JP2005329102A - Chair with reclining mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chair with a reclining mechanism, capable of relieving the back shifting feel of a user and preventing decline of comfort in the feet of the user even if the chair is reclined under the environment with a fixed seat pitch. <P>SOLUTION: A backrest 22 of the chair is turned with the vicinity of the rotation axis of the body (around the tuber of the ischium) of the user seated on a seat 21 as the rotation axis, when the user tilts the upper half body rearward, to change the posture between an upright posture and a reclining posture. When the backrest 22 is reclined, the seat 21 is associated with the rotation shaft 31 near the front end of the seat as the rotation axis in such a way that the rear end of the seat sinks. An air cylinder (not indicated) is operated in addition to a gas spring 46 with a lock mechanism, only when the posture of the backrest is returned to the upright posture, so that repulsion force for the return is increased. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a chair with a reclining mechanism used for passengers in vehicles such as railway vehicles, aircraft, buses, and ships.

  In a chair provided with a conventional reclining mechanism, the backrest is supported so as to rotate around the area in contact with the rear end of the seat.

  In addition, in office chairs, there is a locking device that can be changed from an upright posture to a reclining posture in less space by improving the position of the center of rotation such as the backrest and keeping the body away from the desk. Proposed. In this locking device, the center of the rotational movement tilting from the upright posture of the backrest and seat to the reclining posture is set above the seat and forward of the backrest, and when changing to the reclining posture, the backrest and the seat Move forward while sinking at the same time. When the reclining is performed, the seat moves forward, thereby preventing the gap with the desk from widening (see Patent Document 1).

International Publication No. WO01 / 064080 Pamphlet

  In the case where the backrest is supported so as to be able to rotate around the area in contact with the rear end of the seat, the rotational center of the upper body of the seated person inclined when reclining is positioned away from the rotational center of the backrest. For this reason, when the backrest is reclined, the backrest has a feeling that the seated person's body is shifted upward, and a phenomenon (so-called back misalignment) occurs such that the jacket is turned up.

  Furthermore, as a result of the back misalignment, the support position of the backrest relative to the back of the seated person is displaced, and the fit is impaired.

  In the locking device, the rear end of the seat sinks due to the reclining, and the front end of the seat moves forward and upward. In the case of passenger chairs, the distance between the front row chairs (seat pitch) is usually fixed, so if the seat protrudes forward by reclining, the foot space between the front seats becomes narrower and the comfortability is reduced. It drops and gives a tight feeling.

  Further, if the front end of the seat rises with reclining, the back of the knee is compressed, and the posture is likely to increase so-called economy syndrome. Conversely, in a structure in which the front end of the seat is lowered by reclining, the foot must be thrown forward in order to fit the back of the knee to the front end of the lowered seat, and the foot becomes cramped by that amount. The nature will decline.

  In addition, a repulsive force for returning the backrest to the upright posture is usually given by a gas spring, etc., but if the seat sinks in conjunction with the reclining, the weight of the seated person when returning to the upright posture You must raise your seat against For this reason, it was difficult to return the upright posture while leaning on the backrest when a repulsive force similar to the conventional one was applied.

  The present invention is intended to solve the above-mentioned problems, relieving the feeling of back misalignment due to reclining, being able to take a deep reclining posture without pressing the back of the knee, and an environment in which the seat pitch is fixed Providing a chair with a reclining mechanism that can provide the appropriate repulsive force to return to the upright posture even when reclining underneath, the comfortability around the feet does not deteriorate, even when the seat sinks in the reclining posture The purpose is to do.

The invention according to claim 1 includes a seat (21) pivotally supported at the front end so that the rear end can sink.
A backrest (22) rotatably supported between an upright posture and a reclining posture around the center of rotation of the body when the person sitting on the seat (21) tilts the upper body backward. ,
When the backrest (22) is in a reclining posture, the amount of subsidence at the rear end of the seat (21) increases, and when the backrest (22) returns to the upright posture, the amount of subsidence is reduced. 21) A chair with a reclining mechanism, comprising: an interlocking mechanism (42, 43, 45) for interlocking the backrest (22).

  According to the above invention, the backrest (22) is rotated between the upright posture and the reclining posture around the center of rotation of the body when the person sitting on the seat (21) tilts the upper body backward. Move. When reclining, the rear end of the seat (21) sinks with the front end of the seat (21) as the center of rotation.

  The center of rotation of the backrest (22) is preferably set at the position of the sciatic nodule of the seated person or the so-called hip point. In order to set the rotation center of the backrest (22) to the position as described above, for example, the backrest (22) may be pivotally supported via a link or the like so as to be suspended from the left and right armrest frames. In addition, the interlocking mechanism (42, 43, 45) between the backrest (22) and the seat (21), for example, engages a shaft or protrusion provided at the rear end of the seat (21) in a groove provided in the backrest (22). It can comprise by combining.

According to a second aspect of the present invention, the interlock mechanism (42, 43, 45) includes a rear end portion of the seat (21) on a seat receiving portion (42, 43) provided integrally with the backrest (22). The chair with a reclining mechanism according to claim 1, wherein the chair has a reclining mechanism.

  According to the above invention, when the backrest (22) is tilted, the seat receiving portions (42, 43) rotate in a circular pattern at the same rotation center integrally with the backrest (22) and descend, and the seat receiving portion The rear end portion of the seat (21) placed on the (42, 43) by its own weight sinks as the seat receiving portion (42, 43) descends, and the seat receiving portion (42, 43) rises. As a result, subsidence decreases.

  The seat receiving portions (42, 43) need to be provided at a position where the position of the seat receiving portion (42) is lowered when the backrest (22) is inclined from the upright posture to the reclining posture. For example, a seat receiving portion (42, 43) may be provided near the lower end of the backrest (22). In addition to placing the rear end portion of the seat (21) directly on the seat receiving portion (42, 43), an arm extended from the vicinity of the rear end of the seat (21) is placed on the seat receiving portion (42, 43). May be.

  Since the rear end of the seat (21) is only placed on the seat receiving portion (42, 43) of the backrest (22), the seat (21) can be opened by pulling up the rear end of the seat (21), In a normal state, various mechanisms hidden under the seat (21) can be maintained.

The invention according to claim 3 includes a power source (46, 50) for providing a repulsive force for returning the backrest (22) to the upright posture,
The power source (46, 50) gives a larger repulsive force when the backrest (22) returns from a reclining posture to an upright posture than when it comes from an upright posture to a reclining posture. Or it is a chair with a reclining mechanism of 2.

  According to the above invention, the power source (46, 50) gives a larger repulsive force when returning from the reclining posture to the upright posture than when going from the upright posture to the reclining posture. When returning from the reclining posture to the upright posture, a greater repulsive force is required than when the depressed seat (21) is reclined by the amount lifted against the weight of the seated person. On the other hand, if a large repulsive force works during reclining, it becomes difficult for a child or a small person who is light in weight and weak to recline itself. Therefore, by increasing the repulsive force that is given when returning to the upright posture rather than when reclining, an appropriate repulsive force can be given in each scene.

  The type of power source (46, 50) is not limited. An elastic spring, electric parts, hydraulic pressure, pneumatic pressure, or the like may be used.

The invention according to claim 4 comprises a seat (21) whose rear end is supported so as to be depressed,
A backrest (22) supported in an upright posture and a reclining posture so that the posture can be changed;
When the backrest (22) is in a reclining posture, the amount of subsidence at the rear end of the seat (21) increases, and when the backrest (22) returns to the upright posture, the amount of subsidence is reduced. 21) and an interlock mechanism (42, 43, 45) for interlocking the backrest (22) and a power source (46, 50) for providing a repulsive force for returning the backrest (22) to an upright posture,
With the reclining mechanism, the power source (46, 50) gives a larger repulsive force when returning the backrest (22) from the reclining posture to the upright posture than when going from the upright posture to the reclining posture. It is a chair.

  According to the above invention, when returning from the reclining posture to the upright posture, a larger repulsive force is applied than when the upright posture is changed to the reclining posture. In the present invention, it is only necessary to have a structure in which the rear end of the seat (21) sinks in conjunction with the backrest (22) during reclining, and the position of the center of rotation of the backrest (22) and the seat (21) is not limited.

The invention according to claim 5 is characterized in that an operation switch for returning the backrest (22) to the reclining posture and an operation switch for returning the backrest (22) to the upright posture are separately provided. Or it is a chair with a reclining mechanism of 4.

  According to the said invention, the operation switch corresponding to each when returning to a reclining attitude | position and returning to an upright attitude | position is provided separately. By having a separate operation switch, the device side can clearly recognize whether the reclining posture or the upright posture is returned (the intention of the seated person), and can be used as a reference for switching the magnitude of the repulsive force.

According to a sixth aspect of the present invention, the power source (46, 50) is a first power source (46) that provides a repulsive force both when the backrest (22) is in the reclining posture and when it is returned to the upright posture. And a second power source (50) that provides a repulsive force only when the backrest (22) is returned to an upright posture.

  According to the above invention, the first power source (46) operates when the reclining posture is set, and both the first power source (46) and the second power source (50) operate when the posture is returned to the upright posture. . Thereby, the magnitude | size of a repulsive force can be switched easily. For example, the first power source (46) is a gas spring with a lock mechanism, and the second power source (50) is an air cylinder (50) or an electric motor.

The invention according to claim 7 is characterized in that the second power source (50) is an air cylinder (50) that is pressurized only when the backrest (22) is returned from the reclining posture to the upright posture. It is a chair with a reclining mechanism of Claim 6.

  According to the above-described invention, a mechanism that gives a repulsive force only when returning to the upright posture is easily realized. For example, on / off of air supply and opening / closing of the exhaust valve of the air cylinder (50) may be controlled.

  According to the chair with the reclining mechanism according to the present invention, since the rotation center of the seated person's body and the rotation center of the backrest are brought close to each other when reclining, even if the posture of the backrest is changed, the backrest and the back of the seated person Is in a state of rotating integrally, the feeling of displacement between the surface of the backrest and the back of the seated person is alleviated, and a better fit can be obtained.

  In addition, the back end of the seat sinks around the front end of the seat in conjunction with the backrest, so the back misalignment can be further reduced and the body can be held in a deep reclining posture that can be held comfortably. You can get a comfortable sitting. Furthermore, since the rear end side of the seat sinks with the front end of the seat as the center of rotation, the position of the seated person's knee hardly changes even when reclining. For example, when the front end of the seat is lifted during reclining, the back of the knee is easily compressed or the lower limbs are congested, but such a situation is prevented.

  In addition, since the front edge of the seat does not come out or descend due to reclining, even if the backrest is reclined in an environment where the seat pitch is fixed, the foot space is secured, ensuring comfortable living Is done. Further, since the front end of the seat does not come out, there is an advantage that the passenger on the passage side can easily go in and out of the seat on the window side even when the chair is reclining.

  In the structure where the back end of the seat is mounted on the seat receiving part provided integrally with the backrest, the structure of the interlock mechanism between the seat and the backrest is simple. It can be opened, and maintenance of various mechanisms hidden under the seat can be performed.

  If the repulsive force that returns the backrest to the upright posture is larger than when it is in the reclining posture when returning to the upright posture, it becomes possible to return to the upright posture even while leaning on the backrest. The burden on the seated person accompanying the return is reduced. On the other hand, since the repulsive force at the time of reclining is smaller than when returning to the upright posture, even a small person can easily recline the backrest.

  In the case of providing individual operation switches for the reclining posture and returning to the upright posture, the device side clearly recognizes whether the reclining posture or the upright posture is restored, and the magnitude of the repulsive force is reduced. Can be switched.

  When the reclining posture is used, the first power source is activated, and when returning to the upright posture, both the first power source and the second power source are activated. can do.

  In the case of using an air cylinder that is pressurized only when the backrest is returned from the reclining posture to the upright posture as the second power source, a mechanism that gives a repulsive force only when the backrest is returned to the upright posture can be easily realized. . In particular, a railway vehicle or the like is provided with an air compressor for opening and closing a door, which can be conveniently used as an air supply source for pressurizing an air cylinder.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  Each figure has shown the chair 10 with a reclining mechanism concerning embodiment of this invention. Here, the chair 10 is configured as a two-seat seat installed in the railcar. 2 shows the front of the appearance of the chair 10, FIG. 3 shows the right side, and FIG. 4 shows the top.

  The chair 10 includes a chair body 11, a rotary leg base portion 12 that is installed on the floor of the vehicle and supports the chair body 11 so as to be pivotable about the center of the bottom of the chair 10, and locks and releases the rotation of the chair body 11. It is comprised from the operation pedal part 13 for performing. The chair body 11 is locked either at a position where the engaging members projecting from the bottoms at the left and right ends engage with the lock portion of the operation pedal portion 13 to face the traveling direction of the vehicle, or at a position rotated 180 degrees relative thereto. The Further, when the pedal 15 of the operation pedal portion 13 is depressed, the lock is released.

  Further, when the pedal of the operation pedal unit 13 is depressed, the wire 16 transmits the operation to the chair main body 11 side, and the backrest 22 of the chair main body 11 automatically returns to the upright posture standing upright from the inclined reclining posture. It has become.

  The chair body 11 includes a seat 21 that forms a seat on which a passenger sits down, a reclining backrest 22, and an armrest 23.

  1 and 5 to 8 show the internal structure of the chair body 11. As shown in FIG. 1 and the like, the chair body 11 includes a frame 30 (not shown) that is directly supported by the rotating leg base 12. The seat 21 is pivotally supported in a not-shown portion of the frame 30 near the front end of the seat by a rotating shaft 31 that is parallel to the seat surface and has an axial direction substantially along the front edge of the seat. The seat 21 rotates about the rotation shaft 31 and sinks downward when the backrest 22 is reclined compared to when the rear end side of the seat 21 is in the upright posture.

  As shown in FIG. 8, the backrest 22 has an internal frame 32. The inner frame 32 includes a left frame 33 and a right frame 34 that extend in a substantially L shape so as to wrap around the lower end of the seat 21 from the lower part of the backrest 22, and a connecting frame 35 spanned between them. ing.

  FIGS. 1 and 5 show the chair 10 viewed from the side so that the internal structure mainly related to the left frame 33 appears, and FIGS. 6 and 7 mainly show the chair body 11 so that the internal structure related to the right frame 34 appears. Is shown from the side. 1 and 6 show a state in which the backrest 22 is in a reclining posture, and FIGS. 5 and 7 show a state in which the backrest 22 is in an upright posture, respectively.

  In the vicinity of the lower ends of the left frame 33 and the right frame 34, connecting rods 36 and 37 that protrude horizontally outward from two points sandwiching an L-shaped bent portion are provided, and a flat plate shape that forms a substantially right triangle at the tip thereof. Are suspended vertically.

  The suspension plates 38 and 39 are pivotally supported by an armrest frame portion (not shown) in which the vicinity of each upper end forms part of the frame 30. Rotation centers 40 and 41, which are pivotal support points of the suspension plates 38 and 39, are projected onto the armrests 23 from the side as the center of rotation when the seated person sitting on the seat 21 tilts the upper body backward. Is set at or near the position. In other words, the rotation centers 40 and 41 are set substantially at locations where the seated person's sciatic nodules and so-called hip points are projected onto the armrests 23 from the side.

  With such a structure, the left frame 33 and the right frame 34 are formed into armrest frames (not shown) so as to rotate around the rotation centers 40 and 41 via the connecting rods 36 and 37 and the suspension plates 38 and 39, respectively. It is suspended. As a result, the backrest 22 rotates around the rotation centers 40 and 41 and changes its posture between a reclining posture and an upright posture.

  As shown in FIGS. 1 and 6, a gentle curve is formed on the inner surface side of the L-shaped bent portion of the left frame 33 and the right frame 34. This portion forms seat receiving portions 42 and 43 on which the rear end of the seat 21 is placed. Specifically, an engagement rod 45 having a circular cross section extending in parallel with the rotation shaft 31 is bridged in the vicinity of the rear end of the seat 21, and the engagement rod 45 is placed on the seat receiving portions 42 and 43. The rear end of the seat 21 is supported by seat receiving portions 42 and 43.

  As shown in FIGS. 1 and 5, the left frame 33 has a L-shaped side on which the side on the backrest 22 side slightly protrudes beyond the bent portion, and the protruding portion is the first power source. The rear end of the cylinder portion 47 of the gas spring 46 with a lock mechanism is pivotally supported. The gas spring 46 with a lock mechanism is bridged under the seat 21 in the front-rear direction of the seat 21, and the tip of the piston rod 48 that enters and exits the cylinder portion 47 is pivotally supported by the underframe 30 below the front end of the seat 21. Has been.

  The gas spring 46 with a lock mechanism gives a repulsive force in the direction in which the backrest 22 returns from the reclining posture to the upright posture. Further, the piston rod 48 can be fixed in an arbitrarily extended state by the lock mechanism. With this locking mechanism, the backrest 22 is fixed at an arbitrary inclination angle. The gas spring 46 with a locking mechanism applies the above repulsive force to the backrest 22 whenever it is not locked.

  As shown in FIG. 6 and FIG. 7, the right frame 34 has a L-shaped side that protrudes slightly beyond the bent portion of the two L-shaped sides as with the left frame 33. The tip of the piston rod 51 of the air cylinder 50 that is the second power source is pivotally supported. Similar to the gas spring 46 with the lock mechanism, the air cylinder 50 is bridged under the seat 21 in the front-rear direction of the seat 21, and the rear end of the cylinder portion 52 through which the piston rod 51 enters and exits is closer to the front end of the seat 21. It is pivotally supported on the underframe 30 below.

  The air cylinder 50 is pressurized so that air is sent into the interior only when the backrest 22 returns from the reclining posture to the upright posture, and gives a repulsive force that urges the backrest 22 from the reclining posture toward the upright posture. It has become.

  FIG. 9 shows a circuit for supplying air to the air cylinder 50. The air cylinder 50 is supplied with air from a compressor (not shown) that the railway vehicle has for opening and closing the door. A tube 60 extending from the compressor under the floor exits on the floor and is connected to the cheese 62 in the chair body 11 via various joints 61 and is branched into two, one of which is connected to the air operated valve 63. The other is connected to the mechanical valve 65 through a reducer.

  The tube extending from the outlet side of the mechanical valve 65 is connected to the input end of the valve opening / closing control air of the air operated valve 63. A tube extending from the outlet side of the air operated valve 63 is connected to an air inlet 53 of the cylinder portion 52 of the air cylinder 50 via a speed controller 66. An exhaust throttle valve 54 is provided at the other end of the cylinder portion 52.

  Each backrest 22 includes a return switch (not shown) that is operated when the backrest 22 is returned from the reclining posture to the upright posture, and a reclining switch (not shown) that is operated when the backrest 22 is tilted from the upright posture to the reclining posture. Are provided. When the reclining switch is turned on, the lock of the gas spring 46 with the lock mechanism is released. When the return switch is turned on, the lock of the gas spring 46 with the lock mechanism is released and the mechanical valve 65 is turned on.

  When a seated person or the like turns on the return switch (for example, pushes it), the mechanical valve 65 is turned on in conjunction with this, and control air is supplied from the mechanical valve 65 to the air operated valve 63 so that the air operated valve 63 The valve is opened, and air from the tube 60 is supplied to the cylinder portion 52 of the air cylinder 50. When the seated person turns off the return switch (for example, releases it), the mechanical valve 65 is turned off in conjunction with this, the control air is not supplied to the air operated valve 63, and the air operated valve 63 is closed. As a result, air is not supplied to the cylinder portion 52 of the air cylinder 50, and the piston rod 51 becomes free.

  Next, an operation related to the reclining of the backrest 22 will be described.

  When the seated person turns on a reclining switch (not shown), the lock of the gas spring 46 with the lock mechanism is released, and the backrest 22 can be brought down to the reclining posture. At this time, since the mechanical valve 65 is off, no air is supplied to the air cylinder 50, and only the gas spring 46 with a lock mechanism provides the repulsive force to return the backrest 22 to the upright posture. Therefore, the seated person can slowly tilt the backrest 22 without applying a large force.

  When the backrest 22 is tilted from the upright posture shown in FIG. 5 to the reclining posture shown in FIG. 1, the backrest 22 rotates around the rotation center 40 set around the hip point of the seated person. Further, as the backrest 22 changes from the upright posture to the reclining posture, the positions of the seat receiving portions 42 and 43 are lowered, and the position of the engaging rod 45 mounted thereon is also lowered, so that the rotating shaft 31 near the front end of the seat 21 is lowered. And the rear end of the seat 21 sinks. That is, when the backrest 22 is set in the reclining posture, the rear end of the seat 21 sinks in conjunction with this.

  Since the backrest 22 rotates about the center of rotation 40 set around the sciatic tubercle of the seated person, the center of rotation of the body and the center of rotation of the backrest 22 when the seated person tilts the upper body backward match. Alternatively, the seating person's back and the surface of the backrest 22 rotate in close proximity to each other. For this reason, even if the backrest 22 is reclined, there is little vertical displacement between the backrest 22 and the seated person's back, and so-called back misalignment, in which the outer jacket is turned up, is prevented.

  Further, since the rear end of the seat 21 sinks in conjunction with the tilting of the backrest 22, the effect of removing the feeling of back displacement is further enhanced. Furthermore, since the rear end of the seat 21 sinks in the reclining posture, the seated person's body is deeply held so as to be held by the chair, and a comfortable sitting comfort is realized.

  By the way, when the seat 21 protrudes forward with the reclining, the space between the front row seat and the front end of the seat 21 is reduced accordingly, and the foot space becomes narrow. Further, when the front end of the seat 21 rises with reclining, the back of the knee is compressed, and it is easy to cause congestion and so-called economy syndrome. On the other hand, when the front end of the seat 21 is lowered by the reclining, the foot must be thrown forward in order to fit the back of the knee to the lowered seat 21, and the foot becomes cramped and the comfortability is reduced accordingly. End up.

  In the chair 10 shown in the present embodiment, the seat 21 rotates around the rotation shaft 31 in the vicinity of the front end of the seat 21, so that the position of the seated person's knee hardly changes even when reclining. For this reason, a deep reclining posture can be taken without pressing the back of the knee. Moreover, even if it reclines in the environment where the seat pitch is fixed, there is an advantage that the area around the feet does not become cramped and the comfortability does not deteriorate.

  When the seat occupant operates the return switch, the lock of the gas spring 46 with the lock mechanism is released and air is supplied to the air cylinder 50, and the repulsive force for returning to the upright posture is the same as the gas spring 46 with the lock mechanism. It is given to the backrest 22 from both of the air cylinders 50.

  In order to return from the reclining posture to the upright posture, a force to push up the rear end of the seat 21 against the weight of the seated person is required, but the returning is performed by two power sources of the gas spring 46 with a lock mechanism and the air cylinder 50. Since it assists, even if the seated person is leaning on the backrest 22, it can be returned to the upright posture, and the burden on the seated person when the backrest 22 is returned to the upright posture is reduced.

  When the backrest 22 is returned from the reclining posture to the upright posture, the position of the seat receiving portions 42 and 43 is raised accordingly, and is placed on the seat receiving portions 42 and 43 via the engaging rod 45. The rear end of the seat 21 rises and the amount of subsidence decreases.

  Since the rear end of the seat 21 is only on the seat receiving portions 42 and 43, the seat 21 can be opened by pulling up the rear end of the seat 21, as shown in FIG. Maintenance work of various mechanisms such as the gas spring 46 with a lock mechanism and the air cylinder 50 hidden underneath is facilitated.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to those shown in the embodiments, and there are changes and additions within the scope not departing from the gist of the present invention. Are also included in the present invention. For example, in the embodiment, the interlocking mechanism is configured such that the engagement rod 45 is placed on the seat receiving portions 42 and 43. However, the left frame 33 and the right frame 34 are provided with slits to be engaged therewith. A configuration in which the rod 45 is engaged may be employed.

  In the embodiment, the gas spring 46 with the lock mechanism and the air cylinder 50 are used as the power source, but the power source is not limited to these. For example, electric power, hydraulic pressure, springs, or the like may be used as the power source. In addition, the suspension plates 38 and 39 are not limited to a flat plate shape, and may be configured by combining several links. If an electric motor or the like is used, a large number of gears and links are required, which complicates the structure. However, if the air cylinder 50 is used, it is only necessary to bridge it to an appropriate location, so the structure is simple. It becomes.

  In the embodiment, the chair is configured as a two-seat chair for a railway vehicle. However, the chair may be an aircraft chair or a theater chair, and the use of the chair is not limited. However, the present invention is suitable for a chair used in an environment where the seat pitch with the front row is fixed.

It is explanatory drawing which showed the internal structure concerning the gas spring with a locking mechanism for the side in the reclining attitude | position of the chair concerning embodiment of this invention so that it might appear. It is a front view which shows the chair concerning embodiment of this invention. It is a right view which shows the chair concerning embodiment of this invention. It is a top view which shows the chair concerning embodiment of this invention. It is explanatory drawing which showed the internal structure concerning the gas spring with a locking mechanism for the side surface in the upright attitude | position of the chair concerning embodiment of this invention so that it might appear. It is explanatory drawing which showed the side surface in the reclining attitude | position of the chair concerning embodiment of this invention so that the internal structure concerning an air cylinder might appear. It is explanatory drawing which showed the side surface in the upright attitude | position of the chair concerning embodiment of this invention so that the internal structure concerning an air cylinder might appear. It is explanatory drawing which showed the front of the chair concerning embodiment of this invention so that a part of internal structure might appear. It is a block diagram which shows the circuit which supplies air to an air cylinder. It is explanatory drawing which shows the opening-and-closing state of the seat of the chair concerning embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Chair 11 ... Chair main body 12 ... Rotary leg base part 13 ... Operation pedal part 14 ... Engagement element 15 ... Pedal 16 ... Wire 21 ... Seat 22 ... Backrest 23 ... Armrest 30 ... Base frame 31 ... Rotating shaft 32 ... Internal frame 33 ... Left frame 34 ... Right frame 35 ... Connecting frame 36, 37 ... Connecting rod 38, 39 ... Hanging plate 40, 41 ... Rotation center 42, 43 ... Seat receiving portion 45 ... engaging rod 46 ... Gas spring with lock mechanism 47 ... Cylinder part 48 ... Piston rod 50 ... Air cylinder 51 ... Piston rod 52 ... Cylinder part 53 ... Air inlet 54 ... Exhaust throttle valve 60 ... Tube 62 ... Cheese 63 ... Air operated valve 65 ... Mechanical valve 66 ... Speed controller

Claims (7)

A seat pivotally supported at the front end so that the rear end can sink,
A backrest that is rotatably supported in an upright posture and a reclining posture around the center of rotation of the body when the person sitting on the seat tilts the upper body backward,
An interlocking mechanism that interlocks the seat and the backrest such that when the backrest is in a reclining posture, the amount of subsidence at the rear end of the seat increases and when the backrest returns to the upright posture, the amount of subsidence decreases. A chair with a reclining mechanism. 2. The chair with a reclining mechanism according to claim 1, wherein the interlocking mechanism includes a rear end portion of the seat placed on a seat receiving portion provided integrally with the backrest. A power source that provides a repulsive force to return the backrest to the upright posture;
3. The reclining mechanism according to claim 1, wherein the power source gives a larger repulsive force when the backrest returns from the reclining posture to the upright posture than when the backrest changes from the upright posture to the reclining posture. Chair. A seat whose rear end is supported so that it can sink,
A backrest that is supported in an upright posture and a reclining posture so that the posture can be changed,
An interlocking mechanism that interlocks the seat and the backrest such that when the backrest is in a reclining posture, the amount of subsidence at the rear end of the seat increases and when the backrest returns to the upright posture, the amount of subsidence decreases. A power source that provides a repulsive force to return the backrest to an upright posture,
The chair with a reclining mechanism, wherein the power source gives a larger repulsive force when the backrest is returned from the reclining posture to the upright posture than when it is changed from the upright posture to the reclining posture. The chair with a reclining mechanism according to claim 3 or 4, wherein an operation switch for returning the backrest to the reclining posture and an operation switch for returning the backrest to the upright posture are provided separately. The power source includes a first power source that gives a repulsive force both when the backrest is in a reclining posture and when the backrest is returned to an upright posture, and a second power that gives a repulsive force only when the backrest is returned to the upright posture. The chair with a reclining mechanism according to claim 5. The chair with a reclining mechanism according to claim 6, wherein the second power source is an air cylinder that is pressurized only when the backrest is returned from the reclining posture to the upright posture.

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