Romolo Messina

51974533, Mar 30, 1993

Aug 28, 1992

7/937635

Romolo Messina - Exton PA

Sanders Saws, Inc. - Honey Brook PA

B28D 104
E01C 2309

125 15

A two-tier groove cutting circular saw blade includes a circular middle core having sectors defined about the periphery, a pair of side cores disposed adjacent opposite surfaces of the middle core and having lands defined about their outer peripheries, and pluralities of outer and inner cutting segments are secured to the respective middle core sectors and side core lands. Each side core is smaller in diameter than the middle core such that the side core lands and inner cutting segments secured thereon are displaced radially inwardly from the middle core sectors and outer cutting segments secured thereon, thereby adapting the blade for cutting a narrow lower tier and a wider upper tier of the two-tier groove. The blade also includes core anti-undercut features provided on the middle and side cores at predetermined locations thereon for defining exit paths for flow of material particles generated from the cutting of the groove and flushing of the groove by fluid coolant. The side cores of the blade can be interlocked with the middle core by flanges on their peripheries extending through windows or recesses in the middle core adjacent to the peripheries of the side cores.

52857689, Feb 15, 1994

Aug 28, 1992

7/937638

Romolo Messina - Exton PA

Sanders Saws, Inc. - Honey Brook PA

B28D 104
B28D 112

125 15

A two-tier groove cutting circular saw blade includes a circular core having sectors defined in circumferentially spaced relation to one another along the periphery, and lands defined in circumferentially spaced relation to one another between the periphery and center of the core. Pluralities of outer and inner cutting segments are secured to the respective core sectors and lands. First and second pluralities of anti-undercut elements are defined on the core respectively between the center and periphery thereof and along the periphery thereof between preselected ones of the lands and sectors for defining first and second exit paths away from the inner and outer cutting segments for flow of material particles generated from the cutting of the groove and flushing of the groove by fluid coolant so as to reduce wear and undercutting of the core adjacent to the inner and outer cutting segments. The core has an outer annular portion extending between the lands and sectors of the core and an inner annular portion extending between the lands and the center of the core. The thickness of the inner annular portion of the core is greater than the thickness of the outer annular portion of the core.