Chair manufacturers continually strive to improve the comfort, benefits, aesthetics, manufacturability, and utility of the chairs they produce. Some chairs have features, such as armrests and a reclining back, for comfort and support. Some chairs have features, such as folding seats, to occupy less space. Folding seats can be used in office or residential settings, on buses to make room for equipment, such as wheelchairs or bicycles, in cars to provide extra seating, and in stadiums and auditoriums to facilitate ingress and egress from the seating area, for example.
Some embodiments described in this disclosure relate to a chair that includes a first side member, a second side member, a back cross member, a first flex member, and a second flex member. The first side member supports a first side of the chair on a surface and the second side member supports a second side of the chair on the surface. The back cross member is situated between the first side member and the second side member and rotates relative to the first side member and the second side member. The first flex member is coupled to the first side member and the back cross member, and the first flex member twists as the back cross member rotates relative to the first side member and the second side member. The second flex member is coupled to the second side member and the back cross member, and the second flex member twists as the back cross member rotates relative to the first side member and the second side member.
Some embodiments relate to a chair where the first flex member is a first torsion spring that twists as the back cross member rotates relative to the first side member and the second side member and the second flex member is a second torsion spring that twists as the back cross member rotates relative to the first side member and the second side member.
Some embodiments relate to a chair where the back cross member has a cross member longitudinal axis and the back cross member rotates relative to the first side member and the second side member around the cross member longitudinal axis. Some embodiments relate to a chair where the first flex member has a flex member longitudinal axis that is parallel with the cross member longitudinal axis and the first flex member twists around the flex member longitudinal axis as the back cross member rotates around the cross member longitudinal axis.
Some embodiments described in this disclosure relate to a chair that includes a first side member, a second side member, a back cross member, a first flex member, and a second flex member. The first side member supports a first side of the chair on a surface and the second side member supports a second side of the chair on the surface. The back cross member is situated between the first side member and the second side member and the back cross member rotates relative to the first side member and the second side member. The first flex member is secured to the first side member with at least one first fastener and the first flex member twists as the back cross member rotates relative to the first side member and the second side member. The second flex member is secured to the second side member with at least one second fastener and the second flex member twists as the back cross member rotates relative to the first side member and the second side member. The back cross member rotates and the at least one first fastener provides a first stop against the back cross member and the at least one second fastener provides a second stop against the back cross member to substantially prevent further rotation of the back cross member.
Some embodiments relate to a method of making a chair, which includes: fastening a first flex member to a first side member; fastening a second flex member to a second side member; and securing a chair back to a back cross member. Where securing the chair back to the back cross member couples the chair back to the first flex member and the second flex member. Some embodiments relate to a method that includes fitting a first portion of the first flex member into the first side member prior to fastening the first flex member to the first side member. Some embodiments relate to a method that includes fitting a second portion of the first flex member into the back cross member prior to securing the chair back to the back cross member.
Some embodiments described in this disclosure relate to a chair that includes a base, a seat maintained by the base, a chair back, and a chair back flex assembly. The base is configured to support the chair on a surface and has a first side and a second side. The chair back has a reclined position and an upright position and the chair back flex assembly couples the chair back to the base. The chair back flex assembly includes a back cross member and a first flex member. The back cross member has a first end and a second end and a longitudinal axis and the first flex member is coupled to the back cross member at the first end of the back cross member such that the first flex member elastically deflects to permit rotation of the back cross member about the longitudinal axis of the back cross member as the chair back is moved from the upright position to the reclined position. Some embodiments relate to a chair including a second flex member coupled to the back cross member at the second end of the back cross member such that the second flex member elastically deflects to permit rotation of the back cross member about the longitudinal axis of the back cross member as the chair back is moved from the upright position to the reclined position.
While multiple embodiments are disclosed, still other embodiments of the present invention will become apparent to those skilled in the art from the following detailed description, which shows and describes illustrative embodiments of the invention. Accordingly, the drawings and detailed description are to be regarded as illustrative in nature and not restrictive.
The first side member 48 includes a first front leg 56 and a first back leg 58 and the second side member 52 includes a second front leg 60 and a second back leg 62. The first front leg 56 has a rounded curve shape and is coupled at one end to the first back leg 58 and curves forward toward the surface at the front of the chair 40. The first back leg 58 has a slightly rounded curve shape and is coupled to the one end of the first front leg 56 and curves from the coupling toward the surface at the back of the chair 40. The second front leg 60 has a rounded curve shape and is coupled at one end to the second back leg 62 and curves forward toward the surface at the front of the chair 40. The second back leg 62 has a slightly rounded curve shape and is coupled to the one end of the second front leg 60 and curves from the coupling toward the surface at the back of the chair 40.
Each of the legs 56, 58, 60, and 62 is attached to a corresponding wheel or caster 64, 66, 68, and 70 near the surface. The wheels or casters 64, 66, 68, and 70 roll on the surface, such that the chair 40 can be rolled from one place to another place on the surface. In some embodiments, each of the legs 56, 58, 60, and 62 includes a leg stub or cover at the surface to maintain the chair 40 in one place after it has been placed in position on the surface.
The seat 46 is coupled to the first side member 48 and the second side member 52 via a seat support assembly 72 (shown in
The chair 40 includes the chair back 42 coupled to the base 44 by the chair back flex assembly 74. The chair back 42 includes a chair back frame 82 and back support material 84. The chair back frame 82 is a rigid frame that includes a lower crossbar member 86, two upright members 88 and 90 that extend vertically from the lower crossbar member 86, and an upper crossbar member 92 that connects the two upright members 88 and 90 at the top of the chair back 42. The back support material 84 is attached to the chair back frame 82, including the lower crossbar member 86, the two upright members 88 and 90, and the upper crossbar member 92, to support the back of the user. In some embodiments, the chair back frame 82 is made from a rigid material, such as plastic or metal. In some embodiments, the chair back frame 82 is not a closed curve shape. In some embodiments, the chair back frame 82 is a different shape having one or two upright frame members attached to a lower crossbar member, but without an upper crossbar member.
The chair back flex assembly 74 includes a back cross member 94, a first flex member 96, and a second flex member 98. The back cross member 94 includes a first end 100, a second end 102, and a cross member longitudinal axis 104. The first flex member 96 is coupled to the back cross member 94 at the first end 100 and the second flex member 98 is coupled to the back cross member 94 at the second end 102. Also, the first flex member 96 is coupled to the first leg extension 76 of the first side member 48 and the second flex member 98 is coupled to the second leg extension 78 of the second side member 52, such that the back cross member 94 is situated between the first side member 48 and the second side member 52.
The chair back 42 is coupled to the chair back flex assembly 74 by the lower crossbar member 86, and the chair back flex assembly 74 couples the chair back 42 to the first side member 48 and the second side member 52 of the base 42. The lower crossbar member 86 of the chair back frame 82 is coupled to the back cross member 94 and to each of the first and second flex members 96 and 98 of the chair back flex assembly 74. The back cross member 94 fits into a slot in the lower crossbar member 86, such that the lower crossbar member 86 fits around the back cross member 94. As seen from the front of the chair 40, the lower crossbar member 86 covers the front of the back cross member 94 and front portions of the first and second flex members 96 and 98. As seen from the back of the chair 40, the lower crossbar member 86 leaves the back of the back cross member 94 and back portions of the first and second flex members 96 and 98 uncovered, where a bottom portion 86a of the lower crossbar member 86 extends below the back cross member 94 and an upper portion 86b of the lower crossbar member 86 extends above the back cross member 94. The bottom portion 86a of the lower crossbar member 86 includes four connection blocks 106a-106d. Attachment members (not shown in
In operation, the chair back 42 is moved between the upright position and the reclined position, such that the top 108 of the chair back 42 moves backward and forward and the back cross member 94 rotates around or about the cross member longitudinal axis 104. The first flex member 96 and the second flex member 98 twist as the back cross member 94 rotates relative to the stationary first and second side members 48 and 52. In some embodiments, the top 108 of the chair back 42 moves between 0.5 and 4 inches. In some embodiments, the top 108 of the chair back 42 moves between 1.5 and 2 inches. In some embodiments, the flex members 96 and 98 twist or rotate between 0.125 and 0.25 inches. In some embodiments, less than 5 pounds of force on the chair back 42 causes the chair back 42 to flex backward.
The first flex member 96 and the second flex member 98 elastically deflect to permit rotation of the back cross member 94 about the cross member longitudinal axis 104 as the chair back 42 moves between the upright position and the reclined position. In one aspect, the first flex member 96 is a first torsion spring that twists as the back cross member 94 rotates relative to the first side member 48 and the second side member 52, and the second flex member 98 is a second torsion spring that twists as the back cross member 94 rotates relative to the first side member 48 and the second side member 52. The first flex member 96 and the second flex member 98 cause the chair back 42 to return to the upright position from the reclined position. In some embodiments, the first flex member 96 has a flex member longitudinal axis that is parallel with the cross member longitudinal axis 104 and the first flex member 96 twists or rotates around the flex member longitudinal axis as the back cross member 94 rotates around the cross member longitudinal axis 104. In some embodiments, the second flex member 98 has a flex member longitudinal axis that is parallel with the cross member longitudinal axis 104 and the second flex member 98 twists or rotates around the flex member longitudinal axis as the back cross member 94 rotates around the cross member longitudinal axis 104.
The chair back 42 includes the chair back frame 82 and the back support material 84. The back support material 84 is attached to the chair back frame 82, including the lower crossbar member 86, the two upright members 88 and 90, and the upper crossbar member 92. As illustrated in
The chair back flex assembly 74 includes the back cross member 94 attached to the first flex member 96. The back cross member 94 is fit against the lower crossbar member 86 of the chair back frame 82, with an alignment stub 126 of the lower crossbar member 86 inserted into an alignment hole 128 of the back cross member 94. Also, the first end 100 of the back cross member 94 receives a cross member portion 96a (also shown in
To couple the chair back 42 to the chair back flex assembly 74 on the first side 50, a first attachment member 130a is inserted through the upper portion 86b (shown in
To attach the chair back flex assembly 74 to the first side member 48 of the chair 40, an extension portion 96b (also shown in
The first flex member 96 includes the cross member portion 96a, the extension portion 96b, and a middle portion 96c that is between the cross member portion 96a and the extension portion 96b. The outer perimeter of the middle portion 96c is larger than the outer perimeter of the cross member portion 96a, and the outer perimeter of the middle portion 96c is larger than the outer perimeter of the extension portion 96b. As a result, after the cross member portion 96a is inserted into the first end 100 of the back cross member 94 and the extension portion 96b is inserted into the first leg extension 76, the outer perimeter of the middle portion 96c is flush with the back cross member 94 and the first leg extension 76. Also, the middle portion 96c is visible between the back cross member 94 and the first leg extension 76 and, in the completed chair 40, visible from the back 122 of the chair 40.
The cross member portion 96a includes a through hole 140 that extends from the top 142 of the first flex member 96 through the bottom 144 of the first flex member 96. The attachment member 130a is inserted through this hole 140 to couple the chair back 42 to the back cross member 94 and the first flex member 96. The cross member portion 96a also includes two longitudinal slots 146a and 146b in the front of the first flex member 96. The longitudinal slots 146a and 146b extend longitudinally from one side 148 of the first flex member 96 to indentations 150a and 150b in the middle portion 96c. The longitudinal slots 146a and 146b are for receiving fasteners, such as bolts, that are slid into the middle portion 96c and the extension portion 96b and secured to the first leg extension 76.
The middle portion 96c and the extension portion 96b include two longitudinal through holes 152a and 152b that extend from the middle portion 96c through the other side 154 of the first flex member 96. These two holes 152a and 152b receive the fasteners that are inserted through the middle portion 96c and the extension portion 96b and secured to the first leg extension 76 to secure the first flex member 96 to the first side member 48. The heads of the fasteners, such as the heads of bolts, are situated in the longitudinal slots 146a and 146b of the cross member portion 96a to hold the first flex member 96 tightly to the first leg extension 76.
The first flex member 96 is a torsion spring that twists around or about a flex member longitudinal axis 156 as the chair back 42 flexes backward. In one aspect, the first flex member 96 is a torsion bar that twists as the back cross member 94 rotates relative to the first side member 48 and the second side member 52. The flex member longitudinal axis is parallel with the longitudinal axes of the fasteners that connect the first flex member 96 to the first leg extension 76. In some embodiments, the flex member longitudinal axis 156 is parallel with the cross member longitudinal axis 104 and the first flex member 96 twists around the flex member longitudinal axis 154 as the back cross member 94 rotates around the cross member longitudinal axis 104.
In some embodiments, the first flex member 96 is formed of a substantially solid block of elastomeric material. In some embodiments, the first flex member 96 is made of at least one of rubber, urethane, and polyurethane. In some embodiments, the first flex member 96 is formed of a material having a durometer of 95 Shore A.
The first side member 48 includes the first front leg 56 and the first back leg 58 connected to the first leg extension 76. The extension portion 96b of the first flex member 96 is inserted into the first leg extension 76 and fasteners (not shown in
The chair back flex assembly 74 includes the first flex member 96, the second flex member 98, and the back cross member 94. The cross member portion 96a of the first flex member 96 is inserted into the first end 100 of the back cross member 94 and the through hole 140 in the cross member portion 96a is aligned with top and bottom holes in the back cross member 94, such as top hole 162. After the first flex member 96 has been inserted into the first leg extension 76 and the back cross member 94, the middle portion 96c is visible between the back cross member 94 and the first leg extension 76. Also, the outer perimeter of the middle portion 96c is flush with the back cross member 94 and the first leg extension 76.
The attachment member 130a (shown in
The first side member 48 includes the first front leg 56 and the first back leg 58 connected to the first leg extension 76. The extension portion 96b of the first flex member 96 is inserted into the first leg extension 76 and fasteners (not shown in
The cross member portion 96a of the first flex member 96 is inserted into the first end 100 of the back cross member 94. The through hole 140 in the cross member portion 96a is aligned with a hole in the upper portion 86b of the chair back frame 82 and the top hole 162 and the bottom hole in the back cross member 94. After the first flex member 96 has been inserted into the first leg extension 76 and into the back cross member 94, the middle portion 96c is visible between the back cross member 94 and the first leg extension 76. Also, the outer perimeter of the middle portion 96c is flush with the back cross member 94 and the first leg extension 76.
The attachment member 130a (shown in
The back cross member 94 is a rectangular hollow tube that fits into a slot 166 in the lower crossbar member 86 of the chair back frame 82. The slot 166 is at least partially defined by the bottom portion 86a and the upper portion 86b of the lower crossbar member 86. The bottom portion 86a of the lower crossbar member 86 extends below the back cross member 94 and the upper portion 86b of the lower crossbar member 86 extends above the back cross member 94. The back support material 84 of the chair 40 is attached to the lower crossbar member 86 in front of the back cross member 94.
As shown in
In operation, the chair back 42 is flexed from the upright position to the reclined position, such that the top 108 of the chair back 42 moves backward and the back cross member 94 rotates around or about the cross member longitudinal axis 104. The first flex member 96 twists as the back cross member 94 rotates relative to the stationary first side member 48. To help prevent further backward movement of the chair back 42 and to help prevent further rotation of the first cross member 94, the fastener 164a engages the back cross member 94 toward the front 120 of the chair 40 and the back cross member 94, knocking against the back cross member 94 to stop rotation of the back cross member 94 and backward movement of the chair back 42.
Also, if the chair back 42 is flexed forward, such that the top 108 of the chair back 42 moves forward and the back cross member 94 rotates around or about the cross member longitudinal axis 104. To help prevent further forward movement of the chair back 42 and to help prevent further rotation of the first cross member 94, the fastener 164b engages the back cross member 94 toward the front 120 of the chair 40 and the back cross member 94, knocking against the back cross member 94 to stop rotation of the back cross member 94 and forward movement of the chair back 42.
The attachment member 130a extends through a hole in the upper portion 86b of the lower crossbar member 86, such that the head of the attachment member 130a is situated above the upper portion 86b. The shaft of the attachment member 130a passes through the top hole 162 (shown in
In operation, the chair back 42 flexes from the upright position to the reclined position, such that the top 108 of the chair back 42 moves backward. The attachment member 130a engages the back cross member 94 and the first flex member 96 as the chair back 42 flexes backward, and the first flex member 96 twists as the back cross member 94 rotates relative to the stationary first side member 48. The twisting first flex member 96 arrests further rotation of the back cross member 94 as it rotates relative to the first side member 48 and the second side member 52.
The first front leg 56 is a hollow tubular member and the first leg extension 76 is inserted into one end 170 of the first front leg 56. A leg fastener 172 is connected to the first leg extension 76 and inserted inside the first front leg 56 to secure the first front leg 56 to the first leg extension 76. The fasteners 164a and 164b (shown in
The base 44 supports the chair 40 on a surface and the base 44 maintains the seat 46 and the chair back 42 off the surface. The base 44 includes the first side member 48 at the first side 50 of the chair 40 and the second side member 52 at the second side 54 of the chair 40. The first side member 48 supports the first side 50 of the chair 40 on the surface and the second side member 52 supports the second side 54 of the chair 40 on the surface. The first side member 48 includes the first front leg 56, the first back leg 58, and the first leg extension 76, and the second side member 52 includes the second front leg 60, the second back leg 62, and the second leg extension 78.
The seat 46 is coupled to the first side member 48 and the second side member 52 via the seat support assembly 72 that includes a seat cross member 180 and a seat support 182. The seat cross member 180 is attached to the first front leg 56 and the second front leg 60 and couples the first side member 48 to the second side member 52. The seat support 182 includes a U-shaped bracket 184 connected to the seat cross member 180 and a seat platform 186 rotatably connected to the U-shaped bracket 184. The seat 46 is connected to the seat platform 186, such that the seat rotates between a down, sitting position and an upright position. In the down, sitting position the seat 46 is supported by the seat cross member 180 for sitting on in the down position. The seat 46 folds from the sitting position to the upright position to save space and for storing the chair 40.
As shown in at least
At 300, the method includes the step of fastening a first flex member 96 to a first side member 48 of the chair. In some embodiments, the method includes fitting an extension portion 96b of the first flex member 96 into the first side member 48 prior to fastening the first flex member 96 to the first side member 48. In some embodiments, the method includes securing the first flex member 96 to the first leg extension 76 with fasteners, such as screws or bolts.
At 302, the method includes the step of fastening a second flex member 98 to a second side member 52 of the chair. In some embodiments, the method includes fitting an extension portion of the second flex member 98 into the second side member 52 prior to fastening the second flex member 98 to the second side member 52. In some embodiments, the method includes securing the second flex member 98 to the second leg extension 78 with fasteners, such as screws or bolts.
At 304, the method includes the step of securing the chair back 42 to the back cross member 94, where securing the chair back 42 to the back cross member 94 couples the chair back 42 to the first flex member 96 and the second flex member 98. In some embodiments, securing the chair back 42 to the back cross member 94 includes fitting or inserting a cross member portion 96a of the first flex member 96 into one end of the back cross member 94 and inserting a cross member portion of the second flex member 98 into the other end of the back cross member 94. In some embodiments, securing the chair back 42 to the back cross member 94 includes inserting attachment members, such as the attachment member 130a, through the upper portion 86b of the lower crossbar member 86 of the chair back frame 82 and the back cross member 94 and the first and second flex member 96 and 98 before securing the attachment members to connection blocks, such as connection blocks 106a and 106d. In some embodiments, securing the chair back 42 to the back cross member 94 includes inserting attachment members, such as the attachment member 130b, through the upper portion 86b of the lower crossbar member 86 of the chair back frame 82 and the back cross member 94 and securing the attachment members to connection blocks, such as connection blocks 106b and 106c.
Various modifications and additions can be made to the exemplary embodiments discussed without departing from the scope of the present invention. For example, while the embodiments described above refer to particular features, the scope of this invention also includes embodiments having different combinations of features and embodiments that do not include all of the above described features.
This application claims priority to U.S. Provisional Application No. 62/007,591, filed on Jun. 4, 2014, entitled CHAIR WITH FLEX MEMBER, which is herein incorporated by reference in its entirety.
Number | Date | Country | |
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62007591 | Jun 2014 | US |