JP4060621B2 - Chair - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a chair configured so that a seat can be moved back and forth.
[0002]
[Prior art]
In a chair, the quality of the seating comfort is a factor that has an extremely large influence on the body, work efficiency, and the like, and is most important as a basic function of the chair. For this reason, for example, it is considered to move the seat back and forth so that the waist is securely held in the seat in a posture in which the backrest is tilted backward in combination with reclining of the backrest or rocking of the back seat. .
[0003]
[Problems to be solved by the invention]
In such a chair, there is a configuration in which a rod-like operation rod or a pin is selectively engaged with one of a plurality of fixing holes provided on the fixed side in order to determine and lock the front and rear positions of the seat. To do.
[0004]
However, in order to ensure the strength of the engaging portion, the operating rod or pin must be thickened, and it is difficult to store it in the limited space between the seat and the seat support. Furthermore, if the operating rod or pin is thickened, the pitch of the fixed portion cannot be reduced, and there is a problem that it becomes difficult to set the front and rear positions of the seats in detail.
[0005]
Accordingly, the present invention solves the above-described problems, and relates to a seat locking mechanism that can be stored in a limited space and that can reduce the pitch while ensuring strength.
[0006]
[Means for Solving the Problems]
That is, the chair according to the present invention includes a chair body having a leg, a support base, and a seat and a seat attached to the seat so as to be movable back and forth, and below the seat and between the seat and the seat. Is provided with a plate-like operation plate extending in the width direction of the chair body so that the operation plate can be moved back and forth as the seat moves back and forth, and the operation plate is moved in the width direction of the chair body and seated. Is configured so that it can be locked at a predetermined position and unlocked, and an engagement portion having a shape necessary for meshing is provided on the operation plate, and on the upper surface of the seat on the chair body side. An engaged portion having a shape that allows the engaging portion to engage with each other is provided, and the engaging portion and the engaged portion are engaged with each other so that the seat can be locked at a predetermined position. Features.
[0007]
In such a case, since the operation plate can be made thin, it can be easily accommodated in a limited space between the seat and the seat support.
[0008]
Furthermore, an engagement portion having a shape necessary for meshing is provided on the operation plate, and an engaged portion having a shape capable of meshing with the engagement portion is provided on the upper surface of the seat on the chair body side, and the engagement Since the seat and the engaged portion are engaged with each other so that the seat can be locked at a predetermined position , the lock mechanism can be realized with a simpler configuration .
[0009]
In particular, in order to reduce the pitch at which the seat is fixed while ensuring the strength of the lock, the engaging portion is formed with teeth at one end of the operation plate, and the engaged portion is on the fixed side. What is necessary is just to make it what forms the same tooth | gear in a facing position. This is because by providing a large number of teeth, the strength of the lock can be ensured even if the pitch at the position where the seat is fixed is reduced.
[0010]
In order to realize such a locking mechanism with a simple configuration, the seat is configured to be placed on the seat support, and the engaged portion is formed into an elongated plate-like shape having teeth on one end edge. What is necessary is just to make it form using a member and to interpose this to-be-engaged part between a seat receiver and a seat. In such a case, since the seat is configured to be placed on the seat, the front and rear slides of the seat can be more reliably locked by the overload, and the engaged portion is placed between the seat and the seat. This is because it is possible to save the trouble of providing teeth on the inner surface of the seat.
[0011]
If the engagement portion and the engaged portion are configured to be in close contact or substantially in close contact with each other by an elastic force, the front and rear positions of the seat remain locked even when no force is applied to the operation plate. I can leave.
[0012]
In order to place the seat more effectively on the upper surface of the seat support, a groove for accommodating the operation plate may be provided on the lower surface of the seat. This is because the operation plate is accommodated in the groove so that the lower surface of the operation plate and the lower surface of the seat can be completely or substantially completely flush with each other.
[0013]
In order to ensure that the seat can only move in the front-rear direction, the seat is configured to rest on the seat support, and a long hole extending in the front-rear direction is provided in the seat support so that the protrusion fixed to the seat What is necessary is just to engage with a long hole. This is because the moving direction and moving range of the seat can be regulated by the engagement between the long hole and the protrusion.
[0014]
In order to move the operation plate more easily with a small number of parts, one end of the operation plate may be bent downward to form the operation portion. This is because an operation can be performed by pinching the operation unit, and an operation plate can be operated by placing a hand on the operation unit without protruding the operation plate from the chair body and exposing it to the outside.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below.
[0016]
As shown in FIGS. 1 to 3, the chair C according to the present embodiment has a chair body 1 that forms a base as a structure, a leg 2, a support base 3 attached to the upper end side of the leg 2, and a front This chair is composed of a seat receiver 4 whose part is supported by the support base 3, and a back frame 5 whose base end is attached to the support base 3 and the rear part of the seat receiver 4 is supported by an intermediate part. A seat 6 and a backrest 7 are attached to the seat receiver 4 and the back frame 5 of the main body 1, respectively.
[0017]
First, the chair body 1 will be described.
[0018]
The leg 2 has a structure in which a column 22 is raised from the center of the five leg blades 21, and the column 22 can be moved up and down and incorporates a gas spring mechanism (not shown) inside.
[0019]
The support base 3 is rotatably attached to the upper end portion of the support column 22 and, as shown in FIG. 4, extends horizontally forward and includes a bottom wall 31 that vertically penetrates the support column 22 in a part thereof. A front wall 32 that rises obliquely forward from the front end of the bottom wall 31 and a mechanism that stands up from the periphery of the bottom wall 31 and the front wall 32 and opens upward together with the bottom wall 31 and the front wall 32. It forms a general boat shape including a side wall 33 that forms a part storage space. The support base 3 can be integrally protruded or externally attached to the front portion of the side wall 33 with the shaft center aligned in the back direction. The support base 3 has a back mounting shaft 35 penetrating between the left and right side walls 33 at a position crossing over the bottom wall.
[0020]
As shown in FIG. 5 in a plan view and in FIG. 6 in a perspective view in a state where the seat base 4 is attached to the support base 3, the seat receiver 4 is positioned on the support base 3 and extends longitudinally in parallel at a predetermined interval. The frame 41 and the horizontal frame 42 provided in the position which connects between the front-end vicinity part of these vertical frames 41, and the rear-end vicinity part are comprised in the substantially cross-beam shape. In the vicinity of the front end of each vertical frame 41, a long hole 411 extending in the front-rear direction is provided in correspondence with each other, and the end of the front seat mounting shaft 34 of the support base 3 is connected to each long hole 411. It is inserted along 411 so as to be slidable.
[0021]
As shown in FIGS. 2, 3, etc., the back frame 5 connects a pair of back frame elements 51 bent in an approximately L shape and the vicinity of the upper ends of these back frame elements 51 with a certain gap therebetween. 4 and 6 is installed between a base end 51a of the back frame 51 and a bent portion 51b between a pair of back frame elements 51. To be able to. The base end 51 a of each back frame element 51 is rotatably attached to the back mounting shaft 35 of the support base 3, and the vertical frame 41 of the seat receiver 4 is attached to the rear seat receiving mounting shaft 53 installed between the back frame elements 51. The rear part is attached.
[0022]
As shown in FIG. 4, the chair body 1 has the front seat support mounting shaft 34 positioned on the rear end side of the long hole 411 of the seat support 4, and the back frame 5 rises as shown in FIG. 4. In the state shown by the imaginary line in the drawing, the chair C is given a normal use posture, the front seat support mounting shaft 34 of the support base 3 is positioned on the front end side of the long hole 411 of the seat support 4 and the back frame 5 is tilted backward. The rear end of the seat 4 is depressed to give a resting posture to the chair C, and a so-called synchro tilt mechanism is realized as a whole.
[0023]
The chair body 1 constitutes a locking device by incorporating a reaction force mechanism H into a part of the synchro tilt mechanism, and a locking fixing mechanism E for fixing the locking in a predetermined position and a reaction force for adjusting the locking hardness. A force adjusting mechanism A is added as a component of the locking device.
[0024]
As shown in FIGS. 4 and 6, the reaction force mechanism H is a pair of coils disposed in a mechanism tilting space (approximately 45 °) in the mechanism housing space of the support base 3 and having a front upper end supported by the fixed retainer H1. A spring S, a first rotating arm H2 which is on the back mounting shaft 35 and rotates in synchronization with the tilting motion of the back frame 5, and a position around the axis deviated from the back mounting axis of the first rotating arm H2. And a movable retainer H3 is supported by the movable retainer H3 via the first rotating arm H2 in accordance with the backward tilting operation of the back frame 5. The coil spring S is compressed. In FIG. 6, the first rotary arm H2 between the pair of coil springs S is omitted.
[0025]
As shown in FIG. 5 and a perspective view of the locking position fixing mechanism E attached to the seat receiver 4 in FIG. A pair of locking plates E1 having a fan shape mounted in a plan view so as to be rotatable around, a motion converting mechanism E2 for converting a locking operation of the back frame 5 into a synchronous rotating operation of the pair of locking plates E1, and the locking plates E1 It comprises an operation unit E3 that is selectively fixed. The lock plate E1 has a downward L-shaped radial cross section passing through the first vertical axis X1, and has a hole E1b that opens in the radial direction on the cylindrical surface E1a that is a set of portions that lie on the circumference and hang down. Are provided over a plurality of locations in the circumferential direction at a predetermined pitch, and each hole E1b arrives one after another on a virtual straight line LI1 that connects the axes of the first vertical axes X1 with the synchronous rotation. Face to face. The motion converting mechanism E2 has one end connected to the base end of the fan-shaped lock plate E1 through the engaging portion X2 between the second vertical shaft and the horizontal long hole, and the other end connected to the front seat mounting shaft of the support base 3. 34, which is a rigid connecting member E21 engaged with the bearing member 34. When the seat support 4 moves rearward and downward with respect to the support base 3 in accordance with the locking operation, the support for the lock plate mounted on the seat support 4 is provided. In contrast to the first vertical axis X1, the second vertical axis X2 engaged with the base end of the lock plate E1 is held at a fixed position by the support base 3 via the connecting member E21. When the seat 4 sinks due to locking, the cylindrical surface E1a of the fan-shaped lock plate E1 is pushed by the first vertical axis X1 and swivels backward around the engaging portion X2. The operation portion E3 rotates to the horizontal frame 42 of the seat 4 via the third vertical axis X3 and the lock pin E31 arranged so that the axis coincides with the virtual straight line LI1 and can move in the coaxial direction. A second rotating arm E32 that is attached to the lock pin E31 through a engaging portion X4 between a horizontal long hole and a vertical pin, and the second rotating arm E32 is inserted into the hole E1b of the lock plates E1. A spring element E4 for pressing in the passing direction, a locking position adjusting operation lever E5 for pulling the second rotating arm E32 against the spring element E4 and pulling out the lock pin E31 from the hole E1b of both lock plates E1; The locking position adjusting operation lever E5 is attached to an appropriate position on the side of the seat receiver 4. The spring element E4 and the locking position adjusting operation lever E5 are connected by a wire E6 shown in FIG.
[0026]
As an advantage of the locking position fixing mechanism E, the outer periphery of the lock plate E1 is more greatly shaken in conjunction with the movement of the seat receiver 4, and the outer periphery of the lock plate E1 is locked by the engagement between the hole E1b of the lock plate E1 and the lock pin E31. Since the plates E1 are fixed to each other, and the back seat is fixed to the locking position by stopping the movement of the seat receiver 4, the locking of the back seat is relatively fixed even if the distance between the holes E1b of the lock plate E1 is relatively large. The torque arm from the first vertical axis X1 to the engagement portion between the hole E1b of the lock plate E1 and the lock pin E31 is the relationship between the first vertical axis X1 and the lock plate E1 and the connecting member E21. Since it is larger than the torque arm up to the part X2, the force required for locking can be reduced and even rigidity is given to the lock pin E31 and the lock plate E1. For example, the mechanism itself necessary for fixing can be simplified, and in order to lock the backrest 7 by mutually restraining the pair of lock plates E1, the component parts such as the operation unit other than the connecting member E21 are provided. All can be mounted on the side of the seat 4 and the operation part can always be arranged at a certain relative position with respect to the movement of the seat 6, and the seated person can move away from the chair in a certain locking state. In the case where the reaction force mechanism H tries to move in the direction in which the back seat rises and rises, according to the structure of this embodiment, the lock pin E31 receives a pressing force in the shear direction from the hole E1b of the lock plate E1. By this, the frictional force prevents the lock pin E31 from coming out of the hole E1b, prevents the back seat from rising suddenly even if it stands up from the chair, and by sitting again, For example, the force in the shear direction disappears and the unlocking operation can be performed again. In addition, since the fan-shaped lock plate E1 only rotates in a horizontal plane, a thin design is possible. If teeth that mesh with each other are formed on the outer periphery of the fan-shaped lock plate E1, it is possible to eliminate a deviation in operation. The point that can be done is also an advantage.
[0027]
As shown in FIG. 4, the reaction force adjusting mechanism A is configured so that the fixed retainer H1 of the coil spring S is actually held at the fixed position by the shaft-shaped backup member A10. A third rotary arm A1 that is partially provided with A10 and is rotatable about a horizontal axis A11, and a screw connection from a direction substantially orthogonal to the displacement direction at a position displaced from the horizontal axis A11 of the third rotation arm A1 The screw element A2 having the grip A21, and the screw element A2 passes through the front wall 32 of the support base 3 and protrudes to the outside of the front wall 32. The grip A21 is disposed at the protruding position. ing. When a screw feeding operation is given to the screw element A21 through the grip operation, the third rotating arm A1 rotates about the horizontal axis A11, and the backup position of the retainer H1 is moved via the backup member A10, and the compression force of the coil spring S is increased. It can be moved in the direction to increase or decrease. Since the crossing angle of the third rotating arm A1 and the screw element A2 changes according to the operation position, a pressing plate A22 is attached to the tip of the screw element A2, and a partial arc-shaped protrusion is attached to the third rotating arm A1. By forming A12 and pressing the projection A12 by the pressing plate A22, it is possible to cope with a change in the crossing angle.
[0028]
As an advantage of this reaction force adjustment mechanism A, since it can be incorporated in the longitudinal dimension of the coil spring S, the reaction force adjustment mechanism H is included as compared with the case where the reaction force adjustment mechanism is introduced on one end side of the coil spring S. The axial base can be made compact, and the coil spring S is arranged in a rearward tilting posture (in this embodiment, an inclination of about 45 °), so that the support base that accommodates the coil spring S is provided. The front-and-rear dimension of 3 can be shortened, and thus the interference between the seat 6 and the support base 3 when the seat 6 is slid back and forth can be effectively avoided, and a sufficient operating allowance can be secured. The operation grip A21 can be arranged on the front wall 32 of the support base 3 which is easy to operate, and can be operated lightly by the action of a “lever” based on the arm length of the third rotation arm A1.
[0029]
Then, the seat 6 is attached to the seat receiver 4 and the backrest 7 is attached to the back frame 5 to complete the chair C of this embodiment.
[0030]
In the present embodiment, as shown in FIGS. 7 and 8, the backrest 7 is made of an elastic material core 71 a having a square shape that forms the outer shape of the backrest 7, and the core material 71 a is sewn into a bag shape. A backrest main body 71 comprising a tensioned fabric 71b housed inside, and a backrest upper portion made of a rigid material having a downward U-shape disposed on the back of the upper portion of the backrest main body 71 A reinforcing member 72 and a casing-like backrest lower reinforcing member 73 covering the lower end portion of the backrest main body 71 are provided. The core 71a is slightly bent in the shape of a "<" in the right side view so that a portion that functions as the lumbar support portion 71x is located slightly below the intermediate portion in the vertical direction and protrudes forward. Further, a backrest upper support portion 511 is formed on the back frame element 51. The backrest upper support portion 511 is provided with a pin insertion hole 511a, and the horizontal pin 721 is formed by matching the pin insertion hole 511a with the pin insertion hole 72a1 provided in the lower end portion 72a of the backrest upper reinforcing member 72. Through the horizontal pin 721, the backrest upper reinforcing member 72 is rotatably connected to the backrest upper support portion 511. Further, the upper backrest main body 71 that forms the upper end of the backrest 7 and the backrest upper reinforcing member 72 are covered with a common overstretch 72b. On the other hand, the lower end of the backrest main body 71 is inserted into the opening of the backrest lower reinforcing member 73 to form the lower end 7x of the backrest 7.
