US4268003A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mold core and method and apparatus for manufacture
Assignee: Individual
•
Filing: 1979-08-14
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Granted: 1981-05-19
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Expires: 1999-08-14
Abstract
Abstract A precision injection-molded form for an inductance coil comprises a cylindrical core member having a surface of relatively low dimensional precision, and a thin plastic layer molded over the surface to provide a surface of high dimensional precision for supporting the windings of the coil. Metal insert-members having threaded axial bores and radially-extending wing portions are provided at either end of the core to establish electrical contact with the winding and a mounting capability for the assembly. The coil form is formed by injection molding techniques and apparatus which provide for axial compression of the assembly prior to molding to obtain a predetermined longitudinal dimension, and for equalization of forces exerted during molding to prevent longitudinal deformation.
Inventors
- 👤 James P. Liautaud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:49
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/14; B29C45/14639; B29C45/0025; Y; Y10; Y10S; Y10S425/00; Y10S425/01
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
157 words
The method of molding an elongated core member including an elongated bore-shaped recess in one end thereof and a solid elongated portion extending from the interior end of said recess such said interior end of said recess is subject to suck-in during post-molding cooling of the core member, said method comprising the steps of: forming an elongated mold cavity corresponding to the surface of the core member; positioning a mold core to extend into said cavity a distance substantially less than the length of said cavity to form the bore-shaped recess, a substantial length of said cavity beyond the end of said mold core remaining substantially open to form said elongated solid portion; providing at least one notch at the end of the mold core for forming a bridge portion fully across the interior end of the recess; injecting plastic into the cavity to form the core member removing the completed core member from the mold cavity.
Claim 2
Independent Claim
157 words
The method of molding an elongated core member including an elongated bore-shaped recess in one end thereof and a solid elongated portion extending from the interior end of said recess such said interior end of said recess is subject to suck-in during post-molding cooling of the core member, said method comprising the steps of: forming an elongated mold cavity corresponding to the surface of the core member; positioning a mold core to extend into said cavity a distance substantially less than the length of said cavity to form the bore-shaped recess, a substantial length of said cavity beyond the end of said mold core remaining substantially open to form said elongated solid portion; providing at least one notch at the end of the mold core for forming a bridge portion fully across the interior end of the recess; injecting plastic into the cavity to form the core member removing the completed core member from the mold cavity.
Claim 3
Dependent Claim
23 words
A method in accordance with claim 1 wherein said bridge portion is relatively thin upstanding tab extending between the sidewalls of said recess.
Claim 4
Dependent Claim
28 words
A method in accordance with claim 1 in which said mold cavity is generally cylindrical and said mold core is positioned along the axis of said mold cavity.
Claim 5
Dependent Claim
38 words
A method in accordance with claim 1 in which said mold core is generally cylindrical, and said notch extends diametrically across said mold core to form a bridge portion which extends diametrically across the end of the recess.
Claim 6
Dependent Claim
80 words
A one-piece molded plastic core member including: an elongated body portion comprising an elongated body portion comprising an elongated bore-shaped recess of substantially less extent than said body portion in one end thereof; a solid elongated portion of said body portion extending axially from the interior end of said recess; and means including a bridge portion extending fully across said recess at said interior end thereof for preventing suck-in at said interior end during post-molding cooling of the core member.
Claim 7
Dependent Claim
80 words
A one-piece molded plastic core member including: an elongated body portion comprising an elongated body portion comprising an elongated bore-shaped recess of substantially less extent than said body portion in one end thereof; a solid elongated portion of said body portion extending axially from the interior end of said recess; and means including a bridge portion extending fully across said recess at said interior end thereof for preventing suck-in at said interior end during post-molding cooling of the core member.
Claim 8
Dependent Claim
29 words
A core member in accordance with claim 5 in which said body portion is generally cylindrical and said bore-shaped recess extends along the axis of said cylindrical core member.
Claim 9
Dependent Claim
27 words
A core member in accordance with claim 5 in which said bore-shaped recess is cylindrical and said bridge portion extends diametrically across the end of said recess.
Claim 10
Dependent Claim
25 words
A core member in accordance with claim 5 wherein said bridge portion is a relatively thin upstanding tab extending between the sidewalls of said recess.
Claim 11
Dependent Claim
135 words
Apparatus for molding a core member having an elongated body portion and at least one elongated bore-shaped recess in one end thereof, said core member having an elongated solid, relatively slower-cooling central portion extending from the interior end of said recess, said apparatus comprising: a mold defining an elongated cavity corresponding to the body portion; a mold core extensible into said cavity a distance less than the length of said cavity to form the bore-shaped recess, a substantial length of said cavity beyond the end of said mold core being substantially open to form the central solid portion, and means including a notch in the end of said mold core for forming a bridge portion extending fully across the inside end of said recess to prevent suck-in upon post-molding cooling of said central solid portion.
Claim 12
Dependent Claim
135 words
Apparatus for molding a core member having an elongated body portion and at least one elongated bore-shaped recess in one end thereof, said core member having an elongated solid, relatively slower-cooling central portion extending from the interior end of said recess, said apparatus comprising: a mold defining an elongated cavity corresponding to the body portion; a mold core extensible into said cavity a distance less than the length of said cavity to form the bore-shaped recess, a substantial length of said cavity beyond the end of said mold core being substantially open to form the central solid portion, and means including a notch in the end of said mold core for forming a bridge portion extending fully across the inside end of said recess to prevent suck-in upon post-molding cooling of said central solid portion.
Claim 13
Dependent Claim
24 words
Apparatus in accordance with claim 9 wherein said notch is a relatively thin deep slot for forming a fast-cooling, relatively thin upstanding tab portion.
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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) | 1984-05-18 | 1984-11-17 | 1985-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-18 | 1988-11-17 | 1989-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-18 | 1992-11-17 | 1993-05-19 | $7700.00 | Window Closed / Lapsed |