JPH0449405B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention provides a chair with a footrest, in which a footrest is rotatably disposed at the front end of a seat, and the footrest can be taken in and out by the rotation. It is related to.

[Background technology] A chair in which the footrest is movable from a state stored below the seat to a state pulled out to the front of the seat using a link or slide mechanism was developed in 1983.
Although a large number of such devices have been provided in the past, as seen in Japanese Utility Model Publication No. 150431 and Japanese Utility Model Application Publication No. 59-8643, they have the following problems. That is, in the case where the footrest is slid to move from below the seat to the front of the seat until the top surface becomes almost parallel to the top surface of the seat,
If the footrest is put in and taken out while sitting on the seat, the footrest will pull on the user's clothes, causing discomfort to the user.

Even in chairs that are moved in and out by rotating the footrest, the user's knee joints are located above the front end of the seat, whereas the center of rotation of the footrest is located on the lower surface of the front end of the chair. Since the footrest is located at the top of the footrest, there is still a problem in that the user's clothes are pulled when the footrest is taken in and out.

[Object of the Invention] The present invention has been made in view of the above points, and its purpose is to prevent the user's clothes from being pulled when putting in and taking out the footrest, and to make the user's clothes comfortable. To provide a chair with a footrest that can be used, and that allows the footrest to be taken in and out easily by a tension spring force, and also maintains the usable state and stored state of the footrest by a tension spring. is to provide.

[Disclosure of the Invention] The present invention provides a chair with a footrest in which a footrest is rotatably disposed at the front end of the seat of the chair so that the footrest can be taken in and out. It is characterized by being set at a position above the front end of the seat,
The foot rest can be rotated around the knee joint of the user sitting on the seat, and the foot rest can be rotated around the knee joint of the user sitting on the seat. The link mechanism is biased to raise the footrest and move it to a usable position when the footrest rotates upward, and lowers the footrest when the footrest rotates downward. By providing a tension spring with a reversing action that urges the footrest to be moved to the storage position, it is possible to easily move the footrest up and down when putting it in and taking it out using the spring force of the tension spring. It is something.

The present invention will be described in detail below based on the illustrated embodiment.The illustrated chair has a pine surge machine built into its backrest 4, and as shown in FIG. , a seat portion 2 disposed on the upper surface of the frame 1, and a seat portion 2 disposed on the upper surface of the frame 1;
a backrest 4 whose lower end is pivoted by an axis 40;
, a pair of armrests 5, 5 whose lower ends are connected to both upper sides of the frame 1, and a link mechanism 7 to the frame 1.
The backrest 4 is made up of a footrest 6 attached via a footrest 6, and the backrest 4 can be reclined freely, as is clear from FIG.

First, the reclining mechanism of the backrest 4 will be explained. As mentioned above, the lower end of the backrest 4 is pivotally connected to the frame 1, and the fixing piece 11 is fixed to the center of the lower end of the backrest 4 and the upper part of the front end of the frame 1. By installing a gas spring 8 between them, the backrest 4 is held at a predetermined angle, and the angle of the backrest 4 is changed by operating the gas spring 8 by operating a reclining lever 9 arranged on the backrest 4. We are making it possible to do this.

As shown in FIG. 6, the gas spring 8 includes a cylinder 81 filled with high-pressure gas and a cylinder 8.
1, a valve (not shown) provided on the piston at one end of the piston rod 82, and a push rod 83 for opening and closing this valve. 4, and a piston rod 82 is connected to the frame 1 via a mounting piece 86 and a pin 87. When a lever 88 rotatably held by a mounting piece 86 rotates, pushing a push rod 83 that passes through the piston rod 82 and moving it in the axial direction, the valve opens. gas spring 8
The gas pressure causes the piston rod 82 to protrude and expand.

As shown in FIG. 6, the reclining lever 9 includes a support plate 93 fixed to the backrest 4, a rotating piece 92 rotatably attached to the support plate 93 on a shaft 97, and a tip of the rotating piece 92. and an operating piece 91 rotatably connected by a shaft 95, and since the operating piece 91 is provided with a stopper 96 that comes into contact with the rotating piece 92, the rotation range with respect to the rotating piece 92 is limited. has become regulated.

Since the rotating piece 92 and the lever 88 are connected by a wire 89, when the operating piece 91 of the reclining lever 9 is pulled upward from the position indicated by the solid line in the figure, the rotating piece 92 also moves upward. Lever 8 is connected via wire 89 to rotate together.
8 is activated and the valve is opened. At this time, if you put your weight on the backrest 4, the backrest 4 will fall backwards, and if you don't put your weight on it, the gas spring 8
The backrest 4 rises due to the stretching force. When the reclining lever 9 is returned to the solid line position, the valve closes and the gas spring 8 is locked.
The backrest 4 is fixed at that angle.

Here, move the reclining lever 9 to the operating piece 91.
The structure is made up of two members: and a rotating piece 92.When the reclining lever 9 is in the position shown by the solid line in the figure, if the user tries to stand up with his or her hand on the reclining lever 9. This is because only the operation piece 91 rotates downward in the figure, thereby preventing excessive load from being applied to the support plate 93. Note that the rotating piece 92 of the reclining lever 9 and the connecting portion between the operating piece 91 and the rotating piece 92 are housed in a cover 42 provided on the back frame 41 of the backrest 4 so that they cannot be touched, as shown in FIG. I've made it impossible to do so. In the figure, reference numeral 43 denotes core materials arranged on both sides of the backrest 4 and on each front surface of the upper part. Further, since the backrest 4 is equipped with a pine surge machine, the structural strength is increased by attaching connection bars 45 to the four corners of the back frame 41.

Now, regarding the link mechanism 7 that attaches the footrest 6 to the frame 1, this link mechanism 7 arranged below the seat part 2 is as shown in FIGS. 1, 3, and 4. A link 71 fixed to the lower surface of the footrest 6, links 72 and 73 rotatably connected to both sides of the link 71, and links 72 and 73 connected to the other end of the link 72 and the middle of the link 73. One end of the link 74 is rotatably attached to a fixed plate 15 provided on the frame 1 by a shaft 31. The other end is connected to the other end of a drive link 75 fixed to a rotation shaft 76 rotatably supported by a mounting plate 16 erected from the frame 1 . The bent portion 77 at the center of the rotation shaft 76 is provided for escape from the gas spring 8 when the backrest 4 is tilted backwards, as shown by the chain line in FIG.

By rotating the operation lever 70 fixed to one end of the rotation shaft 76, the drive link 75
When rotated, the link 73 whose one end is connected to the drive link 75 moves while being regulated by the link 74 supported by the shaft 31. At this time, since the link 72 whose one end is connected to the link 74 rotates with a larger radius than the connection point between the link 74 and the link 73, both links 72, 73
The footrest 6 to which the link 71 connected to is fixed is changed from the state shown by the solid line in FIGS. 1 and 4 to
After passing through the state shown by the broken line in FIG. 4, it rotates to the state shown by the chain line, that is, the position where the upper surface is approximately parallel to and at approximately the same height as the upper surface of the seat portion 2. The position where the footrest 6 is pulled out is determined by the stopper 78 cut and raised on the drive link 75 and the link 73.
It is determined by the contact with a locking portion 79 provided at.

When the operating lever 70 is rotated in the opposite direction, the footrest 6 hangs down from the front end of the seat 2 and the frame 1 follows a trajectory opposite to that in the above case.
It returns to the state where it is in contact with the front of the

The footrest 6, which is rotated by the link mechanism 7 configured as described above, has a virtual rotational center in which the center of rotation is located above the front end of the seat 2, not on the shaft 31. As is clear from FIG. 1, since the position of the knee joint of the user sitting on the seat 2 almost coincides with this virtual rotation center point A, When the footrest 6 is rotated in and out, the contact point between the footrest 6 and the user's clothes does not shift, so the clothes are not pulled.

Further, the link 74 here is the same as that of the fixed plate 15.
A tension spring 32 is installed between the tension spring 32 and the link 74, and a line connecting the connection points of the tension spring 32 and the link 74 and the tension spring 32 and the fixing plate 15 to prevent rotation of the link 74 when the footrest 6 is moved in and out. For this, axis 3
Because it crosses 1, in other words,
Since the length of the above line is the longest in the middle of the rotation range of the link 74 between the retracted state and the pulled out state of the footrest 6, the tension spring 32 is The table 6 acts to maintain that state whether it is in the stored state or in the pulled out state.

When operating the operating lever 70 to rotate the footrest 6, when pulling out or retracting the footrest 6, there is resistance due to the tension spring 32 at the beginning, but the length of the above line is the longest. Since the biasing direction of the tension spring 32 becomes the same as the operating direction of the operating lever 70 at the time when the dead center is exceeded, the footrest 6 can be moved in and out with a good operating feeling. Although there is no member to fix the footrest 6 in the pulled out position, the position will not change even under a small load. And footrest 6
When the foot is pulled out and ready for use, the tension spring 32 is biased in the pull-out direction. This action absorbs the impact and prevents the chair from tipping forward due to the impact. In addition, when lowering the footrest 6 to store it, if the operating lever 70 is rotated within a certain range, the direction in which the tension spring 32 acts will be reversed and the footrest 6 will be rotated within a certain range. is pulled in the storing direction and is held in the stored state along the front edge of the frame 1, so that it will not wobble or move unnecessarily in the stored state. It will not get in the way of your feet.

[Effects of the Invention] As described above, in the present invention, the center of rotation of the footrest is set above the front end of the seat, and the footrest is rotated around the knee joint of the person sitting on the seat. Since the footrest can be rotated, when the footrest is rotated to put it in and take it out, the contact point between the footrest and the user's clothes will not shift, and the user's clothes will stay in place. Not only does it not cause any discomfort because it does not get pulled, but the tension spring provided in the link mechanism allows the footrest to be taken in and out easily and can be pulled out. Even if you forcefully place your feet on the footrest, the tension spring acts as a buffer and prevents the chair from tipping forward. It will be kept in the stored state and will not rattle underfoot and become a nuisance.

[Brief explanation of the drawing]

Fig. 1 is a side view of one embodiment of the present invention, Fig. 2 is an exploded perspective view of the same, Fig. 3 is an exploded perspective view of the link mechanism of the above, Fig. 4 is a schematic diagram of the operation of the above, and Fig. 5 is a side view of the same as above, Fig. 6 is a side view of the reclining lever and gas spring as above, Fig. 7a,
b is a front view and a side view of the same backrest, in which 1 is a frame, 2 is a seat, 6 is a footrest, 7 is a link mechanism, and A is a virtual rotation center point.

Claims (1)

[Claims] 1. In a chair with a footrest in which the footrest is rotatably arranged at the front end of the seat of the chair and the footrest can be taken in and out, the center of rotation of the footrest is positioned above the front end of the seat. The foot rest is supported by a link mechanism provided below the seat, and the link mechanism is configured to raise the foot rest and move it to a usable position when the foot rest rotates and rises. 1. A footrest chair comprising a tension spring having a reversing action and acting to lower the footrest and move it to a storage position when the footrest rotates downward.