Bifunctional chair for sitting and kneeling

Abstract

The subject matter of the invention is a convertible bi-functional chair for sitting and kneeling, which allows to change positions and relieve the spine during long-lasting work involving sitting or long travels by plane, bus or train. The bi-functional chair for sitting and kneeling comprises a movable rotating seat ( 1 ), back rest ( 3 ) and knee support ( 6 ). It is equipped with devices allowing to change the distance between the front edge of the seat and the back rest, the angle of inclination of the back rest with regard to the seat and the height of the back rest with regard to the seat, which enables converting the seat and back rest for classic sitting into a seat and back rest for kneeling and vice versa.

1 . Bi-functional chair for sitting and kneeling comprising a seat with adjustable angle of inclination, backrest and movable knee support characterized in that it is equipped with devices allowing to change the distance between the front edge of the seat and the backrest, the angle of inclination of the backrest in relation to the seat and the height of the backrest in relation to the seat, which enables conversion of the seat and backrest for classic sitting into a seat and backrest for kneeling and vice versa. 
     
     
         2 . (canceled) 
     
     
         3 . Bi-functional chair for sitting and kneeling equipped with a seat with adjustable angle of inclination, backrest and movable knee support pursuant to  claim 1 , characterized in that it is equipped with a device maintaining the backrest angle selected by the user without the necessity to lock the movement of the backrest manually. 
     
     
         4 . Bi-functional chair pursuant to  claim 3  characterized in that the device maintaining the backrest angle selected by the user without the necessity to lock the movement of the backrest is constructed in such a manner that the chair pedestal ( 62 ) is connected with the chair column ( 63 ) affixed with seat support ( 4 ); the seat support ( 4 ) is rotationally connected through rotation axis ( 64 ) to the seat mount ( 2 ), which is connected to seat ( 1 ); the seat support ( 4 ) is rotationally connected through rotation axis ( 66 ) to arm ( 67 ), which is in turn, through backrest frame rotation axis ( 68 ), is connected to the backrest inclination mechanism mount ( 69 ); the backrest inclination mechanism mount ( 69 ) is rotationally connected through rotation axis ( 70 ) to string ( 71 ) connected rotationally through rotation axis ( 72 ) to the seat mount; the backrest inclination mechanism mount ( 69 ) is affixed with retaining walls ( 73 ) and ( 74 ) of spring ( 75 ) tightened by means of screw ( 76 ) through washer ( 77 ); the backrest frame rotation axis ( 68 ) is joined with spring pusher ( 78 ) pushing bolt ( 79 ) moving through an aperture in wall ( 73 ) and connected to washer ( 80 ); the seat support ( 4 ) is affixed with seat support bracket ( 81 ) with an aperture through which slides bolt ( 82 ) moved by lever ( 83 ); the bolt enters the aperture of the seat support ( 84 ) connected to seat mount ( 2 ). 
     
     
         5 . Bi-functional chair pursuant to  claim 3  characterized in that the device maintaining the backrest angle selected by the user without the necessity to lock the movement of the backrest comprises an assembly for equalizing the resistance of the backrest with the weight of the user and is constructed in such a manner that the chair pedestal ( 62 ) is connected with the chair column ( 63 ) affixed with seat support ( 4 ); the seat support ( 4 ) is rotationally connected through rotation axis ( 64 ) to the seat mount ( 2 ), which is connected to seat ( 1 ) through rotation axis ( 65 ); the seat support ( 4 ) is rotationally connected through rotation axis ( 66 ) to arm ( 67 ), which is in turn, through backrest frame rotation axis ( 68 ), is connected to the backrest inclination mechanism mount ( 69 ); the backrest inclination mechanism mount ( 69 ) is rotationally connected through rotation axis ( 70 ) to string ( 71 ) connected rotationally through rotation axis ( 72 ) to the seat mount; the backrest inclination mechanism mount ( 69 ) is affixed with retaining walls ( 73 ) and ( 74 ) of spring ( 75 ) tightened by means of screw ( 76 ) through washer ( 77 ); the backrest frame rotation axis ( 68 ) is joined with spring pusher ( 78 ) pushing bolt ( 79 ) moving through an aperture in wall ( 73 ) and connected to washer ( 80 ); the seat support ( 4 ) is affixed with seat support bracket ( 81 ) with an aperture through which slides bolt ( 82 ) moved by lever ( 83 ); the bolt enters the aperture of the seat support ( 84 ) connected to seat mount ( 2 ); the backrest rotation axis ( 68 ) is joined with lever ( 86 ) rotationally connected to slider ( 87 ), which in turn is rotationally connected to lever ( 88 ) rotationally set on axis ( 89 ) mounted on the backrest inclination mechanism mount ( 69 ); lever ( 88 ) is rotationally connected to string ( 90 ) which is rotationally connected to lever ( 91 ), which in turn is rotationally connected through axis ( 92 ) to the seat mount ( 2 ); lever ( 91 ) is rotationally connected with arm ( 93 ) which is rotationally connected to seat ( 1 ). 
     
     
         6 . Bi-functional chair for sitting and kneeling comprising a seat with changeable angle of inclination, backrest and movable knee support pursuant to  claim 1  characterized in that the seat ( 1 ) is slide connected by means of any type of sliding mechanism ( 7 ) equipped with slide lock, to the seat mount ( 2 ); seat mount ( 2 ) is rotationally connected, with any type of rotation lock, to chair pedestal assembly ( 4 )—connection rotation axis ( 8 ); seat mount ( 2 ) is rotationally connected, with any type of rotation lock, to backrest support ( 5 )—connection rotation axis ( 10 ); backrest support ( 5 ) is connected to backrest ( 3 ) by means of any type of sliding mechanism ( 14 ) locked in any manner, which allows for vertical sliding; if the seat is dividable knee support ( 6 ) constitutes an extension of the seat when the chair is arranged in the sitting position; if the seat is not dividable the knee support ( 6 ) is placed under the seat and is moved to the kneeling position during conversion of the chair by means of any type of mechanism. 
     
     
         7 . Bi-functional chair for sitting and kneeling comprising a seat with changeable angle of inclination, backrest and movable knee support pursuant to  claim 1  characterized in that seat mount ( 2 ) is rotationally connected, through any type of rotation lock, to the chair pedestal assembly ( 4 )—connection rotation axis ( 8 ); seat mount ( 2 ) is connected by means of any type of rotating and sliding mechanism ( 15 ) with any type of movement lock, to backrest support ( 5 )—connection rotation axis ( 16 ); backrest support ( 5 ) is connected by means of any type of sliding mechanism allowing for vertical movement ( 14 ), with any type of slide lock, to backrest ( 3 ); if the seat is dividable knee support ( 6 ) constitutes an extension of the seat when the chair is arranged in the sitting position; if the seat is not dividable knee support ( 6 ) is placed below the seat and is moved to the kneeling position during conversion of the chair by means of any type of mechanism. 
     
     
         8 . Bi-functional chair for sitting and kneeling comprising a seat with changeable angle of inclination, backrest and movable knee support pursuant to  claim 1  characterized in that seat mount ( 2 ) is rotationally connected, through any type of rotation lock, to the chair pedestal assembly ( 4 )—connection rotation axis ( 8 ); the end of seat mount ( 2 ) is rotationally connected to backrest support ( 5 )—connection rotation axis ( 18 ); backrest support ( 5 ) is shaped in such a manner that in the sitting position the lumbar support point of the backrest located closest to the front overlaps at least 35 mm on the seat; backrest support ( 5 ) is connected to backrest ( 3 ); if the seat is dividable knee support ( 6 ) constitutes an extension of the seat when the chair is arranged in the sitting position; if the seat is not dividable knee support ( 6 ) is placed below the seat and is moved to the kneeling position during conversion of the chair by means of any type of mechanism. 
     
     
         9 . Bi-functional chair for sitting and kneeling comprising a seat with changeable angle of inclination, backrest and movable knee support pursuant to  claim 1  characterized in that seat mount ( 2 ) is rotationally connected, through any type of rotation lock, to the chair pedestal assembly ( 4 )—connection rotation axis ( 8 ); the end of seat mount ( 2 ) is rotationally connected to backrest support ( 5 )—connection rotation axis ( 18 ); backrest support ( 5 ) is shaped in such a manner that in the sitting position the lumbar support point of the backrest located closest to the front overlaps at least 35 mm on the seat; backrest support ( 5 ) is connected to backrest ( 3 ); the chair comprises a mechanism automatically adjusting the angle between the backrest and the seat during conversion of the chair from the classic sitting position to the kneeling position, constructed in such a manner that the chair pedestal assembly ( 4 ) is rotationally connected to string ( 21 )—connection rotation axis ( 22 ); the other end of the string ( 21 ) is rotationally connected to sliding component ( 24 )—connection rotation axis ( 23 ); sliding component ( 24 ) is slide connected to seat mount ( 2 ) in a manner allowing for horizontal movement from the front to the end of the seat and vice versa; sliding component ( 24 ) is rotationally connected to string ( 25 )—connection rotation axis ( 23 ); the other end of string ( 25 ) is rotationally connected to the short arm of backrest support ( 27 )—connection rotation axis ( 26 ). If the seat is dividable the knee support ( 6 ) constitutes an extension of the seat when the chair is arranged in the sitting position; if the seat is not dividable the knee support ( 6 ) is placed under the seat and is moved to the kneeling position during conversion of the chair by means of any mechanism. 
     
     
         10 . Bi-functional chair for sitting and kneeling comprising a seat with changeable angle of inclination, backrest and movable knee support pursuant to  claim 1  characterized in that seat mount ( 2 ) is rotationally connected, through any type of rotation lock, to the chair pedestal assembly ( 4 )—connection rotation axis ( 8 ); seat mount ( 2 ) is rotationally connected to string ( 29 )—connection rotation axis ( 28 ); the other end of string ( 29 ) is rotationally connected to backrest support mounting plate ( 31 )—connection rotation axis ( 30 ); the front of backrest support mounting plate ( 31 ) is rotationally connected to string ( 33 )—connection rotation axis ( 32 ); the other end of string ( 33 ) is rotationally connected to chair pedestal assembly ( 4 )—connection rotation axis ( 34 ); string ( 33 ) is additionally rotationally connected to string ( 36 )—connection rotation axis ( 35 ); the other end of string ( 36 ) is rotationally connected to seat mount ( 2 )—connection rotation axis ( 37 ); backrest support mounting plate ( 31 ) is rotationally connected, with any type of rotation lock, to backrest support ( 5 )—connection rotation axis ( 38 ); backrest support ( 5 ) is affixed to backrest ( 3 ); if the seat is dividable knee support ( 6 ) constitutes an extension of the seat when the chair is arranged in the sitting position; if the seat is not dividable knee support ( 6 ) is placed below the seat and is moved to the kneeling position during conversion of the chair by means of any type of mechanism. 
     
     
         11 . Bi-functional chair for sitting and kneeling comprising a seat with changeable angle of inclination, backrest and movable knee support pursuant to  claim 1  characterized in that seat mount ( 2 ) is rotationally connected, through any type of rotation lock, to the chair pedestal assembly ( 4 )—connection rotation axis ( 8 ); the rear of the seat mount ( 2 ) is rotationally connected to string ( 41 )—connection rotation axis ( 40 ); the other end of string ( 41 ) is rotationally connected to sliding component ( 43 )—connection rotation axis ( 42 ); sliding component ( 43 ) is slide connected by means of any type of sliding mechanism ( 44 ) to chair pedestal assembly ( 4 ); sliding component ( 43 ) is rotationally connected, with any type of rotation lock, to backrest support ( 5 )—connection rotation axis ( 45 ); backrest support ( 5 ) is affixed to backrest ( 3 ); if the seat is dividable knee support ( 6 ) constitutes an extension of the seat when the chair is arranged in the sitting position; if the seat is not dividable knee support ( 6 ) is placed below the seat and is moved to the kneeling position during conversion of the chair by means of any type of mechanism. 
     
     
         12 . Bi-functional chair for sitting and kneeling comprising a seat with changeable angle of inclination, backrest and movable knee support pursuant to  claim 1  characterized in that seat mount ( 2 ) is rotationally connected, through any type of rotation lock, to the chair pedestal assembly ( 4 )—connection rotation axis ( 8 ); seat mount ( 2 ) is rotationally connected to string ( 47 )—connection rotation axis ( 46 ), the other end of string ( 47 ) is rotationally connected to backrest support mounting plate ( 49 )—connection rotation axis ( 48 ); backrest support plate ( 49 ) is rotationally connected to strings ( 51 ) and ( 52 )—connection rotation axes ( 50 ) and ( 53 ); the other ends of strings ( 51 ) and ( 52 ) are rotationally connected to chair pedestal assembly ( 4 )—rotation axes ( 54 ) and ( 55 ); the ends of rotation axes ( 50 ), ( 53 ), ( 54 ) and ( 55 ) are arranged in relation to each other in the form of a rhomboid; backrest support mounting plate ( 49 ) is rotationally connected, with any type of rotation lock, to backrest support ( 5 )—connection rotation axis ( 56 ); backrest support ( 5 ) is connected to backrest ( 3 ); if the seat is dividable knee support ( 6 ) constitutes an extension of the seat when the chair is arranged in the sitting position; if the seat is not dividable knee support ( 6 ) is placed below the seat and is moved to the kneeling position during conversion of the chair by means of any type of mechanism. 
     
     
         13 . Bi-functional chair for sitting and kneeling comprising a seat with changeable angle of inclination, backrest and movable knee support pursuant to  claim 1  characterized in that seat mount ( 2 ) is rotationally connected, through any type of rotation lock, to the chair pedestal assembly ( 4 )—connection rotation axis ( 8 ); seat mount ( 2 ) is rotationally connected to string ( 29 )—connection rotation axis ( 28 ); the other end of string ( 29 ) is rotationally connected to backrest support mounting plate ( 31 )—connection rotation axis ( 30 ); the front of backrest support mounting plate ( 31 ) is rotationally connected to string ( 33 )—connection rotation axis ( 32 ); the other end of string ( 33 ) is rotationally connected to chair pedestal assembly ( 4 )—connection rotation axis ( 34 ); string ( 33 ) is additionally rotationally connected to string ( 36 )—connection rotation axis ( 35 ); the other end of string ( 36 ) is rotationally connected to seat mount ( 2 )—connection rotation axis ( 37 ); the chair comprises a mechanism which in the classic sitting position, during backwards inclination of the backrest support ( 5 ) causes backwards inclination of the seat ( 1 ) along with the mechanism and the knee support around axis ( 8 ); the mechanism is constructed in such a manner that the backrest support mounting plate ( 31 ) is rotationally connected to inclination lever ( 58 )—connection rotation axis ( 32 ); one end of the inclination lever ( 58 ) leans on string ( 61 ) and the other end, which may be equipped with a rotating wheel ( 59 ), leans on pusher ( 60 ); inclination lever ( 58 ) is affixed to backrest support ( 5 ). Backrest ( 3 ) is affixed to backrest support ( 5 ); if the seat is dividable the knee support ( 6 ) constitutes an extension of the seat when the chair is arranged in the sitting position; if the seat is not dividable the knee support ( 6 ) is placed under the seat and is moved to the kneeling position during conversion of the chair by means of any mechanism.