KR100474392B1 - a tilting chair - Google Patents

Abstract

The present invention relates to a tiltable chair, comprising: a first hinge shaft (24) hinged to a lower front of a seat plate, a second hinge shaft (26) hinged to a lower rear of the seat plate, and a front of the tilting case. A hinged third hinge shaft 28, a fourth hinge shaft 30 hinged to the rear of the tilting case, a front link 32 connecting the first hinge shaft and the third hinge shaft, and A rear link (34) connecting the second hinge shaft and the fourth hinge shaft, wherein the seat plate, the tilting case, the front link, and the rear link form a four-section link mechanism; The front link and the back plate are connected to each other at a predetermined angle by the back connector 36, and the third hinge shaft is provided with a back restoring elastic body for restoring the back plate by applying a restoring force to the front link and back connector; Since the fourth hinge shaft has an auxiliary back connector 72 coupled to the auxiliary back plate supporting the lumbar spine of the user, an auxiliary back restoring elastic body for restoring the auxiliary back plate by applying a restoring force to the auxiliary back connector is provided. In addition to improving comfort when tilting, the back of the chair prevents the shift pulling of the user's back and prevents the user's knees from being lifted. Also in the constant lumbar spine and give a sense of voids on the lumbar region during tilting to increase the convenience and effect of posture correction.

Description

Tilting chair {a tilting chair}

The present invention relates to a tiltable chair, and more particularly, to a tiltable chair in which the back plate and the seat plate are separated from each other.

In general, the chair is coupled to the back plate and the seat plate at a predetermined angle, and the legs are coupled to the lower side of the seat plate, and the seat plate and the back plate are wrapped by an outer shell in which a cushion member such as a sponge is built, and the user stretches the back plate. In order to make the back tilted back is disclosed a lot of structures that tilt the back.

These chairs are integrally formed with the back plate and the seat plate to be tiltable, or the back plate and the seat plate are separately tiltable.

1 shows a tiltable chair in which a conventional back plate and a seat plate are separated. As shown, a tilting case 4 having a tilting mechanism coupled therein is installed below the seat plate 2, and a connector 6 is hingedly connected to the tilting mechanism of the tilting case 4. The back plate 8 is connected to and erected at 6, and the rotating leg 10 is coupled to the lower side of the tilting case 4.

 In the conventional tiltable chair configured as described above, when the user is seated and presses the back plate 8 connected to the connector 6 backward, the entire back plate 8 pivots about a hinge point A at a predetermined angle. At this time, since the seat plate 2 is fixed to the tilting case 4, there is no change in position and angle. Then, when the force for pressing the back plate 8 is removed, the back plate 8 and the connector 6 are restored to their original positions by the elastic body (spring or torsion spring) provided in the tilting mechanism.

However, in the conventional tiltable chair configured as described above, as shown in FIG. 2A, when the user tilts his / her back in an initial state of sitting on the seat 2, the seat 2 is fixed. Since only the back plate 8 is folded back in the inclined state, the inclined path difference of the chair occurs according to the degree of inclination of the seated body. That is, a path difference occurs in which the initial point P1 supporting the user's back moves to the moving point P2 of FIG. 2B in FIG. In addition, the comfort is not only lowered, there is a problem that the user feels uncomfortable, such as the top of the chair (shift pulling) of the user's back (shift pulling) occurs to the top is swept up.

In addition, since there is no change in the position of the seat plate 2, there is a problem that the user's knees are lifted up when tilting, causing tension in the hamstrings.

On the other hand, in general, users rarely tilt in a tilting state as shown in FIG. 2A and tilt in a tilting state as shown in FIG. 2B, and place the buttocks slightly in the middle or center of the seat plate in the state of FIG. 2C. Will tilt. Therefore, there is more space behind the back (S2) to create a weak support effect of the lumbar spine, that is, since the center of rotation of the human body is located in the pelvis, it is inevitably different from the rotational trajectory of the chair back and the position of the lumbar support is changed. There was a problem that the support effect of the lumbar spine is significantly lowered, bringing a bunch to the lumbar spine.

Therefore, the present invention has been made to solve the above problems, the first object of the present invention to increase the comfort area by the user's back when tilting to increase the comfort as well as the phenomenon that the back of the chair sweeps the user's back (shift) It is to provide a tiltable chair that prevents pulling and prevents the user's knees from lifting up.

The second object of the present invention is to provide a tilting chair that not only supports a sitting posture but also supports a lumbar spine constantly in any sitting posture and does not feel a gap in the lumbar region during tilting, thereby increasing convenience and correcting posture. There is.

The tiltable chair for achieving the first object of the present invention is provided with a tilting case fixed to the rotation axis of the chair legs on the lower side of the seat plate, separated from the seat plate while forming a predetermined angle with respect to the seat plate of the user A tiltable chair having a back plate coupled thereto, comprising: a first hinge shaft hinged to a lower front of the seat plate, a second hinge shaft hinged to a lower rear of the seat plate, and hinged to a front of the tilting case. A third hinge shaft, a fourth hinge shaft hinged to the rear of the tilting case, a front link connecting the first hinge shaft and the third hinge shaft, and a rear connecting the second hinge shaft and the fourth hinge shaft. A link, wherein the seat plate, the tilting case, the front link and the rear link form a four-link link mechanism; The front link and the back plate are connected at a predetermined angle by the back connector, and the third hinge shaft is provided with a back restoring elastic body for restoring the back plate by applying a restoring force to the front link and back connector.

  A tiltable chair for achieving the second object of the present invention includes a tilting case fixed to a rotation axis of a chair leg at a lower side of the seat plate, separated from the seat plate, and forming a predetermined angle with respect to the seat plate. A tiltable chair having a back plate coupled thereto, comprising: a first hinge shaft hinged to a lower front of the seat plate, a second hinge shaft hinged to a lower rear of the seat plate, and hinged to a front of the tilting case. A third hinge shaft, a fourth hinge shaft hinged to the rear of the tilting case, a front link connecting the first hinge shaft and the third hinge shaft, and a rear connecting the second hinge shaft and the fourth hinge shaft. A link, wherein the seat plate, the tilting case, the front link and the rear link form a four-link link mechanism; The front link and the back plate are connected to each other at a predetermined angle by the back connector, and the third hinge shaft is provided with a back restoring elastic body for restoring the back plate by applying a restoring force to the front link and back connector; On the fourth hinge shaft, an auxiliary back connector which is coupled to an auxiliary back plate supporting a user's lumbar spine is fixed, and an auxiliary back restoring elastic body is provided to restore the auxiliary back plate by applying a restoring force to the auxiliary back connector. .

The tilting range adjusting unit is coupled to the third hinge shaft to adjust the tilting range of the back plate, and the tilting range adjusting unit is fixed to the third hinge shaft to protrude in a radial direction of the hinge shaft, and the locking mechanism rotates. While the end is sequentially made of a stopper is formed with a plurality of locking step in the stepped form, and the moving means for moving the stopper to change the position that the latch is engaged.

The moving means includes a rack gear provided in the stopper, a pinion snapped onto the rack gear, and a rotation shaft for rotating the pinion.

The tilt restoring elastic body coupled to the third hinge axis is coupled to a tilting strength adjusting part for adjusting the tilting strength by changing the elastic strength of the restoring restoring body, wherein the tilting strength adjusting part is fixed at the back restoring elastic body to be fixed to the third hinge. A torsion bar block protruding in the radial direction of the shaft, a power screw member coupled to the end of the torsion bar block by a power screw to move the end of the torsion bar block in an up and down direction, and restraining the longitudinal movement of the power screw member. By means of

The third hinge shaft is coupled to the front locking portion for locking the back plate so as not to be inclined more than a predetermined angle toward the front, the front locking portion is fixed to the third hinge shaft, the locking projection protruding in the radial direction of the hinge shaft, and the locking Constraining member for holding and holding the end of the locking mechanism so that the sphere does not rotate in one direction, and the operating means for holding or releasing the locking by moving the restraining member.

The backrest restoring elastic body coupled to the fourth hinge shaft is coupled to a lumbar support strength adjusting unit for adjusting the strength of the lumbar support by changing the elastic strength of the backrest restoring elastic body, wherein the lumbar support strength adjusting unit is configured to restore the auxiliary backrest. It has a pressing member for pressing the hook portion of the elastic member of the elastic body, and a rotating shaft fitted to the pressing member to rotate the pressing member, the outer surface of the pressing member is a plurality of flat surfaces in which the distance is gradually increased from the center of the rotating shaft in sequence It is formed.

The fourth hinge shaft is coupled to the lumbar support locking portion for locking the support angle of the lumbar spine so that the auxiliary back plate does not tilt forward more than a predetermined angle, and the lumbar support locking portion is fixed to the fourth hinge shaft and is fourth hinged. A flange protruding in the radial direction of the shaft, a restraining member for restraining the end of the flange so that the flange does not rotate in one direction, and the operation means for holding or releasing the locking by moving the restraining member.

The auxiliary back plate is rotatably coupled to the upper end of the auxiliary back connector and is movable up and down.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 shows a perspective view of the tiltable chair according to the first embodiment of the present invention, Figure 4 schematically shows the tiltable chair with the armrest removed in Figure 3; As shown, the tilting case 18 is fixed to the rotary shaft 16 of the chair leg 14 at the lower side of the seat plate 12, and the rear side of the seat plate 12 is provided with a back connector, which will be described later. The back plate 20 supporting the back is installed. Both sides of the seat plate 12 is provided with an armrest 22 that is capable of height adjustment.

The seat plate 12 and the back plate 20 are separated to form a predetermined angle to each other, and the cushion member and the outer shell, such as sponge is coupled, but this is a general configuration and will not be described in detail. In addition, since the armrest 22 and the chair leg 14 are also disclosed in various configurations, description thereof will be omitted.

The first hinge shaft 24 is hinged to the lower front of the seat plate 12, the second hinge shaft 26 is hinged to the lower rear of the seat plate 12, and the front of the tilting case 18. The third hinge shaft 28 is hinged to the rear, the fourth hinge shaft 30 is hinged to the rear of the tilting case 18, the first hinge shaft 24 and the third hinge shaft 28 Is connected by the front link 32, the second hinge shaft 26 and the fourth hinge shaft 30 is connected by the rear link 34, the seat plate 12 and the tilting case (18) And the front link 32 and the rear link 34 is a kinematic linkage mechanism is formed.

The front link 32 and the back plate 20 are connected at a predetermined angle by the back connector 36. The back connector 36 is fixed to the upper end of the front link 32, it is preferably fixed to the outer member (not shown) in contact with the first hinge shaft 24. An upper end of the front link 32 is fixed to the outer member contacting the first hinge shaft 24. The back connector 36 extends from the first hinge shaft 24 to the rear of the chair, leaves the seat plate, is bent upwards, and is a 봉 -shaped rod fixed to the back plate 20, and the first hinge shaft It consists of two rods connected to both sides (two sides of the chair in the width direction) of (24).

Figure 5 shows a tilting mechanism coupled to the inside of the tilting case of the tiltable chair according to the first embodiment of the present invention. As shown, support portions 18a and 18a 'supporting the third hinge shaft 28 protrude outwards on both sides of the front width direction of the tilting case 18, and the rear side of the tilting case 18. Support portions 18b and 18b 'supporting the fourth hinge shaft 30 are formed to protrude outwards on both sides in the width direction, and a rotating shaft of a tilting range adjustment unit to be described later between the support portion 18a and the support portion 18b. Support portion 18c for supporting the protruding outward in the width direction of the tilting case 18 is formed.

The third hinge shaft 28 is provided with a back restoring elastic body for restoring the back plate 20 by applying a restoring force to the front link 32 and the back connector 36. The back restoring elastic body is provided with a separate torsion spring or the like. Although the elastic member may be coupled to the structure, in this embodiment, the angular shaft portion 28a is formed on the third hinge shaft 28 itself so that the angular shaft portion 28a is an elastic member (for example, a torsion spring). It acts as a backrest to form an elastic body.

The angular shaft portion 28a is formed at both ends and the intermediate portion of the third hinge shaft 28, respectively. The front link 32 is fixed to each shaft portion formed at both ends of the third hinge shaft 28.

The portions of the third hinge shaft 28 and the fourth hinge shaft 30 that are seated on the supporting portions 18a, 18a ', 18b, and 18b' are formed in a cylindrical shape.

On the other hand, in each of the shaft portion formed in the middle portion of the third hinge shaft 28, the tilting range adjusting unit 40 for adjusting the tilting range of the back plate 20, the tilting strength by changing the elastic strength of the back restoring elastic body Tilting strength adjusting unit 50 for adjusting the, and the front locking unit 60 for locking so that the back plate 20 is not inclined forward more than a predetermined angle is combined.

As shown in FIG. 6, the tilting range adjusting unit 40 is fixed to the angular shaft portion 28a of the third hinge shaft and protrudes in the radial direction of the third hinge shaft, and the locking hole ( The stopper 42 is formed with a plurality of locking jaws 42a in a stepped manner so that the ends thereof are sequentially caught while the 41 is rotated, and the stopper 42 is changed to change the position at which the locking holes 41 are engaged. It consists of a moving means 43 for moving in the radial direction of the third hinge axis (28).

An insertion protrusion 44 is fitted to an end of the locking hole 41 so as to be easily caught by the locking jaw 42a. The insertion protrusion 44 may be integrally formed with the locking hole 41.

The stopper 42 has a prism shape as a whole, and the locking jaw 42a is formed in a stepped shape on the inclined surface thereof, and the rack gear 45 constituting the moving means 43 is fixed to the side surface thereof. The rack gear 45 may be integrally formed with the stopper 42.

The moving means 43 includes the rack gear 45 provided in the stopper 42, a pinion 46 snapped onto the rack gear 45, and a rotation shaft 47 for rotating the pinion 46. Is done. The rotating shaft 47 is formed with a bearing portion 47a seated on the supporting portion 18c of the tilting case 18 and slidingly contacted with the supporting portion 18c, and the pinion 46 is coupled to the rotating shaft 47. The opposite end is provided with a handle not shown.

In addition, a guide member 48 having a guide surface is coupled to the lower side of the stopper 42 to guide and slide the stopper 42 and the rack gear 45. The guide member 48 is fixed to the inner surface of the tilting case 18. On the other hand, a guide surface for guiding the stopper 42 and the rack gear 45 may be directly formed in the tilting case 18, in which case no separate guide member is necessary.

As shown in FIG. 6, the tilting strength adjusting unit 50 is fixed to the angular shaft portion 28a of the third hinge shaft and protrudes in the radial direction of the third hinge shaft, and the torsion bar. To the end of the block 51 by the electric screw coupled to the electric screw member 52 for moving the end of the torsion bar block in the vertical direction, and the restraining means 53 for restraining the longitudinal movement of the electric screw member 52 in the longitudinal direction. Is done.

At the end of the torsion bar block 51, an auxiliary block 54 is fitted and fixed, and a screw is formed in the auxiliary block 54 to which the electric screw member 52 is screwed. A screw may be formed on the torsion bar block 51 itself without the auxiliary block 54.

The transmission screw member 52 has a screw rod shape, the lower end of which is constrained by the restraining means 53 so that rotation is possible, but the rotation screw member 52 does not move in the longitudinal direction by this rotation. The transmission screw member 52 is extended to the outside of the tilting case 18 to be rotated by an adjustment handle (not shown).

The restraining means 53 is fitted with a bearing (not shown) in the plate-shaped fixing member 55 fixed inside the tilting case 18, the lower end of the transmission screw member 52 to the bearing It is a combined configuration.

As shown in FIG. 7, the front locking portion 60 is fixed to the angular shaft portion 28a of the third hinge shaft and is protruded in the radial direction of the third hinge shaft and the locking hole 61. ) Is made up of a restraining member 62 that restrains the end of the locking hole 61 so as not to rotate in one direction, and an actuating means 63 which moves or restrains the locking by moving the restraining member 62.

The restraining member 62 is a slide guided by a guide, not shown, of the tilting case 18.

The operation means 63, one end of the wire 64 is connected to one end of the restraining member 62, the operation member 65 is connected to the other end of the wire 64, the restraining member 62 Restoration spring 66 is coupled to the other end of the structure.

The wire 64 is generally the same as the configuration of a wire that is used for remote control a lot, the cable 67 is extrapolated in the middle portion of the wire, the engaging members 68, 68 ' In combination, the pulling force is directly transmitted to the restraining member 62 when the manipulation member 65 is pulled even when the middle portion of the wire 64 is bent.

The operation member 65 is a handle hinged to the fixing member 69, and has a locking function to maintain the rotation state when rotated at a predetermined angle. Thus, since the structure which the operation member 65 takes is a general structure, it abbreviate | omits description.

The restoring spring 66 is a tension spring whose one end is caught by the restraining member 62 and the other end is a tension spring which is held by the tilting case 18. The state of the restoring spring 66 is operated to release the pulled wire 64. The restoring force is provided when the restraining member 62 is returned to its lower surface.

In the tiltable chair according to the first embodiment of the present invention configured as described above, when the user presses the back plate to sit and tilt the seat plate, the seat plate 12, the back plate 20, etc. are indicated by a virtual line in FIG. This is transformed.

Specifically, as the user's back presses the back plate 20, a force is transmitted to the front link 32 through the back connector 36, so that the front link 32 moves the third hinge shaft 28. Rotate clockwise by tilting angle with the center of rotation. At this time, the seat plate 12 connected to the front link 32 by the first hinge shaft 24 is pulled rearward downward, and the rear link 34 rotates clockwise with the fourth hinge shaft 30 as the pivot center. While the parallelogram of the four-link mechanism formed by the seat plate 12, the tilting case 18, the front link 32, and the rear link 34 is crushed, the entire seat plate 12 is rearward downward. Inclined

 Therefore, when the seat 12 is tilted downward at the same time during tilting, the path difference does not occur, and the empty space generated behind the back becomes smaller, so that the area of the back of the user is increased and the comfort of the chair is increased. The shift pulling of the user's back does not occur, which eliminates inconvenience such as the top being swept up. In addition, because the seat itself is pushed back when tilting, the angle between the knee and thigh is maintained, thus preventing the hamstrings from straining the muscles.

When the force for pressing the back plate 20 is removed, the front link 32 is rotated counterclockwise by the back restoring elastic body provided in the third hinge shaft 28 so that the back plate 20 and the seat plate 12 are rotated. It is restored to its original position.

Meanwhile, the tilting range of the back plate 20 may be adjusted by adjusting the tilting range adjusting unit 40. That is, when the front link 32 rotates, the angular shaft portion 28a of the third hinge shaft 28 is rotated clockwise and twisted so that the back plate 20 is tilted at a predetermined angle. As shown in the insertion projection 44 fitted to the end of the locking hole 41 is caught by the locking jaw 42a of the stopper 42 does not tilt over a predetermined angle. At this time, when the pinion 46 is rotated by rotating the rotary shaft 47 to move the rack gear 45 bite backward, the insertion protrusion 44 as shown in Figs. 9B and 9C. Since the catch 41 can be rotated until it is caught by the catching jaw formed on the lower side of the stopper 42, it can be tilted at a larger angle.

In addition, the tilting strength may be adjusted by adjusting the tilting strength adjusting unit 50. When the rotating screw member 52 shown in FIG. 6 is rotated by rotating the adjustment handle (not shown), the right end portion of the torsion bar block 51 may be adjusted. As it rises or falls, the torsion bar block 51 to adjust the torsional strength of the angular axis portion 28a is fixed.

In addition, the back plate 20 can be prevented from inclining forward more than a predetermined angle by the front locking part 60. As shown in FIG. 7, the operation member 65 is rotated to pull the wire 64 to restrain it. Since the member 62 is moved to support the end of the locking hole 61, the third hinge shaft 28 cannot be rotated more than a predetermined angle in the direction opposite to the tilting direction. The front locking part 60 is restrained during normal use and used as a general chair, but when the locking part is released, the seat plate and the back of the chair are inclined forward to maximize efficiency at work.

Accordingly, by adjusting the tilting range adjusting unit 40, the tilting strength adjusting unit 50, and the front locking unit 60, the tilting amount and the tilting strength may be variously adjusted according to the user's preference and physical condition.

Fig. 10 shows a perspective view of the tiltable chair according to the second embodiment of the present invention, and Fig. 11 schematically shows the tiltable chair with the armrest removed from Fig. 10. This second embodiment is the first embodiment of the first embodiment. On the four hinge shafts 30, the auxiliary back plate connector 72 to which the auxiliary back plate 70 supporting the lumbar spine of the user is coupled is fixed, and the auxiliary back plate 70 is applied by applying a restoring force to the auxiliary back plate connector 72. The back plate restoring elastic body 74 (represented by a torsion spring in Fig. 12) for restoring is combined. Since the rest of the configuration is the same as in the first embodiment, the same reference numerals are used and the description is omitted.

Figure 12 shows a tilting mechanism coupled to the inside of the tilting case of the tiltable chair according to the second embodiment of the present invention. As shown, between the support part 18a 'of the tilting case 18 and the support part 18b', the support part 18d which supports the rotation axis of the lumbar support weakening adjustment part mentioned later is the width direction outer side of the tilting case 18. As shown in FIG. Protrudes to form.

The fourth hinge shaft 30 is coupled to the auxiliary back restoring elastic body for restoring the auxiliary back plate 70 by applying a restoring force to the auxiliary back connector 72, the auxiliary back restoring elastic body is the fourth hinge shaft 30 ) Is made of an elastic member, such as a separate torsion spring 74, which is extrapolated. The torsion spring 74 is composed of two torsion springs 74a and 74b which are divided to both sides with a pressing member between the lumbar support strength and weakness adjustment portions described later. In addition, a flange 76 having a pin 75 protrudes from the fourth hinge shaft 30 so that the hook portion of the torsion spring is caught. The auxiliary backrest restoring elastic body may be made of an elastic member such as a torsion bar.

On the other hand, in the middle portion of the fourth hinge shaft 28, the lumbar support strength and weakening portion 80 for adjusting the strength of the lumbar support, and the auxiliary back plate 70 is locked so as not to tilt forward more than a predetermined angle Lumbar support locking portion 90 is coupled.

As shown in Figure 13, the lumbar support strength and weakness adjustment portion 80, the pressing member 82 for pressing the hook plate 81 that is caught on the hook portion of the torsion spring 74 of the auxiliary back plate restoration elastic body, and the pressing It is provided with the rotating shaft 83 which is fitted to the member 82 and rotates this press member 82. As shown in FIG.

The hook plate 81 is positioned between the two torsion springs 74a and 74b so that one end thereof is fitted to the fourth hinge shaft 30 and the other end thereof protrudes in the tangential direction of the fourth hinge shaft 30. It hangs on the hook part of torsion spring 74a, 74b. The hook plate 81 has flanges 81a and 81a 'that are bent on both sides thereof in the width direction so as to simultaneously hook adjacent hook portions of the two torsion springs 74a and 74b.

As shown in Fig. 14, the pressing member 82 has a plurality of flat surfaces F1 in which its distance (radius r1, r2, r3, r4, r5) is increased stepwise from the center of the rotation shaft 83 on its outer surface. , F2, F3, F4, F5) are sequentially formed.

The rotary shaft 83 is formed with a bearing portion 83a which is seated on the support portion 18d of the tilting case 18 and is in sliding contact with the support portion 18d, and the pressing member 82 is rotated on the rotation shaft 83. The combined opposite end is provided with a handle not shown. In addition, bushes 84 and 84 'are fitted to both side portions of the rotating shaft 83 to which the pressing member 82 is coupled and supported by the supports 18e and 18e' formed in the tilting case 18 (shown in FIG. 12). ).

The lumbar support locking portion 90 has a structure similar to the front locking portion 60 of the first embodiment, and is fixed to the fourth hinge shaft 30 and protrudes in the radial direction of the fourth hinge shaft. And a restraining member 92 for restraining the end of the flange so that the flange 76 does not rotate, and an actuating means 93 for moving or restraining the locking by moving the restraining member 92. The flange may be replaced by a separate locking hole, but it is preferable to be used in common with the flange to which the pin 75 to which the hook portion of the torsion spring 74 is engaged as in the present embodiment.

The restraining member 92 is a slide guided by a guide, not shown, of the tilting case 18. The operating means 93, one end of the wire 94 is connected to one end of the restraining member 92, the operation member 95 is connected to the other end of the wire 94, the restraining member 92 Restoration spring 96 is coupled to the other end of the structure.

Since the configuration and action of the lumbar support locking portion 90 are similar to the configuration and action of the front locking portion 60 of the first embodiment, a detailed description thereof will be omitted.

As shown in FIG. 15, the auxiliary back plate 70 is a flange to which the connecting member 77, which is extrapolated to the auxiliary back plate connectors 72 and 72 'fixed to both ends of the fourth hinge shaft 30, is hinged. 70a, 70a 'are formed in a curved surface to support the back comfortably. As shown in FIG. 17, the connecting member 77 is moved up and down with respect to the auxiliary back connector 72, and is locked at a predetermined position by a known lock 78. As shown in FIG. Since the auxiliary back plate 70 is hinged to the connecting member 77 as described above, the auxiliary back plate 70 is rotatable as shown in FIG.

In the tiltable chair according to the second embodiment of the present invention configured as described above, when the user presses the back plate to sit and tilt the seat plate, the seat plate 12 and the back plate 20 are deformed and tilted. Since it is the same as an example, description is abbreviate | omitted and only the operation | movement of the auxiliary back board 70 is demonstrated.

When the user M is tilted in a sitting position as shown in FIG. 16A, the user's hip pushes the auxiliary back 70 part backward, and the auxiliary back 70 is connected to the fourth hinge shaft 30. Receiving tension by the installed torsion spring 74, it is rotated about the fourth hinge shaft 30 and pushed back, thereby bringing the same state as in FIG. 16B.

At this time, the back plate 20 rotates the third hinge shaft 28 to the center of rotation, and the auxiliary back plate 70 rotates the fourth hinge shaft 30 to the center of rotation, so that the center of rotation is different, resulting in a path difference between the two back plates. This is a tension of the flexible back itself, which absorbs the path difference caused by the relative motion of the back and the back.

When the force for pressing the auxiliary back plate 70 is removed, the auxiliary back plate connector 72 is rotated counterclockwise by the auxiliary back plate restoring elastic body (torsion spring) provided in the fourth hinge shaft 30 to allow the auxiliary back plate ( 70) is restored to its original position.

On the other hand, when the user (M) tilts the buttocks slightly in the middle or center of the seat plate to tilt the state of Figure 16c, the auxiliary back plate 70 is changed to match the angle of the lumbar region to support the lumbar region As a result, there is a feeling of support to the lumbar spine at all times, so that no space is felt at the lumbar region during tilting, thereby increasing convenience and postural correction.

Then, the tilting strength of the auxiliary back plate can be adjusted by adjusting the lumbar support strength and weakness adjusting unit 80. When the handle (not shown) is rotated to rotate the rotation shaft 83 shown in FIG. Since the flat surface of the pressing member 82 in close contact with the hook plate 81 is changed, the amount of pressing the hook portion of the torsion spring 74 is changed so that the torsional strength is adjusted.

In addition, it is possible to prevent the auxiliary back plate 70 from tilting forward by a predetermined angle or more by the lumbar support locking portion 90. As shown in FIG. 13, the operation member 95 is rotated to rotate the wire 94. When pulling, the restraining member 92 moves to support the end portion of the flange 76, so that the fourth hinge shaft 30 cannot rotate more than a predetermined angle in the direction opposite to the tilting direction. The lumbar support locking unit 90 is inclined forward to function as a separate function or close to the back plate to adjust the function of the back plate.

The present invention is not limited to the above embodiment and can be modified in various ways.

According to the tiltable chair according to the present invention, by increasing the area that the back touches when tilting not only increases the comfort, but also prevents the back of the chair to lift the user's back (shift pulling) and do not lift the user's knees Relieves the tension of the hamgeum, not only in the sitting posture, but also in any sitting posture at all times to support the lumbar spine and tilting the lumbar region during the tilting to improve the convenience and effect of posture correction.

1 is a schematic configuration diagram showing a tiltable chair in which a conventional back plate and a seat plate are separated;

2a to 2c is a view showing a tilting state in the chair of Figure 1,

3 is a perspective view of a tiltable chair according to a first embodiment of the present invention;

4 is a schematic configuration diagram showing a tiltable chair in a state in which the armrest is removed from FIG. 3;

5 is a perspective view showing a tilting mechanism coupled to the inside of the tilting case of FIG. 3;

6 is a perspective view illustrating a tilting range adjusting unit and a tilting strength adjusting unit of FIG. 5;

7 is a perspective view of the front locking part of FIG. 5;

8 is an operational state diagram of the tiltable chair according to the first embodiment of the present invention;

9a to 9c is an operation state diagram of the tilting range adjustment unit of FIG.

10 is a perspective view of a tiltable chair according to a second embodiment of the present invention;

FIG. 11 is a schematic configuration diagram illustrating a tiltable chair in which a part of the armrest is tilted with the armrest removed from FIG. 10; FIG.

12 is a perspective view showing a tilting mechanism coupled to the inside of the tilting case of FIG. 10;

FIG. 13 is a perspective view illustrating the lumbar support strength and weakness adjustment part and the lumbar support locking part in FIG. 12; FIG.

14 is a cross-sectional view of the pressing member and the hook plate in the lumbar support strength and weakening portion of FIG.

FIG. 15 is a view of the auxiliary ramp of FIG. 10 from above; FIG.

16a to 16c is an operation state diagram of the tiltable chair according to the second embodiment of the present invention,

17 and 18 are operational state diagrams of the auxiliary back plate of FIG.

<Description of the symbols for the main parts of the drawings>

12: seat 18: tilting case

20: back 24: first hinge axis

26: second hinge axis 28: third hinge axis

30: 4th hinge axis 32: front link

34: rear link 36: back connector

40: tilting range adjustment unit 50: tilting intensity adjustment unit

60: front locking portion 70: auxiliary back

72: auxiliary back connector 80: lumbar support strength adjustment unit

90 lumbar support locking part

Claims (10)

In the lower side of the seat plate is provided with a tilting case fixed to the rotation axis of the chair legs, the tiltable chair coupled to the back plate supporting the user's back while being separated from the seat plate to form a predetermined angle with respect to the seat plate, A first hinge shaft hinged to the lower front of the seat plate, a second hinge shaft hinged to the lower rear of the seat plate, a third hinge shaft hinged to the front of the tilting case, and a rear of the tilting case. A fourth hinge shaft hinged to the first link shaft, a front link connecting the first hinge shaft and the third hinge shaft, and a rear link connecting the second hinge shaft and the fourth hinge shaft, and the seat plate and the tilting case. The front link and the rear link form a four-link mechanism; The front link and the back plate are connected to each other at a predetermined angle by a back connector, and the third hinge shaft is provided with a back restoring elastic body for restoring the back plate by applying a restoring force to the front link and back connector. Chair available. In the lower side of the seat plate is provided with a tilting case fixed to the rotation axis of the chair legs, the tiltable chair coupled to the back plate supporting the user's back while being separated from the seat plate to form a predetermined angle with respect to the seat plate, A first hinge shaft hinged to the lower front of the seat plate, a second hinge shaft hinged to the lower rear of the seat plate, a third hinge shaft hinged to the front of the tilting case, and a rear of the tilting case. A fourth hinge shaft hinged to the first link shaft, a front link connecting the first hinge shaft and the third hinge shaft, and a rear link connecting the second hinge shaft and the fourth hinge shaft, and the seat plate and the tilting case. The front link and the rear link form a four-link mechanism; The front link and the back plate are connected to each other at a predetermined angle by the back connector, and the third hinge shaft is provided with a back restoring elastic body for restoring the back plate by applying a restoring force to the front link and back connector; The fourth hinge shaft, the auxiliary back connector is coupled to the auxiliary back plate supporting the user's lumbar spine, while the auxiliary back restoring elastic body for restoring the auxiliary back plate by applying a restoring force to the auxiliary back connector, characterized in that the Tilting Chair. The method according to claim 1 or 2, The third hinge shaft is coupled to the tilting range adjusting unit for adjusting the tilting range of the back plate, The tilting range adjustment unit, A locking hole fixed to the third hinge shaft and protruding in a radial direction of the hinge shaft; A stopper having a plurality of locking jaws formed in a step shape such that the end portions thereof are sequentially caught while the locking holes rotate; And a moving means for moving the stopper to change the position at which the catch is caught. The method of claim 3, The means for moving, And a rack gear provided to the stopper, a pinion to be bitten by the rack gear, and a rotating shaft for rotating the pinion. The method according to claim 1 or 2, The backrest restoring body coupled to the third hinge shaft is coupled to a tilting strength adjusting part for controlling the tilting strength by changing the elastic strength of the backrest restoring body, The tilting strength adjustment unit, A torsion bar block fixed in the back restoring elastic body and protruding in a radial direction of a third hinge axis; An electric screw member coupled to an end portion of the torsion bar block to move an end portion of the torsion bar block in an up and down direction; Tilting chair characterized in that made of restraining means for restraining the longitudinal movement of the electric screw member. The method according to claim 1 or 2, The third hinge shaft is coupled to the front locking portion for locking the back plate not to be inclined forward more than a predetermined angle, The front locking part, A locking hole fixed to the third hinge shaft and protruding in a radial direction of the hinge shaft; A restraining member configured to support and restrain the end of the latch so that the latch does not rotate in one direction; The tiltable chair, characterized in that consisting of operating means for maintaining or releasing the locking by moving the restraining member. The method of claim 2, The auxiliary back restoring elastic body coupled to the fourth hinge shaft is coupled to a lumbar support strength and weakening part for controlling the strength of lumbar support by changing the elastic strength of the auxiliary back restoring elastic body, The lumbar support strength and adjustment unit, Pressing member for pressing the hook portion of the elastic member of the auxiliary back plate restoration elastic body, A rotary shaft fitted to the pressing member to rotate the pressing member, The tiltable chair, characterized in that the outer surface of the pressing member is formed with a plurality of flat surfaces sequentially increasing its distance from the center of the rotation axis. The method of claim 2, The fourth hinge shaft is coupled to the lumbar support locking portion for locking the support angle of the lumbar spine so that the auxiliary back plate does not tilt forward more than a predetermined angle, The lumbar support locking portion, A flange fixed to the fourth hinge shaft and protruding in a radial direction of the fourth hinge shaft; A restraining member configured to support and restrain the end of the flange so that the flange does not rotate in one direction; The tiltable chair, characterized in that consisting of operating means for maintaining or releasing the locking by moving the restraining member. The method of claim 2, And the auxiliary back plate is pivotally coupled to an upper end of the auxiliary back connector. The method of claim 2, The auxiliary back plate is tiltable chair, characterized in that coupled to move up and down at the upper end of the auxiliary back connector.