US3842543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grinding machine
Assignee: Heald Machine Co
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Filing: 1972-04-13
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Granted: 1974-10-22
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Expires: 1992-04-13
Abstract
Abstract This invention relates to a grinding machine, and more particularly, to a machine for forming annular surfaces of revolution of irregular form.
Inventors
- 👤 F Hohler
- 👤 E Wlodyka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:16
CPC Classifications
B; B24; B24B; B24B5/00; B24B5/18; B24B5/26; B24B47/00; B24B47/20; B24B5/185
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
249 words
A grinding machine, comprising a. a workhead for holding and rotating a workpiece having a portion which is to be formed with a surface of revolution of non-cylindrical form, b. a wheelhead for holding and rotating a first abrasive wheel having a surface of the same non-cylindrical form and a second abrasive wheel, the two wheels being in axially spaced relationship, the surface of the second abrasive wheel duplicating a special portion of the surface of the first abrasive wheel, which portion is to be finished with a better quality than the remainder, c. feed means to move the workhead and wheelhead relative to one another to introduce the abrasive wheel to the workpiece for a plunge grind with a predetermined controlled force, d. a dresser having an operative surface of the same noncylindrical form located adjacent the workhead and wheelhead, the dresser being provided with a wheel having a surface of revolution of non-cylindrical form similar to that of the wheel, the wheel being rotatably driven about the major axis of the surface of revolution, the wheel consisting of a matrix in which are embedded a number of diamonds, e. a second dresser axially spaced from the first abovementioned dresser for dressing the second abrasive wheel, and f. means serving to introduce the rotating abrasive wheel to the dresser while rotating the dresser in the opposite direction to tHat of the wheel for restoring the abrasive wheel accurately to the said non-cylindrical form after the said plunge grind.
Claim 2
Dependent Claim
249 words
A grinding machine, comprising a. a workhead for holding and rotating a workpiece having a portion which is to be formed with a surface of revolution of non-cylindrical form, b. a wheelhead for holding and rotating a first abrasive wheel having a surface of the same non-cylindrical form and a second abrasive wheel, the two wheels being in axially spaced relationship, the surface of the second abrasive wheel duplicating a special portion of the surface of the first abrasive wheel, which portion is to be finished with a better quality than the remainder, c. feed means to move the workhead and wheelhead relative to one another to introduce the abrasive wheel to the workpiece for a plunge grind with a predetermined controlled force, d. a dresser having an operative surface of the same noncylindrical form located adjacent the workhead and wheelhead, the dresser being provided with a wheel having a surface of revolution of non-cylindrical form similar to that of the wheel, the wheel being rotatably driven about the major axis of the surface of revolution, the wheel consisting of a matrix in which are embedded a number of diamonds, e. a second dresser axially spaced from the first abovementioned dresser for dressing the second abrasive wheel, and f. means serving to introduce the rotating abrasive wheel to the dresser while rotating the dresser in the opposite direction to tHat of the wheel for restoring the abrasive wheel accurately to the said non-cylindrical form after the said plunge grind.
Claim 3
Dependent Claim
49 words
A grinding machine as recited in claim 1, wherein the wheelhead has a spindle on which the said abrasive wheel is mounted, wherein the first wheel consists of a plurality of individual wheels mounted close together, including a large annular ball track wheel between two thin seal groove wheels.
Claim 4
Dependent Claim
81 words
A grinding machine as recited in claim 1, wherein the surface of the workpiece to be finished is an internal surface of revolution, wherein the workhead is provided with a platen which contacts a radial surface of the workpiece for driving the same, wherein the spindle is supported at one end only by the wheelhead, and wherein the platen is provided with a large axial recess to receive one of the abrasive wheels while the other is operating on the workpiece.
Claim 5
Dependent Claim
46 words
A grinding machine as recited in claim 3, wherein the second abrasive wheel is located on the spindle at a position occupied by the first abrasive wheel and wherein it is the said first abrasive wheel which resides on occasion in the recess in the platen.
Claim 6
Dependent Claim
39 words
A grinding machine as recited in claim 4, wherein the said second dresser is a radius dresser and wherein the two dressers are mounted side-by-side and are individually retractable away from the path of longitudinal movement of the wheels.
Claim 7
Dependent Claim
52 words
A grinding machine as recited in claim 5, wherein a substantial portion of the first abrasive wheel is a portion of an annulus of circular cross-section for rough forming a ball track on a ball bearing race and the second abrasive wheel is of the same shape for finishing the ball track.
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) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |