Aircraft time information system |
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| 申请号 | US3585375D | 申请日 | 1969-12-22 | 公开(公告)号 | US3585375A | 公开(公告)日 | 1971-06-15 |
| 申请人 | LEAR SIEGLER INC; | 发明人 | HEDRICK GEOFFREY S; | ||||
| 摘要 | A multipurpose time information system which drives a plurality of digital clocks for respective members of the flight crew of a large airliner, and also provides time information to various remote systems on board, such as the AIDS, the flight recorder, the radio data link, the crash recorder, and the INS. The clocks include digital readout wheels which provide a visible display for the flight crew as well as the time information for the onboard systems, and also have inherent storage capabilities which are useful in case of brief power failures. These digit wheels are advanced by nearly identical drive modules, each having solenoid-operated ratchet mechanisms responsive to carry pulses derived from the preceding less significant digit module. But the least significant digit module is reverse-driven by a motor, requiring the ratchet mechanism to slip in the reverse direction, and also requiring the numerals on the least significant digit wheel to be arranged in the opposite direction relative to the more significant digit wheels. | ||||||
| 权利要求 | 1. A time information system comprising: at least one clock which displays time in digital form; said clock including respective number wheels for each time digit so displayed, and means for rotating said number wheels as a function of time; each of said number wheels having a plurality of legible numerals distributed thereabout, whereby to be displayed in succession as said number wheels rotate; respective electrical circuits representing respective ones of said numerals; respective switching means responsive to respective ones of said number wheels, and each arranged to energize the one of said electrical circuits which represents the particular numeral which its associated number wheel is currently displaying. respective encoding means for respective ones of said number wheels, each of said encoding means being connected to receive inputs from a plurality of numeral-representing electrical circuits of its associated number wheel, and arranged to provide a coded output work representing the numeral corresponding to the input circuit currently energized; a sending shift register having a bit capacity at least equal to the number of bits in each such coded output word times the number of digits so encoded; means including gates for loading said coded words in bit parallel form into first shift register; at least one utilization system including (a) a receiving shift register having a bit capacity at least equal to that of said sending shift register, (b) means including gates for unloading the contents of said receiving shift register in bit parallel form, and (c) a device responsive to the output of said receiving shift register to utilize the information represented by said output; means including at least one time base circuit for advancing said sending and receiving shift registers at the same bit rate; a communication link connected for transferring the contents of said sending shift register in bit serial form into said receiving shift register, in response to said advancing means; and means responsive to said time base circuit for enabling said loading and unloading gates at the completion of the transfer of a full register''s contents. 2. A time information system as in claim 1, wherein: said clock is responsive to said time base circuit so that the rate of advance of sad number wheels is controlled by said time base circuit. 3. A time information system as in claim 2, further comprising: at least one additional clock having an advancing time display; each said additional clock being responsive to said time base circuit so that the rate of advance of said time display is controlled by said additional time base circuit. 4. A time information system as in claim 1, further comprising: an additional time base circuit; said clock being responsive to said additional time base circuit so that the rate of advance of said number wheels is controlled by said additional time base circuit. 5. A time information system as in claim 1, further comprising: a plurality of said utilization systems, all connected to said communication link and said advancing means to obtain time information from said sending shift register. 6. A time information system as in claim 5, for on board use, further comprising: a vehicle having a cabin for an operating crew; said clock being installed in said cabin and readable by at least one of said operating crew; said plurality of utilization systems being installed at respective locations on said vehicle remote from said cabin. 7. A time information sysTem as in claim 1 wherein said clock comprises: respective drive modules for respective ones of said number wheels; each said drive module including a solenoid and a mechanism responsive to said solenoid for advancing the number wheel of said module in one angular direction only, but permitting said number wheel to be driven in the opposite angular direction by an external drive means; the solenoid of each drive module of each more significant digit number wheel being connected to one of said electrical circuits representing a selected one of the numerals on the immediately preceding less significant digit number wheel, whereby to effect a carry to each more significant digit number wheel in turn when a selected count modulus of the less significant digit number wheel is satisfied; and a timing motor connected to drive said least significant digit number wheel at a time rate in said opposite angular direction; the numerals on said least significant digit number wheel being arranged with their numerical order direction opposite to the numerical order direction of the numerals of the more significant digit number wheels, so that each of said number wheels is rotated in the direction of increasing numerical order of its numerals. 8. A time information system as in claim 7, wherein: a toothed wheel is coupled with each of said number wheels; and said mechanism responsive to said solenoid includes pawl means engageable with said toothed wheel for rotating said toothed wheel and its associated number wheel. |
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