Abstract:
A cover assembly can open a first cover and a second cover via a first elastic element, and close the first cover and the second cover via a second elastic element. The cover assembly can conveniently cover the first cover and the second cover on a base.

Description:
BACKGROUND 
       [0001]    1. Technical Field 
         [0002]    The present disclosure relates to a cover assembly. 
         [0003]    2. Description of Related Art 
         [0004]    To gain access to the internal hardware of an electronic device, to repair or replace parts for example, usually requires the use of a tool or tools to remove and then replace several fasteners, which is inconvenient. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0005]      FIG. 1  is an exploded, isometric view of an exemplary embodiment of a cover assembly, the cover assembly including a base, a first cover, and a second cover. 
           [0006]      FIG. 2  is an isometric, inverted view of the second cover of  FIG. 1 . 
           [0007]      FIG. 3  is a partially assembled, isometric view of  FIG. 1 , wherein the first cover is assembled to the base. 
           [0008]      FIG. 4  is an assembled, isometric view of the cover assembly  FIG. 1 , but an inverted view. 
           [0009]      FIG. 5  is are similar to  FIG. 4 , but showing a using state. 
       
    
    
     DETAILED DESCRIPTION 
       [0010]    Referring to  FIGS. 1 ,  2 , and  4 , an exemplary cover assembly  1  includes a base  10 , a first cover  20 , a second cover  30  engaged with the first cover  20 , a shaft  40  used to pivotably connect the first cover  20  to the base  10 , a torsion spring  50 , and two extension springs  60  connected between the first cover  20  and the second cover  30 . 
         [0011]    A depressed portion  11  is defined in a top of the base  10 , to receive the second cover  30 . An opening  12  is defined in a bottom of the depressed portion  11 , corresponding to the first cover  20 . Two first blocks  13  extend from two opposite sidewalls bounding the opening  12 . A bottom of each first block  13  forms a stopping surface  15 . A top of each first block  13  forms an inclined sliding surface. A fixing portion  14  extends from an end of each of the two opposite sidewalls bounding the opening  12 . Each of the fixing portions  14  defines a through hole  142 . 
         [0012]    A notch  21  is defined in a first side of the first cover  20 . Two connection portions  22  are formed on the first side of the first cover  20  at opposite ends of the notch  21 . A through hole  221  is axially defined in each connection portion  22 . Two notches  23  are defined in a second side opposite to the first side of the first cover  20 . Two substantially L-shaped hooks  24  extend down from the first cover  20  at ends bounding the corresponding notches  23 . 
         [0013]    The second cover  30  includes a board  31 , two parallel first walls  32  perpendicularly extending down from opposite ends of a bottom of the board  31 , and a second wall  33  perpendicularly extending down from a side of the bottom of the board  31 . The second wall  33  is perpendicularly connected between corresponding ends of the two first walls  32 . A recess  39  is defined in a top portion of the board  31  to provide convenient access to operate the second cover  30 . A rib  34  is formed on an inside surface of each first wall  32  facing the other first wall  32 . A sliding slot  35  is formed between each rib  34  and the bottom of the board  31  to receive opposite sides of the first cover  20 . Two second blocks  36  extend from an outside surface opposite to the inside surface of each first wall  32 , corresponding to the first blocks  13 . A bottom of each second block  36  forms an inclined sliding surface. A top of each second block  36  forms a stopping surface  38 . Two protrusions  37  extend down from a bottom of the second wall  33 . A hole  372  is defined in each protrusion  37 . 
         [0014]    Referring to  FIGS. 3 ,  4 , and  5 , in assembly, the first cover  20  is pivotably connected to the base  10  via the shaft  40  passing through the through hole  221  of one connection portion  22 , the torsion spring  50 , and the through hole  221  of the other connection portion  22 . The torsion spring  50  is received in the notch  21 . A first end of the torsion spring  50  abuts against the bottom of the first cover  20 . A second end of the torsion spring  50  abuts against the bottom of the base  10 . The first cover  20  is pivoted up and out of the base  10 . The second cover  30  is attached to the first cover  20 , with opposite ends of the first cover  20  sliding into the corresponding sliding slots  35  of the second cover  30 . Therefore, the second cover  30  covers the first cover  20 . Opposite ends of each extension spring  60  are engaged with a corresponding hook  24  and a corresponding hole  372 . 
         [0015]    When the first cover  20  and the second cover  30  need to be closed, the first cover  20  and the second cover  30  are rotated towards the opening  12  of the base  10 . The torsion spring  50  is deformed. The second cover  30  is pushed away from the shaft  40  and pressed down. The extension springs  60  are deformed. The second blocks  36  of the second cover  30  touch the corresponding first blocks  13  of the base  10 . The sliding surfaces of the second blocks  36  slide along the sliding surfaces of the corresponding first blocks  13 , until the second blocks  36  are staggered with the corresponding first blocks  13 . The second cover  30  moves back towards the shaft  40  under force of restoration of the extension springs  60 . The stopping surfaces  38  of the second blocks  36  engage with the stopping surfaces  15  of the first blocks  13  under restoration force of the torsion spring  50 . Therefore, the first cover  20  and second cover  30  are received in the depressed portion  11  of the base  10 . 
         [0016]    When the first cover  20  and the second cover  30  are opened from the base  10  via the second cover  30  being operated up on the recess  39 , the extension springs  60  are stretched. The stopping surfaces  38  of the second blocks  36  disengage from the stopping surfaces  15  of the corresponding first blocks  13 . The sliding surfaces of the second blocks  36  slide long the sliding surfaces of the corresponding first blocks  13  under restoration force of the extension springs  60 , and the first and second covers  20  and  30  rotate towards the outside of the base  10  under restoration force of the torsion spring  50 . 
         [0017]    It is to be understood, however, that even though numerous characteristics and advantages of the embodiments have been set forth in the foregoing description, together with details of the structure and function of the embodiments, the disclosure is illustrative only, and changes may be made in details, especially in matters of shape, size, and arrangement of parts within the principles of the embodiments to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.