JP3123363U - Chair with reclining mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chair with a simple structure excellent in feeling of use having an elastic reclining function on a back frame constituting a backrest.
A coil spring 6 is provided in an intervening state at a lower portion of a support column portion of a back frame 3 to give an elastic reclining function to an upper portion of the back frame 3. The coil spring 6 has an intermediate portion in the length direction as a closing spring portion 6a, and both end portions as opening spring portions 6b and 6c. The connecting end portion of the back frame 3 is inserted into the opening spring portions 6b and 6c. It is fixed by the weld 7.
[Selection] Figure 1

Description

  The present invention relates to a reclining chair having a seat portion and a backrest portion, in which a rearward tilt angle of the backrest portion can be arbitrarily changed, and particularly to a chair provided with a reclining mechanism suitable as a seat chair.

  In general, this type of reclining chair is connected to the seat frame so that the back complaint can be changed in relative angle via a joint fitting such as a ratchet gear, and the back tilt angle of the backrest depends on the usage condition of the user. Can be adjusted arbitrarily.

  However, in such a chair that can adjust the backrest angle, the backrest portion is fixed at the set angle after adjustment, and the user rests with the weight resting on the backrest portion. In some cases, it was not always possible to obtain a suitable feeling of use.

  Therefore, conventionally, a chair provided with an elastic reclining mechanism capable of giving an elastic rocking motion to the backrest according to a user's leaning load has been proposed.

As one typical example, as shown in the following Patent Document 1, a thick coil spring is interposed in the lower part of the column part of the back frame, and the upper part of the back frame is supported so as to be elastically tiltable. . As another proposed example, as shown in Patent Document 2, a spiral spring is provided in the lower region of the back frame, and the upper frame is tilted elastically by the spring elastic force of the spiral spring. The chair.
Microfilm of Japanese Utility Model No. 59-56465 (Japanese Utility Model Application No. 60-167559) JP 2004-329824 A

  However, in the configuration described in Patent Document 1, when the weight is applied to the backrest and the backward tilting behavior is caused, the coil spring and the back portion inserted or internally fitted at both ends thereof are used. A phenomenon occurs in which the connection end of the frame rubs violently, and an unpleasant “key key” or “crimp” is generated. For this reason, the actual situation is that the chair provided with such an elastic reclining mechanism using the flexural elastic force of the coil spring has been impeded.

  On the other hand, the elastic reclining mechanism using the spiral spring as shown in Patent Document 2 requires a large spring force that can resist the user's drooping load applied to the backrest. Thus, the reclining mechanism itself becomes bulky, and when attached to a part of the back frame, it not only obstructs the covering by the cushion body, but also keeps the backrest upright at a predetermined angle when no load is applied. Therefore, the construction of the stopper mechanism is a little complicated, and the actual situation is that it has not yet been put into practical use.

  The present invention is intended to improve a chair equipped with an elastic reclining mechanism using a coil spring, which is the simplest structurally and less prone to failure in the background of the existence of the prior art as described above. Elastic reclining that produces elastic and smooth reclining behavior according to the weight load of the user who is drowning, can be excellent in feeling of use, and does not cause unpleasant metal rubbing noise or friction noise A chair with a mechanism is to be provided.

  The present invention presents the following means for solving the above problems.

[1] It has a seat frame and a back frame that are connected so that the relative angle can be freely changed, and a coil spring of a predetermined length is provided in the lower part of the back frame so that the upper part of the back frame can be elastically tilted. In the chair configured in
The coil spring is composed of a closing spring portion in which the middle portion in the length direction is in close contact with the unit coil portion, and both end portions are composed of open spring portions in which the unit coil portions are separated from each other,
A reclining mechanism characterized in that both ends of the coil spring are welded and fixed to corresponding portions of the back frame in a state where the connection end of the back frame is loosely inserted in the opening spring portion so as to be relatively slidable. A chair provided.

  [2] Both the seat frame and the back frame are made of a pipe frame formed by bending a metal pipe in a substantially U-shape, and these two frames are opposed to each other via a ratchet gear whose angle can be changed in multiple stages. A chair provided with the reclining mechanism according to the preceding item [1] which is connected to be freely changeable in angle.

  [3] A chair provided with the reclining mechanism according to [1] or [2] above, wherein the chair is configured as a seated chair.

  [4] The coil spring has a total length of 110 to 130 mm, an intermediate closing spring occupies a length of 40 to 60% of the total length, and open springs at both end portions respectively correspond to the total length. A chair provided with the reclining mechanism according to any one of [1] to [3] above, which occupies a length of 20 to 30%.

  [5] The reclining according to any one of [1] to [4], wherein the opening spring portion of the coil spring is provided with an interval of 2.0 to 3.0 mm between the unit coil portions. A chair with a mechanism.

  [6] A chair provided with the reclining mechanism according to any one of [1] to [5], wherein the coil spring is made of a spring steel wire having a wire diameter of 7.0 to 9.0 mm.

  According to this device, since the elastic reclining function of the backrest portion is realized by providing the coil spring in the lower portion of the back frame, it is structurally simple, easy to manufacture and cost-effective. In addition to being advantageous, when the user places his / her weight on the backrest, the elastic deformation in the length direction of the coil spring is smoothly performed, so that the feeling of use can be improved. More specifically, when a load is applied to the upper part of the back frame by applying a weight to the backrest of the user, the coil spring is a closing spring portion in the middle in the length direction. The rear surface side becomes a substantial fulcrum portion and starts bending deformation. This bending deformation is caused by the fact that the opening springs at both ends show a slight compression behavior on the rear side, and at the same time the intermediate closing springs and the opening springs at both ends show a slight extension behavior on the front side. Done. For this reason, the said bending deformation is performed smoothly.

  In addition, as described above, the opening spring portions at both ends are shortened on the rear surface side and extended on the front surface side when the vehicle is tilted backward, so that it occurs between the connection end portions of the back frame fitted in the opening spring portion. The relative friction can be extremely small in terms of distance and pressure. Therefore, it is possible to provide a chair having an easy-to-use elastic reclining function that does not generate an unpleasant metal-to-metal rusting sound caused by strong friction between them, or can be reduced to an almost negligible level.

  In addition, the rear frame tilt angle can be easily adjusted to any set angle by connecting the seat frame and the back frame via a ratchet gear that can change the angle in multiple stages. In addition, since the elastic reclining function can also be possessed, it is often practically convenient and much more comfortable to use.

  In addition, by applying this device to a seat chair, a seat chair with higher added value can be provided that has superior performance compared to the conventional products in the above points.

  In addition, by setting the length of the coil spring to 110 to 130 mm, the length of the closing spring portion to 40 to 60% of the total length, and the opening spring portion to 20 to 30% of the total length, the above-described effects can be ensured and good. It can be done in a way.

  Furthermore, by setting the opening interval of the opening spring part to 2.0 to 3.0 mm and the wire diameter of the coil spring to 7.0 to 9.0 mm, the back frame has a suitable range of elasticity. An elastic reclining function can be provided.

  Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is an overall inclination view of a frame structure when the present invention is applied to a seat, FIG. 2 is a side view of the same, and FIG. 3 is a perspective view of an elastic reclining mechanism provided with a coil spring.

  The seat frame structure (1) has a seat frame (2) and a back frame (3). Both of these frames (2) and (3) are made of a pipe frame formed by bending a metal pipe such as a steel pipe into a U-shape, and both ends of the main frame portion (2a) of the seat frame (2). That is, the back frame (3) is connected to the rear end via the joint bracket (4) so that the relative angle can be changed.

  The seat frame (2) includes the main frame portion (2a), an auxiliary auxiliary frame portion (2b) attached to the rear end of the main frame portion (2a) by extension, and, if necessary, the main frame portion (2a). It is comprised with the reinforcing rod (2c) attached suitably across both sides.

  The joint bracket (4) is a conventionally known one made of a ratchet gear, and is attached to a fixed first member (4a) connected and fixed to the seat frame (2) side and to the back frame (3) side. The second member (4b) on the rotating side is pivotally attached to the first member (4a) via the pivot shaft (5) and can be fixed at a predetermined variable angle via a built-in ratchet gear mechanism. ). The angle adjustment range can be variably adjusted to an arbitrary angle within a range of several steps to a few dozen steps within a rotation angle range from the position where the back frame (3) rises substantially vertically to the horizontal inverted position. It was made like that.

  The back frame (3) is configured such that one coil spring (6) is provided in an interposed state at the lower part of the right and left support columns. More specifically, the back frame (3) is composed of an upper U-shaped pipe main frame (3a), a short tubular base (3b) at the lower end, and a coil attached between them. It consists of a spring (6).

  As shown in detail in FIG. 3, the coil spring (6) has a tightening spring portion, that is, a closing spring portion (6 a), in which the unit coil portions are in close contact with each other adjacent to each other in the middle portion in the length direction. And it has what has the open spring part (6b) (6c) which spaced apart with the predetermined interval between what adjoins the both ends of the unit coil part.

  The fact that the coil spring (6) has the closing spring portion (6a) and the opening spring portions (6b) (6c) as described above is a very important first element in the implementation of the present invention.

  Thus, with respect to the opening spring portion (6b) at the upper end portion of the coil spring (6), the lower end portions of both side support portions of the main frame portion (3a) of the back frame (3) On the other hand, the short tubular base portion (3b) of the back frame (3) is inserted into the inner side of the opening spring portion (6c) at the lower end portion as a connection end portion. ing. Moreover, these connection end portions are loosely slidable relative to the above-described opening spring portions (3b) and (3c), but are not fitted with any gaps or fitted in a fitting state. .

  As described above, the connection end portion of the seat frame (3) is fitted into the length region portions of the open spring portions (6b) and (6c) at both ends of the coil spring (6), and is closed. The inside of the spring portion (6a) is left as a space portion (8) (see FIG. 4). This is also an important second factor in the practice of the present invention.

  The coil spring (6) has both ends, that is, the upper end of the opening spring portion (6b) and the lower end of the opening spring portion (6c), respectively, the outer peripheral surface of the upper main frame (3a) and the short tubular shape. It is firmly bonded and fixed to the outer peripheral surface of the base (3b) by means of welding (7). Accordingly, the upper and lower opening spring portions (6b) and (6c) are both capable of extending and contracting on the outer peripheral surface of the pipe connection end portion fitted therein. This is also a third important factor in the implementation of this invention.

  Incidentally, (3c) is a reinforcing bar for the back frame (3).

  In the application of the present invention as a seat chair, the coil spring (6) has a total length of 110 to 130 mm, preferably in the range of about 115 to 125 mm. If this is too long, exceeding 130mm, the disadvantage of increasing the cost will increase. Conversely, if using too short, less than 110mm, the frame strength will be maintained and a smooth elastic reclining function will be retained. It is easy to cause trouble.

  Further, in the use of the coil spring (6) having the above length, the intermediate closing spring portion (6a) has a length of 40 to 60% of the entire length, and the open spring portions (6b) and (6c) at both ends are the same. It is preferable to occupy a length of 20 to 30% of the entire length from the viewpoint of realizing a good elastic reclining action. Most desirably, the open spring portions (6b) and (6c) at both ends are set to about 25% of the total length, and the remaining about 50% is set to the closing spring portion (6a) of the intermediate portion.

  Moreover, as another structure of the coil spring (6) for achieving the effect of this invention satisfactorily, a spring steel wire having a wire diameter of 7.0 to 9.0 mm, preferably 7.5 to 8.5 mm is used. The open spring portions (6b) and (6c) are preferably provided with a space of 2.0 to 3.0 mm between the unit coil portions.

  In the above, the frame structure of the chair of the illustrated embodiment is configured as a seat chair by covering and mounting cushion bodies (not shown) on the seat frame (2) and the back frame (3). .

  Therefore, after the back frame (3) is adjusted and set to a predetermined angle, when the user places weight on the backrest while sitting on the seat, a load in the backward tilt direction is applied to the back frame (3). The For this reason, the main part (3a) of the upper part of the back frame (3) is elastically tilted backward with the elastic bending deformation of the coil spring (6), and the user can use it in an easy posture. .

Here, the elastic bending deformation of the coil spring (6) is realized by the expansion / contraction operation of each part of the coil spring (6) as shown in FIG. 4 (B) from the state shown in FIG. 4 (A). That is, when a backward tilt load is applied, the closing spring portion (6a) at the intermediate portion in the longitudinal direction of the coil spring (6) cannot be further contracted over the entire circumference, and therefore the closing spring portion (6a) ) A compressive force acts on the rear surface side, and this portion acts like a rotation fulcrum. As a result, the rear surfaces of the upper and lower open spring portions (6b) and (6c) are slightly displaced in the compression direction on the internal fitting pipe portion. On the other hand, a tensile force acts on the front side of the coil spring (6) almost uniformly over the entire length. As a result, the front side of the closing spring portion (6a) opens, that is, displaces in the extending direction, and at the same time, the opening spring portions (6b) and (6c) also displace the front side in the extending direction. The elastic bending deformation is smoothly performed over the entire length of the spring without any local deformation, and as a result, the elastic reclining of the backrest is smoothly performed, and the upper and lower opening spring portions (6b ) (6c) The spring is moved and slid on the outer peripheral surface of the connecting end of the back claim (3) inserted in (6c) within a very short distance and without a large frictional force. Is called. As a result, the intense unpleasant frictional sound generated when the spring (6) and the connecting end portion rub against each other strongly does not occur.

  This function and effect can be understood as more obvious by comparison with the elastic reclining mechanism equivalent to the prior art shown in FIG.

  That is, the conventional elastic reclining mechanism shown in FIG. 5 is configured such that the reclining coil spring (16) is a closing coil spring that is called a closed helical spring over its entire length. .

  When such a coil spring (16) is used, when a backward tilting load is applied to the back frame (3) as shown in FIGS. 5 (A) and 5 (B), the entire length of the coil spring (16) is increased thereafter. Since the surface side portion has no further shrinkage allowance, only the front side portion of the coil spring (16) tends to move greatly in the extending direction, that is, the opening direction.

  This movement on the front side of the spring appears as a sliding movement on the outer peripheral surface of the connection end of the back frame (3) inserted into the upper and lower ends, but the movement distance is the amount that the rear side is constrained. In addition to the large movement distance, the coil spring moves with respect to the connection end portion while expressing a large frictional force. For this reason, along with the bending deformation of the coil spring, a very unpleasant frictional sound is generated between the spring (16) and the connecting end of the back frame (3) due to strong friction between metals.

  In the present invention, such a defect can be remarkably merited in that it can be completely eliminated by a slight improvement of the coil spring.

It is a perspective view of the frame structure of the chair which shows preferable embodiment of this invention. It is a side view of the frame structure of a chair. It is a perspective view of the elastic reclining mechanism part similarly. FIG. 4 (A) shows the operating state of the elastic reclining mechanism of the chair according to the present invention, FIG. 4 (A) is a sectional view showing the state when the coil spring is stationary and FIG. It is. FIG. 5A and FIG. 5B are sectional views in the state corresponding to FIG. 4A and FIG. 4B, respectively, showing the operating state of the elastic reclining mechanism according to the prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Chair frame structure 2 ... Seat part frame 3 ... Back part frame 3a ... Main frame 3b ... Pipe base frame 4 ... Joint metal fitting 5 ... Axis 6 ... Coil Spring 6a ··· Clamping spring portion 6b · · Opening spring portion 6c · · Opening spring portion 7 ··· welded portion

Claims (6)

It has a seat frame and a back frame that are connected so that the relative angle can be changed, and a coil spring of a predetermined length is provided in the lower part of the back frame so that the upper part of the back frame can be elastically tilted. In the chair
The coil spring is composed of a closing spring portion in which the middle portion in the length direction is in close contact with the unit coil portion, and both end portions are composed of open spring portions in which the unit coil portions are separated from each other,
A reclining mechanism characterized in that both ends of the coil spring are welded and fixed to corresponding portions of the back frame in a state where the connection end of the back frame is loosely inserted in the opening spring portion so as to be relatively slidable. A chair provided.   Both the seat frame and the back frame are made of a pipe frame made of a metal pipe bent in a substantially U-shape, and these frames can be changed in relative angle via a ratchet gear that can change the angle in multiple stages. The chair provided with the reclining mechanism of Claim 1 connected with.   The chair provided with the reclining mechanism according to claim 1 or 2, wherein the chair is configured as a seat chair.   The coil spring has a total length of 110 to 130 mm, an intermediate closing spring occupies 40 to 60% of the total length, and open springs at both ends each have a length of 20 to 30 with respect to the total length. %. The chair provided with the reclining mechanism of any one of Claims 1-3 used as what occupies% length.   The chair provided with the reclining mechanism according to any one of claims 1 to 4, wherein the opening spring portion of the coil spring is provided with an interval of 2.0 to 3.0 mm between the unit coil portions. The chair provided with the reclining mechanism according to any one of claims 1 to 5, wherein the coil spring is made of a spring steel wire having a wire diameter of 7.0 to 9.0 mm.

Images