US3700345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Eccentric boring spindle
Assignee: Cross Europa Werk GmbH
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Filing: 1971-05-10
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Granted: 1972-10-24
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Expires: 1991-05-10
Abstract
Abstract A driven spindle carries a boring bar which is rotatable on an eccentric axis to adjust the cutting edges. The boring bar is mounted in the spindle by at least one bushing having an elastically deformable bearing surface which can be forced against the boring bar by an incompressible pressure medium. With the pressure released, the boring bar may be rotatably adjusted. Raising the pressure will reduce or eliminate the radial play of the boring bar in the spindle.
Inventors
- 👤 Paul Schubert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:57
CPC Classifications
B; B23; B23B; B23B29/00; B23B29/03; B23B29/034; B23B29/03432; B23B29/03478; B23Q; B23Q1/00; B23Q1/25; B23Q1/26; B23Q1/28; B23Q1/287; Y; Y10; Y10T; Y10T408/00; Y10T408/76; Y10T408/83; Y10T408/85; Y10T408/854; Y10T408/858; Y10T408/8588; Y10T408/85892
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
161 words
In combination, a driven spindle, an eccentric bore in said spindle, a tool-carrying boring bar extending through said bore, means preventing substantial axial movement of said boring bar with respect to said spindle, at least one bushing disposed in said bore and surrounding said boring bar, means for selectively rotating said boring bar within said spindle bore to adjust the eccentricity of said tool with respect to the spindle axis, an elastically deformable bearing surface on said bushing, a chamber disposed between the bushing and spindle and surrounding said surface, an incompressible fluid in said chamber, and means for adjusting the pressure of said fluid, whereby said deformable bearing surface may be moved between an inner position in which it engages said boring bar to prevent radial play thereof and to disenable said eccentric adjusting means, and an outer position in response to reduction of fluid pressure to permit rotation of said boring bar and therefore enable said eccentric adjusting means.
Claim 2
Dependent Claim
161 words
In combination, a driven spindle, an eccentric bore in said spindle, a tool-carrying boring bar extending through said bore, means preventing substantial axial movement of said boring bar with respect to said spindle, at least one bushing disposed in said bore and surrounding said boring bar, means for selectively rotating said boring bar within said spindle bore to adjust the eccentricity of said tool with respect to the spindle axis, an elastically deformable bearing surface on said bushing, a chamber disposed between the bushing and spindle and surrounding said surface, an incompressible fluid in said chamber, and means for adjusting the pressure of said fluid, whereby said deformable bearing surface may be moved between an inner position in which it engages said boring bar to prevent radial play thereof and to disenable said eccentric adjusting means, and an outer position in response to reduction of fluid pressure to permit rotation of said boring bar and therefore enable said eccentric adjusting means.
Claim 3
Dependent Claim
23 words
The combination according to claim 1, said elastically deformable bearing surface being formed by a reduction in the outer diameter of said bushing.
Claim 4
Dependent Claim
25 words
The combination according to claim 2, said reduction in outer diameter forming a peripheral annular pressure chamber into which the pressure medium can be Forced.
Claim 5
Dependent Claim
15 words
The combination according to claim 1, there being two such bushings in axially spaced relationship.
Claim 6
Dependent Claim
34 words
The combination according to claim 1, said means for conducting fluid to said chamber comprising a channel in said spindle and an adjustable pressure plug threadably mounted in the outer end of said channel.
Claim 7
Dependent Claim
28 words
The combination according to claim 5, there being two of said bushings in an axially spaced relation, with a channel and an adjustable pressure plug for each bushing.
Claim 8
Dependent Claim
45 words
The combination according to claim 1, further provided with means for supplying said chamber with fluid comprising a channel leading through the spindle to the outside, and a stuffing box at the outer end of the channel for controlling the pressure exerted on said surface.
Claim 9
Dependent Claim
30 words
The combination according to claim 7, there being two such bushings in axially spaced relation, said channel leading from the stuffing box to the surfaces of both of said bushings.
Claim 10
Dependent Claim
23 words
The combination according to claim 8, said surfaces being formed by reduced outer diameters in said bushings which form peripheral annular pressure chambers.
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) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |