US3666022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Striking bar
Assignee: Sullivan Machinery Co
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Filing: 1970-11-23
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Granted: 1972-05-30
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Expires: 1990-11-23
Abstract
Abstract A striking bar of a type utilized in a percussive tool, such as a hammer rock drill, and more particularly a striking bar having a bearing portion thereof provided with stress distributing means such that stresses in the bearing portion of the striking bar due to bending and impact occur primarily in sections of the bearing portion other than sections thereof where heat cracking or friction welding can occur.
Inventors
- 👤 Edward A Bailey
- 👤 James F Ordway
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:49
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B17/042
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
101 words
A striking bar of a type utilized in percussive rock drilling comprising: a member having a chuck driver portion, a threaded portion axially spaced from said driver portion for coupling to a drill string, and a bearing portion connecting said driver portion to said coupling portion; said bearing portion being coaxial with and extending axially between said driver portion and said threaded portion and being rotatably supportable by a bushing assembly adjacent the outermost periphry thereof; and stress distributing means extending inwardly from the outermost periphery of said bearing portion and along at least an intermediate section of said bearing portion.
Claim 2
Dependent Claim
101 words
A striking bar of a type utilized in percussive rock drilling comprising: a member having a chuck driver portion, a threaded portion axially spaced from said driver portion for coupling to a drill string, and a bearing portion connecting said driver portion to said coupling portion; said bearing portion being coaxial with and extending axially between said driver portion and said threaded portion and being rotatably supportable by a bushing assembly adjacent the outermost periphry thereof; and stress distributing means extending inwardly from the outermost periphery of said bearing portion and along at least an intermediate section of said bearing portion.
Claim 3
Dependent Claim
30 words
A striking bar as specified in claim 1 wherein said stress distributing means comprise a plurality of axially spaced annular grooves coaxial with the central axis of said bearing portion.
Claim 4
Dependent Claim
27 words
A striking bar as specified in claim 1 wherein said stress distributing means comprises at least one annular groove intermediate the axial ends of said bearing portion.
Claim 5
Dependent Claim
28 words
A striking bar as specified in claim 1 wherein the section modulus at the smallest cross-section of the bearing portion is sufficient to withstand normal working bending stresses.
Claim 6
Dependent Claim
39 words
A striking bar as specified in claim 1 wherein said stress distrIbuting means defines at least one section of said bearing portion across which at least a major portion of the bending applied to said bearing portion is distributed.
Claim 7
Dependent Claim
39 words
A striking bar as specified in claim 1 wherein said stress distributing means defines a plurality of sections of said bearing portion across which at least a major portion of the bending applied to said bearing portion is distributed.
Claim 8
Dependent Claim
24 words
A striking bar as specified in claim 1 wherein the respective outermost peripheral portions of said bearing portion are of a substantially equal diameter.
Claim 9
Dependent Claim
21 words
A striking bar as set forth in claim 7 wherein said threads on said threaded portion have substantially equal root diameters.
Claim 10
Dependent Claim
23 words
A striking bar as specified in claim 1 including a coaxial through bore extending axially through said member along the central axis thereof.
Claim 11
Dependent Claim
17 words
A striking bar as specified in claim 9 wherein said bore is of a substantially constant diameter.
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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |