JP6141754B2 - Chair locking mechanism and chair - Google Patents

Description

  The present invention relates to a chair locking mechanism and a chair. More specifically, the present invention relates to a locking mechanism suitable for use in, for example, an office chair.

  Conventionally, a chair that can tilt its backrest within a preset tilting range has been used. As a conventional locking mechanism for a chair that can tilt the backrest, as shown in FIG. 4, the synchro frame 103 that is a supported member can be swung with respect to the main frame 101 that is a supporting member around a swinging shaft 102 A stopper 104 that restricts the tiltable angle of the sync frame 103 is formed on the sync frame 103 and tilts the sync frame 103 (specifically, the sync frame 103 has a reference numeral 103 ′). In some cases, the synchro frame 103 cannot be tilted any more by the stopper portion 104 coming into contact with the locking damper 105 provided on the main frame 101 as the position of the sync frame is tilted. A seat receiving member 107 is supported so as to be able to tilt with respect to the main frame 101 via a tilting shaft 106 and to be able to rotate with the synchro frame 103 via a rotating shaft 108. A support (not shown) is attached. Further, the main frame 101 is attached to the upper end portion of the leg strut 110 of the leg of the chair in which a gas spring is built in the upper portion.

  Furthermore, there is a locking mechanism disclosed in Patent Document 1 as a conventional locking mechanism having the above-described configuration in which a stopper portion is formed on the synchronization frame to regulate the tilt angle of the synchronization frame.

JP 2008-125561 A

  However, in the chair locking mechanism shown in FIG. 4, the locking damper holding portion 109 must be formed at the position where the locking damper 105 of the main frame 101 is provided, and the stopper portion is positioned at the position where the locking damper 105 of the synchro frame 103 abuts. 104 must be formed. Therefore, there is a problem in that the number of member configurations increases and the structure becomes complicated, resulting in an increase in manufacturing cost. In addition, the locking damper holding portion 109 and the stopper portion 104 must be provided and accommodated between the main frame 101 and the seat receiving member 107. Therefore, there is a problem that it is necessary to secure a space for that, and there is a restriction on arrangement of other mechanisms and design. For these reasons, the conventional locking mechanism cannot be said to have high versatility and cannot be said to have high applicability as a structure.

  Therefore, the present invention can regulate the tilting range of the rocking without increasing the member configuration, and reduce the occupation of the space by reducing the occupation of the space and the restrictions on the design of the chair. An object is to provide a locking mechanism.

  In order to achieve this object, a locking mechanism for a chair according to the present invention includes a main frame, a seat receiving member that is swingably connected to the main frame, and a seat receiving member that is swingably connected to the main frame. A back support frame that is rotatably connected, and a fluid spring that has a cylinder and a shaft and is interposed between the main frame and the back support frame, are supported by the cylinder of the fluid spring and the main frame or the main frame. A stopper member is provided to restrict the contraction of the fluid spring before the fluid spring is completely contracted by being interposed between the connected members.

  The chair locking mechanism according to the present invention includes a main frame, a seat receiving member that is swingably connected to the main frame, a swing connection to the main frame, and a pivot connection to the seat receiving member. And a fluid spring having a cylinder and a shaft and interposed between the main frame and the back support frame, and supported and connected to the cylinder of the fluid spring and the back support frame or the back support frame. A stopper member is provided so as to restrict the contraction of the fluid spring before the fluid spring is completely contracted.

  Therefore, according to the locking mechanism of these chairs, before the fluid spring is fully contracted, it is supported by the cylinder of the fluid spring, the main frame or the member supported and connected to the main frame, or the back support frame or the back support frame. The contraction of the fluid spring is restricted by the stopper member coming into contact with the member to be connected. And the structure which controls shrinkage | contraction of a fluid spring is implement | achieved, without providing a special structure in a main frame or a back support frame.

  In addition to the stopper member, the chair locking mechanism of the present invention includes a restricting means for restricting the contraction of the fluid spring, and the restricting means includes a connection pin provided between the main frame and the seat receiving member. It is composed of a long hole provided in the main frame or the seat receiving member, and the connecting pin moves in the long hole as the back support frame and the seat receiving member are tilted and comes into contact with the peripheral surface of the long hole. The contraction of the spring may be regulated. In this case, the contraction of the fluid spring is regulated by the stopper member and the regulating means.

  In the chair locking mechanism of the present invention, the thickness of the stopper member is supported and connected to the cylinder of the fluid spring and the main frame or the main frame in a state where the connecting pin is in contact with the peripheral surface of the long hole. The dimension between the stopper contact surface formed on the member or the dimension between the cylinder of the fluid spring and the stopper contact surface formed on the back support frame or the member supported and connected to the back support frame Alternatively, it may be set equal or larger than the dimension. In this case, the timing between the contact of the stopper member and the contact of the connecting pin of the restricting means is appropriately adjusted.

  In the chair locking mechanism of the present invention, the stopper member may be formed of an elastomeric resin. In this case, the stopper member is appropriately deformed.

  Further, the chair of the present invention includes the above-described chair locking mechanism in which the main frame is attached to the upper end portion of the leg column of the chair leg, the seat receiving member supports the seat, and the back support frame supports the backrest. I have to prepare. In this case, a chair in which the action of the above-described chair locking mechanism is achieved is realized.

  According to the locking mechanism of the chair of the present invention and the chair provided with this locking mechanism, it is a member that regulates the contraction of the fluid spring before the fluid spring completely contracts, that is, regulates the tilting range of the rocking. Since it can be realized with a simple structure without increasing the configuration, versatility can be improved and manufacturing cost can be suppressed. Further, since it is not necessary to secure a space for accommodating a special structure between the main frame and the seat receiving member, there is no restriction on the arrangement of other mechanisms and design, and the versatility is improved from this point. And applicability can be improved.

  In addition to the stopper member, when a restricting means for restricting the contraction of the fluid spring is provided, the contraction of the fluid spring can be restricted by the restricting means in addition to the stopper member, thereby reducing the load applied to the stopper member. It is possible to improve the durability by preventing the stopper member from being damaged.

  In addition, the thickness of the stopper member is such that the stopper spring formed on the cylinder of the fluid spring and the main frame or the back support frame or a member supported and connected to the cylinder in a state where the connecting pin is in contact with the peripheral surface of the elongated hole. When the dimension is set to be equal to or larger than the dimension between the contact surface, the timing between the contact of the stopper member and the contact of the connecting pin is appropriately adjusted. Therefore, specifically, for example, the load at the time of regulating the contraction of the fluid spring (in other words, regulating the tilting of the back support frame) is appropriately distributed to the stopper member and the connecting pin to prevent the members from being damaged. It is possible to improve durability, or to soften the feeling of stopping (feeling of collision) when regulating the contraction of the fluid spring by contacting the connecting pin first after contacting the stopper member first It becomes.

  In addition, when the stopper member is formed of an elastomeric resin, the function of the cushion member is exerted by the deformation of the stopper member. Therefore, the back support frame is tilted to the full and the shaft of the fluid spring is pulled to the full. It is possible to relieve the feeling of stopping (collision feeling) when it is released, and it is possible to improve the comfort of using the rocking.

It is a longitudinal cross-sectional view which shows an example of embodiment of the locking mechanism of the chair of this invention, and is a figure which shows the state in an initial position. It is a top view of the locking mechanism of the chair of an embodiment, and is a figure showing the state in an initial position. It is a longitudinal cross-sectional view of the locking mechanism of the chair of an embodiment, and is a figure showing the state where the back support frame tilted (backward tilt). It is a figure which shows the locking mechanism of the conventional chair.

  Hereinafter, the configuration of the present invention will be described in detail based on an example of an embodiment shown in the drawings.

  1 to 3 show an example of an embodiment of the chair locking mechanism of the present invention. In the present specification, vertical, front / rear, and left / right are defined based on a seated person sitting on a chair.

  In the present embodiment, the main frame 1 attached to the upper end of the leg support 19 of the leg of the chair, and the seat that is disposed above the main frame 1 and supported and attached to the main frame 1 so as to be tiltable. A pair of receiving member 2 and the seat receiving member 2 that are spaced apart from each other and opposed to each other and supported so as to be swingable with respect to the main frame 1 and extend to the rear of the main frame 1 The back support frames 3 and 3 are provided.

  A gas spring is built in the upper part of the leg column 19, and the main frame 1 is attached to the upper end of the gas spring. Further, on the upper surface of the seat receiving member 2, for example, a seat composed of a seat plate serving as a core material, a cushion material placed on the upper surface thereof, and an upholstery covering the cushion material is attached and supported. Further, a backrest is attached to the side of the back support frame 3 that extends rearward of the main frame 1 with a backrest support member such as a back support rod interposed therebetween as necessary. However, since the shape and form of the seat and the backrest are not limited to specific ones, detailed description and illustration are omitted.

  And the locking mechanism of the chair of this embodiment is the main frame 1, the seat receiving member 2 connected with the main frame 1 so that rocking is possible, and the seat receiving member 2 connected with the main frame 1 so that rocking is possible. And a fluid spring 11 having a cylinder 11a and a shaft 11b and interposed between the main frame 1 and the back support frame 3, and a cylinder 11a of the fluid spring 11. And a stopper member 14 for restricting the contraction of the fluid spring 11 before the fluid spring 11 is completely contracted. Yes.

  The main frame 1 is for supporting the seat receiving member 2 and the back support frame 3 and mounting them on the leg support 19 of the leg of the chair. What is necessary is just to provide the site | part to support and rigidity, and it is not limited to a specific structure, a shape, etc. Specifically, in the present embodiment, the main frame 1 includes left and right side walls 1a, 1a, a cylindrical leg strut support portion 1d fitted to an upper end portion of a leg strut 19 of a chair leg, In order to connect the opposing side walls 1a and 1a and the leg support 1d, a top plate, a bottom plate, and a beam, which are bridged between the left and right side walls 1a and 1a and are partially provided as appropriate, have a skeleton structure. The main frame 1 is fixedly attached to the upper end portion of the leg strut 19 having a gas spring built in the upper portion thereof by an interference fit by the leg strut support portion 1d.

  The seat receiving member 2 includes a peripheral upper plate 2c, outer walls 2a and 2a extending from the outer end of the peripheral upper plate 2c to the left and right and extending downward, and an inner end of the peripheral upper plate 2c (that is, the outer wall 2a). , 2a) and inner walls 2b, 2b extending downward in opposition to the left and right.

  The front portion of the seat receiving member 2 is connected to and supported by the main frame 1 via the rotary slide mechanism 5 so that the seat receiving member 2 can slide and tilt with respect to the main frame 1.

  The rotary slide mechanism 5 includes longitudinal holes 1b and 1b in the front-rear direction provided facing the front end positions of the left and right opposing side walls 1a and 1a of the main frame 1, and a longitudinal hole 1b. , 1b and a connecting pin 4 guided by 1b. In addition, the long hole 1b should just be about the front-back direction, and may incline with respect to the horizontal.

  The connecting pin 4 passes through the long holes 1 b and 1 b in the front-rear direction facing the main frame 1 and the left and right inner walls 2 b and 2 b facing each other at the front position of the seat receiving member 2. The connecting pin 4 penetrates the long hole 1b of the main frame 1 so as to be slidable back and forth and to be rotatable about the shaft.

  However, the structure of the rotary slide mechanism 5 is not limited to the above as long as the seat receiving member 2 is connected to the main frame 1 so as to be slidable and tiltable in the front-rear direction. A configuration may be adopted in which long holes in the front-rear direction are provided facing the inner side walls 2b, 2b of the member 2 and fixed to the main frame 1 so as to pass through the side walls 1a, 1a. Alternatively, it is a plate-like link that protrudes from the one surface on one surface in the axial direction and protrudes from the other surface on the other surface in the other axial end (that is, protrudes in the opposite direction to the first connection pin). A pair of left and right links each having a second connecting pin are interposed between the side wall 1a of the main frame 1 and the inner side wall 2b of the seat member 2 (that is, left and right), respectively. The first connecting pin is fixed to and supported by the side wall 1a of the main frame 1 so as to be axially rotatable, and the second connecting pin is fixed to the inner wall 2b of the seat receiving member 2 so as to be axially rotatable. The structure supported may be sufficient.

  The back support frame 3 functions as a lever that supports the backrest (not shown) and tilts the seat receiving member 2 with the swing shaft 6 as a fulcrum. The main frame 1 is slidably connected to the main frame 1 via the provided swing shaft 6 (note that the pair of left and right back support frames 3 and 3 are not shown in FIG. 2).

  The swing shaft 6 is fixed in position with respect to the main frame 1 and passes through the left and right side walls 1a and 1a so as to be axially rotatable, and both left and right end portions are positioned closer to the front ends of the left and right back support frames 3. Inserted.

  The reaction force transmission frame 7 is fixed and attached to a position near the front end of the back support frame 3 (in other words, a position on the main frame 1 side). Specifically, in the present embodiment, the reaction force transmission frame 7 is fixed and attached to the back support frame 3 by the attachment piece 7a.

  A reaction force application mechanism 10 is provided between the main frame 1 and the back support frame 3 to which the reaction force transmission frame 7 is attached (the reaction force application mechanism 10 is illustrated in FIG. 2). Omitted).

  The reaction force applying mechanism 10 repels the backrest (not shown) and tilts the seat receiving member 2 by urging the front end portion of the back support frame 3 backward via the reaction force transmission frame 7. To return to the initial position. The state where the front end of the back support frame 3 is pushed back fully and the backrest attached to the back support frame 3 is pulled up fully is the initial position, and FIGS. 1 and 2 are in the initial position. Represents a state.

  The reaction force imparting mechanism 10 of the present embodiment is interposed between a first mount 10b and a second mount 10c, which are guided by a sliding shaft 10a and can change the distance between them, and the spring mounts 10b and 10c. And a compression coil spring 10d.

  The first mount 10b is inserted into and supported by a support hole formed in a mount receiver 1c formed integrally with the main frame 1.

  The second mount 10c has an engagement hook 10e at the rear end. Then, the engagement shaft 8 attached to the front end of the reaction force transmission frame 7 is fitted into the engagement hook 10e, and the reaction force application mechanism 10 and the back support are supported via the second mount 10c and the reaction force transmission frame 7. The frame 3 is connected to be swingable.

  Further, the seat receiving member 2 and the back support frame 3 are coupled to each other so as to be capable of relative rotation (swing) through a rotation shaft 9 disposed in the left-right direction. Accordingly, the rear portion of the seat receiving member 2 is supported by the back support frame 3, in other words, supported by the main frame 1 via the rotation shaft 9, the back support frame 3, and the swing shaft 6.

  The rotating shaft 9 is fixed to the seat receiving member 2 at a position near the rear end of the seat receiving member 2 and penetrates the opposite left and right outer walls 2a and 2a so as to be axially rotatable. Is inserted into the left and right back support frames 3.

  In addition, the connecting pin 4, the swinging shaft 6, and the rotating shaft 9 are arranged in this order from the front. Further, in order to improve the sliding of these pins and shafts, a sleeve may be attached to a portion through which these pins and shafts penetrate or are supported. In addition, locking means (not shown) such as a head portion, a retaining ring and a retaining ring are appropriately provided at the end so that these pins and shafts do not fall off.

  The rotating slide mechanism 5 including the connecting pin 4 and the rotation shaft 9 constitute a locking mechanism in which the backward tilting operation of the back support frame 3 and the backward tilting operation of the seat receiving member 2 are performed in conjunction with each other. Specifically, first, in a state where no load is applied to the seat or the backrest, the back support is provided by the reaction force applying mechanism 10 and the fluid spring 11 via the reaction force transmission frame 7 as shown in FIG. The front portion of the frame 3 is urged rearward at a position below the swing shaft 6 that is the rotation shaft of the back support frame 3, and the backrest (not shown) supports the back of the seated person in a natural posture. In position (ie, initial position).

  Then, when the seated person leans back (not shown), as shown in FIG. 3, the reaction force applying mechanism 10 (specifically, the compression coil spring 10d) is pushed and shrunk, and the backrest and back are lowered. The support frame 3 tilts backward about the swing shaft 6. At the same time, the rear portion of the seat receiving member 2 is pulled backward and obliquely downward by the connection via the rotating shaft 9 and the connecting pin 4 moves backward in the long holes 1b and 1b, so that the seat receiving member 2 is moved backward. Tilt while sliding.

  On the other hand, when a seated person leaning on his back raises his upper body, the back support frame 3 is raised forward by the reaction force applying mechanism 10 (specifically, the compression coil spring 10d is extended), and at the same time The rear end of the seat receiving member 2 is pushed up and the seat receiving member 2 slides forward.

  As shown in FIG. 3, when the back support frame 3 tilts backward and the seat receiving member 2 tilts while sliding backward, the connecting pin 4 moves in the long holes 1b and 1b of the main frame 1 and is long. By coming into contact with the rear peripheral surfaces of the holes 1b and 1b, the rearward tilt of the back support frame 3 and the sliding and tilting of the seat receiving member 2 are restricted, and at the same time, the contraction of the fluid spring 11 is restricted. That is, the connecting pin 4 and the long holes 1 b and 1 b of the main frame 1 also serve as a restricting means for restricting the contraction of the fluid spring 11.

  In addition, a fluid spring 11 is provided which is interposed between the main frame 1 and the back support frame 3 and exerts a force (repulsive force in the extending direction) to extend between the two (in FIG. The illustration of the spring 11 and the operation mechanism 15 described later is omitted). In the present embodiment, a gas spring with a lock mechanism is used as the fluid spring 11. In addition, when the fluid spring 11 includes the lock mechanism, the back support frame 3 (and the backrest) can be fixed at an arbitrary inclined position. However, the fluid spring 11 is not limited to a gas spring with a lock mechanism, and may be a gas spring without a lock mechanism, or more specifically, an oil spring.

  The gas spring 11 as a fluid spring has a structure in which a piston (not shown) connected to a shaft 11b is built in a cylinder 11a, and spaces on both sides of the piston in the cylinder 11a are communicated with each other through a communication path. With this structure, the gas spring 11 exhibits a repulsive force having a substantially constant magnitude regardless of the position of the piston.

  The gas spring 11 includes an operation mechanism 15 of a lock mechanism on the distal end side in the direction in which the shaft 11b protrudes from the cylinder 11a. Since the operation mechanism of the lock mechanism of the gas spring (fluid spring) and its attachment mode itself are well-known techniques, the details are omitted here. As an outline, the operating mechanism 15 includes an operating arm 15a that presses the adjustment pin 11c at the tip of the shaft 11b of the gas spring 11, and supports the operating arm 15a so as to be swingable about the arm swinging shaft 15b and a gas spring. 11 has a support frame 15c through which the shaft 11b is penetrated and a wire 15d having one end connected to the operation arm 15a in order to swing the operation arm 15a.

  Then, the end (not shown) of the wire 15d opposite to the side connected to the operation arm 15a is pulled, the operation arm 15a swings and the adjustment pin 11c is pushed into the communication path in the cylinder 11a. The provided valve is opened, the gas spring 11 can be expanded and contracted, and the back support frame 3 can be locked. On the other hand, the wire 15d is loosened and the adjustment pin 11c is pulled out to close the valve, the gas spring 11 becomes inextensible and the length is fixed, and the main frame 1, the back support frame 3, and the gas spring 11 A triangular frame is formed, and the back support frame 3 is locked and cannot be locked.

  The support frame 15c is rotatably supported with respect to the main frame 1 by a support shaft 12 disposed in the left-right direction. Thereby, one end (front end in the example shown in FIG. 1) of the gas spring 11 is rotatably connected to the main frame 1.

  The gas spring 11 also has a cylindrical bearing 11d at the end of the cylinder 11a opposite to the side from which the shaft 11b protrudes. 11 d of bearing parts are arrange | positioned by making the axial center direction of a cylindrical through-hole into the left-right direction, penetrate this connecting shaft 13 arrange | positioned in the left-right direction, and this connecting shaft 13 can be rotated (namely, can slide). Support.

  The connecting shaft 13 is inserted into the left and right spine support frames 3 at both left and right ends. The connecting shaft 13 is disposed behind the rotating shaft 9. The other end (the rear end in the example shown in FIG. 1) of the gas spring 11 is rotatably connected to the back support frame 3 by the connecting shaft 13.

  Then, the stopper member 14 is attached to the end surface of the cylinder 11a of the gas spring 11 on the side from which the shaft 11b protrudes (the front end surface in the example shown in FIG. 1) so that the shaft 11b is slidably penetrated.

  The stopper member 14 restricts the pulling of the shaft 11b in a state where the shaft 11b can be further pulled as the fluid spring 11, so that the fluid spring 11 contracts before the fluid spring 11 completely contracts. It is something to regulate.

  The material and shape of the stopper member 14 are not limited to specific ones, and any material can be used as long as it can exert an effect of restricting the contraction of the fluid spring 11.

  In addition, the material of the stopper member 14 is preferably a material that can be appropriately deformed (that is, a material that behaves elastically) rather than a complete rigid body so as to exhibit a function as a cushioning material. Specifically, for example, the material is preferably an elastomeric resin. Moreover, as a shape, as shown in FIG.1 and FIG.3, a cyclic | annular form (doughnut shape) is mentioned.

  As shown in FIG. 3, the thickness of the stopper member 14 is such that when the seated person leans back, the backrest (not shown) and the back support frame 3 are tilted backward about the swinging shaft 6 and rotated. When the rear end of the seat receiving member 2 is pulled backward and obliquely downward by the connection via the shaft 9 and the seat receiving member 2 is tilted while sliding backward by the rotary slide mechanism 5, the connecting pin of the rotary slide mechanism 5 is connected. 4 is a dimension between the stopper contact surface 15e of the support frame 15c and the cylinder 11a in a state in which the 4 is in contact with the rear peripheral surfaces of the long holes 1b and 1b of the main frame 1 (hereinafter referred to as "frame-cylinder dimension"). Is set to the same or larger dimension. If the thickness dimension of the stopper member 14 is extremely large, the contraction is restricted only by a slight contraction of the fluid spring 11, and the tilting range of the back support frame 3 becomes extremely narrow. For this reason, when the thickness dimension of the stopper member 14 is set larger than the frame-cylinder dimension, it is preferable to set the thickness dimension slightly larger than the frame-cylinder dimension.

  In other words, the thickness dimension of the stopper member 14 is attached to the cylinder 11a side of the gas spring 11 at the same time that the connecting pin 4 of the rotary slide mechanism 5 abuts the rear peripheral surface of the long holes 1b, 1b of the main frame 1. The dimension is set such that the stopper member 14 abuts against the stopper abutment surface 15e of the support frame 15c of the operation mechanism 15 or the dimension where the abutment of the stopper member 14 is slightly faster than the abutment of the connecting pin 4. . The stopper member 14 may be attached to the support frame 15c connected to the main frame 1 instead of the cylinder 11a of the gas spring 11 (fluid spring 11).

  A material that can be appropriately deformed is selected as the material of the stopper member 14, and the stopper contact surface 15e of the support frame 15c and the cylinder 11a in a state where the connecting pin 4 is in contact with the rear peripheral surface of the elongated holes 1b, 1b. (That is, a dimension in which the contact of the stopper member 14 is slightly faster than the contact of the connecting pin 4). Accordingly, the connecting pin 4 can be contacted after the stopper member 14 is contacted and deformed first, and the backrest and the feeling of stopping (collision feeling) when the back support frame 3 is tilted back to the full position. It can be relieved and the comfort of using the rocking can be improved.

  Here, the stopper member 14 restricts the contraction of the fluid spring 11 (that is, the drawing of the shaft 11b) to a predetermined degree, and is not limited to the examples shown in FIGS. For example, a washer-like one disposed between the cylinder 11a of the fluid spring 11 and the support frame 15c or a spring spring may be used.

  Further, in the example shown in FIGS. 1 and 3, the stopper member 14 is disposed so as to be interposed between the cylinder 11 a of the fluid spring 11 and the support frame 15 c of the operation mechanism 15. However, while it is essential that the stopper member 14 be disposed in association with the cylinder 11a of the fluid spring 11, it is essential that the stopper member 14 be disposed in association with the support frame 15c of the operation mechanism 15. What is necessary is just to be arrange | positioned linked | related with the main frame 1 instead of a structure.

Specifically, the stopper member 14 is
A) Attached to the cylinder 11a of the fluid spring 11 and abuts against a stopper contact surface formed on the main frame 1. b) A member attached to the cylinder 11a of the fluid spring 11 to be supported and connected to the main frame 1. A) a member that is attached to a part of the main frame 1 and abuts against a stopper abutment surface formed on the cylinder 11a of the fluid spring 11) a member that is supported and connected to the main frame 1 And is arranged in any one of the manners of contacting the stopper contact surface formed on the cylinder 11 a of the fluid spring 11. In the above-described embodiment, the above-described aspect (i) is provided, and the stopper member 14 is a stopper formed on the support frame 15c as a member that is attached to the cylinder 11a of the fluid spring 11 and supported and coupled to the main frame 1. It arrange | positions so that it may contact | abut to the contact surface 15e.

  In the example shown in FIGS. 1 and 3, the stopper member 14 is attached to the end surface (that is, the front end surface) of the cylinder 11 a of the gas spring 11 on the side from which the shaft 11 b protrudes. The position where the is attached is not limited to this. Specifically, for example, an annular flange, ridge, bracket, or arm that extends radially from the outer peripheral surface of the cylinder 11a is provided, and the stopper member 14 may be attached to the flange, ridge, bracket, or arm. good. In addition, an annular flange, hook, bracket, and arm that extend radially from the outer peripheral surface of the cylinder 11a are provided, and the main frame 1 or the main is attached to the stopper contact surface formed on the flange, hook, bracket, and arm. You may make it the stopper member 14 attached to the member supported and connected with the flame | frame 1 contact | abut.

  According to the locking mechanism of the chair of the present invention configured as described above, before the fluid spring 11 is completely contracted, the stopper contact surface formed on the cylinder 11a of the fluid spring 11, or the main frame 1 or A member that is supported and connected to the main frame 1 (support frame 15c as a member that is supported and connected to the main frame 1 in the above-described embodiment), a back support frame 3 or a member that is supported and connected to the back support frame 3; When the stopper member 14 contacts the formed stopper contact surface, the contraction of the fluid spring 11 can be regulated. And the structure which controls shrinkage | contraction of the fluid spring 11 can be implement | achieved, without providing the main frame 1 or the back support frame 3 with a special structure.

  According to the rocking mechanism of the chair of the present invention configured as described above, the structure for regulating the swinging shaft 6 that is the swing center of the back support frame 3 and the swing range of the back support frame 3 and Can be made longer than before. Specifically, compared with the distance between the swing shaft 102 and the stopper portion 104 and the locking damper 105 in the conventional locking mechanism shown in FIG. The distance between the shaft 6 and the stopper member 14 and the stopper contact surface 15e of the support frame 15c is longer. In this way, when the tilt of the back support frame 3 is restricted by increasing the distance between the swing center and the structure for restricting the swing range (in other words, the contact position), the swing range is restricted. It is possible to reduce the load applied to the stopper member 14 and the support frame 15c, which are structures, and it is possible to improve the durability of the locking structure by preventing damage to the swing range regulating structure.

  Although the above embodiment is an example of a preferred embodiment of the present invention, the specific embodiment of the present invention is not limited to this, and various modifications can be made without departing from the scope of the present invention. is there. For example, the specific shapes and modes of the constituent members such as the main frame 1, the seat receiving member 2, and the back support frame 3 are not limited to those in the above-described embodiment, and are based on the use and design of the chair. Are appropriately selected. Specifically, for example, the back support frames 3 and 3 of the above-described embodiment are a pair of frames that are spaced apart from each other and are opposed to each other, but may be a back support frame that includes a single frame. .

  In the above-described embodiment, the reaction force transmission frame 7 is formed as a separate member from the back support frame 3 and is fixedly attached to the back support frame 3. A part having a function may be formed integrally with the back support frame 3.

  In the above-described embodiment, the reaction force applying mechanism 10 having the compression coil spring 10d and the mounts 10b and 10c at both ends is used. However, the reaction force applying mechanism 10 includes the back support frame 3 and the seat support. The mechanism is not limited to a specific mechanism as long as it gives a repulsive force to the tilting of the member 2. Specifically, for example, a fluid spring may be used.

  In the above-described embodiment, the reaction force application mechanism 10 is provided in addition to the fluid spring 11. However, in the present invention, the reaction force application mechanism 10 is not an essential configuration, and the reaction force application mechanism 10 is not provided. It is good also as a structure provided only with the fluid spring 11. FIG. The fluid spring 11 is also interposed between the main frame 1 and the back support frame 3 and exerts a force to extend between the two, and is used for backrest (not shown) and tilting of the seat receiving member 2. On the other hand, a repulsive force can be applied to return to the initial position.

  In the above-described embodiment, the fluid spring 11 is provided at the rear position with respect to the leg support 19 of the chair leg. However, the fluid spring 11 is provided at the front position with respect to the leg support 19 of the chair leg. You may be allowed to. Specifically, for example, instead of the reaction force application mechanism 10 in the example shown in FIG. 1 (in other words, by replacing the reaction force application mechanism 10), it is interposed between the main frame 1 and the back support frame 3. It may be provided. Furthermore, a plurality of fluid springs may be provided. Specifically, for example, two fluid springs may be provided side by side in the left-right direction.

In the above-described embodiment, the shaft 11 b side of the fluid spring 11 is connected to the main frame 1 via the support frame 15 c and the support shaft 12, and the bearing portion 11 d is connected to the back support frame 3 via the connection shaft 13. The stopper member 14 is provided between the cylinder 11 a of the fluid spring 11 and the main frame 1, and the shaft 11 b side of the fluid spring 11 is back-supported via the support frame and the connecting shaft 13. A stopper member 14 is provided that is connected to the frame 3 and has a bearing portion 11 d connected to the main frame 1 via a support shaft 12 and interposed between the cylinder 11 a of the fluid spring 11 and the back support frame 3. You may be allowed to. In this case, as an aspect in which the stopper member 14 interposed between the cylinder 11a of the fluid spring 11 and the back support frame 3 or a member supported and connected to the back support frame 3 is provided, specifically,
F) A member that is attached to the cylinder 11a of the fluid spring 11 and abuts against a stopper contact surface formed on the back support frame 3. G) A member that is attached to the cylinder 11a of the fluid spring 11 and is supported and connected to the back support frame 3. A) abuts against the stopper abutment surface formed on the c) and abuts against the stopper abutment surface formed on the cylinder 11a of the fluid spring 11 by being attached to one part of the back support frame 3) It is attached to the member to be connected and comes into contact with a stopper contact surface formed on the cylinder 11a of the fluid spring 11.

  When the stopper member 14 is provided between the cylinder 11a of the fluid spring 11 and the back support frame 3 or a member supported and connected to the back support frame 3 as described above, The distance between the swing shaft 6 which is the swing center of the back support frame 3 and the structure for regulating the swing range of the back support frame 3 can be made longer than the example shown in FIG. It is possible to further reduce the load applied to the swing range regulating structure when regulating the tilting of the support frame 3.

  In the above-described embodiment, since the members such as the main frame 1 and the back support frame 3 are connected to each other so as to be able to swing, rotate, and rotate, both members are provided with left and right through holes and the left and right sides are provided. A single shaft or pin provided over the through-hole is used. However, the structure is not limited to the above-described structure as long as the members are connected so as to be able to swing, rotate, and rotate. The two members may be connected to each other by using two short shafts and pins, and the left and right shafts and pins may be connected to each other. A cylindrical protrusion may be provided on one member and a through hole or a recess may be provided on the other member. Alternatively, a C-shaped claw portion (bearing portion) may be provided, and these convex portions and the through holes / recess portions / claw portions may be slidably engaged and connected.

DESCRIPTION OF SYMBOLS 1 Main frame 2 Seat receiving member 3 Back support frame 11 Fluid spring 11a Cylinder 11b Shaft 14 Stopper member 19 Leg support

Claims (6)

  A main frame, a seat receiving member whose front part is swingably connected to the main frame, and a back support frame that is swingably connected to the main frame and rotatably connected to the seat receiving member And a fluid spring interposed between the main frame and the back support frame having a cylinder and a shaft, and a member supported and connected to the cylinder of the fluid spring and the main frame or the main frame And a stopper member for restricting the contraction of the fluid spring before the fluid spring is completely contracted.   A main frame, a seat receiving member whose front part is swingably connected to the main frame, and a back support frame that is swingably connected to the main frame and rotatably connected to the seat receiving member And a fluid spring having a cylinder and a shaft and interposed between the main frame and the back support frame, and supported and coupled to the cylinder of the fluid spring and the back support frame or the back support frame. A locking mechanism for a chair, characterized in that a stopper member is provided to restrict the contraction of the fluid spring before the fluid spring is completely contracted.   In addition to the stopper member, a restricting means for restricting the contraction of the fluid spring is provided, and the restricting means includes a connecting pin provided between the main frame and the seat receiving member and the main frame or the seat receiving member. A long hole provided in the member, and as the back support frame and the seat receiving member are tilted, the connecting pin moves in the long hole and comes into contact with the peripheral surface of the long hole. 3. The chair locking mechanism according to claim 1, wherein contraction of the fluid spring is restricted.   The thickness dimension of the stopper member is formed on the cylinder of the fluid spring and the main frame or a member that is supported and connected to the main frame in a state where the connecting pin is in contact with the peripheral surface of the long hole. Or a dimension between the cylinder of the fluid spring and the stopper abutting surface formed on the back support frame or a member supported and connected to the back support frame. The chair locking mechanism according to claim 3, wherein the chair locking mechanism is set equal to or larger than the dimension.   The chair locking mechanism according to any one of claims 1 to 4, wherein the stopper member is formed of an elastomeric resin.   The said main frame is attached to the upper end part of the leg support | pillar of a leg of a chair, the said seat receiving member supports a seat, and the said back support frame supports a backrest. A chair comprising a chair locking mechanism.

Images