Device and method for the measuring of wheel angles
OwnerJonas Samuelsson, Amin Nassif Issainventors
Life of this patent
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Abstract
A method and apparatus for measuring the alignment of vehicle wheels includes a light source having two beams projecting on opposite directions. The source is mounted on the wheel approximately perpendicular to the wheel axis. Measuring scales are mounted along the paths of the beams in front of and behind the wheels. When taking measurements, the wheel is rotated 180.degree. after a first measurement and a second reading of the scales is made. The difference between the two sets of readings is used to determine the deviation of the light beam from the perpendicular to the wheel axis and this deviation is compensated for in measuring the wheel alignment. Optical sighting means such as a camera can be used in place of the two beam light source.
Claims21
A method for the measuring and adjustment of a wheel on a vehicle comprising the steps of placing the vehicle on rollers, mounting on the wheel light beam projection means emitting light beams in opposite directions and approximately perpendicular to the axis of rotation of the wheel, placing cooperating scales at different locations lengthwise of the vehicle and in the projection paths of the light beams, activating the light beam projection means and rotating the wheel on the rollers so that the opposing beams each give a reading on the corresponding cooperating scales, and using the collective readings on said scales to calculate the toe in or toe out wheel angle after compensating for deviation of the light beam from the perpendicular to the axis of rotation of the wheel.
A set up for measuring wheel angle of a wheel on a vehicle and including a light beam projection means and scales, wherein the light beam projecting means emit light beams in two opposed directions and have mounting means so that they can be mounted fixed on a wheel with the light beams approximately perpendicular to the axis of rotation of the wheel, means for rotation of the wheel 180.degree., at least two scales being provided at different locations lengthwise of the vehicle in front of the vehicle and behind the vehicle for the light beams to be projected to produce a double set of readings of differences between front and back readings at a first wheel position and at a second wheel position after 180.degree. rotation of the wheel, using the readings from said two positions to determine the degree of deviation of the light beams from normality to the axis of rotation of the wheel, and using this deviation to correct toe in or toe out wheel angle after compensating for deviation of the light beam from the perpendicular to the axis of rotation of the wheel.
A set up for measuring wheel angle of a wheel on a vehicle and including a sighting means and scales, wherein the sighting means have sighting paths in two opposed directions and have mounting means so that they can be mounted fixed on a wheel with the sighting paths approximately perpendicular to the axis of rotation of the wheel, means for permitting rotation of the wheel 180.degree., at least two scales being provided at different locations lengthwise of the vehicle in front of and behind the vehicle for the sighting paths to produce a double set of readings of differences between front and back readings at a first wheel position and at a second wheel position after 180.degree. rotation of the wheel, using the reading from said two positions to determine the degree of deviation of the sighting paths from normality to the axis of rotation of the wheel, and using this deviation to calculate the toe in or toe out wheel angle after compensating for deviation of the sighting paths from the perpendicular to the axis of rotation of the wheel.
A method for the measuring and adjustment of a wheel on a vehicle comprising the steps of placing the vehicle on rollers, mounting on a wheel sighting means with sight paths in opposite directions and approximately perpendicular to the axis of the rotation of the wheel, placing scales at different locations lengthwise of the vehicle and in the sighting paths of the sighting means, rotating the wheel on the rollers so that the opposing sighting paths each give a reading on every cooperating scale, and using the readings on these scales to calculate wheel toe in or toe out angle after compensating for deviation of the sighting paths from the perpendicular to the axis of rotation of the wheel.
Dependencies are inferred from the claim text.