1. A turbomachine fan comprising:
blades carried by a rotor disk; and
inter-blade platforms having radial flanges fastened to corresponding radial flanges of the rotor disk by threaded rods inserted into positioning bushes mounted in orifices in the flanges of the inter-blade platforms,
wherein each bush comprises at least one deformable part interposed transversely between the threaded rod inserted into the bush and an edge of the orifice in which the bush is mounted, this deformable part being intended to allow the inter-blade platform to pivot in the event of an impact of a blade against the inter-blade platform and to absorb some of the energy of the impact, the deformable part of the bush being juxtaposed with a rigid part of the bush that is opposed to the deformable part with respect to the threaded rod.
2. The fan as claimed in claim 1, wherein the deformable part comprises two parallel half-cylinders which are connected by deformable webs and whose concavities are oriented in the same direction, one half-cylinder being applied to the threaded rod and the other to an internal cylindrical surface of the orifice in the radial flange of the inter-blade platform.
3. The fan as claimed in claim 2, wherein the ends of the two parallel half-cylinders are aligned with and substantially bear on cylindrical ends of the rigid part of the bush.
4. The fan as claimed in claim 3, wherein the aligned ends of one of the half-cylinders and of the rigid part have interengaged complementary indentations which immobilize the two parts of the bush with respect to one another against translational movement in the orifice in the radial flange of the inter-blade platform.
5. The fan as claimed in claim 2, wherein the parallel half-cylinders of the deformable part are connected by two substantially parallel webs joined to intermediate parts of the half-cylinders.
6. The fan as claimed in claim 3, wherein the deformable webs are substantially parallel to a plane tangent to a circumference of the rotor disk.
7. The fan as claimed in claim 1, wherein the radial flange of the inter-blade platform is fastened to the radial flange of the disk by two parallel threaded rods passing into two adjacent orifices in the radial flange of the disk and into a common orifice in the radial flange of the inter-blade platform in which there is mounted the bush comprising the rigid part and the deformable part, the rigid part being formed with an orifice for the passage of a first threaded rod and with a first half-orifice for the passage of a second threaded rod, the deformable part having a second half-orifice for the passage of the second threaded rod.
8. The fan as claimed in claim 1, wherein in the event of an impact of a blade against the inter-blade platform, the bush is displaced along a rectilinear path.
9. The fan as claimed in claim 1, wherein in the event of an impact of a blade against the inter-blade platform, the bush is displaced along a curved path.
10. The fan as claimed in claim 1, wherein the bush is fastened by crimping in the orifice the radial flange of the inter-blade platform.
11. A turbomachine which comprises a fan comprising:
blades carried by a rotor disk; and
inter-blade platforms having radial flanges fastened to corresponding radial flanges of the rotor disk by threaded rods inserted into positioning bushes mounted in orifices in the flanges of the inter-blade platforms,
wherein each bush comprises at least one deformable part interposed transversely between the threaded rod inserted into the bush and an edge of the orifice in which the bush is mounted, this deformable part being intended to allow the inter-blade platform to pivot in the event of an impact of a blade against the inter-blade platform and to absorb some of the energy of the impact, the deformable part of the bush being juxtaposed with a rigid part of the bush that is opposed to the deformable part with respect to the threaded rod.
12. A bush for fastening a flange of a platform, which comprises a rigid part and a deformable part, the deformable part having two parallel half-cylinders which are connected by deformable webs and whose concavities are oriented in the same direction, the two parallel half-cylinders having ends being aligned with and substantially bearing on cylindrical ends of the rigid part of the bush.
13. The bush as claimed in claim 12, wherein the aligned ends of one of the parallel half-cylinders and of the rigid part have interengaged complementary indentations.
14. The bush as claimed in claim 12, wherein the rigid part comprises an orifice and a half-orifice which are parallel, the half-orifice cooperating with a half-orifice of the deformable part.
15. The bush as claimed in claim 12, wherein the deformable part and the rigid part of the bush are juxtaposable.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A golf ball comprising a core, an intermediate layer and a cover, wherein the intermediate layer is comprised of a highly neutralized polymer has its specific gravity reduced to less than 1.05 and wherein the reduction in specific gravity of the intermediate layer is between 3% and 15% to minimize the reduction in the coefficient of restitution of the ball.
2. The golf ball of claim 1, wherein the core is comprised of a polybutadiene.
3. The golf ball of claim 1, wherein the reduction in specific gravity is caused by foaming.
4. The golf ball of claim 1, wherein the reduction in specific gravity is caused by expandable microspheres.
5. The golf ball of claim 1, wherein the highly neutralized thermoplastic polymer comprises a copolymer of ethylene and an \u03b1,\u03b2-unsaturated carboxylic acid or a terpolymer of ethylene, an \u03b1,\u03b2-unsaturated carboxylic acid, and an n-alkyl acrylate, the acid being at least 80% neutralized by a salt of an organic acid, a cation source, or a suitable base of the organic acid.
6. The golf ball of claim 5, wherein the highly neutralized polymer is fully neutralized by a salt of an organic acid, a cation source or a suitable base of the organic acid.
7. The golf ball of claim 1, wherein the highly neutralized polymer comprises a melt processible thermoplastic composition comprising (a) aliphatic, mono-functional organic acid(s) having fewer than 36 atoms and (b) an ethylene, C3-8 alpha, beta-ethylenically unsaturated carboxylic acid copolymer(s) and ionomer(s) thereof.
8. The golf ball of claim 1, wherein the highly neutralized polymer comprises (a) a salt of a high molecular weight organic acid and (b) an acid containing copolymer ionomer.
9. The golf ball of claim 8, wherein the highly neutralized polymer further comprises (c) a thermoplastic polymer selected from co-polyesteresters, copolyetheramides, block styrene polydiene thermoplastic elastomers, elastomeric polyolefins, and thermoplastic polyurethanes.
10. The golf ball of claim 1, wherein the diameter of the core and intermediate layer is from 1.45 inches to 1.66 inches.
11. The golf ball of claim 1, wherein the ball has a moment of inertia of greater than 85 g\xb7cm and the core has a reduced of specific gravity of at least 3%.
12. The golf ball of claim 1, wherein the ball has a moment of inertia of greater than 85 g\xb7cm and further comprises a thin dense layer having a specific gravity of greater than 2 surrounding the intermediate layer.
13. A golf ball comprising a sub-assembly of at least a core and an intermediate layer, wherein the subassembly has a diameter of at least 1.45 inches and the core has a diameter of 0.75 inch or less, wherein the specific gravity of the intermediate layer is reduced by 3% to 15% and the reduction in coefficient of restitution of the subassembly is less than 6%.
14. A golf ball comprising a sub-assembly of at least a core and an intermediate layer, wherein the subassembly has a diameter of at least 1.45 inches and the core has a diameter of 0.75 inch or less, wherein the wherein the specific gravity of the intermediate layer is reduced by 15% to 32% and the reduction in coefficient of restitution of the subassembly is less than 13%.
15. The golf ball of claim 14, wherein at least the intermediate layer is made from a highly neutralized polymer.
16. A golf ball comprising a subassembly of at least a core and an intermediate layer, wherein subassembly is encased in a cover, wherein the intermediate layer has its specific gravity reduced to less than 0.95 and the specific gravity of the subassembly is reduced by 2% to 5% and the reduction in coefficient of restitution of the subassembly is reduced less than 2%.
17. A golf ball comprising a subassembly of at least a core and an intermediate layer, wherein subassembly is encased in a cover, wherein the intermediate layer has its specific gravity reduced to less than 0.95 and wherein the specific gravity of the subassembly is reduced by 5% to 8% and the reduction in coefficient of restitution of the subassembly is less than 3%.
18. The golf ball of claim 17, wherein at least the intermediate layer of the golf ball is made from a highly neutralized polymer.
19. The golf ball of claim 18, wherein the core is made from the highly neutralized polymer.