US3724614A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compression fastener
Assignee: Bendix Corp
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Filing: 1971-06-09
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Granted: 1973-04-03
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Expires: 1991-06-09
Abstract
Abstract Fastening means including a circular insert adapted to fit into a mating opening of a segment of brittle material and fixedly secure same to a relatively stiff backing member. The insert has a sleeve portion and integral head and shoulder portions. The head portion is funnel shaped with its inner included angle greater than its outer included angle. A plurality of radially extending slots in the head portion permit radially outward flexing thereof. The outer included angle of the head portion is greater than the included angle of the mating opening and contact therebetween is established substantially simultaneously with engagement of the shoulder portion with the backing member. A rivet or similar fastening member extending through the insert exerts an axially directed force thereon causing the head portion to flex thereby progressively increasing the contact area between the head portion and adjacent wall of the mating opening to draw the segment into contact with the backing member with a minimum of bending force.
Inventors
- 👤 J Bender
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:39
CPC Classifications
F; F16; F16D; F16D69/00; F16D69/04; F16D69/0408; F16B; F16B5/00; F16B5/04; F16D2069/0425; F16D2069/0433
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
167 words
A fastened assembly including fastener means securing brittle material to a relatively stiff backing member comprising in combination: brittle material having a conical countersunk opening therein; a stiff backing member having an opening therein having a diameter smaller than the minor diameter of said countersunk opening to define a shoulder portion on said backing member; an annular insert having a countersunk head portion including means rendering said head radially flexible, said head portion seated upon the wall of said countersunk opening, a sleeve portion mated with said opening in said backing member, and a radially extending shoulder separating said head and sleeve portions and bearing against said shoulder portion; and a fastening member extending through said insert and having a conical end portion engaging said countersunk head portion whereby said material is drawn into engagement with said backing member; said head portion being flexed radially outwardly by said fastening member and progressively imposing a compressive force along the wall of said countersunk opening in said brittle material.
Claim 2
Dependent Claim
167 words
A fastened assembly including fastener means securing brittle material to a relatively stiff backing member comprising in combination: brittle material having a conical countersunk opening therein; a stiff backing member having an opening therein having a diameter smaller than the minor diameter of said countersunk opening to define a shoulder portion on said backing member; an annular insert having a countersunk head portion including means rendering said head radially flexible, said head portion seated upon the wall of said countersunk opening, a sleeve portion mated with said opening in said backing member, and a radially extending shoulder separating said head and sleeve portions and bearing against said shoulder portion; and a fastening member extending through said insert and having a conical end portion engaging said countersunk head portion whereby said material is drawn into engagement with said backing member; said head portion being flexed radially outwardly by said fastening member and progressively imposing a compressive force along the wall of said countersunk opening in said brittle material.
Claim 3
Dependent Claim
64 words
A fastened assembly, as claimed in claim 1, wherein: said head portion is provided with a conical outer wall having an included angle initially greater than the included angle of said countersunk opening; said head portion having a plurality of radially extending slots formed therein to permit radially outward flexing of said head portion in response to force imposed thereon by said fastening member.
Claim 4
Dependent Claim
33 words
A fastened assembly, as claimed in claim 2, wherein: said radially extending shoulder engages said shoulder portion on said backing member simultaneously with engagement of said conical outer wall and said countersunk opening.
Claim 5
Dependent Claim
25 words
A fastened assembly, as claimed in claim 1, wherein: said countersunk head portion has a conical opening receiving said end portion of said fastening member.
Claim 6
Dependent Claim
36 words
A fastened assembly, as claimed in claim 1, wherein: said countersunk head portion has conical inner and outer walls; said inner wall having an included angle initially greater than the included angle of said outer wall.
Claim 7
Dependent Claim
78 words
A fastened assembly, as claimed in claim 1, wherein the backing member and brittle material define an annular brake disc and flat friction segment, respectively, and wherein: said friction segment is secured to one side of said annular brake disc; said fastening member is a rivet extending through said insert and a backing washer engaging the opposite side of said annular brake disc; said rivet having opposite end portions bearing against said head portion and said backing washer.
Claim 8
Dependent Claim
71 words
A fastened assembly, as claimed in claim 1, wherein the backing member and brittle material define an annular brake disc and flat friction segments, respectively, and wherein: said friction segments are secured to opposite sides of said annular brake disc; said fastening member is a rivet extending through said friction segments and having opposite end portions each of which bear against said head portion of an associated one of said inserts.
References Cited (Backward Citations)
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Cited
US1232274A
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US2525117A
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |