US3939890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wide base type pneumatic tire for construction vehicle
Assignee: Bridgestone Corp
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Filing: 1975-04-21
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Granted: 1976-02-24
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Expires: 1995-04-21
Abstract
Abstract A wide base type pneumatic tire for construction vehicle has a given sectional thickness distribution of crown portion, a tread pattern of lug arrangement and a crown radius of at least 75% of overall tire width, and is usable for dump truck, earth mover and the like.
Inventors
- 👤 Masaru Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:05
CPC Classifications
B; B60; B60C; B60C11/00; B60C11/03; B60C11/0311; B60C2200/00; B60C2200/06; B60C2200/065; Y; Y10; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495; Y10T152/10855
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
147 words
A wide base type pneumatic tire for construction vehicle comprising a crown portion and a shoulder, said tire having such a sectional thickness distribution that a thickness at a middle point between crown center and shoulder is 0.95-1.08 times and a thickness at said shoulder is 1.00-1.30 times on the basis of the thickness of said crown center measured at meridional section of tire, said crown portion having at its surface a tread pattern forming a lug arrangement as a whole, the width of said lug measured along the circumferential direction of tire being 2.0-2.2 times at the crown center area and 1.25-1.35 times at the shoulder area with respect to a width of a groove between said lugs measured along the circumferential direction of tire, and the radius of said crown portion being not less than 75% of the overall tire width under normal inflation pressure.
Claim 2
Dependent Claim
147 words
A wide base type pneumatic tire for construction vehicle comprising a crown portion and a shoulder, said tire having such a sectional thickness distribution that a thickness at a middle point between crown center and shoulder is 0.95-1.08 times and a thickness at said shoulder is 1.00-1.30 times on the basis of the thickness of said crown center measured at meridional section of tire, said crown portion having at its surface a tread pattern forming a lug arrangement as a whole, the width of said lug measured along the circumferential direction of tire being 2.0-2.2 times at the crown center area and 1.25-1.35 times at the shoulder area with respect to a width of a groove between said lugs measured along the circumferential direction of tire, and the radius of said crown portion being not less than 75% of the overall tire width under normal inflation pressure.
Claim 3
Dependent Claim
74 words
A wide base type pneumatic tire as claimed in claim 1, wherein said tread pattern further comprises a plurality of auxiliary channels provided on either side of said tread at a position corresponding to 30-38% of the tread width from said crown center in the circumferential direction of tire as a whole, said channel having a depth corresponding to 30-60% of said groove depth and a width corresponding to 1.5-4.5% of said tread width.
Claim 4
Dependent Claim
21 words
A wide base type pneumatic tire as claimed in claim 2, wherein said auxiliary channel has a width of 10-30 mm.
Claim 5
Dependent Claim
35 words
A wide base type pneumatic tire as claimed in claim 2, wherein in said auxiliary channel an angle between a side wall of the channel and a line perpendicular to the tread surface is 10°-20°.
Claim 6
Dependent Claim
28 words
A wide base type pneumatic tire as claimed in claim 1, wherein said crown portion is composed of tread rubber having a resilience of not less than 60%.
Claim 7
Dependent Claim
55 words
A wide base type pneumatic tire as claimed in claim 1, wherein said tire has such a sectional thickness distribution that the thickness at said middle point is 1.00-1.06 times and the thickness at said shoulder is 1.00-1.25 times on the basis of the thickness of said crown center measured at meridional section of tire.
Claim 8
Dependent Claim
53 words
A wide base type pneumatic tire as claimed in claim 1, wherein said tire has a ratio of a width between bead portions to the overall tire width of 0.75-0.90 and a ratio of a sectional tire height measured from bead base to the overall tire width of 0.75-0.93 under normal inflation pressure.
Claim 9
Dependent Claim
41 words
A wide base type pneumatic tire as claimed in claim 1, wherein in said tire is provided carcass cord plies having a cord angle of 50°-60°, preferably 53°-57° with respect to the rotation axis perpendicular to the circumferential direction of tire.
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) | 1979-02-23 | 1979-08-25 | 1980-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-23 | 1983-08-25 | 1984-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-23 | 1987-08-25 | 1988-02-24 | $7700.00 | Window Closed / Lapsed |