Abstract:
A bracket for receiving an external electrical device is provided in this invention. The bracket comprises a frame, a door rotatably positioned on the frame, and a metal shielding fixed on the frame. The door comprises a shaft traversing therethrough. The shaft has a driving portion formed thereon. The metal shielding comprises a spring portion registered with the driving portion of the door. The driving portion of the door deforms the spring portion of the metal shielding when the door is rotated due to insertion of the external electric device into the bracket.

Description:
CROSS REFERENCE APPLICATION 
     This is a continuation in part application of a U.S.A. application No. Ser. 09/576,739 filed on May. 23, 2000 which is pending now. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a bracket for receiving an external device such as a transceiver module or the like and, more particularly, to a bracket having a recoverable door which will be opened from an original closed position when the external device is inserted into the bracket, and which will recover to the original closed position when the external device is withdrawn from the bracket. 
     2. The Prior Art 
     Laser diodes are basic components used in an optical transceiver for converting electrical signals into decoded photo signals. Normally, the photo signal emitted from the laser diode is harmful to human eyes. U.S. Pat. No. 5, 879,173, disclosed a door hinged to a mounting panel by means of a shaft thereof and a coil spring is mounted on each shaft end of the door for automatically returning the door to its closed position after the door is opened. Normally, the assembling of the coil spring to the door is cumbersome. Moreover, the coil spring is apt to be detached from the shaft end and cause malfunction after several times of operation. It is requisite to provide a new structure, which can solve the problem as encountered in the conventional bracket using coil springs. The inventor of the present invention has filed a patent application Ser. No. 09/576,739 which provides a new bracket having self-resilient parts for returning the door back to its closed position without the use of coil springs. However, the self-resilient parts are difficult to manufacture therefore a simplifier structure having the same function is required. 
     SUMMARY OF THE INVENTION 
     The primary purpose of the present invention is to provide a new bracket which utilizes a self-resilient structure to return a door thereof from an opened position to an original closed position after an inserted electrical device is pulled off from the bracket. 
     According to one aspect of the present invention there is provided a bracket for receiving an external electrical device. The bracket comprises a frame, a door rotatably positioned on the frame, and a metal shielding fixed on the frame. The door comprises a shaft traversing therethrough. The shaft has a driving portion formed thereon. The metal shielding comprises a spring portion registered with the driving portion of the door. The driving portion of the door deforms the spring portion of the metal shielding when the door is rotated due to insertion of the external electric device into the bracket. 
    
    
     BRIEF DESCRIPTION OF THE DRAWING 
     FIG. 1 is an exploded view of a bracket in accordance with the present invention having a frame, a metal door, a metal shielding and a ground plate; 
     FIG. 2 is a view similar to FIG. 1, except that the metal door has been configured to the frame; 
     FIG. 3 is a view similar to FIG. 2, except that the metal shielding has been configured to the frame; 
     FIG. 4 is a fully assembled view of FIG. 1; and 
     FIG. 5 is a view similar to FIG. 4, except that the metal door has been opened after insertion of an external electric device. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring to FIG. 1, a bracket in accordance with the present invention comprises a frame  1 , a metal door  2  ready to be received in the frame  1 , a metal shielding  3  ready to be engaged with the frame  1 . The frame may be made of metal or dielectric material. In this embodiment, the frame  1  is preferably made of metal via a die casting procedure. 
     The frame  1  has a rectangular closure  17  and two side walls  11  extending in parallel from opposite sides of the rectangular closure  17 . An entrance  14  is defined in the rectangular closure  17  for passing an external transceiver module into the frame  1 . A lower beam  10  and an upper beam  100  are connected between the side walls  11  for maintaining parallel relation between the side walls  11 . Each side wall  11  has an upper surface  120  and a lower surface  111  and a guiding rail  113  formed on an inner surface thereof for guiding and positioning an external transceiver module (not shown) in the frame  1 . A substantially U-shaped positioning groove  12  is defined in each side wall  11  and located between two side flanges  121  and a bottom flange  122 . A slope face  13  is formed on an edge portion of the upper surface  120  of the side wall  11 . A first recess  51 , a second recess  52 , a third recess  53 , and a fourth recess  54  are defined in the side wall  11 , wherein the second recess  52  is under the slope face  13 . Two posts  18  extend downward from the lower surface  111  of each side wall  11  for positioning the frame  1  on a printed circuit board (not shown). A pair of positioning recesses  15 , shaped like semicircle, actually cutouts in this embodiment, are defined in the side walls  11  and opposite to each other. A protrusion  19  projects from one end of each upper surface  120  of the side wall  11 . 
     The metal door  2  has a plate portion  25  and a shaft  21  formed at the top thereof and extending beyond opposite sides of the plate portion  25  for a small distance. The shaft  21  terminates at each distal end a stop  22  and comprises a protrusive portion  24  extending laterally from a middle position thereof. An indication mark or groove  23  is formed on the stop  22  for showing whether the door  2  is opened or not when the door  2  is configured to the frame  1 . In this embodiment, the protrusive portion  24  are two spaced-away cambered tabs  26  which are shown in phantom lines because they are blocked by the plate portion  25  in this view. However, the number of the cambered tabs is not limited to two; one or more than two still works. The length of the shaft  21  is so predetermined that when the shaft  21  is positioned on the positioning recesses  15 , the stops  22  thereof just extend beyond the side walls  11  allowing the shaft  21  to rotate with respect to the side walls  11  while retain in contact with peripheries of the positioning recesses  15 . 
     The metal shielding  3  comprises an upper plate  3 A and two side plates  30  extending downward from two sides of the upper plate  3 A. Each side plate  30  has a first tab  36 , a second tab  37 , a third tab  38 , and a fourth tab  39  respectively corresponding, in physical location, to the first recess  51 , the second recess  52 , the third recess  53 , and the fourth recess  54  of the side wall  11  of the frame  1 . The first and the fourth tabs  36 ,  39  extend upward, while the second and the third tabs  37 ,  38  extend downward. The third tab  38  has a pair of barbs  381  formed at a lower portion thereof functioning as a board lock for engaging with a printed circuit board (not shown). 
     The upper plate  3 A has a pair of first flanges  31  extending from two ends of a rear edge thereof. A second flange  32  extends laterally from the first flange  31 . A third flange  33  extends rearward from the upper plate  3 A and has a board lock  331  extending rearward. The third flange  33  is located between the first flanges  31 . A spring arm  34  formed at a front edge of the upper plate  3 A is shaped downward along a lengthwise direction thereof yet terminated as a curved end  35  extending upward. 
     A pair of ground plates  4  each has a curved side wall  41 , and a plurality of resilient latches  42  and grounding tabs  44  alternately extend from the curved side wall  41 . Specifically, the resilient latch  42  and the grounding tab  44  extend in different directions. 
     In assembling, as referring to FIG. 2, the metal door  2  is firstly configured to the frame  1  by locating the shaft  21  in the positioning recesses  15 , with the stops  22  thereof respectively extending beyond the side walls  11  while the plate portion  25  of the metal door  2  is positioned between the side walls  11  and blocks the entrance  14  of the closure  17 . With this configuration, the metal door  2  can be constantly rotated with respect to the frame  1  without lateral movement due to limitation of the two stops  22 . 
     Also referring to FIG. 3, the metal shielding  3  is configured to the frame  1  by positioning the upper plate  3 A on the closure  17  and the upper beam  100 , and positioning the side plates  30  in the U-shaped positioning groove  12 , wherein edges of each side plate  30  is in contact with the side flanges  121  and the bottom flange  122 . The first flange  31  and the second flange  32  of the upper plate  3 A is in contact with the protrusion  19 . When the metal shielding  3  is configured to the frame  1 , the second tab  37  slides over the slope face  13  and is received in the second recess  52 , meanwhile the first tab  36 , the third tab  38 , and the fourth tab  39  are respectively received in the first recess  51 , the third recess  53 , and the fourth recess  54  for fixing the metal shielding  3  to the frame  1 . The curved end  35  of the spring arm  34  is registered with the protrusive portion  24  of the metal door  2 . For example, the curved end  35  of the spring arm  34  may proximate to or contact with the protrusive portion  24  of the metal door  2 . 
     Also referring to FIG.4, the ground plates  4  are configured to the closure  17  by engaging the curved side wall  41  and the resilient latches  42  with upper and lower beams (not labeled) of the closure  17  while leaving the grounding tabs  44  extending out of the closure  17  for making electrical contact with a metal enclose, such as a server enclose (not shown) which accommodates the bracket therein when the bracket is used with the metal enclose. 
     Also referring to FIG. 5, when an external electric device such as a transceiver module (not shown) is inserted into the bracket from the metal door  2 , it will drive the plate portion  25  together with the shaft  21  to rotate for 90 degrees thus driving the metal door from a normally closed position to an opened position, meanwhile the spring arm  34  will be deformed by the protrusive portion  24  of the shaft  21  thereby storing a tension for recovering the metal door  2  back to its closed position upon withdrawal of the external transceiver module. The indication mark  23  of the stop  22  indicates whether the door  2  is opened or not from a side view. 
     While the present invention has been described with reference to a specific embodiment, the description is illustrative of the invention and is not to be construed as limiting the invention. Therefore, those can make various modifications to the present invention to the preferred embodiment skilled in the art without departing from the true spirit ad scope of the invention as defined by the appended claims,