US3857079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Machine tool utilizing a potentiometer for determining various positions
Assignee: Cincinnati Milacron Heald Corp
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Filing: 1973-03-09
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Granted: 1974-12-24
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Expires: 1993-03-09
Abstract
Abstract Machine tool in which movement of the table over the base is produced by a torque-controlled motor and in which the table positions are determined by means of a potentiometer and of preset resistance. At a pre-determined position, a stop element on the base engages a stop element on the table. During the engagement of these stop elements, the torque generated by the motor remains at a preselected value.
Inventors
- 👤 J Wake
- 👤 A Andre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:31
CPC Classifications
B; B23; B23Q; B23Q16/00; B23Q15/00; B23Q15/20; B23Q15/22; B23Q15/24
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
115 words
A machine tool, comprising a. a base, b. a table mounted for sliding movement on the base, c. an actuator operative between the base and the table, the torque and speed of the actuator being controllable, d. a primary potentiometer connected to the actuator, e. a plurality of secondary potentiometers set at selected values, f. a control for comparing signals from the secondary potentiometers with a signal from the primary potentiometers, and g. a stop element on the base engaging a stop element on the table at a point in the sliding movement, and h. means causing the torque generated by the actuator to remain at a pre-selected value during engagement between the stop elements.
Claim 2
Dependent Claim
115 words
A machine tool, comprising a. a base, b. a table mounted for sliding movement on the base, c. an actuator operative between the base and the table, the torque and speed of the actuator being controllable, d. a primary potentiometer connected to the actuator, e. a plurality of secondary potentiometers set at selected values, f. a control for comparing signals from the secondary potentiometers with a signal from the primary potentiometers, and g. a stop element on the base engaging a stop element on the table at a point in the sliding movement, and h. means causing the torque generated by the actuator to remain at a pre-selected value during engagement between the stop elements.
Claim 3
Dependent Claim
20 words
A machine tool as recited in claim 1, wherein the actuator is a ball-screw mechanism rotated by a torque-controlled motor.
Claim 4
Dependent Claim
24 words
A machine tool as recited in claim 1, wherein the primary potentiometer includes a helical resistance element and a contactor driven by the actuator.
Claim 5
Dependent Claim
33 words
A machine tool as recited in claim 1, wherein the secondary potentiometers are individually adjustable to give voltage settings corresponding to various locations in the sliding movement between the table and the base.
Claim 6
Dependent Claim
46 words
A machine tool as recited in claim 1, wherein one of the stop elements has a switch mounted for actuation by the other stop element, and wherein the switch is located so that it is actuated slightly before positive engagement takes place between the stop elements.
Claim 7
Dependent Claim
39 words
A machine tool as recited in claim 1, wherein a digital display mounted on the base gives a continuous indication of the condition of the primary potentiometer and, therefore, of the position of the table relative to the base.
Claim 8
Dependent Claim
32 words
A machine tool as recited in claim 6, wherein the secondary potentiometers are individually adjustable and each carries a display which is indicative of the value of the setting at all times.
Claim 9
Dependent Claim
39 words
A machine tool as recited in claim 7, wherein a coincidence of the value of the primary potentiometer with the setting on a secondary potentiometer serves to set in motion a change of mode of operation of the actuator.
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) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |