B - Operations – Transporting – 27 – B
Patent
B - Operations, Transporting
27
B
29/41
B27B 33/08 (2006.01) B23C 5/22 (2006.01) B27B 13/02 (2006.01)
Patent
CA 1268027
11 P1 13054b ROTARY MACHINING TOOL AND METHOD OF ITS MANUFACTURE ABSTRACT OF THE DISCLOSURE The present invention is a rotary machining tool and a method of making it using an easily replaceable cutter element assembly. A circular saw is exemplary of a cutting tool which can be made using the present invention. The cutter element assembly comprises two portions. The first is an inverted, generally U-shaped clevis with spaced apart side portions that fit over the circumferential edge of a sawplate. The clevis has an upper portion which extends outwardly from the sawplate edge thereby defining a tooth retaining socket between the sawplate edge and the clevis. The side portions of the clevis are apertured to accept a pin for attachment to the sawplate which has a corresponding aperture. A buttress attached to the clevis normally bears against the leading edge of a gullet and prevents rearward rotation when in use. The second member is an insertable tooth having a head and an elongated tapered shank. The shank has a taper on its upper surface sufficient to form a self-releasing taper, ususally between 3° and 10°. The sides of the shank have less taper so as to form a self-locking taper, typically between 0° and 2.5°. The tooth shank is driven into the socket formed between the clevis and the sawplate. As the tooth is driven in, the clevis is forced radially outward against the attaching pin so as to tightly lock the assembly until the tooth is again driven out for sharpening or replacement. While the teeth may be sharpened in place on the sawplate, it is frequently advantageous to disassemble the saw and sharpen the teeth seperately. This permits a number of grinding configurations to be used which are not otherwise possible when the saw is fully assembled. The only tools required for saw assembly and disassembly are a hammer and punch. A 1.5 m diameter saw having 60 teeth can be completely retoothed in place in as little as 6 minutes.
530502
Osler Hoskin & Harcourt Llp
Weyerhaeuser Company
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