[0031]
Below the seat 6, a crank mechanism 8 including a crank portion 81, a crankshaft portion 82 having an operation knob 821 as an operation portion at one end portion, and a crank arm portion 83 having one end portion connected to the crank portion 81 is provided. Provided. The other end portion of the crank arm portion 83 is connected to the lower end portion 7x of the backrest 7 so that the crank arm portion 83 can rotate around the rotation center X10 of the intermediate portion. 6y is supported. The lower end portion 7x of the backrest 7 and the rear end portion 6y of the seat 6 are moved up and down in conjunction with the rotation operation of the operation knob 821. In the present embodiment, a pair of crank arm portions 83 are provided apart from each other in the left and right direction.
[0032]
A stopper 85 (not shown in FIG. 8) is provided on the movement path of the crank portion 81 to restrict the movement range of the crank portion 81. The configuration of the stopper 85 is shown in FIG. 10, and this stopper 85 has a substantially C-shaped cross section made of resin or the like. From the stopper base plate 851 provided horizontally between the back frame elements 51. The opening is attached to the stopper mounting member 852 provided upright with the opening portion facing the movement range of the crank portion 81.
[0033]
A slider 86 (not shown in FIG. 8) is provided on the back surface of the backrest lower reinforcing member, and is always engaged with a guide member 87 (not shown in FIG. 8) fixed at an appropriate position. The lower end portion 7x of the curl 7 is raised and lowered in parallel.
[0034]
On the other hand, the lower end portion 7x of the backrest 7 is provided with an engaging member 74 that engages one end of the crank arm portion 83. On the other hand, one end portion of the crank arm portion 83 is provided with an opening portion 83a opened rearward to be engaged with the engaging member 74, and the other end portion is provided with a long hole 831 to provide the crank portion 81. It is related to.
[0035]
Hereinafter, a method of moving the lower end portion 7x of the backrest 7 from the position shown by the solid line in FIGS. 7 and 9 to the position shown by the imaginary line using the crank mechanism 8 configured as described above will be described.
[0036]
When the operation knob 821 is rotated in the direction of the arrow x in FIG. 7, as shown in FIG. 9, the crank portion 81 rotates together with the crankshaft portion 82, and the long hole 831 and the crank portion 81 are engaged with each other. As a result, the crank arm portion 83 rotates. Then, the engaging member 74 provided at the lower end portion of the backrest 7 is lifted to the opening 83a of the crank arm portion 83, and the lower end portion 7x of the backrest 7 is a position indicated by an imaginary line from the position indicated by the solid line in FIG. From the position shown by the solid line in FIG. 9 to the position shown by the imaginary line, the upper surface 83b of the crank arm part 83 serves as a cam and the rear end 6y of the seat 6 is linked with the lower end 7x of the backrest 7. To rise. Then, the stopper 85 is pushed excessively open and the crank portion 81 is accommodated and held in the stopper 85, and the lower end portion 7x of the backrest 7 and the rear end portion 6y of the seat 6 are shown by imaginary lines in FIG. Keep position.
[0037]
On the other hand, when the lower end portion 7x of the backrest 7 is raised, the portion functioning as the lumbar support portion 71x is pushed up, and the backrest 7 is deformed from the shape shown by the solid line in FIG. 7 to the shape shown by the imaginary line.
[0038]
When the reverse operation is performed, the lower end portion 7x of the backrest 7 returns from the position indicated by the imaginary line in FIGS. 7 and 9 to the position indicated by the solid line. The shape of the droop 7 also returns from the position indicated by the imaginary line in FIGS. 7 and 9 to the position indicated by the solid line.
[0039]
Thus, in the present embodiment, an elongated plate-like operation plate 9 extending in the width direction of the chair body 1 is provided below the seat 6 so that the operation plate 9 can be moved back and forth as the seat 6 moves back and forth. In addition, the operation plate 9 is moved in the width direction of the chair body 1 to lock the seat 6 in a predetermined position, and the lock can be released.
[0040]
Specifically, FIG. 11 is a perspective view from the bottom side showing the seat 6, the seat receiver 4, and the operation plate 9, FIG. 12 is an exploded perspective view, and FIG. 13 is a schematic plan view, respectively. 9 is an elongated plate-like member extending in the width direction of the chair provided with the operation portion 9a by bending one end portion downward, and an engaging portion 9x having a shape necessary for meshing is set at the other end portion. Yes. The engagement portion 9x is formed by forming engagement teeth 9b on one end surface of the operation plate 9. Furthermore, an operation plate storage groove M1 for storing the operation plate 9 is provided on the bottom surface of the seat 6 so that the operation plate 9 is stored so that the bottom surface of the operation plate 9 and the bottom surface of the seat 6 are substantially flush with each other. I have to. On the other hand, on the upper surface of the seat receiver 4 constituting the chair body 1, a lock plate 44, which is an engaged portion having a shape that can be engaged with the engaging portion 9x, is fixedly provided. That is, the engaged portion is fixed on the chair body 1 side. The lock plate 44 has an elongated plate shape extending in the front-rear direction, and is formed by forming engaged teeth 44a on the surface of the operation plate 9 facing the engaging teeth 9b. A lock plate storage groove M2 is provided on the bottom surface of the seat 6 so that the lock plate 44 is stored when the seat 6 is placed on the seat receiver 4. The operation plate storage groove M1 and the lock plate storage groove M2 form a T shape, and the operation plate storage groove M1 extends in the orthogonal direction from the center of the lock plate storage groove M2. More specifically, the operation plate 9 is provided with a long hole 9c, and the operation plate 9 can be moved only in the width direction of the chair C by engaging with an operation plate moving guide pin 68 fixed to the seat 6. ing. In the present embodiment, the operation plate moving guide pin 68 is provided with a male screw portion at the tip and is screwed into a female screw hole HL1 provided in the seat. Further, the operation plate 9 is provided with a spring storage portion 9d, and a spring 91 is attached to the spring storage portion 9d so that the operation plate is pushed toward the lock plate 44 by the elasticity of the spring 91. The engaging teeth 9b of the lock plate 44 and the engaged teeth 44a of the lock plate 44 are closely meshed with each other. The longitudinal frame 41 of the seat receiver 4 is provided with a longitudinally moving guide long hole 41a, and the seat 6 is engaged with a longitudinally moving guide pin 69 which is a projection fixed to the seat 6, and the rear position BK shown by a solid line in FIG. And a forward position FW indicated by an imaginary line in FIG. In the present embodiment, the forward / backward moving guide pin 69 is provided with a male screw portion at the tip and is screwed into a female screw hole HL2 provided in the seat. In addition, in FIG. 13, the seat 6 has shown only the outline.
[0041]
A method of moving the seat 6 back and forth using the operation plate 9 configured as described above will be described below.
[0042]
First, the operation portion 9 a is pulled to separate the operation plate 9 from the lock plate 44. Then, the state in which the engagement teeth 9b of the operation plate and the engaged teeth 44a of the lock plate 44 mesh with each other is released, and the seat 6 can move in the front-rear direction. Then, the seat 6 is moved to a desired front-rear position while pulling the operation plate 9, and the hand is released from the operation plate 9. Then, the operation plate 9 is pushed in the direction of the lock plate 44 by the action of the spring 91, the engagement teeth 9b of the operation plate 9 and the engaged teeth 44a of the lock plate 44 mesh, and the front and rear positions of the seat 6 are locked. Is done.
[0043]
As described above, since the plate-like operation plate 9 is used to lock the front and rear positions of the seat 6, it can be made thin and space can be saved.
[0044]
In particular, in this embodiment, an engaging portion 9x is provided at one end of the operation plate 9, and a lock plate 44, which is an engaged portion having a shape that can be engaged with the engaging portion 9x, is fixed to the seat receiver 4 on the fixed side. Therefore, the lock mechanism can be realized with a simpler configuration.
[0045]
In addition, since the engaging teeth 9b are formed in the engaging portion 9x and the engaging plate 44a is formed on the lock plate 44 as the engaged portion, a large number of teeth are provided, and the fixing position is secured while ensuring the locking strength. Can be set in multiple stages.
[0046]
Further, since the seat 6 is configured to rest on the seat receiver 4, the front and rear slides of the seat can be more reliably locked by the overload, and in addition, the lock plate 44 is fixed to the upper surface of the seat receiver 4. Therefore, the engagement between the engaging teeth 9b and the engaged teeth 44a can be realized with a simple configuration.
[0047]
Further, since the operation plate 9 is accommodated by providing the groove M1 on the lower surface of the seat 6, no useless space is generated between the seat 6 and the seat receiver 4, and the appearance can be refreshed.
[0048]
Since the teeth 9b of the operation plate 9 and the teeth 44a of the lock plate 44 are in close contact with each other by the elastic force of the spring 91, the front and rear positions of the seat 6 can be effectively adjusted even when no force is applied to the operation plate 9. Can remain locked.
[0049]
The present invention is not limited to the embodiment described above.
[0050]
For example, the engaged portion may be formed in another shape such as being provided on the inner surface of the vertical frame of the seat.
[0051]
Further, instead of using the elastic force, the operation plate may be prevented from moving in a state where no force is applied by using a method of inserting the operation plate fixing rod into a fixing hole provided in the operation plate.
[0052]
Further, it is of course possible not to provide a groove on the lower surface of the seat. In this case, an operation plate insertion hole is provided in one of the vertical frames of the seat so that the operation plate can be inserted, and an engaged portion is provided at a position facing the operation plate of the other vertical frame. Configuration etc. can be considered.
[0053]
And, as long as the engaging portion and the engaged portion can be engaged with each other, the strength is ensured even if the engaging portion and the engaged portion are configured using a structure other than the engagement of teeth of the same shape. However, the effect of reducing the pitch can be obtained.
[0054]
In addition, instead of bending the one end portion of the operation plate downward to form the operation portion, the number of parts increases, but it is of course possible to attach a grip for performing the operation separately.
[0055]
Other configurations can be variously modified without departing from the spirit of the present invention.
[0056]
For example, FIG. 14 shows a reaction force adjusting mechanism F as a modification. The reaction force adjusting mechanism F is configured such that the fixed retainer H1 of the coil spring S is held at the fixed position by the shaft-shaped backup member F10, and the backup member F10 is partially provided around the vertical axis F11. The rotary arm F1 is configured to be rotatable, and a screw element F2 having a grip F21 screwed from a direction substantially perpendicular to the direction of displacement at a position displaced from the vertical axis F11 of the rotation arm F1. The screw element F2 passes through the side wall 33 of the support base 3 and protrudes outward of the side wall 33, and the grip F21 is disposed at the protruding position. Then, when a screw feed operation is given to the screw element F21 through the grip operation, the rotary arm F1 rotates about the vertical axis F11, and the backup position of the retainer H1 is changed via the backup member F10, and the initial compression amount of the coil spring S is increased or decreased. It can be moved in the direction of movement.
[0057]
If comprised in this way, since the bulkiness of the direction orthogonal to the bottom wall 31 of the support base 3 will be suppressed, it will become possible to pursue the thinning of the support base 3 and its periphery effectively.
[0058]
【The invention's effect】
As the present invention is described in detail above, the legs, the support base, and the chair main body having a seat support, comprising a seat mounted movably back and forth with respect to the seat support, the lower and seat the seat and the seat A chair-shaped operation plate extending in the width direction of the chair body is provided between the seat and the seat is configured so that the seat can be moved in the front-rear direction, and the front-rear position of the seat is locked using an elongated plate-shaped operation plate. since the way to do, you can save the thickness direction space allows and this to clean the housing to the appearance between the lock mechanism seat and seat support.
[Brief description of the drawings]
FIG. 1 is a front view of a chair according to an embodiment of the present invention.
FIG. 2 is a side view of the chair according to the embodiment.
FIG. 3 is a rear view of the chair according to the embodiment.
FIG. 4 is a longitudinal sectional view showing the vicinity of a support base of the chair according to the embodiment.
FIG. 5 is a plan view showing a seat of the chair according to the embodiment.
FIG. 6 is a perspective view showing a state in which the seat of the chair according to the embodiment is attached to the support base.
FIG. 7 is a conceptual diagram showing a backrest mechanism and operation of the chair according to the embodiment.
FIG. 8 is an exploded perspective view showing the backrest structure of the chair according to the embodiment.
FIG. 9 is a schematic view showing a crank mechanism of the chair according to the embodiment.
FIG. 10 is a schematic view showing a stopper of the crank mechanism of the chair according to the embodiment.
FIG. 11 is a bottom perspective view showing the structure of the connecting portion between the seat of the chair and the seat receiver according to the embodiment.
FIG. 12 is an exploded perspective view showing a connecting portion between the seat of the chair and the seat receiver according to the embodiment.
FIG. 13 is a schematic view showing movement and locking of the seat of the chair according to the embodiment before and after.
FIG. 14 is a view showing still another embodiment of the chair according to the present invention.
[Explanation of symbols]
C ... Chair 4 ... Seat 41a ... Longitudinal guide hole (long hole)
6 ... seat 6y ... rear end 69 of the seat ... back and forth moving guide pin (projection)
7 ... Backrest 7x ... Lower end 71x of backrest ... Lumber support part 9 ... Operation plate 9x ... Engagement part 9a ... Operation part 9b ... Engagement teeth (teeth)
44 ... Lock plate (engaged part)
44a ... engaged teeth (teeth)
M1 ... Operation plate storage groove (groove)

Claims (7)

A chair body having a leg, a support base, and a seat base, and a seat attached to the seat base so as to be movable back and forth, and extending in the width direction of the chair body below the seat and between the seat and the seat base. A plate-shaped operation plate is provided so that the operation plate can be moved back and forth as the seat moves back and forth, and the operation plate is moved in the width direction of the chair body to lock the seat in place. It is configured so that it can be unlocked ,
An engaging portion having a shape necessary for meshing is provided on the operation plate, and an engaged portion having a shape capable of meshing with the engaging portion is provided on the upper surface of the seat on the chair body side, and the engaging portion A chair configured to engage with the engaged portion to lock the seat in a predetermined position . The engaging part is formed by forming teeth at one end of the operation plate, and the engaged part is formed by forming similar teeth at the facing position of the upper surface of the seat on the chair body side. claim 1 chair wherein. The seat is configured to be placed on the seat support, and the engaged portion is formed using an elongated plate-like member having teeth at one end edge, and the engaged portion is formed on the upper surface of the seat support. The chair according to claim 2 , wherein the chair is interposed. The chair according to claim 1, 2, or 3 , wherein the engaging portion and the engaged portion are configured to be in close contact or substantially in close contact with each other by an elastic force. The chair according to claim 1, 2, 3, or 4 , wherein a groove for accommodating the operation plate is provided on a lower surface of the seat. The seat is configured to be placed on the seat support, and a long hole extending in the front-rear direction is provided in the seat support, and a protrusion fixed to the seat is associated with the long hole. A chair according to 2, 3, 4 or 5 . The chair according to claim 1, 2, 3, 4, 5 or 6 , wherein an operation portion is formed by bending one end portion of the operation plate downward.

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