JP6870952B2 - Lifting chair - Google Patents

Description

The present invention relates to an elevating seat chair that can freely raise and lower the seat surface.

Traditionally, sitting chairs, which are mainly used in Japanese-style rooms with tatami mats, have a seating surface close to the floor, which puts a heavy burden on the knees and hips when standing up or sitting down. Therefore, various chairs and seat chairs have been conventionally proposed in which the burden on the waist and knees is reduced by adjusting (elevating) the height of the seat surface.

For example, Patent Document 1 below discloses a sitting chair in which a lifting mechanism made of a pantograph is provided on the lower surface of the chair body, and the chair body is lifted and lowered by this lifting mechanism. Further, in Patent Document 2 below, the base plate on which the seat portion is installed and the link installation base plate are connected by a plurality of X-axis-shaped link mechanisms, and the link mechanism is driven by a motor to drive the seat portion installation base. A seat height adjustable chair that raises and lowers the board is disclosed.

Jitsukaisho 60-322922 Japanese Unexamined Patent Publication No. 2005-205117

By the way, in the sitting chair as shown in Patent Document 1, when the user stands up, the user himself manually raises the chair body by rotating the lever or the like, so that the operation is easy. Not. On the other hand, in the seat height adjustable chair as shown in Patent Document 2, since the seat installation base is moved up and down by a motor, it can be moved up and down relatively easily, but it is not easy to get on and off when ascending, and it is also possible to sit down. The stability is not high.

Therefore, the present invention has been devised to solve these problems, and its main purpose is to provide a new elevating seat chair that is easy to get on and off and has excellent stability when seated. It is in.

In order to solve the above-mentioned problems, the first invention includes a seat chair portion and an elevating portion for raising and lowering the seat chair portion, and when the elevating portion is located below the seat chair portion, a bottom plate is provided. A pair of X-axis link members that support and connect the seat chair portion and the bottom plate up and down, and a motor that moves the X-axis link member up and down via a ball screw mechanism are provided. The members are a first link shaft extending from the front side of the seat chair portion in the seating direction to the rear side of the bottom plate, and a second link extending from the rear side of the seat chair portion in the seating direction to the front side of the bottom plate. The chair is provided with a shaft, and one or both of the first link shaft and the second link shaft are characterized in that the seating direction front side of the seat chair portion is shorter than the rear side of the crossing shaft. It is an elevating chair.

According to such a configuration, when the seat chair portion is lowered by the elevating portion, the seat chair portion is substantially horizontal to the bottom plate, so that the seat can be stably seated. Then, when the seat chair portion rises from this state, the seat chair portion inclines so that the front side in the seating direction is lower than the rear side, so that the seat chair portion can be smoothly boarded and disembarked. It can be carried out.

The second invention is characterized in that, in the first invention, the support point on the bottom plate side of the first link shaft is located lower than the support point on the bottom plate side of the second link shaft. It is an elevating seat chair. According to such a configuration, when the seat chair portion is lowered, the front side in the seating direction is higher than the rear side and the entire seat chair portion is slightly tilted backward, so that there is a possibility that the seat chair portion slides forward when seated. It becomes lower and you can sit in a more stable state.

In the third invention, in the first or second invention, the support point on the seat chair portion side of the second link shaft is the support point of the first link shaft with respect to the thickness direction of the seat chair portion. It is an elevating seat chair characterized in that it is located at a position higher than the support point on the seat chair portion side. Even with such a configuration, as in the second invention, when the seat chair portion is lowered, the front side in the seating direction is higher than the rear side and the entire seat chair portion is slightly inclined rearward, so that the seat is seated. Sometimes it is less likely to slip forward and you can sit in a more stable state.

In the fourth invention, in the first invention, one end of the first link shaft is pivotally supported on the rear side of the bottom plate in the seating direction, and the other end supports the seat chair portion via a rotating wheel. In addition, the elevating seat chair is characterized in that the diameter of the rotating wheel is such that the front side of the seat chair portion in the seating direction is higher than the rear side thereof when the seat chair portion is lowered. is there. Even with such a configuration, as in the second invention, when the seat chair portion is lowered, the front side in the seating direction is higher than the rear side and the entire seat chair portion is slightly inclined rearward, so that the seat is seated. Sometimes it is less likely to slip forward and you can sit in a more stable state.

A fifth invention is an elevating seat chair according to any one of the first to fourth inventions, characterized in that a rotary table is provided under the bottom plate. According to such a configuration, since the seat chair portion can be freely turned in the left-right direction, getting on and off the seat chair portion becomes easier.

In the elevating chair of the present invention, when the chair is lowered by the elevating part, the seating surface of the chair is substantially horizontal to the bottom plate or tilted backward, so that the chair can be seated stably. it can. Then, when the seat chair portion rises from this state, the seat chair portion tilts forward so that the front side in the seating direction is lower than the rear side, so that getting on and off the seat chair portion is smooth. Can be done.

It is a perspective view which shows one Embodiment of the elevating seat chair 100 which concerns on this invention. It is a top view which shows one Embodiment of the elevating seat chair 100 which concerns on this invention. It is a side view which shows one Embodiment of the elevating seat chair 100 which concerns on this invention. It is a front view which shows one Embodiment of the elevating seat chair 100 which concerns on this invention. It is a side view which shows the structure of the elevating part 20. (A) is an explanatory view showing a state in which the seat chair portion 10 is lowered, and (B) is an explanatory diagram showing a state in which the seat chair portion 10 is raised. It is a partially enlarged view which shows the S part in FIG. It is a vertical sectional view which shows the structure of the accordion type curtain which constitutes the protective cover 28. It is a bottom view which shows the structure of a rotary table 30. (A) is an enlarged cross-sectional view taken along the line AA in FIG. 9, and (B) is an enlarged cross-sectional view taken along the line BB in FIG. It is explanatory drawing which shows the operation and operation of the elevating seat chair 100 which concerns on this invention. It is a side view which shows the other embodiment. It is a block diagram which shows the main part of the embodiment shown in FIG. It is a side view which shows the other embodiment. It is a block diagram which shows the main part of the embodiment shown in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows an embodiment of the elevating seat chair 100 according to the present invention. As shown in the figure, the elevating seat chair 100 includes a seat chair portion 10 for a person to sit on, an elevating portion 20 for raising and lowering the seat chair portion 10, and the elevating portion 20 together with the seat chair portion 10. It is mainly composed of a rotary table 30 to be rotated.

First, the seat chair portion 10 is formed on a substantially rectangular seat plate 11, a seat surface 12 for a person to sit on, a back surface 13 for supporting the waist of the seated person, and armrests for supporting both elbows of the seated person. It is composed of 14 and 14. The shapes of the seat plate 11, the seat 12 and the back surface 13 are not limited to these, and may be circular or other shapes, or the armrests 14 and 14 may be omitted. good.

On the other hand, the elevating part 20 has a configuration as shown in FIGS. 2 to 4. Here, FIG. 2 is a plan view of the elevating portion 20 in which the seat chair portion 10 is seen through, FIG. 3 is a side view thereof, and FIG. 4 is a front view thereof. As shown in the figure, the elevating portion 20 includes a circular top plate 21 integrated with the seat chair portion 10 to support the seat chair portion 10, a circular bottom plate 22 having substantially the same size as the top plate 21, and these ceilings. From a pair of X-axis link members 23, 23 that support and connect the plate 21 and the bottom plate 22 up and down at four points, and a motor 25 that moves the X-axis link members 23, 23 up and down via a ball screw mechanism 24. It is mainly composed.

The X-axis link member 23 is composed of a first link shaft 23a and a second link shaft 23b each having a metal flat bar shape (flat bar), and each of the link shafts 23a and 23b is X-shaped. It is formed so as to intersect in a shape, support the intersection as an axis, and rotate around the intersection. One ends of the link shafts 23a and 23b are pivotally supported by the ends of the top plate 21 and the bottom plate 22, respectively, and the other ends are formed on the top plate 21 and the bottom plate 22 via the rotating wheels 23c and 23d, respectively. It is freely supported along the upper rails 21a and 21a and the lower rails 22a and 22a.

That is, as shown in FIG. 5, the lower end side of the first link shaft 23a of the X-axis link member 23 is rotatably supported (support point: P2) at the rear end (rear in the seating direction) of the bottom plate 22. At the same time, the upper end side thereof is supported on the top plate 21 side (support point: P1) so as to be able to travel along the upper rail 21a provided on the front end side in the seating direction of the top plate 21 via the rotating wheel 23d. On the other hand, on the contrary, the upper end side of the second link shaft 23b is rotatably supported by the rear end (rear in the seating direction) of the top plate 21 (support point: P3), and the lower end side thereof is a rotating wheel. It is supported on the bottom plate 22 side (support point: P4) so as to be able to travel along the lower rail 22a provided on the front side of the bottom plate 22 in the seating direction via the 23c.

Further, in the X-axis link member 23, the length of the first link shaft 23a is shorter than that of the second link shaft 23b. That is, as shown in the figure, of the lengths from the intersection axis P5 of the first link shaft 23a and the second link shaft 23b to the support points P1, P2, P3, and P4 of the link shafts 23a and 23b, the first link. The length L2 between the intersection axis P5 and the support point P2 of the shaft 23a, the length L3 between the intersection axis P5 and the support point P3 of the second link shaft 23b, and the length L4 between the intersection axis P5 and the support point P4 are All are the same (L2 = L3 = L4), but only the length L1 between the intersection axis P5 of the first link axis 23a and the support point P1 is several cm shorter than the other lengths L2, L3, and L4. (L2 = L3 = L4> L1).

The support points P1, P2, P3, and P4 are at the same height position with respect to the height direction (thickness direction) of the top plate 21 and the bottom plate 22. Therefore, as shown in FIG. 6A, when the top plate 21 is lowered, the top plate 21 is substantially parallel to the bottom plate 22 and the seat surface 12 of the seat chair portion 10 is substantially horizontal. However, as shown in FIG. 3B, when the top plate 21 is raised, the seat surface 12 of the seat chair portion 10 on the top plate 21 is slightly tilted forward in the seating direction (forward tilt). It has become.

Next, as shown in FIGS. 3 and 4, the ball screw mechanism 24 includes a ball screw 25b coaxially connected to the output shaft 25a of the motor 25 via a joint 24a, and a nut member 25c screwed into the ball screw 25b. It is mainly composed of. The ball screw 25b is pivotally supported on the bottom plate 22 by a thrust bearing 25d, and rotates in synchronization with the rotation of the output shaft 25a of the motor 25.

The nut member 25c reciprocates along the axial direction of the ball screw 25b as the ball screw 25b rotates, and the pair of X-axis link members 23, 23 are connected via connecting shafts 25e, 25e extending to the left and right of the nut member 25c. The rotating wheels 23c and 23c provided on the lower end side of the two-link shafts 23b and 23b are pivotally supported, respectively.

The motor 25 is a geared motor in which a motor body and a gear head are combined, and an arbitrary rotation speed can be obtained depending on the gear ratio of the gear head. Then, the motor is rotated by a household power source (50 Hz, 100 V), and the ball screw 25b is rotationally driven by the rotational force obtained by reducing the rotation speed from the output shaft 25a and amplifying the torque. As shown in FIG. 2, a remote controller R for controlling the motor 25 is connected to the motor 25, and the rotation direction (vertical movement) and stop thereof can be arbitrarily controlled by the remote controller R.

Then, for example, when the motor 25 is driven in the forward direction, the ball screw 25b interlocking with the ball screw 25b rotates, and the nut member 25c screwed therein moves in the direction of the motor 25 along the ball screw 25b. Then, the second link shafts 23b and 23b of the X-axis link member 23 connected to the nut member 25c via the rotating wheels 23c and 23c rotate so as to stand up, thereby raising the seat chair portion 10.

On the contrary, when the motor 25 is driven in the opposite direction from this position, the ball screw 25b interlocking with the ball screw 25b rotates and the nut member 25c moves in the direction away from the motor 25 along the ball screw 25b. Then, the first link shafts 23a and 23a of the X-axis link member 23 connected to the nut member 25c via the rotating wheels 23c and 23c rotate so as to fall, and the seat chair portion 10 is lowered by this. It has become.

On the other hand, the top plate 21 and the bottom plate 22 constituting the elevating portion 20 are provided with flexible protective frames 26 and 27 along their outer edges, respectively. As shown in FIG. 7, the protective frames 26 and 27 are composed of a ring-shaped rubber body having a C-shaped cross section with the inner peripheral side open, for example, a rubber tire of a bicycle, and are formed on the outside of the top plate 21 (and the bottom plate 22). It is attached so as to cover the frame body 26a provided so as to project from this. The protective frames 26 and 27 may be made of a cushioning material such as urethane foam having the same shape in addition to the rubber tire.

Further, the space between the upper and lower protective frames 26 and 27 is covered with an elastic protective cover 28 so as to cover the inside thereof. The protective cover 28 is composed of, for example, a tubular accordion-shaped curtain that can be expanded and contracted in the vertical direction as shown in FIG. This accordion type curtain has a structure in which, for example, a frame 28b made of a spiral PVC tube or the like is provided inside a cloth body 28a sewn into a tubular shape. Therefore, as shown in FIG. 3B, the cloth 28a can be alternately folded in an accordion shape as the frame 28b expands and contracts up and down, and can be expanded as shown in FIG. ..

As shown in FIGS. 9 and 10, the rotary table 30 is composed of a fixing plate 30a arranged on the floor surface and a tray-shaped rotary plate 30b on which the bottom plate 22 of the elevating portion 20 is placed. These are stacked one above the other so as to face each other, and the central portion thereof is pivotally supported by a shaft nut 30c. A plurality of bearings 30d (8 in the present embodiment) are arranged at equal intervals on the peripheral edge of the fixing plate 30a, and the rotating plates 30b are located on the bearings 30d, 30d ... The rotating plate 30b rotates smoothly in an arbitrary direction around the shaft nut 30c. The fixing plate 30a is reinforced by a frame 30e having a U-shaped cross section provided so as to cross the center thereof.

As shown in FIGS. 11A and 11B, the elevating chair 100 of the present invention having such a configuration first has its seat operated by a remote controller R such as a person seated on the chair portion 10. The chair portion 10 can be raised and lowered to any height. As a result, in normal times, for example, when it is in a kotatsu, it is used with the seat chair portion 10 lowered to the bottom as shown in the figure (B), but when it stands up, it is used in the figure (B). As shown in A), by raising the seat chair portion 10 as it is to form a normal chair, it is possible to easily stand up without imposing a burden on the knees and hips.

Further, when sitting, as shown in FIG. 3A, the chair portion 10 is raised to form a normal chair, and then the chair portion 10 is seated in the same state as shown in FIG. If the seat chair portion 10 is lowered to the lowermost portion as shown in the above, it is possible to easily sit near the floor surface without imposing a burden on the knees and hips.

Further, as shown in FIG. 6A, when the seat chair portion 10 is lowered by the elevating portion 20, the seat chair portion 10 is substantially horizontal to the bottom plate 22, so that the seat can be seated stably. .. Then, as shown in FIGS. 6B and 5, when the seat chair portion 10 is raised from this state, the seat surface 12 of the seat chair portion 10 is on the rear side in the seating direction. It will be in an inclined state so that it will be lower than. As a result, the buttocks can be slid to move away from or sit on the seat surface 12, so that the seat chair portion 10 can be smoothly boarded and disembarked.

Further, since the elevating seat chair 100 of the present invention includes the rotary table 30 under the bottom plate 22, the seat chair portion 10 is oriented in an arbitrary direction as shown in FIGS. 11C and 11D. It can be rotated at any angle. Therefore, for example, when standing up from the kotatsu, the seat chair portion 10 is swiveled to the left by about 90 ° from the kotatsu (not shown) direction as shown in the figure (C) as shown in the figure (B). After that, as shown in FIG. 3D, the seat chair portion 10 can be easily raised to get out of the kotatsu and stand up. When entering the kotatsu, you can easily sit down without straining your knees or hips by performing the opposite operation.

Further, since the chair portion 10 can be easily swiveled in an arbitrary direction while sitting, the direction can be changed extremely easily even when various operations are performed while sitting. Further, since the top plate 21 and the bottom plate 22 are circular, the elevating portion 20 has no corners, so that a part of the body does not hit the elevating portion 20 and the seat chair portion 10 rotates smoothly. Can be done.

Further, since the elevating seat chair 100 of the present invention is provided with flexible protective frames 26 and 27 along the outer edges of the top plate 21 and the bottom plate 22 constituting the elevating portion 20, for example, the seat chair portion. Even if limbs or objects are located between the top plate 21 and the bottom plate 22 when the 10 is lowered, the protective frames 26 and 27 function as cushioning materials (cushions), so that the limbs and fingers can be placed between the top plate 21 and the bottom plate 22. It will not cause injury if pinched. Further, even if a limb or a part of the body is hit against the elevating chair 100, the surrounding area is covered with the protective frames 26 and 27, so that the chair is not injured.

Further, in the elevating seat chair 100 of the present invention, the upper and lower protective frames 26 and 27 are covered with a protective cover 28 made of an elastic accordion type curtain, so that the limbs and limbs are formed between the top plate 21 and the bottom plate 22. Objects, pets, etc. will not get in, and they will not be caught between them. Further, even if it is sandwiched, the flexible protective frames 26 and 27 are not injured by being appropriately deformed, and the ascending / descending movement can be safely repeated. Further, by making the protective cover 28 an accordion type curtain, the cover does not hang down when descending, and the appearance is improved.

Next, FIGS. 12 to 15 show another embodiment of the elevating seat chair 100 according to the present invention, which is devised to further enhance the stability when seated. Therefore, in the present embodiment, as shown in FIG. 12, the position of the shaft support portion, which is the support point P3 on the top plate 21 (chair portion 10) side of the second link shaft 23b of the X-axis-shaped link member 23, is set. It is slightly higher than the support point P1 of the rotating wheel 23d on the top plate 21 (chair portion 10) side of the first link shaft 23a with respect to the thickness (height) direction of the top plate 21.

That is, if the support point P3 of the second link shaft 23b is set to a position slightly higher than the support point P1 of the first link shaft 23a with respect to the thickness (height) direction of the top plate 21, as shown in FIG. In the state where the seat chair portion 10 is most lowered (height H), even if the support point P1 is actually lower than the support point P2, the front side in the seating direction is higher than the rear side and the seat chair portion 10 is in a state of being slightly tilted backward (angle Q °). As a result, the buttocks are less likely to slide forward from the seat surface 12 when seated, and the seat can be seated in a more stable state.

In the state shown in FIGS. 12 and 13, the height of the support point P2 of the first link shaft 23a is set higher than that of the support point P4 of the second link 23b with respect to the thickness (height) direction of the bottom plate 22. It can be achieved even if it is lowered. Therefore, by adopting either one structure or using both structures together, when the seat chair portion 10 is lowered, the seat surface 12 can be tilted backward by a predetermined angle Q °. Even if the seat chair portion 10 is tilted backward when descending in this way, it shifts to a horizontal state by rising, and eventually becomes a forward tilting state at the maximum climb, but the seat is seated at the maximum climb. It is also possible to bring the chair portion 10 into the horizontal state at the time of maximum elevation by appropriately adjusting the lengths of the link shafts 23a and 23b without causing the chair portion 10 to be tilted forward.

Further, in order to bring the seat surface 12 (chair portion 10) to the backward tilted state when the seat chair portion 10 is lowered to the maximum position in this way, in addition to the above structure, FIGS. 14 and 15 show. It can also be achieved by the structure shown. That is, if the diameter d1 of the rotating wheel 23d of the first link shaft 23a is made larger than the diameter d2 of the rotating wheel 23 as shown in FIGS. 5 and 6, as shown in FIGS. 14 and 15, the rotating wheel is formed. The position supported by the rail 21a of the seat chair portion 10 by 23d is raised by that amount. As a result, even if the support point P1 is lower than the support point P2, the front side of the seat chair portion 10 in the seating direction is tilted (backward tilted) so as to be higher than the rear side thereof, so that the buttocks are seated when seated. It is less likely to slide forward from 12, and you can sit in a more stable state.

100 ... Elevating seat chair 10 ... Seat chair part 20 ... Elevating part 21 ... Top plate 22 ... Bottom plate 23 ... X-axis link member 23a ... First link shaft 23b ... Second link shaft 23c, 23d ... Rotating wheel 24 ... Ball screw mechanism 25 ... Motor 30 ... Rotating table P1, P2, P3, P4 ... Support point P5 ... Crossing axis

Claims (3)

A seat chair portion and an elevating portion for raising and lowering the seat chair portion are provided.
The elevating part
When located below the seat chair portion, the bottom plate, at least a pair of X-axis link members that support and connect the seat chair portion and the bottom plate up and down, and the X-axis link member are raised and lowered via a ball screw mechanism. Equipped with a moving motor
Each of the X-axis link members includes a first link shaft extending from the front side of the seat chair portion in the seating direction to the rear side of the bottom plate, and the front side of the bottom plate from the rear side of the seat chair portion in the seating direction. In addition to having a second link shaft extending to, one or both of the first link shaft and the second link shaft is shorter on the front side of the seat chair portion in the seating direction than on the rear side of the crossing shaft. The elevating seat chair is characterized in that the support point on the bottom plate side of the first link shaft is lower than the support point on the bottom plate side of the second link shaft. In the elevating chair according to claim 1,
One end of the first link shaft is pivotally supported on the rear side of the bottom plate in the seating direction, the other end supports the seat chair portion via a rotating wheel, and the diameter of the rotating wheel is the seat. An elevating seat chair characterized in that the front side of the seat portion in the seating direction is higher than the rear side when the chair portion is lowered. In the elevating chair according to claim 1 or 2.
An elevating chair characterized by having a rotary table under the bottom plate.

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