Machine for boring a plate workpiece

Claim 1

A machine for boring a hole in a glass plate, said machine comprising: a support; a lower clamp arm carried on said support and having an upper clamp surface adapted to support the glass plate; an upper clamp arm carried on said support and having a vertically displaceable lower clamp surface adapted to press the glass plate down against said upper clamp surface; a lower drill arm pivotal about a horizontal axis on said support and having an outer end provided with an upwardly directed boring tool centered on a tool axis; an upper drill arm pivotal about said horizontal axis on said support and having an outer end provided with a downwardly directed boring tool centered on a tool axis, the tool axes lying in a common vertical plane generally perpendicular to the horizontal axis; drive means for rotating the tools about the respective tool axes; and motor means for moving at least one of said clamp arms toward the other clamp arm to secure the glass plate between the clamp surfaces and for pivoting both of said drill arms similarly toward each other about the horizontal axis from a position with the tool axes crossing each other toward a position with the tool axes coaxial and the tools in vertical engagement through the glass plate held by the clamp arms, whereby such movement of said tool arms bores a hole vertically through the glass plate.