US3897680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for predetermining clamp force in molding machines
Assignee: Western Atlas Inc
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Filing: 1974-07-01
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Granted: 1975-08-05
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Expires: 1994-07-01
Abstract
Abstract A method for predeterming the force imposed upon the mold in an injection-molding machine. The force applied to the mold in compression is equal to the tension force on the tie bars and produces a predictable elongation. By setting the mold height adjustment to a predetermined quantity slightly less than the true mold height, the operator predetermines the force applied to the mold. The increment of mold height adjustment from true mold height is selected by an indicator which includes a graduated circular plate which rotates with a tie bar nut adjacent to a stationary pointer. The angular displacement of the associated tie bar nut is a function of the desired predetermined force on the tie bars.
Inventors
- 👤 Volker P Grundmann
- 👤 Sr Douglas C Glazier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:14
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/1751; G; G01; G01L; G01L5/00; G01L5/0061; G01L5/0076
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
158 words
The method of predetermining the clamp force of an injectionmolding machine having a clamp housing member, a reciprocable compression mechanism for clamping a mold and a mold height adjustment which comprises: a. adjusting the mold height so that mold halves do not touch if the compression mechanism is extended; b. extending the compression mechanism to its maximum travel; c. decreasing the mold height adjustment until the mold halves are in contact to define a reference point; d. setting an indexable indicator to said reference point; e. retracting the compression mechanism; f. moving the clamp housing member and said indicator from the reference point in a direction which increases clamp force until an index point on said indicator is reached representing the elongation of the tie bars which will result from applying the desired predetermined force to the mold when the compression mechanism is closed; and g. closing the compression mechanism on the mold preparatory to an injection cycle.
Claim 2
Independent Claim
158 words
The method of predetermining the clamp force of an injectionmolding machine having a clamp housing member, a reciprocable compression mechanism for clamping a mold and a mold height adjustment which comprises: a. adjusting the mold height so that mold halves do not touch if the compression mechanism is extended; b. extending the compression mechanism to its maximum travel; c. decreasing the mold height adjustment until the mold halves are in contact to define a reference point; d. setting an indexable indicator to said reference point; e. retracting the compression mechanism; f. moving the clamp housing member and said indicator from the reference point in a direction which increases clamp force until an index point on said indicator is reached representing the elongation of the tie bars which will result from applying the desired predetermined force to the mold when the compression mechanism is closed; and g. closing the compression mechanism on the mold preparatory to an injection cycle.
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) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |