Wheel alignment method and apparatus

Geometrical instruments – Gauge – Wheel

Patent

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Details

3320315, G01B 5255

Patent

active

057971900

ABSTRACT:
A wheel alignment system that uses the sidewall of the tire to define a measurement surface. The measurement surface is established by a wheel fixture that includes a pair of slide channels having flat faces that engage the sidewall of the tire and a base structure defining a planar measurement surface parallel to the sidewall that slides back and forth on the slide channels. A flexible strap is passed around the tire and attaches to the base structure at opposite sides to hold the fixture against the sidewall. A method is described for measuring the caster and steering axis inclination while the vehicle is jacked up. Another form of apparatus used for checking wheel straightness and for making toe measurements includes a cross member long enough to extend at least across the tire and engage the sidewall on opposite sides of the wheel. The cross member is supported on a pair of parallel rods that extend perpendicular to the cross member. This apparatus is used to observe deviations in the trueness as the tire is rotated. A wheel spreader apparatus includes a long shaft, a retractable tip for engaging a wall of a tire, and a spring biasing arrangement at one end of the shaft for urging the tip against the tire wall. The shaft carries a movable stop member that may be positioned at any point along the shaft, and the stop member carries a second tip for engaging an inner wall of an opposing tire. The wheel spreader reaches across the vehicle and extends beyond the opposite side so that it may be installed from the side of the vehicle.

REFERENCES:
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"Total Wheel Alignment Sourcebook," Specialty Products Company, Feb. 1992, pp. 4-5, 78-81.
"Wheel Alignment Instructions," Instructional pamphlet, Specialty Products Company, Undated.
"The A/T-4 Four Wheel Alignment Sustem," Altech Industries advertisement, in Bodyshop Expo '95, Feb./Mar. 1995.
"The Right Track (4-Wheel Alignment)," in Motor Age, Feb. 1995, p. 18 et seq.
"Wheel Alignment," in Petersen's Basic Chassis, Suspension & Brakes No. 2, 1971, pp. 48-59 no month.

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