US3660949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Work holder for irregular shaped workpieces
Assignee: Saint Gobain Abrasives Inc
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Filing: 1970-04-20
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Granted: 1972-05-09
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Expires: 1990-04-20
Abstract
Abstract A magnetic chuck having a fluidizable bed of ferromagnetic particles, energizable magnets to magnetize the particles, means to fluidize and demagnetize the particles, and to defluidize and magnetize the particles. Irregularly shaped ferrous and nonferrous foundry castings are easily partially embedded during fluidizing and demagnetizing of the bed and rigidly held in position upon defluidizing and magnetizing of the particles into a rigid mass about the casting. Thereby all portions of the casting can be worked upon by faster cutting and more powerfully fed cutting tools.
Inventors
- 👤 Loring Coes Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:12
CPC Classifications
B; B23; B23Q; B23Q3/00; B23Q3/02; B23Q3/06; B23Q3/08; B23Q3/15; B23Q3/154; B23Q3/1543; Y; Y10; Y10T; Y10T279/00; Y10T279/23
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
175 words
A magnetic chuck for holding workpieces of various shapes comprising: means including poles of opposite polarity for producing a magnetic field between the poles of opposite polarity; means for containing a bed of ferromagnetic particles in the magnetic field between the poles of opposite polarity; a bed of ferromagnetic particles contained within the containing means and the magnetic field and adapted to be immobilized into a rigid mass by the magnetic field induced between the poles of opposite polarity and into which the workpieces are partially imbedded and held by the immobilized rigid mass, and means operable for conveying a fluid under pressure iNto and through the bed of ferromagnetic particles, for cleaning, and fluidizing the bed of ferromagnetic particles. whereby undesirable foreign matter is expelled from the bed of ferromagnetic particles to prevent it from substantially changing the fluid flow and the strength of the magnetic field, and workpieces of various shapes are easily partially imbedded in the mobilized fluidized bed of ferromagnetic particles and rigidly held by the immobilized bed of ferromagnetic particles.
Claim 2
Dependent Claim
175 words
A magnetic chuck for holding workpieces of various shapes comprising: means including poles of opposite polarity for producing a magnetic field between the poles of opposite polarity; means for containing a bed of ferromagnetic particles in the magnetic field between the poles of opposite polarity; a bed of ferromagnetic particles contained within the containing means and the magnetic field and adapted to be immobilized into a rigid mass by the magnetic field induced between the poles of opposite polarity and into which the workpieces are partially imbedded and held by the immobilized rigid mass, and means operable for conveying a fluid under pressure iNto and through the bed of ferromagnetic particles, for cleaning, and fluidizing the bed of ferromagnetic particles. whereby undesirable foreign matter is expelled from the bed of ferromagnetic particles to prevent it from substantially changing the fluid flow and the strength of the magnetic field, and workpieces of various shapes are easily partially imbedded in the mobilized fluidized bed of ferromagnetic particles and rigidly held by the immobilized bed of ferromagnetic particles.
Claim 3
Dependent Claim
41 words
A magnetic chuck for holding workpieces of various shapes according to claim 1 wherein the means for producing a magnetic field comprises: a U-shaped magnet having, a chamber in between the poles of opposite polarity containing the bed of ferromagnetic particles.
Claim 4
Dependent Claim
90 words
A magnetic chuck for holding workpieces of various shapes according to claim 2 further comprising: a perforated plate supported within the chamber of the U-shaped magnet and separating the chamber into an upper chamber containing the ferromagnetic particles above the perforated plate and a lower chamber below the perforated plate through which the fluid under pressure is conveyed into the upper chamber and through the bed of ferromagnetic particles, the perforated plate having passages smaller than the smallest dimension of the ferromagnetic particles and interconnecting the upper and lower chambers.
Claim 5
Dependent Claim
42 words
A magnetic chuck for holding workpieces of various shapes according to claim 1 wherein the means for containing the ferromagnetic particles comprises: a container, including a chamber for the ferromagnetic particles, situated within the magnetic field between the poles of opposite polarity.
Claim 6
Dependent Claim
139 words
A magnetic chuck for holding workpieces of various shapes according to claim 4 wherein the container for the ferromagnetic particles situated within the magnetic field between the poles of opposite polarity comprises: a bottom wall an open top side opposite the bottom wall a sidewall extending peripherally around the container and upwardly from the bottom wall to the open top side a perforated wall, within the sidewall between bottom wall and the open top side, an upper chamber above the perforated wall and within which is situated the bed of ferromagnetic particles upon the perforated wall; a lower chamber below the perforated wall and into which the fluid under pressure is conveyed before passing through the perforated wall and the bed of ferromagnetic particles; and a plurality of passages in the perforated wall interconnecting the upper and lower chambers.
Claim 7
Dependent Claim
72 words
A magnetic chuck for holding workpieces of various shapes according to claim 5 wherein the means for conveying the fluid under pressure through the bed of ferromagnetic particles comprises: a conduit connected to the container and adapted to interconnect the lower chamber to a source of the fluid under pressure, and means, for stopping and starting the fluid under pressure flowing through the conduit, the chamber and the bed of ferromagnetic particles.
Claim 8
Dependent Claim
38 words
A magnetic chuck for holding workpieces of various shapes according to claim 6 wherein the means for producing a magnetic field comprises: an electro magnet; and means including an electrical circuit for energizing and de-energizing the electro magnet.
Claim 9
Dependent Claim
163 words
A magnetic chuck for holding workpieces of various shapes according to claim 7 wherein the means for stopping and starting the fluid under pressure flowing comprises: a solenoid operated valve connected into the conduit between the container and the source of the fluid under pressure; and wherein the means for energizing and de-energizing the electro magnet comprises: a selector switch connected to a source of electrical current in the electrical circuit, the selector switch operable upon moving it to one position to de-energize the electro magnet, remove the magnetic field, mobilize the bed of magnetic particles, energize the solenoid operated valve to allow the fluiD to flow through to clean and fluidize the bed of ferromagnetic particles, and the selector switch operable when moved to another position to de-energize the solenoid operated valve, to cut off the fluid flow which defluidizes the bed of ferromagnetic particles, and energizing the electro magnet, to produce the magnetic field and immobilize the bed of ferromagnetic particles.
Claim 10
Dependent Claim
36 words
A magnetic chuck for holding workpieces of various shapes according to claim 8 further comprising: an adjustable constant volume control valve connected into the conduit between the container and the source of the fluid under pressure.
Claim 11
Dependent Claim
37 words
A magnetic chuck for holding a workpiece of various shapes according to claim 9 further comprising: an adjustable constant pressure control valve connected into the conduit between the container and the source of the fluid under pressure.
Claim 12
Dependent Claim
40 words
A magnetic chuck for holding workpieces of various shapes according to claim 10 further comprising: an outer container within which are situated the electro magnet and the container containing the bed of ferromagnetic particles between the poles of opposite polarity.
Claim 13
Dependent Claim
36 words
A magnetic chuck for holding workpieces of various shapes according to claim 11 wherein the ferromagnetic particles are of substantially spherical shape and of substantially a uniform size larger than the passages in the perforated wall.
Claim 14
Dependent Claim
27 words
A magnetic chuck for holding workpieces of various shapes according to claim 12 wherein the electro magnet comprises: a U-shaped yoke; and wherein the containers are non-magnetic.
References Cited (Backward Citations)
US3341365A
Cited
US2770823A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |