Patent US3206807A successfully refreshed from Google Patents.
US3206807A
Expired / Lapsed
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Method of and means for making cores for impellers of the francis type
Assignee: Studebaker Worthington Inc
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Filing: 1964-10-29
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Granted: 1965-09-21
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Expires: 1984-10-29
Abstract
No abstract record available.
Inventors
- 👤 Robert F Hoffman
- 👤 Edmund C O'gureck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:00
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/10; Y; Y10; Y10S; Y10S164/00; Y10S164/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
124 words
A CORE-MAKING MEANS FOR A VANE OF AN IMPELLER OF THE FRANCIS TYPE, SAID CORE-MAKING MEANS INCLUDING A CAVITY THEREIN, AND A VANE ELEMENT OF A PREDETERMINED DESIGN REMOVABLY MOUNTED IN THE CAVITY OF SAID CORE-MAKING MEANS, SAID VANE ELEMENT HAVING FRONT AND BACK SURFACE CONFIGURATIONS SUCH THAT CROSS SECTIONS OF SAID VANE ELEMENT TAKEN ALONG SPACED PARALLEL PLANES PASSED THERETHROUGH, EACH OF SAID SPACED PARALLEL PLANES BEING PARALLEL IN TURN TO A PLANE WHICH IS TANGENT TO THE ACTUAL OR PROJECTED BACK SURFACE OF THE VANE ELEMENT, HAVE FRONT AND BACK BOUNDARIES WHICH CONFORM SUBSTANTIALLY TO CIRCULAR ARCS HAVING A COMMON AXIS, WHEREBY SAID VANE ELEMENT MAY BE WITHDRAWN FROM A HARDENED CORE IN SAID CORE MAKING MEANS BY A TWISTING, ROTARY MOTION.
Claim 2
Dependent Claim
124 words
A CORE-MAKING MEANS FOR A VANE OF AN IMPELLER OF THE FRANCIS TYPE, SAID CORE-MAKING MEANS INCLUDING A CAVITY THEREIN, AND A VANE ELEMENT OF A PREDETERMINED DESIGN REMOVABLY MOUNTED IN THE CAVITY OF SAID CORE-MAKING MEANS, SAID VANE ELEMENT HAVING FRONT AND BACK SURFACE CONFIGURATIONS SUCH THAT CROSS SECTIONS OF SAID VANE ELEMENT TAKEN ALONG SPACED PARALLEL PLANES PASSED THERETHROUGH, EACH OF SAID SPACED PARALLEL PLANES BEING PARALLEL IN TURN TO A PLANE WHICH IS TANGENT TO THE ACTUAL OR PROJECTED BACK SURFACE OF THE VANE ELEMENT, HAVE FRONT AND BACK BOUNDARIES WHICH CONFORM SUBSTANTIALLY TO CIRCULAR ARCS HAVING A COMMON AXIS, WHEREBY SAID VANE ELEMENT MAY BE WITHDRAWN FROM A HARDENED CORE IN SAID CORE MAKING MEANS BY A TWISTING, ROTARY MOTION.
Claim 3
Independent Claim
141 words
THE METHOD OF MANUFACTURING A UNITARY CORE, FOR USE IN CASTING AN IMPELLER OF THE FRANCIS TYPE, FROM A CORE BOX HAVING A CAVITY FORMED THEREIN, SAID METHOD COM-/ PRISING POSITIONING IN SAID CORE BOX VANE ELEMENTS HAVING FRONT AND BACK SURFACE CONFIGURATIONS SUCH THAT CROSS SECTIONS OF EACH OF SAID VANE ELEMENTS TAKEN ALONG SPACED PARALLEL PLANES PASSED THERETHROUGH, EACH OF SAID SPACED PARALLEL PLANES BEING PARALLEL IN TURN TO A PLANE WHICH IS TANGENT TO THE ACTUAL OR PROJECTED BACK SURFACE OF THE VANE ELEMENT, HAVE FRONT AND BACK BOUNDRIES WHICH CONFORM SUBSTANTIALLY TO CIRCULAR ARCS HAVING A COMMON AXIS PACKING SUITABLE CORE MATERIAL IN SAID CAVITY AND ABOUT SAID VANE ELEMENTS, HARDENING THE CORE MATERIAL TO FORM SAID CORE, AND ROTATABLY REMOVING THE VANE ELEMENTS FROM A HARDENED CORE IN SAID CORE BOX BY A TWISTING, ROTARY MOTION.
Claim 4
Independent Claim
141 words
THE METHOD OF MANUFACTURING A UNITARY CORE, FOR USE IN CASTING AN IMPELLER OF THE FRANCIS TYPE, FROM A CORE BOX HAVING A CAVITY FORMED THEREIN, SAID METHOD COM-/ PRISING POSITIONING IN SAID CORE BOX VANE ELEMENTS HAVING FRONT AND BACK SURFACE CONFIGURATIONS SUCH THAT CROSS SECTIONS OF EACH OF SAID VANE ELEMENTS TAKEN ALONG SPACED PARALLEL PLANES PASSED THERETHROUGH, EACH OF SAID SPACED PARALLEL PLANES BEING PARALLEL IN TURN TO A PLANE WHICH IS TANGENT TO THE ACTUAL OR PROJECTED BACK SURFACE OF THE VANE ELEMENT, HAVE FRONT AND BACK BOUNDRIES WHICH CONFORM SUBSTANTIALLY TO CIRCULAR ARCS HAVING A COMMON AXIS PACKING SUITABLE CORE MATERIAL IN SAID CAVITY AND ABOUT SAID VANE ELEMENTS, HARDENING THE CORE MATERIAL TO FORM SAID CORE, AND ROTATABLY REMOVING THE VANE ELEMENTS FROM A HARDENED CORE IN SAID CORE BOX BY A TWISTING, ROTARY MOTION.
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) | 1968-09-20 | 1969-03-22 | 1969-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-20 | 1973-03-22 | 1973-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-20 | 1977-03-22 | 1977-09-21 | $7700.00 | Window Closed / Lapsed |