Patent US2897962A successfully refreshed from Google Patents.
Patent US3336821A successfully refreshed from Google Patents.
US3336821A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control of machine tools
Assignee: Giddings and Lewis Fraser Ltd
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Filing: 1965-10-27
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Granted: 1967-08-22
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Expires: 1985-10-27
Abstract
No abstract record available.
Inventors
- 👤 Firth John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:28
CPC Classifications
B; B23; B23Q; B23Q15/00; B23Q15/20; B23Q15/22; B23Q15/225; B23G; B23G1/00; B23G1/16; B23Q5/00; B23Q5/22; B23Q5/26; B23Q5/261; B23Q5/263; Y; Y10; Y10T; Y10T408/00; Y10T408/16; Y10T408/17; Y10T408/172; Y10T408/65; Y10T408/675; Y10T408/6757
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
172 words
A DEVICE FOR CONTROLLING HYDRAULICALLY OPERATED MEANS FOR FEEDING THE TOOL OF A MACHINE TOOL RELATIVE TO A WORKPIECE, COMPRISING A SPINDLE, A TOOL HOLDER CONCENTRIC WITH SPINDLE AND YIELDABLY MOUNTED TO THE SPINDLE IN AXIAL ALIGNMENT THEREWITH TO ENABLE RELATIVE AXIAL DISPLACEMENT OF THE TOOL HOLDER AND SPINDLE, MEANS OPERATED BY FLOW OF HYDRAULIC FLUID FOR FEEDING SAID SPINDLE AND TOOL HOLDER TOWARDS OR AWAY FROM THE WORKPIECE, MEANS FOR THROTTLING THE FLOW OF HYDRAULIC FLUID TO REGULATE THE SPEED OF SAID FEED MEANS UPON AND IN ACCORDANCE WITH THE EXTENT OF RELATIVE DISPLACEMENT OF THE TOOL HOLDER AND SPINDLE, AS WOULD OCCUR UPON IMPACT WITH THE WORKPIECE OF A TOOL IN THE TOOL HOLDER, AND VALVE MEANS INCLUDING IN A LINE FOR THE FLOW OF HYDRAULIC FLUID, THE LINE SERVING TO CAUSE THE FLUID FLOW TO BY-PASS THE THROTTLING MEANS IN THE EVENT THAT THE THROTTLING MEANS IS CLOSED TO FLUID FLOW, THE VALVE MEANS PROVIDING A PREDETERMINED RATE OF FLUID FLOW THUS TO PROVIDE A PREDETERMINED SPEED OF FEED.
Claim 2
Independent Claim
172 words
A DEVICE FOR CONTROLLING HYDRAULICALLY OPERATED MEANS FOR FEEDING THE TOOL OF A MACHINE TOOL RELATIVE TO A WORKPIECE, COMPRISING A SPINDLE, A TOOL HOLDER CONCENTRIC WITH SPINDLE AND YIELDABLY MOUNTED TO THE SPINDLE IN AXIAL ALIGNMENT THEREWITH TO ENABLE RELATIVE AXIAL DISPLACEMENT OF THE TOOL HOLDER AND SPINDLE, MEANS OPERATED BY FLOW OF HYDRAULIC FLUID FOR FEEDING SAID SPINDLE AND TOOL HOLDER TOWARDS OR AWAY FROM THE WORKPIECE, MEANS FOR THROTTLING THE FLOW OF HYDRAULIC FLUID TO REGULATE THE SPEED OF SAID FEED MEANS UPON AND IN ACCORDANCE WITH THE EXTENT OF RELATIVE DISPLACEMENT OF THE TOOL HOLDER AND SPINDLE, AS WOULD OCCUR UPON IMPACT WITH THE WORKPIECE OF A TOOL IN THE TOOL HOLDER, AND VALVE MEANS INCLUDING IN A LINE FOR THE FLOW OF HYDRAULIC FLUID, THE LINE SERVING TO CAUSE THE FLUID FLOW TO BY-PASS THE THROTTLING MEANS IN THE EVENT THAT THE THROTTLING MEANS IS CLOSED TO FLUID FLOW, THE VALVE MEANS PROVIDING A PREDETERMINED RATE OF FLUID FLOW THUS TO PROVIDE A PREDETERMINED SPEED OF FEED.
References Cited (Backward Citations)
US3273182A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-08-21 | 1971-02-20 | 1971-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-21 | 1975-02-20 | 1975-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-21 | 1979-02-20 | 1979-08-22 | $7700.00 | Window Closed / Lapsed |