US3738767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable boring bar
Assignee: Kennametal Inc
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Filing: 1971-07-15
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Granted: 1973-06-12
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Expires: 1991-07-15
Abstract
Abstract An adjustable boring bar characterized in that the bar has a transverse bore in which the overlapped shank portions of a pair of cutter elements are simultaneously moved radially outward or inward with respect to the longitudinal axis of the bar by screw actuated cam means which engages inclined surfaces of the respective shank portions. The screw actuated cam means comprises a nut movable in another transverse bore in the bar by rotation of a dial screw, said nut having an inclined cam face which engages a cam plunger which is longitudinally movable in a central longitudinal bore in the bar, said plunger having a Vshaped tongue which engages the respective inclined surfaces of the shank portions of the cutter elements. The adjustable boring bar herein is further characterized in that the cutter elements are of T-shaped configuration with the shanks overlapped as aforesaid in a transverse bore in the bar and with the crossbar portions guided and supported by integral shoulders formed on the bar, the cross bar portions having provision for mounting of carbide or like inserts.
Inventors
- 👤 M Benjamin
- 👤 W Miles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:19
CPC Classifications
B; B23; B23B; B23B29/00; B23B29/03; B23B29/034; B23B29/03403; B23B29/03417; Y; Y10; Y10T; Y10T408/00; Y10T408/83; Y10T408/85; Y10T408/858; Y10T408/8588; Y10T408/85892; Y10T408/85895; Y10T408/8593
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
137 words
An adjustable boring bar comprising a bar having a longitudinal bore intersected by transverse bores; a pair of cutter elements movable lengthwise in a first transverse bore and having cutting edges at their radially outer extremities; screw actuated cam means in a second transverse bore; a cam plunger movable lengthwise in said longitudinal bore and having engagement with said cam means and with said cutter elements to move the latter in said one transverse bore responsive to actuation of said cam means; said cam means comprising a nut having a beveled cam face engaging a tapered end of said plunger, and a screw operative, when turned, to move said nut lengthwise in said second bore; said nut being restrained against rotation in said second bore by eccentric disposition of the interengaged threads of said nut and screw.
Claim 2
Dependent Claim
137 words
An adjustable boring bar comprising a bar having a longitudinal bore intersected by transverse bores; a pair of cutter elements movable lengthwise in a first transverse bore and having cutting edges at their radially outer extremities; screw actuated cam means in a second transverse bore; a cam plunger movable lengthwise in said longitudinal bore and having engagement with said cam means and with said cutter elements to move the latter in said one transverse bore responsive to actuation of said cam means; said cam means comprising a nut having a beveled cam face engaging a tapered end of said plunger, and a screw operative, when turned, to move said nut lengthwise in said second bore; said nut being restrained against rotation in said second bore by eccentric disposition of the interengaged threads of said nut and screw.
Claim 3
Dependent Claim
43 words
The adjustable boring bar of claim 1 wherein said screw has a radially enlarged dial means at one end and a spring washer at the other end which bears on said bar to urge said dial means into frictional engagement with said bar.
Claim 4
Dependent Claim
145 words
An adjustable boring bar comprising a bar having a longitudinal bore intersected by transverse bores; a pair of cutter elements of T-shaped form having shank portions movable lengthwise in a first transverse bore and having radially outer crossbar portions with cutting edges at their radially outer extremities; said bar having shoulders engaged by the respective crossbar portions to guide said elements during adjustment and to support them when work load is imposed on said cutting edges; said cutting edges being formed on indexible inserts; means on said crossbar portions for securing said inserts on the axially forward portions thereof; screw actuated cam means in a second transverse bore; a cam plunger movable lengthwise in said longitudinal bore and having engagement with said cam means and with said cutter elements to move the latter in said one transverse bore responsive to actuation of said cam means.
Claim 5
Dependent Claim
145 words
An adjustable boring bar comprising a bar having a longitudinal bore intersected by transverse bores; a pair of cutter elements of T-shaped form having shank portions movable lengthwise in a first transverse bore and having radially outer crossbar portions with cutting edges at their radially outer extremities; said bar having shoulders engaged by the respective crossbar portions to guide said elements during adjustment and to support them when work load is imposed on said cutting edges; said cutting edges being formed on indexible inserts; means on said crossbar portions for securing said inserts on the axially forward portions thereof; screw actuated cam means in a second transverse bore; a cam plunger movable lengthwise in said longitudinal bore and having engagement with said cam means and with said cutter elements to move the latter in said one transverse bore responsive to actuation of said cam means.
Claim 6
Dependent Claim
27 words
The adjustable boring bar of claim 3 wherein said means on said crossbar portions comprise screw-actuated clamps operative to clamp said inserts to the respective cross-bar portions.
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) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |