Elevation chair

Abstract

An elevation chair having a seat which is elevated by a driving mechanism, provided with a seat frame and a seat main body attached to the frame as to incline forward, the seat main body has an oscillation mechanism to automatically incline the seat main body forward at a predetermined height, and an angle detecting means to stop the driving mechanism when the seat main body reaches a predetermined inclination angle. And, the elevation chair has an automatic braking mechanism which releases wheels when a footrest attached to a position above a front wheel is laid to be horizontal, and brakes the wheel when the footrest is standing.

1  (cancel).  
     
     
         2  An elevation chair having a seat ascended and descended by a driving mechanism, comprising a seat main body to which the seat is attached to a seat frame and a forth end portion of the seat frame as to incline forward, an oscillation mechanism which inclines the seat main body automatically at a predetermined height, and an angle detecting means which stops the driving mechanism when the seat main body reaches a predetermined inclination angle, wherein the oscillation mechanism has a non-inclination switching mechanism which interrupts the automatic forward inclination at the predetermined height and elevates the seat kept horizontal.  
     
     
         3  (cancel).  
     
     
         4  An elevation chair having a seat ascended and descended by a driving mechanism, comprising a seat main body to which the seat is attached to a seat frame and a forth end portion of the seat frame as to incline forward, an oscillation mechanism which inclines the seat main body automatically at a predetermined height, and an angle detecting means which stops the driving mechanism when the seat main body reaches a predetermined inclination angle, wherein the angle detecting means is provided with a shielding plate attached to the seat main body, and a photosensor attached to the seat frame to detect the inclination angle of the seat main body through a position of the shielding plate which inclines along with the seat main body.  
     
     
         5  (cancel).  
     
     
         6  An elevation chair having a seat ascended and descended by a driving mechanism, comprising a seat main body to which the seat is attached to a seat frame and a forth end portion of the seat frame as to incline forward, and an oscillation mechanism which inclines the seat main body automatically at a predetermined height, in which the driving mechanism is provided with an sliding member connected to the seat and elevatable, an expansion actuator which expands and contracts in up-and-down direction, a running rotation pulley disposed on an upper end of the expansion actuator, and a flexible member, of which one end is attached to a lower fixation portion, extending upward and suspended on the running rotation pulley, and of which another end is attached to the sliding member.  
     
     
         7  The elevation chair as set forth in  claim 6 , wherein the flexible member is a flexible belt, the flexible belt is a double belt composed of an outer belt and an inner belt, the outer belt is suspended on the lower fixation portion, the running rotation pulley, and the sliding member untensed in a normal state, and the outer belt is tensed to suspend the sliding member for retaining the position in an emergency in which the inner belt is cut.  
     
     
         8  The elevation chair as set forth in  claim 7 , wherein a position-corresponding plate is disposed between the outer belt and the inner belt as to be pressed to the outer belt, the outer belt is tensed to suspend the sliding member for retaining the position in an emergency in which the inner belt is cut, and the position-corresponding plate is moved as a displacement detecting mechanism, connected to the position-corresponding plate, stops the driving mechanism.  
     
     
         9  The elevation chair as set forth in  claim 6 ,  7 , or  8 , wherein: 
 the oscillation mechanism has an elevation pulley attached to the sliding member ascended and descended by the driving mechanism, a middle deflection shaft, a hook with a deflection shaft hitched to a hitching protruding portion of a post standing on the lower fixation portion, and a suspension belt, of which one end portion is connected to a rear end portion of the seat main body as to suspend, extending upward and suspended on the elevation pulley, then suspended on the middle deflection shaft, extending downward and suspended on the hook with the deflection shaft, and of which another end portion is attached to an upper part of the post; and  
 the suspension belt is disposed between the middle deflection shaft and the hook with the deflection shaft as to work as a stopper to hitch the hook with the deflection shaft with tensile force in the post side.  
 
     
     
         10  The elevation chair as set forth in  claim 9 , wherein the oscillation mechanism is provided with a non-inclination switching mechanism, in which plural hitching protruding portions are formed on the post to change hitching height position of the hook with the deflection shaft, to interrupt the automatic forward inclination of the seat main body at the predetermined height and elevate the seat kept horizontal.  
     
     
         11  The elevation chair as set forth in  claim 10 , wherein the oscillation mechanism is provided with an adjustment mechanism, in which plural hitching protruding portions are formed on the post to change hitching height position of the hook with the deflection shaft, to change the height at which the forward inclination starts.  
     
     
         12  An elevation chair having a seat ascended and descended by a driving mechanism, comprising a horizontal leg portion composed of a rear fixation portion and a front oscillation arm portion constructed as the oscillation arm portion is attached to the fixation portion at a base end portion of the oscillation arm portion as to be freely switched between a forward-protruding used state and an upward-folded stored state, and an auxiliary wheel on the base end portion of the oscillation arm portion protrudes downward to contact a ground in the stored state.  
     
     
         13  The elevation chair as set forth in  claim 12 , wherein the seat is freely switched between a horizontal used state and an upright stored state, and an armrest is disposed on both of left and right sides above the seat as to be freely switched between a horizontal used state and an upright stored state.  
     
     
         14 - 16  (cancel).