초록 ▼

A tapping attachment for threading a relatively large number of holes through a sheet metal part at a relatively low cost per hole. The tapping attachment includes a thrust bearing assembly which is aligned with a turret-type punch press or the like and movable in response to an axially directed for

A tapping attachment for threading a relatively large number of holes through a sheet metal part at a relatively low cost per hole. The tapping attachment includes a thrust bearing assembly which is aligned with a turret-type punch press or the like and movable in response to an axially directed force generated by the punch press. The axially directed force applied from the press to the thrust bearing assembly is transferred to a spline shaft. The spline shaft is rotated wihin and moved linearly relative to a screw threaded roller nut, whereby the axially directed force is converted into a rotating force for advancing and turning a tap at high speeds of rotation. A nitrogen reservoir is provided so that a supply of gas is available for returning the thrust bearing assembly and the spline shaft to their initial positions in order that a new hole can be tapped in response to another axially directed force. Also provided is an oil reservoir so that a supply of oil is available for lubricating and cooling the tap via an oil spout.

대표청구항 ▼

A tapping attachment having a threaded tap by which to tap a hole formed in a workpiece and a body to be received at and supported by a press of the type having reciprocally movable force generating means, said tapping attachment comprising: surface means aligned with the press to receive a force ge

A tapping attachment having a threaded tap by which to tap a hole formed in a workpiece and a body to be received at and supported by a press of the type having reciprocally movable force generating means, said tapping attachment comprising: surface means aligned with the press to receive a force generated thereby and movable linearly from a first position to a second position in response to the force generated by the press; shaft means interfaced with said surface means and movable linearly therewith in response to the force generated by the press; means located between said shaft means and the tap to convert the linear movement of said shaft means into both linear and rotary movements of the tap to advance the tap into and thread the hole in the workpiece; and pneumatically operated means cooperating with said surface means and adapted for movement therewith for returning said surface means to the first position from the second position when the force generated by the discontinued so as to withdraw the tap from the hole in the workpiece.