JPH06181827A - Rotary chair with feet placing base - Google Patents

Abstract

PURPOSE:To provide a rotary chair with a feet placing base, which can be used by adjusting height of the placing base, as well so as to become suitable for the seat part, when height of the seat part is adjusted in accordance with physique of a seated person, in the rotary chair which can be adjusted as to height of the against a leg part by taking notice of a fact that length under knees is also varied in similar figures in accordance with physique of the seated person. CONSTITUTION:In the rotary chair by which height of a seat part 2 can be adjusted against a leg part 1, this rotary chair constituted so that height can be adjusted by interlocking a feet placing base 3 provided in a suitable part of the leg part and the part by an ascending/descending mechanism 16, and also, an ascent/descent variation of the feet placing base is set larger by constant multiple than an ascent/descent variation of the seat part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swivel chair with a footrest applicable to seated persons having different physiques from adults to children.

[0002]

2. Description of the Related Art A conventional chair for school children has a structure in which the height of the seat can be adjusted with respect to the legs and the height of a footrest plate attached to the legs can also be adjusted. Has already been provided, this type of school chair has a non-rotating seat.

On the other hand, an ordinary swivel chair has a structure in which the height of the seat can be adjusted with respect to the legs by using a gas cylinder or the like so that it can be applied to various physiques of seated persons. Generally provided. However, it is common for the legs to have no footrest.

By the way, as a rotary chair for a special purpose such as drafter drafting, which requires an extremely high seat portion, there is a rotary chair having a footrest on its legs. For example, as shown in FIG. 8, a seat c is rotatably and height-adjustably attached to a support shaft b of a leg a, and a ring-shaped footrest d is horizontally placed at a predetermined height position of the support shaft b. It is a swivel chair for designers whose structure is fixed to.

However, the purpose of the footrest shown in the above-mentioned example is that the seat portion needs to be extremely raised according to the height of the drafter, so that the foot of the seated person floats from the floor. is there. Even if the footrest with this structure is applied to a swivel chair that is normally used, it does not become a swivel chair with a footrest that can be applied to all seated people of different physiques from adults to children.

That is, as shown in FIG. 9, the height of the desk top plate e is standardized to be substantially constant, for example, 70 cm, and when an adult having a normal physique is used (see FIG. 9 (a)). If the height of the seat c is adjusted to an optimum height H so that work on the desk top e can be performed easily, the feet are placed on the floor while sitting on the seat c. As a result, the knee is bent at about 90 degrees and becomes comfortable to sit on. On the other hand, when used by a small adult or a child in the upper grades of elementary school (see FIG. 9 (b)), the height of the seat c is set to H + ΔH,
The height h of the footrest d is set so that the foot is placed on the footrest d with the seat c seated and the knee bent at about 90 degrees.
It is possible to set and provide the above even in a swivel chair having a conventional structure. However, when used by children of lower grades of elementary school who have a smaller physique (see FIG. 9 (c)), it is necessary to set the height of the seat c to H + ΔH + ΔH ₁ , but the footrest d Since it is fixed, the feet are suspended in the air, and it is not comfortable to sit on. FIG. 9 (c) shows a footrest d'which is set to a virtually optimal height h + Δh ₁ . Here, ΔH: h = ΔH ₁ : Δh
It turns out that the person's physique changes in a substantially similar shape, and the sitting height and the below-knee length change in a substantially similar shape depending on the physique.
When a conventional swivel chair with a fixed foot rest is used, when the height of the seat is set according to the seat height so as to be suitable for office work, the distance between the seat and the foot rest is This is because the height changes and it is often not possible to adapt to the below-knee length.

[0007]

In view of the above-mentioned situation, the present invention is to solve the problem in the prior art in which the height of the seat portion can be adjusted in consideration of only the seat height of the seated person. Paying attention to the fact that the length under the knee changes in a similar manner depending on the physique of the seated person, and in the swivel chair in which the height of the seat can be adjusted with respect to the leg, the seat It is a point to provide a swivel chair with a footrest that can be used by adjusting the height of the footrest to suit the height of the seat when the height is adjusted.

[0008]

In order to solve the above-mentioned problems, the present invention is a swivel chair in which the height of the seat portion can be adjusted with respect to the leg portion. We constructed a swivel chair with a footrest that allows the height of the platform to be adjusted.

Here, it is not possible to adjust the height by interlocking the seat portion and the footrest with an elevating mechanism, and set the amount of change in elevation of the footrest to be a constant multiple of the amount of change in elevation of the seat. It is preferable that

More specifically, as the elevating mechanism, a supporting member is horizontally rotatably attached to the upper outer periphery of a support shaft erected on the leg portion, and the supporting shaft below the support member is horizontally rotatable. A footrest is attached so that it can be moved up and down, and one end of the connecting rod is pivotally supported on the support member so as to be vertically rotatable, and at the center of the footrest is erected in a long hole formed at the other end of the connecting rod. The upper end of the provided support piece is rotatably supported in the hole, and the lower end of the interlocking rod provided on the seat portion is rotatably supported in the elongated hole formed in the intermediate portion of the connecting rod. We constructed a swivel chair with a footrest using a different lifting mechanism.

[0011]

In the swivel chair with a footrest according to the present invention having the above-mentioned contents, the height of the seat portion is set according to the seat height so as to be suitable for the work on the desk, and the seat portion having the height is set. The height of the footrest is adjusted so that the distance between the footrest and the footrest is optimal, and the distance between the seat and the footrest is adapted to the knee length of the seated person.

Here, a person's physique changes in a substantially similar shape, and the sitting height and the length below the knee also change in a substantially similar shape. Therefore, the seat portion and the footrest are interlocked by an elevating mechanism to adjust the height. It is not possible and the height of the footrest is automatically adjusted by adjusting the height of the seat by setting the amount of elevation change of the footrest to be a constant multiple of the amount of elevation change of the seat. It can be adjusted optimally.

Further, a supporting member is attached to the upper outer periphery of a support shaft erected on the leg so as to be horizontally rotatable, and a footrest is attached to the support shaft below the supporting member so as to be horizontally rotatable and liftable. One end of the connecting rod is rotatably supported by the supporting member so as to be vertically rotatable, and the upper end of a support piece erected at the center of the footrest is movably moved in the hole in a long hole formed at the other end of the connecting rod. By using an elevating mechanism in which the lower end of the interlocking rod provided below the seat portion is pivotally supported in a long hole formed in the intermediate portion of the connecting rod so as to be freely movable in the hole, It is possible to adjust the height of the footrest by interlocking with the normal height adjustment operation of, and increase the amount of elevation change of the footrest by a constant multiple with respect to the amount of elevation change of the seat. By setting, it is in a state in which it is comfortable to sit for people of all physiques. Than it can be achieved. Further, since the foot rest also rotates through the lifting mechanism as the seat rotates, the foot is always placed at a fixed position on the foot rest even if the seat is rotated while seated.

[0014]

The present invention will be described in more detail with reference to the embodiments shown in the accompanying drawings. 1 and 2 show a typical embodiment of a swivel chair with a footrest according to the present invention, in which a leg portion 1 and a seat portion 2 are provided.
Is rotatably and height-adjustably mounted, and a footrest 3 is provided at an appropriate position of the leg 1 so as to be height-adjustable in association with the seat 2.

In the leg portion 1, casters 5, ... Are respectively provided at the tips of a plurality of radially extending support legs 4, ... And a support shaft 6 is erected at the center of the support legs 4 ,. The shaft 6 has a normal structure in which a gas cylinder 7 that is expandable and contractible and rotatable is partially installed so as to project upward. The gas cylinder 7 protruding from the support shaft 6 may be covered with an expandable bellows.

The seat portion 2 has a mounting body 9 for receiving the lower surface of the seat plate 8 rotatably or rotatably mounted on the upper end portion of the gas cylinder 7, and the backrest rod 1 is supported from the rear portions on both sides of the seat plate 8.
It has a normal structure in which 0 and 10 are erected and a backrest plate 11 is attached to the upper part thereof. In this embodiment, the seat plate 8 can move forward against the elastic biasing force,
Further, the backrest rod 10 can be tilted rearward against the elastic biasing force.

The footrest 3 has a circular ring rod 14 fixed by a plurality of support rods 13 radially extending from an outer peripheral portion of a cylindrical body 12 which is rotatably and vertically movable on the support shaft 6. It was done. Therefore, the footrest 3 is the ring rod 1
4 can be adjusted in height while maintaining a horizontal state, and can be rotated around a support shaft 6. In the present embodiment, the upper surface of the ring rod 14 serves as the foot rest portion 15.

An elevating mechanism 16 for adjusting the height of the footrest 3 is provided in association with the height adjusting operation of the seat 2. That is, the elevating mechanism 16 is provided with a support member 17 on the outer periphery of the upper portion of the support shaft 6 so as to be horizontally rotatable, and the support shaft 6 is located below the support member 17.
The cylindrical body 12 of the footrest 3 which is externally inserted is arranged, and one end of the long connecting rod 18 is then attached to the end of the projecting portion 19 of the supporting member 17 which is sufficiently laterally projected from the support shaft 6. It is pivotally supported by a pivot shaft 20 so as to be rotatable up and down, and a long hole 21 formed along the length direction at the other end of the connecting rod 18 is provided with a central portion of the footrest 3 such as the cylindrical body 12. A pin 23 protruding from an upper end of a support piece 22 erected in a fixed state from the side surface is pivotally supported by being movably engaged in a hole, and further fixed to an appropriate place of the seat portion 2, for example, the mounting body 9. A pin 25 projecting from the lower end of the interlocking rod 24 provided below is formed in an intermediate portion of the connecting rod 18, that is, a long hole 26 formed along the length direction between the pivot 20 and the long hole 21. It is constructed so that it can be moved inward and pivotally supported.

In this embodiment, the connecting rod 18, the support piece 22 and the interlocking rod 24 are provided on both sides of the supporting member 17, respectively. Further, as a structure for attaching the support member 17 to the support shaft 6 so as to be horizontally rotatable, an appropriate rotating mechanism is adopted, but in the illustrated example, an annular groove 27 is formed on the outer periphery of the upper part of the support shaft 6, In the state where the circular hole 28 provided in the support member 17 is externally inserted in the support shaft 6, a protrusion 29 protruding from the inner surface of the circular hole 28 is slidably engaged with the annular groove 27. Here, the protrusion 29 may be formed in an annular shape along the inner circumference of the circular hole 28, or the tip of a screw screwed from the outside of the support member 17 may be used instead. Further, as a structure in which the cylindrical body 12 can be horizontally rotated and raised and lowered with respect to the support shaft 6, a structure in which a slider is simply provided on the inner peripheral surface of the cylindrical body 12 or a structure in which a bearing is interposed is adopted.

However, when the height of the seat plate 8 of the seat portion 2 is adjusted by operating the gas cylinder 7, the interlocking rod 24 is vertically displaced parallel to the axis of the gas cylinder 7 as the gas cylinder 7 is moved up and down. By rotating the connecting rod 18 up and down, the support piece 22 is vertically displaced parallel to the axis of the gas cylinder 7,
Therefore, the footrest 3 is moved up and down in conjunction with the seat 2.

The operation of the elevating mechanism 16 will be described in more detail with reference to the mechanical diagram of FIG. First, it is assumed that the interlocking rod 24, the connecting rod 18, the support piece 22, and the footrest 3 are in the state of the thick line in the figure. Therefore, when the seat plate 8 is raised by ΔH by the gas cylinder 7, the connecting rod 18 is rotated upward by a predetermined angle and the pin 25 is moved to the position indicated by 25 '.
H is raised, and the pin 23 is further raised by Δh to the position indicated by 23 ', so that the footrest portion 15 of the footrest 3 is moved to 1
Ascends by Δh to the position indicated by 5 '. Where ΔH
The relationship between Δh and Δh is that the vertical line passing through the center of the pivot 20 and the center of the pin 25, that is, the distance from the center line of the interlocking rod 24 to L _1, and the vertical line passing through the center of the pin 23 from the center line, That is, when the distance to the center line of the support piece 22 is L ₂ , the triangles 20, 25, 25 'and the triangles 20, 23, ₂ '
Since 3'is a similar shape, the relationship of ΔH: L ₁ = Δh: L ₁ + L ₂ is established, and therefore Δh = (L ₁ + L ₂ ) / L ₁ · ΔH, and the amount of change in elevation of the footrest portion 15 is Δh is increased by a constant multiple of the up / down change amount ΔH of the seat plate 8, that is, by (L ₁ + L ₂ ) / L ₁ times. For example, if L ₁ = L ₂ , then Δh = 2Δ
It becomes H, and the foot rest 15 moves up and down twice as much as the seat plate 8.

The feature of the elevating mechanism 16 is that the seat 2 and the footrest 3 are interlocked so that the amount of elevation change of the footrest 3 is increased by a constant multiple with respect to the amount of elevation change of the seat 2. However, the mechanism is not limited to the mechanism shown in the above-described embodiment. For example, a linear rack is provided on the side surface of the gas cylinder 7, and a pinion that meshes with the rack is provided at the upper end of the support shaft 6. It is also possible to use a gear mechanism that amplifies the rotation of the pinion via another gear and drives the rack provided on the footrest 3.

Here, when an adult having a normal physique is used, the height of the seat plate 8 is adjusted by operating the gas cylinder 7 in the same manner as a normal swivel chair, and the person sits down on the seat plate 8. In this state, the feet are placed on the floor, and the knees are bent at about 90 degrees so that the sitting comfort is achieved. The realization of such a seated state is not the subject of the present invention.

Therefore, according to the swivel chair with a footrest of the present invention, when it is used by a small adult or a child in the upper grades of elementary school, as shown in FIG. Adjusting the height of the desk, the standardized height,
For example, the height H ₁ of the seat plate 8 is set so that the user can easily work on the top plate of a 70 cm high desk, and the knee of the seated person seated on the seat portion 2 is bent at about 90 degrees in that state. The distance h ₁ between the seat plate 8 and the foot rest 15 is initially set so that the foot rests on the foot rest 3 in a posture. As a matter of course, sitting on the swivel chair set to this height provides a comfortable sitting state.

When children of lower grades of elementary school who are smaller in size are used, the seat portion 2 is raised to adjust the height of the seat plate 8 from the floor as shown in FIG. ,
The height H of the seat plate 8 makes it easy to work on the tabletop of the desk.
_{When 2} (= H ₁ + ΔH) is set, the footrest 3 is raised in conjunction with the operation as described above, and the distance h ₂ (= h ₁ + ΔH−Δh) between the seat plate 8 and the footrest 15 is set. Is optimally set so as to fit the length below the knee, and the legs are placed on the footrest portion 15 without sitting in the air while sitting on the seat plate 8, and the knees are bent at about 90 degrees for comfortable sitting. Becomes

In general, the seat height changes in accordance with the difference in physique, so the optimum height of the seat plate 8 is adjusted based on the seat height. Therefore, when the physique is reduced, the optimum height of the seat plate 8 is increased from H ₁ to H ₂ , and the distance between the seat plate 8 and the footrest portion 15 corresponding to the length below the knee is narrowed from h ₁ to h _2. Become. In other words, it is necessary to make the height change amount of the footrest portion 15 larger than the height change amount of the seat plate 8 in order to set the seating comfort even for seated persons having different physiques. The footrest 3 of the present invention can be set exactly like this.

In another embodiment of the rotary chair with a footrest shown in FIG. 6, a small gas cylinder 31 is attached to a pair of attachment members 30 fixed to the upper and lower portions of the support shaft 6, and A structure in which a rod 32 protruding and retracting above the gas cylinder 31 is connected to an upper end of a hanging rod 33 which is erected from a proper position of a footrest portion 15 mounted on a support shaft 6 so as to be vertically movable by the same mechanism as described above. Is. In the present embodiment, the height of the seat portion 2 and the height of the footrest 3 can be adjusted independently.

Further, as another embodiment, in the swivel chair with a footrest shown in FIG. 7, the tubular body 12 of the footrest 3 is externally mounted on the spindle 6 so as to be able to move up and down as described above. An engaging groove 34 having a deep upper portion and a shallow lower portion is formed on a side surface of the cylindrical member 6, and a tip of an adjusting bolt 35 screwed from the outside of the cylindrical body 12 is butt-engaged with the engaging groove 34, and its engaging position The height of the footrest 3 can be adjusted by changing the height of the footrest 3.

Although not shown as another embodiment, a male screw portion is formed on the outer periphery of the support shaft 6 and a female screw portion is formed on the inner periphery of the cylindrical body 12 of the footrest 3 so that both screw portions are formed. It is also possible to adopt a structure in which the height can be adjusted by screwing and rotating the footrest 3.

[0030]

The swivel chair with a footrest according to the present invention as described above is a swivel chair having a height adjustable seat portion with respect to the leg portion, and the footrest provided at a proper position on the leg portion. The height of the base can be adjusted, so when used by seated people with different physiques from adults to children, the height of the seat should be set according to the seat height to suit the work at the desk, and at the same time, the seat and foot should be adjusted. It is possible to adapt the distance between the table and the pedestal to the length below the knees of the seated person, and thus realize a comfortable sitting state.

Further, it is not possible to adjust the height by interlocking the seat portion and the foot rest with an elevating mechanism, and set the up / down change amount of the foot rest by a constant multiple with respect to the up / down change amount of the seat portion. By adjusting the height of the seat, the height of the footrest can be automatically adjusted to the optimum level.

[Brief description of drawings]

FIG. 1 is an overall perspective view showing a typical embodiment of a swivel chair with a footrest according to the present invention.

FIG. 2 is an enlarged side view of an essential part, which is also shown in a partial cross section.

FIG. 3 is a mechanism diagram of the same main part.

FIG. 4 is a side view of a swivel chair showing an example of setting of a use state of the swivel chair with a footrest of the present invention.

FIG. 5 is a side view of the swivel chair showing a state in which the seat portion is raised from the state of FIG.

FIG. 6 is a side view showing another embodiment of the swivel chair with a footrest.

FIG. 7 is a side view showing, in a partial cross-section, still another embodiment of the swivel chair with a footrest.

FIG. 8 is an overall perspective view showing a conventional swivel chair.

FIG. 9 is a simplified side view for explanation showing a state in which the heights of the seat portion and the footrest are adjusted according to the physique of the seated person.

[Explanation of symbols]

 1 leg part 2 seat part 3 foot rest 4 support leg 5 caster 6 support shaft 7 gas cylinder 8 seat plate 9 mounting body 10 backrest rod 11 backrest plate 12 cylinder body 13 support rod 14 ring rod 15 footrest portion 16 lifting mechanism 17 Supporting member 18 Connecting rod 19 Protrusion 20 Pivot 21 Long hole 22 Bearing piece 23 Pin 24 Interlocking rod 25 Pin 26 Long hole 27 Annular groove 28 Circular hole 29 Projection 30 Mounting member 31 Gas cylinder 32 Rod 33 Suspension rod 34 Dowel 35 adjustment bolt

Claims (3)

[Claims] 1. A swivel chair having a height adjustable seat portion with respect to the leg portion, wherein a foot rest provided at an appropriate position of the leg portion is height adjustable. Swivel chair with table. 2. The height can be adjusted by interlocking the seat portion and the footrest with an elevating mechanism, and the elevation change amount of the footrest is set to be a constant multiple of the elevation change amount of the seat portion. A swivel chair with a footrest according to claim 1. 3. As the elevating mechanism, a supporting member is attached to the upper outer periphery of a support shaft erected on the leg so as to be horizontally rotatable, and a support shaft below the supporting member is horizontally rotatable and can be raised and lowered. A mounting piece is attached, and one end of the connecting rod is pivotally supported on the supporting member so as to be vertically rotatable, and a supporting piece erected at a central portion of the footrest is provided in a long hole formed at the other end of the connecting rod. An elevating mechanism in which the upper end of the movable rod is pivotally supported in the hole, and the lower end of the interlocking rod provided on the seat portion is pivotally supported in the long hole formed in the intermediate portion of the connecting rod so as to be movable in the hole. The swivel chair with a footrest according to claim 2, which is used.