JPH11276304A - Top plate switchgear for bed - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely and stably open and close a top plate between an open position and a closed position. SOLUTION: This switchgear 4 is provided with a top plate side supporting body 20 attached to the end part on a turning center side of the top plate 14 and a bed main body side supporting body 21 attached near the end part on the turning center side of the top plate 14 and a first link 22 is disposed by freely turnably and pivotally connecting its both end parts 22a and 22b over the top plate side supporting body 20 and the bed main body side supporting body 21. Also, one end part 23a of a second link 23 whose length is longer than the first link 22 is freely turnably and pivotally connected on the turning tip side of the top plate 14 from the pivotally connecting part of the first link 22 of the top plate side supporting body 20, the other end part 23b of the second link 23 is freely turnably and pivotally connected to the bed main body side supporting body 21 and a stopper 27 controls the top plate side supporting body 20 so as not to deviate from the moving range between the closed position and the open position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bed for sleeping and, more particularly, to an opening and closing device for rotatably opening and closing a top plate on an upper portion of a bed body having an open upper surface.

[0002]

2. Description of the Related Art Conventionally, as an example of a bed in which a bed is placed on an upper surface of a top plate, Japanese Utility Model Publication No. 5-17977 has been used.
There is one shown in Japanese Patent Publication No. As shown in FIG. 8, this bed has a box-shaped bed body 100 having an open upper surface.
, A top plate 101 is provided in an openable and closable manner via a hinge 102 (a broken link). In this bed, after the top plate 101 is lifted and opened, the folded bedding or the bedding can be stored inside the bed body 100.

In the above-described conventional bed, the top plate 101 is attached to the bed body 100 through a general hinge 102, so that when the top plate 101 is opened and closed, the vicinity of the hinge 102 of the top plate 101 Portion hardly moves with respect to the bed body 100. Then, in the hinge 102 portion, there is a problem that it is difficult to remove the accumulated dust and the dust is easily accumulated. Further, since the top plate 101 is rotated about the hinge 102, when the bed is used near the wall, the hinge 10
The end of the top plate 101 rotating about the hinge 2 on the hinge 102 side may interfere with the wall. For this reason, there was a problem that the bed could not be used near the wall in some cases.

[0004] In order to solve such a problem,
In Japanese Utility Model Publication No. 3-33887, it is not a bed,
An underfloor storage opening and closing device is disclosed. That is, as shown in FIG. 9, the first link 107 and the second link 108 are connected to the support 1 on the back side of the tatami 109 at the opening 106 of the storage main body 105 for storing articles under the floor of the Japanese-style room.
10 and a support 111 under the floor, and a tatami 109
Are rotatably opened and closed. Reference numeral 112 denotes a gas spring, which urges the tatami 109 in the opening direction,
The opening and closing operation of the tatami 109 by human power is reduced, and the open state is maintained.

[0005]

By the way, even if such a device for opening and closing the underfloor storage is applied to a bed,
There are still various problems as described below.

First, the conventional opening / closing device cannot restrict the moving range of the top plate between the open position and the closed position. If a force is applied to the link, the link or the gas spring may be damaged due to excessive force. In addition, when the top plate is in the closed state, the opening / closing bracket cannot maintain the closed state by itself, so that when the load such as the weight of a person is applied to the top plate, the support of the top plate becomes insufficient. .

Second, it takes time to attach the top plate to the bed body. That is, in order to attach the top plate to the bed body, first, the bed body side support of the opening / closing bracket is fixed to the bed body with, for example, screws, and the opening / closing bracket is fully opened. After aligning the top plate with the support, the top plate is fixed to the top-side support by, for example, screws, but it is not easy to accurately position the large and heavy top plate on the top-side support. Even if the position is once adjusted, it is easy to be displaced, and in this case, the screw cannot be fixed.

Third, an expensive gas spring is required to operate the top plate with a light force or maintain the open state, and the cost of the opening and closing device and thus the bed increases.

The present invention has been made in view of the above-mentioned problems of the prior art, and allows the top plate to be reliably opened and closed between the closed position and the open position, and the closed top plate to be stably opened. It is an object of the present invention to provide a bed top opening and closing device that can be supported. A further object of the present invention is to provide a bed top opening / closing device that can easily and accurately position the top plate on the top plate-side support when the bed is assembled, and to open and close the top plate with a small force. An object of the present invention is to provide a bed top opening and closing device which can be performed and is inexpensive.

[0010]

According to the present invention, there is provided an opening / closing device for rotatably opening and closing a top plate on an upper portion of a bed body having an open upper surface. A top plate-side support attached to the back surface of the end of the plate on the rotation center side, and a bed body-side support attached to the bed body near the end on the rotation center side of the top plate, A first link is rotatably connected to both ends of the first link over the top plate-side support and the bed body-side support, and one end of a second link having a length longer than the first link. Part is pivotally connected to the top plate-side support so as to be rotatable at a pivotal tip side of the top plate from a pivot connection point of the first link, and the other end of the second link is The bed-side support is pivotally connected to the bed body-side support, and further, the moving position of the top-plate-side support is The is characterized in that it comprises a stopper means for restricting to not deviate from the pivot range between its closed and open positions. Here, the stopper means is a projection provided on the top-plate-side support, and the projection is provided on the upper edge of the first link when the top-plate-side support is in the closed position. The second link is in contact with the lower edge of the second link when the top plate-side support is in the open position.

In the present invention, when the top plate is closed, the top plate opening / closing device is in the fully closed state, and the stopper of the top plate-side support member abuts on the upper edge of the first link.
The angle between the top plate-side support and the first link is regulated,
As a result, the movement of each link is restricted, and the top-side support is held at the closed position (horizontal state), and does not drop below this state. Therefore, the own weight of the top plate and the weight of the user can be supported by each opening and closing device in addition to the side wall of the bed body. When you lift the free end of the top plate,
As the first link and the second link rise and swing, the top-side support rises and tilts, so that the top also gradually rises and opens. Since the stopper abuts on the lower edge of the second link and the angle formed between the top plate-side support and the second link is restricted, the top plate is not erroneously lifted further and damage to the opening / closing device can be prevented. .

According to another aspect of the present invention, a positioning means for positioning the top-side support on the top-side is provided on a contact surface between the top-side support and the top-side. Here, the positioning means includes a positioning pin provided on each of the contact surfaces of the top plate-side support and the top plate, and a pin insertion hole that can be fitted with the positioning pin. . In the present invention, in order to attach the top plate to the bed body, first, the bed body side support of the opening / closing fitting is fixed to the bed body with, for example, a screw or the like, and the opening / closing fitting is fully opened. The top plate is aligned with the opening / closing bracket so that the positioning pins of the top plate-side support are inserted into the pin insertion holes of the top plate.
In this state, the relative position between the top plate and the top plate-side support is not shifted, and the work of fixing the top plate to the top plate-side support with, for example, screws is facilitated.

In another aspect of the present invention, at least one of the ends of the first link and the second link is connected to the top-side support member or the top plate to which the ends are pivotally connected. A spring washer is interposed between the bed body-side support and the bed body-side support. In the present invention, at least one end of each of the first link and the second link has an appropriate frictional force to perform a rotating operation by the elastic force of the spring washer. In addition to stabilizing the opening and closing of the plate, the first link and the second link do not easily rotate in the closing direction even when the top plate is lifted and released by releasing the hand from the top plate.

According to still another aspect of the present invention, a pivotal connection between the first link and the top plate-side support and a pivotal connection between the second link and the bed body-side support are provided. A tension coil spring is provided, and a spring cover that covers a portion other than both ends of the tension coil spring and that can expand and contract with the expansion and contraction of the tension coil spring is provided. In the present invention,
The first link is urged in the upright direction (opening direction) by the elastic expansion and contraction force of the tension coil spring, which is cheaper than the gas spring, so that the opening operation of the top plate by human power can be performed with a light force. . Also, the tension coil spring
Because it is covered with a spring cover that can expand and contract with its expansion and contraction, objects and human hands are not caught between the windings of the tension coil spring, and it is safe.
It can be used even if the strength (number of turns) of the tension coil spring is changed.

[0015]

Next, embodiments of the present invention will be described with reference to the drawings. First, an example of a bed according to the present invention will be described with reference to FIGS.

The bed is mainly composed of a bed body 1 having a substantially box shape with an open upper surface, and the bed body 1
A first lid 2 and a second lid 3 rotatably mounted between a horizontal state (see FIG. 2) and an inclined state (see FIG. 1) to close or open the opening;
The first lid 2 and the second lid 3 are respectively connected to the bed body 1
A pair of opening and closing devices 4 and 5 for supporting the opening and closing freely.
Are provided.

The bed body 1 includes a pair of side plates 6a, 6b,
The headboard 7, the footboard 8, the middle partition plate 9, the bottom plate 10 and the like are interconnected by an L-shaped bracket 11 and the like, and can be disassembled. Note that the bottom plate 10 may not be provided. The middle partition plate 9 partitions the storage space in the bed body 1 in the length direction, whereby the storage space in the bed body 1 is divided into a first space K1 and a second space K2. Each of the first space K1 and the second space K2 is opened or closed by the first lid 2 and the second lid 3, respectively. When the first lid 2 and the second lid 3 are each in the closed state, the first lid 2 and the second lid 3 are supported on the side plates 6 a and 6 b of the bed main body 1 and the partition plate 9.

The length L and the length M of the partitioned first space K1 and second space K2 in the bed body 1 in the length direction of the bed body 1 (left and right directions in FIG. 2) (see FIG. 2). Is about 3 to 2 (or 2 to 1), for example.
Degree). As a result, in the first space K1 and the second space K2, the folded futon 1 is folded.
2 and the bedding 13 can be stored neatly. That is, the types of batting are different between the bedding 12 and the bedding 13, and the bedding 12 has a high density batting so as to support the weight of the user. A low-density batting is used so that a large amount of air can be contained therein and the weight can be reduced. For this reason, the volume ratio of the two in the folded state is usually about 3 to 2 (or 2
About 1).

The first lid 2 is composed of a rectangular plate-shaped top plate 14 (or a rectangular frame-shaped top frame) and a cushion body (for example, a tatami mat) 15 detachably mounted on the top plate 14. It is configured. Similarly to the first lid 2, the second lid 3 also
6 and a tatami mat 17, and have the same structure except that the length of the first lid 2 is two to three. In addition, on both the bottom surfaces of the first space K1 and the second space K2, a snowboard 18 and a snowboard 19 (see FIG. 2) are laid.

Both ends in the length direction of the first lid 2 are
It is supported on the bed body 1 by a pair of top plate opening / closing devices 4 and 5 according to the present invention. Both ends in the length direction of the second lid 3 are also provided with a pair of the top plate opening / closing devices 4 according to the present invention.
5 support the bed body 1. Reference numerals 9a to 9d denote covers that are detachably attached to the bed body 1 and cover the top plate opening / closing devices 4 and 5, respectively.

Here, the detailed structure of the top plate opening / closing device according to the present invention will be described. FIG. 3 is a front view of the top plate opening / closing device 4 on the rear end side of each of the top plates 14, 16 among the four top plate opening / closing devices 4, 5 shown in FIG. 1, and FIGS. 4 (a) and 4 (b). 4 is a cross-sectional view including a first link and a second link of FIG. 3. Since the top plate opening and closing device 4 of each of the top plates 14 and 16 has the same structure, the opening and closing device 4 on the top plate 14 will be described as an example.

The main structure of the top plate opening / closing device 4 is as follows.
The top plate-side support plate 20 (top plate-side support member) attached to the back surface of the end on the rotation center side of 4, and the partition plate 9 of the bed body 1 (the foot board 8 of the bed body 1 for the top plate 16)
A bed body-side support plate 21 (bed body-side support) attached near the end of the top plate 14 on the rotation center side, a first link 22, a second link 23, and a tension coil spring 24. It is.

