JP4570121B2 - seat - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to seats used in vehicles (buses, railway vehicles, airplanes, ships, etc.), theaters, movie theaters and the like.
[0002]
[Prior art and problems to be solved by the invention]
(1) In a seat where the backrest can be reclined, the comfort level and the fatigue level when sitting for a long time differ depending on the opening angle between the backrest and the seat after reclining. In the type where the angle of the seat does not change even if the backrest is reclined, the opening angle increases, so the sitting comfort changes greatly, the body tends to slip forward, and the degree of fatigue increases. is there. Accordingly, various types have been developed in which when the backrest is reclined, the seat tilts so that the rear part thereof is lowered so that the opening angle is not increased. The seat 51 shown in FIG. 9 includes a seat frame 52 whose rear side moves up and down with a seat frame base shaft 53 on the front side of the seat frame 52 as a fulcrum, and a backrest base shaft provided slightly forward from the rear end of the seat frame 52. A backrest frame 55 that rises and falls in the front-rear direction with a fulcrum 54 as a fulcrum is provided. The backrest frame 55 and the seat frame 52 are connected to each other by a linkage shaft 56 provided behind the backrest base shaft 54 so as to be rotatable. Therefore, when the backrest frame 55 is reclined, the rear side of the seat frame 52 is lowered. The backrest frame 55 is urged in a direction to return from reclining by a restoring mechanism such as a gas spring and returns to the original position (see, for example, Patent Document 1 and Patent Document 2).
[0003]
According to Patent Document 1 and Patent Document 2, the relative positional relationship in the front-rear direction of the seat frame base shaft 53, the backrest base shaft 54, and the cooperation shaft 56 can be read as described above. However, since the absolute position in the front-rear direction of each of the shafts 53, 54, and 56 is not described in the specification, the inventor must carry out an approximate position from the drawing. Even if it sees, since there are several factors of the absolute position and relative distance of each axis | shaft 53,54,56, and each factor influences each other, the pressing force when reclining the backrest and the urging force when returning In addition, it was found that it is very difficult to optimally set the degree of tilting of the seat frame.
[0004]
(2) Next, for the purpose of assisting the elasticity of the seat cushion in terms of sitting comfort, a plurality of springs (for example, refer to Patent Document 3) and a stretchable uniform elastic body (for example, a patent) There is known a seat in which an elastic auxiliary member such as a highly elastic rubber material (see, for example, Patent Document 5) that is integrally molded in a non-uniform manner is stretched and a seat cushion is installed thereon. Yes.
[0005]
However, these elastic auxiliary members have any of the problems that they are heavy, the mounting structure to the seat frame is complicated, and the cost is high, and there is no one that has solved all these problems. It was.
[0006]
(3) Next, many railcar seats are provided so that the seat can be rotated around a vertical axis and manually rotated in order to change the seat as the vehicle turns. (For example, refer to Patent Document 6). Some are rotated by a motor.
[0007]
In the case of manual rotation, it is necessary to rotate each vehicle separately, whether it is a one-seat seat or a two-seater seat. Because there are many, there was a problem that it took time and labor. In addition, when rotating by a motor, a large number of seats can be rotated simultaneously, but this requires complicated and expensive motor equipment.
[0008]
[Patent Document 1]
Japanese Utility Model Publication No. 24444 [Patent Document 2]
Japanese Utility Model Publication No. 5-46691 [Patent Document 3]
Japanese Utility Model Publication No. 2-124052 [Patent Document 4]
Japanese Utility Model Publication No. 5-72250 [Patent Document 5]
JP 2001-128783 A [Patent Document 6]
JP-A-6-40334 gazette
Therefore, the first object of the present invention is to not only keep the seat comfortably tilted when the backrest is reclined, but also the degree of seat tilt, the pressing force when reclining, and The object of the present invention is to provide a seat in which the urging force when returning is optimized.
An object of the following reference invention 2 is to provide a seat that can be made thin by realizing an elastic auxiliary member that is lightweight, has a simple mounting structure to a seat frame, and is low in cost.
