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EP0288986A2
Expired / Lapsed
EP
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Improvements in the beads of pneumatic tires for vehicle wheels
Assignee: Pirelli and C SpA
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Filing: 1988-04-27
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Granted: —
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Expires: 2008-04-27
Abstract
Abstract The metal core used for reinforcing tire beads is constituted by a plurality of coils of wire (16), (17), (18), axially arranged side-by-side and radially superimposed, in which the wire has a straight section of modular shape with two equal and parallel opposite sides (1), (2), the profiles (15) connecting the corresponding ends of the opposite sides having a distance, from the axis of said pair of sides, whose value varies from one side to the other, said variation comprising at least one inversion of value along the development of the profile.
Inventors
- 👤 Luigi Maiocchi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 19:03
CPC Classifications
B; B60; B60C; B60C15/00; B60C15/04; D; D07; D07B; D07B1/00; D07B1/06; D07B1/0606; D07B1/062; D07B2201/00; D07B2201/20; D07B2201/2001; D07B2201/2002; D07B2201/2015; D07B2201/2033; D07B2501/00; D07B2501/20; D07B2501/2046; D07B2501/2053
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
136 words
Circumferentially inextensible annular metal core for reinforcing the beads of pneumatic tires for vehicle wheels, said core comprising a package of coils (10)-(14) of wire, radially superimposed and axially arranged side-by-side with respect to one another, and a plurality of check elements (20), situated along the peripheral development of said reinforcing core, each of which is closed as a ring around the package of coils, the core being characterized in that the metal wire forming the coils has a straight section comprising two rectilinear and parallel opposite sides (1),(2), the corresponding ends of said sides being connected by a profile (3) having a distance which is variable with respect to a pre-established straight line "r" perpendicular to said pair of sides, said variation comprising at least one inversion of value along the development of the profile.
Claim 2
Dependent Claim
136 words
Circumferentially inextensible annular metal core for reinforcing the beads of pneumatic tires for vehicle wheels, said core comprising a package of coils (10)-(14) of wire, radially superimposed and axially arranged side-by-side with respect to one another, and a plurality of check elements (20), situated along the peripheral development of said reinforcing core, each of which is closed as a ring around the package of coils, the core being characterized in that the metal wire forming the coils has a straight section comprising two rectilinear and parallel opposite sides (1),(2), the corresponding ends of said sides being connected by a profile (3) having a distance which is variable with respect to a pre-established straight line "r" perpendicular to said pair of sides, said variation comprising at least one inversion of value along the development of the profile.
Claim 3
Dependent Claim
31 words
Reinforcing core as in CLAIM 1, characterized in that said profile (4) is specularly symmetrical with respect to a straight line "m" parallel to said opposite sides and equally spaced therefrom.
Claim 4
Dependent Claim
17 words
Reinforcing core as in CLAIM 2, characterized in that the straight section of said wire is modular.
Claim 5
Dependent Claim
18 words
Reinforcing core as in CLAIM 3, characterized in that said profile (4) is a substantially sinusoidal curvilinear profile.
Claim 6
Dependent Claim
21 words
Reinforcing core as in CLAIM 3, characterized in that said profile is constituted by a broken line (15) of two sides.
Claim 7
Dependent Claim
48 words
Reinforcing core as in CLAIM 3, characterized in that the distance of said profile from the axis of said pair of opposite and parallel sides varies from a minimum to a maximum value and then again to a minimum value by passing from one side to the other.
Claim 8
Dependent Claim
35 words
Reinforcing core as in CLAIM 3, characterized in that the radially inner free edges of the radially innermost coils arranged side-by-side lie on a line (s) inclined by 15° with respect to the core axis.
Claim 9
Dependent Claim
22 words
Reinforcing core as in CLAIM 1, characterized in that the radially superimposed coils are constituted by a strap wound up on itself.
Claim 10
Dependent Claim
47 words
Reinforcing core as in CLAIM 1, characterized in that the package of coils arranged side-by-side is provided along its circumferential development, at least at two diametrically opposite points, with a check element (20) resistant at least to tension, wound up around said package of coils arranged side-by-side.
Claim 11
Dependent Claim
43 words
Pneumatic tire for vehicle wheels, comprising a toroidal carcass provided with beads for anchorage to a corresponding assembly rim, characterized in that it comprises, for each bead, at least a circumferentially inextensible annular reinforcing core C, as in any of the preceding claims.
References Cited (Backward Citations)
No citation records indexed.
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