US4516927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pointed heat-generating device for molds of injection molding machines
Assignee: Seiki KK
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Filing: 1981-06-19
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Granted: 1985-05-14
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Expires: 2001-06-19
Abstract
Abstract This invention relates to a pointed heat-generating device for molds of injection molding machines. It comprises a metal casing, a pointed projectile heat-generating means fixed with the metal casing, and a gate formed at the pointed heat-generating means and communicated to a cavity of the molds, characterized in that a heat-generating wire is penetrated wholly into a passage which is bored in a non-processed cylindrical material and an alloy portion is formed in an inert gas between an end of the heat-generating wire and the non-processed cylindrical material, thereby the alloy portion being formed as a pointed part of the heat-generating means by machining.
Inventors
- 👤 Yoshiichi Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:11
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/10; B; B29; B29C; B29C45/00; B29C45/17; B29C45/26; B29C45/27; B29C45/30
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
130 words
An improved pointed heat-generating device for molds of injection molding machines comprising a metal casing, a pointed projectile heat-generating means fixed with an end of the metal casing, a gate formed at the pointed heat-generating means and communicated to a cavity of the molds, and a synthetic resin material being fused or cooled or solidified at the gate by an electric ON-OFF switching of the pointed heat-generating means, thereby the gate being opened or closed intermittently, wherein the improvement comprises an alloy portion formed by fusing of an end of a heat-generating wire penetrated wholly into a passage which is bored in a non-processed cylindrical material, with the non-processed cylindrical material, and thereby the alloy portion can be shaped as a pointed part of the heat generating means by machining.
Claim 2
Dependent Claim
130 words
An improved pointed heat-generating device for molds of injection molding machines comprising a metal casing, a pointed projectile heat-generating means fixed with an end of the metal casing, a gate formed at the pointed heat-generating means and communicated to a cavity of the molds, and a synthetic resin material being fused or cooled or solidified at the gate by an electric ON-OFF switching of the pointed heat-generating means, thereby the gate being opened or closed intermittently, wherein the improvement comprises an alloy portion formed by fusing of an end of a heat-generating wire penetrated wholly into a passage which is bored in a non-processed cylindrical material, with the non-processed cylindrical material, and thereby the alloy portion can be shaped as a pointed part of the heat generating means by machining.
Claim 3
Dependent Claim
59 words
A pointed heat-generating device for molds of injection molding machines as claimed in claim 1, in which the heat-generating wire integrally united to the alloy portion passes through the inside of the metal casing and is connected to a lead wire, thereby the pointed heat-generating means can to be energized by a power source connected to the lead wire.
Claim 4
Dependent Claim
52 words
A pointed heat-generating device for molds of injection molding machines as claimed in claim 1, in which the heat-generating wire connected to the pointed heat-generating means is, on its outer circumference, wound by a second heat-generating wire in order to heat and fuse synthetic resin upon a surface of the metal casing.
Claim 5
Dependent Claim
52 words
A pointed heat-generating device for molds of injection molding machines as claimed in claim 1, in which the metal casing is provided with a pair of supply paths for supplying synthetic resin, the pair of supply paths being mounted in parallel with each other to an axial direction of the metal casing.
Claim 6
Dependent Claim
81 words
A pointed heat-generating device for molds of injection molding machines as claimed in claim 1, in which the metal casing is provided with a stage adjacent a base of the metal casing, the stage being provided with a pair of slit grooves at its upper and lower side in order to ease a cooling effect of a mold cooling water, while the winding number of the second heat-generating wire is increased in the proximity of the stage for the same purpose.
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) | 1988-05-13 | 1988-11-12 | 1989-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-13 | 1992-11-12 | 1993-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-13 | 1996-11-12 | 1997-05-14 | $7700.00 | Window Closed / Lapsed |