JP6774729B2 - Chair operating lever and chair - Google Patents

Description

The present invention relates to a chair operating lever and a chair. More specifically, the present invention relates to a lever that operates a mechanism for raising and lowering a seat and a mechanism for tilting a backrest, and a chair provided with such an operating lever.

As a conventional mechanism for raising and lowering the seat, as shown in FIGS. 15 and 16, a synthetic resin pull portion 102 extending in the left-right direction along the lower surface of the front portion of the seat and a metal to which the pull portion 102 is attached. The elevating lever 100 is configured to include the rotating portion 101, and the rotating portion 101 includes a pressing portion 101a that pushes the push valve 105a of the gas cylinder 105 and a rotation that is located on the front side of the pressing portion 101a. A pair of left and right parallel portions 101c and 101c extending forward from the left and right ends of the rotating shaft portion 101b and the left and right ends of the pulling portion 102 from each of the parallel portions 101c and 101c. A pair of left and right connecting portions 101d and 101d extending toward each of the portions, and a pair of left and right connecting portions 101d and 101d extending in opposite directions while overlapping the lower surface of the pulling portion 102 and fixed to the pulling portion 102. In some cases, the extension portions 101e and 101e of the above are connected and integrally formed (Patent Document 1). When the pull portion 102 is pulled upward, the push valve 105a of the gas cylinder 105 constituting the pedestal is pushed by the pressing portion 101a, and the gas cylinder 105 is in a free state in which it can be expanded and contracted (that is, can be raised and lowered).

In the mechanism for raising and lowering the seat of Patent Document 1 described above, the rotating shaft portion 101b, the pair of parallel portions 101c, 101c, and the pair of connecting portions 101d, 101d, which constitute the rotating portion 101, are bent and connected. And the pair of extension portions 101e and 101e are formed by bending one wire rod. Further, the pressing portion 101a is a metal plate, and the front end portion is fixed by being welded to the rotating shaft portion 101b. Then, a U-shaped bearing groove 104a having a downward side view that fits into the rotation shaft portion 101b of the rotation portion 101 is formed on each of the left and right side plates of the bearing 104, and the rotation portions 101 are paired via the bearing 104. The upward opening groove 103a into which the parallel portions 101c and 101c of the above are loosely fitted is rotatably attached to the bearing base 103 formed on the front plate.

Japanese Unexamined Patent Publication No. 2006-212152

In the mechanism for raising and lowering the seat of Patent Document 1, the rotating shaft portion 101b to which the pressing portion 101a is attached and the pair of parallel portions 101c and 101c are formed by bending, and the rotating portion is further connected to these rotating portions. A pair of connecting portions 101d and 101d and a pair of extension portions 101e and 101e are formed by bending in order to convert and transmit the pulling operation of the pulling portion 102 for operating the 101 so that the pressing portion 101a swings. Will be done. However, since the rotating portion 101 is formed by using a wire rod having appropriate strength as an operation mechanism, it requires appropriate equipment, labor, and labor to perform complicated bending of such a wire rod a plurality of times. There is a problem that the yield may deteriorate. Therefore, it cannot be said that it can be easily applied as a mechanism for raising and lowering the seat of a chair, and it cannot be said that it is highly versatile.

In the mechanism for raising and lowering the seat of Patent Document 1, the seat bearing base 103 also supports the rotating portion 101 rotatably and operates the pulling portion 102 arranged outside the bearing base 103. In order to transmit to the pressing portion 101a arranged inside, the space for arranging the rotating portion 101 that is bent in a complicated manner is adjusted in relation to other mechanisms, and then the bearing base. In addition to being secured in the 103 and forming the opening groove 103a, it is necessary to provide the bearing 104 in which the bearing groove 104a is formed. Therefore, there is a problem that the design of the seat support base 103 becomes complicated and the processing time and the number of parts increase. Therefore, it cannot be said that it can be widely and easily applied to chairs having various configurations in various modes, and it cannot be said that it is highly versatile.

Therefore, the present invention presents an operation lever that can operate the mechanism of raising and lowering the seat and the mechanism of tilting the backrest without requiring complicated design, laborious processing, and complicated mechanism, and this operation. The purpose is to provide a chair with a lever.

In order to achieve such an object, the operating lever of the chair of the present invention has a rotating shaft that penetrates a pair of opposing members in a direction in which the pair of members face each other and is rotatably supported by the pair of members. A strut member that is attached to a section supported by a pair of members of the rotation shaft and that rotates with the rotation of the rotation shaft to control the swing of the synchro frame with respect to the main frame. has a section straight rod-like der supported by at least one pair of members of the rotation shaft is, a through hole for passing the rotation shaft on an inner peripheral surface of the through hole with included in突張Ri member A time when a groove is formed and the groove is provided with a bump on one end surface side of the through hole, and a protrusion formed on the outer peripheral surface is provided with a rotation shaft and inserted into the through hole of the tension member. When the protrusion of the moving shaft engages with the groove of the tension member and abuts against the protrusion, the tension member rotates with the rotation of the axis of the rotation shaft and in the axial direction of the rotation shaft. The movement is restricted .
Further, the operation lever of the chair of the present invention has a rotation shaft that penetrates a pair of facing members in a direction in which the pair of members face each other and is supported by the pair of members so as to be axially rotatable, and the rotation shaft. It has a pressing member that is attached to a section supported by a pair of members and rotates with the rotation of the rotating shaft to open and close the push valve of the gas spring of the pedestal. The section supported by at least one pair of members of the shaft is a straight rod shape, and the pressing member is provided with a through hole for penetrating the rotating shaft, and a groove is formed on the inner peripheral surface of the through hole and the groove is formed. A protrusion is provided on one end surface side of the through hole, a protrusion formed on the outer peripheral surface is provided by the rotation shaft, and the protrusion of the rotation shaft inserted into the through hole of the pressing member is a pressing member. By engaging with the groove and abutting against the abutting portion, the pressing member rotates with the axis rotation of the rotating shaft, and the movement of the rotating shaft in the axial direction is restricted.

Therefore, according to the operating lever of this chair, the section supported by at least one pair of members of the rotating shaft is made to be a straight rod shape, so that the complicated design, laborious processing and complicated mechanism are made. A state in which the seat can be switched between a state in which the seat can be raised and lowered and a state in which the seat cannot be raised and lowered, and a state in which the backrest can be tilted by operating the mechanism for raising and lowering the seat and the mechanism for tilting the backrest without the need for And the state of being unable to tilt may be switched.

The chair operating lever of the present invention may be provided with a structure that restricts the movement of the tension member or the pressing member in the axial direction of the rotation shaft. In this case, a strut member or a pressing member is predetermined for the pair of members without the need for a separate member used in combination with the pair of members, that is, without the need for a complex mechanism. It is arranged and positioned at the position of.

Further, the chair of the present invention is provided with the above-mentioned operating lever. In this case, a chair in which the action of the above-mentioned operating lever is exhibited is realized.

According to the operation lever of the chair of the present invention and the chair provided with this operation lever, the seat can be raised and lowered and cannot be raised and lowered without the need for complicated design, laborious processing and complicated mechanism. Since it is possible to realize a structure that switches between a certain state and a state in which the backrest can be tilted and a state in which the backrest cannot be tilted, it is possible to design an elevating lock mechanism for the seat of the chair and a tilt lock mechanism for the backrest. It is also possible to improve the efficiency of manufacturing and to improve the versatility of the chair seat elevating lock mechanism and the backrest tilt lock mechanism.

The operating lever of the chair of the present invention and the chair provided with the operating lever have a complicated mechanism when a structure for restricting the movement of the tension member or the pressing member in the axial direction of the rotation shaft is provided. Since the tension member or the pressing member can be arranged and positioned at a predetermined position with respect to the pair of members without the need for a chair seat elevating lock mechanism or a backrest tilt lock mechanism. It is possible to further improve the efficiency of design and manufacturing, and further improve the versatility of the chair seat elevating lock mechanism and the backrest tilt lock mechanism.

In the chair operating lever of the present invention and the chair provided with the operating lever, the protrusion of the rotating shaft formed by the crushing process engages with the groove of the tension member or the pressing member and abuts on the protrusion. In some cases, a strut member or a pressing member can be attached to the rotating shaft after restricting the rotation with respect to the rotating shaft without requiring laborious processing or a complicated mechanism. Further, since the rotation shaft and the tension member or the pressing member can be arranged with respect to the pair of members after restricting the movement of the rotation shaft in the axial direction, the lifting lock mechanism and the back of the chair seat can be arranged. It is possible to further improve the efficiency of designing and manufacturing the tilt lock mechanism of the leaning back, and further improve the versatility of the tilting lock mechanism of the chair seat and the tilting lock mechanism of the backrest. It will be possible.

It is a front perspective view which shows the whole structure of the chair of embodiment. It is a front exploded perspective view which shows the whole structure of the chair of embodiment. It is a front perspective view which shows an example of the structure of the part related to the elevating lock mechanism and the tilt lock mechanism (including a leg body). It is a rear perspective view which shows an example of the structure of the part related to the elevating lock mechanism and the tilt lock mechanism (including a leg body). It is a front perspective view which shows an example of the structure of the part related to the elevating lock mechanism and the tilt lock mechanism (excluding the leg body). It is a rear perspective view which shows an example of the structure of the part related to the elevating lock mechanism and the tilt lock mechanism (excluding the leg body). It is a figure which shows the structure of the tilt lock mechanism of an embodiment, and is the figure which shows the synchro frame in a transparent state. It is a forward disassembled perspective view which shows the structure of the tilt lock mechanism of embodiment. FIG. 5 is an exploded perspective view showing a tension member, a tilt lock rotation shaft, and a tilt operation lever in the tilt lock mechanism of the embodiment. It is a figure which looked at the tension member of an embodiment from the side opposite to FIG. It is a rear perspective view which shows the structure of the elevating lock mechanism of embodiment. FIG. 11 is a diagram showing the main frame of FIG. 11 in a transparent state. It is an exploded perspective view which shows the pressing member in the elevating lock mechanism of embodiment, the elevating lock rotation shaft, and the elevating operation lever. It is a figure which looked at the pressing member of an embodiment from the side opposite to FIG. It is an exploded perspective view which shows the mechanism of raising and lowering a seat including a conventional lock mechanism. It is an exploded perspective view which shows the mechanism of raising and lowering a seat including a conventional lock mechanism.

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 14 show an operation lever of the chair of the present invention and an example of an embodiment of a chair provided with the operation lever.

In the present embodiment, the present invention relates to a chair whose overall configuration is as shown in FIGS. 1 and 2 and whose structure of a portion related to the present invention is as shown in FIGS. 3 and 4. The case where the operation lever is applied will be described as an example.

Further, in the description of the present invention, "upper" and "lower", "front" and "rear", and "left" and "right" are defined (in other words) with reference to the seated person sitting on the chair. Means "upper" and "lower", "front" and "rear", and "left" and "right" when viewed from the seated person).

The chair of the present embodiment includes a leg body 9, a main frame 1 attached and supported by an upper end portion of the leg body 9, a synchro frame 10 rotatably attached to the main frame 1, and the like. It has a backrest 8 attached to the synchro frame 10 (cushion material and upholstery are not shown), and a seat 7 arranged above the main frame 1 and supported by the main frame 1. The seat front support shaft 5, the seat rear support shaft 6, and the synchro frame 10 are interposed so that the tilting motion of the backrest 8 with respect to the main frame 1 and the motion of the seat 7 can be synchronized and interlocked. The seat rear support shaft 6 is not shown in FIGS. 5 to 8.

In the chair of the present embodiment, the backrest 8 attached to the synchro frame 10 that swings with respect to the main frame 1 and functions as a back support rod tilts while receiving a repulsive force by the reaction force applying device 12. Alternatively, the tilt lock mechanism limits the swinging motion of the synchro frame 10, so that the synchro frame 10 cannot be tilted and is fixed at the initial position. Further, the seat 7 supported by the main frame 1 is moved up and down by the expansion and contraction operation of the pedestal 9a of the leg body 9, and the expansion and contraction operation of the pedestal 9a is restricted by the elevating lock mechanism, so that the seat 7 cannot be expanded and contracted as appropriate. It is fixed at the height of.

The leg body 9 includes a pedestal 9a that supports the seat 7 via the main frame 1, a leg base in which the pedestal 9a stands in the center and has a plurality of leg blades 9b, and a plurality of leg blades. 9b has casters 9c attached to the lower surface of each tip.

The pedestal 9a has a cylinder and a piston rod that can move up and down with respect to the cylinder, and is a lock mechanism that can be operated via a push valve 9e (also referred to as a “push pin”) provided at the tip of the piston rod. Consists of a gas spring with. The pedestal 9a (that is, the gas spring) is fixed to the leg base by fitting and fixing the cylinder of the pedestal 9a into the through hole provided in the center of the leg base.

The locking mechanism associated with the tilting motion of the backrest 8 is a main frame 1, a synchro frame 10 that tiltably connects the backrest 8 to the main frame 1 via a rotation shaft 4, and a rear end of the main frame 1. Arranged in the portion, it is interposed between the main frame 1 and the synchro frame 10 so that the synchro frame 10 stands up with respect to the main frame 1 and thus the backrest 8 stands up (in other words, tilts backward). A reaction force applying device 12 that applies a reaction force (to recover from the posture to the initial upright posture) and a tilt lock mechanism that stops the swinging motion of the synchro frame 10 and enables the backrest 8 to be fixed so as not to tilt backward. It is configured as a mechanism including 13, 14, 15).

The main frame 1 includes a top plate portion 1A, a pair of left and right side wall portions 1B and 1B extending downward from each of the left and right ends of the top plate portion 1A and facing each other in the left-right direction, and a top plate portion. It has a bottom plate portion 1C located below 1A. The main frame 1 is covered with the under-seat front cover 3A and the under-seat rear cover 3B so as not to be exposed to the outside.

A through hole (hidden by the pedestal receiving metal fitting 9d and not shown in the drawing) is formed in the bottom plate portion 1C of the main frame 1 into which the pedestal receiving metal fitting 9d is inserted and fixed.

The pedestal receiving metal fitting 9d fits and holds a portion of the pedestal body 9 near the top of the pedestal 9a (specifically, a portion near the tip of the piston rod of the gas spring constituting the pedestal 9a). , Fixed to the pedestal 9a. As a result, the pedestal 9a and the main frame 1 are connected via the pedestal receiving metal fitting 9d, and the main frame 1 is fixedly attached to the upper end portion of the pedestal 9a.

The top of the pedestal 9a (specifically, the pedestal 9a) is formed at a position of the top plate portion 1A of the main frame 1 facing the through hole (not shown in the drawing) of the bottom plate portion 1C in the vertical direction. A pedestal support hole 1e for exposing the push valve 9e) provided at the tip of the piston rod of the gas spring is formed. The pedestal support hole 1e is formed so as to be squeezed inward in a funnel shape by press working.

Then, in a state where the pedestal receiving metal fitting 9d penetrates the through hole of the bottom plate portion 1C and the pedestal supporting hole 1e of the top plate portion 1A, the peripheral wall of the pedestal receiving metal fitting 9d, the through hole, and the peripheral edge of the pedestal supporting hole 1e. The parts are fixed by welding.

An elongated hole 1g is formed at a position near the front end of each of the left and right side wall portions 1B and 1B of the main frame 1 so as to penetrate and support the seat front support shaft 5 in the left-right direction. The elongated hole 1g is formed with the rear diagonally upward direction as the longitudinal direction from the position near the front end of the main frame 1, and supports the seat front support shaft 5 so as to be movable along the longitudinal direction.

Further, in each of the left and right side wall portions 1B and 1B of the main frame 1, a through hole (not shown in the drawing) behind the elongated hole 1g and the bottom plate portion 1C and a pedestal support hole 1e of the top plate portion 1A. A hole 1h is formed at a position closest to the front so as to penetrate the elevating lock rotating shaft 21 of the elevating lock mechanism in the left-right direction to support the shaft so as to be rotatable. A hole 1i is formed in which the hole 1i is rotatably supported.

Then, the synchro frame 10 is rotatably connected to and attached to the main frame 1 by the rotating shaft 4.

The synchro frame 10 connects the main frame 1 and the backrest 8, and the front side is rotatably attached to the main frame 1 by the rotating shaft 4, and the backrest 8 is attached to the rear end. As a result, the synchro frame 10 is connected to the main frame 1 so as to be swingable along the vertical plane, and as a lever that supports the backrest 8 and tilts the backrest 8 with the rotation axis 4 as a fulcrum. Function.

The synchro frame 10 that supports the backrest 8 is also exerted by a reaction force applying device 12 that is provided so as to intervene between the backrest 8 and the backrest 8 when the backrest 8 tilts backward. The force to push it back to its original position is transmitted to the backrest 8.

The synchro frame 10 has a pair of left and right frame portions 10A and 10A formed in a flat plate shape having the same shape and facing each other in the left and right directions, and a pair of left and right frame portions 10A and 10A on the rear side of the pair of left and right frame portions 10A and 10A. It is provided between the backrest mounting portion 10B provided between the 10A and 10A and to which the backrest 8 is attached, and between the pair of left and right frame portions 10A and 10A at the position in front of the backrest mounting portion 10B. It has a cross-linked portion 10C.

A hole 10d is formed in each of the pair of left and right frame portions 10A and 10A of the synchro frame 10 to support the seat rear support shaft 6 by penetrating it in the left-right direction at the front end portion, and a rotation shaft 4 is formed at a position behind the hole 10d. A hole 10e is formed to support the hole 10e by penetrating it in the left-right direction, and further, a tilt lock rotation shaft 13 of the tilt lock mechanism is passed through the tilt lock mechanism in the left-right direction at a position behind the hole 10e and at the front end portion of the bridge portion 10C. A rotatably supporting hole 10f is formed.

The seat 7 covers the seating member 7A supported and attached to the main frame 1, the seating plate attached to the upper surface of the seating member 7A and serving as a core material, and the upper surface and side surfaces of the seating plate. It has a cushion material attached to the seat plate and an upholstery 7B that covers the cushion material. The seat receiving member 7A and the seat plate are formed of, for example, resin. The seat plate and cushion material are not shown in the drawings.

The seat 7 has a pair of left and right elongated holes 1g and 1g formed at the front end of the main frame 1 with the rear diagonally upward as the longitudinal direction in the left-right direction and inside the elongated holes 1g and 1g in the longitudinal direction of the elongated holes 1g. The front side is supported by the seat front support shaft 5 that movably penetrates along the seat, and the seat rear support shaft 6 that penetrates the pair of left and right holes 10d and 10d formed in the front end of the synchro frame 10 in the left-right direction (note that). , Not shown in FIGS. 5-8) to support the rear side.

As the seat front support shaft 5 moves along the longitudinal direction in the elongated hole 1g formed with the rear diagonally upward direction as the longitudinal direction, the front side of the seat 7 moves up or down while moving backward. Is supported.

The seat receiving member 7A is formed at a position on the front side of the lower surface and is connected to the seat front support shaft 5, a pair of left and right bearing portions 7c and 7c, and is formed at a position on the rear side of the lower surface and is connected to the seat rear support shaft 6. It has a pair of left and right hooks 7d and 7d.

As a result, the seat receiving member 7A, and thus the seat 7, is supported by the main frame 1 via the seat front support shaft 5, the seat rear support shaft 6, and the synchro frame 10, and the synchro frame 10 swings. (By extension, the tilt of the backrest 8) operates in conjunction with this.

Specifically, when the seated person leans against the backrest 8, the synchro frame 10 rotates around the rotation shaft 4 as a rotation support shaft, and the backrest 8 tilts backward. At that time, the synchro frame 10 rotates. Along with the operation, the rear side of the seat receiving member 7A is pulled up diagonally upward and backward via the seat rear support shaft 6 and hooks 7d and 7d, and the elongated hole 1g and the seat front support shaft 5 pass through the bearing portions 7c and 7c. The front side of the seat bearing member 7A is pulled up diagonally upward and backward, and the entire seat 7 is lifted, and the backrest 8 and the seat 7 are interlocked to perform a locking operation.

Further, when the backrest 8 tilts backward, the reaction force applying device 12 applies a repulsive force to the backward tilting motion of the backrest 8 via the synchro frame 10.

On the other hand, when the seated person tries to raise the upper body, the seat 7 is pushed forward and diagonally downward, and at that time, the synchro frame 10 rotates via the hooks 7d and 7d and the seat rear support shaft 6. The backrest 8 is erected.

Further, when the backrest 8 stands up, the reaction force applying device 12 applies an urging force to the standing motion of the backrest 8 via the synchro frame 10.

The backrest 8 includes a shell member 8A fixedly attached to the synchro frame 10, a back plate 8B attached to the front surface of the shell member 8A, and a cushion material on the side of the back plate 8B that is in contact with the front surface. It has an upholstery (note that the upholstery including the cushioning material is not shown).

The shell member 8A is configured as a member having high rigidity in order to secure the strength required for the backrest 8. In order to provide the shell member 8A with high rigidity, specifically, for example, a reinforced resin such as nylon containing glass fiber, polyacetal (POM), polypropylene (PP), a polyamide resin such as nylon, or iron, It is formed using materials other than resin such as aluminum alloy and stainless steel.

Since the back plate 8B is a member that supports the back of the upper body (specifically, the back and the back of the lumbar region) of the seated person while interposing the upholstery and cushioning material, the back plate 8B is seated when leaning against the backrest 8. It is configured as a member with appropriate flexibility in order to fit on the back of the upper body of a person and realize good comfort. The back plate 8B is specifically formed by using a resin such as polypropylene (PP) or nylon 6 (PA6) in order to have appropriate flexibility.

That is, the backrest 8 is configured to form a three-layer structure consisting of a shell member 8A having sufficient rigidity, a back plate 8B having appropriate flexibility, and a cushioning material having good cushioning and breathability.

In the shell member 8A, the portion that supports the upper body of the seated person (referred to as "upper body support portion 8d") is curved in the middle portion in the vertical direction in the lateral view and the longitudinal sectional view in the front-rear direction. In addition to this, the middle portion in the left-right direction is formed in a shape that is recessed and curved backward in the plan view and the cross-sectional view. The shell member 8A is designed on the assumption that the portion protruding forward in the side view supports the vicinity of the seated person's waist.

On each of the left and right edge portions of the lower portion of the upper body support portion 8d of the shell member 8A, a pair of left and right armrest portions 8e and 8e protruding forward from each of these left and right edge portions and formed in a circle shape are upper bodies. It is formed integrally with the support portion 8d.

As described above, since the shell member 8A is configured as a member having high rigidity, the armrest portion 8e is formed and provided as a portion having sufficient rigidity as an armrest.

The circle of the armrest portion 8e includes an generally horizontal upper side as an armrest portion, a front side extending diagonally downward from the front end of the upper side to the lower ends of the left and right edges of the upper body support portion 8d, and the front side. It is formed by the left and right edges of the upper body support portion 8d between the rear end (in other words, the lower end) and the rear end of the upper side.

In the case of a cantilever-shaped armrest that supports one point at the rear end or a T-shaped armrest that supports one point in the middle, for example, a pocket of clothing may get caught, whereas the armrest 8e When the beams are formed in a circle shape, pockets and the like are not caught, so that comfort when using a chair can be improved. Further, by forming the armrest portion 8e in a circle shape, it is possible to improve the stability and strength as compared with the cantilever-shaped or T-shaped armrest.

The rear ends of the upper sides (that is, the elbow rests) of the pair of left and right armrests 8e and 8e are connected to the most forwardly protruding portion of the shell member 8A in the side view.

A frame fixing portion as a space for opening downward (in other words, at the lower end) to the lower end portion of the shell member 8A and fitting the backrest mounting portion 10B of the synchro frame 10 and the frame portions 10A and 10A on both the left and right sides thereof. 8c is formed. Further, four through holes communicating from the front surface side of the shell member 8A to the space as the frame fixing portion 8c are formed.

Further, four through holes 10g are formed in the backrest mounting portion 10B of the synchro frame 10 in the same positional relationship as the through holes formed in the frame fixing portion 8c of the shell member 8A.

Then, the upper portion of the synchro frame 10 is inserted from the opening at the lower end of the shell member 8A, the backrest mounting portion 10B is fitted into the frame fixing portion 8c, and then four through holes formed in the frame fixing portion 8c. The frame fixing portion 8c (extendedly, the shell member 8A) is attached to the backrest mounting portion 10B by four screws leading to each of the through holes 10g formed in the backrest mounting portion 10B, which are inserted from each of the above. ) Is fixed directly. As a result, the backrest 8 is tiltably attached to the main frame 1 via the synchro frame 10.

The reaction force applying device 12 is a mechanism for exerting a reaction force on the synchro frame 10 that swings with respect to the main frame 1.

The reaction force applying device 12 is arranged so as to be interposed between the rear end portion of the main frame 1 and the middle of the synchro frame 10 and behind the rotation shaft 4, and causes the synchro frame 10 to stand up (in other words, in other words). By urging in the direction (to stand up), it works to give a repulsive force / reaction force to the operation of the backrest 8 and the seat 7 and return it to the initial position.

