KR101505492B1 - Backrest positioning apparatus for a chair - Google Patents

Abstract

The present invention relates to an apparatus for adjusting the fixed mounting position of a backrest on a rear support frame for supporting a backrest of a chair from the rear, A longitudinal vertical support frame formed as a frame including a section in which two rows of frame rails extend in parallel; An uneven rail groove formed on the opposite surfaces of the two rows of frame rails constituting the vertical support frame; A first concave-convex slider and a second concave-convex slider each having a concave-convex surface having a length mutually engaged with a section of the concave-convex surface of the concave-convex rail groove; An elastic spring installed between the first concave-convex slider and the second concave-convex slider so that both ends of the first concave-convex slider and the second concave-convex slider are supported on opposite opposite sides; And a horizontal horizontal support frame that moves along the vertical support frame while being connected and fixed to the seat back with the first and second concave-convex sliders and the second concave-convex slider being provided with the elastic spring therebetween, The position adjusting device of the present invention.

Description

[0001] BACKREST POSITIONING APPARATUS FOR A CHAIR [0002] BACKGROUND OF THE INVENTION [0003]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a position adjusting device for a chair back, and more particularly, to a position adjusting device for a chair back which is capable of easily adjusting a position of a backrest, And more particularly, to a chair backrest position adjusting apparatus capable of preventing the position thereof from varying even if an impact is applied to the backrest.

In addition, when the chair is used for a chair having two back plates spaced laterally apart from each other as a chair back, it is possible to adjust the height of the backrest, and furthermore, To a regulating device.

Generally, the chair is designed to be most suitable for the human body so that the human being can sit comfortably in the most comfortable posture. Among them, the chair back is made of various kinds of bends Is provided.

Such a chair backrest is mainly composed of a fixed type in which the backrest is fixed to a chair frame or a seat plate and a backrest type in which the backrest can be turned back and forth within an appropriate angle range so that the angle of the chair backrest can be adjusted in a desired state An angle adjustable type is provided.

However, since most of such chairs are not adjustable in height according to the height of the user, their use range is limited. To solve this problem, a chair capable of adjusting the height of the backrest is provided. However, A general backrest height adjustment structure is disclosed in Korean Registered Utility Model No. 20-0323355 (2003. 08. 14. Announcement), in which a horizontal frame horizontally supporting the backrest (back plate) And the height of the inside of the fastening hole through which the fastening bolt is fixed is changed to fix the height of the backrest by fixing the fastening bolt with the fastening bolt by using the fastening bolt and the fastening nut. As a general and different structure, Korean Registered Utility Model No. 20-20-0189719 (2000. 07. 15. Announcement), the horizontal frame is separated into a front portion and a rear portion, and a vertical frame is inserted and fixed in a gap between the frames so that the position of the backrest can be adjusted and fixed depending on the friction fixing force Structure has been proposed.

However, in the case of using a chair having such a position adjusting structure, releasing the fastening bolts for performing the substantially orthodontic fixing action tends to cause the chair back and the horizontal frame connected thereto to fall freely by gravity, The adjustment of the height of the locking bolt is difficult and the position of the locking bolt is relaxed when the continuous impact is applied to the back by the user's back even after the height adjustment of the backrest of the chair is completed. I have a problem that can be.

On the other hand, in the case of a chair with two backrests spaced apart in the lateral direction, the backrests being laterally spaced are located on the left and right sides of the user's spine, And two back plates that serve to support each of them. These two back plates are usually provided in a horizontal back plate support (horizontal frame). Since the body conditions are different for each person, a back plate (back plate) capable of adjusting the degree of spread between two back plates It is no wonder that there are technical requests for supporting devices.

[0004] On the other hand, a chair backboard support apparatus having two backboards arranged laterally spaced apart from each other according to the prior art structure adapted to meet such a technical requirement includes a backboard support, a first elongated hole formed in a seat of the backplate support, A first fastening bolt inserted into the first long hole and fastened to the first back plate and a second fastening bolt inserted into the second long hole and fastened to the second back plate; . Therefore, the position of the second back plate can be adjusted while the first bolt is loosened to adjust the position of the first back plate while sliding the first bolt left or right along the first long hole, and sliding the second bolt left or right along the second long hole .

However, since the conventional chair backing plate supporting apparatus having two back plates spaced laterally apart can move the first and second fastening bolts freely and laterally in the first and second slots, So that the back plate can be slid to the left and right while fastening the fastening bolt while holding the back plate. Therefore, the following problems may occur.

The amount of lateral movement of the first and second back plates, i.e., the distance between the first and second back plates, must be measured only by the user's eyes, so that it is difficult to accurately grasp the left and right symmetry of the first back plate and the second back plate .

 Even if the positions of the first and second back plates are precisely adjusted to the desired positions, external forces acting in the direction of moving the back plate to the left and right due to pressure, impact, etc., , When the external force exceeds the frictional resistance between the fastening end of the backing plate fastened to the fastening bolt and the backing plate support (even if the structure increases the frictional resistance), the backing plate may slide slightly to the left and right. Further, The fastening force of the fastening bolts is weakened and the positions of the first and second back plates can be varied.

In addition, if the position of the first and second back plates is improperly adjusted or the position thereof is varied by an impact or the like, if the user sits in the chair for a long time in such a state, the spine may be inflicted, .

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems and it is an object of the present invention to provide a rear support frame supporting the back of a chair, The position of the seat back can be prevented from varying even if a continuous impact is applied to the backrest.

Another object of the present invention is to provide a seat back which comprises a first back plate and a second back plate spaced laterally apart from each other, While the position of the first back plate and the second back plate can be adjusted while maintaining the symmetry so that the positions of the first back plate and the second back plate are spaced apart from each other by the same distance from the center of the backrest, And the position of the chair can be prevented from varying even if it is applied to the chair.

In order to achieve the above object, according to the present invention,

An apparatus for adjusting the fixed mounting position of a backrest on a rear support frame for supporting a backrest of a chair from behind,

A longitudinal vertical support frame extending in a rearward upward direction from a seat plate of the chair and including a section in which two rows of frame rails are extended in parallel, the longitudinal vertical frame supporting a seat back provided at a front side;

An uneven rail groove formed on the opposite surfaces of the two rows of frame rails constituting the vertical support frame;

A first concave-convex slider and a second concave-convex slider each having a concave-convex surface having a length mutually engaged with a section of the concave-convex surface of the concave-convex rail groove;

An elastic spring provided between the first concavo-convex slider and the second concavo-convex slider so that both ends of the first concavo-convex slider and the second concavo-convex slider are supported on opposite sides of the second concavo-convex slider, An elastic spring capable of being elastically deformed so that a protrusion provided on an uneven surface of the uneven slider comes out of the recessed portion of the uneven rail groove and is able to move up and down without interference with the protruding portion of the uneven rail groove; And

And a horizontal horizontal support frame which moves longitudinally along the vertical vertical support frame while being connected to the first back and forth slider, the second concave and convex slider, and the elastic spring between the first and second concave and convex sliders, And a height adjusting device for adjusting the height of the backrest.

A rotary knob for pressing the first concave-convex slider and the second concave-convex slider so as to be fixed on a rear base guide plate disposed behind the horizontal support frame; Further, it is preferable that a locking bolt is further provided, which is fastened to the lock nut formed through the rotation knob and inserted in the horizontal support frame, and the rotary knob is tightly fixed on the rear base guide plate.

According to the present invention, in the case of a chair having two back panels spaced laterally apart from each other, the back panel height adjusting device described above is additionally provided with a back panel adjusting and supporting device provided in a horizontal horizontal supporting frame However,

A coupling end is formed so as to be coupled with the coupling ends of the coupling means of the first and second back plate symmetrically provided on the left and right sides of the seat back and the coupling bolt respectively so that the coupling ends can be slid transversely in the horizontal support frame A left and right fastening slider bar to be disposed;

A back plate spacing adjuster disposed between the right and left fastening slider bars to provide opposite lateral transverse displacements of the same size in each of the left and right fastening slider bars; And

Wherein the first and second backing sliders are disposed between the right and left fastening slider bars and the first and second back plates so as to guide the lateral sliding movement of the left and right fastening slider bars and the lateral sliding movement of the first and second back plates respectively fixed thereto, A back plate spacing adjusting device comprising a front base guide plate forming a front face of the support frame is provided in a horizontal horizontal support frame,

The rotation knob used in the above-described chair back height adjusting device may be provided to rotate the back plate spacing adjusting member in a state of being engaged with the back plate spacing adjusting member,

The locking bolt used in the above-described chair back height adjusting device may be provided to fix the backlash gauge and the rotation knob to switch the operable state of the backlash gauge to the locked state.

The above-described position adjusting device of the chair back according to the present invention can have the following effects.

According to the basic constitution of the present invention, as the apparatus provided in the horizontal support frame for supporting the chair back, the interval between the first concave-convex slider and the second concave-convex slider elastically supported by the elastic spring is changed, The engaging state or the releasing state between the uneven surface formed in the concave and convex rail groove of the two frame rails constituting the frame rail and the uneven surface of the first concave-convex slider and the second concave-convex slider can be changed, The height of the horizontal support frame supporting the backrest of the chair on the vertical support frame, that is, the height of the backrest can be easily adjusted.

Further, as described above, in the horizontal support frame which can be adjusted in the height of the backrest while being moved in the longitudinal direction along the vertical support frame, the left and right tightening slider bars are disposed so as to be further slidable in the lateral direction, And the first and second back panels are provided at positions which are equally spaced from the center of the backrest of the chair by providing the back panel spacing adjusting openings for providing opposite lateral moving displacements of the same size to the left and right fastening slider bars, And the front base guide plate is provided to guide the lateral sliding movement of the first and second back plates when the position of the back plate is moved, thereby making it possible to perform a more stable and easy back plate spacing adjustment operation Lt; / RTI >

Further, the first concave-convex slider and the second concave-convex slider constituting the apparatus for providing the rotation of the back-up space adjusting member of the back-up space adjusting device and also providing the function of adjusting the height of the backrest are disposed on the rear base guide plate The position of the first and second back plates (height and lateral spacing) can be changed by an external pressure, impact, or the like, by changing the rotation knob and the locking bolt for fixing the rotary knob. Can be prevented. Ultimately, scoliosis can be prevented in advance, which can result from incorrect positioning and repositioning of the backing position.

FIG. 1 is a rear perspective view showing a state in which an apparatus for adjusting the height of a chair back is installed according to an embodiment of the present invention.
FIG. 2 is a rear perspective view of the embodiment shown in FIG.
3 is an operational state diagram illustrating a process of shifting the horizontal support frame along a rear vertical frame to a state capable of sliding movement in a state in which the vertical sliding movement is locked.
4 is a perspective view of the first and second concave-convex sliders and the second concave-convex slider so that the protrusions provided on the concave-convex surfaces of the first concave-convex slider and the second concave-convex slider are inserted into the concave- (For example, a state in which the compression type elastic spring is uncompressed).
Fig. 5 is a side view showing a state in which the projections provided on the uneven surface of the first concave-convex slider and the second concave-convex slider come out of the concave-convex rail groove of the vertical support frame, (For example, a state in which a compression type elastic spring is compressed).
6 is an exploded perspective view and a front view of an operating state in a state in which a device capable of adjusting the distance between two backing plates spaced apart in the lateral direction according to a further embodiment of the present invention is installed.
7 is an operating state back view and an enlarged view of the back plate spacing adjusting and supporting apparatus shown in Fig.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

FIG. 1 shows a state in which a device for adjusting the height of a backrest of a chair is installed according to an embodiment of the present invention. FIG. 2 is an enlarged view of the detailed structure of the embodiment shown in FIG. 3 illustrates a process of shifting the horizontal support frame along the rear vertical frame in a state in which the vertical support frame is slidably locked.

First, an apparatus for adjusting a fixed mounting position of a backrest on a rear support frame for supporting a backrest of a chair, which is shown as an embodiment of the backrest position adjusting apparatus of the present invention, will be described with reference to the drawings.

As shown in Figs. 1 to 5, a longitudinal frame extending rearward and upward from a left-hand board (not shown) of a chair and supporting a chair-back 20 installed at the front is provided with two rows of frame rails 11, 12) extending in parallel to each other are provided in advance.

2, 4, and 5, convexo-concave rail grooves 11a and 12a in which uneven surfaces are formed are formed on the opposing surfaces of the two rows of frame rails 11 and 12 constituting the vertical support frame The concave and convex rail grooves 11a and 12a are provided with recessed portions 11a1 and 12a1 and protruding portions 11a2 and 12a2. The recessed portions 11a1 and 12a1 of the recessed rail grooves 11a and 12a, It is preferable that the shapes of the projections 11a2 and 12a2 are formed in a trapezoidal shape, more preferably a trapezoidal shape in which the corners are rounded.

The horizontal support frame 30 moving along the vertical support frame 10 while being connected to and fixed to the chair back 20 is provided with a part of the irregular surface of the irregular rail grooves 11a and 12a A first concave-convex slider 41 and a second concave-convex slider 42 having concave-convex surfaces 41a and 42a of mutually engaged length formed on one side; And is provided between the first concave-convex slider 41 and the second concave-convex slider 42 so that both ends of the first concave-convex slider 41 and the second concave-convex slider 42 are opposed to each other As the elastic spring 43, protrusions 41a1 and 42a1 protruding from the first and second concave-convex sliders 41 and 42 of the second concave-convex slider 42 protrude from the concave-convex rail grooves 11a, Elastic springs 43 capable of being elastically deformed so as to be able to slide upward and downward without interfering with the protruding portions 11a2 and 12a2 of the concave and convex rail grooves 11a and 12a by coming out from the concave portions 11a1 and 12a1 of the concave- And a seat backrest position adjusting device is provided.

The protrusions 41a1 and 42a1 provided on the uneven surfaces 41a and 42a of the first concave-convex slider 41 and the second concave-convex slider 42 and the recesses 41a1 and 42a1 between the protrusions 41a1 and 42a1, It is preferable that the shapes of the projections 41a2 and 42a2 are formed in a trapezoidal shape, more preferably a trapezoidal shape in which the corners are rounded.

The protrusions 41a1 and 42a1 provided on the uneven surfaces 41a and 42a of the first concave-convex slider 41 and the second concave-convex slider 42 are inserted into the concave and convex portions 11a and 12a of the concave- (For example, a compressive force (for example, a compressive force) is applied to the elastic spring 43 so that the elastic spring 43 can be brought into an unlocked state where it can be moved up and down without interference with the protruding portions 11a2, 12a2 of the protruded rail grooves 11a, It is preferable that the first uneven slider 41 and the second uneven slider 42 are provided with unlocking knobs 41b and 42b as shown in FIG. 2, , The use of the unlocking tabs 41b and 42b allows the first and second concave and convex sliders 41 and 42 to be gathered at the center while overcoming the elastic resistance of the elastic spring 43 .

On the other hand, when the first concave-convex slider 41 and the second concave-convex slider 42 are pressed to be positioned in a fixed state on the rear base guide plate 35 disposed behind the horizontal support frame 30 It is preferable to provide the knob 37 and the lock bolt 38. In this case, the protrusions provided on the uneven surfaces 41a and 42a of the first and second rugged sliders 41 and 42 The rotary knob 37 is moved in the direction in which the first concavo-convex slider 41 and the second concavo-convex slider 41a are in contact with each other so that the locking knobs 41a1, 42a1 can be kept locked in the concave and convex portions 11a1, 12a1 of the concave- 2 concave / convex slider 42 can be pressed so as to be fixed on the rear base guide plate 35 disposed on the rear side of the horizontal support frame 30, and this pressurized state is transmitted to the lock bolt 38 . That is, the lock bolt 38 is fastened and fixed to the lock nut 31c formed in the horizontal support frame 30 through the rotation knob 37 and the rotation knob 37 is engaged with the rear base guide plate 35, So as to be fixedly attached to the surface.

4, the first concave-convex slider 41 and the second concave-convex slider 42 are disposed at the rear side of the horizontal support frame 30, The protrusions 41a1 and 42a1 provided on the uneven surfaces 41a and 42a of the first concave-convex slider 41 and the second concave-convex slider 42 in a state of being fixed in a state of being fixed on the base guide plate 35 Are inserted and fixed in the recessed portions 11a1 and 12a1 of the section of the recessed rail grooves 11a and 12a extending parallel to the two rows of frame rails 11 and 12 constituting the vertical vertical support frame 10 in the longitudinal direction, The protruding portions 11a2 and 12a1 of the section of the concave and convex rail grooves 11a and 12a are kept locked in the concave and convex portions 41a2 and 42a1 of the first concave and convex slider 41 and the second concave and convex slider 42 Two back plates 2 (see Fig. 1) fixedly arranged in the front of the horizontal support frame 30 via a fastener 22, 1 can be set to a fixed position.

When it is necessary to change the height of the backrest 20, the locking bolt 38 is released from the locked state so that the first concave-convex slider 41 and the second concave-convex slider 42 are separated from the rear base guide plate 5 by using the unlocking knobs 41b, 42b shown in Fig. 2, the first and second concave-convex sliders 41, 42 Can be gathered at the central portion while narrowing the spacing on the rear base guide plate 35 disposed on the rear side of the horizontal support frame 30 so that the first concave-convex slider 41 and the second concave-convex slider The protruding portions 41a1 and 42a1 of the frame members 42 are removed from the recessed portions 11a1 and 12a1 of the section of the protruding rail grooves 11a and 12a extending parallel to the frame rails 11 and 12, The first concave-convex slider 41 and the second concave- The rider 42 is allowed to slide along the frame rails 11 and 12 so that the height of the horizontal support frame 30 and the chair back 20 can be adjusted and when the adjustment operation is completed, The force acting on the release tabs 41b and 42b is removed so that the elastic restoring force of the elastic spring 43 acts so that the first concave-convex slider 41 and the second concave-convex slider 42, (11, 12).

Further, as a further embodiment of the present invention, in the case of a chair having two back panels spaced laterally apart as a chair back, a back panel spacing adjusting and supporting device provided in a horizontal horizontal supporting frame may be additionally provided, This backing gap adjusting and supporting device has the configuration and operating state as exemplified by the exploded perspective view of FIG. 6, the operating state front view, the operating state back view of FIG. 7,

6 and 7, in order to adjust the distance between the two back plates 21 constituting the chair back 20, the back plate spacing adjusting and supporting device is arranged in the lateral direction And a horizontal support frame 30 having such a backlash adjusting and supporting device is fixedly mounted on the vertical vertical support frame 10. [

Fig. 6 is an exploded perspective view and an operation state front view showing an additional backlash adjusting device, and Fig. 7 is an operational state back view and an enlarged view of the backlash adjusting device.

1 to 7, the backrest spacing adjusting and supporting apparatus provided in the horizontal horizontal support frame of the chair having two back panels spaced laterally apart according to an embodiment of the present invention includes a chair back 20 , The backrest spacing adjusting and supporting device is used to adjust the spacing between the two backrests 21 of such a chair by means of horizontal horizontal support And a horizontal support frame 30 provided with the backing interval adjusting and supporting device is fixed to the vertical support frame 10 in the longitudinal direction.

Each of the two back plates 21 spaced apart from each other in the transverse direction is mounted on the back surface of the back plate 21 to be connected and fixed to the horizontal support frame 30 provided with the back plate spacing adjusting and supporting device, And an elastic binding port 22 and a binding end 22a.

6 and 7, the backrest spacing adjusting and supporting apparatus according to the preferred embodiment of the present invention includes first and second backing plates 21 symmetrically provided on the left and right portions of the backrest 20, The fastening end 33c is formed so as to be engaged by the fastening end 22a of the fastening hole 22 of the fastening bolt 22 and the fastening bolt 32, A fastening slider bar 33; A back plate spacing adjusting member (34) disposed between the left and right fastening slider bars (33) to provide opposite lateral transverse moving displacements of the same size to the left and right fastening slider bars (33); The left and right fastening slider bars 33 and the first and second fastening slider bars 33 are guided so as to guide the lateral sliding movement of the left and right fastening slider bars 33 and the lateral sliding movement of the first and second back plates 21 And a front base guide plate (31) disposed between the second back plate (21) and forming a front surface of the horizontal support frame (30).

Meanwhile, the rotation knob 37 used in the above-described chair back height adjusting device is provided to rotate the back plate spacing adjusting member 34 while being engaged with the back plate spacing adjusting member 34, The locking bolt 38 used in the seat back height adjusting device is moved in the vertical direction by the back plate spacing adjusting member 34 and the rotation knob 37 so as to switch the operable state of the back plate spacing adjusting member 34 to the locked state .

The pinion gear portion is provided on the outer peripheral portion of the back plate spacing adjusting portion 34 and the pinion gear portion is inserted into a latch key groove 37a formed at the center of the rotary knob 37 at an inner peripheral portion of the back plate spacing adjusting portion 34 So that the pinion gear can be rotated by the rotational force of the rotary knob 37. [0033] As shown in FIG. A lock nut 31c is inserted in a center portion of the front base guide plate 31 and a lock bolt 38 for fixing the back plate spacing adjusting hole 34 is formed in the center of the front base plate 31, The rotation knob 37 is pushed through the back plate spacing adjusting hole 34 and fixed to the lock nut 31c to prevent rotation of the rotation knob 37 and the back plate spacing adjusting portion 34 .

The left and right fastening slider bars 33 are provided with rack gear portions 33a and 33b which are engaged with the pinion gears of the outer peripheral portion of the back plate spacing adjusting portion 34 disposed at the center, Each of the rack gear portions 33a and 33b of the left and right fastening slider bars 33 arranged symmetrically so as to be engaged with the upper and lower ends of the pinion gear of the outer peripheral portion of the back plate spacing adjusting portion 34, The rack gear portions 33a and 33b engaged with the upper and lower ends of the pinion gear of the outer peripheral portion when the back plate spacing adjusting member 34 is rotated in one direction by the rotation of the rotary knob 37, Each of the right and left fastening slider bars 33 is slidably moved in the opposite lateral direction.

As described above, the horizontal support frame 30 is fixed to the vertical support frame 10 so as to secure the position where the front base guide plate 31 is fixed to the vertical support frame 10, The rear base guide plate 35 provided with the first concavo-convex slider 41 and the second concavo-convex slider 42 provided therebetween and the elastic spring 43 therebetween is provided, The rear base guide plate 35 is disposed in the inner space between the guide plate 31 and the rear base guide plate 35 so as to secure a fixed position of the center of the back 20, A locking slot 31b is formed at the center of the fixing slot 31b and the lock nut 31c is inserted into the center of the fixing slot 31b. In this case, sliding guide grooves 33d are formed on the opposite sides of the right and left fastening slider bars 33. In this case, the sliding guide grooves 33d are formed on both sides of the fixing slot 31b, So that the stable lateral sliding of the left and right fastening slider bars 33 can proceed while maintaining mutual meshing with the sliding guide protrusions 31d so that the first and second back plates 21, Thereby guiding the stable lateral sliding movement. In addition, while the left and right fastening slider bars 33 are slid in the lateral direction on the left and right sides of the front base guide plate 31, the fastening ends 33c of the right and left fastening slider bars 33, A transverse elongated hole 31a is provided so that the fastening bolt 32 connecting between the fastening ends 22a of the fastening holes 22 of the fastening base 21 can be laterally slidably moved, 35 are provided with a rotatable protective cover 39 so as to cover the rotation knob 37 and the lock bolt 38.

The front operating state diagram ('back plate' and 'front base guide plate') of the left and right fastening slider bars 33 seen from the back plate sliding movement state about the back plate spacing opening 34 is shown in FIG. (A) and (B) in the lower part of FIG. 6, and FIG. 7 shows the rear operation of the back plate of the back plate of FIG. 7 (A) and (B). 6 and 7 (A) show a state in which the interval between the first and second backing plates 21 is minimized, and FIG. 7 (B) shows a state in which the distance between the first and second backing plates 21 So that the interval is maximized.

The process of adjusting the distance between the two back plates 21 constituting the chair back 20 using the horizontal support frame 30 having the assembled back plate spacing adjusting and supporting device will be described. The cover 39 is opened to loosen the fastening state of the lock bolt 38 and then the rotation knob 37 is rotated to rotate the back plate spacing adjusting member 34 interlocked with the rotation knob 37, Side sliding movement of the right and left fastening slider bars 33 is performed, thereby adjusting the left and right sliding movements of the back plate 21 fixed to the front of the right and left fastening slider bars 33 and adjusting the back plate spacing. When the adjustment operation is completed, So that the position of the back plate 21 is not changed even if an external force is applied to the back plate 21 so that the back plate 21 is secured.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, Of the right.

10: vertical support frame 20: chair back
21: first and second back plate 22: fastener
30: Horizontal support frame
31: front base guide plate 32: fastening bolt
33: right and left fastening slider bar 34:
35: rear base guide plate 37: rotary knob
38: Lock bolt

Claims (12)

An apparatus for adjusting the fixed mounting position of a backrest on a rear support frame comprising a vertical support frame (10) and a horizontal support frame (30) provided to support a chair back from behind,
A longitudinal frame extending rearward upward from the seat plate of the chair and supporting the seat back 20 installed at the front thereof and including a section in which two rows of frame rails 11 and 12 are extended in parallel A vertical vertical support frame 10;
Irregular rail grooves (11a, 12a) in which uneven surfaces are formed on opposing surfaces of the two rows of frame rails (11, 12) constituting the vertical support frame;
A first concave-convex slider 41 and a second concave-convex slider 42 each having uneven surfaces 41a and 42a which are mutually engaged with a part of the uneven surface of the uneven rail grooves 11a and 12a;
(42) is provided between the first concave-convex slider (41) and the second concave-convex slider (42) so that both ends of the first concave-convex slider (41) A spring 43; And
The vertical support frame 10 is fixedly connected to the seat back 20 by being provided with the first concave-convex slider 41 and the second concave-convex slider 42 and the elastic spring 43 therebetween. And a horizontal support frame (30) moving in the horizontal direction. The method according to claim 1,
The resilient spring 43 has projections 41a1 and 42a1 projecting from the first and second concave-convex slider 41 and the second concavo-convex slider 42, 12a2 of the concavo-convex rail grooves 11a, 12a so as to be able to move up and down without interference with the protrusions 11a2, 12a2 of the concavo-convex rail grooves 11a, 12a Positioning device for backrest. 3. The method of claim 2,
The concave and convex portions 11a1 and 12a1 and the projections 11a2 and 12a2 provided in the concave and convex rail grooves 11a and 12a formed in the two frame rails 11 and 12 of the vertical support frame 10 have a trapezoidal shape , And
The protrusions 41a1 and 42a1 provided on the uneven surfaces 41a and 42a of the first concave-convex slider 41 and the second concave-convex slider 42 and the recessed portions 41a2 and 41a3 between the protrusions 41a1 and 42a1, 42a2) are shaped to have a trapezoidal shape. 3. The method of claim 2,
The protrusions 41a1 and 42a1 provided on the uneven surfaces 41a and 42a of the first concave-convex slider 41 and the second concave-convex slider 42 are inserted into the concave portions 11a1 and 12a1 of the concave and convex rail grooves 11a and 12a It is possible to easily apply an elastic deformation force required for the elastic spring 43 so as to be brought into an unlocked state in which it is possible to slide upward and downward without interfering with the protruding portions 11a2 and 12a2 of the concave and convex rail grooves 11a and 12a Wherein the first uneven slider (41) and the second uneven slider (42) are provided with unlocking knobs (41b, 42b). 3. The method of claim 2,
A rotary knob for pressing the first concave-convex slider 41 and the second concave-convex slider 42 to be fixed on a rear base guide plate 35 disposed behind the horizontal support frame 30 37); And
A lock bolt 31c inserted through the rotary knob 37 and inserted in the horizontal support frame 30 and fastened and fixed to the rear base guide plate 35, (38) is additionally provided to the seat back (20). 6. The method of claim 5,
The fastening bolts 32 are fastened to the fastening ends 22a of the fastening holes 22 of the first and second backing plates 21 symmetrically provided on the left and right sides of the chair back 20, A left and right fastening slider bar 33 formed to be slidable in the horizontal direction within the horizontal support frame 30;
A back plate spacing adjusting member (34) disposed between the left and right fastening slider bars (33) to provide opposite lateral transverse moving displacements of the same size to the left and right fastening slider bars (33);
The left and right fastening slider bars 33 and the first and second fastening slider bars 33 are guided so as to guide the lateral sliding movement of the left and right fastening slider bars 33 and the lateral sliding movement of the first and second back plates 21 And a front base guide plate (31) disposed between the second back plate (21) and forming a front surface of the horizontal support frame (30), and
The rotation knob 37 is provided to rotate the back plate spacing adjusting member 34 in a state of being engaged with the back plate spacing adjusting member 34. The locking bolt 38 is provided on the back plate spacing adjusting member 34, Is provided to fix the back plate spacing adjusting member (34) and the rotation knob (37) so as to switch the operable state of the backrest to a locked state. The method according to claim 6,
A pinion gear portion is provided on the outer peripheral portion of the back plate spacing adjusting portion 34 and a pinion gear portion is inserted into an inner circumferential portion of the back plate spacing adjusting portion 34 into a latch key groove 37a formed at the center of the rotary knob 37, And a latching key (34a) protruding from the pinion gear (34a) is formed to enable rotation of the pinion gear by the rotational force of the rotary knob (37). 8. The method of claim 7,
A lock nut 31c is insert-formed at the center of the front base guide plate 31,
The lock bolt 38 for fixing the back plate spacing adjusting member 34 is fixed to the lock nut 31c through the rotation knob 37 and the back plate spacing adjusting member 34 so that the rotation knob 37 So as to prevent rotation of the rotary knob (37) and the back plate spacing adjuster (34). 8. The method of claim 7,
The left and right fastening slider bars 33 are provided with rack gear portions 33a and 33b in the lateral direction which are engaged with the pinion gears on the outer peripheral portion of the back plate spacing adjusting portion 34 disposed at the center, Each of the rack gear portions 33a and 33b of the fastening slider bar 33 has a symmetrical structure so as to be engaged with the upper and lower ends of the pinion gear of the outer peripheral portion of the back plate spacing adjusting portion 34, Positioning device for backrest. 9. The method of claim 8,
The horizontal support frame 30 is provided with a first support plate 31 and a second support plate 30 which are provided as fixing means for fixing the front base plate 31 to the vertical support frame 10, The rear base guide plate 35 provided with the concave-convex slider 41 and the second concave-convex slider 42 and the elastic spring 43 therebetween is provided,
The back plate spacing adjustment member 34 disposed in the inner space between the front base guide plate 31 and the rear base guide plate 35 is positioned at the center of the backrest 20 so as to secure a predetermined position, A fixing slot 31b is protruded from a central portion of the base guide plate 31,
Wherein the locking nut (31c), into which the locking bolt (38) is inserted, is inserted in the center of the fixing slot (31b). 11. The method of claim 10,
On both sides of the fixing slot 31b, there is provided a sliding guide projection 31d which is formed to be laterally projected,
A sliding guide groove 33d is provided on an opposing surface of the right and left fastening slider bars 33 so as to maintain mutual meshing with the sliding guide protrusions 31d,
The fastening ends 33c of the right and left fastening slider bars 33 and the fastening ends 33c of the first and second backing plates 21 and 22 are slid on the left and right sides of the front base guide plate 31 while the left and right fastening slider bars 33 slide in the lateral direction, Wherein a transverse elongated hole (31a) is provided so that a fastening bolt (32) connecting between the fastening ends (22a) of the fastening holes (22) of the seat back . 11. The method of claim 10,
Wherein the rear base guide plate (35) is provided with a pivotable protective cover (39) to cover the rotary knob (37) and the locking bolt (38).

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