Electric foldable bed capable of adjusting to a predetermined position by detecting the number of rotations of a motor

Abstract

An electric foldable bed capable of being adjusted to a memorized position has a fold bed having motors connected to a headboard and a footboard. A microcomputer is installed on the bed frame and used for controlling the motors. The microcomputer has a computing section, a memory section, a register section and a comparing section. The computing section detects a position of each motor and computes elevation angle data provided by the memory section, the register section and the comparing section. The memory section is used to store predetermined elevation angle data, the register section is used to receive control commands and store the elevation angle data input by the computing section. The comparing section is used for comparing the elevation angle data from both the memory section and the register section. The sensor is installed onto each motor and used for sensing a rotational number count of the motor.

1 . An electric foldable bed capable of adjusting to a predetermined position by detecting the number of rotations of a motor, comprising:
 a folding bed having a bed frame pivoted with a headboard and a footboard at opposite ends, and at least two motors attached to an underside of the bed frame, the motors being connected to the headboard and the footboard and generating respective elevation angle changes;   a microcomputer disposed on the bed frame and used for controlling the motors, the microcomputer comprising a computing section, a memory section, a register section and a comparing section, the computing section detecting a position of the motors and computing elevation angle data provided by the memory section, the register section and the comparing section, the memory section being used to predetermined elevation angle data, the register section receiving control commands and storing the elevation angle data input by the computing section, the comparing section used for comparing the elevation angle data from both the memory section and the register section;   a sensor installed onto each motor and used for sensing a rotating number count of the motor and transmitting a serial pulse wave signal to the computing section of the microcomputer; and   a controller used for inputting the control command and transmitting signals to the register section of the microcomputer.   
     
     
         2 . The electric foldable bed as claimed in  claim 1 , wherein the folding bed further includes an extension board pivoted to a free end of the footboard, which is capable of forming a triangle with two elevation angles with the footboard. 
     
     
         3 . The electric foldable bed as claimed in  claim 1 , wherein each motor further comprises a limit switch, wherein when the headboard or the footboard is lowered to effectively no elevation angle, the respective limit switch is activated to stop the motor and sets this position as a start position for the respective elevation angle data. 
     
     
         4 . An electric foldable bed capable of adjusting to a predetermined position by detecting the number of rotations of a motor, comprising:
 a folding bed having a bed frame pivoted with a headboard and a footboard at opposite ends, and at least two motors attached to an underside of the bed frame, the motors being connected to the headboard and the footboard and generating respective elevation angle changes;   a microcomputer disposed on the bed frame and used for controlling the motors, the microcomputer comprising computing means, memory means, a register section and comparing means, the computing means detecting a position of the motors and computing elevation angle data provided by the memory means, the register section and the comparing means, the memory means being used to predetermined elevation angle data, the register section receiving control commands and storing the elevation angle data input by the computing means, the comparing means comparing the elevation angle data from both the memory means and the register section;   a sensor installed onto each motor and used for sensing a rotating number count of the motor and transmitting a serial pulse wave signal to the computing means of the microcomputer; and   a controller used for inputting the control command and transmitting signals to the register section of the microcomputer.   
     
     
         5 . The electric foldable bed as claimed in  claim 1 , wherein the folding bed further includes an extension board pivoted to a free end of the footboard, which is capable of forming a triangle with two elevation angles with the footboard. 
     
     
         6 . The electric foldable bed as claimed in  claim 1 , wherein each motor further comprises a limit switch, wherein when the headboard or the footboard is lowered to effectively no elevation angle, the respective limit switch is activated to stop the motor and sets this position as a start position for the respective elevation angle data. 
     
     
         7 . A method of adjusting a predetermined position of electric foldable bed, comprising steps of:
 a) preparing an electric foldable bed having a folding bed, a microcomputer, sensors, and a controller, the folding bed having a bed frame, a headboard, a footboard, and two motors attached to an underside of the bed frame, the motors being connected to the headboard and the footboard for generating respective elevation angle changes, each of the motors having a plurality of limit switches corresponding to the headboard and the footboard, the microcomputer having a computing section, a memory section, a register section, and a comparing section, the memory section being adapted for storing predetermined elevation angle data, the sensors being adapted for sending a rotating number count of the motor and transmitting a serial pulse wave signal to the microcomputer;   b) lowering the headboard or the footboard to effectively no elevation angle to activate the respective limit switch to stop the motor and set this position as a start position for, the respective elevation angle data;   c) inputting preferred elevation angle data of the user's preferred position into the microcomputer via the controller; next, the microcomputer inputs it into the register section for storage, the comparing section compares both the elevation angle data from the memory section and the register section to obtain a relative distance between the predetermined elevation angle data and the preferred elevation angle data, and finally the microcomputer inputs it into the computing section to calculate the number of rotations of the motor; and   d) controlling the respective motors to lift up the headboard or the footboard according to the number of rotations of the motor for reaching the user's customized elevation angle.