Abstract:
A lighting device which comprises a box-shaped body and a light source in the body, with at least one wall that allows passage of a light beam generated by the light source. The box-shaped body includes a pivotable support mounting the light source such that it is rotatable about at least one axis of rotation for adjusting the angle of the light beam generated thereby. The device also has a magnetic attraction member for controlling the axis from the outside the body.

Description:
FIELD OF THE INVENTION 
       [0001]    The present invention relates generally to the field of lighting appliances and particularly to a lighting device, especially but not exclusively of the type intended for flush mounting in floors, in which the light beam is orientable. 
       BACKGROUND ART 
       [0002]    In certain situations it may be necessary for the direction of the light beam produced by a lighting appliance to be adjustable according to need. For such purposes, there are known devices wherein the orientation of the light beam is obtained by rotating the entire lamp body, which is pivotally connected to its base. Since a solution of this type is not always acceptable or feasible, alternative lighting devices have been proposed wherein the assembly of the body is fixed while the light source is installed on a support which allows for it to rotate. However, the rotation of the support to change the orientation of the light beam may pose some problems. 
         [0003]    In fact, adjusting the inclination of the light source involves dismantling the lighting appliance to gain access to its interior in order to take action manually on the lamp base. Dismantling the glass cover protecting the lamp may prove particularly laborious, especially in the case of flush-mounted, watertight lighting appliances of the type often needed for installation in outside environments, e.g. along paths leading to the door of a home, or in interiors with a high degree of humidity, such as kitchens or bathrooms. The watertight feature of the appliance may also be lost due to wear on the sealing gaskets deriving from repeated dismantling, or due to an erroneous re-assembly of said sealing gaskets. 
         [0004]    On the other hand, the provision for a mechanical transmission of the beam-adjusting action accessible from outside the device to avoid the need for said dismantling procedure would not only be functionally and aesthetically unacceptable, but would also be unsuitable for use in watertight flush-mounted appliances because of the consequent risk of infiltration around the area of the operating element of transmission. 
         [0005]    The object of the present invention is to provide a lighting device with a fixed lamp body installation in which the direction of the light beam can be adjusted without the need to dismantle the device. 
         [0006]    Another object of the present invention is to provide a lighting device of the above-mentioned type wherein the light beam can be adjusted using a structurally and functionally straightforward solution without affecting the appearance of the device. 
       SUMMARY OF THE INVENTION 
       [0007]    These objects are achieved with the lighting device according to the present invention, which comprises a box-shaped body and a light source housed in the body, said body having at least a wall through which a light beam generated by the light source is emitted. The body contains a pivotable lamp base whereon the light source is mounted so that it is capable of rotating around at least one axis of rotation in order to adjust the orientation of the light beam projected therefrom. Means exerting an attractive magnetic force are provided to enable the base to be rotated around the axis of rotation from the outside of the box, in particular operated through a cursor sliding along guide means fixedly attached to the body, and capable of displacement in a direction parallel to the light emission wall and at right angles to the axis of rotation of the lamp base. The cursor is connected to the base so that the displacement of the cursor and the rotation of the base are cinematically linked and means are provided for reversibly locking the position of the cursor which comprises an element responsive to attractive magnetic forces such that movable control means exerting an attractive magnetic force from the outside of the box-shaped body can be used to command the release of the locking means and the displacement of the cursor with a consequent rotation of the light source. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0008]    The characteristics and advantages of the lighting device according to the present invention will be apparent from the following description of an embodiment thereof, provided as a non-limiting example with reference to the attached drawings, wherein: 
           [0009]      FIG. 1  shows a perspective view of the internal structure of a lighting device according to the present invention; 
           [0010]      FIG. 2  shows a plan view of the lighting device according to the present invention; 
           [0011]      FIG. 3  shows a cross-sectional view of the lighting device taken along lines III-III in  FIG. 2 ; 
           [0012]      FIGS. 4   a  and  4   b  show cross-sections of the lighting device taken along lines IV-IV of  FIG. 2 , in two different stages of the operating procedure. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0013]    With reference to the aforementioned figures, the embodiment described below concerns a flush-mounted watertight floor lighting device—an installation that represents a preferred, but not exclusive application of the invention. The numeral  1  is used to indicate a box-shaped body of substantially parallelepiped shape, intended for flush mounting in a corresponding seat (not shown) formed in a floor or, more in general, in a substantially horizontal floor surface. The body  1  is open on its upper side, i.e. on the side lying flush with the floor after the appliance has been installed. A protective glass cover  2  is arranged on the open side, serving as a lid that closes the body  1 . The watertightness of the closure is assured by means of sealing gaskets (not shown) attached in line with the contact surfaces between the body  1  and the glass cover  2 . 
         [0014]    On the bottom la of the body  1 , i.e. on the side opposite the one formed by the glass cover  2 , there stands a fixed supporting element  3  consisting of an elongated base  4  attached to bottom  1   a,  with two arms  5 ,  6 , one at each end, projecting at right angles therefrom. The arms  5 ,  6  define the extremities of an axis Y, parallel to the bottom  1   a  and a pivotable support  7  is pivotally connected to said arms by means of bolted connection means  8  for rotation around axis Y. 
         [0015]    In particular, the pivotable support  7  comprises a base  9  of similar shape to that of the base  4  of the fixed supporting element  3 , and arms  10 ,  11  at each end bent back at right angles to said base  9 . The connection means  8  hold the latter arms  10 ,  11  up against the respective inner surfaces of the arms  5 ,  6  of the fixed supporting element  3 . A light source (not shown) is installed on the base  9  with the aid of electrically-powered supporting means of conventional type (not shown). 
         [0016]    One of the two arms of the pivotable support  7 , i.e. the one indicated by the numeral  11  in the example, extends further beyond the corresponding bolted connection than the other arm, thereby defining the operating end  11   a,  to which there is fixed a cylindrical stud  12  on an axis parallel to the axis of rotation Y. The stud  12  has two sections,  12   a  and  12   b,  projecting symmetrically from either side of the end  11   a.    
         [0017]    A guide  13  is attached to a side wall  1   b  of the body  1 , so that it lies parallel and adjacent to the arms  6  and  11 ; in the embodiment illustrated, the guide is in the form of square-shaped element with a first wing  13   a  fixed to the side wall  1   b  and a second wing  13   b  extending parallel and proximal to the glass cover  2 , projecting over the operating end  11   a  of the arm  11 . 
         [0018]    A slot  14  is cut in the second wing  13   b  in the direction perpendicular to the axis Y and exactly in line with the operating end  11   a  of the arm  11 . The upper face of the second wing  13   b,  i.e. the surface facing towards the glass cover  2 , has a toothed surface  15  formed by a plurality of adjacent teeth that develop lengthwise in a direction perpendicular to the slot  14 . 
         [0019]    A cursor  16  engages slidingly with the slot  14  and comprises a plate  17  resting on the upper face of the wing  13   b  and two forks  18  and  19  projecting downwards from the plate  17  to fit into the slot  14 . Each fork  18 ( 19 ) defines a slit  24  in which respectively engage slidingly one of the two sections  12   a,    12   b  of the stud  12  provided on the operating end  11   a  of the arm  11 . To this purpose, the two forks are spaced from one another so as to house end  11   a  in the space defined therebetween. 
         [0020]    A locking tooth  20  (shown in  FIGS. 4   a  and  4   b ) projects from the underside of the plate  17  so as to engage between two adjacent teeth in the toothed surface  15  to prevent the cursor  16  from sliding with respect to the guide  13 . A sheet plate  21  of ferromagnetic material is firmly attached to the upper surface of the plate  17 . 
         [0021]    With particular reference to  FIGS. 4   a  and  4   b,  the appliance according to the present invention operates as follows. The orientation of the light beam in a given direction is achieved by taking action from the outside of the device on the movable support  7 , on which the light source is installed. 
         [0022]      FIG. 4   a  shows any stable configuration of the device, with a given orientation of the light beam stably maintained by the engagement of the locking tooth  20  between two adjacent teeth on the toothed surface  15 . Starting from said configuration, in order to change the inclination of the pivotable support  7 , it is necessary to disengage the locking tooth  20  from the toothed surface  15 . To do so, action is taken with a magnet  22  placed on the outer surface of the glass cover  2 , in a position corresponding to the cursor  16 , with an attractive magnetic force sufficient to lift the cursor  16 , thereby disengaging the locking tooth  20  from the toothed surface  15 . 
         [0023]    Then any displacement of the magnet  22  over the glass cover  2  in a direction parallel to the slot  14  gives rise to a simultaneous displacement of the cursor  16 . The two sections  12   a,    12   b  of the stud  12  being respectively engaged with the forks  18  and  19 , any displacement of the forks induces a rotation of the pivotable support  7  (to which the stud  12  is attached) around the axis Y, with a consequent change in the inclination of the light beam. The length of the slot  14  determines the end angular positions that can be occupied by the pivotable support  7 . 
         [0024]    When the inclination of the light beam coincides with the user&#39;s requirements, the magnet  22  is lifted away from the glass cover  2 , preferably in a movement perpendicular to the surface of the glass to prevent any accidental further displacement from modifying the set light beam orientation. When the magnet  22  is withdrawn, the action of its attractive magnetic force on the cursor  16  is lost and, due to the effect of gravity, the latter drops back onto the wing  13   b  of the guide  13 , restoring the stability of its new position when the locking tooth  20  engages between two adjacent teeth on the toothed surface  15 . 
         [0025]    Any further modification of the angle of the light beam can be achieved by placing the magnet  22  back on the glass cover  2  and repeating the previously-described procedure. 
         [0026]    It is clear from the above description that the device according to the invention enables the orientation of the light beam to be adjusted without the need to undertake any dismantling operation and without using any mechanical transmission system connecting the inside with the outside of the device. The reliability of the watertightness, in the case of a watertight device, is consequently assured, together with a solution that is functionally straightforward and safe, and that does not affect the structural appearance of the device. 
         [0027]    The exploitation of a force of magnetic attraction between an outside control element and an inside element (a magnet and a ferromagnetic element, or two magnets of opposite polarity) to induce a rotation of the pivotable support for the light source may also rely on different structural solutions from the one described in the embodiment illustrated herein, though the latter has the advantage of being simple to manufacture and reliable in operation. 
         [0028]    The previously-described embodiment shall not be deemed to restrict the potential applications of the invention. In particular, lighting appliances installed on vertical walls or ceilings, be they for flush mounting or otherwise, may also benefit from such a solution using an attractive magnetic force to modify the orientation of a pivotable support for a light source. The support&#39;s axis of rotation may also be in any arrangement other than the horizontal. Where necessary, elastic means may be used to exert a return action in lieu of the effect of gravity in floor lighting installations. Even more in general, the pivotable support may also be capable of rotation around two or three axes, always under the control of operating means exploiting an attractive magnetic force. 
         [0029]    Still in the context of structural solutions that can be traced back to the preferred embodiment, the engagement between the stud  12  and the arm  11  may include different structural expedients, e.g. instead of the forks  18  and  19 , an arm projecting downwards from the plate  17 , with a stud fixed to the free end of said arm suitable for engaging slidingly in a slit obtained on the operating end  11   a  of the arm  11 . Different structural solutions may also be adopted for the configuration of the plate  17  and of the corresponding supporting and locking system. 
         [0030]    Various modifications and alterations to the invention may be appreciated based on a review of the disclosure. These changes and additions are intended to be within the scope and the spirit of the invention as defined by the following claims.