TWI546038B - Device for synchronizing the seat and backrest of a chair - Google Patents

Description

Device for synchronizing the seat and backrest of the seat

The present invention relates to a device for synchronizing the tilt angle of a seat or a back frame of a seat or any other seat mechanism, the synchronization action being relative to the corresponding base, that is, clearly Corresponding to the mutual inclination angle of the frame and the back frame, and used to determine the angle of inclination as a result of the user's weight and the type of backrest of the user leaning against the back of the seat during exercise.

In the prior art, such a synchronizing device is conventional, in which two first cranks that are parallel to each other and two second cranks that are parallel to each other are respectively at the front and rear portions of the mount, The frame is connected to the seat base, so that two four-links are formed in combination with the same frame, and each of the four links is disposed on one side of the seat. Such a synchronizing device is preferably acted upon by a lever having a fulcrum on the base of the seat itself to provide a mount that is constrained by the four links in terms of motion.

It should be noted that the following is a reference to such a four-link synchronization device, which is composed of two cranks hinged to the seat base, and the two cranks are respectively seated The front and rear portions of the rack are connected to the mount. Theoretically, a four-bar linkage of this kind can be used, and since the manner is adopted in this manner, the description can be simplified.

For example, the French patent FR 2045120 in the name of DUPART discloses such a synchronizing device for tilting the frame and the seat back frame by means of a four-bar linkage, the four-link having only two hinges a crank connected between the seat base and the frame, and a lever with a two-armed member having a fulcrum on the same base, and one of the arms is integrated into the seat back frame The other arm member is actuated on the rear portion of the frame for raising or lowering the frame according to the angle and the inclination of the seat back.

However, although the mechanical actuation of such a solution is relatively easy, the user will experience considerable force on the back of the chair in the opposite direction to the weight of the seat itself. The result of the mentioned lever size with the two-armed component has to be reduced.

In addition, due to the geometric relationship of the device described, the DUPART patent does not change the back of the chair in such a manner that the elevation or pull-down of the front portion of the seat is greater than the elevation or pull-down of the portion behind the seat. At the same time, the front and rear parts are raised or pulled down at the same time.

German Patent Application DE 3735256, in the name of NIKOV, describes a synchronization device for the angle of inclination of the seat back and the seat, wherein the four links comprise two cranks, one with the front and the other with the crank, the two cranks It is hingedly connected between the seat frame of the seat and the base of the seat, and wherein the seat frame is integrated into the crank of the four-bar linkage.

The front crank and the rear crank are inclined in different directions with respect to the vertical direction, that is, if the front crank is tilted at a sharp angle in a counterclockwise direction with respect to the vertical direction, then the rear crank is opposite to In the clockwise direction of the vertical direction, it is tilted at a sharp angle, and/or vice versa.

This solution, which is not well understood by all users, changes when the angle of inclination of the seat back is changed, in which the front part of the seat is raised and the rear part of the seat is simultaneously pulled down, or vice versa.

In addition, since the weight applied to the seat and the lever arm does not occur for too long, the problem of difficulty in tilting the seat back does not seem to be solved by the NIKOV device.

An international patent application WO 2008/067947 in the name of the SATO office discloses a device for synchronizing the tilt angles of the seat frame and the back frame of the seat, comprising four links, wherein the two cranks are hinged to The seat base arrives at the front and rear portions of the frame, respectively, and the lever with the two-armed member, which has a fulcrum on the end extension of the rear crank. By the action of the slider, one of the arm members of the two arm members is restrained by the front portion of the frame, and thus another arm member is integrated into the back frame.

Similarly, the seat back rotation provided by the SATO office solution resulted in the front part of the seat being raised and the same part of the seat being pulled down at the same time, but the resulting effect was not confirmed by the user. .

In addition, a slider consisting of a pin sliding in the extended aperture is used, and the slider is limited between the above-mentioned lever and the mount. This result will result in a comparison with the SATO office device. High work and assembly accuracy requirements.

Accordingly, it is an object of the present invention to disclose a device for synchronizing the tilt angle of a seat back with a seat or any other ride mechanism, and without the disadvantages of the prior art, which subsequently leads to a simplified mechanical construction and The user feels comfortable.

Another object of the present invention is to provide such a synchronization device for allowing a user to easily and effectively adjust the tilt angle of the seat back relative to its own weight, and subsequently adjust the tilt angle of the seat. The method is used to obtain a seat configuration that allows the user to have an optimal posture.

The above object and other objects can be attained by means of a device for synchronizing the inclination angle of the seat back and the seat in accordance with the first application of the independent patent application and the related related patent application.

According to the present invention, the apparatus for synchronizing the tilt angle of the seat back and the seat includes a back frame, a frame, and a bracket that is restrained by the base of the seat or that is coincident with the base of the seat. In conjunction with at least one first front crank hingedly coupled to the front portion of the bracket and the frame, and at least one second rear crank hingedly coupled to the bracket and the rear portion of the mount, the first crank and the second crank together form a seat The four links of the frame. The seat back frame provided by the apparatus of the present invention is preferably integrated with the first (front) crank described above.

In accordance with a preferred aspect of the present invention, the apparatus also includes an elastic mechanism for returning the mount toward the bracket, the resilient mechanism preferably being comprised of at least one spring (e.g., a cylindrical coil spring). Then, it is disposed between the pin of the second (rear) crank disposed on the mount and the front portion of the seat bracket.

According to another preferred aspect of the present invention, although the first (front) crank and the second (rear) crank of the apparatus are tilted in the same manner with respect to the vertical direction, the two cranks are opposite to the vertical direction. Individually different arc angles are different from each other.

As a result of the actual verification of this patent applicant, the extremely simplified construction of such a device allows the user to conveniently and effectively adjust the tilt angle of the seat back and the seat for an extremely comfortable posture desired by the user. .

Moreover, in its preferred embodiment, the geometry of the device obtained herein is such as to permit simultaneous elevation or lowering of the front and rear portions of the mount, as is apparent to those skilled in the art, In the vertical direction, the elevation or pull-down action of the front part of the frame may be greater than the raising or lowering action of the corresponding rear part of the frame.

In general, with reference to the drawings, in accordance with a preferred aspect of the present invention, apparatus 1 for synchronizing the angle of inclination of a seat back and a seat is shown herein, and in accordance with a preferred aspect of the present invention, includes a seat Rack 2 (the seat seat is connected to it in a conventional manner), back frame 13 (the seat back is connected thereto), and bracket 5 bounded by the seat base 14, for example by the same base The pins that are integrated together are tightened into the sleeve 12 of the bracket 5, which has the sleeve 12.

The synchronizing device 1 also includes at least one first front crank 3 and at least one second rear crank 4, which connect the mount 2 to the bracket 5 for forming a four-link 2 together with the mount 2. 3, 4.

In the preferred embodiment described herein, it is described in detail that the front crank 3 is hingedly connected to the bracket 5 and the front portion 2f of the frame 2 by means of the pins 6 and 7, respectively, and the rear crank 4 Then, by means of the pins 8 and 9, the hinges are respectively connected to the bracket 5 and the portion 2r after the same frame 2.

As can be seen in particular in Fig. 3, the synchronizing device according to the invention is here shown to be advantageous in that it has a back frame 13 integrated with the cranks 3 before the four links 2, 3, 4. Referring to Figures 1 and 2, the back frame 13 is specifically made to be integrated with the rear portion 3r of the front crank 3.

In this way, as is actually known, the longest lever arm of the back frame 13 and the crank 3 before being transmitted to the device due to the force acting on the back of the seat, when the user leans against his own weight When seated, usually the lower load is actuated to the front crank 3, and the result is easily adjusted by the user to effectively adjust the tilt angle of the seat back and the subsequent tilt angle of the seat. The configuration of the seat is obtained to allow the user to get a comfortable posture according to their own weight.

It should be understood that although only one of the four links 2, 3, 4 is shown and described herein, in accordance with a preferred embodiment of the present invention, the synchronization device 1 shown herein may comprise two identical four parallels. The two four-bar linkages are disposed at the two sides of the frame 2 such that in this application example, the back frame 13 can be integrated into the front crank of two mutually parallel four-links of the device. .

Referring again to the four links 2, 3, 4 described above, in accordance with a preferred aspect of the present invention, the rear portion 2r of the mount 2 and the bracket 5 are interconnected to the spring 10, which is used to block the same of the mount 2. The displacement of the rear portion 2r is from the bracket 5, and the displacement of the blocking is rotated in the counterclockwise direction from the starting position of the same mount 2 in the figure; at this starting position, the mount 2 is substantially Horizontal, and the back frame 13 is at its lowest tilt position opposite to the vertical direction.

In the embodiment of the invention shown here, the spring 10 is advantageously a cylindrical coil spring, is actuated at its end, and is constrained (by hinged connection) to the bracket 5 by the pin 11, respectively, and borrowed The pin 9 is restrained (joined by a hinge) to the rear portion 2r of the frame 2, and the rear crank 4 is sequentially restricted to the rear portion 2r of the frame 2.

It is observed that, for example and not for purposes of limitation, in the application of two four-links, the return springs 10 may be two or more and are disposed on the mount 2 and the bracket 5 between. Moreover, in other embodiments of the invention, the spring 10 is replaced by any other conventional resilient mechanism that can be used in the art.

According to a preferred aspect of the invention, the four links 2, 3, 4 may comprise fasteners for stopping the clockwise rotation and/or counterclockwise rotation of one crank or the other of the cranks 3, 4, the fastener being Constructed such that when the back frame rotation of the seat back 13 is oriented at a greater angle of inclination relative to the vertical, and then, the current crank 3 is rotated counterclockwise along the pin 6 in the figure, the mount 2 The synchronous raising operation of the front portion 2f and the rear portion 2r will occur. In this way, the elevation range of the front portion 2f in the vertical direction is greater than the synchronous elevation movement of the rear portion 2f.

Those skilled in the art will readily appreciate that the rotational action in the opposite direction of the back frame 13 (clockwise in the figure) will cause the portion 2r and the front portion 2f of the frame 2 to be pulled down simultaneously, thereby In this way, the pulling action of the front portion 2f of the frame 2 in the vertical direction will be greater than the synchronous lowering action of the rear portion 2r of the frame 2.

It will be apparent to those skilled in the art that such a technical utility is based on the fact that, although there are different angles from each other, the two cranks 3, 4 are often tilted in the same manner with respect to the vertical direction. So that the two cranks 3, 4 can be disposed at the same part with respect to the vertical axis, and when the back frame 13 is kept inclined at a crescent angle with respect to the same vertical direction, the user is prevented from being behind the frame 2 2r produces a feeling of discomfort that sinks.

In addition, in the embodiment shown here, the two cranks 3, 4 are not of excessively different lengths (this different length is considered to be the effective length of the crank 3 provided by the distance between the pins 6, 7) And the distance between the pins 9, 7 and between the pins 6, 8, followed by the angle at which the front crank 3 corresponds to the horizontal direction (counterclockwise in the figure) is an acute angle, By the angle (counterclockwise) of the rear crank 4 with respect to the horizontal direction, a more accommodating comfort will be transmitted to the device of the present invention.

It will further be appreciated that in embodiments of the invention not illustrated herein, the apparatus 1 further includes one or more additional mechanisms for blocking the angle of inclination of the back of the seat, the additional mechanism itself being Conventionally, in addition to the restriction stoppers previously mentioned for limiting the range of rotation of one and/or another crank 3, 4, in one or two rotation modes, when the mechanism is used by the user When actuated, this additional mechanism is used to prevent the back frame 13 and the frame 2 from being further rotated, and then the four links 2, 3, 4 are prevented from being further moved.

The device shown here operates as follows.

When the back frame 13 is not subjected to a load, that is, when the user is not sitting or leaning against the back of the seat, the actuating spring 10 maintains the frame 2 in its starting position, that is, substantially Level. Because of the mutual locking restriction between the same back frame 13 and the front crank 3, the substantially horizontal starting position of the frame 2 corresponds to the lowest inclined position with respect to the vertical direction of the back frame 13.

When the user sits down and leans against the back of the seat, the user will apply a force to the back frame 13, although the force is opposite to the direction of action of the spring 10, the force will cause the same back frame 13 produces a rotation along the pin 6 (counterclockwise in the figure), and due to a common limiting effect, the same front crank 3 will be constrained to the bracket 5 of the base 14.

Because of the limiting effect between the different components of the device 1 according to the invention, such a rotational action can also be reacted to the remaining components of the four links 2, 3, 4, in particular to cause the rear crank 4 to Its own pivot point 8 rotates to reach the bracket 5 (counterclockwise in the figure), and then the rotation of the mount 2 along the center of the swing will also change over time.

As previously mentioned, in accordance with a preferred aspect of the present invention, the particular shape of the four links 2, 3, 4 described herein will result in the simultaneous elevation of the rear portion 2r and the front portion 2f of the frame 2, During the above-described rotation, the raising operation of the rear portion 2r in the vertical direction is lower than the raising operation along the front portion 2f of the frame 2.

The effect of the rotation of the mount by the spring 10 for blocking the seat back 13 is to allow the user to confirm the preferred angle of inclination of the same back frame 13 that meets its own needs.

It should be understood that the special geometry of the four links 2, 3, 4 for restraining the bracket 5 (and the base 14 of the subsequent seat), the back frame 13 and the frame 2 from each other, together with the correct size of the spring 10 It will allow the user to obtain an extremely precise and effective adjustment of the tilt angle of the seat back, and can also be used to distribute the weight of the user.

Finally, when the user decides to reach the lowest angle of inclination of the seat back relative to the vertical direction, by reducing the load applied to the back frame 13, or when the user decides to stand up and leave the seat, the spring 10 is actuated The spring itself returns to its undeformed starting position (as can be seen in Figure 2), and this result will cause the cranks 3, 4 to rotate along the pins 6, 8 respectively (clockwise in the figure) , the frame 2 is returned to the starting position, and then the back frame 13 is returned.

1‧‧‧Synchronization device

2‧‧‧Seat/four-link

2f‧‧‧ front part

2r‧‧‧ rear part

3‧‧‧First front crank / four link

3r‧‧‧ rear part

4‧‧‧Second rear crank / four link

5‧‧‧ bracket

6‧‧ ‧ sales

7‧‧ ‧ sales

8‧‧‧ pin/pivot point

9‧‧‧ pin/location point

10‧‧‧Spring/elastic mechanism

11‧‧ ‧ sales

12‧‧‧ sleeve

13‧‧‧Backrest/seat back

14‧‧‧Base

For the purposes of illustration and not limitation, the preferred embodiments of the present invention will be described with reference to the drawings in which: FIG. 1 is a device for synthesizing the tilt angle of the seat back and the seat in accordance with the present invention. Part of the side view, which describes the back of the seat is Figure 2 is a partial side view of the device of Figure 1, wherein the seat back is configured at its lowest tilt position; Figure 3 is depicted in Figure 1 or Figure 2 The seat configuration of the device; and Figure 4 is a partial mechanical configuration of the device of Figures 1 and 2.

1‧‧‧Synchronization device

2‧‧‧Seat/four-link

2f‧‧‧ front part

2r‧‧‧ rear part

3‧‧‧First front crank / four link

3r‧‧‧ rear part

4‧‧‧Second rear crank / four link

5‧‧‧ bracket

6‧‧ ‧ sales

7‧‧ ‧ sales

8‧‧‧ pin/pivot point

9‧‧‧ pin/location point

10‧‧‧Spring/elastic mechanism

11‧‧ ‧ sales

12‧‧‧ sleeve

Claims (8)

A device (1) for synchronizing a tilt angle of a seat back and a seat, the device comprising a back frame (13), a frame (2) and being restrained or seated by a seat base (14) a bracket (5) of the base of the chair (14), together with at least one first crank that is hinged to the bracket (5) and the front portion (2f) of the bracket (2) with pins (6, 7) (3), and at least one second crank (4) having a pin (8, 9) to be hinged to the bracket (5) and a portion (2r) of the bracket (2), the at least one first The crank (3) and the second crank (4) can together with the mount (2) form a four-bar linkage, the device (1) being characterized in that the back frame (13) is integrated to the at least one first crank (3) ). The device of claim 1 is characterized in that it comprises an elastic mechanism (10) for returning the frame (2) toward the support (5). The device of claim 2, wherein the elastic mechanism (10) comprises at least one spring, the at least one spring being disposed between the frame (2) and the bracket (5) to function. A device according to claim 3, characterized in that the at least one spring (10) is restrained by the pin (11) to the bracket (5) and restrained to a position point (9), wherein the at least one second crank ( 4) It is rotated to the mount (2). A device according to claim 1, characterized in that the at least first crank (3) and the at least one second crank (4) are kept inclined in the same manner with respect to the vertical direction. The device of any one of claims 1 to 5, wherein the at least first crank (3) and the at least one second crank (4) are opposite Keep tilting at different angles in the vertical direction. The device of claim 1, wherein the four links (2, 3, 4) are configured to allow the front portion (2f) and the rear portion (2r) of the mount (2) Can be raised or pulled down simultaneously. The device of claim 7 is characterized in that, in the vertical direction, the raising or lowering action of the front portion (2f) of the frame (2) is greater than the rear portion of the frame (2) ( 2r) Raise or pull down.