JP2004267410A - Height adjustable chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a height adjustable chair a sitting person can manually adjust its height, which requires neither external power nor operation by someone but the sitting person. <P>SOLUTION: A pantographic elevating mechanism 300 is provided between a seat part 100 and a foot part 200. A height adjusting mechanism 400 to adjust its height includes a decelerating mechanism 500, an accelerating mechanism 600, and an operating lever 700 equipped on a side of a seat. The decelerating mechanism 500 has a ball screw 502 and a ball nut 504, which keep a position of the elevating mechanism with predetermined friction and activate the elevating mechanism for height adjustment. The accelerating mechanism 600 has an externally toothed gear 602 mounted on a tip of the ball screw and an internally toothed gear 604 to interengage it, and the operating lever 700 is directly connected with the internally toothed gear 604. Therefore, a driving force by the operating lever is accelerated by the accelerating mechanism 600 and effectively transmitted to the decelerating mechanism 500, which effectively achieves keeping and driving of the elevating mechanism by the decelerating mechanism 500. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a height-adjustable chair, and more particularly to a height-adjustable chair suitable for use in a washing place such as a bathroom.
[0002]
[Prior art]
For example, it is more convenient to adjust the height of an assisting device such as a chair or a pedestal used in a washing place such as a bathroom according to the body type of a user. For example, at the time of transfer to a bathtub or washing, if the seating surface is not low to some extent, stability is impaired, which is dangerous. Therefore, if the height of the seating surface can be freely adjusted while seated at the time of sitting, standing up, and other operations, it is very convenient and effective.
[0003]
Some conventional height-adjustable chairs use a motor or air pressure or hydraulic pressure as a driving force (see Utility Model Document 1 or Patent Document 2). In addition, an elevating bathing wheelchair has been proposed as an elevating type and applied at the time of bathing (see Patent Document 3).
[0004]
For example, in the chair according to Utility Model Document 1, a link mechanism of the same configuration is provided on both sides of the left and right armrests of the seat chair, and the link mechanism has lower ends at a pair of front and rear gears provided in mesh with the support member. A pair of lower links having fixed portions, and a pair of upper links connected to each of the lower links and connected in a cross-like manner. A pulley provided at the upper rear end of the upper link is engaged along a guide groove consisting of a horizontal groove of a guide plate fixed to the side surface and a slope groove continuously descending from the horizontal link, and is connected to the front and rear lower links. By rotating a screw rod screwed into a female screw member provided on the connection member with the upper link by a motor, the chair is raised in parallel to a certain height, and the raised chair is tilted forward. It was like . In other words, the seat chair can be raised and lowered and the seat portion raised and lowered is tilted forward, so that the occupant can easily stand up or sit down. In this case, a screw rod screwed between the links is provided. Is driven by a motor.
[0005]
The chair according to Patent Literature 2 has a lifting girder having freely mounted small wheels arranged side by side on the left and right sides of a base frame, and a lifting mechanism for moving the lifting girder up and down in a horizontal state is provided on the base frame. A set of seat frames is attached via a pair of pantograph mechanisms, a seat frame height adjustment mechanism is provided between the base frame and the pantograph mechanism to adjust and fix the height of the seat frames, and a lifting mechanism and a seat frame height adjustment mechanism are provided. An operation mechanism that allows a person sitting on a chair to operate the apparatus while sitting on the chair is provided at an appropriate position on the chair body, and uses pneumatic or hydraulic pressure as power.
[0006]
The chair according to Patent Literature 3 is an elevating bathing wheelchair, and includes a movable dolly, an elevating mechanism mounted on the dolly, and a seat supported by the elevating mechanism. An X frame pivotally attached to the lower plate, a nut pivotally attached to one of the lower ends of the X frame, a screw shaft screwed to the nut to move the nut in a horizontal direction, and a rotation to rotate the screw shaft It consisted of a mechanism, a one-way clutch screwed to the screw shaft, and a descending pedal for releasing the clutch action of the one-way clutch. That is, the height of the seat portion is adjusted by the assistant using the pedal to assist the occupant during bathing.
[0007]
[Utility Model Document 1] Utility Model Registration No. 057628
[Patent Document 2] JP-A-8-38296
[Patent Document 3] JP-A-8-32290
[0008]
[Problems to be solved by the invention]
However, in the above-described conventional technology, for example, the chairs according to the first and second documents are configured to move up and down the seat portion by a motor or an external power such as a pneumatic or hydraulic pressure as a driving force, so that the chair becomes expensive. There was a problem. In addition, when an external power is used, when used around water in a bathroom or the like, a waterproof treatment or the like is required, and there is a problem that the construction is troublesome and further expensive. In other words, when applied to a bathroom or the like, when using an external power source, it is a place where the temperature is high and the humidity is high.
[0009]
On the other hand, in the chair according to the third document, since the assistant lifts and lowers the seat portion behind the chair by using a pedal or the like, the seated person cannot perform the operation according to the intention of the seated person. There is a problem that a person may misunderstand the state of the seated person or cause a danger to the seated person due to an operation error of the caregiver or the like.
[0010]
The present invention has been made in view of the above circumstances, and does not require an external power source or an assistant, and provides an inexpensive height-adjustable chair that can be manually adjusted by the user himself. The purpose is to provide.
[0011]
[Means for Solving the Invention]
A height-adjustable chair according to the present invention is a height-adjustable chair formed so that the height of the seat can be manually adjusted in a state where the user himself is sitting on the seat to solve the above problem. The chair comprises a seat portion (100) on which a user sits, a pantograph-shaped elevating mechanism (300) for supporting the seat portion so as to be able to move up and down, and a height to be driven when adjusting the height of the elevating mechanism. The height adjusting mechanism includes an adjusting mechanism (400) and a leg (200) that supports the seat via the elevating mechanism. The height adjusting mechanism raises one link arm (302a, 302b) on the seat side of the elevating mechanism. A speed-reducing means that is slid and driven for adjustment, the speed-reducing means (500) for supporting the link arm so as not to slide by frictional force in a steady state, and a manual operation of the speed-reducing means connected to the speed-reducing means. Drive Includes a speed increasing means (600) for increasing and transmitting power, and an operating lever (700) connected to the speed increasing means, the operating lever extending to the side of the seat portion. By this, the user himself sitting on the seat operates the operation lever, and the driving force is effectively transmitted to the speed reduction means via the speed increasing means to freely move the elevating mechanism up and down, thereby increasing the height of the seat surface. Adjust the length. Further, when the height adjustment operation is not performed, the link of the lifting mechanism is supported by the speed reduction means by the frictional force of the speed reduction means, and the height of the seat surface is maintained.
[0012]
In this case, since the elevating mechanism is formed by a two-stage pantograph-shaped link mechanism, the range of height adjustment of the seat surface can be widened according to the user's body type or its operation.
[0013]
Further, since the deceleration means is formed by the ball screw (502) and the ball nut (504) which are screwed together with a predetermined frictional force, the effective frictional force and the seating height can be maintained by a simple mechanism to maintain the height of the seating surface. An effective driving force for adjusting the height of the surface is obtained.
[0014]
Further, since the speed increasing means is formed by the external gear (602) provided at the end of the ball screw of the speed reducing means and the internal gear (604) screwed to the external gear, the speed increasing means is simplified. By such a mechanism, the manual driving force can be effectively transmitted to the speed reduction means.
[0015]
In addition, the operation lever is driven by only one or the other, and is connected to the speed increasing means via a switching type ratchet mechanism that idles to the other or one, so that the user can easily operate the operation lever with a simple mechanism. Can be handled.
[0016]
Furthermore, a bellows-like cover (800) that covers the elevating mechanism and expands and contracts in accordance with the vertical movement of the seat by the driving thereof is provided between the seat and the legs, so that the seat can be moved up and down. Safety can be ensured by preventing pinching or the like in the elevating mechanism or the like during movement.
[0017]
On the other hand, a cover (900) may be provided between the seat portion and the leg portion, which covers the elevating mechanism, and in which a plurality of slide cases slide and expand and contract according to the up and down movement of the seat portion by the drive. Similar pinching or the like can be prevented when the seat is vertically moved by the mechanism, thereby ensuring safety.
[0018]
In addition, since the legs are provided with movable casters (205a, 205b) which are grounded and movable when the chair body is inclined at a predetermined angle, the legs can be freely moved by a simple configuration. Can do.
[0019]
Further, since the leg portion is provided with a kick allowance (Lsk) protruding forward from the seat portion, the leg portion can effectively act when the user stands up.
[0020]
Further, the leg portion supports the entire chair by grounding a plurality of locations, and it is preferable to provide an adjuster mechanism for height adjustment at each of the plurality of locations.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of a height-adjustable chair according to the present invention will be described in detail with reference to the accompanying drawings. 1 and 2 show one embodiment of a height-adjustable chair according to the present invention. The height-adjustable chair according to the present embodiment is a chair formed so that the height can be manually adjusted in a state where the user is seated, and is a pantograph-shaped chair provided between the seat portion 100 and the leg portion 200. The elevation mechanism 300 is manually driven via a height adjustment mechanism 400 to adjust the height of the seat 100 so as to be adjustable. In particular, the height-adjustable chair according to the present embodiment includes a deceleration mechanism 500 that drives the elevating mechanism 300 during the height adjustment while the height adjusting mechanism 400 maintains the position of the elevating mechanism 300 by a predetermined frictional force, The main feature is that it is formed by a speed increasing mechanism 600 that transmits the driving force from the operating lever 700 to the speed reducing mechanism 500 at an increased speed.
[0022]
Explaining the details of each part, the height-adjustable chair according to the present embodiment includes, as shown in FIGS. 1 and 2, a seat part 100, legs 200, a lifting mechanism 300, and a height adjustment mechanism 400. Including. In the seat portion 100, a substantially square seat frame 104 is attached to a lower surface or an inner side of a substantially flat seat plate 102 having a seat surface on which a user sits. In the present embodiment, as shown in FIG. 3, the seat frame 104 is closer to one of the inner sides of the front frame 104 a and the rear frame 104 b (to the right in FIG. 1 (in FIG. 3, the opposite side of FIG. 1 is shown). ), The slide plates 106a and 106b for guiding the link arms 302a and 302b of the lifting mechanism 300 are mounted so as to be substantially horizontal. Further, in the present embodiment, as shown in FIG. 2, the rear frame 104 b of the seat frame 104 is provided with a slightly upwardly curved rod-shaped mounting portion 108, and the backrest 110 is mounted near the upper end thereof. I have.
[0023]
The leg 200 is a stabilizing mechanism that supports the seat 100 via the elevating mechanism 300. In the present embodiment, for example, as shown in FIG. 4, four disc-shaped leg pedestals 202a to 202d with adjusters are provided. Having. These leg pedestals 202a to 202d have rear leg pedestals 202c and 202d arranged substantially in parallel. Each of the pedestals 202a to 202d is provided with an adjuster for individually adjusting the height by an arbitrary method such as a screw type or a slide type. The distance between the front leg pedestal 202a and the rear leg pedestal 202c is widened so that the lever operation side maintains stability. In the present embodiment, as will be described later, there is provided a kick-in allowance that acts as a stepping-stone when a seated person stands up by a large distance between the front leg bases 202a and 202b. Each of the leg pedestals 202a to 202d has a projection formed at a substantially central portion thereof so as to protrude upward, and the leg frames 204a to 204d are assembled and fixed to the projection in a rectangular frame shape. The leg frames 204a to 204d are attached so that the operation side frame 204a is bridged between the leg pedestals 202a and 202c, and the non-operation side frame 204b is placed between the leg pedestals 202b and 202d similarly to the operation side. Installed. In the vicinity of the rear ends of the leg frames 204a and 204b on both sides, transfer casters 205a and 205b are attached at positions facing each other. The moving casters 205a and 205b are in a floating state when the chair is used, and are grounded when the chair body is inclined backward, and are movable. On the other hand, between the leg frames 204a and 204b on both sides, support frames 204c and 204d for supporting the lower end of the elevating mechanism 300 are attached so as to be substantially orthogonal to the leg frames 204a and 204b on both sides. As shown in FIG. 3, one of the link arms 302c, 302d at the lower stage of the elevating mechanism 300 is slidably provided inside the support frames 204c, 204d, similarly to the seat frame frames 104a, 104b of the seat portion 100, as shown in FIG. The supporting slide plates 206a and 206b are respectively attached.
[0024]
The stabilizing mechanism of the leg 200 of the present embodiment will be described with reference to FIG. 9. As shown in FIG. The distance from the reference line to the position of the end is Lsf, the distance from the reference line to the position of the front end on the non-operation side of the leg is L1bf, the position of the front end of the front surface and the position of the front end of the leg 200 on the non-operation side. Lsk is the difference between the two, the distance from the reference line to the center line of the leg base 202a on the operation side is L1fo, the distance from the reference line to the center line of the leg base 202b on the non-operation side is L1fn, Assuming that the distance from the reference line to the position of the rear end of the seating surface is Lsb, and the distance from the reference line to the position of the center line of the rear leg pedestal 202c (202d) is L1b, the respective distances are the front and rear stability. To ensure the following Having.
Lsk <L1fo
Lsb <L1b
Further, in the present embodiment, the kick-in allowance Lsk is configured to be equal to or longer than a predetermined distance. In addition, the front leg position L1fk on the non-operation side is disposed on the leg frame 204b so as not to be in the way when transferring to a chair or washing the body in the present embodiment.
[0025]
On the other hand, in this embodiment, the lifting mechanism 300 is a two-stage pantograph-shaped link mechanism as shown in FIG. 3, and one of the upper and lower link arms 302 a to 302 d slides on the seat portion 100 and the leg portion 200. The other link arms 302e to 302h are rotatably connected to the seat portion 100 and the leg portion 200, respectively. More specifically, in the upper link, the link arms 302a and 302e are arranged with their central portions intersecting on the front side, and similarly, the link arms 302b and 302f are arranged with their central portions intersecting on the rear side. The respective intersections are rotatably connected by a first link shaft 304a. Also, the vicinity of the distal end of one of the link arms 302a and 302b is attached to a second link shaft 304b, and slide rollers 306a and 306b are attached to both ends of the link shaft 304b. The frames 104c and 104d are slidable along slide plates 106a and 106b. The other link arms 302e and 302f are rotatably attached to seat frames 104a and 104b of the seat unit 100 via link auxiliary shafts 308a and 308b, respectively.
[0026]
In the lower link, link arms 302c and 302g are arranged with their center portions crossing on the front side, and similarly, link arms 302d and 302h are arranged with their center portions crossing on the rear side. The intersection is rotatably connected by a third link shaft 304c. Also, the vicinity of the distal ends of the link arms 302c and 302d is attached to a fourth link shaft 304d, and slide rollers 306c and 306d are attached to both ends of the link shaft 304d to support the leg 200. The frames 204d and 204c are slidable along slide plates 206a and 206b. The other link arms 302g and 302h are rotatably attached to the leg frames 204c and 204d of the leg 200 via link auxiliary shafts 308c and 308d, respectively. Further, the upper end of the lower link arm 302c and the lower end of the upper link arm 302a intersect at the end thereof, and the lower link arm 302d and the lower end of the upper link arm 302b intersect at the end thereof. And their intersections are rotatably connected by a fifth link shaft 304e. Further, the upper end of the lower link arm 302g and the lower end of the upper link arm 302e intersect at the end, and the upper end of the lower link arm 302h and the lower end of the upper link arm 302f are at the end. And these intersections are connected by a sixth link shaft 304f to form a pantograph-like link mechanism.
[0027]
On the other hand, the height adjusting mechanism 400 is a part unique to the present embodiment that manually drives the elevating mechanism 300 to adjust the height of the seat surface. In the present embodiment, the speed reducing mechanism 500, the speed increasing mechanism 600 , An operation lever 700. The speed reduction mechanism 500 is formed by screwing a ball screw 502 and a ball nut 504 having a predetermined speed reduction ratio. The ball screw 502 and the ball nut 504 expand and contract their entire lengths with the screw advance / retreat movement. At this time, the slide-side link shaft 304b linked to the ball nut 504 is slid horizontally on the slide plate 106. That is, the non-threaded side of the ball nut 504 is connected to the support tube 506, and the distal end of the support tube 506 is loosely connected to the link shaft 304b on the slide side of the upper link in the lifting mechanism 300 as shown in FIG. The connection pipe 508 is fitted and fitted. The speed increasing mechanism 600 includes an external gear 602 attached to an end of the ball screw 502 of the reduction mechanism 500, and an internal gear 604 that meshes with the external gear 602. The external gear 602 is rotatably supported inside a fixed box (not shown) attached to the lower surface of the seat part 100. Further, a connection plate 606 indicated by a chain line is fixed integrally to the outer surface of the internal gear 604 and the internal gear 604, and a mounting shaft 608 to which the operation lever 700 is mounted is fixed substantially at the center of the connection plate 606. I have. The operation lever 700 is inserted into the mounting shaft 608 of the connection plate 606 via a ratchet mechanism (not shown) so that the operation lever 700 rotates only in one or the other and idles in the other or the one. FIG. 5 shows a switching lever 702 for switching the ratchet.
[0028]
Further, in the present embodiment, as shown in FIG. 6, for example, a cover 800 is attached between the seat portion 100 and the leg portion 200 so as to cover the elevating mechanism 300. In the present embodiment, a bellows mechanism that expands and contracts when the seat unit 100 moves up and down by driving the elevating mechanism 300 is advantageously applied to the cover 800 in the present embodiment.
[0029]
Next, the operation of the height-adjustable chair according to the above embodiment will be described. First, when the seat surface is raised in the seated state, the switching lever 702 of the ratchet is switched to the raised side. For example, as shown by a solid line in FIG. 5, when the operation of the operation lever 700 in the X direction, that is, the operation of pushing the operation lever 700 in the opposite direction is an upward movement, when the operation lever 700 is operated in the rotation direction X, the ratchet mechanism operates. Only when the lever 700 is operated in the X direction, the attachment shaft 608 of the operation lever 700 is rotated in the X direction, and when the operation lever 700 is pulled in the Y direction, that is, when the operation shaft 700 is idled, the attachment shaft 608 of the operation lever 700 is idled. And do not rotate. Thus, the operation of the operation lever 700 causes the mounting shaft 608 of the operation lever 700 to rotate only in the X direction. When the mounting shaft 608 rotates in the X direction, the internal gear 604 rotates in the X direction via the connection plate 606 with the rotation. Next, when the internal gear 604 rotates in the X direction, the external gear 602 at the tip of the ball screw 502 that meshes with the internal gear 604 rotates in the X direction. Next, when the external gear 602 rotates in the X direction, the ball screw 502 rotates in the X direction integrally with the rotation.
[0030]
When the ball screw 502 rotates in the X direction, the total length of the ball screw 502 and the ball nut 504 is reduced by screwing the ball screw 502 and the ball nut 504, and the ball nut 504 slides in the Z direction. Thereby, the second link shaft 304b on one side of the upper stage of the lifting mechanism 300 connected to the ball nut 504 is pulled in the Z direction. When the second link shaft 304b is pulled in the Z direction, slide rollers 306a and 306b provided on both sides of the link shaft 304b slide in the Z direction while rotating on the frame plates 106a and 106b of the seat 100.
[0031]
Next, when the slide rollers 306a and 306b slide in the Z direction along the slide plates 106a and 106b of the seat portion 100, the distance between the second link shaft 304b and the link auxiliary shafts 308a and 308b shown in FIG. To go. As a result, the distance between the link shafts 304e and 304f and the distance between the link shaft 304d and the link auxiliary shafts 308c and 308d of the lifting mechanism 300 decrease. As a result, the distance between the seat portion 100 and the leg portion 200 increases due to the structure of the pantograph-like lifting mechanism 300, and the seat surface rises.
[0032]
Next, when lowering the seat surface, when the switching lever 702 of the ratchet is switched to the lowering side, the seat surface is lowered by the operation opposite to the above description. That is, when the operation lever 700 is operated, the mounting shaft 608 of the operation lever 700 rotates only in the Y direction indicated by the broken line in FIG. 5, and the rotation in the X direction idles. Accordingly, the internal gear 604 rotates in the Y direction in response to the rotation of the mounting shaft 608 in the Y direction. When the internal gear 604 rotates in the Y direction, the rotation causes the external gear 602 to rotate in the Y direction. Further, when the external gear 602 rotates in the Y direction, the ball screw 502 to which the external gear 602 is attached rotates in the Y direction, and moves the ball nut 504 in the W direction. As a result, the second link shaft 304b on one side of the upper link is pushed in the W direction, and one side of the link is placed on the slide plates 106a, 106b of the seat portion 100 by the rotation of the slide rollers 306a, 306b on both sides thereof. Slide in the W direction. As a result, the distance between the link shafts facing each other in the elevating mechanism 300 increases, and the seat surface descends.
[0033]
Next, as shown in FIG. 8, the case of moving the height-adjustable chair according to the present embodiment will be described. For example, when the backrest 110 is pushed down from the back of the backrest 110, the chair body falls down and the chair body falls forward. The leg pedestals 202a and 202b float. Further, when the chair body is tilted until the rear leg pedestals 202c and 202d rise, the moving casters 205a and 205b touch the floor and become movable. In this state, the chair can be easily moved by pushing or pulling.
[0034]
Next, as shown in FIG. 10, the position of the operation lever when transferring to the bathtub is shown. As shown in FIG. 10, when transferring to a bathtub or the like, transfer is performed with the operation lever 700 stopped at a position where the operation lever 700 does not hinder transfer.
[0035]
As described above, according to the height-adjustable chair of the present embodiment, the height of the pantograph-shaped elevating mechanism 300 provided between the seat portion 100 and the leg portion 200 includes the speed reduction mechanism 400 and the speed increasing mechanism 500. Since the operation can be performed by the operation lever 700 provided on the side of the seat portion 100 via the adjustment mechanism 400, a convenient height adjustment according to the intention of the seated person can be performed. In this case, since the elevating mechanism 300 is formed by a two-stage pantograph-shaped link mechanism, the range of adjusting the height of the seat surface can be widened according to the user's body type or its operation. Further, since the speed reduction mechanism 500 is formed by the ball screw 502 and the ball nut 504 that are screwed by a predetermined frictional force, the effective frictional force and the height of the seating surface are maintained by a simple mechanism. To adjust the effective driving force. Further, since the speed increasing mechanism 600 is formed by the external gear 602 provided at the end of the ball screw 502 of the reduction mechanism 500 and the internal gear 604 screwed to the external gear 602, the speed increasing mechanism 600 is simple. The mechanism allows the manual driving force to be effectively transmitted to the speed reduction mechanism 500. Further, the operation lever 700 is connected to the internal gear 604 of the speed increasing mechanism 600 via a switching type ratchet mechanism which is driven only by one or the other and idles to the other or one, so that it can be used by a simple mechanism. The user can easily handle the operation lever 700. On the other hand, between the seat portion 100 and the leg portion 200, a bellows-like cover 800 that covers the elevating mechanism 300 and expands and contracts in accordance with the vertical movement of the seat portion 100 due to its driving is provided. Safety can be ensured by preventing the elevating mechanism 300 from being pinched by a link or the like during vertical movement. On the other hand, since the casters 205a and 205b are provided so as to be movably contacted with the ground when the chair body is tilted at a predetermined angle, the chair can be freely moved with a simple configuration. Further, since the leg portion 200 is provided with a kick allowance Lk protruding forward from the seat portion 100, the user can easily stand up. Therefore, a safe and stable inexpensive chair can be provided.
[0036]
In the above embodiment, the reduction mechanism is configured by a combination of a ball screw and a ball nut. However, in the present invention, another reduction mechanism such as a combination of gears may be used. Further, in the above embodiment, the speed increasing mechanism is configured by a combination of the internal gear and the external gear, but in the present invention, if the driving force from the operation lever can be directly transmitted to the speed reducing mechanism, the speed reducing mechanism is not required. Other mechanisms may be used in the same manner as described above. Further, in the above-described embodiment, a pantograph-like link mechanism formed by connecting four link arms and forming a two-stage configuration is applied as the elevating mechanism. However, in the present invention, the number of link arms to be connected and the form of connection are as follows. The present invention is not limited to this embodiment, and can be arbitrarily changed according to the range of elevation and the size of the mechanism. Further, in the above embodiment, a bellows-shaped cover is applied, but in the present invention, for example, a several-stage slide case 900 or the like may be applied as shown in FIG. In the case shown in FIG. 7, the number of the slide cases is determined by the ratio of the heights of the elevations. For example, if the maximum height is less than three times the minimum height, three cases may be applied. Although the present embodiment has been described above, the present invention is not limited to the above-described embodiment, and it will be apparent to those skilled in the art that various modifications, improvements, and combinations can be made.
[0037]
【The invention's effect】
As described above, according to the height-adjustable chair of the present invention, the height-adjustable chair formed so that the height of the seat can be manually adjusted in a state where the user himself is sitting on the seat. A seat portion on which a user sits, a pantograph-shaped elevating mechanism that supports the seat portion so as to be able to move up and down, a height adjustment mechanism that is driven when adjusting the height of the elevating mechanism, and a seat via the elevating mechanism. A height adjusting mechanism is a deceleration means that slides and drives one of the link arms on the side of the seat of the elevating mechanism when adjusting the height. A speed reducing means for supporting the link arm so as not to slide, a speed increasing means connected to the speed reducing means for increasing the speed of the manual driving force to be transmitted to the speed reducing means, and an operating lever connected to the speed increasing means. And extend to the side of the seat Since the control lever is provided, the user himself sitting on the seat operates the control lever, and the driving force is effectively transmitted to the deceleration means via the speed increasing means to freely move the lifting mechanism up and down. To adjust the height of the seating surface. Further, when the height adjustment operation is not performed, the link of the lifting mechanism is supported by the speed reduction means by the frictional force of the speed reduction means, and the height of the seat surface can be effectively maintained. Therefore, the occupant himself can easily perform desired height adjustment according to his / her own intention without using external power.
[0038]
According to the height-adjustable chair according to claim 2 of the present invention, since the elevating mechanism is formed by the two-stage pantograph-shaped link mechanism, the seating surface can be adjusted according to the user's body type or its operation. Height adjustment range can be widened.
[0039]
According to the height-adjustable chair according to claim 3 of the present invention, since the speed-reducing means is formed by the ball screw and the ball nut screwed together by a predetermined frictional force, the height of the seat surface can be reduced by a simple mechanism. An effective frictional force to be maintained and an effective driving force to adjust the height of the seating surface can be obtained.
[0040]
According to the height-adjustable chair according to claim 4 of the present invention, the speed increasing means comprises an external gear provided at the end of the ball screw of the speed reducing means, and an internal gear engaged with the external gear. Therefore, the manual driving force can be effectively transmitted to the speed reduction means by a simple mechanism.
[0041]
According to the height-adjustable chair according to claim 5 of the present invention, the operation lever is driven by only one or the other, and is connected to the speed increasing means via a switching type ratchet mechanism that idles to the other or one. Therefore, the user can easily handle the operation lever with a simple mechanism.
[0042]
According to the height-adjustable chair according to claim 6 of the present invention, between the seat and the leg, a bellows-like cover that covers the elevating mechanism and expands and contracts according to the vertical movement of the seat due to its driving. Is provided, it is possible to prevent the seat from being caught in an elevating mechanism or the like when the seat surface moves up and down, thereby ensuring safety.
[0043]
According to the height-adjustable chair according to claim 7 of the present invention, the lifting mechanism is covered between the seat portion and the leg portion, and a plurality of slide cases slide according to the vertical movement of the seat portion driven by the driving mechanism. Since the cover is provided so as to expand and contract, the same kind of pinching or the like can be prevented when the seating surface is moved up and down by the elevating mechanism, thereby ensuring safety.
[0044]
According to the height-adjustable chair according to claim 8 of the present invention, since the leg is provided with a movable caster that is grounded and movable when the chair body is inclined at a predetermined angle. It can be moved freely with a simple configuration.
[0045]
According to the height-adjustable chair according to the ninth aspect of the present invention, since the leg is provided with a kick-in allowance protruding forward from the seat, the user can easily stand up.
[0046]
According to the height-adjustable chair according to claim 10 of the present invention, the legs support the entire chair by grounding a plurality of locations, and an adjuster mechanism for height adjustment is provided at each of the plurality of locations. Since the chair can be adjusted to a height that is easy to stabilize according to the inclination and unevenness of the floor where the chair is grounded, use the chair after adjusting it to a stable state with the most comfortable posture of the occupant I can do it.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of a height-adjustable chair according to the present invention.
FIG. 2 is a side view showing a side surface of the height-adjustable chair according to the embodiment of FIG. 1;
FIG. 3 is a perspective view showing an example of a lifting mechanism applied to the height-adjustable chair according to the embodiment of FIG. 1;
FIG. 4 is a perspective view showing an example of a leg applied to the height-adjustable chair according to the embodiment of FIG. 1;
5 is a partial exploded perspective view showing an example of a height adjusting mechanism applied to the height-adjustable chair according to the embodiment of FIG. 1;
FIG. 6 is a side view showing an example of a cover applied to the height-adjustable chair according to the embodiment of FIG. 1;
FIG. 7 is a side view showing another example of the cover applied to the height-adjustable chair according to the embodiment of FIG. 1;
FIG. 8 is a side view for explaining the operation of the height-adjustable chair according to the embodiment of FIG. 1;
FIG. 9 is a side view illustrating a stabilizing mechanism of the height-adjustable chair according to the embodiment of FIG. 1;
FIG. 10 is a partial side view for explaining the operation of the height-adjustable chair according to the embodiment of FIG. 1;
[Explanation of symbols]
100 seats
102 frame
104 seat frame
106a, 106b slide plate
200 legs
202a-202d leg pedestal
204a-204d leg frame
205a, 205b Transfer casters
206a, 206b slide plate
300 lifting mechanism
302a-302h Link arm
304a to 304f Link axis
306a-306d slide roller
308a-308b Link auxiliary shaft
400 Height adjustment mechanism
500 Reduction mechanism
502 Ball screw
504 ball nut
506 Support tube
508 Connection pipe
600 Speed increasing mechanism
602 external gear
604 Internal gear
606 Connection plate
608 Mounting shaft
700 Control lever
702 Switching lever

Claims (10)

A height-adjustable chair that is formed so that the height of the seat can be manually adjusted in a state where the user himself is sitting on the seat,
The chair includes a seat portion on which a user sits, a pantograph-like elevating mechanism for supporting the seat portion so as to be able to move up and down, a height adjusting mechanism that is driven when adjusting the height of the elevating mechanism, and a lifting mechanism. And the legs supporting the seat portion,
The height adjustment mechanism is a deceleration means that slides and drives one of the link arms on the seat portion side of the lifting mechanism when adjusting the height, and supports the link arm so as not to slide due to frictional force in a steady state. A speed-reducing means connected to the speed-reducing means, a speed-increasing means connected to the speed-reducing means for manually increasing the driving force to be transmitted to the speed-reducing means, and an operation lever connected to the speed-increasing means, A height-adjustable chair, comprising: an operating lever provided so as to extend to the chair. 2. The height-adjustable chair according to claim 1, wherein the lifting mechanism is formed by a two-stage pantograph-like link mechanism. The height-adjustable chair according to claim 1 or 2, wherein the speed-reducing means is formed by a ball screw and a ball nut screwed together by a predetermined frictional force. 4. The height-adjustable chair according to claim 3, wherein the speed increasing means is formed by an external gear provided at an end of the ball screw of the speed reducing means, and an internal gear engaged with the external gear. Height adjustable chair. The height-adjustable chair according to any one of claims 1 to 4, wherein the operation lever is driven by only one or the other, and is connected to the speed-increasing means via a switchable ratchet mechanism that idles to the other or one. A height-adjustable chair that is connected. The height-adjustable chair according to any one of claims 1 to 5, wherein an elevating mechanism is covered between the seat and the leg, and the seat is moved up and down by driving the elevating mechanism. A height-adjustable chair provided with a bellows-like cover that expands and contracts. The height-adjustable chair according to any one of claims 1 to 5, wherein an elevating mechanism is covered between the seat and the leg, and the seat is moved up and down by driving the elevating mechanism. A height-adjustable chair comprising a cover in which a plurality of slide cases slide and expand and contract. In the height-adjustable chair according to any one of claims 1 to 7, the leg portion is provided with a transfer caster that is movably grounded when the chair body is inclined at a predetermined angle. A height-adjustable chair, characterized in that: The height-adjustable chair according to any one of claims 1 to 8, wherein the leg is provided with a rise allowance protruding forward from the seat. The height-adjustable chair according to any one of claims 1 to 9, wherein the leg portion supports the entire chair by grounding a plurality of locations, and an adjuster mechanism for adjusting the height at each of the plurality of locations. A height-adjustable chair, characterized in that a chair is provided.

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