JP4132718B2 - Chair locking device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an adjusting device capable of changing a backward tilt range of a backrest in a rocking chair having a backrest freely tiltable.
[0002]
[Prior art]
The backrest adjusting device in the rocking chair includes a mode in which the backrest is selected to a free state in which the backrest can be freely tilted and a specific locking posture, and a mode in which the back tilt range of the backrest is changed.
[0003]
In the former mode, the locking posture can be locked only in one step of a posture not tilted backward, and can be locked in two steps, a posture not tilted backward and a posture tilted backward (for example, JP 2000-287785), those that can be locked in stages in three or more stages of a non-back tilted posture, a fully tilted posture, and an intermediate posture (for example, see Japanese Patent Laid-Open No. 2000-14485), any posture Can be locked (for example, see Utility Model Registration No. 2545035).
[0004]
On the other hand, as a mode of changing the backward tilt range of the backrest, Japanese Patent Publication No. 64-6733 discloses a stepped stopper hole in a sheet metal member that moves up and down in conjunction with the backrest, and a lever stopper pin. By moving horizontally and moving to any step of the stepped stopper hole, the lock posture does not tilt at all, the free state that can be tilted completely backward, and the middle that can tilt backward to about half of the maximum stroke It is described that it is possible to switch to a state.
[0005]
Japanese Patent No. 2533065 discloses a technique in which a plurality of stacked stopper plates are used as the adjusting means, and the back tilting stroke of the backrest can be adjusted by the thickness of the stopper plate. Yes.
[0006]
[Problems to be solved by the invention]
As shown in Japanese Patent Publication No. 64-6733 and Japanese Patent No. 2533065, if the back tilting stroke can be adjusted, for example, the locking state can be switched between the working state and the resting state, the locking state according to the user's preference can be achieved. There are benefits that can be provided.
[0007]
However, in the adjustment means for horizontally moving the stopper pin with the lever as in Japanese Examined Patent Publication No. 64-6733, the rotation of the lever is converted into the horizontal movement of the stopper pin. If there is, there is a possibility that the stopper pin does not move to an accurate position.
[0008]
In addition, since a certain amount of space is required to allow the stopper to move horizontally and the lever to rotate, there is a problem that it is difficult to harmonize with other members and the versatility is low. In particular, in a synchro-type chair in which the seat is retracted and tilted in conjunction with the back tilt of the backrest, the movement of the seat and the tilting member is complicated, so the adjusting means of Japanese Patent Publication No. 64-6733 is applied. It was awkward.
[0009]
On the other hand, in the configuration of Japanese Patent No. 2533065, it is troublesome to move a large number of stopper plates as a group by different numbers, and there is a problem that the operation structure becomes complicated.
[0010]
The present invention aims to improve such a current situation.
[0011]
[Means for Solving the Problems]
In the invention of claim 1, in a chair comprising a leg, a seat, a backrest that tilts backward against the elastic support means, and a rearward tilt adjustment device for changing a backward tilt range of the backrest, The backward tilt adjusting device includes a rotary wrist that rotates by the operation of a lever, and supports a member that moves in conjunction with the backward tilt of the backrest directly on the outer peripheral surface of the rotary wrist or indirectly through another member. Is set to get.
[0012]
In the invention of claim 2, the chair elastically supports the rear tilting of the tilting member, the seat receiving base provided at the upper end of the pedestal, the seat body, the tilting member to which the backrest is attached and the tilting member is freely tiltable. A spring means and a backward tilt adjusting device for changing the backward tilt range of the tilting member are provided.
[0013]
Furthermore, the seat receiving body is pivotally supported by the seat receiving body by a first shaft, the tilting member is pivotally supported by the seat receiving body by a second shaft, and the seat body and the tilting member are coupled by a third shaft. In addition, by making one of the first shaft and the second shaft a movable shaft that can move back and forth, the seat support body can be moved backward and / or rearward in conjunction with the rearward tilt of the backrest. It has become.
[0014]
The rearward tilt adjusting device includes a rotary wrist attached to the seat receiver so as to rotate around a rotary shaft extending in parallel with the movable shaft, and a lever for rotating the rotary wrist. The movement allowable range of the movable shaft is changed by the rotation of the rotary wrist.
[0015]
According to a third aspect of the present invention, in the second aspect of the present invention, the slide stopper urged to be in a state of being movable toward and away from the movable shaft and in contact with the rotary wrist by a spring is provided between the rotary wrist and the movable shaft. Has been placed.
[0016]
Then, either one or both of the rotary wrist and the slide stopper is provided with pushing means for moving the slide stopper stepwise toward the movable shaft by the rotation of the rotary wrist, and the rotary stopper holding the rotary topper at each stage. The engaging means is disengaged when a certain amount of rotational torque is applied to the rotary topper.
[0017]
[Operation and effect of the invention]
In any claim, it is possible to rotate the rotary wrist by simply connecting a lever to the rotary top and concentrating the lever around its axis. This greatly simplifies the operating mechanism. As a result, it is possible to accurately adjust the back tilting stroke of the backrest by rotating the rotary topper accurately and responsively.
[0018]
Further, since a wide space for allowing the lever and the rotary to rotate is not necessary, it can be easily applied to chairs of various structures as described in claim 2, and is highly versatile. In particular, since the mechanism is simple, the present invention can be easily applied to a synchro-type chair in which the seat body moves backward and backward in conjunction with the backward tilting of the backrest.
[0019]
In the case of claim 2, it is possible to directly support the movable shaft by the rotary wrist by setting the rotary wrist to the cam structure. However, if the rotary shaft is directly supported by the rotary, the rotational range of the rotary top is limited. For this reason, in order to secure the contact area between the rotary wrist and the movable shaft at each adjustment position, there is a possibility that the number of adjustment steps cannot be increased.
[0020]
On the other hand, if the structure of claim 3 is adopted, there is less restriction in forming the pushing means for moving the slide stopper in a stepwise manner toward the movable shaft by the rotation of the rotary topper. The number of steps to advance the slide stopper toward the movable shaft can be increased.
[0021]
Also, at each adjustment stage, the rotary topper and slide stopper are held in engagement by springs, so the adjustment state will not change due to vibrations, etc. Since it can be easily rotated, the ease of operation is not impaired.
[0022]
Rather, the presence of the spring allows the user to check the engagement means with the tick by touching the hand, so that the rotary topper is not stopped in an imperfect position and the operation is reliable. It can be said that it is excellent.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. First, the basic structure of a chair will be described with reference to FIGS.
[0024]
(1) Basic structure FIG. 1 is a front view of a chair, and FIG. 2 is a right side view of the chair. As shown in these drawings, the chair includes a leg 1, a seat 2, a backrest 3, and an armrest device 4. And. The leg 1 includes a leg body 5 having radially extending branches, and a pedestal (gas cylinder) 6 standing at the center of the leg body 5.
[0025]
The pedestal 6 is a leg cover 7, and the mechanism part below the seat body 2 is covered with a support base cover 8. From the support base cover 8, an elevating adjustment lever 9 and a backrest adjusting lever 10 are left and right. It is exposed in the opposite direction. The seat cover 11 is also covered on the lower surface of the side portion of the seat body 2. Further, a waist support portion 12 is integrally attached to the backrest 3, and an armrest device 4 is attached to the waist support portion 12.
[0026]
FIG. 3 is an exploded perspective view of main members for attaching the seat body 2 and the backrest 3, and FIG. 4 is a vertical right side view of the chair with the covers 7 and 8 omitted. As shown in these drawings, a box-shaped seat receiving base 13 that opens upward is fixed to the upper end of the pillar 6. A first bracket 14 for fixing a bush into which the pedestal 6 is fitted is fixed to the rear portion of the seat receiving base 13.
[0027]
An intermediate member 15 is disposed above the seat receiving base 13. The intermediate member 15 includes left and right side plates, and a front portion thereof is attached to the seat receiving base 13 by a first shaft 16. In order to allow rearward tilting and backward movement of the intermediate member 15, a hole in which the first shaft 16 is fitted in the seat receiving base 13 is a longitudinally long slot 17, and a first bushing 18 is inserted into the hole 17. The support shaft 16 is fitted.
[0028]
In addition, lever insertion holes 19 and 20 are provided in the left and right side plates of the seat receiving base 13, respectively.
[0029]
A second U-shaped second bracket 21 is fixed to the lower surface of the seat receiving base 13 at a slightly rearward position, and a tilting member 22 can be tilted rearward by a second shaft 23 to the second bracket 21. It is connected to. The tilting member 22 includes a blade plate 22a that is inclined upward and leftward when viewed from the front, and the waist receiving portion 12 is fixed to the blade plate 22a with a screw.
[0030]
As shown in FIG. 4, the rear portion of the seat base 13 is inclined obliquely upward in a side view, and a screw shaft 24 is inserted into the inclined portion from above. A spring receiving cylinder 25 is fitted to the screw shaft 24 from below, and a compression coil spring 26 as an example of a spring means and an adjustment knob 27 screwed to the screw shaft 24 are fitted to the spring receiving cylinder 25. It is.
[0031]
Therefore, when a person leans against the backrest 3, the backrest 3, the waist receiving portion 12, and the tilting member 22 tilt backward against the elasticity of the coil spring 26.
[0032]
The rear portion of the intermediate member 15 and the front / rear intermediate portion of the tilting member 22 are connected to each other by a third shaft 28 so as to be relatively rotatable.
[0033]
The seat body 2 is composed of inner plates 2a and 2b separated in the front-rear direction and a cushion 2c stretched over the inner plates 2a and 2b. The front and rear inner plates 2a and 2b are connected in a state where they can be bent relatively in a side view. The front inner plate 2 a is attached to the intermediate member 15, and the rear inner plate 2 b is attached to the waist receiving portion 12.
[0034]
When the seated person leans against the backrest 3, the intermediate member 15 and the seat body 2 tilt backward while being retracted in conjunction with the back tilt of the backrest 3 and the waist support portion 12. In this case, the maximum stroke of the backward and backward tilting of the intermediate member 15 is regulated by the first shaft 16 moving through the long hole 17.
[0035]
Although detailed description is omitted, in this embodiment, even if the backward movement of the intermediate member 15 is stopped by the first shaft 16 fully moving through the long hole 17, the seat body 2 is slightly retracted. Can move. Of course, the seat body 2 and the intermediate member 15 may move exactly the same.
[0036]
(2). Backrest adjusting device Next, the adjusting device 32 for regulating the backward tilt range of the backrest 3 will be described with reference to FIG. 5 and subsequent drawings (the adjusting device is not shown in FIGS. 1 to 4). .
[0037]
5 is a plan view of the seat receiving base 13 with the intermediate member 15 omitted, FIG. 6 is an exploded perspective view of the adjusting device 32, and FIGS. 7 and 8 are perspective views of the main members as viewed from the direction of FIG. 9 is a cross-sectional side view, FIG. 10A is a cross-sectional view taken along the line AA in FIG. 5, FIG. 9B is a cross-sectional view taken along the line BB in FIG. 5, and FIGS. It is sectional drawing.
[0038]
The backrest adjustment device 32 is a frame 33 fixed to the seat receiving base 13 by screwing or the like behind the first shaft 16, a slide stopper 34 that is attached to the frame 33 so as to be movable back and forth, and a frame 33 that is rotatably attached to the frame 33. The rotary topper 35 and the lever 10 for rotating the rotary topper 35 are provided.
[0039]
The frame 33 includes left and right side plates 33 a and front and rear standing pieces 36, and a slide stopper 34 and a rotary topper 35 are attached to the frame 33 by a rotating shaft 37 penetrating the left and right side plates 33 a. The lever 10 is fixed to the end of the rotating shaft 37 with a pin 38.
[0040]
The slide stopper 34 is in contact with the side plate 34 in which a longitudinal long hole 39 into which the rotary shaft 37 is fitted is formed, an abutting portion 40 that can abut on the first shaft 16, and a part of the pushing means. The first to fourth step portions 41 to 44 formed so as to be connected to the portion 40 and the flange portion 45 extending in the front-rear direction at the lower portion are provided.
[0041]
The abutting portion 40 extends over the entire length of the slide stopper 34, so that there is an advantage that the first shaft 16 can be supported in a stable state. For example, as can be easily understood from FIG. 8, the first to fourth step portions 41 to 44 have the first step portion 41 located at the center in plan view, and the second step portion 42 to the fourth step portion 44 are left and right. It is arranged in a state of sorting.
[0042]
Further, the first step portion 41 protrudes most rearward in a plan view, and the rearward protruding dimension is set to be smaller toward the fourth step portion 44. In other words, the front-rear thickness of the first step portion 41 is the thickest, and the front-rear thickness decreases toward the fourth step portion 44.
[0043]
Moreover, the upper end of each step part 41-44 is the chamfered inclined surface 46 (refer FIG. 8) by the side view (because it performs the extrusion by the rotary top 35 smoothly). In addition, a rearward projection 47 that is continuous with the inclined surface 46 is formed at the upper end of each of the step portions 41 to 44 as part of the engaging means.
[0044]
For example, as shown in FIG. 10A, a tension spring 48 is fitted to the flange 45 of the slide stopper 34, and the slide stopper 34 is always urged in the backward direction by the spring 48. Further, the slide stopper 34 overlaps the seat base 13 with a large area, and therefore, the posture does not collapse even when a load is applied to the advanced first shaft 16 (the first shaft 16 is supported in a stable state). it can).
[0045]
The rotary upper 35 is fitted between the left and right side plates 34 a of the slide stopper 34, and is attached to the frame 33 so as to be only rotatable by a rotary shaft 37. The rotary topper 35 is fixed to the rotary shaft 37 with a pin 38 (see FIG. 10A).
[0046]
As can be easily understood from FIGS. 6 and 9, the rotary topper 35 has first to first corresponding to the first to fourth step portions 41 to 44 of the slide stopper 34 as a part of the pushing means. The four support portions 49 to 52 are formed in a step shape in plan view.
[0047]
The outer peripheral surface of each of the support holders 49 to 52 is formed in an arc shape with the rotation shaft 37 as the center, and a portion of the first support portion 49 near the outer periphery is an inclined surface 53 (extrusion of the rotary top 35). To make it smoother).
[0048]
Further, forward projections 54 are formed as part of the engaging means at the connecting portions of the support portions 49 to 52 with the outer peripheral surface. The forward projection 54 is engaged with the rearward projection 47 of the slide stopper 34, whereby the attitude of the rotary topper 35 is maintained.
[0049]
As can be understood from FIGS. 9 and 10, a recess 55 into which the rearward projection 47 of the first step portion 41 of the slide stopper 34 fits is formed only in the first support portion 49.
[0050]
In order to set the rotatable range of the rotary upper 35 to about 90 degrees, the rear part is in a lateral direction that hits the upper surface of the frame 33 and / or the slide stopper 34 in a state of being rotated forward and a state of being rotated backward. A protrusion 56 is provided.
[0051]
FIG. 10A shows a free state in which the slide stopper 34 is fully retracted. In this state, the first shaft 16 can freely retract to the full stroke S in the elongated hole 17 in the seat receiving base 13. That is, the backrest 3 tilts backward to the maximum extent. In this state, as shown in FIG. 10B, the inclined surface 46 of the fourth step portion 44 of the slide stopper 34 and the fourth support portion 52 of the rotary wrist 35 are overlapped.
[0052]
When the lever 10 is slightly tilted forward against the elastic force of the tension spring 48 to rotate the rotary wrist 35 a little, the slide stopper 50 is pressed by the fourth support 52 in the rotary wrist 35 as shown in FIG. 34 advances a little. For this reason, the first shaft 16 can only be tilted backward by a dimension slightly shorter than the maximum stroke S. That is, the backward tiltable range of the backrest 3 is slightly reduced.
[0053]
In a state where the fourth support portion 52 and the fourth step portion 44 are in contact with each other, the first to third step portions 41 to 43 of the rotary wrist 35 are located above the slide stopper 34, and the slide stopper 34 Does not interfere. Further, since the rearward projection 47 and the forward projection 54 are engaged, the rotational posture of the rotary wrist 35 and the front and rear positions of the slide stopper 34 are held in a stable state.
[0054]
Although not shown in the drawing, when the rotary topper 35 is further rotated, the third stopper 51 and the third step portion 43 come into contact with each other, so that the slide stopper 34 further advances. Therefore, the back tiltable range of the backrest 3 becomes smaller.
[0055]
When the rotary upper 35 is rotated to the maximum extent, as shown in FIG. 12, the first support portion 49 and the first step portion 41 come into contact with each other, and the slide stopper 34 comes into contact with or closes to the first shaft 16. Go forward. For this reason, the backrest 3 is in a locked state with no or almost no backward tilt.
[0056]
Eventually, in the present embodiment, the backward tiltable range of the backrest 3 can be adjusted in three steps between the free state and the locked state. For this reason, it can respond to a user's request exactly.
[0057]
And since the inclined surface 46 is especially formed in each step part 41-44, rotation operation of the rotary wrist 35 can be performed smoothly. In addition, when the rearward projection 47 and the forward projection 54 are engaged and disengaged, a tick and feel are transmitted to the user's hand, so that the rotary topper 35 can be accurately rotated to a desired posture.
[0058]
Moreover, in this embodiment, since each step part 41-44 and the support parts 49-52 are extended in the longitudinal direction of the rotating shaft 37, the left-right length of the said support parts 49-52 and the step parts 41-44 is provided. Accordingly, the support strength of the first shaft 16 is increased at each stage in which the back tilt of the backrest 3 is adjusted, and as a result, high durability can be ensured.
[0059]
In the present invention, the rotor topper 35 and the slide stopper 34 are made of synthetic resin, so that no metal rubbing noise is generated during operation, and the rotor topper 35 can be smoothly rotated with moderate friction. There is an advantage (the same advantage can be obtained even if only one of them is made of synthetic resin).
[0060]
In the present embodiment, the rotary topper 35 and the slide stopper 34 are integrated into the frame 33 so as to form a single unit, so that there is an advantage that storage and assembly are easy.
[0061]
(3) Others In addition to the above embodiments, the present invention can be embodied in various ways. For example, there is a synchro-type chair that is configured such that the second shaft moves forward and the seat is only tilted backwards in conjunction with the backrest. In this case, the adjustment device of the above embodiment is It is sufficient to support two axes.
[0062]
Further, in claim 1, it is not always necessary to support the movable shaft. For example, the backward tilt range of the backrest can be regulated by directly supporting the tilting member's rearward tilt, the seat body's rearward tilt, and the like. . In short, the shape of each member may be changed according to the structure of the chair.
[0063]
The pushing means and the engaging means can also be changed according to the structure of the chair.
[Brief description of the drawings]
FIG. 1 is a front view of a chair.
FIG. 2 is a right side view of the chair.
FIG. 3 is an exploded perspective view showing a mechanism portion of the chair.
FIG. 4 is a longitudinal side view of the adjusting device in a state where it is discarded.
FIG. 5 is a plan view of the seat receiving body with the intermediate member omitted.
FIG. 6 is an exploded perspective view of the adjusting device.
FIG. 7 is a perspective view of a rotary topper as seen from the rear.
FIG. 8 is a perspective view of the slide stopper as viewed from the rear.
FIG. 9 is a separated side sectional view.
10 is a cross-sectional view taken along line AA in FIG. 5 and a cross-sectional view taken along line BB.
FIG. 11 is a cross-sectional view showing movement.
FIG. 12 is a cross-sectional view in a locked state.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Leg body 2 Seat body 3 Backrest 10 Backrest adjustment lever 12 Waist receiving part 13 Seat receiving base 16 1st axis | shaft 17 Long hole 22 Tilt member 23 2nd axis | shaft 28 3rd axis | shaft 32 Backrest adjustment apparatus 33 Frame 34 Slide stopper 35 Rotary topper 37 Rotating shaft 41 to 44 Step portion (pushing means)
46 Sloping surface of slide stopper 47 Backward projection (engaging means)
48 Spring 49-52 Supporting part (pushing means)
54 Forward projection (engagement means)

Claims (3)

In a chair comprising a leg, a seat, a backrest that tilts backward against the elastic support means, and a rearward tilt adjustment device for changing a rearward tilt range of the backrest,
The backward tilt adjusting device includes a rotary topper that rotates by operating a lever, and supports a member that moves in conjunction with the backward tilting of the backrest directly on the outer peripheral surface of the rotary topper or indirectly through another member. Is set to be able to
Chair locking device. A seat receiving base provided at the upper end of the pedestal, a seat, a tilting member to which the backrest can be attached and freely tilted backward, a spring means that elastically supports the tilting of the tilting member, and a tilting range of the tilting member And a rear tilt adjustment device for changing the
The seat receiving body is pivotally supported by the seat receiving body by a first shaft, the tilting member is pivotally supported by the seat receiving body by a second shaft, and the seat body and the tilting member are coupled by a third shaft. By making either one of the first shaft and the second shaft a movable shaft that can move back and forth, the seat support body moves backward and / or rearward in conjunction with the rearward tilt of the backrest. In the chair
The backward tilt adjusting device includes a rotary wrist that is attached to a seat receiving body so as to rotate around a rotary shaft that extends in parallel with the movable shaft, and a lever that rotates the rotary wrist, The movement allowable range of the movable shaft is changed by the rotation of
Chair locking device. Between the rotary wrist and the movable shaft, a slide stopper that is movable toward and away from the movable shaft and is urged to contact the rotary wrist by a spring is disposed.
Either one or both of the rotary stopper and the slide stopper, push means for moving the slide stopper stepwise toward the movable shaft by the rotation of the rotary wrist, and engagement means for holding the rotary stopper at each stage The engagement means is disengaged when a certain amount of rotational torque is applied to the rotary topper.
The chair locking device according to claim 2.

Images