JP3676764B2 - Lever-type angle adjustment chair - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lever-type angle adjustment chair that has an operation lever and can adjust the angle of a backrest.
[0002]
[Prior art and problems to be solved by the invention]
In this type of chair, the seat portion and the backrest have left and right side frames, and the ends of the right side frame of the seat portion and the backrest, for example, swing through an angle adjuster of a ratchet gear type, for example. It is connected freely. This angle adjuster is provided with an operation lever, and after the operation lever is operated to disengage the claw from the ratchet gear, the angle of the backrest is adjusted.
[0003]
On the other hand, the end portions of the left side frame of the seat portion and the backrest are simply swingably connected via a swing connecting tool. This swing coupling tool is provided with a pair of members that are pivotably coupled via a pivot, and a pair of side walls formed on the other member between a pair of side walls formed on one member. The two side walls are pivoted through the pivot.
Although it is preferable to keep the side wall of the other member along the side wall of the one member without a gap in order to eliminate backlash in the thrust direction in the swing coupling tool, the one and the other members are made of sheet metal. Since the positional accuracy is not so high, it is practically difficult to eliminate the play. This is because, if the gap between the two members is reduced so as to eliminate backlash between the sheet metal members with poor positional accuracy, for example, abnormal noise is generated or smooth swinging cannot be performed.
[0004]
Further, since the load received by the backrest is received only on the right side where the angle adjuster is disposed, there is also a problem that the backrest frame is easily twisted.
Therefore, it is conceivable to construct the backrest frame with a pipe that is thicker than the frame of the seat portion. However, in such a configuration, the material pipe cannot be shared, and the manufacturing cost increases.
The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a lever-type angle adjustment chair with little play in the rocking connection on the opposite side of the angle adjuster and to ensure smooth rocking. It is possible that no abnormal noise is generated. In addition, the strength of the back frame is high. In addition, the manufacturing cost is low.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is a lever-type angle adjustment chair comprising an angle adjuster capable of adjusting the angle of the backrest relative to the seat by operating the operation lever, wherein the seat and the backrest are provided. Are provided with pipe-shaped U-shaped frames each having a pair of side frames, and ends of the corresponding side frames of the U-shaped frames are connected to each other via the angle adjusting tool and the swingable connecting tool, respectively. And a third and second members connected to each other via a corresponding pivot, the first and second members being connected to each other via a corresponding pivot. A synthetic resin thrust receiver including a fourth member, wherein the third member includes a pair of opposing side walls, and the fourth member is interposed between the pair of side walls of the third member. The timber seen including, the fourth member includes a pipe, one end of the pipe is fitted and fixed to the corresponding side frames, parallel to the pair of side walls of the third member is crushed the other end flat A pivot insertion hole is formed in the flat portion, and the thrust receiving member is formed of an annular plate having a pair of side surfaces respectively opposed to the pair of side walls of the third member. A connecting hole is formed along the direction in which the pipe of the member of 4 extends so that the flat portion can be fitted, and the thrust receiving member is connected to the flat portion so as to be integrally rotatable in a state where the flat portion is fitted in the connecting hole. A pivot corresponding to the pair of side walls, the thrust receiving member, and the flat portion of the member 3 is inserted .
[0006]
Generally, in a lever type angle adjustment chair, the load applied to the backrest is received only on one side where the angle adjustment tool is arranged. Tended to grow. On the other hand, in the present invention, a thrust receiving member made of a synthetic resin is used for the swingable coupling tool, and the thrust receiving member can be made to follow the pair of side walls of the other party. Moreover, since the thrust receiving member is made of synthetic resin, smooth swinging can be ensured and no abnormal noise is generated.
[0008]
In particular, a flat part formed by crushing the pipe end is fitted into the connecting hole of the thrust receiving member to make it relatively unrotatable, and a pivot is inserted through them to constitute a rocking connecting tool that is free from backlash. can do.
According to a second aspect of the present invention, in the first aspect , the second member of the angle adjuster includes a pipe having a diameter equal to that of the pipe constituting the U-shaped frame of the backrest, and the pipe constituting the second member And the corresponding side frame pipes of the U-shaped frame of the backrest are inserted into the large-diameter connecting pipe and abutted with each other, and the inserted pipe is welded to the corresponding end of the connecting pipe. A reinforcing frame for connecting the side frames of the U-shaped frame is provided, the reinforcing frame is formed of a U-shaped pipe frame including a pair of side portions, and the pair of side portions of the reinforcing frame are pipes included in the fourth member. And welded along the connecting pipe, the welded part of the reinforcing frame to the connecting pipe is the butt of the pipe inserted through the connecting pipe. It is characterized in that disposed on both sides of the position.
[0009]
In the present invention, the structural strength can be increased by connecting the side frames of the U-shaped frame of the backrest with the reinforcing frame. In particular, by arranging the welded part of the reinforcing frame to the connecting pipe on both sides of the butted part of the pipe inserted through the connecting pipe, the connection strength between the pair of pipes inserted through the connecting pipe is markedly increased. Can be improved.
According to a third aspect of the present invention, in the second aspect , the U-shaped frame used for each of the seat portion, the backrest and the reinforcing frame is composed of pipes having the same diameter. In the present invention, the production cost can be significantly reduced by using a common pipe as a material.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a schematic perspective view of a lever-type angle adjustment chair according to an embodiment of the present invention. Referring to FIG. 1, a lever-type angle adjustment seat chair 1 (hereinafter also simply referred to as chair 1) as a lever-type angle adjustment chair includes a seat portion 2 placed on a placement surface such as a floor surface, and the like. A backrest 3 is provided. In addition, the seat 1 includes an angle adjustment tool 5 that can adjust the angle of the backrest 3 with respect to the seat 2 by operating the operation lever 4 only on one side.
[0011]
In the present embodiment, the case where the chair is a sitting chair will be described. However, the present invention is not limited to the sitting chair, and can be applied to a chair with legs.
The seat portion 2 includes a U-shaped pipe-shaped frame 6, and the U-shaped frame 6 includes a pair of left and right side frames 6 a and 6 b and a connecting frame 6 c that connects the side frames 6 a and 6 b. The connecting frame 6c is disposed on the front side.
Similarly, the backrest 3 includes a U-shaped pipe-made frame 7, and this U-shaped frame 7 includes a pair of left and right side frames 7 a and 7 b and a connecting frame 7 c that connects the side frames 7 a and 7 b. The connecting frame 7c is disposed on the upper side.
[0012]
In FIG. 1, the position between the opposite ends of the side frames 6 a and 7 a on the left side (the right side for the user sitting on the seat 1) is adjusted around the pivot 8 through the angle adjuster 5. Connected as possible.
On the other hand, the opposite end portions of the side frames 6b and 7b on the right side are connected via a swingable connection tool 9. The swingable connection tool 9 connects both side frames 6b and 7b to the pivot 10. It is connected so that it can swing freely around. In this embodiment, a synthetic resin (for example, polyamide resin) thrust receiving member 36 is provided on the swingable coupler 9 so as to receive a thrust load.
[0013]
A reinforcing tape 11 made of synthetic resin is looped around an intermediate portion in the longitudinal direction of the pair of side frames 6a and 6b of the U-shaped frame 6 of the seat portion 2, for example, approximately the central portion. Similarly, a reinforcing tape 12 made of synthetic resin is looped around the upper part of the pair of side frames 7a and 7b of the U-shaped frame 7 of the backrest 3 in FIG. 1 (that is, the portion near the connecting frame 7c). It has been. Each of the reinforcing tapes 11 and 12 is made of, for example, a heat-sealable tape, and each superposed portion is fixed by heat-seal.
[0014]
Further, a reinforcing frame made of a pipe-shaped U-shaped frame is provided between the side frames 7a and 7b at the lower part of the U-shaped frame 7 of the backrest 3 in FIG. 13, the reinforcing frame 13 and the U-shaped frame 7 are combined to improve the overall strength. The reinforcing frame 13 has side frames 13a and 13b as a pair of side portions, and a connecting frame 13c that connects the side frames 13a and 13b. Specifically, the pair of side frames 13a and 13b of the reinforcing frame 13 are welded to a connecting pipe 15 and a pipe 38 to be described later.
[0015]
Further, the U-shaped frame 6 of the seat portion 2, the U-shaped frame 7 of the backrest 3, and the pipes constituting the reinforcing frame 13 have the same diameter, so that the material is shared.
Referring to FIG. 2, which is an exploded perspective view of the main part of the seat 1, the angle adjuster 5 includes a first member 14 connected to the side frame 6 a of the U-shaped frame 6 of the seat 2, and a backrest. 3 and a second member 16 connected to the side frame 7a of the U-shaped frame 7 via a connecting pipe 15. The first and second members 14 and 15 are slidably connected to each other via the pivot 8 described above.
[0016]
The second member 16 includes a swing gear 17 that is swingably supported by the first member 14 via the pivot 8, and a pipe 18 that is fixed to the swing gear 17.
2 and 3, the pipe 18 and the side frame 7a are inserted into the connecting pipe 15 and welded to the corresponding end portions 15a and 15b of the connecting pipe 15, respectively. Further, the pipe 18 and the side frame 7 a are butted against each other at a butting portion 19 in the connecting pipe 15.
[0017]
Reference numerals 20 and 21 denote welding parts arranged on both sides of the butting part 19. These welding parts 20 and 21 are parts when the side frame 13 a of the reinforcing frame 13 is connected and welded to the pipe 15.
Referring to FIG. 2, the first member 14 includes a housing 22 that houses the swing gear 17 between a pair of side walls 22 a and 22 b, and a pipe 23 that is integrally formed with the housing 22. The end of the side frame 6a of the U-shaped frame 6 is inserted into the pipe 23 and fixed to the pipe 23 by welding.
[0018]
A locking pin 24 is fixed to the inner side wall 22 a of the housing 22. One end 25 a of the spiral spring 25 is locked to the locking pin 24. Although not shown in the figure, the central portion which is the other end of the spiral spring 25 is locked to the pivot 8. As a result, the spiral spring 25 is urged to rotate in the direction X where the U-shaped frame 7 of the backrest 3 rises. Reference numeral 30 denotes a cover that covers the side of the spiral spring 25.
On the other hand, although not shown, the housing 22 has a lock body that can be engaged with the teeth of the swing gear 17 between the pair of side walls 22a and 22b. Is biased by a biasing member (not shown).
[0019]
The operation lever 4 is lifted in the Y direction to cause the lock body to disengage from the swing gear 17 against the urging member. Accordingly, the U-shaped frame 7 of the backrest 3 is automatically raised to, for example, an upright position by the spiral spring 25.
The operating lever 4 includes a base 26 that is swingably supported on the outer side wall 22b of the housing 22 in order to operate the lock body, a long lever 28 that is fixed to the base 26 with a screw 27, A knob 29 fixed to the end of the lever 28.
[0020]
The swingable coupler 9 will be described with reference to FIG. The swingable connection tool 9 includes a third member 31 and a fourth member 32 that are connected to each other via the pivot 10 so as to be relatively rotatable.
The third member 31 includes a housing 33 having a pair of side walls 33 a and 33 b facing each other, and a pipe 34 formed integrally with the housing 33. The pair of side walls 33a and 33b is formed with a pivot insertion hole 35 through which the pivot 10 is inserted (FIG. 4 shows only the pivot insertion hole 35 of one side wall 33a). The pipe 34 is inserted into the side frame 6b of the U-shaped frame 6 of the seat portion 2, and is fixed to the side frame 6b by welding.
[0021]
The fourth member 32 includes a synthetic resin thrust receiving member 36 interposed between the pair of side walls 33a and 33b of the third member 31, and a flat portion 37 that connects the thrust receiving member 36 so as to be integrally rotatable. And a pipe 38.
The other end of the pipe 38 is inserted into the end of the side frame 7b of the U-shaped frame 7 of the backrest 3, and is fixed by welding.
One end of the pipe 38 is crushed into a substantially rectangular shape and formed in the flat portion 37 as described above. The flat portion 37 is disposed in parallel with the pair of side walls 33 a and 33 b of the third member 31. Further, the flat portion 37 is formed with a pivot insertion hole 39 through which the pivot 10 is inserted.
[0022]
The thrust receiving member 36 is formed of, for example, a circular annular plate having a pair of side surfaces 40 (only one side surface 40 is shown in FIG. 4) facing the pair of side walls 33a and 33b of the third member 31. The thrust receiving member 36 is formed with a pivot insertion hole 41 through which the pivot 10 is inserted in a manner that penetrates the pair of side surfaces 40. Radial ribs 44 and annular ribs 45 are formed on the side surface 40 for reinforcement, and lightening is achieved by reducing the thickness by recesses 46 defined by these ribs 44 and 45.
[0023]
Referring to FIGS. 4 and 5, a connecting hole 43 into which the flat portion 39 can be fitted along the extending direction of the pipe 38 is formed in the peripheral surface 42 of the thrust receiving member 36. The connecting hole 43 has, for example, a substantially rectangular shape that matches the shape of the flat portion 37, and the thrust receiving member 36 is connected to the flat portion 37 so as to be integrally rotatable in a state where the flat portion 37 is fitted in the connecting hole 43.
Specifically, the two-surface width W formed by the pair of opposing side edges 37 a of the flat portion 37 is substantially equal to the two-surface width of the pair of inner walls 43 a corresponding to the connection hole 43.
[0024]
Further, the pivot 10 is inserted into the pivot insertion hole 35 of the third member 31, the pivot insertion hole 41 of the thrust receiving member 36 of the fourth member 32, and the pivot insertion hole 39 of the flat portion. Accordingly, the fourth member 32 is swingably supported by the third member 31.
When the fourth member 32 on the backrest 3 side is swung, the pair of side surfaces 40 of the synthetic resin thrust receiving member 36 is in sliding contact with the corresponding side walls 33a and 33b of the third member 31 smoothly.
[0025]
According to the present embodiment, by using the thrust receiving member 36 made of synthetic resin for the swingable connecting device 9 laid out on the opposite side of the angle adjuster 5, the pair of side walls 33a and 33b are not rattled. Can be along. Moreover, since the thrust receiving member 36 is made of synthetic resin, smooth swinging with respect to the counterpart sheet metal member can be ensured, and no abnormal noise is generated.
Further, the flat portion 37 formed by crushing the end of the pipe 38 is fitted into the connecting hole 43 of the thrust receiving member 36 so that the relative rotation is impossible, and the pivot 10 is inserted into the thrust receiving member 36 and the flat portion 37. Thus, it is possible to configure the rocking coupler 9 free from backlash at low cost.
[0026]
Further, the side frames 7a and 7b of the U-shaped frame 7 of the backrest 3 can be connected by the reinforcing frame 13 to increase the structural strength. In particular, as shown in FIG. 3, the side frame 7 a made of a pipe is inserted into the connecting pipe 15 through the welded portions 21 and 22 where the side frame 13 a as the side portion of the reinforcing frame 13 is welded to the connecting pipe 5. In addition, by disposing the second member 16 on both sides of the butted portion 19 of the pipe 18, the connection strength between the side frame 7 a inserted into the connecting pipe 15 and the pipe 18 can be remarkably improved. .
[0027]
In addition, since the U-shaped frames used for the side frame 6 of the seat 2, the side frame 7 of the backrest 3 and the reinforcement frame 13 are made of pipes having the same diameter, production costs are greatly reduced through the common use of pipes as materials. Can be cheap.
The present invention is not limited to the above-described embodiment. For example, as shown in FIG. 6, a reinforcing frame made of a long plate member is used instead of the reinforcing frame 13 made of a U-shaped frame in FIG. 47 may be used. By connecting the end portions 47 a and 47 b of the reinforcing frame 47 to the pipe 15 and the pipe 38, the side frames 7 a and 7 b are connected and reinforced by the reinforcing frame 47. In this case, the pipe material of the U-shaped frames 6 and 7 of the seat portion 2 and the backrest 3 can be shared, but a sufficient cost reduction effect can be obtained.
[0028]
In addition, various modifications can be made within the scope of the claims of the present invention, such as application of the present invention to a chair with legs.
[Brief description of the drawings]
FIG. 1 is a partially broken schematic perspective view of a lever-type angle adjustment seat chair as a lever-type angle adjustment chair according to an embodiment of the present invention.
FIG. 2 is an exploded perspective view of the angle adjuster and its surroundings.
FIG. 3 is a perspective view of the periphery of a welded portion of a connecting pipe and a reinforcing frame.
FIG. 4 is an exploded perspective view of the swingable coupler.
FIG. 5 is a schematic cross-sectional view showing a state in which a flat portion formed by crushing an end portion of a pipe is inserted into a connecting hole of a thrust receiving member.
FIG. 6 is a schematic perspective view of a main part of a lever-type angle adjusting seat chair according to another embodiment of the present invention.
[Explanation of symbols]
1 Lever-type angle adjustment chair (Lever-type angle adjustment chair)
2 Seat part 3 Back 4 Operation lever 5 Angle adjustment tool 6, 7 U-shaped frame 8, 10 Axis 9 Swingable connection tool 11, 12 Reinforcement tape 13 Reinforcement frame 14 First member 15 Connecting pipe 16 Second member 17 Swing gear 18 Pipe 19 Butting part 20, 21 Welding part 22 Housing 22a, 22b Side wall 23 Pipe 24 Locking pin 25 Spiral spring 26 Base 27 Lever 28 Screw 29 Knob 30 Cover 31 Third member 32 Fourth member 33 Housing 33a, 33b Side walls 34, 38 Pipe 35, 39, 41 Pivot insertion hole 36 Thrust receiving member 37 Flat portion 40 Side surface 42 Perimeter surface 43 Connection hole 44 Radial rib 45 Annular rib 46 Recess 47 Reinforcement frame

Claims (3)

In a lever-type angle adjustment chair comprising an angle adjuster that can adjust the angle of the backrest relative to the seat by operating the operation lever,
The seat part and the backrest each have a pipe-shaped U-shaped frame having a pair of side frames, and the ends of the corresponding side frames of the U-shaped frame are connected to each other via the angle adjusting tool and the swingable connecting tool, respectively. And
The angle adjuster includes first and second members connected to each other via a corresponding pivot so as to be relatively rotatable,
The swingable coupling tool includes third and fourth members that are coupled to each other via a corresponding pivot shaft so as to be rotatable relative to each other.
With a pair of side walls which the third member is opposed, the fourth member saw including a thrust receiving member made of a synthetic resin interposed between a pair of side walls of the third member,
The fourth member includes a pipe, and one end of the pipe is fitted and fixed to the corresponding side frame, and the other end is crushed to be a flat portion parallel to the pair of side walls of the third member. A pivot insertion hole is formed in the flat part,
The thrust receiving member is composed of an annular plate having a pair of side surfaces respectively opposed to the pair of side walls of the third member;
A connecting hole is formed on the circumferential surface of the thrust receiving member along the direction in which the pipe of the fourth member extends, and the thrust receiving member is flat when the flat portion is fitted in the connecting hole. Are connected to be rotatable together
A lever-type angle adjusting chair, wherein a pivot corresponding to the pair of side walls, the thrust receiving member and the flat portion of the third member is inserted . In Claim 1, the second member of the angle adjuster includes a pipe having a diameter equal to that of the pipe constituting the U-shaped frame of the backrest,
The pipe constituting the second member and the pipe of the corresponding side frame of the U-shaped frame of the backrest are inserted into the large-diameter connecting pipe and butted against each other, and the inserted pipe is connected to the corresponding end of the connecting pipe. Welded to the part,
A reinforcing frame for connecting the side frames of the U-shaped backrest frame is provided. The reinforcing frame is a U-shaped pipe frame including a pair of side portions, and the pair of side portions of the reinforcing frame is included in the fourth member. Welded along the pipe and the connecting pipe,
The lever type angle adjustment chair characterized by arrange | positioning the welding site | part to the connecting pipe of a reinforcement frame on both sides on both sides of the butting | matching part of the pipe penetrated by the said connecting pipe . 3. The lever-type angle adjusting chair according to claim 2, wherein the U-shaped frame used for each of the seat portion, the backrest and the reinforcing frame is composed of pipes having the same diameter .

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