I-joist hole cutting apparatus
First Claim
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1. A hole cutting apparatus comprising:
- a. a central portion axially holding an arbor and a pilot drill;
b. a rim having a substantially continuously circular circumference;
c. at least three spokes connecting said central portion with said rim;
d. groove cutting members circumferentially arrayed in a number equal to that of said spokes; and
wherein said groove cutting members are fixed at said rim at positions immediately adjacent said spokes and wherein said groove cutting members are circumferentially oriented in a substantially equal radial distance to said pilot drill and wherein said groove cutting members are arrayed in a substantially equal offset to said circular circumference.
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Abstract
A hole saw for cutting standardized holes in the web portion of an I-joist features a light weight three spoke body having a rim with continuous circumference and three inserted cutting blades fixed in an offset to the circumference, which is dimensioned in accordance to standard web heights.
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Citations
12 Claims
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1. A hole cutting apparatus comprising:
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a. a central portion axially holding an arbor and a pilot drill;
b. a rim having a substantially continuously circular circumference;
c. at least three spokes connecting said central portion with said rim;
d. groove cutting members circumferentially arrayed in a number equal to that of said spokes; and
wherein said groove cutting members are fixed at said rim at positions immediately adjacent said spokes and wherein said groove cutting members are circumferentially oriented in a substantially equal radial distance to said pilot drill and wherein said groove cutting members are arrayed in a substantially equal offset to said circular circumference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification