Abstract: A multi-modal proximity sensor system includes one or more individual sensor units which are two-stage dual ring contact units but are flexible enough to be made as a single stage unit by omitting a single ring contact and a connector resistor. When used in either mode, a probe when deflected by proximity to an object will set off a buzzer alarm as well as a light alarm upon touching a ring contact. In the preferred embodiment (i.e., the two-stage embodiment), as soon as the probe deflects beyond a first predetermined level, a first stage alarm is generated, and as the probe is deflected past a second level, a second stage alarm is generated, which constitutes an increase in volume of the audible signal, and brighter light in the visual signal. In addition, overall sensitivity is easily adjustable by the axial adjustment of the probe within the body of the indicator unit relative to the contact rings.

Abstract: A simplified proximity alarm of the type used on motor vehicles to sense the curb, low overpasses, etc. utilizes an extended feeler probe which passes through a loop contact such that when the two meet an audio or visual alarm signalling device within the cab of the vehicle is actuated. Special means mounting the probe are provided whereby a tangential set screw doubles as a means of retaining the probe within the mounting plug under a pre-determined tension, and also the screw acts as a terminal for connection into the alarm circuit. Moisture and fume protection is provided in one embodiment, and the probe and probe tip are so designed to avoid destruction of the entire unit should the probe become snagged.

Abstract: A proximity indicator for motor vehicles, particularly recreational vehicles, has an audio or visual signal mounted in the driver's compartment and utilizes a probe which passes through a ring contact as the switching element, the probe and ring contact being longitudinally adjustable mounted in a yoke which is connected to the clamping structure with a single bolt which, when loosened, permits a longitudinal adjustment of the probe, the ring contact, and rotational adjustment of the probe and ring together.