Road tractor semi-trailer combination
First Claim
1. A road tractor semi-trailer combination comprising:
- a road tractor having a fifth wheel;
a semi-trailer having a kingpin which can be coupled to the fifth wheel;
a marker in the middle of a bottom of the kingpin that includes a magnet or a coil of electro-conductive wire;
a sensor unit connected to the fifth wheel for detecting the position of the marker relative to the fifth wheel, which sensor unit comprises a sensor that includes a magnet or a coil of electro-conductive wire by which the position of marker can be detected;
a displacement means for displacing the sensor from a resting position to an operating position, wherein in the resting position the sensor is at a first distance from the marker and is incapable of detecting the position of the marker during the coupling and/or immediately after the coupling of the semi-trailer to the road tractor, and wherein in the operating position the sensor is located at a second distance from the marker and the sensor is capable of detecting the position of the marker;
a spring connected to the fifth wheel and pushing the sensor unit in operating position against the bottom of the kingpin.
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Accused Products
Abstract
A road tractor semi-trailer combination 1 is equipped with a system for detecting the position of a road tractor relative to a semi-trailer. This system comprises a magnet 13 which is accommodated in the center of the bottom of the kingpin and a sensor unit 11 which is fixed to the bottom of the fifth wheel 9.
The sensor unit can be displaced between a resting position at a distance from the magnet where the position of the magnet cannot be detected, and an operating position at a distance from the magnet where the position of the magnet can be detected indeed.
The fifth wheel is equipped with a handle for displacing a locking pawl which locks the kingpin in the fifth wheel in coupled state of the road tractor and the semi-trailer. This handle is connected via a pulling cable to the sensor unit for displacing the sensor unit to the operating position simultaneously with the displacement of the locking pawl.
18 Citations
8 Claims
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1. A road tractor semi-trailer combination comprising:
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a road tractor having a fifth wheel; a semi-trailer having a kingpin which can be coupled to the fifth wheel; a marker in the middle of a bottom of the kingpin that includes a magnet or a coil of electro-conductive wire; a sensor unit connected to the fifth wheel for detecting the position of the marker relative to the fifth wheel, which sensor unit comprises a sensor that includes a magnet or a coil of electro-conductive wire by which the position of marker can be detected; a displacement means for displacing the sensor from a resting position to an operating position, wherein in the resting position the sensor is at a first distance from the marker and is incapable of detecting the position of the marker during the coupling and/or immediately after the coupling of the semi-trailer to the road tractor, and wherein in the operating position the sensor is located at a second distance from the marker and the sensor is capable of detecting the position of the marker; a spring connected to the fifth wheel and pushing the sensor unit in operating position against the bottom of the kingpin. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification