Fasteners made of composite material of a ceramic matrix reinforced with refractory fibers
First Claim
Patent Images
1. Threaded fasteners, comprising:
- at least one first element comprising at least one male portion, said at least one first element being composed of a composite material comprising a refractory fiber reinforced ceramic matrix;
at least one second element comprising at least one female portion, said at least one second element being composed of a composite material comprising a refractory fiber reinforced ceramic matrix; and
each of said at least one male portion and said at least one female portion including a threaded portion comprising round threads, and said threaded portion of said at least one male portion and said threaded portion of said at least one female portion comprise substantially the same profile within machining tolerance and functional clearance.
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Accused Products
Abstract
Fasteners composed of a composite material constituted by a ceramic matrix reinforced with refractory fibers for use in the assembling and dissembling of structures likely to be subjected to high temperatures. The fasteners, which can comprise screws, nuts and bolts, can include a threaded rod, possibly comprising a head, and at least one nut cooperating with the rod. The threads of the rod and the nut are round threads. Further, the male and female portions of the threads have the same theoretical profile to within machining tolerance and functional clearance.
26 Citations
19 Claims
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1. Threaded fasteners, comprising:
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at least one first element comprising at least one male portion, said at least one first element being composed of a composite material comprising a refractory fiber reinforced ceramic matrix; at least one second element comprising at least one female portion, said at least one second element being composed of a composite material comprising a refractory fiber reinforced ceramic matrix; and each of said at least one male portion and said at least one female portion including a threaded portion comprising round threads, and said threaded portion of said at least one male portion and said threaded portion of said at least one female portion comprise substantially the same profile within machining tolerance and functional clearance. - View Dependent Claims (9, 10)
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2. Threaded fasteners, comprising:
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at least one first element comprising at least one male portion, said at least one first element being composed of a composite material comprising a refractory fiber reinforced ceramic matrix; at least one second element comprising at least one female portion, said at least one second element being composed of a composite material comprising a refractory fiber reinforced ceramic matrix; and each of said at least one male portion and said at least one female portion including a threaded portion comprising round threads, and said threaded portion of said at least one male portion and said threaded portion of said at least one female portion comprise substantially the same profile within machining tolerance and functional clearance; and said round threads have a root radius and a crest radius, and said at least one male portion has an external diameter; and
space="preserve" listing-type="equation">0.03≦
r/D≦
0.07wherein r represents the radius of the root of said round thread or the radius of the crest of said round thread, and D represents the external diameter. - View Dependent Claims (3, 6)
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4. Threaded fasteners, comprising:
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at least one first element comprising at least one male portion, said at least one first element being composed of a composite material comprising a refractory fiber reinforced ceramic matrix; at least one second element comprising at least one female portion, said at least one second element being composed of a composite material comprising a refractory fiber reinforced ceramic matrix; and each of said at least one male portion and said at least one female portion including a threaded portion comprising round threads, and said threaded portion of said at least one male portion and said threaded portion of said at least one female portion comprise substantially the same profile within machining tolerance and functional clearance; and
wherein;
space="preserve" listing-type="equation">30°
≦
α
≦
100°wherein α
represents an angle determined by tangent lines to points of intersection of flanks of said round threads and straight lines joining centers of curvature of the round threads of said at least one male portion and said at least one female portion. - View Dependent Claims (5)
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7. Threaded fasteners, comprising:
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at least one first element comprising at least one male portion, said at least one first element being composed of a composite material comprising a refractory fiber reinforced ceramic matrix; at least one second element comprising at least one female portion, said at least one second element being composed of a composite material comprising a refractory fiber reinforced ceramic matrix; and each of said at least one male portion and said at least one female portion including a threaded portion comprising round threads, and said threaded portion of said at least one male portion and said threaded portion of said at least one female portion comprise substantially the same profile within machining tolerance and functional clearance; and said at least one second element comprises at least one nut comprising a spherical bearing surface. - View Dependent Claims (8)
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11. Threaded fasteners, comprising:
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at least one first element comprising at least one male portion, said at least one first element being composed of a composite material comprising a refractory fiber reinforced ceramic matrix; at least one second element comprising at least one female portion, said at least one second element being composed of a composite material comprising a refractory fiber reinforced ceramic matrix; and each of said at least one male portion and said at least one female portion including a threaded portion comprising round threads, and said threaded portion of said at least one male portion and said threaded portion of said at least one female portion comprise substantially the same profile within machining tolerance and functional clearance; said at least one first element comprises a threaded rod; and said at least one second element comprises at least one nut comprising a spherical bearing surface. - View Dependent Claims (12, 13, 14, 15)
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16. Threaded fasteners, comprising:
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at least one first element comprising at least one male portion, said at least one first element being composed of a composite material comprising a refractory fiber reinforced ceramic matrix;
.at least one second element comprising at least one female portion, said at least one second element being composed of a composite material comprising a refractory fiber reinforced ceramic matrix; and each of said at least one male portion and said at least one female portion including a threaded portion comprising round threads, and said threaded portion of said at least one male portion and said threaded portion of said at least one female portion comprise substantially the same profile within machining tolerance and functional clearance; said at least one first element comprises a threaded rod comprising a head; and said threaded rod comprises a screw, and said head comprises a barrel side including a spherical bearing surface. - View Dependent Claims (17)
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18. Threaded fasteners, comprising:
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at least one first element comprising at least one male portion, said at least one first element being composed of a composite material comprising a refractory fiber reinforced ceramic matrix; at least one second element comprising at least one female portion, said at least one second element being composed of a composite material comprising a refractory fiber reinforced ceramic matrix; and each of said at least one male portion and said at least one female portion including a threaded portion comprising round threads, and said threaded portion of said at least one male portion and said threaded portion of said at least one female portion comprise substantially the same profile within machining tolerance and functional clearance; said at least one first element comprises a threaded rod comprising a head; and said spherical bearing surface of said head is capable of cooperating with a spherical bearing surface in a surface of an element to be assembled.
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19. Threaded fasteners, comprising:
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at least one first element comprising at least one male portion, said at least one first element being composed of a composite material comprising a refractory fiber reinforced ceramic matrix; at least one second element comprising at least one female portion, said at least one second element being composed of a composite material comprising a refractory fiber reinforced ceramic matrix; and each of said at least one male portion and said at least one female portion including a threaded portion comprising round threads, and said threaded portion of said at least one male portion and said threaded portion of said at least one female portion comprise substantially the same profile within machining tolerance and functional clearance; and said composite material comprises at least one ceramic matrix selected from the group consisting of SiAlON or SiAlYON and Si3 N4 reinforced with at least one member selected from the group consisting of silicon carbide and silicon nitride trichites.
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Specification