Patent ID: 8635723

Claim:
A mechanized bed for automatically straightening bedclothes, comprising: A) a rectangular frame having a mattress and bedclothes said bedclothes having an inferior side, a head end, a foot end and two lateral ends with each end including a longitudinally extending cord at the edge of said lateral ends; B) a bed support member having a base with a plurality of legs housed within said frame and said support member including two opposite facing sides; C) two trapezoidal tracks ( 2 ) interiorly mounted respectively to said two opposite facing sides each track including an upper side with an upper face, an inclined upward side with an inclined upward face, an inclined downward side with an inclined downward face and a lower side with a lower face; D) two moving carriages ( 3 ) mounted to said tracks ( 2 ), each carriage ( 3 ) having a mobile wheel ( 5 ) and a fixed wheel ( 4 ), said mobile wheel ( 5 ) cooperatively rolling against said upper, upward, downward and lower faces and said mobile wheel ( 4 ) rolling against said lower face so that said carriages ( 3 ) move reciprocally and horizontally from one extreme position to another, and said mobile wheels ( 5 ) moving around said tracks ( 2 ) along said upper face and downward face when said carriage moves towards one extreme position and along said lower face and upward face when moving in the opposite direction towards the other extreme position; E) two tensor rods ( 7 ) mounted to said mobile wheels ( 5 ), respectively, and extending upwardly with respective distal ends ( 7 b ) that come in contact with said inferior side of said bedclothes and further including a stepped projection ( 7 a ) for each of said tensor rods defined at a predetermined distance from said distal ends ( 7 b ); F) two spring biased rotating arm assemblies cooperatively mounted to said carriages ( 3 ), respectively, and coacting with said stepped projections ( 7 a ) said arm assemblies being biased against, and come in coact with, said rods ( 7 ) and allowed to rotate 90 degrees after clearing said stepped projection when said mobile wheel ( 5 ) is rolling against said lower face, and said arm assemblies further including each a longitudinally extending craddle for partially and slidably receiving said cord; and G) two pressure rollers ( 10 ) mounted to said rotating arm assemblies, respectively, each of said rollers ( 10 ) having an axis, said rollers being in the at rest position when said rollers' axes are in the vertical position and coacting against said cord when the axes are in the vertical position.