JPH0224527B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a so-called reclining chair in which the inclination angle of the backrest can be freely adjusted and fixed, and in particular, a chair in which the rear part of the seat plate moves downward in conjunction with the inclination of the backrest. It is.

Conventionally, in chairs with a structure in which the seat plate is fixed horizontally and only the backrest can be tilted, when the backrest is tilted, the gap between the rear edge of the seatboard and the bottom edge of the backrest changes. There was a drawback that if you pushed the backrest backwards, you would experience the unsightly feeling of having your shirt or jacket in contact with the backrest being turned up. Furthermore, since the seat is horizontal despite the tilting of the backrest, the entire body tends to slide forward, making the posture unstable and making it difficult to sit.

On the other hand, chairs with a structure in which the seat and backrest are integrated and tilt backwards have also been devised, but all of these tilt using the support that supports the center of the seat as a fulcrum, so as the seat is tilted, As a result, the front edge of the seat would rise, causing the feet to float up, making the seat uncomfortable to sit on.

The present invention eliminates all of the above drawbacks and provides a chair that is functional and comfortable to sit on.

An embodiment of the present invention will be described below based on the drawings.
In the figure, reference numeral 1 denotes a column erected on a leg 2, and a box-shaped fixing frame 3 is fixed to the upper end of the column. 5
is drilled. Reference numeral 6 designates a backrest frame having an L-shaped side surface and mounting the backrest 7 on the front of the vertical part, and has shaft holes 8, 8, 9, and 9 near the front end 6a and bent part 6b, respectively.
is bored, and the backrest frame 6 is pivoted to the fixed frame 3 by inserting the shaft 10 through the shaft holes 8, 8 of the front end part 6a and the shaft holes 5, 5 of the fixed frame 3. ing.
Further, in the shaft holes 9, 9 near the bent portion 6b, bearings 13, which are bored at the rear end of the underframe 12 on which the seat plate 11 is placed,
Pins 14, 14 are inserted through 13 to pivotally connect the backrest frame 6 and the underframe 12. The underframe 12 is framed in a rectangular plane as a whole by molded channel members on both sides and the rear, and a receiving part 18 consisting of side walls 15, 15, a bottom wall 16, and a front wall 17 at the front edge. Bearing pieces 19, 19, 19', 19' are provided upright on the bottom wall 16 of the receiving portion 18 at predetermined intervals. And these bearing pieces 19, 19, 19',
A horizontal shaft 20 is pivotally supported at 19'.

On the other hand, arm pieces 21, 21 are protruded from the front of the fixed frame 3, and substantially horizontal elongated holes 22, 22 bored in the arm pieces 21, 21 are formed in the side walls 15, 22 of the receiving part 18,
15 and the bearing pieces 19', 19', and the horizontal shaft 20 is inserted into the elongated holes 22, 22.

23 is a gas spring that connects the fixed frame 3 and the horizontal shaft 20. The gas spring 23 is a well-known type commercially available in Japan, for example, from Tokico Co., Ltd., and when the chair 26 of the push pulp 25 protruding toward one side of the cylinder 24 is pressed, the gas spring 23 is partitioned by a piston (not shown). High pressure gas can move inside the cylinder 24 and the lock is released.
At this time, if the external force applied to the piston rod 27 is greater than the gas pressure, the piston rod 27 is pushed into the cylinder 24, and conversely, if the external force is small, the piston rod 27 is pushed out of the cylinder 24 by the gas pressure. .

In this embodiment, the tip of the piston rod 27 of the gas spring 23 is pivotally attached 28 to the inner wall of the fixed frame 3, and the bifurcated piece 29 fixed to the tip of the push valve 25 is pivoted to the horizontal shaft 20. A knob 26 is made to protrude from the center of the piece 29. And the bearing piece 1 corresponding to the bifurcated piece 29
The upper end of a pressing member 30 having an L-shaped side surface is pivotally attached 31 between 9 and 19', and the front surface of the pressing member 30 and the knob 2
6 is always in contact. Reference numeral 32 designates an operation lever that is bent into a planar shape, and a pivoting portion 33 is pivotally supported on the receiving portion 18 so as to operate in a seesaw manner, one end of which faces the upper surface of the rear end of the pressing member 30, and the other The end is a notch 34 provided in the side wall 15 of the receiving portion 18.
It protrudes from the underframe 12 to the outside.

Note that a lever 35 protruding on the opposite side of the operating lever 32 is for moving the seat plate 11 up and down.
Since it is not directly related to the present invention, its operation will be briefly explained. When the outer end of the lever 35 is moved upward, the lever 36 pivotally connected to the horizontal shaft 20 rotates counterclockwise in FIG. By this, the fixed frame 3
The pressing rod 38 pivotally attached to the column 37 rotates clockwise in the figure, and the knob 26' of the gas spring 23' housed in the column 1 is pressed, and the lock of the gas spring 23' is released as described above. The seat plate 11 can be moved up and down.

In the chair A of the present invention configured in this way, even if a force is applied to the back frame 6, the gas spring 23 is in a locked state, so the movement of the under frame 12 is prevented, and therefore the back frame 6 is prevented from moving. It does not rotate either. On the other hand, when rotating the backrest frame 6, lift the outer end of the operating lever 32 upward and move the rear end of the pressing member 30 downward as shown by the chain line in FIG. The gas spring 23 is rotated forward using the fulcrum as a fulcrum, and the knob 26 is pressed to release the lock of the gas spring 23. Therefore, if a backward force is applied to the backrest frame 6 in this state, the backrest frame 6 will tilt backward using the shaft 10 as a fulcrum while pulling down the pin 14, and the underframe 12 will be pulled rearward accordingly. , horizontal axis 2
0 moves along the elongated hole 22 of the fixed frame 3 while compressing the piston rod 27 of the gas spring 23. At this time, the rear part of the underframe 12 is inclined downward about the horizontal axis 20, so that the front end of the seat plate 11 hardly rises.

When you release your hand from the operating lever 32 at an arbitrary position, the pressing member 30 is pushed back by the restoring force of the knob 26, and the gas spring 23 is locked again, thereby locking the underframe 1.
2 and the backrest frame 6 are both fixed in an inclined state.

Since gas pressure is stored in the gas spring 23 in a compressed state, the lock of the gas spring 23 is released as described above.
If no force is applied to the backrest frame 6, the piston rod 27 will expand due to the gas pressure of the gas spring 23, and the horizontal shaft 20 will be pushed back, allowing the backrest frame 6 to stand up.

Although the operating lever 32 is shown attached to the underframe 12 in this embodiment, the present invention is not limited to this. For example, when the operating lever 32 is attached to the fixed frame 3, it may be necessary to attach the operating lever 32 to the fixed frame 3. The push valve 25 may be pivotally mounted to the inner wall of the fixed frame 3, and the piston rod 27 may be pivotally mounted to the horizontal shaft 20.

As described above, according to the present invention, the fixed frame, the backrest frame, and the underframe are pivoted and interlocked with each other, and this movement is controlled by the gas spring, so that the backrest frame (backrest) The underframe (seat plate) can be tilted and fixed simultaneously and steplessly, and since the underframe tilts around the horizontal axis, there is little vertical movement of the front edge of the seat plate. No matter how you change the posture, you can always sit in a stable and comfortable posture, and the conventional drawbacks such as feet lifting when the backrest is tilted backwards are eliminated.

In addition, when the backrest frame is tilted backward, the underframe slides accordingly, so the gap between the backrest and the seat plate hardly changes, and therefore, the process of tilting the backrest backwards is much easier than in the conventional method. This eliminates the inconvenience caused by folding up the dress shirt, etc., and provides a comfortable chair.

[Brief explanation of drawings]

The figures relate to one embodiment of the present invention, and Fig. 1 is an external perspective view, Fig. 2 is an exploded perspective view showing the backrest frame and underframe disassembled, Fig. 3 is a plan view, and Fig. 4 is an exploded perspective view. The figure is a cross-sectional view taken along the line X-X in Figure 3, and Figure 5 is a cross-sectional view taken along the Y-X line in Figure 3.
It is a sectional view taken along the Y line. 1... Support, 2... Leg, 3... Fixed frame, 4... Side,
6... Backrest frame, 6a... Front end portion, 6b... Bent portion, 11
...Seat plate, 12...Underframe, 20...Horizontal axis, 22, 22
...Long hole, 23...Gas spring, 25...Push valve, 32...Operation lever.

Claims (1)

[Claims] 1. A box-shaped fixing frame is fixed to the upper end of the pillar erected on the legs, and the front end of the backrest frame with an L-shaped side surface is pivoted to the rear of the fixing frame, while the bent part of the backrest frame is attached to the rear part of the fixing frame. On the other side, the rear end of the underframe on which the seat plate is placed is pivoted, and a horizontal shaft pivoted on the front of the underframe is inserted into a substantially horizontal elongated hole drilled in the front of the fixed frame. one end of the gas spring is pivoted to the inner wall of the fixed frame, the other end is pivoted to the horizontal shaft, and an operating lever for opening and closing the push valve of the gas spring is provided extending below the seat plate. A distinctive chair.