Patent ID: 7385502

Claim:
A work location locator system comprising: A) a building barrier, such as a wall, having a first side and a second side; B) a transmitter unit which includes (1) a housing having a first side which is an exposed side when the housing is placed on the first side of the barrier, and a second side which is an underside when the housing is placed on the first side of the barrier, (2) mounting elements on the housing for releasably attaching the housing of the transmitter unit to the first side of the barrier, (3) a transmitter circuit unit in the housing which generates a locator signal through the second side of the housing of the transmitter unit and through the barrier when activated, (4) a power unit in the housing, (5) an on/off switch on the housing of the transmitter unit which electrically connects the power unit to the transmitter unit when in the “on” position to generate the locator signal, and (6) a signal light electrically connected to the transmitter unit to be activated when the transmitter unit is activated; and C) a receiver unit which includes (1) a housing, (2) a signal sensor unit in the housing of the receiver unit, the signal sensor unit including circuitry which generates an electric signal when a locator signal is received by the signal sensor unit, the circuitry in the signal sensor unit including circuitry which changes signal strength of the electric signal according to the location of the receiver unit with respect to the transmitter unit, the signal strength of the electric signal being greater when the receiver unit is close to the transmitter unit than when the receiver unit is farther away from the receiver unit whereby the signal strength of the electric signal increases as the receiver unit is moved closer to the transmitter unit, (3) an indicator light system on the housing of the receiver unit, the indicator light system being electrically connected to the signal sensor unit to be activated by the electric signal generated by the signal sensor unit, the indicator light system including circuitry which increases the intensity of the light associated with the indicator light system as the signal strength of the electric signal increases, (4) a power source in the housing of the receiver unit, (5) a speaker unit on the housing of the receiver unit, the speaker unit being electrically connected to the signal sensor unit to be activated by the electric signal generated by the signal sensor unit to generate an audible signal in response to the electric signal generated by the signal sensor unit, the speaker unit including circuitry which increases the intensity of the audible signal associated with the speaker unit as the signal strength of the electric signal increases, and (6) an on/off switch on the housing of the receiver unit which electrically connects the power source in the housing of the receiver unit to the signal sensor unit and to the indicator light system and to the speaker unit when the on/off switch is in an “on” position.