| 摘要 |
<p>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 (50) comprises two portions. The first is an inverted, generally U-shaped clevis (52) with spaced apart side portions (60) that fit over the circumference edge of a sawplate (42). The clevis has an upper portion (64) which extends outwardly from the sawplate edge (48) thereby defining a tooth retaining socket (65) between the sawplate edge (48) and the clevis (52). The side portions (60) of the clevis are apertured at (57) to accept a pin (56) for attachment to the sawplate which has a corresponding aperture (59). A buttress (58) attached to the clevis (52) normally bears against the leading edge (45) of a gullet (44) and prevents rearward rotation when in use. The second member is an insertable tooth (54) having a head and an elongated tapered shank (66). The shank (66) has a taper on its upper surface sufficient to form a self-releasing taper, usually between 3?o and 10o¿. The sides of the shank (66) have less taper so as to form a self-locking taper, typically between 0o and 2.5o. The tooth shank (66) is driven into the socket (65) formed between the clevis (52) and the sawplate (48). As the tooth (54) is driven in, the clevis (52) is forced radially outward against the attaching pin (56) so as to tightly lock the assembly until the tooth (54) 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 separetely. 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.</p> |
