Patent US4556750A successfully refreshed from Google Patents.
Patent US3855848A successfully refreshed from Google Patents.
US3855848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hardness testing machine
Assignee: SKF Compagnie dApplications Mecaniques SA
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Filing: 1972-12-12
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Granted: 1974-12-24
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Expires: 1992-12-12
Abstract
Abstract A machine for testing hardness by the Rockwell method and apparatus includes a single lever permanently supporting a preloading weight positioned on the same side of the lever fulcrum as the operative connection of the lever to a penetrator, and, on the free end of the lever, an attachment to a main weight, all moving parts being articulated and guided exclusively by transversely elastically flexible but longitudinally nonextensible blades which are restrained at their ends.
Inventors
- 👤 M Sidler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:28
CPC Classifications
G; G01; G01N; G01N3/00; G01N3/40; G01N3/42; G01N3/44
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
192 words
In a machine for testing the hardness of material by the Rockwell testing method, of the type including, in its frame, a single pivoted lever permanently supporting a minor preloading weight positioned on the same side of the lever fulcrum as means for operatively associating the lever with a penetrator having a point, and having, at its free end, means for attaching it to a major loading weight, the improvement comprising said fulcrum being formed by a pair of crossed first blades secured to said lever and forming an articulation therefor; second and third blades secured at their free ends respectively to said penetrator and to said major weight, and having fixed ends secured to said frame, said second and third blades respectively guiding said penetrator and said major weight; said means for operatively associating said lever with said penetrator being constituted by a fourth blade secured to said penetrator and engaging said lever; said blades being elastically flexible transversely but non-extensible longitudinally; said crossed first blades constituting the sole means articulating said lever, and said second and third blades constituting the sole means respectively guiding said penetrator and said major weight.
Claim 2
Dependent Claim
192 words
In a machine for testing the hardness of material by the Rockwell testing method, of the type including, in its frame, a single pivoted lever permanently supporting a minor preloading weight positioned on the same side of the lever fulcrum as means for operatively associating the lever with a penetrator having a point, and having, at its free end, means for attaching it to a major loading weight, the improvement comprising said fulcrum being formed by a pair of crossed first blades secured to said lever and forming an articulation therefor; second and third blades secured at their free ends respectively to said penetrator and to said major weight, and having fixed ends secured to said frame, said second and third blades respectively guiding said penetrator and said major weight; said means for operatively associating said lever with said penetrator being constituted by a fourth blade secured to said penetrator and engaging said lever; said blades being elastically flexible transversely but non-extensible longitudinally; said crossed first blades constituting the sole means articulating said lever, and said second and third blades constituting the sole means respectively guiding said penetrator and said major weight.
Claim 3
Dependent Claim
37 words
A machine according to claim 1 in which the major weight is provided with a hook which cooperates, with intermediate clearance, with the tapering inner edges of a coupling ring supported on the end of said lever.
Claim 4
Dependent Claim
18 words
A machine according to claim 2, including powered lifting and lowering means operatively associated with said major weight.
Claim 5
Dependent Claim
45 words
A machine according to claim 1, further including a dial gauge having a feeler; and an electrically operated clutch member interposed between said penetrator and said dial gauge feeler and selectively operable to directly couple said penetrator and said dial gauge feeler to each other.
Claim 6
Dependent Claim
70 words
A machine according to claim 3, including a motor-rotatated cam, constituting the major weight lifting and lowering means, and having a plurality of lobes thereon providing at least three steps with progressive blending lands therebetween; a plate forming a component of said major load; a rod supporting said plate; a follower on the lower end of said rod engaging said cam; and a controllable motor operable to rotate said cam.
Claim 7
Dependent Claim
44 words
A machine according to claim 5, including additional weights selectively usable to form components of said major load; and means, including light, flexible inextensible ties connected to said additional weights and operable to suspend said weights and to deposit the same on said plate.
Claim 8
Dependent Claim
35 words
A machine according to claim 6, including means inside said machine operatively associated with each tie and operable to vary the length of the associated tie; and latching means cooperable with said length varying means.
Claim 9
Dependent Claim
88 words
A machine according to claim 5, including a base; an arm; a column connecting said base to said arm; said base containing said cam and its driving motor; said column enclosing said rod and cam follower; said plate positioned substantially at the midpoint of said rod; said arm containing said single lever, said blades, said penetrator, and said minor pre-loading weight; saiD arm having a head forming a control panel; and a timer setting means, a major-load adjusting means and a dial-gauge reading window on said control panel.
Claim 10
Dependent Claim
20 words
A machine according to claim 4 including means for signalling the measurement cycle period in the course of the test.
Claim 11
Dependent Claim
36 words
A machine according to claim 3 comprising means for varying the test conditions, including an adjustable timer for rendering the major-weight actuating means inoperative for a predetermined time and means for varying said major weight itself.
Claim 12
Dependent Claim
32 words
A machine according to claim 1, including a penetrator point protector elastically mounted on the machine frame and comprising thrust members which limit its movement responsive to approach of the test specimen.
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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) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |