US3734664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solenoid operated door opener for plastic molding machines
Assignee: Package Machinery Co
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Filing: 1971-10-19
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Granted: 1973-05-22
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Expires: 1991-10-19
Abstract
Abstract An automatically operable device for opening the sliding safety gate or door of a plastic injection molding machine whenever the die or mold halves of the machine are opened so that the machine operator can have ready access to the area between the mold halves.
Inventors
- 👤 W Bosyk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:50
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/84
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
168 words
In a plastic injection molding machine of the type having a pair of mold or die platens which are relatively movable between mold open and mold closed positions and a normally manually operable door movable between open and closed positions adjacent the die platens respectively to permit and to prevent operator access to the die platen area, the improvement comprising a plunger carried by a movable die platen and which is movable between a normal retracted position and an extended position wherein it will engage said door in its closed position to open it, a plunger operator including a spring urging the plunger to one of its said positions and a solenoid which when energized moves the plunger to the other of its said positions, and an electrical control for said plunger operator including switch means operable responsive to movement of the said movable die platen to cause said plunger to be extended only when said platens are moved relatively from mold closed position toward mold open position.
Claim 2
Dependent Claim
168 words
In a plastic injection molding machine of the type having a pair of mold or die platens which are relatively movable between mold open and mold closed positions and a normally manually operable door movable between open and closed positions adjacent the die platens respectively to permit and to prevent operator access to the die platen area, the improvement comprising a plunger carried by a movable die platen and which is movable between a normal retracted position and an extended position wherein it will engage said door in its closed position to open it, a plunger operator including a spring urging the plunger to one of its said positions and a solenoid which when energized moves the plunger to the other of its said positions, and an electrical control for said plunger operator including switch means operable responsive to movement of the said movable die platen to cause said plunger to be extended only when said platens are moved relatively from mold closed position toward mold open position.
Claim 3
Dependent Claim
167 words
In a plastic injection molding machine of the type having a pair of mold or die platens which are relatively movable between mold open and mold closed positions and a normally manually operable door movable between open and closed positions adjacent the die platens respectively to permit and to prevent operator access to the die platen area, the improvement comprising a plunger carried by a movable die platen and which is movable between a normal retracted position and an extended position wherein it will engage said door in its closed position to open it, a plunger operator including a spring urging the plunger to retracted position and a solenoid which when enerGized moves the plunger to its extended position, and an electrical control for said plunger operator including switch means operable responsive to movement of the said movable die platen to energize said solenoid when said platens are moved relatively from mold closed position and to de-energize said solenoid in the mold open position of said platens.
Claim 4
Dependent Claim
167 words
In a plastic injection molding machine of the type having a pair of mold or die platens which are relatively movable between mold open and mold closed positions and a normally manually operable door movable between open and closed positions adjacent the die platens respectively to permit and to prevent operator access to the die platen area, the improvement comprising a plunger carried by a movable die platen and which is movable between a normal retracted position and an extended position wherein it will engage said door in its closed position to open it, a plunger operator including a spring urging the plunger to retracted position and a solenoid which when enerGized moves the plunger to its extended position, and an electrical control for said plunger operator including switch means operable responsive to movement of the said movable die platen to energize said solenoid when said platens are moved relatively from mold closed position and to de-energize said solenoid in the mold open position of said platens.
Claim 5
Dependent Claim
74 words
The improvement set forth in claim 2 in a molding machine wherein the door is slidable between open and closed positions substantially parallel to the path of relative movement between the die platens, and a strike block is mounted on said door for engagement by said plunger only when it is extended and then only on one side of said block to effect only opening sliding movement of said door by said extended plunger.
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) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |