Patent US3822509A successfully refreshed from Google Patents.
US3822509A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Long-arm grinding machine
Assignee: Individual
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Filing: 1973-03-27
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Granted: 1974-07-09
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Expires: 1993-03-27
Abstract
Abstract A grinding machine for use in the machining of elongated surfaces, the machine having rotatable grinding means comprising at least two grinding heads disposed respectively at one end of two long shafts and rotatable respectively in two bearings which are interconnected by means of a piston and cylinder unit whereby said grinding heads can be urged towards or away from each other on actuation of said unit.
Inventors
- 👤 E Evertz
- 👤 R Seybold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:46
CPC Classifications
B; B24; B24B; B24B19/00; B24B27/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
148 words
A long-arm grinding machine for the machining of two opposed elongated internal surfaces of a hollow object, comprising two grinding heads disposed respectively at one end of two long shafts, said shafts being movable in a longitudinal direction parallel to the length of the elongated surfaces to be machined, said shafts being rotatable respectively in two bearing tubes, with the axes of said shafts being disposed in a common plane, each of said shafts being pivotable adjacent to its other end about an axis which is perpendicular to its own axis, and said two bearing tubes being connected together adjacent to said one end of said shafts by a single piston and cylinder unit connected to a source of pressurized fluid whereby actuation of said unit will result in pivoting of said shafts about said pivotable ends to urge said grinding heads towards or away from each other.
Claim 2
Dependent Claim
148 words
A long-arm grinding machine for the machining of two opposed elongated internal surfaces of a hollow object, comprising two grinding heads disposed respectively at one end of two long shafts, said shafts being movable in a longitudinal direction parallel to the length of the elongated surfaces to be machined, said shafts being rotatable respectively in two bearing tubes, with the axes of said shafts being disposed in a common plane, each of said shafts being pivotable adjacent to its other end about an axis which is perpendicular to its own axis, and said two bearing tubes being connected together adjacent to said one end of said shafts by a single piston and cylinder unit connected to a source of pressurized fluid whereby actuation of said unit will result in pivoting of said shafts about said pivotable ends to urge said grinding heads towards or away from each other.
Claim 3
Dependent Claim
63 words
The long-arm grinding machine as claimed in claim 1 characterized in that said piston and cylinder unit is connected in a circuit which includes a valve having a valve member which is adjustable to vary the pressure of fluid supplied to said piston and cylinder unit and thereby vary the pressure applied by said grinding heads to the surface or surfaces being macHined.
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) | 1977-07-08 | 1978-01-07 | 1978-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-08 | 1982-01-07 | 1982-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-08 | 1986-01-07 | 1986-07-09 | $7700.00 | Window Closed / Lapsed |