Patent Publication Number: US-2015061336-A1

Title: Chair with seat of adjustable length

Description:
FIELD OF THE INVENTION 
     The present invention relates to a chair, and more particularly to the chair with a seat of adjustable length. 
     BACKGROUND OF THE INVENTION 
     Chair is a common piece of furniture used in daily life, and the effects of fitting a user&#39;s buttock and providing a comfortable sitting posture are the key points for designing a chair, particularly for users who have to sit for a long time. 
     However, the curve and the size of a user&#39;s buttock vary, and present existing chairs available in the market are unable to attach to the buttocks of different users, so that when a user sits on a chair, the user&#39;s buttock may not be supported uniformly by the chair, and a poor sitting posture may result when the user sits on the chair for a long time. Meanwhile, the existing chairs available in the market do not provide a correction function for users with a wide hip or deformed hip problem. 
     In view of the aforementioned shortcomings, the inventor of the present invention based on years of experience in the related industry to conduct extensive researches and experiments to develop and design a chair with a seat of adjustable length to overcome the aforementioned shortcomings of the related art. 
     SUMMARY OF THE INVENTION 
     Therefore, the present invention is to provide a chair with a seat of adjustable length, wherein the width of the seat can be adjusted and limited, so that the chair can be attached to a user&#39;s buttock closely and can provide the function of correcting a user&#39;s sitting post and pelvis. 
     To achieve the aforementioned objective, the present invention provides a chair with a seat of adjustable length, comprising: a chair stand; a transmission shaft, mounted onto the chair stand, and being rotatable with respect to the chair stand, and having a left spiral thread and a right spiral thread in opposite directions formed on the exterior of the transmission shaft; a first chair seat, sheathed on the transmission shaft, and screwed and rotated along the left spiral thread; and a second chair seat, sheathed on the transmission shaft, and screwed and rotated along the right spiral thread; such that the first chair seat and the second chair seat can be driven synchronously to approach or move away from one another. 
     The present invention further has the following effects: 
     1. The first chair seat and the second chair seat are screwed and transmitted with respect to the left spiral thread and the right spiral thread of the transmission shaft respectively to drive the first chair seat and the second chair seat synchronously to approach or move away from each other, so that the chair seat of the chair can be adjusted according to the size of a user&#39;s buttock to attach the first chair seat and the second chair seat to the user&#39;s buttock closely and restrict the user&#39;s sitting posture, so as to achieve the effects of hip shaping, pelvic correction and sitting posture correction. 
     2. The chair of the present invention further comprises an adjusting mechanism coupled to the transmission shaft and operated together with the transmission shaft for adjusting the gap between the first chair seat and the second chair seat, and thus the chair of the present invention chair has the advantage of adjusting the width of the chair seats. 
     3. The first seat body with a first hip-shaped cambered surface and the second seat body with a second hip-shaped cambered surface come with a design of attaching a human buttock closely, so that a user can sit on the chair ergonomically and comfortably. 
     4. The first hip-shaped cambered surface and the second hip-shaped cambered surface come with a design of attaching a human buttock closely and the gap between the first chair seat and the second chair seat can be adjusted, such that the first chair seat and the second chair seat can support the user&#39;s weight uniformly at the periphery, both sides and the bottom of the user&#39;s buttock to further improve the effects of hip shaping, pelvic correction and sitting posture correction. 
     5. The chair of the present invention further comprises two pads fixed to the first seat body and the second seat body respectively to enhance the softness of the first seat body and second seat body for the sitting purpose. 
     6. Each internal surface of the two pads has a hip-shaped recessed area with a design of attaching a human buttock closely, so that the chair of the present invention is comfortable for sitting and in compliance with ergonomics, hip shaping, pelvic correction and sitting posture correction requirements. 
     7. The chair of the present invention chair further comprises a battery, and the adjusting mechanism is a motor drive assembly, and the battery is electrically coupled to the motor drive assembly. However, the chair of the present invention chair will not be limited by a power cable, so that the chair can be moved or disposed anywhere in a room, and the chair of the invention features a convenient use and disposition. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of a chair of the present invention; 
         FIG. 2  is a partial blow-up view of a chair of the present invention; 
         FIG. 3  is an exploded view of a chair of the present invention; 
         FIG. 4  is a schematic view of a using status of a chair of the present invention; 
         FIG. 5  is a schematic view of another using status of a chair of the present invention; 
         FIG. 6  is a schematic view of a chair in accordance with another preferred embodiment of the present invention; and 
         FIG. 7  is a schematic view of a chair in accordance with a further preferred embodiment of the present invention. 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The technical contents of the present invention will become apparent with the detailed description of preferred embodiments accompanied with the illustration of related drawings as follows. It is noteworthy that the drawings are provided for the purpose of illustrating the present invention, but not intended for limiting the scope of the invention. 
     With reference to  FIGS. 1 to 5  for a chair with a seat of adjustable length in accordance with the present invention, the chair  10  comprises a chair stand  1 , a transmission shaft  2 , a first chair seat  3  and a second chair seat  4 . 
     The chair stand  1  is a shank with a plurality of supporting pawls extended from an end of the shank. However, the shape of the chair stand  1  of the present invention is not limited to the aforementioned shape only, but it can also be of any other geometric shape. 
     The transmission shaft  2  is installed to the chair stand  1  and rotatable with respect to the chair stand  1 , and a left spiral thread  21  and a right spiral thread  22  in opposite directions are formed on the exterior of the transmission shaft  2 . 
     The first chair seat  3  is sheathed on the transmission shaft  2  and screwed and transmitted along the left spiral thread  21 . More specifically, the first chair seat  3  includes a first seat body  31  and a first actuating element  32  fixed to the bottom of the first seat body  31 , and the first seat body  31  has a first recessed slot  311 , and the first actuating element  32  is fixed to the bottom of the first recessed slot  311 . 
     In addition, the first seat body  31  has a first sitting portion  312  and a first abutting portion  313  extended from a side of the external periphery of the first sitting portion  312 , and internal sides of the first sitting portion  312  and the first abutting portion  313  have a first hip-shaped cambered surface  314 , and the first actuating element  32  has a first screw hole  321  and one or more first penetrating holes  322 . 
     The second chair seat  4  is sheathed on the transmission shaft  2  and screwed and transmitted along the right spiral thread  22  to drive the first chair seat  3  and the second chair seat  4  synchronously to approach or move away from each other. Specifically, the second chair seat  4  includes a second seat body  41  and a second actuating element  42  fixed to the bottom of the second seat body  41 , and the second seat body  41  has a second recessed slot  411 , and the second actuating element  42  is fixed to the bottom of the second recessed slot  411 . 
     In addition, the second seat body  41  has a second sitting portion  412 , and a second abutting portion  413  extended from a side of the external periphery of the s second sitting portion  412  and symmetrical to the first abutting portion  313 , and internal sides of the second sitting portion  412  and second abutting portion  413  have a second hip-shaped cambered surface  414 . In addition, the second actuating element  42  has a second screw hole  421  and one or more second penetrating holes  422 . Wherein, the first hip-shaped cambered surface  314  and the second hip-shaped cambered surface  414  come with a design of attaching a human buttock closely. 
     In addition, the left spiral thread  21  of the transmission shaft  2  is screwed with respect to the first screw hole  321  and the right spiral thread  22  is screwed with respect to the second screw hole  421 , such that the first chair seat  3  and the second chair seat  4  can be screwed and transmitted with respect to the transmission shaft  2 . 
     The chair with a seat of adjustable length  10  in accordance with the present invention further comprises a position limiting mechanism  5  for restricting the moving range of the first chair seat  3  and the second chair seat  4 , and the position limiting mechanism  5  is coupled to the chair stand  1 . 
     Specifically, the position limiting mechanism  5  comprises one or more positioning guide rods  51  installed onto the chair stand  1  and disposed on a side of the transmission shaft  2 , and the positioning guide rod  51  is passed and slid into the first penetrating hole  322  and the second penetrating hole  422 , and the first chair seat  3  and the second chair seat  4  are sheathed on the positioning guide rod  51  and slid along the positioning guide rod  51 . 
     The position limiting mechanism  5  further includes a mount  52  mounted onto the chair stand  1 , and the mount  52  includes a base  521  and a wall  522  extended from the periphery of the base  521 . The transmission shaft  2  and the positioning guide rod  51  are fixed between both sides of the wall  522 , and the transmission shaft  2  is rotated with respect to the mount  52 , and the mount  52  is contained in the first recessed slot  311  and the second recessed slot  411 . 
     The chair with a seat of adjustable length  10  in accordance with the present invention further comprises an adjusting mechanism  6  coupled to the transmission shaft  2  and operated together with the transmission shaft  2 . The adjusting mechanism  6  can be a handwheel  61  integrally formed with the transmission shaft  2   a  and exposed from a side of the first chair seat  3  or the second chair seat  4 . 
     The chair with a seat of adjustable length  10  in accordance with the present invention further comprises two pads  71 , wherein one of the pads  71  is fixed on internal surfaces of the first sitting portion  312  and the first abutting portion  313 , and the other pad  71  is fixed on internal surfaces of the second sitting portion  412  and the second abutting portion  413 , and inner surfaces of the two pads  71  have a hip-shaped recessed area  711 , wherein the hip-shaped recessed area  711  comes with a design of attaching a human buttock closely. 
     The chair with a seat of adjustable length  10  in accordance with the present invention further comprises an elevating mechanism  72  coupled to the chair stand  1  and provided for adjusting the elevation of the chair stand  1 . 
     With reference to  FIGS. 1 to 3  for the assembly of a chair with a seat of adjustable length  10  in accordance with the present invention, the transmission shaft  2  is mounted onto the chair stand  1  and rotatable with respect to the chair stand  1 , left spiral thread  21  and right spiral thread  22  opposite to one another are formed on the exterior of the transmission shaft  2 . The first chair seat  3  is sheathed on the transmission shaft  2  and screwed and transmitted along the left spiral thread  21 . The second chair seat  4  is sheathed on the transmission shaft  2  and screwed and transmitted along the right spiral thread  22 , and the first chair seat  3  and the second chair seat  4  are driven to approach or move away from one another. The transmission shaft  2  is provided for driving the first chair seat  3  and the second chair seat  4  to approach or move away from one another in order to adjust and limit the width of the chair seats, so that the chair seats of the chair  10  can be attached to a user&#39;s buttock closely to provide the functions of sitting posture correction and pelvic correction. 
     With reference to  FIGS. 4 and 5  for the using status of a chair with a seat of adjustable length  10  in accordance with the present invention, a left spiral thread  21  and a right spiral thread  22  in opposite directions with each other are formed at the exterior of the transmission shaft  2 , so that when the transmission shaft  2  is rotated, the left spiral thread  21  of the transmission shaft  2  is screwed with respect to the first screw hole  321  and the right spiral thread  22  is screwed with respect to the second screw hole  421 , so that the first chair seat  3  and the second chair seat  4  can be screwed and transmitted with respect to the transmission shaft  2  to drive the first chair seat  3  and the second chair seat  4  synchronously to approach and move away from one another, and the chair seats of the chair  10  can be adjusted according to the size of a user&#39;s buttock, so that the first chair seat  3  and the second chair seat  4  can be attached to the user&#39;s buttock closely and restrict the user&#39;s sitting posture. Therefore, the invention can provide the effects of hip shaping, pelvic correction and sitting posture correction. 
     In addition, the chair  10  of the present invention further comprises a position limiting mechanism  5  for restricting the moving range of the first chair seat  3  and the second chair seat  4 , and the position limiting mechanism  5  includes a positioning guide rod  51 , and the first chair seat  3  and the second chair seat  4  are sheathed on the positioning guide rod  51  and slid along the positioning guide rod  51 , so that the chair  10  of the present invention can restrict the first chair seat  3  and the second chair seat  4  to rotate with the transmission shaft  2  through a simple component of the positioning guide rod  51 , so as to achieve the effect of the first chair seat  3  and the second chair seat  4  being screwed and transmitted stably with the transmission shaft  2 . 
     The first chair seat  3  further includes a first seat body  31 , and the second chair seat  4  further includes a second seat body  41 , and the first seat body  31  has a first recessed slot  311 , and the second seat body  41  has a second recessed slot  411 . The position limiting mechanism  5  further includes a mount  52  fixed onto the chair stand  1 , and the mount  52  includes a base  521  and a wall  522  extended from the periphery of the base  521 , and the transmission shaft  2  and the positioning guide rod  51  are positioned between both sides of the wall  522 , and the mount  52  can be hidden into the first recessed slot  311  and the second recessed slot  411  to reduce the total volume of the chair  10  of the present invention chair  10  effectively, while maintaining the aesthetic appearance of the chair  10  of the present invention chair  10 . 
     In addition, the chair  10  of the present invention further comprises an adjusting mechanism  6  coupled to the transmission shaft  2  and operated together with the transmission shaft  2 . In this preferred embodiment, the adjusting mechanism  6  is a handwheel  61  integrally formed with the transmission shaft  2 , and the handwheel  61  can be rotated to adjust the gap between the first chair seat  3  and the second chair seat  4  to achieve the effect of adjusting the width of the chair seat conveniently. 
     In addition, the first seat body  31  has a first hip-shaped cambered surface  314 , and the second seat body  41  has a second hip-shaped cambered surface  414 , and the first hip-shaped cambered surface  314  and the second hip-shaped cambered surface  414  come with a design of attaching to a human buttock closely, so that a user can sit on the chair  10  ergonomically and comfortably. 
     Compared with the conventional chair seat with a horizontal surface and causing the force provided by the chair seat for supporting the user&#39;s weight to be concentrated at the bottom of the user&#39;s buttock the present invention has a first hip-shaped cambered surface  314  and a second hip-shaped cambered surface  414  with the design of attaching a human buttock closely, and the gap between the first chair seat  3  and the second chair seat  4  can be adjusted, so that the supporting forces provided by the first chair seat  3  and the second chair seat  4  support the user&#39;s weight at the periphery, both sides, and the bottom of the user&#39;s buttock uniformly, so as to further improve the effects of hip shaping, pelvic correction and sitting posture correction. 
     In addition, the present invention chair  10  further comprises two pads  71  fixed to the first seat body  31  and the second seat body  41  respectively to enhance the softness of the first seat body  31  and the second seat body  41 , and inner surfaces of the two pads  71  have a hip-shaped recessed area  711  with the design of attaching a human buttock closely, so that the chair  10  of the present invention has the features of comfortable sitting, ergonomic design, hip shaping, pelvic correction and sitting posture correction. 
     With reference to  FIG. 7  for a chair in accordance with another preferred embodiment of the present invention, the adjusting mechanism  6  is a motor drive assembly  62  capable of driving the transmission shaft  2  to rotate, so that the motor drive assembly  62  can be turned on to adjust the gap between the first chair seat  3  and the second chair seat  4 , so that the present invention chair  10  has the advantages of adjusting the width of the chair seat conveniently. 
     In addition, the chair  10  of the present invention further comprises a battery  8  electrically coupled to the motor drive assembly  62  to avoid the limitation of a power cable of the chair  10  of the present invention, so that the chair  10  can be moved to any place in a room conveniently, and the present invention chair  10  can provide convenient use and disposition. 
     With reference to  FIG. 7  for a chair in accordance with a further preferred embodiment of the present invention, the chair  10  further comprises a backrest  91  and a pair of armrests  92 , and the backrest  91  is coupled to the chair stand  1  and disposed on a side of the first chair seat  3  and the second chair seat  4 , and the two armrests  92  are coupled to the chair stand  1  and disposed on both sides of the first chair seat  3  and the second chair seat  4  to improve the effect of sitting on the chair  10  of the present invention chair  10  comfortably. 
     In summation of the description above, the present invention achieves the expected objectives and overcomes the drawbacks of the related art, and the invention complies with patent application requirements, and is thud duly filed for patent application. 
     While the invention has been described by means of specific embodiments, numerous modifications and variations could be made thereto by those skilled in the art without departing from the scope and spirit of the invention set forth in the claims.