ADAPTER ASSEMBLY FOR LUMINAIRE

Abstract

An adapter assembly for securing a luminaire to a niche formed in a wall of a pool or spa. The assembly comprises a mounting bracket having a rear portion shaped and sized to fit within the niche and a front portion comprising a peripheral flange sized to engage the wall surrounding the niche. The mounting bracket enables the luminaire to be secured thereto and be visible from a front side thereof. The assembly includes at least one clamping device attached to the rear portion of the mounting bracket and configured to secure the mounting bracket to the niche. In a preferred embodiment, the clamping device comprises a clamping arm and drive member. The clamping arm is pivotally connected to the mounting bracket such that the mounting bracket is drawn into the niche and the peripheral flange of the mounting bracket is drawn towards the wall surrounding the niche.

Claims

1. An adapter assembly suitable for securing a luminaire to a niche formed in a wall of a pool or spa, the adapter assembly comprising: a mounting bracket having a rear portion shaped and sized to fit within the niche and a front portion comprising a peripheral flange sized to engage the wall surrounding the niche, the mounting bracket also being configured to enable the luminaire to be secured thereto and be visible from a front side thereof; and at least one clamping device attached to the rear portion of the mounting bracket and being configured to secure the mounting bracket to the niche.

2. The adapter assembly of claim 1 wherein the clamping device comprises a clamping arm and drive member, the drive member being accessible from the front side of the mounting bracket when the rear portion is positioned within the niche such that, in use, the drive member is operable to drive the clamping arm towards an internal wall of the niche to thereby secure the mounting bracket to the niche.

3. The adapter assembly of claim 2 wherein the clamping arm is pivotally connected to the mounting bracket such that, when operated by the drive member, a free end of the clamping arm moves forwardly towards the front portion of the mounting bracket as it moves outwardly, away from a central axis of the mounting bracket and towards the internal wall of the niche, whereby the combined movement causes the rear portion of the mounting bracket to be drawn further into the niche and the peripheral flange of the mounting bracket to be drawn towards the wall surrounding the niche.

4. The adapter assembly of claim 3 wherein the clamping device includes stop members to limit movement of the clamping arm within predetermined travel limits.

5. The adapter assembly of claim 3 wherein the clamping arm comprises a rigid substrate material and the free end of the clamping arm includes a flexible material overlying the rigid substrate material so as to provide a degree of compliance as the free end of the clamping arm engages the internal wall of the niche.

6. The adapter assembly of claim 5 wherein the flexible material is provided with a toothed or notched profile to increase grip with the internal wall of the niche.

7. The adapter assembly of claim 6 wherein the toothed or notched profile has an asymmetrical shape to provide a greater degree of friction with the internal wall of the niche in one direction than in the other direction, to thereby resist unintended removal of the adapter assembly from the niche.

8. The adapter assembly of claim 2 wherein the drive member comprises a threaded bolt that is arranged to engage a threaded bore or nut within the clamping arm.

9. The adapter assembly of claim 8 wherein the threaded bolt comprises a head which projects through an aperture in the mounting bracket so as to be accessible from the front side of the mounting bracket when positioned within the niche.

10. The adapter assembly of claim 1 wherein three clamping devices are provided, substantially equally spaced around the mounting bracket.

11. The adapter assembly of claim 7 wherein the drive member comprises a threaded bolt that is arranged to engage a threaded bore or nut within the clamping arm.

12. The adapter assembly of claim 11 wherein the threaded bolt comprises a head which projects through an aperture in the mounting bracket so as to be accessible from the front side of the mounting bracket when positioned within the niche.

13. The adapter assembly of claim 12 wherein three clamping devices are provided, substantially equally spaced around the mounting bracket.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In the accompanying drawings:

[0035] FIGS. 1 and 2 show a prior art product as described in U.S. Pat. No. 4,971,283;

[0036] FIG. 3 shows another prior art product as described in European Patent No. EP 1936257;

[0037] FIG. 4 shows a further prior art product as described in U.S. Pat. No. 8,403,513;

[0038] FIG. 5 is a front view of an adapter assembly for securing a luminaire within a niche formed in a wall of a swimming pool or spa, in accordance with a preferred embodiment of the invention;

[0039] FIG. 6 is a rear view of the adapter assembly;

