US3820849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cutting tips removably secured in milling cutter head
Assignee: Santrade Ltd
•
Filing: 1973-01-22
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Granted: 1974-06-28
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Expires: 1993-01-22
Abstract
Abstract A carbide cutting tip is mounted in a separate cartridge which is removably secured in a rotary milling cutter head, so that break-down of the tip will not endanger damage to the cutter head but only the cartridge.
Inventors
- 👤 H Lundstrom
- 👤 B Liljekvist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 00:31
CPC Classifications
E; E21; E21C; E21C35/00; E21C35/18; E21C35/19; Y; Y10; Y10T; Y10T407/00; Y10T407/19; Y10T407/1906
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
134 words
A milling cutter for rock drilling which comprises: a milling cutter head the periphery of which is provided with a plurality of recesses, each said recess terminating radially inwardly in a T-shaped enlargement with a closed base the mouth of which is narrowed by respective projections; a plurality of cutter tool holders each having at one end portion a carbide tip insert and at its opposite end a T-shaped end portion removably secured in one of said recesses; each said projection having opposed contact surfaces which converge in the direction from which the T-shaped end portion is mounted and which engage corresponding contact surfaces on said T-shaped end portion, the projections when placed under compression across their opposed surfaces wedgedly supporting said holder from the closed bases of said recesses on said cutter head.
Claim 2
Dependent Claim
134 words
A milling cutter for rock drilling which comprises: a milling cutter head the periphery of which is provided with a plurality of recesses, each said recess terminating radially inwardly in a T-shaped enlargement with a closed base the mouth of which is narrowed by respective projections; a plurality of cutter tool holders each having at one end portion a carbide tip insert and at its opposite end a T-shaped end portion removably secured in one of said recesses; each said projection having opposed contact surfaces which converge in the direction from which the T-shaped end portion is mounted and which engage corresponding contact surfaces on said T-shaped end portion, the projections when placed under compression across their opposed surfaces wedgedly supporting said holder from the closed bases of said recesses on said cutter head.
Claim 3
Dependent Claim
27 words
A milling cutter as defined in claim 1, in which the opposed contact surfaces taper to provide a wedge angle of from about 9* to about 12*.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |