Patent US3877180A successfully refreshed from Google Patents.
US3877180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drive systems for a grinding wheel
Assignee: Carnegie Mellon University
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Filing: 1973-11-12
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Granted: 1975-04-15
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Expires: 1993-11-12
Abstract
Abstract A system for driving a grinding wheel and urging it against a work piece employs two hydraulic systems linked together. One system drives the grinding wheel and applies a torque to it while building a fluid pressure proportional to the torque. The second system includes a set (or reference) fluid pressure which urges the grinding wheel into the work. The two hydraulic systems are linked together in such a manner that when the pressure in the hydraulic system which drives the grinding wheel equalizes the set pressure in the hydraulic system which urges the grinding wheel against the work, the entire system is in equilibrium and maintains a constant torque at the grinding wheel. If excess pressure guilds up in the hydraulic system which drives the grinding wheel, it will counteract the set pressure in the second hydraulic system and cause the grinding wheel to back away from the work in order to maintain the constant torque.
Inventors
- 👤 James N Brecker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:28
CPC Classifications
B; B24; B24B; B24B49/00; B24B49/16
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
136 words
A system for driving a grinding wheel and urging it against a work piece which comprises: a. a first hydraulic means driving the grinding wheel and applying a torque to the grinding wheel, the first hydraulic means developes a dynamic pressure in fluid supply in the first hydraulic means which is used to transmit the torque to the grinding wheel; and b. a second hydraulic means urges the grinding wheel into the work and is fluid coupled to the first hydraulic means, the second hydraulic means is continuously responsive to changes in the dynamic pressure of the fluid supply in the first hydraulic means and the pressure applied by the second hydraulic means, in urging the wheel against the work, continuously varies according to the dynamic pressure in the fluid supply in the first hydraulic means.
Claim 2
Independent Claim
136 words
A system for driving a grinding wheel and urging it against a work piece which comprises: a. a first hydraulic means driving the grinding wheel and applying a torque to the grinding wheel, the first hydraulic means developes a dynamic pressure in fluid supply in the first hydraulic means which is used to transmit the torque to the grinding wheel; and b. a second hydraulic means urges the grinding wheel into the work and is fluid coupled to the first hydraulic means, the second hydraulic means is continuously responsive to changes in the dynamic pressure of the fluid supply in the first hydraulic means and the pressure applied by the second hydraulic means, in urging the wheel against the work, continuously varies according to the dynamic pressure in the fluid supply in the first hydraulic means.
Claim 3
Dependent Claim
80 words
A system as recited in claim 1 wherein the second hydraulic means includes a third hydraulic means supplying a set fluid pressure to the grinding wheel to urge it against the work, the grinding wheel is urged against the work until the dynamic pressure in the fluid supply in the first hydraulic means counteracts the set pressure and reaches an equiliBrium while the grinding wheel is removing material from the work thereby maintaining a constant torque at the grinding wheel.
Claim 4
Dependent Claim
77 words
A system as recited in claim 2 wherein the second hydraulic means includes an hydraulic piston and cylinder in which the cylinder is coupled to the grinding wheel and urges the grinding wheel into and away from the work, the set pressure in the fluid from the third hydraulic means is coupled to a forcing end of the cylinder and the fluid pressure from the first hydraulic means is coupled to an end opposite the forcing end.
Claim 5
Dependent Claim
48 words
A system as recited in claim 3 wherein the first hydraulic means includes: a. an electric motor; b. an hydraulic pump coupled to the electric motor; and c. an hydraulic motor with a fluid coupling to the hydraulic pump, the hydraulic motor is coupled to the grinding wheel.
Claim 6
Dependent Claim
34 words
A system as recited in claim 4 which includes a fourth means coupling the fluid coupling between the hydraulic pump and the hydraulic motor to the cylinder at the end opposite the forcing end.
Claim 7
Dependent Claim
19 words
A system as recited in claim 5 wherein the fourth means includes a safety valve and a positioning valve.
References Cited (Backward Citations)
US2114349A
Cited
US2961808A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |