| 摘要 |
Disclosed is a shallow water detector (10) for a boat (12) comprising a main housing (16) positionable on the boat (12), a source of electrical energy (102), a signal device (36, 38), and an actuating switch assembly (108). The actuating switch assembly includes a normally off, snap-action microswitch (110) enclosed in a housing and having a depressible operator (112) projecting therefrom which, when depressed, turns the microswitch (110) on. A switch actuator member (30) has an end portion (114) directed toward the depressible operator (112) and a guide means (116) which guides the actuator member (30) towards and away from the depressible operator (112). The actuator member (30) is biased by a spring means (120) toward and into depressing contact with the depressible operator (112). A line (28)is connected at one end to the actuator member (30) and at the other end to a weight (32). The signal device (36, 38), the source of electrical energy (102), and the microswitch (110) are connected by a conductor means (132) such that when the contacts of the microswitch (110) are closed, the signal device (36, 38) is powered by the source of electrical energy (102). The weight (32), when free-hanging, moves the actuator member (30) away from depressing contact with the depressible operator (30), causing the contacts of the microswitch (110) to open. When the weight (32) becomes grounded on the bottom (34) of a body of shallow water (14'), the line 28 becomes slack and the actuator member (30) is moved into depressing contact with the depressible operator (112) of the microswitch (110), closing its contacts and, thereby, causing the signal device (36, 38) to operate.
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