Abstract:
An electrical system comprises a module ( 3 ), an immovable element ( 2 ) defining a space for receiving the module and an ejecting mechanism assembled between the immovable element and the module. The ejecting mechanism comprises a guiding frame ( 6 ), a groove frame ( 5 ) and a first spring element ( 7 ) for urging the module to withdraw out of the immovable element. The guiding frame comprises a swing element ( 63 ) being rotatable around a pivot pin thereof and a second spring element ( 62 ) attached to the swing element. The swing element defines a guiding pin and a balance line. The groove frame defines a continuous groove for guiding the guiding pin. The second spring clement can prevent the guiding pin from being moved along a direction opposite to a predetermined direction.

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention relates to an electrical system, and particularly to an electrical system having an ejecting mechanism. 
   2. Description of Related Art 
   Conventionally, a disk drive apparatus such as a floppy disk driver, a CD (Compact Disc) driver as an external memory of a computer has an ejecting device for ejecting a disk. The ejecting device has a holder for positioning a floppy disk to a drive position. This holder is pivotally mounted on a base of a floppy disk drive device and can be interlocked with a door disposed to freely close/open a floppy disk insertion port of the drive device. The holder has a clamper. While the door is closed, the holder is held at the first position. In this position, the damper of the holder cooperates with a spindle mounted on the base to clamp the floppy disk. When the door is opened, the holder is pivoted to the second position to separate the damper from the spindle. When the floppy disk is inserted through the insertion hole and is placed on the spindle, and the door is closed, the holder is pivoted to the first position, so that the floppy disk is clamped between the spindle and the damper and is placed in the driven position. However, the loading/ejecting device of the disk drive apparatus is too complicated to manufacture. Hence, a disk drive apparatus with a simple loading/ejecting device is desired. 
   U.S. Pat. No. 5,558,527 disclose another ejecting mechanism equipped on a card connector in which even with the PC card mounted therein, a push button for the withdrawal of the PC card is retained in the same position as it is in a not-mounted state; and the push button is projected only when the PC card is withdrawn. 
   The ejecting mechanism basically includes an operation rod having a push button at an outer end section and spring-urged outwardly, a drive rod for driving a PC card withdrawal plate through a lever, an intermediate member driven under an action of a cam and allowing a connection or disconnection to be made between an outer operation rod and an inner drive rod, and a casing for slidably guiding the operation rod and the drive rod. A substantially heart-like cam groove is formed in the bottom wall of the casing with its projecting end side outward and the recessed side inward. The cam groove is formed as a continuous groove configuration, and comprises a drive section, a latching section, and a curved return section which extends from the latching section. A cam follower pin projected from the operation rod is moved in the cam groove along the given direction together with the movement of the push rod. An inclination section is provided at a transition area from the drive section to the latching section and at a transition area from the return section to the drive section so as to prevent the cam follower pin from being moved in a direction opposite to the given direction. 
   However, the ejecting mechanism disclosed in U.S. Pat. No. 5,558,527 provided in the electrical connector comprises a number of elements cooperated with each other to eject the electrical card, thereby complicating the configuration of the electrical card connector and increasing the difficulty of manufacture. Furthermore, the inclination section is required to be provided in the cam groove, thereby increasing the molded difficulty of the earn groove. 
   Hence, an improved ejecting mechanism is desired to overcome the disadvantage of the prior art. 
   SUMMARY OF THE INVENTION 
   An object of the present invention is to provide an electrical system having an improved ejecting mechanism. 
   To achieve the above object, An electrical system comprises a module, an immovable element defining a space for receiving the module and an ejecting mechanism assembled between the immovable element and the module. The ejecting mechanism comprises a guiding frame, a groove frame and a first spring element for urging the module to withdraw out of the immovable element. The guiding frame comprises a swing element being ratatable around a pivot pin thereof and a second spring element attached to the swing element. The swing element defines a guiding pin and a balance line. The groove frame defines a continuous groove for guiding the guiding pin. The second spring element can prevent the guiding pin from being moved along a direction opposite to a predetermined direction. 
   Other objects, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is an assembled perspective schematic view of an electrical system in accordance with the present invention; 
       FIG. 2  is an exploded perspective view of the electrical system shown in  FIG. 1 ; 
       FIG. 3  is a bottom perspective view of a module of the electrical system shown in  FIG. 2 ; 
       FIG. 4  is a partially fragmentary view of an immovable element of the electrical system shown in  FIG. 2 ; 
       FIG. 5  is an explode view of a guiding frame of the immovable element shown in  FIG. 4 ; and 
       FIGS. 6A-6E  are schematic views showing an operation process of an ejecting mechanism of the electrical system. 
   

   DETAILED DESCRIPTION OF THE INVENTION 
   Referring to  FIGS. 1 and 2 , an electrical system  1  in accordance with the present invention comprises an immovable element  2 , such as a floppy disk drive or a CD driver et al., and a module  3 , such as a floppy disk or a CD, received in a cavity  20  defined in the immovable element  2 . The immovable element  2  is adapted for establishing a signal transmission path between the module  3  and an electrical equipment, such as a mother board of a computer. The immovable element  2  and the module  3  are schematically shown in the FIGS. of the present invention for simplicity. 
   Referring to  FIGS. 1-5 , the electrical system  1  further comprises an ejecting mechanism equipped between the immovable element  2  and the module  3 . The mechanism comprises a guiding frame  6 , a groove frame  5  and a first spring element  7 . In the present embodiment, the groove frame  5  is attached to the module  3  and the guiding frame  6  is attached to the immovable element  2 . It is should be noted that the groove frame  5  can be attached to the immovable element  2  and the guiding frame  6  can be attached to the module  3  in other embodiments. The first spring element  7  is attached to the immovable element  2  for urging the module  3  out of the cavity  20 . 
   Referring to  FIGS. 2 ,  4  and  5 , the guiding frame  6  comprises a plate  61  securely assembled on a corner of the immovable element  2  and a swing element  63  attached on the plate  61 . The plate  61  is formed with a pivot pin  613  perpendicularly extending from the middle portion thereof. The pivot pin  613  is formed with a pair of opposite stoppers  614  at a free end thereof. The swing element  63  comprises a pivot base  630 , a pivot arm  631  extending from the base  630  and a guiding pin  632  formed at a distal of the pivot arm  631 . The pivot base  630  defines a pivot hole  633  passing therethrough and is formed with a pair of spaced projections  634  oppositely projecting into the pivot hole  633 . The swing element  63  is assembled onto the plate  61  with the pivot pin  613  rotatably received in the pivot hole  633 . Simultaneously, the stoppers  614  are located above the projections  634  to prevent the swing element  63  from disengaging from the plate  61 . 
   The plate  61  is formed with a protrusion  612  spaced from the pivot pin  613 . A pair of slits  611  aligned with each other, are defined in the protrusion  612 . The guiding frame  6  further comprises a second spring element, such as a pair of resilient pieces  62  stamped from metallic plate. Each resilient piece  62  has a pair of distal ends  621 ,  623  thereof and an a curved and resilient interim section  622  between the distal ends  621  and  622 . Each resilient piece  62  is assembled to the plate  61  with one distal end  621  retained in corresponding slit  611  and the other distal end  623  attached to one of a pair of extensions  635 , which is formed at opposite ends of the base  630  of the swing elements  63  As best shown in  FIG. 4 , in a normal state, the swing element  63  is located in a balance position and the guiding pin  632  defines a balance line l together with pivot pin  613  It should be noted that the spring pieces  62  will drive the swing element  63  to resume the balance position due to inherent characteristic of the spring pieces  62  when the swing element  63  offsets from the balance position. 
   Referring to  FIGS. 2 and 3 , the groove frame  5  comprises an elongated beam  51  securely attached to one side of the module  3 , a groove plate  52  having a rear edge  520  and a continuous groove  53  defined in the groove plate  52  and shaped as            M         . In conjunction with  FIG. 6A , the continuous groove  53  comprises a first drive section  53   a  which curvedly extends away from the rear edge  520  of the groove plate  52  and the balance line l, a first return section  53   b  which extends from the first drive section  53   a  toward the rear edge  520  and the balance line l, a second drive section  53   c  which extends from the first return section  53   b  toward the balance line l and away from the rear edge  520 , and a second return section  53   d  which curvedly extends from the second drive section  53   c  toward the rear edge  520  of the groove plate  52 . The first drive section  53   a  defines an entry A at the rear edge  520  and the second return section  53   d  defines an exit E spaced from the entry A at the rear edge  520 . The groove  53  further defines a latching section C located between the first return section  53   a  and the second drive section  53   c.  
   Referring to  FIGS. 6A-6E , the following is a detailed explanation about the operation of the module  3  and the immovable element  2 . 
   As best shown in  FIG. 6A , before the module  3  is inserted into the immovable element  2 , the guiding pin  632  of the swing element  63  is normally situated at the entry A of the groove  53 . On the other hand, in this state the swing element  63  is located in the balance position. The first drive section  53   a , the first return section  53   b  and the second drive section  53   c  are located at one side of the balance line l of the swing element  63 . 
   As best shown in  FIG. 6B , when the module  3  in the state shown in  FIG. 6A  is slightly pushed in order to be inserted into the immovable element  2 , the guiding pin  632  of the swing element  63  is guided along the first drive section  53   a  to a junction B, which is located between the first drive section  53   a  and the first return section  53   b . In this state, the first spring element  7  is deformed along an inserting direction of the module  3  by a pushing force of the module  3 . Simultaneously, the swing element  63  is rotated round the pivot pin  613  and offsets from the balance position with the spring pieces  632  deformed. 
   As best shown in  FIG. 6C , when the push force of the module  3  is released in the state show shown in  FIG. 6B , a composition of resilient forces of the first spring element  7  and the second spring element  62  urge the guiding pin  632  to move along the first return section  53   b  until the guiding pin arrives at the latching section C. The module  3  is thus completely inserted into the immovable element. It should be noted that the guiding pin  632  can only be guided along the first return second  53   b  and not return along the first drive section  53   a  due to driving of the resilient force of the second spring element  62 . 
   As best shown in  FIG. 6D , when the module  3  in the state shown in  FIG. 6C  is slightly pushed in order to withdraw out of the immovable element  2 , the guiding pin  632  of the swing element  63  is guided along the second drive  53   c  to a junction D, which is located between the second drive section  53   c  and the second return section  53   d . It should be noted that the guiding pin  632  can only be guided along the second drive section  53   c  and not return, along the first return, section  53   b  due to driving of resilient force of the second spring element  62 . 
   As best shown in  FIG. 6E , when the push force to the module  3  in the state shown in  FIG. 6D  is released, the guiding pin  632  is driven by a composition of resilient force of the first spring element  7  and the second spring element  62  to move along the second return section  53   d  until out of the exit E, whereby the module  2  withdraws out of the immovable element  3 . As described above, the second spring element  62  can prevent the guiding pin  632  from moving along a direction opposite to a predetermined direction of the present invention. 
   It is to be understood, however, that even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.