JPS6342845Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gradual reclining device for the backrest of a relatively heavy chair, such as a chair equipped with an electric pine surge device.

Many reclining devices are already known for making the backrest of a chair tiltable, but they are difficult to apply to heavy chairs, such as the chair known as the electric pine surge machine. The reality is that a structure that uses a fluid cylinder is usually adopted. However, the fluid cylinder type reclining device requires a large amount of installation space, requires high precision, is complicated to operate, and is expensive.

The present invention not only has a simple structure, but also provides an inexpensive reclining device that can withstand high loads and can be installed in a narrow space.

The drawings showing embodiments of the present invention will be described below. FIG. 1 shows the bending member 1 that constitutes the main part of the device of the present invention, and FIG. 4 shows the components in an exploded manner. a first arm 5 having a U-shaped cross section and having at least three hook-shaped teeth 2 and a fan-shaped portion 4 having an arcuate long hole 3 extending parallel to the teeth 2; a second arm having a plate portion 8 having a vertically elongated hole 6 bored at a position extending across the hook-shaped toothed portion 2 and a horizontally elongated hole 7 bored at a position communicating with the arc-shaped elongated hole 3; The fan-shaped portion 4 and the plate portion 8 are overlapped with each other, and are connected in a bendable and extensible manner by a pivot pin shaft 10 at the center of the arc radius of the fan-shaped portion 4. Pins 11 and 12 are inserted into the arcuate long hole 3, the horizontally long hole 7, and the vertically long hole 6, respectively.
are connected by links 13, 13, and the horizontally elongated hole 7
The outer pin 11 inserted into the pivot pin shaft 1
A tension spring 14 is interposed between the
Due to the tensile elasticity of the spring 14, the outer pin 11 is pushed into the hook-shaped notch 2A of the toothed portion 2.
It is designed to be oppressed within ~2C. In addition, when the outer pin 11 is engaged with the hook-shaped tooth portion 2, the outer pin 11 is inserted through the pivot pin shaft 10, the arcuate long hole 3, and the horizontally long hole 7. The link 1 is located closer to the first arm 5 than the straight line 15 connecting the inner pin 12.
3 maintains a state of being tilted toward the first arm 5 side.
Then, the first and second arms 5 and 9 are bent, and the inner pin 12 is moved along the circular arc-shaped elongated hole 3, and the outer pin 11 is moved to the next notch of the ratchet-shaped tooth portion 2. 2B and 2C and are moved while being sequentially inserted into the pins 2B and 2C, and the outer pins 11
When both arms 5 and 9 are expanded to a position where the arm passes through the final notch 2C, the inner pin 12 comes into contact with the terminal end 3A of the arc-shaped elongated hole 3, preventing movement, as shown in FIG. Then, only the outer pin 11 is moved to bring the link 13 into an upright state, and the outer pin 11 is also displaced toward the upper end 6A of the vertical hole 6 against the elasticity of the tension spring 14. With the tensile elasticity being restrained, the arms 5 and 9 can be moved away from the edge of the fan-shaped portion 4 and returned to their original expanded positions. Subsequently, when both the first and second arms 5 and 9 are bent, the link 13 connects to the pin 11 in the vertical hole 6.
Since the pin 12 in the horizontally elongated hole 7 is positioned in a straight line with the pin 10, the tilting force of the link 13 becomes a dead center and is canceled out, so it is moved in an upright state, and the inner pin 11 is moved in an arc shape. Starting end 3 of long hole 3
B, the inner pin 12 is prevented from moving, and the outer pin 11 is further moved, so that the link 13 is tilted, and the outer pin 1
1 is configured to be fitted into the first notch 2A.

The present invention utilizes the bending member 1 having the above-mentioned structure as shown in FIG.
For example, the end 9A of one arm 9 is attached to the front frame member 18 of the seat part 17 via a universal joint 19, and the end 5A of the other arm 5 is attached to the front frame 18 of the seat part 17 in a substantially horizontal state on the lower surface. It is attached to the lower end part 21A of the backrest part 21 via 20,
The backrest portion 21 is designed to be able to maintain at least three angular inclination positions.

Next, the operation procedure will be described with reference to FIGS. 6 to 9, which schematically show the stepwise reclining action of the backrest portion 21. First, when both the first and second arms 5, 9 are fully bent, the sixth As shown in the figure, the above-mentioned outer pin 11 is connected to the first arm 5.
The backrest part 21 is fitted into the first notch 2A on the side, and the end distance H of both arms 5 and 9 is minimized.
hold in the most inclined position. Next, when the backrest portion 21 is pushed and displaced in the upright direction, the lower end portion 21A of the backrest portion 21 is moved rearward, thereby expanding the bending member 1, and as described above, the outer pin 11 is moved to the inclined portion of the tooth portion 2. After being moved along the notch 2B, the backrest portion 21 is inserted into the next notch 2B.
The vehicle is set so that it cannot be reversed in a slightly erect position. (Fig. 7) When the backrest part 21 is further displaced in the upright direction, the outer pin 11 is fitted into the third notch 2C in the same manner as described above, and the backrest part 21 is moved back in the upright state. to hold incapably. (FIG. 8) When the backrest portion 21 is to be tilted again to the highest inclination position or the next inclination position, once the backrest portion 21 is once displaced toward the seat portion 17 side as shown in FIG. As described above, when the link 13 is in the upright state, the outer pin 11 is disengaged from the toothed part 2 and moves away from the toothed part 2, and the upright state of the link 13 is maintained and the backrest part 21 is prevented from moving backward. Become free. Next, in this state, when the backrest portion 21 is tilted toward the most inclined position, the inner pin 12 touches the starting end 3B of the arcuate long hole 3, as described above.
The movement of the outer pin 11 is stopped when it comes into contact with the outer pin 11.
By moving the chisel slightly further, link 13
is tilted, and the outer pin 11 is lowered toward the toothed portion 2 by the elasticity of the tension spring 14, and the outer pin 11 is fitted into the first notch 2A, setting it in the state shown in FIG. If the backrest portion 21 is moved slightly in the upright direction from this state, the state shown in FIG. 7 can be set.

In the embodiment, three notches 2A, 2B, and 2C are provided in the fan-shaped portion of the first arm 5 to adjust the inclination of the backrest portion 21 in three stages. Depending on the number of notches in the portion 4, it is possible to have four or five stages, and the inclination angle of each stage can be determined by changing the pitch of each notch.

As detailed above, the reclining device according to the present invention has at least three hook-shaped teeth 2 on the edge thereof, and further includes an arcuate long hole 3 bored approximately parallel to the teeth 2. A first arm 5 having a sector-shaped portion 4; a vertically elongated hole 6 bored at a position extending across the toothed portion 2; and a horizontally elongated hole 7 bored at a position communicating with the arc-shaped elongated hole 3. A second arm 9 having a plate portion 8 with a plate portion 8 is superimposed on the fan-shaped portion 4 and the plate portion 8, and is connected to both arms by a pivot pin shaft 10 approximately at the center of the base of the fan-shaped portion 4. 5 and 9 are connected so as to be relatively bendable and extensible, and pins 11 and 12 are inserted into the arcuate long hole 3, the horizontally long hole 7, and the vertically long hole 6, respectively, and both pins 11 and 12 are connected to the link 13. A tension spring 14 is interposed between the outer pin 11 and the pivot pin shaft 10, which are coupled together and inserted into the longitudinal hole 6.
1 is pressed against the tooth portion 2 side, and the outer pin 11
When engaged with the toothed portion 2, the outer pin 11 forms a straight line 15 connecting the pivot pin shaft 10 and the inner pin 12 inserted through the arc-shaped elongated hole 3.
When both arms 5 and 9 are expanded, the inner pin 12 is moved along the arcuate elongated hole 3, and the outer pin 11 is moved along the arcuate long hole 3. Notches 2A, 2 of tooth portion 2
The inner pin 12 is moved by the terminal end 3A of the arcuate long hole 3 when the outer pin 11 passes through the final notch 2C. Only the outer pin 11 is blocked and the link 13 is erected, and the outer pin 11 is also displaced outward so that both arms 5 and 9 can be bent.
9 is bent and the outer pin 11 is the first notch 2
When the A upper position is reached, the inner pin 1
2 comes into contact with the starting end 3B of the arcuate elongated hole 3, the link 13 is tilted toward the first arm 5, and the outer pin 11 is inserted into the first notch 2A. The member 1 is arranged on the lower surface of the seat part 17 of the chair main body 16, and the outer end 9 of the second arm 9
A is attached to the front frame 18 of the seat section 17, and the outer end 5A of the first arm 5 is attached to the lower end of the backrest section 21 via universal joints 19 and 20, respectively, so that the main body of the chair is 16 backrest part 2
1 from its most inclined state in the upright direction, it can be sequentially set in a desired inclined position in a non-returnable manner. Even if a large load is applied to the backrest part 21, the outer pin 11 that fits into the tooth part 2 is located in the vertically long hole 6 of the second arm 9, so the entire load is transferred to the outer pin 11. Tooth part 2
Since the outer pin 11 is pressed toward the pivot pin shaft 10 side by the tension spring 14, it will come off from the notch due to the influence of vibration etc. This allows the backrest portion 21 to be held in a non-retractable state. Furthermore, since the bending/stretching member 1 can perform the above-mentioned reclining action even when placed in a horizontal state, the bending/stretching member 1 can be installed using the flat narrow space on the lower surface of the seat portion 17; Since the bending member 1 is attached to the chair main body 16 via universal joints 19 and 20, the backrest portion 2
It has the advantage that the vertical displacement of the bending/stretching member 1 based on the tilting/standing up of the chair 1 is performed smoothly, and is particularly suitable as a reclining device for a heavy chair such as an electric pine surge machine.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and
Figures 1 and 2 are front and side views of the bending member, Figure 3 is an enlarged sectional view of the bending member in an expanded state, with parts omitted, Figure 4 is an exploded view of the bending member, and Figure 5 1 is a partially omitted perspective view showing the state in which the bending/extending member is attached, and in FIGS. Each is a simplified explanatory diagram. DESCRIPTION OF SYMBOLS 1... Bending member, 2... Teeth, 3... Circular long hole, 4... Fan-shaped part, 5... First arm, 6
... Vertical long hole, 7 ... Horizontal long hole, 8 ... Plate part, 9 ... Second arm, 10 ... Pivot pin shaft,
11...Outer pin, 12...Inner pin, 13
...Link, 14...Tension spring, 15...
...Straight line, 16...Chair main body, 17...Seat part, 1
8...Front frame material, 19, 20...Universal joint,
21...Backrest part.

Claims (1)

[Scope of utility model registration request] a first arm 5 having a sector-shaped portion 4 having at least three hook-shaped teeth 2 on its end edge and an arcuate long hole 3 bored substantially parallel to the teeth 2; , a second arm having a plate portion 8 having a vertically long hole 6 bored at a position extending across the toothed portion 2 and a horizontally long hole 7 bored at a position communicating with the arcuate long hole 3; 9 are superposed in the fan-shaped portion 4 and the plate portion 8,
Both arms 5 and 9 are relatively bendably and extensibly connected by a pivot pin shaft 10 at approximately the center of the base of the fan-shaped portion 4, and the arc-shaped long hole 3, the horizontally long hole 7, and the vertically long hole 6 are connected to each other by a pivot pin shaft 10. pins 11 and 1 respectively
2 is inserted, and both pins 11 and 12 are connected by a link 13, and a tension spring 14 is interposed between the outer pin 11 inserted through the vertical hole 6 and the pivot pin shaft 10. A bending member 1 in which the outer pin 11 is pressed toward the toothed portion 2 side is disposed on the lower surface of the seat portion 17 of the chair main body 16, and the second arm 9
The outer end 9A of the front frame member 18 of the seat portion 17
, the outer end 5A of the first arm 5 is attached to the backrest 2.
1. A reclining device for a chair backrest, characterized in that the reclining device is attached to the lower end of a chair backrest via universal joints 19 and 20, respectively.