US3913196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary cutting tool
Assignee: Lear Siegler Inc
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Filing: 1974-08-29
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Granted: 1975-10-21
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Expires: 1994-08-29
Abstract
Abstract A rotary cutting tool, such as a router, especially adapted for cutting fibrous materials cleanly comprises a cylindrical body having a first group of cutting edges extending helically in a direction from one end of the body toward the other and a second group of cutting edges extending helically in a direction from the other end of the body toward the first group of cutting edges, both groups of cutting edges terminating at a zone of confrontation of the two groups. The helices of the two groups of cutting edges are of opposite hand so that the two groups of cutting edges form a herringbone pattern. The body has diametrally opposite flutes which traverse both groups of cutting edges. The confronting cutting edges of the respective groups at the zone of confrontation are axially staggered. Each cutting edge has a rake and is undercut, as a consequence of which each cutting edge has a hook-like configuration in cross-section.
Inventors
- 👤 Arthur E Maday
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:32
CPC Classifications
B; B23; B23C; B23C5/00; B23C5/02; B23C5/10; B23B; B23B51/00; B23B51/08; B23D; B23D61/00; B23D61/003; B23C2210/00; B23C2210/04; B23C2210/0485; B23C2210/0492; Y; Y10; Y10T; Y10T407/00; Y10T407/19; Y10T407/1946; Y10T407/1948; Y10T408/00; Y10T408/89; Y10T408/909; Y10T408/9095; Y10T408/9097
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
188 words
A rotary cutting tool comprising a cylindrical body having opposite ends; a first group of cutting edges formed on and extending helically about said body in a direction from one end of said body toward its other end, said cutting edges being spaced by grooves and all of the cutting edges of said first group terminating at a zone short of said other end of said body; and a second group of cutting edges formed on and extending helically about said body in a direction from said other end toward said one end, said cutting edges of said second group being spaced by grooves and all of the cutting edges of said second group terminating at said zone and confronting the cutting edges of said first group, said groups of cutting edges being formed on helices of opposite hand, each of the cutting edges of said first group terminating short of intersection with a cutting edge of said second group, whereby the confronting ends of the cutting edges of said groups are spaced by a gap at said zone, said gap spiraling about said body at said zone.
Claim 2
Dependent Claim
188 words
A rotary cutting tool comprising a cylindrical body having opposite ends; a first group of cutting edges formed on and extending helically about said body in a direction from one end of said body toward its other end, said cutting edges being spaced by grooves and all of the cutting edges of said first group terminating at a zone short of said other end of said body; and a second group of cutting edges formed on and extending helically about said body in a direction from said other end toward said one end, said cutting edges of said second group being spaced by grooves and all of the cutting edges of said second group terminating at said zone and confronting the cutting edges of said first group, said groups of cutting edges being formed on helices of opposite hand, each of the cutting edges of said first group terminating short of intersection with a cutting edge of said second group, whereby the confronting ends of the cutting edges of said groups are spaced by a gap at said zone, said gap spiraling about said body at said zone.
Claim 3
Dependent Claim
24 words
A tool according to claim 1 including at least one axially extending flute in said body traversing both of said groups of cutting edges.
Claim 4
Dependent Claim
26 words
A tool according to claim 1 including a pair of diametrally opposite, axially extending flutes in said body traversing both of said groups of cutting edges.
Claim 5
Dependent Claim
26 words
A tool according to claim 1 wherein each of said cutting edges is undercut whereby each of said cutting edges has a hook-like configuration in cross-section.
Claim 6
Dependent Claim
23 words
A tool according to claim 1 wherein both of said groups of cutting edges are formed on helices having substantially the same pitch.
Claim 7
Dependent Claim
12 words
A tool according to claim 1 wherein said pitch is substantially 60*.
Claim 8
Dependent Claim
48 words
A tool according to claim 1 wherein each of said cutting edges is undercut whereby each of said cutting edges has a hook-like configuration in cross-section, and wherein said body has a pair of diametrally opposite, axially extending flutes therein traversing both of said groups of cutting edges.
Claim 9
Dependent Claim
22 words
A tool according to claim 7 wherein each of said flutes has a depth greater than the groove between said cutting edges.
Claim 10
Dependent Claim
34 words
A tool according to claim 1 wherein said body has cutting teeth at one end, the cutting edges of one of said groups of cutting edges extending from said cutting teeth To said zone.
Claim 11
Dependent Claim
23 words
A tool according to claim 9 wherein said body has a mounting shank at that end of said body opposite said cutting teeth.
Claim 12
Dependent Claim
40 words
A tool according to claim 1 wherein each of said cutting edges comprises a land surface flanked by a pair of said grooves, said grooves extending into said zone thereby preventing actual intersection of the cutting edges of said groups.
Claim 13
Dependent Claim
15 words
A tool according to claim 11 wherein each of said land surfaces has a rake.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |