Measuring and testing – Testing of shock absorbing device
Patent
1996-09-09
1998-09-22
Chilcot, Richard
Measuring and testing
Testing of shock absorbing device
3320314, 3320315, 3320318, G01B 5255
Patent
active
058116575
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention concerns a device for stationary inspection of steering joints and suspension parts in vehicles.
2. Description of the Prior Art
For vehicle wheel adjustment it is a requirement that steering component and suspension parts be free from looseness and play. To inspect this freedom from looseness and play the use of a `play detector` is known, by which is meant an inspection unit designed to affect displacement movements of a vehicle wheel or pair of wheels in relation to a stationary vehicle and thereby be able to demonstrate the presence of any undesirable looseness in the connecting joints.
A known inspection unit of the type in question comprises a stand whose position is fixed in a depression in a workshop floor or similar so that an upper covering plate of the inspection unit connects to the upper side on the workshop floor. In the sunken inspection unit's stand are firmly attached in one plane two parallel steel axles on which a sledge is mounted between the axles so that it can be displaced under the influence of two hydraulic cylinders attached to the inspection unit's stand. The sledge mentioned is securely fixed to the underside of the covering plate, by means of which displacement movements can be imparted to this relative to the workshop floor in the longitudinal direction of the inspection unit.
Under the steel axles mentioned above, a sledge and hydraulic cylinders, on a second, lower plane in the control unit's stand, are firmly attached two transverse, parallel steel axles on which another steel sledge is mounted so that it can be displaced under the influence of two hydraulic cylinders. This sledge is also permanently attached to the underside of the covering plate, by means of which displacement can be imparted relative to the workshop floor in the transverse direction of the inspection unit.
In the inspection of a vehicle, the vehicle must be driven onto such a covering plate after which the vehicle is parked so that one vehicle wheel or pair of wheels takes up the central position on the covering plate of the inspection unit. Using a control unit included in the equipment for the inspection unit it is then possible to impart to the covering plate and a vehicle wheel on it or pair of wheels on them linear movements in the longitudinal and transverse directions of the vehicle so as to demonstrate any play in the connecting joints.
The known inspection unit mentioned, called the play detector, is relatively complicated and difficult to install in a workshop and, in addition, it is necessary at once to make different measurements in the longitudinal and transverse direction to be able to observe any looseness in connecting joints. This implies that such inspection units will mostly be of use in workshops for heavy vehicles.
For cars, there exist known devices for inspecting the play in vehicle steering mechanisms. Such an inspection unit for this purpose is designed with a `turn-table` on which a vehicle wheel must be placed. The turn-table is mounted to permit rotation on a fixed support plate and can imparted in a horizontal plane in the vehicle's transverse direction limited rotative movement by means of a hydraulic cylinder or suchlike. Such inspection units are made with a raised turn-table, which requires use in pairs, with an inspection unit under each front wheel. The inspection method senses solely any play in the vehicle's steering joints and steering mechanism.
SUMMARY OF THE INVENTION
The object of this invention is to make a considerably simpler mechanism for stationary inspection of steering joints and suspension parts in a vehicle, an inspection unit that is easy to install in a workshop with bearing on the workshop floor so that vehicles can drive onto and park in position on the inspection unit's upper plane. To achieve this, the invention is characterized by a device consisting of a lower plate and an upper plate that rest against one another on the same plane, the lower plate being designed for plane a
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Chilcot Richard
Josam Lastbilteknik AB
McCall Eric S.
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