JP2003310380A - Elevatable legless chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an elevatable legless chair that can adjust precisely the position of a seat at a desired height and is superior in strength and durability, and is compact and low in cost. <P>SOLUTION: The legless chair comprises a pair of an upper and lower rocking arms 21 parallel to each other that are axially fitted to a base 11 and made capable of rising and falling by their upward and downward rocking movement, a seat 31 that is axially fitted relatively rotatably to the rocking arms on the opposite end sides of the base side fitting ends of the rocking arms, a rotating member 41 that is rotatably fitted by a rotating center axle parallel with a fitting axle to the base and a seat fitting axle between the fitting position to the base 11 and the seat fitting positions of the rocking arms, a screw hole 45 formed on the rotating member at right angle with the rotating center axle of the rotating member 41, a shaft with a screw 51 on outer circumference of which the screw for screwing to the screw hole of the rotating member is formed, and a drive device of the shaft with the screw that has a forward-and-reverse rotation drive part of the shaft with the screw and is fitted to the base 11 upward and downward rockably. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting seat chair.

[0002]

2. Description of the Related Art Conventionally, as an elevating type seat chair in which the height of a seat portion can be freely adjusted, a swing support leg provided on a base so as to be capable of undulating, and a swing support leg supported by the swing support leg can be raised and lowered. Seated surface, an engaging portion that slidably engages with the swing support leg, a swing arm that swings the engagement portion to raise and lower the swing support leg, and the swing arm There is proposed a reduction gear portion having a shaft attached thereto and an electric motor with a reduction gear that rotates the reduction gear portion (Japanese Patent Laid-Open No. 9-23876).
9).

In the elevator chair, the reduction gear portion is rotated by the rotation of the electric motor with the reduction gear, and the swing arm pivotally supported by the reduction gear portion is swung to raise and lower the swing support leg. Then, when the seat surface reaches the desired position, the rotation of the electric motor with reduction gear is stopped to fix the position of the seat surface.

[0004]

However, in the conventional elevator chair as described above, the load on the seat surface is applied in the direction of pushing down the swing arm via the swing support leg. Therefore, an excessive rotational moment is applied to the swing arm, with the engaging portion of the swing support leg acting as a point of action and the reduction gear unit as a fulcrum of the pivotal support portion. Therefore, the swing arm and the reduction gear unit are applied. Unless the strength is high, the swing arm may swing downward, causing the swing support leg to swing downward and the seat surface to descend. Therefore, due to the increased strength of the parts, the whole becomes heavy and the size becomes large, and the parts tend to be expensive.

The present invention has been made in view of the above points, and can accurately adjust the position of the seat portion to a desired height, is excellent in strength and durability, and is compact and inexpensive. It is intended to provide a lifting chair.

[0006]

According to a first aspect of the present invention, there is provided a base body, a swing arm pivotally mounted on the base body so as to be capable of undulating by vertical swing, and the swing arm attached to the swing arm. A seat portion that moves up and down by vertical swinging of the moving arm, and a swing center axis parallel to the shaft mounting axis of the base body between the seating position and the seat portion of the swing arm on the base body. Attached rotating member, a screw hole formed in the rotating member at a right angle to the rotating center axis, and a screw having a screw formed on the outer periphery and screwed into the screw hole of the rotating member. A lifting seat chair, comprising: a shaft; and a screw shaft drive device that is vertically swingably attached to the base body and includes a drive unit for rotating the screw shaft forward and backward.

According to a second aspect of the present invention, in the first aspect, the rotation of the threaded shaft by the threaded shaft driving device causes the rotating member screwed with the threaded shaft to move forward or backward, thereby causing the rotation. When the swing arm moves up and down as the member moves forward and backward, the seat part moves up and down, and the rotating member rotates, so that the threaded shaft and the threaded shaft drive device are screwed into the rotating member. Is oscillated up and down.

According to a third aspect of the present invention, in the first or second aspect, two sets of swing arms are provided in parallel with each other in the width direction of the seat portion, and a turning member is provided between the two sets of swing arms. It is characterized by being provided.

According to a fourth aspect of the present invention, in the third aspect, the set of swing arms is composed of two swing arms which are an upper swing arm and a lower swing arm and which are parallel to each other.
The upper swing arm and the lower swing arm have seat portions axially attached to the base body at positions where the distances from the shaft attachment axis are equal to each other.
The seat pivot shaft of the upper swing arm and the seat pivot shaft of the lower swing arm are parallel to each other.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, a swing limit position detecting means for detecting an upper swing limit position and a lower swing limit position of the swing arm is provided. It is characterized by being

[0011]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail below with reference to the accompanying drawings. 1 is a side view of an elevating seat chair according to an embodiment of the present invention, FIG. 2 is a plan view of an elevating seat chair according to the embodiment, FIG. 3 is a sectional view taken along line 3-3 of FIG. 4 is a cross-sectional view showing a raised state of the seat portion in the same embodiment, FIG. 5 is a partial perspective view showing the vicinity of a base shaft attachment portion of a pair of upper and lower swing arms in the same embodiment, and FIG. 6 is the same embodiment. 3 is a partial perspective view showing the vicinity of the shaft drive device with a screw in FIG.

An elevation type seat chair 10 according to an embodiment of the present invention shown in the drawings includes a base body 11, a swing arm 21, a seat portion 31,
It has a rotating member 41, a screw hole 45, a shaft 51 with a screw, and a shaft driving device 61 with a screw.

The base body 11 serves as a stand for supporting the respective parts of the lift-type seat chair 10, and in this example, it is formed of a plate having a rectangular shape in plan view. The base body 11 has a size such that the lift-type seat chair 10 does not fall when seated on the seat portion 31. On the upper surface of the base 11, a swing support 12 is provided upright.
The swing support portion 12 of this example is composed of two support plates 12a and 12a which are parallel to each other.
The distance between them is the required distance.

The oscillating arm 21 is composed of an upper oscillating arm 22 and a lower oscillating arm 23, and is a pair of upper and lower parts which are parallel to each other. The base body 1 is pivotally mounted so that it can be vertically swung.
It can be undulated on 1. In this example, two sets of the swing arms 21 are provided in parallel with each other in a width direction W of a seat portion 31 described later with a required gap therebetween, and the two sets of the link members 2 are provided.
The reference numerals 1 and 21 are pivotally attached to the inside of the support plates 12a and 12a by pivoting shafts 71 and 72 to the base body 11 so as to be vertically swingable. The shaft attachment axis 71 of the upper swing arm 22 to the base body 11 and the shaft attachment axis 72 of the lower swing arm 23 to the base body 11 are parallel to each other and deviated from the vertical direction V of the base body 11. It is arranged diagonally.

The seat portion 31 has a required size, and the upper surface thereof constitutes the seat surface 31a. The seat portion 31 of this example has a plate shape of a rectangular shape in a plan view in which a direction along the short side 11a of the substrate 11 is a width direction W, and a block-shaped swing arm holding portion 32 is projectingly formed on a lower surface thereof. There is. On both side surfaces of the swing arm holding portion 32 in the width direction (equal to the width direction W of the seat portion 31), end sides 22b of the swing arm 21 opposite to the base body shaft attachment end sides 22a, 23a, 23b is rotatably supported by seat portion shaft mounting shafts 73 and 74, whereby the seat portion 31 is rotatably mounted relative to the swing arm 21. Further, the seat portion shaft mounting shafts 73 and 74 have a distance from the shaft mounting shafts 71 and 72 to the base body in the upper swing arm 22 and the lower swing arm 23 of the swing arm 21, respectively.
The upper swing arm 22 and the lower swing arm 23 are made equal to each other, whereby the swing arm 21, the base body 11 and the seat portion 31 form a parallel four-bar rotation link, and the seat portion 31 swings. The angle does not change when the moving arm 21 swings up and down. In addition, in this example, the seat portion 31 is horizontal with respect to the base body 11, and
It is pivoted to 1.

Further, the seat portion shaft mounting shaft 73 of the upper swing arm 22 and the seat portion shaft mounting shaft 74 of the lower swing arm are:
They are parallel to each other and arranged in an oblique direction deviating from the vertical direction V of the base body 11 and inserted into the swing arm holding portion 32 of the seat portion 31.

The rotating member 41 is located at a position where the swing arm 21 is attached to the base (that is, the shaft 7 is attached to the base 7).
1, 72) and the seat portion shaft mounting position (that is, the seat portion shaft mounting shafts 73 and 74), the shaft mounting shafts 71 and 72 to the base body.
Also, it is rotatably attached by a rotation center shaft 42 that is parallel to the seat portion shaft attachment shafts 73 and 74. As better understood from FIGS. 5 and 6, the rotating member 41 of this example is
The pair of swing arms 21, 2 has a shape in which the short column is made horizontal and the rotation center shaft 42 is formed projectingly on both horizontal end faces.
It is provided between the two through the mounting member 27. The attachment member 27 is a plate-like member that is fixed upward to the lower swing arm 22 in each of the two sets of link members 21 and 21, and has a rotation member holding hole formed in the upper portion of the attachment member 27. The rotation center shaft 42 of the rotation member 41 is inserted into the shaft 28. Further, in this embodiment, the upper end of the mounting member 27 protrudes above the upper swing arm 22, and the turning member holding hole 28 is formed in the upper swing arm 22.
Position of the shaft on the base (that is, the shaft 7
It is located above 1).

The rotating member 41 includes the rotating center shaft 4
2, a screw hole 45 is formed so as to penetrate at a right angle. The screw hole 45 is formed so as to be located above a position where the upper swing arm 22 is axially attached to the base body.

As can be better understood from FIGS. 5 and 6, the threaded shaft 51 has a screw 52 engraved on its outer periphery, and the screw 52 allows the screw hole 4 of the rotating member 41 to be screwed.
It is screwed with 5. The threaded shaft 51 can be normally and reversely rotated by a threaded shaft drive device 61 along the outer peripheral direction of the threaded shaft.

The threaded shaft driving device 61 is provided with a threaded shaft forward / reverse rotation drive unit (which is composed of an electric motor or the like, not shown) connected to the threaded shaft 51 therein, and is provided on the base 11. It is attached to the rocking support 12 so as to be vertically rockable. In this example, a swing center shaft 62 is formed on both outer sides of the threaded shaft drive device 61, and the swing center shaft 62 is formed in the threaded shaft drive device holding hole 15 formed in the swing support portion 12. Is inserted into the screw shaft drive device 61.
Also, the shaft 51 with a screw is vertically swingable. The threaded shaft drive device 61 is connected to an operation unit (not shown), and operation of the operation unit is started, operation is stopped, and normal rotation and reverse rotation of the threaded shaft 51 are switched. ing.

The shaft drive device 61 with a screw is also used.
The position of the swing center shaft 62 is such that the center line 53 of the threaded shaft 51 screwed with the rotating member 41 is the position where the upper swing arm 22 is attached to the base body, that is, the axis to the base body. It is arranged so as to be located above the shaft 71.

Further, on the base 11, an upper limit detecting means 82 for detecting an upper limit position (in this example, a substantially vertical state) when the swing arm 21 vertically swings, and a lower limit position (in this example, a substantially horizontal state). Lower limit detection means 83 for detecting (state)
The rocking limit position detecting means 81 is provided, and the operation of the screw shaft drive device 61 is stopped at the rocking limit position. Upper limit detection means 82 of this example
As the lower limit detection means 83, a limit switch is used which operates by contacting the swing arm 21 when the swing arm 21 is at the upper limit or the lower limit. The upper swing arm 22 is provided with a protrusion 26 that comes into contact with the upper limit detection means 82 when the upper limit swings. The swing limit position detecting means 81
May be configured by other detecting means, for example, a photo sensor or the like.

The operation of the lift-type chair 10 having the above structure will be described below. First, when the seat portion 31 is raised from the lower position, the threaded shaft drive device 61 rotates the threaded shaft 51 in one direction. In this case, the rotation direction of the threaded shaft 51 is set such that the rotating member 41 screwed with the threaded shaft 51 retracts on the threaded shaft 51 toward the threaded shaft drive device 61. It When the rotating member 41 is retracted, as shown by the chain double-dashed line in FIG. 1 or as shown in FIG.
Is pulled toward the side of the shaft drive device 61 with a screw and swings upward with the shafts 71 and 72 attached to the base body as fulcrums. At that time, the center line 53 of the threaded shaft 51 screwed into the rotating member 41 as described above is located at a position where the upper swing arm 22 is attached to the base body, that is, from the shaft attachment shaft 71 to the base body. Since the screw shaft 51 and the swing arm 21 are not aligned with each other, the swing arm 21 can be pulled upward to swing. Moreover, since the threaded shaft driving device 61 and the threaded shaft 51 swing upward in response to the upward swing of the swing arm 21, the upward swing of the swing arm 21 is not hindered. .

Further, since the swing arm 21 constitutes a parallel four-bar linkage mechanism with the base 11 and the seat portion 31,
The seat portion 31 can be raised in the same state as in the beginning, for example, in a horizontal state. Further, the seat portion 31 is the seat portion 31.
Since it is supported by the two sets of swing arms 21 and 21 separated in the width W direction, the load can be sufficiently supported.
In addition, a seat portion shaft mounting shaft 73 of the upper swing arm 22,
Since the seat part shaft mounting shaft 74 of the lower swing arm 23 is arranged in an oblique direction deviating from the vertical direction V of the base body 11, the seat part shaft mounting shaft 73 of the upper swing arm 22 is arranged. The seat shaft 74 of the lower swing arm 23 is not vertically aligned with the base 11, and the upper swing arm 22 and the lower swing arm 23 support the seat 31 efficiently. Therefore, it is possible to prevent the seat portion 31 from tilting under load.

If the rotation of the threaded shaft 51 by the threaded shaft driving device 61 is stopped when the height of the seat 31 reaches a desired height, the seat 31 is stopped.
Rises and the seat portion 31 is held at the stop position. At that time, a force to swing the swing arm 21 downward is exerted by the load on the seat portion 31, but the rotating member 41 screwed with the threaded shaft 51 does not move downward. Since it does not rotate, the swing arm 21 does not swing downward, and the height position of the seat portion 31 is reliably maintained.

When the seat portion 31 is further raised to reach the upper limit position, the upper limit detection means 82 of the swing limit position detection means 81 is activated to stop the operation of the screw shaft drive device 61. , The rise of the seat portion 31 is stopped.

Next, when lowering the seat portion 31, the threaded shaft drive device 61 rotates the threaded shaft 51 in the opposite direction to rotate the threaded shaft 51. The member 41 is moved forward, the swing arm 21 is swung downward, and the seat portion 31 is lowered. At this time, the screw shaft drive device 61 and the screw shaft 51 also swing downward as the swing arm 21 swings downward.
1 does not hinder downward swinging. And the seat 3
When 1 is in a desired position, the rotation of the threaded shaft 51 by the threaded shaft driving device 61 is stopped, and the rising of the seat portion 31 is stopped, and the seat portion 31 is held at the stop position. Also in this case, the threaded shaft 5
Since the rotating member 41 screwed with 1 does not rotate due to the load applied to the seat portion 31, the swing arm 21 does not swing downward, and the height of the seat portion 31 is ensured. Position is maintained.

When the seat 31 is further lowered to reach the lower limit position, the lower limit detection means 83 of the swing limit position detection means 81 is activated to stop the operation of the screw shaft drive device 61. Then, the lowering of the seat portion 31 is stopped.

In the above embodiment, the center line of the threaded shaft is above the position where the upper swing arm is attached to the base body. It may be located below the position where the side swing arm is attached to the base body. A backrest may be provided on the seat.

[0030]

As shown and described above, according to the lifting type seat chair of the present invention, the screw shaft and the rotating member are screwed together, and the screw shaft is rotated by forward or reverse rotation. As the seat is lifted up and down by moving the swinging arm up and down by moving the member forward and backward, the seat can be accurately adjusted to the desired height, and the strength and durability are excellent. Furthermore, since it is not necessary to excessively increase the strength of the component, it can be made compact and inexpensive.

[Brief description of drawings]

FIG. 1 is a side view of an up-and-down seat chair according to an embodiment of the present invention.

FIG. 2 is a plan view of a lift-type sitting chair according to the embodiment.

3 is a sectional view taken along line 3-3 of FIG.

FIG. 4 is a cross-sectional view showing a raised state of a seat portion in the embodiment.

FIG. 5 is a partial perspective view showing the vicinity of a base body shaft attachment portion of a pair of upper and lower swing arms in the same embodiment.

FIG. 6 is a partial perspective view showing the vicinity of the shaft drive device with a screw in the embodiment.

[Explanation of symbols]

10 Lifting chair 11 Base 21 Swing arm 22 Upper swing arm 23 Lower swing arm 31 seat 41 Rotating member 42 Rotation center axis 45 screw holes 51 threaded shaft 61 Screw shaft drive 71,72 Axial attachment to base body 73, 74 Seat axis 81 Swing limit position detection means

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tetsukichi Arakawa             2-13-4 South Meieki, Nakamura-ku, Nagoya-shi, Aichi             Inoac Corporation F-term (reference) 3B091 CA01 CA11 NA00

Claims (5)

[Claims] 1. A base body, a swing arm pivotally attached to the base body so as to be able to rise and fall by vertical swing, and a seat portion attached to the swing arm and moved up and down by vertical swing of the swing arm. And between the seating portion and the shaft attachment position to the base body in the swing arm,
A rotation member rotatably attached by a rotation center axis parallel to the shaft attachment axis to the base body; a screw hole formed in the rotation member at a right angle to the rotation center axis; A threaded shaft having a screw formed on the outer periphery and screwed into a screw hole of the rotating member, and a screw attached to the base body so as to be vertically swingable, including a forward / reverse rotation drive unit of the threaded shaft. An elevating type seat chair characterized by comprising a shaft drive device. 2. A rotation member screwed with the threaded shaft advances or retracts by rotation of the threaded shaft by a threaded shaft driving device, and the swing arm moves up and down by forward and backward movement of the rotation member. As the seat part moves up and down by swinging, the rotating member rotates, and the screwed shaft and the screwed shaft driving device screwed with the rotating member vertically swing. An elevating seat chair according to claim 1. 3. A pair of swing arms are provided in parallel with each other in the width direction of the seat portion, and a rotating member is provided between the two sets of swing arms. Alternatively, the lifting seat chair described in 2. 4. A pair of rocking arms is composed of two rocking arms, an upper rocking arm and a lower rocking arm, which are parallel to each other and which are parallel to each other. The upper rocking arm and the lower rocking arm. The seat portion is axially attached to the base at positions where the distance from the shaft attachment axis to the base body is equal to each other, and the seat portion shaft attachment axis of the upper swing arm and the seat portion shaft attachment axis of the lower swing arm are mutually The liftable sitting chair according to claim 3, wherein the chair is parallel. 5. A swing limit position detecting means for detecting an upper swing limit position and a lower swing limit position of the swing arm is provided. Elevating seat chair described.