JP2010158441A - Chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chair achieving a back locking angle adjusting function and a back locking function through a compact configuration. <P>SOLUTION: In the chair in which a back frame 31 supporting the back can be tilted around a supporting shaft 60 to which the back frame is attached within a prescribed operation range, angle link members 91 and 92 extending from the supporting shaft 60 in the radial direction are provided around the supporting shaft 60 so as to be linked with the tilt of the back frame 31. The chair is provided with angle regulation members 93 and 94 which can be brought close to or separated from the angle link members 91 and 92 and regulate a part of the operation of the angle link members 91 and 92 by selectively associating with a part of the angle link members 91 and 92. By the engagement between the angle regulation members 93 and 94 and the angle link members 91 and 92, the operation of the back is regulated. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a chair that simply has a back locking angle adjustment function, a locking function, and the like.

As an apparatus for adjusting the rocking angle of the back, for example, the one shown in Patent Document 1 is known.
In this case, the back frame is attached to the support base fixed to the upper end of the pedestal by pivoting the front end bent from the lower part of the back frame that supports the backrest with the rotation shaft facing in the left-right direction. In a synchro-rocking type chair that can be tilted rearward and downward against a spring, the support base is linked to the back frame, and in conjunction with the rotation of the back frame in the front-rear direction, the front-rear direction with respect to the support base An angle-regulating member that can be moved in the front-rear direction to determine the front limit and rear limit in the synchro-rocking operation, before and after the interlocking member on the support base. (Movable block body) is provided, and an operation means for adjusting the front and rear positions of the front and rear angle regulating members is provided, and the front and rear direction movement range of the interlocking member is adjusted by the operation means. The tilt range of the backrest rod, and is configured so that the user can actually leaning on the back to adjust only by operating at a desired angle.

  The pair of angle restricting members have slopes, and the slopes are brought into contact with the slopes of the fixed block bodies having slopes arranged on the outer sides of both block bodies, and are moved along the slopes. It is comprised so that the front-back position of a control member can be changed.

JP 2001-128774 A

  However, if the interlocking member slides in this way, and the angle regulating member also slides, a large space is required in the support base along the sliding direction, and a large-sized guide portion is required to stabilize the sliding operation. There is a problem that it becomes necessary.

  In particular, in order to restrict both the back-back tilting operation and the standing-up operation, the document disclosed in this document arranges a pair of fixed block bodies having inclined surfaces at the front and rear separated positions of the support base, and these fixed blocks. Further, a pair of angle restricting members having slopes are further arranged inside to form a gap for moving the axial tilt range adjusting member between the front and rear angle restricting members. The structure has to be brought in.

  In addition, the above-mentioned patent document has a structure that restricts the back tilting operation by restraining a part of the synchroking operation in which the rear end side of the seat sinks in conjunction with the back tilting of the back. It cannot be applied to a chair that does not employ a structure and tilts only in the back.

  The present invention has been made paying attention to such a problem, and is to provide a chair that can effectively realize a back locking angle adjustment function, a back locking function, and the like through a compact configuration. It is an object.

In order to achieve this object, the present invention takes the following measures.
That is, the chair according to the present invention is an angle interlocking member that extends in a radial direction from the support shaft in which the back frame that supports the back is tiltable around the support shaft to which the back frame is attached within a predetermined operating range. Is provided around the support shaft so as to be interlocked with the tilting of the back frame, and can be contacted / separated with respect to the angle interlocking member, and selectively engaged with a part of the angle interlocking member, thereby the angle interlocking member. An angle restricting member for restricting a part of the operation is provided, and the back action can be restricted by engaging the angle restricting member with the angle interlocking member.

  As described above, if the angle interlocking member extending in the radial direction from the support shaft is rotated in conjunction with the back around the support shaft, and the angle control member is associated with the angle interlocking member, the rotation is controlled. Since at least the angle interlocking member of the angle interlocking member and the angle regulating member can be configured compactly around the support shaft, the increase in the space in the sliding direction can be effectively suppressed as compared with the case where both members slide together. be able to. Further, since the rotation of the angle interlocking member is restricted within the rotation surface of the support shaft, it is easy to make the configuration in the direction along the support shaft compact. Further, since the operation of the angle interlocking member is stably performed by the rotation operation around the support shaft, it contributes not only to the stabilization of the entire operation but also to the simplification of peripheral elements such as the guide mechanism. Furthermore, since the back frame is directly regulated via the support shaft, the back angle adjustment function can be effectively introduced even for a chair that does not have a synchro lock structure.

  The restriction in the above is not limited to the adjustment of the locking angle, but may be a simple back lock or the like.

  In order to more effectively suppress the bulk in the direction along the support shaft, it is desirable that the angle regulating member is arranged in parallel to the angle interlocking member.

  As a form of a member for achieving compactness, it is effective to employ a plane-shaped member for both the angle interlocking member and the angle regulating member.

  In this case, in order to obtain a more flat and stable and reliable regulating force, it is effective that the angle interlocking member and the angle regulating member having a planar shape are in a relationship in which they are engaged within the thickness at the outer periphery thereof. It is.

  When it is necessary to regulate the back movement in both the backward tilting direction and the standing direction, in order to achieve a further compactness, at least two angle regulating members are connected to and separated from the angle interlocking member from the same direction. It is desirable to be configured to be individually engaged.

  In order to achieve further compactness and stable operation, the angle regulating member is attached via an axis parallel to the support shaft, and can be rotated synchronously while being engaged with the angle interlocking member. Thus, it is effective that the angle restricting member and the angle interlocking member have a fan shape or a sickle shape in which engagement elements such as teeth and friction surfaces necessary for synchronous rotation are formed only in a required region on the outer periphery.

  In order to give a contact / separation operation with a simple structure and to keep the operation space in a narrow range as much as possible, the angle interlocking member and the angle restricting member have a gear portion, and the angle restricting member is interposed via an axis parallel to the support shaft. It is desirable that the angle restricting member is selectively engaged with the angle interlocking member via the gear portion by attaching and separating the shaft with respect to the support shaft.

When the support base that supports the back seat is constructed by laying the support shaft between a pair of side walls, the angle interlocking member and the angle regulating member may be arranged so as to be biased toward one side wall. It is valid.
Specifically, a reaction force mechanism that applies a reaction force to the rotation of the back frame around the support shaft and an angle restriction member that restricts the rotation of the back frame around the support shaft include a support shaft. It is effective to configure so as to extend in parallel in the crossing direction.

  In particular, it has a free shaft parallel to the support shaft at a portion displaced from the support shaft, and when the back frame rotates around the support shaft, this free shaft is driven to interlock the angle interlocking member and the reaction force mechanism. It can be a rational configuration to drive the reaction force transmission unit for transmitting the reaction force.

According to the present invention described above, the function of regulating the locking range of the back or locking the back to the required tilting position is configured so that stable operation can be performed without using a large structure. Can do. Therefore, it is possible to provide a chair that can effectively reduce the number of parts of the mechanical parts related to the tilting of the back and improve the space factor related to the parts incorporation around the support base that supports the back seat.

The side view of the chair which concerns on one Embodiment of this invention. The partial exploded perspective view of the support base periphery of the chair. The top view of the support base periphery of the chair. The disassembled perspective view of the main reaction force mechanism which comprises the chair. AA line sectional view in FIG. Action explanatory drawing corresponding to FIG. Action | operation explanatory drawing of a main reaction force mechanism. The top view corresponding to FIG. 3 after reaction force adjustment. The disassembled perspective view of a reaction force adjustment part. Action | operation explanatory drawing of a reaction force adjustment part. The exploded view around the seat of the chair. The side view which shows the state of the chair at the time of standing up. The side view which shows the state of the chair at the time of normal specification. The side view which shows the state of the chair in rocking. The side view which shows the state of the chair in rocking. The side view which shows the state of the chair in rocking. Action | operation explanatory drawing which shows rocking operation | movement. Explanatory drawing which shows the effect | action of the main reaction force mechanism and auxiliary reaction force mechanism which comprise the chair. The disassembled perspective view which shows the angle adjustment apparatus which comprises the chair. Action | operation explanatory drawing of the angle adjustment apparatus which controls the backward tilting movement of a chair. Action | operation explanatory drawing of a back inclination side angle adjustment member. Action | operation explanatory drawing of a standing side angle adjustment member. The perspective view which shows the support structure of a back.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the chair of this embodiment includes a support base 2 supported by the legs 1, a back 3 attached to the support base 2 via a back frame 31 so as to be tiltable, and the back 3 The swivel chair includes a main reaction force mechanism 4 (see FIG. 2) that supports a load, and a seat 5 that is supported by the support base 2 and the back frame 31.

  More specifically, the leg 1 is a leg 12 that protrudes from a center of a leg blade 11 having a caster 11a at its lower end so that it can be moved up and down by a gas spring (not shown). It is attached so that it can rotate.

  As shown in FIG. 2, the support base 2 is formed of a rigid body such as an aluminum die cast, and includes a bottom wall 21 and side walls 22 located on both sides of the bottom wall 21. The supporting shaft 60 for attaching the frame 31 and the links 50a, 55a for supporting the seat 5 are provided, and the reaction force of the main reaction force mechanism 4 and the main reaction force mechanism 4 is adjusted inside. The reaction force adjusting unit 7 and the like are incorporated.

  2 and 3, the main reaction force mechanism 4 is an elastic member having a base end 41a attached to the bottom wall 21 of the support base 2 via a shaft 4a and a tip 41b set as a compression force input end. A compression spring 41 and a base end 42a are rotatably attached to the bottom wall 21 of the support base 2 via a shaft 4b serving as a fulcrum, and a tip 42b is a shaft serving as a connecting portion to the compression force input end 41b of the compression spring 41. 4c, and a rotating arm 42 is applied to the rotating arm 42 so that the rotating arm 42 rotates around the fulcrum 4b and compresses the compression spring 41. It has become. A flat pressure receiving surface 42c extending substantially linearly is formed on the side surface between the base end 42a and the tip end 42b of the rotary arm 42.

  On the other hand, in order to allow the main reaction force mechanism 4 to support the load of the back 3, as shown in FIGS. 3 to 5, as shown in FIGS. A free shaft 63 (see FIG. 1) is attached to a portion displaced from the support shaft 60 that supports the base end of the back frame 31 so as to be freely movable along with the rotation of the back frame 31 around the support shaft 60. The idle shaft 63 is attached to a portion displaced from the support shaft 60 of the backward tilt interlocking member 6 so that the backward tilt interlocking member 6 rotates in conjunction with the tilting operation of the back frame 31. Specifically, the backward tilt interlocking member 6 penetrates the support shaft 60 between the pair of opposing walls 61a, 61a of the channel-shaped bracket 61, and the pair of opposing walls 61a, The floating shaft 63 is penetrated between 61a. The floating shaft 63 is located below the support shaft 60, but is free to move between the position of FIG. 5 and the position of FIG. 6 without interfering with the bottom wall 21 and the side wall 22 of the support base 2. It is possible. Needless to say, the backward tilt interlocking member 6 is interlocked with the rotation of the support shaft 60 not only when tilting backward but also when standing.

  And the reaction force transmission part 64 is provided in a part of this backward tilt interlocking member 6. As shown in FIG. 4 and the like, the reaction force transmitting portion 64 includes a swinging bracket 64a attached between the opposing walls 61a and 61a of the bracket 61 constituting the backward tilt interlocking member 6 via the floating shaft 63, and The swinging bracket 64a is composed of a roller 64c attached via a pin 64b. When the idle shaft 63 is moved between the position shown in FIG. 5 and the position shown in FIG. The reaction force transmission portion 64 is configured to advance and retract toward the pressure receiving surface 42c of the rotary arm 42. That is, as the reaction force transmission unit 64 rotates, the roller 64c of the reaction force transmission unit 64 and the rotation arm 42 come into contact with each other, and the reaction force transmission unit 64 further moves in a direction in which the rotation arm 42 rotates. As shown in FIG. 7, the rotating arm 42 compresses the compression spring 41 to increase the reaction force. For this reason, the crossing angle θ formed by the extending direction m1 of the rotary arm 42 and the operation center m2 of the compression spring 41 changes as the rotary arm 42 rotates with the locking of the spine 3. In this embodiment, the locking described later is performed. The crossing angle θ is set to be maximum (substantially perpendicular) at the end position (backward tilt position of 30 °).

  In addition, the reaction force adjusting unit 7 changes the position of the roller 64c of the reaction force transmitting unit 64 along the pressure receiving surface 42c of the rotating arm 42 as shown in FIG. 3 to FIG. As shown in FIG. 9 and the like, an operation shaft 71 that is a reaction force operation element provided with a grip 71a, and a direction orthogonal to the axis of the support shaft 60 as the operation shaft 71 rotates (the arrow in FIG. 9). The advancing / retreating member 72 that is a displacement member that moves along the side wall 22 in the direction) and the operation of the advancing / retreating member 72 in the direction orthogonal to the backward-tilting interlocking member 6 And an operation conversion unit 73 for converting the operation.

  A pinion 71b is attached to the operation shaft 71 at the tip, and a bearing portion 70a of a bracket 70 whose inner end is fixed to the support base 2 in a state where the pinion 71b is engaged with a rack 72a provided in a part of the advance / retreat member 72. Is rotatably supported. The advancing / retreating member 72 has a block portion having a triangular shape in plan view in part, and an inclined surface 72c that forms a predetermined angle with respect to the advancing / retreating direction is formed on the inclined surface, as shown in FIG. A wave-like uneven portion 72b close to a sawtooth shape in which the groove 72b2 is repeated is formed. On the other hand, as shown in FIGS. 3 and 9, etc., the support shaft 60 is movable in the direction along the axis of the support shaft 60 at a position adjacent to the one opposing wall 61a of the backward tilt interlocking member 6. An intermediate member 74 that is rotatably passed is attached. The intermediate member 74 is composed of a triangular block in plan view, and has a slope 74c parallel to the slope 72c. On the slope 74c, as shown in FIG. A wave-shaped uneven portion 74b having a shape similar to that of the groove 72b2 and having a sawtooth shape composed of a protrusion 74b1 and a concave groove 74b2 having the same pitch is formed. As shown in FIG. 3 and FIG. 9 and the like, an offset that presses the intermediate member 74 toward the advancing / retracting member 72 by elastically contacting the backward tilting interlocking member 6 on the other opposing wall 61a side of the backward tilting interlocking member 6 The spring 75 is elastically contacted with being wound around the support shaft 60.

  That is, when the advancing / retracting member 72 is moved from the position shown in FIG. 3 to the position shown in FIG. 8, the concavo-convex portion 72b formed on the inclined surface 72c of the advancing / retreating member 72 is engaged with the uneven portion 74b formed on the inclined surface 74c of the intermediate member 74. Since the advancing / retreating member 72 moves relative to the intermediate member 74 while changing at a predetermined pitch, the rearward tilting interlocking member 6 moves along the axis of the support shaft 60 against the spring 75 via the intermediate member 74. Move in the direction. As shown in FIG. 10, the concave and convex portions 72b and 74b constitute a temporary locking portion by fitting one concave portion and the other convex portion, and the relative phase relationship between the advancing / retreating member 72 and the intermediate member 74 has a constant holding force. Hold on. The temporary locking portion has a relationship in which the fitting position cannot be changed unless the advance / retreat member 72 and the intermediate member 74 are once separated in the axial direction of the support shaft 60. Then, the reaction force transmitting portion 64 supported by the backward tilt interlocking member 6 shown in FIGS. 3 and 4 and the like moves to the position of FIG. 6 is rotated as shown in FIG. 5 → FIG. 6, the reaction force transmitting portion 64 and the rotating arm 42 are rotated when the reaction force transmitting portion 64 is pressed against the rotating arm 42 and the rotating arm 42 rotates as shown in FIG. The arm length L of the moment from the contact point to the fulcrum 4b of the rotating arm 42 changes.

  As shown in FIG. 1 and FIG. 11 and the like, the seat 5 cushions a front side member 52 which is an elastically deformable surface side support member made of a resin plate or the like on the upper end side of a resin shell 51. The shell 51 is supported by the seat frame 50 by being attached together with the material 53, the upholstery 54, and the like. The seat frame 50 is supported on the support base 2 via a front link 50a and a back frame 31 which is a rear link under a four-point link structure including fulcrums 5a, 5b, 5c and 5d. As the back 3 is tilted backward, the front side member 52 is operated together with the seat frame 50 so as to sink back as shown in FIG. 12 → FIG. 13 → FIG. 14 → FIG. 15 → FIG. The synchro-rocking mechanism X1 is configured.

  Further, the seat 5 shown in FIGS. 1 and 11 and the like is provided with a cushioning interlocking variable mechanism Y for changing the cushioning property with tilting. The cushioning interlocking variable mechanism Y is provided with a back side material 55 which is a back side support member made of a slightly hard resin plate or the like disposed below the front side material 52. Is provided with flexibility to be deformed downward in accordance with the load of the seat 5, whereas the back side surface material 55 is supported by the pedestal 56 via a coil spring 56a which is an auxiliary elastic material. The pedestal 56 is supported on the support base 2 via a front link 55a and a back frame 31 as a rear link under a four-point link structure including fulcrums 5a, 5e, 5f, and 5d. As the back 3 is tilted backward, the base 56 is actuated to sink backward as shown in FIG. 12 → FIG. 13 → FIG. 14 → FIG. 15 → FIG. is doing. The shell 51 shown in FIG. 11 has a mortar shape having an opening on the lower end side, and in an internal space formed between the shell 51 and the front side material 52 with the front side material 52 attached to the upper surface. The back side surface material 55 can be accommodated so as to be movable up and down.

  In this case, the pedestal 56 and the like are positioned in the cavity of the shell 51 through the inside of the opening 50x of the seat frame 50, and can operate without interfering with the seat frame 50 and the like. Then, as the seat 5 is tilted backward, each of the fulcrums 5e and 5f is set so as to rotate rearward and lower earlier than the fulcrums 5b and 5c, whereby FIG. 12 → FIG. 13 → FIG. 14 → FIG. As shown in FIG. 16, the amount of sinking of the back side surface material 55 by the back surface side synchro rocking mechanism X2 is larger than the amount of sinking of the front surface material 52 by the surface side synchro rocking mechanism X1. In this manner, the relative position of the back side surface material 55 with respect to the front side surface material 52 moves in a direction that continuously separates from the front side surface material 52 in conjunction with the rearward inclination of the back 3, so that the cushioning property of the seat 5 gradually becomes softer. Will change direction.

  A stopper 20 is disposed on the side wall 22 of the support base 2 shown in FIG. 1 and the like to give the back frame 31 the tilt start end position shown in FIG. 12 and the tilt end position shown in FIG. This stopper 20 is made of a triangular plate material, has two sides 20a and 20b as regulating sides, and when the back frame 31 is at the maximum standing position (a −5 ° position described later) shown in FIG. The first restricting portion 31a set at a part of the base end side of the back frame 31 is engaged with the first restricting side 20a of the stopper 20, and the back frame 31 is moved to the maximum tilt position shown in FIG. The second restricting portion 31b set at the other part of the base end side of the back frame 31 is engaged with the second restricting side 20b of the stopper 20, and the middle of the back frame 31 therebetween The stopper 20 is configured not to interfere with the back frame 31 at the tilting position.

  In the present embodiment, in addition to the main reaction force mechanism 4, an auxiliary reaction force mechanism 8 shown in FIG. The auxiliary reaction force mechanism 8 is of a gas spring type arranged at a position connecting the shaft 5g installed on the rear end side of the support base 2 and the shaft 3g installed between the intermediate portions of the back frame 31. Thus, by projecting and retracting the piston rod 82 from the cylinder 81, a reaction force in the standing direction is applied to the back frame 31 using the support base 2 as a scaffold.

  Here, considering the type of conventional chair, the chair back specialized for OA is set to a forward leaning position of about 5 ° with respect to the standing position of the back of the chair that normally performs work. Based on this, in this embodiment, the tilt angle of the spine 3 during normal work is referred to as 0 ° shown in FIG. Then, with this 0 ° as a reference, the tilt angle (maximum standing angle) of the back 3 shown in FIG. 12 when taking a forward tilting posture suitable for OA work is set to −5 °, and from here, FIG. 13 → FIG. 14 → After tilting backward as shown in FIG. 15, the rearward tilting position of 30 ° can be taken in the state of FIG. 16 tilted to the maximum. Then, as shown in FIG. 17, a range from -5 ° to 0 ° is set as the forward tilt angle range A1 as the first tilt range, and a rocking angle range A2 as the second tilt range is set from 0 ° to 30 °. Is set.

  Then, as shown in FIG. 18, only the auxiliary reaction force mechanism 8 works in the forward inclination angle range A1 between (a) and (b), and the main reaction force in the rocking angle range A2 between (b) and (c). Both the mechanism 4 and the auxiliary reaction force mechanism 8 are set to work simultaneously. That is, as shown in FIG. 4D, the first reaction force when the back 5 starts to tilt toward the forward tilt angle range A with reference to the boundary position between the forward tilt angle range A1 and the rocking angle range A2. Between the threshold value f1 and the second reaction force threshold value f2 when the tilting of the spine 5 starts on the side of the rocking angle range A2, a stable region Δf is provided in which the change in the backrest load does not lead to the tilting of the spine 5. . As used herein, the backrest load includes, in a broad sense, a load acting on the standing side as well as a load acting on the rearward tilt side. In the following, it is used in a broad sense as necessary. In providing such a stable region Δf, a stopper or the like for preventing the compression spring 41 from being restored beyond a predetermined position is provided at the compression force input end 41 b of the compression spring 41 or a part of the rotary arm 42. The auxiliary reaction force mechanism 8 is set such that the piston rod 82 is continuously immersed while the back 3 tilts backward from −5 ° to 30 °, and the initial reaction force is maintained even at the position of −5 °. The auxiliary stable region Δf ′ is configured such that the tilting is started by a backrest load exceeding a certain level (however, the immersing amount of the piston rod 82 from −5 ° to 30 ° is slight in this embodiment). is there).

  In order to realize such a function, the main reaction force mechanism 4 of the present embodiment that employs the compression spring 41 is configured not to generate a reaction force in the region of −5 ° to 0 °. That is, as shown in FIGS. 3, 7, and 18 (a), the main reaction force mechanism 4 has the reaction force transmission portion 64 that contacts the rotary arm 42 as the back frame 3 tilts. The compression spring 41 is compressed by rotating the rotary arm 42. At -5 °, the reaction force from the main reaction force mechanism 4 does not reach the reaction force transmission portion 64, and the back frame 31 is an auxiliary reaction force mechanism. 8, the reaction force transmitting portion 64 is set at a position separated from the pressure receiving surface 42 c of the rotating arm 42. Then, the back 3 tilts while compressing the auxiliary reaction force mechanism 8 of the gas spring type from -5 ° to 0 °, so that the reaction force is only at 0 ° as shown in FIGS. 7 and 18B. When the transmission portion 64 comes into contact with the rotating arm 42 and the back frame 31 tilts, the rotating arm 42 is further compressed as shown in FIGS. 7 and 18C together with further compression of the auxiliary reaction force mechanism 8 of the gas spring type. The compression spring 41 of the main reaction force mechanism 4 is compressed while rotating.

  Further, in this embodiment, in order to limit the tilt angle of the spine 3 to a certain range of −5 ° to 30 ° as described above, a locking angle adjusting device 9 as shown in FIGS. 2 and 19 is provided. Yes.

  The locking angle adjusting device 9 includes a pair of angle interlocking members 91 and 92 provided on a support shaft 60, a rearward tilting side angle restricting member 93 and a standing side angle restricting member 94 having shafts 93 b and 94 b parallel to the support shaft 60. And a first operating means 95 and a second operating means 96 for causing the angle regulating members 93 and 94 to move toward and away from the angle interlocking members 91 and 92.

  The angle interlocking members 91 and 92 are supported in a rotatable manner around the support shaft 60, and have a generally fan-shaped plate shape with the floating shaft 63 attached to a portion displaced from the support shaft 60. When rotating around the support shaft 60, the idle shaft 63 is driven to interlock the angle interlocking members 91 and 92. And it has the gear parts 91a and 92a in the one end side extended in radial direction.

  The rearward tilting side angle regulating member 93 is a fan-shaped or sickle-shaped plate, and supports a linear sliding surface 93a provided at a part on the lower end side at a position facing the one angle interlocking member 91. It is arranged so as to be slidably grounded on a stationary surface 21 a set on the bottom wall 21 of the base 2. The term “stationary” as used herein means that it does not interlock with the tilting motion of the back frame 31. Specifically, as shown in FIGS. 2, 3 and 19, etc., a long hole 90c is provided in at least one of the parallel support walls 90a and 90b provided upright on the support base 2, and the long hole 90c. As shown in FIG. 20 (a), a shaft 93b parallel to the support shaft 60 protruding in the thickness direction is inserted into the middle portion of the rearward tilting side angle regulating member 93 so that the shaft 93b moves in the long hole 90c. As described above, the sliding movement 93a of the backward tilt side angle regulating member 93 can be moved toward and away from the angle interlocking member 91 while sliding on the stationary surface 21a. Then, a gear portion 93c having the same pitch as the gear portion 91a of the angle interlocking member 91 is provided at the end portion extended to the angle interlocking member 91 side, and is engaged within the thickness of both by sliding within a predetermined range. Or, it can be in any of the non-engaged states, and as shown in FIG. 20 (b) from the position engaged by the slide, the angle of rearward tilt is restricted only in the direction in which the sliding surface 93a moves away from the stationary surface 21a. The member 93 is configured to be driven to rotate around the shaft 93b. The sliding surface 21a is provided on the side opposite to the gear portion from the shaft 93b, and allows only the operation of the angle interlocking member 91 in the standing direction (clockwise direction in FIG. 20B) from the meshed position, and tilts backward. The operation in the direction (counterclockwise direction) is prohibited. Then, after rotating in the standing direction and then returning in reverse, the sliding surface 93a is again brought into contact with the stationary surface 21a at the same backward tilt angle position of the back 3. The gear portion 93c of the rearward tilting side angle restricting member 93 is formed only in a predetermined region necessary for meshing with the gear portion 91a of the angle interlocking member 91 and synchronously rotating.

  As shown in FIG. 19 and the like, the standing-side angle regulating member 94 is a fan-shaped or sickle-shaped plate, and is a straight line provided at a part on the lower end side at a position facing the other angle interlocking member 92. The sliding surface 94 a is shaped to be slidably grounded to the stationary surface 21 a of the support base 2. Specifically, as shown in FIGS. 2, 3 and 19, etc., a long hole 90f is provided in at least one of the parallel support walls 90d and 90e provided upright on the support base 2, and the long hole 90f. A shaft 94b parallel to the support shaft 60 projected in the thickness direction is inserted into the middle portion of the standing side angle regulating member 94, and the shaft 94b moves within the long hole 90f as shown in FIG. In this manner, the angle-linking member 92 can be contacted and separated while sliding the sliding surface 94a of the rising-side angle regulating member 94 on the stationary surface 21a. Then, a gear portion 94c having the same pitch as the gear portion 92a of the angle interlocking member 92 is provided at the end portion extended to the angle interlocking member 92 side, and is engaged within the thickness of both by sliding within a predetermined range. In addition, while being able to take any of the non-engagement states, as shown in FIG. 21 (b) from the position engaged by the slide, the rising side angle restriction is limited only in the direction in which the sliding surface 94a is separated from the stationary surface 21a. The member 94 is configured to be driven to rotate around the shaft 94b.

  However, the sliding surface 94a of the standing side angle regulating member 94 is provided on the gear portion 94c side with respect to the shaft 94b, and the rearward direction of the angle interlocking member 92 from the meshed position (the counterclockwise direction in FIG. 21B). ) Is allowed only, and operation in the standing direction (clockwise direction) is prohibited. Then, after rotating in the backward tilting direction and returning to the reverse direction, the sliding surface 94a comes into contact with the stationary surface 21a again at the same standing angle position of the spine 3. The gear portion 94c of the rising and tilting side angle restricting member 94 is formed only in a predetermined region necessary for meshing with the gear portion 92a of the angle interlocking member 92 and synchronously rotating.

  As shown in FIG. 2, the angle interlocking members 91 and 92 and the angle regulating members 93 and 94 are one of a pair of side walls 22 and 22 constituting the support base 2 (in this embodiment, the left side as viewed from the seated person). It is arranged to be biased.

  As described above, the rearward tilting side angle regulating member 93 and the standing side angle regulating member 94 are configured so as to be able to engage with and separate individually from the same direction with respect to the angle interlocking members 91 and 92. Normally, as shown in FIG. 19 and the like, the springs 93d and 94d provided on the opposite gear portions side of both members 93 and 94 are separated from the angle interlocking members 91 and 92, and the sliding surfaces 93a and 94a are made stationary. It is made to hold | maintain at the initial position which faced 21a. Then, by operating from the first operating means 95 and the second operating means 96, the corresponding angle restricting members 93, 94 can be moved to positions engaged with the angle interlocking members 91, 92, respectively. .

  As shown in FIG. 2 and FIG. 19, the first operating means 95 includes a lever-type operating portion 95 a, a wire 95 b that extends from the operating portion 95 a to the vicinity of the backward tilt side angle regulating member 93, and a wire 95 b And a rotation member 95c provided at the transmission end. The operation unit 95a is provided in a range that can be reached without changing the upper body (upper body posture) when the seated person turns the left hand back on the outer surface of the back frame 31, as shown in FIG. When the lever 95a1 of the operation portion 95a is pushed from the non-operation position shown in FIG. 5A to the operation position shown in FIG. 5B, the cam 95a2 rotates to pull the wire 95b. The wire 95b is accommodated in the tube 95d and transmits an operation amount from the base end toward the transmission end. A rotating member 95c shown in FIG. 19 is rotatably supported on a standing wall 90a via a shaft 95c1, and a wire 95b is connected to the rotating end side. A torsion spring 95e is wound around a part of the rotating member 95c. The diagonally lower end of 95e is arranged at a position close to the shaft 93b of the rearward tilt side angle regulating member 93. As shown in FIG. 20 (a), when the operation portion 95a is in the non-operation position, the torsion spring 95e is held in a non-contact position with respect to the shaft 93b of the backward tilt side angle regulating member 93, and the operation portion 95a. Is moved to the operating position, the rotating member 95c rotates and presses the spring 95e against the shaft 93b, thereby moving the rear tilt side angle regulating member 93 to a position where it engages with the angle interlocking member 91 against the tension spring 93d. ing.

  The second operating means 96 has substantially the same configuration. As shown in FIGS. 2, 19 and 22, etc., the lever-type operating portion 96a and the standing side angle regulating member 94 from the operating portion 96a. And a rotating member 96c provided at the transmission end of the wire 96b. The operation portion 96a is provided in a range that can be reached without changing the upper body (upper body posture) when the seated person turns the left hand back on the outer side surface of the back frame 31, as shown in FIG. The operation part 96a that restricts the tilting side is arranged side by side with the operation part 95a that restricts the tilt side, and the operation part 96a that restricts the standing side is arranged in front of the operation part 95a that restricts the backward tilt side. The transmission end of the wire 96b is connected to the rotating member 96c shown in FIG. 19 and the like through the tube 96d, and the torsion spring 96e is wound around the rotating member 96c, and the lower end is close to the shaft 94b of the standing side angle regulating member 94. It is arranged at the position to do. When the operation portion 96a is in the non-operation position, the torsion spring 96e is held in a non-contact position with respect to the shaft 94b of the standing side angle regulating member 94 as shown in FIG. When moved to the operation position, the rotating member 96c rotates and presses the torsion spring 96e against the shaft 94b, thereby moving the standing side angle regulating member 94 to a position where it engages with the angle interlocking member 92 against the tension spring 94d. ing.

  As described above, the angle restricting members 93 and 94 are biased by the torsion springs 95e and 96e when the angle restricting members 93 and 94 approach the angle interlocking members 91 and 92. This is because even if the crests of the gears 94c and 92a collide with each other, if the angle interlocking members 93 and 94 are slightly rotated from there, it is possible to realize a meshed state with spring elasticity.

  When the operating portions 95a and 96a are moved again to the non-operating position, the engaged state of the angle interlocking member 91 and the angle restricting member 93 via the gear portions 91a and 93c is released. At this time, the tension spring 93d is released. , 94d and the like serve as offset means for returning the angle regulating members 93, 94 to their initial positions. The standing side angle restricting member 94 has a center of gravity located on the side of the gear part 94c from the shaft, so that its own weight itself functions as a part of the offset means for holding the standing side angle restricting member 94 at the initial position. Of course, the same configuration can be adopted in the rearward tilt side angle regulating member 93.

  As described above, the first operation unit 95 and the second operation unit 96 can be operated at any position during the locking operation of the spine 3, and when the first operation unit 95 is operated, the rearward tilt side is provided. When the angle control member 93 is engaged with the angle interlocking member 91 and prohibits further backward tilting of the spine 3 to restrict the angular position on the locking end side, and the second operation unit 96 is operated, The side angle restricting member 94 engages with the angle interlocking member 92 and prohibits further raising operation of the spine 3 to restrict the angular position on the rocking start end side.

  Since the gear portions 91a and 92a provided on the outer circumferences of the angle interlocking members 91 and 92 are on the circumference around the support shaft 60, the angle regulating members 93 and 94 are rotated regardless of the angular position within a predetermined range. Without changing the relative distance between them, in other words, without changing the working distance at the time of the contact / separation operation of the angle regulating members 93 and 94, it is linked to the spine 3.

  As shown in FIG. 2, the mechanical positional relationship is such that the main reaction force mechanism 4 that applies a reaction force to the rotation of the back frame 31 around the support shaft 60 and the rotation of the back frame 31 around the support shaft 60. The angle restricting members 93 and 94 for restricting both extend in parallel in a direction intersecting the support shaft 60. And, a portion displaced from the support shaft 60 has an idle shaft 63 parallel to the support shaft 60, and when the back frame 31 rotates around the support shaft 60, the idle shaft 63 is driven to rotate the angle interlocking member 91, 92 is interlocked and the reaction force transmission part 64 of the reaction force mechanism 4 is driven.

  Furthermore, the chair of this embodiment is configured such that the position of the back 3 is variable with respect to the seat 5 during the above-described locking operation of the back 3.

  That is, as shown in FIG. 1 that is partially crushed, the spine 3 is configured by attaching a cushion material 32 and a tension fabric 33 to the front end side of the resin shell 30, and a bracket 34 is attached to the back surface. The bracket 34 and the tip of the back frame 31 are connected by a posture control means 3X including a link mechanism 35 and a control rod 36 shown in FIGS. The link mechanism 35 connects the bracket 34 and the back frame 31 with a pair of link members 35a, 35b in order to realize an appropriate position and posture of the back 3 according to tilting, and points 3p, 3q, 3r, 4s link part 35c which consists of 3s is comprised, and the control rod 36 is further arrange | positioned in the position which connects between the said support base 2 and the said link member 35b. The pivot point 36p of the back support rod 36 to the link member 35b is set at a position deviated from the four-point link portion 35c. The rotation center of the control rod 36 is the fulcrum 5g of the support base 2, and the rotation center of the back frame 31 is the fulcrum 5d of the support base 2. Since the rotation fulcrum is different, the control rod 36 is tilted as the back frame 31 is tilted. Is rotated in the locking angle range A2 shown in FIG. 17, the control rod 36 is deformed in the direction of crushing the four-point link portion 35c as shown in FIG. 13, FIG. 14, FIG. 15, and FIG. While moving in the direction of sinking behind the seat 5, the bracket 34 of the back 3 is pulled toward the back frame 31, so that the back 3 is relatively moved away from the seat 5 in the rearward direction. Yes.

  The manner in which the lower end 3a of the spine 3 sinks is clear from FIG. 17, and the manner in which the spine 3 escapes backward from the seat 5 is also clear by paying attention to the lumbar support portion 3P that protrudes most forward of the spine 3. . Since the backward tilting speed of the back 3 is faster than the backward tilting speed of the seat 5, the crossing angle of the back 3 and the seat 5 gradually becomes wider with the backward tilt as shown by the symbol φ in FIG. By moving the back 3 backward from the seat 5, a region where the seat 3 can be substantially seated is expanded, and the back seat can be drooped in a relaxed posture as it is tilted backward. At this time, as shown in FIG. 24, the distance δ from the rear position 5P where the seated person's buttocks are in contact with the seat surface to the lumbar support portion 3P that is likely to be the starting point of the garment rise is suppressed. Thus, there is almost no change with the tilting of the back 3, and the back 3 of the chair can be kept at a substantially constant height without raising the back of the seated person.

  As described above, the chair according to this embodiment is configured such that the back frame 31 supporting the back 3 can be tilted around the support shaft 60 to which the back frame 31 is attached within a predetermined operating range. The angle interlocking members 91 and 92 extending in the direction are provided around the support shaft 60 so as to be interlocked with the tilt of the back frame 31, and can be contacted and separated from the angle interlocking members 91 and 92. Angle restricting members 93 and 94 for restricting part of the operation of the angle interlocking members 91 and 92 by selectively engaging with a part of the interlocking members 91 and 92 are provided. The operation of the spine 3 can be regulated by the engagement with the angle interlocking members 91 and 92.

  As described above, the angle interlocking members 91 and 92 extending in the radial direction from the support shaft 60 are rotated in conjunction with the spine 3 around the support shaft 60, and the angle control members 93 and 92 are moved to the angle interlocking members 91 and 92. Since the angle interlocking members 91 and 92 can be configured compactly around the support shaft 60 if the rotation is controlled by engaging the roller 94, the sliding can be performed as compared with the case where both members slide together. An increase in the direction space can be effectively suppressed. Further, since the rotation of the angle interlocking members 91 and 92 is restricted within the rotation surface of the support shaft 60, it is easy to make the configuration in the direction along the support shaft 60 compact. Further, since the operation of the angle interlocking members 91 and 92 is stably performed by the rotation operation around the support shaft 60, it contributes not only to the stabilization of the entire operation but also to the simplification of peripheral elements such as the guide mechanism. Become. Furthermore, since the back frame 31 is directly restricted via the support shaft 60, the angle adjustment function of the back 3 can be effectively introduced even to a chair that does not have a synchro lock structure.

  The restriction in the above is not limited to the adjustment of the locking angle, but may be a simple back lock or the like.

  Specifically, since the angle restricting members 93 and 94 are arranged in parallel to the angle interlocking members 91 and 92, the bulk in the direction along the support shaft 60 is further effectively suppressed. Can do.

  In addition, since the angle interlocking members 91 and 92 and the angle regulating members 93 and 94 are both planar, both the members 91, 92, 93, and 94 are thinned to realize a more compact configuration. Is possible.

  In this case, since the angle interlocking members 91 and 92 and the angle restricting members 93 and 94 having a planar shape are in a relationship with each other within the thickness at the outer periphery thereof, the installation space is not added in the thickness direction, and more A flatter configuration can be realized. In addition, since the arm of the moment represented by the distance from the center of the both members 91, 93 (92, 94) to the gear portions 91a, 93c (92a, 94c), which are the engaging portions, is restricted at the longest position, stable and reliable It is possible to apply a restrictive force.

  Further, in restricting the operation of the back 3 with respect to both the backward tilt direction and the standing direction, the two angle restricting members 93 and 94 are not arranged on both sides of the angle interlocking members 91 and 92 but are contacted from the same direction. Since it is configured to be separately engaged with each other, a more compact configuration can be realized as compared with the conventional structure in which the angle regulating member and the fixed block portion are brought into a position where the angle interlocking member is sandwiched from both sides.

  Furthermore, angle restricting members 93 and 94 are attached via shafts 93b and 94b parallel to the support shaft 60, and can be rotated synchronously while being engaged with the angle interlocking members 91 and 92. Since the members 93 and 94 and the angle interlocking members 91 and 92 have a fan shape or a sickle shape in which the gear portions 93c, 94c, 91a, and 92a, which are engaging elements necessary for synchronous rotation, are formed only in a required region on the outer periphery. These members 91, 92, 93, 94 can be compactly assembled around the support shaft 60 and the shafts 93 b, 94 b, and the operational stability and the simplification of the bearing structure can be achieved. In addition, by providing the gear portions 93c, 94c, 91a, and 92a only in a necessary region, the bulkiness when moving up and down by rotation can be suppressed to a minimum range.

  Further, the angle interlocking members 91 and 92 and the angle restricting members 93 and 94 have the gear portions 93c, 94c, 91a and 92a, and the angle restricting members 93 and 94 are interposed via shafts 93b and 94b parallel to the support shaft 60. These shafts 93b and 94b perform contact / separation operations with respect to the support shaft 60, whereby the angle regulating members 93 and 94 are connected to the angle interlocking members 91 and 92 via the gear portions 93c, 94c, 91a and 92a. Since it is configured to selectively engage with each other, it is possible to provide a contact / separation operation with a simple structure, and it is possible to engage with only the movement amount of the mesh portion 93c, 94c, 91a, 92a. Since the release operation can be performed, the space required for the operation can be suppressed to a narrow range as much as possible.

  Furthermore, the support base 2 that supports the back 3 and the seat 5 has the support shaft 60 installed between a pair of side walls 22, 22, and the angle interlocking members 91, 92 and the angle regulating members 93, 94. Is disposed to be biased toward the one side wall 21 side, and the central portion of the support base 2 and the other side wall 22 side are opened, so that it can be effectively used as an assembly space for various mechanism parts including the reaction force mechanism 4. It is possible to effectively avoid an increase in the size of the support base 2.

  In this case, a reaction force mechanism 4 that applies a reaction force to the rotation of the back frame 31 around the support shaft 60, and an angle restriction member 93 that restricts the rotation of the back frame 31 around the support shaft 60, 94 extend in parallel to the direction intersecting the support shaft 60, and therefore, the reaction force mechanism 4 and the angle regulating members 93 and 94, which are mechanical parts related to the support shaft 60, are supported by the support shaft 60. It can be efficiently arranged in the support base 2 while being associated with the shaft 60.

  More specifically, it has an idler shaft 63 parallel to the support shaft 60 at a position displaced from the support shaft 60, and the back frame 31 drives the idle shaft 63 when rotating around the support shaft 60. Since the angle interlocking members 91 and 92 are interlocked and the reaction force transmitting portion 64 for transmitting the reaction force to the reaction force mechanism 4 is driven, the rotation of the back frame 31 around the support shaft 60 is performed. It is possible to effectively realize a configuration for efficiently transmitting to the angle interlocking members 91 and 92 and the reaction force transmitting portion 64.

  In addition, this invention is applicable also to the chair which only the back which does not employ | adopt a synchro-rocking structure tilts.

  In addition, the specific configuration of each unit is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 2 ... Support base 3 ... Back 4 ... Reaction force mechanism 5 ... Seat 22 ... Side wall 31 ... Back frame 60 ... Support shaft 63 ... Free-running shaft 64 ... Reaction force transmission part 91, 92 ... Angle interlocking member 91a, 92a ... Engagement element (Gear part)
93, 94 ... Angle regulating member 93c, 94c ... Engagement element (gear part)
93b, 94b ... shaft

Claims (10)

In a structure in which a back frame supporting the back is tiltable around a support shaft to which the back frame is attached within a predetermined operating range, an angle interlocking member extending in a radial direction from the support shaft is interlocked with the tilt of the back frame. As described above, a part of the operation of the angle interlocking member is regulated by selectively engaging with a part of the angle interlocking member. A chair characterized in that an angle restricting member is provided, and the operation of the back can be restricted by engagement between the angle restricting member and the angle interlocking member. The chair according to claim 1, wherein the angle regulating member is arranged in parallel to the angle interlocking member. The chair according to claim 1 or 2, wherein the angle interlocking member and the angle regulating member are both formed into a planar shape. The chair according to claim 3, wherein the angle interlocking member and the angle regulating member that form a planar shape are in a relationship in which the outer periphery thereof is engaged within the thickness. The at least two angle restricting members are configured to be individually engaged with and separated from the angle interlocking member from the same direction in order to restrict the operation of the back in both the backward tilting direction and the standing direction. The chair in any one of 1-4. The angle restricting member is attached via an axis parallel to the support shaft and can be rotated synchronously while being engaged with the angle interlocking member. The angle restricting member and the angle interlocking member are necessary for the synchronous rotation. The chair according to any one of claims 1 to 5, which has a fan shape or a sickle shape in which engaging elements such as a tooth and a friction surface are formed only in a required area on the outer periphery. The angle interlocking member and the angle restricting member have a gear portion, and the angle restricting member is attached via an axis parallel to the support shaft. The chair in any one of Claims 1-6 comprised so that it may selectively engage with an angle interlocking member via a gear part. The support base for supporting the back seat is constructed by suspending the support shaft between a pair of side walls, and the angle interlocking member and the angle restricting member are arranged so as to be biased toward one side wall. The chair according to any one of? 7. A reaction force mechanism that applies a reaction force to the rotation of the back frame around the support shaft and an angle control member that controls the rotation of the back frame around the support shaft in a direction crossing the support shaft. 9. A chair as claimed in claim 8, which extends in parallel. The portion displaced from the support shaft has an idler shaft parallel to the support shaft. When the back frame rotates around the support shaft, the idler shaft is driven to interlock the angle interlocking member and to the reaction force mechanism. The chair according to claim 9, wherein the chair is configured to drive a reaction force transmission unit for transmitting force.

Images