JPS5920120Y2 - Ratchet fittings for seat chairs - Google Patents

Description

[Detailed description of the invention] The present invention relates to a ratchet fitting for a seat chair, more specifically, a first metal fitting having a pair of side walls facing each other at a predetermined interval, and a ratchet formed at the edge of each side wall. A cam plate is inserted between the side walls so as to be relatively rotatable, and the first metal fitting is pivotally supported by a shaft to a second metal fitting having a pawl that engages with the ratchet, and the first metal fitting is connected to the second metal fitting. This invention relates to a ratchet fitting for a chair that can be rotated within a certain range.

Conventionally, in this type of ratchet fitting for a seat chair, in order to enable a cam plate inserted between a pair of ratchets in a first metal fitting to rotate relative to the ratchet, a protruding portion extends radially from the outer periphery of the cam plate. In addition to projecting outward, a contact portion is provided at the ratchet base of the first metal fitting such that the contact portion of the first metal fitting comes into contact with the protruding portion of the cam plate when the first metal fitting is rotated. There is.

However, as described above, the cam plate and the first metal fitting are separated from each other before they are assembled into the second metal fitting, so when managing parts, it is necessary to use the second metal fitting with a pair of ratchets. In addition, it is necessary to match the number of cam plates and store them separately, and during complex assembly work in which the cam plate is inserted between the ratchets and the first metal fitting is pivoted to the second metal fitting by the shaft, it is necessary to store the cam plates separately between the ratchets. It is necessary to be careful not to insert the cam plate in the wrong direction, and to ensure that the cam plate inserted between the ratchets does not fall off the ratchet during the pivoting work. There were many points to be noted, and there were problems with poor workability.

This invention was devised to solve the above problems.
The purpose is to set and store the first metal fitting with a pair of ratchets and the cam plate, making it easy to manage the parts, and to eliminate the worry of the cam plate falling out from between the ratchets during assembly. To provide a ratchet fitting for a seat chair that can be assembled quickly.

That is, the present invention has a pair of side walls facing each other at a predetermined interval, and a cam plate is inserted between the side walls of the first metal fitting so as to be relatively rotatable, and a ratchet is formed at the end edge of each side wall. At the same time, the second metal fitting is pivotally supported by a shaft to a second metal fitting having a claw that engages with the ratchet, so that the first metal fitting can be rotated within a certain range with respect to the second metal fitting. In the ratchet fitting for use, a regulating groove is provided on one of the ratchet and the cam plate, the groove extending in the rotational direction of the first fitting rotating around the axis of the shaft, and regulating the rotation of the cam plate with respect to the ratchet. , on the other hand, a retaining piece extending in the direction of the regulating groove and having a length longer than the amount of axial movement of the cam plate with respect to the ratchet is provided, and the retaining piece is engaged with the regulating groove. The cam plate is characterized in that the cam plate is irremovably incorporated into the ratchet.

The details of the present invention will be explained below based on the drawings showing embodiments.

In Fig. 1, 1 is a first metal fitting that is attached to the frame A that constitutes the back plate of the seat chair, 2 is a second metal fitting that is attached to the frame B that constitutes the seat plate of the chair, and both face metal fittings 1 and 2 are the same. It is formed by bending a sheet of metal.

The first metal fitting 1 has ratchets 4, 4 formed at each end of a pair of side walls 3, 3 facing each other at a predetermined interval, as shown in Fig. 2.4.5. Two metal fittings 2
As shown in FIGS. 3 to 5, the device has side walls 5, 5 facing each other at a distance that allows the side walls 3, 3 of the first metal fitting 1 to be inserted therein, and ratchets 4, 4 are installed in the side walls 5, 5. The engaging pawls 6 are pivotally supported, and a bullet 7 is used to urge the ratchets 4 in the 4 directions.

Then, the cam plate 8 is inserted between the side walls 3, 3 of the first metal fitting 1 having the ratchets 4, 4 so as to be relatively rotatable, and the first metal fitting 1 and the cam plate 8 are connected by the shaft 9 to the side walls 3, 3 of the first metal fitting 1. The first metal fitting 1 is pivotally supported on the second metal fitting 2 so that the first metal fitting 1 can be rotated within a certain range with respect to the second metal fitting 2 as described later.

2.4.5, the cam plate 8 is extended in the rotational direction of the first metal fitting 1 rotating around the axis of the shaft 9, and the cam plate 8 is Ratchet 4,4
A restriction groove 10 is provided in one of the ratchets 4 to restrict the rotation of the cam plate 8 relative to the ratchet 4. A piece 11 is provided, and the retaining piece 11 is engaged with the regulating groove 10, so that the cam plate 8 is irremovably incorporated into the ratchets 4, 4.

The ratchets 4, 4 have four valleys, and the cam plate 8 has the same pitch as the ratchets 4, 4, and
It has four teeth higher than ratchets 4 and 4.

The ratchets 4, 4 and the cam plate 8 are arranged so that the teeth of the cam plate 8 are opened half a pitch apart from the position where the teeth of the ratchet 4 fill the valleys of the ratchets 4, 4 due to the relationship between the regulating groove 10 and the retaining piece 11. This allows for relative rotation between the two positions.

That is, when the first metal fitting 1 is rotated in the clockwise direction of collapse with respect to the second metal fitting 2 as shown in FIG. 4, the retaining piece 11 is brought into contact with the clockwise end of the regulating groove 10, ratchet 4
, 4 except for the right end trough are filled with the teeth of the cam plate 8 so that the pawl 6 is allowed to ride over the ratchet 4.4 without engaging it.

When the first metal fitting 1 is rotated in the counterclockwise upright direction with respect to the second metal fitting 2 as shown in FIG. The teeth of the plate 8 are overlapped with the ratchets 4, 4 to force each valley to open.

Reference numeral 12 denotes a control means for suppressing the sliding of the pawl 6 formed at an intermediate position in the rotational direction on the top of the teeth of the cam plate 8.

Further, reference numeral 13 denotes a bushing which is attached through the cam plate 8, and the shaft 9 is inserted through the bushing 13.

In this case, since the bushing 13 changes the amount of movement of the cam plate 8 between the ratchets 4, 4, the length of the retaining piece 11 is made longer than the amount of movement that has changed in this way.

Further, 14 is a tube for attaching the first and second metal fittings 1 and 2 to the backrest plate and the seat plate.

As described above, the cam plate 8 is provided with the regulation groove 10, and the retaining piece 11 that engages with the regulation groove 10 is provided from one side wall 3 of the first metal fitting 1. Since the first metal fitting 1 and the cam plate 8 can be integrated into the ratchets 4, 4 in a non-separable manner, the first metal fitting 1 and the cam plate 8 can be made into one single component by setting the cam plate 8 as a set when manufacturing the first metal fitting 1. ,Therefore, it has the effect of reducing the number of parts by one point,
Parts management becomes easier, and the insertion direction of the cam plate 8 inserted between the ratchets 4 during complicated assembly work in which the first metal fitting 1 is pivotally supported together with the cam plate 8 to the second metal fitting 2 by the shaft 9. There is no need to worry about making a mistake, and there is no need to worry about the cam plate 8 coming off from between the ratchets 4 and 4, and the assembly can be easily completed.

Furthermore, the regulating groove 10 of the cam plate 8 and the engagement piece 11 of the first metal fitting 1 allow the teeth of the cam plate 8 to be positioned in the troughs of the ratchet 4.4 and in the open position, which is a half pitch away. Since the first metal fitting 1 is allowed to rotate relative to the second metal fitting 2, as shown in FIG. ratchet 4,
The troughs 4 are held in an open state, and the claws 6 can be engaged with any troughs, allowing the backrest plate of the chair to be adjusted to a desired angle.

Further, when it is desired to adjust the angle of the backrest plate in the direction of lodging, the first metal fitting 1 is once rotated half a pitch in the counterclockwise direction, and the claw 6 is placed on the restraining means 12 of the cam 8.

Then, as shown in FIG. 4, the first metal fitting 1 is rotated clockwise relative to the second metal fitting 2.

In this way, the retaining piece 11 comes into contact with the clockwise end of the regulating groove 10, and the troughs of the ratchets 4, 4 are filled with the teeth of the cam plate 8, so that the pawl 6 touches the troughs of the ratchets 4.4. Ratchet 4,4 over the desired valley without falling into the
can reach the peak of the tooth.

In this state, by returning the first metal fitting 1 counterclockwise, the pawl 6 can be engaged with the desired valley.
The angle of the backrest plate can be easily adjusted.

In the above explanation, the regulating groove 10 is provided on the cam plate 8 and the retaining piece 11 is provided on one of the ratchets 4, but the retaining piece 11 may be provided on both ratchets 4, or the regulating groove 11 is provided on both ratchets 4. 10 may be provided on the ratchet 4, and the engaging piece 11 may be provided on the cam plate 8.

In addition, although the first metal fitting 1 is provided on the backrest plate and the second metal fitting 2 is provided on the seat plate, conversely, the first metal fitting 1 may be provided on the seat plate and the second metal fitting 2 may be provided on the backrest plate. Needless to say.

Further, by using the cam plate 8, when the first metal fitting 1 is rotated in one direction with respect to the second metal fitting 2, the pawl 6 is switchably engaged with the grooves of the ratchets 4, 4, and the first metal fitting 1 is rotated in the other direction. The structure that allows the pawl 6 to ride over the ratchets 4 and 4 without falling into the valleys of the ratchets 4 and 4 during rotation is not limited to the structure described above, but can be applied to various other structures. can.

As described above, the present invention has a pair of side walls that face each other at a predetermined interval, and a cam plate is mounted so as to be relatively rotatable between the side walls of the first metal fitting, which has a ratchet formed at the end edge of each side wall. A regulating groove is provided on one of the ratchet of the first metal fitting and the cam plate, and extends in the rotational direction of the second metal fitting and restricts rotation of the cam plate relative to the ratchet, and a regulating groove is provided on the other side of the ratchet of the first metal fitting and the cam plate. a retaining piece extending in the direction and having a length longer than the axial movement amount of the cam plate with respect to the ratchet, the retaining piece is engaged with the regulating groove, and the cam plate is attached to the ratchet. On the other hand, since the cam plate is built in as if it cannot be separated, the cam plate can be assembled as a set when manufacturing the first metal fitting, which makes parts management easier, and the first metal fitting can be attached to the shaft together with the cam. When performing complex assembly work involving pivoting to the second metal fitting, there is no need to worry about inserting the cam plate in the wrong direction between the ratchets, and there is no fear that the cam plate will fall off between the ratchets, making the assembly easy to complete. can.

Moreover, while having the above-mentioned effects, the relative rotation of the cam plate with respect to the ratchet can be restricted by the regulating groove and the retaining piece provided on the ratchet and the cam plate. When rotating in one direction over a certain range, the pawl is switchably engaged with the valley of the ratchet, and when rotating in the other direction, the pawl can be moved over the ratchet without falling into the valley of the ratchet. This makes it possible to arbitrarily adjust the corner plate of the backrest plate relative to the seat plate of the chair.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is an explanatory diagram schematically showing the relationship with the seat, and Fig. 2 is a perspective view of the cam plate installed between the ratchets of the first metal fitting. Figures 3 and 3 are perspective views of the second metal fitting with claws, and Figures 4 and 5 are cross-sectional explanatory views showing the state in which the first metal fitting is rotated with respect to the second metal fitting. 1...First metal fitting, 2...Second metal fitting, 3
...Side wall, 4...Rachit, 6...
...Claw, 8...Cam plate, 9...Shaft,
10...Regulation groove, 11...Engagement piece.

Claims (1)

[Scope of utility model registration request] A cam plate is relatively rotatably inserted between the side walls of the second metal fitting, which has a pair of side walls facing each other at a predetermined interval and has a ratchet formed at the end edge of each side wall. In the ratchet metal fitting for a seat chair, the metal fitting is pivotally supported by a shaft to a second metal fitting having a pawl that engages with the ratchet, and the first metal fitting can be rotated within a certain range with respect to the second metal fitting. one of the ratchet and the cam plate, extending in the rotational direction of the first metal fitting that rotates around the axis of the shaft, and
A regulating groove for regulating rotation of the cam plate relative to the ratchet is provided, and a retaining piece extending in the direction of the regulating groove and having a length longer than the axial movement amount of the cam plate relative to the ratchet is provided on the other side. A ratchet metal fitting for a seat chair, characterized in that the retaining piece is provided and the retaining piece is engaged with the regulating groove so that the cam plate is irremovably incorporated into the ratchet.