Patent ID: 8241165

Claim:
A seat lifting assembly comprising: a lifting means ( 1 ) at one end of the seat lifting assembly; an arrangement of shafts along a length of the seat lifting assembly, said arrangement comprising: an output shaft ( 5 ), and a cam shaft ( 14 ) coupled with said output shaft ( 5 ); an assembly of gears supported by said arrangement of shafts for transmitting motion from said lifting means ( 1 ), said assembly of gears comprising: a first gear ( 6 ) provided with a plurality of teeth ( 62 ) on its periphery; a second gear ( 13 ) placed next to said first gear ( 6 ), said second gear provided with a plurality of teeth ( 132 ) embossed concentrically over the second gear; a third gear ( 15 ) placed next to said second gear ( 13 ) being a stepped gear, said third gear comprising a base and a raised step and having: a plurality of teeth ( 152 ) provided on a periphery of the base of said third gear for engaging with said teeth ( 132 ) of said second gear ( 13 ), and a plurality of teeth ( 153 ) provided on a periphery of the raised step; a fourth gear ( 16 ) placed next to the third gear ( 15 ) being a gear having an outer brim and a stepped inner portion with a central hole ( 161 ), said fourth gear comprising: a plurality of teeth ( 162 ) on the inner periphery of the brim part for engaging with said teeth ( 153 ) of said third gear ( 15 ); a link ( 17 ) placed next to said fourth gear ( 16 ) for transmitting motion from the assembly of gears to a seat; wherein, when said lifting means ( 1 ) is pushed or pulled, the first gear ( 6 ) rotates, which in turn provides rotary motion to the arrangement of shafts, thereby eccentrically rotating the third gear ( 15 ) such that said teeth ( 152 ) of the third gear ( 15 ) engage with said teeth ( 132 ) of the second gear ( 13 ) and said teeth ( 153 ) of the third gear ( 15 ) engage with said teeth ( 162 ) of the fourth gear ( 16 ) and provides a controlled motion to the fourth gear ( 16 ), from where the motion is transferred to the link ( 17 ), thus, lowering or raising the height of the seat.