Geometrical instruments – Gauge – Wheel
Patent
1992-09-15
1994-11-22
Cuchlinski, Jr., William A.
Geometrical instruments
Gauge
Wheel
33836, 33504, 33558, G01B 726
Patent
active
053656687
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
In order to monitor the wear of a tire, it is known to use depth gauges comprising a probe able to engage into each groove of a tire, a bearing face able to come into contact with the peaks of the ribs and a means of reading giving the depth of engagement of the probe in the groove.
Such gauges are either mechanical, in which case the reading is effected on a graduated scale, or electronic, in which case they comprise means converting the position of the probe into an analog or digital electrical signal, means of processing and of calculation and means of display of the result of the measurement.
The device described in the U.S. Pat. No. 4,631,831 also comprises means memorizing the values of each measurement, calculating the mean value of these measurements and transmitting this result to the means of display.
Such an apparatus thus provides the mean value, expressed in millimeters, of the depth of the ribs and, consequently, merely indicates a value relating to the wear of the tire permitting management of a fleet of vehicles.
SUMMARY OF THE INVENTION
The aim of the present invention is to provide means, of the type quoted above, which permit, in addition to and on the basis of a measurement of the wear of a tire, detection of faults in geometry of the wheel set carrying this tire, namely, camber, parallelism, caster, and to do so without the operator needing to carry out any calculations.
These means are of the type comprising a portable box, a probe which is movable with respect to a bearing face and able to measure the depth of each groove of the tread of the tire, means converting the position of the probe into a signal, means memorizing this signal, means of processing and of calculation processing each signal and sending a data item to a means of visual display.
According to the invention, they also comprise means converting each of the depth measurements, effected at at least two opposed lateral points on the tread, into the form of a rate of wear, determined by reference to a groove depth corresponding to nil wear and memorized in the means of processing and of calculation, means bringing about the display and the memorizing of each measurement result, and at least one means of control able to trigger the means of processing and of calculation to compare the memorized measurement results and to send to the means of display a data item indicating the state of the geometry of the tire.
Thus, after having taken account of the rate of wear of the tire on each measurement region, the operator can, by simple action on a manual control, and by virtue of the means of processing and of calculation previously used for converting the depth into a percentage, bring about the display of a data item on the state of the geometry of the wheel set.
According to the embodiments, this data item is constituted by the most significant rate of wear or by the rate corresponding to the deviation between the measured wears. Needless to say, if the deviation between the displayed wears is nil, the means of display indicate a nil value, that is to say zero, which indicates that the wear of the tread is uniform and that the geometry of the wheel set does not have to be examined, which is not the case for any other value of deviation.
In one embodiment of the invention, the means of monitoring comprise, on the face of the box incorporating the means of display and in proximity to a symbolic representation of at least one wheel of the vehicle, on the one hand, as many means of light signalling as the number of measurements having to be effected on each tire, these means being arranged with respect to the representation of the wheel in the same way as the measurement regions on the tread, on the other hand, a means of control triggering, after carrying out the measurements on each wheel, the means of processing and of calculation to compare the memorized values of the depth measurements effected, to display on the screen the maximum value indicated in the form of a rate with respect to nil wear
REFERENCES:
patent: 2662295 (1953-12-01), Heal
patent: 3170243 (1965-02-01), Williams
patent: 3740710 (1973-06-01), Weintraub et al.
patent: 4195413 (1980-04-01), Haraguchi et al.
patent: 4227308 (1980-10-01), Talansky et al.
patent: 4574490 (1986-03-01), Curchod
patent: 4631831 (1986-12-01), Bacher et al.
Boireau Christian
Canovas Gines
Debilly Marc
Cuchlinski Jr. William A.
Debilly Marc
Galvin Robert
Raffault Gerard
Wirthlin Alvin
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