Structure for opening/closing a case cover

A structure for opening/closing a cover for a case in which when the cover is closed, the cover closes an opening provided in an upper surface of the case, whereas when the cover is opened, the cover is guided at its engaging portions in guides provided on the case, so that the cover is folded in halves upward at a connection, the folded cover is moved by a movable element via one end of the case to below the case and then disposed there. For example, a cover 11 foldable in halves at a first hinge 14 is provided turnably by a second hinge 17 to a turnable plate 16 which is provided turnably by a third hinge 18 to a right-hand end of a device case 1. A pair of guide grooves 19 is provided on a device case 1 such that the pair of guide grooves extends to guide a corresponding pair of engaging pins 20 provided at a left-hand end of the cover 11 from a left-hand end of the upper surface of the case 1 to near a lower right-hand end of the case 1. When the cover 11 is opened, the engaging pins 20 are guided along the guide grooves 19 to fold the cover in halves. The folded cover 11 is then moved to below the case 1 via the right-hand end of the case 11 by the turnable plate 16 and then disposed below the case 1. Thus, when the cover is opened, it neither becomes an obstacle nor dangles. Thus, this structure improves handiness.

FIELD OF THE INVENTION 
The present invention relates to a structure for opening/closing a cover 
for a case. 
BACKGROUND ART 
Conventionally, in a mobile or portable electronic device, a display unit 
is provided within a case for the device to display information. The 
display unit is exposed through an opening provided in an upper surface of 
the device. The opening is closed with an openable cover to protect the 
display unit. 
In the structure for opening/closing the cover for the device, 
conventionally, a flat cover is hinged at one edge on an end of the device 
case so as to close the opening in the case. 
In such structure, however, the cover is hinged on the case, so that when 
the cover is opened to use the device, it can be an obstacle and dangle. 
Thus, it is not handy. 
It is an object of the present invention to provide a cover structure in 
which when the cover is open, it neither becomes an obstacle nor dangles. 
SUMMARY OF THE INVENTION 
In order to achieve the above object, according to the present invention, 
there is provided a structure for opening/closing a cover for closing an 
opening in an upper surface of a case, wherein: 
the cover is foldable in halves around a connection and having one end and 
the other end; and comprising: 
movable means provided at an end of the case and to which the cover is 
provided movably at its one end; 
engaging means provided at the other end of the cover for engaging slidably 
with the case; and 
guide means provided on the case for guiding the engaging means along an 
upper surface of the case and the one end of the case; 
whereby the case is folded in halves upward at the connection as the 
engaging means is guided by the guide means, moved to below the case via 
the end of the case by the movable means, and then disposed below the 
case. 
Thus, according to the present invention, when the cover is closed, the 
cover shuts the opening in the upper surface of the case whereas the when 
the cover is opened, it is guided at the engaging means by the guide means 
on the case to be folded in halves upward by the connection from the case, 
moved to below the case through the one edge of the case by the movable 
means, and then disposed below the case. Thus, when the cover is opened, 
it neither becomes an obstacle nor dangles. Therefore, this structure 
renders handy the structure for opening/closing the cover for the device 
case.

A BEST MODE FOR CARRYING OUT THE INVENTION 
Referring to FIGS. 1-9, a first embodiment of the present invention 
directed to a structure for opening/closing a cover for an electronic 
device will be described next. 
The electronic device is, for example, a mobile data processor with a case 
1, which includes, as shown in FIG. 4, an upper subcase 2, a middle 
subcase 3, and a lower subcase 4 with the middle subcase 3 being attached 
by screws 5 in the upper subcase 2 and with the lower subcase 4 being 
attached by screws 6 to a lower edge of the upper subcase 2. 
In this case, the middle subcase 3 has an opening 3a at its center with a 
display unit 7, for example, of a liquid crystal type being provided so as 
to align with the opening 3a between the middle and lower subcases 3 and 
4. An opening 8 aligning with the display unit 7 is provided a right-hand 
portion of the upper subcase 2 in FIG. 4. An attaching recess 9 
corresponding to the right-hand end of the opening 8 in the upper subcase 
2 is provided in the right-hand end of the lower subcase 4. The middle 
subcase 3 abuts at a lower edge of its right-hand end on an upper end of 
the recess 9. A receiving recess 10 continuing to the recess 9 is provided 
on the lower surface of the lower subcase 4. A tilt surface 9a is provided 
to a lower end of the recess 9 with four spaced supports 4a on the lower 
surface of the lower subcase 4. 
A cover 11 is provided openably for covering the opening 8 in the upper 
subcase 2. More particularly, in the cover 11, a first cover half 12 and a 
second cover half 13 are connected turnably by a first hinge (connection) 
14 so as to be folded. In this case, a torsion or biasing spring 15 is 
provided in the vicinity of the first hinge 14 so that the torsion spring 
15 is fixed at one end to an engaging lug 12a provided on an inner surface 
of the first cover half 12 and fixed at the other end to an engaging lug 
13a provided on an inner surface of the second cover half 13. Thus, the 
first hinge 14 is biased so as to fold the cover 11 upward from the upper 
subcase 2. 
As shown in FIG. 4, the cover 11 or hence the second cover half 13 is 
provided at its right-hand end by a second hinge 17 to an upper end of a 
turnable plate 16 provided at the right-hand end of the case 1. More 
particularly, the turnable plate 16 is provided turnably at its lower end 
by a third hinge 18 to the attaching recess 9 on the lower subcase 4 
corresponding to the right-hand end of the case 1. The turnable plate 16 
has a thickness which substantially corresponds to the depth of the recess 
9 on the lower subcase 4 so that when the turnable plate 16 is turned 
upward around the third hinge 18, the second hinge 17 is positioned on an 
upper end of the upper subcase 2 whereas when the turnable plate 16 is 
turned downward, it abuts on the tilt surface 9a at the lower end of the 
recess 9 so that the second hinge 17 is positioned in the recess 10 on the 
lower subcase 4. 
A pair of engaging pins 20 is provided at a left-hand end of the cover 11 
or first cover half 12 so as to protrude laterally outward from a 
corresponding pair of lugs 21 each provided on a respective one of 
opposite extremes of the left-hand end of the first cover half 12, and is 
slidably received in a corresponding pair of guide grooves 19 (FIGS. 2, 3) 
provided on a corresponding pair of opposite inner sides of the case 1. 
Each guide groove 19 is composed of a horizontal groove portion 19a 
provided between the upper and middle subcases 2 and 3 and a vertical 
groove portion 19b provided through the right-hand ends of the upper and 
lower subcase 2 and 4 so as to continue to the horizontal groove portion 
19b. More particularly, the horizontal groove portions 19a extend 
horizontally between the left-hand and right-hand ends of the case 1 and 
between the upper and middle subcases 2 and 3 whereas the vertical groove 
portions 19b extend vertically from the upper subcase 2 at the right-hand 
ends of the upper and lower subcases 2 and 4 on opposite sides of the 
opening 8 in the upper subcase 2 along opposite sides of the recess 9 on 
the lower subcase 4 through opposite sides of the third hinge 18 to the 
vicinity of the lower end of the lower subcase 4. The lugs 21 are provided 
for preventing the first cover half 12 from abutting at its left-hand end 
on the third hinge 18 when the engaging pins 20 pass by the opposite sides 
of the third hinge 18. 
Provided in the vicinity of the left-hand end of the upper surface of the 
case 1 and hence the upper subcase 2 is a hook 22 which is engaged with a 
left-hand end of the first cover half 12 when the cover 11 closes the 
opening 8 in the upper subcase 2. Provided at a midpoint of one side of 
the upper subcase 2 is a locker 23 which locks the cover 11 in a closed 
state. 
As shown in FIG. 4, the hook 22 is disposed in a cut 2a provided at a 
left-hand end of the opening 8 in the upper subcase 2 so that when a hook 
axle 22a is supported rotatably by a pair of attachments 24 provided on a 
lower surface of the upper subcase 2, the hook 22 is biased so as to turn 
upward by a spring 25 and hence a raise 22b provided on top of a free end 
of the hook 22 is engaged releasably with the left-hand end of the first 
cover half 12. The resiliency of the spring 25 is set so as to be smaller 
than that of the torsion spring 15 for the cover 11. 
The locker 23 is provided somewhat slidably on the right-hand side of the 
upper subcase 2 in the vicinity of its midpoint and hence the boundary 
between the first and second cover halves 12 and 13 (as viewed in FIG. 1) 
so that when the cover 11 is extended against the resiliency of the 
torsion spring 15 to close the opening 8 in the upper subcase 2, the cover 
11 suppresses a protrusion 26 provided on a side of the first cover half 
12 to prevent the first and second cover halves 12 and 13 from floating 
against the resiliency of the torsion spring 15 to thereby lock the cover 
11. 
A protrusion (not shown) which is engaged releasably in a recess (not 
shown) provided on a side of the second cover half 13 when the folded 
cover 11 is received in the recess 10 is provided in the receiving recess 
10 provided on the lower surface of the lower subcase 4. 
In operation, as shown in FIGS. 1 and 5, when the electronic device is not 
used, the opening 8 in the upper subcase 2 is closed by the cover 11. At 
this time, first, the first and second cover halves 12 and 13 are extended 
against the resiliency of the torsion spring 15 to engage the extended 
first cover half 12 at its left-hand end with the hook 22 provided on the 
upper subcase 2. More particularly, after the cover 11 is moved leftward 
in a state where the hook 22 is slightly pushed down against the 
resiliency of the spring 25, an external force is released from the hook 
22 to return same with the resiliency of the spring 25 to thereby engage 
the raise 22b with the left-hand end of the first cover half 12. 
Thereafter, the protrusion 26 provided on the side of the first cover half 
12 is suppressed with the locker 23 to lock the cover 11. Thus, without 
floating upward with the resiliency of the torsion spring 15, the cover 11 
is locked in a state where the cover 11 has closed the opening 8 in the 
upper subcase 2. Thus, the cover 11 protects the display unit 7 within the 
device case 1 to thereby allow the device to be carried about in a safe 
state. 
When the device is used, the locker 23 is slid to move same from the 
protrusion 26 on the first cover half 12 to release to the cover 11 from 
the locker 23. As shown in FIGS. 2 and 6, this turns the first and second 
cover halves and 12 and 13 around the first hinge 14 so as to come close 
to each other by the resiliency of the torsion spring 15. At this time, 
since the resiliency of the torsion spring 15 is larger than that of the 
spring 25 of the hook 22, the engagement of the hook 22 with the left-hand 
end of the first cover half 12 is automatically released. Thus, the cover 
11 is folded in halves so that the first hinge 14 is positioned up. 
Therefore, the engaging pins 20 of the first cover half 12 move along the 
horizontal groove portions 19a of the guide grooves 19 on the case 1, and 
the turnable plate 16 is pushed by the second cover half 13 to be turned 
downward around the third hinge 18. 
When the first and second cover halves 12 and 13 are further turned around 
the first hinge 14 so as to come close to each other, the cover 11 is 
folded to a further extent to move toward the right-hand end of the case 
1. As shown in FIGS. 3 and 7, the turnable plate 16 further turns so that 
the folded cover 11 extends rightward from the right-hand end of the case 
1 and the engaging pins 20 of the first cover half 12 move toward the 
right-hand ends of the horizontal guide groove portions 19a. Thus, the 
display unit 7 within the case 1 appears through the opening 8 in the 
upper subcase 2. When the engaging pins 20 of the first cover 12 move 
along the corresponding horizontal groove portions 19a, the lugs 21 on 
which the engaging pins 20 are provided support the left end of the first 
cover half 12 above the display unit 7. Thus, the left-hand end of the 
first half cover 12 moves without contacting with the display unit 7. 
Thereafter, when the user presses the cover 11, which has been folded to 
extend rightward, from above in the direction of arrow A in FIG. 7, the 
engaging pins 20 of the first cover half 12 move from the horizontal guide 
groove portions 19a to the vertical groove portions 19b, as shown in FIG. 
8. Thus, the first cover half 12 turns downward. Therefore, the second 
cover half 13 presses the turnable plate 16 down, so that the turnable 
plate 16 turns around the third hinge 18 to abut on the tilt surface 9a of 
the attaching recess 9. Thus, the second hinge 17 is positioned on the 
receiving recess 10 of the lower subcase 4. 
When in this state the cover 11 is pressed toward the lower surface of the 
lower subcase 4, the engaging pins 20 of the first cover half 12 move 
along the vertical guide groove portions 19b and the first cover half 12 
turns toward the lower surface of the lower subcase 4. 
At this time, the engaging pins 20 pass by opposite sides of the third 
hinge 18, the left-hand end (in FIG. 8, upper end) of the first cover half 
12 moves to below the third hinge 18 without contacting with the third 
hinge 18 by the lugs 21 on which the corresponding engaging pins 20 are 
provided. 
As the first cover half 12 moves, the second cover half 13 is pressed to 
turn around the second hinge 17, so that as shown in FIG. 9, the folded 
cover 11 is received within the receiving recess 10 of the lower subcase 
4. Although not shown, at this time, the protrusion (not shown) on the 
receiving recess 10 is engaged in the recess (not shown) on the side of 
the second cover half 13, and the folded cover 11 is locked within the 
recess 10. When the cover 11 is closed, operation reverse to that 
mentioned above is performed. 
As described above, in the particular structure for opening/closing the 
cover 11 for the electronic device, when the cover 11 is closed, the cover 
11 shuts the opening 8 in the case 1, so that the cover protects the 
display unit 7 within the case 1. When the cover 11 is opened, the 
engaging pins 20 on the cover 11 are guided along the guide grooves 19 in 
the case 1 and folded upward by the resiliency of the torsion spring 15. 
The folded cover 11 is moved to below the case 1 through the right-hand 
end of the case 1 by means of the turnable plate 16 and then received 
within the receiving recess 10. Thus, when the cover 11 is opened, the 
cover 11 does not become an obstacle, does not dangle when the cover is 
open, and is handy. In this case, by placing the electronic device on a 
desk or using the device by holding same with hands, the open cover 11 is 
pressed to below the case 1. Thus, the cover 11 is not necessarily 
required to be locked within the receiving recess 10 by engagement of the 
protrusion (not shown) on the receiving recess 10 with the recess (not 
shown) in the second cover half 13. 
In the structure for opening/closing the cover 11, the torsion spring 15 is 
provided on the cover 11 so that the torsion spring 15 biases the cover 11 
as to be folded. The resiliency of the torsion spring 15 is set so as to 
be larger than the engaging force of the engaging hook 22 which is engaged 
with the left-hand end of the first cover half 12 or the resiliency of the 
spring 25 of the hook 22. Thus, only by releasing the locked state of the 
cover 11 by the locker 23, the engagement of the cover 11 with the 
engaging hook 22 is released automatically by the resiliency of the 
torsion spring 15 to fold the cover 11 to protrude same rightward from the 
right-hand side of the case 1. Thereafter, the folded cover 11 is required 
to be moved to below the case 1 to thereby open the cover 11 easily. 
A second embodiment of the structure for opening/closing the case cover 
according to the invention will be described next with reference to FIGS. 
10A-10E. While in the first embodiment the turnable plate 16 is 
illustrated as movable means, the structure for opening/closing the cover 
11 of the second embodiment is provided additionally with a pair of 
engaging pins 30 at the right-hand end of the cover 11 which is engaged 
slidably within a corresponding pair of second vertical guide groove 
portions 31 (shown hatched) provided on the right-hand end of the case 1 
in superimposed relationship to the pair of vertical guide groove portions 
19b, as shown in FIG. 10A-E. 
When the cover 11 is opened in this structure, the cover 11 is first 
folded, as shown in FIG. 10A, to stand up folded in the vicinity of the 
right-hand end of the case 1, as shown in FIG. 10B. Thereafter, as shown 
in FIG. 10C, the engaging pins 30 at the right-hand end of the cover 11 
move down the case 1 along the second vertical guide portions 31 to 
protrude the folded cover 11 rightward from the right-hand end of the case 
1. The left-hand side engaging pins 20 are then moved downward along the 
vertical guide groove portions 19b to align with the right-hand side 
engaging pins 30 to thereby fold the cover 11 completely, as shown in FIG. 
10D. By the turning the folded cover 11 to below the case 1 around the 
coinciding engaging pins 20 and 30, as shown in FIG. 10E, the cover 11 is 
received within the receiving recess 10. 
A third embodiment of the invention will be described next with reference 
to FIGS. 11A-E. In the structure for opening/closing the cover 11 of the 
third embodiment, a rotating body 32 is provided rotatably around an axle 
32a at the right-hand end of the case 1, as shown in FIGS. 11A-E. The 
cover 11 is supported turnably by a pair of support pins 33 at the 
right-hand end thereof in a pair of corresponding rightward semi-circular 
guide grooves (not shown) provided on the rotating body 32. A pair of 
rightward semi-circular guide groove portions l9c through which the pair 
of pins 20 slides is also provided on the rotating body 32 in 
superimposing relationship to the pair of first-mentioned semi-circular 
guide grooves through which the pair of pins 33 slides so that the pins 20 
and 33 can align at the lowest end of the groove portions 19c, as shown in 
FIG. 11D. 
When the cover 11 is opened in this embodiment, the cover 11 is first 
folded as shown in FIG. 11A, and then stands up folded in the vicinity of 
the right-hand end of the case, as shown in FIG. 11B. Then, as shown in 
FIG. 11C, the attaching pins 33 of the cover 11 turn the rotating body 32. 
Along with this rotation, the pins 33 move, and the engaging pins 20 
present at the left-hand end of the cover 11 move from the horizontal 
guide groove portions 19a to the semi-circular guide groove portions 19c 
to protrude the folded cover 11 rightward from the right-hand end of the 
case 1. As shown in FIG. 11D, the left-hand engaging pins 20 are then 
moved downward along the semi-circular guide groove portions 19c to align 
with the pins 33 to thereby fold the cover 11 completely in halves. In 
this state, the folded cover 11 is turned to below the case 1 around the 
aligning pins 20 and 33 to place the cover 11 in the receiving recess 10, 
as shown in FIG. 11E. 
While in the first-third embodiments the cover is illustrated as applied to 
the mobile or portable electronic devices, the present invention is not 
limited to those particular cases. For example, the invention is 
applicable widely to the structures for opening/closing covers for 
electronic devices such as portable telephone, jewel boxes and/or music 
boxes.