JPH0120903Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention includes a bracket at the mid-height of a column that supports the top of a desk or table, and a pivoting support arm attached to the pivot axis of the bracket. It is possible to change between two positions: a storage position in which the seat body is attached to the free end of the seat body and the seat body is pulled under the top plate, and a usage position in which it is pulled out to the rear. This invention relates to a chair for a desk, table, etc. with a chair that is configured to bias the sitting body into a retracted position by the force of a spring that is set up or stretched. To improve a chair in which the biasing force of a spring is canceled by receiving the weight of a seated person when the seat body is used, thereby eliminating pressure in the storage direction.

[Prior art] A bracket is provided in the middle of a column that supports the top of a desk or table, a support arm is pivoted freely around the pivot shaft of the bracket, and a seat is attached to the free end of the bracket. For desks and tables with chairs that allow the seat to be stored below the top plate and pulled out rearward for use, for example, Japanese Utility Model Application Publication No. 135755/1983 and Japanese Patent Application Laid-open No. 1983-1989 This method has been proposed in Publication No. 150257, etc.

The former invention is the basic idea for desks and tables with chairs of this type in which the seat body is moved in and out by rotating the support arm, while the latter invention is a device that stores the seat body with the seat body aligned in one direction when the support arm rotates. In addition to eliminating the possibility of the backrest attached to the seat body sometimes colliding with the top plate, a spring is installed inside the support arm to bias it in the retracting direction, so that it is automatically retracted when the seat is removed. It is.

[Problems to be Solved by the Invention] The present invention relates to the improvement of the latter type of desk and table with an automatically retractable chair using spring bias.

In other words, a chair with an automatically retractable chair or table has a spring force acting on it at all times in order to return to its retracted position.In particular, when the seat is used while sitting, the seat body is pulled back and the spring force is at its highest. As a result, the seated person's body is always pushed forward, creating a feeling of pressure. Additionally, since the spring force is acting on the sitting body, when you change the direction of your hips to change your sitting posture, the sitting body moves on its own, making it impossible to change it to the desired position. .

In view of the above-mentioned conventional points, the present invention eliminates the spring force for automatically retracting the seat body when seated, eliminating the discomfort caused by retraction, and making it possible to use the chair in a stable state at a desk or table with a chair. We aim to provide the following.

[Means for solving the problem] The present invention was devised based on the above purpose,
The feature is that a bracket with two pivot shafts standing in front and back parallel to each other is provided midway along the height of the column that supports the top plate, and these two pivot shafts have a first and a second pivot shaft. The support arms are pivoted so that they can rotate freely, and two support shafts are vertically disposed on the lower surface of the seat body in front and back parallel to each other, and are mounted on the free ends of each of the support arms, and the support arms are rotated around the pivot shafts as fulcrums. By turning, the seat can be converted into two positions: a retracted position in which the seat body is pulled under the top board, and a usage position in which it is pulled out backwards, and a spring that is normally contracted or expanded allows the seat body to be placed in the retracted position. In a chair for a desk or table with a chair that is biased, the upper ends of the two pivot shafts of the bracket are held parallel and tilted backward, and the first pivot shaft is pivoted to both pivot shafts. This chair for a desk or table with a chair is characterized in that the free end of the second support arm is lowered as the free end of the second supporting arm is rotated from a storage position to a use position.

[Function] Due to the above-mentioned structure of the chair of the present invention, when not in use, the seat body is retracted under the top plate and automatically retracted by the bias of the compressed or expanded spring, and when in use, that is, when seated, it moves backward. As the seat is pulled out, the free end of the support arm is guided by the tilt of the pivot shaft, and the seat body sinks accordingly.The weight of the seated person is placed on this and maintains the sunken state, causing the seat to move forward. Movement, ie, turning due to extension or contraction of the spring, is automatically suppressed and the biasing force is eliminated.

As a result, the user can sit in a stable state without being pushed forward by the spring force when seated.

Hereinafter, this invention will be explained with reference to the illustrated embodiments, and its features will be explained in detail.

[Example] Figure 1 is a perspective view, Figure 2 is an enlarged plan view of main parts,
Fig. 3 is an enlarged sectional view taken along the line of Fig. 2, Fig. 4 is an exploded perspective view of the main parts, Fig. 5 is a side view in use, and Fig. 6 is a plan view of the main parts in use. It is a diagram.

In the drawing, 1 is a column that supports the top plate 2, 3 is a bracket provided halfway up the height of the column, 4a, 4
b is the two pivot shafts provided on the bracket, 5a,
5b are first and second support arms of the same length that are rotatably pivoted at one end to the pivot shaft and supported substantially horizontally;
Reference numeral 6 designates a seat body in which two support shafts 7a and 7b, which are vertically disposed on the lower surface, are mounted and supported by the respective free ends of the support arms 5a and 5b.

The bracket 3 is attached to the support by bending a steel plate into a U-shaped cross section, aligning two parallel pieces 3a and 3b vertically, and welding each edge to the middle of the support 1. 2 pieces 3a,
The pivot shafts 4a, 4b are supported by passing them through holes 8, 8 provided at intervals in the front and rear of the shaft 3b.

To explain this bracket 3 in more detail, notches 9 are provided at the edges of the upper and lower pieces 3a and 3b that are attached to the column 1, respectively. By fitting and welding the upper and lower pieces 3a and 3b from the opposite direction, the upper and lower pieces 3a and 3b are made to tilt downward toward the rear. This inclination causes the pivot shafts 4a, 4b, which are passed through the holes 8, 8, to incline rearward.

The pivot shafts 4a and 4b are the two pieces 3 of the bracket.
By passing through the holes 8, 8 provided at the same distance in front and back in a and 3b, it stands parallel to the front and back, and is supported in a state tilted backward from the position of the holes mentioned above. There is.

When passing this pivot shaft through the hole in the bracket, it passes through the cylindrical pivot parts 10 and 10 provided at one end of the two support arms 5a and 5b, and after penetrating the lower hole 8, the washer 11 is inserted. By fitting and tightening the nut 12, it can be fixed to the bracket, and this fixation allows the support arm to be assembled.

By the way, the two support arms 5a and 5b are made of metal with a U-shaped cross section and are held together with their opening edges facing each other. It has a built-in spring 13.

One end of the spring 13 is hooked to a locking piece 14 provided on the first support arm 5a, and the other end is hooked to a locking piece 15 provided on the second support arm 5b, so that the spring 13 is stretched between the two pieces, and is always kept in tension. The free end of the first support arm and the base end of the second support arm are pulled together, and both support arms 5a and 5b, which are aligned in front and back in parallel, are biased so that their free ends protrude forward. . In this embodiment, an abutment piece 16 is provided on the second support arm 5b so as to face the locking piece 14, and an abutment piece 17 is placed on the first support arm 5a so as to face the locking piece 15. As shown in FIG. 2, when the free ends of the support arms 5a and 5b pivot backwards or forwards, they collide with each other and stop pivoting beyond a certain range of rotation. be. Furthermore, a through hole 18 is provided in the locking piece 14 for hooking one end of the tensioned spring 13, and a tensioning bolt 19 is inserted into the locking piece 14, and the tensioning bolt 19 is inserted into this bolt.
The tension of the spring can be adjusted freely by twisting a nut 20 by hooking the end of the spring.

The two parallel support arms are provided with cylindrical bearings 21, 21 at each free end, and the support shafts 7a, 7b of the seat 6 are inserted through these bearings to support them. .

The support shafts 7a and 7b are attached to the bottom surface of the seat body 6 on the base plate 22.
The through ring is installed from above while inserting the washer 23 into the bearing parts 21, 21 arranged next to each other. 24 to secure it.

Note that the cylindrical pivot shafts 10 provided at both ends of the support arms 5a, 5b and the bearing portions 21 are parallel to each other, so that the support shafts 7a,
7b are both designed to be tilted backwards.

In the chair configured as described above, the free end of the support arm is always pulled forward by the contractile force of the spring 13 stretched between the support arms 5a and 5b, and the seat body 6 is attached to the top plate 2. It will be pulled downward and assume the retracted position.

In this state, when the seat body 6 is pulled out rearward to take a seat, the support arms 5a and 5b rotate while stretching the spring 13 while maintaining a parallel state around the pivot shafts 4a and 4b of the bracket as fulcrums. The sitting body will be sent out.

At this time, both support arms 5a and 5b turn approximately horizontally, but since the pivot shafts 4a and 4b, which serve as fulcrums, are tilted backwards, they gradually descend as they turn backwards, and the seat body It will reduce the height. Then, when the seat body 6 is pulled out to a position where the seat can be seated, the spring 1
The locking piece 15 that stopped the arm 3 and the abutment piece 17 provided on the first support arm 5a collide with each other to stop the rotation and prevent further rotation.

In this state, the seat body is in a state where the spring 13 is most extended and the restoring force is high.
Next, when the body weight is applied by sitting down, the lowered seat body is held in that position, and the restoring action of the spring that tries to return the support arm to the front is canceled by this load, and the seat body is pulled out. This will stabilize the seated position.

Then, when the seated person leaves the seat, the weight of the seated person is released, and as a result, the two support arms receive the contraction force of the extended spring and move forward while maintaining their free ends in parallel. It rotates, and the seat body 6 is pulled in and stored under the top plate.

When the support arms 5a and 5b rotate, the two support arms 5a and 5b always rotate in parallel, and the two support shafts 7a and 7a of the seat body are connected to the two pivot shafts 4a and 4b that serve as fulcrums.
Since the seats 7b are placed at the same distance, the seat 6 always moves back and forth while facing forward. As a result, even if the seat body is left unattended when leaving the seat, it will not rotate arbitrarily and cause the backrest portion to collide with the edge of the top plate. Of course, here, in order to prevent the backrest portion from moving forward until it collides with the top plate 2 during storage, the locking piece 14 and the abutting piece 16 are brought into contact with each other when the backrest portion returns to the home position to prevent the rotation of the support arms 5a and 5b. It is set to stop.

[Effects of the invention] As explained above with respect to the embodiments, according to the invention, the support arm that rotates around the pivot shaft of the bracket is set to rotate slightly backward and downward from the horizontal,
When the spring has the highest restoring force (in use), the seat is at its lowest position and is fixed in this position by the weight of the person seated.
The restoring force of the spring will not cause the seat to return, giving you an extremely stable seating feeling.Also, even if you move the sitting position while seated, the seat body will move on its own, making it less comfortable to sit on. This is extremely convenient as it does not make things worse.

Of course, it goes without saying that in the chair according to the present invention, when the seat is taken off, the seat body is released from the pressing down of the body weight, so that it automatically returns to the retracted position by the action of the spring.

In the embodiment, the spring 13 is expanded to bias it in the restoring direction, but the same effect can be obtained by compressing the spring and using its repulsive force as a biasing force. Also, regarding this spring, a metal support arm 5 is used.
Since it is stored between a and 5b and expands, contracts, and swings as it rotates, it is effective for noise prevention if it is wrapped through a buffer protection tube 25 as shown in the figure.

[Brief explanation of the drawing]

The drawing shows one embodiment of the present invention.
The figure is a perspective view of the main parts in use, Fig. 2 is an enlarged cross-sectional plan view of the main parts, Fig. 3 is an enlarged sectional view taken along the line of Fig. 2, Fig. 4 is an exploded perspective view of the main parts, and Fig. 5 is the use state. FIG. 6 is a side view of the main part in use. 1... Support, 2... Top plate, 3... Bracket,
4a, 4b... Pivot shaft, 5a, 5b... First and second support arms, 6... Seat body, 7a, 7b... Support shaft,
13...Spring.

Claims (1)

[Scope of utility model registration request] A bracket with two pivot shafts that stand parallel to each other is installed in the middle of the height of the column that supports the top plate, and the first and second support arms can be rotated freely on these two pivot shafts. Two support shafts are vertically mounted on the lower surface of the seat body in front and back parallel to each other, and are mounted on the free ends of each of the support arms, and the seat body is rotated by rotating the support arms about the pivot shafts While the seat can be converted into two positions: a storage position pulled in below the top board and a usage position pulled out backwards, the seat body is normally biased to the storage position by a spring that is contracted or expanded. In the chair at the desk or table with a chair, two of the brackets are
The book's pivot shafts are tilted backwards while keeping their upper ends parallel, and the free ends of the first and second support arms pivoted to both pivot shafts are pivoted from the storage position to the use position. A chair at a desk or table with a chair, characterized in that the chair is lowered together with the chair.