Abstract:
An improved lightbulb ceiling fixture having a canister transversely affixed to a location of a canister frame, comprising two pairs of slidable bar hangers retained on respective opposite sides of the canister frame by retaining mechanisms located on each side of the frame. Each pair of slidable bar hangers comprises an inner sliding bar hanger slidably inserted into an outer sliding bar hanger so that the overall length of the bar hanger can be readily adjusted. A bar hanger stop means such as a wing screw with an interior ratchet mechanism enables the exact overall length of the two bar hangers to be fixed at any desired joint lengthwise distance. A rotatable press fit mounting bracket with rotatable adjustment means is rotatably affixed to one exterior end of one of the sliding bar hangers, thus. The improvement facilitate speed of installation and safety for the worker installing the fixture.

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention is related to an apparatus by which a ceiling fixture is mounted and attached to beams and joists in a ceiling so that the ceiling fixture is attached in a manner which enables the lightbulb retained within the ceiling fixture to illuminate the room in which the ceiling fixture is attached. 
   2. Description of the Prior Art 
   In general, lightbulb ceiling fixtures are known in the prior art. A conventional ceiling fixture comprises a lightbulb canister transversely affixed to a rectangular canister frame, wherein a pair of flat bar hangers having a fixed length are permanently affixed to the respective opposite sides of the canister frame. One disadvantage of prior art bar hangers is that they have a fixed length which must be cut to size to accommodate given distances between ceiling beams into which the bar hangers are mounted. In addition, the mounting brackets are conventionally fixed and this increases the difficulty in attaching the ceiling fixture to the ceiling beams. Typically, a workman is standing on a tall ladder and must balance himself while trying to accurately hang the ceiling fixture. 
   A significant problem in the prior art is that is that a workman must balance himself on a tall ladder while holding the recessed ceiling fixture in one hand and trying to nail the mounting brackets to a wall with his other hand holding a hammer. This is both a time consuming process and is also hazardous as the workman can easily fall off the ladder and injure himself. 
   There is a significant need for an improved apparatus to more safely and efficiently attach a ceiling fixture to the support beams in a ceiling. 
   SUMMARY OF THE INVENTION 
   The present invention is an improvement to a lightbulb ceiling fixture having a canister transversely affixed to a location of a canister frame, wherein the improvement comprises two pairs of slidable bar hangers retained on the respective opposite sides of the canister frame by retaining mechanisms located on each side of the frame. Each pair of slidable bar hangers comprises an inner sliding bar hanger being slidably inserted into an outer sliding bar hanger so that the overall length of the bar hanger can be readily adjusted. A bar hanger stop means such as a wing screw with an interior ratchet mechanism enables the exact overall length of the two bar hangers to be fixed at any desired joint lengthwise distance. A rotatable press fit mounting bracket with rotatable adjustment means is rotatably affixed to an exterior end of each respective sliding bar hanger. This enables a workman to hammer one or more nails through the mounting bracket and into a beam while the entire assembly hangs downwardly and thereafter rotate the assembly into the final position for completing the mounting operation. 
   It has been discovered, according to the present invention, that if two pairs of slidable bar hangers are incorporated into the opposite sides of the canister frame, a combined length of each pair of the slidable bar hangers is variable to conveniently fit various distances between ceiling beams in order to install the lightbulb ceiling fixture into the wood frame of the ceiling structure. 
   It has also been discovered, according to the present invention, that if a stop means such as a wing screw with an internal ratchet mechanism facing the slidable bar hangers is utilized, the desired length of the two slidable bar hangers can be quickly achieved and thereafter the excess length of bar hanger can be cut off, thereby leaving a joint bar hanger length which matches the distance between two beams to which the ceiling fixture will be attached. 
   It has further been discovered, according to the present invention, that if a rotatable mounting bracket having rotatable stop orientation means is respectively affixed at one exterior end of each of the sliding bar hangers, then a workman can hammer a nail into a beam while the entire bar hanger and ceiling fixture is held by the workman and thereafter the assembly can be rotated into position so that a nail can be hammered into the opposite beam to thereby more easily install the bar hangers and the ceiling fixture. 
