JPH065548U - Backrest angle adjustment device for seats and chairs - Google Patents

Abstract

(57) [Abstract] [Purpose] In the backrest angle adjusting device, when the second metal fitting on the backrest side is stopped in an upright state, even if a strong force in the folding direction is inadvertently applied, the parts will not be damaged and will remain engaged. It should be able to be stopped and the rotating part should always be able to rotate smoothly. [Structure] A ratchet gear 4 at the tip of a connecting pipe portion 5 of a backrest-side second metal fitting 2 is pivotally supported between both side plate portions 6 of a connecting pipe portion 3 of a first metal fitting 1 on a seat plate side. With
Claw piece 7 biased to mesh with the ratchet gear 4
And a backrest angle adjusting device such as a seat chair provided with a cam plate 8 capable of disengaging the engagement of the claw piece 7, the second fitting 2 rotated to a predetermined angle in the upright direction, and the connecting pipe 5 thereof.
The first metal fitting 1 can be locked at the side edge 11 of the seam 10 of
An upper plate portion 12 for preventing forward tilting in which the side edge 13 serves as a stopper is provided between the upper portions of both side plate portions 6 ahead of the connecting pipe portion 3 of FIG.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a device for adjusting the tilt angle of a backrest, such as a chair and a sofa bed with an adjustable backrest angle.

[0002]

[Prior art]

 Conventionally, as a backrest angle adjusting device for a chair or the like, as shown in FIG. 5, for example, a back pipe is provided between both side plate parts 6 on the front side of a connecting pipe part 3 formed by rolling the plate material of the first metal fitting 1 on the seat plate side. The ratchet gear 4 at the tip of the connecting pipe portion 5 of the second metal fitting 2 on the leaning side, which is also a rolled-up plate material, rotatably supports the ratchet gear 4 and is also biased by a spring 16 to engage with the ratchet gear 4. 7 and a cam plate 8 capable of disengaging the engagement of the claw piece 7 are pivotally supported. (See also, for example, Japanese Utility Model Publication No. 59-5399 and Japanese Utility Model Publication No. 59-2018).

As shown in FIG. 5, the means for preventing the backrest from leaning forward in the backrest angle adjusting device and the means for stopping the second metal fitting 2 when the second fitting 2 is rotated up to a predetermined angle in the standing direction are shown in FIG. As described above, when the second metal fitting 2 on the backrest side is rotated, the projecting piece 17 provided on the ratchet gear 4 of the second metal fitting 2 contacts the stopper surface of the cam plate 8 to rotate the cam plate 8, and the cam plate 8 is rotated. The protrusion 18 formed on the peripheral edge hits the claw piece 7 and presses the claw piece 7 against the inner bottom surface of the first metal fitting 1 on the seat plate side so that the rotation of the second metal fitting 2 is stopped. (See also the above publication).

[0004]

[Problems to be solved by the device]

 However, as shown in FIG. 5, in the above-described front fall prevention means, the cam plate 8 is rotated by the rotation of the second metal fitting 2 on the backrest side, and the projection 18 at the peripheral edge abuts on the pawl piece 7. Alternatively, the claw piece 7 may be deformed or worn, and the cam plate 8 may not be locked by the claw piece 7, and the rotation of the second metal fitting 2 may not be stopped.

Further, when the second metal fitting 2 on the backrest side is in the upright state, if a strong force is applied in the direction of folding carelessly, the second metal fitting 2 is further rotated, and the joint pipe portion 5 of the metal fitting 2 is joined. The side edge 11 of 10 may come into contact with the peripheral edge of the cam plate 8 which is locked as described above, and the cam plate 8 bites into the joint 10 and the second metal fitting 2 may not move. .

Further, since the upper portion between the both side plate portions 6 of the connecting pipe portion 3 of the first fitting 1 on the seat plate side is open, each connecting pipe portion 3 of the first fitting 1 and the second fitting 2 is opened. When welding the seat plate side frame and the backrest side frame (not shown) to 5 and 5, spatter (slag and metal particles at the time of welding) is fitted from the opening, ratchet gear 4, cam plate 8 and claws. It sometimes became difficult for the piece 7 etc. to rotate.

Moreover, although this angle adjusting device is covered with urethane foam or the like, since the ratchet gear 4 is exposed from the opening, when the second metal fitting 2 on the backrest side is rotated from the deployed state to the upright state. In some cases, urethane foam or the like may fit between the side plate portions 6 through the opening. Therefore, there is a problem that urethane foam or the like may bite into the ratchet gear 4 to cause a rotation failure.

The present invention is intended to solve the problems of the above-described conventional backrest angle adjusting devices such as seat chairs. That is, the first object of the present invention is to reduce the cost with a simple structure in the backrest angle adjusting device, and when the second metal fitting on the backrest side is stopped while standing upright, a strong force in the folding direction is inadvertently applied. Even if added, damage is not caused in each part at the time of contact, and the cam plate does not bite into the joint of the edge of the opening of the second metal fitting so as to maintain smooth rotation.

In addition, the second purpose is, in the backrest angle adjusting device, between the both side plates of the connecting pipe portion of the second fitting on the seat plate side, spatter during welding, urethane foam covering the device, etc. Is to prevent the ratchet gear from entering, so that the ratchet gear, cam plate, and claw pieces can always rotate smoothly.

[0010]

[Means for Solving the Problems]

 The seat back angle adjusting device according to the present invention includes a connecting pipe portion 3 of the first metal fitting 1 on the seat plate side, and a connecting pipe portion 3 of the second metal fitting 2 on the backrest side between both side plate portions 6 on the front side. 5 A seat chair, etc., which supports the ratchet gear 4 at the tip of the shaft 9 and which is provided with a claw piece 7 biased to mesh with the ratchet gear 4 and a cam plate 8 capable of disengaging the mesh of the claw piece 7. In the backrest angle adjusting device of the first fitting 1, the second fitting 2 rotated in the standing direction up to a predetermined angle can be locked by the side edge 11 of the joint 10 of the fitting pipe 5, and the connecting fitting of the first fitting 1 can be locked. An upper plate portion 12 for preventing forward tilting, in which the side edge 13 serves as a stopper, is provided between the upper portions of both side plate portions 6 ahead of the portion 3.

In the above-mentioned configuration, the upper plate portion 12 for preventing forward tilt may be integrally formed by bending the both side plate portions 6 of the first metal fitting 1 inwardly, but it is also possible to fix the metal plate by covering it from above. You may wear it. Further, it is preferable that the length thereof is such that the opening above the both side plate portions 6 covers at least the gear portion of the ratchet gear 4. In the drawing, 14 is a seat plate side frame, 15 is a backrest side frame, 16 is a spring, and 17 is a protrusion formed on the side surface of the ratchet gear 4.

[0012]

[Action]

 As described above, this backrest angle adjusting device is provided with the upper plate for preventing the forward tilting in which the side edge 13 serves as a stopper between the upper portions of the both side plate portions 6 ahead of the connecting pipe portion 3 of the first fitting 1 on the seat plate side. A section 12 is provided.

1) Therefore, when the second metal fitting 2 on the backrest side is rotated up to a predetermined angle in the upright direction, the side edge 11 of the seam 10 of the connecting pipe 3 serves to prevent the forward tilt. The side edge 13 as a stopper of the upper plate portion 12 is abutted and locked (see FIG. 1). At this time, the upper plate portion 12 is formed between the upper portions of the both side plate portions 6 ahead of the connecting pipe portion 3 of the first fitting 1 on the seat plate side, and the width thereof is equal to the thickness of the cam plate 8 or the like. Since it is much larger in comparison (see FIG. 2), the side edge 13 of the upper plate 12 does not bite into the joint 10 of the second metal fitting 2. Therefore, the rotation of the second metal fitting 2 is not disabled.

2) When manufacturing a chair or the like, the upper plate portion 12 provided between the upper portions of the both side plate portions 6 allows the first metal fitting 1 and the second metal fitting 2 to have the seat plate side frame 14 and the backrest. Spatters generated when welding the side frames 15 are prevented from entering between the side plate portions 6. Therefore, unlike the conventional case, the ratchet gear 4, the claw piece 7, the cam plate 8 and the like do not become difficult to rotate due to spatter, and they always rotate smoothly.

3) Further, even after the angle adjusting device is wrapped with urethane foam or the like, the urethane foam or the like is removed by the long upper plate portion 12 which is long enough to cover at least the gear portion of the ratchet gear 4. It is prevented from entering between the side plate portions 6. Therefore, unlike the prior art, the rotation is not hindered by the entry of urethane foam or the like between the both side plate portions 6, and the rotation can be performed smoothly from this surface as well. It goes without saying that the actions 2) and 3) are exhibited as the length of the upper plate portion 12 covering the upper portions of the both side plate portions 6 increases.

In this backrest angle adjusting device, when the second metal fitting 2 on the backrest side is rotated in the upright direction, the cam plate 8 is rotated by being pushed by the protrusion 17 provided on the side surface of the ratchet gear 4. Since the claw piece 7 biased by the spring 16 is disengaged from the ratchet gear 4, it can be rotated. When the upper plate portion 12 for preventing forward tilting is rotated further to the predetermined standing state, the further forward rotation is locked (see FIG. 1). When the second metal fitting 2 is rotated from that state in the developing direction, the cam plate 8 pushed by another projecting piece 17 provided on the side surface of the ratchet gear 4 separates the pawl piece 7 from the ratchet gear 4. Therefore, it can be rotated.

In order to obtain a desired inclination angle of the second metal fitting 2, the claw piece 7 urged by the spring 16 is ratcheted by rotating the second metal fitting 2 from the horizontal state to the desired angle in the standing direction and stopping it. Since it meshes with the gear 4, it is locked in that state and the desired inclination angle is maintained. The tilting angle is released by temporarily rotating the second metal fitting 2 to the upright state, and by using the cam plate 8 to disengage the pawl piece 7 from the ratchet gear 4.

[0018]

【Example】

 In the embodiment shown in FIGS. 1 and 4, the upper plate portion 12 for preventing forward tilting is integrally formed so that the upper portions of the both side plate portions 6 are bent inward and brought into contact with each other. The size is such that the openings above the side plate portions 6 are sufficiently covered. Therefore, in this embodiment, not only is the forward leaning of the second metal fitting 2 on the backrest side prevented from standing up, but also the effect of preventing spatter and urethane foam from entering between the side plate portions 6 is great.

Although not shown, a metal plate different from the both side plate portions 6 of the first metal fitting 1 on the seat plate side is prepared for the upper plate portion 12 for preventing the forward tilt thereof. You may cover so that it may cover from the top. If the main purpose of the present invention is to prevent the second metal fitting 2 on the backrest side from tilting forward when the second metal fitting 2 is in an upright state, the length of the upper plate portion 6 may be slightly shortened.

[0020]

[Effect of device]

 As is apparent from the above, the backrest angle adjusting device for seats and chairs according to the present invention is provided with a side edge 13 between upper portions of both side plate portions 6 on the connecting pipe portion 3 of the first fitting 1 on the seat plate side. An upper plate portion 12 is provided for preventing forward tilting which serves as a stopper.

[0021] Therefore, unlike the conventional one, the side edge of the upper plate portion has a large area with respect to the seam side edge of the connecting pipe of the second metal fitting on the backrest side while achieving cost reduction with a simple structure. It will come into contact with and will not go into the joint. Therefore, even if a strong force is further applied in the folding direction when the second metal fitting is in an upright position, the contact parts will not be damaged, and the side end surface of the cam plate will be aligned with the second metal fitting. It does not bite into the eyes and can prevent the second metal fitting from becoming unrotatable.

Similarly, by the upper plate portion, spatters generated when welding the seat plate side frame and the backrest side to the connecting pipe portions of the first metal fitting and the second metal fitting, urethane foam coated with the angle adjusting device, and the like. It is possible to prevent the cloth from entering between the both side plates. Therefore, unlike the conventional one, it is possible to prevent the ratchet gear, the cam plate, the claw piece and the like from being unable to rotate and the second metal fitting from having a defective rotation. This is more effective as the length that the upper plate portion covers between the upper portions of both side plate portions is longer.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of an essential part of an embodiment of a backrest angle adjusting device for a chair or the like according to the present invention when standing up at a predetermined angle.

FIG. 2 is a perspective view of the first metal fitting on the backrest side of the embodiment shown in FIG.

FIG. 3 is a partially cutaway front view of a main part of the embodiment shown in FIG. 1 in a deployed state.

FIG. 4 is a front view in which the embodiment shown in FIG. 1 is used for a seat chair.

FIG. 5 is a partially cutaway front view of a main part of a conventional example of a backrest angle adjusting device such as a seat chair when standing up at a predetermined angle.

[Explanation of symbols]

1-First Metal Fitting 2-Second Metal Fitting 3-Connecting Pipe Part 4-Ratchet Gear 5-Connecting Pipe Part 6-Side Plate Part 7-Claw Piece 8-Cam Plate 9-Shaft 10-Match 11-Side Edge 12-Upper plate part 13-Side edge 14-Frame 15-Frame 16-Spring 17-Protrusion

Claims (2)

[Scope of utility model registration request] 1. A ratchet gear 4 at the tip of a connecting pipe portion 5 of a backrest side second metal fitting 2 is provided between a pair of side plate portions 6 at the front side of a connecting pipe portion 3 of a first metal fitting 1 on the seat plate side, and a shaft 9 is provided. The claw piece 7 that is supported and is urged to mesh with the ratchet gear 4.
In a backrest angle adjusting device such as a seat chair provided with a cam plate 8 capable of disengaging the engagement of the claw piece 7, the second metal fitting 2 rotated up to a predetermined angle in the standing direction is connected to the connecting pipe 5. An upper plate for preventing forward tilting in which the side edge 13 serves as a stopper between the upper portions of both side plate portions 6 ahead of the connecting pipe portion 3 of the first metal fitting 1 so that the side edge 11 of the seam 10 can be locked. A backrest angle adjusting device for a chair or the like, which is provided with a portion 12. 2. The seat chair or the like according to claim 1, wherein the upper plate portion 12 is configured to cover the upper portion with a length such that both side plate portions 6 cover at least the gear portion of the ratchet gear 4. Backrest angle adjustment device.