| 摘要 |
The tunnel trap is for use on paths normally used by rats and has two trips operated sequentially. A rat entering either end of the tunnel activates one trip and advances into the tunnel, activating the other trip, releasing the spring driven striker. This procedure and specific proportioning of elements of the trap assures that regardless of which direction the rat is passing through the tunnel it will be trapped and killed. In a mechanical embodiment the striker is held and released by a latch which is activated by a plunger rod which is, in turn, held and released by two latches, one activated by one trip pad in the tunnel and the other by a second trip pad. Each pad extends from near one end of the tunnel toward its longitudinal center. The pad ends toward the center are a distance apart related to the size range and physiques of the rats to be trapped. This distance is such that when the forefeet of a rat press on a second pad the striker moving in the lengthwise center of the tunnel will strike the rat in the vital zone between the base of its skull and the lower extremity of its lungs.
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