Tongs, in particular for mounting ear-buttons on animals

A tongs, in particular for mounting an ear-button or ear-ring on animals, comprising a first lever and second lever forming handles, a pivot pin pivotally interconnecting the first and second levers, a first jaw and a second jaw movable between an open position and a closed position, a return spring for returning the jaws to the open position of the jaws, means for connecting the first and second levers respectively to the first and second jaws for shifting the jaws to the closed position of the jaws and comprising a mechanism for temporarily maintaining the jaws parallel to each other, rapidly-actuated means for shifting the jaws to the open position of the jaws when the first and second levers are moved toward each other beyond a position of the levers corresponding to said closed position of the jaws, the mechanism for temporarily maintaining the jaws parallel to each other comprising a link, a branch of the second lever, the link being pivoted to the branch substantially in the middle of the branch, means for rendering the link integral with the first lever and comprising said pivot pin and temporary immobilizing means which are interposed between the link and the first lever, the first and second jaws having end portions carrying means for holding respective parts of the ear-button, the branch of the second lever and the link having end portions respectively pivoted to respective ones of said end portions of the first jaw and second jaw, an opposite end of the second jaw being pivoted and slidably connected to the second lever and an opposite end of the first jaw being pivoted and slidably connected, in an armed position of the tongs, to an assembly comprising the first lever and the link, which first lever and link are rendered integral with each other by the temporary immobilizing means.