Patent ID: 6907649

Claim:
A fastener setting apparatus for setting, to a workpiece, a nut-type fastener such as a blind nut which is formed as a hollow internally threaded tubular body with one end having a flange or a larger diameter portion, said fastener setting apparatus comprising: a mandrel adapted to be screwed into said fastener; a hydraulic cylinder for receiving therein a hydraulic piston for axially pulling said mandrel; an oil reservoir for containing oil to be supplied to said hydraulic cylinder; a ram reciprocatably disposed in said oil reservoir; an air cylinder for receiving therein an air piston which allows said ram connected thereto to be reciprocatingly advanced and retracted in said oil reservoir, wherein upon triggering, compressed air is supplied to said air cylinder to move said air piston to advance said ram into said oil reservoir to thereby supply oil from said oil reservoir to said hydraulic cylinder so that said hydraulic piston is moved to pull said mandrel, whereby said fastener threadedly connected with said mandrel is set to said workpiece, said fastener setting apparatus further comprising: an air-pressure setting valve for adjustably presetting the air pressure of the compressed air to be supplied in said air cylinder and applied to said air piston; a completion valve operable to discharge the compressed air from said air cylinder outside to stop the movement of said hydraulic piston; and completion valve activation assembly for enabling said completion valve to be operated, wherein when the air pressure in said air cylinder reaches the preset air pressure level, said air-pressure setting valve is operated to feed the compressed air from said air cylinder to said completion valve activation assembly so as to stop said hydraulic piston from axially pulling said mandrel at said preset air pressure.