Patent US3795957A successfully refreshed from Google Patents.
US3795957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for boring and burnishing internal cylindrical surfaces of metallic workpieces
Assignee: Individual
•
Filing: 1973-02-15
•
Granted: 1974-03-12
•
Expires: 1993-02-15
Abstract
Abstract A combined precision boring and burnishing tool, particularly for use in a vertical-spindle boring machine wherein the workpiece is mounted in a support so that a stream of coolant can enter at the upper end and leaves at the lower end of the openend hole in the workpiece. The tool has a holder which is rotatable by a spindle and supports a set of radially adjustable cutters located in front of a set of radially adjustable burnishing rollers. The chips which are removed by the cutters are evacuated from the hole by the stream of coolant whose flow is throttled between the cutters and the burnishing rollers. The rollers are retracted in automatic response to movement of the tool in a direction to withdraw it from the hole. The cutters are retracted by hand through the intermediary of an adjusting mechanism which is accessible at the front or rear end of the tool and is actuated after the spindle is arrested but before the tool is withdrawn from the workpiece.
Inventors
- 👤 A Steusloff
- 👤 H Steusloff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:23
CPC Classifications
B; B23; B23B; B23B29/00; B23B29/03; B23B29/034; B23B29/03432; B23B29/03446; B23D; B23D77/00; B23D77/02; B23D77/04; B23D77/042; B23Q; B23Q11/00; B23Q11/0042; B23Q11/005; B24; B24B; B24B39/00; B24B39/02; B24B39/023; Y; Y10; Y10T; Y10T29/00; Y10T29/47; Y10T29/51; Y10T29/5147; Y10T407/00; Y10T407/10; Y10T408/00; Y10T408/34; Y10T408/44
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
296 words
In a machine tool, particularly in a vertical-spindle boring machine, apparatus for precision boring and burnishing of workpieces having open-end holes, said apparatus comprising a hollow support for rEception of a workpiece; means for circulating a fluid through the hole of the workpiece in said support so that the fluid enters at one end and leaves at the other end of the hole; and a combined boring and burnishing tool having a front end and a rear end and including a holder movable axially into and toward or away from the other end of the hole in the workpiece in said support, a spindle operatively connected with and arranged to rotate said holder, at least one cutter mounted in said holder at the front end of said tool to remove material from the workpiece in said support during rotation and axial movement of said holder toward said other end of the hole whereby the thus removed material is evacuated by said fluid, said cutter being movable substantially radially of said holder, adjusting means accessible at one end of said tool and being actuatable to effect a retraction of said cutter into said holder prior to movement of said holder away from the other end of the hole in the workpiece in said support, at least one burnishing element mounted in said holder behind said cutter, as considered in the direction of fluid flow through the hole of the workpiece in said support, to treat the internal surface of the workpiece behind said cutter, said burnishing element being movable substantially radially of said holder, and means for retracting said burnishing element from engagement with the workpiece in response to movement of said holder away from said other end of the hole in the workpiece in said support.
Claim 2
Dependent Claim
296 words
In a machine tool, particularly in a vertical-spindle boring machine, apparatus for precision boring and burnishing of workpieces having open-end holes, said apparatus comprising a hollow support for rEception of a workpiece; means for circulating a fluid through the hole of the workpiece in said support so that the fluid enters at one end and leaves at the other end of the hole; and a combined boring and burnishing tool having a front end and a rear end and including a holder movable axially into and toward or away from the other end of the hole in the workpiece in said support, a spindle operatively connected with and arranged to rotate said holder, at least one cutter mounted in said holder at the front end of said tool to remove material from the workpiece in said support during rotation and axial movement of said holder toward said other end of the hole whereby the thus removed material is evacuated by said fluid, said cutter being movable substantially radially of said holder, adjusting means accessible at one end of said tool and being actuatable to effect a retraction of said cutter into said holder prior to movement of said holder away from the other end of the hole in the workpiece in said support, at least one burnishing element mounted in said holder behind said cutter, as considered in the direction of fluid flow through the hole of the workpiece in said support, to treat the internal surface of the workpiece behind said cutter, said burnishing element being movable substantially radially of said holder, and means for retracting said burnishing element from engagement with the workpiece in response to movement of said holder away from said other end of the hole in the workpiece in said support.
Claim 3
Dependent Claim
73 words
Apparatus as defined in claim 1, wherein said support includes a plurality of separable portions defining a chamber for a workpiece, and said holder includes a back support having a conical external surface, said burnishing element constituting a roller which rolls along said conical surface and along the internal surface of the workpiece in said support while said holder rotates and moves axially toward the other end of the hole in such workpiece.
Claim 4
Dependent Claim
35 words
Apparatus as defined in claim 1, wherein said spindle is provided at the rear end of said tool and said adjusting means includes a portion which is accessible at said rear end of said tool.
Claim 5
Dependent Claim
52 words
Apparatus as defined in claim 1, wherein said adjusting means is accessible at said front end of said tool and further comprising actuating means extending into said support to engage said adjusting means upon completed movement of said cutter to said other end of the hole in the workpiece in said support.
Claim 6
Dependent Claim
61 words
Apparatus as defined in claim 1, wherein said adjusting means includes a conical portion axially movably mounted in said holder and said tool further comprises means for biasing said cutter against said conical portion so that said cutter moves radially under the action of or against the opposition of said biasing means in response to axial movement of said conical portion.
Claim 7
Dependent Claim
61 words
Apparatus as defined in claim 5, wherein said spindle is hollow and is located at said rear end of said tool, said adjusting means further comprising shifting means connected with said conical portion and extending into said spindle and actuating means provided on said spindle and operable by hand to move said conical portion axially by way of said shifting means.
Claim 8
Dependent Claim
37 words
Apparatus as defined in claim 6, wherein said actuating means comprises a gear rotatably mounted in said spindle and arranged to move said shifting means axially in response to rotation thereof, and means for rotating said gear.
Claim 9
Dependent Claim
40 words
Apparatus as defined in claim 7, wherein said means for rotating said gear comprises a pinion mating with said gear and eccentrically mounted in said spindle, and an internally toothed sleeve mataing with said pinion and rotatably surrounding said spindle.
Claim 10
Dependent Claim
85 words
Apparatus as defined in claim 1, wherein said adjusting means comprises a conical member axially movably mounted in said holder to move said cutter radially of said holder in response to axial movement thereof, said conical member having an exposed first coupling portioN at said front end of said tool, and a complementary second coupling portion extending into said support to engage said first coupling portion upon completed movement of said holder toward the other end of the hole in the workpiece of said support.
Claim 11
Dependent Claim
78 words
Apparatus as defined in claim 9, wherein said second coupling portion is rotatable relative to said support in response to engagement with said first coupling portion, said adjusting means further comprising arresting means actuatable upon stoppage of said spindle to hold said first coupling portion against rotation by way of said second coupling portion so that said conical member is movable axially of said holder in response to rotation of said holder upon actuation of said arresting means.
Claim 12
Dependent Claim
51 words
Apparatus as defined in claim 1, wherein said tool further comprises flow restricting means surrounding said holder between said cutter and said burnishing element to throttle the flow of fluid in the hole of the workpiece in said support during movement of said holder toward the other end of the hole.
Claim 13
Dependent Claim
31 words
Apparatus as defined in claim 11, wherein said flow restricting means has at least one channel arranged to direct fluid against the region of contact between the workpiece and said cutter.
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) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |