Patent US3889015A successfully refreshed from Google Patents.
US3889015A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating method with cleaning
Assignee: ELECTROSTATIC EQUIPMENT CORP
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Filing: 1972-05-24
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Granted: 1975-06-10
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Expires: 1992-05-24
Abstract
Abstract An apparatus and method are provided for producing a coating of resinous material upon only a portion of a workpiece, the resinous material preferably being deposited upon the workpiece as electrostatically charged solid particles. One zone of the workpiece is contacted, in the substantial absence of relative movement therebetween, with the cellular, resiliently deformable contact surface of a particle removal member to pick up particles of the resinous material therefrom without wiping or brushing the surface. Preferably, the resinous material is of such a nature that it can be fused to a unified coating, and the apparatus and method are particularly adapted for producing thermoplastic coatings upon armature rotors for electric motors.
Inventors
- 👤 William P English
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:46
CPC Classifications
B; B05; B05C; B05C19/00; B05C19/02; B05C19/025; B05B; B05B16/00; B05B16/90; B05B16/95; Y; Y10; Y10S; Y10S118/00; Y10S118/05
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
158 words
A METHOD FOR THE PRODUCTION OF A COATING OF RESINOUS MATERIAL UPON ONLY A PORTION OF A WORKPIECE, COMPRISING THE STEPS OF: A. PRODUCING A CLOUD OF ELECTROSTATICALLY CHARGED SOLID PARTICLES OF RESINOUS MATERIAL; B. EXPOSING SAID WORKPIECE TO SAID CHARGED PARTICLES WITH SAID WORKPIECE CHARGED EFFECTIVELY OPPOSITE THERETO TO CAUSE A LAYER OF PARTICLES TO DEPOSIT THEREON; C. THEREAFTER, CONTACTING A PARTICLE-COATED PORTION OF SAID WORKPIECE WITH A RELATIVELY RESILIENTLY DEFORMABLE CONTACT SURFACE HAVING A SMALL OPEN-CELL CONSTRUCTION, UNDER CONDITIONS AVOIDING RELATIVE MOVEMENT BETWEEN ELEMENTS OF SAID WORKPIECE PORTION AND OF SAID CONTACT SURFACE WHILE IN SUCH CONTACT, THEREBY LODGING PARTICLES FROM SAID COATED PORTION IN THE CELLS OF SAID CONTACT SURFACE WHILE AVOIDING SUBSTANTIAL WIPING ACTION BETWEEN SAID CONTACT SURFACE AND SAID WORKPIECE PORTION; AND D. THEREAFTER, SEPARATING SAID CONTACT SURFACE AND SAID WORKPIECE WITH SAID PARTICLES LODGED WITHIN THE CELLS OF SAID CONTACT SURFACE TO THEREBY EFFECT THE REMOVAL OF PARTICLES FROM SAID CONTACTED PORTION.
Claim 2
Independent Claim
158 words
A METHOD FOR THE PRODUCTION OF A COATING OF RESINOUS MATERIAL UPON ONLY A PORTION OF A WORKPIECE, COMPRISING THE STEPS OF: A. PRODUCING A CLOUD OF ELECTROSTATICALLY CHARGED SOLID PARTICLES OF RESINOUS MATERIAL; B. EXPOSING SAID WORKPIECE TO SAID CHARGED PARTICLES WITH SAID WORKPIECE CHARGED EFFECTIVELY OPPOSITE THERETO TO CAUSE A LAYER OF PARTICLES TO DEPOSIT THEREON; C. THEREAFTER, CONTACTING A PARTICLE-COATED PORTION OF SAID WORKPIECE WITH A RELATIVELY RESILIENTLY DEFORMABLE CONTACT SURFACE HAVING A SMALL OPEN-CELL CONSTRUCTION, UNDER CONDITIONS AVOIDING RELATIVE MOVEMENT BETWEEN ELEMENTS OF SAID WORKPIECE PORTION AND OF SAID CONTACT SURFACE WHILE IN SUCH CONTACT, THEREBY LODGING PARTICLES FROM SAID COATED PORTION IN THE CELLS OF SAID CONTACT SURFACE WHILE AVOIDING SUBSTANTIAL WIPING ACTION BETWEEN SAID CONTACT SURFACE AND SAID WORKPIECE PORTION; AND D. THEREAFTER, SEPARATING SAID CONTACT SURFACE AND SAID WORKPIECE WITH SAID PARTICLES LODGED WITHIN THE CELLS OF SAID CONTACT SURFACE TO THEREBY EFFECT THE REMOVAL OF PARTICLES FROM SAID CONTACTED PORTION.
Claim 3
Dependent Claim
31 words
The method of claim 1 wherein said workpiece is moved along a travel path during such contact with said contact surface, and wherein said contact surface is simultaneously moved adjacent thereto.
Claim 4
Dependent Claim
62 words
The method of claim 2 wherein said workpiece is a cylindrical article supported for free rotation reentrant its axis transversely across said travel path, and wherein contact by said contact surface is on a circumferential surface thereof and causes rotation of said article with said circumferential surface thereof moving at the same linear speed as that at which said contact surface moves.
Claim 5
Dependent Claim
62 words
The method of claim 3 wherein said article is an armature rotor for an electric machine having reentrant surface portions in the cylindrical core portion thereof defining winding slots therein, and wherein said contact element removes particles from the circumferential surface of said core portion without causing undue thinning or thickening of said layer of particles along the edges of said slots.
Claim 6
Dependent Claim
43 words
The method of claim 1 wherein said contact surface is comprised of an open-cell foam elastomer having a cell size of about 1 to 20 mils, and wherein said resinous material is a powder consisting essentially of particles smaller than about 80 mesh.
Claim 7
Dependent Claim
45 words
The method of claim 1 wherein said resinous material is fusible, and wherein said method includes the additional step of treating said particles of resinous material remaining on said workpiece subsequent to said particle removal step to cause at least partial fusion and coherence thereof.
Claim 8
Dependent Claim
27 words
The method of claim 6 wherein said resinous material is thermoplastic, and wherein said treating step is one of heating said particles to a temperature above ambient.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |