JPH0741397Y2 - Splashing mechanism - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial application] The present invention relates to a chair installed in a movie theater, a theater, etc., where the seat is rotated substantially from a seating position where the seat is substantially horizontal and the user can sit on the seat. Then, the present invention relates to a flip-up mechanism for automatically flipping up a seating portion to a storage position with its upper end facing upward.

[0002]

2. Description of the Related Art Conventionally, as a flip-up mechanism for automatically flipping up a seated portion of a chair, for example, the actual opening 54, 10
As disclosed in Japanese Patent Publication No. 0819, Japanese Utility Model Publication No. 52860 of Japanese Utility Model Publication No. 58, or Japanese Utility Model Publication No. 19030 of Japanese Utility Model Publication No. 19930, Japanese Patent Laid-Open Publication No. 1930/1982, a torsion spring is used as a biasing means forming the center of the flip-up mechanism.

In these prior art examples, the torsion spring is used because of chatter noise due to resonance of the spring which occurs when a coil spring is used, and friction between the shaft and the bearing which is generated in proportion to the strength of the biasing force at the time of splashing. This was to suppress the fricative noise.

[0004]

However, in the flip-up mechanism using the torsion spring as disclosed in the above-mentioned conventional example, one of the bent ends of the torsion spring is simply fixed to the seating portion which rotates around the support shaft. However, since the other is only fixed to a fixed part such as a support shaft or a frame, it is impossible to adjust the urging force of the flip-up mechanism to the seating part.

Therefore, in the conventional example, it is difficult to realize an appropriate biasing force by the flip-up mechanism according to individual differences of members such as friction between the shaft and the bearing and changes with time of the torsion spring. It was Further, in the conventional example, for example, in a chair installed in a place where quietness is required, the urging force of the splashing mechanism is reduced to maintain the minimum urging force necessary for the splashing, and at the same time, the generation of friction noise at the time of splashing occurs. For chairs that are installed in places where quietness is not required as much as possible, on the other hand, the urging force of the splashing mechanism to the seating part is increased so that the splashing can be done instantly even if some friction noise is generated at the time of splashing. It was not possible to provide a flip-up mechanism suitable for chairs with various required characteristics such as.

Therefore, in the present invention, the urging force of the splashing mechanism with respect to the seating portion can be adjusted, and the urging force can be adjusted according to individual differences of members or changes with time, or the urging force can be adjusted according to the installation location. The purpose of the present invention is to provide a flip-up mechanism that can cope with various characteristics required for a chair such as a chair.

[0007]

SUMMARY OF THE INVENTION The structure of the flip-up mechanism according to the present invention is composed of two frames standing on the floor, and both ends of each of the two frames which are arranged between the two frames. Each of which is provided on a chair having a fixed shaft fixed thereto and a seat portion pivotally supported by the fixed shaft and rotatable between a seated position and a retracted position, and the seat portion is stored from the seated position. A torsion spring for automatically springing up to a position, comprising a rod-shaped twisted portion that produces a reaction force against twisting, and a torsion spring that is bent at both ends of the twisted portion. A fixing portion that attaches one of the bent portions of the torsion spring so as not to rotate about the fixed axis; and a spring hook portion that is provided in the seating portion and that attaches the other of the bent portions of the torsion spring, Spring hooking portion, the axial regulating portion for immovable said torsion spring in the axial direction of the fixed shaft,
And a rotation restricting portion that causes the other of the bent portions of the torsion spring to interlock with the seating portion in the rotation direction around the fixed axis, and the plurality of rotation restricting portions are provided at different positions in the rotation direction. It is characterized by being.

[0008]

In the flip-up mechanism according to the present invention, the twisting amount of the torsion spring between the retracted position of the seat and the seated position is minimized at the retracted position so that the torsion spring has a minimum twist at the stowed position. One is attached to the fixed part and the other is attached to the spring hook.

When a force is applied to the seating portion to rotate the seating portion around the fixed shaft to the seating position, one of the bent portions of the torsion spring is fixed to the fixed shaft, while the other of the bent portions is spring-loaded. Since the rotation restricting portion rotates in conjunction with the seating portion, the twisted portion of the torsion spring gradually twists greatly as the seating portion approaches the seated position. Then, the reaction force against the twist is stored in the twist portion,
As a result, the urging force of the splashing mechanism that tries to rotate the seating portion to the retracted position also increases.

At the seated position where the urging force to the seated portion is maximum between the retracted position and the seated position, the force applied to the seated portion is removed, for example, by a person sitting on the seated portion raising his or her waist. Then, the seating portion automatically rotates from the seated position to the retracted position by the biasing force based on the torsion of the torsion spring.

In the present invention, since the plurality of rotation restricting portions of the spring hooking portion are provided at different positions in the rotating direction, by changing the position of the rotation restricting portion to which the other of the bent portions of the torsion spring is attached, Depending on the individual differences such as the bearing condition of each chair and the change over time of the torsion spring, adjust the torsion amount of the torsion spring when the seating part is in the seating position to move the seating part from the seated position to the retracted position. It is possible to adjust the urging force required to lift up.

Therefore, by adjusting such biasing force,
It is possible to set an appropriate urging force according to individual differences of members such as the degree of friction between the fixed shaft and the bearing, and changes with time of the torsion spring. Further, according to the present invention, by adjusting the urging force, it is possible to provide a flip-up mechanism suitable for a chair having various characteristics in accordance with various requests such as a request for silence and a request for being able to flip up instantly. .

[0013]

Embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments described in detail below, and includes all embodiments that can be conceived by those skilled in the art without departing from the gist of the present invention.

FIG. 2 shows an external view of a part of the chair 1 according to this embodiment, which is disassembled. The chair 1 includes two side walls 12 and 12 that are erected on the floor 10 at the installation location, and the side walls 12 and 12.
A backrest 14 sandwiched between 12 and fixed to a frame member (not shown), and fixed between the side walls 12 and 12 with the backrest 14 fixed between the side walls 12 and 12 via metal fittings 16. The shaft 18 and the bearing 20 on the fixed shaft 18
And a seating portion 22 and the like that is rotatably supported by a seat.

The metal fitting 16 is formed by bending the center of the plate material at a substantially right angle so that the vertical portion 16a, which is one bending surface, is perpendicular to the floor portion 10, and the horizontal portion 16 which is the other bending surface.
It is projectingly fixed to the side wall 12 so that b is horizontal to the floor 10 above the vertical portion 16a.

Then, resin stoppers 24 mounted so as to project from reinforcing metal fittings 23 for reinforcing the bearings 20 mounted on both sides of the seating portion 22,
At each of the stored position and the seated position of the seating portion 22, the rotation of the seating portion 22 is prevented by abutting on the vertical portion 16a and the horizontal portion 16b of the metal fitting 16, respectively.

Further, the fixed shaft 18 is fixed to the metal fitting 16 by a bolt 18a. FIG. 3 shows the entire flip-up mechanism 30 arranged in the seating portion 22 as viewed from the back surface 22a side of the seating portion 22, and FIG. 1 shows the exploded view of the flip-up mechanism 30. The flip-up mechanism 30 includes the fixed shaft 18
A rod-shaped twisted portion 32a disposed substantially in parallel with the bent portions 32b, 32c bent at both ends of the twisted portion 32a.
A torsion spring 32, a through hole 34 that radially penetrates the fixed shaft 18 for attaching the one bent portion 32b to the fixed shaft 18, and a seating portion 22 fixed for attaching the other bent portion 32c to the seating portion 22. Installed spring fitting 3
6 and an oil damper 38 which is arranged between the fixed shaft 18 and the seating portion 22 to reduce the rotation of the seating portion 22 due to the biasing force of the torsion spring 32.

The spring fitting 36 has a U-shaped cross section, and has a flat portion 36a formed flat to be fixedly mounted on the side portion of the seat portion 22, and is bent substantially vertically at both ends of the flat portion 36a. The upper end portion 36b and the lower end portion 36c are formed. The bent portion 32c is seated on the upper end portion 36b by engaging the tip of the bent portion 32c of the torsion spring 32.
In order to interlock with 2, the three axial cutouts 50a, 50b, 50c, which are cut out from the end of the upper end portion 36b toward the flat portion 36a in the axial direction of the fixed shaft 18, are provided side by side.

The lower end portion 36c is engaged with the base end of the bent portion 32c to prevent the seat portion 22 from moving in the axial direction of the fixed shaft 18, so that the axial cutout portion 50 is formed.
The rotation direction notch 52 which is notched from one end of the lower end portion 36c toward the other end opposite to the other in the direction of rotating a by 90 degrees.
Is provided.

The bent portion 32c of the torsion spring 32 is
Is bent in the same direction as the cutout direction of the rotation direction cutout 52 so as not to come off from the axial cutouts 50a to 50c. One bent portion 32b of the torsion spring 32
Is inserted into a through hole 34 formed in the fixed shaft 18, the base end of the other bent portion 32c is inserted into the rotational direction notch 52, and the tip of the bent portion 32c is further provided with three axial notches 50.
It is inserted in any of a to c.

Here, the through hole 34 is formed with respect to the fixed shaft 18 so that the torsion amount of the torsion spring 32 between the retracted position and the seated position where the bending portion 32c rotates together with the seated portion 22 is minimized at the retracted position. The position, the mounting position of the spring fitting 36 with respect to the seat 22 and the like are set.

Then, by changing the positions of the axial notches 50a to 50c into which the tips of the bent portions 32c are inserted, the torsion amount of the torsion spring 32 is adjusted and the flip-up mechanism 3
It is possible to adjust the urging force of the seat portion 22 of 0. That is, the position where the bent portion 32c is inserted is set to the seating portion 22.
Of the torsion spring 32 in the retracted position to increase the amount of twist of the torsion spring 32 in the retracted position, thereby changing the axial notch 50a close to the retracted position to the axial notch 50c closer to the seated position. The urging force of can be increased.

As is well known, the structure of the oil damper 38 is as follows.
A piston (not shown) attached to one end of the rod 38a is slidably arranged in a cylinder 38b filled with oil, and the viscosity of the oil prevents the piston from sliding in the cylinder 38b. Thus, the longitudinal reciprocating motion of the rod 38a with respect to the cylinder 38b is alleviated.

The other end 38c of the rod 38a has a fixed shaft 18
Is rotatably supported by a plate-like mounting member 54 formed so as to project from the fixed shaft 18 so as to be orthogonal to the axis of the. Further, the base end 38d of the cylinder 38b is attached to the seat 2
A shaft 56 formed perpendicularly to the side of the shaft 2 is swingably supported.

The oil damper 38 has a seat 22.
The oil damper 38 and the mounting bracket 54 in the storage position of
Are arranged so that the angle formed by and is substantially right angle. In the chair 1 configured as described above, as shown in FIG. 4 in which only the seating portion 22 is taken out, the seating portion 22 is normally moved to the retracted position by the biasing force of the torsion spring 32 that repels torsion as shown by the solid line. The stopper 24 is rotated and held in contact with the vertical portion 16 a of the metal fitting 16.

A force is applied to the upper end 22b of the seating portion 22 in such a storage position to rotate the seating portion 22 around the fixed shaft 18 so that the user can sit, that is, the seating portion 22.
The seating position (shown by the chain line in FIG. 4) in which the surface 22c of the sheet is horizontal is reached. Then, the stopper 24 comes into contact with the horizontal portion 16b of the metal fitting 16, the seat portion 22 stops, and the seat portion 22 cannot be rotated further downward.

While the seat 22 is thus rotated from the retracted position to the seated position, the torsion spring 32 has a bent portion 32b fixed to the fixed shaft 18 and a bent portion 32c that rotates together with the seat 22. The twisted portion 32a between them is gradually twisted greatly, and an urging force having a magnitude corresponding to the twisted amount is accumulated. Further, the oil damper 38 is in a stretched state when the seat 22 is in the storage position, and is in a contracted state when the seat 22 is in the seated position.

When the seating portion 22 is in the seated position where the seating portion 22 is stopped, when the force applied to the seating portion 22 is removed by, for example, an operation such as a user standing on the seating portion 22 standing up, the torsion spring 32 is removed. The seating portion 22 is automatically flipped up by the urging force stored in the seat 22 to rotate around the fixed shaft 18, and the stopper 24 comes into contact with the vertical portion 16a of the metal fitting 16 to stop at the storage position.

When the seat portion 22 springs up, the oil damper 38 functions to reduce the biasing force of the torsion spring 32. That is, as the seat portion 22 approaches the retracted position from the seated position, the biasing force of the torsion spring 32 becomes smaller, so that the cushioning function of the oil damper 38 relatively acts and the rotational speed of the seat portion 22 gradually becomes smaller. Go on.

In the chair 1 according to this embodiment described in detail above, three axial notches 50a to 50c are provided, and the position where the tip of the bent portion 32c of the torsion spring 32 is inserted can be selected. Adjust the twisted state of the torsion spring 32 at the storage position of the seating portion 22,
The biasing force of the flip-up mechanism 30 with respect to the seat 22 can be adjusted.

Therefore, in the chair 1, the biasing force of the flip-up mechanism 30 is adjusted to adjust the individual characteristics of each member, such as the friction between the bearing 20 and the fixed shaft 18, the change over time of the torsion spring 32, and the like. Accordingly, it is possible to set an appropriate degree of splashing of the seating portion 22.

Further, in the chair 1, by adjusting the biasing force of the splashing mechanism 30, it is possible to meet various recent demands for the chair, such as a demand for quietness and a demand for being able to instantly lift. In addition, while maintaining the urging force necessary for flipping up the seat portion 22, the fixed shaft 1
8 between the bearing 8 and the bearing 20, collision between the seat 22 and the backrest 14 at the time of splashing, or the stopper 24 and the metal fitting 1
The urging force of the flip-up mechanism 30 can be set so that an impact sound due to a collision with the vehicle 6 is not generated.

Further, in the chair 1, one bent portion 32b of the torsion spring 32 is inserted and fixed in the through hole 34 formed in the fixed shaft 18, and the base end of the other bent portion 32c is provided in the spring fitting 36. Since the base end is prevented from moving in the axial direction by being inserted into the rotation direction notch 52, the seating portion 22 to which the bent portion 32c is attached via the spring fitting 36 is prevented from moving in the axial direction. And the seating portion 22 moves horizontally so that the seating portion 22
A user sitting on the chair does not feel any discomfort.

Further, in the chair 1, by disposing the oil damper 38 between the seat 22 and the fixed shaft 18, the urging force when the seat 22 is flipped up by the flipping mechanism 30 is relaxed. Therefore, by inserting the tip of the bent portion 32c of the torsion spring 32 into the axial notch 50c on the side farther from the backrest 14 to increase the twist amount of the torsion spring 32 in the retracted position, the splashing mechanism 30 can be seated on the seat portion 22. Even if the urging force is set to be large, the urging force of the splashing mechanism 30 becomes smaller as the spring force approaches the retracted position during splashing, whereas the cushioning function of the oil damper 38 is relatively large. However, the rotational speed of the seating portion 22 gradually decreases, and it is possible to prevent noise such as impact noise due to the collision between the stopper 24 and the metal fitting 16 that occurs when the seating portion 22 reaches the storage position.

The spring hooking portion in the flip-up mechanism according to the present invention described in detail above is not limited to the shape like the spring hooking metal fitting 36 of this embodiment, and the torsion spring cannot move in the axial direction of the fixed shaft. Any shape may be used as long as it includes an axial direction restricting portion and a rotation restricting portion that causes the other bent portion of the torsion spring to interlock with the seating portion around the fixed axis.

For example, the upper end portion 36b of the spring fitting 36
And a plate-shaped member having only the flat portion 36a without the lower end portion 36c, a tubular member serving as an axial regulation portion and a rotation regulation portion,
By fixing the bent portion of the torsion spring in an insertable direction, the torsion spring cannot move in the axial direction of the fixed shaft, and the bent portion of the torsion spring inserted into the tubular member is seated around the fixed shaft. A structure in which they are interlocked with each other, and a plurality of such cylindrical members may be arranged side by side on a plate-like member to adjust the twist amount of the torsion spring.

As described above, in the chair 1 of this embodiment, the torsion spring 32 is provided by providing the three axial notches 50a to 50c.
By making it possible to select the position to insert the tip of the bent portion 32c, the twisting state of the torsion spring 32 at the retracted position of the seat 22 is adjusted by only changing the insertion position, and the biasing force of the flip-up mechanism 30 against the seat 22 is adjusted. The oil damper 38 is not an essential requirement of the present invention as it can be adjusted. However, even when various dampers that do not generate a loud noise during operation are used instead of the oil damper 38 in the present embodiment, the same effect as when the above oil damper 38 is used, that is, the seating portion 2 is used.
There is an effect that the rotational speed is gradually reduced as 2 approaches the storage position from the seated position to prevent generation of impact noise when the storage position is reached.

[Brief description of drawings]

FIG. 1 is an exploded view of a flip-up mechanism 30.

FIG. 2 is an external view in which a part of the chair 1 according to the present embodiment is disassembled.

FIG. 3 is an overall view of a flip-up mechanism 30.

FIG. 4 is a seating portion 22 that rotates from a storage position to a seating position.
FIG.

[Explanation of symbols]

1 ... Chair, 12 ... Side wall, 16 ... Metal fitting, 18 ... Fixed shaft, 20 ... Bearing, 22
… Seat, 23… Reinforcing metal fittings, 24… Stoppers,
30 ... splashing mechanism, 32 ... torsion spring,
32b, 32c ... Bent portion, 34 ... Through hole, 36 ... Spring fitting, 38 ... Oil damper, 50a, 50b, 50c ... Axial notch portion, 52
… Rotation direction notch, 54… Mounting bracket,

Claims (1)

[Scope of utility model registration request] 1. A pair of frames, which are erected on a floor, a fixed shaft which is interposed between the two frames and whose both ends are fixed to the two frames, respectively, and the fixed shaft. A flip-up mechanism provided on a chair having a seat portion pivotally supported and rotatable between a seated position and a retracted position, for automatically flipping up the seat portion from the seated position to the stowed position. A torsion spring having a bar-shaped twisted portion that generates a reaction force against twisting and two bent portions that are bent at both ends of the twisted portion, and one of the bent portions of the torsion spring is provided around the fixed axis. A fixed portion that is attached so as not to rotate, and a spring hook portion that is provided on the seating portion and that attaches the other of the bent portions of the torsion spring, the spring hook portion including the torsion spring of the fixed shaft. And a rotation restricting part for interlocking the other of the bent parts of the torsion spring with the seating part in a rotating direction around the fixed axis, and the rotation restricting part. The flip-up mechanism is characterized in that a plurality are provided at positions different in the rotating direction.