Patent Publication Number: US-11375816-B1

Title: Adjustable chair

Description:
BACKGROUND OF THE INVENTION 
     1. Technical Field 
     This disclosure belongs to the field of office appliances, and particularly relates to an adjustable chair. 
     2. Description of Related Art 
     At present, people spend ever longer time sitting in front of a computer at work, and many health issues are caused by sedentary schedules. Nowadays, more and more people are starting to work in a standing posture (both the feet and hips are stressed), and more and more chairs specially used for standing and leaning are designed, accordingly. However, these chairs cannot realize normal sitting (the hips are stressed); 
     Existing adjustable chairs adopting a single pneumatic actuator can only rise or fall once. Because of the restraint of the moving distance of the pneumatic actuator, the chairs cannot be kept low enough to allow users to sit thereon or be high enough to allow the users to stand and lean against. 
     BRIEF SUMMARY OF THE INVENTION 
     The objective of this disclosure is to overcome the defects of the prior art by providing an adjustable chair which is not only suitable for standing and leaning, but also suitable for normal sitting. 
     The objective of this disclosure may be realized through the following technical solution: 
     An adjustable chair comprises a base frame, wherein a chair back is disposed at the rear end of the base frame, a lifting assembly is disposed on the base frame, a seat capable of vertically rotating is disposed on the lifting assembly, the lifting assembly comprises a bottom frame and a top frame which are both formed with sliding slots, the seat is disposed on the top frame, the chair back is disposed on the bottom frame, at least two cross connecting rod assemblies are disposed between the bottom frame and the top frame, cross connecting rods of the cross connecting rod assemblies are connected through shafts, two ends of one cross connecting rod of each cross connecting rod assembly are respectively hinged and fixed to the bottom frame and the top frame, and two ends of the other cross connecting rod of each cross connecting rod assembly slide along the corresponding sliding slot in the bottom frame or the top frame; 
     Furthermore, clamping strips are hinged between the cross connecting rods of the adjacent cross connecting rod assemblies and disposed on the cross connecting rods located on sliding blocks; 
     Strip-shaped clamping grooves which are distributed in a linear array are formed in the bottom frame, and the clamping strips are clamped in the strip-shaped clamping grooves. 
     Furthermore, the cross connecting rods of the adjacent cross connecting rod assemblies are connected through fixing strips. 
     Furthermore, a first pneumatic actuator is disposed at the lower end of the base frame. 
     Furthermore, a support base is arranged at the bottom end of the first pneumatic actuator and is used to support the first pneumatic actuator; 
     The support base comprises a horizontal base and a sloping base arranged on the horizontal base, wheels are disposed at the lower end of the sloping base, and the first pneumatic actuator is disposed at the upper end of the sloping base. 
     Furthermore, a soft material is laid on the horizontal base of the support base. 
     Furthermore, the seat is hinged to the top frame; 
     A locking mechanism is disposed on a hinge point of the seat and the top frame and is used to lock the seat and the top frame to prevent the seat and the top frame from rotating. 
     Furthermore, inner sides of the cross connecting rods, sliding along the sliding slots in the bottom frame and the top frame, of the cross connecting rod assemblies are hinged and connected to piston rods of second pneumatic actuators, and cylinder seats of the second pneumatic actuators are hinged to the bottom frame. 
     Furthermore, flexible parts are arranged in sliding slots and each have an end firmly connected to the inner wall of the corresponding sliding slot and an end fixedly connected to an end of the cross connecting rod, corresponding to the sliding slot, of one cross connecting rod assembly. 
     Furthermore, two ends of the other cross connecting rod of each cross connecting rod assembly are respectively hinged to sliding blocks, and the sliding blocks are disposed in the corresponding sliding slots in the bottom frame or the top frame and are able to slide along the corresponding sliding slots in the bottom frame or the top frame; 
     Flexible parts are arranged in the sliding slots and each have an end firmly connected to the inner wall of the corresponding sliding slot and an end fixedly connected to the sliding block corresponding to the sliding slot. 
     This disclosure has the following beneficial effects: 
     By adjusting the height of the chair through the lifting assembly and adjusting the rotation angle of the seat, users not only can stand and lean against the chair, but also can normally sit on the chair. 
    
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
       To more clearly explain the technical solutions of the embodiments of this disclosure or the prior art, drawings required for the description of the embodiments of this disclosure or the prior art are briefly introduced below. Obviously, those ordinarily skilled in the art can obtain other drawings according to the following ones without creative labor. 
         FIG. 1  is an overall structural view of an embodiment of this disclosure; 
         FIG. 2  is a partial structural view of the embodiment of this disclosure; 
         FIG. 3  is a structural view, from another perspective, of  FIG. 2  of the embodiment of this disclosure. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The technical solutions of the embodiments of this disclosure will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments. Clearly, the embodiments described hereafter are merely illustrative ones, and are not all possible ones of this disclosure. All other embodiments obtained by those ordinarily skilled in the art on the basis of the following ones without creative labor should also fall within the protection scope of this disclosure. 
     As shown in  FIG. 1  to  FIG. 3 , an adjustable chair comprises a base frame  1 , wherein a chair back  100  is disposed at the rear end of the base frame  1 , a lifting assembly is disposed on the base frame  1 , and a seat  101  capable of rotating vertically is disposed on the lifting assembly. 
     During use, the seat  101  rotates vertically with respect to the chair back  100  to be vertically tilted or horizontal. When the seat  101  is vertically tilted, a user can stand and lean against the seat  101  (both the feet and hips are stressed) at work (hereinafter referred to as a “standing and leaning position” to facilitate the description). When the seat  101  is horizontal, the user can normally sit on the seat  101  at work (hereinafter referred to as a “sitting position” to facilitate the description). When the seat  101  is vertically tiled or horizontal, the height of the seat  101  can be adjusted through the lifting assembly to ensure an optimum height of the seat  101 . 
     In this embodiment, the lifting assembly comprises a bottom frame  3  and a top frame  4  which are both formed with sliding slots  300 , wherein the seat  101  is disposed on the top frame  4 , the chair back  100  is disposed on the bottom frame  3 , at least two cross connecting rod assemblies  5  are disposed between the bottom frame  3  and the top frame  4 , cross connecting rods  51  of the cross connecting rod assemblies  5  are connected through shafts, two ends of one cross connecting rod  51  of each cross connecting rod assembly  5  are respectively hinged and fixed to the bottom frame  3  and the top frame  4 , and two ends of the other cross connecting rod  51  of each cross connecting rod assembly  5  slide along the corresponding sliding slot  300  in the bottom frame  3  or the top frame  4 . 
     Clamping strips  52  are hinged between the cross connecting rods  51  of the adjacent cross connecting rod assemblies  5  and are disposed on the cross connecting rods  51  located on sliding blocks. 
     Strip-shaped clamping grooves  30  which are distributed in a linear array are formed in the bottom frame  3 , and the clamping strips  52  are clamped in the strip-shaped clamping grooves  30 . 
     During use, the top frame  4  is pressed or lifted to change the overall height of the cross connecting rod assemblies  5 , so as to adjust the height of the seat  101 . After the height of the seat is adjusted, the clamping strips  52  are clamped in the strip-shaped clamping grooves  30  to remain the overall height of the cross connecting rod assemblies  5  stable. 
     In this embodiment, inner sides of the cross connecting rods  51 , sliding along the sliding slots  300  in the bottom frame  3  and the top frame  4 , of the cross connecting rod assemblies  5  are hinged and connected to piston rods of second pneumatic actuators  9 , and cylinder seats of the second pneumatic actuators  9  are hinged to the bottom frame  3 . The second pneumatic actuators  9  are used as a power source to adjust the overall height of the cross connecting rod assemblies  5 . 
     In this embodiment, springs  301  are arranged in the sliding slots  300 , one end of each spring  301  is firmly connected to the inner wall of the corresponding sliding slot  300 , and the other end of each spring  301  is fixedly connected to the end of the corresponding cross connecting rod  51  of one cross connecting rod assembly  5 . The cross connecting rods  51 , located in the sliding slots  300 , of the cross connecting rod assemblies  5  can restore by means of the springs  301 . 
     In another embodiment, two ends of the other cross connecting rod  51  of each cross connecting rod assembly  5  are respectively hinged to sliding blocks, and the sliding blocks are respectively disposed in the corresponding sliding slots  300  in the bottom frame  3  or the top frame  4  and are able to slide along the corresponding sliding slots  300  in the bottom frame  3  or the top frame  4 ; 
     Springs  301  are arranged in the sliding slots  300 , one end of each spring  301  is firmly connected to the inner wall of the corresponding sliding slot  300 , and the other end of each spring  301  is fixedly connected to the sliding block corresponding to the sliding slot  300 . 
     The sliding blocks slide along the sliding slots  300  to drive the ends of the corresponding cross connecting rods  51  of the cross connecting rod assemblies  5  to move, and meanwhile, the springs  301  can restore the sliding blocks to enable the cross connecting rods  51 , located in the sliding slots, of the cross connecting rod assemblies  5  to restore. 
     In another embodiment, the springs  301  are springs, flexible bars or the like. 
     In this embodiment, the cross connecting rods  51  of the adjacent cross connecting rod assemblies  5  are connected through fixing strips  53 . In this way, the cross connecting rods  51  of the adjacent cross connecting rod assemblies  5  can move synchronously to ensure that the cross connecting rod assemblies  5  can rise or fall more steadily. 
     In another embodiment, a first pneumatic actuator  6  is arranged at the lower end of the base frame  1 . The height of the base frame  1  can be adjusted by means of the first pneumatic actuator  6 , so the height of the chair back  100  and the height of the seat  101  can be adjusted as actually needed. 
     In another embodiment, a support base  7  is arranged at the bottom end of the first pneumatic actuator  6  and is used to support the first pneumatic actuator  6 . Wheels  8  are arranged on the support base  7 , and the whole chair can be pushed to be transferred by means of the wheels  8 . 
     In one scenario, the support base  7  comprises a horizontal base  70  and a sloping base  71  arranged on the horizontal base  70 , wherein the wheels  8  are disposed at the lower end of the sloping base  71 , and the first pneumatic actuator  6  is disposed at the upper end of the sloping base  71 . During use, a user stands on the horizontal base  70  to lean against the chair, and at this moment, the sloping base  71  tilts upwards to lift the wheels  8  on the sloping base  71  off the ground, so that the stability of the chair is guaranteed when the user stands and leans against the chair. 
     In one embodiment, a soft material such as a PU sponge is laid on the horizontal base  70  of the support base  7 . 
     In one embodiment, the seat  101  is hinged to the top frame  4 ; 
     A locking mechanism  8  is disposed on a hinge point of the seat  101  and the top frame  4  and is used to lock the seat  101  and the top frame  4  to prevent the seat  101  and the top frame  4  from rotating, so as to keep the angle between the seat  101  and the top frame  4  constant. The angle between the seat  101  and the top frame  4  can be adjusted as actually needed by vertical rotation of the seat  101 . 
     The locking mechanism  8  may be an existing locking knob, a fastening button, or a fastening bolt that can keep the angle between the seat  101  and the top frame  4  constant. 
     In this specification, reference terms such as “one embodiment”, “example” and “specific example” are intended to indicate that the specific characteristics, structures, materials or features described in this embodiment or example are included in at least one embodiment or example of this disclosure. In this specification, illustrative presentations of these terms do not refer to identical embodiments or examples. In addition, the specific characteristics, structures, materials or features described can be properly combined in any one or more embodiments or examples. 
     The basic principle, major characteristics and advantages of this disclosure are represented and described above. Those skilled in the art would appreciate that this disclosure is not limited to the above embodiments, and that the above embodiments and the description in this specification are merely for explaining the principle of this disclosure. Different alterations and improvements of this disclosure can be made without departing from the spirit and scope of this disclosure, and all these alterations and improvements should also fall within the protection scope of this disclosure.