US3573590A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Horizontal boring machine
Assignee: New Britain Machine Co
•
Filing: 1969-12-05
•
Granted: 1971-04-06
•
Expires: 1989-12-05
Abstract
Abstract A machine tool including a movable spindlehead member having an extensible and retractable tool spindle member, and a worksupporting compound slide assembly having two slide members movable in directions at right angles to one another. All members can be selectively ''''inched'''' and moved at feed and transverse rates in opposite directions along their respective paths of movement by two variable speed motors, one connectable to the spindlehead or the tool spindle and the other to either of the two slide members of the work-supporting compound slide. The motors are connected to their respective tool and work-moving members through discrete transmissions of the continuously meshed gear type under the control of hydraulically-actuated clutches. Spindle feed is alternatively provided from a spindle drive motor to correlate feed with rotation. Brake discs selectively deflectable against fixed abutments and connected to rotatable parts will maintain selected tool and work-carrying members in fixed positions.
Inventors
- 👤 John F Reed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:42
CPC Classifications
B; B23; B23Q; B23Q15/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
281 words
In a device of the character referred to a support structure, a member movable to one or more positions in or on said support structure, a reversible direct current electric motor operable from an alternating current power source for moving said member, a first electric tachometer driven by said motor for providing a first electric signal the polarity and amplitude of which are functions of the direction and speed of rotation of the motor, a manually-operated second electric tachometer for providing a second electric signal the polarity and amplitude of which are functions of its direction and speed of rotation, comparison means for comparing said first signal and said second signal and providing a difference electric signal proportion to difference in absolute amplitudes of said signals, controlled rectifier means connected to a power source and to said motor for supplying controllable amount of current to said motor, a firing gate control connected to the power source, and trigger means connected to said firing gate control means to said comparison means and to said controlled rectifier means, said trigger means comprising two sections respectively capable of providing electrical trigger pulses to said controlled rectifier means during positive and negative half-cycles of current supplied from the power source to cause conduction thereof during alternate half-cycles of current supplied from the power source of a polarity and at a time in each said half-cycle determined by the polarity and amplitude of said difference signal, said firing gate control providing electrical control signals to said trigger means to enable said trigger means to provide said trigger pulses to said controlled rectifier means only when said controlled rectifier means is in a condition to be conductive.
Claim 2
Dependent Claim
281 words
In a device of the character referred to a support structure, a member movable to one or more positions in or on said support structure, a reversible direct current electric motor operable from an alternating current power source for moving said member, a first electric tachometer driven by said motor for providing a first electric signal the polarity and amplitude of which are functions of the direction and speed of rotation of the motor, a manually-operated second electric tachometer for providing a second electric signal the polarity and amplitude of which are functions of its direction and speed of rotation, comparison means for comparing said first signal and said second signal and providing a difference electric signal proportion to difference in absolute amplitudes of said signals, controlled rectifier means connected to a power source and to said motor for supplying controllable amount of current to said motor, a firing gate control connected to the power source, and trigger means connected to said firing gate control means to said comparison means and to said controlled rectifier means, said trigger means comprising two sections respectively capable of providing electrical trigger pulses to said controlled rectifier means during positive and negative half-cycles of current supplied from the power source to cause conduction thereof during alternate half-cycles of current supplied from the power source of a polarity and at a time in each said half-cycle determined by the polarity and amplitude of said difference signal, said firing gate control providing electrical control signals to said trigger means to enable said trigger means to provide said trigger pulses to said controlled rectifier means only when said controlled rectifier means is in a condition to be conductive.
Claim 3
Dependent Claim
36 words
In a device as claimed in claim 1, wherein each section of the trigger means comprises a capacitor, charging means for charging said capacitor, and discharge means for discharging said capacitor to provide said trigger pulses.
Claim 4
Dependent Claim
36 words
In a device as claimed in claim 2, wherein each section further includes shorting means in parallel with said capacitor for preventing charging of said capacitor during alternate half-cycles of current supplied from the power source.
Claim 5
Dependent Claim
25 words
In a device as claimed in claim 3, wherein said charging means comprises a transistor whose degree of conduction is controlled by said difference signal.
Claim 6
Dependent Claim
23 words
In a device as claimed in claim 2, wherein said discharge means comprises a unijunction transistor having an emitter connected to said capacitor.
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) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |