Patent US3717025A successfully refreshed from Google Patents.
US3717025A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for determining coefficient of friction
Assignee: Caterpillar Inc
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Filing: 1971-03-01
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Granted: 1973-02-20
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Expires: 1991-03-01
Abstract
Abstract An apparatus for obtaining data equatable to the static and dynamic coefficients of friction of the working surface of a friction disc comprises fixture means for mounting and holding the disc for limited pivotal movement about an axes disposed parallel to the central, longitudinal axis of the disc, load application means for urging the working surface of the disc into engagement with a rotating surface to induce pivoting of the fixture and disc, and means for indicating and ascertaining the torque applied to the disc by the rotating surface, including a strain-gaged torque link and associated recording equipment.
Inventors
- 👤 F Kronenberg
- 👤 A Olson
- 👤 J Poirot
- 👤 G Rohweder
- 👤 H Winkler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:10
CPC Classifications
G; G01; G01N; G01N19/00; G01N19/02
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
118 words
An apparatus for obtaining the coefficient of friction of the surface of a test sample comprising fixture means fixedly mounting a test sample thereon, said fixture means mounted for limited pivotal movement about a pivot axis in said apparatus, rotating means having a surface positioned adjacent to said fixture means and rotatably engaging a surface of the test sample to induce pivoting of said fixture means about said pivot axis, load application means for pressing the surface of said rotating means and the surface of the test sample together under a predetermined force, and torque indicator means responsive to pivotal movement of said fixture means for indicating the torque applied to the test sample by said rotating means.
Claim 2
Independent Claim
118 words
An apparatus for obtaining the coefficient of friction of the surface of a test sample comprising fixture means fixedly mounting a test sample thereon, said fixture means mounted for limited pivotal movement about a pivot axis in said apparatus, rotating means having a surface positioned adjacent to said fixture means and rotatably engaging a surface of the test sample to induce pivoting of said fixture means about said pivot axis, load application means for pressing the surface of said rotating means and the surface of the test sample together under a predetermined force, and torque indicator means responsive to pivotal movement of said fixture means for indicating the torque applied to the test sample by said rotating means.
Claim 3
Independent Claim
118 words
An apparatus for obtaining the coefficient of friction of the surface of a test sample comprising fixture means fixedly mounting a test sample thereon, said fixture means mounted for limited pivotal movement about a pivot axis in said apparatus, rotating means having a surface positioned adjacent to said fixture means and rotatably engaging a surface of the test sample to induce pivoting of said fixture means about said pivot axis, load application means for pressing the surface of said rotating means and the surface of the test sample together under a predetermined force, and torque indicator means responsive to pivotal movement of said fixture means for indicating the torque applied to the test sample by said rotating means.
Claim 4
Independent Claim
118 words
An apparatus for obtaining the coefficient of friction of the surface of a test sample comprising fixture means fixedly mounting a test sample thereon, said fixture means mounted for limited pivotal movement about a pivot axis in said apparatus, rotating means having a surface positioned adjacent to said fixture means and rotatably engaging a surface of the test sample to induce pivoting of said fixture means about said pivot axis, load application means for pressing the surface of said rotating means and the surface of the test sample together under a predetermined force, and torque indicator means responsive to pivotal movement of said fixture means for indicating the torque applied to the test sample by said rotating means.
Claim 5
Dependent Claim
38 words
The invention of claim 1 wherein said fixture means comprises a vertically disposed member, means for releasably detaching a test sample on said member and a horizontally disposed shaft having said member attached to a first end thereof.
Claim 6
Dependent Claim
36 words
The invention of claim 2 wherein said shaft is mounted for axial movement along and rotatioNal movement about said axis and wherein said load application means is operatively connected to a second end of said shaft.
Claim 7
Dependent Claim
25 words
The invention of claim 2 wherein said torque indicator means comprises a flexible link attached at one end thereof to said shaft for rotation therewith.
Claim 8
Dependent Claim
50 words
The invention of claim 4 wherein said torque indicator means further comprises means fixedly mounted in said apparatus, adjacent to said link, for engaging and bending said link in response to pivoting of said member and strain gage means attached to said link adjacent to its point of maximum flexure.
Claim 9
Dependent Claim
22 words
The invention of claim 5 wherein said torque indicator means further comprises means for visually reading-out the torque applied to said link.
Claim 10
Dependent Claim
30 words
The invention of claim 1 wherein said rotating means comprises a mandrel having a surface positioned closely adjacent to said fixture means to engage the surface of a test sample.
Claim 11
Dependent Claim
12 words
The invention of claim 7 wherein said mandrel is a hollow cylinder.
Claim 12
Dependent Claim
29 words
The invention of claim 7 wherein said mandrel is attached to a spindle rotatably mounted in said apparatus and power means for selectively rotating said spindle and said mandrel.
Claim 13
Dependent Claim
20 words
The invention of claim 9 further comprising means operatively associated with said mandrel for visually detecting the rotational speed thereof.
Claim 14
Dependent Claim
31 words
The invention of claim 1 wherein a test sample, constituting an annular friction disc, is mounted on said fixture means to have a tested surface thereof intersected by said pivot axis.
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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |