US3913197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Positive lock insert
Assignee: Carboloy Inc
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Filing: 1973-11-19
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Granted: 1975-10-21
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Expires: 1993-11-19
Abstract
Abstract A locking structure for locking a cutting insert to a tool holder, the insert having a generally hour-glass shaped lockscrew receiving aperture therethrough. The lock-screw is provided with a head having a lower section which flares outwardly from the shank, a central cylindrical section and an upper section which converges in generally frusto-conical fashion. The axis of the lock-screw receiving aperture in the tool holder is slanted toward the plane or planes of one or more locating abutments on the holder. The components, when assembled, provide a positive lockdown for the insert in the tool holder, force the insert positively against the locating abutment or abutments and, yet, permit the insert to be removed without complete removal of the lock-screw.
Inventors
- 👤 Heinz K Wolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:52
CPC Classifications
B; B23; B23C; B23C5/00; B23C5/16; B23C5/20; B23C5/22; B23C5/2204; B23C5/2208; B23C5/2213; B23C2200/00; B23C2200/20; B23C2200/201; B23C2200/36; B23C2200/367; Y; Y10; Y10T; Y10T407/00; Y10T407/19; Y10T407/1906; Y10T407/1934
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
265 words
In a locking apparatus for locking cutting inserts onto a tool body, the body having a bed on which the insert is adapted to be positioned, one or more locating abutments adjacent the bed against which the insert is abutted to locate it in cutting position, and a tapped hole extending into said body at an angle from said bed toward the general plane of said locating abutment, the improvement comprising said insert including a central aperture at least a portion of said aperture being frusto conical such that when said insert is positioned on said bed the exposed portion of said aperture converges toward said bed, a locking screw having a threaded shank receivable in said hole and a head, said head having a lower section which flares outwardly from said shank and an upper section which converges inwardly toward the top of said screw, the diameter of said aperture at its narrowest point being greater than the diameter of said head at its widest point, said insert being forced into contact with said abutment and said bed with portions of said insert in contact with both said upper and lower sections of said head, and said lower section of said head engaging and overlying said exposed portion of said aperture adjacent said abutment and said upper section of said head engaging and overlying said exposed portion of said aperture remote from said abutment when said locking screw is tightened with said insert on said bed to positively lock said insert in position preventing physical removal of said insert without loosening said locking screw.
Claim 2
Dependent Claim
265 words
In a locking apparatus for locking cutting inserts onto a tool body, the body having a bed on which the insert is adapted to be positioned, one or more locating abutments adjacent the bed against which the insert is abutted to locate it in cutting position, and a tapped hole extending into said body at an angle from said bed toward the general plane of said locating abutment, the improvement comprising said insert including a central aperture at least a portion of said aperture being frusto conical such that when said insert is positioned on said bed the exposed portion of said aperture converges toward said bed, a locking screw having a threaded shank receivable in said hole and a head, said head having a lower section which flares outwardly from said shank and an upper section which converges inwardly toward the top of said screw, the diameter of said aperture at its narrowest point being greater than the diameter of said head at its widest point, said insert being forced into contact with said abutment and said bed with portions of said insert in contact with both said upper and lower sections of said head, and said lower section of said head engaging and overlying said exposed portion of said aperture adjacent said abutment and said upper section of said head engaging and overlying said exposed portion of said aperture remote from said abutment when said locking screw is tightened with said insert on said bed to positively lock said insert in position preventing physical removal of said insert without loosening said locking screw.
Claim 3
Dependent Claim
34 words
The apparatus as set forth in claim 1 wherein said insert has opposed faces joined by sides which are generally perpendicular to said faces and wherein said abutments are generally perpendicular to said bed.
Claim 4
Dependent Claim
33 words
The apparatus as set forth in claim 2 wherein said insert is adapted to be positioned on said bed on either of its opposed, parallel faces and wherein said aperture is hour-glass shaped.
Claim 5
Dependent Claim
36 words
The apparatus as set forth in claim 3 wherein there are two of said abutment surfaces and wherein said tapped hole extends into said body from said bed toward the intersection of the general planes thereof.
Claim 6
Dependent Claim
36 words
The apparatus as set forth in claim 1 wherein there are two of said abutment surfaces and wherein said tapped hole extends into said body from said bed toward the intersection of the general planes thereof.
Claim 7
Dependent Claim
19 words
The apparatus as set forth in claim 1 wherein said lower and upper sections are generally frusto-conical in shape.
Claim 8
Dependent Claim
21 words
The apparatus as set forth in claim 6 wherein said lower and upper sections are separated by a cylindrical central section.
Claim 9
Dependent Claim
62 words
The apparatus as set forth in claim 1 wherein, when said screw has been tightened with said upper and lower sections in engagement with said exposed portion of said aperture and said insert in tight abutment with said bed and locating surfaces, the axis of said tapped hole is displaced slightly from the axis of said screw to compensate for thread clearance.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |