US3577685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grinding machine with a feed control device
Assignee: NTN Europe SA
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Filing: 1968-04-10
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Granted: 1971-05-04
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Expires: 1988-04-10
Abstract
Abstract The device comprises the combination of two movable wedge members having each a moderately inclined plane, said wedge members being displaceable in two directions substantially at right angles to each other, the first wedge member abutting at the end of the approach stroke of the grinding wheel against a fixed stop of the frame structure of the machine, the second wedge member determining the end position of the first one, electric means for detecting the end position of the first wedge member in relation to the other one and controlling the finishing and planishing operations performed on the workpiece, by controlling the relative positions of the wedge members.
Inventors
- 👤 Louis Corbex
- 👤 Roger Burdet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:06
CPC Classifications
B; B24; B24B; B24B49/00; B24B49/02; B24B49/04; B24B47/00; B24B47/20
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
170 words
A device for controlling a grinding head feed in a grinding machine, with automatic dimensional correction, said grinding machine comprising a frame structure, a grinding wheel mounted on a spindle of a movable head and a hydraulic actuator of the cylinder-and-piston type for controlling head movements, said device being characterized in that it comprises first and second movable wedge members having each an inclined plane of relatively moderate inclination, movable with said movable head and adapted themselves to move in directions substantially at right angles to each other, the first wedge member abutting at the end of the approach stroke of the grinding wheel against a fixed abutment of the frame structure of the machine, the second wedge member determining the end position of the first member, an electric device for detecting the end position of said first wedge member in relation to said second wedge member and controlling the finishing and planishing operations to be carried out on a workpiece by controlling the relative position of said wedge members.
Claim 2
Independent Claim
170 words
A device for controlling a grinding head feed in a grinding machine, with automatic dimensional correction, said grinding machine comprising a frame structure, a grinding wheel mounted on a spindle of a movable head and a hydraulic actuator of the cylinder-and-piston type for controlling head movements, said device being characterized in that it comprises first and second movable wedge members having each an inclined plane of relatively moderate inclination, movable with said movable head and adapted themselves to move in directions substantially at right angles to each other, the first wedge member abutting at the end of the approach stroke of the grinding wheel against a fixed abutment of the frame structure of the machine, the second wedge member determining the end position of the first member, an electric device for detecting the end position of said first wedge member in relation to said second wedge member and controlling the finishing and planishing operations to be carried out on a workpiece by controlling the relative position of said wedge members.
Claim 3
Dependent Claim
60 words
A feed control device according to claim 1, further comprising a double-acting hydraulic actuator adapted to cause said first wedge member to move along a vertical face of the grinding head and voltage divider means having a slider adapted to follow the inclined face of the second wedge member which is movable along a horizontal face of said grinding head.
Claim 4
Dependent Claim
62 words
A feed control device according to claim 2, further comprising a compressed-air duct in said frame, the action effected by the actuator on said first wedge member beginning when said first wedge member closes said compressed air duct at the end of the approach stroke of said grinding head, a pressure-responsive switch causing the operation of a distributor valve of said actuator.
Claim 5
Dependent Claim
38 words
A feed control device according to claim 2, further comprising means to control the feed rate of said first wedge member by adjusting the rate of flow of the hydraulic fluid from said actuator through parallel arranged diaphragms.
Claim 6
Dependent Claim
51 words
A feed control device according to claim 2, wherein equilibrium between the value of the resistance of said voltage divider means and a preset resistance value releases an electric signal controlling the closing of a valve obturating one of said parallel diaphragms, thus determining the feed rate of the finishing phase.
Claim 7
Dependent Claim
50 words
A feed control device according to claim 5, wherein said voltage divider means is adapted, at the end of the finishing feed stroke corresponding to the abutment of the first wedge member against the second wedge member, to stop any further movements of the members concerned during the planishing phase.
Claim 8
Dependent Claim
56 words
A feed control device according to claim 2, furtHer comprising time-switch means which at the end of its operating time controls the reversal of supply of hydraulic fluid under pressure to the actuator controlling the grinding head to stop the planishing operation and reverse the supply of fluid to the actuator of said first wedge member.
Claim 9
Dependent Claim
57 words
A feed control device according to claim 1, further comprising a step-by-step system responsive to a device for measuring the dimension of the workpiece after machining and which permits controlling the abutment position of said wedge members by displacing said second wedge member in order to correct for the dimensions of the next workpiece to be 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) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |