Patent US3918209A successfully refreshed from Google Patents.
US3918209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal removal apparatus
Assignee: BOC Ltd Australia
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Filing: 1974-08-19
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Granted: 1975-11-11
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Expires: 1994-08-19
Abstract
Abstract A machine for removing metal from the back of butt-welded seams, to form a groove in which further weld metal can be deposited, uses a motor-driven shaped grinding wheel adapted to be biased about a pivotal axis into contact with the workpiece.
Inventors
- 👤 Stanley Crawley
- 👤 Walter Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:38
CPC Classifications
B; B24; B24B; B24B41/00; B24B41/002; B24B19/00; B24B19/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
90 words
Metal removal apparatus, including a resinoid-bonded grinding wheel mounted on a sub-assembly also supporting a motor arranged to drive the grinding wheel at a high speed, in which the subassembly is mounted on a slide supported by an arm pivotally mounted on a support shaft; a riding roller mounted on one end of a lever also pivoted on the support shaft and able to be pivoted by controlled amounts relatively to the arm supporting the subassembly, the roller axis being parallel to the grinding wheel axis and adjustably spaced therefrom.
Claim 2
Dependent Claim
90 words
Metal removal apparatus, including a resinoid-bonded grinding wheel mounted on a sub-assembly also supporting a motor arranged to drive the grinding wheel at a high speed, in which the subassembly is mounted on a slide supported by an arm pivotally mounted on a support shaft; a riding roller mounted on one end of a lever also pivoted on the support shaft and able to be pivoted by controlled amounts relatively to the arm supporting the subassembly, the roller axis being parallel to the grinding wheel axis and adjustably spaced therefrom.
Claim 3
Dependent Claim
25 words
Metal removal apparatus as claimed in claim 1, in which the slide is biased to a position intermediate the limits of movement of the slide.
Claim 4
Dependent Claim
27 words
Metal removal apparatus as claimed in claim 2, in which the slide is biased by two compression springs acting on the slide in opposition to each other.
Claim 5
Dependent Claim
22 words
Metal removal apparatus as claimed in claim 1, in which the position of the arm along the support shaft is also adjustable.
Claim 6
Dependent Claim
74 words
Metal removal apparatus as claimed in claim 1 in which the lever carrying the riding roller has an offset extension extending adjacent to a similar extension from the said arm, and in which the outer ends of both extensions are connected by a member of adjustable effectiVe length which therefore controls the angular positions of both extensions, and therefore of the axes of the riding roller and grinding wheel, relative to the support shaft.
Claim 7
Dependent Claim
68 words
Metal removal apparatus as claimed in claim 5, in which the member of adjustable effective length is a rod of which part is screw-threaded and is engaged by a nut mounted in one extension, and of which part is plain and is engaged by a collar mounted in the other extension, whereby rotation of the rod is effective to alter the spacing between the nut and the collar.
Claim 8
Dependent Claim
56 words
Metal removal apparatus as claimed in claim 5, in which one of the said extensions carries an adjustable stop adapted to come into contact with a member which is fixed relatively to the support shaft so as to define one limit position for joint movement of the riding roller and grinding wheel about the support shaft.
Claim 9
Dependent Claim
57 words
Metal removal apparatus as claimed in claim 1, in which the line of action of the centre of gravity of the sub-assembly is spaced horizontally from the support shaft when the apparatus is in its working position, so that riding roller and grinding wheel are biased by gravity into contact with a workpiece positioned below the apparatus.
Claim 10
Dependent Claim
66 words
Metal removal apparatus as claimed in claim 1, in which the support shaft and the members carried thereby are connected to a horizontally-movable boom by means of a coupling adapted to permit movement of the support shaft about a vertical axis between two limit positions which are disposed orthogonally relatively to each other, the coupling being able to be locked in each of the limit positions.
Claim 11
Dependent Claim
40 words
Metal removal apparatus as claimed in claim 9, in which the boom supports a seat for the operator which is displaced to one side of the plane of the grinding wheel when it is in one of its orthogonal positions.
Claim 12
Dependent Claim
29 words
Metal removal apparatus as claimed in claim 1 in which the support for the grinding wheel also carries means for dressing the wheel to give it a desired profile.
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) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |