JP2842116B2 - Swivel chair with footrest - Google Patents

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 that can be applied to occupants of different sizes from adults to children.

[0002]

2. Description of the Related Art Conventional schoolchild chairs have a structure in which the height of a seat can be adjusted with respect to a leg and a height of a footrest plate attached to the leg can be adjusted. , But this kind of schoolchild chair has a non-rotating seat.

On the other hand, a typical swivel chair has a structure in which the height of a seat can be adjusted with respect to a leg using a gas cylinder or the like so as to be applicable to various physiques of a seated person. Generally provided. However, the legs usually do not have a footrest.

[0004] By the way, there is a swivel chair for a special purpose such as drafter drafting which requires the seat portion to be set extremely high, and has a structure in which a footrest is provided on a leg portion. For example, as shown in FIG. 8, a seat c is rotatably attached to a support shaft b of a leg a so as to be adjustable in height, and a ring-shaped footrest d is horizontally placed at a predetermined height position of the support shaft b. This is a swivel chair designed for designers with a fixed structure.

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

That is, as shown in FIG. 9, the height of the tabletop e is standardized to be substantially constant, for example, 70 cm, and when used by an adult having a normal physique (FIG. 9A) When the height of the seat c is adjusted to the optimal height H so that the work on the tabletop e can be performed easily, the foot is placed on the floor while sitting on the seat c. As a result, the knee is bent at about 90 degrees, and the seat is in a comfortable state. On the other hand, when an adult with a small physique or a child of about the upper grade of elementary school is used (see FIG. 9B), the height of the seat c is set to H + ΔH,
The height h of the footrest d is such that the foot is placed on the footrest d with the knees folded at about 90 degrees while sitting on the seat c.
Can be set and provided in a swivel chair having a conventional structure. However, (see FIG. 9 (c)) in the case where the smaller elementary school lower grades about children below the physique use, it is necessary to set the height of the seat c to H + ΔH + ΔH _1, stand d foot Because it is fixed, the feet float in the air, and the seat is not comfortable. Describes a footrest d 'set to virtually optimum height h + Delta] h ₁ in FIG. 9 (c). Here, ΔH: h = ΔH ₁ : Δh
It turns out that the physique of a person changes in a substantially similar shape, and the sitting height and the length under the knee change in a substantially similar shape according to the physique,
If the conventional footrest is a fixed swivel chair, if the height of the seat is set according to the sitting height so as to be suitable for work on the desk, the interval between the seat and the footrest will also be This is because it is often not possible to adapt to the length below the knee because the height is changed by the height adjustment.

[0007]

SUMMARY OF THE INVENTION In view of the above situation, the present invention seeks to solve the problem that the height of the seat can be adjusted in consideration of only the sitting height of the occupant. Focusing on the fact that the length below the knee changes in a similar manner according to the physique of the seated person, and in a swivel chair with the height of the seat adjustable relative to the legs, the height of the seat is adjusted according to the physique of the seated person. It is an object of the present invention to provide a swivel chair with a footrest that can be used by adjusting the height of the footrest so as to be suitable for the height of the seat when the height is adjusted.

[0008]

Means for Solving the Problems The present invention is, for the aforementioned problem solution, a rotating chair without the adjustable seat height with respect to the leg, in place of the seat and the leg Footrests provided
The height can be adjusted by linking the
Multiplied by the amount of change in height of the footrest to the amount of change in height of the part
A swivel chair with a footrest that was set as large as possible was constructed.

[0009]

More specifically, as the elevating mechanism, a support member is horizontally rotatably mounted on an upper outer periphery of a support shaft erected on the leg portion, and is horizontally rotatable on a support shaft below the support member. A footrest is mounted so as to be able to move up and down, and one end of the connecting rod is pivotally supported by the supporting member so as to be vertically rotatable, and a standing hole is formed at the center of the footrest in an elongated hole formed at the other end of the connecting rod. The upper end of the provided support piece is pivotally supported so as to be freely movable in the hole, and the lower end of the interlocking rod provided below the seat is pivotally supported so as to be freely movable in the hole in the elongated hole formed in the intermediate portion of the connecting rod. A swivel chair with a footrest using a lifting mechanism was constructed.

[0011]

According to the swivel chair with a footrest of the present invention having the above-mentioned contents, the height of the seat is set in accordance with the seat height so as to be suitable for work on a desk, and the seat having the set height is provided. 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, since the physique of the person changes in a substantially similar manner, and the height of the seat and the length under the knee also change in a substantially similar manner, the height of the seat is adjusted by linking the seat and the footrest with an elevating mechanism. The height of the footrest is automatically adjusted by adjusting the height of the seat by setting the height of the footrest to be a constant multiple of the height of the footrest with respect to the elevation change of the seat. It can be adjusted optimally.

[0013] Further, a support member is horizontally rotatably mounted on an upper outer periphery of a support shaft erected on the leg, and a footrest is mounted on a support shaft below the support member so as to be horizontally rotatable and liftable. One end of the connecting rod is pivotally supported on the support member so as to be vertically rotatable, and the upper end of a support piece erected at the center of the footrest is moved in the long hole formed at the other end of the connecting rod in the hole. By using an elevating mechanism that pivotally supports the lower end of the interlocking rod provided on the seat and further rotatably supports the lower end of the interlocking rod in an intermediate hole of the connecting rod so that the lower end of the interlocking rod can freely move in the hole. It is possible to adjust the height of the footrest in conjunction with the normal height adjustment operation of the above, and to further increase the elevation change of the footrest by a constant multiple with respect to the elevation change of the seat. By setting, it is a comfortable state for occupants of any physique Than it can be achieved. In addition, since the footrest also rotates via the elevating mechanism with the rotation of the seat, even when the seat is rotated in a seated state, the foot is always placed at a fixed position on the footrest.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention; 1 and 2 show a typical embodiment of a swivel chair with a footrest according to the present invention, in which a leg 1 has a seat 2.
Is mounted so as to be rotatable and adjustable in height, and a footrest 3 is provided at an appropriate position on the leg 1 so as to be adjustable in height in conjunction with the seat 2.

The leg 1 is provided with casters 5,... At the distal ends of a plurality of radially extending supports 4, and a support shaft 6 is provided upright at the center of the supports 4,. The shaft 6 has a normal structure in which a gas cylinder 7 that is extendable and rotatable and is rotatable is partially installed so as to protrude upward. The gas cylinder 7 protruding from the support shaft 6 may be covered with a bellows which can be extended and contracted.

The seat 2 is mounted on the upper end of the gas cylinder 7 with a mounting member 9 for receiving the lower surface of the seat plate 8 so as to be non-rotatable or rotatable.
It has a normal structure in which 0, 10 are erected, and a backrest plate 11 is mounted on the top. In this embodiment, the seat plate 8 can move forward against the elastic urging force,
The backrest rod 10 can be tilted rearward against the elastic urging force.

A circular ring rod 14 is fixed to the footrest 3 with a plurality of rods 13 extending radially from the outer periphery of a cylindrical body 12 which is rotatably and vertically lifted outside the spindle 6. It was done. Therefore, the footrest 3 is the ring rod 1
The height 4 can be adjusted while maintaining the horizontal state, and can be rotated around the support shaft 6. In this embodiment, the upper surface of the ring rod 14 serves as a footrest 15.

An elevation mechanism 16 for adjusting the height of the footrest 3 in conjunction with the height adjustment operation of the seat 2 is provided. That is, the elevating mechanism 16 provides a support member 17 so as to be horizontally rotatable around the upper periphery of the support shaft 6, and the support shaft 6 is positioned below the support member 17.
The cylindrical body 12 of the footrest 3 is extrapolated from above, and one end of the long connecting rod 18 is attached to the end of the protruding portion 19 of the supporting member 17 which projects sufficiently laterally from the support shaft 6. The connecting rod 18 is pivotally supported so as to be able to rotate up and down, and the other end of the connecting rod 18 is formed along the longitudinal direction of the connecting rod 18 in the center of the footrest 3, for example, 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 is movably engaged in the hole to pivotally support the pin 23, and further fixed to a proper place of the seat portion 2, for example, to the mounting body 9. A pin 25 projecting from the lower end of the lower interlocking rod 24 is inserted into an intermediate portion of the connecting rod 18, that is, an elongated hole 26 formed between the pivot 20 and the elongated hole 21 along the length direction thereof. It is constructed so as to be pivotally supported by being movably engaged inside.

In this embodiment, the connecting rod 18, the supporting piece 22 and the interlocking rod 24 are provided on both sides of the support member 17, respectively. As a structure for attaching the support member 17 to the support shaft 6 so as to be freely rotatable in the horizontal direction, an appropriate rotation mechanism is adopted, but in the illustrated example, an annular groove 27 is formed on the upper outer periphery of the support shaft 6, and In the state in which the circular hole 28 provided in the support member 17 is externally inserted into the support shaft 6, a protrusion 29 provided on 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 periphery of the circular hole 28, or may be replaced with a tip of a screw screwed from outside the support member 17. In addition, as a structure that allows the cylindrical body 12 to freely rotate and move up and down 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 employed.

When the height of the seat plate 8 of the seat 2 is adjusted by operating the gas cylinder 7, the interlocking rod 24 moves up and down in parallel with the axis of the gas cylinder 7 as it moves up and down. By rotating the connecting rod 18 up and down, the bearing piece 22 is vertically moved parallel to the axis of the gas cylinder 7,
The footrest 3 is moved up and down in conjunction with the seat 2.

The operation of the lifting mechanism 16 will be described in more detail with reference to the mechanism 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. Then, 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 a position indicated by 25 ′ by ΔH.
H, and the pin 23 further rises by Δh to the position indicated by 23 ′, so that the foot rest 15 of the foot rest 3
It rises by Δh to the position indicated by 5 ′. Where ΔH
Relationship between Δh is the vertical line passing through the center of the pin 25 from the center of the pivot 20, i.e. the distance to the center line of the associated rod 24 and L _1, a vertical line passing through the center of the pin 23 from the centerline, that is, the distance to the center line of the bearing piece 22 and L _2, a triangle and the triangle 20,25,25 '20,23,2
Since 3 ′ is a similar shape, the relationship of ΔH: L ₁ = Δh: L ₁ + L ₂ holds, and therefore Δh = (L ₁ + L ₂ ) / L ₁ .ΔH. Δh is increased by a constant multiple of the elevation change ΔH of the seat plate 8, that is, (L ₁ + L ₂ ) / L ₁ times. For example, if L ₁ = L ₂ , Δh = 2Δ
H, the foot rest 15 moves up and down twice as much as the seat plate 8.

The lifting mechanism 16 is characterized in that the seat 2 and the footrest 3 are linked so that the amount of change in the height of the footrest 3 is larger than the amount of change in the height of the seat 2 by a constant multiple. However, the present invention 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 a rack provided on the footrest 3.

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

According to the swivel chair with a footrest of the present invention, as shown in FIG. 4, when a small-sized adult or a child of an elementary school age is used, as shown in FIG. Adjust the height of the desk, height standardized desk,
For example office on in the top plate height 70cm the desk set the height H ₁ of the seat plate 8 to allow comfortably, knees of a seated person seated on the seat 2 in this state is folded about 90 degrees its foot posture initializes the distance h ₁ of the seat plate 8 and the footrest 15 to be placed on the rests 3 feet. Naturally, when the user sits on the swivel chair set at this height, a comfortable state is achieved.

In the case where a child who is smaller in elementary school age and lower in grade is used, the seat 2 is raised to adjust the height of the seat plate 8 from the floor as shown in FIG. ,
Height H of the seat plate 8 so that work on the desk top can be performed easily.
_{When 2} (= H ₁ + ΔH) is set, the footrest 3 rises in conjunction with the movement as described above, and the interval h ₂ between the seat plate 8 and the footrest 15 (= h ₁ + ΔH−Δh). Is optimally set to conform to the length below the knee, the foot is placed on the footrest 15 without sitting in the air while sitting on the seat plate 8, and the knee is bent at about 90 degrees to provide a comfortable sitting state. Becomes

In general, if the physique is different, the sitting height changes accordingly. Therefore, the optimum height of the seat plate 8 is adjusted based on the sitting height. Accordingly, the height of the optimum seat plate 8 when the physique is smaller becomes higher from H ₁ and H _2, the interval between the seat plate 8 and the footrest 15 which corresponds approximately to the knee length narrows from h ₁ and h ₂ Become. In other words, it means that the height change amount of the footrest 15 needs to be larger than the height change amount of the seat plate 8 in order to make the seating comfort even for occupants of different physiques. The setting of the footrest 3 of the present invention is exactly possible.

In a swivel chair with a footrest shown in FIG. 6 as another embodiment, a small gas cylinder 31 is mounted on a pair of mounting members 30 fixed to the upper and lower portions of the support shaft 6, and The upper end of a suspension rod 33 erected from an appropriate position of a footrest 15 attached to the support shaft 6 so as to be able to move up and down by the same mechanism as described above, is connected to a rod 32 that protrudes and retracts above the gas cylinder 31. It is. In the present embodiment, the height of the seat 2 and the height of the footrest 3 can be adjusted independently.

Further, as another embodiment, the rotary chair with a footrest shown in FIG. 7 has the cylindrical body 12 of the footrest 3 mounted on the support shaft 6 so as to be able to move up and down as described above, and the support shaft. 6 is formed with an engagement groove 34 having a deep upper portion and a shallower lower portion, and the tip of an adjustment bolt 35 screwed from the outside of the cylindrical body 12 abuts and engages with the engagement groove 34. The height of the footrest 3 can be adjusted by changing the height up and down.

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, and both screw portions are formed. A structure in which the height can be adjusted by screwing and rotating the footrest 3 is also possible.

[0030]

As described above, the swivel chair with a footrest according to the present invention is a swivel chair in which the height of the seat can be adjusted with respect to the leg, and is provided at an appropriate position between the seat and the leg. With a footrest
The height can be adjusted by interlocking with the lifting mechanism and the seat
The amount of change in height of the footrest is a constant multiple of the amount of change in height
When seated people of different physiques from adults to children use it, set the height of the seat according to the sitting height so that it is suitable for work on the desk, and at the same time, set the seat and footrest. Can be adapted to the length below the knees of the seated person, and a comfortable sitting state can be realized. In particular, the seat and the footrest are linked by the lifting mechanism.
The height can be adjusted and the amount of elevation change of the seat
The amount of elevation change of the footrest is set to be larger by a constant multiple
Automatically adjusts the height of the seat
The height of the platform can be adjusted optimally.

[0031]

[Brief description of the 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 a main part similarly shown in a partial cross section.

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

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

FIG. 5 is a side view of the swivel chair showing a state where the seat is raised from the state of FIG. 4;

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

FIG. 7 is a side view, partially in section, of yet another embodiment of a 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 how to adjust the height of a seat and a footrest according to the physique of a seated person.

[Explanation of symbols]

 Reference Signs List 1 leg 2 seat 3 footrest 4 support 5 caster 6 support shaft 7 gas cylinder 8 seat plate 9 mounting body 10 backrest rod 11 backrest plate 12 cylindrical body 13 support rod 14 ring rod 15 footrest part 16 lifting mechanism REFERENCE SIGNS LIST 17 support member 18 connecting rod 19 protrusion 20 pivot 21 long hole 22 support piece 23 pin 24 interlocking rod 25 pin 26 long hole 27 annular groove 28 circular hole 29 protrusion 30 mounting member 31 gas cylinder 32 rod 33 suspension rod 34 Groove 35 Adjustment Bolt

Claims (2)

(57) [Claims] 1. A swivel chair in which a height of a seat portion can be adjusted with respect to a leg portion, and a footrest provided at an appropriate position between the seat portion and the leg portion.
The height can be adjusted by linking the table with the lifting mechanism and
The amount of change in elevation of the footrest is constant with respect to the amount of elevation change in the seat.
A swivel chair with a footrest characterized by being set twice as large . 2. As the lifting mechanism, a support member is mounted on the upper periphery of a support shaft erected on the leg portion so as to be horizontally rotatable, and a foot is provided on a support shaft below the support member so as to be rotatable and liftable. A mounting piece is mounted, and one end of a connecting rod is pivotally supported on the supporting member so as to be vertically rotatable, and a support piece is provided in a long hole formed in the other end of the connecting rod, and is provided upright at the center of the foot mounting base. A lifting mechanism that pivotally supports the upper end of the connecting rod so as to be freely movable in the hole, and further pivotally supports the lower end of the interlocking rod provided on the seat portion to be freely movable in the hole in a long hole formed in an intermediate portion of the connecting rod. claim 1, wherein the footrest with swivel chair using.