Device for cutting ovals in mats or glass sheets

Abstract

A device for cutting ovals or circles in sheet material. A baseboard is secured adjustably atop a parallel pair of base channels by a combination of screws and coil springs. A base plate secured to one end of the baseboard supports (1) a pair of swivel-mounted hold-down arms and hold-down pads having swivel-mounted, spring-urged pads; (2) a tee bar with a slidably mounted scaled flat shank portion and a crossbar with a center index line; and (3) an upright frame member. The upright frame member supports a horizontal frame member extending forward over the baseboard and having a pair of spaced-apart transverse guide bars with a longitudinal opening extending in between them. A circular disc is mounted for rotation by a handle, within and tangent to the transverse guide bars, and the disc has a slot extending radially from about the center out toward the circumference of the disc. A compound bearing member is mounted for both rotation and lengthwise movement in the longitudinal opening and also is set to a chosen position in the slot which determines the eccentricity of the oval to be cut. Attached thereto, below the disc, is a rotatable member with a depending clamp. A calibrated bar is adjustably mounted in the clamp and rotates with it. Depending from the bar is a cutter assembly that carries a knife or glass cutter for cutting the oval in the mat or glass.