Patent US5724477A successfully refreshed from Google Patents.
Patent US3823833A successfully refreshed from Google Patents.
US3823833A
Expired / Lapsed
US
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Polyureaurethane shock absorbing unit
Assignee: Goodyear Tire and Rubber Co
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Filing: 1973-08-08
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Granted: 1974-07-16
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Expires: 1993-08-08
Abstract
Abstract A polyureaurethane shock absorbing unit prepared from an adjusted and balanced mixture of specific diamines, diisocyanates and a manipulative determined molecular weight balance of predetermined polyether polyols and polyester polyols. The unique shock absorbing unit is characterized by withstanding at least 300 cycles of a cyclic shock endurance test when of the prescribed configuration.
Inventors
- 👤 D Chung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:44
CPC Classifications
F; F16; F16F; F16F1/00; F16F1/36; F16F1/3605; C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/12; C08G18/28; C08G18/40; C08G18/4009; C08G18/4018
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
195 words
The shock absorbing unit of claim 1 characterized by withstanding compressive cycling for at least about 300 cycles under constant compression, a cycle comprising alternating between a maximum of about 45 to about 55 percent and a minimum of about 8 to about 12 percent of its original uncompressed height over a period of about 30 seconds for a complete cycle followed by about 4.5 minute pause between cycles, and further characterized by deflecting from about 0.3 to about 0.6 inch at about 25*C. upon the application of about 1,800 pounds per square inch uniformly to the end surface areas (force-receiving surfaces) of the said shaped resilient composition when the said composition is a generally disc-shaped cylindrical element with circular parallel end surfaces, said surfaces covered and adhered to circular steel plates, having a diameter of about 6.5 inches, a height of about 1.5 inches and a sidewall connecting the end surfaces substantially in the form of a V-shaped groove having substantially equal length sides, the said groove extending between the said end surfaces, the volume of the solid portion of the said element being about 150 percent of the volume of the said groove.
Claim 2
Dependent Claim
73 words
The shock absorbing unit of claim 2, where said polyureaurethane is characterized by a -40*C. cold temperature compression test where the said polyureaurethane, at -40*C., when shaped and cured to a solid circular disc with a straight side-wall, having a diameter of about 1.13 inch and a thickness of about 0.5 inch, requires a maximum pressure of 7,500 pounds per square inch applied to its flat surfaces to compress the disc 40 percent.
Claim 3
Dependent Claim
140 words
The shock absorbing unit of claim 2 where said diamine is 2, 2''-diaminodiphenyldisulfide, where said polyether polyol-polyester polyol mixture has a total average molecular weight in the range of about 1,400 to about 1,800 and the polyester polyols are selected from at least one of (a) caprolactone polyesters prepared from epsilon -caprolactone and diethylene glycol, (b) adipates of adipic acid and glycols selected from 1,4-butane diol and 1,6-hexane Diol and (c) azelates of azelaic acid and glycols selected from 1,4-butane diol and 1,6-hexane diol, where the ratio of isocyanato groups of the diisocyanate to the sum of the said hydroxyl groups of the polyols is from about 1.7 to about 2.0, where the ratio of primary amino groups to excess isocyanato groups over the sum of the said hydroxyl groups of the polyols is from about 0.7 to about 0.95.
Claim 4
Dependent Claim
15 words
The shock absorbing unit of claim 4 where the polyether polyol is polytetramethylene ether glycol.
Claim 5
Dependent Claim
12 words
The shock absorbing unit of claim 4 where the diisocyanate is 3,3''-dimethyldiphenylenemethane-4,4''-diisocyanate.
Claim 6
Dependent Claim
47 words
The shock absorbing unit of claim 1 suitable for use in a railroad draft gear comprising said shaped solid resilient polyureaurethane composition having two opposing and substantially parallel force-receiving surfaces connected by at least one side-wall and having rigid force-receiving metal plates adhered to its force-receiving surfaces.
Claim 7
Dependent Claim
91 words
The shock absorbing unit of claim 7 having a generally disc-shaped cylindrical element with circular parallel end surfaces having diameters of about 6.5 inches, a height of about 1.5 inch, and a side-wall connecting the end surfaces substantially in the form of a V-shaped groove having substantially equal length sides, the said groove extending between the said end surfaces, the volume of the solid portion of the said element being about 150 percent of the volume of the said groove, and where the said adherent rigid force-receiving plates are steel plates.
Claim 8
Dependent Claim
195 words
The shock absorbing unit of claim 8 characterized by withstanding compressive cycling for at least about 500 cycles under constant compression, a cycle comprising alternating between a maximum of about 45 to about 55 percent and a minimum of about 8 to about 12 percent of its original uncompressed height over a period of about 30 seconds for a complete cycle followed by about 4.5 minute pause between cycles, and further characterized by deflecting from about 0.3 to about 0.6 inch at about 25*C. upon the application of about 1,800 pounds per square inch uniformly to the end surface areas (force-receiving surfaces) of the said shaped resilient composition when the said composition is a generally disc-shaped cylindrical element with circular parallel end surfaces, said surfaces covered and adhered to circular steel plates, having a diameter of about 6.5 inches, a height of about 1.5 inches and a sidewall connecting the end surfaces substantially in the form of a V-shaped groove having substantially equal length sides, the said groove extending between the said end surfaces, the volume of the solid portion of the said element being about 150 percent of the volume of the said groove.
Claim 9
Dependent Claim
140 words
The shock absorbing unit of claim 9 where said diamine is 2, 2''-diaminodiphenyldisulfide, where said polyether polyol-polyester polyol mixture has a total average molecular weight in the range of about 1,400 to about 1,800 and the polyester polyols are selected from at least one of (a) caprolactone polyesters prepared from epsilon -caprolactone and diethylene glycol, (b) adipates of adipic acid and glycols selected from 1,4-butane diol and 1,6-hexane diol and (c) azelates of azelaic acid and glycols selected from 1,4-butane diol and 1,6-hexane diol, where the ratio of isocyanato groups of the diisocyante to the sum of the said hydroxyl groups of the polyols is from about 1.7 to about 2.0, where the ratio of primary amino groups to excess isocyanato groups over the sum of the said hydroxyl groups of the polyols is from about 0.7 to about 0.95.
Claim 10
Dependent Claim
30 words
A method of preparing the shock absorbing unit of claim 7 which comprises reacting the polyureaurethane reactants in a mold having the required configuration and having metal-force-receiving plates inserted therein.
Claim 11
Dependent Claim
34 words
A series oF about 8 to about 12 of the shock absorbing units of claim 7 loaded in a cylinder in series to a shock load with their rigid force-receiving plates facing each other.
References Cited (Backward Citations)
US3370718A
Cited
US3741406A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |