Chair
A chair structure results in a proper counter force when an occupant reclines on a back. The chair is composed of a pintle, a base which is supported by the pintle, a back support which is installed on the back, a seat support which is installed on a seat, a first swaying pivot, a second swaying pivot which is located in front of the first swaying pivot, a third swaying pivot which is located between the first swaying pivot and the second swaying pivot, and a sliding structure. The chair is provided with simple structures, and can result in a constant counter force or maintain a proper counter force depending on an angle of the back, when the occupant reclines on the back.
a) Field of the Invention
The present invention relates to a chair, and more particularly to a chair which is linked to rearward tilt of a chair back, allowing a chair seat to be raised.
b) Description of the Prior Art
In spite that a chair which is linked to rearward tilt of a chair back for lowering a chair seat is more and more popular, in terms of a chair which is linked to sway of the chair back and allows a chair seat to be displaced synchronously, on the contrary, there is also a chair which is linked to the rearward tilt of the chair back for raising the chair seat.
For the chair that is linked to the rearward tilt of the chair back for raising the chair seat, there is an ergonomic chair structure disclosed in an international patent publication No. WO 00/74531. As shown in
In this chair, the force that lowers the seat 105 becomes the force for putting the back 103 upright. As a result, the weight of the occupant who sits on the seat 105 will result in the resistance against the rearward tilt of the back 103. Therefore, the heavier the occupant is, the larger the force will be needed to tilt the back 103 rearwards for resulting in the counter force, which is formed when the back 103 is tilted rearwards, to be fitted with the weight of the occupant.
However, there indeed exists following issues and shortcomings required to be improved, upon using the aforementioned chair.
For the conventional chair, when the seat 105 is raised, the support arm 108 will rotate at the center through the horizontal pivot point 110 at the underside, to change from the forward tilt condition to the upright condition, as shown by a curve C in
On the other hand, as this kind of chair uses the support arm 108 which connects the front half of the seat support 106 with the base 102, more parts are required correspondingly. In other words, the support arm 108 will become the necessary accessory, and the horizontal pivot points 110, 111 should be also installed on the support arm 108. Therefore, the parts will be increased, manufacturing cost will be increased and a more complex structure will be induced.
SUMMARY OF THE INVENTIONThe primary object of the present invention is to provide a chair which includes a pintle; a base which is supported by the aforementioned pintle; a back support which is installed on a back; a seat support which is installed on a seat; a first swaying pivot which is located on the aforementioned base to connect with the aforementioned back support; a second swaying pivot, which is located in front of the aforementioned first swaying pivot, is at a same level as that of the first swaying pivot, is displaced upwards or above the first swaying pivot, and connects the aforementioned seat support on the base in an upward or downward sway manner; a third swaying pivot, which is located between the first swaying pivot and the second swaying pivot, is displaced at a location higher than a connecting line that connects the first swaying pivot and the second swaying pivot, such that the aforementioned back is support and the seat support can be connected to sway upwards and downwards, and that the third swaying pivot can be linked with rearward tilt of the back support to raise; and a sliding structure, which is linked with rising of the aforementioned third swaying pivot, allowing the second swaying pivot to be guided along a rear upper slant direction.
Accordingly, when the back and the back support are tilted rearwards with the first swaying pivot as a center, a rear side is swayed immediately. Therefore, the third swaying pivot will be raised, and the second swaying pivot will be displaced along the rear upper slant direction, in association with the rising of the third swaying pivot. As a result, the seat support, which is supported by the second swaying pivot and the third swaying pivot, will be raised entirely. Accordingly, weight of an occupant that operates along a direction for lowering the seat support will result in a counter force against the rearward tilt of the back. Under this condition, the second swaying pivot will be guided to move along the rear upper slant direction by a function of the sliding structure. Hence, in a stage that the rearward tilt starts, the seat support will not be raised significantly and then slightly, and in an initial stage that the back is tilted rearwards, the rising of the seat support will not be enhanced quickly, thereby preventing from a condition that an extremely large counter force occurs suddenly and then diminishes, at the initial stage that the back is titled rearwards.
Another object of the present invention is that in a chair of the present invention, the sliding structure will guide the second swaying pivot along a straight line, or to be protruded out of a circular arc at an underside. As a result, when the back starts to be tilted rearwards, from the initial stage to a final stage that the back is tilted rearwards; a rising rate of the second swaying pivot will be equalized, and gradually increased following the rearward tilt of the back. At this time, if a rearward tilt angle of the back is increased by θ, and a rising distance of the second swaying pivot is assumed to be h, then the rising rate of the second swaying pivot will be h/θ. Therefore, the rising of the seat will be equalized as shown by a curve A, or be gradually increased as shown by a curve B, upon tilting the back rearwards. Accordingly, the counter force will be equalized as shown by the curve A, or be gradually increased as shown by the curve B.
Still another object of the present invention is to provide a locking structure on the base for fixing the back support. As a result, the back support can be prevented from being tilted rearwards by an operation of the locking structure, and after the operation of the locking structure has been released, the back support can be restored to a condition that it can be tilted rearwards.
Yet still another object of the present invention is to provide a locking structure which is provided with a swaying unit to fix the back support, a support arm to sway the swaying unit, and an operating structure to displace the support arm, such that under a condition that sway of the swaying unit, which is located on the support arm, is restricted, and when the operating structure is operated, an elastic deformation is formed to absorb a displacement of the swaying unit for accumulating energy, thereby swaying the swaying unit.
Accordingly, by the operation of the operating structure, the support arm will sway the swaying unit to fix the back support or to release the fixing state. In other words, after the locking structure has started to operate, the rearward tilt of the back support will be prohibited; or the back support can be tilted rearwards as the operation of the locking structure is released. When the back support is titling rearwards, the sway of the swaying unit is restricted due to the back support. Under this condition, through controlling the operating structure, an elastic deformation part which is disposed on the support arm will be deformed elastically to absorb the displacement of the swaying unit for accumulating energy, without swaying the swaying unit reluctantly. Besides, once the back support, which was titled rearwards originally, is putted upright, the swaying unit can sway. Therefore, under a condition that the elastic deformation part is restored to its original shape after being deformed elastically, the swaying unit will sway.
To enable a further understanding of the said objectives and the technological methods of the invention herein, the brief description of the drawings below is followed by the detailed description of the preferred embodiments.
Referring to
The base 2 is latched on a top of the pintle 1, and a bottom plate 2a of the base 2 is provided with a cylinder 2b, a diameter of which is gradually reduced from bottom to top. In addition, an interior of the pintle 1 is provided with a pneumatic spring 18 to adjust height, a top of this pneumatic spring 18 is protruded out of an upper end of the pintle 1, and a circumference at an upper part of the pneumatic spring 18 is a slant surface with a diameter being gradually reduced from bottom to top. As a result, the base 2 can be installed on the top of the pintle 1 by inserting the upper part of the pneumatic spring 18 into the cylinder 2b from top to bottom. Rear half parts of left and right side plates 2c, 2b of the base 2 are provided with through-holes for transfixing with the first swaying pivot 7, and front half parts are provided with through-holes for transfixing with the second swaying pivot 8. In this embodiment, the through-hole of the second swaying pivot 8 is a long hole to serve as the sliding structure 10. In addition, the long hole will be described as the sliding structure 10, hereafter.
As the seat support 6 supports the seat 5, it can freely sway and be freely installed slidingly on the base 2. The seat support 6 is constituted by an upper plate 6a above the base 2, and a pair of left and right side plates 6b, 6c that are hung down from two side edges of the upper plate 6a. These parts are formed by bending a piece of board material. In terms of the seat 5, the seat 5 is installed on the upper plate 6a by screws. In addition, the left and right side plates 6b, 6c are disposed at exterior sides of the side plates 2c, 2d of the base 2, and central positions of the left and right side plates 6b, 6c of the seat support 6 are provided with through-holes for transfixing with the third swaying pivot 9, whereas front half parts are provided with through-holes for transfixing with the second swaying pivot 8.
The back support 4 is to support the back 3, and hence, the back support 4 can be installed on the base 2 in a manner that it can sway freely. The back support 4 is constituted by the side plates 2c, 2d of the base 2, a pair of left and right side plates 4a, 4b between the side plates 6b, 6c of the seat support 6, and a support plate 4c between the left and right side plates 4a, 4b. A front half and a rear half of the support plate 4c are formed with an elevation difference, with the front half being higher, and the rear half lower. The rear half of the support plate 4c is loaded with loadings 4d at the rear halves of the left and right side plates 4a, 4b, and the loadings 4d are fixed by welding or like. By this configuration, the loadings 4d will be integrally formed with the left and right side plates 4a, 4b, as well as the support plate 4c. By welding or like, an installation plate 11 which is fixed on the back 3 is fixed on the rear half of the support plate 4c by bolts or like. The front half of the support plate 4c is extended to a level higher than that of the rear half, and is disposed above the base 2. Central positions of the left and right side plates 4a, 4b of the back support 4 are provided with through-holes for transfixing with the first swaying pivot 7, and the front halves are provided with through-holes for transfixing with the third swaying pivot 9.
The first swaying pivot 7 is transfixed into the through-holes of the base 2, and the through-holes located at the back support 4, to connect the back support 4 at the base 2, and to allow the back support 4 to be tilted rearwards. A front end of the first swaying pivot 7 is latched with a pull preventer 12. The second swaying pivot 8 is transfixed into the sliding structures 10 of the base 2, and the through-holes located at the seat support 6, to connect the base 2, such that the seat support 6 can sway upwards and downwards. A front end of the second swaying pivot 8 is latched with the pull preventer 12. The third swaying pivot 9 is transfixed into the through-holes of the seat support 6, and the through-holes located at the back support 4, to connect the seat support 6 with the back support 4, allowing the seat support 6 and the back support 4 to sway. A front end of the third swaying pivot 9 is latched with the pull preventer 12.
The sliding structure 10, such as the long through-hole extended linearly along the rear upper slant direction, is latched with push buttons 13 made by polyacetal at its peripherals, allowing the second swaying pivot 8 to smoothly slide. An angle of the sliding structure 10 is preferably toward the rear upper slant direction, for example, tilting by about 40°-70°, with the best configuration being tilting along the rear upper slant direction at about 55°. Moreover, the length of the sliding structure 10 will be 25 mm under the condition that it is tilted along the rear upper slant direction at 55°, and the second swaying pivot 8, for example, will be raised by about 20 mm.
The second swaying pivot 8 is disposed in front of the first swaying pivot 7, and is at a level higher than that of the first swaying pivot 7. The second swaying pivot 8, following the displacement of the third swaying pivot 9, is guided and displaced to the sliding structure 10, with its range of displacement being in front of the first swaying pivot 7 and above the first swaying pivot 7. However, if the second swaying pivot 8 is disposed in front of the first swaying pivot 7, and is at a same level as that of the first swaying pivot 7, then it can be also guided from this position to the sliding structure 10 along the rear upper slant direction. Besides, even under this condition, the second swaying pivot 8 will be displaced in front of the first swaying pivot 7. Moreover, the third swaying pivot 9 is disposed between the first swaying pivot 7 and the second swaying pivot 8, and is located above a connecting line L that connects the first swaying pivot 7 and the second swaying pivot 8. The third swaying pivot 9 will be displaced following with rearward tilt of the back support 4, with its range of displacement being located between the first swaying pivot 7 and the second swaying pivot 8, and above the connecting line L that connects the first swaying pivot 7 and the second swaying pivot 8.
On the other hand, when the second swaying pivot 8 is at the range below the first swaying pivot 7, no displacement will occur. As a result, the second swaying pivot 8 can be smoothly raised along with the rearward tilt of the back support 4. Assuming that the second swaying pivot 8 is disposed below the first swaying pivot 7, when the third swaying pivot 9 is above the connecting line L that connects the first swaying pivot 7 and the second swaying pivot 8, and is below the first swaying pivot 7, the third swaying pivot 9 will sway toward the rear upper slant direction with the first swaying pivot 7 as an axis, following with the rearward tilt of the back support 4. Therefore, a force of forward operation will be developed on the second swaying pivot 8, prohibiting the second swaying pivot 8 from sliding toward the rear upper slant direction, and allowing the range of displacement of the second swaying pivot 8 to be above the first swaying pivot 7 or at the same level as that of the first swaying pivot 7, so as to avoid the aforementioned condition and to enable the second swaying pivot 8 to be smoothly raised following with the rearward tilt of the back support 4.
A counter force structure 14 is disposed between the base 2 and the back support 4. By exerting a force on a top of the back support 4, the counter force structure 14 will press the back support 4 to restore to an original position when the back support 4 is tilted rearwards. Referring to
Furthermore, as the pneumatic spring 18, which is used to adjust the height, has been used very commonly, it will not be described further. The pneumatic spring 18 operates through a height adjustment structure 19. The height adjustment structure 19 in this embodiment is composed of an operating rod 20 and an installation tool 21 which is installed at the base 2 to sway the operating rod 20. The operating rod 20 includes an operating stick which is bended into a crank shape, an extension part 20a which is extended along a breadth direction of the chair for installing an operating plate 22, an shaft branch 20b which is extended toward a rear side from the extension part 20a, and an operating part 20c which is extended toward the breath direction of the chair from a front end of the shaft branch 20b. The shaft branch 20b and the operating part 20c are collected in the base 2, and the extension part 20a is protruded out of an exterior side of the base 2 from a long through-hole 2h on the right side plate 2c of the base 2. By two pieces of relieving arches 2i disposed at the base 2, and the installation tool 21 of the relieving arch 2j which is disposed between the relieving arches 2i, the shaft branch 20b can be supported and turned over. In other words, concaved locations of the two relieving arches 2i, and concaved locations of the installation tool 21 will clamp the shaft branch 20b from top to bottom, so as to constitute a bearing. The operating part 20c is stuffed into the convex part 18a of the pneumatic spring 18 to form an operable state. The long through-hole 2h of the base 2 forms a swaying shape for the operating rod 20. As shown by a solid line in
Once an occupant has reclined on the back 3, the coil spring 15 of the counter force structure 14 is compressed, and in a mean time, the back 3 and the back support 4 are tilted rearwards with the first swaying pivot 7 as a center. As a result, the third swaying pivot 9 will be raised. In addition, linkage is formed along with the rising of the third swaying pivot 9, allowing the second swaying pivot 8 to be guided to the sliding structure 10 and be displaced along the rear upper slant direction. In other words, as the second swaying pivot 8 and the third swaying pivot 9 are raised, the seat support 6 and the seat 5 are raised too. As the seat is taken by the occupant, and the weight of the occupant becomes a force to restrain the rising of the seat 5, a force that tilts the back 3 rearwards will correspondingly become a counter force.
A chair, a counter force of which as shown by a curve A or a curve B in
In the chair of this embodiment, the sliding structure 10 will guide the second swaying pivot 8 toward the rear upper slant direction in a straight line. In addition, the third swaying pivot 9 will be displaced toward the rear upper slant direction along a circumference with the first swaying pivot 7 as a center. Accordingly, a relationship between an increment θ of the rearward tilt angle of the back 3 and a rising distance h of the second swaying pivot 8 will be constant, and from the back 3 starts to be tilted rearwards, to an initial stage and to a final stage of the rearward tilt, all of the rising rates (h/θ) of the second swaying pivot 8 will be equalized. To put it another way, the positions of the first, second, third swaying pivots 7, 8, 9 and the tilt angle of the sliding structure 10 will equalize the rising rates (h/θ) of the second swaying pivot 8 when the back support 4 is tilted rearwards. Therefore, as shown by the curve A in
Referring to
On the other hand, once the occupant stops reclining on the back 3 and gets up, the coil spring 15 of the counter force structure 14 will be extended, allowing the back support 4 to be putted up forwards.
This chair is constituted through the sliding structure 10 to guide the third swaying pivot 9, allowing the chair to be composed simply, and thereby controlling an increase of manufacturing cost.
The adjustment of height of the seat 5 is disclosed hereafter. As shown by a solid line in
Once the occupant puts lifts up the operating plate 22 of the operating rod 20, the operating rod 20 will sway with the shaft branch 20b as a center, as shown by a dotted line in
A second embodiment of the present invention is described hereafter. Besides, in this detailed description and drawings, as a same part is marked by a same numeral, the repeated description will be omitted. Referring to
The turn-over unit 44 is disposed between the left side plate 2d and a wall plate 2n of the base 2, is latched into an axis 48, and cannot be turned over correspondingly. A spring 49 which can press the turn-over unit 44 toward the wall plate 2n is disposed between the side plate 2d and the turn-over unit 44. The axis 48 is supported on the side plate 2d of the base 2, and is protruded outwards from the left side plate 2d, in a manner that it can turn over freely. The operating plate 47 is installed on the protruded portion of the axis 48.
The turn-over unit 44 is provided with an arm 44a and a brake 44b. Referring to
The swaying unit 45 includes left and right side plates 45a, 45b, and a connection plate 45c that connects the two side plates 45a, 45b. The left and right side plates 45a, 45b are provided with shafts 45d, concaved parts 2p on the base 2 are inserted with the shafts 45d, a cover plate 52 is enclosed at a top and is fixed on the base 2 by screws 53. The swaying unit 45 is installed on the base 2 in a manner that it can sway with the shafts 45d as centers. An upper end of the swaying unit 45 is located in front of the shafts 45d. As a result, when the swaying unit 45 sways at a rear side, the upper end of the swaying unit 45 will be raised and latched into a concaved part 4h of the back support 4. Under this condition, the upper end of the swaying unit 45 will enter into a range of rearward tilt of the back support 4.
Referring to
On the other hand, as shown in
On the other hand, in this embodiment, a support plate 4c of the back support 4 is divided into a front half 4ca and a rear half 4cb. The front half 4ca is formed by bending a piece of board material, and the rear half 4cb is integrally formed with the left and right side plates 4a, 4b. In other words, the rear half 4cb and the side plates 4a, 4b are formed by bending the board material, and the front half 4ca is integrally fixed with the left and right side plates 4a, 4b by welding or like.
Furthermore, in this embodiment, as shown in
Seat installation parts 37, for example, are fixed by welding or like on a top of the seat support 6. The seat installation parts 37 are provided at a front and a rear place. A seat shell 38 is fixed by the seat installation parts 37, and the seat 5 is installed on the seat support 6 with screws, for example. Moreover, on the seat support 6 is provided with armrest installation parts 39 to install the armrests which are fixed by welding or like. Besides, as seen by the chair of this embodiment, the armrests do not need to be installed even there are the armrest installation parts 39.
Even that the chair of this embodiment is the same as that in
On the other hand, the aforementioned embodiment is only one of the proper embodiments of the present invention, and is not the necessary embodiment of the present invention. As long as they will not deviate from the features of the present invention, all kinds of variations can be available within the range.
For example, in the aforementioned description, although the sliding structure 10 guides the second swaying pivot 8 along a straight line, it can also guide non-linearly. As shown in
Furthermore, in the aforementioned description, if the counter force structure 14 cannot adjust the intensity of the resulted counter force, then it is still acceptable as long as that the intensity of the resulted counter force is adjustable. Referring to
Moreover, the locking structure 23 can be also a type which is provided with a spring part in a mechanism and keeps its own functions. Referring to
In this embodiment, the turn-over unit 44 of the operating structure is disposed between the left side plate 2d and the wall plate 2n of the base 2, and is latched into the axis 48 to prohibit from being turned over. In other words, by inserting the convex part 48a which is located at the axis 48 into the concaved part 44d which is located at the through-hole 44c of the turn-over unit 44, the turn-over unit 44 will be latched into the axis 48 without being turned over. A fixing part 57 is located between the turn-over unit 44 and the bottom plate 2a of the base 2, and is formed by an elastic material, such as resin, which enables the convex part 57d between the concaved parts 57a, 57b to be pressed down by installing the through-hole 57c, to latch the convex part 44e at a bottom of the turn-over unit 44 into the concaved part 57a or 57b of the fixing part 57. In this manner, the turn-over unit 44 will be fixed at the initial position, as shown in
The arm 44a is disposed on the top of the turn-over unit 44. The support arm 46 is connected at the place close to the front end of the arm 44a in a manner that the support arm 46 can sway. The other end of the support arm 46 is connected at the side plate 45b of the swaying unit 45, in a manner that the support arm 46 can sway.
The axis 48 is inserted into the through-hole 58 on the side plate 2d of the base 2, and the through-hole 61 on the wall plate 2n, such that an inner end of the axis 48 can be supported by a wall plate 2w and the operating rod 20 with the installation tool 21 which can sway, in a manner that the axis 48 can be turned over freely. The axis 48 is provided with a convex part 48b, and the convex part 48b is inserted into the concaved part 58a of the through-hole 58 of the side plate 2d, so as to allow the axis 48 to be turned over by an angle, and to allow the convex part 48b to move from a side of the concaved part 58a to the other side. In other words, the turn-over unit 44 will be restricted from being turned over to the locking position (as shown in
As shown in
The operating handle 60 is fixed at an exterior end of the axis 48. Holding the operating handle 60 and turning it over, can turn over the turn-over unit 44. However, if the operating handle 60 is changed into the operating rod (not shown in the drawings) that is installed at the axis 48, then the turn-over unit 44 can be operated by the operating rod.
In this embodiment, a top of the back support 4 is provided with a convex part 4i, allowing the swaying unit 45 to be located outside the swaying range under a condition that the back support 4 is not tilted rearwards, and to the swaying unit 45 will be located outside the swaying range, and enter into the swaying range once the back support 4 is tilted rearwards.
Referring to
On the other hand, as shown in
When the turn-over unit 44 is at the initial position, the swaying unit 45 is pulled back to the front, as shown by the arrow T in
Moreover, when the back 3 is locked by using the locking structure 23 (as shown by a state in
Furthermore, referring to
Moreover, referring to
Moreover, referring to
Moreover, referring to
The present invention is provided with following advantages:
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- 1. At the stage that the back starts to be tilted, the operation that the seat rises significantly and then rises slightly can be prevented. As a result, the condition that the back is easy to be tilted by the quick weakening of the counter force after the back is tilted from a certain extent can be avoided, thereby improving the comfortableness in using the chair. Besides, by using the sliding structure to guide the third swaying pivot, the chair can be constructed simply to reduce the manufacturing cost.
- 2. The sliding structure guides the second swaying pivot in a straight line or to be protruded out of the circular arc at the underside. As a result, at the moment that the back is tilted rearwards, the rising of the seat will be equalized as shown by the curve A in
FIG. 27 , or be enlarged gradually as shown by the curve B inFIG. 27 . As a result, almost the equalized counter force can be acquired disregarding the rearward tilt angle as shown by the curve A inFIG. 28 . On the other hand, as shown by the curve B inFIG. 28 , when the rearward tilt angle of the back increases, the counter force can be changed. Therefore, when the occupant reclines on the back to tilt the back rearwards, a constant counter force can be maintained, or a proper counter force can be maintained depending on the angle of the back, thereby improving the comfortableness while being seated. - 3. The chair of the present invention is provided with the elastic deformation part that absorbs the relative displacement between the operating structure and the swaying unit to accumulate as energy. As a result, when the sway of the swaying unit is restricted, the swaying unit will not sway reluctantly, thereby preventing the structures from being damaged. In addition, even that the swaying unit cannot sway; the operation can be still conducted through the operating structure. Under the condition that the swaying unit cannot sway, the operating structure is controlled and when the swaying unit can sway, it will sway automatically. Therefore, the operation of the operating structure can be conducted without needing to care whether the back is tilted rearwards, and the chair can be used more freely.
It is of course to be understood that the embodiments described herein is merely illustrative of the principles of the invention and that a wide variety of modifications thereto may be effected by persons skilled in the art without departing from the spirit and scope of the invention as set forth in the following claims.
Claims
1. A chair comprising a pintle; a base, which is supported by the pintle; a back support, which is installed on a back; a seat support, which is installed on a seat; a first swaying pivot, which is located on the base, and is connected with the back support in a manner that the back support is tilted rearwards; a second swaying pivot, which is located in front of the first swaying pivot, is at a same level as that of the first swaying pivot, is displaced upwards or above the first swaying pivot, and connects the seat support to the base in a manner that the seat support is tilted upwards and downwards; a third swaying pivot, which is located between the first swaying pivot and the second swaying pivot, is displaced at a level higher than that of a connecting line that connects the first swaying pivot and the second swaying pivot, so as to connect the back support with the seat support to be tilted upwards and downwards, and to be linked with rearward tilt of the back support such that the third swaying pivot raises with the back support; and a sliding structure, which is linked with rising of the third swaying pivot, allowing the second swaying pivot to be guided along a rear upper slant direction.
2. The chair according to claim 1, wherein the sliding structure guides the second tilting structure in a straight line, or to be protruded out of an arc at an underside.
3. The chair according to claim 1, wherein the base is provided with a locking structure to fix the back support.
4. The chair according to claim 2, wherein the base is provided with a locking structure to fix the back support.
5. The chair according to claim 3, wherein the locking structure is provided with a swaying unit to fix the back support, a support arm to sway the swaying unit, and an operating structure to displace the support arm; on the support arm, and under a condition that sway of the swaying unit is restricted, when the operating structure being operated, and an elastic deformation being formed to absorb a displacement of the sway of the swaying unit for accumulating energy, thereby enabling the swaying unit to sway.
6. The chair according to claim 4, wherein the locking structure is provided with a swaying unit to fix the back support, a support arm to sway the swaying unit, and an operating structure to displace the support arm; on the support arm, and under a condition that sway of the swaying unit is restricted, when the operating structure being operated, and an elastic deformation being formed to absorb a displacement of the sway of the swaying unit for accumulating energy, thereby enabling the swaying unit to sway.
Type: Application
Filed: Dec 31, 2007
Publication Date: Mar 31, 2011
Inventor: Isao Okamoto (Taishan Township)
Application Number: 12/003,791
International Classification: A47C 1/032 (20060101);