US4386670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boring head with extension elements
Assignee: Santrade Ltd
•
Filing: 1981-04-23
•
Granted: 1983-06-07
•
Expires: 2001-04-23
Abstract
Abstract A boring head for reaming a pre-drilled hole in raise boring or for similar earth cutting operations comprising a plurality of roller cutters (13-22). For purposes of extending the radius of the boring head (10) in operation or decreasing its dimensions during transport one or several extension elements (36, 37) are provided for detachable attachment to the boring head (10) by means of a wedge connection (42).
Inventors
- 👤 Gustav L. Westermark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:04
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/20; E21B7/00; E21B7/28; Y; Y10; Y10T; Y10T407/00; Y10T407/19; Y10T407/1906; Y10T407/1908; Y10T407/192; Y10T407/1922; Y10T407/1934; Y10T407/1938
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
120 words
A boring head for rotary boring of the face of earth formations comprising: a rotary carrier including an abutment, and a first surface which faces generally radially outwardly, a plurality of roller cutters, mounting means for mounting said roller cutters on said rotary carrier, an extension element for extending the boring head radially, said extension element carrying a roller cutter and including a second surface facing generally radially inwardly, and wedge means engaging said first and second surfaces for forcing said extension element radially outwardly against said abutment, said at least one roller cutter being located such that forces imposed on said extension element during a boring operation are so directed as to urge said extension element against said abutment.
Claim 2
Dependent Claim
120 words
A boring head for rotary boring of the face of earth formations comprising: a rotary carrier including an abutment, and a first surface which faces generally radially outwardly, a plurality of roller cutters, mounting means for mounting said roller cutters on said rotary carrier, an extension element for extending the boring head radially, said extension element carrying a roller cutter and including a second surface facing generally radially inwardly, and wedge means engaging said first and second surfaces for forcing said extension element radially outwardly against said abutment, said at least one roller cutter being located such that forces imposed on said extension element during a boring operation are so directed as to urge said extension element against said abutment.
Claim 3
Dependent Claim
49 words
A boring head according to claim 1, wherein one of said carrier and extension element includes an axially directed projection engaging within a groove of the other of said support and extension element, said abutment being defined by whichever of said projection and groove is disposed on said carrier.
Claim 4
Dependent Claim
52 words
A boring head according to claim 2, wherein said carrier includes a plate, a connection member mounted to an underside of said plate, said projection being disposed on said connection member and defining said abutment, said extension member including a support plate, said groove disposed in an underside of said support plate.
Claim 5
Dependent Claim
21 words
A boring head according to claim 3, wherein said wedge means includes opposing wedge surfaces which converge toward said connection member.
Claim 6
Dependent Claim
23 words
A boring head according to claim 4, wherein said connection member includes a top surface having a recess disposed under said wedge means.
Claim 7
Dependent Claim
32 words
A boring head according to claim 3 including at least one bolt extending through said wedge means and said connection member for forcing said wedge means against said first and second surfaces.
Claim 8
Dependent Claim
47 words
A boring head according to claim 3 including at least one radially directed fastener for connecting said extension to said carrier, said fastener being disposed behind said projection relative to the direction of advancement of the boring head for preventing said extension from swinging about said projection.
Claim 9
Dependent Claim
27 words
A boring head according to claim 2, wherein said rotary carrier includes an outer circumferential wall, said projection comprising an axial extension of said outer circumferential wall.
Claim 10
Dependent Claim
109 words
An extension element adapted to be mounted on a rotary carrier of a boring head to extend the boring head radially, said extension element comprising: at least one roller cutter, a supporting plate carrying said roller cutter, said supporting plate being connectible to the rotary carrier and including: a generally radially inwardly facing side surface which is inclined relative to vertical to define a wedge surface arranged to be acted upon by a wedge for forcing said supporting plate radially outwardly, and an abutting surface which faces generally radially outwardly and is arranged to engage an abutment of the rotary carrier as said supporting surface is wedge radially outwardly.
Claim 11
Dependent Claim
109 words
An extension element adapted to be mounted on a rotary carrier of a boring head to extend the boring head radially, said extension element comprising: at least one roller cutter, a supporting plate carrying said roller cutter, said supporting plate being connectible to the rotary carrier and including: a generally radially inwardly facing side surface which is inclined relative to vertical to define a wedge surface arranged to be acted upon by a wedge for forcing said supporting plate radially outwardly, and an abutting surface which faces generally radially outwardly and is arranged to engage an abutment of the rotary carrier as said supporting surface is wedge radially outwardly.
Claim 12
Dependent Claim
49 words
An extension element according to claim 9, wherein said supporting surface includes a groove in an underside thereof, said groove extending generally parallel to said side surface and arranged to receive the abutment of the rotary carrier such that a side wall of said groove defines said abutting surface.
Claim 13
Dependent Claim
18 words
An extension element according to claim 9, wherein said side surface slopes radially outwardly in the drilling direction.
Claim 14
Dependent Claim
65 words
An extension element for extending a boring head radially comprising a supporting plate which carries at least one roller cutter, said supporting plate having a radially inward side surface, said side surface sloping radially outwards in the drilling direction for providing a wedge surface, a groove being provided in the bottom surface of the supporting plate, said groove extending generally parallel to the side surface.
Claim 15
Dependent Claim
65 words
An extension element for extending a boring head radially comprising a supporting plate which carries at least one roller cutter, said supporting plate having a radially inward side surface, said side surface sloping radially outwards in the drilling direction for providing a wedge surface, a groove being provided in the bottom surface of the supporting plate, said groove extending generally parallel to the side surface.
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) | 1986-06-06 | 1986-12-06 | 1987-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-06 | 1990-12-06 | 1991-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-06 | 1994-12-06 | 1995-06-07 | $7700.00 | Window Closed / Lapsed |