US3847018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for testing the deformation under load of rubber or other elastically deformable materials
Assignee: ZF International UK Ltd
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Filing: 1973-07-10
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Granted: 1974-11-12
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Expires: 1993-07-10
Abstract
Abstract An apparatus for testing the deformation under load of elastic materials has a base and a pressure plate between which a specimen may be clamped. An initial deformation is applied to the specimen by a screw which coacts with the pressure plate. The screw also provides one of a pair of electrical contacts, the other contact moving with the pressure plate. An external load applied to the pressure plate to further deform the specimen breaks an electrical circuit to provide a reading of this further load. Provision is made for releasing the load applied by the screw and for resetting the screw so as to apply the same initial load.
Inventors
- 👤 M Aston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:45
CPC Classifications
G; G01; G01N; G01N3/00; G01N3/08; G01N3/14; G01N2203/00; G01N2203/003; G01N2203/0032; G01N2203/0035
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
189 words
Apparatus for testing the deformation under load of rubber or other elastically deformable materials, comprising, in combination, a base for supporting the specimen, a pressure plate arranged to bear against the specimen supported on the base, an electrically conductive contact piece upstanding from the centre of the pressure plate, a clamping plate connected to the base, screw means whereby a load is, in use, applied from the clamping plate through the contact piece and pressure plate to a specimen on the base, load applying means arranged to bear on the pressure plate, and load measuring apparatus connected to said load applying means, the said screw means comprising a bush which is axially adjustable with respect to said clamping plate and a plug threadedly engaged within the bush, the said plug having an abutment which is engageable with the sleeve to locate the plug axially with respect to the bush, the arrangement being such that when the load applied by said load applying means exceeds the load applied from the clamping plate, the contact piece will be removed from contact with the clamping plate to break an electric connection therewith.
Claim 2
Dependent Claim
189 words
Apparatus for testing the deformation under load of rubber or other elastically deformable materials, comprising, in combination, a base for supporting the specimen, a pressure plate arranged to bear against the specimen supported on the base, an electrically conductive contact piece upstanding from the centre of the pressure plate, a clamping plate connected to the base, screw means whereby a load is, in use, applied from the clamping plate through the contact piece and pressure plate to a specimen on the base, load applying means arranged to bear on the pressure plate, and load measuring apparatus connected to said load applying means, the said screw means comprising a bush which is axially adjustable with respect to said clamping plate and a plug threadedly engaged within the bush, the said plug having an abutment which is engageable with the sleeve to locate the plug axially with respect to the bush, the arrangement being such that when the load applied by said load applying means exceeds the load applied from the clamping plate, the contact piece will be removed from contact with the clamping plate to break an electric connection therewith.
Claim 3
Dependent Claim
38 words
An apparatus as claimed in claim 1 in whiCh the bush is threadedly engaged with the clamping plate and which includes locking means to secure the bush in a predetermined axial position with respect to the clamping plate.
Claim 4
Dependent Claim
26 words
An apparatus as claimed in claim 1 which includes, between the base and the pressure plate, means for supporting and locating the periphery of the specimen.
Claim 5
Dependent Claim
32 words
An apparatus as claimed in claim 1 which includes, between the base and the pressure plate, a plug which lies, in use, within a bore in the specimen to locate the latter.
Claim 6
Dependent Claim
23 words
An apparatus as claimed in claim 4 in which the said plug includes a passage which communicates with a passage within the base.
Claim 7
Dependent Claim
30 words
An apparatus as claimed in claim 1 in which at least that portion of the base against which the specimen, in use, bears being formed of an electrically insulating material.
Claim 8
Dependent Claim
16 words
An apparatus as claimed in claim 6 in which the said insulating portion comprises a coating.
Claim 9
Dependent Claim
21 words
An apparatus as claimed in claim 7 in which the coating is in the form of an insert in the base.
Claim 10
Dependent Claim
31 words
An apparatus as claimed in claim 1 in which at least that portion of the pressure plate against which the specimen, in use, bears being formed of an electrically insulating material.
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) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |