EP0187628A2
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EP
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Drill element for percussion drilling
Assignee: Santrade Ltd
•
Filing: 1985-12-17
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Granted: —
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Expires: 2005-12-17
Abstract
Abstract This invention relates to a drill element (10; 11; 12) for percussion drilling, said element having a cylindrical screw thread (13; 14; 15) having one single entry. The screw thread, that is intended for thread diameters of less than 30 mm, has a pitch (s) of less than 12 mm, a shoulder angle (β) of more than 21°, and a pitch angle (α) of less than 11° but more than 5.6°.
Inventors
- 👤 Kjell-Ove Jansson
- 👤 Lars Liljeblad
- 👤 Sören Liljekvist
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 07:54
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B17/042; E21B17/0426; Y; Y10; Y10T; Y10T403/00; Y10T403/57; Y10T403/5746
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
114 words
Drill element for percussion drilling, e.g. a drill rod (10;11), a coupling sleeve (12) or a drill bit, said drill element (10;11;12) having a female (15) or male (13; 14) cylindrical screw thread having an external diameter less than 30 mm, preferably less than 25 mm, and one single entry, said drill element (10;11;12) is intended to be coupled up to another element included in a percussion drill string, characterized in that the pitch (s) of the screw thread is less than 12 mm, the shoulder angle (β) of said screw thread is more than 21°, and that the pitch angle (α) of said screw thread is less than 11° but more than 5.6°.
Claim 2
Dependent Claim
114 words
Drill element for percussion drilling, e.g. a drill rod (10;11), a coupling sleeve (12) or a drill bit, said drill element (10;11;12) having a female (15) or male (13; 14) cylindrical screw thread having an external diameter less than 30 mm, preferably less than 25 mm, and one single entry, said drill element (10;11;12) is intended to be coupled up to another element included in a percussion drill string, characterized in that the pitch (s) of the screw thread is less than 12 mm, the shoulder angle (β) of said screw thread is more than 21°, and that the pitch angle (α) of said screw thread is less than 11° but more than 5.6°.
Claim 3
Dependent Claim
27 words
Drill element according to claim 1, character- ized in that the pitch angle (α) is within the interval 5.6° to 7.6°, preferably in the magnitude of 6.6°.
Claim 4
Dependent Claim
23 words
Drill element according to claim 1 or 2, char- acterized in that the pitch (s) is less than 9 mm, preferably 7.5 mm.
Claim 5
Dependent Claim
41 words
Drill element according to any one of the preceding claims, characterized in that the radius of curvature (R) at the top of the screw thread is less than 6.0 mm, with preference for values less than 4 mm, preferably 3.0 mm.
Claim 6
Dependent Claim
22 words
Drill element according to any one of the preceding claims, characterized in that the shoulder angle (β) has a magnitude of 30°.
Claim 7
Dependent Claim
22 words
Drill element according to any one of the preceding claims, characterized in that the profile depth (d) is less than 1.6 mm.
Claim 8
Dependent Claim
22 words
Drill element according to claim 6, character- ized in that the profile depth (d) is less than 1.5 mm, preferably 1.35 mm.
Claim 9
Dependent Claim
30 words
Drill element according to any one of the preceding claims, characterized in that the relationship between the radius of curvature (R) and the profile depth (d) is less than 3.75.
Claim 10
Dependent Claim
32 words
Drill element according to claim 8, character- ized in that the relationship between the radius of curvature (R) and the profile depth is less than 2.6, preferably in the magnitude of 2.2.
Claim 11
Dependent Claim
81 words
Drill element according to any one of the preceding claims, characterized in that the screw thread mainly has a convex or a concave shape, the radius of curvature (r) at the bottom of the screw thread being somewhat less, preferably 0.5 mm, than the radius of curvature (R) at the top of the screw thread, the radius of curvature (r) at the bottom of the screw thread being preferably 2.5 mm, and that said radii of curvature (R,r) have constant values.
Claim 12
Dependent Claim
9 words
European Patent Application No. 85850399.8 - Applicant: Santrade Ltd
Claim 13
Dependent Claim
9 words
European Patent Application No. 85850399.8 - Applicant: Santrade Ltd
Claim 14
Dependent Claim
31 words
This is a request according to Rule 88 of the Regulations to correct errors in the description, claims and abstract of the above-mentioned application. The corrected documents are enclosed in triplicate.
Claim 15
Dependent Claim
62 words
Most of the corrections are caused by the fact that the definition of the shoulder angle was changed in the present application compared to that of the original Swedish patent application from which priority is claimed. However, said change in definition had the consequence that the stated values of the shoulder angle also were changed. Below we have listed the corrections made.
Claim 16
Dependent Claim
15 words
On page 2, line 34 "21 o " has been replaced by "69 o ".
Claim 17
Dependent Claim
15 words
On page 2, line 34 "21 o " has been replaced by "69 o ".
Claim 18
Dependent Claim
17 words
On page 3, formula (1) "β" is inserted after "cos" in the denominator of the first term.
Claim 19
Dependent Claim
17 words
On page 3, formula (1) "β" is inserted after "cos" in the denominator of the first term.
Claim 20
Dependent Claim
12 words
On page 3, line 9 "β" is inserted before "= the shoulder..".
Claim 21
Dependent Claim
12 words
On page 3, line 9 "β" is inserted before "= the shoulder..".
Claim 22
Dependent Claim
12 words
On page 3, line 10 "α" is inserted.before "= the pitch angle".
Claim 23
Dependent Claim
12 words
On page 3, line 10 "α" is inserted.before "= the pitch angle".
Claim 24
Dependent Claim
27 words
On page 4, lines 23 and 24 "... increased i e β 21 o ..." is replaced by "... decreased, i e β < 69 o ...".
Claim 25
Dependent Claim
27 words
On page 4, lines 23 and 24 "... increased i e β 21 o ..." is replaced by "... decreased, i e β < 69 o ...".
Claim 26
Dependent Claim
10 words
On page 5, line 8 "...30°..." is replaced by "...60°...".
Claim 27
Dependent Claim
10 words
On page 5, line 8 "...30°..." is replaced by "...60°...".
Claim 28
Dependent Claim
19 words
In claim 1, line 12, "... more than 21 0 ..." is replaced by "... less than 69 ...".
Claim 29
Dependent Claim
8 words
In claim 5 "...30°..." is replaced by "...60°...".
Claim 30
Dependent Claim
19 words
In the abstract, line 8 "... more than 21 0 ..." is replaced by "... less than 69°...". .../2
Claim 31
Dependent Claim
19 words
In the abstract, line 8 "... more than 21 0 ..." is replaced by "... less than 69°...". .../2
Claim 32
Dependent Claim
27 words
Also the term "profiles depth d" is throughout the anpli- cation replaced by the term "protiles height h". Profile height and profile depth is the same thing.
Claim 33
Dependent Claim
27 words
Also the term "profiles depth d" is throughout the anpli- cation replaced by the term "protiles height h". Profile height and profile depth is the same thing.
Claim 34
Dependent Claim
19 words
All of the corrections are of formal nature and hence the scope of the invention has not been affected.
Claim 35
Dependent Claim
19 words
All of the corrections are of formal nature and hence the scope of the invention has not been affected.
Claim 36
Dependent Claim
2 words
Santrade Limited
Claim 37
Dependent Claim
2 words
Santrade Limited
Claim 38
Dependent Claim
2 words
Lennart Taquist
Claim 39
Dependent Claim
2 words
Lennart Taquist
References Cited (Backward Citations)
No citation records indexed.
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