How is a rat trap designed? - briefly
A rat trap generally uses a spring‑powered bar held back by a baited trigger plate; when the rodent steps on the plate, the spring releases, driving the bar forward to kill instantly. The enclosure is made of sturdy metal or plastic to contain the animal and allow repeated operation.
How is a rat trap designed? - in detail
A rodent capture device consists of a frame, a trigger mechanism, a killing or containment component, and a bait station. The frame is typically forged from steel or molded from high‑impact plastic to resist gnawing and corrosion. The trigger employs a spring‑loaded lever or a tensioned wire that releases when the rat applies a specific amount of force, usually between 15 and 30 g, ensuring activation only by the target animal.
The lethal element may be a wooden or metal bar that snaps shut at speeds exceeding 2 m/s, delivering a fatal blow to the cervical vertebrae. Live‑capture models replace the snap bar with a hinged door that closes once the animal steps on the trigger platform, sealing the interior with a latch that prevents escape. Glue boards incorporate a non‑sticky, replaceable surface coated with a high‑adhesion polymer; the surface is positioned beneath the trigger platform to capture the rodent without a moving part.
Bait placement is critical for efficacy. A small cavity or recessed groove holds attractants such as peanut butter, dried fruit, or commercial rodent lures. The cavity is designed to restrict the rat’s head while allowing mouth access, guaranteeing sufficient pressure on the trigger. Some designs integrate a removable bait tray for easy cleaning and reloading.
Manufacturing tolerances focus on consistent spring force, alignment of the release lever, and smooth operation of moving parts. Injection‑molded plastic components are produced with a tolerance of ±0.1 mm to prevent premature release or jamming. Metal parts undergo heat treatment to achieve a hardness of 45–55 HRC, balancing durability with sufficient flex.
Safety features include a shield that covers the snap bar when the trap is set, preventing accidental injury. A lockout lever disables the trigger during handling. For electronic variants, a low‑voltage circuit delivers a quick, high‑current pulse to the animal, and a built-in battery monitor alerts the user when replacement is required.
Testing protocols involve repeated activation cycles using calibrated force gauges, verification of kill efficiency with cadaver specimens, and compliance checks against pest‑control regulations that mandate humane standards and material safety.