JP3525239B2 - Chair backrest slide device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backrest slide device for a chair, and more particularly, in a chair in which a backrest part tilts back and forth and a seat part slides back and forth, the backrest part is further vertically moved. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair backrest slide device for imparting a sliding movement function.

[0002]

2. Description of the Related Art Conventionally, a chair in which the backrest tilts forward and backward and the seat slides forward and backward has been provided by the applicant under the trade name "Vertebra" to provide an optimal weight distribution and excellent lumbo-spine support. It has been well received because it is ergonomically excellent in that it can be performed and the positions of the backrest and the seat automatically change according to the sitting posture of the seated person.

However, when the seated person takes a reclining position in which the upper body is bent backward from the upright position, the back of the seated person slightly slides up and down the backrest part, causing tension and wrinkles on the clothes. This problem commonly occurs in other chairs.

Therefore, there has been proposed a chair in which the backrest tilts forward and backward, the seat slides forward and backward, and the backrest slides up and down (Japanese Patent Laid-Open No. 3-3003).
188805). The backrest slide mechanism proposed in this publication is provided with slide pipes which are open downward to receive a pipe in which an upper joint mechanism of an elastic joint mechanism is housed, on both sides of the backrest portion, and the pipe slides in the slide pipe. Is guided and received, and a compression coil spring is received in the slide tube and is compressed between a shoulder on the top of the slide tube and a spring retaining member received in the pipe;
Further, the spring holding member is movable in the pipe in its axial direction, and the lower end of the spring holding member is abutted against the spring abutting member of the elastic joint mechanism.

Here, the slide tube is made of synthetic resin, and the pipe is made of metal. In this case, since the slide tube made of synthetic resin needs to have a draft of the mold, the inner diameter becomes a taper shape gradually decreasing from the open end of the lower end to the upper end, whereas the metal pipe is full length. Since it has the same outer diameter throughout, when the pipe is slidably inserted in the slide tube,
It is inevitable that rattling will occur. Further, since the slide tube is simply inserted into the pipe, when the backrest is lifted during the manufacture of the chair, the backrest and the slide tube may come out of the pipe and be disassembled.

[0006]

SUMMARY OF THE INVENTION In view of the above-mentioned situation, the present invention aims to solve the problems that the backrest can be smoothly moved up and down without rattling and after the backrest slide mechanism is assembled. Is to provide a backrest slide device for a chair that does not disassemble even when the backrest is lifted.

[0007]

According to the present invention, in order to solve the above-mentioned problems, an elastic joint mechanism that allows the backrest portion to tilt forward and backward is provided on the backrest support portions of both side frames attached to the legs. A backrest slide device for a chair, which is provided between the backrest part and the backrest part and is elastically slidable toward the joint part of the elastic joint mechanism. The upper end is closed on both sides of the backrest part. And forming a tubular casing that is open downward, insert a synthetic resin slide tube into the casing, and slidably insert a metal pipe extending upward from the joint portion into the slide tube. At the same time, a compression coil spring is interposed between a spring receiving member made of a synthetic resin attached to the upper end of the pipe and the upper end surface inside the casing, and the compression coil spring is provided in a vertical groove penetrating the casing and the slide pipe. With a stopper member for slidably disposed projecting from the type, projecting the stopper member an inward resilient piece which is integrally formed at the lower end of the slide tube
Was the circumferential position slidably in pressure contact with the outer circumferential surface position of the pipe opposite <br/>, is integrally formed on the spring receiving member
Two outward through the opening formed in the pipe from the inside formed by slidably in pressure contact with the inner peripheral surface of the slide tube
The elastic piece sandwiches the circumferential position where the inward elastic piece is provided.
Thus, a backrest slide device of a chair which is slidably contacted at both sides is constructed.

Further , the present invention is for solving the above-mentioned problems.
The backrest support part of both frames attached to the legs
In addition, through the elastic joint mechanism that allows the backrest to tilt forward and backward.
Is provided between the backrest portion and the backrest portion, and the elastic joint machine
A chair that can be elastically slid toward the joints of the structure
A backrest slide device having upper ends on both sides of the backrest part.
Forming a tubular casing that is closed and open downwards
Insert a synthetic resin slide tube into the casing.
Wear a metal pipe that extends upward from the joint.
The slide tube is slidably inserted and
The synthetic resin spring bearing member attached to the upper end of the pipe and the front
Insert a compression coil spring between the casing and the upper end surface.
Mounted vertically through the casing and slide tube.
A stopper member protruding from the pipe can slide in the groove
Located at the bottom of the slide tube
Made inward elastic piece slidable on the outer peripheral surface of the pipe
Outward elasticity pressed against and integrally formed with the spring receiving member
The piece is inserted through the opening formed in the pipe from the inside and the slurry is
It is slidably pressed against the inner peripheral surface of the id tube and
The spring receiving member contains the compressed coil spring inside.
Has a recess opening upward, and the compression is performed at the bottom of the recess.
A backrest of a chair that supports one end of a coil spring
The slide device was constructed .

Further, the stopper member is provided at a position where the stopper member comes into contact with the lower end of the vertical groove of the casing in a stationary state in which the backrest portion is at the uppermost position, and the stopper member of the casing, the slide pipe and the pipe at the time of assembly is installed. Positioning in the circumferential direction is preferable in order to prevent the backrest portion from accidentally coming out upward.

Further, if a cushioning plate is provided on the upper end surface inside the casing, and the upper end of the spring receiving member abuts on the cushioning plate when the backrest slides to the lowermost position. The generation of impact noise and the discomfort caused by the impact are alleviated.

[0011]

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a more detailed description will be given based on an embodiment of the present invention shown in the accompanying drawings. FIG. 1 is an overall perspective view of a chair according to the present invention, FIGS. 2 and 3 show a typical embodiment of a backrest slide device for a chair according to the present invention, and FIG. 4 is a front view of a main part in an assembled state, FIG. 5 shows an exploded perspective view of a main part, and FIGS. 6 to 10 show a slide tube, in which 1 is a frame, 2 is a backrest part, 3 is an elastic joint mechanism, and 4 is a backrest slide device. ing. Further, FIG. 11 shows a tilted state of the elastic joint mechanism 3.

In the chair according to the present invention, both side frames 1 and 1 made of metal pipes curved in a substantially L shape in a side view are attached to both sides of a leg portion A, and a backrest support portion standing upright at the rear portion of the frame 1. 5, a backrest slide device 4 is provided between the backrest portion 2 and the backrest portion 2 via an elastic joint mechanism 3 that allows the backrest portion 2 to be tilted back and forth, and the backrest portion 2 is made elastic by the elastic joint mechanism 3. The backrest slide device 4 allows the backrest portion 2 to be elastically tilted to the front and back.
The structure is such that it can elastically slide and move toward the joint part 6. The seat portions B mounted on the seat supporting portions of the frames 1 and 1 on both sides are elastically slidable back and forth with respect to the frame 1 and the legs A. The portion of the frame 1 exposed from the seat portion B and the backrest portion 2 is covered with a bellows.

The backrest slide device 4 of the present invention forms a tubular casing 7 with its upper end closed and opened downward on both sides of the backrest portion 2, and a slide pipe 8 made of synthetic resin is provided in the casing 7. A metal pipe 9 that is inserted and extends upward from the joint 6 is slidably inserted into the slide pipe 8, and a synthetic resin spring receiving member 10 attached to the upper end of the pipe 9 and Casing 7
A compression coil spring 12 is interposed between the upper end surface 11 inside and a stopper member 15 protruding from the pipe 9 is slid in vertical grooves 13 and 14 formed through the casing 7 and the slide tube 8. An inward elastic piece 16 which is movably disposed and integrally formed on the lower end of the slide tube 8 slidably presses the outer peripheral surface of the pipe 9 and is integrally formed on the spring receiving member 10. The opening 17 formed in the pipe 9 penetrates 17 from the inside, and is slidably pressed against the inner peripheral surface of the slide tube 8.

Although not shown, the backrest 2 has a structure in which a urethane foam cushion is provided on the front side of the outer shell provided with the casing 7, and the surface of the cushion is crossed. An inner shell covered with a cover sheet of leather or the like is fitted, and the peripheral edge of the cover sheet is sandwiched between the outer shell and the inner shell.

The slide tube 8 is inserted into the casing 7, and an engaging hole 19 formed at the upper end of the inside of the casing 7
In addition, in a state in which the engaging claws 20 formed by forming slits on both sides at the upper end of the slide tube 8 to have elasticity inside and outside are retained and temporarily attached, as shown in FIG. The vertical groove 13 and the vertical groove 14 of the slide tube 8 are substantially aligned with each other, and in this state, the pipe 9 is inserted into the slide tube 8 and the mounting holes formed in the pipe 9 in the vertical grooves 13 and 14. The stopper members 15 are fixed to the pipe 9 by using the mounting holes 21 so as to face the parts 21 and 21. As shown in FIG. 4, the stopper member 15 protruding from the pipe 9 is slidable in the vertical grooves 13 and 14,
The vertical grooves 13 and 14 slide on the stopper member 15 when the backrest portion 2 moves downward.

Here, the stopper member 15 is provided at a position where the stopper member 15 rests against the lower end of the vertical groove 13 of the casing 7 when the backrest portion 2 is in the uppermost position and in a stationary state, so that the stopper member 15 is removed from the pipe 9. 7 or the slide tube 8 is completely prevented from coming out upward, and the vertical groove 1
By the stopper members 15 slidingly contacting the both side edges of the casings 3 and 14, the casing 7, the slide pipe 8 and the pipe 9 can be accurately positioned in the circumferential direction during assembly.

Further, as shown in FIG. 5, the stopper member 15 is provided at a circumferential position (in the drawing, the mounting hole 2).
1, 21)) and the inward elastic piece 16 of the slide tube 8 is slidably contacted with the outer peripheral surface position of the pipe 9 on the opposite side, and both sides are sandwiched by the circumferential position where the inward elastic piece 16 is provided. The mounting positions of the slide tube 8 and the pipe 9 with respect to the casing 7 are set so that the two outward elastic pieces 17, 17 of the spring receiving member 10 are slidably contacted at the position deviated to. Here, the two outward elastic pieces 17, 17 of the spring receiving member 10 are provided at a position with a central angle of 90 degrees.

The stopper member 15 is the pipe 9
A core material 15A that is directly fixed to the core is molded with a high-strength synthetic resin such as nylon (PA), and a soft rubber material 15B such as polyurethane rubber is fitted to the outer peripheral portion in a state of protruding in the upper and lower parts. Yes, the core material 15A is the vertical groove 13
The rubber material 15B is in sliding contact with the vertical grooves 13 and 14, and the rubber material 15B abuts against the lower ends or the upper ends of the vertical grooves 13 and 14.

The upper end surface 11 inside the casing 7
A rubber buffer plate 22 made of rubber such as NBR is disposed on the buffer pipe 22 and is held by the upper end of the slide tube 8. When the backrest portion 2 slides and moves to the lowest position, the buffer plate 22 receives the spring receiving member. The upper end of 10 is stopped so as to prevent the generation of impact noise and reduce the discomfort caused by impact.

The spring receiving member 10 is formed of a synthetic resin having a particularly high strength such as acetal resin (POM) which is a kind of engineering plastic, and has an upper portion for accommodating the compressed coil spring 12 therein. A main body 24 having an open recess 23, and the main body 2
A flange 25 is provided so as to project from the outer periphery of the upper end of the pipe 4, and when the main body 24 is fitted into the upper end of the pipe 9, the flange 25 is fixedly attached to the upper end of the pipe 9. Further, the mounting position of the spring receiving member 10 with respect to the pipe 9 in the circumferential direction is determined by the main body 2
The outward elastic pieces 17, 17 extending outward from the bottom surface of the pipe 4 and projecting from the peripheral wall of the main body 24 are the openings 1 of the pipe 9.
Determined by engaging within 8,18. still,
When the spring receiving member 10 is fitted in the pipe 9, the outward elastic piece 17 partially projects from the opening 18. The lower end of the compression coil spring 12 has the spring receiving member 10
Supported by the bottom surface of the recess 23, the backrest 2 is displaced to the lowest position as shown in FIG. 3, and the compression coil spring 12 is compressed most, the entire compression coil spring 12 is accommodated in the recess 23. To be done.

The slide tube 8 is formed of a synthetic resin having a particularly high strength such as acetal resin (POM), and has a slide hole 26 vertically penetrating therethrough as shown in FIGS. On the inner peripheral surface of the slide hole 26, a plurality of axially extending recesses 27, ... Are provided at predetermined intervals, so that the pipe 9 inserted into the slide hole 26 can be smoothly moved. I am trying. here,
The outward elastic pieces 17, 17 of the spring receiving member 10 are adapted to be in sliding contact with the inner peripheral surface other than the concave line 27. In addition, according to the inner shape of the casing 7 of the backrest portion 2, the outer periphery of the slide tube 8 can be fitted without rattling, and the slide tube 8 does not rotate with respect to the casing 7. A plurality of ribs 28 are provided so as to project in the axial direction, and the backrest support portion 5 of the frame 1 is provided at the lower end portion.
A fitting portion 29 for fitting a bellows (not shown) that covers the outer circumference is provided around the fitting.

Finally, the elastic joint mechanism 3 will be briefly described with reference to FIGS. 2 and 11. The elastic joint mechanism 3 includes a lower joint member 30, an upper joint member 31, and an elastic biasing means 32 that elastically attracts them. The lower joint member 30 is fitted into the backrest support portion 5 of the frame 1 and fixed at a predetermined position by a pin 33 or the like. Further, the upper joint member 31 is fitted in the lower end of the pipe 9 and caulks and fixes a part of the pipe 9. The elastic biasing means 32 has a lower end tiltably locked inside the lower joint member 30, a connecting rod 34 penetrating the upper joint member 31, and a spring retainer plate attached to the upper end of the connecting rod 34. 35, and a compression coil spring 36 wound around the connecting rod 34 between the spring pressing plate 35 and the upper joint member 31. The lower end of the connecting rod 34 has a hemispherical sliding portion 34.
A is formed, a screw 34B is cut on the upper portion, and a nut 34C for holding the spring pressing plate 35 is screwed.

An annular groove 37 having a semicircular cross section is formed on the outer peripheral portion of the upper surface of the lower joint member 30, and an annular ridge having a semicircular cross section is formed on the outer peripheral portion of the lower surface of the upper joint member 31. 38, and in a normal state, the annular groove 37 and the annular protrusion 38 are strongly engaged by the elastic force of the compression coil spring 36. Then, when a seated person leans against the backrest 2, the upper joint member 31 resists the elastic force of the compression coil spring 36 through the pipe 9, and the rear portion of the annular groove 37 and the annular protrusion 38 is used as a fulcrum. Is inclined rearward with respect to the lower joint member 30, that is, the backrest support portion 5 of the frame 1. When tilting, the sliding portion 3 of the connecting rod 34
4A slides on the reduced diameter portion 30A of the lower joint member 30, and the fulcrum is located inside thereof, so that the compression coil spring 36 is compressed, and the spring pressing plate 35
Moves inside the pipe 9 toward the upper joint member 31 side,
Since the stop pipe 39 provided on the outer circumference of the compression coil spring 36 stops the upper joint member 31 and the spring retainer plate 35 to limit the distance therebetween, the inclination angle thereof is limited.

In the chair according to the present invention, when a seated person leans on the backrest portion 2 and takes a reclining posture, the backrest portion 2 tilts backward and the seat portion B moves forward, and at the same time, the backrest portion 2 moves. Elastically sinks downward to support the lumbosacral spine in an optimal position and to prevent pulling and wrinkling of clothes.

[0026]

According to the chair backrest slide device of the present invention as described above, the following remarkable effects are exhibited.

According to the first aspect, the up and down sliding movement of the backrest can be performed more smoothly without rattling, and
After mounting the backrest slide mechanism, it does not disassemble even if the backrest is lifted.

According to claim 2, the upper end of the pipe and the casing
The distance between the upper end surface of the ring and the
Contributes to downsizing of the coil and stabilizes the compression coil spring.
And can hold.

According to claim 3, positioning of the casing, the slide tube and the pipe in the circumferential direction at the time of assembly,
It is possible to prevent the backrest part from unexpectedly coming out upward.

According to the fourth aspect of the present invention, when the backrest portion is slid and moved to the lowermost position, the upper end of the spring receiving member abuts against the buffer plate, and it is possible to reduce the generation of impact noise and the discomfort caused by the impact. .

[0031]

[Brief description of drawings]

FIG. 1 is an overall perspective view of a chair according to the present invention.

FIG. 2 is a vertical sectional view showing a main part of the present invention.

FIG. 3 is a vertical cross-sectional view showing a state in which the backrest portion is also slid downwardly.

FIG. 4 is a partial front view showing the relationship between the vertical groove and the stopper member in the assembled state.

FIG. 5 is an abbreviated exploded perspective view showing an essential part of the present invention.

FIG. 6 is a rear view of the slide tube.

FIG. 7 is a side view of the slide tube.

FIG. 8 is a plan view of the slide tube of the same.

9 is a sectional view taken along line XX of FIG.

FIG. 10 is a vertical cross-sectional view of a slide tube.

FIG. 11 is a partial vertical cross-sectional view showing a tilted state of the elastic joint mechanism.

[Explanation of symbols]

A leg B seat 1 frame 2 backrest 3 Elastic joint mechanism 4 Backrest slide device 5 Backrest support part 6 Joint part 7 Casing 8 Slide tube 9 Pipe 10 Spring receiving member 11 Upper end surface 12 Compression coil spring 13 vertical groove 14 vertical groove 15 Stopper member 16 Inward elastic piece 17 outward elastic piece 18 opening 19 Engagement hole 20 Engagement claw 21 Mounting hole 22 Buffer plate 23 recess 24 main body 25 Collar 26 Slide hole 27 concave line 28 rib 29 Fitting part 30 Lower joint member 31 Upper Joint Member 32 Elastic Biasing Means 33 pin 34 connecting rod 35 spring retainer plate 36 compression coil spring 37 annular groove 38 annular projection 39 stop pipes

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) A47C 7/44 A47C 3/025

Claims (4)

(57) [Claims] 1. A backrest support portion of both side frames attached to a leg portion is provided between the backrest portion via an elastic joint mechanism capable of tilting the backrest portion back and forth, and the backrest portion is provided. A backrest slide device for a chair, which is elastically slidable toward a joint part of an elastic joint mechanism, wherein a tubular casing having an upper end closed and a lower open end is formed on both sides of the backrest part, and the inside of the casing is formed. A synthetic resin slide tube is inserted into the slide tube, a metal pipe extending upward from the joint is slidably inserted into the slide tube, and a synthetic resin spring receiving member attached to the upper end of the pipe. A compression coil spring is interposed between the casing and the upper end surface inside the casing, and a stopper member protruding from the pipe is slidably arranged in a vertical groove penetrating the casing and the slide pipe. At the same time, an inward elastic piece integrally formed at the lower end of the slide tube is protruded from the stopper member.
The outer peripheral surface position of the pipe on the side opposite to the installed circumferential position
Slidably pressed against the location, integrally formed of the spring receiving member
Are two outward formed by slidably in pressure contact with the inner peripheral surface of the slide tube through the opening formed in the pipe from the inside
The elastic piece between the circumferential position where the inward elastic piece is provided.
A backrest slide device for a chair that slides on both sides . 2. A backrest of both side frames attached to the legs.
Elastic joint machine that allows the backrest to tilt forward and backward on the support
It is installed between the backrest part and the backrest part through the structure.
The elastic slide can be moved toward the joint of the sex joint mechanism.
A backrest slide device for a chair, on both sides of the backrest part.
A tubular casing with the top closed and the bottom open
And a synthetic resin slide inside the casing.
Insert the tube into the metal part and extend upward from the joint.
Insert the slide into the slide tube.
A spring holder made of synthetic resin attached to the upper end of the pipe
A compression coil between the member and the upper end surface inside the casing
A spring is inserted, and the casing and slide tube are penetrated
A stopper member protruding from the pipe in the vertical groove
It is slidably arranged and the lower end of the slide tube
Slide the inward elastic piece integrally formed on the outer peripheral surface of the pipe.
An outer member that is movably pressed and integrally formed with the spring receiving member.
Orient the elastic piece through the opening formed in the pipe from the inside
It is slidably pressed against the inner peripheral surface of the slide tube.
In addition, the spring receiving member is a compression coil in a compressed state inside.
A recess having an upper opening for accommodating the spring, the bottom of the recess
A backrest slide device for a chair, which supports one end of the compression coil spring . 3. The stopper member is provided at a position where the stopper member comes in contact with the lower end of the vertical groove of the casing when the backrest portion is in the uppermost position and is in a stationary state, and the stopper member of the casing, the slide pipe, and the pipe at the time of assembly is mounted. backrest slide device according to claim 1 or 2, wherein the chair formed by the positioning of the circumferential direction. 4. A buffer plate is disposed on an upper end surface inside the casing, and the upper end of the spring receiving member is abutted against the buffer plate when the backrest portion slides and shifts to the lowest position. Item 5. A chair back slide device according to any one of items 1 to 3 .