JPH0312286Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a ratchet tool used mainly for the backrest of a chair whose inclination angle can be adjusted.

A. Prior Art Chairs with adjustable tilt angles have already been developed. Although this chair is rotatable, the backrest is attached to the base of the chair via a ratchet that can be stopped at a desired rotational position. The tilt angle of this backrest can be adjusted to several levels. To adjust the tilt angle, when the backrest is fully raised, the hooked state of the claw is released, and in this state, the backrest is completely reclined, and then each time the backrest is raised one step at a time, the claw engages with the ratchet wheel fixed to the backrest. and stop at each stage of inclination angle.

The ratchet tool currently most commonly used for this purpose includes a ratchet wheel fixed to the base of the lower end of the backrest, a pawl that controls the rotation and stopping of the ratchet wheel, and a spring that rotates the pawl in one direction. It is equipped with an engagement release plate that controls engagement between the pawl and the ratchet wheel.
This ratchet tool has a ratchet wheel on both sides of the release plate, so that the ratchet wheel and the release plate can rotate with each other.
Since two ratchet wheels and one release plate are stacked in three layers and arranged inside the casing, there is a drawback that the overall thickness becomes thicker.

B. Structure and purpose of this invention In order to eliminate these drawbacks, this invention reduces the overall thickness by incorporating a rotating plate in the center of the tilting plate, and also simplifies and strengthens the mechanism. To provide a ratchet tool for furniture that has improved durability and is easy to install.

C. Example Hereinafter, an example of this invention will be described based on the drawings.

The ratchet tool shown in FIG.
, a tilting plate 2, a rotating plate 3, a rotating shaft 4, and a spring 5.

As shown in FIG. 1, the lower end of the tilting plate 2 is mounted in the casing 1 through a pin 6 so as to be tiltable to a desired angle, and an engagement hole 7 in which the rotary plate 3 can be accommodated is opened in the center. There is. The rotating plate 3 is disposed in the engagement hole 7 of the tilting plate 2, and the rotating shaft 4 is fixed so as not to rotate. The rotation shaft 4 passes through the casing 1 rotatably.

The spring 5 is an expansion spring having an eight-shaped overall shape, and a bent portion thereof is inserted into a stop pin 8 fixed to the upper part of the casing 1.

In this specification, up and down, left and right shall be determined based on the drawings.

The bent portion of the spring 5 formed in a figure eight shape is formed into an annular shape, and this portion is inserted into the stop pin 8. The spring 5 has both left ends opened to each other by its own elasticity, and its upper end presses against the side wall 9 of the casing, and its lower end 10 presses against the left upper corner of the tilting plate 2.
The tilting plate 2 has a locking recess 11 in which the tip of the spring 5 can be locked at the upper left corner, and the upper part of the tilting plate 2 is moved to the left as shown in FIG. In this state, the lower end of the spring 5 is locked in the locking recess 11, and the rotation of the tilting plate 2 is stopped.

As shown in FIGS. 2 and 3, when the upper part of the tilting plate 2 is slightly rotated to the right, the spring 5
The lower end is removed from the locking recess, and the lower end of the spring presses the upper left corner of the tilting plate 2, causing the upper part of the tilting plate 2 to rotate to the right.

Gear-shaped projections and depressions 12 that mesh with each other are formed in the engagement hole 7 of the tilting plate 2 and the outer periphery of the rotation plate 3. The gear-shaped unevenness 12 separates from each other when the tilting plate 2 is rotated to the left as shown in FIG. 1, and when the tilting plate 2 is rotated to the right as shown in FIG. They are unevenly carved on the left so that they interlock with each other.

The gear-shaped unevenness 12 provided on the rotating plate 3 has more teeth than the gear-shaped unevenness 12 of the meshing hole 7, and the rotating plate 3
rotates at a certain pitch and then stops.

Further, on the outer periphery of the meshing hole 7 and the rotating plate 3, the tilting plate 2 is rotated to the left to the position shown in FIG.
From the position shown in FIG. 1, rotate the tilting plate 2 to the right as shown in FIG.
A rotating recess 13 and a rotating protrusion 14 are provided for removal from the housing.

In the ratchet tool shown in FIGS. 1 to 3, the lower peripheral edge of the engagement hole 7 is formed with a large inner diameter to form a rotating recess 13, and extends over a shorter circumference than the rotating recess 13. Accordingly, the outer diameter of the lower outer periphery of the rotating plate 3 is formed to be large, and the rotating convex portion 14 is provided.

The ratchet tool shown in FIGS. 1 to 3 is entirely made of metal, and has a tilting plate 2 formed with a rotating recess 13 and a rotating plate 3 with a rotating protrusion 14. On the contrary, as shown by the chain line in FIG. 1, it is also possible to form a rotation recess A on the outer periphery of the rotation plate 3 and a rotation protrusion B in the engagement hole of the tilt plate 2. .

As shown in FIG. 4, the casing 1 is provided with a side wall 9 at its periphery.

Figures 5 through 7 show examples of where the ratchet tool is used. FIG. 5 shows ratchet tools installed between the footrest 17 and the seat 15, between the backrest 16 and the seat 15, between the pillow material 18 and the backrest 16, and between the armrest 19 and the backrest 16. A chair is shown. Fig. 6 shows a chair with a ratchet device attached between the armrest 19 and the seat 15, and Fig. 7 shows a table with the top plates 20 on both sides attached to the central top plate via the ratchet devices. has been done.

Figures 5 through 7 only illustrate the locations where the ratchet tool is attached, and the ratchet tool can also be used on other parts of furniture.

D. Operation The operation when the ratchet tool configured as described above is attached to a seat chair as shown by the chain line in FIG. 1 will be explained. In FIG. 1, the casing 1 is fixed to a seat 15, and the rotation shaft 4 is fixed to a backrest 16.

When the backrest 16 is completely raised, the rotating plate 3 rotates to the left, as shown in FIG.
The right end of 4 hits the left side of the rotation recess 13 of the tilting plate 2, the tilting plate 2 is rotated to the left, and the lower end 10 of the spring is hooked to the locking recess 11 of the tilting plate 2. , the rotation of the tilting plate 2 is stopped.

In this state, the engagement hole and the gear-shaped unevenness 12 on the outer periphery of the rotating plate are separated from each other, and the rotating plate 3 is in a state where it can freely rotate to the right, that is, in the direction in which the backrest 16 is tilted down.

When the backrest 16 is completely reclined in this state, the left end of the rotating protrusion 14 of the rotating plate 3 hits the left side of the rotating recess 13, and the tilting plate 2 is rotated to the right.

At this time, the lower end of the spring is removed from the locking recess 11, and the spring 5 presses the upper left corner of the tilting plate 2 to elastically rotate the tilting plate 2 to the right. Tilt plate 2
The upper right corner touches the side wall of the casing.

In this state, if you raise the backrest 16 slightly,
After passing through the state shown in FIG. 3, the rotating plate 3 is rotated to the position shown in FIG. 2. As shown in FIG. 3, when the rotating plate 3 rotates to the left, the tilting plate 2 is rotated to the left until the gear-shaped unevenness 12 is disengaged. As shown in Fig. 2, gear-shaped unevenness 1
2 are in mesh with each other, the rotating plate 3 cannot be rotated to the right. This is because, in the position shown in FIG. 2, the spring 5 pushes the top of the tilting plate to the right, and the right side of the tilting plate 2 hits the side wall 9 of the casing and cannot rotate to the right, causing the gear-like unevenness 12 It doesn't work because they can't leave each other.

Every time the backrest 16 is raised one step, the engagement of the gear-shaped projections and depressions 12 is transferred to the adjacent projections and depressions through the position shown in FIG. 2, and the backrest 16 is gradually raised. Return to the process when the backrest 16 is completely raised.

E Effects The ratchet tool of this invention has a rotating plate and a tilting plate that can rotate relative to each other or stop at a predetermined rotational position, and the rotating plate and the tilting plate are on the same plane, that is, the rotating plate is built in the center of the tilting plate. Because of this, the entire ratchet tool can be made extremely thinner than conventional ratchet tools, and it is easy to install and does not adversely affect the external design.

In addition, there is no need to stack multiple plates in multiple layers as in the past, and since the tilting plate and rotating plate have a single layer structure, even if they are made thicker, the total thickness will not be that much, and the tilting The plate and rotating plate can be thickened to make them sturdy, a durable and failure-free ratcheting tool can be realized, and the overall mechanism and assembly can be made simple and inexpensive.

[Brief explanation of drawings]

Figures 1 to 3 are front views of the ratchet side showing the opened state with one side of the casing removed, Figure 4 is a sectional view taken along the - line of the ratchet tool shown in Figure 1, and Figures 5 to 7. FIG. 2 is a side view and a front view showing an example of a place where it is used. 1... Casing, 2... Tilting plate, 3... Rotating plate, 4... Rotating shaft, 5... Spring, 6... Pin, 7
...Matching hole, 8... Stop pin, 9... Side wall, 10...
...lower end, 11...locking concave depression, 12...gear-like unevenness, 13...rotation concave depression, 14...rotation protrusion, 15
...Seat, 16...Backrest, 17...Foot rest,
18...Pillow material, 19...Armrest, 20...Top plate, A
... Rotating recess, B... Rotating convex part.

Claims (1)

[Claims for Utility Model Registration] (1) Consisting of a casing, a tilting plate, a rotating plate, a rotating shaft, and a spring. When installed, a mating hole in which a rotating plate can be accommodated is opened in the center part, and the rotating plate is disposed in the mating hole of the tilting plate, and the rotating shaft is fixed so that it does not rotate. The rotating shaft passes through the casing in a rotatable manner, and the spring uses its own elasticity to rotate the tilting plate in a fixed direction, and also rotates the tilting plate in the opposite direction rotated by the spring. In order to lock the plate in that position, it is arranged between the tilting plate and the casing, and the engagement hole and the outer periphery of the rotary plate are provided with springs that press against each other when the tilting plate is elastically pressed. Gear-like unevenness that is unevenly distributed on the contact surface and meshes with each other is formed, and furthermore, a tilting plate is rotated with a certain amount of play between the meshing hole and the outer periphery of the rotating plate when the rotating plate is rotated. A rotation recess and a rotation protrusion are formed, and the rotation protrusion is disposed within the rotation recess and rotates in a direction opposite to that in which the tilting plate is rotated by the spring. When the gear-like unevenness between the engaging hole and the rotating plate is separated and the rotating plate is rotated by the required angle with respect to the tilting plate. A ratchet tool for furniture, wherein the rotary plate is configured to be rotatable only in a fixed direction relative to the tilting plate when the rotary plate is elastically pressed against the tilting plate. (2) An expansion spring in which the spring is bent into a V-shape and both ends are elastically expanded.The bent part is formed into an annular shape, and this part is attached to the casing via a stop pin. One end presses the side wall of the casing, the other end presses a corner of the tilting plate, and the corner of the tilting plate has a locking recess into which one end of the spring can be locked. A ratchet tool for use in furniture as set forth in claim (1) of the registered utility model. (3) A portion of the engaging hole of the tilting plate is formed with a large inner diameter to provide a rotation recess, and a rotation convex portion is formed on the rotation plate located within this rotation recess. A ratcheting tool used for furniture as set forth in claim (1) of the utility model registration.