US3828481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cam controlled machine for grinding a non-circular surface
Assignee: Cincinnati Milacron Heald Corp
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Filing: 1973-05-23
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Granted: 1974-08-13
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Expires: 1993-05-23
Abstract
Abstract A grinding machine for forming a non-circular surface on a workpiece, the machine having means for preventing misformation of the surface due to lack of normalcy between a master cam and its cam follower.
Inventors
- 👤 H Uhtenwoldt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:16
CPC Classifications
B; B24; B24B; B24B17/00; B24B17/08; B23; B23Q; B23Q35/00; B23Q35/04; B23Q35/08; B23Q35/10; B23Q35/101; B23Q35/102; B23Q35/103; B23Q35/105; B24B19/00; B24B19/08; B24B19/09; B24B19/095; Y; Y10; Y10S; Y10S451/00; Y10S451/92; Y10T; Y10T409/00; Y10T409/30; Y10T409/30084
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
191 words
A grinding machine for forming a non-circular surface on a workpiece, comprising a. a base having a plane surface, b. a table mounted on the said surface of the base for sliding movement in any direction in that plane, c. a workhead rotatably located in the table for supporting and rotating the workpiece, d. a master cam mounted on the workhead and having a surface representative of the said surface to be formed, e. a wheelhead mounted on the base for operative movement relative to the workhead and having an abrasive wheel for generating the said surface, f. a cam follower for engaging the said surface of the master cam, g. means joining the cam follower to the base to cause the workpiece to move in the approximate path of the said surface of the master cam, and h. a spring associated with the cam follower to press it against the surface of the master cam, and i. a secondary cam to change the spring deflection as the workhead rotates to cause the force between the cam follower and the master cam to remain constant during the rotation of the workhead.
Claim 2
Dependent Claim
191 words
A grinding machine for forming a non-circular surface on a workpiece, comprising a. a base having a plane surface, b. a table mounted on the said surface of the base for sliding movement in any direction in that plane, c. a workhead rotatably located in the table for supporting and rotating the workpiece, d. a master cam mounted on the workhead and having a surface representative of the said surface to be formed, e. a wheelhead mounted on the base for operative movement relative to the workhead and having an abrasive wheel for generating the said surface, f. a cam follower for engaging the said surface of the master cam, g. means joining the cam follower to the base to cause the workpiece to move in the approximate path of the said surface of the master cam, and h. a spring associated with the cam follower to press it against the surface of the master cam, and i. a secondary cam to change the spring deflection as the workhead rotates to cause the force between the cam follower and the master cam to remain constant during the rotation of the workhead.
Claim 3
Dependent Claim
65 words
A grinding machine as recited in claim 1, wherein a linK joins the base to the table to correct variation in normalcy during the rotation of the workhead, wherein the workhead is provided with a gear concentric with an axis through the center of rotation thereof, and wherein the table is provided with a motor driving a worm which in turn drives the workhead gear.
Claim 4
Dependent Claim
33 words
A grinding machine as recited in claim 2, wherein the link is attached to the table at a point spaced from the line of contact of the cam follower and the master cam.
Claim 5
Dependent Claim
33 words
A grinding machine as recited in claim 3, wherein the length of the link is adjustable by virtue of an extensible hydraulic cylinder controlled by a master cylinder operated by a compensation cam.
Claim 6
Dependent Claim
34 words
A grinding machine as recited in claim 4, wherein a tertiary cam driven by the worm gear operates a hydraulic cylinder which is connected by hydraulic lines to operate the cylinder in the link.
Claim 7
Dependent Claim
62 words
A grinding machine as recited in claim 1, wherein the base is provided with a pivot shaft that extends into the table and provides for the rotation of the table about an axis passing through the point of contact of the cam follower with the master cam, and wherein the shaft is provided with a bore in which the spring is mounted.
Claim 8
Dependent Claim
63 words
A grinding machine as recited in claim 6, wherein the spring is a rod having at one end a roller for engaging the secondary cam and being mounted at the other end in a block which is pivotally mounted in the bore in the shaft, and wherein screw means is provided for locking the block at a selected aspect angle in the bore.
Claim 9
Dependent Claim
30 words
A grinding machine as recited in claim 7, wherein the rod extends through the cam follower and the cam follower is rotatably mounted on the intermediate portion of the rod.
Claim 10
Dependent Claim
18 words
A grinding machine as recited in claim 1, wherein means is provided for obtaining constant work surface velocity.
Claim 11
Dependent Claim
39 words
A grinding machine as recited in claim 2, wherein the worm not only drives a workhead worm gear but also a compensation cam worm gear, the single worm and double worm gears being arranged to balance their reaction forces.
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) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |