Cutting – Tool or tool with support – Toothed blade or tooth therefor
Reexamination Certificate
1999-05-25
2001-04-24
Rachuba, M. (Department: 3724)
Cutting
Tool or tool with support
Toothed blade or tooth therefor
C083S835000
Reexamination Certificate
active
06220140
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to metal-cutting bandsaw blades and, in particular, to a tooth arrangement for such blades, wherein there are both straight teeth and set teeth.
Bandsaw blades for cutting metal have long been made with differences in tooth height, tooth pitch distance and teeth setting, which has proven to be an efficient way to avoid vibrations and to get smoother cut surfaces especially when cutting large diameter solid sections. One known way to make such a saw blade is to arrange the teeth in recurring groups with variable pitch distances between the teeth of each group. The length of each group should preferably be at least as great as the thickness of the material to be cut. It has also been shown that to achieve best results it is important to have very good repeatability (consistency) of the tooth setting, i.e., not only the amount and angle of tooth setting, but also the angle of twist the tooth during setting. One known way to do this is to use tools large enough for punching, grinding and simultaneously setting all the set teeth of the group, but in the case of long groups that approach requires expensive tooling. Setting the teeth individually is difficult to do with precision, since the twist and the spring-back occurring after setting are much influenced by the magnitude of the distance to the adjoining teeth, as well as the nature of the setting of the adjoining teeth, which may vary within the recurring group.
The present invention concerns a bandsaw blade with teeth arranged for easy precision setting by means of tooling of limited size, even for saw blades with large teeth and long average pitch distance.
SUMMARY OF THE INVENTION
The invention relates to a metal-cutting bandsaw blade comprising both straight teeth and set teeth. The set teeth have equal height and occur in pairs, with the distances between the set teeth in respective pairs of set teeth being equal. A distance from any set tooth to an adjacent straight tooth has a value which is different and larger than the distance between the set teeth.
REFERENCES:
patent: 4179967 (1979-12-01), Clark
patent: 4557172 (1985-12-01), Yoneda
patent: 4727788 (1988-03-01), Yoshida et al.
patent: 5331876 (1994-07-01), Hayden, Sr.
patent: 5603252 (1997-02-01), Hayden, Sr.
patent: 43 24 411 (1994-02-01), None
patent: 523 586 (1921-08-01), None
patent: 1 406 673 (1965-11-01), None
patent: 4-069112 (1992-03-01), None
Article: “DoAll Multi-Pitch Band Saw Blades”, Machinery and Production Engineering, Burgess Hill, GB (Oct. 19, 1977, pp. 384-385).
Burns Doane Swecker & Mathis L.L.P.
Kapman AB
Rachuba M.
LandOfFree
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