FIELD: mechanics.
SUBSTANCE: proposed device is intended for piercing and incorporates eye-ring safe nut used in the studs' gun. The nut comprises the front plate with a hole receiving the studs' end and the front plate arranged on one axis with aforesaid hole. The said plate makes an intermediate surface between the studs' end and ear to be pierced. The ear-ring-nut can be fitted in the cartridge to be fitted in studs' seat for piercing. The said cartridge can be fitted in the studs' gun and withdrawn therefrom with the help of the cartridge packing box so that the piercing man may not touch the said cartridge in its loading/unloading.
EFFECT: safe and efficient piercing.
8 cl, 23 dwg
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