JPH11276284A - Panic preventing support device for chair tablet, and chair with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a panic preventing support device for a chair tablet, and a chair equipped with the same. SOLUTION: This chair 1 has armrests 5 and 6, and a tablet 29 which is attached on the armrests 5 and 6 rotatable in the range between the horizontal position when the tablet is used and the vertical position when the tablet is brought up. The tablet is further rotatable when it is in the vertical condition from the vertical position mentioned above when it is brought up to the vertical position when it is brought down and perpendicular to the bottom of the armrest. The tablet 29 is supported rotatable around a horizontal shaft parallel to the vertical center plane of the chair when the tablet is brought down and at the vertical position perpendicular to the bottom of the amrest, so that the tablet can be moved to such a slanting position that allows a number of chairs of the same type to be piled up on each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-panic support device for a chair tablet and a chair provided with the device.

[0002]

BACKGROUND OF THE INVENTION In a chair of the type comprising an armrest and a tablet rotatably mounted on an armrest between a horizontal position and a vertical position, the tablet is raised when in a vertical position. It is mounted so that it can be further rotated between the vertical position and the vertical position below the rest.

[0003]

It is an object of the present invention to provide a chair of the above type. That is, the tablet is movable between its rest position and its operating position in a simple and easy way. In particular, to ensure that the anti-panic safety feature is activated, only the force exerted by the person's body when the seated person stands up (eg in an emergency situation) without directly grasping the tablet As a result, it is quickly moved from the operating position to the rest position. Finally, tablets do not prevent many chairs of the same type from being stored on top of each other.

[0004]

In order to achieve this object, the present invention provides a chair of the above type characterized by the following. That is, the tablet described above has a horizontal axis parallel to the vertical center plane of the chair when it is in the vertical position below the rest, so that it can be moved to an inclined position where many chairs can be stacked on top of each other. It is supported in such a way that it can rotate around.

The present invention also provides a tablet support device essentially regarded as for mounting a tablet on a chair armrest, characterized in that it comprises: A fixed support member fixed to an armrest, a rotatable support rotatably mounted on the fixed support member about a first horizontal axis parallel to a symmetric vertical plane of the chair, and A tablet rotatably mounted on the rotatable support about a second axis perpendicular to the first axis and substantially perpendicular to the second axis; A first stop means for defining two end positions at which the body is rotatable with respect to the fixed member, said position being a horizontal state of use of the tablet and a raised substantially vertical state of the tablet; First stop means corresponding to each of the first and second stop means for defining two end positions for the tablet to rotate with respect to the rotatable support in a vertical state of the tablet, Said position, said lifting of the tablet Second stop means respectively corresponding to the vertical position of the tablet and the vertical position of the rest of the tablet, and the rest position when the tablet is in its vertical state, effectively inserted between the tablet and the rotatable support. A spring means that tends to bias the tablet towards the fork, and for preventing the tablet from rotating around the second axis against the action of said spring means when the tablet is in its horizontal position during use. Stopping means and third stopping means operating in the lower vertical rest position of the tablet to define a position inclined about the first axis, wherein the tablet is moved from the lower vertical position of the rest. Starting and moving there, said inclined position comprising third stopping means suitable for loading many chairs on top of each other.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS The invention is shown by way of non-limiting example in the accompanying drawings, in which: FIG.

FIG. 1 shows an embodiment of a chair according to the invention. However, it is clear that the tablet support device according to the invention applies to any chair structure.
Furthermore, as will be apparent, the following description relates to a chair in which the support device according to the invention is fixed to the armrest of the right hand of the chair. Obviously, a device made in exactly the same way and symmetrically to it as described herein, such as a mirror, is applicable to the armrest on the left hand of the chair. It is also clear that the device according to the invention can be applied to components of the chair structure other than armrests.

