Geometrical instruments – Area integrators – Electrical
Patent
1980-07-14
1982-05-18
Little, Willis
Geometrical instruments
Area integrators
Electrical
33181AT, 33288, G01B 525
Patent
active
043297846
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method of checking the dimensions of vehicles, preferably in connection with carrying out alignment work on these, in which method a reference frame, which is provided with at least one longitudinal main beam provided with a measuring scale and transverse side beams likewise provided with measuring scales and displaceable in relation to the main beam, are suspended on the chassis of the vehicle, and at each checking point selected in the vehicle there is placed an indicator adapted to indicate a possible deviation in position from a desired value at an individually selected check point on the vehicle, the nominal position of which is known and which is characteristic of the vehicle.
The invention likewise relates to a device for checking the dimensions of vehicles, preferably in connection with carrying out alignment work thereon, which device comprises a reference frame which comprises at least one longitudinal main beam provided with a measuring scale and transverse side beams likewise provided with measuring scales and displaceable in relation to the main beam, the reference frame being adapted to be suspended from the chassis of the vehicle by means of securing members, and which device comprises a plurality of indicators disposed at selected check points inside the vehicle, each adapted to indicate possible deviations in position from a desired value at an individually selected check point on the vehicle, the nominal position of which is known and which is characteristic of the vehicle.
PRIOR ART
During the straightening of collision damage on vehicles, particularly motor vehicles, it is of the greatest importance that the damage portions of the frame or corresponding parts of the chassis with self-supporting bodies, should be restored to their positions precisely laid down by the manufacturer. For this purpose, various methods and devices have been proposed to indicate or measure possible faulty dimensions on the vehicle. The known indicating equipment often includes a reference frame which either constitutes a support on which the vehicle rests (see, for example, the German Patent DE 2 324 530 as laid open) or which is suspended under the vehicle and which therefore accompanies a change in position in the check points of this during the alignment work (see, for example, the U.S. Pat. No. 3,869,804). The reference frame is often provided with fault indicators in the form of upwardly directed uprights or mandrels, mounted for displacement on transverse section beams, which in turn are displaceable on longitudinal section beams, which beams together form the reference frame. The mandrels can be raised and lowered and are adapted to be adjusted in relation to predetermined check points on the chassis of the vehicle during the checking of a vehicle and then to be locked in their setting. It can happen, however, that the upper end or point of the mandrels hooks firmly in the check points and accompany their movement, in which case the mandrel easily buckles or breaks, so that the indicating equipment becomes useless. Particularly serious damage to the mandrels can occur if they are not released but accompany some check point which moves obliquely downwards during the alignment work. Often the mandrels have to be lowered after each check, in which case it is easy for the operator to forget some mandrels in the locked position, particularly if there are many check points on the vehicle. In addition, the loosening and lowering of these mandrels is a very time-consuming operation which is particularly noticeable with repeated checks at the end of each alignment work.
In the device known from the U.S. Pat. No. 3,869,804 an attempt has been made to solve this problem by letting the mandrels be fitted comparatively loosely so that they can yield when alignment forces occur. This means, however, on the one hand that the mandrels can assume faulty positions, on the other hand that the operator easily risks forgetting to loosen all the mandrels to a sufficient
REFERENCES:
patent: 2900734 (1959-08-01), Richards
patent: 3805396 (1974-04-01), Hunnicutt
patent: 3869804 (1975-03-01), Friend
patent: 4015338 (1977-04-01), Kunze et al.
patent: 4015339 (1977-04-01), Horvaccius
patent: 4165567 (1979-08-01), Olsson
patent: 4174623 (1979-11-01), Le Grand et al.
patent: 4207681 (1980-06-01), Bayorgieon et al.
Little Willis
Nicator Aktiebolag
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