The top plate-side support plate 20 has an inverted L-shaped cross section, and is attached to the back surface of the top plate 14 with screws 28 or the like on the upper surface of one side (the surface in contact with the top plate 14). A plurality of (two in this example) positioning pins 25 to be described later are protrudingly provided on the upper surface.
Can be fitted into the pin insertion holes 26 of the top plate 14, respectively. Each positioning pin 25 and pin insertion hole 2
6, a positioning means is constituted. A projection 27 (stopper means), which will be described later, is integrally provided on the other side of the top-side support plate 20. The bed body side plate 21 has a rectangular shape which is bent so that an intermediate portion in the vertical direction protrudes, and is fixed to the partition plate 9 with screws 29 at four corners thereof.

A first link 22 spans the top plate-side support plate 20 and the bed body-side support plate 21 by pivotally connecting both ends 22a and 22b thereof, respectively. More specifically, one end 22a of the first link 22 is rotatably supported by the top plate-side support plate 20 via a pin member 30 and a washer 31, and a tension coil spring described later is attached to the pin member 30. 24 (see FIG. 6) is formed with a groove 30a that can lock the hook 24b at one end. The other end 22b of the first link 22
The bed body-side support plate 21 is rotatably supported by the bed body-side support plate 21 via a pin member 32 and a spring washer 33.
1 and is in a flat plate state. This spring washer 3
3 is in a bent state as shown in FIG. 5 when in a free state, and thus the spring washer 33 in a flat state as described above generates an elastic force that returns to bend.
The other end 22b of the first link 22 rotates with an appropriate frictional force. The spring washer 33 is not limited to being provided on the other end 22b side of the first link 22, but may be a spring washer for the washer 31 on the one end 22a side of the first link 22, or a second link 23 described later. Spring washers may be used for the washers 35, 37 at the ends 23a, 23b.

The second link 23 is longer than the first link 22. The two links 23a and 23b are pivotally connected to the top plate-side support plate 20 and the bed body-side support plate 21 so as to be rotatable. It is erected. More specifically, one end 23a of the second link 23 is
4 and the washer 35, the top plate-side support plate 2
The first link 22 is pivotally connected to a pivotal tip of the top plate 14 from a pivotal connection point 22 a of the first link 22. The other end 23b of the second link 23 is connected to the bed member side support plate 21 by a pin member 36 and a washer 37.
Is pivotally connected via a. The pin member 36 is formed with a groove 36a capable of engaging the hook 24a at the other end of the tension coil spring 24 (see FIG. 6) described later.

The pivotal connection of the other end 23b of the second link 23 is slightly higher than that of the first link 22. When the first link 22 and the second link 23 are closed as shown by solid lines, the first link 22 and the second link 23 are closed.
The pivotal connection points 22a and 23a at one end of each of the link 22 and the second link 23 are at the same height, and the inclination angle of the second link 23 is slightly smaller than that of the first link 22, but is substantially equal to each other. Parallel. In FIG. 3, the two-dot chain line 14 indicates a top plate that is open, for example, inclined at about 80 degrees. At this time, the first link and the second link are, as shown by two-dot chain lines 22 and 23, respectively. Each is almost in a standing state (open position).

A stopper 27 (stopper means) is protruded from a part of the other side of the top plate side support plate 20.
Is in a horizontal state (closed position), it abuts on the upper edge of the first link 22 to keep the top plate side support plate 20 horizontal and prevent it from descending.
Is in contact with the lower edge of the second link 23 when the top plate 14 is in the opened state, to prevent the top plate 14 from being further opened. The stopper 27 is provided on the top plate-side support plate 20.
May be formed by press working, or separately provided by welding or the like.

A tension coil spring 24 is stretched over the pin member 30 on the one end 22a side of the first link 22 and the pin member 36 on the other end 23b side of the second link 23. Due to the elastic force of the spring 24, the first
Since the link 22 is urged in the rising direction (opening direction), the opening operation of the top plate 14 by human power can be performed with a light force. When the top plate-side support plate 20 is at the closed position (solid line), the tension coil spring 24 is in an extended state (see FIG. 6B), and the top plate-side support plate 20
Gradually rises to the open position (two-dot chain line)
It gradually shrinks to the state shown in FIG. Since the first lid 2 is larger and heavier than the second lid 3, the tension coil springs 24 of the opening and closing devices 4 and 5 of the first lid 2 are
The tension coil spring 2 of each of the opening / closing devices 4 and 5 of the second lid 3
Something stronger than 4 is used.

As shown in FIGS. 6 (a) and 6 (b), the portion other than the hooks 24a and 24b at both ends of the tension coil spring 24, ie, the winding portion, is divided into two parts consisting of a first cover 38a and a second cover 38b. It is covered by a spring cover 38. That is, the first cover 38a is made of, for example, a soft resin that can be easily elastically deformed, and is a cylindrical body having a length substantially equal to the free height of the tension coil spring 24. Coil spring 2
4 are inserted. One end of the first cover 38a is provided with a flange portion 39 that is hooked between the hook 24b of the tension coil spring 24 and the winding portion. The second cover 38b differs only in that it has a slightly larger diameter than the first cover 38a, and the first cover 38a is inserted into the second cover 38b. The flange portion 40 at one end of the second cover 38b is hooked between the hook 24a at the other end of the tension coil spring 24 and the winding portion.

As described above, the first cover 38a and the second cover 38a
Since the respective flange portions 39 and 40 of the cover 38b are locked at the ends of the winding portion, when the contracted tension coil spring 24 (see FIG. 6A) expands, FIG.
As shown in the figure, the first cover 38a is moved from the second cover 38b.
Appears, and the entire spring cover 38 extends. in this way,
In the present embodiment, since the tension coil spring 24 is covered by the spring cover 38 which can expand and contract with the expansion and contraction, the winding portion of the tension coil spring 24 is a spring regardless of the expansion and contraction state of the tension coil spring 38. Cover 38
Always covered with. Therefore, objects and hands are not trapped between the windings of the tension coil spring 24, and the spring cover 38 is secured.
Can be used even if the strength (number of turns) of the is changed. Note that the spring cover 38 is not limited to the above-described two-split type, and for example, a bellows having flange portions at both ends may be used.

FIG. 7 is a front view of the top plate opening / closing device 5 on the front end side of each of the top plates 14 and 16.
As compared with the top plate opening / closing device 4 (see FIG. 3) on the rear end side of each of the top plates 14 and 16, the arrangement of each member is in a point-symmetric relationship.
It is structurally identical. And the bed body side support plate 20 of the opening / closing fitting 5 on the front end side of the first lid 2
Is attached to the inner surface of the headboard 7, and the second
The bed body side support plate 20 of the opening / closing fitting 5 on the front end side of the lid 3 is attached to the partition 9.

Next, an example of the operation of the opening / closing device of this embodiment and a method of using the bed will be described. First, when the first lid 2 and the second lid 3 are each in the horizontal state, each of the storage spaces K1 and K2 of the bed body 1 is closed (see FIG. 2). The bedding 12 is laid on the first lid 2 and the second lid 3, and the user can sleep on the bedding 12.

At this time, the state of each of the opening and closing devices 4 and 5 is such that the stopper 27 of the top plate side support plate 20 abuts on the upper edge of the first link 22 as shown by the solid line in FIGS. Accordingly, the angle formed between the top plate-side support plate 20 and the first link 22 is regulated, and as a result, the movement of each of the links 22 and 23 is regulated, and the top plate-side support plate 20 and the top plate 14 ( The top plate 16) is in a horizontal state (open state).
And does not descend any further. In addition to the weight of the first lid 2 and the second lid 3 and the weight of the user, in addition to the side walls 6 a and 6 b of the bed body 1, the opening and closing devices 4 and 5
Can also be supported.

After getting up, the bedding on each of the lids 2 and 3 is removed, and the free end side of the first lid 2 is manually lifted. When the first link 22 and the second link 23 rise and swing. Since the top plate-side support plate 20 rises and tilts, the top plate 14 also gradually rises and opens. At this time, the first link 22 is urged in the direction in which it rises (opens) by the elastic expansion and contraction force of the tension coil spring 24, so that the opening operation of the top plate 14 by human power can be performed with a light force. Further, the pivotal connection on the other end 22b side of the first link 22 involves an appropriate frictional force to perform a rotating operation by the elastic force of the spring washer 33, so that the opening operation of the top plate 14 is stable. In addition to the above, the first link 22 and the second link 23
Does not easily rotate in the closing direction.

As described above, when the top plate-side support plate 20 gradually inclines and reaches the open position (see the two-dot chain line), the stopper 27 abuts on the lower edge of the second link 23, and the top plate side The angle formed between the support plate 20 and the second link 23 is restricted, and the top plate-side support plate 20 is no longer inclined. Therefore, the top plate 14 is not further lifted by mistake, and damage to the opening / closing device 4 can be prevented. The top plate 14 is held at the open position by the elastic force of the tension coil spring 24. In the same manner as above, the second lid 3 is opened and held at the open position.

Here, after the bedding futon 12 and the hanging futon 13 are stored in each of the opened storage spaces K1 and K2 in the bed body 1, the free end of the first lid 2 is pushed down manually. When the operation reverse to the above operation is performed and the stopper 27 of the top plate-side support plate 20 abuts on the upper edge of the first link 22, the top plate-side support body 20 is held in a substantially horizontal state, and It is closed. Similarly, the second lid is also in the fully closed position.

In the present embodiment, the top plate 14 is
First, the bed body side plate 21 of the opening / closing fitting 4 (5) is attached to the bed body 1 with a screw or the like.
And the opening / closing bracket 4 (5) is fully opened. Here, the positioning pin 25 of the top plate side support plate 20 of the opening / closing bracket 4 (5) is inserted into the pin insertion hole 26 of the top board 14. The top plate 14 is aligned with the top plate-side support plate 20. In this state, the top plate 14 and the top plate side support plate 20
And the top plate 14 can be easily fixed to the top plate 20 by, for example, screws. The number of positioning pins is not limited to two, and may be a single pin or another plural number. Further, a positioning pin may be provided on the top plate side, and a pin insertion hole may be provided on the opening / closing device side.

In the above embodiment, each lid is supported by a pair of opening and closing devices. However, each lid may be supported by one opening and closing device. Further, the bed body is not limited to a single box body having a partition plate, and the bed body may be configured by connecting the first body and the second body each having a box shape. In addition, if the lid is 2
The opening of the bed body is not limited to being divided, and may be opened and closed with a single large lid.

[0039]

Since the present invention is configured as described above, it has the following effects. According to the first and second aspects of the present invention, when the top plate is closed, the top plate opening / closing device is in a fully closed state, and the stopper of the top plate-side support member contacts the upper edge of the first link. As a result, the angle between the top support and the first link is regulated, and as a result, the movement of each link is regulated, and the top support is held in the closed position (horizontal state). It does not fall below the state. Therefore, the own weight of the top plate and the weight of the user can be supported by each opening and closing device in addition to the side wall of the bed body. When the free end of the top plate is lifted, the first link and the second link rise and swing,
Since the top-side support rises and tilts, the top also gradually rises and opens. Since the stopper abuts on the lower edge of the second link and the angle formed between the top plate-side support and the second link is restricted, the top plate is not erroneously lifted further and damage to the opening / closing device can be prevented. . As described above, with the simple configuration such as the protrusion, the top plate can be reliably opened and closed between the open position and the closed position.

According to the third and fourth aspects of the present invention,
To attach the top plate to the bed body, first, the bed body side support of the opening / closing bracket is fixed to the bed body with, for example, screws, and the opening / closing bracket is fully opened. The top plate is aligned with the opening / closing bracket such that the positioning pin is inserted into the pin through hole of the top plate. In this state, the relative position between the top plate and the top plate-side support is not shifted, and the work of fixing the top plate to the top plate-side support with, for example, screws is facilitated. As a result, the workability of assembling the bed is improved.

According to a fifth aspect of the present invention, at least one of the ends of the first link and the second link is appropriately rotated by the elastic force of the spring washer. Because of the frictional force, the opening and closing of the top plate is stabilized, and even if the top plate is lifted and released from the top plate, the first link and the second link can be easily closed. Does not rotate.

According to the sixth aspect of the present invention, the first link is urged in the upright direction (opening direction) by the elastic expansion and contraction force of the tension coil spring, which is cheaper than the gas spring, so that the first link can be manually operated. The opening operation of the plate can be performed with a light force. In addition, since the tension coil spring is covered by a spring cover that can expand and contract with the expansion and contraction, objects and hands are not trapped between the windings of the tension coil spring, and the spring cover is safe. It can be used even when the strength (number of turns) of the tension coil spring is changed.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing an example of a bed according to the present invention in a state where each lid is opened.

FIG. 2 is a schematic cross-sectional view showing an example of a bed according to the present invention in a state where each lid is closed, and a top plate opening / closing device is not shown.

3 is a front view of a top plate opening / closing device on the back side of a bed among a pair of top plate opening / closing devices for respectively opening and closing the two top plates shown in FIG. 1;

4A and 4B are cross-sectional views including a first link and a second link of FIG. 3, respectively.

FIG. 5 is a sectional view of the spring washer in a free state.

FIGS. 6A and 6B are cross-sectional views showing a contracted state and an expanded state of a tension coil spring, respectively.

7 is a front view of a top plate opening / closing device on the front side of a bed among a pair of top plate opening / closing devices for respectively opening and closing the two top plates shown in FIG. 1;

FIG. 8 is a schematic view of a conventional retractable bed.

FIG. 9 is a schematic view of an opening / closing device for an underfloor storage according to the related art.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Bed main body 2 1st lid 3 2nd lid 4,5 Top plate opening / closing device 14, 16 Top plate 20 Top plate side support plate (top plate side support) 21 Bed body side support plate (bed body side support) 22) First link 22a, 22b Pivot connection part 23 Second link 23a, 23b Pivot connection part 24 Tension coil spring 24a, 24b Hook 27 Stopper (stopper means) 33 Spring washer 38 Spring cover

Claims (6)

[Claims] 1. An opening / closing device for supporting a top plate so as to be rotatable and openable on an upper portion of a bed body having an open upper surface,
A top plate-side support attached to the back surface of the rotation center side end of the top plate; and a bed body-side support attached to the bed body near the rotation center side end of the top plate. A first link is rotatably connected to both ends of the first link over the top plate-side support and the bed body-side support, and the second link is longer than the first link. Is rotatably pivotally connected to a pivotal tip of the top plate from a pivotal connection point of the first link of the top plate side support, and the other end of the second link is connected to the other end of the second link. A stopper pivotally connected to the bed body-side support so as to be rotatable, and further restricts a movement position of the top-plate-side support from being out of a rotation range between the closed position and the open position. Means for opening and closing a top plate of a bed, characterized by comprising means. 2. The stopper means is a projection provided on the top-side support, and the projection is provided at an upper edge of the first link when the top-side support is at a closed position. 2. The bed top opening and closing device according to claim 1, wherein the top link is in contact with the lower edge of the second link when the top support is in the open position. 3. 3. A positioning means for positioning the top-side support and the top plate relative to each other on the contact surface between the top-side support and the top plate. The bed top plate opening / closing device according to claim 2. 4. The positioning means is a positioning pin provided on each of the contact surfaces of the top plate-side support and the top plate, and a pin insertion hole engageable with the positioning pin. Bed top opening and closing device. 5. The top plate-side support or the bed body-side support to which at least one end of each of the first link and the second link is connected and the end is pivotally connected. The top plate opening / closing device for a bed according to any one of claims 1 to 4, wherein a spring washer is sandwiched between the body and the body. 6. A tension coil spring extends between a pivotal connection between the first link and the top plate-side support and a pivotal connection between the second link and the bed body-side support. 6. A spring cover which is provided and covers a portion other than both ends of the extension coil spring and is extendable and contractable with extension and contraction of the extension coil spring. Item 8. A bed top opening / closing device according to the above item.