US5380184A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection mold having a rotatable sprue member
Assignee: Individual
•
Filing: 1993-08-18
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Granted: 1995-01-10
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Expires: 2013-08-18
Abstract
Abstract An injection mold typically defines multiple cavities. A mold gate is provided which comprises a rotary spherical member having a sprue conduit extending transversely therethrough. Highly accurate sequential molding of multiple cavities can be achieved in this manner, as well as other advantages. Also, this arrangement permits a linear, straight sprue conduit which is free of any sharp turns.
Inventors
- 👤 John W. Von Holdt, Sr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:25
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/38; B29C45/26; B29C45/27; B29C45/2701; B29C45/32; B29C45/322
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
180 words
In an injection mold which defines a first mold part and a second mold part which together define a mold cavity between them; means for moving said mold parts between engaging, mold cavity-forming relation and spaced relation to alternatingly mold and to remove a product molded therein; and sprue means to provide molten molding compound to said mold cavity, the improvement comprising, in combination: said sprue means comprising a first sprue conduit communicating between a source of molten compound and a second sprue conduit, said second sprue conduit communicating between the first sprue conduit and the mold cavity, said second sprue conduit comprising a passageway extending centrally through a rotatable member; means for rotating said rotatable member between a first rotary position in which said passageway is in communication between the first sprue conduit and the mold cavity, and a second rotary position in which said passageway is out of said communication, said rotatable member being substantially spherical in shape; and plunger means for removing molding compound from said passageway while the rotatable member is in the second rotary position.
Claim 2
Dependent Claim
180 words
In an injection mold which defines a first mold part and a second mold part which together define a mold cavity between them; means for moving said mold parts between engaging, mold cavity-forming relation and spaced relation to alternatingly mold and to remove a product molded therein; and sprue means to provide molten molding compound to said mold cavity, the improvement comprising, in combination: said sprue means comprising a first sprue conduit communicating between a source of molten compound and a second sprue conduit, said second sprue conduit communicating between the first sprue conduit and the mold cavity, said second sprue conduit comprising a passageway extending centrally through a rotatable member; means for rotating said rotatable member between a first rotary position in which said passageway is in communication between the first sprue conduit and the mold cavity, and a second rotary position in which said passageway is out of said communication, said rotatable member being substantially spherical in shape; and plunger means for removing molding compound from said passageway while the rotatable member is in the second rotary position.
Claim 3
Dependent Claim
37 words
The injection mold of claim 1 in which said first and second sprue conduits communicate in the first rotary position with each other in essentially linear, straight relation, said sprue conduits being free of any sharp turns.
Claim 4
Dependent Claim
55 words
The injection mold of claim 2 in which means are provided for heating said rotatable member to retain molding compound in said passageway in molten condition, outer portions of said rotatable member comprising insulating material, whereby said rotatable member can rotate to present said insulating material to said mold cavity in the second rotary position.
Claim 5
Dependent Claim
167 words
An injection mold which defines a first mold part and a second mold part which together define a mold cavity between them; means for moving said mold parts between engaging, mold cavity-forming relation and spaced relation to alternatingly mold and to remove a product molded therein; and sprue means to provide molten molding compound to said mold cavity, said sprue means comprising a first sprue conduit communicating between a source of molten compound and a second sprue conduit, said second sprue conduit communicating between the first sprue conduit and the mold cavity, said second sprue conduit comprising a passageway extending centrally through a rotatable member; means for rotating said rotatable member between a first rotary position in which said passageway is in communication between the first sprue conduit and the mold cavity, and a second rotary position in which said passageway is out of said communication; and plunger means provided for removing molding compound from said passageway while the rotatable member is in the second rotary position.
Claim 6
Dependent Claim
167 words
An injection mold which defines a first mold part and a second mold part which together define a mold cavity between them; means for moving said mold parts between engaging, mold cavity-forming relation and spaced relation to alternatingly mold and to remove a product molded therein; and sprue means to provide molten molding compound to said mold cavity, said sprue means comprising a first sprue conduit communicating between a source of molten compound and a second sprue conduit, said second sprue conduit communicating between the first sprue conduit and the mold cavity, said second sprue conduit comprising a passageway extending centrally through a rotatable member; means for rotating said rotatable member between a first rotary position in which said passageway is in communication between the first sprue conduit and the mold cavity, and a second rotary position in which said passageway is out of said communication; and plunger means provided for removing molding compound from said passageway while the rotatable member is in the second rotary position.
Claim 7
Dependent Claim
37 words
The injection mold of claim 4 in which said first and second sprue conduits, in the first rotary position, communicate with each other in essentially linear, straight relation, said sprue conduits being free of any sharp turns.
Claim 8
Dependent Claim
55 words
The injection mold of claim 5 in which means are provided for heating said rotatable member to retain molding compound in said passageway in molten condition, outer portions of said rotatable member comprising insulating material, whereby said rotatable member can rotate to present said insulating material to said mold cavity in the second rotary position.
Claim 9
Dependent Claim
16 words
The injection mold of claim 6 in which said rotatable member is substantially spherical in shape.
Claim 10
Dependent Claim
55 words
The injection mold of claim 4 in which means are provided for heating said rotatable member to retain molding compound in said passageway in molten condition, outer portions of said rotatable member comprising insulating material, whereby said rotatable member can rotate to present said insulating material to said mold cavity in the second rotary position.
Claim 11
Dependent Claim
16 words
The injection mold of claim 8 in which said rotatable member is substantially spherical in shape.
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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) | 1998-01-09 | 1998-07-11 | 1999-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-09 | 2002-07-11 | 2003-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-01-09 | 2006-07-11 | 2007-01-10 | $7700.00 | Window Closed / Lapsed |