An object of the following reference invention 3 is to provide a seat that can efficiently rotate a one-seat seat for changing the direction.
[0010]
[Means for Solving the Problems]
In order to solve the above problems, a seat according to the present invention has the following feature (1). The seats according to the reference inventions 2 and 3 have the following features (2) or (3).
(1) A seat that is optimally set for a seated person weighing 45 to 100 kg,
The distance range -10~50mm forward vertical line through the hip point of the occupant, the back those supporting shaft that reclinable supported the spine support frame in the longitudinal and vertical relative to the base frame provided so as not to be displaced An urging member with an urging force of 350 to 500N that urges the back frame in a direction to always return the reclining frame from reclining is provided so as to connect the rear end of the base frame and the substantially central portion of the back frame in the height direction. The seat support that pivots so that the rear portion of the seat frame can be tilted down and up in a distance range of 100 to 200 mm forward from a vertical line passing through the back support shaft and lower than the back support shaft. The shaft is provided so as not to be displaced back and forth and up and down with respect to the base frame, and the back frame is positioned at a position lower than the back support shaft and at a distance of 70 to 110 mm behind the vertical line passing through the back support shaft. The connecting point extending from the connecting frame is connected to the seat frame ,
Each distance range is the distance range when the backrest frame is in the upright return state before reclining the backrest frame, and the vertical line passing through the backrest support shaft and the seat support at this time and when the backrest frame is reclined. By keeping the distance to the axis from changing,
When a seated person reclines the backrest frame, it is easy to put the weight on the backrest and the backrest can be pressed with an appropriate pressing force, and the connecting point is pushed down by the connecting member in conjunction with the reclining of the backrest As for the seat frame which is lowered, the rear part descends with the moderate descending amount, but the front part does not rise as much as possible,
When the urging member returns the backrest frame from reclining by the urging force, the seat can be surely returned by an appropriate urging force that realizes an appropriate pressing force.
Here, each distance range indicated by a numerical value is a distance range when the upright return state is set before reclining the backrest frame.
[0011]
This seat is optimally set for a seated person having a standard weight of 60 kg and a weight of 45 to 100 kg. As shown in FIG. 1, the hip point of a seated person in this specification is based on a seated person with a standard weight of 60 kg, a point 80 mm above the seating surface in the vertical direction and 125 mm ahead of the backrest surface in the horizontal direction (seat left and right). Center of direction).
[0012]
The graph of FIG. 6 shows the relationship between the “sitting feeling” when the backrest frame 18 is reclined with respect to the distance L1 to the backrest support shaft 21 measured forward from the vertical line passing through the hip point of the seated person, The relationship of the “returning force” necessary for returning the backrest 5 by the urging force of the urging member 24 is shown. The seating feeling is evaluated in two stages, insufficient and good, and the restoring force is evaluated in three stages, insufficient, good and excessive.
Regarding the seating feeling, when the distance L1 is smaller than −20 mm (more than 20 mm backward from the vertical line passing through the hip point), the downward component of the vector to which the backrest frame 18 is directed when reclining the backrest is too small. Since the lowering amount of the rear part of the seat frame 19 becomes excessively small (in combination with L3 to be described later), the seated person is difficult to recline with the weight on the backrest, and the back and backrest The seating feeling is insufficient because a gap between the back and the seat is felt large. If the distance L1 is -20 to 80 mm, the downward component of the vector to which the backrest frame 18 is directed when the backrest is reclined becomes appropriate (along with the fact that L3 described later becomes appropriate). The lowering amount of the rear part of the frame 19 becomes moderate, so that the seated person can easily put the weight on the backrest and recline, and there is no difference between the backrest and the backrest, and the opening between the backrest and the seat is easy. The feeling of sitting is good because the corners do not feel large. When the distance L1 is larger than 80 mm, the downward component of the vector to which the backrest frame 18 is directed becomes excessive when reclining the backrest (in combination with the fact that L3 described later becomes excessive). The seating feeling becomes insufficient due to the excessive descending amount of the rear part.
