Disc box structure

A disc box structure including a box body and a cover body pivotally connected with one side of the box body. An annular stepped projection is formed in the box body. The center of the annular projection is disposed with two opposite lifted engaging members. The lower ends of the engaging members are connected with the bottom face of the box body, while the upper ends of the engaging members are disposed with substantially semicircular opposite fitting ribs. An engaging projection is formed on an upper end of a middle section of the outer edge of each fitting rib. The inner edges of the opposite fitting ribs have several inward extending resilient bridge ribs which commonly connect with a pressing member, whereby-the engaging members have better structural strength and are protected from breaking due to shearing force of the disc. When it is desired to take out the disc, a user only needs to depress the pressing member between the engaging members to easily take out the disc.

BACKGROUND OF THE INVENTION 
The present invention relates to a disc box structure in which the engaging 
members for fixing the disc have better structural strength and permit a 
user to easily take out the disc. 
FIG. 1 shows a conventional disc box including a box body 10 and a cover 
body 20 pivotally connected with one side of the box body 10. A U-shaped 
peripheral frame 11 is disposed along the other three sides of the box 
body 10. A middle section of a front face of the peripheral frame 11 is 
formed with an inward recess 111. An inner face of the box body 10 is 
disposed with an annular stepped projection 12. The center of the stepped 
projection 12 is disposed with two opposite lifted engaging members 13. A 
lower end of each engaging member 13 is connected with the bottom face of 
the box body 10. An upper end thereof is disposed with a substantially 
semicircular opposite fitting protuberance 131. A tenon 132 is formed on 
an upper end of a middle section of the arch edge of the fitting 
protuberance 131, which extends in a direction reverse to the engaging 
member 13. An upper section of the engaging member 13 is disposed with a 
perforation 133 corresponding to the tenon 132 for facilitating the 
demolding operation relative to the tenon 132 during injection molding. 
When placing a disc 30 into the disc box, the central circular hole 31 of 
the disc 30 is fitted with outer edges of the fitting protuberances 131 of 
the engaging members 13 with the tenons 132 of the engaging members 13 
engaged with the circumference of the circular hole 131 of the disc 30. 
The above disc box has some shortcomings as follows: 
1. The engaging members 13 of the box body 10 are independent members 13 
which have poor structural strength. Therefore, in case the disc box is 
dropped onto the ground (referring to FIG. 2), the engaging members 13 
will suffer a reverse shearing force of the disc 30 which may lead to 
breakage of the engaging members 13 from two sides of the perforations 
133. 
2. When taking the disc 30, the fitting protuberances 131 of the two 
engaging members 13 must be pressed at the same time so that it is 
inconvenient to take out the disc. In addition, in the case that only one 
engaging member 13 is pressed (referring to FIG. 3), not only the disc 30 
cannot be taken out, but also the other engaging member 13 may be forcedly 
broken or the disc 30 may be deformed or broken. 
SUMMARY OF THE INVENTION 
It is therefore a primary object of the present invention to provide a disc 
box structure in which the engaging members are connected to a pressing 
member by several resilient bridge ribs so that they have better 
structural strength. Therefore, in case the disc box is dropped onto the 
ground, the engaging members are protected from breaking due to shearing 
force of the disc. 
It is a further object of the present invention to provide the above disc 
box structure in which when taking out the disc, a user only needs to 
press the pressing member between the engaging members for easily taking 
out the disc without breaking the engaging members or deforming or 
breaking the disc.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
Please refer to FIG. 4. The disc box of the present invention includes a 
box body 40 and a cover body 50 pivotally connected with one side of the 
box body 40. A U-shaped peripheral frame 41 is disposed along the other 
three sides of the box body 40. A middle section of a front face of the 
peripheral frame 41 is formed with an inward recess 411. In a state that 
the cover body 50 is mated with the box body 40, a user can extend his/her 
finger into the recess 411 to easily open the cover body 50. An annular 
stepped projection 42 is formed in the box body 40. The inner diameter of 
the large step of the annular projection 42 is slightly larger than the 
diameter of the disc 30. The outer circumference of the annular projection 
42 is formed with several arch recesses 421 at equal intervals. The center 
of the annular projection 42 is disposed with two opposite lifted engaging 
members 43 which gradually expand. The lower ends of the engaging members 
43 are connected with the bottom face of the box body 40, while the upper 
ends thereof are disposed with substantially semicircular opposite fitting 
ribs 431. An engaging projection 432 is formed on an upper end of a middle 
section of the outer edge of the fitting rib 431, which extends in a 
direction reverse to the engaging member 43. An upper section of the 
engaging member 43 is disposed with a perforation 433 corresponding to the 
engaging projection 432. In addition, the inner edges of the opposite 
fitting ribs 431 have several inward extending resilient bridge ribs 434 
which commonly connect with a pressing member 435. 
Referring to FIG. 5, when placing a disc 30 into the disc box, the central 
circular hole 31 of the disc 30 is fitted with outer edges of the fitting 
ribs 431 of the engaging members 43 of the box body 40 with the engaging 
projections 432 of the engaging members 43 engaged with the circumference 
of the circular hole 131 of the disc 30. 
Referring to FIG. 6, when taking out the disc 30, the pressing member 435 
between the engaging members 43 is depressed, whereby by means of the 
resilient bridge ribs 434, the opposite fitting ribs 431 of the two 
engaging members 43 are driven and moved downward. At this time, the 
engaging projections 432 of the fitting ribs 431 are disengaged from the 
circumference 31 of the circular hole 31 of the disc 30, permitting a user 
to easily take out the disc 30. 
FIGS. 7 and 8 respectively show two other embodiments of the present 
invention, in which the engaging members 43 can be lifted straight plates 
or lifted tapered plates. 
According to the above arrangements, the present invention has the 
following advantages: 
1. The engaging members 43 are connected to a pressing member 435 by the 
resilient bridge ribs 434 so that they have better structural strength. 
Therefore, in case the disc box is dropped onto the ground, the engaging 
members 43 are protected from breaking from two sides of the perforations 
433 due to shearing force of the disc 30. 
2. when taking out the disc 30, the pressing member 435 between the 
engaging members 43 is depressed, whereby by means of the resilient bridge 
ribs 434, the opposite fitting ribs 431 of the two engaging members 43 are 
driven and moved downward. At this time, the engaging projections 432 of 
the fitting ribs 431 are disengaged from the circumference 31 of the 
circular hole 31 of the disc 30, permitting the disc 30 to be easily take 
out. Therefore, a user can easily take out the disc 30 without damaging 
the engaging members 43 or the disc 30. 
The above embodiments are only used to illustrate the present invention, 
not intended to limit the scope thereof. Many modifications of the above 
embodiments can be made without departing from the spirit of the present 
invention.