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A medical cart includes a cart body, a top platform, and an elevating device. The elevating device is mounted on the cart body for supporting the top platform above the cart body and is for moving the top platform upwardly and downwardly. The elevating device includes a sleeve, a screw rod, a motor

A medical cart includes a cart body, a top platform, and an elevating device. The elevating device is mounted on the cart body for supporting the top platform above the cart body and is for moving the top platform upwardly and downwardly. The elevating device includes a sleeve, a screw rod, a motor and a motor driving module. The screw rod extends through the sleeve and engages threadedly a threaded inner surface of the sleeve. The motor is connected to the screw rod and is for driving the screw rod to rotate and move with respect to the sleeve, such that the top platform is driven by the screw rod to move upwardly and downwardly with respect to the cart body.

대표청구항 ▼

1. A medical cart comprising: a cart body;a top platform; anda mechatronics unit including an elevating device that is mounted on said cart body for supporting said top platform above said cart body and that is operable to move said top platform upwardly and downwardly with respect to said cart body

1. A medical cart comprising: a cart body;a top platform; anda mechatronics unit including an elevating device that is mounted on said cart body for supporting said top platform above said cart body and that is operable to move said top platform upwardly and downwardly with respect to said cart body, said elevating device includinga sleeve mounted on said cart body and having a threaded inner surface,a screw rod extending through said sleeve and engaging threadedly said threaded inner surface,a first motor connected to said screw rod, and operable to drive said screw rod to rotate and move with respect to said sleeve, said top platform being driven by said screw rod to move upwardly and downwardly with respect to said cart body,a first motor driving module electrically connected to said first motor, and operable to output a first driving signal thereto for driving operation of said first motor, and a first control module electrically connected to said first motor driving module, and operable to control operation of said first motor driving module to output the first driving signal in response to user input of one of a lifting signal and a lowering signal that are indicative of upward movement and downward movement of said top platform, respectively; wherein said first control module is operable to output a first control signal and a second control signal for controlling said first motor driving module, said first motor driving module including: a first switch and a second switch connected to each other in series, each of said first and second switches being operable, in response to a respective one of the first and second control signals, to switch between conducting and non-conducting states, a common node between said first and second switches being electrically connected to one terminal of said first motor;a third switch and a fourth switch connected to each other in series, each of said third and fourth switches being operable, in response to a respective one of the second and first control signals, to switch between conducting and non-conducting states, a common node between said third and fourth switches being electrically connected to another terminal of said first motor;a first speed-up capacitor and a first base resistor connected to each other in parallel, said first speed-up capacitor including a first end for receiving the first control signal and a second end coupled to said first switch for decreasing switching time of said first switch between the conducting and non-conducting states,a second speed-up capacitor and a second base resistor connected to each other in parallel, said second speed-up capacitor including a first end for receiving the second control signal and a second end coupled to said third switch for decreasing switching time of said third switch between the conducting and non-conducting states;a first inverting circuit electrically connected between said first switch and said second end of said first speed-up capacitor; anda second inverting circuit electrically connected between said third switch and said second end of said second speed-up capacitor. 2. The medical card as claimed in claim 1, wherein said first motor driving module further includes: a first delay circuit for receiving the second control signal and for delaying output of the second control signal to said second switch, said first delay circuit includinga first delay resistor and a first free-wheeling diode connected to each other in parallel, said first delay resistor having a first end for receiving the second control signal, and a second end,a first delay transistor and a first resistor electrically connected to each other in series and between said second end of said first delay resistor and ground, a common node between said first delay transistor and said first resistor being electrically connected to said second switch, anda first delay capacitor electrically connected between said second end of said first delay resistor and the ground, and having a capacitance related to the second control signal; anda second delay circuit for receiving the first control signal and for delaying output of the first control signal to said fourth switch, said second delay circuit including a second delay resistor and a second free-wheeling diode connected to each other in parallel, said second delay resistor having a first end for receiving the first control signal, and a second end,a second delay transistor and a second resistor electrically connected to each other in series and between said second end of said second delay resistor and the ground, a common node between said second delay transistor and said second resistor being electrically connected to said fourth switch, anda second delay capacitor electrically connected between said second end of said second delay resistor and the ground, and having a capacitance related to the first control signal. 3. The medical cart as claimed in claim 1, wherein said mechatronics unit further includes: a man-machine interface device including a user-operation module for outputting an operation signal, the lifting signal and the lowering signal in response to user operation,a control module coupled to said user-operation module for outputting a display signal in response to receipt of the operation signal, and a display disposed on said top platform and coupled to said control module for receiving the display signal to display information accordingly. 4. The medical cart as claimed in claim 3, wherein said top platform includes a medicine chest, and said mechatronics unit further includes: an electronic-controlled lock device including a lock for locking said medicine chest,a second motor connected to said lock and operable to lock and unlock said lock,a second motor driving module electrically connected to said second motor, and operable to output a second driving signal thereto for driving operation of said second motor, anda second control module electrically connected to said control module of man-machine interface device and said second motor driving module, and operable to control operation of said second motor driving module to output the second driving signal according to a lock control signal, which is outputted by said control module according to the operation signal. 5. The medical cart as claimed in claim 4, wherein said first control module is further operable, in response to receipt of the lock control signal from said control module for unlocking said lock, to enable said first motor driving module to stop said first motor. 6. The medical cart as claimed in claim 3, wherein said elevating device further includes a detection circuit that is electrically connected to said first control module, and that is operable to detect a position of said screw rod and to output a limit signal to said first control module when said screw rod is at a limited position, wherein said first control module is further operable, in response to receipt of the limit signal,to enable said first motor driving module to stop said first motor, andto output a limited position signal to said control module which is operable to output the display signal according to the limited position signal to said display for displaying the information about the limited position.