Regarding the return force, if the distance L1 is less than −10 mm, the back support shaft 21 approaches the point where the biasing force acts on the back frame 18 even if the biasing force of the biasing member 24 is moderate. , Restoration power will be insufficient. If the distance L1 is −10 to 50 mm, the backrest support shaft 21 is appropriately separated from the point where the biasing force acts on the backrest frame 18 if the biasing force of the biasing member 24 is appropriate. Power is good. If the distance L1 is greater than 50 mm, the backrest support shaft 21 is too far away from the point where the biasing force acts on the backrest frame 18 even if the biasing force of the biasing member 24 is moderate, so that the restoring force is excessive. It becomes.
Thus, since the range both of L1 serving as good the seating feeling and the return force is -10～50Mm, in other words, spine rest support shaft distance range -10～50Mm vertical line that passes through the heat Ppupointo forward 21 will be provided.
[0013]
The graph of FIG. 7 shows that the front part rises as the rear part of the seat frame 19 descends with respect to the distance L2 from the vertical line passing through the back support spindle 21 to the seat support axis 22 measured forward. , And the relationship of “returning force” necessary for returning the backrest 5 by the urging force of the urging member 24. The front rise is evaluated in two stages, good and excessive, and the restoring force is evaluated in three stages, insufficient, good and excessive.
As for the front elevation, if the distance L2 is smaller than 80 mm, the seat support shaft 22 is separated from the front portion of the seat frame 19, so that the front elevation is excessive and the seated person's knees are lifted too much and the seating feeling is impaired. It is. If the distance L2 is 80 mm or more, the seat support shaft 22 comes closer to the front part of the seat frame 19, so that the front part does not rise so much, and the seating feeling is not impaired.
As for the return force, if the distance L2 is smaller than 80 mm, the seat support shaft 22 is too close to the connection point 27 of the connection member 20, and the biasing member 24 returns the backrest frame 18 together. Since the lifting force required to pull up the rear portion at the connecting point 27 becomes too small, the restoring force becomes excessive. When the distance L2 is 100 to 200 mm, the seat support shaft 22 is appropriately separated from the connection point 27, and the lifting force becomes appropriate, so that the restoring force is good. If the distance L2 is greater than 200 mm, the seat support shaft 22 is too far from the connecting point 27 and the pulling force becomes excessive, so that the restoring force becomes insufficient.
Therefore, the range of L2 in which both the front elevation and the return force are good is 100 to 200 mm. In other words, the seat support is in the distance range of 100 to 200 mm forward from the vertical line passing through the backrest support shaft 21. The shaft 22 is provided.
[0014]
The graph of FIG. 8 shows the relationship between the inclination angle “seat surface inclination angle” of the upper surface of the seat portion 4 and the distance L3 from the vertical line passing through the back support shaft 21 to the connection point 27 of the connection member 20 measured backward. Further, the relationship of “returning force” necessary for returning the backrest 5 by the urging force of the urging member 24 is shown. All of them are evaluated in three levels, deficient, good and excessive.
As for the seating surface inclination angle, if the distance L3 is smaller than 70 mm, the connecting point 27 is too close to the seat support shaft 22, so that even if the rear part of the seat frame 19 is pushed down at the connecting point 27, the seating surface inclination angle becomes insufficient. Since the opening angle increases, the seating feeling is impaired. If the distance L3 is 70 to 120 mm, preferably 90 to 120 mm, the connection point 27 is appropriately separated from the seat support shaft 22, so that when the rear portion of the seat frame 19 is pushed down at the connection point 27, the seat surface inclination angle is It becomes moderate and a good seating feeling is obtained. If the distance L3 is greater than 120 mm, the connecting point 27 is too far away from the seat support shaft 22. Therefore, if the rear portion of the seat frame 19 is pushed down at the connecting point 27, the seating surface inclination angle becomes excessive and the hip point sinks. Therefore, the seating feeling is impaired.
Regarding the return force, if the distance L3 is smaller than 50 mm, the pulling force required to pull up the rear portion of the seat frame 19 at the connecting point 27 when the biasing member 24 returns the back frame 18 is too small. Therefore, the restoring force becomes excessive. If the distance L3 is 50 to 110 mm, the pulling force becomes appropriate, so that the restoring force is good. If the distance L3 is greater than 110 mm, the pulling force becomes excessive, and the restoring force becomes insufficient.
Therefore, the range of L3 in which both the seating surface inclination angle and the restoring force are good is 70 to 110 mm, preferably 90 to 110 mm.
The connecting point 27 is provided in the distance range of 70 to 110 mm, preferably 90 to 110 mm, backward from the vertical line passing through the back support shaft 21.
[0015]
The “biasing member” is not particularly limited, and examples thereof include a hydraulic cylinder such as a hydraulic cylinder and an air cylinder. In the case of a fluid pressure cylinder, the urging force is not particularly limited, but it is possible to reduce the pressing force including the weight necessary for reclining the backrest, the appropriate return force, the availability and cost of the fluid pressure cylinder. In consideration, 350 to 500N is appropriate, and 380N to 460N is more appropriate. Further, the biasing force may be a constant characteristic at the initial stage of reclining and an end of reclining, or may be a characteristic that changes.
[0016]
(2) A seat in which an elastic auxiliary member formed by stretching an elastic net on a square annular rigid frame is attached to the seat frame, and a seat cushion made of an elastic porous body is installed on the elastic net.
[0017]
The “elastic net” is not particularly limited, and examples thereof include those obtained by knitting fiber linear bodies, for example, fiber linear bodies that are stacked vertically and horizontally and joined at contact points. The material of the linear body is not particularly limited, and examples thereof include polyester and tetron. The structure for attaching the elastic auxiliary member to the seat frame is not particularly limited, but one side of the rigid frame is engaged with one side of the seat frame by a fitting structure, and then the opposite side of the rigid frame is screwed to the opposite side of the seat frame. Thus, the structure attached to the seat frame can be exemplified.
[0018]
(3) Adjacent to multiple single-seat seats that can be rotated around the vertical axis to change direction and rotate any one-seat seat, the other single-seat seats rotate together. Thus, a seat provided with an interlocking mechanism for mechanically interlocking the rotation of the plurality of single seats.
[0019]
Although the interlocking mechanism is not particularly limited, a mechanism including a rotating body that rotates with the vertical axis of each single-seat seat and a transmission member such as a chain or a toothed belt hung between the rotating bodies can be exemplified.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment is shown based on a drawing as a form which materialized the present invention in a seat. In addition, the numerical value described in embodiment is an illustration and can be changed suitably.
[0021]
1 to 5 show a vehicle seat of a railway vehicle according to the present invention, and two single-seat seats 1 (width of about 640 mm, length of about 670 mm, and height of about 1150 mm) are supported on the leg 2. The base 3 is arranged in parallel with an interval of 750 mm to 850 mm. The one-seat seat 1 is supported by a seat portion 4 provided by installing a cushioning material, a backrest 5 supported so as to be able to recline about 17 ° with respect to the seat portion 4, and the seat portion 4, for example. A basic configuration including an armrest 6 is provided.
The one-seat seat 1 of this vehicle seat is provided with an interlocking mechanism that mechanically interlocks the rotation when the direction of the two one-seat seats 1 is changed in accordance with the change of the traveling direction of the vehicle. Yes. This is done by stepping on the pedal 7 provided on the leg 2 on the passage side, releasing the lock, and rotating the one-seat seat 1 on the passage side about the vertical axis at the approximate center of the own seat with respect to the base. In other words, the other one-seat seat 1 is interlocked and can rotate about the vertical axis at the center of the other one-seat seat 1 relative to the base 3.
The mechanism of this interlocking mechanism consists of a pair of gears 10 supported by the legs 2 by shafts (not shown) in the legs 2 and the base 3 directly under each one-seater seat 1 and the pair. A chain 11 that meshes with the other gear 10 and causes the pair of gears 10 to co-operate, a pair of sprockets 12 and 12 that prevent the chain 11 from being loosened, and a tension for applying tension to the chain 11. And a gear 13. The pair of gears 10 are configured to rotate together with the corresponding one-seat seat 1 via a rotating disk 14.
[0022]
An internal frame that supports the seat portion 4 and the backrest 5 of the one-seat seat 1 includes a base frame 17, a backrest frame 18, a seat frame 19, and a connecting member 20. In addition, a hip point 23 of a seated person (weight approximately 60 kg) is present at a point 80 mm above the seat part 4 in the vertical direction and 125 mm forward from the back surface in the horizontal direction in the single seat 1 that is not reclining. Yes.
[0023]
The base frame 17 is fixed to the rotating disk 14 at the top of the base 3 below the base frame 17, and transmits the rotation of the gear 10 to the one-seat seat 1. The plane shape of the base frame 17 is substantially square, and the side surface shape is substantially hemispherical. At the upper ends of both side surfaces, the backrest support shaft 21 is 9 forward from the vertical line passing through the hip point 23 of the seated person. The backrest frame 18 is provided so as to be reclinably supported at a distance of 1 mm (distance L1 in FIG. 1) and a distance of 115.0 mm below the horizontal line passing through the hip point 23 of the seated person. Further, the seat support shaft 22 at the front ends of the both side surfaces moves the seat frame 19 downward and upward to a distance of 130.0 mm (distance L2 in FIG. 1) forward from the vertical line passing through the backrest support shaft 21. It is provided so as to be pivotably supported.
The front shape of the backrest frame 18 is substantially rectangular, and the side shape is a substantially straight shape with the lower portion bent forward, and is pivotally attached to the backrest support shaft 21 at the front ends of both side surfaces of the backrest frame 18. Further, a biasing member 24 that constantly biases the back frame 18 in the direction of returning from the reclining is provided so as to connect the rear end of the base frame 17 and the substantially central portion of the back frame 18.
The planar shape of the seat frame 19 is substantially square, and the side shape is substantially linear with the rear portion slightly raised. A seat support shaft 22 is pivotally attached to a seat support shaft mounting portion 26 provided toward the lower side on the front side of both side surfaces of the seat frame 19. In addition, a connecting member 20 extending from a bent portion on both side surfaces of the backrest frame 18 is pivotally attached at a connecting point 27 to the connecting member mounting portion 28 provided upward from the rear ends of both side surfaces of the seat frame 19. Has been.
The connecting point 27 is provided at a distance of 92.2 mm (distance L3 in FIG. 1) rearward from the vertical line passing through the back support shaft 21 when not reclining.
[0024]
Since the backrest support shaft 21 is provided in front of the vertical line passing through the hip point 23, when the seated person reclines the backrest frame 18, it is easy to put weight on the backrest 5 and make the backrest 5 moderate. It can be pressed with a pressing force. In addition, the seat frame 19 in which the connecting point 27 is pushed down by the connecting member 20 in conjunction with the reclining that occurs with the backrest support shaft 21 of the backrest 5 is supported by the seat support shaft 22 as a rear portion. While it descends with a moderate amount of descent, the front is kept from rising as much as possible.
When the urging member 24 returns the backrest frame 18 from reclining by the urging force, the urging member 24 can be surely returned by an appropriate urging force that realizes an appropriate pressing force. In this embodiment, the biasing member 24 has a characteristic of 412N at the beginning of pressing and 441N at the maximum.
[0025]
In the single-seat seat 1 that is not reclining, the upper surface of the seat portion 4 is inclined upward by 8 ° with respect to the horizontal plane, and the substantially central portion of the front surface of the backrest 5 is rearward by 21 ° with respect to the vertical surface. It is the aspect which is inclined. When reclining back to the maximum of 17 °, the upper surface of the seat portion 4 is inclined upward by 15 ° with respect to the horizontal plane. Therefore, the front side of the upper surface of the seat portion 4 is raised by 7 ° and the rear side of the upper surface of the seat portion 4 is lowered from an aspect in which the reclining is not performed with the seat support shaft 22 as a fulcrum.
[0026]
Inside the seat portion 4, an elastic auxiliary member 31, in which an elastic mesh 30 that is resin-bonded so that the adhesive resin sufficiently enters the mesh over the entire circumference of the square annular rigid frame 32, is stretched, It is attached so as to be inscribed in the seat frame 19. A seat cushion 37 made of an elastic porous material and having a thickness of about 50 mm is installed on the elastic net 30. One surface of two hook-and-loop fasteners 38 (for example, trade name Velcro tape) parallel to the left-right direction of the one-seat seat 1 is stretched on the upper surface of the elastic auxiliary member 31, and the elastic net 30 is stretched on the rigid frame 32. The other surface is disposed at a corresponding position on the lower surface of the seat cushion 37.
[0027]
A method of attaching the elastic auxiliary member 31 to the seat frame 19 is as follows. First, a first attachment portion 33 having a hook-like cross-section facing downward and provided on the upper surface of the rear frame of the seat frame 19, and a seat Between the pair of second mounting portions 34 provided on the lower surface of the rear frame of the frame 19 and protruding inward of the seat frame 19, the rear frame 31 a of the rigid frame 32 of the elastic auxiliary member 31 is fitted by a fitting structure. I will be attached. Thereafter, the front frame 31 b on the opposite side of the rigid frame 32 is installed on the pair of third mounting portions 35 provided on the side surface of the front frame of the seat frame 19 and protruding inward of the seat frame 19. Finally, from the upper part of the elastic auxiliary member 31, a fastener 36 to be screwed to the upper surface of the front frame of the seat frame 19 protrudes inward of the seat frame 19 so as to press the upper surface of the rigid frame 32 of the elastic auxiliary member 31. The front frame 31b of the elastic auxiliary member 31 is sandwiched between the third mounting portion 35 and the fastener 36, and the elastic auxiliary member 31 is attached to the seat frame 19.
[0028]
According to the vehicle seat configured as described above, the following effects (1), (2), (3), and (4) can be obtained.
(1) By optimizing the positional relationship between the hip point 23, the back support shaft 21, the seat support shaft 22 and the connecting point 27 and the urging force of the urging member 24, when the reclining is performed, The seating feeling, the restoring force of the backrest frame, the rise of the front end of the seat frame, the inclination angle of the seating surface, and the like are in a preferable state, and stable sitting comfort can be maintained.
(2) By installing the elastic auxiliary member 31 inside the seat portion 4, the seat cushion 37 provided on the upper portion can be made thin and light. Further, by providing two pairs of hook-and-loop fasteners 38 corresponding to the upper surface of the elastic auxiliary member 31 and the lower surface of the seat cushion 37, the elastic auxiliary member due to the seated person's seating / standing, reclining operation, etc. The displacement between 31 and the cushion 37 is prevented.
(3) The elastic auxiliary member 31 can be easily attached to the seat frame 19 by engagement and screwing.
(4) In the case where two one-seat seats 1 arranged in parallel are arranged in front and rear, the two-seat seats 1 are configured so as to be rotatable about the axis of each one-seat seat 1, and the two in the base By linking with the gear and the chain, the seats arranged in the front and back do not interfere with each other, and the one-seat seats 1 arranged side by side can be efficiently rotated in conjunction with each other.
[0029]
In addition, this invention is not limited to the said embodiment, For example, it can also be suitably changed and embodied as follows, for example in the range which does not deviate from the meaning of invention.
(1) It is used for the configuration of the inner frame of each seat of two seats, not one seat.
