JP6715537B2 - Reclining seat and wheelchair with reclining seat - Google Patents

Description

The present invention relates to a reclining seat and a wheelchair provided with the reclining seat.

BACKGROUND ART Conventionally, there is known a wheelchair that can recline with a simple structure. For example, in Patent Document 1, a reclining mechanism that is arranged behind the back frame and maintains the backrest body at an initial angle or a reclining angle is provided, and the reclining mechanism has a shaft that is rotatably attached to an extending portion that extends rearward of the back frame. A wheelchair is described which comprises a support member which is stopped and supports the backrest from the rear. In this wheelchair, the support member engages with the backrest body at the first position where the support member is placed on the extension portion, the backrest body is maintained at the initial angle, and the support member hangs down from the extension portion. The indicator member can be engaged with the backrest body at the two positions to maintain the backrest body at the reclining angle.

JP, 2016-112162, A

However, the wheelchair described in Patent Document 1 has a problem that a large force is required when reclining the reclining mechanism because the backrest body needs to be pressed strongly when the reclining mechanism is reclining. In particular, a user using a wheelchair often has weak muscle strength, and in such a case, there is a problem that the user cannot recline without the assistance of a helper who assists the use of the wheelchair. ..

The present invention has been made in view of the above problems, and a main object of the present invention is to provide a reclining seat having a reclining mechanism that enables easy reclining when reclining. Moreover, it aims at providing the wheelchair using this reclining seat.

The present invention employs the following means in order to achieve at least one of the above objects.

The reclining seat of the present invention is
A pair of backrest frames that sandwich the backrest portion that supports the back of the user,
A pair of seat surface frames that sandwich the seat surface that supports the buttocks of the user,
A pair of below-the-knee base frames that clamp the lower knee supporting the lower knee of the user,
A pillow attached to the backrest,
A pair of connecting rods respectively connecting the below-knee base frame and the backrest frame,
A pedestal for fixing the backrest frame to be swingable around a center point,
The backrest frame is swingably attached to the mount,
The seat frame is movably attached to the mount,
The below-knee base frame is swingably attached to the seat frame,
In the state where the center point is the intersection point where the extension line of the surface of the backrest portion and the surface extension line of the seat surface intersect at 100°, and the pillow portion and the below-knee base are located on substantially the same plane. When the distance from the distal end of the pillow portion to the distal end of the below-knee rest is an adaptive length, it is located within an adaptive load range,
The adaptive load range is a distance of 7% or more and 14% or less of the adaptation length in the direction of the backrest portion from the origin, and is separated from the surface of the backrest portion by 14% or more and 24% or less of the adaptation length in a right angle direction. A range of
It is a thing.

This reclining seat supports a pair of backrest frames that sandwich the backrest portion that supports the user's back, a pair of seating surface frames that sandwich the seat surface that supports the user's buttocks, and the lower knees of the user. A pair of below-the-knee frames that sandwich the lower knee, a pillow portion attached to the backrest, a pair of connecting rods that respectively connect the below-the-knee frame and the backrest frame, and swingably around a center point. The backrest frame is movably attached to the pedestal, and the seat frame is movably attached to the pedestal, and the center point is the surface of the backrest portion. The distance from the distal end of the pillow to the distal end of the foot rest when the pillow and the below-knee rest are located on substantially the same plane, with the origin at the intersection of the extension and the surface extension of the seat surface. Is an adaptive load range, the adaptive load range is 16% or more and 22% or less of the adaptive length in the direction of the backrest from the origin, and is in a direction perpendicular to the surface of the backrest. In the range of 14% or more and 24% or less of the adaptation length. By doing so, it is possible to reduce the labor required for moving the backrest portion or the like when pressing the backrest portion and reclining. In other words, even if the muscle strength of the user is reduced, he/she can recline easily without requiring the labor of the caregiver.

In the reclining seat of the present invention, the adaptive load range is a distance of 7% or more and 14% or less of an adaptive length from the origin in a direction of the backrest portion, and an adaptive length of 16% in a direction perpendicular to a surface of the backrest portion. It may be characterized in that they are in a range separated by not less than 21% and not more than %. By doing so, it is possible to further reduce the labor required for moving the backrest portion or the like when pressing the backrest portion and reclining. In other words, even if the muscle strength of the user is reduced, he/she can recline easily without requiring the labor of the caregiver.

In the reclining seat of the present invention, the gantry includes a backrest guide rail formed in an arc shape centered on the center point, a pair of rollers that fixes the backrest frame, and is movable on the backrest guide rail. The backrest frame may swing as the roller moves along the guide rail. Even in this case, it is possible to reduce the labor required for moving the backrest when pressing the backrest and reclining. In other words, even if the muscle strength of the user is reduced, he/she can recline easily without requiring the labor of the caregiver.

In the reclining seat of the present invention, the seating surface may be inclined in a direction in which the seating surface becomes lower from the lower knee side toward the backrest side. By doing so, a force is applied to the buttocks of the user in the direction of the backrest due to gravity, and thus the possibility of the user leaving the seat surface can be reduced.

The reclining seat of the present invention may be characterized in that the below-knee base frame forms a parallel link structure with the backrest frame by the seat surface frame and the connecting rod. By doing so, the positional relationship between the below-knee base and the backrest can be kept constant at all times, which is highly convenient when the user reclines while in use.

The reclining seat of the present invention may be provided with a swing restricting portion that restricts swing of the backrest frame. By doing so, it is possible to reduce the swing of the backrest frame that the user does not intend.

The wheelchair of the present invention,
A reclining seat according to any of the above,
Wheels provided on the mount,
Is provided,
It is a thing.

Since the wheelchair of the present invention includes the reclining seat according to any of the above, the same effect as the reclining seat according to any of the above, for example, when the backrest is pressed to recline, the backrest or the like. It is possible to obtain an effect that it is possible to reduce the labor required when moving the.

FIG. 1 is a perspective view showing a schematic configuration of the wheelchair 20. FIG. 2 is a side view showing a schematic configuration of the wheelchair 20 with part of the configuration omitted. FIG. 3 is a side view for explaining a seated state and a tilted state of the wheelchair 20. FIG. 4 is an explanatory diagram for explaining the adaptive load range of the wheelchair 20. FIG. 5 is a list showing the adaptive load range of the wheelchair 20. FIG. 6 is a perspective view showing the outline of the configuration of a wheelchair 120 of another embodiment. FIG. 7 is a side view showing a schematic configuration of the wheelchair 120 with a part of the configuration omitted. FIG. 8 is an explanatory diagram for explaining the operation when the wheelchair 120 reclines.

Next, a wheelchair 20 will be described in detail with reference to FIGS. 1 and 2 as an example of an embodiment of the present invention. Here, FIG. 1 is a perspective view showing the outline of the configuration of the wheelchair 20, and FIG. 2 is a side view showing the outline of the configuration of the wheelchair 20, but a part of the pedestal 60 on the left side and the left side. The rear wheel 66 attached to the side is omitted for the sake of explanation. In addition, in the following description, regarding the positional relationship of each part of the wheelchair 20, the directions of the arrows in FIG. 1 are “forward”, “rearward”, “upward”, “downward”, “rightward”, “leftward”. , Respectively. However, both indicate relative directions, not absolute directions. Further, the embodiments and drawings described below exemplify a part of the embodiments of the present invention, are not used for the purpose of limiting these configurations, and do not depart from the gist of the present invention. The range can be appropriately changed. In addition, the same or similar reference numerals are given to corresponding components in each drawing. In addition, an example of a method of using the reclining seat and the wheelchair of the present invention will be clarified by explaining the operation of reclining the wheelchair 20.

As shown in FIG. 1, a wheelchair 20 that is an example of an embodiment of the present invention includes a pair of backrest frames 30 that sandwich a backrest portion 32 that supports a user's back, and a seating surface that supports a user's buttocks. A pair of seat frame 40 that holds 42, a pair of below-knee frame 50 that holds below-the-knee base 52 that supports the lower knees of the user, a pedestal 60 having front wheels 64 and rear wheels 66, and a head of the user. A pillow portion 34 for supporting the legs and a foot rest portion 54 for supporting the user's foot are provided, and the below-knee base frame 50 and the backrest frame 30 are connected to each other by connecting rods 70. Further, the backrest frame 30 is attached to the pedestal 60 so as to be swingable around the center point 22 (see FIG. 2), and the seat frame 40 is movably attached to the pedestal 60. By so doing, the user can sit down (see FIG. 3A; hereinafter also referred to as “seated state”), by tilting the backrest portion 32 and rotating the below-knee base 52, whereby the backrest portion 32, The reclining can be performed in a state in which the seat surface 42 and the below-knee base 52 are located on substantially the same plane (see FIG. 3B, hereinafter also referred to as “tilted state”).

Here, the position of the center point 22 which is the swing center of the backrest frame 30 will be described in more detail. The center point 22 is a predetermined point included in the adaptive load range. Specifically, an intersection point where an extension line of the surface of the backrest portion 32 and a surface extension line of the seating surface 42 intersect in a seated state (a state where the angle between the surface of the backrest portion 32 and the surface of the seating surface 42 is 100°). Is the origin 24 (see FIG. 4), and the distance from the distal end of the pillow portion 34 to the distal end of the below-knee base 52 in the tilted state is the adaptive length L (see FIG. 3B). It is a position moved from the origin in the direction of the backrest portion 32 by a length of 3% and a position moved from the origin in the direction of the seat surface by a length of 10.6% of the adaptation length L. By doing so, it is possible to reduce the labor required for moving the backrest 32 and the like when pressing the backrest 32 and reclining. In other words, even if the muscle strength of the user is reduced, he/she can recline easily without requiring the labor of the caregiver.

Here, the adaptive load range will be described in more detail with reference to FIGS. 4 and 5. Here, FIG. 4 is a side view of the wheelchair 20, showing the positional relationship between the origin 24 and the center point, and plotting the positions at which the moment load value becomes 6 kilograms or less. .. FIG. 5 is a table showing the calculated values of the moment load at the position of the center point, the upper part shows the distance from the origin in the vertical and horizontal directions, and the lower part shows the origin in the vertical and horizontal directions. The distance from is shown as a ratio to the adaptation length L. Here, the moment load is the same height as the adaptation length as a user, and a humanoid model weighing 60 kilograms is seated in a seated position with the position of each plot as the center point and the backrest 32 of the backrest portion 32 as the center point. The value of the force required when the back end 32 is moved by 15° by pressing the front end is a value calculated by known CAD software. As shown in FIG. 4, the position of the center point 22 is a distance of 3% or more and 16% or less of the adaptation length L in the direction of the backrest portion 32 from the origin 24, and the adaptation length is perpendicular to the surface of the backrest portion. When the distance is within 14% or more and 24% or less, reclining can be easily performed. In other words, even if the muscle strength of the user is reduced, he/she can recline easily without requiring the labor of the caregiver. Regarding the adaptive weight range, for example, the position of the center point 22 is a distance of 7% or more and 14% or less of the adaptive length L in the direction of the backrest portion 32 from the origin 24, and the direction from the origin 24 to the seat surface 42. The distance may be within the range of 16% or more and 21% or less of the adaptation length. By doing so, since the weight is about 12 kg or less, reclining can be easily performed. In other words, even if the muscle strength of the user is reduced, he/she can recline easily without requiring the labor of the caregiver. Further, for example, the position of the center point 22 is a distance of 9% or more and 12% or less of the adaptation length L in the direction of the backrest portion 32 from the origin 24, and 18% or more of the adaptation length in the direction of the seat surface 42 from the origin 24. The distance may be 21% or less. By doing so, since the weight is approximately 6 kg or less, reclining can be easily performed. In other words, even if the muscle strength of the user is reduced, he/she can recline easily without requiring the labor of the caregiver.

Further, since the adaptation length of the user corresponds to the height of the user, when the height of the user is 167 cm, the position of the center point 22 is a distance of 177 mm from the origin 24 toward the backrest portion 32. The optimum value is a position 323 mm away from the surface of the backrest 32. By doing so, reclining can be performed easily. In other words, even if the muscle strength of the user is reduced, he/she can recline easily without requiring the labor of the caregiver. Further, when the height of the user is 167 cm, the adaptive load range of the center point 22 is 117 mm or more and 227 mm or less in the direction from the origin 24 to the backrest portion 32, and 283 mm from the surface of the backrest portion 32. The distance may be 363 mm or less, or 147 mm or more and 207 mm or less in the direction of the backrest 32 from the origin 24, and the position may be 303 mm or more and 353 mm or less from the surface of the backrest 32. May be. By doing so, reclining can be easily performed as in the case described above. In other words, even if the muscle strength of the user is reduced, he/she can recline easily without requiring the labor of the caregiver.

As shown in FIG. 2, the backrest frame 30 is a plate-shaped member having protrusions that protrude from the central portion 31 in three directions: a first protrusion 35, a second protrusion 36, and a third protrusion 37. The center point 22 located at the end of the one protrusion 35 is swingably attached to the pedestal 60 with the swing axis as the swing axis. Further, the backrest 32 is fixed to the end of the second protrusion 36, and can support the back of the user. Further, the center portion 31 is connected to the seat surface frame 40, and the end portion of the third protruding portion 37 is connected to the connecting rod 70, respectively, so that the backrest frame 30 and the below-knee frame 50 are connected by a parallel link structure. There is. By doing so, a constant angle can be maintained when the backrest portion 32 and the below-knee base 52 rotate.

The backrest portion 32 is a material having elasticity on one surface side (left side in FIG. 2) and has a shape in which the central portion is recessed, and the pillow portion 34 is movably attached to the distal end side. ing. In this way, by making the one surface side a material having an elastic body in which the central portion is recessed, the user can be naturally guided to the central portion when supporting the back of the user, so that the user can Can be used comfortably.

The pillow portion 34 is a material having elasticity on one surface side (left side in FIG. 2), has a shape with a recessed central portion, and is movably attached to the backrest portion 32. By doing so, by moving the pillow portion 34 toward or away from the backrest portion 32, the position of the pillow portion 34 can be adjusted according to the body shape of the user, so that the user is comfortable. Can be used. In addition, by using a material that has an elastic body with a concave shape in the central part on one surface side, it is possible to guide the user to the central part when supporting the head of the user, so that the user is comfortable. Can be used for

The seat surface frame 40 includes a seat surface 42 and a pair of rollers 44, and the pair of rollers 44 are movably attached along a seat surface guide rail 62 (see FIG. 1) provided on the frame 60. The one end side is rotatably attached to the central portion 31 of the backrest frame 30, and the other end side is rotatably attached to the below-knee base frame 50. By doing so, when reclining the backrest 32, it is possible to move along the seat surface guide rail 62 with the movement of the backrest 32, and to rotate the below-knee base frame 50 with the movement. Can be comfortably used by the person.

The below-knee base frame 50 is a substantially triangular plate-like member having a first apex portion 51, a second apex portion 53, and a third apex portion 55, and the seat frame 40 and the second apex portion at the first apex portion 51. It is rotatably attached to the connecting rod 70 at the portion 53. By doing so, when reclining, the below-knee base 52 can rotate with the rotation of the backrest portion 32 and the movement of the seat surface 42.

The below-knee base 52 is a material having elasticity on one surface side (the left side in FIG. 2) and has a shape in which the central portion is recessed, and the footrest portion 54 is movable on the distal end side. It is installed in. In this way, by using a material having an elastic body with a concave shape in the central portion on one surface side, the user can be naturally guided to the central portion when supporting the lower knee of the user. Can be used comfortably. Further, since the footrest portion 54 is attached so as to be movable toward and away from the below-knee base 52, the position of the footrest portion 54 can be adjusted according to the physical constitution of the user. By doing so, the user can use it comfortably.

The pedestal 60 is a pedestal portion of the wheelchair 20 to which wheels (front wheels 64 and rear wheels 66) are attached, and has seat surface guide rails 62 on both side surfaces. The seat surface guide rail 62 is provided so as to be inclined so that the front side is higher than the rear side. By doing so, the front side of the seat surface 42 becomes higher than the rear side, so that the user's buttocks are subjected to gravity in the direction of the backrest portion 32, and the possibility of the user leaving the seat surface 42 is obviated. It can be reduced. Further, on the right side of the pedestal 60, a rocking restricting portion 80 for restricting the movement of the backrest frame 30 is provided, which reduces the possibility that the backrest frame 30 unintentionally rotates. In addition, by restricting the movement of the backrest frame 30, it is possible to reduce the possibility of reclining that the user does not intend.

One end of the connecting rod 70 is the end of the third protruding portion 37 of the backrest frame 30, and the other end is the end of the second apex portion 53 of the below-knee base frame 50. It is a member. By providing the connecting rod 70, the backrest frame 30 and the below-knee base frame 50 are connected by the connecting rod 70 and the seat surface frame 40 in a parallel link structure, so that the backrest frame 30 is swung. At this time, regardless of the position of the backrest frame 30, the backrest frame 30 and the below-knee frame 50 are kept at a constant angle. In addition, since the backrest 32 and the below-knee base 52 are always maintained in a state of being substantially parallel to each other, the user can comfortably use them.

The rocking|fluctuation regulation part 80 is a well-known regulation member which regulates the movement of the backrest part 32 with respect to the gantry 60, for example, the operation lever 81 connected via a pin and a wire not shown is provided in one side surface of the gantry 60. This unillustrated pin is inserted into an unillustrated pin hole provided in the pedestal 60 to restrict the swing of the backrest portion 32, and the backrest portion 32 can be swung by being removed from the pin hole. To do. Specifically, since the pin (not shown) is biased in the pin hole direction by a biasing member (not shown), when the user grips the operation lever 81, the pin is released from the pin hole and the backrest portion 32 is removed. It becomes possible to swing. In this state, when the backrest portion 32 is moved to a predetermined position and the operation lever 81 is released, the pin is inserted into the pin hole by the biasing member (not shown), and the swinging of the backrest portion 32 is restricted. By doing so, the backrest portion 32 can swing only while the user holds the handle portion, so that the possibility of swinging the backrest portion 32 against the user's will is reduced. be able to.

Next, the reclining operation of the wheelchair 20 will be described in detail with reference to FIG. Here, FIG. 3 is an explanatory view for explaining the reclining operation of the wheelchair 20, FIG. 3A shows a seated state, and FIG. 3B shows a tilted state. Further, in the following description, the reclining operation from the seated state to the tilted state will be described, but the reclining operation may be stopped at any arbitrary position between the seated state and the tilted state, or may be stopped at any position. The reclining operation may be performed from the seated state to the seated state or the tilted state. In either case, the reclining operation can be performed by the same operation.

First, when reclining from the seated state to the tilted state, the handle portion of the swinging restricting portion 80 is gripped. This makes the backrest 32 movable. Then, the backrest portion 32 is pressed backward. Specifically, the user sitting on the wheelchair 20 pushes backward with his back or the like, and the caregiver pushes the backrest portion 32 backward. Thus, the backrest frame 30 rotates clockwise around the center point 22 as the backrest portion 32 rotates backward, and the seat frame 40 moves forward with the rotation of the backrest frame 30. Moving in the same direction, the connecting rod 70 moves in the forward direction, the knee frame 50 rotates clockwise with the movement of the seat frame 40, and the knee frame 52 rotates with the rotation of the knee frame 52. Rotates. As described above, since the backrest frame 30 and the below-knee frame 50 are connected to each other by the seat frame 40 and the connecting rod 70 in the parallel link structure, when the backrest 32 rotates, the surface of the backrest 32 and the below-knee platform. The surface of 52 can be reclined with the angle kept constant, and can be comfortably used by the user.

After pressing the backrest portion 32 to move it to a desired position, the user releases the handle portion of the rocking restricting portion 80. When the handle portion is released, the movement of the backrest portion 32 is restricted. By doing so, it is possible to reduce the possibility that the backrest portion 32 will move against the intention of the user.

On the other hand, when reclining from the tilted state to the seated state, the user presses the lower portion of the below-knee platform 52 backward. When the lower part of the below-knee base 52 is pressed backward, the below-knee base 52 rotates counterclockwise and the below-knee base frame 50 also rotates counterclockwise, and the knee lower base frame 50 is connected with the rotation of the below-knee base frame 50. The bar 70 moves rearward, the seat frame 40 moves rearward, and the backrest frame 30 rotates counterclockwise. In this way, since the backrest frame 30 and the below-knee frame 50 are connected to each other by the seat frame 40 and the connecting rod 70 by the parallel link structure, when the below-knee table 52 rotates, the surface of the backrest portion 32 and the below-knee table 50. The surface of 52 can be reclined with the angle kept constant, and can be comfortably used by the user.

After pressing the lower part of the below-knee base 52 to move it to a desired position, the user releases the handle portion of the swinging restricting portion 80. When the handle portion is released, the movement of the backrest portion 32 is restricted. By doing so, it is possible to reduce the possibility that the backrest portion 32 will move against the intention of the user.

Subsequently, a wheelchair 120 according to another embodiment will be described in detail with reference to FIGS. 6 to 8. Here, FIG. 6 is a perspective view showing an outline of the configuration of the wheelchair 120 of another embodiment, and FIG. 7 is a side view showing an outline of the configuration of the wheelchair 120, omitting a part of the configuration. Yes, FIG. 8 is an explanatory view for explaining the seated state and the tilted state of the wheelchair 120, FIG. 8A showing the seated state, and FIG. 8B showing the tilted state. The same parts as those of the wheelchair 20 are designated by the corresponding reference numerals, and the description thereof will be omitted here.

As shown in FIG. 6, the wheelchair 120 according to another embodiment has a backrest portion 132 that supports the user's back, a pillow portion 134 that supports the user's head, and a backrest guide rail 168 provided on the pedestal 160. A pair of backrest frames 130 having a pair of rollers 139 for moving the user, a pair of seat surface frames 140 having a seat surface 142 supporting the buttocks of the user, a below-the-knee base 152 supporting the lower knees of the user, and the user. The below-knee base frame 150 and the backrest frame 130 are provided with a pair of below-knee base frames 150 having the foot rests 154 supporting the above-mentioned feet and a pedestal 160 having the front wheels 164, the rear wheels 166 and the backrest guide rails 168. The rods 170 are connected to each other. By doing so, the user can sit down (see FIG. 8A, hereinafter also referred to as “seated state”), and the backrest portion 132 is tilted and the below-knee base 152 is rotated, whereby the backrest portion 132, The seat surface 142 and the below-knee base 152 can be reclined in a state in which they are located on substantially the same plane (see FIG. 8B, hereinafter also referred to as “tilted state”).

The pedestal 160 is a pedestal portion of the wheelchair 120 to which a front wheel 164 and a rear wheel 166 are attached, and includes a seat surface guide rail 162 and a backrest guide rail 168 on both side surfaces, respectively. The seat surface guide rail 162 is provided so as to be inclined so that the front side is higher than the rear side. By doing so, the front side of the seat surface 142 becomes higher than the rear side, and the user's buttocks are subjected to force in the direction of the backrest 132 due to gravity, which may cause the user to leave the seat surface 142. It can be reduced in advance. Further, since the backrest guide rails 168 are formed on both side surfaces of the pedestal 160 in a substantially arcuate shape with the center point 122 as the center, the backrest guides 168 move along the backrest guide rails 168 and the backrest guide rails 168 move. The part 132 can rotate. Further, on the right side of the pedestal 160, a swing restricting portion 180 for restricting the movement of the backrest frame 130 is provided, which reduces the possibility that the backrest frame 130 may unintentionally rotate. In addition, by restricting the movement of the backrest frame 130, it is possible to reduce the possibility of reclining that the user does not intend.

Here, the center point 122, which is the center point of the circular arc shape of the backrest guide rail 168, will be described in more detail. The center point 122 is, like the center point 22, an intersection point where an extension line of the surface of the backrest portion 132 and a surface extension line of the seat surface 142 in the tilted state intersect with each other as an origin 124, and from the distal end of the pillow portion 134 in the tilted state. When the distance to the distal end of the below-knee base 152 is the adaptive length L, the distance is 19.3% of the adaptive length L in the direction of the backrest portion 132 from the origin, and the adaptive length is in the direction of the seat surface from the origin 124. It is located at a distance of 10.6%. By doing so, it is possible to reduce the labor required for moving the backrest 132 and the like when pressing the backrest 132 for reclining. In other words, even if the muscle strength of the user is reduced, he/she can recline easily without requiring the labor of the caregiver. Note that the adaptive weighting range is the same as that of the center point 22, and therefore its description is omitted here.

In the wheelchair 120, the backrest frame 130, the seat surface frame 140, the below-knee frame 150, the connecting rod 170, and the rocking restricting portion 180 are used as the backrest frame 30, the seat frame 40, the below-knee frame 50, the connecting rod 70 of the wheelchair 20. Since it is the same as the rocking|fluctuation control part 80, respectively, description is abbreviate|omitted here.

Next, the reclining operation of the wheelchair 120 will be described in detail with reference to FIG. Here, FIG. 8 is an explanatory view for explaining the reclining operation of the wheelchair 120, FIG. 8A shows a seated state, and FIG. 8B shows a tilted state. Further, in the following description, the reclining operation from the seated state to the tilted state will be described, but the reclining operation may be stopped at any arbitrary position between the seated state and the tilted state.

First, when reclining from the seated state to the tilted state, the handle portion of the swing restricting portion 180 is gripped. This makes the backrest 132 movable. Then, the backrest 132 is pressed backward. Specifically, the user sitting on the wheelchair 120 pushes the back or the like backward, or the caregiver pushes the backrest 132 backward. In this way, as the backrest portion 132 rotates backward, the pair of rollers 139 moves forward along the seat guide rail 162 as the backrest frame 130 rotates, and the backrest frame 130 moves. The seat surface frame 140 moves rearward and the connecting rod 170 moves frontward as the seat surface frame 140 moves, and the below-knee base frame 150 rotates clockwise as the seat surface frame 140 moves. As the below-knee base frame 150 rotates, the below-knee base 152 rotates. As described above, since the backrest frame 130 and the below-knee base frame 150 are connected to each other by the seat frame 140 and the connecting rod 170 by the parallel link structure, when the backrest 132 rotates, the surface of the backrest 132 and the below-knee base. It is possible to recline while keeping the surface angle of 152 constant, and the user can comfortably use it.

After pressing the backrest portion 132 to move it to a desired position, the user releases the handle portion of the swing restricting portion 180. When the handle portion is released, the movement of the backrest portion 132 is restricted. By doing so, it is possible to reduce the possibility that the backrest portion 132 will move against the intention of the user.

On the other hand, when reclining from the tilted state to the seated state, the user pushes the lower portion of the below-knee base 152 backward. When the lower part of the below-knee base 152 is pressed backward, the below-knee base 152 rotates counterclockwise and the below-knee base frame 150 also rotates counterclockwise, and the lower knee base frame 150 is connected with the rotation of the below-knee base frame 150. The bar 170 moves rearward, the seat frame 140 moves rearward, and the backrest frame 130 rotates counterclockwise. In this way, since the backrest frame 130 and the below-knee frame 150 are connected by the parallel link structure by the seat frame 140 and the connecting rod 170, when the below-knee block 152 rotates, the surface of the backrest portion 132 and the below-knee block are combined. It is possible to recline while keeping the surface angle of 152 constant, and the user can comfortably use it.

After pressing the lower part of the below-knee base 152 to move it to a desired position, the user releases the handle part of the rocking restricting portion 180. When the handle portion is released, the movement of the backrest portion 132 is restricted. By doing so, it is possible to reduce the possibility that the backrest portion 132 will move against the intention of the user.

According to the wheelchair 20 or the wheelchair 120 of the embodiment described in detail above, since the center point 22 or the center point 122 is located within the adaptive load range, when the backrest portion 32 or the backrest portion 132 is pressed to recline, the backrest. The labor required when moving the part 32 or the backrest part 132 can be reduced. In other words, even if the muscle strength of the user is reduced, he/she can recline easily without requiring the labor of the caregiver.

Further, since the seat surface 42 and the seat surface 142 are inclined in a direction in which the seat surface 42 and the seat surface 142 become lower from the side of the below-knee base 52 or the side of the below-knee base 152 to the side of the backrest portion 32 or the backrest portion 132, the user's buttocks are backed by the gravity. Since a force is applied in the direction of 32 or the backrest 132, the possibility of the user leaving the seat surface can be reduced.

Furthermore, since the seat back frame 40 and the connecting rod 70 form a parallel link structure between the backrest frame 30 and the below-knee base frame 50, the positional relationship between the backrest portion 32 and the below-knee base 52 can always be kept constant. , High user convenience. Similarly, since the seat back frame 140 and the connecting rod 170 form a parallel link structure between the backrest frame 130 and the below-knee base frame 150, the positional relationship between the backrest 132 and the below-knee base 152 is always kept constant. It is possible and convenient for the user.

Furthermore, since the rocking|fluctuation control part 80 or the rocking|fluctuation control part 180 is provided, a user can reduce the possibility that the backrest frame 30 or the backrest frame 130 may rock unintentionally.

Needless to say, the present invention is not limited to the above-described embodiments, and can be carried out in various modes within the technical scope of the present invention.

For example, in the above-described embodiment, the wheelchair 20 and the wheelchair 120 are described as an example, but the same applies to various modes as long as the position of the center point 22 or the center point 122 is within the adaptive load range. The effect can be obtained.

In the above-described embodiment, the pillow portion 34 is attached to the backrest portion 32, but if the backrest portion 32 has a size capable of supporting the head, the backrest portion 32 may also serve as the pillow portion 34. good. By doing so, the same effect as that of the above-described embodiment can be obtained.

In the above-described embodiment, the rocking|fluctuation control part 80 was provided in one side of the gantry 60, However, the rocking|fluctuation control part 80 may be provided in a place which a user cannot operate, or one side of the gantry 60. In addition to this, it may be further provided in a place where the user cannot operate. This allows a third party to regulate the reclining for the safety of the user.

As shown in the above-mentioned embodiment, it can be used in the field of care, particularly as a wheelchair.

20... Wheelchair, 22... Center point, 24... Origin point, 30... Backrest frame, 31... Central part, 32... Backrest part, 34... Pillow part, 35... First protruding part, 36... Second protruding part, 37... No. Three protruding parts, 40... Seat frame, 42... Seat surface, 44... Roller, 50... Below knee frame, 51... First apex part, 52... Below knee stand, 53... Second apex part, 54... Foot rest part, 55... Third apex part, 60... Stand, 62... Seating surface guide rail, 64... Front wheel, 66... Rear wheel, 70... Connecting rod, 80... Swing control part, 81... Operation lever, 120... Wheelchair, 122... Central point, 124... Origin, 130... Back frame, 132... Backrest part, 134... Pillow part, 139... Roller, 140... Seat frame, 142... Seat surface, 150... Knee rest frame, 152... Knee rest, 154... Foot rests, 160... Frame, 162... Seat guide rails, 164... Front wheels, 166... Rear wheels, 168... Backrest guide rails, 170... Connecting rods, 180... Swing restricting portions.

Claims (7)

A pair of backrest frames that sandwich the backrest portion that supports the back of the user,
A pair of seat surface frames that sandwich the seat surface that supports the buttocks of the user,
A pair of below-knee base frames for sandwiching the below-knee base that supports the lower knee of the user,
A pillow attached to the backrest,
A pair of connecting rods respectively connecting the below-knee base frame and the backrest frame,
A pedestal for fixing the backrest frame to be swingable around a center point,
The backrest frame is swingably attached to the mount,
The seat frame is movably attached to the mount,
The below-knee base frame is swingably attached to the seat frame,
In the state where the center point is the intersection point where the extension line of the surface of the backrest portion and the surface extension line of the seat surface intersect at 100°, and the pillow portion and the below-knee base are located on substantially the same plane. When the distance from the distal end of the pillow portion to the distal end of the below-knee rest is an adaptive length, it is located within an adaptive load range,
The adaptive load range is a distance of 3% or more and 16% or less of the adaptive length in the direction of the backrest portion from the origin, and is separated from the surface of the backrest portion by 14% or more and 24% or less of the adaptive length in a right angle direction. Is within the range,
Reclining seat. The adaptive load range is a distance of 7% or more and 14% or less of the adaptation length in the direction of the backrest portion from the origin, and is separated from the surface of the backrest portion by 16% or more and 21% or less of the adaptation length in a right angle direction. A range of
The reclining seat according to claim 1. The gantry has a backrest guide rail formed in an arc shape centered on the center point, and a pair of rollers that fix the backrest frame and are movable on the backrest guide rail. The backrest frame swings along with movement along the backrest guide rail,
The reclining seat according to claim 1 or 2. The seating surface is inclined in a direction in which the seating surface becomes lower from the lower knee side toward the backrest side.
The reclining seat according to any one of claims 1 to 3. The below-knee base frame has a parallel link structure with the backrest frame by the seat frame and the connecting rod.
The reclining seat according to any one of claims 1 to 4. The reclining seat according to any one of claims 1 to 5,
A swing restricting portion that restricts swing of the backrest frame,
Is provided,
Reclining seat. A reclining seat according to any one of claims 1 to 6,
Wheels provided on the mount,
Is provided,
wheelchair.

Images