Returning to the embodiment shown in FIG.
Typically shows a chair, with a seat 2 supported by a base structure. In this case, the chair has two front legs 3 and 2
And four rear legs. The two armrests 5 are fixed to the base structure of the chair, each of which has a tubular structure including a horizontal part 5a to which the armrest member 6 is mounted. Also, in the case of the illustrated embodiment, each armrest member 6
Is the lifted end position that does not work (shown in Figure 1)
And rotatably mounted on each tubular support portion 5a between the lower position and the operative lower position. Then, each armrest member 6 rotates at an angle of about 90 degrees with respect to the first position.
In that position, the upper surface of each armrest member 6 is substantially horizontal. Details regarding how each armrest member 6 is supported on the respective support tubular portion 5a and the stop means capable of defining an inactive raised position and an active lower position of each armrest member 6 Nothing is shown here. Because they are made in any known manner and do not fall within the scope of the present invention. Moreover, as already mentioned above, it is clear that the tablet support device according to the invention applies to any chair structure and to any support structure (not necessarily armrests) forming part of this chair.

With particular reference to FIGS. 3 and 7, the tablet support device according to the present invention has a fixed support member 7 removably connected to the tubular structure of the armrest 5 of the right hand. In the case of the embodiment shown, the fixed support
Is constituted by a cylindrical pin with its axis 8 oriented in a direction parallel and horizontal to the vertical center plane of the chair 1 in an attached state. In the embodiment described here, the fixed support member 7 has a root portion 7a which fits into a support element 9 made of plastic material which is fastened by screws 10 to another element 11 made of plastic material. . Made of plastic material2
The two companion elements 9, 11 are armrests 5
The front portion of the tubular structure is clamped therebetween. There, the upper tubular part 5a defines an angle with respect to the lower inclined part 5b (FIGS. 12, 13).

As can be clearly seen in FIG. 7, the fixed support member constituted by the cylindrical pin 7 has a front end projecting outwardly from an element 9 of plastic material in which the pin 7 is fitted.

A fixed support member constituted by a pin 7 has a rotatable support 12 rotatably mounted about an axis 8. In the embodiment shown, the rotatable support 12 is constituted by a U-shaped bracket having a central plate 13 with two parallel arms 14, 15 (FIG. 3). The central plate 13 has a central round hole 16 in which a reduced diameter end 17a of a bush 17 rotatable about the pin 7 is engaged. The end 17a is mounted in the hole 16 as an obstacle, so that the bushing 16
Are rotatably connected to the rotatable support 12.

At the end of the pin 7 projecting beyond the plate 13, a peripheral track 20 extending by an angle of about 90 degrees
Is firmly connected. Its end is defined by two stop surfaces 21, 22 and cooperates with a cylindrical stud 23 projecting from the plate 13 to define the two end positions of the rotatable support 12. As shown below, it corresponds to the raised vertical position of the tablet and the operating horizontal position of the tablet.
As already indicated, the plate 19 is firmly connected to the pin 7. It has a central opening 23 with two parallel planes having a contour corresponding to the contour in the cross section of the end of the pin 7. It consists of two parallel planes 7a
Also have. On the opposite surface of the truck 20, the plate 19
Also have stop surfaces 24, 25 (FIG. 3). Its function will become apparent in the following. The plate 19 is, in the embodiment shown, further strengthened by a counter plate 26 made of a plastic material and has a substantially circular shape, except for the part corresponding to the track 20. The edge around plate 26 follows the contour of track 20.
The spring portion 26a further has a function as a pawl member. The spring portion 26a is suitable for the pin 23 to snap-fit when reaching the stop 21. Plate 26 has two studs 27 that engage corresponding holes 28 in plate 19 and are secured thereto in any known manner. Similarly,
The plate 19 is connected axially to the pins 7 in any known manner.

The chair according to the present invention comprises a flat tablet 29 (FIG. 1) having a substantially circular sector shape.
The chair has two arms 14, 15 on a rotatable support 12.
As above, it is mounted on a support 10 so as to be rotatable about an axis 30 perpendicular to the axis 8.
For this purpose, the tablet 20 has two front holes 3
Fixed to a plate 31 which is rigidly connected to a pin 32 which is rotatably mounted in 3,34. It is axis 30
Has a common axis that matches

In FIG. 7, one of the screws 35 (see FIGS. 12 and 13) for fixing the main body of the tablet 29 made of a plastic material to the metal plate 31 is shown.

The pin 32 is rotatable with the plate 31.
It has a non-circular cross-section with parallel planes 36, which are inserted between the twelve arms 14 and engage holes 37, 38 having a corresponding cross-section in each of the plate 31 and the washer 39 It has an end. Therefore, the tablet 29 is rotatably connected to the pin 32.

On the inside of the arm 15 of the rotatable support 12 is fixed a bush 40 made of a plastic material, which rotatably supports the pin 32, but avoids friction arising from metal-to-metal contact. For the surface of the pin 32 and the hole 34
You can leave a little play with the wall. The bush 40 has a slot 42 formed on the peripheral edge of the arm 15.
Is fixed to the arm 15 by the fitting engagement of the front teeth 41.

Thus, while the bush 40 is rigidly connected to the arm 15, the pin 32 is free to rotate therein. In the other arm 14 of the rotatable support 12, the hole 33
Engaged by a reduced diameter (FIG. 3) portion 43 of a bush 44 made of plastic material, including a cam plate 45, the function of which is clearly shown below. Bush44
Is rotatable freely in the hole 33 of the arm 14 and is rotatably connected to the pin 32.

The arm 14 has outwardly bent teeth 46. It cooperates with the two stop surfaces 47, 48 of the plate 31 to define two end positions of the tablet 29 around the axis 30. In particular, when the rotatable support 12 is in its position rotated about the axis 8 corresponding to the vertical state of the tablet 29 (as shown in FIG. 3), the tablet 2
9 and the plate 31 along it are rotatable between a raised vertical position (shown in FIG. 13) and a lower rest vertical position (shown in FIG. 13 as in FIG. 1). In this position, the teeth 46 are in contact with the respective stop surfaces 47, 48 (FIGS. 12, 13).

In the above-described vertical position of the tablet shown in FIGS. 3, 12, and 13, the tablet is mounted around a pin 32 and by a coil spring 49 having an end shank 51 inserted into a hole 52 in the bush 44. , The rest is biased towards the lower position. Bush44
Has three seats positioned at a 120 degree angle that are optionally used for the engagement of springs 49 to load it. The possibility of tilting the tablet 29 in its vertical position about the axis 30 is clearly shown in FIG. In this figure, the vertical position of the lower part of the rest of the tablet is indicated by a solid line, while the vertical position lifted is indicated by a dotted line. Rotating forward around axis 30 (ie, clockwise in FIG. 1) and counterclockwise (FIG. 2)
Starting from its rest position by Tablet 29
Can reach this position. Once the raised vertical state is achieved, the tablet is released freely, which returns to the rest lower vertical position by itself under the action of the return spring 49.

Alternatively, once the raised vertical position shown by the dashed line in FIG. 2 and shown in FIG. 13 is achieved, the tablet 29 rotates about the axis 30 under the action of the spring 49. To prevent this, tablets
By rotating all the components supported thereon about the pin 7 and the support 12, it is rotated about the axis 8, so that the flat edge 45 a of the cam plate 45 lies on the front plane of the plate 19. Engage with. The tablet can then be brought to its working horizontal position (as shown in FIGS. 6 and 14). Even if it is released, it will maintain this position defined by the engagement of stud 23 with stop surface 22 of plate 19. In this state, the two arms 14, 15 of the rotatable support 12 are arranged substantially horizontally, but in the vertical state of the tablet,
They are substantially vertical.

Conversely, if one starts with the tablet in a working horizontal position, the tablet will have all the supports 12
And the various components are lifted to rotate about axis 8 by rotating about pins 7 while supporting them on them. To release the flat edge 45a of the cam 45 from the front of the plate 19, as soon as the tablet reaches its vertical position, the spring 49
By turning it around the axis 30 in the opposite direction, the tablet is returned to the inoperative lower position, which in this situation is oriented substantially horizontally.

A further feature of the device according to the invention is that when the tablet 29 is in its lower vertical position, it can be rotated along the support 12 about the axis 8 of the pin 7. . However, in this situation, it does not rotate around axis 8 over the entire angle of about 90 degrees defined between the two stop surfaces 21, 22 cooperating with the stud 23. In fact, when the tablet 29 is in its rest position, a part 45b of the cam 45 having a constant radius is introduced into the gap between the two stop surfaces 24, 25 of the plate 19, so that the tablet 29 It can rotate in response to displacements between 4, 5 or between the positions shown in FIGS. These positions are determined by the cams for each of the two stop surfaces 24 and 25, as also shown in FIGS. 10 and 11, which show a cross section taken along line XX in FIG. 8 and line XI-XI in FIG. Is defined by the engagement of the portion 45b. In other words,
When the tablet is in its rest state, the stop means defining the tilting position, as shown in Figures 5 and 8, will allow many chairs of the same type to move each other without the tablets of the overlying chair interfering with each other. It is possible to stack on top of. FIG. 15 schematically illustrates this state.
There, the solid base shows the portion of the base structure of the chair and the structure of another chair placed thereon.

Alternatively, when the tablet 29 is brought to its raised vertical position shown in FIG.
The portion 45b of the cam 45 having a uniform radius is
It emerges from the gap between 4,25. As a result, said stopping means become unusable and the support 12
The only stop means operating to limit the rotation of the is the stop means constituted by the stud 23 and the two stop surfaces 21,22.

The operation of the above device is as follows.

When the tablet 29 is in its rest position shown in FIG. 1, it can be grasped and rotated upward and forward. This rotation with the support 12 oriented as shown in FIG. Tablet
29 rotates with the plate 31 and the pin 32 against the action of the spring 49. When the raised vertical position shown in FIG. 13 is achieved, the support 12 is pinned to the end position defined by the engagement of the stud 23 against the stop surface 22.
By rotating around 7, the tablet is lowered to a horizontal position. The tablet is horizontal and the two arms 14, 15 of the rotatable support 12 are substantially horizontal. In this state, the flat edge 45a of the cam 44 engages the front surface of the plate 19 so that the spring 49 prevents the tablet 29 from rotating about the axis 30.
The vertical force that the tablet experiences during use is
It is supported by a plate 19 through a stud 23. It is stably fixed to the pin 7 and stably fixed to the tubular structure of the armrest. If it is desired to return the tablet to its rest state, it is sufficient to lift the cam 45 until the flat edge 45a of the cam 45 reaches a vertical position emerging from engagement at the front of the plate 19. As a result, the spring 49 returns to the rest state.
You can apply power to the tablet freely. Since there is no holding of the tablet in its operating position except for gravity, the device also achieves a panic prevention safety feature.
Because when a seated person stands up, it is only as a result of the force exerted by that person's body,
This is because the tablet is brought upright without being directly grasped. As soon as the tablet is in the upright position, the spring 49 returns it to the rest lower position. In this state, the constant radius portion 45b of the cam 45
It is introduced into the gap between the two stop surfaces 24, 25. The constant radius portion 45b can be taken by the tablet 29, and FIG.
Acts as an end face limiting the two end positions shown in FIG. Due to the laterally and outwardly tilted position shown in FIG. 5, many chairs of the same type can be stacked on one another without the chair tablets being disturbed. The device is covered by a housing 100 made of a plastic material fixed to the arm 14 of the support 12.

Of course, while the principles of the invention may be the same, the details of the structure and embodiments may be varied widely, without departing from the scope of the invention, as illustrated by way of example only. .

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of a chair according to the invention, using a device according to the invention.

2 is an enlarged perspective view of the armrest of the right hand of the chair of FIG. 1 to which the tablet support device according to the present invention is fixed.

FIG. 3 is an exploded perspective view of the device of FIG. 2;

FIG. 4 is a schematic front view of the chair shown in FIG. 1 in a state in which the armrest of the right hand is standing, showing the tablet in a vertical position below the rest.

FIG. 5 is a schematic front view similar to FIG. 4, showing the tablet in an inclined state suitable for loading a chair.

FIG. 6 is a schematic front view similar to FIGS. 4 and 5, showing the tablet in the operating position indicated by the solid line and the tablet in its raised vertical position indicated by the dotted line.

FIG. 7 is an enlarged cross-sectional view taken along the line VII-VII of FIG. 1;

FIG. 8 is an enlarged view of some parts of the cross section of the device of FIG. 5;

FIG. 9 is a partially enlarged view similar to FIG. 8, showing the tablet in a vertical position below the rest.

FIG. 10 is a cross-sectional view taken along the line XX of FIG.

11 is a cross-sectional view taken along the line XI-XI of FIG.

FIG. 12 is a side view showing details of FIG. 2;

FIG. 13 is a side view corresponding to FIG. 12 with the tablet in a raised vertical position.

FIG. 14 is an enlarged view showing details of FIG. 6;

FIG. 15 is a schematic front view showing many chairs stacked on each other according to the present invention.

[Explanation of symbols]

 1 Chair 2 Seat 5, 6 Armrest 7 Pin (Fixed support member) 8 Axis 9, 11 Element 12 Support 14, 15 Arm 19 Plate 20 Track 21, 22, 24, 25 Stop surface 23 Stud 29 Tablet 44 Bush 45 Cam 46 Tooth 47, 48 Stop surface 49 Spring

Claims (7)

[Claims] 1. An armrest (5,6) and a tablet (29) rotatably mounted on the armrest (5,6) between a horizontal position in use and a raised vertical position, When the tablet (29) is in its vertical position,
Tiltable further rotatable between the raised vertical position and the lower rest vertical position, wherein many identical chairs can be stacked on top of each other when the tablet (29) is in the lower rest vertical position; The tablet (29) to reach the position
A chair supported rotatably about a horizontal axis (8) parallel to the vertical center plane of the chair (1). 2. The chair according to claim 1, wherein in the vertical position of the tablet (29), the tablet is biased by a spring means (49) toward a vertical position below the rest. 3. A fixed support member (7) which is to be fixed to an armrest (5, 6) and a first axis (8) which is horizontal and parallel to the symmetrical vertical plane of the chair (1). A rotatable support (12) rotatably mounted about the fixed support member (7) about the first axis (8) on the rotatable support (12); A tablet (29) mounted rotatably about a second axis (30) at right angles and perpendicular to said second axis (30), and a rotatable support (12) comprise a fixing member (7). ) To define two end positions corresponding to the horizontal position when using the tablet (29) and the raised and substantially vertical position of the tablet (29). 1 stop means (21,22,23) and the tablet (29) is suspended against the rotatable support (12). Rotating in the upright position, the tablet (29) with the raised vertical position of said tablet (29)
A second stop means (46, 47, 48) for defining two ends respectively corresponding to the lower vertical position of the rest of the tablet, between the tablet (29) and the rotatable support (12) A spring means (49) that is effectively inserted and tends to bias the tablet (29) towards its rest position when the tablet (29) is in a vertical position, and its horizontal position when the tablet (29) is in use When in the state,
In response to the action of the spring means (49), the tablet (29)
Means (45a, 19) for preventing rotation of the tablet (29) about the second axis (30);
The first to define the tilted position around the 1 axis (8)
3) Stop means (45b, 24, 25) and tablets (2
9) can be reached starting from the rest lower vertical position, said inclined position comprising third stopping means suitable for stacking many identical chairs on top of each other, A device for supporting the tablet (29) on the chair armrest (5, 6). 4. In order to prevent the tablet (29) from rotating around the second axis (30) by the action of the spring means (49), the stopping means comprises a tablet (29).
A plate (45) rotatable therewith and having a flat edge (45a) adapted to engage against a flat front surface of an element (19) rigidly connected to said fixed support member. 4. The device according to claim 3, wherein: 5. In order to limit the tilting position of the chair stackable tablet, the plate (45)
Only when the tablet is in the vertical position under its rest,
Two stop surfaces (2) rigidly connected to the fixed support (7)
Device according to claim 4, characterized in that it has a part (45b) suitable for cooperating with (4, 25). 6. The end surface (21, 22) mounted on a fixed support member (7) and cooperating with a stud (23) mounted on a rotatable support (12). And a plate (19) having a peripheral track (20) with the said plate (19) for defining an end position of rotation of the tablet between its rest position for stacking chairs and the inclined position. Device according to claim 5, characterized in that it comprises the stop surface (24, 25). 7. The center plate (13), wherein the rotatable support is constituted by a U-shaped bracket (12) and is rotatably mounted on a fixing pin (7) constituting the fixed support member. With two parallel arms (14,1
5) rotatably supports a pin (32) whose axis coincides with the second axis (30) and supports the tablet (29) at one end thereof; The plate (19), constituted by a coil spring (49) mounted around the pin (32) supporting the 29) and comprising the stop surface (21, 22, 24, 25),
Support (12) rotatable between two arms (14, 15)
Device according to claim 6, characterized in that it is fixed to one end of the support fixing pin (7) projecting beyond the central plate (13) of the device.