JP2022159794A - Seat part flip-up device - Google Patents

Abstract

To provide a new technology capable of easily performing adjustment of speed of rotating a chair's seat part from a seating position to a standing position.SOLUTION: A seat part flip-up device of a chair having a seat part configured to be capable of rotating around a predetermined rotation axis from a seating position to a standing position comprises a torsion spring, a rotary member, and an adjustment member. The torsion spring has a first end fixed to a seat part frame. The rotary member, to which a second end of the torsion spring is fixed, rotates and moves in a torsion direction of the torsion spring together with the second end. The adjustment member, which is held by a holding member that does not rotate together with the seat part, adjusts the rotary member's position. The seat part is made to rotate from the seating position to the standing position by elastic force caused by torsional deformation of the torsion spring. The second end's position in the torsion direction is changed by the adjustment of the rotary member's position by the adjustment member.SELECTED DRAWING: Figure 4

Description

The present disclosure relates to seat flip-up devices.

2. Description of the Related Art Theaters, halls, and the like are often equipped with chairs whose seat portions are rotatable from a standing position when not seated to a seated position when seated. In the chair, a technique is known in which the seat portion is automatically rotated from the sitting position to the standing position when the occupant leaves the seat to stand the chair.

Patent Literature 1 discloses a chair seat erecting device including a seat support shaft, a spring hooking member, and a coil spring. One end of the coil spring is hooked to a seat frame whose left and right portions are rotatably supported by a seat support shaft so that the seat of the chair can rotate between a sitting position and a standing position. . Further, the other end of the coil spring is hooked to a spring hooking member that positions a predetermined circumferential position with respect to a seat support shaft penetrating through the interior. In this chair seat erecting device, the spring hooking hole for hooking the other end of the coil spring is changed to any one of the spring hooking holes provided in the circumferential direction of the spring hooking member. By appropriately changing the elastic force of the seat, the speed at which the seat rises can be adjusted.

JP-A-11-290155

However, in the chair seat erecting device described above, since the position of the spring hooking hole in the spring hooking member is fixed, there is the problem that it is difficult to make fine adjustments in consideration of variations in elastic force due to individual differences in the coil springs. rice field.

An object of one aspect of the present disclosure is to provide a new technology that can easily adjust the speed at which the seat portion of a chair is rotated from the sitting position to the standing position.

One aspect of the present disclosure is a chair seat flip-up device configured so that a seat on which a user can sit can rotate about a predetermined rotation axis from a sitting position when the user is seated to a standing position when the user is not seated. A torsion spring, a rotating member, and an adjusting member. The torsion spring has a first end fixed to a seat frame of the seat. The rotating member is fixed at a second end opposite to the first end of the torsion spring and rotates together with the second end in the torsion direction of the torsion spring. The adjusting member is held by a holding member that does not rotate with the seat and adjusts the position of the rotating member. The seat portion rotates from the sitting position to the standing position by elastic force due to torsional deformation of the torsion spring. The position of the second end in the torsional direction changes as the position of the rotating member is adjusted by the adjusting member.

With such a configuration, in a state where the first end of the torsion spring is fixed to the seat frame, the position of the rotating member is adjusted by the adjusting member, so that the torsion spring rotates together with the rotating member in the torsion direction of the torsion spring. The second end rotates and changes its position in the torsional direction. Therefore, by adjusting the position of the rotating member using the adjusting member, the elastic force due to the torsional deformation of the torsion spring can be strengthened or weakened. Therefore, it is possible to easily adjust the speed at which the seat portion of the chair is rotated from the sitting position to the standing position using the adjusting member.

In one aspect of the present disclosure, the rotating member may have an abutment surface against which the adjustment member abuts. Further, the rotating member may rotate in the torsional direction together with the second end by moving the position of the contact surface with the displacement of the adjusting member. According to such a configuration, by displacing the adjusting member to move the position of the contact surface, it is possible to easily adjust the position of the rotating member in the torsional direction.

In one aspect of the present disclosure, the adjustment member may have a vertex that contacts the contact surface. The contact surface may have a curved shape such that at least a portion of the contact surface contacts the vertex vertically when the rotary member rotates in the torsional direction. According to such a configuration, force due to displacement of the adjustment member is likely to be applied to the contact surface. If the contact surface were planar, when the rotating member was rotated in the torsion direction of the torsion spring by the adjusting member, the contact surface would likely intersect with the apex at an angle. is difficult to contact vertically. On the other hand, when the contact surface has a curved shape as in one aspect of the present disclosure, the contact surface and the apex are likely to contact each other vertically, compared to the case where the contact surface is planar. , the force due to the displacement of the adjusting member is likely to be applied to the contact surface.

In one aspect of the present disclosure, the rotating member may be held by a holding member. The retaining member may have a mounting portion to which the adjustment member is mounted and a rotating surface to which the rotating member is rotatably mounted. According to such a configuration, since the adjusting member and the rotating member are held by the holding member, the rotating member and the adjusting member can be easily arranged in the seat flip-up device.

An aspect of the present disclosure may further include a rotation support. The rotating support rotatably supports the seat frame and does not rotate with the seat. The holding member may be cylindrical and may be passed through by the rotation support. The surface of rotation may be the outer peripheral surface of the holding member. The rotating member may be cylindrical, and the holding member may penetrate therethrough so as to surround the rotating surface from the outside. According to such a configuration, the seat flip-up device can be configured with a simple configuration by using the rotation support portion without providing other parts for fixing the holding member so as not to rotate together with the seat. can be done.

In one aspect of the present disclosure, the rotating member may have a mark indicating a guideline for adjusting the strength of the elastic force by the adjusting member. According to such a configuration, it is possible to easily adjust the strength of the elastic force due to the torsional deformation of the torsion spring based on the reference marks. Also, the strength of the elastic force due to the torsional deformation of the torsion spring can be visually confirmed.

It is a right side view of a seat. Fig. 3 is a front view of the seat in the upright position; It is an enlarged front view of a seat flip-up device. It is a figure which shows typically the enlarged right side of a seat flip-up apparatus. It is a perspective view of the holding member seen from the front left side. It is a right view of a holding member. It is a front view of a holding member. It is a bottom view of a holding member. It is a perspective view of the rotation member seen from the front left side. It is a right view of a rotation member. It is a front view of a rotation member. It is a bottom view of a rotation member. FIG. 10 is a schematic diagram showing the movement of the seat flip-up device in a right side view when the elastic force due to torsional deformation of the torsion spring is increased. FIG. 14 is a perspective view schematically showing the arrangement of a rotating member, a holding member and an adjusting member in FIG. 13; FIG. 10 is a schematic diagram showing the movement of the seat flip-up device in a right side view when weakening the elastic force due to torsional deformation of the torsion spring; FIG. 16 is a perspective view schematically showing the arrangement of a rotating member, a holding member and an adjusting member in FIG. 15;

Exemplary embodiments of the present disclosure are described below with reference to the drawings.
[1. Constitution]
[1-1. seat]
A seat portion 100 shown in FIGS. 1 and 2 is a portion of a chair configured so that a user can sit thereon. The seat portion 100 has a backrest 200 configured to support the back of the seated user when the user is not using the chair, that is, when the user is not seated, and a seating surface 101 of the seat portion 100. They are in a standing position, standing parallel to each other. Also, the seat 100 is in a seated position where the seat 100 is reclined so that the seating surface 101 of the seat 100 is substantially perpendicular to the backrest 200 when the user is using the chair, that is, when seated. That is, the seat portion 100 is configured to be rotatable about the rotation axis A between the standing position and the sitting position. In the following description, for convenience of explanation, the up-down direction and the front-rear direction are expressed based on the state in which the seat portion 100 is in the standing position. Also, the horizontal direction is based on the user sitting normally on the chair with the seat portion 100 in the sitting position.

The seat portion 100 includes a seat portion frame 11 , a seat plate 12 , a cushion portion 13 , and a seat portion flip-up device 300 having a rotation support portion 14 .
The seat frame 11 is a rectangular frame, and includes an upper plate 111 arranged above, a lower plate 112 arranged below, a left side plate 113 arranged on the left side, and a right side plate arranged on the right side. 114. When the seat portion 100 is in the seated position, the upper plate 111 is arranged forward and the lower plate 112 is arranged rearward.

The seat plate 12 is a substantially rectangular resin plate that covers the rear surface of the seat frame 11 so as to close it. The seat plate 12 may be symmetrically provided with a plurality of arc-shaped grooves that form a large number of concentric circles.

The cushion portion 13 is a cushion material that covers at least the rear surface of the seat plate 12 and the upper plate 111 of the seat frame 11 , and constitutes the seating surface 101 of the seat portion 100 . That is, when the seat portion 100 is in the sitting position, the seat plate 12 and the cushion portion 13 are arranged in that order on the upper surface of the seat portion frame 11 . Note that the seat portion 100 may be wrapped with a cloth or the like from above the cushion portion 13 . Moreover, the seat portion 100 may have a plate-like back cover that covers the front surface of the seat portion frame 11 so as to close it. That is, the back cover may be provided on the lower surface of the seat frame 11 when the seat 100 is in the seated position.
The seat flip-up device 300 is provided near the lower right side in the internal space formed by the seat frame 11 .

The rotation support portion 14 is a tubular pipe having a length, and has a rectangular cross-sectional shape perpendicular to the central axis of the rotation support portion 14 . The rotation support part 14 is fixed to a column (not shown) erected on both left and right sides of the seat part 100 so as not to rotate together with the seat part 100 . The rotation support part 14 is fixed to the above-described support so that the central axis of the rotation support part 14 is substantially parallel to the floor surface on which the chair having the seat part 100 is arranged. The supports may be legs of a chair provided with the seat portion 100, which are provided on both left and right sides of the seat portion 100, for example. The rotation support portion 14 passes through first through holes 115 shown in FIG. A frame 11 is rotatably supported. That is, the central axis of the rotation support portion 14 coincides with the rotation axis A along which the seat portion 100 rotates between the standing position and the sitting position. As shown in FIG. 2 , in this embodiment, shafts 141 are attached to both side ends of the rotation support 14 so that the rotation support 14 rotatably supports the seat frame 11 . Although detailed illustration is omitted, the shaft portion 141 is rotatable between a rectangular hole through which the rotation support portion 14 passes so as to be fixed to the rotation support portion 14 and a circular through hole of the seat portion frame 11 . a circular outer peripheral surface that is inserted into the As shown in FIG. 3 , a prevention plate 142 is provided outside the seat frame 11 to prevent the shaft 141 from completely penetrating the first through hole 115 of the seat frame 11 . may be provided. The prevention plate 142 is formed with a second through hole 143 having a portion whose inner diameter is smaller than the outer diameter of the outer peripheral surface of the shaft portion 141 . In the example shown in FIG. 3 , the outer peripheral surface of the shaft portion 141 is inserted into the first through hole 115 of the seat frame 11 by being inserted into the second through hole 143 of the prevention plate 142 .

[1-2. Seat flip-up device]
The seat flip-up device 300 shown in FIG. 3 is a device capable of automatically rotating the seat 100 from the sitting position toward the standing position when, for example, the occupant leaves the chair. The seat flip-up device 300 includes a torsion spring 3 , an adjusting member 4 , a holding member 5 , a rotating member 6 and a stopper 7 . In this embodiment, the shaft portion 141, the stopper 7, the torsion spring 3, and the rotating member 6 are arranged in that order from right to left in the portion of the rotation support portion 14 that crosses the inner space of the seat frame 11. The holding member 5 is externally inserted so as to overlap the torsion spring 3 and the rotating member 6 .

The stopper 7 is attached to the rotation support portion 14 so as to be arranged between the shaft portion 141 and the holding member 5 described later. The rotation support portion 14 penetrates the rectangular hole portion of the stopper 7 , and the stopper 7 is non-rotatably fixed to the rotation support portion 14 . The stopper 7 has, on the left side of the stopper 7, a projecting portion 71 that is inserted into a cylindrical portion of the torsion spring 3, which will be described later.

The torsion spring 3 is a torsion coil spring formed in a coil shape so as to have a cylindrical portion. As shown in FIGS. 3 and 4, the torsion spring 3 has a first end 31 fixed to the seat frame 11 and a second end 32 opposite the first end 31 to a rotating member 6 described later. fixed to Specifically, the first end portion 31 of the torsion spring 3 is fixed so as to be caught by a screw 8 fixed to the right side plate 114 of the seat frame 11 so as to penetrate from the outside to the inside. Also, the second end portion 32 of the torsion spring 3 is fixed so as to be hooked on the spring hook portion 63 of the rotating member 6 . Therefore, when the first end portion 31 of the torsion spring 3 is twisted in the first twisting direction θ1 shown in FIG. It is possible to release the elastic force F applied. The first twisting direction θ1 is the same direction as the direction in which the seat portion 100 rotates from the standing position toward the sitting position. In other words, the elastic force F is a force acting in a direction in which the seat portion 100 automatically rotates from the sitting position toward the standing position.

The adjusting member 4 is a screw held by a holding member 5, which will be described later. The adjustment member 4 is, for example, a hexagon set screw whose position is fixed by a double nut such as a hexagon nut and a square nut. Specifically, the adjusting member 4 is inserted into a fourth through-hole 571 of the mounting portion 57 of the holding member 5 and fixed in position by sandwiching the adjusting member 4 with double nuts in the vertical direction. It should be noted that the adjustment member 4 may be, for example, a set screw having a knob or screws of various shapes. Further, the fourth through hole 571 into which the adjusting member 4 is inserted may be threaded. In this case, fine adjustment of the position of the adjusting member 4 in the vertical direction can be easily performed. Even when the adjusting member 4 is inserted into the fourth through-hole 571 having a female screw, a nut or the like may be hung to prevent the adjusting member 4 from loosening.

The holding member 5 holds the adjusting member 4 and a later-described rotating member 6 and is configured to be inserted into a part of the cylindrical portion of the torsion spring 3 . The holding member 5 is a member made of resin that is fixed to the rotation support portion 14 so as not to rotate together with the seat portion 100 . As shown in FIGS. 5 to 8, the holding member 5 is formed in a substantially cylindrical shape. The holding member 5 has a first groove 53 , a positioning portion 54 , a convex portion 55 , a fixing portion 56 , a mounting portion 57 and a rotation surface 58 .

The first groove 53 is a groove extending from the first end 51 to the second end 52 of the holding member 5 . In this embodiment, the holding member 5 is fixed to the rotation support portion 14 so that the first end portion 51 is arranged on the left side and the second end portion 52 is arranged on the right side. Four first grooves 53 are provided on the inner peripheral surface of the holding member 5 . The four first grooves 53 are arranged so that the four corners of the rotation support portion 14 inserted therein are fitted. By fitting the four corners of the rotation support portion 14 into the four first grooves 53 respectively, the rotation of the holding member 5 with respect to the central axis of the rotation support portion 14 is suppressed. That is, the four first grooves 53 suppress the rotation of the holding member 5 with respect to the rotation support portion 14 in the first twisting direction θ1 shown in FIG. 4 and the second twisting direction θ2 opposite thereto.

The positioning portion 54 is provided near the first end portion 51 of the holding member 5 . The positioning portion 54 is a portion annularly protruding from the outer peripheral surface of the holding member 5 .
The convex portion 55 protrudes from the outer peripheral surface of the holding member 5 . The convex portion 55 is provided closer to the second end portion 52 than the positioning portion 54 on the outer peripheral surface of the holding member 5 . Two protrusions 55 are provided on the outer peripheral surface of the holding member 5 . The two convex portions 55 are arranged at positions facing each other. In addition, in the present embodiment, the holding member 5 is fixed to the rotation support portion 14 so that the two protrusions 55 are arranged above and below the holding member 5 .

The fixing portion 56 is provided closer to the first end portion 51 than the positioning portion 54 on the outer peripheral surface of the holding member 5 . Note that, in the present embodiment, the fixing portion 56 is arranged in front of the holding member 5 . The fixing portion 56 has a third through hole 561 penetrating from the outer peripheral surface to the inner peripheral surface of the holding member 5 . By inserting the screw 9 shown in FIG. Movement along the axis is suppressed.

The attachment portion 57 is provided closer to the second end portion 52 than the positioning portion 54 on the outer peripheral surface of the holding member 5 . In addition, in the present embodiment, the attachment portion 57 is a portion that protrudes forward from the holding member 5 . The attachment portion 57 has a U shape when viewed from the front. The mounting portion 57 has a fourth through hole 571 and a second groove 572 . The fourth through-hole 571 is a hole vertically penetrating a protruding wall of the mounting portion 57 that extends forward and in the left-right direction. The second groove 572 is a groove that extends upward from the above-described projecting wall in which the fourth through hole 571 is provided, and is provided on the outer peripheral surface of the holding member 5 . The adjustment member 4 described above is attached to the attachment portion 57 by being inserted into the fourth through hole 571 . The adjustment member 4 is attached to the attachment portion 57 along the second groove 572 such that its position can be displaced in the vertical direction.

The rotation surface 58 is a surface of the outer peripheral surface of the holding member 5 closer to the second end portion 52 than the positioning portion 54 is. As shown in FIGS. 7 and 8 , the outer diameter of the holding member 5 decreases from the positioning portion 54 toward the second end portion 52 . That is, the rotation surface 58 has an inclination that approaches the central axis of the holding member 5 from the first end portion 51 side toward the second end portion 52 side. The two convex portions 55 described above are arranged on the surface of rotation 58 . As shown in FIG. 3 , a portion of the cylindrical portion of the torsion spring 3 described above is externally inserted on the second end portion 52 side of the convex portion 55 on the rotation surface 58 , and the first portion A rotating member 6, which will be described later, is rotatably fixed to the end portion 51 side.

The rotating member 6 is a member made of resin that can rotate together with the second end portion 32 of the torsion spring 3 about the first twisting direction θ1 and the second twisting direction θ2 shown in FIG. In the following description, when it is not necessary to specify the rotation directions of the first twist direction θ1 and the second twist direction θ2, they are simply referred to as twist directions. The rotating member 6 is formed in a substantially cylindrical shape. As shown in FIG. 3 , the rotating member 6 is rotatably mounted on the rotating surface 58 of the holding member 5 . In other words, the rotating member 6 is penetrated by the holding member 5 so as to cover the rotating surface 58 from the outside. A first end portion 61 of the rotating member 6 contacts the positioning portion 54 of the holding member 5 . At the first end 61 side of the rotating member 6, when the rotating member 6 is attached to the holding member 5, the first end 61 can contact the positioning portion 54 so as not to interfere with the mounting portion 57. A notch 611 is formed. The rotating member 6 is attached to the holding member 5 so that the attaching portion 57 of the holding member 5 is inserted into the notch portion 611 of the rotating member 6 .

As shown in FIGS. 9 to 12, the rotating member 6 has a spring hook portion 63, a contact portion 64, a third groove 65, and a fourth groove 66. As shown in FIG.
The spring hooking portion 63 is a portion protruding to the outside of the rotating member 6 so as to be folded back along the curve of the cylindrical shape. The spring hooking portion 63 has a hooking groove 631 and a folded portion 632 . The hooking groove 631 is a groove extending from the second end portion 62 side of the rotating member 6 toward the first end portion 61 side. The second end portion 32 of the torsion spring 3 described above is fitted into the hooking groove 631 so as to be hooked thereon. The folded portion 632 is a plate-like portion extending along the outer periphery of the rotating member 6 to prevent the torsion spring 3 fitted in the hooking groove 631 from coming off the spring hooking portion 63 .

The contact portion 64 is a portion that protrudes outward from the cylindrical shape of the rotating member 6 . The contact portion 64 has a contact surface 641 with which the adjustment member 4 contacts. The contact surface 641 is a surface of the contact portion 64 facing the adjusting member 4 and has a curved shape. Specifically, the contact surface 641 is configured so that when the rotating member 6 rotates in the second twisting direction θ2 shown in FIGS. 13 and 14 or in the first twisting direction θ1 shown in FIGS. It has a curved shape so that a part thereof is always in vertical contact with the apex portion 41 of the . The rotating member 6 is attached to the holding member 5 so that the contact surface 641 of the rotating member 6 is arranged above the attaching portion 57 of the holding member 5 .

Returning from FIG. 9 to FIG. 12, the third groove 65 is a groove that extends from the first end 61 of the rotating member 6 to the second end 62 . Two third grooves 65 are provided on the inner peripheral surface of the rotating member 6 so as to face each other.

The fourth groove 66 is a groove extending along the circumferential direction of the rotating member 6 so as to have a predetermined length. The fourth groove 66 is provided so as to be continuous with the third groove 65 on the second end portion 62 side of the rotating member 6 . Two fourth grooves 66 are provided on the inner peripheral surface of the rotating member 6 so as to face each other. When the holding member 5 is passed through the inside of the rotating member 6 , the projection 55 of the holding member 5 is fitted in the third groove 65 and then moved along the third groove 65 . Then, when the convex portion 55 of the holding member 5 reaches the fourth groove 66 , the rotating member 6 is rotated so that the convex portion 55 moves along the fourth groove 66 . The horizontal position of is fixed.

On the outer peripheral surface of the rotating member 6, marks written together with numbers from "0" to "5" are provided at predetermined intervals. The mark is a mark indicating a reference for adjusting the strength of the elastic force F of the torsion spring 3 by the adjusting member 4, as will be described later.

[1-3. Regarding the adjustment of the elastic force of the torsion spring in the seat flip-up device]
As shown in FIGS. 13 and 14, when the adjustment member 4 is moved upward, the contact surface 641 of the contact portion 64 of the rotary member 6 is pushed upward by the vertex portion 41 of the adjustment member 4, and the adjustment member 4 is pushed upward. , the position of the contact surface 641 of the rotating member 6 moves upward. When the position of the contact surface 641 moves upward in this manner, the rotating member 6 rotates on the rotating surface 58 of the holding member 5 in the second twisting direction θ2 about the rotating shaft A. As shown in FIG. As a result, the second end portion 32 of the torsion spring 3 fixed to the spring hooking portion 63 of the rotating member 6 also moves in the second twisting direction θ2. When the rotating member 6 rotates about the rotation axis A in the second torsion direction θ2 in this manner, the torsion angle of the torsion spring 3 increases. Become stronger.

15 and 16, when the adjusting member 4 is moved downward, the contact surface 641 of the contact portion 64 of the rotating member 6 moves downward while contacting the vertex portion 41 of the adjusting member 4. , the position of the contact surface 641 of the rotating member 6 moves downward as the adjusting member 4 is displaced. When the position of the contact surface 641 moves downward in this way, the rotating member 6 rotates on the rotating surface 58 of the holding member 5 in the first twisting direction θ1 about the rotating shaft A. As shown in FIG. As a result, the second end portion 32 of the torsion spring 3 fixed to the spring hook portion 63 of the rotating member 6 also moves in the first twist direction θ1. When the rotating member 6 rotates about the rotation axis A in the first torsion direction θ1 in this manner, the torsion angle of the torsion spring 3 decreases, so the torque of the torsion spring 3 decreases, and the elastic force F of the torsion spring 3 decreases. become weak.

In this embodiment, for example, by matching reference marks (not shown) marked on the holding member 5 with numerical marks "0" to "5" provided on the outer peripheral surface of the rotating member 6, the elastic force F can be used as a guideline. Specifically, when the adjusting member 4 is operated to rotate the rotating member 6 in the direction where the mark "5" matches the reference mark, the elastic force F of the torsion spring 3 increases. That is, in FIG. 14, when the adjusting member 4 is pushed in and the rotating member 6 is rotated so that the number mark moves to the back, the elastic force F of the torsion spring 3 increases. Further, when the adjusting member 4 is operated to rotate the rotating member 6 in the direction in which the mark "0" matches the reference mark, the elastic force F of the torsion spring 3 is weakened. That is, in FIG. 16, when the adjustment member 4 is released and the rotation member 6 is rotated so that the numerals move forward, the elastic force F of the torsion spring 3 is weakened.

[2. effect]
According to the embodiment detailed above, the following effects are obtained.
(2a) In this embodiment, the rotating member 6 is rotatably attached to the holding member 5, and the position of the rotating member 6, in other words, the rotation angle of the rotating member 6 can be adjusted as the adjusting member 4 is displaced. . As a result, with the first end 31 of the torsion spring 3 fixed to the seat frame 11, the second end 32 of the torsion spring 3 rotates together with the rotating member 6 in the torsion direction. As a result, the position of the second end 32 in the torsional direction changes. Therefore, by adjusting the position of the rotating member 6 with the adjusting member 4, the elastic force F caused by the torsional deformation of the torsion spring 3 can be strengthened or weakened. Therefore, the adjusting member 4 can be used to easily adjust the speed at which the seat portion 100 of the chair is rotated from the sitting position to the standing position.

In addition, the adjustment member 4 prevents the rotation member 6 from rotating in the direction opposite to the rotation of the seat portion 100 to the upright position due to the elastic force F of the torsion spring 3 . Therefore, the position of the rotating member 6 can be fixed by the adjustment member 4 coming into contact with the contact surface 641 .

Also, if the seat 100 has a heavy weight, such as when the back cover of the seat 100 is made of wood, the speed at which the seat 100 rotates from the sitting position to the standing position is slow. Prone. However, in the present embodiment, the speed can be adjusted to meet the specifications by adjusting the elastic force F of the torsion spring 3 by setting the adjusting member 4 to be strong. Also, for example, when a chair having the seat portion 100 is assembled, the speed at which the seat portion 100 is rotated from the sitting position to the standing position becomes uneven due to rattling on the floor surface or individual differences in component accuracy. , the adjustment member 4 allows fine adjustment.

(2b) In the present embodiment, the contact surface 641 of the rotating member 6 has a curved shape so that a part of the contact surface 641 is always in vertical contact with the apex portion 41 of the adjusting member 4 when the rotating member 6 rotates in the torsional direction. have Therefore, force due to displacement of the adjusting member 4 is likely to be applied to the contact surface 641 . On the other hand, when the contact surface is planar, when the rotating member 6 is rotated in the torsion direction by the adjusting member 4, the contact surface tends to intersect with the apex portion 41 obliquely. is difficult to contact vertically. For this reason, when the contact surface 641 has a curved shape as in the present embodiment, the contact surface 641 and the vertex 41 are likely to be in vertical contact at all times, compared to the case where the contact surface is planar. As a result, force due to displacement of the adjusting member 4 is likely to be applied to the contact surface 641 .

(2c) In this embodiment, since the adjusting member 4 and the rotating member 6 are held by the holding member 5, the rotating member 6 and the adjusting member 4 can be easily arranged in the seat flip-up device 300. FIG. It also has a function of fixing to the rotation support portion 14 so as not to rotate together with the seat portion 100, a function of holding the second end portion 32 of the torsion spring 3, and a function of adjusting the strength of the elastic force F of the torsion spring 3. It can be configured as a set.

(2d) In this embodiment, the holding member 5 is fixed without rotation to the rotation support portion 14 fixed to the support so as not to rotate together with the seat portion 100 . Therefore, by using the rotation support part 14, the seat flip-up device 300 can be configured with a simple structure without providing other parts for fixing the holding member 5 so as not to rotate together with the seat part 100. can.

(2e) In the present embodiment, the strength of the elastic force F due to the torsional deformation of the torsion spring 3 is determined based on the marks provided on the outer peripheral surface of the rotating member 6 together with the numbers "0" to "5". Adjustments can be made easily. Further, the strength of the elastic force F due to the torsional deformation of the torsion spring 3 can be visually confirmed by the mark.

[3. Other embodiments]
Although the embodiments of the present disclosure have been described above, it is needless to say that the present disclosure is not limited to the above embodiments and can take various forms.

(3a) In the above embodiment, the configuration in which the adjusting member 4 and the rotating member 6 are held by the holding member 5 was exemplified, but the configuration of the seat flip-up device 300 is not limited to this. For example, the seat flip-up device may be configured without the holding member 5 . In this case, for example, the rotation support 14 may hold the rotation member 6 directly or via another member so as to be rotatably movable together with the second end 32 of the torsion spring 3 . Further, for example, the rotation support portion 14 may have a configuration capable of directly holding the adjustment member 4 . Further, for example, the adjustment member 4 may be held by another member that does not rotate together with the seat portion 100 other than the rotation support portion 14 .

(3b) In the above embodiment, the rotating member 6 was formed in a cylindrical shape, but the shape of the rotating member is not limited to this. For example, the rotating member may be a plate-like member curved along the rotating surface 58 of the holding member 5 . In this case, for example, the rotating member may be rotatably held in a circumferentially extending groove or the like provided on the outer peripheral surface of the holding member.

(3c) In the above embodiment, the holding member is cylindrical, but the shape of the holding member is not limited to this. For example, the holding member may have various shapes such that the rotating member has a rotating surface on which it can rotate and has a configuration that can be fixed to the rotating support 14 .

(3d) Marks that are provided on the outer peripheral surface of the rotating member 6 and indicate a guideline for adjusting the strength of the elastic force F of the torsion spring 3 are marked with numbers less than or equal to "5" or numbers greater than or equal to "5." may be Also, for example, the mark may be written with characters such as "strong" and "weak" instead of numbers.

(3e) The function of one component in the above embodiments may be distributed as multiple components, or the functions of multiple components may be integrated into one component. Also, part of the configuration of the above embodiment may be omitted. Also, at least a part of the configuration of the above embodiment may be added, replaced, etc. with respect to the configuration of the other above embodiment. It should be noted that all aspects included in the technical idea specified by the wording in the claims are embodiments of the present disclosure.

3 Spring 4 Adjusting member 5 Holding member 6 Rotating member 7 Stopper 8, 9 Screw 11 Seat frame 12 Seat plate 13 Cushion 14 Rotation support , 31, 51, 61... First end 32, 52, 62... Second end 41... Vertex 53... First groove 54... Positioning part 55... Convex part 56... Fixing part 57 Mounting portion 58 Rotating surface 63 Spring hooking portion 64 Contacting portion 65 Third groove 66 Fourth groove 71 Protruding portion 100 Seat portion 101 Seating surface 111 Upper plate 112 Lower plate 113 Left plate 114 Right plate 115 First through hole 141 Shaft 142 Prevention plate 143 Second through hole 200 Backrest 300 Seat Flip-up device 561 Third through hole 571 Fourth through hole 572 Second groove 611 Notch 631 Hooking groove 632 Folding portion 641 Contact surface A Rotation shaft , F... elastic force.

Claims (6)

A chair seat flip-up device in which a seat on which a user can sit is rotatable about a predetermined rotation axis from a sitting position when the user is seated to a standing position when the user is not seated,
a torsion spring having a first end fixed to a seat frame of the seat;
a rotating member to which a second end opposite to the first end of the torsion spring is fixed and which rotates together with the second end in a torsion direction of the torsion spring;
an adjusting member held by a holding member that does not rotate together with the seat and adjusting the position of the rotating member;
with
The seat rotates from the sitting position to the standing position by an elastic force due to torsional deformation of the torsion spring,
The seat flip-up device, wherein the position of the second end in the torsion direction is changed by adjusting the position of the rotating member by the adjusting member. The seat flip-up device according to claim 1,
The rotating member has a contact surface with which the adjusting member abuts, and rotates together with the second end in the torsional direction by moving the position of the contact surface as the adjusting member is displaced. Seat flip-up device. The seat flip-up device according to claim 2,
The adjustment member has a vertex that contacts the contact surface,
The seat flip-up device, wherein the contact surface has a curved shape such that at least a part of the contact face vertically contacts the vertex when the rotating member rotates in the twisting direction. The seat flip-up device according to any one of claims 1 to 3,
The rotating member is held by the holding member,
The seat flip-up device, wherein the holding member has a mounting portion to which the adjusting member is mounted, and a rotating surface to which the rotating member is rotatably mounted. The seat flip-up device according to claim 4,
a rotation support that rotatably supports the seat frame and does not rotate together with the seat;
The holding member has a tubular shape, and the rotation support portion penetrates the holding member,
The rotating surface is an outer peripheral surface of the holding member,
The seat flip-up device, wherein the rotating member is cylindrical, and the holding member penetrates so as to surround the rotating surface from the outside. The seat flip-up device according to any one of claims 1 to 5,
The seat flip-up device, wherein the rotating member has a mark indicating a reference for adjusting the strength of the elastic force by the adjusting member.

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