   It has additionally been discovered, according to the present invention, that if an inner sliding bar hanger of the pair of slidable bar hangers has an improved round lengthwise section along its longitudinal direction, the pair of slidable bar hangers will have improved mechanical strength. 
   It has further been discovered, according to the present invention, that if a plurality of score lines are formed into the surfaces of the inner and outer sliding bar hangers transverse to their longitudinal direction, the inner and outer sliding bar hangers can be more easily cut off or broken off at the location of a score line position so that the length of each inner and outer sliding bar hanger can be easily adjusted. 
   It is therefore a object of the present invention to provide two pairs of slidable bar hangers which are incorporated into the opposite sides of the canister rectangular frame, so that a combined length of each pair of the slidable bar hangers is variable to conveniently fit various distances between ceiling beams in order to install the lightbulb ceiling fixture into the wood frame of the ceiling structure. 
   It is also an object of the present invention to provide a stop means such as a wing screw with an internal ratchet mechanism facing the slidable bar hangers, so that the desired length of the two slidable bar hangers can be quickly achieved and thereafter the excess length of bar hanger can be cut off, thereby leaving a joint bar hanger length which matches the distance between two beams to which the ceiling fixture will be attached. 
   It is a further object of the present invention to provide a rotatable mounting bracket having rotatable stop orientation means respectively affixed to one exterior end of each of the sliding bar hangers, so that a workman can hammer a nail into a beam while the entire bar hanger and ceiling fixture is held by the workman and thereafter the assembly can be rotated into position so that a nail can be hammered into the opposite beam to thereby more easily install the bar hangers and the ceiling fixture. 
   It is an additional object of the present invention to provide an inner sliding bar hanger of the pair of slidable bar hangers with an improved round lengthwise section along its longitudinal direction, so that the pair of slidable bar hangers will have improved mechanical strength. 
   It is a further object of the present invention provide a plurality of score lines which are formed into the surfaces of the inner and outer sliding bar hangers transverse to their longitudinal direction, so that the inner and outer sliding bar hangers can be more easily cut off or broken off at the location of a score line position so that the length of each inner and outer sliding bar hanger can be easily adjusted. 
   Further novel features and other objects of the present invention will become apparent from the following detailed description, discussion and the appended claims, taken in conjunction with the drawings. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     Referring particularly to the drawings for the purpose of illustration only and not limitation, there is illustrated: 
       FIG. 1  is a top plan view of the lightbulb ceiling fixture, comprising a canister transversely affixed into a center location of a canister frame, wherein the present invention of a left and right pair of slidable hanger bars with a rotatable mounting bracket on one exterior end of each of the hanger bars is retained on opposite sides of the rectangular canister frame; 
       FIG. 2  is an interior side elevational view of a slidable hanger bar with a mounting bracket in the non-operative condition fixedly attached at one end; 
       FIG. 3  is an interior side elevational view of a slidable hanger bar with a mounting bracket in the non-operative condition rotatably attached at one end; 
       FIG. 4  is an exterior side elevational view of a slidable hanger bar with a mounting bracket in the non-operative condition fixedly attached at one end; 
       FIG. 5  is an exterior side elevational view of a slidable hanger bar with a mounting bracket in the operative condition after rotation and rotatably attached at one end; 
       FIG. 6  is a side perspective view of the lightbulb ceiling fixture, comprising a canister transversely affixed into a center location of a canister frame, wherein one of a pair of slidable hanger bars and rotatable mounting bracket on the one end of each slidable hanger bar is illustrated with the hanger bars slid so that the distance between the mounting brackets fits the distance between a pair of spaced apart beams to which the mounting brackets will be attached, and the fixed mounting bracket in its operative condition and the rotatable mounting bracket rotated to its operative condition; 
       FIG. 7  is a perspective view of the wing screw with interior ratchet teeth; 
       FIG. 8  is a side perspective view of the lightbulb ceiling fixture, comprising a canister transversely affixed into a center location of a canister frame, wherein one of a pair of slidable hanger bars and rotatable mounting bracket on the one end of each slidable hanger bar is illustrated with the hanger bars slid so that the distance between the mounting brackets fits the distance between a pair of spaced apart beams to which the mounting brackets will be attached, and the fixed mounting bracket in its operative condition and the rotatable mounting bracket rotated to its operative condition, and with the wing screw in place to retain the slidable bar hangers in a fixed position; 
       FIG. 9  is an interior side elevational view of a slidable hanger bar with a mounting bracket in the operative condition fixedly attached at one end; 
       FIG. 10  is an exterior side elevational view of a slidable hanger bar with a mounting bracket in the operative condition fixedly attached at one end; 
       FIG. 11  is an interior side elevational view of the orientation of the mounting bracket on a slidable hanger bar when it is rotated to the position to install the fixture and before it is rotated to its s final position comparable to the views illustrated in  FIGS. 9 and 10 ; and 
       FIG. 12  is a side perspective view of the lightbulb ceiling fixture, comprising a canister transversely affixed into a center location of a canister frame, wherein one of a pair of slidable hanger bars and rotatable mounting bracket on one end of one of the slidable hanger bars is illustrated with the hanger bars slid so that the distance between the mounting brackets fits the distance between a pair of spaced apart beams to which the mounting brackets will be attached, the excess length of hanger bars cut off and the desired length locked in place by a wing screw, and one mounting bracket rotated to its position where the fixture is installed, the other mounting bracket being fixed into its operative condition. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
   Although specific embodiments of the present invention will now be described with reference to the drawings, it should be understood that such embodiments are by way of example only and merely illustrative of but a small number of the many possible specific embodiments which can represent applications of the principles of the present invention. Various changes and modifications obvious to one skilled in the art to which the present invention pertains are deemed to be within the spirit, scope and contemplation of the present invention as further defined in the appended claims. 
   Referring to  FIG. 1 , there is illustrated a top plan view of a ceiling lighting fixture  100  which has a central cannister  108  which includes a lightbulb socket  120  which will receive a lightbulb (not shown). The central cannister  108  is affixed to a canister frame  132  which includes bar hangers supporting mounting brackets by which the canister frame  132  is mounted between beams of a ceiling so that the central canister faces downwardly into the room to thereby permit the lightbulb to shine downward and illuminate a portion of the room in which the ceiling fixture is mounted. 
   In a conventional prior art mounting fixture, the hanger bars are of a given length and must be cut to size so that they fit in the space between adjacent ceiling beams to which the fixture will be attached. Traditionally, a workman must stand on a ladder and place the canister frame into the area between the beams and then hold the heavy ceiling fixture  100  in one hand while balancing on the ladder and then hammering at least one nail through each mounting bracket to nail the mounting bracket to a beam. In addition to being tiring, this is a hazardous job because the workman must balance himself on the ladder and hold the ceiling fixture  120  usually by the canister  108  in one hand and position the mounting brackets so that they are respectively aligned with opposite beams, and them hammer a nail through the mounting bracket and into a beam. 
   The present invention incorporates several innovations which greatly facilitate the installation of the ceiling fixture  100  and make the installation much safer. The first improvement of the present invention is a modification to the design of the hanger bars. The cannister frame  132  of the ceiling fixture  100  has a pair of hanger bar assemblies on either side; a first hanger bar assembly  10  comprising a first hanger bar  12  and a second hanger bar  30  and a second hanger bar assembly  110  also comprising a first hanger bar  112  and a second hanger bar  130 . 
   Referring to  FIGS. 2 and 3 , the two hanger bars  12  and  30  of the first hanger bar assembly  10  are illustrated. First hanger bar  12  has a longitudinal section  14  having an upper longitudinal slotted edge  16  and a lower longitudinal slotted edge  18 . Each longitudinal slotted edge  16  and  18  has a respective gap  20  and  22  between the longitudinal edges  16  and  18  and the longitudinal body  24  of first hanger bar  12 . At least one transverse score line  26  extends through oppositely disposed points of the longitudinal slotted edges  16  and  18 . In  FIGS. 2 , two score lines  26  and  28  are illustrated. Second hanger bar  30  has an upper longitudinal rim  32  and a lower longitudinal rim  34  on opposite longitudinal edges of the longitudinal body  36  of second hanger bar  30 . The second hanger bar also has at least one transverse score line (not shown) extending through oppositely disposed points on the longitudinal rims  32  and  34 . The second hanger bar  30  is inserted into the first hanger bar  12  so that longitudinal rim  32  is inserted into the gap  20  between longitudinal slotted edge  16  and longitudinal body  24 . Similarly, longitudinal rim  34  is inserted into the gap  22  between the longitudinal slotted edge  18  and the longitudinal body  24 . Therefore, hanger bar  30  slides within hanger bar  12 . 
   First hanger bar  12  has a first mounting bracket  40  at one end and second hanger bar  30  has a second mounting bracket  60  at one end. When one hanger bar is slidably inserted into the other hanger bar so that one slides within the other, the two mounting brackets  40  and  60  are at opposite ends of the first hanger bar assembly  10 . 
   First mounting bracket  40  is rotatable. It is shown in its installation position in  FIG. 2 . The workman holds the fixture downwardly and then nails the nail into the stud.  FIG. 4  shows an exterior view of the bar hanger and the rotatable mounting bracket  40 . After installation, the mounting bracket  40  is rotated to the position illustrated in  FIG. 5 . Mounting bracket  60  is fixed and after rotation of mounting bracket  40  after the nail has been hammered into the stud, then the nail of mounting bracket  60  is also hammered into the opposite stud. 
   Referring to  FIG. 6 , there is illustrated a side perspective view of the hanger bar assembly  10  installed onto a side of the ceiling frame  132 . After the rotatable mounting bracket  40  has had its nail hammered into the stud  132 , the ceiling fixture is rotated about the rotatable mounting bracket to be aligned with the stud. The two hanger bars  12  and  30  are slid relative to each other until the distance “D” between mounting bracket  40  and mounting bracket  60  is equal to the distance between the two beams to which each mounting brackets will be respectively attached. One innovation of the present invention is the slidable arrangement of the hanger bars so that the appropriate distance “D” between the mounting brackets  40  and  60  can be set. Once the appropriate distance is set, the excess length of hanger bars  12  and  30  can be cut off so that the total length is the exact length of the distance “D” between the two studs to which the mounting brackets are nailed. In the prior art, the mounting brackets do not have this slidable arrangement and a workman must separate the hanger bars and guess as to the amount of excess hanger bar to be cut off. There is a risk that the workman will cut it too short. With the present invention, the exact distance “D” is determined and the precise amount of excess hanger bar is cut off, preferably through the score lines. 
   A second innovation includes a multiplicity of spaced apart threaded openings  11 ,  13  and  15  in the longitudinal body  24  of first hanger bar  12  and a multiplicity of threaded openings  31 ,  33  and  35  in the longitudinal body  36  of the second hanger bar  30 . Referring to  FIG. 7 , a wing screw  70  is utilized with the threaded opening in the hanger bars. The wing screw  70  has a head  72  with a pair of wings  74  and  76 , and a threaded screw portion  78 , and a circumferential series of ratchet teeth  80  on the interior of the head  72 . The wing screw  70  is threaded into an aligned pair of threaded openings in the two hanger bars  12  and  30  so that the threaded screw portion  80  extends through the aligned opening and the ratchet teeth  80  grips the longitudinal body portion of a hanger bar to firmly affix the two hanger bars  12  and  30  relative to each other so that the distance “D” between the mounting brackets  40  and  60  is fixed. The two hanger bars  12  and  30  affixed relative to each other through the wing screw  70  is illustrated in  FIGS. 6 and 8 . Thereafter, the excess length of hanger bars which extend beyond the respective mounting brackets can be cut off, preferably at the location of a score lines as illustrated in final assembly of  FIG. 12 . 
   The next significant innovation of the present invention is to have one rotatable press fit mounting bracket on each bar hanger.  FIG. 11  shows the rotatable mounting bracket  40  in its operative position where the workman permits the fixture to hang down and hammers the nail  44  into the stud.  FIGS. 9 and 10  show the fixed mounting bracket in its operative condition to enable the nail to be nailed into a stud after the fixture is rotated about rotatable mounting bracket  40  after the nail  44  has been nailed into the stud. 
   In the prior after there was no rotatable mounting bracket but just the fixed orientation. When oriented in this position in a fixed manner as is known in the prior art, the workman must stand on a ladder and hold the ceiling fixture in one hand by holding the lightbulb retaining cannister  110  or the cannister frame  132  and insert the ceiling fixture  100  between two beams and retain it in this way while hammering a nail through a mounting bracket and a beam. This is a dangerous operation because the workman is standing on a tall ladder and can easily lose his balance and/or drop the lighting fixture  100 . 
   The present invention rotatable press fit mounting brackets overcome this problem. Referring to  FIG. 1 , mounting brackets  40  and  60  of first bar assembly  10  are illustrated in their initial position wherein they lie in a plane parallel to first hanger bar  12  and second hanger bar  30 . The innovation of the present invention to the enable one mounting bracket  40  and  140  to be rotatable by a press fit means is illustrated an interior side elevational view of  FIG. 11  which shows the mounting bracket  40  on bar hanger  12  wherein a bracket plate  42  transversely retains a nail  44 . The mounting bracket is retained by a rotatable rivet  46  extending through an arm plate  48  and through longitudinal body  24  of bar hanger  12 . The arm plate  48  is press fitted against the longitudinal body  24  of bar hanger  12  . It is also press fitted at wall  47  against an interior rib  21  of longitudinal body  24  so as to be retained in a press fit. 
   Referring to  FIGS. 9 and 10 , there is illustrated an interior side elevational view of  FIG. 9  and the exterior side elevational view of  FIG. 10  which shows the fixed mounting bracket  60  in is operative condition in the plane of bar hanger  12 . 
   In operation, the workman holds the ceiling fixture  100  so that it hangs down from the ceiling in the manner illustrated in  FIG. 1 . With the entire ceiling fixture  100  hanging down, the workman can hammer a nail  44  of one mounting bracket  40  into a beam and can then hammer the nail from the opposite transversely disposed mounting bracket  90  into the beam. The ceiling fixture  100  is now affixed to the beam and the workman does not have to continue to hold the ceiling fixture. With the ceiling fixture  100  now affixed to a beam at one end of the ceiling fixture  100 , the nailed in mounting brackets can be rotated by 90 degrees to the position comparable to the position illustrated in  FIGS. 9 and 10 . The workman can then fit the length of the hanger bars by sliding one hanger bar relative to another hanger bar in the hanger bar assembly until the distance “D” between opposite lengthwise hanger bars as illustrated in  FIGS. 6 and 8  corresponds to the distance between adjacent beams. The distance can be locked in place by the wing screw  70  with ratchet teeth  80  in the manner previously discussed and the excess length of bar hangers can be cut off in the manner previously discussed. Thereafter, the two opposite fixed mounting brackets  60  and  96  can be affixed to the adjacent beam by hammering a respective nail from each mounting bracket  60  and  96  into the oppositely disposed beam in the ceiling. In this way, the fixture can be safely and easily installed without having to balance and hold the entire ceiling fixture  100  to size it to the distance between beams and hammer the nails of the mounting brackets into adjacent beams in the ceiling. The final assembly for one hanger bar and its mounting brackets is illustrated in  FIG. 12 . It will be appreciated that there are two oppositely disposed hanger bar assemblies which look and operate these same way. It will further be appreciated that the other rotatable mounting bracket  90  has the same components of a bracket plate retaining a nail, and a rotatable press fit rivet extending through a press fit arm plate pressed against an internal rib of a hanger bar, as discussed for mounting bracket assembly  40 . 
   An additional improvement is to position the nail at an angle in the mounting bracket as illustrated in the figures. By having the nail at an angle, it is easier for the workman to hammer the nail into a stud. 
   Of course the present invention is not intended to be restricted to any particular form or arrangement, or any specific embodiment, or any specific use, disclosed herein, since the same may be modified in various particulars or relations without departing from the spirit or scope of the claimed invention hereinabove shown and described of which the apparatus or method shown is intended only for illustration and disclosure of an operative embodiment and not to show all of the various forms or modifications in which this invention might be embodied or operated. 
   Described in detail, the present invention is a ceiling fixture to be affixed to and between two studs having a given distance between the studs, the ceiling fixture having a canister frame, comprising: (a) a first hanger bar assembly attached to a side of the canister frame and a second hanger bar assembly attached at an opposite side of a canister frame, each hanger bar assembly comprising a first elongated hanger bar having a longitudinal body, an upper elongated slotted edge with a gap between the edge and longitudinal body, a lower longitudinal slotted edge with a gap between the edge and the longitudinal body, the body having a multiplicity of spaced apart threaded openings, and a second elongated hanger bar having an elongated body having an upper longitudinal rim and a lower longitudinal rim and a multiplicity of spaced apart threaded openings, the second hanger bar slidably retained within the first hanger bar with a respective longitudinal rim inserted into the gap between an elongated slotted edge and the longitudinal body of the first hanger bar; (b) each hanger bar assembly having a wing screw having a head with ratchet teeth and a transverse threaded screw portion, the transverse threaded screw portion inserted into a respective pair of aligned threaded openings in the first and second elongated hanger bars and threaded therein so that the ratchet teeth engage a hanger bar; (c) each hanger bar assembly having a first mounting bracket rotatably attached by a rotatable rivet at an end of the first elongated hanger bar, the rivet extending through an arm plate having a wall which is press fitted against an interior rib on the longitudinal body of the first elongated hanger bar and having a bracket plate supporting a nail, and a second mounting bracket fixedly attached at an end of the second elongated hanger bar and having a bracket plate supporting a nail; and (d) the two hanger bars of each hanger bar assembly slidably moved relative to each other so that the distance between the two mounting brackets on the hanger bar assembly is equal to the distance between the two studs and the position fixed by the wing nut with an excess length of each hanger bar cut off, and the rotatable mounting bracket positioned so that the nail in the rotatable mounting bracket can be hammered into a stud while the ceiling fixture hangs downwardly from the stud and thereafter the mounting bracket is rotated by ninety degrees so that the nail in the opposite fixed mounting bracket can be nailed to the opposite stud. 
