Chair type stretching apparatus

Abstract

A chair type stretching apparatus in this invention comprises a seat, a backrest, a flexible sheet, a tension means, and a controller. The flexible sheet is disposed on a top of the seat to extend an entire width of the seat. The tension means is provided on the seat and is configured to apply tensional force to the flexible sheet so as to move a center of the flexible sheet toward an upper direction of the seat. The controller is configured to control the tension means in order to move the center of the flexible sheet to a vertical direction. The tension means is provided on at least one width end of the seat in order to apply the tensional force along a width direction of the seat to the flexible sheet, whereby the tension means moves the center of the flexible sheet to the vertical direction.

1 . A chair type stretching apparatus having a seat and a backrest which respectively have individual widths along a width of a user's body, and a depth, said stretching apparatus comprising:
 a flexible sheet being disposed on a top of said seat to extend an entire width of said seat for supporting the user's buttocks, said flexible sheet being configured to be movable between a normal position and a projected position, said flexible sheet in said normal position lying in a close relation with a top surface of said seat, said flexible sheet in said projected position is spaced away from said top surface of said seat,   a tension means being provided on said seat and being configured to apply tensional force to said flexible sheet so as to move a center of said flexible sheet toward an upper direction of the seat,   a controller being configured to control said tension means in order to move said center of said flexible sheet to a vertical direction,   
       wherein 
       said tension means is provided on at least one width end of said seat in order to apply the tensional force along a width direction of the seat to said flexible sheet, whereby the tension means moves the center of the flexible sheet to the vertical direction. 
     
     
         2 . The stretching apparatus as set forth in  claim 1 , wherein
 said tension means is defined by a pressurizing means being configured to apply pressure along the upper direction of the seat to the flexible sheet, said pressurizing means is located between the seat and the flexible sheet, thereby moving said center of said flexible sheet toward the upper direction,   said controller being configured to control said pressurizing means so as to move said center of said flexible sheet along the vertical direction of the seat,   said pressurizing means being disposed to both width ends of the seat in order to apply the pressure toward the upper direction of the seat to said flexible sheet, whereby said pressurizing means moving said center of said flexible sheet toward the upper direction with respect to the seat.   
     
     
         3 . The stretching apparatus as set forth in  claim 2 , wherein
 said flexible sheet has a front end which is fixed to a front end of said seat, and   said flexible sheet has a rear end which is attached to a rear end of said seat to be movable in the vertical direction of said seat.   
     
     
         4 . The stretching apparatus as set forth in  claim 2 , wherein
 said flexible sheet is made of a hard foamed material.   
     
     
         5 . The stretching apparatus as set forth in  claim 2 , wherein
 said flexible sheet and said pressurizing means are detachably attached to said seat.   
     
     
         6 . The chair type stretching apparatus as set forth in  claim 5  further comprises a stretching unit which is detachably attached to said top surface of said seat,
 said stretching unit being provided at its top surface with said flexible sheet, and being provided at its width ends of an inside of said stretching unit with said pressurizing means so that said flexible sheet and said pressurizing means are detachably attached to said backrest.   
     
     
         7 . The stretching apparatus as set forth in  claim 2 , wherein
 said flexible sheet has width ends which are respectively attached to both width surfaces of said seat, and   at least one of said width ends of said flexible sheet being detachably attached to a predetermined area of said width surface of said seat.   
     
     
         8 . The stretching apparatus as set forth in  claim 2 , wherein
 said pressurizing means is composed of air-bags and a pump,   said air-bags being configured to expand and contract toward the vertical direction of said seat, and   said pump being configured to send air to said air-bag.   
     
     
         9 . A stretching apparatus as set forth in  claim 1  further comprises a wall,
 said wall being located between said seat and said flexible sheet, and being located at one width end of said top surface of said seat,   said tension means being defined by a pressurizing means being configured to apply pressure along the upper direction of the seat to said flexible sheet, said tension means being located between said seat and said flexible sheet so as to move said center of said flexible sheet,   said controller being configured to control said pressurizing means in order to move said center of said flexible sheet toward said vertical direction of said seat,   said pressurizing means being located at one width end of said seat and being located away from said wall, said pressurizing means being configured to apply the pressure along the upper direction of said seat to one end of said flexible sheet so that said pressurizing means applies the tensional force directed outwardly of a width direction to said flexible sheet.   
     
     
         10 . The stretching apparatus as set forth in  claim 1  further comprises walls,
 said walls are located between said seat and said flexible sheet, and being located at both width ends of said top surface of said seat,   said tension means is defined by rollers,   said rollers respectively holding width ends of said flexible sheet, and are configured to wrap said flexible sheet around said rollers so as to move said center of said flexible sheet toward the upper direction of said seat,   said controller being configured to control said rollers in order to move said center of said flexible sheet to the vertical direction,   said rollers being disposed at both the width surfaces of said seat, and being configured to wrap said flexible sheet in order to apply the tensional force directed outwardly of a width direction to said flexible sheet, whereby the rollers moves the center of the flexible sheet toward the upper direction.