US3762827A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable dwell control attachment
Assignee: McDonnell Douglas Corp
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Filing: 1972-07-27
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Granted: 1973-10-02
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Expires: 1992-07-27
Abstract
Abstract An attachment for an automatic feed material cutting machine to cause the cutting tool to dwell at the end of its axial feed stroke before retraction, thereby improving the interior finish of the cut surface. Relatively slidable members having an adjustable stop means mounted thereon, allows relative axial movement between the cutting tool and the positive feed power source.
Inventors
- 👤 H Ziegelmeyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:58
CPC Classifications
B; B23; B23B; B23B29/00; B23B29/03; B23B29/034; B23B29/03432; B23B47/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
161 words
A variable dwell control attachment comprising an outer sleeve for attachment at its upper end to a housing of a rotary power source, a nose lock bushing attached to the lower end of said sleeve, a sensing sleeve telescopically slidable within said bushing, a cutting tool and spindle rotatably mounted within said outer sleeve and adapted to pass through said sensing sleeve, said spindle having a take-up spindle thereon with cylindrical walls having a compression spring therein, a dwell housing assembly having a cylindrical wall telescopically mounted over said spring and the cylindrical wall of said take-up spindle, said dwell housing assembly having means thereon for connection with a rotary power source, said take-up spindle having stop means thereon for engaging said sensing sleeve to limit axial movement of said cutting tool relative to said sensing sleeve, whereby further downward movement on said dwell housing assembly compresses said spring and permits continued rotation of said cutting tool without axial movement thereof.
Claim 2
Dependent Claim
161 words
A variable dwell control attachment comprising an outer sleeve for attachment at its upper end to a housing of a rotary power source, a nose lock bushing attached to the lower end of said sleeve, a sensing sleeve telescopically slidable within said bushing, a cutting tool and spindle rotatably mounted within said outer sleeve and adapted to pass through said sensing sleeve, said spindle having a take-up spindle thereon with cylindrical walls having a compression spring therein, a dwell housing assembly having a cylindrical wall telescopically mounted over said spring and the cylindrical wall of said take-up spindle, said dwell housing assembly having means thereon for connection with a rotary power source, said take-up spindle having stop means thereon for engaging said sensing sleeve to limit axial movement of said cutting tool relative to said sensing sleeve, whereby further downward movement on said dwell housing assembly compresses said spring and permits continued rotation of said cutting tool without axial movement thereof.
Claim 3
Dependent Claim
37 words
A variable dwell control attachment as set forth in claim 1 wherein said stop means is axially movable along said take-up spindle to thereby adjust the cutting tool movement relative to the end of said sensing sleeve.
Claim 4
Dependent Claim
49 words
A variable dwell control attachment as set forth in claim 1 wherein said spindle has a bore therethrough communicating with said cutting tool, and said take-up spindle has a coolant passage therein connected to said bore whereby said cutting tool may be supplied with a coolant during rotation thereof.
Claim 5
Dependent Claim
57 words
A variable dwell control attachment as set forth in claim 1 wherein said outer sleeve has a longitudinal slot therein, said sensing sleeve has a wing plate thereon extending outwardly through the slot, and means on the outer surface of said bushing attached to said wing plate for reSiliently urging said sensing sleeve downwardly through said bushing.
Claim 6
Dependent Claim
24 words
A variable dwell control attachment as in claim 1 wherein the power source exerts a rotary and downward force on said dwell housing assembly.
Claim 7
Dependent Claim
61 words
A variable dwell control attachment as in claim 1 wherein said take-up spindle and said dwell housing assembly are maintained in outwardly biased relationship by said compression spring until the take-up spindle stop means engages the sensing sleeve to stop further axial travel of the take-up spindle and the dwell housing assembly continues axial travel against the compression of said spring.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |