IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0336576
(2003-01-03)
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발명자
/ 주소 |
- Kummer,Joseph A.
- Kappeler,Ronald P.
- Frondorf,Michael M.
- Lubbers,David P.
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
47 인용 특허 :
122 |
초록
A patient support including a propulsion device for moving the patient support. An automatic braking system is provided to selectively brake the patient support.
대표청구항
▼
What is claimed is: 1. A patient support comprising: a frame, a mattress positioned on the frame to provide a patient rest surface, a plurality of wheels configured to provide support of the frame on the floor, a traction device coupled to the frame and configured to provide mobility to the frame;
What is claimed is: 1. A patient support comprising: a frame, a mattress positioned on the frame to provide a patient rest surface, a plurality of wheels configured to provide support of the frame on the floor, a traction device coupled to the frame and configured to provide mobility to the frame; a motor operably coupled to the traction device; a power source coupled to the frame and configured to provide power to the motor; and a controller coupled intermediate the power source and the motor, the controller configured to cause the motor to operate in one of at least two modes, the at least two modes including a driving mode in which the motor drives the traction device in motion and a braking mode in which the motor resists movement of the traction device, wherein the controller causes the motor to operate in the braking mode when power below a predetermined value is available to drive the motor. 2. The patient support of claim 1, wherein the controller causes the motor to operate in the braking mode when voltage applied to the motor is less than approximately 21 volts and current supplied to the motor is less than approximately 5 amps. 3. The patient support of claim 1, further comprising a shut down relay coupled to the power source and configured to disconnect the power source from the motor when the energy stored within the power source is less than a predetermined value. 4. The patient support of claim 3, further comprising a switch coupled to the shut down relay and configured to manually disconnect the power source from the motor independent of the amount of energy stored within the power source. 5. The patient support of claim 1, further comprising a user input device coupled to the controller and configured to generate an input signal, the controller being configured to cause the motor to operate selectively in one of the driving mode and the braking mode in response to the input signal. 6. A patient support comprising: a frame, a mattress positioned on the frame to provide a patient rest surface, a plurality of wheels configured to provide support of the frame on the floor, a traction device coupled to the frame and configured to provide mobility to the frame; a motor operably coupled to the traction device; a power source coupled to the frame and configured to provide power to the motor; a controller coupled intermediate the power source and the motor, the controller configured to cause the motor to operate in one of at least two modes, the at least two modes including a driving mode in which the motor drives the traction device in motion and a braking mode in which the motor resists movement of the traction device wherein the motor includes a pair of power leads and the controller is configured to short the power leads in the braking mode. 7. The patient support of claim 6, wherein the motor comprises a permanent magnet motor and the controller comprises a braking relay. 8. A patient support comprising: a frame, a mattress positioned on the frame to provide a patient rest surface, a plurality of wheels configured to provide support of the frame on the floor, a traction device coupled to the frame and configured to provide mobility to the frame; a motor operably coupled to the traction device; a power source coupled to the frame and configured to provide power to the motor; a controller coupled intermediate the power source and the motor, the controller configured to cause the motor to operate in one of at least two modes, the at least two modes including a driving mode in which the motor drives the traction device in motion and a braking mode in which the motor resists movement of the traction device and an override switch coupled intermediate the controller and the motor, the override switch configured to prevent the controller from placing the motor in the braking mode. 9. The patient support of claim 1, wherein the power source comprises a rechargeable battery. 10. The patient support of claim 1, further comprising a traction engagement controller configured to move the traction device between a first position spaced apart from the floor and a second position in contact with the floor. 11. The patient support of claim 1, wherein the traction device comprises a rotating member operably coupled to the motor. 12. The patient support of claim 11, wherein the traction device further comprises a continuous belt supported by the rotating member. 13. A patient support comprising: a frame; a patient rest surface supported by the frame; a traction device coupled to the frame and configured to provide mobility to the frame; a motor operably coupled to the traction device; a power source supported by the frame and configured to provide power to the motor; and a braking system coupled to the power source and configured to detect power available to drive the motor and to provide braking based upon the power detected. 14. The patient support of claim 13, wherein the braking system causes the motor to operate as an electronic brake when the power detected is below a predetermined value. 15. The patient support of claim 14, wherein the braking system causes the motor to operate as an electronic brake when voltage applied to the motor is less than approximately 21 volts and current supplied to the motor is less than approximately 5 amps. 16. The patient support of claim 13, wherein the motor includes a pair of power leads, the braking system being configured to selectively short the power leads. 17. The patient support of claim 16, wherein the motor comprises a permanent magnet motor and the controller comprises a braking relay. 18. The patient support of claim 13, further comprising an override switch configured to disengage the braking system. 19. The patient support of claim 13, further comprising a shut down relay coupled to the power source and configured to disconnect the power source from the motor when the energy stored within the power source is less than a predetermined value. 20. The patient support of claim 19, further comprising a switch coupled to the shut down relay and configured to manually disconnect the power source from the motor independent of the amount of energy stored within the power source. 21. The patient support of claim 13, further comprising a traction engagement controller configured to move the traction device between a first position spaced apart from the floor and a second position in contact with the floor. 22. The patient support of claim 13, wherein the traction device comprises a rotating member operably coupled to the motor. 23. The patient support of claim 22, wherein the traction device further comprises a continuous belt supported by the rotating member. 24. A transport apparatus comprising: a moveable support frame; a plurality of casters supporting the support frame; a traction device coupled to the support frame; and a braking system configured to detect power available to drive the traction device and further configured to provide braking if the power detected is below a predetermined value. 25. The transport apparatus of claim 24, wherein the braking system includes a controller configured (i) to cause the traction device to operate in a driving mode when the power detected is at least as great as a predetermined value, and (ii) to cause the traction device to operate in a braking mode when the power detected is below the predetermined value. 26. The transport apparatus of claim 25, further comprising a motor having a pair of power leads, wherein the controller is configured to short the power leads if the power detected is below the predetermined value. 27. The transport apparatus of claim 26, wherein the motor comprises a permanent magnet motor and the controller comprises a braking relay. 28. The transport apparatus of claim 24, further comprising an override switch supported by the frame and configured to disengage the braking system. 29. The transport apparatus of claim 24, further comprising a patient rest surface coupled to the frame. 30. A patient support apparatus comprising: a frame; a patient rest surface supported by the frame; a traction device coupled to the frame and configured to provide mobility to the frame; a motor operably coupled to the traction device; a power source coupled to the motor; a brake coupled to the power source and selectively activated based upon the power available to drive the motor; and an override switch supported by the frame and configured to disengage the brake. 31. The patient support apparatus of claim 30, further comprising a controller intermediate the power source and the motor for detecting power available to drive the motor. 32. The patient support apparatus of claim 31, wherein the motor operates as an electronic brake when the power detected by the controller is below a predetermined value. 33. The patient support apparatus of claim 32, wherein the motor includes a pair of power leads, the controller being configured to selectively short the power leads when the power detected is below the predetermined value. 34. The patient support apparatus of claim 33, wherein the motor comprises a permanent magnet motor and the controller comprises a relay. 35. The patient support apparatus of claim 32, further comprising a shut down relay coupled to the power source and configured to disconnect the power source from the motor when the energy stored within the power source is less than a predetermined value. 36. The patient support apparatus of claim 34, further comprising a switch coupled to the shut down relay and configured to manually disconnect the power source from the motor independent of the amount of energy stored within the power source. 37. The patient support apparatus of claim 30, wherein the power source comprises a rechargeable battery. 38. The patient support apparatus of claim 30, further comprising a traction engagement controller configured to move the traction device between a first position spaced apart from the floor and a second position in contact with the floor. 39. The patient support apparatus of claim 30, wherein the traction device comprises a rotating member operably coupled to the motor. 40. The patient support apparatus of claim 39, wherein the traction device further comprises a continuous belt supported by the rotating member. 41. A patient support apparatus comprising: a frame; support means for supporting a patient and coupled to the frame; propulsion means for providing mobility to the frame; power supply means for supplying power to the propulsion means; and braking means for selectively providing braking to the patient support based upon power available to drive the propulsion means. 42. The patient support apparatus of claim 41, wherein the propulsion means comprises a motor driven by the power supply means, and the braking means comprises a controller intermediate the power supply means and the motor for detecting power available to drive the motor, the controller causing the motor to operate as an electronic brake when the power detected is below a predetermined value. 43. The patient support apparatus of claim 42, wherein the motor includes a pair of power leads, the controller being configured to short the power leads when the power detected is below the predetermined value. 44. The patient support apparatus of claim 43, wherein the motor comprises a permanent magnet motor and the controller comprises a braking relay. 45. The patient support apparatus of claim 42, further comprising an override switch configured to disengage the braking means. 46. The patient support apparatus of claim 41, further comprising means for disconnecting the power source from the motor when the energy stored within the power source is less than a predetermined value. 47. The patient support apparatus of claim 46, wherein the means for disconnecting comprises a shut down relay coupled to the power source. 48. A patient support apparatus comprising: a frame; a patient rest surface supported by the frame; a plurality of wheels configured to support the frame on the floor; a traction device coupled to the frame and configured to provide mobility to the frame, the traction device being configured to move relative to the frame between a first position spaced apart from the floor and a second position in contact with the floor; a motor operably coupled to the traction device, the motor being configured to operate in a driving mode of operation for facilitating movement of the traction device and a braking mode of operation for resisting movement of the traction device; and an override switch operably coupled to the motor and configured to remove the motor from the braking mode of operation. 49. The patient support apparatus of claim 48, further comprising a power source configured to provide power to the motor. 50. The patient support apparatus of claim 49, further comprising a controller coupled to the power source and to the motor, the controller being configured to cause the motor to operate in the braking mode of operation when power below a predetermined value is available to drive the motor. 51. The patient support apparatus of claim 50, wherein the motor includes a pair of power leads, the controller being configured to selectively short the power leads when the power detected is below the predetermined value. 52. The patient support apparatus of claim 51, wherein the motor comprises a permanent magnet motor and the controller comprises a relay. 53. The patient support apparatus of claim 49, wherein the power source comprises a rechargeable battery. 54. The patient support apparatus of claim 48, further comprising a traction engagement controller configured to move the traction device between the first position spaced apart from the floor and the second position in contact with the floor. 55. The patient support of claim 6, wherein the controller causes the motor to operate in the braking mode when power below a predetermined value is available to drive the motor. 56. The patient support of claim 55, wherein the controller causes the motor to operate in the braking mode when voltage applied to the motor is less than approximately 21 volts and current supplied to the motor is less than approximately 5 amps. 57. The patient support of claim 55, further comprising a shut down relay coupled to the power source and configured to disconnect the power source from the motor when the energy stored within the power source is less than a predetermined value. 58. The patient support of claim 57, further comprising a switch coupled to the shut down relay and configured to manually disconnect the power source from the motor independent of the amount of energy stored within the power source. 59. The patient support of claim 6, further comprising a user input device coupled to the controller and configured to generate an input signal, the controller being configured to cause the motor to operate selectively in one of the driving mode and the braking mode in response to the input signal. 60. The patient support of claim 6, wherein the motor comprises a permanent magnet motor and the controller comprises a braking relay. 61. The patient support of claim 6, further comprising an override switch coupled intermediate the controller and the motor, the override switch configured to prevent the controller from placing the motor in the braking mode. 62. The patient support of claim 6, wherein the power source comprises a rechargeable battery. 63. The patient support of claim 6, further comprising a traction engagement controller configured to move the traction device between a first position spaced apart from the floor and a second position in contact with the floor. 64. The patient support of claim 6, wherein the traction device comprises a rotating member operably coupled to the motor. 65. The patient support of claim 64, wherein the traction device further comprises a continuous belt supported by the rotating member.
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