US3729658A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circular rotary magnetic chuck for metal-working machines
Assignee: Individual
•
Filing: 1972-06-09
•
Granted: 1973-04-24
•
Expires: 1992-06-09
Abstract
Abstract In the chuck body adapted to rotate on the base, there are located electromagnets which, when the chuck rotates, get successively connected by the contact system to working voltage within the workpiece machining zone and to demagnetizing voltage within the workpiece unloading zone. The chuck contact system comprises the ring commutator held on the chuck body and current-carrying brushes adapted to interact therewith and fixed to the chuck bed at the boundaries of the zone, whereas cut into the circuit of the electromagnets are semiconductor diodes capable of admitting current to pass therethrough within the workpiece machining zone and not admitting it to flow within the workpiece loading zone.
Inventors
- 👤 I Voitov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:04
CPC Classifications
B; B23; B23Q; B23Q3/00; B23Q3/15; B23Q3/154; B23Q3/1543; B23Q3/152
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
169 words
A circular rotary magnetic chuck for metal-working machines, having the zones of loading, machining and unloading workpieces and comprising: a bed with ways; a body rotating along the ways of said bed; electromagnets arranged along the periphery of said body and interconnected in series; an adapter cover mounted on said body; a contact system which, when said body rotAtes, successively connects said electromagnets to working voltage within said workpiece machining zone for the workpieces to clamp on said chuck cover or to demagnetizing voltage within said workpiece unloading zone for the workpieces to be easily removed from the chuck; a ring commutator of said contact system held to said chuck body; current-carrying brushes of said contact system made fast on said chuck bed at the boundaries of said zones and adapted to interact with said ring commutator; semiconductor diodes connected into the circuit of said electromagnets so as to admit electric current to pass therethrough within said workpiece machining zone and restrict its flow within said workpiece loading zone.
Claim 2
Dependent Claim
169 words
A circular rotary magnetic chuck for metal-working machines, having the zones of loading, machining and unloading workpieces and comprising: a bed with ways; a body rotating along the ways of said bed; electromagnets arranged along the periphery of said body and interconnected in series; an adapter cover mounted on said body; a contact system which, when said body rotAtes, successively connects said electromagnets to working voltage within said workpiece machining zone for the workpieces to clamp on said chuck cover or to demagnetizing voltage within said workpiece unloading zone for the workpieces to be easily removed from the chuck; a ring commutator of said contact system held to said chuck body; current-carrying brushes of said contact system made fast on said chuck bed at the boundaries of said zones and adapted to interact with said ring commutator; semiconductor diodes connected into the circuit of said electromagnets so as to admit electric current to pass therethrough within said workpiece machining zone and restrict its flow within said workpiece loading zone.
Claim 3
Dependent Claim
99 words
A chuck as claimed in claim 1, wherein the commutator is assembled peripherally from a number of separate segments insulated from one another, each of which is connected to the terminals of two adjacent electromagnets, while the segments corresponding to the electromagnets wherebetween the semiconductor diodes are connected, are divided into two concentric bars which are insulated from each other and connected to the unlike poles of said diodes and are adapted to be bridged by a brush within the workpiece unloading zone to preclude gating effect of the diodes upon the flow of demagnetizing current through the electromagnets.
Claim 4
Dependent Claim
30 words
A chuck as claimed in claim 2, wherein the number of semiconductor diodes should be such that at least one of these be always found within the workpiece loading zone.
References Cited (Backward Citations)
US1484090A
Cited
US1544695A
Cited
US1628618A
Cited
US3219888A
Cited
US3209891A
Cited
US3340442A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |