Chair seat raising mechanism and chair

Abstract

To provide a chair seat raising mechanism for easily securing an aisle for people to pass through by pushing a raised seat further into a back side of a chair, and easily rotationally turning the seat to a sitting position by autonomously returning the pushed-in seat to the raised position.SOLUTION: A chair seat raising mechanism 10 for rotationally supporting a seat of a chair between a sitting position and a raised position and constantly energizing the seat toward the raised position, includes: two seat brackets for extending seat support shafts in a horizontal direction of the seat; two shaft support members 30 fixed to side members of the chair and respectively, rotationally supporting the seat support shafts of the two seat brackets; and a return member, when the seat and spiral springs for rotationally energizing the seat support shafts with first rotational energization force are pushed into a back side of the seat farther than the raised position in order to constantly energize the seat toward the raised position, applying second rotational energization force in an opposite direction of the first rotational energization force, to the seat support shafts such that the seat autonomously returns toward the raised position.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a seat raising mechanism for a chair and to a chair. [Background technology]

[0002] For example, in theaters, public halls, etc., the seats of the built-in chairs are supported by a seat raising mechanism so that they can swing between a substantially horizontal seated position and a substantially vertical standing position, for the purposes of facilitating the entrance and exit of spectators and hall users, etc., and ensuring an escape route in the event of a fire, etc. The seat raising mechanism generally constantly urges the seat toward the standing position, thereby raising the seat to the standing position when no one is seated, thereby ensuring a lateral passage between the seat and the chair in the previous row. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2007 / 099601 Summary of the Invention [Problem to be solved by the invention]

[0004] Although the seat raising mechanism constantly urges the seat towards the raised position to ensure an aisle between the chairs in the row ahead, it can be difficult to ensure a large enough aisle depending on the distance between the chairs, which can cause problems when other people try to pass through the aisle, especially when there is an occupied person.

[0005] That is, when a seated person notices another person trying to pass through the aisle, they will well-intentionedly stand up to secure a passage in front of them. However, the standing seat can become an obstacle and prevent the standing person from moving to the side of the chair seat, making it difficult to secure a sufficient passage, and other people may have difficulty passing.

[0006] The present invention relates to a chair seat raising mechanism and a chair that ensures a large space between the chair in front and makes it easier to ensure an aisle for people to pass through. [Means for solving the problem]

[0007] The seat raising mechanism for a chair of the present invention comprises: A chair seat standing mechanism that supports a chair seat so that the seat can rotate between a sitting position and a standing position and constantly biases the seat toward the standing position, Two seat brackets are fixed to the left and right sides of the seat, respectively, and each of the seat brackets supports a seat support shaft, and the seat support shaft is protruded to the left and right sides of the seat on the same central axis extending in the left and right direction of the seat; two shaft support members fixed to the side members of the chair so as to be located on the left and right sides of the seat, respectively, and rotatably supporting the seat support shafts of the two seat brackets; a spiral spring provided on at least one of the two shaft support members and configured to urge the seat support shaft to rotate with a first rotation urging force so as to constantly urge the seat toward the upright position; a return member provided on at least one of the two shaft support members, the return member applying a second rotational force to the seat support shaft in a direction opposite to the first rotational force when the seat is pushed further toward the back of the chair than the upright position, so that the seat autonomously returns to the upright position; Equipped with. Effect of the Invention

[0008] According to the present invention, the user can push the upright seat further toward the back of the chair, securing a large space between the seat and the chair in front, making it easier to secure an aisle for people to pass through. In addition, the return member autonomously returns the pushed-in seat toward the upright position, so the user can easily rotate the seat to the seated position. [Brief description of the drawings]

[0009] [Figure 1]FIG. 1 is a perspective view showing a chair and a seat raising mechanism for a chair according to an embodiment. [Diagram 2] FIG. 2 is a schematic diagram showing a state in which a seated person stands up to make way for others, where (A) shows a conventional seat and (B) shows a seat according to the embodiment. [Diagram 3] FIG. 3 is a front view of the left seat raising mechanism for a chair in a seated state according to the embodiment. FIG. [Figure 4] FIG. 4 is a front view of the right side seat raising mechanism for a chair in a seated position. [Diagram 5] FIG. 5 is a side view of the left seat raising mechanism for a chair in the raised position. [Figure 6] FIG. 6 is a side view of the shaft support member of the right-hand seat raising mechanism for a chair. [Figure 7] FIG. 7 is a side view of the right side seat raising mechanism for a chair in a seated position. [Figure 8] FIG. 8 is a side view of the right side seat standing mechanism for a chair in the standing position. [Figure 9] FIG. 9 is a side view of the right side seat raising mechanism for a chair during pushing. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, the embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed explanation than necessary may be omitted. For example, detailed explanation of already well-known matters or duplicate explanation of substantially the same configuration may be omitted. This is to avoid the following explanation becoming unnecessarily redundant and to facilitate understanding by those skilled in the art. Note that the attached drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

[0011] 1 is a perspective view showing a chair and a seat raising mechanism for a chair according to an embodiment. Chair 1 according to the embodiment includes a back 2, a seat 3, a side member 4, and a seat raising mechanism for a chair 10. Side member 4 includes armrests 5 and legs 6, with armrests 5 fixed onto legs 6, and back 2 fixedly supported between two side members 4. Furthermore, side member 4 rotatably supports seat 3 via chair seat raising mechanism 10.

[0012] Fig. 1 shows three chairs 1 lined up horizontally. The XYZ coordinate system in the figure is a coordinate system for clarifying the orientation of the chairs 1 and the seat rise mechanism for chairs 10, with the X axis corresponding to the left-right direction (horizontal direction) of the chair 1, the Y axis corresponding to the front-back direction of the chair 1, and the Z axis corresponding to the height direction of the chair 1. Furthermore, when referring to the left and right of the chair 1, the seat 3, the seat rise mechanism for chairs 10, etc., it means the left and right along the X axis direction as seen by a person sitting facing forward on the chair 1.

[0013] In, for example, theaters and public halls, the seat 3 of chair 1 is supported by a seat raising mechanism so that it can swing between a substantially horizontal seated position and a substantially vertical standing position, for the purposes of facilitating entry and exit for spectators and hall users, and ensuring an escape route in the event of a fire, etc. The seat raising mechanism generally constantly urges the seat 3 toward the standing position, thereby raising the seat 3 to the standing position when no one is seated, ensuring a lateral passage between the seat 3 and the chair in the previous row.

[0014] Although the seat raising mechanism constantly urges the seat 3 toward the raised position to ensure an aisle between the seat and the chair in the previous row, it may be difficult to ensure a sufficiently large aisle depending on the front-to-rear spacing of the chairs 1. Problems may arise when another person tries to pass through the aisle, especially when a seated person is present.

[0015] Figure 2 is a schematic diagram showing a situation where a seated person stands up to secure a passage for other people, and Figure 2(A) shows a conventional seat. As shown in Figure 2(A), when a seated person H1 notices another person H2 trying to pass through the passage, he or she stands up in good faith to secure a passage between him or her and the chair 1A in front of him or her. However, the standing seat 3 becomes an obstacle, preventing the standing person H1 from moving to the side of the chair back 2, making it difficult to secure a sufficient width of the passage, and the other person H2 may have difficulty passing.

[0016] On the other hand, Fig. 2(B) shows the seat of the embodiment. In the chair of this embodiment, as shown in Fig. 2(B), a person H1 who stands up can push the seat 3 toward the back 2, so that the seat 3 can be temporarily pushed into the pushed-in position. This ensures a wide space between the chair 1A in front, making it easier to ensure a passageway for person H2 to pass through.

[0017] As described later, the seat raising mechanism 10 for chair according to this embodiment can autonomously return the seat 3, which has been pushed in as shown in Fig. 2(B), to the raised position when the person H1 stops pushing it. Therefore, the seat 3 can be easily rotated to the seated position.

[0018] Fig. 3 is a front view of the left seat standing mechanism 10L for a chair in a seated state, which is a seat standing mechanism 10 for a chair according to the embodiment. Fig. 4 is a front view of the right seat standing mechanism 10R for a chair in a seated state, which is a seat standing mechanism 10 for a chair according to the embodiment. The seat standing mechanism 10 for a chair supports the seat 3 of the chair 1 so as to be rotatable between a seated position and a standing position, and constantly biases the seat 3 toward the standing position.

[0019] The seat raising mechanism for a chair 10 includes a seat raising mechanism for a chair 10L on the left side of Fig. 3 and a seat raising mechanism for a chair 10R on the left side of Fig. 4. The left seat raising mechanism for a chair 10L shown in Fig. 3 includes a seat bracket 20, a shaft support member 30, a spiral spring 40, and a return member 50. On the other hand, the right seat raising mechanism for a chair 10R shown in Fig. 4 includes a seat bracket 20, a shaft support member 30, a return member 50, and a rotary damper 60.

[0020] The seat bracket 20 in the left seat standing mechanism for a chair 10L is a member that is fixed to the left side of the underside of the seat 3, fixedly supports the seat support shaft 21, and causes the seat support shaft 21 to protrude to the left side of the seat 3. The seat bracket 20 in the right seat standing mechanism for a chair 10R is a member that is fixed to the right side of the underside of the seat 3, fixedly supports the seat support shaft 21, and causes the seat support shaft 21 to protrude to the right side of the seat 3. The seat support shafts 21 in the seat brackets 20 of the seat standing mechanism for a chair 10L and the seat standing mechanism for a chair 10R protrude on the same central axis C that extends in the left-right direction of the seat 3.

[0021] The seat bracket 20 has a lower plate 20a constituting the lower part of a single plate (e.g., a metal plate) bent into an L-shape, and a side plate 20b constituting the side of the single plate. The lower plate 20a has a plurality of screw holes 20c for fixing the seat bracket 20 to the underside of the seat 3 with screws 12 (see FIG. 1), and the side plate 20b supports and fixes, for example, by welding, a seat support shaft 21 that is inserted so as to protrude in the opposite direction to the lower plate 20a.

[0022] The shaft support member 30 in the left-side seat raising mechanism for a chair 10L is fixed to the side member 4 of the chair 1 so as to be located on the left side of the seat 3, and rotatably supports the seat support shaft 21 of the seat bracket 20. The shaft support member 30 in the right-side seat raising mechanism for a chair 10R is fixed to the side member 4 of the chair 1 so as to be located on the right side of the seat 3, and rotatably supports the seat support shaft 21 of the seat bracket 20.

[0023] 5 is a side view of the left seat raising mechanism for a chair 10L when the seat 3 is in an upright state. The shaft support member 30 is in the form of a substantially rectangular thick plate obtained by forming a metal plate, for example, and has a through hole 31 formed in the center thereof to allow the seat support shaft 21 of the seat bracket 20 to pass through. The shaft support member 30 has a plurality of screw holes 30e formed therein for fixing the seat support member 30 to the side member 4 with screws 13 (see FIG. 1). In addition, a spiral spring 40 is provided on the shaft support member 30 of the left seat raising mechanism for a chair 10L.

[0024] The seat support shaft 21 protruding from the seat bracket 20 is inserted into the through hole 31 of the shaft support member 30 from the rear side (the back side of the paper in FIG. 5) to form an assembly of the seat bracket 20 and the shaft support member 30. The shaft support member 30 has a concave accommodation portion 30b, and the spiral spring 40 is accommodated in the accommodation portion 30b.

[0025] The spiral spring 40 has an inner end 40a and an outer end 40b. In the housing portion 30b, the inner end 40a is fitted and engaged in one of the portions of the cross-shaped slit 21a formed at the tip of the seat support shaft 21, and the outer end 40b is fitted and engaged in a hook groove 30c formed on the periphery of the housing portion 30b. A plurality of hook grooves 30c are provided on the periphery of the housing portion 30b, and the biasing force of the spiral spring 40 can be changed by changing the hook groove 30c with which the outer end 40b is engaged.

[0026] The spiral spring 40 is pre-twisted to a certain degree before the rotation of the seat bracket 20 relative to the shaft support member 30 is restricted by the action of the stopper pin 23 (see FIG. 7) and the pin housing 32 as described below, and is preloaded so as to rotate the seat bracket 20 and the seat 3 to the standing position as shown by the arrow in FIG. 5. That is, the spiral spring 40 urges the seat support shaft 21 to rotate with a first rotational urging force so as to constantly urge the seat 3 toward the standing position. Since the first rotational urging force is sufficiently large, the seat 3 can be urged toward the standing position even if the seat 3 is thick and heavy from the viewpoint of improving seating comfort.

[0027] FIG. 6 is a side view of the shaft support member 30 of the seat standing mechanism for a chair on the right side 10R. In FIG. 6, the seat bracket 20, the rotary damper 60, and the return member 50 shown in FIG. 4 are not shown. The rotary damper 60 is provided in the accommodation portion 30b of the shaft support member 30 of the seat standing mechanism for a chair on the right side 10R where the spiral spring 40 is not provided (see FIG. 4), and has a configuration capable of generating a braking torque that reduces the first rotational biasing force of the spiral spring 40. The rotary damper 60 may be a general type, for example, a type filled with a viscous material, a type filled with gas, a type of friction disk, or the like. The rotary damper 60 reduces the first rotational biasing force of the spiral spring 40, so that the rotation of the seat from the seated position to the standing position can be made gentle. For example, it is possible to eliminate impact noise when getting up from a concert hall, etc., and to create a sense of luxury.

[0028] In this embodiment, two seat brackets 20 and two shaft support members 30 are provided corresponding to the left seat standing mechanism for a chair 10L and the right seat standing mechanism for a chair 10R, respectively, to support the seat 3. Meanwhile, the spiral spring 40 is provided only to the shaft support member 30 of the left seat standing mechanism for a chair 10L, and the rotary damper 60 is provided only to the shaft support member 30 of the right seat standing mechanism for a chair 10R. That is, the spiral spring 40 may be provided to one of the two shaft support members 30, and the rotary damper 60 may be provided to the other shaft support member 30. However, the spiral spring 40 must be provided to at least one of the two shaft support members 30.

[0029] 3, 4 and 6, the shaft support member 30 has a concave pin accommodating portion 32. The pin accommodating portion 32 is formed on the opposite side to the accommodating portion 30b, across a partition wall 33 (see FIGS. 3 and 4) formed in the approximate center in the thickness direction of the shaft support member 30. In FIG. 6, the accommodating portion 30b is formed on the rear side of the pin accommodating portion 32 in the drawing. The through hole 31 is provided by a boss portion 36 formed on the partition wall 33.

[0030] Furthermore, a spring accommodating portion 34 that accommodates a return spring 52 of a return member 50 (described later) is provided in the shaft support member 30 so as to be adjacent to the pin accommodating portion 32. The spring accommodating portion 34 accommodates most of the return member 50, but in particular mainly accommodates the return spring 52, and by being adjacent to the pin accommodating portion 32 in the main body of the shaft support member 30, the overall size of the shaft support member 30 is made compact.

[0031] 3 and 4, the return member 50 is provided on each of the two shaft support members 30. However, the return member 50 may be provided on only at least one of the two shaft support members 30.

[0032] 2(B), in the chair 1 of this embodiment, when a user, i.e., a seated person H1, notices another person H2, he or she can temporarily push the seat 3 into the pushed-in position by standing up and pushing the seat 3 toward the back 2. This ensures a wide space between the chair 1A in front, making it easier to ensure an aisle for the person H2 to pass through.

[0033] The return member 50 is a member that serves to impart a second rotational force, opposite to the first rotational force of the spiral spring 40, to the seat support shaft 21 of the seat bracket 20 so that the seat 3 returns autonomously to the upright position when pressed.

[0034] Fig. 7 is a side view of the right-side seat standing mechanism for a chair 10R in a seated state. Fig. 8 is a side view of the right-side seat standing mechanism for a chair 10R in a standing state. Fig. 9 is a side view of the right-side seat standing mechanism for a chair 10R when being pushed in. In Figs. 7 to 9, the seat bracket 20 is shown by a dashed line or a two-dot chain line to make the other members easier to see, but in reality, it is located in front of the shaft support member 30 on the paper. The configuration and operation of the return member 50 will be described below with reference to Figs. 7 to 9, but the same applies to the left-side seat standing mechanism for a chair 10L.

[0035] The return member 50 includes a push-in rotating member 51 and a return spring 52. The push-in rotating member 51 abuts against a part of the seat bracket 20 when the seat 3 is pushed in, and rotates in conjunction with the rotation of the seat support shaft 21. The return spring 52 is attached to the shaft support member 30 and the push-in rotating member 51, and generates a second rotational biasing force in the opposite direction to the first rotational biasing force of the spiral spring 40 by the rotation of the push-in rotating member 51.

[0036] The push-in rotation member 51 will be described in detail. The push-in rotation member 51 includes a rotation main body portion 54, a contact portion 55, and a spring attachment portion 56. In the embodiment, the push-in rotation member 51 is molded from a single resin member. However, the material and configuration of the push-in rotation member 51 are not particularly limited.

[0037] The rotating body 54 has a circular shape as a whole, and is rotatably attached to the periphery of the pin accommodating portion 32 of the shaft support member 30, specifically to the spring accommodating portion 34. The abutting portion 55 protrudes from the rotating body 54 toward the pin accommodating portion 32 in the radial direction of the rotating body 54, and abuts against a part of the seat 3, specifically the stopper pin 23, when the seat 3 is pressed in. The spring attachment portion 56 is a cylindrical member protruding from the rotating body 54 in the thickness direction (X-axis direction) of the shaft support member 30, and has the return spring 52 attached to its outer periphery, and is disposed around the cylindrical guide portion 35 (see FIGS. 3 and 4) provided to protrude into the spring accommodating portion 34. The cylindrical tip of the guide portion 35 is fitted into a fitting hole 54a formed in the center of the rotating body 54.

[0038] The return spring 52 is wound around the spring attachment portion 56, with one end 52a of the return spring 52 attached to the inner wall of the spring accommodating portion 34 of the shaft support member 30, and the other end 52b attached to the push-in rotating member 51. Furthermore, a mounting screw 57 passes through a through hole 35a of the guide portion 35 that guides the rotating main body portion 54, and screws into a nut 58. As a result, the push-in rotating member 51 is configured to be rotatably attached to the shaft support member 30, and to be applied with the second rotational biasing force of the return spring 52 when rotating.

[0039] The stopper pin 23 provided on the seat bracket 20 is provided around the seat support shaft 21 and protrudes to the left and right sides of the seat 3 together with the seat support shaft 21. The protruding stopper pin 23 is accommodated in a pin accommodating portion 32 of the shaft support member 30. The pin accommodating portion 32 is formed by two arc-shaped recesses around a through hole 31 that allows the seat support shaft 21 to pass through, and each of the two stopper pins 23 is accommodated in one of the two recesses. The pin accommodating portion 32 movably accommodates the stopper pin 23 and has an end portion 32a against which the stopper pin 23 abuts so as to stop the rotation of the seat support shaft 21 at the seating position of the seat 3, as shown in FIG. 7. Although not shown, a cushioning material may be wrapped around the stopper pin 23 .

[0040] The contact portion 55 of the push-in rotation member 51 is disposed in the pin accommodating portion 32, while the return spring 52, the rotation main body portion 54 and the spring attachment portion 56 of the push-in rotation member 51 are disposed in the spring accommodating portion .

[0041] When a user, a person H1 in FIG. 2(B), sits on the seat 3, the weight of the person H1 causes the seat 3 and the seat bracket 20 to rotate around the seat support shaft 21 against the first rotational biasing force of the spiral spring 40, and to be positioned at the seating position shown in FIG. 7. The two stopper pins 23 of the seat bracket 20 also slide and move in the pin housing 32 together with the rotation of the seat support shaft 21, but abut against one end 32a of the pin housing 32, thereby preventing the seat 3 and the seat bracket 20 from further rotating from the position shown in FIG. 7. In this state, the stopper pins 23 of the seat bracket 20 do not interfere with the abutment portion 55 of the push-in rotation member 51, and the push-in rotation member 51 is positioned in a neutral position and does not activate any function. The return spring 52 does not generate a biasing force.

[0042] When person H1 stands up, the weight of person H1 is lost, so that seat 3 and seat bracket 20 rotate around seat support shaft 21 due to the first rotational biasing force of spiral spring 40, and are positioned in the standing position shown in FIG. 8. Two stopper pins 23 of seat bracket 20 also slide and move within pin housing 32 together with the rotation of seat support shaft 21, and stop at approximately the center of pin housing 32. In this state, one stopper pin 23 only lightly abuts against abutment portion 55 of push-in rotating member 51, and push-in rotating member 51 is positioned in a neutral position and does not activate any function. Return spring 52 does not substantially generate a biasing force.

[0043] The pin housing 32 has one end 32a and the other end 32b on the opposite side, and in the process of transition from the seated position in Fig. 7 to the standing position in Fig. 8, the two stopper pins 23 move from the one end 32a toward the other end 32b, but do not abut against the other end 32b. Therefore, when the person H1 further pushes the seat toward the backrest 2 with his / her hands as shown in Fig. 2(B), the seat 3 and the seat bracket 20 rotate around the seat support shaft 21 and are positioned in the pushed-in position shown in Fig. 9.

[0044] In the push-in position, one of the stopper pins 23 abuts against the abutment portion 55 of the push-in rotation member 51, and then, by further moving the abutment portion 55, the push-in rotation member 51 rotates around the rotating main body portion 54 and the spring mounting portion 56 to the biased position shown in Figure 9.

[0045] 7 and 8, the push-in rotation member 51 is in a neutral position, and the return spring 52 does not generate a biasing force. When the push-in rotation member 51 is in the biased position of Fig. 9, an external force is applied to the return spring 52 by the stopper pin 23, and the return spring 52 generates a second rotational biasing force against the external force. This second rotational biasing force acts in the direction shown by the arrow in Fig. 9.

[0046] Therefore, when person H1 releases his / her hands from seat 3, seat 3 and seat bracket 20 rotate in the direction shown by the arrow in Fig. 9 due to the second rotational biasing force of return spring 52, and return to the standing position in Fig. 8. That is, even if person H1 temporarily moves seat 3 and seat bracket 20 to the pushed-in position in Fig. 9 by his / her hands, when person H1 releases his / her hands from seat 3, seat 3 and seat bracket 20 will autonomously return to the standing position in Fig. 8 due to the action of return member 50. Since seat 3 in this standing position protrudes diagonally and forward compared to when it is in the pushed-in position in Fig. 9, it becomes easier to rotate to the sitting position.

[0047] The chair seat raising mechanism 10 according to this embodiment allows the user to push the raised seat 3 further toward the back 2 of the chair 1, ensuring a wide space between the seat 3 and the chair 1A in front, making it easier to ensure an aisle for people to pass through. In addition, the return member 50 autonomously returns the pushed-in seat 3 toward the raised position, allowing the user to easily rotate the seat 3 to the seated position.

[0048] Moreover, the return member 50 has a push-in rotation member 51 and a return spring 52. This allows the return member 50 to generate a second rotational biasing force in conjunction with the rotation of the seat support shaft 21 when the seat 3 is pushed in.

[0049] Furthermore, the seat bracket 20 has a stopper pin 23 on a part thereof, and the shaft support member 30 is formed with a pin accommodating portion 32. This allows the push-in rotating member 51 to rotate with the simple configuration of the stopper pin 23 and the pin accommodating portion 32.

[0050] Further, the push-in rotation member 51 has a rotation main body portion 54, a contact portion 55, and a spring attachment portion 56. This allows the push-in rotation member 51 to be formed with a simple structure.

[0051] In addition, the abutment portion 55 is disposed in the pin accommodating portion 32, and the return spring 52, the rotating main body portion 54, and the spring mounting portion 56 are disposed in the spring accommodating portion 34. This allows the push-in rotating member 51 to be efficiently disposed in the limited space of the shaft support member 30.

[0052] Next, a more detailed description will be given of the return spring 52. As shown in the figure, the return spring 52 is configured as a so-called coil spring, with one axial end 52a of the coil spring attached to the inner wall of the spring accommodating portion 34 of the shaft support member 30 and the other end 52b attached to the push-in rotation member 51. This allows the return spring 52 to be configured as a general spring called a coil spring.

[0053] The coil spring constituting the return spring 52 is attached to the shaft support member 30 and the push-in rotation member 51 so that its axial direction is parallel to the seat support shaft 21. This allows the return spring 52 to be efficiently arranged in the limited space of the shaft support member 30.

[0054] In addition, the second rotational biasing force of the return spring 52 is set to be larger than the first rotational biasing force of the spiral spring 40. This allows the return member 50 to reliably return the pressed-in seat 3 from the pressed-in position to the upright position against the biasing force of the spiral spring 40.

[0055] In the embodiment, the return member 50 is provided on each of the two shaft support members 30. As a result, the two return members 50 can reliably return the pushed-in seat 3 to the upright position. In this case, the second rotational biasing force applied by the two return members 50 is set to be greater than the first rotational biasing force of the spiral spring 40. As a result, the two return members 50 can reliably return the pushed-in seat 3 from the pushed-in position to the upright position against the biasing force of the spiral spring 40.

[0056] As a result, the present disclosure includes at least the following items. Note that, in parentheses, the components corresponding to those in the above-described embodiment are shown, but the present disclosure is not limited to these.

[0057] (1) A chair seat standing mechanism (chair seat standing mechanism 10) that rotatably supports a seat (seat 3) of a chair (chair 1) between a sitting position and an upright position and constantly biases the seat toward the upright position, Two seat brackets (seat brackets 20) are fixed to the left and right sides of the seat, each of which supports a seat support shaft (seat support shaft 21) and projects the seat support shaft to the left and right sides of the seat on the same central axis extending in the left and right direction of the seat; Two shaft support members (shaft support members 30) are fixed to the side members (side members 4) of the chair so as to be located on the left and right sides of the seat, respectively, and rotatably support the seat support shafts of the two seat brackets, a spiral spring (spiral spring 40) provided on at least one of the two shaft support members and configured to urge the seat support shaft to rotate with a first rotation urging force so as to constantly urge the seat toward the upright position; A return member (return member 50) is provided on at least one of the two shaft support members, and applies a second rotational force to the seat support shaft in a direction opposite to the first rotational force when the seat is pushed further toward the back (back 2) of the chair from the upright position, so that the seat autonomously returns to the upright position. A seat raising mechanism for a chair.

[0058] This allows the user to push the upright seat further toward the back of the chair, ensuring a large space between the seat and the chair in front, making it easier to ensure an aisle for people to pass through. In addition, the return member autonomously returns the pushed-in seat toward the upright position, allowing the user to easily rotate the seat to the seated position.

[0059] (2) A seat raising mechanism for a chair according to (1), The returning member is a push-in rotating member (push-in rotating member 51) that rotates in conjunction with the rotation of the seat support shaft while contacting a part of the seat bracket when the seat is pushed in; a return spring (return spring 52) attached to the shaft support member and the push-in rotation member, which generates the second rotational biasing force by rotation of the push-in rotation member; 1. A seat rise mechanism for a chair comprising:

[0060] This allows the return member to generate the second rotational biasing force in conjunction with the rotation of the seat support shaft when the seat is pressed in.

[0061] (3) A seat raising mechanism for a chair according to (2), The seat bracket has a stopper pin (stopper pin 23) provided around the seat support shaft and protruding to the left and right sides of the seat together with the seat support shaft, The shaft support member is provided with a pin receiving portion (pin receiving portion 32) having an end portion against which the stopper pin abuts, the pin receiving portion receiving the stopper pin being movable around a through hole (through hole 31) that allows the seat support shaft to pass through, and the stopper pin is received in the pin receiving portion (pin receiving portion 32) so as to stop the rotation of the seat support shaft at the seating position of the seat. A part of the seat bracket is the stopper pin. Seat stand up mechanism for chairs.

[0062] This makes it possible to rotate the push-in rotation member with a simple structure of the stopper pin and the pin accommodating portion.

[0063] (4) A seat raising mechanism for a chair according to (3), The pushing and rotating member is a rotating body portion (rotating body portion 54) rotatably attached around the pin accommodating portion of the shaft support member; a contact portion (contact portion 55) that protrudes radially from the pivot body portion toward the pin accommodating portion and contacts the stopper pin when the seat is pressed in; A spring mounting portion (spring mounting portion 56) attached to the return spring. Seat stand up mechanism for chairs.

[0064] This allows the push-in rotation member to be formed with a simple structure.

[0065] (5) A seat raising mechanism for a chair according to (4), The abutment portion is disposed in the pin receiving portion, The return spring, the pivot body, and the spring mounting portion are disposed in a spring accommodating portion (spring accommodating portion 34) provided in the shaft support member so as to be adjacent to the pin accommodating portion. Seat stand up mechanism for chairs.

[0066] This allows the push-in rotation member to be efficiently arranged in the limited space of the shaft support member.

[0067] (6) A seat raising mechanism for a chair according to any one of (2) to (5), The return spring is a coil spring, and one axial end (one end 52a) of the coil spring is attached to the shaft support member, and the other end (the other end 52b) is attached to the push-in rotation member. Seat stand up mechanism for chairs.

[0068] This allows the return spring to be constructed of a general spring known as a coil spring.

[0069] (7) A seat raising mechanism for a chair according to (6), The coil spring is attached to the shaft support member and the push-in rotation member so that the axial direction is parallel to the seat support shaft. Seat stand up mechanism for chairs.

[0070] This allows the return spring to be efficiently arranged in the limited space of the shaft support member.

[0071] (8) A seat raising mechanism for a chair according to any one of (2) to (7), The second rotational force is greater than the first rotational force, Seat stand up mechanism for chairs.

[0072] This allows the return member to reliably return the pressed-in seat toward the upright position against the biasing force of the spiral spring.

[0073] (9) A seat raising mechanism for a chair according to any one of (1) to (7), The return member is provided on each of the two shaft support members. Seat stand up mechanism for chairs.

[0074] In this way, the seat that has been pushed in can be reliably returned to the upright position by using the two return members.

[0075] (10) A seat raising mechanism for a chair according to (9), The second rotational biasing force applied by the two return members is greater than the first rotational biasing force. Seat stand up mechanism for chairs.

[0076] This allows the two return members to reliably return the seat that has been pushed in toward the upright position against the biasing force of the spiral spring.

[0077] (11) A seat raising mechanism for a chair according to any one of (1) to (10), The spiral spring is provided on one of the two shaft support members, The rotary damper (rotary damper 60) is provided on the other of the two shaft support members and is capable of generating a damping torque that reduces the first rotational biasing force of the spiral spring. Seat stand up mechanism for chairs.

[0078] As a result, the rotary damper reduces the first rotational biasing force of the spiral spring, so that the rotation of the seat from the seated position to the standing position can be made gentle.

[0079] (12) A chair equipped with a seat raising mechanism for a chair described in any one of (1) to (11).

[0080] This allows the user to push the upright seat further toward the back of the chair, ensuring a large space between the seat and the chair in front, making it easier to ensure an aisle for people to pass through. In addition, the return member autonomously returns the pushed-in seat toward the upright position, allowing the user to easily rotate the seat to the seated position. [Explanation of symbols]

[0081] 1 Chair 2 tall 3 seats 4 Side members 5 Armrest 6 legs 10 Chair seat upright mechanism 20 Seat Bracket 21 Seat support shaft 23 Stopper pin 30 Shaft support member 31 Through hole 32 pin housing 32a end 34 Spring housing 40 Spiral Spring 50 Returning member 51 Push-in rotating member 52 Return spring 52a one end 52b other end 54 Rotating main body 55 Contact part 56 Spring mounting part 60 Rotary Damper

Claims

1. A chair seat standing mechanism that supports a chair seat so that the seat can rotate between a sitting position and a standing position and constantly biases the seat toward the standing position, Two seat brackets are fixed to the left and right sides of the seat, respectively, and each of the seat brackets supports a seat support shaft, and the seat support shaft is protruded to the left and right sides of the seat on the same central axis extending in the left and right direction of the seat; two shaft support members fixed to the side members of the chair so as to be located on the left and right sides of the seat, respectively, and rotatably supporting the seat support shafts of the two seat brackets; a spiral spring provided on at least one of the two shaft support members and configured to urge the seat support shaft to rotate with a first rotation urging force so as to constantly urge the seat toward the upright position; a return member provided on at least one of the two shaft support members, the return member applying a second rotational force to the seat support shaft in a direction opposite to the first rotational force when the seat is pushed further toward the back of the chair than the upright position, so that the seat returns autonomously to the upright position; A seat raising mechanism for a chair.

2. 2. A chair seat raising mechanism according to claim 1, The returning member is a push-in rotation member that rotates in conjunction with the rotation of the seat support shaft while contacting a portion of the seat bracket when the seat is pushed in; a return spring attached to the shaft support member and the push-in rotation member, the return spring generating the second rotational biasing force in response to rotation of the push-in rotation member; 1. A seat rise mechanism for a chair comprising:

3. 3. A chair seat raising mechanism according to claim 2, The seat bracket is provided around the seat support shaft and has a stopper pin that protrudes to the left and right sides of the seat together with the seat support shaft, The shaft support member is provided with a pin accommodating portion having an end portion against which the stopper pin abuts, the pin accommodating portion movably accommodating the stopper pin around a through hole that allows the seat support shaft to pass through, the pin accommodating portion having an end portion against which the stopper pin abuts, so as to stop the rotation of the seat support shaft at the seating position of the seat, A part of the seat bracket is the stopper pin. Seat stand up mechanism for chairs.

4. 4. A chair seat raising mechanism according to claim 3, The pushing and rotating member is a pivot body portion pivotably attached around the pin accommodating portion of the shaft support member; a contact portion that protrudes radially from the pivot body portion toward the pin accommodating portion and contacts the stopper pin when the seat is pressed in; A spring mounting portion attached to the return spring. Seat stand up mechanism for chairs.

5. 5. A chair seat raising mechanism according to claim 4, The abutment portion is disposed in the pin receiving portion, the return spring, the pivot body, and the spring attachment portion are disposed in a spring accommodating portion provided in the shaft support member so as to be adjacent to the pin accommodating portion; Seat stand up mechanism for chairs.

6. 3. A chair seat raising mechanism according to claim 2, The return spring is a coil spring, and one axial end of the coil spring is attached to the shaft support member and the other axial end is attached to the push-in rotation member. Seat stand up mechanism for chairs.

7. 7. A chair seat raising mechanism according to claim 6, The coil spring is attached to the shaft support member and the push-in rotation member so that the axial direction is parallel to the seat support shaft. Seat stand up mechanism for chairs.

8. 3. A chair seat raising mechanism according to claim 2, The second rotational biasing force is greater than the first rotational biasing force. Seat stand up mechanism for chairs.

9. 2. A chair seat raising mechanism according to claim 1, The return member is provided on each of the two shaft support members. Seat stand up mechanism for chairs.

10. 10. A seat raising mechanism for a chair according to claim 9, The second rotational biasing force applied by the two return members is greater than the first rotational biasing force. Seat stand up mechanism for chairs.

11. 2. A chair seat raising mechanism according to claim 1, The spiral spring is provided on one of the two shaft support members, a rotary damper provided on the other of the two shaft support members and capable of generating a braking torque for reducing the first rotational biasing force of the spiral spring; Seat stand up mechanism for chairs.

12. A chair comprising a seat raising mechanism for a chair according to any one of claims 1 to 11.

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