Title: Differential pressure visual and audible warning signal device for hydraulic and pneumatic systems

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Abstract: A combination visual and audible differential pressure warning signal device for fluid power, that is, hydraulic and pneumatic systems such, for example, as those employed in mobile equipment, industrial machinery, or the like. Thus, in a typical use of the invention, when the pressure in the hydraulic system, as in an oil filter, drops below a desired and predetermined normal, due to clogging of the filter, or for other reasons, the hydraulic pressure from the source, such as an oil pump, overcomes the combined pressure or force of the oil entering the signal device from the filter and the force of a resetting coil spring in the signal device, to actuate magnetic means which raises a normally concealed colored (red) visual warning signal into a position in which it may be seen through a window in the body of the signal device while, at the same time, closing an electrical circuit to an audio or audio-visual warning signal device. Both the visual signal and the audio or audio-visual signals remain in actuated position until the difficulty in the oil filter, or the like, is corrected, and the hydraulic pressure in the system, as from an oil filter, is restored to normal, whereupon the force of the resetting coil spring, in conjunction with the force of gravity, returns the parts to their normal position, thereby moving the colored visual signal to its normal concealed position while, at the same time, breaking the electrical circuit to the audio or audio-visual signal device.


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