US3818751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Testing apparatus for elastomers
Assignee: Uniroyal Goodrich Tire Co
•
Filing: 1972-05-23
•
Granted: 1974-06-25
•
Expires: 1992-05-23
Abstract
Abstract An apparatus for indicating, in numerical form, the stress produced in a sample of an elastomer when subjected to a deformation of predetermined magnitude, a numerical value of the length of time for the stress so produced to decrease to a predetermined percentage of the maximum, and also a numerical value of the area under the stress-time curve for a predetermined time interval inclusive of the maximum stress. The apparatus preferably includes means to bring the sample to a predetermined temperature prior to subjecting it to the predetermined deformation.
Inventors
- 👤 P Karper
- 👤 J Porter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:15
CPC Classifications
G; G01; G01N; G01N11/00; G01N11/10
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
111 words
An apparatus for determining a physical property of an elastomer comprising sample-engaging means including a pair of relatively movable members, means to move one of said members through a predetermined displacement relative to the other member while a sample of the elastomer to be tested is engaged between said members to thereby subject said sample to a predetermined strain, means to generate a continuing electrical signal representative of the induced stress of said sample resulting from said displacement and the relaxation of that stress, and electrical means responsive to said signal to digitally represent the integral of said signal for a predetermined time interval inclusive of the maximum of said stress.
Claim 2
Independent Claim
111 words
An apparatus for determining a physical property of an elastomer comprising sample-engaging means including a pair of relatively movable members, means to move one of said members through a predetermined displacement relative to the other member while a sample of the elastomer to be tested is engaged between said members to thereby subject said sample to a predetermined strain, means to generate a continuing electrical signal representative of the induced stress of said sample resulting from said displacement and the relaxation of that stress, and electrical means responsive to said signal to digitally represent the integral of said signal for a predetermined time interval inclusive of the maximum of said stress.
Claim 3
Dependent Claim
22 words
An apparatus as defined in claim 1 and further including a means to digitally indicate the maximum stress produced in said sample.
Claim 4
Dependent Claim
42 words
An apparatus as defined in claim 1 wherein said electrical means includes a digital voltmeter, an integrator circuit connected between said voltmeter and said means to generate the electrical signal and means to render said integrator circuit operative for a predetermined time.
Claim 5
Dependent Claim
39 words
An apparatus as defined in claim 1 and further including means responsive to said signal to digitally represent the lapse of time required for the stress produced in said sample to decrease a predetermined percentage of its maximum value.
Claim 6
Dependent Claim
53 words
An apparatus as defined in claim 4 wherein the last-named means includes an electrical operated counter, means to start said counter when the sample is strained, and means to automatically stop the counter when the stress remaining in said sample after the latter has decreased to a predetermined percentage of the maximum value.
Claim 7
Dependent Claim
58 words
An apparatus as defined in claim 1 wherein said means to generate an electrical signal comprises an electrical strain gauge responsive to the torsional force applied to the specimen, and the means responsive to said signal comprises electrical circuit means to store the maximum signal received from said strain gauge, and means to indicate the said maximum signal.
Claim 8
Dependent Claim
73 words
An apparatus as defined in claim 1 wherein said electrical means comprises a load cell which produces an electrical signal responsive to the displacement of said movable member, means to detect the maximum value of the signal received from said load cell, means to detect when the signal from the load cell has decreased to a predetermined percentage of its maximum, and electrical timing means for measuring the time required for said decrease.
Claim 9
Dependent Claim
21 words
An apparatus as defined in claim 1 and furTher comprising means to heat said sample engaging members to a selected temperature.
Claim 10
Dependent Claim
51 words
An apparatus as defined in claim 1 wherein said pair of relatively movable members are mounted in alignment, and means are provided to move one of said members toward and away from the other member to selectively engage the sample between members under predetermined pressure and to thereafter release the sample.
Claim 11
Independent Claim
95 words
An apparatus for determining a physical property of an elastomer comprising, sample-engaging means including a rotatable and nonrotatable member, means to move said rotatable member through a predetermined arc while a sample of the elastomer to be tested is engaged between said members to thereby subject said sample to a torsional stress, means to generate an electrical signal representative of the stress produced in said sample, and electrical means responsive to said signal to determine and digitally display the integral of said signal for a predetermined time interval inclusive of the maximum of said stress.
Claim 12
Independent Claim
95 words
An apparatus for determining a physical property of an elastomer comprising, sample-engaging means including a rotatable and nonrotatable member, means to move said rotatable member through a predetermined arc while a sample of the elastomer to be tested is engaged between said members to thereby subject said sample to a torsional stress, means to generate an electrical signal representative of the stress produced in said sample, and electrical means responsive to said signal to determine and digitally display the integral of said signal for a predetermined time interval inclusive of the maximum of said stress.
Claim 13
Dependent Claim
21 words
An apparatus as defined in claim 10 and further including means to digitally indicate the maximum stress produced in said sample.
Claim 14
Dependent Claim
42 words
An apparatus as defined in claim 10 wherein said electrical means further includes means responsive to said signal to digitally represent the lapse of time required for the stress produced in said sample to decrease a predetermined percentage of its maximum value.
Claim 15
Dependent Claim
58 words
An apparatus as defined in claim 12 wherein said electrical means includes an electrically operated counter, means to start said counter when the sample is initially subjected to the torsional stress, and means to automatically stop the counter when the stress remaining in said sample after the stressing has decreased to a predetermined percentage of the maximum value.
Claim 16
Dependent Claim
94 words
An apparatus as defined in claim 13 wherein the means to automatically stop the counter include means to detect the maximum stress produced in the sample, means responsive to said last-mentioned means providing a signal representative of a predetermimed percentage of said maximum stress, means comparing the last-mentioned signal with the signal representative of the stress remaining in said sample, and means to stop the counter when the signal representative of the stress remaining in the sample becomes less than the signal representative of a predetermined percentage of the maximum value of the stress.
Claim 17
Dependent Claim
21 words
An apparatus as defined in claim 14 and further comprising means to digitally indicate the maximum stress produced in the sample.
Claim 18
Dependent Claim
33 words
An apparatus as defined in claim 15 wherein the said maximum stress indicating means is a digital voltmeter operatively connected to the said means to detect the maximum stress produced in the sample.
Claim 19
Independent Claim
200 words
An apparatus for determining a physical property of an elastomer comprising: a frame including a base and vertically extending support members connected at the top; a specimen-engaging member rotatably mounted upon the frame adjacent the top thereof with its specimen-engaging surface facing downwardly, a second specimen-engaging member having a specimen-engaging surface facing upwardly; vertically movable means mounted on the base of said frame with the movable portion thereof non-rotatably supporting said second specimen-engaging member in axial alignment with the first-mentioned spacimen-engaging member, means to control movement of said vertically movable means to stop said movement when the adjacent surfaces of the specimen-engaging members are a predetermined distance from each other to thereby grip therebetween a specimen of predetermined dimensions under predetermined pressure; means to rapidly arcuately move the first-mentioned specimen-engaging member a preselected amount and thereby create a stress in the specimen; means to provide a continuous electrical signal of the stress produced in said specimen; means to detect the maximum of said signal; electrical means to integrate said continuous signal for a predetermined time intervaL inclusive of the maximum of said stress; and means to separately digitally indicate the said maximum of said signal and the time integral thereof.
Claim 20
Independent Claim
200 words
An apparatus for determining a physical property of an elastomer comprising: a frame including a base and vertically extending support members connected at the top; a specimen-engaging member rotatably mounted upon the frame adjacent the top thereof with its specimen-engaging surface facing downwardly, a second specimen-engaging member having a specimen-engaging surface facing upwardly; vertically movable means mounted on the base of said frame with the movable portion thereof non-rotatably supporting said second specimen-engaging member in axial alignment with the first-mentioned spacimen-engaging member, means to control movement of said vertically movable means to stop said movement when the adjacent surfaces of the specimen-engaging members are a predetermined distance from each other to thereby grip therebetween a specimen of predetermined dimensions under predetermined pressure; means to rapidly arcuately move the first-mentioned specimen-engaging member a preselected amount and thereby create a stress in the specimen; means to provide a continuous electrical signal of the stress produced in said specimen; means to detect the maximum of said signal; electrical means to integrate said continuous signal for a predetermined time intervaL inclusive of the maximum of said stress; and means to separately digitally indicate the said maximum of said signal and the time integral thereof.
Claim 21
Dependent Claim
94 words
An apparatus as defined in claim 17 further including means to provide an electrical signal which is a predetermined percentage of said maximum signal; electrical means comprising the last-mentioned signal with the continuing signal representative of the stress in said specimen; electrical counter means; means to initiate operation of said counter means when the specimen is initially subjected to stress; and means to stop the counter when the signal representative of the stress remaining in the sample become less than the signal representative of a predetermined percentage of the maximum value of the stress.
Claim 22
Dependent Claim
29 words
An apparatus as defined in claim 18 wherein said specimen-engaging members are each electrically heated and means are provided to individually control the temperature of each of said member.
Claim 23
Dependent Claim
35 words
An apparatus as defined in claim 18 wherein one of said specimen-engaging members has a conically shaped cavity therein and the other of said members has a conically shaped projection axially aligned with said cavity.
References Cited (Backward Citations)
US3675475A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |