Patent Application
20190145477
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The disclosure and prior art relates to brake chamber adjustment detection and warning devices and more particularly pertains to a new brake chamber adjustment detection and warning device for detecting an out of adjustment brake chamber and warning a driver thereof.
An embodiment of the disclosure meets the needs presented above by generally comprising a brake adjustment detection assembly configured to warn a driver when a brake is out of adjustment. The assembly comprises of a vehicle. A brake chamber mounted on the vehicle and is configured to apply and release a brake. A sensor unit configured to detect an out of adjustment brake chamber and warn a driver if the brake chamber is out of adjustment.
There has thus been outlined, rather broadly, the more important features of the disclosure in order that the detailed description thereof that follows may be better understood, and in order that the present contribution to the art may be better appreciated. There are additional features of the disclosure that will be described hereinafter and which will form the subject matter of the claims appended hereto.
The objects of the disclosure, along with the various features of novelty which characterize the disclosure, are pointed out with particularity in the claims annexed to and forming a part of this disclosure.
The disclosure will be better understood and objects other than those set forth above will become apparent when consideration is given to the following detailed description thereof. Such description makes reference to the annexed drawings wherein:
With reference now to the drawings, and in particular to
As best illustrated in
A diaphragm 28 is mounted within the brake chamber 14 and has a first side 30 and a second side 32. The diaphragm 28 is positioned between the first portion 24 and the second portion 26 such that the first side 30 faces the first wall 18 and the second side 32 faces the second wall 20. The diaphragm 28 has a resting position wherein the first side 30 is convex and the second side 32 is concave and an inverted position wherein the first side 30 is concave and the second side 32 is convex. The first portion 24 inverts the diaphragm 28 when a brake pedal is pushed.
A push rod 34 is mounted in the brake chamber 14 and has a first end 36 and a second end 38. The push rod 34 extends through an aperture 40 on the second wall 20. The second end 38 is positioned outside of the housing 16 and the first end 36 is positioned within the housing 16. A plate 42 is attached to the first end 36 and lies in a plane orientated perpendicular to a longitudinal axis that extends through the first 36 and second ends 38. The plate 42 engages the second side 32 of the diaphragm 28. The push rod 34 is further extended outwardly of the housing 16 when the diaphragm 28 is in an inverted position. A spring 44 is mounted in the housing 16 and the push rod 34 extends through an axis of the spring 44. The spring 44 reverts the diaphragm 28 from the inverted position to the resting position when the brake pedal is released. A coupler 46 releasably couples the first portion 24 and the second portion 26 together.
The second end 38 of the push rod 34 is attached to an upper end 48 of a slack adjuster 50. A lower end 52 of the slack adjuster 50 is mechanically coupled to a camshaft. The slack adjuster 50 is rotatable with respect to the camshaft and rotates the camshaft when pushed by the push rod 34. The camshaft is mechanically coupled to the brake shoe such that the brake shoe is pressed against the brake drum when the camshaft is rotated. In the inverted positioned the push rod 34 is extended to push the slack adjuster 50 and thus apply the brakes.
A sensor unit is included that detects an out of adjustment brake chamber 14 and warns a driver thereof. The sensor unit includes a magnet 54 that is attached to the push rod 34 and is spaced from the first 36 and second ends 38. The magnet 54 is positioned closer to the first end 36 than the second end 38. A sensor 56 is positioned adjacent to the aperture 40 and detects the magnet 54 as the magnet 54 extends through the aperture 40. A control circuit 58 is electrically coupled to the sensor 56 and a light emitter 60 that is positioned within the vehicle 12. The light emitter 60 is illuminated when the sensor 56 detects the magnet 54. A power supply 62 is positioned in the vehicle 12 and is electrically coupled to the sensor 56 and the light emitter 60.
In use, the brake chamber 14 is used conventionally. The first portion 24 is in mechanical communication with a relay valve. The relay valve receives a signal from the brake pedal of the vehicle 12. Once the brake pedal is pressed the relay valve releases air into the first portion 24 to invert the diaphragm 28 and extend the push rod 34 outwardly from the brake chamber 14. The push rod 34 pushes the slack adjuster 50 which rotates the camshaft. The rotated camshaft applies the brakes. When the brake pedal is released the relay valve stops pressurizing the first portion 24 and the spring 44 reverts the diaphragm 28 back into a resting position. Through wear and tear the brake chamber 14 loses adjustment causing the push rod 34 to extend outwardly further than a safe threshold. The safe threshold differs for each size of brake chamber 14. For example a 30-30 brake chamber 14 has a safe threshold of 2.0 inches. The magnet 54 is positioned on the push rod 34 such that the sensor 56 can detect when the push rod 34 has extended passed the safe threshold. The sensor 56 sends a signal to the control circuit 58, which illuminates the light emitter 60 inside of the vehicle 12 warning the driver of the out of adjustment brake chamber 14.
With respect to the above description then, it is to be realized that the optimum dimensional relationships for the parts of an embodiment enabled by the disclosure, to include variations in size, materials, shape, form, function and manner of operation, assembly and use, are deemed readily apparent and obvious to one skilled in the art, and all equivalent relationships to those illustrated in the drawings and described in the specification are intended to be encompassed by an embodiment of the disclosure.
Therefore, the foregoing is considered as illustrative only of the principles of the disclosure. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the disclosure to the exact construction and operation shown and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope of the disclosure. In this patent document, the word “comprising” is used in its non-limiting sense to mean that items following the word are included, but items not specifically mentioned are not excluded. A reference to an element by the indefinite article “a” does not exclude the possibility that more than one of the element is present, unless the context clearly requires that there be only one of the elements.
