[특허]Energy storage on an elevated platform and transfer method

The Raymond Corporation

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Energy storage on an elevated platform and transfer method

국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B66F-009/075
미국특허분류(USC)	187/222;
출원번호	US-0714977 (2010-03-01)
등록번호	US-8689943 (2014-04-08)
발명자 / 주소	McCabe, Paul P.
출원인 / 주소	The Raymond Corporation
대리인 / 주소	Quarles & Brady LLP
인용정보	피인용 횟수 : 0 인용 특허 : 12

초록
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A lift truck includes a secondary rechargeable energy storage device on a vertically movable platform that is separate from a primary rechargeable energy storage device on the lift truck's main tractor unit without the use of wires or hoses for transfer of power or controls between the main tractor unit and the platform. The quantity of energy stored in the secondary rechargeable energy storage device is sufficient to power platform electrical loads for a predetermined amount of time until the platform is lowered. When the platform is lowered, the second...

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1. A lift truck comprising: a tractor unit;a primary energy storage device disposed on the tractor unit, the primary energy storage device adapted to provide operating power to the tractor unit;a vertically movable platform mounted relative to the tractor unit, the platform being vertically movable between an upper position and a lower position;a rechargeable secondary energy storage device disposed on the platform, the rechargeable secondary energy storage device being rechargeable upon moving the platform toward the lower position;an energy transfer control circuit adapted to sense a voltage potential difference between the primary energy storage device and the rechargeable secondary energy storage device;a primary side sensor circuit and a secondary side target, such that when the primary side sensor circuit and secondary side target are aligned, a transfer coupling sense circuit indicates an aligned condition to the energy transfer control circuit; andthe rechargeable secondary energy storage device including at least one capacitor, the at least one capacitor adapted to accept an energy transfer from the primary energy storage device and temporarily store the energy transfer, the rechargeable secondary energy storage device further including a DC-to-DC voltage converter, the voltage converter adapted to convert a voltage from the at least one capacitor to a recharge voltage to recharge the rechargeable secondary energy storage device,wherein the at least one capacitor is electrically connected between the primary energy storage device and the DC-to-DC voltage converter when the primary side sensor circuit and the secondary side target are aligned such that the DC-to-DC voltage converter does not directly connect to the primary energy storage device. 2. The lift truck according to claim 1: further including an energy transfer coupling, the energy transfer coupling adapted to transfer energy from the primary energy storage device to the rechargeable secondary energy storage device to recharge the rechargeable secondary energy storage device. 3. The lift truck according to claim 2: wherein the primary energy storage device comprises a rechargeable device. 4. The lift truck according to claim 3: wherein the energy transfer coupling is adapted to transfer energy from the secondary energy storage device to the primary energy storage device. 5. The lift truck according to claim 3: wherein the energy transfer coupling is adapted to transfer energy from the secondary energy storage device to the primary energy storage device so as to recharge the primary storage device. 6. The lift truck according to claim 2: wherein the energy transfer coupling comprises at least one of a physical coupling and an inductive coupling. 7. The lift truck according to claim 1: further including a operator station, the operator station including controls adapted for use by the operator to control the tractor unit and the platform. 8. The lift truck according to claim 1: wherein the tractor unit includes a first wireless communication unit and the platform includes a second wireless communication unit, the first and second wireless communication units adapted to provide a wireless communication link between the tractor unit and the platform. 9. The lift truck according to claim 8: further including an operator station, the operator station including controls adapted for use by the operator to control the tractor unit and the platform via the first and second wireless communications units. 10. The lift truck according to claim 1: further including a vertically extendable mast mounted relative to the tractor unit, the mast including a fixed base and an extendable mast section; andthe platform attached to the extendable mast section, the platform being vertically movable with the extendable mast section between the upper position and the lower position. 11. The lift truck according to claim 1: wherein the voltage converter stops charging the rechargeable secondary energy storage device when the voltage from the at least one capacitor reaches a predetermined level. 12. The lift truck according to claim 1: wherein the rechargeable secondary energy storage device includes at least one capacitor and at least one battery, the at least one capacitor adapted to accept an energy transfer from the primary energy storage device and temporarily store the energy transfer, the rechargeable secondary energy storage device further including a DC-to-DC voltage converter, the voltage converter adapted to convert a voltage from the at least one capacitor to a recharge voltage to recharge the at least one battery. 13. A lift truck comprising: a tractor unit;a rechargeable primary energy storage device disposed on the tractor unit,a vertically movable platform mounted relative to the tractor unit, the platform being vertically movable between an upper position and a lower position;a rechargeable secondary energy storage device disposed on the platform;an energy transfer control circuit adapted to sense a voltage potential difference between the primary energy storage device and the rechargeable secondary energy storage device;a primary side sensor circuit and a secondary side target, such that when the primary side sensor circuit and secondary side target are aligned, a transfer coupling sense circuit indicates an aligned condition to the energy transfer control circuit;an energy transfer coupling, the energy transfer coupling adapted to transfer energy from the rechargeable primary energy storage device on the tractor unit to the rechargeable secondary energy storage device on the platform to recharge the rechargeable secondary energy storage device, the energy transfer coupling including at least one capacitor and a voltage converter; andwherein the at least one capacitor is electrically connected between the primary energy storage device and the voltage converter when the primary side sensor circuit and the secondary side target are aligned such that the voltage converter does not directly connect to the primary energy storage device. 14. The lift truck according to claim 13: further including a vertically extendable mast mounted relative to the tractor unit, the mast including a fixed base and an extendable mast section; andthe platform attached to the extendable mast section, the platform being vertically movable with the extendable mast section between the upper position and the lower position. 15. The lift truck according to claim 13: wherein the energy transfer coupling is adapted to transfer energy from the rechargeable primary energy storage device on the tractor unit to the rechargeable secondary energy storage device on the platform to recharge the rechargeable secondary energy storage device when the voltage potential is sensed.

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Energy storage on an elevated platform and transfer method

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Energy storage on an elevated platform and transfer method

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