JP2857036B2 - Chair with posture changing function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair having a posture changing function capable of changing to various postures.

[0002]

2. Description of the Related Art There are many kinds of chairs, and they are classified into various types in terms of form, application, structure and material. Work chairs such as stools without backrests, office chairs with backrests, and rests are provided. Functional sofas and easy chairs, and functional chairs such as reclining seats in which the posture of the chairs change, are frequently used in daily life.

[0003] Among such chairs, various types of convenient chairs that can automatically change the posture of the chair over a wide range have been recently attracting attention. An example of such a functional chair is disclosed in Japanese Utility Model Laid-Open No. 1-141.
No. 543, JP-A-1-192307 and the like.

The chair disclosed in Japanese Utility Model Laid-Open Publication No. 1-141543 is provided with a sector gear at a lower portion of a seat plate and driving means for rotating the gear, and the sector gear and the seat plate are linked. The rear of the seat plate is lifted via a sector gear and a link mechanism by driving the driving means, which is connected by a mechanism. By doing so, it is possible to assist the seated person to stand up by the lifting motion behind the seat plate.

The chair disclosed in Japanese Patent Application Laid-Open No. 1-192307 has various link mechanisms installed below a seat plate, and these link mechanisms are mounted on screw shafts arranged in the front-rear direction of the chair. It is operated by rotation so that the footrest can be moved in and out, and the reclining posture of the seat plate and the backrest can be variously changed. It is described that there is a feature in that such various changes in the posture of the chair are performed using a screw shaft.

A chair having such a posture changing function is
It is well known especially for the elderly and those who have a handicap in the body, and the user himself is easy to use and convenient for the caregiver.

[0007]

The structure disclosed in Japanese Utility Model Laid-Open Publication No. 1-141543 is designed so that the rear portion of the seat plate can only compete with the backrest in a predetermined upright posture. Therefore, the occupant must stand up so that it can be lifted only by the seat plate, and a large gap is created between the back and the backrest.
As a result, the body may lose its balance at the time of rising, and it is hard to say that it is very easy to use even if it is used by a healthy person, and it is even more unsuitable for people with a handicap. Conceivable.

[0008] Further, in the apparatus disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 1-192307, the relative positional relationship between the seat plate and the backrest remains unchanged, so that the resting posture is such that the body can be laid on a chair. It is impossible to take the backrest so that it can take a nap on a chair, and it is impossible to make the backrest substantially flush with the seat plate because of its configuration. There is a problem in terms of.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and can be easily changed to a standard sitting posture, a resting posture to lie down on the body, and a leaving assisting posture when standing up. It is an object of the present invention to provide a chair having a posture changing function that can be changed to a nap posture for taking a nap.

[0010]

According to a first aspect of the present invention, there is provided a chair having a posture changing function, wherein a seat plate, a backrest, and a footrest plate are arranged on a base, and they are interlocked with each other. A chair having a posture changing function configured to change into a sitting posture, a resting posture, and a leaving assistance posture, and a backrest frame provided on both right and left sides of the backrest; A pair of left and right connecting plates rotatably coupled to the frame by a backrest rotating shaft, a rotating shaft provided between the left and right connecting plates, and arcuate teeth attached to the rotating shaft. A large gear, a guide rail attached to the large gear, and a pinion with a forward / reverse rotation drive source provided on the connecting plate and meshing with the large gear, and the backrest frame has a backrest at a lower end portion. It is configured to be swingable around the rotation axis, and each of the connecting plates is The first connecting rod and the second connecting rod attached to the frame are vertically movably held, the guide arm attached to the rotating shaft engages with the guide rail, and the foot rest plate serves as a link mechanism. The pinion with the driving source is rotated in one direction by connecting to the seat plate support rod and the connecting plate, and the backrest frame is rotated rearward around the backrest rotation axis via the large gear and the guide arm. At the same time, the chair is changed from the sitting position to the resting position by projecting the footrest frame in front of the seat plate via the seat plate supporting rod and the link mechanism, and by rotating the pinion with the drive source in the other direction, By rotating the connecting plate around the rotation axis without changing the relative positional relationship between the seat plate support rod and the backrest frame while the guide arm is guided by the guide rail, Child is characterized in that it is configured to be changed to Away aid posture from sitting posture.

According to a second aspect of the present invention, there is provided a chair having a posture changing function, wherein a seat plate, a backrest, and a footrest plate are arranged on a base, and they are interlocked with each other in a sitting posture and a rest position. A chair having a posture changing function configured to change to a posture and a nap posture, and a backrest frame provided on both left and right sides of the backrest, and the backrest frame is moved through a backrest rotating shaft. A pair of left and right connecting plates that are rotatably supported, and a footrest that moves forward by a link mechanism, and the backrest frame is configured to be swingable around a backrest rotation axis at a lower end portion, The footrest plate is connected to the seat plate support rod and the connection plate via a link mechanism, and the seat plate support rod is provided with a connection protrusion, and the connection plate is fitted with the connection protrusion and guided by a guide hole. This guide hole is centered on the backrest rotation axis. And set from the constant radius of the locus that is to deviate gradually outwardly toward the rear, along with rotating the backrest frame backward around the backrest pivot axis,
The chair is changed from the sitting position to the resting position and further to the nap position by projecting the footrest frame in front of the seat plate via the seat plate support rod and the link mechanism.In the nap position, the connection protrusion is provided in the guide hole. It is characterized in that it is configured to be guided and deviate from a locus of a constant radius, so as to shift in a state where the connection state with the seat plate support rod is released.

[0012]

According to the chair having the posture changing function of the first aspect, in a chair having a normal sitting posture, the pinion with the driving source is rotated in a predetermined direction to engage with the pinion. The gears move upward, and this movement causes the backrest frame engaged with the guide rail to rotate about the backrest rotation axis, inclining the backrest frame to the rear of the seat plate, and at the same time, the seat plate support rod. Is moved rearward, the link mechanism connected to the seat plate support rod and the connecting plate acts to cause the foot plate to protrude forward of the seat plate and change to the rest position. By performing the reverse operation,
The chair in the rest position returns to the initial sitting position.

Next, in a chair in a normal sitting posture, by rotating the pinion in a direction opposite to the above, the pinion meshing with the large gear raises the tooth surface of the large gear. At this time, the guide arm rises on the outer peripheral surface of the large gear while being guided by the guide rail, and the connecting plate rotates around the rotation axis, so that the rear portion is raised. In this case, since the relative positional relationship between the seat plate support rod and the backrest frame is not changed, the back of the seat plate competes, and the upper portion of the backrest falls forward, The position is changed to the leaving assistance posture in which the user can easily stand up from the seat plate. By performing the operation opposite to the above, the chair in the leaving assistance posture returns to the original sitting posture.

According to the chair having the posture changing function according to the second aspect, in a chair having a normal sitting posture, the pinion with the driving source is rotated in one predetermined direction so as to mesh with the pinion. The gears move upward, and this movement causes the backrest frame engaged with the guide rail to rotate about the backrest rotation axis, inclining the backrest frame to the rear of the seat plate, and at the same time, the seat plate support rod. Is moved rearward, the link mechanism connected to the seat plate support rod and the connecting plate acts to cause the foot plate to protrude forward of the seat plate and change to the rest position.

When the pinion is further rotated in the same direction, the backrest frame further tilts rearward, and shifts from the resting posture to the nap posture. In this case, since the connection protrusion is guided by the guide hole and deviates from the locus of a constant radius, the connection state with the seat plate support rod is released, so that even if the chair shifts from the resting position to the nap position, the footrest plate is The position maintains the resting position. Therefore, in the nap position,
Since the foot rest, the seat and the backrest all form substantially the same plane, a sufficient nap can be achieved on the chair. By performing the reverse operation, the chair in the nap position returns to the initial sitting position via the resting position.

[0016]

FIG. 1 is an external perspective view showing an example of a chair having a posture changing function according to the present invention in a sitting posture.
As shown in this figure, a chair C according to the present invention includes a seat plate X as a seating surface, a backrest Y provided behind the seat plate X,
And a foot plate Z provided at a lower front portion of the seat plate X. A pair of left and right armrests P is provided on both sides of the seat plate X, and a grip 91 for facilitating seating and leaving the seat is provided at the front of these armrests P. A caster 92 is provided at the bottom of the chair C so that the chair C can be easily moved by pushing the chair C.

FIG. 2 is a perspective view showing an example of an internal driving mechanism of a chair having a posture changing function according to the present invention. As shown in this figure, the seat plate X, the backrest Y, and the footrest plate Z are disposed on a base 1, and they are interlocked with each other in a sitting posture shown in FIG. 1 and a rest posture shown in FIG. , And the leaving assistance posture shown in FIG.

First, the outline of the configuration of the driving mechanism of the chair C of the present invention will be described. The drive mechanism of the chair C according to the present invention includes a backrest frame 5 provided on both left and right sides of the backrest Y, and a pair of left and right pivotally connected to the backrest frame Y by the backrest rotation shaft 4. A connecting plate 3, a large gear rotating shaft 6 provided between the left and right connecting plates,
A large gear 61 attached to the rotating shaft 6 and having arcuate teeth, and a guide rail 6 attached to the large gear 61
2 and a pinion 32 with a drive source for forward and reverse rotation, which is provided on the connecting plate 3 and meshes with the large gear 61.

An armrest attachment member 36 for attaching an armrest P having a male screw at the tip is fixedly provided on the outer surface of the connecting plate 3. In the case of this embodiment, the armrest mounting member 3
6 are provided two per one connecting plate 3. A part of the armrest P is inserted through the male screw of the armrest attachment member 36,
Fastened with nuts. Therefore, when the connecting plate 3 moves variously, the armrest P also moves via the armrest mounting member 36.

The backrest frame 5 is attached at its lower end so as to be swingable integrally around the backrest rotating shaft 4, and each of the connecting plates 3 is attached to the frame 1 by the first connecting plate 3. It is held by the rod 2 and the second connecting rod 14 so as to be vertically movable. A guide arm 41 attached to the backrest rotating shaft 4 is engaged with a guide rail 62, and the foot rest plate Z is connected to the seat plate support rod 7 and the connecting plate 3 via a link mechanism. Have been. A footrest frame 8 is attached to the end of the link mechanism.

The outer surface of the seat plate support rod 7 has
Two brackets 35 each having a female screw threaded at the center are provided, and a side plate of the seat plate X is attached to this bracket 35 via a male screw. Therefore, the seat plate support rod 7
Moves, the seat plate X also moves accordingly.

A backrest Y is attached with the backrest frame 5 as a core, and a seat plate X
A footrest Z is attached to the footrest frame 8, and an armrest P is extended above the base 1 to form a chair C.

The chair C of the present invention will be described in more detail. In the present embodiment, a pair of right and left columns 11 are erected in the rear width direction of the base 1. A support plate 15 is bridged between the columns 11, and a first horizontal shaft 12 is provided on the support plate 15. A pair of left and right first connecting rods is rotatable about the first horizontal shaft 12. 2 are provided. A second horizontal shaft 13 is provided substantially at the center of the base 1.
A pair of left and right second connecting rods 14 are provided to be rotatable around.

A third horizontal shaft 21 is provided at the tip of the first connecting rod 2, and a pair of left and right connecting plates 3 are provided rotatably around the third horizontal shaft 21. A backrest rotating shaft 4 is rotatably provided at a rear portion between the pair of left and right connecting plates 3. A pair of right and left backrest frames 5 integral with the backrest rotating shaft 4 are provided on both sides of the backrest rotating shaft 4, respectively. The connection plate 15
Is provided with a protruding end 34 protruding rearward at a lower rear portion of the
The protruding end 34 is supported by the support plate 15.

A large gear turning shaft 6 is rotatably inserted between the pair of left and right connecting plates 3 so as to be rotatable. 14 is rotatably supported at its tip. Such a large gear rotating shaft 6
A gear 61 having arc-shaped teeth is supported at the center of rotation, and on one side of the gear 61 and the gear 61
An arc-shaped guide rail 62 is provided at a rear portion of the guide rail. The outer peripheral edge of the guide rail 62 forms an arc concentric with the gear 61, and the diameter of the arc is the gear 6.
It is slightly smaller than that of 1. Further, the lower end of the guide rail 62 has a hook 6 cut out toward the center (ie, the direction of the large gear rotating shaft 6).
2a is formed.

FIGS. 3A and 3B are enlarged side views of the rear end portion of the seat plate support rod 7, wherein FIG. 3A shows a state in which the backrest frame 5 holds a substantially upright posture, and FIG. This shows a state where the frame 5 is tilted backward. As shown in FIGS. 2 and 3, connecting projections 75 are provided at rear ends of the pair of left and right seat plate supporting rods 7 so as to protrude in directions facing each other. A guide hole 33 for penetrating a piece or the projecting connection protrusion 75 is formed in the rear portion of the connection plate 3. This guide hole 3
Numeral 3 is set so as to gradually deviate outward from the locus of the circle indicated by the chain line in FIG. A hole 33a is formed.

On the other hand, the side of the backrest frame 5
A connecting piece 51 is attached to a portion corresponding to the guide hole 33. The connecting piece 51 is formed with a sliding surface 53 whose upper left edge in FIG. 3 is set to form an arc trajectory about the backrest rotating shaft 4.
On the right side of 1, a hook portion 52 that is recessed downward is formed following the sliding surface 53. The connecting piece 51 corresponds to a rear side edge of the backrest frame 5 that abuts on a connecting protrusion protruding from the so-called guide hole 33.

When the chair C is in the sitting posture, that is, when the chair C is in the state shown in FIG.
The connection protrusion 75 fitted into the third support member 3 is inserted into the left end of the guide hole 33 and is engaged with the hook portion 52 of the connection piece 51 attached to the side surface of the backrest frame 5. In this state, the pair of left and right backrest frames 5
And a pair of left and right seat plate supporting rods 7 are connected to each other.

When the chair C is in the resting or napping position, as shown in FIG.
The connection protrusion 75 provided at the tip of the arm is guided by the guide hole 33 formed in the connection plate 3 and moves rightward, and is disengaged upward from an arc locus centered on the backrest rotation shaft 4 and locked. Release hole 3
3a. Therefore, the connecting projection 7
5 is in a state where the locking by the connecting piece 51 integrated with the backrest frame 5 is released, the backrest frame 5 rotates clockwise around the backrest rotation shaft 4, and furthermore, Even if the leaning of the back frame 5 becomes large, the connecting protrusion 75 only slides on the sliding surface 53 of the connecting piece 51,
The seat plate support rod 7 does not move rightward.

A fourth horizontal shaft 71 is provided at the front of the pair of left and right seat plate supporting rods 7, and a pair of left and right third connecting rods 72 are rotatably provided around the fourth horizontal shaft 71. Supported. These third connecting rods 72 are, at a portion closer to the upper portion thereof, formed by a distal end of a first auxiliary connecting rod 70 a pivotally supported by a sixth horizontal shaft 701 provided on the connecting plate 3 and a fifth horizontal shaft 73. At the lower part of the connection, it is connected by the eighth horizontal shaft 720 to the distal end of the second auxiliary connecting rod 70b which is supported by the seventh horizontal shaft 702 provided on the connecting plate 3 at the lower part. ing.

The distal ends of the pair of left and right seat plate supporting rods 7 and the distal ends of the pair of left and right third connecting rods 72 are respectively a fourth connecting rod 741, a fifth connecting rod 742, and a sixth connecting rod. 743 and the parallel link mechanism including the footrest frame 8, the movement of the seat plate support rod 7 and the third connecting rod 72 is transmitted to the operation of the footrest frame 8, and the seat plate support rod 7 is moved rearward. In the lowered state, the footrest frame 8 takes a horizontal posture in front of the seat plate X from a vertical posture.

Further, one of the pair of left and right connecting plates 3 has a pinion 3 which is rotated by the rotation of a driving motor 31.
2 are provided. This pinion 32 is used for the large gear 6.
1 is engaged.

On the other hand, a guide arm 41 is fixed to the backrest rotating shaft 4. A roller 42 is attached to the tip of the guide arm 41.
Is set so as to face the hook portion 62a of the guide rail 62 when the chair C is in the sitting posture, the pinion 32 rotates clockwise, and the large gear 61 meshing therewith moves counterclockwise. When rotating, the roller 42 moves upward while being locked by the hook portion 62a. Conversely, when the pinion 32 rotates counterclockwise, the large gear 6 does not rotate clockwise due to a stopper (not shown), and the roller 42 is guided upward by the peripheral edge of the guide rail 62 and moves upward. It has become.

The operation of the present invention will be described below with reference to FIGS. First, FIG. 4 is a side view for explaining the operation of the internal drive mechanism of the chair C of the present invention.
Shows a state when the seating posture is as shown in FIG. In this state, the seat plate supporting rod 7 is in a substantially horizontal state, and the backrest frame 5 is slightly inclined backward at an angle suitable for seating. Also, the footrest frame 8
Indicates a substantially vertical posture in the lower front part of the seat plate support rod 7 so as not to obstruct the seated person.

Next, in the state of the sitting posture of FIG.
The drive motor 31 is driven to rotate the pinion 32 clockwise. Then, since the pinion 32 is meshed with the large gear 61, the large gear 61 tries to rotate counterclockwise around the large gear rotating shaft 6.

However, when the large gear 61 rotates counterclockwise around the large gear rotating shaft 6, the hook portion 62a of the guide rail 62 provided on the side pushes the roller 42 of the guide arm 41 upward. Therefore, the guide arm 41 and the backrest frame 5 rotate clockwise around the backrest rotation shaft 4, and the backrest frame 5 is connected to the seat plate support rod 7 via the connection protrusion 75 and the hook portion 52 of the connection piece 51. To the right. Since the seat plate supporting rod 7 is connected to the connecting plate 3 via the fourth horizontal shaft 71 and the fifth horizontal shaft 73 of the third connecting rod 72, when the seat plate supporting rod 7 moves to the right, When the third connecting rod 72 rotates clockwise about the fifth horizontal shaft 73, the footrest frame 8 rises while rotating clockwise, and is positioned in front of the seat plate supporting rod 7. become.

Since the movement path of the connecting plate 3 is regulated by the first connecting rod 2 and the second connecting rod 14,
In the state where the large gear rotating shaft 6 is rotated counterclockwise around the second horizontal shaft 13 and the third horizontal shaft 21 is regulated by a trajectory that rotates clockwise around the first horizontal shaft 12, the connecting plate 3 rises to a state as shown in FIG. The state shown in FIG. 5 exemplifies a state of a resting position of the chair, in which the backrest frame 5 is tilted rearward at a considerable angle, and the footrest frame 8 is in a substantially horizontal posture in front of the seat plate supporting rod 7. It has become. This state is nothing but the resting posture of the chair C shown in FIG.

When the chair C is in the resting position, the connection protrusion 75 provided on the right end of the seat plate supporting rod 7 is formed in the connection plate 3 as shown in FIGS. Since it is guided by the provided guide hole 33 and fitted into the lock release hole 33a, the lock by the connecting piece 51 integrated with the backrest frame 5 is released, and further the backrest frame Since the seat plate support rod 7 is not pulled rightward via the connection protrusion 75 even when the user tilts the floor 5, the footrest frame 8 is connected via the link mechanism connected to the left side of the seat plate support rod 7. Your posture will not change.

Therefore, in the state shown in FIG. 5, when the pinion 32 is further rotated clockwise, the large gear 61 is further raised and its hook portion 62a pushes up on the backrest rotating shaft 4, and the backrest frame Reference numeral 5 further rotates clockwise around the backrest rotation shaft 4, and assumes a nap state shown in FIG.
In the nap posture, the footrest frame 8 holds the position in the resting posture as described above. This state corresponds to the nap posture of the chair C shown in FIG.

By performing the reverse operation (that is, by rotating the pinion 32 in the counterclockwise direction), the backrest frame 5 rotates counterclockwise about the backrest rotating shaft 4 and the seat plate is rotated. The support rod 7 moves forward and the large gear 6
1 returns to the original sitting posture shown in FIG. 4 by rotating clockwise around the large gear rotating shaft 6 or the like.

Now, in reverse, in the sitting posture shown in FIG.
When the pinion 32 is rotated counterclockwise, the gear 61
Rotates clockwise, but the rotation is restricted by the stopper (not shown) abutting on the connecting rod 14 first, and the pinion 32 climbs over the large gear 61. This upward movement involves a counterclockwise rotation of the connection plate 3 around the large gear rotation shaft 6,
Since the movement of the connecting plate 3 is restricted by the large gear rotating shaft 6 and the third horizontal shaft 21 in the swing range of the first connecting rod 2 and the second connecting rod 14, the connecting plate 3 is moved counterclockwise. , The large gear rotating shaft 6 rotates around the second horizontal shaft 13, and the third horizontal shaft 21 rotates around the first horizontal shaft 12, and as a result,
As shown in FIG. 5, the connecting plate 3 is inclined forward and downward with no change in the relative positional relationship between the seat plate supporting rod 7 and the backrest frame 5.

Since the relative positional relationship between the backrest frame 5 and the seat plate support rod 7 does not change during the above operation, the footrest frame 8 connected to the backrest frame 5 and the seat plate support rod 7 It does not protrude forward. This state corresponds to the leaving assistance posture of the chair C shown in FIG. 10, in which the rear portion of the seat plate X is competing, the backrest Y is pushed obliquely forward, and the armrest P Upper part is seat plate X
Is inclined so as to be substantially parallel to the seat surface of the seat plate X, thereby greatly contributing to the occupant leaving the seat plate X.

By performing the reverse operation, the operation shown in FIG.
Return to the original state shown in.

As described above, according to the chair having the posture changing function of the present invention, the chair posture can be changed from the sitting posture to the resting posture and the napping posture, and further from the seating assist by only a switch operation for changing the driving direction of the driving source in the forward / reverse direction. It can be easily switched to the posture, and even if the posture changes from the resting posture to the nap posture, the posture of the footrest is not changed. Since the driving force from the driving source is used to change the posture of the chair in combination with the mechanism, the driving efficiency is better, the response is better, and the gears are better than those using a conventional screw shaft or hydraulic mechanism. It can be arranged on the lower side of the seat plate, and is extremely excellent in that a space-saving layout becomes possible.

