Metal saw

Claim 2

A circular saw for cutting elongated, rod-like material square, or at any selected bevel angle, said saw and its mount being carried upon a fixed, bench-like base having a front edge which a workman will normally face when operating the saw and with the saw being disposed above the material to drop downwardly upon the material, and comprising, in combination therewith: a. an elongated, horizontally-disposed table to receive and hold the rod-like material to be cut by the saw with the longitudinal reach thereof paralleling and being adjacent to the front edge of the base;

Claim 3

b. a swing arm mounted upon a vertical pivot carried on the base beneath the table, the vertical pivot axis thereof projecting through the table at a position where material on the table may be centered with respect to this axis and said arm extending rearwardly and upwardly therefrom to project behind and above the table to carry a horizontally disposed trunion shaft behind and above the table; c. a tippable frame mounted upon said trunion shaft to extend forwardly therefrom and over and above the table; d. a horizontal, powered, saw shaft on said frame positioned over the table and substantially at the projection of the vertical axis of the pivot, and with the aforesaid circular saw carried upon the shaft at a point intersecting the said projection of the vertical axis of the pivot whereby the saw is essentially centered at the extension of said vertical pivot axis above the table to permit the saw to drop downwardly and directly upon a piece of material on the table at the said pivot axis with the angle of the cut being selected by swinging the swing arm, and with the saw blade adapted to move a short distance below the table surface as it cuts through the piece of material; e. a cutout in the table about the vertical axis of the pivot having proportions slightly greater than the span of the portion of the blade moving below the table surface; and f. a horizontal, circular guide plate upstanding from the swing arm at the pivot axis and extended into the cutout and to the surface of the table with an axial center-slot therein to receive the portion of the blade which moves below the table surface, said saw and guide plate rotating together whenever the swing arm swings.

Claim 4

b. a swing arm mounted upon a vertical pivot carried on the base beneath the table, the vertical pivot axis thereof projecting through the table at a position where material on the table may be centered with respect to this axis and said arm extending rearwardly and upwardly therefrom to project behind and above the table to carry a horizontally disposed trunion shaft behind and above the table; c. a tippable frame mounted upon said trunion shaft to extend forwardly therefrom and over and above the table; d. a horizontal, powered, saw shaft on said frame positioned over the table and substantially at the projection of the vertical axis of the pivot, and with the aforesaid circular saw carried upon the shaft at a point intersecting the said projection of the vertical axis of the pivot whereby the saw is essentially centered at the extension of said vertical pivot axis above the table to permit the saw to drop downwardly and directly upon a piece of material on the table at the said pivot axis with the angle of the cut being selected by swinging the swing arm, and with the saw blade adapted to move a short distance below the table surface as it cuts through the piece of material; e. a cutout in the table about the vertical axis of the pivot having proportions slightly greater than the span of the portion of the blade moving below the table surface; and f. a horizontal, circular guide plate upstanding from the swing arm at the pivot axis and extended into the cutout and to the surface of the table with an axial center-slot therein to receive the portion of the blade which moves below the table surface, said saw and guide plate rotating together whenever the swing arm swings.

Claim 5

The organization defined in claim 1 wherein: the tippable frame supporting the saw blade and the swing arm supporting the tippable frame are offset to one side of the plane of the saw blade a distance at least equal to the distance between the aforesaid pivot axis extending through the table and the longitudinal back edge of the table, at the side adjacent to the connection of the frame to the swing arm, whereby to permit the saw blade to be swung from a normal cross cut position perpendicular to the edge of the table to a ripping position over the table and parallel to the said back edge of the table with the swing arm and carrier frame being alongside the said back edge of the table.

Claim 6

The organization defined in claim 2 wherein: the table is transversely shiftable from a limiting forward position to a limiting back position where the said back edge is extended toward the connection of the frame and swing arm, and the frame and swing arm offset is proportioned to clear said back edge when the table is moved to its limiting back position and the swing arm is swung to place the saw blade at the aforesaid ripping position.

Claim 7

The organization defined in claim 1 wherein: a fence is provided at the aforesaid back edge of the table to upstand from the table surface to hold an edge of a workpiece in place parallel with the table edge.

Claim 8

In the organization defined in claim 1, wherein: the table is transversely shiftable from a limiting forward position to a limiting back position to shift a workpiece so that its position is substantially centered over the aforesaid vertical pivot; and wherein said cutout in the table is formed as a transverse slot to permit the table to shift transversely without interference by the guide plate.