US3888145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for removing tread material from vehicle tires
Assignee: Kennametal Inc
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Filing: 1974-05-17
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Granted: 1975-06-10
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Expires: 1994-05-17
Abstract
Abstract A method and apparatus for removing tread material from vehicle tires preparatory to retreading the tire in which a rotary cutter rotating on an axis generally coplanar with the axis of rotation of the tire has sharp cutting elements therein which cut chips from the tread of the tire when the cutter and tire rotate relatively. The sharp cutting elements are formed of a hard wear resistant material such as cemented hard carbides and are detachably supported in a cutter body for ease of replacement therein and also so as to be indexable relative to the cutter body. The cutting elements, or inserts, have a high positive rake angle and the peripheries thereof are inclined at an angle slightly greater than the positive rake angle.
Inventors
- 👤 James W Heaton
- 👤 William E Fawcett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:47
CPC Classifications
B; B29; B29D; B29D30/00; B29D30/06; B29D30/52; B29D30/54; B29D2030/541; Y; Y10; Y10T; Y10T407/00; Y10T407/19; Y10T407/1906; Y10T407/1928; Y10T407/1932; Y10T407/1934; Y10T407/1936; Y10T407/1938; Y10T407/23; Y10T82/00; Y10T82/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
155 words
The method of removing the tread material from a pneumatic tire preparatory to recapping thereof which comprises; inflating the tire, rotating the inflated tire on the axis thereof, mounting hard wear resistant circular cutting elements in circumferentially spaced and axially coplanar relation in a holder with each insert having a sharp peripheral edge protruding radially from the holder, presenting the holder to the tread of the tire with the axis of the holder parallel to the axis of the tire and with the inserts at a positive rake angle of at least about 25*, moving the holder with the inserts therein relatively to the tire, and feeding the holder and tire relatively in the radial and axial directions of the tire to cause each insert to take cleanly cut chips of substantial size from the tire tread whereby the said inserts form a plurality of circumferentially and axially distributed shallow grooves in the tire tread.
Claim 2
Independent Claim
155 words
The method of removing the tread material from a pneumatic tire preparatory to recapping thereof which comprises; inflating the tire, rotating the inflated tire on the axis thereof, mounting hard wear resistant circular cutting elements in circumferentially spaced and axially coplanar relation in a holder with each insert having a sharp peripheral edge protruding radially from the holder, presenting the holder to the tread of the tire with the axis of the holder parallel to the axis of the tire and with the inserts at a positive rake angle of at least about 25*, moving the holder with the inserts therein relatively to the tire, and feeding the holder and tire relatively in the radial and axial directions of the tire to cause each insert to take cleanly cut chips of substantial size from the tire tread whereby the said inserts form a plurality of circumferentially and axially distributed shallow grooves in the tire tread.
Claim 3
Dependent Claim
14 words
The method according to claim 1 in which said chips are of substantial thickness.
Claim 4
Dependent Claim
35 words
The method according to claim 1 in which said holder rotates at a surface speed of about 10,000 feet per minute and said tire rotates at a surface speed of about 1,000 feet per minute.
Claim 5
Dependent Claim
40 words
The method according to claim 3 in which the inserts are spaced in the direction of movement thereof a distance such that each insert engages a substantial body of tread material each time the insert moves past the tire tread.
Claim 6
Dependent Claim
26 words
The method according to claim 4 in which said distance between each insert and the next following insert is on the order of about 4 inches.
References Cited (Backward Citations)
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Cited
US2664617A
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US3426828A
Cited
US3614973A
Cited
US3604084A
Cited
US3646984A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |