US4194790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rock cutting tip inserts
Assignee: Coal Industry Patents Ltd
•
Filing: 1975-04-02
•
Granted: 1980-03-25
•
Expires: 1995-04-02
Abstract
Abstract The rock cutting tip insert of a rock cutting tool comprises two layers, the front layer being harder than the backing or base layer by at least one hundred units on the Vickers Hardness scale.
Inventors
- 👤 Peter Kenny
- 👤 Stanley N. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:07
CPC Classifications
E; E21; E21C; E21C27/00; E21C27/20; E21C27/32; E21C27/44; E21B; E21B10/00; E21B10/46; E21B10/58; E21C35/00; E21C35/18; E21C35/183; E21C35/1835; Y; Y10; Y10S; Y10S76/00; Y10S76/11; Y10T; Y10T407/00; Y10T407/26
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
117 words
A rock cutting tip insert for placing in a recess of a rock cutting tool, the tip insert comprising two separate continuous layers of similar composite material having different hardness, a first layer being a cutting margin of one hardness level and the second layer being a backing portion of material similar to the first layer having a second hardness level, of at least one thousand units on the Vickers Hardness scale, said first hardness level being at least one hundred units on the Vickers Hardness scale greater than said second hardness level, the first layer cutting margin being secured to the second layer backing portion, and the second layer backing portion being secured to the tool.
Claim 2
Dependent Claim
117 words
A rock cutting tip insert for placing in a recess of a rock cutting tool, the tip insert comprising two separate continuous layers of similar composite material having different hardness, a first layer being a cutting margin of one hardness level and the second layer being a backing portion of material similar to the first layer having a second hardness level, of at least one thousand units on the Vickers Hardness scale, said first hardness level being at least one hundred units on the Vickers Hardness scale greater than said second hardness level, the first layer cutting margin being secured to the second layer backing portion, and the second layer backing portion being secured to the tool.
Claim 3
Dependent Claim
31 words
A rock cutting tip insert as claimed in claim 1, in which the cutting margin is formed of the same material as the backing portion but subjected to a hardening process.
Claim 4
Dependent Claim
32 words
A rock cutting tip as claimed in claim 1, in which, said first hardness level is at least four hundred units on the Vickers Hardness scale greater than said second hardness level.
Claim 5
Dependent Claim
104 words
A rock cutting tool including a body and a rock cutting tip insert carried by the body and comprising a tool body having a recess for receiving a rock cutting tip, the tip having first and second continuous layers of similar composite material having different hardness, the first layer comprising a cutting margin of one hardness level and the second layer comprising a backing portion of a second hardness level, and means for securing the second layer backing portion to the tool body, said first hardness level being at least one hundred units on the Vickers Hardness scale greater than said second hardness level.
Claim 6
Dependent Claim
104 words
A rock cutting tool including a body and a rock cutting tip insert carried by the body and comprising a tool body having a recess for receiving a rock cutting tip, the tip having first and second continuous layers of similar composite material having different hardness, the first layer comprising a cutting margin of one hardness level and the second layer comprising a backing portion of a second hardness level, and means for securing the second layer backing portion to the tool body, said first hardness level being at least one hundred units on the Vickers Hardness scale greater than said second hardness level.
Claim 7
Dependent Claim
32 words
A rock cutting tool as claimed in claim 4, in which said first hardness level is at least four hundred units on the Vickers Hardness scale greater than said second hardness level.
Claim 8
Dependent Claim
19 words
The rock cutting tool as claimed in claim 4 wherein the backing portion is harder than the tool body.
Claim 9
Dependent Claim
37 words
The rock cutting tip insert as claimed in claim 1 wherein the cutting margin and the backing portion consist of a material selected from the group of materials consisting of a hard mineral, ceramic or composite material.
Claim 10
Dependent Claim
20 words
The rock cutting tip insert as claimed in claim 1, wherein the cutting margin and backing portion comprise cemented carbide.
Claim 11
Dependent Claim
29 words
The rock cutting tip insert as claimed in claim 1 further comprising a rock cutting tool and mounting means for securing the backing portion on the rock cutting tool.
Claim 12
Dependent Claim
33 words
The rock cutting tip as claimed in claim 1 wherein the tool has a recess and the mounting means comprises means for securing the backing portion on the cutting tool within the recess.
Claim 13
Dependent Claim
20 words
The rock cutting tip insert as claimed in claim 1 wherein the cutting margin is approximately 1 mm. in thickness.
References Cited (Backward Citations)
US2033594A
Cited
US1965950A
Cited
US2201159A
Cited
US3010709A
Cited
US3127945A
Cited
US3260579A
Cited
US3368882A
Cited
US3869319A
Cited
US3790353A
Cited
US3888637A
Cited
US3932952A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-03-25 | 1983-09-24 | 1984-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-25 | 1987-09-24 | 1988-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-25 | 1991-09-24 | 1992-03-25 | $7700.00 | Window Closed / Lapsed |