US3905740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molding apparatus
Assignee: American National Bank and Trust Company of Chicago
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Filing: 1973-11-19
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Granted: 1975-09-16
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Expires: 1993-11-19
Abstract
Abstract An injection mold for making a polygonal plastic article having a closed bottom and an open top is disclosed. A first mold section corresponds to the exterior dimensions of the bottom wall and a portion of the contiguous side walls of the article while a second mold section composed of plural elements defines the interior surface of the article. Plural side wall elements are movable relative to both of the mold sections from an open position spaced from both sections to a closed position wherein the side wall members interlock with both mold sections to form the mold enclosure. Linkage elements interconnect various of the mold elements to provide a coordinated movement. Other features are disclosed.
Inventors
- 👤 Walter R Lovejoy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:32
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/40; B29C45/44; B29C45/4421; B29C45/26; B29C45/33; Y; Y10; Y10S; Y10S425/00; Y10S425/058
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
304 words
An injection mold for manufacture of a plastic article having plural side walls and only one closed end wall forming a generally polygonal enclosure with an open top, said mold comprising: first mold means having a mold defining surface corresponding to the exterior dimensions of said end wall and a first portion of the contiguous plural side walls of said article and further having first interlock means; core mold means comprising a plurality of relatively movable members cooperatively defining a mold core corresponding to the interior dimensions of said article; second mold means for supporting said core mold means and including second interlock means; side wall mold means disposed intermediate said first and second mold means and comprising plural separable side wall members movable between a closed position in which said plural members cooperatively form a mold defining surface corresponding to the exterior dimensions of a second portion of the contiguous plural side walls of said article and an open position in which said side wall members are displaced laterally and longitudinally of their closed position, the opposed end portions of said plural side wall members interfitting with respectively said first and second interlock means and the intermediate portions of said side wall members being spaced from both said first and second mold means when said side wall members are in their closed position for securely locating said side wall members against displacement under the influence of plastic injection pressures and said plural side wall members being spaced from each of said first and second interlock means and said first and second mold means when said side wall members are in their open position; and guide means comprising separate guide elements associated with each of said four side wall members for guiding movement of said side wall members between said closed and open positions.
Claim 2
Dependent Claim
304 words
An injection mold for manufacture of a plastic article having plural side walls and only one closed end wall forming a generally polygonal enclosure with an open top, said mold comprising: first mold means having a mold defining surface corresponding to the exterior dimensions of said end wall and a first portion of the contiguous plural side walls of said article and further having first interlock means; core mold means comprising a plurality of relatively movable members cooperatively defining a mold core corresponding to the interior dimensions of said article; second mold means for supporting said core mold means and including second interlock means; side wall mold means disposed intermediate said first and second mold means and comprising plural separable side wall members movable between a closed position in which said plural members cooperatively form a mold defining surface corresponding to the exterior dimensions of a second portion of the contiguous plural side walls of said article and an open position in which said side wall members are displaced laterally and longitudinally of their closed position, the opposed end portions of said plural side wall members interfitting with respectively said first and second interlock means and the intermediate portions of said side wall members being spaced from both said first and second mold means when said side wall members are in their closed position for securely locating said side wall members against displacement under the influence of plastic injection pressures and said plural side wall members being spaced from each of said first and second interlock means and said first and second mold means when said side wall members are in their open position; and guide means comprising separate guide elements associated with each of said four side wall members for guiding movement of said side wall members between said closed and open positions.
Claim 3
Dependent Claim
131 words
The injection mold of claim 1 in which said core mold means includes at least one member longitudinally movable along a path parallel to the longitudinal movement of said four side wall members and further comprising linkage means including separate linkage elements having first ends coupled respectively to said one member and each of said four side wall members and further including ejection plate means movable along a predetermined path and in which each of said separate linkage elements have second, opposite ends coupled to said ejection plate means and in which said linkage elements are constructed and arranged relative to one another for displacing said four side wall members and said one member of said core mold means at an equal longitudinal rate upon movement of said ejection plate means.
Claim 4
Dependent Claim
53 words
The injection mold of claim 2 in which said first and second interlock means comprisE respective recesses in said first and second mold means and in which respective opposite ends of said four side wall members seat in said recesses to interlock said side wall members with said first and second mold means.
Claim 5
Dependent Claim
51 words
The injection mold of claim 3 in which said core mold means comprises a central member of a generally trapezoidal cross-section having opposed side walls sloping inwardly toward one another and a pair of outer core members coupled to said central member for relative sliding movement along said sloped side walls.
Claim 6
Dependent Claim
68 words
The injection mold of claim 4 in which each of said outer core members is coupled to one end of a respective one of said separate linkage elements and the respective opposite ends of said linkage elements are coupled to said ejection plate means for displacing said outer core elements at the same longitudinal rate as said four side wall members upon displacement of said ejection plate means.
Claim 7
Dependent Claim
269 words
An injection mold for manufacture of a plastic article having four side walls and only one closed end wall forming a generally rectangular enclosure with an open top, said mold comprising: first mold means having a mold defining surface corresponding to the exterior dimensions of a predetermined portion of said article including said closed end wall; core mold means comprising a plurality of relatively movable members cooperatively defining in their closed position a mold core corresponding to the interior dimensions of said article, at least one of said plurality of members being displaceable along a predetermined path including both lateral and longitudinal components in moving between said closed position and an open position; second mold means for supporting said core mold means and being movable relative to said first mold means; side wall mold means comprising four separable side wall members movable between a closed position in which said four members cooperatively form a mold defining surface corresponding to the exterior dimensions of at least a portion of the contiguous four side walls of said article and an open position in which said side wall members are displaced laterally and longitudinally of their closed position; and ejection means comprising an ejection plate movable between a first and a second position and separate mechanical linkage elements coupled between said ejection plate and said one core mold member and said four side wall members, said linkage elements being constructed and arranged for displacing said one core mold member and said four side wall members at a like longitudinal rate with movement of said ejection plate between said first and second positions.
Claim 8
Dependent Claim
269 words
An injection mold for manufacture of a plastic article having four side walls and only one closed end wall forming a generally rectangular enclosure with an open top, said mold comprising: first mold means having a mold defining surface corresponding to the exterior dimensions of a predetermined portion of said article including said closed end wall; core mold means comprising a plurality of relatively movable members cooperatively defining in their closed position a mold core corresponding to the interior dimensions of said article, at least one of said plurality of members being displaceable along a predetermined path including both lateral and longitudinal components in moving between said closed position and an open position; second mold means for supporting said core mold means and being movable relative to said first mold means; side wall mold means comprising four separable side wall members movable between a closed position in which said four members cooperatively form a mold defining surface corresponding to the exterior dimensions of at least a portion of the contiguous four side walls of said article and an open position in which said side wall members are displaced laterally and longitudinally of their closed position; and ejection means comprising an ejection plate movable between a first and a second position and separate mechanical linkage elements coupled between said ejection plate and said one core mold member and said four side wall members, said linkage elements being constructed and arranged for displacing said one core mold member and said four side wall members at a like longitudinal rate with movement of said ejection plate between said first and second positions.
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) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |