US3754436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hardness testing apparatus
Assignee: Individual
•
Filing: 1972-08-31
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Granted: 1973-08-28
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Expires: 1992-08-31
Abstract
Abstract A hardness testing apparatus of the indenter type wherein the work is held against movement during indentation by a fluidactuated indenter and subsequent measurement of the indentation by a laser-scanner-photoreader carried by the test head.
Inventors
- 👤 R Saxton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:54
CPC Classifications
G; G01; G01N; G01N3/00; G01N3/40; G01N3/42; G01N2203/00; G01N2203/0098
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
107 words
In a hardness testing apparatus: a worktable; a test head comprising a tubular member facing in the direction of said worktable and an indenter selectively projectable towards said worktable through said member; means for producing relative movement between said worktable and said member to clamp therebetween an article the hardness of which is to be tested; means for retracting said indenter from an article being tested while clamped between said member and said worktable; and a laser-scanner-photoreader fixed with respect to said member for measuring, while the article being tested remains clamped between said member and said worktable, an indentation made in the article by said indenter.
Claim 2
Dependent Claim
107 words
In a hardness testing apparatus: a worktable; a test head comprising a tubular member facing in the direction of said worktable and an indenter selectively projectable towards said worktable through said member; means for producing relative movement between said worktable and said member to clamp therebetween an article the hardness of which is to be tested; means for retracting said indenter from an article being tested while clamped between said member and said worktable; and a laser-scanner-photoreader fixed with respect to said member for measuring, while the article being tested remains clamped between said member and said worktable, an indentation made in the article by said indenter.
Claim 3
Dependent Claim
125 words
In a hardness testing apparatus: a worktable; a test head comprising a hydraulic cylinder having a reciprocable plunger thereIn and a tubular member facing in the direction of said worktable; an indenter carried by said plunger and selectively projectable towards said worktable through said member; means for reciprocating said worktable toward and away from said member to clamp and unclamp an article the hardness of which is to be tested against said member; means for reciprocating said indenter to and from an article being tested while clamped by said worktable against said member; and a laser-scanner-photoreader fixed with respect to said member for measuring while the article remains clamped between said worktable and said clamp member an indentation made in the article by said indenter.
Claim 4
Dependent Claim
125 words
In a hardness testing apparatus: a worktable; a test head comprising a hydraulic cylinder having a reciprocable plunger thereIn and a tubular member facing in the direction of said worktable; an indenter carried by said plunger and selectively projectable towards said worktable through said member; means for reciprocating said worktable toward and away from said member to clamp and unclamp an article the hardness of which is to be tested against said member; means for reciprocating said indenter to and from an article being tested while clamped by said worktable against said member; and a laser-scanner-photoreader fixed with respect to said member for measuring while the article remains clamped between said worktable and said clamp member an indentation made in the article by said indenter.
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |