Weight-responsive pivoting chairs are used to control tilting of a seat and back assembly for the chair in order to increase comfort for the user. In some chair assemblies, the chair back reclines, while the chair seat remains horizontal. In other chair assemblies, the chair back and the chair seat are able to move in sync with each other. Most pivoting chairs utilize complex mechanisms located under the seat to control the movement of the chair back and the chair seat. These designs result in a chair assembly that is expensive to manufacture. In addition, the complex mechanisms reduce the ability to stack and conveniently store the chair assemblies.
As such, there is a need in the art for a chair assembly having an improved weight-activated pivoting system with multiple pivot points and a biasing element extending between the seat and the legs of the chair assembly. Additionally, there is a need in the art for an improved pivoting chair assembly that is also easily stackable.
The invention is related to a chair assembly, and, in particular, to a chair assembly that is configured to be stackable yet provide a degree of recline of a back portion relative to a seat portion during use of the same.
In accordance with one aspect of the application, a chair assembly includes a leg support having a plurality of legs and a crossbar that extends between the plurality of legs. A back is rotatably coupled to the leg support via a first pivot and a seat is rotatably coupled to the back via a second pivot. A biasing element extends from the leg support to a lower portion of the seat and includes a plurality of base portions that are coupled to the leg assembly. The biasing element includes a lower bend section that transitions to an extension portion and an upper bend section that transitions each extension portion to a raised portion that is aligned with a lower portion of the seat. The upper bend provides a third pivot and the lower bend provides a fourth pivot that are activated when the back reclines relative to the seat.
According to another aspect of the application, a force applied to the back causes the back to pivot about the first pivot, the back and seat to pivot about the second pivot, the seat and biasing element to pivot about the third pivot point, and the biasing element to pivot about the fourth pivot point.
In accordance with another aspect of the invention, a chair assembly includes a leg assembly with a plurality of legs and a support member extending inward from at least two of the legs. A back is rotatably coupled to the leg assembly via a first pivot axis, and a seat is rotatably coupled to the back via a second pivot axis. A biasing element extends between the leg assembly to the seat. The biasing element includes a raised portion extending horizontally under the seat and a plurality of upper bend portions that transitions the raised portion to a plurality of extension portions. Each extension portion extends from a respective upper bend section to a location adjacent a respective support member. The upper bend portions provide a third pivot axis, while the location adjacent the support member provides a fourth pivot axis.
According to yet another aspect of the invention, the biasing element may also include a lower bend portion that transitions each extension portion to a base portion. In turn, each base portion is coupled to an inner surface of a respective leg. In this aspect of the invention, the fourth pivot axis is defined by the lower bend portions. Further, the support member may be a crossbar extending between at least two of the legs or a plurality of protrusions extending inward from at least two of the legs.
According to another aspect of the invention, a crossbeam extends between at least two of the legs at a location adjacent a top end of each leg, and a support is coupled to the crossbeam. A channel is formed in the lower surface of the seat, and a distal end of the support extends into the channel. A flex member is coupled to and extends between the distal end of the support and an inner edge of the channel. As a result, pivoting of the chair assembly about the first, second, third, and fourth pivot axes causes the flex member to expand as the distal end of the support and the inner edge of the channel are displaced and causes the flex member to contract as the distal end of the support and the inner edge of the channel are brought closer together.
In accordance with yet another aspect of the invention, a chair assembly includes a plurality of legs and a support member extending inward from at least one leg. A back is rotatably coupled to the leg assembly to provide a first pivot axis. A seat is rotatably coupled to the back to provide a second pivot axis. Further, a biasing element extends from the seat at a third pivot axis to a location adjacent the support member at a fourth pivot axis.
These and other aspects and objects of the present invention will be better appreciated and understood when considered in conjunction with the following description and the accompanying drawings. It should be understood, however, that the following description, while indicating preferred embodiments of the present invention, is given by way of illustration and not of limitation. Many changes and modifications may be made within the scope of the present invention without departing from the spirit thereof, and the invention includes all such modifications.
A clear conception of the advantages and features constituting the present invention will become more readily apparent by referring to the exemplary, and therefore non-limiting, embodiments illustrated in the drawings accompanying and forming a part of this specification, wherein like reference numerals designate the same elements in the several views.
In the drawings:
The present invention and the various features and advantageous details thereof are explained more fully with reference to the non-limiting embodiments described in detail in the following description.
As shown in
The biasing element 18 extends from an inner surface 34 of each leg 20 to a front portion 36 of the seat 14. For example, the biasing element 18 may be a tension bar. In the representative embodiment of the invention, the biasing element 18 is coupled to the inner surface 34 of each leg 20 adjacent the first end 26 of the base portion 24 of the leg 20a. Alternatively, it is appreciated that biasing element 18 may cooperate with an outer lateral surface of each leg 20. The biasing element 18 includes a base section or portion 38 extending from each leg 20 toward the crossbar 22, so as to rest upon or be spaced apart from a top surface 40 of the crossbar 22 adjacent the base portion 24 of the respective leg 20. At a lower bend section or portion 42 adjacent the crossbar 22, the biasing element 18 then transitions to an extension section or portion 44 extending upward from each base portion 38 and toward the front portion 36 of the seat 14. The base and extension portions 38, 44 of the biasing element 18 are oriented generally along a vertical plane although it is appreciated that the extension portions 38, 44 of biasing element 18 may have a canted or crossing orientation relative to a gravitationally vertical orientation. At an upper bend section or portion 48 adjacent the seat 14, the biasing element 18 then transitions to a raised section or portion 50 that extends preferably in a perpendicular orientation relative to the extension portions 44 and along a lower surface 46 of the seat 14 at the front portion 36 of the seat 14. The raised portion 50 of the biasing element 18 is preferably oriented along a horizontal plane that extends under the seat 14.
As stated above, the biasing element 18 includes a base section or portion 38, a lower bend section or portion 42, an extension section or portion 44, and an upper bend section or portion 48 associated with each leg 20. Each extension portion 44 transitions to the raised portion 50 of the biasing element 18 at its respective upper bend portion 48. That is, the raised portion 50 extends between the upper bend portions 48. For example, in the representative embodiment of the invention shown in
Regardless of the specific construction methodology employed, in one embodiment of the invention, the biasing element 18 includes two (2) base portions 38, two (2) lower bend sections or portions 42, two (2) extension sections or portions 44, two (2) upper bend sections or portions 48, and one (1) raised section or portion 50. In other embodiments of the invention, the biasing element 18 may include other numbers of base portions 38, other numbers of lower bend sections or portions 42, other numbers of extension sections or portions 44, other numbers of upper bend sections or portions 48, and other numbers of raised section(s) or portion(s) 50. In yet another alternative embodiment of the invention, the biasing element 18 may include a raised portion 50, upper bend sections 48, and extensions portions 44. In such an embodiment of the invention, the extension portions 44 may be directly coupled to the crossbar 22. Details of such alternate embodiments are disclosed further below with respect to
As shown in
As shown in
Pivot joints 56 facilitate translation of motion of the back 16 into corresponding motion of the seat 14 to transfer the chair assembly from the at-rest or unloaded orientation 52—as shown in
The back 16 may also be rotatably coupled to each leg support 12 via a pivot or pivot joint 62. Each pivot joint 62 is preferably disposed at a location 64 on an outer surface 66 of each leg 20. Preferably, discrete pivot joints 62 are coaxial with one another along a pivot axis 84. In the representative embodiment of the invention, the back 16 includes an extension member 68 that extends from each side 70 of the back 16 to the location 64 on the outer surface 66 of the leg portion 30 of a respective leg 20. In the representative embodiment of the invention, location 64 is adjacent a top end 72 of the leg portion 30 however it is appreciated that location 64 may be disposed at any point along the length of the leg portion 30 of the leg 20. The multiple pivotable connections between back 16 and legs 20, back 16 and seat 36, and seat 36 and legs 20 allows the back 16 and seat 36 of the chair assembly 10 to rotate between the upright position 52 shown in
Referring to
The flex member 17 includes a first end 19 coupled to the inner end of the channel 13 and a second end 21 coupled to the first end 73 of the support extension. As shown in
As stated above, the flex member 17 variably spaces the first end 73 of the support extension 74 from the inner end 13 of the channel 15. In other words, the flex member 17 is configured to expand as the first end 73 of the support extension 74 moves further away from the inner end 13 of the channel 15, while being configured to compress as the first end 73 of the support extension 74 moves closer to the inner end 13 of the channel 15.
As shown in
Pivot joints 62, 56 provide a first pivot, pivot axis, or pivot point 84 and a second pivot, pivot axis, or pivot point 86, respectively for the chair assembly 10. A third pivot, pivot axis, or pivot point 88 and a fourth pivot, pivot axis, or pivot point 90 are provided along the biasing element 18. The third pivot point 88 is disposed at the upper bends 48 of the biasing element 18. The fourth pivot point 90 is disposed at the lower bends 42 of the biasing element 18. Although shown from the right hand side of chair assembly 10 relative to a user seated thereupon, it should be appreciated that the left and right hand lateral sides of seat assembly 10 are generally mirror images of one another such that each lateral side of chair assembly 10 includes respective first, second, third, and fourth pivots whose axes of rotation are coaxially aligned with one another, respectively.
When a user attempts to transition the chair assembly 10 from the upright position 52 to the reclined position 60, the back 16 rotates about the pivot joints 62 in a first direction. That is, the back 16 of the chair assembly 16 rotates relative to the respective leg portions 30 about the axis associated with the first pivot point 84.
In turn, the pivot joints 56 disposed at the lower portion 58 of the back 16 also move about the pivot joint 62. As a result of the movement described above, the rear portion 54 of the seat 14 of the chair assembly 10 is raised to accommodate the movement of the pivot joints 56. That is, rotation of the back 16 about the first pivot point 84 causes movement of the second pivot point 86, resulting in movement of the seat 14 in relation to the second pivot point 86.
Due to the movement of the seat 14 coinciding with the second pivot point 86, the front portion 36 of the seat 14 moves about the third pivot point 88. Likewise, movement of the front portion 36 of the seat 14 about the third pivot point 88 causes movement of the biasing element 18 itself about the fourth pivot point 90. The pivoting about the third and fourth pivot points 88, 90 causes increased tension in the biasing element 18 between the respective upwardly oriented and lower oriented respective portions thereof.
As shown by comparing
In addition, movement of the seat 14 coinciding with the axis of rotation associated with the second pivot point 86 and the third pivot point 88, allows the first end 73 of the support extension 74 to transition in a direction away from the inner end 13 of the channel 15 which translation is accommodated by expansion of the flex member 17.
When in the reclined position 60, the biasing element 18 has increased tension due to the movement of elements about the pivot points. As a result, the chair assembly transitions itself toward the at-rest or upright position 52—as shown in
As discussed above,
Chair assembly 10 is constructed to be stackable in a manner customary to similarly constructed chair assemblies yet also constructed to provide a reclined orientation of the back relative to the seat portion of the assembly and in a manner that allows the seat of the chair assembly, and preferably a forward edge thereof, to translate in a somewhat upward and forward direction relative to the back of the chair assembly and so as to provide support for the back of the legs of users seated thereupon to achieve a more comfortable and ergonomic configuration of the chair assembly with respect to a seated and reclined user.
As shown in
The seat support 14b forms the lower portion of the seat 14 and the lower surface 46 of the seat 14. The seat support 14b provides additional rigidity or support for the seat 14 and also provides the channel 15 formed therein associated with receiving flex member 17 disposed within the channel 15 as disclosed above. As shown in
Similarly, the back 16 may also be either of a unitary or a multi-part assembly including a back rest 16a and a back support 16b. While
The back support 16b forms the outer portion of the back 16. In the representative embodiment of the invention, the back support 16b extends along the back rest 16a from pivot joints 56, 62 to a location approaching the mid-point of the back 16. In varying embodiments of the invention, the back support 16b may extend along any portion of the back rest 16a or discrete portions of the perimeter associated therewith. For example, it is contemplated that the back support 16b may extend to a top edge 102 of the back 16.
Referring to
As shown in
Referring next to
As previously described, each leg 20 includes base portion 24 with first and second ends 26, 28. The biasing element 118 extends from an inner surface 34 of each leg 20 to a front portion 26 of the seat 14. As shown in
Pivot points or axes 188, 190 coincide with previously discussed third and fourth pivot points or axes 88, 90, respectively. That is, pivot point 188 is disposed at the upper bend portion 148 of the biasing element 118, and pivot point 190 is disposed at the lower bend portion 142 of the biasing element 118.
As shown in
In this embodiment of the invention, pivot points or axes 288, 290 replace third and fourth pivot points or axes 88, 90, respectfully, discussed with respect to
In the representative embodiment of
As shown in
In the representative embodiment of the invention, the biasing element 318 includes extension portions 344a, 344b and upper bend portions 348a, 348b associated with each leg 20a, 20b. As such, the biasing element 318 of
It should be understood that the above description, while indicating representative embodiments of the present invention, is given by way of illustration and not of limitation. Many changes and modifications may be made within the scope of the present invention without departing from the spirit thereof, and the invention includes all such modifications. Various additions, modifications, and rearrangements are contemplated as being within the scope of the following claims, which particularly point out and distinctly claim the subject matter regarding as the invention, and it is intended that the following claims cover all such additions, modifications, and rearrangements.
This application claims priority to PCT Application No. PCT/US2019/018171, filed on Feb. 15, 2019, which claims priority to U.S. Provisional Application No. 62/631,580, filed on Feb. 16, 2018. The entire contents of each are hereby expressly incorporated by reference into this application.
Filing Document | Filing Date | Country | Kind |
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PCT/US2019/018171 | 2/15/2019 | WO | 00 |
Publishing Document | Publishing Date | Country | Kind |
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WO2019/161168 | 8/22/2019 | WO | A |
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