JP2012527945A - Chair with adjustable backrest angle - Google Patents

Abstract

The present invention relates to a chair, and in particular, in a chair configured such that the angle of the backrest can be changed with respect to a support portion to which the backrest is connected so that the user can use it more easily. A backrest provided with a rotation shaft and a displacement shaft on a side; a housing fixedly installed on the support and provided with a rotation shaft connection hole to which the rotation shaft is coupled; formed in the housing and connected to the displacement shaft And a displacement assembly including a movable block capable of changing the angle of the backrest while sliding in a straight line; and a locking king means capable of selectively fixing the position of the movable block; Technology.

Description

  The present invention relates to a chair, and more particularly to a technique that allows a user to easily adjust a backrest angle so that a user can use it more easily.

  The most important part for the person who walks upright is the spine, and when an abnormality occurs in the spine, it affects the entire body and induces a great hindrance to normal living.

  As you get older, the bone density naturally decreases and the spine bends, but even younger people often suffer from spinal abnormalities. A typical spinal disease is a lumbar disc, and there are various causes of its onset. In particular, most people spend a lot of time sitting on a chair rather than walking because most people sit on the chair to work or read at home.

  When sitting in a chair, you must sit in a correct posture with your waist upright. However, many people work with their hips bent forward due to wrong habits. In many cases, the chair rests on the back of the chair for rest, and then lies down, but most chairs are designed so that the back cannot reliably support the lumbar part. give.

  In view of such problems, a plurality of conventional techniques have been proposed. Hereinafter, the related art will be schematically described.

  FIG. 1 shows an operational state diagram for a “chair” (hereinafter referred to as “prior art 1”) of Korean Utility Model Registration No. 336016, and includes a lower support 60 to which a seating base 30 is coupled, as shown in FIG. In this technique, the upper support 50 is rotatably coupled by a hinge shaft 102 formed at the upper end of the lower support 60, and a torsion spring 80 is used as an elastic coupling means.

  The technique has a structure in which the upper support 50 can be rotated and laid when the user curves his / her waist from a straight sitting posture. However, there is a disadvantage that the upper support 50 cannot be fixed. Also, from a structural aspect, it cannot support a large load and is inferior in durability. Therefore, there is a limit to application to such an expensive office chair.

  In addition, Japanese Patent Publication No. 2003-061777 has a technique related to “seat frame” (hereinafter referred to as Conventional Technology 2). FIG. 2 is a schematic perspective view corresponding to this, and FIG. 3 is a partially exploded perspective view.

  The related art 2 relates to a vehicle seat frame, and includes a seat back frame 2 and a seat cushion frame 3. A reclining device 8 for adjusting the angle of the seat back frame 2 is provided between the seat back frame 2 and the seat cushion frame 3. The reclining device 8 has a circular outer shape and includes a lock device.

  Further, by operating the lever 82, the shaft 81 integrally fixed to the lever 82 is rotated to release the lock mechanism. The reclining device 8 having such a structure is a technique already known as a vehicle chair.

  However, there is a problem that it is not preferable in terms of cost to apply a chair having a complicated frame structure as in the prior art 2 to a product such as an office chair. Further, in the prior art 2, the angle of the seat back frame 2 can always be adjusted by first rotating the lever 82, and since the minimum rotation angle is determined, the fine angle adjustment is impossible. There was also.

Japanese Patent No. 2003-061777 Korea Utility Model Registration No. 336016

  The present invention is suitable for office chairs and the like, and when the user leans against the backrest and applies force backward, the backrest can be tilted and the tilted angle can be maintained at an appropriate position. It is an object of the present invention to provide a chair with adjustable backrest angle.

  It is another object of the present invention to provide a chair capable of adjusting the backrest angle so that the repulsive force of the backrest can be appropriately adjusted according to the user when the backrest is tilted.

  In addition, the chair of the present invention is configured so that the backrest can be laid completely horizontally so that storage and transportation can be facilitated, so that transportation costs and storage costs can be reduced. The purpose is to provide.

  The present invention for achieving the above-described problem is a chair configured such that the angle of the backrest can be changed with respect to the support portion to which the backrest is connected. A backrest provided with a displacement shaft; a housing fixedly installed on the support portion and provided with a rotation shaft coupling hole to which a rotation shaft is coupled; formed inside the housing, coupled to the displacement shaft and slid linearly A displacement assembly including a movable block that allows the angle of the backrest to be changed while being moved; and a locking king means capable of selectively fixing the position of the movable block. We propose a chair with adjustable backrest angle.

  Preferably, the displacement assembly includes a movable block that moves along a slide groove inside the housing; one end is connected to the movable block, and the other end is threaded on the outer surface, and the thread is fixed. A movable bar installed in a form surrounding the supporting shaft; an elastic body inserted into an outer surface of the movable bar; a moving gear coupled to a screw thread of the movable bar to form gear teeth; The present invention proposes a chair with adjustable backrest angle, comprising: a gear portion that meshes with a gear, and an operation portion that includes an adjustment lever that is connected to the gear portion and protrudes to the outside of the housing.

  Preferably, the lock king means is fitted near the end of the operation portion on the opposite side of the adjustment lever and is rotated to form a rotation protrusion protruding outside the housing. We propose a chair with adjustable backrest angle.

  Preferably, the lock king means is partially formed with a tap so that it can be coupled to the movable block, and a corresponding tap is also formed on one side of the movable block facing the lock king means. We propose a chair with adjustable backrest angle.

  Preferably, the lock king means is bent in a “└” shape, and one end protrudes outside the housing and can be rotated; and a fitting fitted to the other end of the lock switch A chair with adjustable backrest angle, comprising: a lock block provided with a groove and having a tooth profile that meshes with the movable block; and a support that elastically supports the lock block. .

  Preferably, the elastic body is any one of a spring, a rubber material, and a hydraulic / pneumatic spring. A chair with adjustable backrest angle is proposed.

  Preferably, the rotation shaft is inserted to be connected to the backrest through the rotation shaft connection hole outside the housing, and when the backrest is folded horizontally, the rotation shaft is pulled out from the housing and separated. A chair with adjustable backrest angle is proposed.

  Preferably, the rotating shaft is provided with an O-ring groove to which an O-ring is coupled. When the rotating shaft is inserted through the rotating shaft connecting hole, the O-ring is compressed and then formed at an end of the rotating shaft connecting hole. A chair capable of adjusting the backrest angle is proposed in which a coupling is formed by returning to the original state after passing through the locking protrusion.

  Preferably, the elastic body is required when the backrest is tilted by the movement of the movable gear attached to the movable bar by the operation of the adjustment lever, and thereby the degree of compression of the elastic body is changed. We propose a chair with adjustable backrest, which can change the applied pressure.

  The chair with adjustable backrest angle according to the present invention can rotate only the backrest independently, and can maintain the position at a desired angle, so that it is possible to provide a chair that can be rested comfortably. Play.

  In addition, there is an advantage that the repulsive force of the backrest can be adjusted, and there is an effect that the rotation axis of the backrest is provided in the vicinity of the lumbar vertebra and the lumbar portion can be stably supported even if the backrest is inclined backward.

  In addition, the backrest can be tilted horizontally during storage and transportation, thereby minimizing the occupied space and reducing costs.

It is an operation state figure to prior art 1. It is a schematic perspective view with respect to the prior art 2. FIG. It is a partial exploded perspective view with respect to the prior art 2. FIG. It is a side view with respect to the principal part of the chair which can adjust the backrest angle comprised by preferable one Embodiment of this invention. It is a side view which shows the state by which the backrest was folded horizontally. It is a disassembled perspective view with respect to the principal part. It is a perspective view of the assembly state with respect to the principal part. It is a schematic sectional drawing to a rotating shaft. FIG. 6 is a cross-sectional view of still another possible example of a rotating shaft. It is a side view with respect to the principal part of the chair by 2nd Embodiment. It is a side view which shows the state by which the backrest of 2nd Embodiment was folded. It is a disassembled perspective view with respect to the principal part of 2nd Embodiment. It is a joint perspective view showing the principal part of a 2nd embodiment.

(First embodiment)
More specific embodiments based on the technical idea of the present invention will be described. Reference is made to the accompanying drawings as a means for better understanding. The accompanying drawings show an example that can be implemented by the technical idea of the present invention, and the technical scope of the present invention is not limited to the drawings themselves.

  FIG. 4 attached herewith is a side view with respect to the main part of the chair with adjustable backrest angle constructed according to a preferred embodiment of the present invention, FIG. 5 is a side view showing a state in which the backrest is folded horizontally, 6 is an exploded perspective view of the main part, and FIG. 7 is a perspective view of the assembled state of the main part.

  As shown in the figure, the chair of the present invention is characterized in that the angle of the backrest can be adjusted to an appropriate inclination according to the user's selection. A backrest 100 having a displacement axis (not shown), a housing 200, a displacement assembly 300, and a locking king means 400 are included.

  The chair capable of adjusting the backrest angle according to the present invention is basically provided with a backrest 100 that can support the back portion of the user, and the backrest 100 is connected to the support portion 90. The support part 90 constitutes a part of the chair, and means a part protruding from the left and right upper parts of the seat part. The armrest portion may be a part of the armrest portion, or may be a member separate from the armrest portion and connected to the armrest portion.

  A rotation shaft 110 and a displacement shaft (not shown) can be protruded and coupled to the lower end of the backrest 100 on the left and right sides, and the rotation shaft 110 and the displacement shaft can be attached to and detached from the backrest 100. The rotation shaft 110 and the displacement shaft are positioned adjacent to each other, the rotation shaft 110 is coupled to the rotation shaft coupling hole 210 of the housing 200, and the displacement shaft is coupled to the movable block 310.

  The housing 200 according to the present invention is coupled to the support portion 90, is formed in a substantially square box shape, and includes a housing body 200a and a housing lid 200b. Further, the housing 200 is provided with a rotating shaft connecting hole 210, and in the case of this embodiment, the housing 200 is provided in a form protruding from one side surface of the housing body 200a.

  More preferably, in the present invention, the rotating shaft 110 is inserted outside the housing body 200a so as to be connected to the backrest 100 through the rotating shaft connecting hole 210, and when the backrest 100 is folded horizontally, the rotating shaft 110 is It has a structure that can be extracted and separated outside the housing body 200a.

  When the rotating shaft 110 is inserted through the rotating shaft connecting hole 210, the rotating shaft 110 is connected to the backrest 100 and functions so that the backrest can be rotated. When the rotating shaft 110 is removed, the backrest 100 is connected to the housing 200 only through the displacement shaft, and at this time, the displacement shaft functions as a rotating shaft.

  In the present invention, the rotary shaft 110 may be inserted from the outside of the housing body 200a through the rotary shaft connecting hole 210 so as to be connected to the backrest 100. Conversely, the rotary shaft 110 connected to the backrest 100 is provided. The outside of the housing body 200a is pulled out so that it can be folded using the backrest 100.

  On the other hand, the rotating shaft 110 should not come out of the rotating shaft connecting hole 210 in a situation not intended by the user. That is, since the rotation shafts 110 are inserted through the rotation shaft connection holes 210 and connected to the backrest 100 on both the left and right sides of the backrest 100, the rotation shaft 110 comes out little by little when the chair is used for a long time. there is a possibility. This is because no matter how precise the backrest is made or assembled, errors can only occur, and the rotation of the backrest on the left and right sides of the backrest often changes during the process of frequently changing the angle of the backrest, leaning against the backrest, or sitting properly. This is because an asymmetric force is applied to the shaft 110.

  Accordingly, in order to prevent the rotating shaft 110 from inadvertently coming out of the rotating shaft connecting hole 210 in the present invention, an O-ring groove 111 in which an O-ring O can be coupled is formed on the rotating shaft 110. . FIG. 8 attached herewith shows a schematic cross-sectional view with respect to the rotating shaft. An O-ring groove 111 is formed in the vicinity of the middle of the rotating shaft 110 and a rubber-made O-ring O is fitted into the O-ring groove 111.

  When the rotating shaft 110 is inserted through the rotating shaft connecting hole 210 in a state where the O ring O is coupled to the O ring groove 111, the O ring O is inserted into the rotating shaft connecting hole 210 while being compressed, and the rotation is performed. When the end of the shaft coupling hole 210 is reached, the O-ring O is restored to its original form again. A locking protrusion 220 is formed at the end of the rotation shaft coupling hole 210, and the O-ring O is released from the compression when it passes through the locking protrusion 220 and is restored to its original form.

  When the O-ring O coupled to the rotating shaft 110 passes through the locking protrusion 220 of the rotating shaft connecting hole 210, the outer diameter of the O-ring O is larger than the inner diameter of the rotating shaft connecting hole 210. Due to the stopper action, the rotating shaft 110 cannot be easily removed in situations not intended by the user.

  Of course, when the user applies an external force to pull out the rotating shaft 110, the rotating shaft 110 and the O-ring O can be removed together through the rotating shaft connecting hole 210.

  More preferably, the left end portion of the rotating shaft 110 in the drawing is formed to have the largest diameter than other portions, and this portion is referred to as a head 112. The head 112 is inserted into the rotary shaft connecting hole 210 from the opposite end, and the head 112 is coupled to be hooked on the tip of the rotary shaft connecting hole 210 formed in the housing. The reason why the head 112 is formed on the rotary shaft 110 is that when the chair is used with the rotary shaft 110 coupled, when the user takes the handle of the chair and opens it to the outside, the rotary shaft 110 is connected to the rotary shaft connecting hole 210. This is for the purpose of preventing the user from leaving.

  On the other hand, FIG. 9 shows another possible example of the rotating shaft.

  The main feature of the present invention is that the rotating shaft 110 can be assembled or separated outside the housing 200 as required. Other possible embodiments include a first ball stopper method and a fixing bolt method.

  As shown in the figure, the ball stopper system is provided with a ball B supported by a spring on the outer surface of the rotating shaft 110, and a ball groove (in which the ball B can be stored in the rotating shaft connecting hole 210). (Not shown) to form a constraint. Further, in the fixed bolt method, a flange portion G is formed on the outer surface of the rotating shaft 110 while being rounded, and a bolt hole (not shown) connected to the rotating shaft connecting hole 210 is formed in the housing. When the bolt (not shown) is formed and tightened, the bolt is fitted and fixed to the flange portion G.

  A displacement assembly 300 including a movable block 310 and a lock king means 400 are installed inside the housing 200. A displacement shaft is connected to the movable block 310, and the backrest 100 is rotated by a linear movement. It can be rotated with reference to. Further, the lock king means 400 plays a role of restraining the backrest 100 so that it can be fixed at a desired point.

  More specifically, the displacement assembly 300 and the locking king means 400 will be described. The displacement assembly 300 includes a movable block 310, a movable bar 320, an elastic body 330, a moving gear 340, and an operation unit 350.

  The movable block 310 can move linearly along a slide groove 241 formed in the housing body 200a, and is provided with a displacement shaft connection hole 311 to which a displacement shaft (not shown) can be connected. Further, a tap (not shown) is formed on one side of the movable block 310 (a surface facing the locking king means) so as to be able to be coupled to the locking king means 400, and the slide groove 241 is formed in the movable block 310. Any form may be used as long as they can be coupled to each other so that they can move linearly. In particular, an incision is formed in a partial section of the slide groove 241 so that the lock king means 400 and the movable block 310 can be constrained so that the movable block 310 can be fixed by the lock king means.

  The movable block 310 is connected to the movable bar 320, and the movable bar 320 is a long bar-like member. One end of the movable block 310 is connected to the movable block 310, and the other end is inserted while being circumscribed by the support shaft 360. Is done. The support shaft 360 is fixed to the housing 200, and the movable bar 320 can be linearly moved while being inserted into the support shaft 360. In particular, a thread 321 is formed on the outer surface of a predetermined region at the other end of the movable bar 320, and a moving gear 340 is coupled to the thread 321. Due to the movement of the movable block 310, the movable bar 320 also moves linearly together.

  Meanwhile, an elastic body 330 is installed on the outer surface of the movable bar 320, and a general coil spring can be used as the elastic body. As the elastic body 330, a material such as a rubber material or a hydraulic / pneumatic spring can be used in addition to a coil spring.

  In the present embodiment, the case where a spring is used is shown. However, the elastic body 330 can be compressed by rotating the moving gear 340 using the adjusting lever 352 and moving the back 100. When adjusting the angle by tilting, it becomes an element that determines the minimum force that the user should apply to the backrest, and when the tilted backrest is standing upright, it can be easily restored by the repulsive force of the elastic material It also functions.

  In addition, a moving gear 340 is coupled to the thread 321 of the movable bar 320, and gear teeth are formed on the outer peripheral surface of the moving gear 340. The elastic body 330 inserted into the movable bar 320 is not detached when the moving gear 340 is connected to the movable bar 320, and the moving gear 340 is threaded 321 of the movable bar 320 according to the rotation direction of the operation unit 350 described later. Move around. That is, the elastic body 330 can be compressed or the compression force can be released according to the moving direction of the moving gear 340.

  More preferably, when the elastic body 330 and the moving gear 340 are installed, the moving gear 340 and the moving gear 340 can be prevented from being worn by being in direct contact with the moving gear 340. A contact prevention body 335 is provided between the elastic body 330. The contact preventer 335 is also inserted into the movable bar 320.

  Next, the operation unit 350 will be described. The operation unit 350 is also an element constituting the displacement assembly 300, and is a long bar-like member installed inside the housing 200. A gear part 351 that meshes with the moving gear 340 is formed in a partial region, and the gear part 351 The adjustment lever 352 is connected and protrudes to the outside of the housing 200. Also, a lock king means 400 is installed in the vicinity of the opposite end of the operation portion to which the adjustment lever 352 is connected so that the locking king means 400 can be rotated. When the adjustment lever 352 is rotated, a gear portion is provided. The operation unit 350 including 351 rotates, and the moving gear 340 that meshes with the gear unit 351 moves on the thread 321 of the movable bar 320 while being rotated.

  The lock king means 400 can fix the position of the movable block 310, and is provided with a rotation protrusion 410 that protrudes to the outside of the housing 200 and can be easily operated. By rotating while being inserted in the vicinity of one end of the operation unit 350, the movable block 310 can be connected to or disconnected from the movable block 310.

  That is, a tap 420 is formed on the movable block 310 only in the area of the tap 420 such that the tap 420 is partially formed on the outer peripheral surface of the rock king means 400 and the area without the tap forms a smooth plane. To be combined with.

  In the present invention, the degree of compression of the elastic body 330 is changed by operating the adjustment lever 352. As the degree of compression of the elastic body 330 is increased, a greater force is required when the backrest 100 is tilted, and the backrest can be tilted more easily if the degree of compression is reduced. That is, the degree of compression of the elastic body 330 may be changed in consideration of the user's age and body characteristics.

  Meanwhile, a curved guide hole 250 is formed in the housing lid 200b constituting the housing 200, and a displacement shaft (not shown) can be connected to the displacement shaft connection hole 311 of the movable block 310 through the guide hole 250, When the backrest 100 is tilted, the backrest 100 is smoothly tilted while the displacement axis is moved along the curved guide hole 250.

  FIG. 4 shows that the backrest 100 is upright. When the user tries to tilt the backrest 100 backward, the locking king means 400 is rotated to disconnect the movable block 310. If a backward force is applied to the backrest 100, the backrest can be tilted within a predetermined angle range. After the backrest 100 is tilted to a desired angle, the lock king means 400 is rotated again to be connected to the movable block 310 so that the position can be maintained.

  FIG. 5 shows a state in which the backrest is tilted horizontally. By separating the rotary shaft 110, the backrest 100 can be completely tilted horizontally while being connected to the housing 200 through the displacement shaft. In this way, the backrest can be tilted in the horizontal direction if necessary, so that space occupation can be minimized during transportation and storage, thereby reducing costs.

(Second Embodiment)
Next, a second preferred embodiment of the present invention will be described. FIG. 10 is a side view of the main part of the chair according to the second embodiment, FIG. 11 is a side view showing a state in which the backrest is folded, FIG. 12 is an exploded perspective view of the main part, and FIG. FIG.

  The second embodiment is basically the same as the first embodiment described above, and there are differences in the specific forms of the displacement assembly and the rocking means in the components. In the second embodiment, the description of the same parts as those in the first embodiment is omitted.

  In the second embodiment of the present invention, the lock king means 400 preferably includes a lock switch 430, a lock block 440 and a support 450. As shown in the figure, the lock switch 430 is formed in a substantially “└” shape, is coupled to be rotated with respect to the housing 200, and has one end projecting outside the housing. Projecting pivot shafts 431 for pivoting operation are provided on both surfaces of the lock switch 430, and the pivot shaft 431 is rotatably supported inside the housing 200.

  A tooth profile 312 is provided on one side surface of the movable block 310, and a lock block 440 having another tooth profile 441 that meshes with the tooth profile 312 of the movable block 310 is disposed so as to face the movable block 310. . The lock block 440 is provided with a fitting groove 442 into which the other end of the lock switch 430 can be fitted, and the lock block 440 is coupled to the movable block 310 by the operation of the lock switch 430. Can also be separated.

  In addition, the lock block 440 is supported by a support body 450, and the support body 450 is like a spring, and the support body 450 is positioned between the housing 200 and the lock block 440 so that the lock block 440 is attached to the lock block 440. The state where pressure is applied to the movable block 310 side is maintained. Therefore, when it is desired to release the coupling between the movable block 310 and the lock block 440, the support body 450 is compressed and moved by rotating the lock switch 430 and moving the lock block 440 backward. The connection with the block 310 is released. However, if the force applied to the lock switch 430 is released, the support 450 acts to push the lock block 440 and be coupled to the movable block 310 while extending as it is.

As described above, the chair with adjustable backrest angle according to the present invention is configured so that the angle of the backrest can be easily adjusted, and can be applied to various chairs to provide convenience to the user. It can be applied to furniture such as a sofa that is expected to be able to be seated by a person outside of a general chair.
(Possibility of industrial use)

The present invention relates to a chair having a structure in which the angle adjustment of the backrest can be conveniently adjusted and the backrest can be completely folded. It has the advantage of being easy to stand, use chairs, store and move. Therefore, I think it needs to be widely adopted in the field of manufacturing, distribution and consumption of household and office furniture.

Claims (9)

  A chair configured to be able to change the angle of the backrest with respect to a support portion to which the backrest is connected, and a backrest provided with a rotation axis and a displacement axis on the left and right sides of the backrest; fixedly installed on the support portion A housing provided with a rotation shaft coupling hole to which the rotation shaft is coupled; a movable block formed inside the housing and coupled to the displacement shaft and capable of changing the angle of the backrest while sliding linearly A chair with adjustable backrest angle; and a locking king means capable of selectively fixing the position of the movable block.   The displacement assembly includes a movable block that moves along a slide groove inside the housing; a support shaft having one end connected to the movable block and a thread formed on the outer surface of the other end, to which the thread is fixed. A movable bar installed in a form surrounding the movable bar; an elastic body inserted into an outer surface of the movable bar; a moving gear coupled to a thread of the movable bar and forming gear teeth; and meshing with the moving gear The chair with adjustable backrest angle according to claim 1, comprising a gear portion, and an operation portion including an adjustment lever connected to the gear portion and projecting to the outside of the housing.   3. The lock king means is inserted in the vicinity of the opposite end of the adjustment lever of the operation portion and is rotated to form a rotation protrusion that protrudes to the outside of the housing. Chair with adjustable backrest angle as described in 1.   The lock king means has a tap formed in a part so as to be coupled to the movable block, and a corresponding tap is also formed on one side of the movable block facing the lock king means. The chair according to claim 3, wherein the backrest angle is adjustable.   The lock king means is bent in a “└” shape, one end protrudes to the outside of the housing, and a lock switch that can be rotated; a fitting groove that is fitted to the other end of the lock switch; The chair with adjustable backrest angle according to claim 2, further comprising: a lock block that is provided and formed with a tooth profile that meshes with the movable block; and a support that elastically supports the lock block. .   The chair according to claim 2, wherein the elastic body is one of a spring, a rubber material, and an oil / pneumatic spring.   The rotating shaft is inserted outside the housing so as to be connected to the backrest through the rotating shaft connection hole, and when the backrest is folded horizontally, the rotating shaft may be extracted outside the housing and separated. The chair with adjustable backrest angle according to any one of claims 1 to 6, wherein the chair can be adjusted.   The rotating shaft is provided with an O-ring groove to which an O-ring is coupled. When the rotating shaft is inserted through the rotating shaft connecting hole, the O-ring is compressed and then formed at an end of the rotating shaft connecting hole. The chair with adjustable backrest angle according to claim 7, wherein the chair is restored to its original state by passing through the stop protrusion to form a bond.   The elastic body is moved by the movable lever attached to the movable bar by the operation of the adjusting lever, thereby changing the degree of compression of the elastic body, thereby changing the pressure required when tilting the backrest. The chair with adjustable backrest angle according to any one of claims 2 to 6, wherein the chair can be provided.

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