Patent US5355038A successfully refreshed from Google Patents.
US3818643A
Expired / Lapsed
US
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Grinding machine
Assignee: Olivetti SpA
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Filing: 1971-11-01
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Granted: 1974-06-25
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Expires: 1991-11-01
Abstract
Abstract A grinding machine having a movable workhead for carrying a workpiece and a movable wheelhead for carrying a grinding wheel, the workhead and the wheelhead being axially movable along intersecting paths. The wheelhead is provided with a lead screw drive in which the screw is fixed against rotation and the nut carried by the wheelhead platform is rotated by a gear drive but is fixed axially. This drive is used to provide micrometric movement. The screw terminates at one end in a piston in a hydraulic cylinder, this providing piston/cylinder drive for large amounts of wheelhead movement. Workhead feed is provided by a rotatable and axially displaceable spindle drive by a step-bystep electric motor through a gear train that converts the rotary motion output of the electric motion to corresponding axial movement of the spindle.
Inventors
- 👤 E Pagella
- 👤 C Guerci
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:03
CPC Classifications
B; B24; B24B; B24B5/00; B24B5/02; B24B47/00; B24B47/20
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
193 words
A grinding machine comprising: a machine frame, a wheelhead slidably mounted on said frame and movable rectilinearly thereon along a predetermined path, a threaded nut rotatably mounted on said wheelhead, the axis of said nut being parallel to said predetermined path, a threaded screw engaging said nut, the axis of said screw being parallel to said predetermined path, guide means mounted on said wheelhead and extending parallel to said predetermined path, a guide arm fixed to said screw and engaging said guide means to prevent said screw from rotating, a stepping motor connected to said nut for rotating said nut at different speeds, whereby rotation of said nut with respect to said screw causes said wheelhead to move along said predetermined path, a hydraulic cylinder mounted on said frame and a piston in said cYlinder and attached to one end of said screw, support means on said frame slidably supporting the other end of said screw, means for feeding pressure fluid to said cylinder to move said screw, and a stop pin mounted on said frame and engagable with said other end of said screw to limit the sliding movement of said screw.
Claim 2
Dependent Claim
193 words
A grinding machine comprising: a machine frame, a wheelhead slidably mounted on said frame and movable rectilinearly thereon along a predetermined path, a threaded nut rotatably mounted on said wheelhead, the axis of said nut being parallel to said predetermined path, a threaded screw engaging said nut, the axis of said screw being parallel to said predetermined path, guide means mounted on said wheelhead and extending parallel to said predetermined path, a guide arm fixed to said screw and engaging said guide means to prevent said screw from rotating, a stepping motor connected to said nut for rotating said nut at different speeds, whereby rotation of said nut with respect to said screw causes said wheelhead to move along said predetermined path, a hydraulic cylinder mounted on said frame and a piston in said cYlinder and attached to one end of said screw, support means on said frame slidably supporting the other end of said screw, means for feeding pressure fluid to said cylinder to move said screw, and a stop pin mounted on said frame and engagable with said other end of said screw to limit the sliding movement of said screw.
Claim 3
Dependent Claim
61 words
A grinding machine according to claim 1 further comprising: a tab attached to said screw, a flange attached to said nut and movable therewith, said flange comprising a plurality of teeth each having a flat surface engagable with said tab, whereby the rotational movement of said nut can be arrested by engagement of one of said flat surfaces with said tab.
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) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |