Abstract:
A covering and mounting structure for mounting a motion detector having electronic adjustment controls, light emitting diodes (LEDs), and at least one motion detector lens, provides for selectively covering the controls, LEDs and a motion detector lens. The structure can be cylindrical or non-cylindrical in shape, and disposed in pendant or standing-post arrangement. Furthermore, the structure includes a telescopic structure or an exterior cover for the selective covering. In one embodiment, the structure includes one downwardly viewing first motion detector lens and a laterally viewing second PIR motion detector lens.

Description:
TECHNICAL FIELD  
         [0001]    The invention relates generally to a covering and mounting structure for a motion detector having light emitting diodes (LEDs) and electronic adjustment controls. It relates, in particular, to two motion detector lenses mounted on the covering and mounting structure disposed in pendant arrangement such that the covering and mounting structure allows selective concealment of the LEDs, electronic adjustment controls and motion detector lenses.  
         BACKGROUND OF THE INVENTION  
         [0002]    A motion sensor is typically mounted on a wall, eave, ceiling or post location. The sensor includes electronic adjustment controls with variable settings to adjust the electronic and/or optical performance of the product. Also included on the sensor are light emitting diode (LED) indicators, which indicate the electronic status of the product. Additionally, physical masking of a passive infra-red (PIR) lens on the sensor is included. The masking limits the detection area covered by the sensor. Furthermore, detection directional control is commonly achieved by aiming the sensor in the appropriate general direction. Such directional adjustment has been achieved via mechanical joints.  
           [0003]    The motion detector may be electrically connected to devices such as security, lighting, audio alarms, and the like. These devices can be bodily incorporated with the motion detector or the motion detector may be a separate stand-alone unit.  
           [0004]    Prior art combined motion detector and security lighting devices typically comprise a mounting plate equipped with at least a motion detector and at least one security light. U.S. Pat. No. Des. 424,727 discloses an ornamental design for a combined motion detector and security lighting device. Two spotlights are disposed above a motion detector.  
           [0005]    Prior art devices include electronic adjustment controls which allow variable settings to adjust the electronic or optical performance of the device. These electronic adjustment controls are often covered to enhance the appearance of the device and to avoid exposure to environmental influences. These covers conventionally are separate plastic pieces which can easily drop off, get damaged or lost during installation, or during subsequent operation.  
           [0006]    The device can further include LED indicators which indicate the electronic status of the device. When light emitting diodes (LEDs) are employed, they are commonly on permanent display. However in certain applications, it is preferable to conceal them from sight.  
           [0007]    A PIR motion detector lens is employed to focus infra-red energy onto an internal sensor mechanism. Physical masking of the motion detector lens is often required to limit or regulate the detection area by partially covering the lens. Invariably this is achieved via the use of plastic parts. Whilst this solution may work, the masking material can easily be dropped, damaged or lost. In many cases, the replacement process is time consuming and sometimes a difficult assembly method is involved.  
           [0008]    Directional control of detection commonly requires existing sensors to be angled downward toward likely direction of motion activation. This results in a compromise of the detection efficiency, as the detection pattern lifts from the ground at the outer fringes (left and right) of the detection area.  
           [0009]    An objective of the present invention is to provide a robust, integrated and easy-to-use covering and mounting structure whereby the electronic adjustment controls, LED display, and motion detector lens, or part thereof, can be concealed selectively.  
           [0010]    Another objective of the invention is to provide a covering and mounting structure with enhanced detection capability.  
           [0011]    Yet, another objective of the invention is to provide a covering and mounting structure of an integrated aesthetic appearance, when compared with conventional design configurations.  
         SUMMARY OF THE INVENTION  
         [0012]    Accordingly, the invention provides certain improvement features to a prior art motion detector, particularly its covering and mounting structure.  
           [0013]    The fundamental improvement feature is to adopt a telescopic design for the covering and mounting structure, where no separate covering is required.  
           [0014]    One improvement feature is to incorporate two motion detector lenses on a covering and mounting structure disposed in pendant arrangement, where one lens is downwardly viewing and the other lens is laterally viewing.  
           [0015]    Another improvement feature is to allow the motion detector lenses to be utilised in a pendant arrangement, whereby the sensor body is always able to hang vertically down from ceiling or wall installations.  
           [0016]    Yet, another improvement feature is to incorporate one motion detector lens on a covering and mounting structure in a standing post arrangement, where the lens is laterally viewing.  
           [0017]    Still another improvement is that the product features can be selectively concealed by a covering structure when the telescopic design is not employed.  
           [0018]    According to the teaching of the invention, the covering and mounting structure can either be of telescopic or single body design. Furthermore, the covering and mounting structure can be disposed in pendant or standing post arrangement. In pendant arrangement, two motion detector lenses are employed, one is downwardly viewing and the other laterally viewing.  
           [0019]    Particularly in the case of a telescopic design disposed in pendant arrangement, the covering and mounting structure further comprises an inner tube or channel, an outer tube or channel and an intermediate tube or channel. The inner tube or channel carries a downwardly viewing first motion detector lens, and a laterally viewing second PIR motion detector lens above the first motion detector lens. The inner tube or channel also carries LEDs and electronic adjustment controls. The outer tube or channel serves to receive said intermediate and inner tubes or channels.  
           [0020]    In the case of a telescopic design disposed in standing post arrangement, only one laterally viewing second PIR motion detector lens is provided on the covering and mounting structure.  
           [0021]    Next, in the case of a single body design disposed in pendant arrangement, an exterior covering structure is employed to selectively conceal the product features. The shape of exterior covering structure must match and fit the shape of the mounting structure, and can be of circular, or non-circular shapes.  
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0022]    The invention will be described further, by way of three embodiments, with reference to the following drawings, in which:  
         [0023]    [0023]FIG. 1 shows a front view of a first preferred embodiment of the invention, depicting a telescopic cylindrical covering and mounting structure in pendant arrangement, with electronic adjustment controls, LEDs, a second PIR motion detector lens and a first motion detector lens, in a fully extended position.  
         [0024]    [0024]FIG. 2 a  shows a cross-section view of the embodiment as shown in FIG. 1. FIG. 2 b  shows an enlarged view of the area marked “A” in FIG. 2 a.    
         [0025]    [0025]FIG. 3 shows a front view of the embodiment as shown in FIG. 1, with the LEDs and the second PIR motion detector lens fully visible.  
         [0026]    [0026]FIG. 4 shows a front view of the embodiment as shown in FIG. 1, with the second PIR motion detector lens fully visible.  
         [0027]    [0027]FIG. 5 shows a front view of the embodiment as shown in FIG. 1, with the second PIR motion detector lens partly visible.  
         [0028]    [0028]FIG. 6 shows a cross-section view of the embodiment as shown in FIG. 5.  
         [0029]    [0029]FIG. 7 shows a front view of the embodiment as shown in FIG. 1, with the electronic adjustment controls, the LEDs and the second PIR motion detector lens in a concealed position.  
         [0030]    [0030]FIG. 8 shows a side view of the first embodiment shown in FIG. 1 being wall-mounted in a pendant arrangement.  
         [0031]    [0031]FIG. 9 shows a side view of the first embodiment shown in FIG. 1 being ceiling-mounted in a pendant arrangement.  
         [0032]    [0032]FIG. 10 a  shows a front view of a second preferred embodiment of the invention, depicting a single body cylindrical covering and mounting structure in pendant arrangement, with electronic adjustment controls, LEDs, and second PIR motion detector lens being selectively masked by an exterior covering structure.  
         [0033]    [0033]FIG. 10 b  shows a top view of the embodiment shown in FIG. 10 a.    
         [0034]    [0034]FIG. 11 shows a perspective view of the embodiment shown in FIG. 10 a.    
         [0035]    [0035]FIG. 12 shows a front view of a third preferred embodiment of the invention, depicting a telescopic cylindrical covering and mounting structure in standing post arrangement, with electronic adjustment controls, LEDs and second PIR motion detector lens in a fully extended position. 
     
    
     DETAILED DESCRIPTION  
       [0036]    For clarity, alphabets “a”, “b” and “c” are used to differentiate the three embodiments. For the sake of explanation, a first embodiment of the invention is elaborated in the form of a cylindrical telescopic covering and mounting structure  10   a  disposed in a pendant arrangement. The covering and mounting structure  10   a  is either wall-mounted or ceiling-mounted as shown in FIGS. 8 and 9, respectively.  
         [0037]    Referring first to FIGS. 1 and 2 a,  a cylindrical telescopic covering and mounting structure  10   a  is shown in its fully extended position. Electronic adjustment controls  11 , LEDs  12 , a second PIR motion detector lens  14  and a first motion detector lens  13  are carried on the covering and mounting structure  10   a.  The first motion detector lens  13  is downwardly viewing and provides a limited motion detection. The second PIR motion detector lens  14  is laterally viewing and provides wider motion detection.  
         [0038]    The covering and mounting structure  10   a  comprises an inner tube  1  an intermediate tube  2  and an outer tube  3 , and the three tubes  1 ,  2 ,  3  are telescopically assembled. The inner tube  1  carries the downwardly viewing first motion detector lens  13 , and the laterally viewing second PIR motion detector lens  14  above the first motion detector lens  13 . The inner tube  1  also carries the LEDs  12  and the electronic adjustment controls  11 , with the electronic adjustment controls  11  placed above the LEDs  12 . The outer tube  3  and the intermediate tube  2  serve to receive the inner tube  1 .  
         [0039]    A sensor bottom cover  15 , to which the electronic adjustment controls  11 , the LEDs  12  and the second PIR motion detector lens  14  are bodily connected, is allowed to move up and down, but limited by the position of the intermediate tube  2  and the outer tube  3 . These tubes  1 ,  2 ,  3  are attached together, with the assistance of mechanical structures such as clips, to create an enclosure in which the inner tube  1  is able to move. The intermediate and outer tubes  2 ,  3  are also the interface tubes, whereby these designs are adapted to provide the mechanical interface with the device to which the sensor is being applied.  
         [0040]    Now referring to FIGS. 2 a,    2   b  and  6 , a sensor top cover  18  is jammed or secured with a suitable mechanical connector between the intermediate and inner tubes  2 ,  1 . A horizontal protrusion  181  is provided around the internal circumference of the sensor top cover  18 . A plurality of grooves  151  is provided throughout the length of the inner tube  1  at predetermined intervals on its external circumference. The horizontal protrusion  181  engages appropriate grooves  151  on the up and down movement of the inner tube  1  at each adjustment position.  
         [0041]    An O-ring  17 , disposed in a pre-determined groove  152  on the sensor bottom cover  15 , provides sufficient interface with intermediate tube  2 , in order to achieve the necessary seal against water ingression.  
         [0042]    In addition to the upward or downward adjustment, a side to side or pan adjustment is also provided by an axial rotation created between the outer tube  3  and the sensor top cover  18 . This is achieved by a vertical protrusion  31  inside the outer tube  3  and an interfacing boss on the sensor top cover  18 .  
         [0043]    The electronic adjustment controls  11 , the LEDs  12  and the laterally  20  viewing second PIR motion detector lens  14  are progressively and selectively concealed by adjacent tubes  2 ,  3 , when retracting the inner tube  1  into the intermediate and outer tubes  2 ,  3 .  
         [0044]    As shown in FIG. 3, the inner tube  1  is partially retracted. The LEDs  12 , the full second PIR motion detector lens  14 , and the downwardly viewing first motion detector lens ( 13 ) are visible. As shown in FIG. 4, the inner tube  1  is further retracted. The full second PIR motion detector lens  14  and the first motion detector lens  13  are visible. As shown in FIGS. 5 and 6, the inner tube  1  is further retracted. Only part of the second PIR motion detector lens  14  and the full first motion detector lens  13  are visible. As shown in FIG. 7, the inner tube  1  is completely retracted. The electronic adjustment controls  11 , the LEDs  12  and the second PIR motion detector lens  14  are now concealed. Only the first motion detector lens  13  is visible.  
         [0045]    The covering and mounting structure  10   a  can be mounted on a wall or on a ceiling using appropriate attachment mechanisms. A wall-mounted and a ceiling-mounted covering and mounting structure  10   a  are as shown in FIGS. 8 and 9, respectively.  
         [0046]    The present invention is not restricted to the first embodiment illustrated and described above. Other embodiments, modifications and alterations can be made within the scope of the invention defined in the appended claims.  
         [0047]    A second embodiment is a single body cylindrical covering and mounting structure  10   b,  as shown in FIGS. 10 a,    10   b  and  11 . Since the covering and mounting structure  10   b  is not telescopic, an exterior covering structure  4  is employed to selectively mask the product features carried thereon. It is important to note that the shape of the exterior covering structure  4  must match and fit the shape of the mounting structure. Again, the second preferred embodiment can be disposed in a pendant or standing post arrangement. In the case of pendant arrangement, it is advantageous to include a downwardly viewing first motion detector lens  13  and a laterally viewing second PIR motion detector lens  14  for motion detection, according to the teaching of the invention. In the case of standing post arrangement, only a laterally viewing second PIR motion detector lens  14  is employed.  
         [0048]    A third preferred embodiment of the invention depicts a telescopic cylindrical covering and mounting structure  10   c  disposed in a standing post arrangement, with electronic adjustment controls  11 , LEDs  12  and second PIR motion detector lens  14 , in a fully extended position, as shown in FIG. 12. It is important to note that only one laterally viewing second PIR motion detector lens  14  is provided on the covering and mounting structure.  
         [0049]    In the three embodiments mentioned above, the covering and mounting structure  10   a,    10   b,    10   c  are all cylindrical in shape. The covering and mounting structure  10  can also be constructed in a non-cylindrical shape. In that situation, a non-circular channel is employed instead of cylindrical tube in the telescopic design.