The initial position is a state in which the rear side of the synchro frame 10 is pushed upward and the backrest 8 attached to the backrest mounting portion 10B on the rear side of the synchro frame 10 is pulled up to the full extent and stands upright. For example, FIGS. 1 and 3 to 6 show the initial positions.

The reaction force applying device 12 is arranged coaxially with each other and is guided by a sliding shaft (not shown) so that the distance between the two mounts can be changed, and the reaction force applying device 12 is interposed between the pair of mounts. Each of these pair of mounts has a compression coil spring that fits at both ends.

Each of the pair of mounts has a shaft that is inserted into the compression coil spring and a hemispherical protrusion that projects toward the opposite side of the shaft.

Then, recesses that slidably support the hemispherical protrusions of the mount while abutting and fixing the positions are formed in the rear end portion of the bottom plate portion 1C of the main frame 1 and the cross-linked portion 10C of the synchro frame 10. It is formed, and each of the hemispherical protrusions of the pair of mounts is brought into contact with and supported by these recesses.

Here, the reaction force applying device 12 does not include a mechanism (that is, a lock mechanism) for controlling the generation and non-generation of the reaction force (in other words, whether or not expansion and contraction is possible) as the device itself. Therefore, a tilt lock mechanism is provided as a mechanism for controlling whether or not the tilting motion of the backrest 8 is possible. Then, in the present embodiment, the operation lever of the chair according to the present invention is applied to the rotation shaft included in the tilt lock mechanism (in other words, the rotation shaft included in the tilt lock mechanism relates to the present invention. Consists of the operating lever of the chair).

The tilt lock mechanism is a mechanism for fixing the backrest 8 to the initial position and releasing the fixing. That is, the tilt lock mechanism limits the rotation operation (specifically, the backward swing operation) of the synchro frame 10 that can rotate with respect to the main frame 1 using the rotation shaft 4 as the rotation support shaft. It controls the fixing of the posture of the backrest 8 attached to the synchro frame 10 and the release of the fixing (in other words, the limitation and the permissible of the tilting motion of the backrest 8). ..

Such a tilt lock mechanism is a reaction force applying device 12 that does not itself have a lock mechanism as in the present embodiment as a mechanism for exerting a reaction force on the synchro frame 10 that swings with respect to the main frame 1. Is a particularly useful mechanism in the case of the configuration mode in which.

The operating lever of the chair, which forms a part of the tilt lock mechanism in the present embodiment, is a frame portion which is a pair of members of the synchro frame 10 which is attached to the main frame 1 and supports the backrest 8 and which faces each other in the left-right direction. A tilt lock rotation shaft 13 that penetrates 10A and 10A in the left-right direction and is supported by the pair of frame portions 10A and 10A so as to be axially rotatable, and a pair of frame portions 10A among the tilt lock rotation shafts 13. It is attached to a section supported by 10A (in other words, a section sandwiched by a pair of frame portions 10A, 10A, and a section between these pair of frame portions 10A, 10A), and the tilt lock rotation shaft 13 It has a tension member 14 which is an action member that rotates with rotation of the shaft and controls whether or not the synchro frame 10 can swing with respect to the main frame 1, and at least a pair of frames of the tilt lock rotation shaft 13. The section supported by the portions 10A and 10A is made to have a straight rod shape.

In the example shown in the figure, the tilt operation lever 15 is fixedly attached to one end of the tilt lock rotation shaft 13 (however, the tilt operation lever 15 is not shown in FIG. 7).

The tilt lock rotation shaft 13 penetrates the holes 10f formed at the front end positions of the cross-linked portions 10C of the pair of frame portions 10A and 10A facing each other in the left-right direction of the synchro frame 10 in the left-right direction to synchronize. It is rotatably supported by the frame 10.

Here, in the present invention, the section of the tilt lock rotation shaft 13 supported by the pair of facing frame portions 10A, 10A (in other words, the section sandwiched by the pair of facing frame portions 10A, 10A). The portion corresponding to / corresponding to the pair of frame portions 10A, 10A facing each other) is a straight line, that is, a straight rod shape. Then, in the present embodiment, a single straight rod-shaped metal wire is used as the tilt lock rotation shaft 13.

The feature of the present invention is that, as described above, the portion of the tilt lock rotation shaft 13 corresponding to and corresponding to the section supported by the pair of opposite frame portions 10A and 10A is a straight rod shape. The part may be curved or bent. Specifically, for example, one end of the tilt lock rotation shaft 13 extending to the outside of the pair of frame portions 10A and 10A facing each other is bent forward, backward, and the like, and the bent portion is bent. The portion may be used as an operating lever as it is, or a component for the operating lever may be attached to the bent portion.

The tension member 14 is attached to a portion of the tilt lock rotation shaft 13 sandwiched between the pair of left and right frame portions 10A and 10A.

The tension member 14 swings with the tilt lock rotation shaft 13 as a rotation support shaft, and is interposed between the main frame 1 and the synchro frame 10 as a support, and the synchro frame 10 swings with respect to the main frame 1. The synchro frame 10 is operated so as to be able to prevent the synchro frame 10 from oscillating.

The tension member 14 includes a shaft penetrating portion 14a in which a through hole 14d is formed so as to penetrate the tilting lock rotating shaft 13 and is attached to the tilting lock rotating shaft 13, and a plurality of shaft penetrating portions 14a for reinforcement. It has a plate-shaped abutment portion 14b having a rib and extending from the shaft penetrating portion 14a.

The material of the tension member 14 may be one that is interposed between the main frame 1 and the synchro frame 10 and can exhibit enough strength to function as a support against the swing of the synchro frame 10. For example, it is not limited to a specific type, and an appropriate one is appropriately selected. Specifically, the tension member 14 is formed of, for example, resin or metal. In this embodiment, the tension member 14 is made of resin.

The tilt lock mechanism of the present embodiment also has a structure that restricts the movement of the tension member 14 in the axial direction of the tilt lock rotation shaft 13, in the axial direction of the tilt lock rotation shaft 13 of the tension member 14. Both side surfaces of the synchro frame 10 are slidably sandwiched by a pair of left and right frame portions 10A and 10A of the synchro frame 10.

In the tilt lock mechanism of the present embodiment, the tension member 14 is provided with a through hole 14d for penetrating the tilt lock rotation shaft 13, and a key groove 14e is formed on the inner peripheral surface of the through hole 14d. The tilt lock rotation shaft 13 is provided with a key 13a which is a protrusion formed on the outer peripheral surface by crushing, and the key 13a of the tilt lock rotation shaft 13 inserted into the through hole 14d of the tension member 14 protrudes. By engaging with the key groove 14e of the tension member 14, the tension member 14 rotates and swings as the tilt lock rotation shaft 13 rotates.

That is, the tension member 14 rotates the tilt lock so that when the tilt lock rotation shaft 13 rotates, the tension lock rotation shaft 13 follows the tilt lock rotation shaft 13 without sliding and rotates in conjunction with the tilt lock rotation shaft 13. It is attached to the shaft 13.

Specifically, an axial key 13a is formed integrally with the tilt lock rotation shaft 13 as a rail-shaped convex portion on the outer peripheral surface of the tilt lock rotation shaft 13. In the example shown in the figure, a pair of keys 13a, 13a are formed on the outer peripheral surface of the tilt lock rotation shaft 13 at positions facing each other in the radial direction. The key 13a is formed by crushing a metal wire (bar) constituting the tilt lock rotation shaft 13.

Further, an axial key groove 14e into which the key 13a is fitted is formed at each of the positions facing each other in the radial direction on the inner peripheral surface of the through hole 14d of the tension member 14.

According to the above-mentioned structure, the tilt lock rotation shaft 13 and the tension member 14 are connected to each other so that the shaft cannot rotate by fitting and engaging the key 13a and the key groove 14e.

The key 13a passes through the frame portion 10A of the synchro frame 10 and collides with the synchro frame 10 (specifically, between the pair of left and right frame portions 10A and 10A) with the tension member 14 arranged. In order to allow the tilt lock rotation shaft 13 to be inserted so as to reach the through hole 14d of the tension member 14, the synchro frame 10 is formed in the frame portion 10A on the side where the tilt lock rotation shaft 13 is inserted. A notch for passing the key 13a is formed at a position corresponding to the key 13a in the peripheral edge of the hole 10f.

The mode of coupling between the tilt lock rotation shaft 13 and the tension member 14 is not limited to the mode in which the key 13a and the key groove 14e are fitted and engaged with each other, and are coupled by another method. You may do so. Further, when the tension member 14 is formed of metal, the tilt lock rotation shaft 13 and the tension member 14 may be joined by welding.

In the tilt lock mechanism of the present embodiment, the key groove 14e formed on the inner peripheral surface of the through hole 14d of the tension member 14 is further provided with the tension member abutting portion 14g on one end surface side of the through hole 14d. Further, the tilt lock rotation shaft 13 further includes a protrusion 13b formed on the outer peripheral surface by crushing, and the key 13a of the tilt lock rotation shaft 13 inserted into the through hole 14d of the tension member 14 is a tension member. The movement of the tilt lock rotation shaft 13 in the axial direction is restricted by abutting the tension member abutting portion 14g of the key groove 14e of 14 and locking the protrusion 13b of the tilt lock rotation shaft 13 with the synchro frame 10. I am trying to do it.

The axial keyway 14e formed in the strut member 14 is open (in other words, open) at one end surface (that is, the opening surface) of the through hole 14d, while the other end surface. Not open to (in other words, not open). That is, the key groove 14e is formed in a range from one end face of the through hole 14d to the front of the other end face with respect to the inner peripheral surface of the through hole 14d. The portion where the key groove 14e is a dead end so as not to open (do not open) with respect to the other end surface is referred to as a strut member abutting portion 14g.

Then, the tilt lock rotation shaft 13 aligns the positions of the key 13a and the key groove 14e from one end surface of the through hole 14d of the tension member 14 (that is, the end surface on which the key groove 14e is open). It is inserted and inserted. The key 13a enters the key groove 14e, advances in the key groove 14e, and abuts on the strut member abutting portion 14g.

When the key 13a abuts on the strut member abutting portion 14g, the movement in the direction in which the tilt lock rotation shaft 13 is inserted into the through hole 14d of the strut member 14 is restricted.

Further, a protrusion 13b is formed integrally with the tilt lock rotation shaft 13 between the key 13a and the tilt operation lever 15 on the outer peripheral surface of the tilt lock rotation shaft 13. In the example shown in the figure, a pair of protrusions 13b, 13b are formed on the outer peripheral surface of the tilt lock rotation shaft 13 at positions facing each other in the radial direction. The protrusion 13b is formed by crushing a metal wire (bar) constituting the tilt lock rotation shaft 13.

Then, the tilt lock rotation shaft 13 is stretched by the protrusion 13b being locked to the outer surface of the peripheral edge of the hole 10f formed in the frame portion 10A of the synchro frame 10 and through which the tilt lock rotation shaft 13 penetrates. The movement in the direction of being inserted into the through hole 14d of 14 is further restricted. If necessary, washers and spacers may be arranged so as to be interposed between the outer surface of the frame portion 10A and the protrusions 13b.

A portion of the tilt lock rotation shaft 13 that is inserted from one of the pair of left and right frame portions 10A and 10A, penetrates the tension member 14, and protrudes from the other frame portion 10A. By providing the push nut (not shown), the movement in the direction in which the tilt lock rotation shaft 13 is pulled out from the through hole 14d of the tension member 14 is restricted.

As described above, the strut members 14 are positioned at predetermined positions with respect to the synchro frame 10 by sandwiching both side surfaces of the strut members 14 in the left-right direction between the pair of left and right frame portions 10A and 10A of the synchro frame 10. It is arranged and positioned, and the lateral movement of the tension member 14 with respect to the synchro frame 10 is restricted. According to this configuration, a structure is realized in which the tension member 14 is arranged and positioned at a predetermined position with respect to the synchro frame 10 without the need for a separate member used in combination with the synchro frame 10. ..

Further, the left and right side surfaces of the synchro frame 10 are sandwiched between the pair of left and right frame portions 10A and 10A, so that the movement of the tension member 14 in the left-right direction with respect to the synchro frame 10 is restricted, and the tension member 14 is further restricted. The key 13a abuts on the strut member abutting portion 14g formed at the end of the key groove 14e, and the protrusion 13b is locked to the frame portion 10A of the synchro frame 10 and is inserted and prevented from coming off on the protruding side. By providing the push nut of the above, the movement of the tilt lock rotation shaft 13 with respect to the synchro frame 10 in the left-right direction is restricted. According to this configuration, the movement in the left-right direction with respect to the synchro frame 10 is restricted at the same time as the tension member 14 and the tilt lock rotation shaft 13 are assembled to the synchro frame 10 without the need for welding or screwing. On top of that, a structure is realized in which the tilt lock rotation shaft 13 and the tension member 14 are arranged with respect to the synchro frame 10.

Further, the key groove 14e formed in the through hole 14d of the tension member 14 and the key 13a formed by crushing the tilt lock rotation shaft 13 engage with each other to stretch the tilt lock rotation shaft 13 with respect to the tilt lock rotation shaft 13. The rotation of the member 14 is restricted. According to this configuration, rotation with respect to the tilt lock rotation shaft 13 is restricted at the same time as the tension member 14 and the tilt lock rotation shaft 13 are assembled to the synchro frame 10 without the need for welding or screwing. A structure is realized in which the tension member 14 is attached to the tilt lock rotation shaft 13.

As the tilt lock rotation shaft 13 supported by the synchro frame 10 rotates, the abutting portion 14b of the plate form of the tension member 14 becomes an inclined posture or a vertical posture. Here, the tilted posture is a state in which the abutting portion 14b is tilted with respect to the upper surface of the top plate portion 1A of the main frame 1, and the vertical posture is a state in which the top plate portion 1A of the main frame 1 is tilted. On the other hand, the abutting portion 14b is in a vertical state. Note that, for example, FIGS. 3 to 7 show a state in which the abutting portion 14b of the tension member 14 is in an inclined posture.

When the abutting portion 14b is in an inclined posture, a space is secured between the strut member 14 and the upper surface of the top plate portion 1A of the main frame 1, and the abutting portion 14b when the synchro frame 10 swings. Is not an obstacle, and the synchro frame 10 can swing with respect to the main frame 1.

On the other hand, when the abutting portion 14b is in the vertical posture, the lower end surface 14c of the abutting portion 14b (that is, the end surface opposite to the side connecting with the shaft penetrating portion 14a) is the upper surface of the top plate portion 1A of the main frame 1. The abutting portion 14b acts as a supporting plate (abuting rod), and the abutting portion 14b becomes an obstacle when the synchro frame 10 swings, so that the synchro frame 10 is in contact with the main frame 1. Becomes unable to swing.

That is, the synchro frame 10 can be rotated and the backrest 8 can be tilted backward only by rotating the tilt lock rotation shaft 13 (in the example shown in the figure, the tilt operation lever 15 is swung). The state is switched between the state in which the synchro frame 10 is non-rotatable and the backrest 8 is fixed at the initial position and cannot be tilted backward.

A hemisphere that projects toward the frame portion 10A of the synchro frame 10 (that is, toward the outside in the left-right direction) on the outer side surface of the side wall provided at the end portion of the shaft penetrating portion 14a of the tension member 14 in the left-right direction. A shaped protrusion 14f is formed.

Further, the protrusion 14f of the tension member 14 is caught on the side surface of the frame portion 10A of the synchro frame 10 facing the left and right side surfaces of the shaft penetration portion 14a of the tension member 14 (that is, the inner side surface in the left-right direction). Two recesses 10h and 10h are formed.

One of the two recesses 10h and 10h, the recess 10h, is formed at a position facing the protrusion 14f when the abutting portion 14b of the strut member 14 is in an inclined posture, and the other recess 10h is a strut member 14 The abutting portion 14b is formed at a position facing the abutting portion 14f when it is in a vertical posture.

The tension member 14 including the protrusion 14f and the synchro frame 10 including the two recesses 10h and 10h are the tension members when the tension member 14 rotates due to the axial rotation of the tilt lock rotation shaft 13. The protrusion 14f of the 14 may slide on the inner side surface of the frame portion 10A of the synchro frame 10, and the protrusion 14f may enter the recess 10h and be caught, or may be operated by a seated person with a certain force. The protrusion 14f and the two recesses 10h are arranged so as to be mutually adjusted so that the protrusion 14f can come out of the recess 10h when the tilt lock rotation shaft 13 is about to rotate. 10h is formed.

Then, the protrusion 14f enters the recess 10h and is caught, so that the protrusion 14b is maintained in the tilted posture until the tilt lock rotation shaft 13 is subsequently operated by the seated person with a certain force. Or it is maintained in a vertical position.

The protrusion 14f on the tension member 14 side and the two recesses 10h and 10h on the synchro frame 10 side maintain the abutting portion 14b of the tension member 14 in an inclined posture or a vertical posture, so that the backrest 8 The trouble of having to operate the tilting operation lever 15 every time the tilting operation lever 15 is tilted backward is avoided, and the danger that the backrest 8 fixed at the initial position is unexpectedly tilted backward is prevented. ..

The protrusion 14f and the two recesses 10h and 10h are provided in combination with one side of the left and right sides of the shaft penetration portion 14a and the side surface of the frame portion 10A facing the one side (that is, only one in the left-right direction). Alternatively, it may be provided in combination with the left and right sides of the shaft penetrating portion 14a and the side surfaces of the frame portion 10A facing each of these both sides (that is, both in the left-right direction).

The tension member 14 further functions as a stopper that limits the maximum tilt angle at which the synchro frame 10 can rotate backward and, by extension, determines the maximum backward tilt posture of the backrest 8.

A pair of left and right dampers 1j and 1j are provided at positions near the rear end of the top plate portion 1A of the main frame 1 so that the tension member 14 also functions as a stopper.

Then, when the abutting portion 14b of the tension member 14 is in an inclined posture (that is, the synchro frame 10 is rotatable and the backrest 8 can be tilted backward), the backrest 8 is gradually tilted backward. , The plate surface (specifically, the rear surface) of the abutting portion 14b abuts (in other words, abuts) the pair of left and right dampers 1j and 1j of the main frame 1, so that the rearward tilt of the backrest 8 is restricted. That is, the maximum backward tilt angle of the backrest 8 is limited.

The abutting portion 14b of the tension member 14 has a plate surface (rear surface; in other words, at this time) when the synchro frame 10 has a maximum inclination angle and abuts (abuts) on the dampers 1j and 1j of the main frame 1. In the state, the angle of the tilted posture is adjusted so that the lower surface) faces the upper surface of the top plate portion 1A of the main frame 1 and is parallel to each other.

As described above, the synchro frame 10 is controlled by the tension member 14 to be able to swing or the maximum inclination angle is limited. Therefore, the main frame 1 is connected to the tension member 14 via the tension member 14. At the part where 14 abuts and abuts, the load is applied when the backrest 8 is prohibited from tilting backward or when the back tilt is stopped. Therefore, in order to deal with the prohibition of tilting of the backrest 8 and the backward tilt stop (in other words, to receive it). The parts that require strength are concentrated in a limited range, and it becomes possible to streamline the strength design of the mainframe 1.

According to the tilt lock mechanism including the tilt lock rotation shaft 13 which is the operation lever configured as described above and the chair provided with the tilt lock mechanism, the pair of side wall portions 1B and 1B of the tilt lock rotation shaft 13 Since the part supported by is made to be a straight rod shape, there is no need for complicated design, laborious processing or complicated mechanism, and the thrust between the main frame 1 and the synchro frame 10 is not required. As a support, the tension member 14 can be made to work or not, and the synchro frame 10 can be switched between a swingable state and a non-swingable state, and the backrest 8 can be tilted. It is possible to realize a structure that switches between a certain state and a state in which it cannot tilt. Therefore, it is possible to improve the efficiency of designing and manufacturing the tilt lock mechanism for the backrest of the chair, and it is possible to improve the versatility of the tilt lock mechanism for the backrest of the chair.

Further, an elevating lock mechanism is provided as a mechanism for controlling whether or not the seat 7 can be elevated. Then, in the present embodiment, the operation lever of the chair according to the present invention is applied to the rotating shaft included in the elevating lock mechanism (in other words, the rotating shaft included in the elevating lock mechanism relates to the present invention. Consists of the operating lever of the chair).

The elevating lock mechanism is a mechanism for fixing the seat 7 at a desired height position and releasing the fixing. That is, the elevating lock mechanism uses the lock mechanism of the gas spring constituting the pedestal 9a to limit or allow the expansion / contraction operation of the gas spring, thereby limiting or allowing the pedestal 9a (specifically, gas). It controls the fixing of the height of the seat 7 attached to the piston rod of the spring) and the release of the fixing (in other words, the restriction and the permissible movement of the seat 7).

The operating levers of the chairs that form part of the elevating lock mechanism in the present embodiment are a pair of main frames 1 that are attached to the upper end of the telescopic pedestal 9a and support the seat 7 and face each other in the left-right direction. An elevating lock rotating shaft 21 that penetrates the side wall portions 1B and 1B, which are members, and is supported by the pair of side wall portions 1B and 1B so as to be axially rotatable, and a pair of the elevating lock rotating shafts 21. It is attached to the section supported by the side wall portions 1B, 1B (in other words, the section sandwiched by the pair of side wall portions 1B, 1B, and the section between the pair of side wall portions 1B, 1B) and the elevating lock. It has a pressing member 22 which is an acting member for operating a push valve 9e which is a mechanism for controlling the possibility of expansion and contraction provided at the top of the pedestal 9a by rotating with the rotation of the rotating shaft 21. The section supported by at least a pair of side wall portions 1B and 1B of the elevating lock rotation shaft 21 is formed to have a straight rod shape.

In the example shown in the figure, the elevating operation lever 23 is fixedly attached to one end of the elevating lock rotation shaft 21.

The elevating lock rotation shaft 21 is a through hole (not shown in the drawing) of the bottom plate portion 1C and a leg of the top plate portion 1A of each of the pair of side wall portions 1B and 1B facing each other in the left-right direction of the main frame 1. It penetrates the hole 1h formed at the position closest to the front of the column support hole 1e in the left-right direction, and is supported by the main frame 1 so as to be axially rotatable.

Here, in the present invention, the section of the elevating lock rotation shaft 21 supported by the pair of side wall portions 1B, 1B facing each other (in other words, the section sandwiched by the pair of side wall portions 1B, 1B facing each other). The portion corresponding to / corresponding to the pair of side wall portions 1B, 1B facing each other) is a straight line, that is, a straight rod shape. Then, in the present embodiment, a straight rod-shaped metal wire is used as the elevating lock rotation shaft 21.

As described above, the feature of the present invention is that the portion corresponding to and corresponding to the section supported by the pair of side wall portions 1B and 1B facing each other in the elevating lock rotation shaft 21 is a straight rod shape. The part may be curved or bent. Specifically, for example, one end of the elevating lock rotation shaft 21 extending to the outside of the pair of side wall portions 1B and 1B facing each other is bent forward, backward, and the like, and is bent. The portion may be used as an operating lever as it is, or a component for the operating lever may be attached to the bent portion.

The pressing member 22 is attached to a portion of the elevating lock rotating shaft 21 sandwiched between the pair of left and right side wall portions 1B and 1B.

The pressing member 22 swings with the elevating lock rotation shaft 21 as a rotation support shaft, and pushes or releases the push valve 9e provided at the tip of the piston rod of the gas spring constituting the pedestal 9a. It works as if it could be done.

The pressing member 22 is formed in a hook shape in a side view with a shaft penetrating portion 22a in which a through hole 22c is formed so as to penetrate the elevating lock rotating shaft 21 and be attached to the elevating lock rotating shaft 21. It has an operating portion 22b extending from the shaft penetrating portion 22a.

The material of the pressing member 22 is not limited to a specific type as long as it can exhibit strength enough to press the push valve 9e when swinging, and an appropriate material is appropriately selected. Will be done. Specifically, the pressing member 22 is formed of, for example, resin or metal. The pressing member 22 is made of resin in this embodiment.

The elevating lock mechanism of the present embodiment also has a structure that restricts the movement of the pressing member 22 in the axial direction of the elevating lock rotating shaft 21, and both sides of the pressing member 22 in the axial direction of the elevating lock rotating shaft 21. The surface is slidably sandwiched by the groove portion 1f formed in the main frame 1.

Specifically, the top plate portion 1A of the main frame 1 is cut forward continuously with the front end of the opening in the top plate portion 1A of the pedestal support hole 1e (in other words, backward in a plan view). A groove 1f (rectangular) that opens to form a continuous opening of the pedestal support hole 1e. The groove portion 1f and the elevating lock rotation shaft 21 are arranged and formed so as to have the same position in the front-rear direction, that is, to overlap each other in a plan view.

The groove portion 1f is formed as an opening for projecting the operation portion 22b above the top plate portion 1A while slidably sandwiching both side surfaces of the pressing member 22 attached to the elevating lock rotation shaft 21 in the left-right direction. ..

Then, the pressing member 22 is attached to a portion of the elevating lock rotating shaft 21 provided on the main frame 1 below the groove portion 1f.

In the elevating lock mechanism of the present embodiment, the pressing member 22 is provided with a through hole 22c for penetrating the elevating lock rotation shaft 21, and a key groove 22d is formed on the inner peripheral surface of the through hole 22c. The elevating lock rotating shaft 21 is provided with a key 21a which is a protrusion formed on the outer peripheral surface by crushing, and the key 21a of the elevating lock rotating shaft 21 inserted into the through hole 22c of the pressing member 22 is the pressing member 22. By engaging with the key groove 22d of the above, the pressing member 22 rotates and swings with the shaft rotation of the elevating lock rotation shaft 21.

That is, the pressing member 22 follows the elevating lock rotation shaft 21 without sliding when the elevating lock rotation shaft 21 rotates, and rotates in conjunction with the elevating lock rotation shaft 21. Attached to 21.

Specifically, an axial key 21a is formed integrally with the elevating lock rotating shaft 21 as a rail-shaped convex portion on the outer peripheral surface of the elevating lock rotating shaft 21. In the example shown in the figure, a pair of keys 21a and 21a are formed at positions facing each other in the radial direction on the outer peripheral surface of the elevating lock rotation shaft 21. The key 21a is formed by crushing a metal wire (bar) constituting the elevating lock rotation shaft 21.

Further, an axial key groove 22d into which the key 21a is fitted is formed at each of the positions facing each other in the radial direction on the inner peripheral surface of the through hole 22c of the pressing member 22.

According to the above-mentioned structure, the elevating lock rotating shaft 21 and the pressing member 22 are connected to each other so that the shaft cannot rotate by engaging the key 21a and the key groove 22d in a fitting manner.

The elevating lock is provided so that the key 21a passes through the side wall portion 1B of the main frame 1 and reaches the through hole 22c of the pressing member 22 in a state where the pressing member 22 is arranged with respect to the main frame 1 (particularly the groove portion 1f). Corresponds to the key 21a of the peripheral edge of the hole 1h formed in the side wall 1B on the side of the main frame 1 where the elevating lock rotation shaft 21 is inserted so that the rotation shaft 21 can be inserted. A notch is formed at the position for the key 21a to pass through.

The mode of coupling between the elevating lock rotation shaft 21 and the pressing member 22 is not limited to the mode in which the key 21a and the key groove 22d are fitted and engaged with each other, and may be coupled by another method. You can do it. Further, when the pressing member 22 is made of metal, the elevating lock rotating shaft 21 and the pressing member 22 may be joined by welding.

In the elevating lock mechanism of the present embodiment, the key groove 22d formed on the inner peripheral surface of the through hole 22c of the pressing member 22 is further provided with the pressing member abutting portion 22e on one end surface side of the through hole 22c. The elevating lock rotating shaft 21 further includes a protrusion 21b formed on the outer peripheral surface by crushing, and the key 21a of the elevating lock rotating shaft 21 inserted into the through hole 22c of the pressing member 22 is a key groove of the pressing member 22. The movement of the elevating lock rotating shaft 21 in the axial direction is restricted by hitting the pressing member abutting portion 22e of 22d and locking the protrusion 21b of the elevating lock rotating shaft 21 with the main frame 1. ..

The axial keyway 22d formed in the pressing member 22 is open (in other words, open) at one end surface (that is, the opening surface) of the through hole 22c, while at the other end surface. On the other hand, it is not open (in other words, it is not open). That is, the key groove 22d is formed in a range from one end surface of the through hole 22c to the front of the other end surface with respect to the inner peripheral surface of the through hole 22c. The portion where the key groove 22d is a dead end so as not to open (do not open) with respect to the other end surface is called a pressing member abutting portion 22e.

Then, the elevating lock rotation shaft 21 is aligned with the key 21a and the key groove 22d from one end surface of the through hole 22c of the pressing member 22 (that is, the end surface on which the key groove 22d is open). Can be inserted. The key 21a enters the key groove 22d, advances in the key groove 22d, and abuts on the pressing member abutting portion 22e.

When the key 21a abuts against the pressing member abutting portion 22e, the movement in the direction in which the elevating lock rotating shaft 21 is inserted into the through hole 22c of the pressing member 22 is restricted.

Further, a protrusion 21b is formed integrally with the elevating lock rotating shaft 21 between the key 21a and the elevating operation lever 23 on the outer peripheral surface of the elevating lock rotating shaft 21. In the example shown in the figure, a pair of protrusions 21b and 21b are formed on the outer peripheral surface of the elevating lock rotation shaft 21 at positions facing each other in the radial direction. The protrusion 21b is formed by crushing a metal wire (bar) constituting the elevating lock rotation shaft 21.

Then, the elevating lock rotating shaft 21 is pressed by the elevating lock rotating shaft 21 by locking the protrusion 21b on the outer surface of the peripheral edge of the hole 1h formed on the side wall portion 1B of the main frame 1 and through which the elevating lock rotating shaft 21 penetrates. The movement in the direction of being inserted into the through hole 22c of the is further restricted. If necessary, the washer or spacer may be arranged so as to be interposed between the outer surface of the side wall portion 1B and the protrusion 21b.

In addition, it is inserted from one side wall portion 1B of the pair of left and right side wall portions 1B and 1B, penetrates the pressing member 22, and protrudes from the other side wall portion 1B to a portion near the tip of the elevating lock rotation shaft 21. By providing a push nut (not shown), the movement in the direction in which the elevating lock rotation shaft 21 is pulled out from the through hole 22c of the pressing member 22 is restricted.

As described above, the pressing member 22 is positioned at a predetermined position with respect to the main frame 1 by sandwiching both side surfaces of the pressing member 22 in the left-right direction in the groove portion 1f formed in the top plate portion 1A of the main frame 1. It is arranged and positioned, and the movement of the pressing member 22 with respect to the main frame 1 in the left-right direction is restricted. According to this configuration, a structure is realized in which the pressing member 22 is arranged and positioned at a predetermined position with respect to the main frame 1 without the need for a separate member used in combination with the main frame 1.

Further, the left and right side surfaces are sandwiched between the groove portions 1f formed in the top plate portion 1A of the main frame 1, so that the movement of the pressing member 22 in the left-right direction with respect to the main frame 1 is restricted, and then the pressing member 22 The key 21a abuts on the pressing member abutting portion 22e formed at the end of the key groove 22d, the protrusion 21b is locked to the side wall portion 1B of the main frame 1, and the protrusion 21b is inserted and prevented from coming off on the protruding side. By providing the push nut, the movement of the elevating lock rotation shaft 21 with respect to the main frame 1 in the left-right direction is restricted. According to this configuration, the movement in the left-right direction with respect to the main frame 1 is restricted at the same time as the pressing member 22 and the elevating lock rotating shaft 21 are assembled to the main frame 1 without the need for welding or screwing. Above, a structure is realized in which the elevating lock rotating shaft 21 and the pressing member 22 are arranged with respect to the main frame 1.

Further, the key groove 22d formed in the through hole 22c of the pressing member 22 and the key 21a formed by crushing the elevating lock rotating shaft 21 engage with each other to press the elevating lock rotating shaft 21 against the elevating lock rotating shaft 21. Rotation is restricted. According to this configuration, rotation with respect to the elevating lock rotating shaft 21 is restricted at the same time as the pressing member 22 and the elevating lock rotating shaft 21 are assembled to the main frame 1 without the need for welding or screwing. Above, a structure is realized in which the pressing member 22 is attached to the elevating lock rotating shaft 21.

The pressing member 22 is in a posture in which the shaft penetrating portion 22a is on the front side and the operating portion 22b extends backward from the shaft penetrating portion 22a, and the operating portion 22b passes through the groove portion 1f formed in the main frame 1. Then, in a state where the tip end portion (that is, the rear end portion) is located above the top portion of the pedestal 9a, the elevating lock rotation shaft 21 is provided through the shaft penetration portion 22a.

When the elevating lock rotation shaft 21 supported by the main frame 1 rotates, the operation portion 22b of the pressing member 22 swings along the vertical plane in the front-rear direction, and the piston of the gas spring forming the pedestal 9a. The push valve 9e at the tip of the rod is pressed or released.

In the example shown in the figure, the operation feeling of the pressing member 22 when the operating portion 22b presses the push valve 9e on the lower surface of the tip portion (that is, the rear end portion) of the operating portion 22b is smooth and light. A hemispherical protrusion 22f is formed for this purpose.

Then, when the push valve 9e of the pedestal 9a is pressed by the operating portion 22b of the pressing member 22, the gas spring constituting the pedestal 9a becomes expandable and contractible.

On the other hand, when the push valve 9e of the pedestal 9a is not pressed by the operating portion 22b of the pressing member 22, the gas spring constituting the pedestal 9a becomes inextensible.

That is, the pedestal 9a can be expanded and contracted and the seat 7 can be raised and lowered only by rotating the lift lock rotation shaft 21 (in the example shown in the figure, the lift operation lever 23 is swinged). The state in which the pedestal 9a cannot be expanded and contracted and the seat 7 is fixed at an appropriate height position and cannot be raised or lowered is switched.

According to the elevating lock mechanism including the elevating lock rotating shaft 21 which is the operation lever configured as described above and the chair provided with the elevating lock mechanism, the pair of frame portions 10A and 10A of the elevating lock rotating shaft 21 Since the part supported by is made to be a straight rod shape, it is a mechanism to control the expansion and contraction of the pedestal 9a without the need for complicated design, laborious processing and complicated mechanism. A structure is realized in which a push valve 9e is operated to switch between a state in which the pedestal 9a can be expanded and contracted and a state in which the pedestal 9a cannot be expanded and contracted, and by extension, a state in which the seat 7 can be raised and lowered and a state in which it cannot be raised and lowered can be switched. can do. Therefore, it is possible to improve the efficiency of designing and manufacturing the elevating lock mechanism of the chair seat, and it is possible to improve the versatility of the elevating lock mechanism of the chair seat.

Although the above-described embodiment is an example of a preferred embodiment of the present invention, the embodiment of the present invention is not limited to the above-mentioned embodiment, and the present invention is not limited to the above-described embodiment. The invention can be modified in various ways.

For example, in the above-described embodiment, the present invention is applied to a chair whose overall configuration is shown in FIGS. 1 and 2, but specific modes and shapes of the chair to which the present invention can be applied are described in the above-described embodiment. It is not limited to the one in the form, and is appropriately selected based on the purpose and design of the chair. Specifically, for example, in the above-described embodiment, the legs 9 are so-called rotating legs having casters 9c at the tips of the five leg blades 9b that radiate out. The embodiment is not limited to the rotating leg provided with casters, and may be, for example, a fixed leg.

Further, in the above-described embodiment, the present invention is applied to a chair whose overall configuration is as shown in FIGS. 1 and 2 and whose structure of a portion related to the present invention is as shown in FIGS. 3 and 4. However, the specific shapes and modes of the constituent members such as the main frame 1, the seat member 7A, and the synchro frame 10 to which the present invention can be applied are limited to those in the above-described embodiment. Rather, an appropriate chair is appropriately selected based on the purpose and design of the chair. Specifically, for example, in the above-described embodiment, the locking mechanism including the main frame 1 is configured so that the backrest 8 and the seat 7 perform the locking operation in conjunction with each other. It can also be applied to chairs in which the seats 7 are not interlocked with each other and each independently performs a locking operation. Further, in the above-described embodiment, the elevating lock rotating shaft 21 is arranged in the left-right direction, but the elevating lock rotating shaft 21 may be arranged in the front-rear direction.

Further, in the above-described embodiment, the pair of opposing members that support the tilt lock rotation shaft 13 are the pair of frame portions 10A and 10A of the synchro frame 10, and the pair of facing members that support the elevating lock rotation shaft 21 are opposed to each other. The pair of members are a pair of side wall portions 1B and 1B of the main frame 1. However, the pair of opposing members that support the tilt lock rotation shaft 13 do not have to be the pair of frame portions 10A and 10A of the synchro frame 10, and the pair of opposing members that support the elevating lock rotation shaft 21. Does not have to be the pair of side wall portions 1B and 1B of the main frame 1, so that the tilt lock rotation shaft 13 and the elevating lock rotation shaft 21 are supported by another pair of opposing members. Is also good.

Further, in the above-described embodiment, the strut member 14 is positioned by slidably sandwiching both side surfaces of the strut member 14 in the left-right direction between a pair of left and right frame portions 10A and 10A of the synchro frame 10. The pressing member 22 is positioned by slidably sandwiching both side surfaces of the pressing member 22 in the left-right direction in the groove portion 1f formed in the main frame 1. However, the structure that limits the movement of the tension member 14 in the axial direction of the tilt lock rotation shaft 13 as in the above-described embodiment and the movement of the pressing member 22 in the axial direction of the elevating lock rotation shaft 21 are restricted. The structure is not an essential structure in the present invention, and the present invention may be applied without being combined with such a structure.

Further, in the above-described embodiment, the key 13a abuts on the strut member abutting portion 14g formed at the end of the key groove 14e of the strut member 14, and the protrusion 13b is locked to the frame portion 10A of the synchro frame 10. As a result, the movement in the direction in which the tilt lock rotation shaft 13 is inserted into the tension member 14 is restricted, or the pressing member abutting portion 22e formed at the end of the key groove 22d of the pressing member 22. When the key 21a abuts and the protrusion 21b is locked to the side wall portion 1B of the main frame 1, the movement in the direction in which the elevating lock rotation shaft 21 is inserted into the pressing member 22 is restricted. However, the tilt lock rotation shaft 13 is tilted only by the key 13a abutting against the strut member abutting portion 14g, or by locking the protrusion 13b to the frame portion 10A. The movement of the lock rotation shaft 13 in the axial direction is restricted, or the movement of the elevating lock rotation shaft 21 in the axial direction is restricted only by the key 21a abutting against the pressing member abutting portion 22e. The movement of the elevating lock rotation shaft 21 in the axial direction may be restricted only by locking the protrusion 21b to the side wall portion 1B.

1 Main frame 1A Top plate 1B Side wall 1C Bottom plate 4 Rotating shaft 5 Seat front support shaft 6 Seat rear support shaft 7 Seat 8 Backrest 9 Leg body 9a Leg pillar 9b Leg blade 9c Castor 9d Foot pillar bracket 9e Push valve 10 Synchro frame 12 Reaction force applying device 13 Tilt lock rotation shaft 14 Strut member 15 Tilt operation lever 21 Lifting lock rotation shaft 21a Key 21b Protrusion 22 Pressing member 22a Shaft penetration 22b Operation part 22c Through hole 22d Key groove 22e Pressing Member abutment part 22f Protrusion part 23 Lifting operation lever

Claims (5)

A rotating shaft that penetrates a pair of opposing members in a direction in which the pair of members face each other and is rotatably supported by the pair of members, and is supported by the pair of members of the rotating shaft. It has a tension member that is attached to the section and rotates with the rotation of the rotation shaft to control the swing of the synchro frame with respect to the main frame .
Ri interval straight rod-like Der supported by at least the pair of members of said pivot shaft,
The tension member is provided with a through hole for penetrating the rotation shaft, a groove is formed on the inner peripheral surface of the through hole, and the groove is provided with a bumping portion on one end surface side of the through hole. Further, the rotating shaft is provided with a protrusion formed on the outer peripheral surface by crushing, and the protrusion of the rotating shaft inserted into the through hole of the tension member is the groove of the tension member. By engaging with the abutment portion and abutting against the abutting portion, the tension member rotates with the shaft rotation of the rotation shaft, and the movement of the rotation shaft in the axial direction is restricted. /> The operation lever of the chair. The operating lever for a chair according to claim 1, wherein a structure for restricting the movement of the tension member in the axial direction of the rotating shaft is provided. A rotating shaft that penetrates a pair of opposing members in a direction in which the pair of members face each other and is rotatably supported by the pair of members, and is supported by the pair of members of the rotating shaft. It has a pressing member that is attached to the section and rotates with the rotation of the rotating shaft to open and close the push valve of the gas spring of the pedestal.
The section of the rotating shaft supported by at least the pair of members is a straight rod.
The pressing member is provided with a through hole for penetrating the rotation shaft, a groove is formed on the inner peripheral surface of the through hole, and the groove is provided with an abutting portion on one end surface side of the through hole. The rotating shaft is provided with a protrusion formed on the outer peripheral surface by crushing, and the protrusion of the rotating shaft inserted into the through hole of the pressing member engages with the groove of the pressing member. By matching and abutting against the abutting portion, the pressing member rotates with the axis rotation of the rotating shaft, and the movement of the rotating shaft in the axial direction is restricted. the operating lever of the chair child shall be the feature. The operating lever of the chair according to claim 3, wherein a structure for restricting the movement of the pressing member in the axial direction of the rotating shaft is provided . A chair comprising the operating lever of the chair according to any one of claims 1 to 4.