CLIAMS:1. A movable lighting system assembly comprising light carrier unit(s) from ceiling roof beam wherein said light carrier unit(s) connected with sling rope and supply cable are allowed to move vertically maintaining the safety measures with rope and pulley arrangement, comprising:
- at least one pulley designed to move said light carrier unit vertically;
- at least one stopper plate fixed at the top of said pulley to restrict the movement of said pulley from its own position during operation;
- at least one U-hook accumulating said pulley and stopper plate;
- at least one base plate attaching said U-hook at the ceiling roof beam; and
- plurality of sliders at predefined regular intervals from the bottom of said pulley to the top of said light carrier unit;
wherein each said sliders comprises at least two holes, grips said supply cable from the first hole with nut and bolt and freely passes said sling rope from the second hole to coil the supply cable between said light carrier unit and the pulley during the normal operations and uncoil the supply cable uniformly during maintenance of said light carrier unit(s).
2. The system assembly as claimed in claim, wherein said sliders are wooden block of preferable size.
3. The system assembly as claimed in claim 1, further comprises a locking arrangement maintaining the safety measures of said assembly comprising:
- at least one stopper ring to limit the light carrier unit(s) beyond a desired height from the ground level through the sling rope;
- at least one safety ring connected with the sling rope;
- at least one locking plate locking said safety ring during normal operations of light carrier unit(s); and
- at least one locking rod holding the light carrier unit(s) though the said safety ring and sling rope;
wherein said safety ring rests on said locking rod to lock with said locking plate preventing mal-operation during normal operations of light carrier unit(s).
4. The system assembly as claimed in claim 3, wherein said locking arrangement is preferably supplemented by lock and key to prevent unauthorized use.
5. The system assembly as claimed in claim 1, wherein optionally poly propylene rope is attached to the said safety ring during maintenance before unlocking the said safety ring from the said locking rod followed by tying of said poly propylene rope with the locking rod for maintenance of said light carrier unit(s).
6. The system assembly as claimed in claim 1, further comprises electrical switches preferably fixed on the side wall of the construction for operations.
7. The system assembly as claimed in claim 1, wherein plurality of said light carrier units is connected with sling rope and supply cable at predefined intervals comprising rows and/or columns to illuminate the required area achieving aesthetic look.
8. The system assembly as claimed in claim 1, wherein optionally separate electrical ground can be provided for the individual light carrier unit and sling rope in the system to prevent short circuit and safety.
9. The system assembly as claimed in claim 1, further comprises i hooks in between two opposite side walls to hang Galvanized Iron wire for running the supply cable at the top of the ceiling roof beam.
10. The system assembly as claimed in claim 1, wherein said supply cables are concealed.
11. The system assembly as claimed in claim 1, wherein said light carrier unit preferably is metal halide carrier unit comprising reflector and control gearbox.
12. The system assembly as claimed in claim 1, wherein the said assembly optionally adjusts the angle of light carrier unit(s) to illuminate the desired area in a preferable manner.
13. The system assembly as claimed in claim 1, wherein the said assembly of is applied in any indoor stadium, outdoor stadium, inside the shop floor, high level tank, large project area, inside auditorium or the like.
,TagSPECI:TECHNICAL FIELD OF THE INVENTION
The present invention, in general, relates to the field of low cost movable lighting system arrangement which can be used in stadium. More particularly, the invention relates to a movable lighting system arrangement where light carrier units are fixed at the top of the building roof, which can be brought down to ground level for maintenance by means of operating sling rope and pulley.

BACKGROUND AND THE PRIOR ART
The traditional indoor stadium lighting system is a fixed bur (tube light) lighting system which was string via Galvanized Iron (GI) wire in between two walls and maintenance is done with the help of ladder or trolley which in turn is restricted due to the wooden floor. All the luminaries were fixed at a height of 10 feet. Distribution of light is not uniform. The illumination of bur lights is not up to the mark for day to day and national level games. Frequency of failure of bur lighting was more and maintenance became a problem due to requirement of ladder or trolley, which is unsafe. Maintenance problem is there due to restriction in trolley movement over the wooden flooring. Multiple tube light fittings require multiple attentions in terms of maintenance and breakdown solution. This led to manpower wastage and increased maintenance costs.
The existing indoor stadium lighting can not be maintained from time to time since its inception because of the huge height of the building. The existing methodology of lighting provides insufficient and non-uniform light in the playing court. Further the life of the tube lamp is less and it requires lots of maintenance, which is to be done with the help of ladder or trolley to do the work at height, which is an unsafe practice. Lighting of the stadium and its maintenance is a challenge to us owing to the constraints of height (36 feet) at the ceiling roof and large area of the building. Maintenance problem is there due to restriction in trolley movement over the wooden flooring of the existing art.
Again excess manpower and time is required for climbing & doing maintenance jobs. Climbing and work at huge height led to fatal accidents in existing method of lighting of stadiums. Transportation of ladder & trolley is also a problem in existing art resulting in delay in attending to complaints. During maintenance sports activities can not be done because ladder and trolley occupied a lot of space.
US 6155696 discloses a lighting system is adapted to receive lighting fixtures and is capable of being raised and lowered along the length of an attendant pole which has a longitudinal axis is moved by a transport mechanism having a plurality of cables which extend from the lighting system to the base of the attendant pole. The lighting system includes at least one support member is which is co-axially aligned with the longitudinal axis of the pole. Further included is a pair of transverse members which are oriented substantially parallel to each other and are attached by a plurality of cross-members extending there between. Each of the pair of transverse members is disposed on opposite sides of the at least one support member.
CN 203364046 discloses remote-control type lifting projection lamp comprising a lamp cap, an electrical appliance box, a lifting body box and a remote controller, wherein a main control circuit board is arranged in the electrical appliance box; a lamp cap lifting assembly and an upper conductive terminal assembly are arranged in the lifting body box; the electrical appliance box and the lifting body box are in fastening connection by a bolt; a lower conductive terminal assembly and a roller wheel are arranged on the lamp cap; the roller wheel is arranged on a roller wheel bracket by a roller wheel pin roll; the roller wheel bracket is fixed on the lamp cap. The Chinese patent application is costly due to its lifting mechanism and use of motors, gear and shaft arrangement. The present invention by using simple method of indoor stadium light lifting arrangement, break down on account of motor / gear box had been completely eliminated.
Hence there is need of a reliable and cheap moving lighting assembly arrangement where light carrier units are fixed at the top of the building roof to enable the easy maintenance and cleaning of the lights maintaining the safety measures so that the user can bring down the light fitting units (carrier units) to the ground level for maintenance and take it back after maintenance to its original position without the use of any ladder or trolley and any external equipment.
The present invention provides a new arrangement of moving lighting system where the light carriers and cables are allowed to move vertically with a special construction of wooden sliders so that cables are coiled at the top of light carrier unit with the help of wooden sliders.
OBJECT OF THE INVENTION
The prime object of the present invention is to overcome one or more of the drawbacks of the related prior art.
It is an object of the present invention to provide a moving lighting system which can be moved up to ground level without any ladder or trolley, avoiding any damage to wooden floor inside indoor stadium.
Another object of the present invention is to provide a moving lighting arrangement for lifting and bring down the light carrier units fixed at the top of the building roof up to the particular level from ground.
Yet another object of the present invention is to provide uniform distribution of light to generate aesthetic look inside stadium so that quality level indoor sport competition and better illumination inside the shop can be done.
It is a further object of the present invention to maintain safety measures in the lighting system so that they can prevent accidental damage.
Another object of the present invention is to adjusting height of light carrier units as per requirement of different indoor games.
Yet another object of the present invention is to achieve drastic reduction of utilization of manpower and maintenance cost.
These and other objects of the present invention will become readily apparent from the following detailed description read in conjunction with the accompanying drawings.

SUMMARY OF INVENTION
The following presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention.
According to one of the aspect of the present invention there is provided movable lighting system assembly comprising light carrier unit(s) from ceiling roof beam wherein said light carrier unit(s) connected with sling rope and supply cable are allowed to move vertically maintaining the safety measures with rope and pulley arrangement, comprising:
at least one pulley designed to move said light carrier unit vertically;
at least one stopper plate fixed at the top of said pulley to restrict the movement of said pulley from its own position during operation;
at least one U-hook accumulating said pulley and stopper plate;
at least one base plate attaching said U-hook at the ceiling roof beam; and
plurality of sliders at predefined regular intervals from the bottom of said pulley to the top of said light carrier unit;
wherein each said sliders comprises at least two holes, grips said supply cable from the first hole with nut and bolt and freely passes said sling rope from the second hole to coil the supply cable between said light carrier unit and the pulley during the normal operations and uncoil the supply cable uniformly during maintenance of said light carrier unit(s).

In another aspect of the present invention there is provided a locking arrangement maintaining the safety measures of the assembly comprising:
at least one stopper ring to limit the light carrier unit(s) beyond a desired height from the ground level through the sling rope;
at least one safety ring connected with the sling rope;
at least one locking plate locking said safety ring during normal operations of light carrier unit(s); and
at least one locking rod holding the light carrier unit(s) though the said safety ring and sling rope;
wherein said safety ring rests on said locking rod to lock with said locking plate preventing mal-operation during normal operations of light carrier unit(s).

In a non-limiting embodiment of the present invention the present invention consists of an assembly of the following components:
(i) a base plate on which the U hook is welded and fixed at the top for holding pulley through which sling rope can be moved up and down.
(ii) U hook (on which the pulley and stopper plate are fitted) help to fixed pulley at the top of the ceiling roof beam through nut bolt of the base plate.
(iii) a stopper plate is fixed at the top of the pulley to restrict the movement of pulley from its own position during operation.
(iv) a system pulley which is designed specially for this purpose to move the light carrier unit up and down for maintenance work
(v) wooden slider is used to hold the cable for coiling at the top position and to pass the sling rope to move the light carrier unit from top to down for maintenance.
(vi) a safety stopper is used to hold the light carrier unit at a certain height which is comfortable for a person of normal height at the time of maintenance .
(vii) a locking rod is used to hold the light carrier units with the help of a safety ring and sling rope at the required height of operation.
(viii) locking plate is provided to lock the safety ring on it to prevent mal-operation during normal time.
(ix) “I” hooks are fixed in between walls to hang GI wire for running supply cable on it at the top of the roof.
(x) electrical switches are fixed at the side wall to control the light carrier units during requirement.
In an exemplary embodiment of the present invention there provided a poly propylene rope is attached to the said safety ring during maintenance before unlocking the safety ring from the locking rod followed by tying of said poly propylene rope with the locking bolt for maintenance of said light carrier unit(s).
In a preferred embodiment of the present invention plurality of said light carrier units is connected with sling rope and supply cable at predefined intervals comprising rows and/or columns to illuminate the required area achieving aesthetic look
To enable the invention to be more clearly understood and carried into practice, reference is now made to the accompanying drawing in which like references denote like parts throughout the description.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
An embodiment of the invention will now be described, by way of example with reference to the accompanying drawings, in which:
Figure-1 represents a schematic diagram illustrating top view of conventional indoor lighting system.
Figure-2 represents a schematic diagram illustrating side view of conventional indoor lighting system
Figure-3 illustrates top view of lighting assembly and arrangement of the present invention.
Figure-4 shows side view of movable lighting assembly and arrangement of the present invention.
Figure-5 depicts movable lighting system of the present invention while in working mode.
Figure-6 depicts movable lighting system of the present invention while in maintenance mode.
Persons skilled in the art will appreciate that elements in the figures are illustrated for simplicity and clarity and may have not been drawn to scale. For example, the dimensions of some of the elements in the figure may be exaggerated relative to other elements to help to improve understanding of various exemplary embodiments of the present disclosure. The drawings are not to scale (unless so stated) and are intended for use in conjunction with the explanations in the following detailed description.
Throughout the drawings, it should be noted that like reference numbers are used to depict the same or similar elements, features, and structures.

DETAILED DESCRIPTION OF THE INVENTION
The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of exemplary embodiments of the invention as defined by the claims and their equivalents. It includes various specific details to assist in that understanding but these are to be regarded as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.
The terms and words used in the following description and claims are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the invention. Accordingly, it should be apparent to those skilled in the art that the following description of exemplary embodiments of the present invention are provided for illustration purpose only and not for the purpose of limiting the invention as defined by the appended claims and their equivalents.
It is to be understood that the singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise.
By the term “substantially” it is meant that the recited characteristic, parameter, or value need not be achieved exactly, but that deviations or variations, including for example, tolerances, measurement error, measurement accuracy limitations and other factors known to those of skill in the art, may occur in amounts that do not preclude the effect the characteristic is intended to provide.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments and/or in combination with or instead of the features of the other embodiments.
It should be emphasized that the term “comprises/comprising” when used in this specification is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps, components or groups thereof.
It should also be emphasized that in the present invention normal mode of operation of the system assembly is considered as the working of the system assembly to provide light from the desired height in the stadium or building whereas the maintenance mode of operation is the bringing down the system assembly at lower height for maintenance of the light carrier unit i.e. system assembly of the present invention can bring the light carrier at top during normal use and can bring down to ground level for maintenance.
The advantages, nature, and various additional features of the invention will appear more fully upon consideration of the illustrative experiment now to be described in detail in connection with accompanying drawings.
Figure-1 and Figure-2 shows the top and side view of the lighting arrangement of the existing prior art respectively where the tube (bur) lighting (100) is string via Galvanized Iron (GI) wire in between two walls (101). All the luminaries were fixed at a height (hx) (for example 10 feet). The lighting of the stadium and its maintenance is a challenge owing to the constraints of huge height (H) (for example 36 feet) at the ceiling roof and large area of the building. In figures L, B, H represents the length breadth and height of the stadium or the concerned room. Maintenance problem is there due to restriction in trolley movement over the wooden flooring (102). Figure-1 and Figure-2 provides tube light assembly in a fixed position system where the maintenance is done with the help of ladder or trolley.
Figure-3 and Figure-4 depicts the top and side view of the lighting arrangement of the present invention respectively. In figures L, B, H represents the length breadth and height of the stadium or room. In an exemplary embodiment of the present invention metal halide light carrier units (200) in each row in equal distance is placed homogenously and likewise plurality of row is made to illuminate the whole indoor stadium. In non-limiting aspect of the present invention light carrier unit (200) are fixed at the top of the building roof (203) controlled through the side wall (201) of indoor stadium so that control can be done from ground level. Light carrier unit (200) that can be reached to the desired height level (hx) and brought back to a desired height (hy) from the ground level for maintenance without any ladder or trolley. Maintenance can be done at ground level without any ladder or trolley, avoiding any damage to wooden floor (202) inside indoor stadium. It is required to mention that the present invention is not limited to type of lighting carrier units and number of rows and distance between the two carrier units where the arrangement of the present invention can be applied for a bigger size and any height of indoor stadium.
Figure-5 provides the view of the movable lighting system assembly during normal operation mode which includes all the necessary arrangement required for movement of the light carrier unit (200) without any gear arrangement (as done in prior art). In the present invention light carrier unit (200) comprises metal halide bulb (M), control gearbox (218) for electrical starter and reflector (219) assembled with plurality of wooden sliders (217), where the supply cable (213) is kept coiled by the wooden sliders (217). It is needed to mention here that the control gearbox (electrical) of the present invention is not same as the mechanical gear arrangement for moving the light assembly as mentioned in the prior conventional system. It is well known to a person skilled in art that the control gearbox is an electrical component required for metal halides and not a mechanical gear box. Further gear control box (218) is nothing but the chock, ignitor and fuse unit which are required to supply power to make the metal halide filament glow.
Figure-6 shows how the supply cable (213) is uncoiled and coming down with light carrier unit (200) to the height (hy) from the ground level (202). Pulleys (214) are attached to the top of the ceiling roof beam (203) with the help of base plate (210). Pulleys (214) are fixed on top of the roof to guide the sling rope (215) and to support supply cable (213) to move up and down. The movable lighting system assembly of the present invention wherein light carrier units are fixed at the top of the ceiling roof beam (203) can be brought down to ground level at height (hy) from the ground level (202) for maintenance by means of operating sling rope (215) and pulley (214).
In a preferred embodiment of the present invention the movable lighting system assembly further comprises a sling rope (215), pulleys (214), stopper plate (212), safety ring (222), stopper safety ring (216) embedded with a U-clamp (230) for providing support and guidance to sling rope (215) for easy movement from top to bottom by displacement of sling rope (215) longitudinally. Safety ring (222) is attached to light carrier unit through sling rope (215) and poly propylene rope (pp rope) (228) is to be tied up safely with safety ring (222) before unlocking the safety ring (222) at the ground level from locking arrangement. PP rope (228) is slowly released up to stopper safety ring (216) and the pulley (214) guides the sling rope (215) to ground level until the light carrier unit (200) reaches to desired level (hy) from the ground level. Suitably there is “I” hooks (235) in between two opposite side walls to hang Galvanized Iron wire for running the supply cable (213) at the top of the ceiling roof beam (203).

Working of the present invention:
In a non-limiting embodiment of the movable lighting assembly of the present invention base plate(s) (210) are provided for supporting pulley and the pulley (214) is fixed by lock pin with nut bolt arrangement (232) at the top of ceiling roof beam (203). The pulley (214) guides the sling rope (215) during lifting of the light carrier unit (200) to the desired height (hx) and brings it down to height (hy) from the ground level (202) during maintenance. The stopper plate (212) restricts the excess movement of pulley (214) during up and down operation where the wooden block/ sliders (217) separate the supply cable (213) and sling rope (215) to prevent twisting with each other during up and down operation and to help in the coiling of supply cable (213). The safety stopper ring (216) is fixed at the top of the side wall (201) to limit the descent of the light carrier unit (200) up to desired level (hy) through the attached sling rope (215). This makes it suitable for a normal person to do the maintenance work at ground level. The safety stopper ring (216) prevents accidental touching of light carrier unit (200) to the ground during mal-operation. The safety stopper ring (216) is used for support and guidance of the sling rope (215) during down and up sliding operation. Preferably, a cable holder (231) is provided in the pulley plate (227). Cable holder (231) is use to tie the cable (213) with pulley plate (227) at the top, to carry the cable weight partially and guide the cable (213) to move up and down.
The safety ring (222) rests on the locking rod (233) and keeping the light carrier units (200) at the top of the ceiling during normal use of light. Safety ring (222) locks with locking plate (221) through locking rod (233) and fixed nut/locking bolt (223) preventing the mal-operation in the lighting system assembly of the present invention. The electrical control switches (220) are fixed on the side wall (201) of the building/stadium for operation from ground level during requirement. There is separate earthing connection is provided for individual light carrier unit (200) and sling rope (215) in the system assembly to prevent short circuit and as a safety measure.
During regular use of lighting, cables are coiled at the top of light carrier unit (200) with the help of wooden slider/ block (217). In an exemplary embodiment of the present invention the wooden slider is 76 x 152 x 25 mm size wooden block, it is used to grip the total supply cable (213) via nut and bolt (234), from below the top-pulley (214) upto the top of light carrier unit (200) at a distance of around 700mm interval and allow free pass of sling rope (215), which will make the supply cable (213) to form coil at the top of the light carrier unit (200). When sling rope (215) are pulled light carrier unit (200) are allowed to move from the ground level (202) to a height (hx) (below the pulley) by passing sling rope (215) through wooden block/ sliders (217) and keep the supply cable (213) in coil form at the top. When the light carrier units (200) are brought down for maintenance sling ropes (215) are allowed to pass through wooden block/sliders (217) and supply cable (213) is allowed to be uncoiled. Further a U clamp (226) is preferably attached at the sling rope (215) just above the light carrier unit (200) for maintaining the safety measures. U clamp (226) is use to tie the end of sling rope (215) to fixed light carrier unit (200) with the nut bolt attached with it.
Due to weight of light carrier unit (200) and centre of gravity it is easy to bring the light carrier unit (200) to ground level. The supply cable (213) is not allow to move through the pulley (214) (which is in the prior art) thus the damage of the supply-cable (213) and leakage of current are eliminated. In the present system the supply cables (213) are concealed so that the tampering of supply cable (213) is also avoided. Preferably the concealing is PVC concealed wiring (204). Aesthetic look inside stadium is achieved and made suitable for playing games. The safety stopper (216) does not allow the light carrier unit (200) to touch the ground, which prevents accidents and damage of light carrier units (200). Lock (224) and key is preferably used to operate sling rope (215) so that unauthorized persons can not operate the system assembly.
In a non-limiting aspect of the present invention Poly Propylene rope (PP rope) (228) is tied up safely with safety ring (222) before unlocking the safety ring (222) from locking bolt (223). Poly Propylene (228) is attached to sling rope (215) with the safety ring (222). After unlocking the safety ring (222), the PP rope (228) is to be released slowly downwards until the lighting carrier unit (200) is reached to desired level or height and then the PP rope (228) is tied with the locking rod (233) to hold it for maintenance. After the maintenance work is over the light fitting (carrier unit) is finally checked, then the poly propylene rope (228) is pulled from ground level height (hy) to move the light carrier unit (200) to its original height (hx). Light carrier unit (200) can be brought down to height (hy) from the ground level with longitudinal displacement of sling rope (215). Wooden blocks/sliders (217) are placed in between the pulley (214) and light carrier unit (200) to separate and to prevent twisting of sling rope (215) and supply cable (213) during up and down operation of light carrier unit. The wooden blocks/sliders (217) also help in the coiling of supply cable (213) at the ceiling top.
In a non-limiting embodiment of the present invention two earthings have been made, one is connected to the sling rope (215) and other is connected to all light carrier unit (200) to take care of short circuit and human safety. As a precautionary measure during sliding, PP rope (228) is to be wound around the locking rod (233) and the light carrier unit is to be released at slowly up to ground level and no person should stand under the light carrier unit during sliding of sling rope (215). After completion of maintenance work, safety ring (222) is to be locked and main switch to be made ON from control switch (220).
As a non limiting aspect of the present invention only 3 persons can perform the maintenance work. Maintenance can be done immediately with minimum manpower and minimum time. After maintenance work is over, pp rope can pull back the light carrier unit to its normal height.
Example cases and advantages:
It is a unique system of lighting, which is incorporated for the first time in the indoor stadium. This is a lighting system with rope and pulley arrangement, which can be placed in position by operating from ground level. Maintenance can be done at ground level without any ladder or trolley, avoiding any damage to wooden floor inside indoor stadium.
Estimated annual saving under labour head is around Rs. 1,21,500/- and total savings by the present invention can be up to around Rs = 9,00,500/-. Any reduction in man power and maintenance helps in improving the bottom–line of the company. In indoor stadium lighting system maintenance time has been reduced because immediate maintenance is possible without any trolley or ladder. Further the utilization of maintenance area is reduced by the present invention because no trolley or ladder is used.
There is no need for climbing to a height for maintenance work, as a result fatal accidents are avoided. In the present invention lighting height and angle can be adjusted as per requirement. Desired illumination of 750 lux is achieved and uniform lighting is provided inside the stadium. Use of metal halide fittings (carrier units) its increases the life of lighting system and reduces maintenance cost. Other type of lights can be used as per requirement.
In an exemplary embodiment of the present invention fixed 400watt of metal halide light carrier unit (at least 5) in each row in equal distance and total 5 number of row is made to illuminate the whole indoor stadium. The same principle can be applied for a bigger size and height of indoor stadium also. The basic concept of using this system is that it eliminates transportation of ladder / trolley in the restricted area (like indoor stadium, shop floor etc.) and minimum man power and time are required for maintenance as a result maximum amount of complaints can be attended to within minimum time with less man power and the arrangement of the present invention saves cost under labour head (approximately Rs. 1,21,500/ - per year). In a non-limiting aspect of the present invention, the arrangement of the present invention can be used in any indoor stadium, outdoor stadium, inside the shop floor, high level tank, large project area and inside auditorium.
Although the invention has been described with reference to particular examples of the invention, it should be appreciated that it may be exemplified in other forms. The invention qualifies to be adopted in a variety of other embodiments such modifications and alternatives obtaining the advantages and the benefits of the present invention will be apparent to those skilled in the art. All such modifications and alternatives will be obvious to a person skilled in art.
The description herein contains many specifics; these should not be construed as limiting the scope of the invention, but as merely providing illustrations of some of the embodiments of the invention. One of ordinary skill in the art will appreciate that elements and materials other than those specifically exemplified can be employed in the practice of the invention without resort to undue experimentation. All art-known functional equivalents, of any such elements and materials are intended to be included in this invention. Numerous variations, changes and substitutions may be made without departing from the invention herein.