US4011929A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dampening device using a silicone rubber
Assignee: General Electric Co
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Filing: 1975-05-02
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Granted: 1977-03-15
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Expires: 1995-05-02
Abstract
Abstract There is provided a new improved dampening medium for a shock dampening device. The dampening device comprises a closed chamber, a movable piston rod extending through the chamber and an enlarged piston head located on the piston rod. Located in the interior space of the closed chamber under pressure is a compressible solid, fragmented, particulate mass of cured unfilled silicone rubber composition for producing a damping effect on the piston rod and head. The damper device includes a threaded plug for varying the internal static pressure on the compressible mass within the chamber and apertures extending through the piston head or an annular space between the outer edge of the piston head and the interior of the chamber for bypassing the compressible mass.
Inventors
- 👤 Edward M. Jeram
- 👤 Richard A. Striker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:12
CPC Classifications
F; F16; F16F; F16F7/00; F16F7/01
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
154 words
In a damper comprising a closed chamber, a movable piston rod extending through said chamber, an enlarged piston head on said rod, a compressible solid mass under pressure and located within said chamber for producing a damping force on said rod and piston head, a bypass means associated with said piston head providing for transfer of said compressible solid mass therethrough, and a means for varying the pressure of the compressible solid mass in said chamber within a pressure range required to produce damping on said rod, the improvement which comprises utilizing as said solid, an unfilled silicone rubber composition produced by curing a composition comprising 0.1-2.0 parts of peroxide catalyst to 100 parts of a polymer composition consisting of 95-99.5 mole % of dimethyl siloxane units, 0.05-2.0 mole % of methyl vinyl siloxane units, 0.001-5.0 mole % of trimethyl siloxane units, and said silicone rubber composition being fragmentable into particulate form after curing.
Claim 2
Dependent Claim
154 words
In a damper comprising a closed chamber, a movable piston rod extending through said chamber, an enlarged piston head on said rod, a compressible solid mass under pressure and located within said chamber for producing a damping force on said rod and piston head, a bypass means associated with said piston head providing for transfer of said compressible solid mass therethrough, and a means for varying the pressure of the compressible solid mass in said chamber within a pressure range required to produce damping on said rod, the improvement which comprises utilizing as said solid, an unfilled silicone rubber composition produced by curing a composition comprising 0.1-2.0 parts of peroxide catalyst to 100 parts of a polymer composition consisting of 95-99.5 mole % of dimethyl siloxane units, 0.05-2.0 mole % of methyl vinyl siloxane units, 0.001-5.0 mole % of trimethyl siloxane units, and said silicone rubber composition being fragmentable into particulate form after curing.
Claim 3
Dependent Claim
22 words
A damper as defined in claim 1 wherein said bypass means consists of one or more apertures extending through said piston head.
Claim 4
Dependent Claim
74 words
A damper as defined in claim 1 wherein said bypass means consists of a space between the interior surface of said chamber and the outer edge of said piston head defining an annulus, said chamber having a cross section of varying diameter so that the space between the interior of said chamber and the outer edge of said piston defines an annulus of variable area for the movement therethrough of said compressible solid mass.
Claim 5
Dependent Claim
14 words
A damper as defined in claim 1 adapted for use as a shock absorber.
Claim 6
Dependent Claim
19 words
A damper as defined in claim 1 adapted for use as a shock absorber in an automotive safety bumper.
Claim 7
Dependent Claim
28 words
A shock absorber as defined in claim 5 wherein said polymer composition, before curing, has a viscosity in the range between 5,000 and 30,000 cps. at 25° C.
Claim 8
Dependent Claim
27 words
A shock absorber as defined in claim 6 wherein said polymer composition, before curing, has a viscosity of about 10,000 to about 20,000 cps. at 25° C.
Claim 9
Dependent Claim
37 words
A shock absorber as defined in claim 6 wherein said silicone rubber composition has been cured by heating, in situ, for about 15 to 90 minutes at a temperature of from about 300° to about 450° F.
Claim 10
Dependent Claim
19 words
A damper as defined in claim 1 wherein said silicone rubber composition has been cured and fragmented in situ.
Claim 11
Dependent Claim
18 words
A damper as defined in claim 1 wherein said peroxide comprises 2,5 dimethyl -2,5- di (t-butyl peroxy) hexane.
Claim 12
Dependent Claim
31 words
A damper as defined in claim 10 wherein said silicone rubber composition has been cured for 15 to 90 minutes at a temperature of from 300° to 450° F., before fragmentation.
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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) | 1980-03-14 | 1980-09-13 | 1981-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-14 | 1984-09-13 | 1985-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-14 | 1988-09-13 | 1989-03-15 | $7700.00 | Window Closed / Lapsed |