JP4667585B2 - Reclining chair tilt fixing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reclining chair, and more particularly to an inclination fixing device for a reclining chair for locking a seat back at an arbitrary desired position by tilting the backrest backward.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a reclining chair has been provided in which a backrest can be tilted to take an easy posture in an office chair.
[0003]
As the fixing means for tilting the backrest backward and fixing it at any desired tilt angle position, a conventional gas spring is used, and this gas spring is locked at an arbitrary tilt position by operating a lever, or a multi-plate type There is a clutch plate that is locked by pressing the clutch plate at an arbitrary tilt position.
[0004]
[Problems to be solved by the invention]
However, the fixing means using the gas spring has a problem in that the durability (gas escape) of the gas spring itself is limited and expensive, and the cost of the reclining chair is affected.
[0005]
In the case of a multi-plate type clutch plate, the manufacturing process including the assembly process is complicated due to the large number of parts, and because it is fixed by friction, the number of clutch plates must be increased to obtain a strong fixing force. There is a problem that the number of parts is increased more and more, and in order to increase the pressure contact force of the clutch plate, a large force is required for the operation force and the operation becomes difficult.
[0006]
The present invention has been made to solve the above-described problems of the prior art, and can be configured compactly with a small number of parts, while being able to obtain a large fixing force with a light operating force and a low cost burden. It is an object of the present invention to provide an inclination fixing device for a reclining chair that can be suppressed and does not cause a failure.
[0007]
[Means for Solving the Problems]
As a means for solving the above-mentioned problems, the present invention provides a reclining chair comprising a cradle supported by legs and a back frame that is pivotally supported by the cradle and is tiltable rearward to form a backrest. A long hole through which a shaft on the seat portion supported by the base is swingably supported, and a tooth row which is engraved at a predetermined pitch in a direction perpendicular to the long hole. And a meshing member having teeth meshing with a tooth row of the slide guide, and the meshing member can be meshed or disengaged with the tooth row of the slide guide by rotating the operation member. The back frame is sometimes fixed to the cradle.
[0008]
The means for moving the meshing member to the meshing / non-meshing position of the slide guide to the tooth row includes a compression spring having one end supported on the guide shaft side and the other end engaged with the meshing member, and the operating member. And a cam mechanism that presses the meshing member by rotating the cam member. When the meshing member is unloaded, the meshing is released and the back frame can be tilted backward, and the cam mechanism is rotated when the operating member rotates. Therefore, it is preferable that the meshing member is engaged and locked at the position when the meshing member is pushed.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to embodiments shown in the drawings.
FIG. 1 shows a cross-sectional view of a main part of an embodiment of a reclining chair incorporating a tilt fixing device according to the present invention, FIG. 2 shows a plan view with the seat cushion of FIG. 1 removed, and FIG. It shows the state of the hour.
[0010]
The reclining chair 1 includes a seat portion 6 in which a seat cushion 5 is attached to a seat frame 4 provided on a pedestal 3 supported by a pedestal 2, and a back pivotally supported by the pedestal 3 so as to tilt backward. A back cushion 8a is attached to the upper portion of the back frame 7 to form a backrest 8. A gas spring (for adjusting the height of the seat portion 6) is provided in the pedestal 2 as in the conventional case. (Not shown).
[0011]
The back frame 7 has an L shape in a side view, and the front end of a lower frame 7a extending toward the front of the lower portion is supported by a shaft 9 at a position forward of the leg 2 of the cradle 3 so as to be swingable in the vertical direction. The shaft 9 is wound with a pair of left and right coil springs 10, 10, and one ends 10 a, 10 a of the coil springs 10, 10 are spanned between the left and right lower frames 7 a, 7 a of the back frame 7 and fixed. The other ends 10 b and 10 b are locked to the lower surface of the spring receiver 13 that moves in the vertical direction by the rotation of the adjustment screw 12 screwed into the lower surface of the front portion of the cradle 3. ing. As a result, when the backrest 8 is tilted backward, the coil springs 10 and 10 are tightened to obtain a reaction force, and the adjustment screw 12 is rotated to move the spring receiver 13 to adjust the strength of the reaction force. can do.
[0012]
Further, brackets 15 having long holes 14 inclined downward toward the rear are provided on the left and right portions of the front end of the cradle 3. The long holes 14 have shafts 16 fixed in the width direction near the front end of the seat frame 4. Is inserted, and the seat frame 4 can slide forward by the length of the long hole 14 through the shaft 16.
[0013]
An inclination fixing device 17 according to the present invention is provided at a central portion of the cradle 3 slightly forward of the pedestal 2.
[0014]
The tilt fixing device 17 includes a slide guide 20 in which a bearing portion 18 at one end is pivotally supported on a cradle 3 by a shaft 19 so as to be swingable in a vertical direction, an engagement member 21, a cam mechanism 22, and an operation member 23. It is configured.
[0015]
The slide guide 20 has a rectangular shape in side view as shown in an enlarged view in FIGS. 5 and 6, and a long hole 24 is formed at the center in the longitudinal direction, and the long hole 24 is formed on both side surfaces thereof. A tooth row 25 is formed which is carved with a predetermined pitch in a direction orthogonal to the above. In addition, an edge portion 26 is provided so as to protrude from the four sides of the side surface on which the tooth row 25 is formed.
[0016]
A guide shaft 28 supported by the left and right bearing portions 27, 27 of the seat frame 4 is inserted into the long hole 24, and the positional relationship between the guide shaft 28 and the long hole 24 is determined by the back frame 7. The guide shaft 28 is positioned at the upper end of the long hole 24 (shown in FIG. 1) when it is most up (when not reclining), and the guide shaft 28 is at the lower end of the long hole 24 when the back frame 7 is tilted most backward. A position (shown in FIG. 4) is set, and at an intermediate inclination, the position is set according to the inclination (shown in FIG. 3).
[0017]
The engagement member 21 is provided as a pair so as to sandwich the side surface of the slide guide 20. The engagement member 21 is slidably fitted into the guide shaft 28, and the teeth facing the tooth row 25 of the slide guide 20 The row 25 has teeth 29 which can be engaged with each other, and the surface side having the teeth 29 is located in the edge portion 26 of the side surface of the slide guide 20 so as not to deviate from the surface side.
[0018]
The moving means for engaging or disengaging the teeth 29 of the engagement member 21 with the tooth row 25 of the slide guide 20 has one end supported by a spring receiver 30 fixed to the guide shaft 28 and the other end of the engagement member 21. A compression spring 31 engaged in the recess and a cam mechanism 22 that pushes the engagement member 21 against the compression spring 31 by rotating the operation member 23 in the vertical direction.
[0019]
The operation member 23 is composed of a pair of pieces 23A and 23B as shown in FIG. 7 with the phase reversed by 90 ° for convenience, and the tips of the pieces 23A and 23B are on the outer end surfaces of the engagement members 21 and 21, respectively. The guide shaft 28 is rotatably fitted to the guide shaft 28, and the base ends of the pieces 23 </ b> A and 23 </ b> B are made slidable by fitting the protrusion 32 and the recess 33. It can be followed for the movement of.
[0020]
Convex cams 34, 34 are formed on the outer surfaces of the distal ends of the pieces 23 A, 23 B. The cams 28 abut on fixed guides 35, 35 fixed to the guide shaft 28 to rotate the operation member 23. When the convex cams 34, 34 ride on the heights 35 a, 35 a of the fixed cams 35, 35, the engagement members 21, 21 are pushed against the compression spring 31 and the teeth 29 are inserted into the tooth row 25 of the slide guide 20. (FIG. 7 (A)), and when the convex cams 34, 34 fall into the lower portions 35b, 35b of the fixed cams 35, 35, the meshing members 21, 21 are pushed back by the compression spring 31, and the teeth 29 are toothed. 25 (FIG. 7B).
[0021]
In FIG. 2, reference numeral 36 denotes an operation lever that is coupled to the operation member 23 and can be operated on the side portion of the seat portion 6.
[0022]
Next, the operation of the above embodiment will be described.
In the state where the backrest 8 of FIG. 1 is raised, the guide shaft 28 of the seat frame 4 is located at the upper end of the long hole 24 of the slide guide 20, and at this position, the teeth 29 of the meshing member 21 are located on the slide guide 20. At this position, the slide guide 20 is engaged with the tooth row 25, and the back frame 7 is locked so as not to tilt backward. At this time, the cushioning property when leaning against the backrest 8 is given by the reaction force of the coil springs 10 and 10.
[0023]
When it is desired to tilt the backrest 8 back to the reclining posture from the state of FIG. 1, when the operation member 23 is rotated by operating the operation lever 36, the convex cam 34 of the operation member 23 is lowered at the lower portion 35 b of the fixed cam 35. The engagement member 21 is released from the back of the engagement member 21 so that the engagement member 21 slides on the guide shaft 28 together with the pieces 23A and 23B of the operation member 23 by the urging force of the compression spring 31 and moves away from the slide guide 20. The teeth 29 are completely detached from the tooth row 25 of the slide guide 20 (the state shown in FIG. 7B).
[0024]
As a result, the back frame 7 is brought into a free state, and the back frame 7 is tilted backward so that the backrest 8 has an optimum inclination. After that, if the operation lever 36 is operated to return to the original position when the tilt angle becomes optimum, the operation members 21 and 21 rotate in the opposite direction, and the convex cam 34 rides on the height 35a of the fixed cam 35. As a result, the back portions of the meshing members 21 and 21 are pressed to move forward against the bias of the compression spring 31, and the teeth 29 mesh with the tooth rows 25 of the slide guide 20 to restrain the slide guide 20. As a result, the back frame 7 is locked in the reclining posture with the optimum rearward tilt angle, and the seat portion 6 interlocked with the back frame 7 takes a position corresponding thereto (shown in FIG. 3).
[0025]
FIG. 4 shows a state in which the backrest 8 is tilted rearward as much as possible. In this state, the guide shaft 28 is positioned and locked at the lower end of the long hole 24 of the slide guide 20. And the seat part 6 is also fixed to the last inclination position, and makes it easy to take a reclining posture.
[0026]
In any of the above postures, since the tooth row 25 of the slide guide 20 and the teeth 29 of the engagement member 21 are engaged with each other unless the operation member 22 is operated, the backrest 8 may incline backward carelessly. Absent.
[0027]
Further, a rearward tilt angle (reclining angle) is obtained in a stepless manner according to the pitch of the tooth row 25.
[0028]
In the illustrated embodiment, the tooth guide 25 is provided on both surfaces of the slide guide 20 and a pair of engaging members 21 and 21 are provided. However, depending on the purpose of use of the reclining chair, the slide guide 20 is shown. It is also possible to provide the tooth row 25 only on one side surface, and the meshing member 21 and the cam mechanism 22 for moving this back and forth can be provided on only one side.
[0029]
【The invention's effect】
As described above, according to the present invention, the number of parts can be remarkably reduced as compared with the conventional multi-plate friction clutch, and it is compact because it is not dependent on the frictional force and is engaged with the teeth row and teeth when locked. With a simple structure, it is possible to exert a strong holding force, and it is only necessary to rotate the operation member for operation, so there is no need for a large operation force, it is excellent in durability, and it has a low cost burden. be able to.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part when a backrest of an embodiment of a reclining chair provided with a tilt fixing device according to the present invention is raised.
FIG. 2 is a plan view of the main part from which the seat cushion is removed.
3 is a view corresponding to FIG. 1 in a state where the backrest is slightly tilted backward.
FIG. 4 is a view corresponding to FIG. 1 when the backrest is tilted last.
FIG. 5 is a front view of a slide guide according to the present invention.
6 is a front view showing the relationship between the slide guide and the meshing member in FIG. 5;
FIGS. 7A and 7B are diagrams illustrating an operation of the tilt fixing device according to the present invention, in which FIG. 7A is a cross-sectional view of a lower half portion showing a state when locked, and FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Reclining chair 2 Pillar 3 Stand 4 Seat frame 6 Seat 7 Back frame 8 Back cushion 10 Coil spring 17 Inclination fixing device 20 Slide guide 21 Engagement member 22 Cam mechanism 23 Operation member 25 Teeth row 26 Edge portion 28 Guide shaft 29 Teeth 34 Convex cam 35 Fixed cam

Claims (2)

A reclining chair comprising a pedestal supported by a leg and a back frame that is pivotally supported by the pedestal so as to be tilted rearward and constitutes a backrest. A slide guide having a long hole through which the seat side guide shaft supported on the table is inserted, and a tooth row formed on the side surface at a predetermined pitch in a direction perpendicular to the long hole; A meshing member having teeth meshing with the tooth row, and the meshing member can be meshed or non-meshable with the tooth row of the slide guide by rotating the operation member, and the back frame is fixed to the cradle when meshing. An inclination fixing device for a reclining chair, characterized in that The means for moving the meshing member to the meshing / non-meshing position of the slide guide to the tooth row includes a compression spring having one end supported on the guide shaft side and the other end engaged with the meshing member, and the operating member. And a cam mechanism that presses the meshing member when the meshing member is rotated. When the meshing member is not loaded, the meshing is released and the back frame can be tilted backward. The tilt fixing device for a reclining chair according to claim 1, wherein when the member is pushed, it is engaged and locked at that position.

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