Patent US3926265A successfully refreshed from Google Patents.
US3926265A
Expired / Lapsed
US
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Drill steel for percussive drilling devices
Assignee: JPMorgan Chase Bank NA
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Filing: 1974-06-10
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Granted: 1975-12-16
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Expires: 1994-06-10
Abstract
Abstract A drill string for use with percussive type drills for rock drilling is described. The drill string has sections of drill steel in which a steel core, which acts as a transmission line for the force pulses generated by the hammer of the drill, is protected from scoring (as from rocks or adjacent metal objects) by sheathing which is attached to the core by resilient members to define a mass spring system in which the sheathing and pulse transmission member are dynamically isolated from each other at the repetition frequency of the force pulses. The sections are connected by coupling joints of the drill string. A breakout mechanism may be incorporated into each section to break out the joints, in which lugs extending from the core engage the sheathing during breakout to protect the resilient member during breakout. The resilient members are constructed so as to be provided with sufficient longitudinal and torsional stiffness such that during normal drilling the lugs are isolated from the sheathing and do not produce galling or other damage.
Inventors
- 👤 John V Bouyoucos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:42
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B17/042; E21B17/0426; E21B17/10; E21B17/1042; E21B21/00
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
161 words
Drill steel for use with percussive tools which generate force pulses at a certain repetition frequency comprising: a. a force pulse transmission member, b. a sheathing surrounding said member, said sheathing being spaced from said transmission member to define a chamber separating said member from said sheathing, and c. means in said chamber connecting said sheathing and said transmission member to cause said sheathing to have a resonant frequency for motion of said sheathing in the direction of force pulse transmission along said transmission member which resonant frequency is below the force pulse transmission frequency whereby said sheathing is dynamically isolated from said transmission member, said means comprising a resilient member of elastic material located in said chamber and connecting said sheathing and said transmission member, said sheathing having a certain mass and said resilient member having a certain compliance related to the mass of said sheathing together to constitute a mass spring system which is resonant at said resonant frequency.
Claim 2
Dependent Claim
161 words
Drill steel for use with percussive tools which generate force pulses at a certain repetition frequency comprising: a. a force pulse transmission member, b. a sheathing surrounding said member, said sheathing being spaced from said transmission member to define a chamber separating said member from said sheathing, and c. means in said chamber connecting said sheathing and said transmission member to cause said sheathing to have a resonant frequency for motion of said sheathing in the direction of force pulse transmission along said transmission member which resonant frequency is below the force pulse transmission frequency whereby said sheathing is dynamically isolated from said transmission member, said means comprising a resilient member of elastic material located in said chamber and connecting said sheathing and said transmission member, said sheathing having a certain mass and said resilient member having a certain compliance related to the mass of said sheathing together to constitute a mass spring system which is resonant at said resonant frequency.
Claim 3
Dependent Claim
28 words
The invention as set forth in claim 1 wherein said force pulse transmission member is a core and said sheathing is a tubular member surrounding said transmission member.
Claim 4
Dependent Claim
20 words
The invention as set forth in claim 2 wherein said transmission member and said sheathing are both constructed of steel.
Claim 5
Dependent Claim
17 words
The invention as set forth in claim 2 wherein said resilient memBer is constituted of elastomeric material.
Claim 6
Dependent Claim
15 words
The invention as set forth in claim 4 wherein said material substantially fills said chamber.
Claim 7
Dependent Claim
31 words
The invention as set forth in claim 4 wherein said resilient member includes a plurality of annuluses of said material, spaced from each other in a longitudinal direction, along said core.
Claim 8
Dependent Claim
32 words
The invention as set forth in claim 6 wherein said annuluses each have a plurality of openings extending axially therebetween and providing channels for the flow of cleansing fluid through said chamber.
Claim 9
Dependent Claim
24 words
The invention as set forth in claim 4 wherein said elastomeric material is bonded at least to one of said sheathing and said core.
Claim 10
Dependent Claim
18 words
The invention as set forth in claim 4 wherein said core is a rod having planar longitudinal faces.
Claim 11
Dependent Claim
24 words
The invention as set forth in claim 9 wherein said faces define a hexagon in a plane normal to the axis of the rod.
Claim 12
Dependent Claim
38 words
The invention as set forth in claim 2 including a joint adapted to be secured at the end of said core, said coupling joint having a coupling member, said coupling member and sheathing being spaced from each other.
Claim 13
Dependent Claim
79 words
The invention as set forth in claim 2 further comprising a joint for interconnecting successive sections of said drill steel into a drill string, said joint including a coupling member for engaging the ends of said successive sections, a sleeve around said coupling member, and a resilient member disposed between said sleeve and coupling member, holding said sleeve and coupling member in assembled relationship and dynamically isolating said sleeve from said coupling member at said force pulse repetition frequency.
Claim 14
Dependent Claim
27 words
The invention as set forth in claim 12 wherein said sleeve is spaced longitudinally from said sheathing so as to be out of contact with each other.
Claim 15
Dependent Claim
21 words
The invention as set forth in claim 12 wherein said sleeve and said sheathing are of substantially the same outside diameter.
Claim 16
Dependent Claim
44 words
The invention as set forth in claim 12 wherein said resilient member which is disposed between said coupling member and its sleeve is comprised of a plurality of rings of elastomeric material spaced from each other in a direction longitudinally of said coupling member.
Claim 17
Dependent Claim
96 words
The invention as set forth in claim 12 wherein said sleeve around said coupling member has first and second pluralities of holes, said first plurality of holes being spaced around said sleeve near one end thereof, said second plurality of holes being spaced around said coupling member sleeve near the end thereof opposite to said one end, and lug means extending laterally from said coupling member sleeve into said holes, said lug means being smaller than the holes through which they extend so that clearance is provided between said coupling member sleeve and said lug means.
Claim 18
Dependent Claim
27 words
The invention as set forth in claim 16 wherein said lug means are provided by bolts extending radially into said coupling member threadly engaging said coupling member.
Claim 19
Dependent Claim
33 words
The invention as set forth in claim 2 wherein said core is polyogonal in cross section and the said tubular sheathing member at the opposite ends thereof is swaged inwardly toward said core.
Claim 20
Dependent Claim
107 words
A drill steel for use with a percussive tool, said steel comprising: a. an elongated core member for transmitting force pulses generated by said tool, b. a tubular sheathing disposed around and radially spaced from said core member, said sheathing extending substantially the entire length of said core member, c. an annular member of elastomeric material disposed between said sheathing and said core member, said annular member holding said sheathing spaced from said core member and in assembled relationship therewith, and d. breakout means for separating said steel from a coupling member, said breakout means including members projecting from said core member and spaced from said sheathing.
Claim 21
Dependent Claim
107 words
A drill steel for use with a percussive tool, said steel comprising: a. an elongated core member for transmitting force pulses generated by said tool, b. a tubular sheathing disposed around and radially spaced from said core member, said sheathing extending substantially the entire length of said core member, c. an annular member of elastomeric material disposed between said sheathing and said core member, said annular member holding said sheathing spaced from said core member and in assembled relationship therewith, and d. breakout means for separating said steel from a coupling member, said breakout means including members projecting from said core member and spaced from said sheathing.
Claim 22
Dependent Claim
41 words
The invention as set forth in claim 19 wherein said breakout means includes a plurality of said projecting members, sAid sheathing having openings through which said projecting members extend, said openings being larger than said projecting members to provide clearance therebetween.
Claim 23
Dependent Claim
19 words
The invention as set forth in claim 20 wherein said openings are slots and said projecting members are lugs.
Claim 24
Dependent Claim
19 words
The invention as set forth in claim 21 wherein said slots extend longitudinally from the ends of said sheathing.
Claim 25
Dependent Claim
48 words
The invention as set forth in claim 21 wherein said lugs are rectangular in cross section and said openings are rectangular, having sides which correspond to the sides of said lugs, each side of said openings being larger than a corresponding side of the lug which projects therein.
Claim 26
Dependent Claim
42 words
The invention as set forth in claim 20 wherein the ends of said sheathing are flared inwardly toward said core, said opening being in said flared ends, and said projecting members having a length less than the diameter of said flared ends.
Claim 27
Dependent Claim
22 words
The invention as set forth in claim 20 wherein said projecting members are provided by a pin extending laterally through said core.
Claim 28
Dependent Claim
37 words
The invention as set forth in claim 25 wherein a plurality of said pins are provided each disposed in a separate plane space axially of said core, the axis of said pins being transverse to each other.
Claim 29
Dependent Claim
48 words
The invention as set forth in claim 19 wherein said members of said breakout means consist of a portion of said core at one end thereof, said portion having surfaces forming a nut, said sheathing being of length less than said core and terminating before reaching said nut.
Claim 30
Dependent Claim
27 words
The invention as set forth in claim 27, wherein said annular member has a lip extending between said nut and said sheathing to provide a bumper therebetween.
Claim 31
Dependent Claim
88 words
The invention as set forth in claim 19 further comprising a joint having a coupling member for securing the cores of successive sections of said drill steel to form a drill string, said annular member comprises a plurality of annuluses longitudinally spaced from each other along said core member and wherein one of said plurality of annuluses is disposed at the end of said sheathing, said one annulus having a lip extending radially outward to form a bumper between said coupling member and the end of said sheathing.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |