JPH0446601Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a seat tilting stopper for a chair.

(Prior Art) Conventionally, there is a chair in which the seat is configured to be tiltable with respect to a frame fixed to a supporting part such as a leg.
In these chairs, a stopper is provided to stop the seat from tilting. A typical stopper is a type called a pin type. This pin-type stopper has a pin hole drilled in a frame fixed to a supporting member such as a leg, and a pin provided in a swinging member that can swing integrally with the seat relative to the frame. When the stopper is activated, it enters the pin hole on the fixed side and prevents the swinging portion from swinging.

(Problems to be solved by the invention) However, the above conventional stopper has the following problems.

For machining accuracy and operability, play is required between the pin and the pin hole, which causes rattling and makes it impossible to reliably stop the seat from tilting.

Further, since the position where the pin fits into the pin hole cannot be seen by the user while sitting, the operation is inconvenient.

When using with the stopper activated,
There is a problem that the pins are easily broken because a large shearing force is applied to the pins.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a seat tilting stopper for a chair that does not shake when the stopper is operated, has good operability, and is highly durable.

(Means for Solving the Problems) In order to solve the above problems, the present invention has the following configuration.

That is, a frame, a rotation shaft that is rotatably provided with respect to the frame and that substantially fixes the seat, and is in a fixed relationship with the seat;
a regulating member that comes into contact with the upper surface and/or lower surface of the frame to regulate the swinging range of the seat when the seat pivots about the rotation axis; and a surface of the frame that corresponds to the regulating member. a wedge stopper that is wedged between the member and the surface of the frame to prevent the seat from swinging; It is characterized by comprising a driving means for releasing the wedge engagement.

(effect) Let's talk about the action.

The wedge stopper is driven by the driving means, and the wedge stopper is wedged between the regulating member and the surface of the frame.
This wedge engagement eliminates play between the regulating member and the frame, stopping the regulating member from swinging with respect to the frame, thereby preventing the seat fixed to the regulating member from tilting.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, the configuration will be explained with reference to FIGS. 1 to 3.

10 is a frame, and a column 12 is a support part.
Fixed to . A height-adjusting arm 16 is disposed inside the frame 10, which has a substantially U-shape in plan and whose central portion is pivotally attached to a side wall surface via a shaft 14. The tip of this arm 16 on the column 12 side can come into contact with a push pin 18 of a gas spring provided at the top of the column 12.

20 is a swing joint which is a regulating member;
The frame 10 has a substantially U-shaped cross section, and the end of the frame 10 on the side opposite to the support column 12 is accommodated within the U-shaped opening. An appropriate gap is formed between the inner surface of the swing joint 20 and the outer surface of the portion of the frame 10 accommodated therein. Pipes 22a and 22b, which are rotation shafts, are fixed to both ends of the swing joint 20, and the pipes 22a and 22b and the swing joint 20 are fitted onto a pipe 24 that is inserted through and fixed to the frame 10. . Swing joint 20
The range of swing is restricted by the gap with respect to the frame 10. In addition, pipes 22a, 22b
Side frames 26a and 26b are fixed to the
A seat (not shown) is attached to the upper surface. The seat is therefore substantially fixed to the pipes 22a, 22b and also in fixed relation to the pivot joint 20.

28 is a slide block which is a wedge stopper;
The swing joint 2 is arranged on the upper surface of the frame 10.
0 by sliding on the upper surface of the frame 10 and can move toward and away from the frame 10 (in the directions of arrows B and C). A tapered portion 30 whose thickness gradually decreases toward the tip is provided at the end of the slide block 28 on the swing joint 10 side. A space 32 is formed inside the slide block 28, and a tapered surface 34 is provided on the inner wall of the space 32. Further, the sliding movement of the slide block 28 is guided by a cover 36 that covers the slide block 28 and is fixed to the upper surface of the frame 10. A spring 38 is disposed inside the cover 36 and always urges the slide block 28 toward the swing joint 20.

Reference numeral 40 denotes a control unit, which has a substantially T-shaped cross-section, and the vertical portion of the T-shape is inserted into a slot 42 formed in the frame 10, and the control unit 40 moves in the directions of arrows D and E. It's becoming possible. Further, the upper part (horizontal part of the T-shape) of the control section 40 is accommodated in the space 32 of the slide block 28, and a tapered part 44 corresponding to the tapered part 34 on the inner wall surface of the space 32 is formed.

46 is a slide pipe, and the pipe 22
a, and levers 48a and 48b are fixed to the ends thereof. Furthermore, a connecting arm 50 bent into an appropriate shape is fixed to the lower part of the slide pipe 46, and the connecting arm 50 projects into the frame 10 via a long hole 52 formed on the side surface of the frame 10. death,
The tip end is connected to the vertical lower end of the T-shape of the control section 40 via a connecting fitting 54 . This connecting metal fitting 54
By using the connecting arm 50, the distal end of the connecting arm 50 can linearly move the control unit 40 in the directions of arrows D and E, and the end of the arm 16 on the swing joint 20 side can be rotated in the vertical direction. It's summery.

The control section 40, slide pipe 46, lever 48a, and connection arm 50 constitute a driving means for driving the slide block 28, which is a wedge stopper.

Next, the operation will be explained.

What is shown in the drawing is that the stopper mechanism is activated and the slide block 28 moves in the direction of arrow C, so that the tapered portion 30 is connected to the inner surface of the swing joint 20 and the frame 10.
The swing joint 20 is wedged into the gap 56 with the top surface.
This is a state in which the swinging of the chair relative to the frame 10 is prevented, and the tilting of the seat (not shown) of the chair is prevented. At this time, the slide pipe 46 is moved in the direction of arrow E.
It is in a state where it is pushed in the direction of.

To release the stopper mechanism and enable the seat to tilt, hold the lever 48a and move the slide pipe 4.
6 in the direction of arrow D. Then the connection arm 50
The control unit 40 is pulled in the direction of arrow D via the arrow D.
At this time, since the tapered part 34 of the slide block 28 and the tapered part 44 of the control part 40 are in contact with each other at the angle shown in the figure, the slide block 28 is guided by the cover 36 in the direction of arrow B against the biasing force of the spring 38. Move and swing joint 20 and frame 1
Release the wedge between 0. Then, the swing joint 20 can swing with respect to the frame 10 by the distance of the gap 56, and the seat of the chair can be tilted.

To operate the stopper mechanism again, hold the lever 48a and push the slide pipe 46 in the direction of arrow E. Since the control section 40 also moves in the direction of arrow E, the slide block 28 is moved by the biasing force of the spring 38. As the slide block 28 moves in the direction of arrow C, the tapered end portion 30 of the slide block 28 closes the gap 56 between the swing joint 20 and the frame 10.
The pivot joint 20 is wedged with the frame 10, and the pivot joint 20 is again prevented from pivoting relative to the frame 10.

The height of the chair seat can be adjusted by rotating the lever 48b to rotate the slide pipe 46, and at the tip of the connecting arm 50, rotate one end of the arm 16 on the swing joint 20 side upward. When the arm 16 is turned, the other end of the arm 16 is connected to the push pin 1 of the gas spring.
Press 8 to activate. This allows you to adjust the height of the seat.

Next, other embodiments of the wedge stopper driving means, such as a slide block, will be described.

FIG. 4 shows an example in which the principle of operation of the slide block 100 and the control section 102 is the same as in the previous embodiment, but a wire 104 is used as a means for moving the control section 102.

FIG. 5 shows an example in which the slide block 110 is directly driven by a wire 112.

FIG. 6 shows an example in which a cam 124 rotatable about a shaft 122 is rotated by a rod 126 or a wire as a means for driving the slide block 120.

Next, another example of the wedge stopper is shown in FIG.

This is an example in which a cam-shaped wedge stopper 138 rotatable about a shaft 136 can be wedged into a gap 134 between a swing joint 130 and a frame 132. This wedge stopper 138 is driven using a rod 140, a wire, or the like.

Although various preferred embodiments of the present invention have been described above, the present invention is not limited to the above-mentioned embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. be.

(Effect of the invention) When the seat tilting stopper of the present invention is used, as a means for stopping the swinging of the regulating member and the frame, a method is adopted in which the regulating member and the frame are wedged together, so there is a gap between the regulating member and the frame. This eliminates play and prevents rattling. Also,
Since the stopper is a wedge-locking system, the stopper does not operate at a specific position, so the user can operate it reliably even while seated. In addition, unlike pins, the weight of the user does not act intensively, so it has great effects such as good durability.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway plan view showing an embodiment of the seat tilting stopper for a chair according to the present invention, Fig. 2 is a rear sectional view thereof, and Fig. 3 is a side view showing the A-A section of Fig. 2. 4 to 6 are plan views showing other embodiments of the wedge stopper driving means, and FIG. 7 is a side sectional view showing another embodiment of the wedge stopper. 10... Frame, 12... Support, 20... Swing joint, 22a, 22b... Pipe, 28
... Slide block, 40 ... Control section, 48
a, 48b... lever, 50... connection arm.

Claims (1)

[Claims for Utility Model Registration] A frame, a rotation shaft that is rotatably provided with respect to the frame and that substantially fixes the seat, and a rotation shaft that is in a fixed relationship with the seat and that rotates the rotation axis. between a regulating member that limits the swinging range of the seat by coming into contact with the upper and/or lower surfaces of the frame as the seat swings about an axis; and a surface of the frame that corresponds to the regulating member; a wedge stopper that is wedged together to prevent the rocking of the seat; and a wedge stopper that moves between the regulating member and the surface of the frame to wedge the wedgestop members together or to prevent the wedgework. 1. A seat tilting stopper for a chair, characterized in that it comprises a driving means for releasing the seat.