[0040] FIG. 7 is a front isometric view of the adapter assembly;

[0041] FIG. 8 is a rear isometric view of the adapter assembly;

[0042] FIG. 9 is a partial cross-sectional side view of the adapter assembly showing a clamping arm in an inoperative position;

[0043] FIG. 10 is a partial cross-sectional side view of the adapter assembly showing the clamping arm in an operative position;

[0044] FIG. 11 is a partial cross-sectional side view of the adapter assembly illustrating movement of the clamping arm between the inoperative and operative positions;

[0045] FIG. 12 is a partial cross-sectional side view of the adapter assembly showing the clamping arms in an interference fit with an internal wall of the niche;

[0046] FIGS. 13A-C are rear perspective, rear and alternative rear perspective views of an alternative adapter assembly for securing a luminaire within a niche formed in a wall of a swimming pool or spa, in accordance with a different embodiment of the invention.

[0047] FIGS. 14A-D are rear perspective, front, side and rear views of another alternative adapter assembly in accordance with a different embodiment of the invention;

[0048] FIGS. 15A-C are rear perspective, partial side cross-section and rear views of another alternative adapter assembly in accordance with a different embodiment of the invention;

[0049] FIGS. 16A-C are rear perspective, partial side cross-section and front perspective views of another alternative adapter assembly in accordance with a different embodiment of the invention;

[0050] FIGS. 17A-C are rear, side and rear perspective views of another alternative adapter assembly in accordance with a different embodiment of the invention;

[0051] FIGS. 18A-D are rear, front, side, rear and front perspective views of another alternative adapter assembly in accordance with a different embodiment of the invention.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

[0052] An adapter assembly in accordance with a preferred embodiment of the invention is shown in FIGS. 5 to 12 of the accompanying drawings. Where the same component is shown in multiple figures, the same reference numbers are used.

[0053] The adapter assembly is suitable for securing a luminaire to a niche formed in a wall of a pool or spa. It could, however, also be used for other purposes, such as in aboveground lighting in a path or driveway.

[0054] The adapter assembly 10 comprises a mounting bracket 12 and three clamping devices 14. The mounting bracket 12 has a rear portion 16 which is shaped and sized to fit within the niche 18 (see FIG. 12) and a front portion 20 comprising a peripheral flange 22 sized to engage the wall 24 (see FIG. 12) surrounding the niche 18. The mounting bracket 12 is configured to enable a luminaire (not shown) to be secured thereto and be visible from a front side of the mounting bracket.

[0055] The three clamping devices 14 are positioned equally around a central axis of the mounting bracket 12. Each clamping device 14 is attached to the rear portion 16 of the mounting bracket 12 and comprises a clamping arm 26 and drive member 28. The drive member 28, in the form of a threaded bolt 30, is arranged to engage a threaded nut 32 captured within the clamping arm 26. In the embodiment shown, the bolt 30 is 6 mm in diameter and has a metric screw (referred to as M6) and the nut 32 has a corresponding M6 internal thread. However, any alternative size and/or thread, imperial or metric, could instead be used.

[0056] In the embodiment shown, the M6 nut is captured within the material of the clamping arm 26 at the time of manufacture, so it cannot be lost during installation.

[0057] The bolt 30 has a head 34 which projects through an aperture in the mounting bracket 12 and be accessible from the front side of the mounting bracket 12 when positioned within the niche 18. In the embodiment shown, the head 34 is configured to be engaged by a Phillips head screwdriver such that the bolt 30 is operable with a conventional manual or powered screwdriver to drive the clamping arm 26 towards an internal wall 36 of the niche 18, to thereby secure the mounting bracket 12 to the niche 18. It will be appreciated however that provision for a flat-blade screwdriver could alternatively be provided.

[0058] In the embodiment shown in FIGS. 5 to 12, the clamping arm 26 is pivotally connected to the mounting bracket 12 about an axis A (see FIG. 9) such that rotation of the threaded bolt 30 causes a free end of the clamping arm 26 to move in an arc, forwardly towards the front of the mounting bracket 12 as it moves outwardly away from the central axis of the mounting bracket and towards the internal wall 36 of the niche 18 (see FIG. 10). This combined movement causes the mounting bracket 12 to be drawn into the niche 18 and the peripheral flange 22 of the mounting bracket to be drawn towards the pool wall 24 (see FIG. 12) surrounding the niche 18.

[0059] FIG. 9 of the accompanying drawings shows the clamping device 14 in an initial, inoperative position, with the clamping arm 26 at a most extreme end of its travel range, abutting a hard stop 38. This position provides the most clearance from the internal wall 36 of the niche 18 to facilitate easy installation.

[0060] Conversely, FIG. 10 shows the clamping device 14 in an operative position, with the clamping arm 26 at the opposite extreme of its travel range, abutting a second stop 40. This position provides interference to the niche wall 36 (see FIG. 12) and thus applies maximum clamping force against the niche wall.

[0061] The interference fit is also depicted in FIG. 12 wherein multiple niche bore sizes are overlayed.

[0062] FIG. 11 depicts the clamping arm 26 at its two extreme positions. In this figure, and also by comparing FIGS. 9 and 10, it can be seen that the bolt 30 pivots about an axis B. As the bolt 30 is rotated about its own longitudinal axis, the orientation of this axis pivots about axis B as shown. A conical washer 42 is provided to allow the head 34 the bolt 30 to travel over a bearing surface 44 such that compression between the head 34 and the nut 32 causes the clamping arm 26 to rotate about axis A and thereby pull against the surface of the internal wall 36 of the niche 18 as shown in FIG. 12.

[0063] For consistency with conventional screw threads, clockwise rotation of the bolt 30 causes the arm 26 to move upwards, with reference to the orientation shown in the figures, and anticlockwise rotation causes the arm 26 to move downwards (away from the niche wall).

[0064] In the embodiment shown in FIGS. 5 to 12, the clamping arm 26 is made of a rigid substrate material 46 and the free end of the arm is over-moulded with a flexible material 48. This arrangement provides a degree of compliance, and thus a flexible interface, as the free end of the clamping arm 26 engages the internal wall 36 of the niche 18. The flexible interface is then able to conform to uneven surfaces of the internal walls of the niche. The over-moulding process also allows for a manufactured part that is injection moulded and does not require further manual assembly or adjustment by the installer.

[0065] In the embodiment shown in the figures, the flexible material 48 is provided with an asymmetrical toothed or notched profile 50 to increase grip with the internal wall of the niche. The asymmetrical shape provides a greater degree of friction with the internal wall 36 in one direction than in the other direction, to thereby resist unintended removal of the adapter assembly 10 from the niche 18.

[0066] The preferred embodiment of the adapter assembly includes three independently adjustable clamping devices 14, each having a defined travel path controlled by independent drive members 28. The assembly can thereby cater for a relatively wide range of niche size variations to provide a secure mechanical retention, while providing even and distributed load around the niche diameter.

[0067] Some key advantages of the preferred form of the adapter assembly include: [0068] universal fit to all major swimming pool niches (concrete pools); [0069] universal fit to all variations of major niches for vinyl and fibreglass pool constructions; [0070] applies even, distributed pressure to ensure a secure fixing and prevent damage to the mating niche; [0071] flexible interface of clamping arms provides secure grip on plastic and metal formed niches; [0072] toothed or notched profile of the flexible face of the clamping arms aids friction with the internal wall of the niche. The combination of a flexible interface over a rigid clamping arm allows for the force to be applied at the point of contact and to the greatest surface area between the clamping arms and niche wall; [0073] three independent points of adjustment ensures even and secure fixing even when variation, debris or other foreign items are present in the existing niche, which would otherwise prevent installation; [0074] can secure at an angle to the original niche, enabling the luminaire to mount flush with the pool wall, potentially correcting previously misaligned luminaires; [0075] does not disturb the original sealing method; [0076] plastic materials provide robust support while avoiding crevice and/or galvanic corrosion with the mating niche; [0077] the three clamping arms move in such a way so as to pull the adaptor plate into the niche as the clamping devices are adjusted; [0078] each clamping devices is adjusted by a single threaded bolt; [0079] the clamping devices allow for individual adjustment to suit variations in niche size, geometry and conditions for cases where concrete debris has set inside the niche that could prevent normal installation without repair; and [0080] uses only readily available tools for installation.

[0081] FIGS. 13A to 18D show alternative adapter assemblies in accordance with other embodiments of the invention.

[0082] FIGS. 13A-C show a rear view of an adapter assembly which operates similar to the way in which drum brakes work in vehicles. Two semicircular shoes 52 expand outwards to engage the internal wall of the niche to which the adapter assembly has been installed. In this case a single screw 54 drives a wedge 56 outward (away from a central axis of the assembly) with two bearing surfaces 58 forcing the two semicircular shoes 52 that pivot against the internal walls of the niche. The outwards pressure exerts a clamping force into the niche walls thus securing the luminaire into the niche. When the screw 54 is wound in a reverse direction it draws the wedge inwards to release the clamping shoes 52 from the niche walls and allow removal from the niche.

[0083] FIGS. 14A-D show another adapter assembly which is a variation of the drum brake concept shown in FIGS. 13A-C. A drive screw 60 acts upon a single semicircular arm 62 that pivots outwards into the bore of the niche. The expansion of the pivoting arm 62 outwards causes the rear portion 64 of the adapter assembly to expand against the opposing surfaces of the niche wall in order to spread the load across a wider surface area of the niche. The expansion of the pivoting arm 62 provides enough force such that the adapter assembly is locked into the niche until the screw 60 is unwound to release the force and allow removal.

[0084] FIGS. 15A-C depict another concept in which four independently adjustable clamping devices 66 rotate as a screw 68 is wound tight to compress a flexible cylindrical block 70, forcing it to expand outwardly and make contact with the inside wall of the niche. The head of each screw 68 is able to be accessed from the front of the adapter assembly and acts on the cylindrical block 70 that, when compressed, bellows symmetrically to make contact with the inside wall of the niche. The flexible block provides a greater level of surface contact than a polymeric material as it conforms to the opposing surface structure of the niche. The four points of contact allow for variability in the niche to mounting bracket concentricity and variability in the niche form.

[0085] FIGS. 16A-C depict a variation on the concept depicted in FIGS. 15A-C. In this variation, four independently adjustable wedges 72, controlled by screws 74, engage the internal wall of the niche to which it has been installed. The wedges 72 are made of a flexible material with a degree of compliance such that the material expands outward when compressed by the screw 74. Alternatively, each screw, when wound, may engage with a bearing block such that the wedge 72 slides outwards, away from the central axis of the assembly, towards the niche wall. The flexible block 72 provides a greater level of surface contact than a polymeric material as it conforms to the opposing surface structure of the niche.

[0086] FIGS. 17A-C depict another variation. In this variation a mounting frame comprises of a concave metal plate 76 with several contact points to meet with the inside bore of the niche. A drive member in the form of a threaded bolt 78 axially aligned to the niche and mounting frame provide force to drive the plate 76 from a domed profile to a flat profile. In this adjustment range the edges of the plate 76 act upon the niche wall and the contact points engage as the profile changes and the threaded bolt 78 is tightened. If the bolt 78 is wound back the flattened shape is returned to its normally concaved profile and the retention into the niche is lost, thereby allowing the mounting frame to be removed.

[0087] FIGS. 18A-D depict yet another variation. In this concept a central rotating ring gear 80 with four cam surfaces 82 operates on four outwardly-projecting interface blocks 84. A screw 86 rotates the central ring gear 80 which then acts upon the four independent blocks 84 to make contact with the niche wall. More specifically, the screw 86 transfers forces to the ring gear 80 with the four identical cam surfaces 82 that translate the forces equally in the four directions to cause the interface blocks 84 to meet with the inside bore of the niche. The clockwise motion of the ring gear 80 and cams 82 act to secure the adapter assembly to the niche, and the opposite counter clockwise motion releases the assembly.

[0088] Although preferred embodiments of the invention are described herein in detail, other variations would become apparent to persons skilled in the art. In each variation, an adapter assembly comprises a mounting bracket and some sort of clamping device. The mounting bracket has a rear portion shaped and sized to fit within the niche and a front portion comprising a peripheral flange sized to engage the wall surface surrounding the niche. The mounting bracket is configured to enable a luminaire to be secured thereto and be visible from a front side thereof. The clamping device(s) attached to the rear portion of the mounting bracket are configured to secure the mounting bracket to the niche. All such variations are considered to fall within the spirit of the invention and the scope of the appended claims.