US4902073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cutter pick for mining using hydraulic stream
Assignee: Individual
•
Filing: 1988-10-26
•
Granted: 1990-02-20
•
Expires: 2008-10-26
Abstract
Abstract A cutter pick for a mining machine has a lug carrying a cutting tip of hard, abrasion resistant material at its forward end. A passage extends through the lug with provision at its rearward end for connection to a source of high pressure liquid and with a nozzle at its leading end venting through the cutting tip. The intention is that high pressure liquid issueing from the nozzle will degrade the rock before it is attacked by the cutting tip.
Inventors
- 👤 Peter N. Tomlinson
- 👤 Klaus Tank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:59
CPC Classifications
E; E21; E21C; E21C35/00; E21C35/18; E21C35/187; E21C35/183; E21C35/1835; E21C35/1837
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
154 words
A cutter pick for a mining machine, the cutter pick comprising: (a) a lug; (b) a cutting insert at a forward end of the lug, the cutting insert including a forward layer of hard, abrasion resistant material presenting a planar cutting face carried by a carbide backing, said carbide backing secured to a carbide body which is secured to the lug; and (c) a passage extending forwardly through the lug from the rearward end of the lug, through the carbide backing and through the forward layer so as to vent through the cutting face, the passage at its rearward end being connectable to a source of high pressure liquid and with its forward end, at a location inside the carbide backing, undergoing a reduction in cross-section so that, in use, a high pressure jet of liquid issues through the cutting face to impinge on and degrade a rock face ahead of the cutting insert.
Claim 2
Dependent Claim
154 words
A cutter pick for a mining machine, the cutter pick comprising: (a) a lug; (b) a cutting insert at a forward end of the lug, the cutting insert including a forward layer of hard, abrasion resistant material presenting a planar cutting face carried by a carbide backing, said carbide backing secured to a carbide body which is secured to the lug; and (c) a passage extending forwardly through the lug from the rearward end of the lug, through the carbide backing and through the forward layer so as to vent through the cutting face, the passage at its rearward end being connectable to a source of high pressure liquid and with its forward end, at a location inside the carbide backing, undergoing a reduction in cross-section so that, in use, a high pressure jet of liquid issues through the cutting face to impinge on and degrade a rock face ahead of the cutting insert.
Claim 3
Dependent Claim
21 words
A cutter pick according to claim 1 wherein the forward end of the passage vents normally to the planar cutting face.
Claim 4
Dependent Claim
24 words
A cutter pick according to claim 1 wherein the forward end of the passage vents at an acute angle to the planar cutting face.
Claim 5
Dependent Claim
36 words
A cutter pick according to claim 1 wherein the rearward end of the passage is enlarged relative to the remainder of the passage for reception of a spigot connected to a supply of high pressure liquid.
Claim 6
Dependent Claim
25 words
A cutter pick according to claim 1 wherein the forward layer of hard, abrasion resistant material is one of a PCD layer and CNB layer.
Claim 7
Dependent Claim
32 words
A cutter pick according to claim 1 wherein the reduction in cross-section of the passage inside the carbide backing ends substantially adjacent to the surface of the backing bordering the forward layer.
References Cited (Backward Citations)
US4280735A
Cited
DE2817796A1
Cited
GB2041043A
Cited
GB2087949A
Cited
GB2113743A
Cited
US4678237A
Cited
DE3403344A1
Cited
GB2174025A
Cited
US4606418A
Cited
US4765687A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-19 | 1993-08-21 | 1994-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-19 | 1997-08-21 | 1998-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-19 | 2001-08-21 | 2002-02-20 | $7700.00 | Window Closed / Lapsed |