JP2011167342A - Chair with tilting seat surface and tilting unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chair with a tilting seat surface and a tilting unit for moderate training of muscular strength of the legs corresponding to walking while doing office work in a sitting state. <P>SOLUTION: The chair with the tilting seat surface includes a leg part, a seat for a user to sit and the tilting unit. The tilting unit is removably arranged between the seat and the leg part for periodically inclining the seat. The seat is inclined so as to be lowered from a base position toward one edge in a first direction which is vertical to a perpendicular direction, at the same time the seat is inclined so as to be lowered toward a first edge in a second direction which is vertical to the perpendicular direction and orthogonal to the first direction. Thereafter the seat is moved back to the base position. The seat is inclined again so as to be lowered toward the one edge in the first direction and at the same time it is inclined so as to be lowered toward a second edge in the second direction which faces the first edge in the second direction. Thereafter the seat is moved back to the base position. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a seat surface tilting chair and a tilting unit that periodically tilts a seating portion on which a user is seated.

Conventionally, various seat surface tilting chairs having a mechanism for periodically tilting a seat portion on which a user sits have been proposed.
For example, in a seat surface tilting chair described in Patent Document 1 below, a tilting unit is detachably provided between a seat and a leg on which a user is seated. Further, the tilting unit is configured such that the rear end edge portion of the seat portion is pivotally supported by a support shaft, and the front end edge portion of the seat portion is moved up and down at regular intervals by a lifting arm that moves up and down by driving of the motor M. The inclination angle is changed.

JP 2003-38283 A

With the seat surface tilting chair having the configuration described in Patent Document 1 described above, it is possible to reduce fatigue of the user's buttocks and thighs caused by sitting for a long time.
However, in offices that handle office work, there are many tasks in a sitting state, and users tend to be short of exercise. In addition, moderate walking is recommended to prevent the lack of exercise and lower limb muscle strength, but if you are doing office work for a long time, it is possible to secure time to perform moderate walking There is a problem that it is difficult.

  Therefore, the present invention has been made to solve the above-described problems, and can perform appropriate training of lower limb muscle strength according to walking while performing office work in a sitting state. An object is to provide a surface tilting chair and a tilting unit.

  In order to achieve the object, a seat surface tilting chair according to claim 1 is provided between a leg portion, a seat portion on which a user is seated, and the seat portion and the leg portion. A first edge in a second direction that is tilted so as to be lowered toward one edge in the first direction perpendicular to the vertical direction and is perpendicular to the vertical direction and orthogonal to the first direction. After tilting to the lower side, return to the basic position and tilt again to the one end edge side in the first direction, and at the same time with respect to the first edge side in the second direction. And a tilting unit that is tilted so as to be lowered toward the second end edge in the second direction opposite to each other and then periodically tilted so as to return to the basic position again. A first rotary shaft disposed on one axis and rotatably supported; and the first rotary shaft An attached first worm wheel; a second rotating shaft disposed on the axis of the second direction and rotatably supported; a second worm wheel attached to the second rotating shaft; A worm shaft that is coaxially provided with a first worm that meshes with one worm wheel and a second worm that meshes with the second worm wheel, and is rotatably supported by the shaft, and a drive motor that rotationally drives the worm shaft The tilting unit lowers the seat portion from the basic position to the one end edge side in the first direction via the second worm and the second worm wheel by the rotational drive of the worm shaft. And at the same time, the seat is moved from the basic position via the first worm and the first worm wheel to the first end edge in the second direction or in the second direction. And wherein the tilting so down to 2 edge side.

  The seat surface tilting chair according to claim 2 is the seating surface tilting chair according to claim 1, wherein the leg portion includes a leg column member erected in a vertical direction, and the tilting unit includes the tilting unit, A fixed frame member fixed to the leg support member; the drive motor has a motor shaft connected to the worm shaft via a shaft coupling; and the second rotating shaft is connected to the leg support member with respect to the leg support member. It is arrange | positioned rather than the worm shaft in the one edge part side of the said 1st direction of the said seat part, It is characterized by the above-mentioned.

  The seat surface tilting chair according to claim 3 is the seat surface tilting chair according to claim 2, wherein the tilting unit is swingable about a rotation axis in the first direction with respect to the fixed frame member. An attached swing frame member, and an edge portion disposed on the upper side of the swing frame member so that the seat portion is attached to the upper side and opposite to one end edge portion in the first direction of the seat portion And a seat mounting member that is swingably mounted about the rotation axis in the second direction with respect to the swing frame member, and one end side of each end of the second rotation shaft. It is eccentrically attached to the axis and is rotatably mounted, and the other end is rotatable to the free end side edge portion in the first direction opposite to the swinging end portion of the seat mounting member. A pair of upper and lower link parts attached to And an oscillating link member having one end side eccentrically attached to the outer end portion of the first rotating shaft and eccentrically attached to the axis of the first rotating shaft, and the other end side rotatably attached to the fixed frame member; The drive motor is attached to the bottom surface of the swing frame member.

  Furthermore, the seat surface tilting chair according to claim 4 is the seat surface tilting chair according to any one of claims 1 to 3, wherein a reduction ratio by the first worm and the first worm wheel is the second speed ratio. The reduction ratio of the worm and the second worm wheel is ½.

  The tilting unit according to claim 5 is a tilting unit provided between a leg portion of the chair and a seating portion on which the user is seated, and is disposed on an axis in a first direction perpendicular to the vertical direction. A first rotating shaft rotatably supported by the shaft, a first worm wheel attached to the first rotating shaft, and a second direction axis perpendicular to the vertical direction and perpendicular to the first direction. A second rotating shaft arranged on a line and rotatably supported; a second worm wheel attached to the second rotating shaft; a first worm meshing with the first worm wheel; and the second worm wheel. A worm shaft provided on a coaxial line and rotatably supported by a worm shaft; and a drive motor for rotationally driving the worm shaft, wherein the second worm is driven by rotation of the worm shaft. And The seat is inclined via the second worm wheel so as to be lowered from the basic position toward one end edge in the first direction, and at the same time, the seat is interposed via the first worm and the first worm wheel. The portion is inclined so as to be lowered from the basic position to the first end edge side in the second direction or the second end edge side in the second direction opposite to the first end edge side in the second direction. And tilting the seat portion so as to be lowered from the basic position toward one end edge in the first direction, and simultaneously tilting the base portion toward the first end edge in the second direction. , And again tilted so as to descend toward one end edge in the first direction, and simultaneously tilted so as to descend toward the second end edge in the second direction, and then return to the basic position again. It is characterized by tilting periodically.

  A tilting unit according to a sixth aspect is the tilting unit according to the fifth aspect, further comprising a fixed frame member fixed to a leg strut member erected in a vertical direction of the leg portion, wherein the drive motor is The motor shaft is coupled to the worm shaft via a shaft coupling, and the second rotating shaft is on one edge side of the seat portion in the first direction with respect to the leg support member relative to the worm shaft. It is characterized by being arranged in.

  A tilting unit according to a seventh aspect is the tilting unit according to the sixth aspect, wherein the swinging frame member is swingably attached to the fixed frame member about the rotation axis in the first direction; The seat is disposed on the upper side of the swinging frame member and the seat is attached to the upper side, and an edge portion of the seat facing the one end edge in the first direction is opposed to the swinging frame member. A seat mounting member that is swingably mounted about the rotation axis in the second direction, and one end of each of the both ends of the second rotation shaft are mounted eccentrically with respect to the axis of the second rotation shaft. In addition, a pair of upper and lower link members rotatably attached to the free end side edge portion in the first direction opposite to the edge portion of the seat portion attachment member that is swingably attached to the other end side. And the first rotating shaft A swing link member, one end side of which is eccentrically attached to the outer end portion from the axis of the first rotation shaft, and the other end side of which is rotatably attached to the fixed frame member. The swing frame member is attached to the bottom surface of the swing frame member.

  Further, the tilting unit according to claim 8 is the tilting unit according to any one of claims 5 to 7, wherein a reduction ratio by the first worm and the first worm wheel is set so that the second worm and the second worm wheel have a reduction ratio. It is characterized in that it is ½ of the reduction ratio by 2 worm wheels.

  In the seat tilting chair according to claim 1, by tilting the tilting unit, the seat is periodically tilted from the basic position to one end edge in the first direction perpendicular to the vertical direction. At the same time, after inclining so as to descend to the first end edge side in the second direction perpendicular to the vertical direction and perpendicular to the first direction, it returns to the basic position and again is one end in the first direction. Inclined to fall to the edge side, and at the same time inclined to fall to the second end edge side in the second direction opposite to the first end edge side in the second direction, and then returned to the basic position again .

  For this reason, a user who is seated toward one edge in the first direction of the seat portion operates the tilting unit to periodically apply a predetermined load to the left foot and the right foot. It becomes possible to perform moderate training of lower limb muscle strength according to walking. Further, by attaching a tilting unit between the leg portion and the seat portion, the seat surface tilting chair can be produced and can be easily manufactured, and the production cost can be reduced.

  Further, by rotating the drive motor, the first rotating shaft and the second rotating shaft arranged so as to be orthogonal to each other are rotated through two worms arranged on one worm shaft, and the seat portion The periodic tilting operation can be realized. As a result, the rotational movement of the tilting unit about two orthogonal axial directions can be realized with a simple configuration, the number of parts can be reduced and the size can be reduced, and the tilting unit can be placed between the seat and the leg. It can be easily arranged. In addition, since the rotational driving force of the drive motor is transmitted from the worm shaft to the first rotating shaft and the second rotating shaft via each worm gear, the reduction ratio is easily increased, and the inclination period of the seat portion is set to an appropriate walking speed. Can be set to be

  In the seat surface tilting chair according to claim 2, the drive motor for rotationally driving the worm shaft can be disposed closer to the leg column member side than the second rotation shaft, and the position of the center of gravity of the tilt unit is further increased. The position of the center of gravity of the seat tilting chair can be easily arranged near the center axis of the leg portion close to the member. In addition, since the rotational drive force is transmitted from the worm shaft connected to the motor shaft of the drive motor to the first rotary shaft and the second rotary shaft via the worm gears via the shaft joint, the reduction ratio can be easily increased, and the seat The inclination cycle of the part can be easily set so as to have an appropriate walking speed.

  In the seat surface tilting chair according to claim 3, the second rotating shaft is rotationally driven via the second worm and the second worm wheel by rotating the drive motor, and the pair of upper and lower link members are interposed. The seat mounting member can be tilted by moving up and down around an end edge facing the one end edge in the first direction of the seat. At the same time, the first rotating shaft is rotationally driven through the first worm and the first worm wheel, and the swing frame member is rotated about the rotation axis in the first direction with respect to the fixed frame member through the swing link member. Is swung.

  As a result, by rotating the drive motor, the seat attached to the seat attaching member is periodically lowered from the basic position to one edge in the first direction perpendicular to the vertical direction. At the same time as it is tilted so as to be lowered toward the first edge in the second direction perpendicular to the vertical direction and perpendicular to the first direction, and then returned to the basic position and again in one direction of the first direction. And the basic position again after inclining to descend toward the second end edge in the second direction opposite to the first end edge in the second direction. Can be returned to. Further, since the drive motor is attached to the bottom surface portion of the swing frame member, the drive motor can be easily disposed between the swing frame member and the leg portion, so that the swing frame member can be thinned. This tilting unit can be easily arranged between the seat and the leg.

  Furthermore, in the seat surface tilting chair according to claim 4, the first rotating shaft includes the first worm and the first worm wheel whose reduction ratio is set to ½ of the reduction ratio of the second worm and the second worm wheel. The rotational driving force of the drive motor is transmitted through the via. Thus, the vertical movement from the basic position in the second direction to the vertical movement inclined from one basic position of the seat attached to the seat mounting member to one end edge side in the first direction. Accurately return to the basic position again after inclining to the second end edge side in the second direction opposite to the first end edge side or the first end edge side in the second direction. The seat portion can be periodically and accurately inclined alternately from the basic position toward the first end edge portion in the second direction or the second end edge portion in the second direction.

  Further, in the tilting unit according to claim 5, the seat is periodically perpendicular to the vertical direction from the basic position by being attached and operated between the leg of the chair and the seat where the user is seated. After inclining to descend toward one edge in the first direction and simultaneously inclining to descend toward the first edge in the second direction perpendicular to the vertical direction and perpendicular to the first direction The second edge in the second direction is inclined so as to return to the basic position and to be lowered again toward the one edge part in the first direction, and at the same time is opposed to the first edge part in the second direction. After tilting down to the part side, it returns to the basic position again.

  For this reason, a user who is seated toward one edge in the first direction of the seat portion operates the tilting unit to periodically apply a predetermined load to the left foot and the right foot. It becomes possible to perform moderate training of lower limb muscle strength according to walking. Further, by attaching a tilting unit between the leg portion and the seat portion, the seat surface tilting chair can be produced and can be easily manufactured, and the production cost can be reduced.

  Further, by rotating the drive motor, the first rotating shaft and the second rotating shaft arranged so as to be orthogonal to each other are rotated through two worms arranged on one worm shaft, and the seat portion The periodic tilting operation can be realized. As a result, the rotational movement of the tilting unit about two orthogonal axial directions can be realized with a simple configuration, the number of parts can be reduced and the size can be reduced, and the tilting unit can be placed between the seat and the leg. It can be easily arranged. In addition, since the rotational driving force of the drive motor is transmitted from the worm shaft to the first rotating shaft and the second rotating shaft via each worm gear, the reduction ratio is easily increased, and the inclination period of the seat portion is set to an appropriate walking speed. Can be set to be

  In the tilting unit according to the sixth aspect, the drive motor for rotationally driving the worm shaft can be arranged closer to the leg column member side than the second rotation shaft, and the position of the center of gravity of the tilt unit is further set to the leg column member. The position of the center of gravity of the seat tilting chair can be easily arranged near the center axis of the leg portion. In addition, since the rotational drive force is transmitted from the worm shaft connected to the motor shaft of the drive motor to the first rotary shaft and the second rotary shaft via the worm gears via the shaft joint, the reduction ratio can be easily increased, and the seat The inclination cycle of the part can be easily set so as to have an appropriate walking speed.

  In the tilting unit according to the seventh aspect, the second rotating shaft is rotationally driven via the second worm and the second worm wheel by rotationally driving the drive motor, and the seat portion is interposed via the pair of upper and lower link members. The mounting member can be tilted by moving up and down about an edge portion facing one edge portion in the first direction of the seat portion. At the same time, the first rotating shaft is rotationally driven through the first worm and the first worm wheel, and the swing frame member is rotated about the rotation axis in the first direction with respect to the fixed frame member through the swing link member. Is swung.

  As a result, by rotating the drive motor, the seat attached to the seat attaching member is periodically lowered from the basic position to one edge in the first direction perpendicular to the vertical direction. At the same time as it is tilted so as to be lowered toward the first edge in the second direction perpendicular to the vertical direction and perpendicular to the first direction, and then returned to the basic position and again in one direction of the first direction. And the basic position again after inclining to descend toward the second end edge in the second direction opposite to the first end edge in the second direction. Can be returned to. Further, since the drive motor is attached to the bottom surface portion of the swing frame member, the drive motor can be easily disposed between the swing frame member and the leg portion, so that the swing frame member can be thinned. This tilting unit can be easily arranged between the seat and the leg.

  Further, in the tilting unit according to the eighth aspect, the first rotating shaft passes through the first worm and the first worm wheel whose reduction ratio is set to ½ of the reduction ratio of the second worm and the second worm wheel. The rotational driving force of the drive motor is transmitted. Thus, the vertical movement from the basic position in the second direction to the vertical movement inclined from one basic position of the seat attached to the seat mounting member to one end edge side in the first direction. Accurately return to the basic position again after inclining to the second end edge side in the second direction opposite to the first end edge side or the first end edge side in the second direction. The seat portion can be periodically and accurately inclined alternately from the basic position toward the first end edge portion in the second direction or the second end edge portion in the second direction.

It is a figure which shows the use condition of the seat surface tilting chair which concerns on this embodiment. It is a perspective view of a seat surface tilting chair. It is a disassembled perspective view of a seat surface tilting chair. It is a top view except only the seat part attachment member of the tilting unit. It is X1-X1 arrow sectional drawing of FIG. It is X2-X2 arrow sectional drawing of FIG. It is X3-X3 arrow sectional drawing of FIG. It is a front view of a tilting unit. It is a rear view of a tilting unit. FIG. 10 is a cross-sectional view taken along arrows X4-X4 in FIGS. 8 and 9. It is a left view of a tilting unit. It is a right view of a tilting unit. It is a front view which shows the tilting unit with a seat part in a horizontal state. It is a front view which shows the tilting unit in the state in which the seat part inclined in the diagonally forward right direction. It is a front view which shows the tilting unit in the state in which the seat part inclined in the diagonally forward left direction. It is a figure which shows typically a motion of a seat surface tilting chair.

DETAILED DESCRIPTION Hereinafter, a seat surface tilting chair and a tilting unit according to the present invention will be described in detail with reference to the drawings based on an embodiment that is embodied.
First, a schematic configuration of the seat surface tilting chair 1 according to the present embodiment will be described based on FIGS. 1 to 3.

[Schematic configuration of the seat tilting chair]
As shown in FIG. 1, the seat surface tilting chair 1 is to be seated when an operator 3 performs office work in an office or the like. Then, when the operator 3 is seated, the power switch 7 of the control box 6 attached to the rear side of the backrest 5 is turned on, so that the seat 8 is left from the horizontal state at a constant cycle as will be described later. It inclines by a predetermined inclination angle alternately diagonally forward and diagonally forward right (see FIG. 16). The control box 6 houses a control circuit board and the like for driving and controlling the drive motor 46 (see FIG. 2) and the like.

  As shown in FIGS. 2 and 3, the seat surface tilting chair 1 has a tilting unit 11 attached to a leg portion 9 and a seating portion 8 attached to the tilting unit 11. The leg portion 9 is provided with a leg blade 12 with a caster at the lower end. Further, a leg support member 13 is erected in the vertical direction from the leg blades 12, and the tilting unit 11 is attached to the leg support member 13 by screws or the like. Further, the lower end portion of the backrest portion 5 is attached to the upper end portion of the leg support member 13.

  This leg strut member 13 has an elevating mechanism, and the operator 3 can expand and contract in the height direction by operating an operation lever (not shown) so that the height of the seat portion 8 can be changed to an appropriate position. It is configured. Further, a substantially elongated plate-like attachment member 14 that is long in the front-rear direction with respect to the backrest portion 5 is fixed to the upper end portion of the leg support member 13 by spot welding or screwing.

  The tilting unit 11 is mounted on the upper end surface of the mounting member 14 with a mounting portion 15C (see FIG. 5) extending from the upper side of the crank-shaped fixed frame member 15 in a side view from above. It attaches so that attachment or detachment is possible (refer FIG. 5). The seat 8 is detachably attached to a substantially flat seat attaching member 17 constituting the upper end of the tilting unit 11 by screwing or the like.

[Schematic configuration of tilting unit]
Next, a schematic configuration of the tilting unit 11 will be described with reference to FIGS.
As shown in FIGS. 3 to 5 and FIGS. 8 to 10, the crank-shaped fixed frame member 15 in a side view has a bottom surface portion 15 </ b> A having a substantially rectangular shape in a plan view and a back and forth portion 5 of the bottom surface portion 15 </ b> A. A predetermined height (for example, a height slightly below the upper end of the swinging frame member 21) from the rear edge of the direction (first direction) to the upper right angle over the entire width in the left-right direction (second direction). The rear side wall portion 15B extending in a front view trapezoidal shape extended from the upper end edge of the rear side wall portion 15B to the rear side over the entire width and extending substantially perpendicularly to the rear side in the front-rear direction is substantially rectangular. It is comprised from the 15-shaped attachment part. A plurality of screw holes (not shown) are formed in the attachment portion 15C, and are placed on the upper surface portion of the attachment member 14 and screwed.

  The fixed frame member 15 includes a front support wall portion 15D that extends upward from the front edge of the bottom surface portion 15A over the entire width in the left-right direction by a predetermined height, and a slightly front side from the rear side wall portion 15C of the bottom surface portion 15A. And a rear support wall portion 15 </ b> E that is erected above a predetermined height over the entire width in the left-right direction. In addition, a recess having a circular cross section that is recessed inward is formed at the center in the left-right direction of each support wall 15D, 15E, and a pair of bearings 19 are mounted so as to be positioned on the coaxial line.

  The substantially box-shaped swinging frame member 21 opened in the up-down direction is screwed with bolts 22 fitted in the bearings 19 of the fixed frame member 15 at the center in the left-right direction of the front and rear side walls. Has been. The swing frame member 21 is attached so that the bottom surface forms a predetermined gap with the bottom surface portion 15A of the fixed frame member 15. Accordingly, the swing frame member 21 is attached to the fixed frame member 15 so as to be swingable around the rotation axis 23 in the front-rear direction via the bearings 19.

  Further, as shown in FIGS. 3 to 12, a seat mounting member 17 is disposed on the upper side of the swinging frame member 21, and the front end edge portions (the second portion of the seat 8) of the both sides of the seat mounting member 17 are arranged. A pair of brackets 25 extending in a downward direction with a predetermined width are formed on one end edge portion in one direction. In a substantially central portion of the pair of brackets 25, a hollow portion 25A having a circular section that is recessed inwardly is formed, and the outer ring of each bearing 26 is press-fitted so that the pair of bearings 26 are positioned on the coaxial line. .

  Then, the bolts 27 fitted from the outside into the inner rings of the bearings 26 are fitted into the through holes formed in the front upper end portions of the both side surface portions of the swing frame member 21 with the spacers interposed therebetween, and are fastened by the nuts 28. Has been. As a result, the seat mounting member 17 is swingably attached to the swing frame member 21 via the bearings 26 around the rotation axis 29 in the left-right direction. The outer diameter of each spacer is formed to be approximately equal to the outer diameter of the inner ring of each bearing 26.

  As shown in FIGS. 4 to 8, the second rotating shaft is positioned below the central portion in the vertical direction at a substantially central portion between the front-rear direction central portion and the front side wall portion in the swing frame member 21. 31 is rotatably supported by bearings 32 provided on the left and right side wall portions of the swing frame member 21. Each bearing 32 is fitted in and attached to a recess having a circular cross section that is recessed inwardly and formed on both left and right side walls of the swing frame member 21. Further, both end portions of the second rotating shaft 31 are formed so as to protrude by a predetermined length in the outward direction from the respective bearings 32.

  Then, substantially cylindrical swing bar fixing members 33 each having a through hole into which the both end portions are respectively inserted are fixed to both end portions of the second rotating shaft 31 with hexagon socket set screws or the like. Has been. Further, a flange portion 33A having a predetermined outer diameter extending outward in the radial direction is formed on the outer end edge portion of each swing bar fixing member 33, and each vertical link bar (upper and lower link member) is formed as described later. One end side of 35 is rotatably attached (see FIGS. 11 and 12).

  Further, a second worm wheel 37 constituting the second worm gear 36 is fixed to one end edge portion (the right end edge portion in FIG. 6) in the swing frame member 21 of the second rotating shaft 31. Has been. A second worm 38 constituting the second worm gear 36 is formed on the outer peripheral surface below the central portion in the vertical direction on the rear side of the second worm wheel 37 and the first worm gear 39 is constituted. A worm shaft 41 in which one worm 40 is formed on the outer peripheral surface above the central portion in the vertical direction is arranged in the vertical direction.

  Both end portions of the worm shaft 41 in the axial direction are rotatably supported by the bearings 42. Each bearing 42 has an outer ring press-fitted into a recess having a circular cross section that is recessed inwardly and formed in each support frame 43 spanned in the front-rear direction of the upper and lower ends of the swing frame member 21. It is attached. Further, the upper end edge of the worm shaft 41 protrudes a predetermined length in the upper direction from the bearing 42, a screw is formed on the outer peripheral surface, and is fastened by a nut 44.

  Further, the lower end edge portion of the worm shaft 41 protrudes a predetermined length downward from the bearing 42 and is connected to the motor shaft 47 of the drive motor 46 by a shaft coupling 45. The drive motor 46 is attached to the bottom surface of the lower support frame 43 via a pair of U-shaped motor mounting brackets 48 whose upper edge is fixed to the bottom surface of the lower support frame 43. It has been.

  The width in the left-right direction of each motor mounting bracket 48 is formed to be substantially the same as the width in the left-right direction of the drive motor 46. The drive motor 46 is driven by a household power source by turning on the power switch 7 and rotationally drives the worm shaft 41 at a predetermined rotational speed via the shaft coupling 45.

  Further, on the opposite side of the oscillating frame member 21 with respect to the worm shaft 41 in the left-right direction, a first rotating shaft 51 is provided on both side walls on the front and rear sides of the oscillating frame member 21 above the central portion in the vertical direction. The bearings 52 are rotatably supported so as to be orthogonal to the second rotation shaft 31. Each bearing 52 is fitted into and attached to a recess having a circular cross section that is recessed inwardly and formed on both side wall portions on the front and rear sides of the swing frame member 21. Further, both end portions of the first rotating shaft 51 are formed so as to protrude by a predetermined length outward from the respective bearings 52.

  Further, the rear end edge portion of the first rotating shaft 51 protrudes a predetermined length in the rear direction from the bearing 52, a screw is formed on the outer peripheral surface, and is fastened by a nut 53. Further, the front end edge portion protruding a predetermined length from the bearing 52 of the first rotating shaft 51 has a substantially cylindrical shape in which a through hole into which the front end edge portion is inserted is formed on the axis. The moving bar fixing member 55 is fixed by a hexagon socket set screw or the like. A first worm wheel 56 that meshes with the first worm 40 is fixed at a position facing the first worm 40 that constitutes the first worm gear 39 of the first rotating shaft 51.

  The reduction ratio of the first worm gear 39 is set to ½ of the reduction ratio of the second worm gear 36. That is, the first worm wheel 56 is set to rotate once for every two rotations of the second worm wheel 37. Accordingly, when the worm shaft 41 is rotationally driven by the drive motor 46, the second rotational shaft 31 is rotated twice by the second worm gear 36, whereas the first rotational shaft 51 is 1 by the first worm gear 39. It is rotated.

  Also, as shown in FIGS. 4, 6, and 8 to 12, the left and right side surfaces of the tilting unit 11 are provided on the axially outer side surfaces of the flange portions 33 </ b> A of the swing bar fixing members 33 and the seat mounting members. A pair of substantially elongated plate-like upper and lower link bars 35 that connect the rear end edges of the both side surfaces of 17 are provided. Each through hole 35A is formed at both ends of each upper and lower link bar 35, and the outer ring of each bearing 58 having the same thickness as the plate thickness is press-fitted.

  The end of each upper and lower link bar 35 on the flange 33A side is decentered from the center position to the radially outer side by the bolt 59 inserted through each bearing 58 on the axially outer surface of each flange 33A. As shown, it is screwed with a spacer in between, and is rotatably supported. Also, a pair of brackets 61 extending in a predetermined width in the lower direction are formed on the rear end edges (the free end side end edges in the first direction) of the left and right side surfaces of the seat mounting member 17. Yes.

  The end portions of the upper and lower link bars 35 on the bracket 61 side are inserted into the through holes formed in the brackets 61 with the spacers interposed between the bolts 62 inserted into the bearings 58, and the nuts 63. Fastened and rotatably supported. The outer diameter of each spacer is formed to be approximately equal to the outer diameter of the inner ring of each bearing 58.

  Accordingly, when the second rotating shaft 31 makes one rotation through the second worm gear 36 by the rotational drive of the drive motor 46, the seat mounting member 17 is connected to each of the flanges 33A and the upper and lower link bars 35. The trailing edge of the bearing 26 rises once around the rotation axis 29 of the bearing 26 from the horizontal state and then returns to the horizontal state again.

  Also, as shown in FIGS. 4, 5, 7, 8, 11, and 12, the front end surface of the swing bar fixing member 55 fixed to the front end edge of the first rotating shaft 51 is fixed. An end edge (left end edge in FIG. 8) on the outer side in the left-right direction of the front support wall 15D of the frame member 15 is connected by a substantially elongated plate-like swing link bar (swing link member) 65. Yes. At both ends of the swing link bar 65, through holes 65A are formed, and the outer rings of the bearings 66 having the same thickness as the plate thickness are press-fitted.

  The end of the swing link bar 65 on the swing bar fixing member 55 side is decentered radially outward from the center position on the front end surface of the swing bar fixing member 55 by a bolt 67 inserted through the bearing 66. As shown, it is screwed with a spacer in between, and is rotatably supported. Further, the end portion of the swing link bar 65 on the front support wall portion 15D side is screwed by a bolt 68 inserted into the bearing 66 with a spacer on the front side surface of the front support wall portion 15D so as to be rotatable. It is pivotally supported. The outer diameter of each spacer is formed to be approximately equal to the outer diameter of the inner ring of each bearing 66.

  Therefore, when the first rotating shaft 51 is rotated once through the first worm gear 39 by the rotational drive of the drive motor 46, the swing bar fixing member 55 fixed to the front end edge of the first rotating shaft 51. Also makes one revolution. The fixed frame member 15 is fixed to an attachment member 14 fixed to the leg support member 13.

  For this reason, when the swinging bar fixing member 55 makes one rotation, the swinging frame member 21 is connected to the front support wall portion 15D and the rear support wall portion 15E of the fixed frame member 15 via the swing link bar 65. After tilting a predetermined angle from the horizontal state (basic position) to one of the up and down directions around the rotation axis 23 of each bearing 19 provided in the (inclination so as to descend toward the first edge in the second direction) After that, after returning to the horizontal state and inclining a predetermined angle to the other of the up and down directions (after inclining so as to descend toward the second end edge in the second direction), it returns to the horizontal state again.

[An example of rocking drive of a seat tilting chair]
Next, an example when the drive motor 46 of the seat tilting chair 1 configured as described above is operated will be described with reference to FIGS. 13 to 16.
As shown in FIG. 13, first, in a normal state where the drive motor 46 is not operated, that is, when the operation of the drive motor 46 is started by turning on the power switch 7, the seat mounting member of the tilting unit 11 is started. Reference numeral 17 denotes a horizontal state, that is, a basic position (see FIG. 10, FIG. 11, etc.). Therefore, as shown to A of FIG. 16, the seat part 8 attached to the seat part attachment member 17 of the tilting unit 11 is a horizontal state of a basic position.

  For example, a mechanical switch (not shown), a grooved photomicrosensor, or the like is attached to the upper end portion of the swing frame member 21. When the power switch 7 of the control box 6 is turned from ON to OFF, the lower surface of the seat mounting member 17 pushes down the mechanical switch, or the rib protruding from the lower surface of the seat mounting member 17 has a groove shape. The drive motor 46 is configured to stop when it enters the groove of the photomicrosensor. That is, the drive motor 46 is configured to stop when the seat mounting member 17 is in the horizontal state at the basic position.

  Then, as shown in FIG. 14, when the power switch 7 is turned on to start the rotational drive of the drive motor 46, the second rotary shaft 31 rotates 180 degrees from the front to the back side via the second worm gear 36. The rear end edge of the seat mounting member 17 is rotated from the horizontal state to the uppermost side around the rotation axis 29 of each bearing 26 via each flange 33A and each upper and lower link bar 35. For example, the seat mounting member 17 is rotated about 20 degrees upward from the horizontal state and is inclined in the front direction.

  At the same time, since the first rotating shaft 51 rotates 90 degrees counterclockwise when viewed from the front via the first worm gear 39, the swing link bar 65 is rotated upward, and the swing frame member 21 is fixed to the fixed frame. Around the rotation axis 23 of each bearing 19 provided on each support wall 15D, 15E of the member 15, it is rotated from the horizontal state by a predetermined angle (for example, about 7 degrees) in the counterclockwise direction when viewed from the front. The Therefore, as shown in B of FIG. 16, the seat portion 8 attached to the seat portion attaching member 17 of the tilting unit 11 is most inclined in the diagonally forward right direction.

  Subsequently, when the rotation of the drive motor 46 is continued and the second rotary shaft 31 is further rotated 180 degrees from the near side to the back side via the second worm gear 36, that is, when the rotation is performed once, Via the flange portion 33A and the upper and lower link bars 35, the seat mounting member 17 rotates downward around the rotation axis 29 of each bearing 26 and returns to the horizontal state (see FIG. 13).

  At the same time, since the first rotating shaft 51 rotates 180 degrees counterclockwise when viewed from the front via the first worm gear 39, the swing link bar 65 is rotated leftwardly when viewed from the front. For this reason, the swing frame member 21 is rotated about the rotation axis 23 of each bearing 19 provided on each support wall portion 15D, 15E of the fixed frame member 15 via the swing link bar 65 to be horizontal. Return to state. Accordingly, as shown in FIG. 16C, the seat portion 8 attached to the seat portion attaching member 17 of the tilting unit 11 returns to the horizontal state.

  Then, as shown in FIG. 15, when the rotation of the drive motor 46 is continued and the second rotating shaft 31 is further rotated 180 degrees from the near side to the back side via the second worm gear 36, that is, one rotation. In the case of half, the seat mounting member 17 is rotated around the rotation axis 29 of each bearing 26 via the flanges 33A and the upper and lower link bars 35, and the rear edge is again the uppermost side from the horizontal state. Is rotated.

  At the same time, since the first rotating shaft 51 rotates 270 degrees counterclockwise when viewed from the front via the first worm gear 39, the swing link bar 65 is rotated downwardly when viewed from the front, and the swing frame member 21 is rotated. Is a predetermined angle (for example, about 7 degrees) from the horizontal state to the most clockwise direction around the rotation axis 23 of each bearing 19 provided on each support wall portion 15D, 15E of the fixed frame member 15. It is rotated. Therefore, as shown in D of FIG. 16, the seat portion 8 attached to the seat portion attaching member 17 of the tilting unit 11 is most inclined in the diagonally forward left direction.

  Thereafter, when the rotation of the drive motor 46 is continued and the second rotating shaft 31 is further rotated 180 degrees from the near side to the back side via the second worm gear 36, that is, when the rotation is performed twice, The seat mounting member 17 is rotated downward around the rotation axis 29 of each bearing 26 via the portion 33A and the upper and lower link bars 35 to return to the horizontal state (see FIG. 13).

  At the same time, the first rotary shaft 51 rotates 360 degrees counterclockwise when viewed from the front via the first worm gear 39, so that the swing link bar 65 is rotated to the initial position. For this reason, the swing frame member 21 is rotated about the rotation axis 23 of each bearing 19 provided on each support wall portion 15D, 15E of the fixed frame member 15 via the swing link bar 65 to be horizontal. Return to the state (see FIG. 13). Therefore, returning to the state shown in FIG. 16A, the seat 8 attached to the seat mounting member 17 of the tilting unit 11 returns to the horizontal state again.

  That is, since the rotational drive of the drive motor 46 is continued until the power switch 7 is turned OFF, the seat portion 8 of the seat surface tilting chair 1 repeats the tilting operation from A in FIG. 16 to D in FIG. When the power switch 7 is turned off, the drive motor 46 is stopped when the seat mounting member 17 is in a horizontal state. That is, as shown in FIG. 16A, when the power switch 7 is turned off, the drive motor 46 is stopped when the seat portion 8 is in the horizontal state of the basic position.

  Here, the rotation speed of the drive motor 46 is such that the seat portion 8 is walked by the worker 3 in a fixed cycle in which the seat portion 8 is alternately inclined from the horizontal state to the left oblique front direction and the right oblique front direction by a predetermined inclination angle and returned to the horizontal state. For example, it is set to be a cycle of two steps. That is, the tilting motion of the seat portion 8 from A in FIG. 16 to D in FIG. 16 is set to match the walking motion of the worker 3. For example, the tilting operation of the seat portion 8 from A in FIG. 16 to D in FIG. 16 is set so as to be repeated at a cycle in which the worker 3 takes approximately two steps.

  In addition, when the drive motor 46 is rotationally driven so that the second rotating shaft 31 rotates in the forward direction from the back side via the second worm gear 36, the seat portion 8 of the seat surface tilting chair 1 is shown in FIG. The tilting operation is repeated in the reverse order of the order shown. That is, the seat 8 is in the state of FIG. 16A to the state of FIG. 16D, from the state of FIG. 16D to the state of FIG. 16C, from the state of FIG. 16C to the state of FIG. The tilting operation is repeated from the state 16B to the state A in FIG.

  As described above in detail, in the seat tilting chair 1 according to the present embodiment, the seat 8 is periodically in a horizontal state by turning on the power switch 7 and rotationally driving the drive motor 46 of the tilting unit 11. From the left to the left diagonally forward direction and the right diagonally forward direction are alternately inclined by a predetermined inclination angle. For this reason, the seated worker 3 periodically applies a predetermined load smaller than the body weight to the left and right feet alternately, so that while performing office work in the seated state, appropriate training of lower limb muscle strength according to walking Can be performed.

  Further, by rotating the drive motor 46, the first rotating shaft 51 arranged so as to be orthogonal to each other via the first worm 40 and the second worm 38 formed on the outer peripheral surface of one worm shaft 41. And the 2nd rotating shaft 31 is rotationally driven and the periodic inclination operation | movement of the seat part 8 is realizable. As a result, the rotational movement of the tilting unit 11 around the two orthogonal rotation axes 23 and 29 can be realized with a simple configuration, and the number of parts can be reduced and the size can be reduced. It becomes possible to arrange | position easily between the leg part 9.

  Further, the rotational driving force of the driving motor 46 is transmitted from the worm shaft 41 connected to the motor shaft 47 of the driving motor 46 to the first rotating shaft 51 and the second rotating shaft 31 through the worm gears 39 and 36. Therefore, the reduction ratio can be easily increased, and the inclination period of the seat portion 8 can be set to have an appropriate walking speed. Further, by attaching the tilting unit 11 between the leg portion 9 and the seat portion 8 of the seat surface tilting chair 1, the seat surface tilting chair 1 can be produced and can be easily manufactured and the production cost can be reduced. Can do.

  In addition, the drive motor 46 that rotationally drives the worm shaft 41 can be disposed closer to the leg column member 13 side than the second rotation shaft 31, and the center of gravity of the tilting unit 11 is further brought closer to the leg column member 13, The position of the center of gravity of the seat surface tilting chair 1 can be easily arranged in the vicinity of the central axis of the leg portion 9. Further, since the drive motor 46 is attached to the bottom surface portion of the swing frame member 21, the drive motor 46 can be easily disposed between the swing frame member 21 and the leg portion 9, and the swing frame member Accordingly, the tilting unit 11 can be easily disposed between the seat portion 8 and the leg portion 9.

  Furthermore, the rotational driving force of the drive motor 46 is transmitted to the first rotating shaft 51 via the first worm gear 39 set to a reduction ratio of 1/2 of the reduction ratio by the second worm gear 36. Thus, with respect to one vertical movement of the seat mounting member 17, the swing frame member 21 is accurately returned to the horizontal state again after being tilted from the horizontal state to the left side or the right side. Thus, the seat 8 can be tilted accurately by a predetermined tilt angle alternately in the left diagonally forward direction and right diagonally forward direction.

  In addition, this invention is not limited to the said embodiment, Of course, various improvement and deformation | transformation are possible within the range which does not deviate from the summary of this invention. For example, the following may be used.

(A) For example, the left and right arrangement positions of the drive motor 46 and the worm shaft 41 and the first rotation shaft 51 are switched, and the second worm wheel 37 is disposed at the left edge of the second rotation shaft 31. May be.
(B) Further, for example, a speed setting button for changing and setting the rotational speed of the drive motor 46 is provided on the side surface of the control box 6 and the tilting unit 11, and the operator 3 operates the speed setting button to drive the drive motor 46. You may comprise so that the rotation speed of this may be changed and the period of inclination operation | movement of the seat part 8 may be changed.

  (C) Further, for example, the control box 6 is disposed on the lower surface portion of the seat portion 8, the upper surface portion, the side surface portion, the lower surface portion, or the like of the tilting unit 11, or is accommodated in the swing frame member 21 of the tilting unit 11. You may do it. Further, the power switch 7 may be disposed on the side surface or the lower surface of the tilting unit 11.

DESCRIPTION OF SYMBOLS 1 Seat surface tilting chair 8 Seat part 9 Leg part 11 Tilt unit 13 Leg support | pillar member 15 Fixed frame member 17 Seat part mounting member 21 Oscillating frame member 31 2nd rotating shaft 35 Vertical link bar 36 2nd worm gear 37 2nd worm wheel 38 second worm 39 first worm gear 40 first worm 41 worm shaft 45 shaft joint 46 drive motor 47 motor shaft 51 first rotating shaft 56 first worm wheel 65 swing link bar

Claims (8)

Legs,
A seat where the user sits;
Provided between the seat portion and the leg portion, the seat portion is inclined so as to be lowered from the basic position to one end edge side in the first direction perpendicular to the vertical direction, and at the same time in the vertical direction. Inclined so as to be lowered toward the first edge in the second direction perpendicular to the first direction and then returned to the basic position, and again one edge in the first direction At the same time as tilting down to the second end edge side in the second direction opposite to the first end edge side in the second direction, and then returning to the basic position again A tilting unit that tilts periodically,
With
The tilting unit is
A first rotating shaft disposed on the axis of the first direction and rotatably supported;
A first worm wheel attached to the first rotating shaft;
A second rotating shaft disposed on the axis in the second direction and rotatably supported;
A second worm wheel attached to the second rotating shaft;
A worm shaft in which a first worm meshing with the first worm wheel and a second worm meshing with the second worm wheel are provided on a coaxial line and rotatably supported;
A drive motor for rotationally driving the worm shaft;
Have
When the tilting unit tilts the seat portion from the basic position to the one edge portion side in the first direction via the second worm and the second worm wheel by rotational driving of the worm shaft. At the same time, the seat portion is inclined via the first worm and the first worm wheel so as to be lowered from the basic position to the first end edge side in the second direction or the second end edge side in the second direction. A seat surface tilting chair, characterized in that The leg has a leg support member erected in the vertical direction,
The tilting unit has a fixed frame member fixed to the leg strut member,
The drive motor has a motor shaft coupled to the worm shaft via a shaft coupling,
The said 2nd rotating shaft is arrange | positioned with respect to the said leg support | pillar member at the one edge part side of the said 1st direction of the said seat part rather than the said worm shaft. Seat tilt chair. The tilting unit is
A swinging frame member attached to the fixed frame member so as to be swingable about a rotation axis in the first direction;
The seat is disposed on the upper side of the swinging frame member and the seat is attached to the upper side, and an edge portion of the seat facing the one end edge in the first direction is opposed to the swinging frame member. A seat mounting member swingably mounted about the rotation axis in the second direction;
One end side is eccentrically attached to each of both end portions of the second rotating shaft, and the other end side is attached to an end edge portion of the seat mounting member that is swingably mounted. A pair of upper and lower link members rotatably attached to the edge portions on the free end side in the first direction opposite to each other;
An oscillating link member having one end side eccentrically attached to the outer end portion of the first rotating shaft and rotatably attached to the axis of the first rotating shaft, and the other end side rotatably attached to the fixed frame member;
Have
The seat surface tilting chair according to claim 2, wherein the drive motor is attached to a bottom surface portion of the swing frame member.   4. The reduction ratio of the first worm and the first worm wheel is ½ of the reduction ratio of the second worm and the second worm wheel. 5. The seat tilting chair described. A tilting unit provided between a leg of a chair and a seat on which a user sits,
A first rotating shaft disposed on an axis in a first direction perpendicular to the vertical direction and rotatably supported;
A first worm wheel attached to the first rotating shaft;
A second rotating shaft that is arranged on an axis in a second direction perpendicular to the vertical direction and orthogonal to the first direction, and is rotatably supported;
A second worm wheel attached to the second rotating shaft;
A worm shaft in which a first worm meshing with the first worm wheel and a second worm meshing with the second worm wheel are provided on a coaxial line and rotatably supported;
A drive motor for rotationally driving the worm shaft;
With
At the same time as the seat portion is inclined from the basic position to one end edge side in the first direction via the second worm and the second worm wheel by the rotational drive of the worm shaft, The second direction opposite the first end edge side in the second direction or the first end edge side in the second direction from the basic position via the worm and the first worm wheel. Incline so as to descend toward the second end edge side of the
The seat is tilted so as to be lowered from the basic position toward one end edge in the first direction, and at the same time is tilted so as to be lowered toward the first edge in the second direction, and then returned to the basic position. Then, the cycle is again inclined so as to be lowered toward one end edge in the first direction, and at the same time inclined so as to be lowered toward the second edge in the second direction, and then returned to the basic position again. Tilt unit characterized by tilting automatically. A fixed frame member fixed to a leg strut member erected in the vertical direction of the leg,
The drive motor has a motor shaft coupled to the worm shaft via a shaft coupling,
The said 2nd rotating shaft is arrange | positioned with respect to the said leg support | pillar member at the one edge part side of the said 1st direction of the said seat part rather than the said worm shaft. Tilt unit. A swinging frame member attached to the fixed frame member so as to be swingable about a rotation axis in the first direction;
The seat is disposed on the upper side of the swinging frame member and the seat is attached to the upper side, and an edge portion of the seat facing the one end edge in the first direction is opposed to the swinging frame member. A seat mounting member swingably mounted about the rotation axis in the second direction;
One end side is eccentrically attached to each of both end portions of the second rotating shaft, and the other end side is attached to an end edge portion of the seat mounting member that is swingably mounted. A pair of upper and lower link members rotatably attached to the edge portions on the free end side in the first direction opposite to each other;
An oscillating link member having one end side eccentrically attached to the outer end portion of the first rotating shaft and rotatably attached to the axis of the first rotating shaft, and the other end side rotatably attached to the fixed frame member;
With
The tilting unit according to claim 7, wherein the drive motor is attached to a bottom surface portion of the swing frame member.   8. The reduction ratio of the first worm and the first worm wheel is ½ of the reduction ratio of the second worm and the second worm wheel. 8. The tilting unit described.

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