US3849019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for cutting holes in porcelainized metal
Assignee: Relton Corp
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Filing: 1973-03-12
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Granted: 1974-11-19
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Expires: 1993-03-12
Abstract
Abstract There is described a tool for scoring the procelain coating of a porcelainized metal object such as a sink or tub in which a plurality of V-shaped pointed teeth project from an annular rotating member. The annular rotating member is slidably supported on a rotating shaft and is spring-loaded to urge the rotating member in an axial direction corresponding to the direction of the pointed teeth. After the porcelain coating is scored by the tool, an opening is cut through the porcelain and metal to a diameter slightly smaller than the diameter of the groove scored by the teeth.
Inventors
- 👤 M Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:22
CPC Classifications
B; B23; B23B; B23B51/00; B23B51/04; B23B51/0426; Y; Y10; Y10T; Y10T279/00; Y10T279/17; Y10T279/17017; Y10T408/00; Y10T408/03; Y10T408/73; Y10T408/75; Y10T408/89; Y10T408/896; Y10T408/8973; Y10T408/909; Y10T408/9093
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
152 words
A tool for cutting holes in porcelain coated metal with a rotary drill, comprising a guide shaft adapted to be held at one end in the chuck of the drill, the other end of the guide shaft being adapted to extend through a pilot hole in the metal, a cutter head slidably engaging the shaft, slidable means locking the head to the shaft for rotating the head from the shaft while permitting the head to move freely lengthwise of the shaft, sprIng means connected between the shaft and the head, the spring means urging the head toward the pilot hole engaging end of the shaft, the head having an annular flange coaxial with the shaft and projecting toward the pilot hole end of the shaft, and a plurality of cutting teeth on the end of the flange, the teeth projecting in a direction parallel to the axis of rotation of the shaft.
Claim 2
Dependent Claim
152 words
A tool for cutting holes in porcelain coated metal with a rotary drill, comprising a guide shaft adapted to be held at one end in the chuck of the drill, the other end of the guide shaft being adapted to extend through a pilot hole in the metal, a cutter head slidably engaging the shaft, slidable means locking the head to the shaft for rotating the head from the shaft while permitting the head to move freely lengthwise of the shaft, sprIng means connected between the shaft and the head, the spring means urging the head toward the pilot hole engaging end of the shaft, the head having an annular flange coaxial with the shaft and projecting toward the pilot hole end of the shaft, and a plurality of cutting teeth on the end of the flange, the teeth projecting in a direction parallel to the axis of rotation of the shaft.
Claim 3
Dependent Claim
17 words
The tool of claim 1 wherein each of the teeth is formed with a V-shaped cutting edge.
Claim 4
Dependent Claim
15 words
The tool of claim 2 wherein each of the teeth is formed from silicon carbide.
Claim 5
Dependent Claim
16 words
The tool of claim 2 wherein the angle of the V-shaped cutting edge is approximately 30*.
Claim 6
Dependent Claim
28 words
The tool of claim 2 wherein the cutting edge of each tooth extends at a small angle to the plane of the axis of rotation of the shaft.
Claim 7
Dependent Claim
23 words
The tool of claim 5 wherein the tip of the cutting edge of each tooth trails the base end of the cutting edge.
References Cited (Backward Citations)
US1789830A
Cited
US2435648A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |