JP3776682B2 - Chair with control lever - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an operation lever mounting structure in a chair.
[0002]
[Prior art]
A chair for operating the gas cylinder is provided on a chair that supports the seat body by a gas cylinder (gas spring) so as to be movable up and down. An operation lever for adjusting the locking posture of the backrest or an operation lever for switching the backrest between the locked state and the free state may be provided.
[0003]
8 to 9 show an example of a mounting structure of the operation lever 31 for operating the gas cylinder 30 for raising and lowering the seat body, FIG. 8 is a plan view, and FIG. 8A is the IXA-IXA of FIG. FIG.
[0004]
In these drawings, reference numeral 32 denotes a support frame, and the support frame 32 includes a base 33 formed in an upward U-shaped cross section and a bracket 34 fixed to the inside of the base 33 by welding, The upper end of the gas cylinder 30 is fitted to a bush 35 fixed to the base 33 and the bracket 34 by welding.
[0005]
The operation lever 31 is formed by bending a round bar (or a thick wire) in a step shape (crank shape) in a plan view, and one end 31a thereof is located above the push valve 36 in the gas cylinder 30 and the other end. The part 31b is exposed to the outside of the support frame 32 and extends in the left-right direction. A synthetic resin knob 37 is attached to the other end.
[0006]
A midway portion extending in the front-rear direction inside the support frame 32 of the operation lever 31 is a central shaft 31c that overlaps the upper surface of the bracket 34, and a synthetic resin bearing member 38 is overlaid on the central shaft 31c. It is fixed to the bracket 34 with screws 39. The operation lever 31 is opened in the side plate 33a of the base 33 and penetrates through the elongated hole 40. The elongated lever 40 holds the operation lever 31 so that it cannot be displaced forward and backward.
[0007]
As shown in FIG. 9B, a pawl 38a is formed at one end of the bearing member 38, while an engagement hole 41 is provided in the bracket 34 so that the pawl 28a cannot be removed. some others and fixed with one screw 39.
[0008]
In any case, when the fingertip is lifted by placing the fingertip on the knob 37, the operation lever 31 rotates in the direction of the white arrow in FIG. 9A about the central axis 31c. For this reason, the push valve 30a is pushed down, the lock of the gas cylinder 30 is released, and the height of the seat body can be adjusted.
[0009]
[Problems to be solved by the invention]
When the operating lever 31 is rotated in the direction indicated by the white arrow in FIG. 9A, the central shaft 31c of the operating lever 31 is pressed against the bracket 34. However, since the support strength of the bracket 34 is high, strong force Thus, there is no particular problem even if the operation lever 31 is rotated.
[0010]
On the other hand, as shown by a black arrow in FIG. 9A, a seated person may accidentally rotate the operation lever 31 in the reverse direction. In this case, since the operation lever 31 is rotated so as to raise the central shaft 31c upward, an external force acting on the operation lever 31 acts to cause the bearing member 38 from the bracket 34, and the bearing member 38 is damaged or deformed. There was a fear.
[0011]
Further, since the bearing member 38 is conventionally fixed with the screw 39, there is a problem that the operation of mounting the operation lever 31 is troublesome.
[0012]
The present invention aims to solve these problems.
[0013]
[Means for Solving the Problems]
The present invention comprises a leg having a gas cylinder, a metal plate support frame provided at the upper end of the gas cylinder, and an operation lever for operating a push valve of the gas cylinder, The center axis of the operation lever is attached to the support frame so that the center axis of the operation lever can be rotated. In the chair in which the push valve of the gas cylinder is pushed at one end of the operation lever that is bent on the central axis, the central axis of the operation lever is superimposed on the upper surface of the support frame. and inverted L-shaped metal plate retaining pieces of the laterally sliding capable of Hamada' the central shaft is provided integrally with and perpendicular to the center axis in the state, further, to the support frame, A stopper made of synthetic resin for preventing the central axis of the operation lever from coming out of the holding piece is mounted by being fitted into an engagement hole formed in the support frame against elastic deformation, and The support frame includes a base having a side plate that opens upward, and the stopper is held immovably on the opposite side of the holding piece 22 by the side plate of the base.
[0014]
According to a second aspect of the present invention, the holding piece is formed by cutting and raising the support frame, and a locking claw provided in the stopper is fitted into the hole formed by raising and holding the holding piece against elasticity. An engagement hole is formed.
[0015]
[Operation and effect of the invention]
In the present invention, since the operation lever is sandwiched between the support frame and the metal plate holding piece, even if the operation lever is rotated so that its central axis is separated from the support frame due to an erroneous operation, the member is damaged. The center axis of the operation lever can be firmly supported without incurring or deformation.
[0016]
The operating lever is mounted on the support frame by using the deformation against the elasticity of the stopper after the center axis is fitted to the holding piece by sliding with the center axis superimposed on the support frame. Since it can be attached to the support frame with a simple procedure, the workability of the operation of attaching the operation lever can be greatly improved.
[0017]
The holding piece manufactured separately from the support frame can be fixed to the support frame by welding or the like, and various stopper engaging means can be selected. In addition, when the holding piece is cut and raised in the support frame, and the hole formed by raising and holding the holding piece is used as an engagement hole for attaching the stopper, the structure can be simplified because it is only necessary to process the support frame by sheet metal processing. Can be
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0019]
(1). First embodiment (FIGS. 1 to 5)
1 to 5 show the first embodiment. FIG. 1 is a right side view of the chair, FIG. 2 is a front view of the chair, FIG. 3 is a perspective view of the main part, and FIG. 5, (A) is a plan view of the main part, (B) is a sectional view taken along the line BB of (A), (C) is a sectional view taken along the line CC of (A), and (D) is a sectional view taken along the line DD of (A). It is sectional drawing.
[0020]
As shown in FIG. 1 and FIG. 2, the chair includes a leg 1 having a gas cylinder 2, a support frame 3 provided at the upper end of the gas cylinder 2, a seat body 4 attached to the support frame 3, and a backrest 5. And. The gas cylinder 2 is covered with a support cover 6, and the support frame 3 is covered with a base cover 7.
[0021]
The chair of the present embodiment is a synchro type in which the seat body 4 is tilted backward while moving backward in conjunction with the back tilt of the backrest 5, but the support structure of the seat body 4 and the backrest 5 is directly related to the present invention. The explanation is omitted.
[0022]
As shown in FIGS. 3 and 4, the support frame 3 includes a base 8 that opens upward, a first bracket 9 that is fixed to the rear half of the base 8, and a downward surface that is fixed to the lower surface of the base 8 near the rear part. The left and right second brackets 10 are provided.
[0023]
A first shaft 12 for attaching an intermediate fitting 11 that supports the front half of the seat body 4 passes through the front portion of the base 8 so as to be slidable back and forth, and a back support member 13 is inserted into the second bracket 10. The 2nd axis | shaft 14 for attaching to back tilting freely penetrates. The back support member 13 is fixed with a back concave 15 having a concave shape that wraps around the person's waist. The backrest 5 is attached to the back outer 15.
[0024]
A bush 16 opened vertically is fixed to the base 8 and the first bracket 9 by welding or the like, and the gas cylinder 2 is fitted thereto from below. At the upper end of the gas cylinder 2, a push valve 17 for switching the gas cylinder 2 between a lock state in which the gas cylinder 2 cannot expand and contract and a free state in which the gas cylinder 2 can expand and contract is projected.
[0025]
An operation lever 18 for operating the gas cylinder 2 is attached to the support frame 3. The operation lever 18 has the same configuration as that described as the conventional example, one end 18 a extends above the gas cylinder 2, and the other end 18 b extending in the left-right direction outside the support frame 3 has a knob 19. Is inserted. The side plate 8a of the base 8 has a long hole 20 into which the operation lever 18 can be inserted. As shown in FIG. 1, the base cover 7 is formed with a notch 21 for allowing the operation lever 18 to rotate.
[0026]
For example, as clearly shown in FIG. 4, an inverted L-shaped holding piece 22 that surrounds the central shaft 18 c of the operation lever 18 from one side is formed by cutting and raising the right side of the first base 8. . A space is provided between the upper end of the holding piece 22 and the right side plate 8a of the base 8 so that the central shaft 18c of the operation lever 18 can be fitted and removed. In addition, an engagement hole 23 formed by cutting and raising the holding piece 22 is vacated in a portion of the support frame 3 between the holding piece 22 and the right side plate 8a of the base 8. A stopper 24 that holds the central shaft 18c of the operating lever 18 from the holding piece 22 so as not to be detached is attached using the joint hole 23.
[0027]
The stopper 24 is made of a synthetic resin, and the center shaft 18c of the operation lever 18 is held so as not to be detached from the holding piece 22 by being fitted tightly between the holding piece 22 and the right side plate 8a of the base 8. ing. Further, the stopper 24 is set to have a length that protrudes from both the front and rear sides of the holding piece 22, a pressing portion 18 a that overlaps the central axis 18 c of the operation lever 18 from above, and front and rear of the engagement hole 23. A downward locking claw 18b engaged with the edge by elastic deformation is formed.
[0028]
The operation lever 18 is passed through the long hole 20 of the base 8 with its one end first, so that the central shaft 18c enters the inside of the base 8, and then the central shaft 18c is moved along the right side plate 8a of the base 8. The center shaft 18c is fitted into the holding piece 22 by sliding in the left direction as a whole after being tilted, and then the locking claw 18b of the stopper 24 is fitted into the engagement hole 23 against its elasticity. Thus, it is attached to the support frame 3. In this case, since no tool is required, the operation lever 18 can be mounted efficiently.
[0029]
Even if the seated person erroneously operates the operation lever 18 and pushes it down, the central shaft 18 c of the operation lever 18 is reliably supported by the holding piece 22. Further, when the central shaft 18c is horizontally rotated in the direction indicated by the arrow a in FIG. 5A, an external force is applied to the stopper 24. In this case, only the compressive force is applied to the stopper 24. 24 can withstand external force without being damaged and deformed.
[0030]
As a result, a high support strength can be obtained with respect to the rotation of the operation lever 18 in any direction. As indicated by the alternate long and short dash line in FIG. 5A, the stopper 24 may be extended to the vicinity of the horizontally long intermediate portion 18d of the operation lever 18.
[0031]
(2). Second embodiment (FIGS. 6 to 7)
6 and 7 show a second embodiment, in which FIG. 6 is a partially broken perspective view, FIG. 7A is a plan view of the main part, and FIG. 6B is a sectional view taken along the line BB of FIG. (C) is a cross-sectional view taken along the line CC in (A), and (D) is a cross-sectional view taken along the line DD in (A).
[0032]
In the present embodiment, the stopper 24 is provided with a longitudinally engaging groove 24 c that fits in the central axis 18 c of the operation lever, and the stopper 24 extends to the horizontally long intermediate portion 18 c of the operation lever 18. Further, the stopper 24 is formed with a pair of front and rear legs 24d, the rear legs are fitted in the engagement holes 23 of the first base 8, and the front legs 24d are positioned in front of the first base 8. is doing. Therefore, the stopper 24 is in a state straddling the portion of the first base 8 that is in front of the engagement hole 23, and is thus held so as not to fall.
[0033]
The engaging groove 24c of the stopper 24 is formed on the left and right side surfaces, and the front and rear legs 24d are set to have the same front and rear width. For this reason, it can be mounted without directionality.
[0034]
If the operation lever 18 is erroneously operated and horizontally rotated in the direction indicated by the arrow a in FIG. 7A, a large moment may be applied to the holding piece 22 of the operation lever 18. In this case, in this embodiment, since the stopper 24 is located up to the horizontally long intermediate portion 18c of the operation lever 18, the rotation fulcrum of the operation lever 18 moves to the near side. The moment due to horizontal rotation can be significantly reduced, and the mounting strength of the operating lever 18 can be further improved.
[0035]
In the case of the first embodiment, the same effect as that of the second embodiment can be obtained by extending the stopper 24 to the horizontal intermediate portion 18c of the operation lever 18 as shown by a one-dot chain line in FIG.
[0036]
When the operation lever 18 is horizontally rotated in the direction opposite to the arrow a in FIG. 7A, the operation lever 18 is held on the outer surface of the base 8 and cannot be rotated. There is no need to consider the operation.
[0037]
(3). Others The present invention can be embodied in various forms other than the above embodiment. For example, the place where the operation lever is attached is not limited to the first bracket as in the present embodiment, and may be attached to the base, for example. That is, when the support frame is composed of a plurality of members, it may be attached to any one of the constituent members, and the attachment position may be set according to the use and shape of the operation lever.
[0038]
Further on, the bar which is a material of the operation lever also includes a pipe.
[Brief description of the drawings]
FIG. 1 is a right side view of a chair according to a first embodiment.
FIG. 2 is a front view of the chair.
FIG. 3 is a perspective view of a main part.
FIG. 4 is a perspective view of a main part separated and broken.
[Fig. 5] (A) is a plan view of the main part, (B) is a cross-sectional view taken along the line BB of (A), (C) is a cross-sectional view taken along the line CC of (A), and (D) is a cross-sectional view taken along the line DD of (A) FIG.
FIG. 6 is a perspective view of a main part of the second embodiment.
7A and 7B are diagrams showing a second embodiment, in which FIG. 7A is a plan view of a main part, FIG. 7B is a cross-sectional view taken along the line BB of FIG. ) Is a cross sectional view taken along line DD of (A).
FIG. 8 is a partial plan view of a conventional example.
9A is a cross-sectional view taken along the line IXA-IXA in FIG. 8, and FIG. 9B is a diagram showing a modification.
[Explanation of symbols]
1 leg 2 gas cylinder for raising and lowering the seat 3 support frame 4 seat 8 base
8a Base side plate 9 First bracket 17 Push valve 18 Operation lever
18a One end 18c Center shaft 22 Holding piece 23 Engaging hole 24 Stopper 24b Locking claw

Claims (2)

A leg 1 having a gas cylinder 2, a support frame 3 made of a metal plate provided at the upper end of the gas cylinder 2, and an operation lever 18 for operating a push valve 17 of the gas cylinder 2, The operation lever 18 is made of a bar and is formed in a crank shape in plan view by bending both ends of the center shaft 18c overlapping the upper surface of the support frame 3, and the center shaft 18c of the operation lever 18 is rotated. A chair that is attached to the support frame so as to obtain, and is configured such that the push valve 17 of the gas cylinder 2 is pushed at one end 18a formed by bending the central lever 18c of the operation lever 18.
When the support frame 3 is slid in the lateral direction perpendicular to the center axis 18c with the center axis 18c of the operation lever 18 being superimposed on the upper surface of the support frame 3, the center axis 18c can be fitted and removed. The metal plate holding piece 22 is integrally provided, and a stopper made of a synthetic resin for preventing the central shaft 18c of the operation lever 18 from coming out of the holding piece 22 in the support frame 3 is also provided. 24 is mounted by being fitted into an engagement hole 23 formed in the support frame 3 against elastic deformation, and the support frame 3 includes a base 8 that opens upward and has a side plate 8a. The stopper 24 is held immovably on the side opposite to the holding piece 22 by the side plate 8a of the base 8.
A chair with an operating lever. The holding piece 22 is formed by cutting and raising the support frame 3, and a locking claw 24b provided in the stopper 24 is fitted into the hole formed by cutting and raising the holding piece 22 against elasticity. Formed with the engagement hole 23;
A chair provided with the operation lever according to claim 1 .

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