In the present embodiment described in detail above, the gear 61 and the drive motor 31 and the pinion 3
2 and the like, only one set is provided on the side of one light shielding plate 3 as shown in FIG. 2, but is not limited to one set and is provided on the side of both light shielding plates 3. In this way, two sets of right and left may be used. By doing so, the posture of the chair can be changed more powerfully and quickly.

The chair having the posture changing function according to the present invention illustrated in FIGS. 1 to 10 is an easy chair for furniture which is usually used, and is used mainly in daily living indoors. In particular, since it can be set in a leaving-assistance posture, it is suitable for use by persons requiring care. The present invention is not only used in such indoor daily life,
It has a wider range of uses. Hereinafter, the application of the chair having the posture changing function of the present invention to other uses will be described.

FIGS. 11 and 12 are side view explanatory views illustrating a state in which a chair having a posture changing function according to the present invention is applied to an automobile. FIG. 11 shows a front seat of a sports type automobile. FIG. 12 shows a state applied to a rear seat of a normal passenger car.

As shown in these figures, 100
A car seat C1 is provided in the room. The seat C1 includes a seat bottom X1 as a seat, a seat back Y1 as a backrest, and a footrest Z1 as a footrest. Further, inside the seat C1, a posture changing mechanism as illustrated in FIGS. 1 to 10 is provided in a state where dimensions are set so as to be applicable as the seat C1 of the automobile 100. The dimensions and layout of each part are slightly different from those described above, but the configuration and operation are exactly the same as those described above.

Accordingly, the seat bottom X1, the seat back Y1, and the footrest Z1 which constitute the seat C1.
When the seated person performs a predetermined operation, the posture is changed to various postures in conjunction with each other.

In FIGS. 11 and 12, the seat C1 indicated by the solid line has a driving posture corresponding to the sitting posture of the above example, and the driving operation of the automobile is performed in this state. In addition,
In the driving posture, fine adjustment of the tilt angle of the seat back Y1 can be freely performed in the same manner as in a conventional automobile seat.

In the same figure, the seat C1 indicated by a dashed line indicates a resting posture, and the seat back Y1 is greatly inclined rearward, and in conjunction therewith, hangs down at the lower front portion of the seat bottom X1. Footrest Z
1 stands up and is almost in a horizontal position. Therefore, in the rest position of the seat C1, the seated person can lay down their body and rest.

Further, in this figure, the two-dot chain line shows the getting on / off posture of the seat C1 corresponding to the above-mentioned leaving assisting posture. In this position, the rear of the seat bottom X1 is slightly lifted, and at the same time, the seat back Y1 is in a substantially vertical position. By setting the seat C1 in such an entry / exit posture, the hip point at the seat bottom X1 is located at an upper position, so that entry / exit of the sports car type vehicle as illustrated in FIG. 11 becomes very easy. .

FIG. 13 is an explanatory side view showing a state in which a chair having a posture changing function according to the present invention is applied to an office chair. FIG. 13A shows a state in which the chair is in a resting posture or a nap posture. B) the chair is in a normal talking position,
(C) shows a state where the chair is in the working posture.

The office chair C2 is similar to the seat plate X2 as described above.
, A backrest Y2, and a footrest plate Z2. Armrests P2 are provided on both sides of the seat plate X2.
The seat plate X2, the backrest Y2, and the foot plate Z
2, the posture of the office chair C2 changes in conjunction with each other, and this posture changing mechanism is exactly the same as that described above. However, the dimensions and layout of each part have been slightly changed in design to fit the office chair C2.

First, in the resting posture shown in (a), the backrest Y2 of the office chair C2 is tilted rearward, and the footrest Z2 is in a state of advancing in front of the seat X2. You can lay down your tired body slowly. Further, if the backrest Y2 is tilted as shown by a two-dot chain line, the office chair C2 assumes a nap posture and can take a nap.

Next, the discourse posture of (b) is as follows.
Is a standard normal sitting position. The backrest Y2 is slightly inclined backward, and the footrest Z2 is hung in front of the seat X2. In this position, the occupant is seated normally, talking to other people, or meditating.

The work posture of (c) is a posture corresponding to the above-mentioned leaving assistance posture or getting on / off posture, and the backrest Y2 is in a state of standing substantially vertically. The rear portion of the seat plate X2 is slightly lifted, and the armrest P2 is also inclined forward. Accordingly, the occupant of the office chair C2 raises the hip point, leans forward slightly, and assumes a posture toward the desk 200, which makes it easier to work. Even if the office chair C2 has a soft seat such as a sofa, the work can be easily performed by changing the posture to the work posture as described above.

Although the chair according to the present invention has been described in detail as being applicable as a chair for furniture, a seat for an automobile, or an office chair, the chair having the posture changing function of the present invention has the scope of the gist. As long as it does not exceed, its use is not limited to furniture, automobiles, office use, etc. The most common ordinary home chairs are natural, as well as medical chairs used in hospitals etc. It can be applied to various applications.

[0059]

As described above, the chair having the posture changing function of the present invention has a seat plate, a backrest, and a footrest plate which are arranged on a base, and which are interlocked with each other to take a sitting posture. And a chair having a posture changing function configured to change to a resting posture, wherein the pinion with the driving source is rotated in one direction to rotate the pinion with the driving source through the large gear and the guide arm, and the backrest is rotated around the backrest rotation axis. The chair is changed from the sitting position to the resting position by rotating the backrest frame rearward and projecting the footrest frame to the front of the seat plate via the seat plate support rod and the link mechanism. By rotating the guide arm in the other direction, the connection plate is rotated around the rotation axis without changing the relative positional relationship between the seat plate support rod and the backrest frame while the guide arm is guided by the guide rail. Is configured to chair is changed Away aid posture from sitting posture by the.

Therefore, in a chair in a normal sitting posture,
By rotating the drive source pinion in one predetermined direction, the large gear meshing with this pinion rotates,
Due to this rotation, the backrest frame engaged with the guide rail rotates around the backrest rotation axis, and the backrest frame tilts backward of the seat plate, and at the same time the seat plate support rod moves rearward, The link mechanism connected to the seat plate support rod and the connecting plate acts to cause the footrest plate to protrude forward of the seat plate and change to the resting position.

Next, in a chair in a normal sitting posture, by rotating the pinion in a direction opposite to the above, the pinion meshing with the large gear raises the tooth surface of the large gear, and At this time, the guide arm rises on the outer peripheral surface of the large gear while being guided by the guide rail, and the connecting plate rotates around the rotation axis, so that the rear portion is raised. In this case, since the relative positional relationship between the seat plate support rod and the backrest frame is not changed, the back of the seat plate competes, and the upper portion of the backrest falls forward, The position is changed to the leaving assistance posture in which the user can easily stand up from the seat plate.

Further, the backrest is further tilted from the resting position so as to assume a nap position, in which case the connecting projection provided on the seat plate support rod is guided by the guide hole formed in the connecting plate. If it is configured so that the connection state with the seat plate support rod is released by deviating from the locus of a constant radius, in the nap posture, the foot rest plate maintains the position of the rest position, and the foot rest plate, the seat plate Since both the backrest and the backrest form substantially the same plane, it is possible to take a good nap on the chair, which is convenient.

As described above, in the chair having the posture changing function of the present invention, the posture of the chair can be changed to the sitting posture, the resting posture, the unattended assisting posture, and the nap posture only by operating the switch for changing the driving direction of the driving source in the normal or reverse direction. It can be easily switched, and the combination of a gear mechanism and a link mechanism uses the driving force from the drive source to change the posture of the chair, so driving efficiency is higher than that using conventional screw shafts and hydraulic mechanisms. This is very useful because it is good, has good responsiveness, and the gear can be arranged on the lower side of the seat plate.

The chair having such a posture changing function has a wide application range, and can be used as a seat for an automobile or an office chair in addition to the use as a normal furniture chair. When used as a furniture chair, it can be used as an easy chair with a very wide range of posture changes or for people with a handicap. When the seat is used as a vehicle seat, the seat can be set to a posture most suitable for driving, resting, and getting on and off. Further, when the chair is used as an office chair, the chair can be appropriately set to a normal sitting posture in front of a desk, a working posture on a desk, a resting posture to relieve fatigue, and the like, which is very convenient.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing an example of a chair having a posture changing function according to the present invention in a sitting posture.

FIG. 2 is a perspective view showing an example of an internal drive mechanism of a chair having a posture changing function according to the present invention.

FIG. 3 is a partially enlarged view showing a connection state between a backrest frame at a rear portion of a connection plate and a seat plate support rod, wherein (a) shows a state in which the chair is in a sitting posture, and (b) shows a state in which the chair is napping This shows a state of posture.

FIG. 4 is an explanatory diagram for explaining the operation of the internal drive mechanism, and illustrates a case where the chair is in a sitting posture;

FIG. 5 is an explanatory diagram for explaining the operation of the internal drive mechanism, and illustrates a case where the chair is in a resting position;

FIG. 6 is an explanatory diagram for explaining an operation of the internal driving mechanism, and illustrates a case where the chair is in a nap state;

FIG. 7 is an explanatory diagram for explaining the operation of the internal drive mechanism, and illustrates a case where the chair is in a leaving assistance posture state.

FIG. 8 is an external perspective view when the chair is in a resting position.

FIG. 9 is an external perspective view when the chair is in a nap posture.

FIG. 10 is an external perspective view when the chair is in a leaving assistance posture state.

FIG. 11 is an explanatory side view illustrating a state in which a chair having a posture changing function according to the present invention is applied to a front seat of a sports type automobile.

FIG. 12 is an explanatory side view illustrating a state in which a chair having a posture changing function according to the present invention is applied to a rear seat of a normal passenger car.

FIG. 13 is an explanatory side view illustrating a state in which a chair having a posture changing function according to the present invention is applied to an office chair, wherein (a) is a state in which the chair is in a resting position or a nap position, and (b). Is in the normal talking posture of the chair, (c)
Indicates that the chair is in a working position.

[Explanation of symbols]

 Reference Signs List 1 base 11 support 12 first horizontal axis 13 second horizontal axis 14 second connection rod 2 first connection rod 21 third horizontal axis 3 connection plate 31 drive motor 32 pinion 33 guide hole 33a lock release hole 4 backrest Active shaft 41 Guide arm 5 Backrest frame 51 Connecting piece 52 Hook 53 Sliding surface 6 Large gear rotating shaft 61 Large gear 62 Guide rail 7 Seat plate supporting rod 71 Fourth horizontal axis 72 Third connecting rod 73 Fifth horizontal Axis 74 Link mechanism 8 Footrest frame C Chair C1 Seat C2 Office chair X, X2 Seat Y, Y2 Backrest Z, Z2 Footrest X1 Seat bottom Y1 Seat back Z1 Footrest

Continued on the front page (56) References JP-A-61-238232 (JP, A) JP-A-63-145654 (JP, A) JP-A-63-123159 (JP, U) JP-A-64-42023 (JP) , U) Hikaru 1-141543 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) A47C 1/035

Claims (2)

(57) [Claims] 1. A seat plate, a backrest, and a footrest plate are provided on a base, and they are configured to change to a sitting posture, a resting posture, and a leaving assistance posture in conjunction with each other. A backrest frame provided on both left and right sides of the backrest, and a pair of left and right connecting plates rotatably coupled to the backrest frame by a backrest rotating shaft. A rotating shaft provided between the left and right connecting plates,
A large gear having arcuate teeth attached to the rotating shaft, a guide rail attached to the large gear, and a pinion with a forward / reverse drive source provided on the connecting plate and meshing with the large gear. The backrest frame is configured to be swingable around a backrest rotation axis at a lower end portion, and each of the connection plates is vertically moved by a first connection rod and a second connection rod respectively attached to the frame body. The guide arm attached to the rotating shaft is engaged with a guide rail, the footrest is connected to a seat plate support rod and a connection plate via a link mechanism, and the pinion with the drive source is held. By rotating in one direction, the backrest frame is rotated rearward around the backrest rotation axis via the gear wheel and the guide arm, and the footrest frame is mounted on the seatplate via the seatplate support rod and the link mechanism. In front of the The chair is changed from the sitting posture to the resting posture by letting it out, and the guide arm is guided by the guide rail by rotating the pinion with the drive source in the other direction, and the relative position between the seat plate support rod and the backrest frame. A chair having a posture changing function, wherein the chair is changed from a sitting posture to a leaving assistance posture by rotating the connecting plate around the rotation axis without changing the relationship. 2. A posture changing device in which a seat plate, a backrest, and a footrest plate are arranged on a base, and are changed to a sitting posture, a resting posture, and a nap posture in conjunction with each other. A chair having a function, a backrest frame provided on both left and right sides of the backrest, and a pair of left and right connecting plates rotatably supporting the backrest frame via a backrest rotation shaft, A backrest frame that moves forward by a link mechanism, wherein the backrest frame is configured to be swingable about a backrest rotation axis at a lower end portion, and the footrest plate is supported by a seat plate support rod via a link mechanism. The seat plate support rod is provided with a connection protrusion, and the connection plate is provided with a guide hole in which the connection protrusion is fitted and guided, and the guide hole is a backrest rotating shaft. From the trajectory of constant radius around It is set so that it comes off, and while rotating the backrest frame backward around the backrest rotation axis,
The chair is changed from the sitting position to the resting position and further to the nap position by projecting the footrest frame in front of the seat plate via the seat plate support rod and the link mechanism.In the nap position, the connection protrusion is provided in the guide hole. A chair having a posture changing function, characterized in that the chair is configured so as to be guided and deviate from a trajectory having a constant radius, and to shift in a state in which a connection state with a seat plate supporting rod is released.