy of copper is preferred which, in addition to being corrosion resistant, is easily formed. The lamp holder 8 and the conductor 12 may be of any suitable standard construction. As shown in Fig. 2 a liquid tight packing gland 19 of well known construction is mounted in the side of the housing 2 to permit the conductor 12 to extend therethrough.

The open end of the housing 2 is secured to an annular lens holder 24 having a slightly outwardly dished light transmitting lens 26 mounted centrally therein. Referring also to Fig. 4, it will be noted that the lens holder 24 is generally T-shaped in section with the integral stern portion forming a flange 28 extending toward the housing 2. With such construction, the inwardly facing side of the flange 28 and the inner surface of the lower cross bar portion of the lens holder 24 form a generally L- s'haped seat 32 in which a generally U-shaped gasket 36 is located. The gasket 30 may be formed from any suitable waterproof flexible and resilient material and for our purposes is preferably formed from a molded resilient material such as rubber. The outer arm of the gasket 30 may be provided with a relief to insure proper seating in the seat 32.

The lens 26 is circular in form and is provided with an outwardly extending flange 34 around its outerfperiph'ery which is located between the arms of the gasket 30. In order to obtain a liquid tight seal, the inner surfaces of the arms of the gasket 30 are provided with narrow annular ribs 36 which, when compressed against the opposite sides of the flange 34, provide a tight seal in conjunction therewith under relatively light pressures because the narrow ribs 36 are readily deformed into intimate engagement with the surfaces of flange 34. Simil arly, narrow annular ribs 37 may be provided on the outer surface of the arm of the gasket 30 engaging the housing 2 to provide a liquid-tight seal therebetween. In assembling the lens structure the flange 34 is first inserted between the arms of the gasket 36, and thereafter the lens 26 and the gasket assembly 30 is inserted into the L-shaped seat 32 of the lens holder 24. In order to positively locate the gasket 30 with respect to the lens holder 24, arcuately spaced radially extending projections 33 are provided at the sides of the gasket 30 which are insertable within arcuately spaced radially 1 extending openings 40 in the flange 28 of the lens holder 24 which are slightly larger in diameter than projections 38. the lens 26 its bight portion is stretched so that its outside diameter is substantially the same size as the inside diameter of the flange. Such a construction requires the bight portion of gasket 30 to be slightly compressed in order that the gasket 30 may be located in seat 32. In addition, the projections 38 must be worked into the openings 40; however, this and the compressing of gasket 30 may be accomplished by utilizing a standard tool such 'as a screw driver to compress the gasket 30 and to provide clearance so that the projections 38 can enter the openings 40. When so inserted the gasket 30 secures the 'lens holder 24 and the lens 26 together.

It will be noted that housing 2 has a radially out- 'w'ardly extending flange 42 at its open end which engages lthe arm of gasket 30 facing the open end of the housing 2. Also, the lens holder 24 is provided with a plurality of integral arcuately spaced bosses 44 (see Fig. 4) which extend radially outwardly from the outer'surfaces of the flange 28 and which have their outer ends located substantially flush with the outer edge of the cross bar portion of the lens holder 24. With such a construction the housing 2 may readily be secured to the lens holder 24 by providing spaced openings in the flange 42 thereof which correspond to the spacing of the bosses 44 on the lens holder 24, and inserting suitable securing means therethrough suchas machine screws 3, which engage threaded openings 43 in the bosses 44. It will be noted that the outer surface of the flange 42 also extends over the outer surface of the gasket 30 facing the housing 2 so that upon tightening of the screws-3 the ribs 37 on the gasket 30 are compressed between the seat 32 and the flange 42 of the housing 2. With such construction, it will be noted that only a single gasket is required to obtain a seal between the two enclosing elements of the luminaire, that is, the lens 26 and the housing 2. The same gasket also provides cushioning between lens holder 24 and lens 26.

As heretofore indicated, in submerged installationsit is'customaryto provide'the side of the retaining wall In placing the gasket 36 over the flange 34 of with niches, not shown, in which the luminaire is inserted. As is also customary, each niche is provided with a mounting frame which is permanently or semi-permanently secured to the side wall so as to lie in a plane at the open end of the niche during the period the side wall is formed. As shown in Figs. 1 and 5, a rectangular mounting frame 46 is provided having a circular opening 48 therein with a plurality of spaced projections 50 extending outwardly from the back surface thereof so that the mounting frame 46 may be secured to the side wall. As is general practice in the construction of swimming pools, concrete sides are used and machine screws 5 (Fig. 2) are threadedly received within each projection 50 so that the concrete will readily set around the projections 5%) and screws 5 to obtain a good bond between the mounting frame 46 and the side of the pool. If desired other suitable means for securing the frame 46 to the side of the pool wall may be employed.

As shown, the mounting frame 46 is provided with a generally rectangular opening or notch 52 which extends outwardly from the upper edge of the opening 48 and which is preferably located to one side of the vertical center line of the mounting frame 46. The mounting frame 46 is also provided with integral L-shaped restraining lugs 54 at each of its sides and at the top thereof, each of which has its long leg extending out wardly from the back surface so as to be substantially flush with the edge of the opening 48, and its short leg extending radially inwardly thereof.

An integral boss 56 is provided on the mounting frame 46 at the bottom of the opening 48 which extends outwardly from the back surface and which is provided with a pocket 56 on each side of the vertical center line of the mounting frame 46. An upwardly extending restraining lug 60 is secured to the central portion of the boss 56 in any suitable manner such as by means of a screw 61 extending therethrough and threadedly engaging in the boss 56. The lug 60 extends radially toward the-center of the opening 48 and is provided with an offset portion at its inner end which extends outwardly from the back surface. As can also be appreciated, the mounting frame 46 and the lens holder 24 are preferably formed from a corrosion resisting material which may readily be formed to the desired shape and with the desired structure. For such purposes, a casting bronze or brass has been found to be satisfactory.

With the mounting frame 46 rigidly secured in position and with the luminaire assembled as previously indicated, the luminaire is initially inserted through the opening 48 in the mounting frame 46 with the upper edge of the lens holder 24 being slightly tilted outwardly from the mounting frame 46. It will be noted that the lower edge of the lens holder 24 is provided with a pair of integral projections 62 which extend radially outwardly from the inner surface of the flange 28 beyond the outer edge of the cross bar of the lens holder 24. By tilting the luminaire forward, projection 62 may easily be inserted within the pockets 58 of the mounting frame 46; thereafter, the entire luminaire may be tilted about the bottom of the lens holder 24.

In order to permit the assembled luminaire to be easily installed and removed from the mounting frame 46, the outer surface of the upper portion of the flange 28 is provided with a short upwardly extending boss 64 to which one end of an elongated formed leaf spring 66 is secured in any suitable manner, such as by means of screws 65 extending therethrough and threadedly engaging openings in the boss 64. Spring 66 may be formed from any suitable resilient corrosion resistant material, such as an alloy of copper. The spring 66 initially is inclined upwardly from the boss 64 to a point beyond the outer edge of the lens holder 24 and thereafter is provided with a straight portion 70 which extends generally tangentially to the outer edge of the cross bar portion of the lens holder 24 and which is spaced slightly 0utwardly therefrom. In order to provide a latching member the extreme outer end 76 of the spring 66 is oifset outwardly of the straight portion 70.

It will also be noted that the lens holder 24 is provided with an integral projection 72 which extends outwardly from the outer cross bar portion thereof at the top. The projection 72 is located on the lens holder 24 so that it enters the notch 52 on the mounting frame during the mounting process with the sides of the projection 72 lying closely adjacent the ends of the notch 52. The projection 72 also is located so as to extend in front of the straight portion 70 of the spring 66. In order to permit engagement of the straight portion 70 of the spring 66 from the front of the frame 46, the projection 72 is provided with a central notch 74 which extends inwardly toward the cross bar portion of the lens holder 24.

With such construction it will be obvious that the outer end 76 of the spring 66 will strike the outer face of the mounting frame 46 adjacent the notch 52. In order to permit insertion of the assembled luminaire the outer end 76 of the spring 66 must be depressed toward the flange 23, for example, by inserting any suitable blunt tool, such as a screwdriver, through the notch 74 to engage the outer surface of the straight portion 70 0f the spring 66, and force the straight portion 70 toward the flange 28. Once such depression of the spring 66 has occurred the spring 66 may be slipped below the edge of the opening 48 in the mounting frame 46 so that the luminaire will be properly located within the niche. Once spring 66 has passed inwardly below the edge of the opening 48 and upon its release, the outer end 76 of the spring 66 will spring outwardly from the flange 28 so that movement of the luminaire outwardly of the niche will be restrained by the engagement of the outer end '76 with the inner surface of the mounting frame 46 adjacent the notch 52. Removal of the luminaire from the niche can easily be accomplished in the reverse manner.

In order to prevent excessive bending of the spring 66 toward the flange 28, a boss 44 is located in the path of inward movement of the spring 66 so that the undersurface of the outer end 76 thereof engages the top thereof. Similarly, an integral projection 78 extends outwardly from the flange 28 and the outer portion of the cross portion of the lens holder '24 approximately centrally of the notch 74 which engages the undersurface of the straight portion 79 of the spring 66 to prevent excess bending thereof. Outward movement of the spring 66 is limited by means of an integral stop 80 which extends outwardly from the inner surface of the mounting frame :6, and is located to engage the upper surface of the outer end 76 of the spring 66. It will thus be noted that due to the clearance between the straight portion '76 and the projection 78, and the clearance between the outer end 76 and the adjacent boss 44 that the assembled luminaire may float upwardly toward the stop 3% without causing any damage to the spring 66. Further, due to the resiliency of spring 66 the assembled luminaire may float away from the stop 80 without causing the outer end 76 to disengage the stop 86. Such upward floating is preferably limited, however, by the engagement of the cross bar portion of the lens holder 24 with the upper edge of the opening 48. Further, it will be noted that the inward movement of the assembled luminaire during installation or by floating action is limited by the engagernent of the flange 42 of the housing 2 with the radially inwardly extending aims ofthe lugs 54 whereby the assembled luminaire is properly maintained in the niche at all times. The lower portion of the luminaire is similarly restrained from movement inwardly of the niche by the lug 60.

Thus it will be noted that we have provided a simplified luminaire assembly for submerged installations which also supports a latching mechanism for obtaining easy insertion and removal of the luminaire'frorn .a niche.

Although not shown, it is to be realized that the outer edges of the niche must be provided with sufficient clearance space for the various projections at the rear of the frame 46.

Having described a preferred embodiment of our invention, as required by the patent statutes, it is desired that the invention be not limited to the particular construction specifically illustrated and described herein, as it will 'be readily apparent to persons skilled in the art that various changes and modifications may be made in the particular structure shown without departing from the broad spirit and scope of our invention.

We claim as our invention:

1. In combination in lighting apparatus for mounting a luminaire, a mounting frame having an opening therein, a luminaire of a size to be inserted through said opening, said luminaire having a lens secured over an outer opening in the luminaire by an annular lens holder having an outwardly extending flange also of a size to pass through said opening, resilient means mounted on said lens holder behind said flange and having a portion projecting beyond said flange so that said resilient means must be deflected toward the luminaire to permit movement of said luminaire through said opening in said mounting frame to bring said flange substantially flush with said frame so that said resilient means when released engages the rear of said mounting frame and securely holds the luminaire against withdrawal forces, said mounting frame being of a configuration so that said resilient means can be accessible from the front of said mounting plate for subsequent deflection of said resilient means toward said luminaire when said luminaire is to be withdrawn, and means for holding said luminaire generally flush with the mounting frame against forces othe than said withdrawal forces.

2. In combination in lighting apparatus, a mounting frame having an opening therein, a notch extending outwardly from said opening in said mounting frame, a luminaire of a size to be inserted through said opening, said luminaire having a lens secured over an outer opening in the luminaire by an annular lens holder having an outwardly extending flange also of a size to closely pass through said opening, resilient means mounted on said lens holder behind said flange and having a part projecting beyond the periphery of said flange so that said resilient means must be deflected towards the luminaire to permit movement of said luminaire through said opening in said mounting frame, spaced lugs located on the rear side of said mounting frame adjacent to said opening and extending inwardly towards the center of said opening, said lugs engaging a reaiwardly facing portion of said luminaire when said luminaire is positioned with the lens holder flange substantially flush with said mounting i said luminaire in the vicinity of said notch.

3. In combination in lighting apparatus, a mounting frame having an opening therein, a notch extending outwardly from said opening in said mounting frame, spaced lugs attached to the rear portion of said mounting frame and offset rearwardly of the plane of said opening and extending inwardly of said opening, a luminaire of a size to be inserted through said opening, said luminaire including a cup-shaped enclosure having projecting means at its outer end engageable with said lugs to limit movement of the luminaire into the opening, said luminaire having a lens over the open side of said enclosure, a U- shaped yieldable gasket mounted on the outer edge of saidlens, an annular lens holder receiving said gasket lens holder, said resilient means at its tip engageable to be depressed towards the lens holder to permit said resilient means to be moved below the edge of said open ing and occupy a similar position on the other side of said mounting frame upon movement of said luminaire through said opening, stop means on the rear side of said mounting frame to restrict the movement of said resilient means in an outward directiomsaid resilient means when released also engaging the rear side of the mounting frame to restrict the outward movement of the luminaire.

4. in combination in a liquid tight luminaire, a mourn ing frame having an opening therein, a luminaire of a size to be inserted through said opening and having a lens, an annular yieldable gasket which is U-shaped in section circumferentially mounted on the outer edge of said lens, said luminaire having a cup-shaped housing with a flange portion at its opening engaging the outer surface of one arm of said U-shaped gasket, a lens holder pressed on the gasket engaging the outer periphery of the gasket and the outer surface of the opposite arm of the gasket, spaced securing means on the lens holder and the housing flange to draw said lens holder and housing together to compress said gasket therebetween, said gasket having yieldable annular ribs on the inner surfaces thereof contacting the edge of the lens and on the outer surface of the arm contacting-the flange of the cup-shaped housing, said ribs being deformed into engagement when said gasket is compressed to provide a liquid tight seal, resilient means mounted on said lens holder to engage the rear portion of said mounting frame when the luminaire is inserted into said opening to secure the liquid tight luminaire to the mounting frame.

5. In combination in lighting apparatusfor mounting a luminaire, a mounting frame having an opening therein, a notch extending outwardly from said opening, a luminaire of a size to be inserted through said opening, said luminaire having a lens secured over an outer opening in the luminaire by an annular lens holder having an outwardly extending flange mounted on and about its outer periphery and of a size to closely fit in said opening, said lens holder having an integral projection extending radially outward from one side thereof, said projection being angularly insertable through said opening from one side of said frame to permit rotation of said lens holder toward said mounting frame about an axis and passingthrough the point of engagement of said projeotion with said mounting frame, resilient means mounted on said lens holder behind said flange at a point spaced from said projection, said resilient means extending beyond the outer periphery of said lens holder flange, said resilient means engageable with the rear portion of said mounting frame at a point closely adjacent to said notch in said frame so that said resilient means can be accessible from the front of said mounting plate, said resilient means and said projection on the lens holder securely holding the luminaire against withdrawal forces, and

meansfor holding said luminaire generally flush with the mounting frame against forces other than said withdrawal forces.

6. In combination in lighting apparatus, a mounting frame having an opening therein, a notch in said mounting frame extending outwardly from said opening, a luminaire having a lens secured over an outer opening in the luminaire by an annular lens holder having an outwardly extending flange mounted on and about its outer periphery and of a size to fit in said opening, said lens holder having at least one projection extending radially outward thereof, said projection being angularly insertable through said opening from one side of said frame to permit rotation of said lens holder toward said mounting frame about an axis and passing through the point of engagement of said projection with the rear side of said mounting frame, a second projection located on said lens holder flange relatively diametrically opposite 'ofthe first-flange projection, sai'd'second projection of a size to pass through said notch, lugs attached to the rear portion of said mounting frame projecting inwardly of the mounting frame opening, said lugs engaging the luminaire to restrict its inward movement through said opening, resilient means mounted on the periphery of the lens holder, said resilient means engageable with the rear portion of said mounting frame at a point closely adjacent to said notch in said frame, said resilient means having a portion exposed by said notch in said opening of said mounting frame so that said portion can be depressed from the outer side of the frame to releasably engage or disengage said resilient means from said mounting frame, said lens and lens holder being generally flush with said mounting frame when secured in place.

7. In combination in lighting apparatus, a mounting frame having an opening therein, a notch in said mounting frame extending outwardly from said opening, a luminaire having a lens secured over an outer opening in the luminaire by an annular lens holder having an outwardly extending flange mounted on and about its outer periphery and of a size to fit in said opening, said lens holder having a projection extending radially outward thereof, said projection being angularly insertable through said opening from one side of said frame to permit rotation of said lens holder toward said mounting frame about an axis and passing through the point of engagement of said projection with the rear side of said mounting frame, a second projection located on said lens holder flange relatively diametrically opposite the first flange projection, said second projection having a central notch on its outer end of a generally rectangular shape, resilient means located on the periphery of said lens holder having its outer portion behind and in alignment with the central notch so as to be depressed by means inserted in said central notch, said resilient means engaging the rear portion of said mounting frame when it is in its extended position, said mounting frame having a stop to restrict the upward movement of said resilient means, said resilient means being releasably latched to the mounting frame and thereby securing the luminaire to the mounting frame in a generally flush position.

8. In combination in lighting apparatus, a mounting frame having an opening therein, a luminaire of a size to be inserted through said opening, said luminaire having a lens secured over an outer opening in the luminaire by an annular lens holder having an outwardly extending flange mounted on and about its outer periphery and of a size to fit in said opening, said lens holder being of a configuration to be closely received within said opening in said frame, said flange of said lens holder being substantially flush with the mounting frame when said luminaire is in place, a U-shaped yieldable gasket insertable over the outer periphery of said lens, said lens holder pressed over said gasket and compressing one arm and substantially all of the bight portion of said U-shaped gasket, said luminaire having a flange extending outwardly from its open side, said luminaire flange engaging the other arm of the U-shaped gasket, means spaced outwardly of said lens holder engageable with said luminaire and lens holder flange to draw said luminaire and said lens holder together and compress said gasket to provide a liquid tight seal.

9. In combination in lighting apparatus, a mounting frame having an opening therein, a luminaire of a size to be inserted through said opening, said luminaire including a cup-shaped enclosure having an outwardly extending flange at its open end, a lens over the open side of said enclosure having a yieldable gasket about its outer periphery, an annular lens holder receiving said gasket, said lens holder being substantially T-shaped in cross section and of a configuration to be closely received within said opening in said frame, the cross portion of said lens holder being located substantially flush with the outer side of said mounting frame when said luminaire is in place, the stem portion of said lens holder compressibly engaging the outer periphery of said yieldable gasket,

said lens holder having integral spaced bosses located about the outer periphery of the lens holder, said bosses providing means for removably securing said lens holder to said cup-shaped housing and compressing the yieldable gasket therebetween to form a liquid tight seal.

10. In combination in lighting apparatus, a mounting frame having an opening therein, a luminaire of a size to be inserted through said opening, a lens, a T-shaped lens holder having an opening therein of a diameter larger than the outside diameter of said lens, a circular yieldable gasket which is U-shaped in cross section receiving the outer edge of said lens, said gasket when mounted on said lens having an outside diameter slightly'greater than the diameter of said opening in said lens holder, said lens holder inserted over said yieldable gasket to compress said gasket, a leg of said gasket compressed to one arm of said T-shaped lens holder, the bight portion of said gasket compressed to the leg of said T-shaped lens holder,

said luminaire including a cup-shaped housing with a flange about the opening of said housing, said housing flange having an inner diameter approximately equal to the inner diameter of said gasket, means securing said housing flange and said lens holder together to thereby compress the gasket on the side adjacent the housing flange to provide a liquid tight seal.

11. Apparatus of the type described comprising, a mounting frame having an opening therein, a luminaire of a size to be received in said opening at an operative position where its outer end is substantially flush with the outer surface of said frame, said luminaire including a casing having an'open outer end, a lens closing the open end of the casing and sealed thereto, flange means projecting laterally outwardly from the outer end of said luminaire of a size and shape to closely fit in said frame opening, means at the inner side of said frame positioned to engage the inner side of said flange means to limit insertion of the luminaire in said frame opening, and resilient means mounted on said luminaire rearwardly of the outer surface of said flange means and normally projecting outwardly thereof so that when it is deflected inwardly it can pass through said frame opening and when released will engage the inner surface of said frame to prevent outward movement of said luminaire.

12. Apparatus of the type described comprising, a mounting frame having an opening therein, a luminaire of a size to be' received in said opening at an operative position where its outer end is substantially flush with the outer surface of said frame, said luminare including a casing having an open outer end, a lens closing the open end of the casing and sealed thereto, flange means projecting laterally outwardly from the outer end of said luminaire of a size and shape to closely fit in said frame opening, means at the inner side of said frame positioned to engage the inner side of said flange means to limit insertion of the luminaire in said frame opening, and resilient means mounted on said luminaire rearwardly of the outer surface of said flange means and normally projecting outwardly thereof so that when it is deflected inwardly it can pass through said frame opening and when released will engage the inner surface of said frame to prevent outward movement of said luminaire, and a so that access can be had to said resilient means from the outer side of the frame to deflect the resilient means inwardly for the purpose of withdrawing the luminaire.

13. Apparatus of the type described comprising, a mounting frame having an opening therein, a luminaire of a size to be received in said opening at an operative position where its outer end is substantially flush with the outer surface of said frame, said luminaire including a casing having an open outer end, a lens closing the open end of the casing and sealed thereto, flange means projecting laterally outwardly from the outer end of said luminaire of a size and shapeto closely fit in said frame opening, means at the inner side of said frame positioned to engage the inner side of said flange means to limit insertion of the luminaire in said frame opening, and resilient means mounted on one of said frame and said flange means and being normally in engagement with the other of said frame and said flange means to retain said luminaire within said frame, said resilient means being disposed so that when deflected from said engagement said luminaire can pass through said frame opening.

References Cited in the file of this patent UNITED STATES PATENTS