US3736805A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toothed belts
Assignee: Dunlop Holdings Ltd
•
Filing: 1971-04-27
•
Granted: 1973-06-05
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Expires: 1991-04-27
Abstract
Abstract A toothed belt comprising a continuous strip of elastomeric material having embedded therein at least one wire reinforcing cord comprising at least one bunch of fine gauge metal filaments, of which the following is a specification.
Inventors
- 👤 M Dent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:13
CPC Classifications
B; B29; B29D; B29D29/00; B29D29/08; F; F16; F16G; F16G1/00; F16G1/28
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
26 words
A toothed belt according to claim 1 wherein the metal filaments have a diameter in the range 0.0005 of an inch to 0.002 of an inch.
Claim 2
Dependent Claim
28 words
A toothed belt according to claim 1 wherein the wire cord comprises two or more strands, each strand being formed from a bunch of fine gauge metal filaments.
Claim 3
Dependent Claim
23 words
A toothed belt according to claim 1 wherein a strand of the wire cord comprises a twisted bunch of fine gauge metal filaments.
Claim 4
Dependent Claim
23 words
A toothed belt according to claim 3 wherein a strand of the wire cord comprises an untwisted bunch of fine gauge metal filaments.
Claim 5
Dependent Claim
15 words
A toothed belt according to claim 1 wherein the wire cord is a doubled cord.
Claim 6
Dependent Claim
15 words
A toothed belt according to claim 6 wherein the wire cord contains only two strands.
Claim 7
Dependent Claim
32 words
A toothed belt according to claim 1 wherein the wire cord comprises a number of strands of fine gauge metal filaments, the strands being laid around each other or around a core.
Claim 8
Dependent Claim
18 words
A toothed belt according to claim 1 in which the fine gauge metal filaments are of circular cross-section.
Claim 9
Dependent Claim
18 words
A toothed belt according to claim 1 in which the fine gauge metal filaments are of non-circular cross-section.
Claim 10
Dependent Claim
17 words
A toothed belt according to claim 1 in which the fine gauge metal filaments are steel filaments.
Claim 11
Dependent Claim
18 words
A toothed belt according to claim 11 in which the wire cord is a brass plated steel cord.
Claim 12
Independent Claim
123 words
A method for the production of a toothed belt comprising passing a sheet of unvulcanized elastomeric material and a sheet of stretchable fabric through the nip of a pair of rollers, one of which is a forming roll formed with a series of circumferentially extending grooves having the required belt tooth profile, the other roll being a pressure roll, applying the composite sheet thus formed to a mould having a toothed profile complementary to that of the profiled composite sheet, winding around the radially outer surface of the composite sheet at least one tension layer of wire cord comprising a bunch of fine gauge metal filaments, applying a covering layer of elastomeric material over the tension layer, and moulding and vulcanizing the assembly.
Claim 13
Dependent Claim
28 words
a method according to claim 13 wherein the fine gauge metal filaments each have a diameter in the range 0.0005 of an inch to 0.003 of an inch.
Claim 14
Dependent Claim
28 words
A method according to claim 13 wherein the fine gauge metal filaments each have a diameter in the range 0.0005 of an inch to 0.002 of an inch.
Claim 15
Dependent Claim
32 words
A method according to claim 13 including the step of winding at least one spiral layer of wire cord around the radially outer surface of the composite sheet, as a tension layer.
Claim 16
Dependent Claim
34 words
A method according to claim 13 wherein the tension layer of wire cord is applied in sections across the width of the mould, each section being of the appropriate width to form a belt.
Claim 17
Dependent Claim
41 words
A method according to claim 17 wherein the adjacent sections are separated by a narrow space traversed by the cord at a wider pitch than the pitch of the cord in the sections, to leave an unreinforced gap between the sections.
Claim 18
Dependent Claim
18 words
A method according to claim 17 wherein the wire cord in the sections is applied at touch pitch.
Claim 19
Dependent Claim
18 words
A method according to claim 13 applied to the manufacture of a toothed belt according to claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |