IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
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| 국제특허분류(IPC7판) |
|
| 출원번호 |
US-0688540
(2000-10-16)
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발명자
/ 주소 |
- Heimbrock, Richard H.
- Turner, Jonathan D.
- Hamberg, Stephen R.
- Manlove, D. Scott
- Smith, Donald E.
- Zerhusen, Robert Mark
|
| 출원인 / 주소 |
|
| 대리인 / 주소 |
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| 인용정보 |
피인용 횟수 :
33 인용 특허 :
18 |
초록
▼
A mechanism for initiating movement of a stretcher includes a drive wheel, and a lever or pedal actuated assembly. Moving the pedal or the lever moves a flexible drive link which is wound around a hub of the drive wheel. As the flexible drive link is pulled and unwound from the hub, the drive wheel
A mechanism for initiating movement of a stretcher includes a drive wheel, and a lever or pedal actuated assembly. Moving the pedal or the lever moves a flexible drive link which is wound around a hub of the drive wheel. As the flexible drive link is pulled and unwound from the hub, the drive wheel engages the floor and rotates a sufficient distance to overcome inertia and align the swivel wheels of the stretcher in the desired direction.
대표청구항
▼
A mechanism for initiating movement of a stretcher includes a drive wheel, and a lever or pedal actuated assembly. Moving the pedal or the lever moves a flexible drive link which is wound around a hub of the drive wheel. As the flexible drive link is pulled and unwound from the hub, the drive wheel
A mechanism for initiating movement of a stretcher includes a drive wheel, and a lever or pedal actuated assembly. Moving the pedal or the lever moves a flexible drive link which is wound around a hub of the drive wheel. As the flexible drive link is pulled and unwound from the hub, the drive wheel engages the floor and rotates a sufficient distance to overcome inertia and align the swivel wheels of the stretcher in the desired direction. 1. A hybrid amplifier and regenerator (HAR) device for use in a communications network for carrying downstream traffic in a forward frequency band and for carrying digital upstream traffic in a reverse frequency band spaced from the forward frequency band and below the forward frequency band, the hybrid amplifier and regenerator (HAR) device comprising: an analog amplifier for amplifying said downstream traffic; and a digital regenerator, wherein said digital regenerator comprises: mapping circuitry for mapping digital upstream traffic carried in at least one ramp band which is part of the reverse frequency band to digital upstream traffic carried in at least one express band which is also part of the reverse frequency band but spaced from the at least one ramp band, wherein the at least one express band transports upstream traffic at a substantially higher data rate as compared to the at least one ramp band so that upstream traffic originating from a plurality of sources can be aggregated from the at least one ramp band into the at least one express band; and an express band transmitter for transmitting digital upstream traffic from the mapping circuitry in the at least one express band. 2. A hybrid amplifier and regenerator (HAR) device according to claim 1, wherein said mapping circuitry uses digital time division multiplexing to map the digital upstream traffic carried in said at least one ramp band to the digital upstream traffic carried in said at least one express band. 3. A hybrid amplifier and regenerator (HAR) device according to claim 2, wherein there are a plurality of ramp bands and only one express band. 4. A hybrid amplifier and regenerator (HAR) device according to claim 2, wherein there are a plurality of express bands and only one ramp band. 5. A hybrid amplifier and regenerator (HAR) device according to claim 2, wherein there are only one ramp band and one express band. 6. A hybrid amplifier and regenerator (HAR) device according to claim 5, wherein said mapping circuitry comprises: a diplex filter to separate the digital upstream traffic carried in the ramp band from the digital upstream traffic carried in the express band; a ramp band receiver to detect the digital upstream traffic carried in the ramp band, said ramp band receiver being connected to the diplex filter; an express band receiver to detect the digital upstream traffic carried in the express band, said express band receiver being connected to the diplex filter; a time slot manager for mapping the digital upstream traffic carried in the ramp band from the ramp band receiver to the digital upstream traffic carried in the express band from the express band receiver, said time slot manager being connected to the ramp band receiver and the express band receiver; and a control unit for controlling the mapping of the digital upstream traffic carried in the ramp band to the digital upstream traffic carried in the express band, said control unit being connected to the time slot manager, the ramp band receiver and the express band receiver. 7. A hybrid amplifier and regenerator (HAR) device according to claim 1 further comprising a reverse secondary analog amplifier for amplifying upstream traffic carried in at least one general upstream band which is part of the reverse frequency band but spaced from the at least one ramp band and the at least one express band. 8. A hybrid amplifier and regenerator (HAR) device according to claim 7, wherein the reverse secondary analog amplifier comprises: a diplex or a triplex filter to separate the upstream traffic carried in the at least one general band from the upstream traffic carried in the at least one ramp band and the at least one express band; and an analog amplifier for amplifying the upstream traffic carried in at least one general upstream band. 9. A hybrid amplifier and regenerator (HAR) according to claim 7, wherein said at least one general frequency band comprises a first gener al frequency band and a second general frequency band. 10. A digital regenerator for use in hybrid amplifier and regenerator (HAR) device, the digital regenerator comprising: mapping circuitry for mapping digital upstream traffic carried in at least one ramp band which is part of a reverse band to digital upstream traffic carried in at least one express band which is also part of the reverse band but spaced from the at least one ramp band, wherein the at least one express band transports upstream traffic data at a substantially higher data rate as compared to the at least one ramp band so that upstream traffic originating from a plurality of sources can be aggregated from the at least one ramp band into the at least one express band; and an express band transmitter for transmitting digital upstream traffic from the mapping circuitry in said at least one express band. 11. A digital regenerator according to claim 10, wherein said mapping circuitry uses digital time division multiplexing to map the digital upstream traffic carried in said at least one ramp band to the digital upstream traffic carried in said at least one express band. 12. A digital regenerator according to claim 11, wherein there are a plurality of ramp bands and only one express band. 13. A digital regenerator according to claim 11, wherein there are a plurality of express bands and only one ramp band. 14. A digital regenerator according to claim 11, wherein there are only one ramp band and one express band. 15. A digital regenerator according to claim 14, wherein said mapping circuitry comprises: a diplex filter to separate the digital upstream traffic carried in the ramp band from the digital upstream traffic carried in the express band; a ramp band receiver to detect the digital upstream traffic carried in the ramp band, said ramp band receiver being connected to the diplex filter; an express band receiver to detect the digital upstream traffic carried in the express band, said express band receiver being connected to the diplex filter; a time slot manager for mapping the digital upstream traffic carried in the ramp band from the ramp band receiver to the digital upstream traffic carried in the express band from the express band receiver, said time slot manager being connected to the ramp band receiver and the express band receiver; and a control unit for controlling the mapping of the digital upstream traffic carried in the ramp band to the digital upstream traffic carried in the express band, said control unit being connected to the time slot manager, the ramp band receiver and the express band receiver. 16. A communications network for carrying downstream traffic from a system head end to a plurality of cable subscribers within a forward frequency band, and for carrying digital upstream traffic from the plurality of cable subscribers to the system head end in a reverse frequency band which is spaced from the forward frequency band and below the forward frequency band, the communications network comprising: (a) transmission means for interconnecting the system head end and the plurality of cable subscribers; (b) a plurality of hybrid amplifier and regenerator (HAR) devices located at spaced intervals along the transmission means, each hybrid amplifier and regenerator (HAR) device comprising: amplification circuitry for amplifying said downstream traffic; and a digital regenerator, wherein said digital regenerator comprises: mapping circuitry for mapping digital upstream traffic carried in at least one ramp band which is part of the reverse frequency band to digital upstream traffic carried in at least one express band which is also part of the reverse frequency band but spaced from the at least one ramp band, wherein the at least one express band transports upstream traffic data at a substantially higher data rate as compared to the at least one ramp band so that upstream traffic originating from a plurality of sources can be aggrega
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