Horology: time measuring systems or devices – Time interval – Electrical or electromechanical
Patent
1980-04-23
1983-01-04
Weldon, Ulysses
Horology: time measuring systems or devices
Time interval
Electrical or electromechanical
368 10, 368 2, G04F 800, G04F 1000
Patent
active
043670512
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a relative time interval measuring instrument which is capable of simultaneously measuring a plurality of time intervals and providing displays of differences between, for example, the shortest one of the measured time intervals and the others and their ranking.
BACKGROUND ART
For example, in a certain contest, for measuring the time of each of the contestants who start all together but reach the goal separately, use has been made of stopwatches in the past. Since the stopwatch is operated by man, only two stopwatches can be handled by both hands and, in the case of the contestants being three or more, two or more timekeepers are needed.
Further, in the case where before measurement of one object is finished, measurement of another object is started, that is, in the case where measurements of many objects are started one after another, only two objects could be measured by one person using stopwatches.
It is important in some cases to clock many contestants and learn how much difference exists between a minimum one of their times and the other. In the past, it has been necessary to calculate such difference by hand.
According to the conventional stopwatch, if it is used again after one measurement, the previous measured value is removed; therefore, it must be recorded on paper or the like.
An object of this invention is to provide a relative time interval measuring instrument which is capable of measuring a plurality of times simultaneously with one instrument, displaying in the form of quantity a difference between, for example, a shortest one of the measured times and each of the others, and displaying their ranking, and which is able to display one measured time and, after displaying other measured times, display the previously one, that is, a relative time interval measuring instrument which has a function of measuring a plurality of times and a function of calculating the measured values.
Next, the relative time interval measuring instrument of this invention will be described with reference to the drawings.
DISCLOSURE OF THE INVENTION
According to this invention, there are provided a plurality of keys, a relative difference key, timer memories corresponding to the number keys and individually performing counting operation in the time interval from their start to stop and a display unit. Upon depression of one of the number keys, the timer memory corresponding thereto is started to perform its counting operation, and when the number key is depressed again the corresponding timer memory is stopped from operation.
Upon depression of the relative difference key, a maximum (or minimum) value is selected from the count contents of the timer memories; and when the relative difference key is depressed subsequently, a difference between the abovesaid selected value and each of the other count contents in a decreasing (or increasing) order is calculated upon each depression of the relative difference key, and the calculated difference is displayed on the display unit together with the number of the number key corresponding to each count content and its ranking.
Further, a simultaneous start key is provided, and by its depression, all of the timer memories can be started or stopped simultaneously. Moreover, a time key is provided, and by depressing this key and one of the number keys, the count content of the timer memory corresponding to the number key can be displayed at will. Furthermore, an auto-key is provided, and upon each depression of this key, the timer memories are stopped one by one in a predetermined order.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a plan view showing an example of the relative time interval measuring instrument of this invention;
FIG. 2 is a block diagram showing various memories for use in this measuring instrument;
FIG. 3 is a diagram showing the state in the case of simultaneous starting and separate stopping of timer memories;
FIG. 4 is a diagram showing the state in which measured values are displayed one after another by
REFERENCES:
patent: 4035627 (1977-07-01), Dickinson
patent: 4094138 (1978-06-01), Chetelat et al.
patent: 4104865 (1978-08-01), Sasaki
patent: 4166360 (1979-09-01), Yamaguchi
Roskoski Bernard
Weldon Ulysses
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