(2) Making the urging member electric. At that time, the positional relationship among the hip point, the back support shaft, the seat support shaft, and the connection point is the same.
(3) When three single-seat seats are installed side by side on the same base, if one single-seat seat is rotated, the remaining gears and chains are used in the base. The two single-seat seats are equipped with a rotating device that rotates in conjunction with each other.
[0030]
【The invention's effect】
As described above in detail, according to the seat of the first aspect of the invention, when the backrest is reclined, the seat is not only tilted and the seating comfort is kept good, but also the degree of tilting of the seat and There is an excellent effect that the pressing force when reclining and the urging force when returning can be optimized.
[Brief description of the drawings]
FIG. 1 is a partial side view showing a backrest frame, a seat frame, a connecting member and the like before reclining backrest in a seat according to an embodiment of the present invention.
FIG. 2 is a partial side view showing a backrest frame, a seat frame, a connecting member and the like after backrest reclining.
FIG. 3 is an exploded perspective view of a base frame, a backrest frame, a seat frame and the like constituting the seat.
FIG. 4 is an exploded perspective view showing a structure for attaching an elastic auxiliary member to the seat frame.
FIG. 5 is an exploded perspective view of an example in which two same seats (one-seater seat) are connected.
FIG. 6 is a graph showing the relationship between the seating feeling with respect to the distance from the vertical line passing through the hip point of the seated person to the back support shaft and the relationship between the backrest return force and the seat back.
FIG. 7 is a graph showing the relationship between the rise of the front portion of the seat frame and the relationship of the restoring force of the backrest with respect to the distance from the vertical line passing through the backrest support shaft to the seat support shaft measured forward. is there.
FIG. 8 is a graph showing the relationship between the seat surface inclination angle and the relationship between the backrest return force and the distance from the vertical line passing through the backrest support shaft to the connecting point measured backward in the same seat.
FIG. 9 is a side view of a seat according to a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 1-seat seat 3 base 4 seat part 5 backrest 10 gear 11 chain 17 base frame 18 backrest frame 19 seat frame 20 connection member 21 backrest support shaft 22 seat support shaft 23 hip point 24 biasing member 27 connection point 30 Elastic net 31 Elastic auxiliary member 32 Rigid frame 37 Seat cushion

Claims (1)

A seat that is optimally set for a seated person weighing 45-100 kg,
Forward vertical line that passes through the hip point (23) of the occupant to the distance range -10～50Mm, spine rest frame (18) a reclinable supported to the back of the person support shaft (21) the base frame (17) An urging member (24) having an urging force 350 to 500N that urges the backrest frame (18) in a direction in which the backrest frame (18) is always returned from reclining is provided to the base frame (17 ) And the back support frame (18) so as to be connected to a substantially central portion in the height direction. The back support shaft (21) is positioned lower than the back support shaft (21). ) To the base frame (17), the seat support shaft (22) is pivotally supported so that the rear portion of the seat frame (19) can be tilted so as to descend and rise in a distance range of 100 to 200 mm forward from the vertical line passing through the longitudinal and vertical against arranged so as not to be displaced, the spine support shaft ( The distance range 70~110mm rearward than the vertical line that passes through the 1) a lower position and the spine support shaft (21), the connecting member (20) said seat frame extending from the spine support frame (18) A connection point (27) connected to (19) is provided;
Each distance range is a distance range when the backrest frame (18) is in a standing and returning state before reclining, and the backrest support is defined by this time and when the backrest frame (18) is reclined. By keeping the distance (L2) between the vertical line passing through the shaft (21) and the seat support shaft (22) from changing,
When a seated person reclines the backrest frame, it is easy to put a weight on the backrest, and the backrest can be pressed with an appropriate pressing force. The seat frame where the point is pushed down, the rear part descends with a moderate descent amount, while the front part prevents as much as possible,
When the urging member returns the backrest frame from reclining by the urging force, the seat can be surely returned by an appropriate urging force that realizes the appropriate pressing force.

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