   Described more broadly, the present invention is a ceiling fixture to be affixed to and between two studs having a given distance between the studs, the ceiling fixture having a canister frame, comprising: (a) a first hanger bar assembly attached to a side of the canister frame and a second hanger bar assembly attached at an opposite side of a canister frame, each hanger bar assembly comprising a first elongated hanger bar having a longitudinal body, an upper elongated slotted edge with a gap between the edge and longitudinal body, a lower longitudinal slotted edge with a gap between the edge and the longitudinal body, the body having a multiplicity of spaced apart threaded openings, and a second elongated hanger bar having an elongated body having an upper longitudinal rim and a lower longitudinal rim and a multiplicity of spaced apart threaded openings, the second hanger bar slidably retained within the first hanger bar with a respective longitudinal rim inserted into the gap between an elongated slotted edge and the longitudinal body of the first hanger bar; (b) each hanger bar assembly having a wing screw having a head with ratchet teeth and a transverse threaded screw portion, the transverse threaded screw portion inserted into a respective pair of aligned threaded openings in the first and second elongated hanger bars and threaded therein so that the ratchet teeth engage a hanger bar; (c) each hanger bar assembly having a first mounting bracket rotatably attached by a rotatable rivet at an end of the first elongated hanger bar, the rivet extending through an arm plate having a wall which is press fitted against an interior rib on the longitudinal body of the first elongated hanger bar and having a bracket plate supporting a nail, and a second mounting bracket fixedly attached at an end of the second elongated hanger bar and having a bracket plate supporting a nail; and (d) the two hanger bars of each hanger bar assembly slidably moved relative to each other so that the distance between the two mounting brackets on the hanger bar assembly is equal to the distance between the two studs and the position fixed by the connecting means with an excess length of each hanger bar cut off, and the rotatable mounting bracket positioned so that the nail in the rotatable mounting bracket can be hammered into a stud while the ceiling fixture hangs downwardly from the stud and thereafter the mounting bracket is rotated by ninety degrees so that the nail in the opposite fixed mounting bracket can be nailed to the opposite stud. 
   Described even more broadly, the present invention is a ceiling fixture to be affixed to and between two studs having a given distance between the studs, the ceiling fixture having a canister frame, comprising: (a) a first hanger bar assembly attached to a side of the canister frame and a second hanger bar assembly attached at an opposite side of a canister frame, each hanger bar assembly comprising a first elongated hanger bar having a longitudinal body and elongated receiving means on its lengthwise upper and lower edge, and a second elongated hanger bar having an elongated body slidably retained within the receiving means of first hanger bar; (b) each hanger bar assembly having connecting means to movement of the two hanger bars relative to each other; (c) each hanger bar assembly having a first mounting bracket rotatably attached by a press fit rotatable means at an end of the first elongated hanger bar, and having a bracket plate supporting attaching means, and a second mounting bracket fixedly attached at an end of the second elongated hanger bar and having a bracket plate supporting attaching means, the mounting brackets separated by a desired distance; and (d) the two hanger bars of each hanger bar assembly slidably moved relative to each other so that the distance between the two mounting brackets on the hanger bar assembly is equal to the distance between the two studs and the position fixed by the connecting means with an excess length of each hanger bar cut off, and the rotatable mounting bracket positioned so that the nail in the rotatable mounting bracket can be hammered into a stud while the ceiling fixture hangs downwardly from the stud and thereafter the mounting bracket is rotated by ninety degrees so that the nail in the opposite fixed mounting bracket can be nailed to the opposite stud. 
   Described alternatively more broadly, the present invention is a ceiling fixture to be affixed to and between two studs having a given distance between the studs, the ceiling fixture having a canister frame, comprising: (a) a first hanger bar assembly attached to a side of the canister frame and a second hanger bar assembly attached at an opposite side of a canister frame, each hanger bar assembly comprising a first elongated hanger bar having a longitudinal body and elongated receiving means to slidably receive a second elongated hanger bar having an elongated body slidably retained within the receiving means of first hanger bar; (b) each hanger bar assembly having connecting means to restrain movement of the two hanger bars relative to each other; (c) each hanger bar assembly having a first mounting bracket rotatably attached at an end of the first elongated hanger bar, and having a bracket plate supporting attaching means, and a second mounting bracket fixedly attached at an end of the second elongated hanger bar and having a bracket plate supporting attaching means; and (d) the two hanger bars of each hanger bar assembly slidably moved relative to each other so that the distance between the two mounting brackets on the hanger bar assembly is equal to the distance between the two studs and the position fixed by the connecting means with an excess length of each hanger bar cut off, and the rotatable mounting bracket positioned so that the attaching means in the rotatable mounting bracket can be affixed to a stud while the ceiling fixture hangs downwardly from the stud and thereafter the mounting bracket is rotated by ninety degrees so that the attaching means in the opposite fixed mounting bracket can be affixed to the opposite stud.