JP4293400B2 - Chair locking mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rocking mechanism for a chair that can be tilted by interlocking a seat plate and a backrest.
[0002]
[Prior art]
FIG. 5 shows a conventional configuration of a chair locking mechanism.
[0003]
In the figure, 2 is a pedestal. A seat plate receiving member 10 is attached to the upper end portion of the pedestal 2. A seat plate 20 is disposed above the seat plate receiving member 10. The front shaft 21 of the seat plate 20 is attached to the elongated hole 11 in the front portion of the seat plate receiving member 10 so as to be rotatable and movable in the front-rear direction.
[0004]
The seat plate receiving member 10 supports an intermediate portion of the backrest mounting member 30 that holds the backrest 40 so as to be rotatable about the rotation shaft 25. The rear portion of the backrest mounting member 30 is rotatably connected to the rear portion of the seat plate 10 via a connecting member 31. A compression spring 50 is interposed between the shaft member 35 at the front portion of the backrest mounting member 30 and the front portion of the seat plate receiving member 10. Further, between the back frame 39F joined to the rear portion of the backrest mounting member 30 and the rear portion of the seat plate receiving member 10, a gas spring 59S that can be fixed in any stretched state is interposed.
[0005]
Here, when the user of the chair sits deeply on the seat cushion 27 on the seat plate 20, the backrest 40 tilts backward about the rotation shaft 25, and the seat plate 20 keeps the vertical position of the front portion constant. The rear part compresses the compression spring 50 and sinks downward while moving backward while being held in the state. At this time, since the vertical position of the front portion of the seat plate 20 does not change, the seated person can get good sitting comfort without raising the knee position.
[0006]
On the other hand, when the seated person sits down and stands up from this posture, the seat plate 20 is moved forward by the elastic restoring force of the compression spring 50, the rear part is lifted upward, and the backrest 40 rises forward together with the backrest mounting member 30. To return to the initial state.
[0007]
In addition, by fixing the gas spring 59S in an appropriate expansion and contraction state, the seat plate 20 and the backrest 40 are prevented from returning to the initial state due to the restoring force of the compression spring 50, and are held in a desired posture.
[0008]
[Problems to be solved by the invention]
By the way, in the locking mechanism of the chair, the seat plate 20 and the backrest 40 are held in a desired posture using the gas spring 59S. However, since the gas spring 59S is expensive, the manufacturing cost of the entire chair increases. become. Further, since the gas spring 59S is filled with high-pressure gas, at the time of disposal, the gas spring 59S must be removed from the seat plate receiving member 10 and degassed by a specialist, which makes the disposal difficult. It is.
[0009]
An object of the present invention is to provide a chair locking mechanism that can be easily disposed of and can be manufactured at a low cost.
[0010]
[Means for Solving the Problems]
The seat plate receiving member is attached to the upper end portion of the pedestal, and the front portion of the seat plate disposed above the seat plate receiving member is rotatable to the front portion of the seat plate receiving member. It is attached to the seat plate receiving member so that it can move in the front-rear direction, and the middle part of the backrest mounting member that holds the backrest is supported so as to be pivotable about the rotation axis, and the rear part of this backrest mounting member is attached to the rear part of the seat plate. In the locking mechanism of the chair, which is rotatably connected and a compression spring is connected to the front part of the backrest mounting member via a shaft member,
A U-shaped support frame that is an independent member from the seat plate receiving member and is attached to the seat plate receiving member and has an upper end portion opened, and each rear end portion disposed in the support frame a plurality of friction plates which are pivotally connected to the front part of the backrest mounting member via the shaft member, and a support shaft supported by the friction formed plate through the long hole the support frame, the support shaft portion of the support frame as the friction plates and a plurality of friction pieces held in contact, a moving member movably held by the support shaft, and the friction plates the movable member each It presses the friction strip and a frictional engagement positionable locking release position is released operating portion and be mutually positioned and held at the locking position to frictionally engage and the friction plates and the friction piece Each component as a component is supported by the support frame. Frictional engagement means for each of the friction pieces are made of stainless steel with conjugated to and above the friction plate is made of synthetic resin containing glass fiber is provided,
Operation section, the support shaft of which the ends are pivotally connected at a selected position the support frame of the outer surface abuts positionable holding the moving member in the locking position the cam projecting outwardly from the support frame This is a chair locking mechanism comprising a member and an operation lever connected to the cam member.
[0011]
In such an invention, the user of the chair sits deeply on the seat plate to tilt the backrest backward, and the rear portion of the seat plate tilts downward, so as to hold the backrest and seat plate in that state. In this case, the cam member is rotated in a selected posture by using the operation lever of the friction engagement means, and the moving member is positioned and held at the locking position.
[0012]
Then, each friction plate and each friction piece are pressed and frictionally engaged by the moving member. Here, “friction engagement” means a state in which a large static frictional force is generated between each adjacent friction plate and each friction piece, and the friction plate and each friction piece cannot move relative to each other. (The same applies hereinafter). Thereby, rotation of a backrest attachment member will be controlled and a seat board and a backrest can be held in a desired position.
[0013]
The “selected posture” means a posture previously selected by a producer or the like (hereinafter the same). For example, when the selected posture of the cam member is a vertically upright posture as shown in FIGS. 3 and 4, the cam member is rotated by moving the operation lever up and down. . Further, when the selected posture of the cam member is a horizontally laid posture, the cam member is rotated by moving the operation lever in the front-rear direction. This selection posture can be changed as appropriate according to customer usage.
[0014]
Thus, since the seat plate and the backrest are held at desired positions by using the friction plates and the friction pieces, the manufacturing cost can be reduced as compared with the conventional example using the gas spring. In addition, since hazardous materials such as high-pressure gas are not used, they can be disposed of as general waste. Therefore, the disposal process is simple and the production cost can be kept low. In addition, since each friction plate, each friction piece, the moving member, the support shaft, and the operation portion constituting the friction engagement means are integrated via the support frame, assembly and removal can be easily performed. Further, since the constituent elements of the frictional engagement means are integrated, assembly and removal can be easily performed. Furthermore, by limiting each material of the friction plate and the friction piece as described above, it is possible to suppress the generation of noise and the like as well as excellent wear resistance and the generation of galling.
[0015]
According to a second aspect of the present invention, in addition to the first aspect of the invention, the friction plates and the friction pieces can be pressed in cooperation with the moving member held by the support shaft portion in the support frame. It is a rocking mechanism of a chair provided with a disc spring that can be released.
[0016]
In the case of such an invention, even if the machining accuracy error of the cam member is somewhat large, each friction plate and each friction piece are pressed by the elastic restoring force of the disc spring, so that each friction plate and each friction piece are more reliably secured. Can be frictionally engaged. Further, since the disc spring generates a large elastic restoring force with a small displacement, the installation space of the disc spring can be reduced. Therefore, the size can be easily reduced.
[0017]
According to a third aspect of the present invention, in addition to the first or second aspect of the invention, the long hole of each friction plate is a chair formed so as to be inclined with respect to a line connecting the support shaft and the shaft member. It is a locking mechanism.
[0018]
In such an invention, when the moving member is positioned and held at the locking position and the friction plates and the friction pieces are frictionally engaged, the support shaft is strongly pressed against the long holes of the friction plates. Therefore, a large friction force is generated between the support shaft and each friction plate, and the rotation of each friction plate is also prevented by the friction force. Thereby, a seat board and a backrest can be hold | maintained in a desired position more reliably.
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0019]
As shown in FIGS. 1 to 4, the basic structure of the chair locking mechanism according to the present invention is the same as that of the conventional example (FIG. 5), but a plurality of friction plates 65, a support shaft, A plurality of friction pieces 75 held on the support shaft 71 so as to be frictionally engageable with the respective friction plates 65, and an operation portion 81 capable of moving the moving member 72 in the axial direction of the support shaft 71 via the support frame 61. And the friction plate 65 and the friction pieces 75 are frictionally engaged, thereby restricting the rotation of the backrest mounting member 30 so that the backrest 40 and the seat plate 20 are desired. It can be held at the inclined position.
[0020]
In addition, the same code | symbol is attached | subjected about the component which is common in a prior art example (FIG. 5), and the description is simplified or abbreviate | omitted.
[0021]
Specifically, the support frame 61 has a U-shaped longitudinal section and is attached to the seat plate receiving member 10. Each friction plate 65 is disposed in the support frame 61 and each rear end portion is rotatably connected to the front portion of the backrest mounting member 30 via the shaft member 35. Here, as the number of friction plates 65 increases, the total friction force generated between the friction pieces 75 increases, but in this embodiment, the number of friction plates 65 is eight.
[0022]
Further, the long hole 66 of each friction plate 65 is formed so as to be inclined with respect to a line connecting the support shaft 71 and the shaft member 35. The friction plate 65 is formed from a metal material (iron or the like) or a synthetic resin. In this embodiment, the friction plate 65 is formed from a synthetic resin containing glass fibers.
[0023]
The support shaft 71 passes through a long hole 66 formed in each friction plate 65 and is supported by the support frame 61 via a moving member 72 that also serves as a bush. The moving member 72 is formed in a cylindrical shape and is movable in the axial direction of the support shaft 71.
More specifically, the right end portion in FIG. 3 of the support shaft 71 is fixed via a lock nut 73. The lock nut 73 prevents the support shaft 71 from coming off and finely adjusts the axial position. The support shaft 71 is formed from a metal material (such as steel) or a synthetic resin. In this embodiment, the support shaft 71 is made of steel.
[0024]
A plurality of friction pieces 75 are held on the support shaft 71 in the support frame 61 so as to come into contact with the friction plates 65. In this embodiment, the number of friction pieces 75 is nine in accordance with the number of friction plates 65. The friction piece 75 is formed from a metal material (iron or the like) or a synthetic resin. In this embodiment, the friction piece 75 is made of stainless steel.
[0025]
The operation portion 81 is pivotally connected to the end portion of the support shaft 71 protruding outward from the support frame 61 in a selected posture, and abuts against the outer surface of the support frame 61 to position and hold the moving member 72 in the locking position. A movable cam member 82 and an operating lever 85 coupled to the cam member 82, and as shown in FIGS. 3 and 4, the moving member 72 is pressed against each friction plate 65 and each friction piece 75. It can be positioned and held at a locking position P1 that frictionally engages with each other, and can be positioned at a locking release position P2 where the frictional engagement between each friction plate 65 and each friction piece 75 is released.
[0026]
In this embodiment, each friction plate 65 and each friction plate 65 and each friction piece 75 can be frictionally engaged with each other in cooperation with the moving member 72 at the support shaft 71 portion in the support frame 61 so as to be more surely engaged. Four disc springs 69 that can press and release the friction piece 75 are held.
[0027]
The cam member 82 is rotatably attached to the support shaft 71 via a pin 83, and has a locking surface 82a and a locking release surface 82b. The distance L1 between the locking surface 82a and the pin 83 is formed to be larger than the distance L2 between the locking release surface 82b and the pin 83.
[0028]
Next, the operation of this embodiment will be described.
[0029]
Let the user of the chair sit deeply on the seat plate 20 and tilt the backrest 40 backward and tilt the rear part of the seatboard 20 downward to hold the backrest 40 and the seat plate 20 in this state. In this case, the cam member 82 is rotated using the operation lever 85, and the moving member 72 is positioned and held at the locking position P1 shown in FIG. Then, each friction plate 65 and each friction piece 75 are pressed by the moving member 72 and frictionally engaged.
[0030]
Thereby, rotation of the backrest attachment member 30 will be controlled, and the seat plate 20 and the backrest 40 can be held at desired positions.
Thus, since the seat plate 20 and the backrest 40 are held at desired positions using the friction plates 65 and the friction pieces 75, the manufacturing cost can be reduced as compared with the conventional example using the gas spring. In addition, since hazardous materials such as high-pressure gas are not used, they can be disposed of as general waste. Therefore, the disposal process is simple and the production cost can be kept low.
[0031]
Further, even if the machining accuracy error of the cam member 82 is somewhat large, each friction plate 65 and each friction piece 75 can be pressed by the elastic restoring force of the disc spring 69, so that the seat plate 20 and the backrest 40 can be more surely desired. Can be held in the position. Further, since the disc spring 69 generates a large elastic restoring force with a small amount of displacement, the installation space of the disc spring 69 can be reduced. Therefore, the size can be easily reduced.
[0032]
Further, when the moving member 72 is positioned and held at the locking position P <b> 1 and the friction plates 65 and the friction pieces 75 are frictionally engaged, the support shaft 71 is strongly against the elongated holes 66 of the friction plates 65. Pressed. Therefore, a large frictional force is generated between the support shaft 71 and each friction plate 65, and the rotation of each friction plate 65 is also prevented by the friction force. As a result, the seat plate 20 and the backrest 40 can be securely held at desired positions.
[0033]
Further, since the constituent elements (65, 71, 72, 75, 81) of the friction engagement means 60 are integrated using the support frame 61, assembly and removal can be performed more easily.
[0034]
In addition, since the friction plate 65 is formed of a synthetic resin containing glass fiber and the friction piece 75 is made of stainless steel, it is excellent in wear resistance and the generation of noise and the like can be minimized. Moreover, generation | occurrence | production of galling etc. can also be prevented.
[0035]
【The invention's effect】
According to the first aspect of the present invention, the plurality of friction plates, the support shaft, the plurality of friction pieces held on the support shaft so as to be frictionally engageable with the friction plates, and the moving member are connected to the axis of the support shaft. And a friction engagement means integrated with a support frame through a support frame. The frictional engagement between each friction plate and each friction piece restricts the rotation of the backrest mounting member. Since the backrest and the seat plate are configured to be able to be held at a desired inclined position, the seat plate and the backrest can be held at a desired position by using a frictional force generated between each friction plate and each friction piece. Therefore, the manufacturing cost can be reduced as compared with the conventional example using the gas spring. In addition, since hazardous materials such as high-pressure gas are not used, they can be disposed of as general waste. Therefore, the disposal process is simple and the production cost can be kept low.
[0036]
According to the invention of claim 2, in addition to the invention of claim 1, it is possible to press and release the friction plates and the friction pieces in cooperation with the moving member held by the support shaft portion in the support frame. Since the disc plate spring is provided, each friction plate and each friction piece can be pressed by the elastic restoring force of the disc spring even if the machining accuracy error of the cam member is somewhat large, so the seat plate and the backrest are more reliably desired. Can be held in the position. Further, since the disc spring generates a large elastic restoring force with a small displacement, the installation space of the disc spring can be reduced. Therefore, the same effect as that of the invention of claim 1 can be obtained, and the size can be further reduced.
[0037]
According to the invention of claim 3, in addition to the invention of claim 1 or 2, the elongated hole of each friction plate is formed so as to be inclined with respect to a line connecting the support shaft and the shaft member. A large frictional force is generated between the support shaft and the long hole of each friction plate, and the rotation of each friction plate is also prevented by the frictional force. Thereby, a seat board and a backrest can be hold | maintained in a desired position more reliably.
[Brief description of the drawings]
FIG. 1 is a diagram for explaining an embodiment of the present invention.
FIG. 2 is a perspective view for explaining friction engagement means.
FIG. 3 is a view in which the moving member is similarly positioned at the unlocking position using the operation lever.
FIG. 4 is a view similarly showing that the moving member is positioned at the locking position by using the operation lever.
FIG. 5 is also a view for explaining a conventional configuration of a chair locking mechanism.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Seat plate receiving member 20 Seat plate 25 Rotating shaft 30 Backrest attachment member 35 Shaft member 40 Backrest 50 Compression spring 60 Friction engagement means 61 Support frame 65 Friction plate 66 Elongation hole 69 Disc spring 71 Support shaft 72 Moving member 75 Friction piece 81 Operation part 82 Cam member 85 Operation lever

Claims (3)

A seat plate receiving member is attached to the upper end portion of the pedestal, and the front portion of the seat plate disposed above the seat plate receiving member is attached to the front portion of the seat plate receiving member so as to be rotatable and movable in the front-rear direction. An intermediate portion of a backrest mounting member that holds the backrest is supported by the seat plate receiving member so as to be rotatable about a rotation axis, and a rear portion of the backrest mounting member is rotatably connected to a rear portion of the seat plate. In the locking mechanism of the chair in which a compression spring is connected to the front portion of the backrest mounting member via a shaft member,
A U-shaped support frame that is an independent member from the seat plate receiving member and is attached to the seat plate receiving member and has an upper end portion opened, and each rear end portion disposed in the support frame a plurality of friction plates which are pivotally connected to the front part of the backrest mounting member via the shaft member, and a support shaft supported by the friction formed plate through the long hole the support frame, the support shaft portion of the support frame as the friction plates and a plurality of friction pieces held in contact, a moving member movably held by the support shaft, and the friction plates the movable member each It presses the friction strip and a frictional engagement positionable locking release position is released operating portion and be mutually positioned and held at the locking position to frictionally engage and the friction plates and the friction piece Each component as a component is supported by the support frame. Frictional engagement means for each of the friction pieces are made of stainless steel with conjugated to and above the friction plate is made of synthetic resin containing glass fiber is provided,
Operation section, the support shaft of which the ends are pivotally connected at a selected position the support frame of the outer surface abuts positionable holding the moving member in the locking position the cam projecting outwardly from the support frame A chair locking mechanism comprising a member and an operation lever coupled to the cam member.  The chair according to claim 1, further comprising a disc spring that is held by the support shaft portion in the support frame and cooperates with the moving member to press and release the friction plates and the friction pieces. Locking mechanism.  The rocking mechanism of the chair according to claim 1 or 2, wherein the long hole of each friction plate is formed so as to be inclined with respect to a line connecting the support shaft and the shaft member.

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