A kind of effort formation of Beast catching device include: using an axis as center of rotation one of be pivotally arranged in a cage body pedal,Away from one of one potential difference of pedal hold touching section,Install the what cage body and the revolving member it is ipsilateral and can one of upper and lower displacement operating bar,One end is pivotally arranged on the another side of the cage body and one of swingable clamping rod,One of neighbouring operating bar rolled-up stock,And the operating bar is enabled to keep one of mobile elastic component downward； Wherein,The clamping rod another end can by the rolled-up stock clinching,And the pushing tow face of the corresponding what operating bar； Operating bar bottom end is left when the pedal tilting drives this to hold touching section,Then the operating bar is moved down by elastic component effect,The pushing tow face of operating bar is enough to be detached from the rolled-up stock sideways against the clamping rod,The valve is closed in order to the valve part is discharged.一種捕獸裝置之作動結構包括：以一軸為轉動中心樞設至一籠體內之一踏板、距該踏板一位差之一承觸段、裝設於該籠體與該轉動構件同側而可上下位移之一作動桿、一端樞設至該籠體另側而可擺動之一卡掣桿、鄰近該作動桿之一壓制件、以及令該作動桿保持朝下移動之一彈性件；其中，該卡掣桿另端可受該壓制件壓扣、並對應於該作動桿之頂推面；當該踏板翹動而帶動該承觸段離開作動桿底端，則該作動桿受該彈性件作用向下移動，作動桿之該頂推面足以側向推動該卡掣桿脫離該壓制件，俾釋放該受掣件而關閉該活門。
