US3840313A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molding machine clamp force indicator
Assignee: Western Atlas Inc
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Filing: 1972-11-01
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Granted: 1974-10-08
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Expires: 1992-11-01
Abstract
Abstract A mechanism and method for predetermining 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 tire bars.
Inventors
- 👤 V Grundmann
- 👤 D Glazier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:17
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/1751; G; G01; G01L; G01L5/00; G01L5/0061; G01L5/0076
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
300 words
An inection molding machine comprising: a base member, a stationary platen carrying a mold half secured to said base member, a clamp housing member slidably supported on said base member for movement relative to said stationary platen, a movable platen carrying a mold half slidably supported on said base member, means connecting said clamp housing and movable platen operable to move said movable platen relative to said clamp housing member from a mold open position to a mold closed position, mold height adjusting means for moving said clamp housing and said movable platen as a unit relative to said stationary platen, said means comprising tie rods secured at one end to one of said platens and threaded at the other end thereof, passageways in said clamp housing and the other of said platens to slidably receive said tie bars, tie bar nuts engaging each threaded tie bar end, and tie bar nut drive means operable to rotate said tie bar nuts to vary the distance between said clamp housing and said stationary platen, a pointer on said clamp housing, indexable indicator means releasably locked to one of said tie bar nut drive means, means for releasing said indicator means for movement relative to said tie bar nut drive means to a reference position after said movable platen has been moved to a mold closed position and said clamp housing has ben moved to bring said mold halves into just touching contact, and means for operating said tie bar nut drive means in a direction to move said clamp housing toward said stationary platen after said movable platen has been moved to mold open position until said indicator has moved from said reference a predetermined number of degrees representing a desired clamping force when the mold is closed during injection cycles.
Claim 2
Dependent Claim
300 words
An inection molding machine comprising: a base member, a stationary platen carrying a mold half secured to said base member, a clamp housing member slidably supported on said base member for movement relative to said stationary platen, a movable platen carrying a mold half slidably supported on said base member, means connecting said clamp housing and movable platen operable to move said movable platen relative to said clamp housing member from a mold open position to a mold closed position, mold height adjusting means for moving said clamp housing and said movable platen as a unit relative to said stationary platen, said means comprising tie rods secured at one end to one of said platens and threaded at the other end thereof, passageways in said clamp housing and the other of said platens to slidably receive said tie bars, tie bar nuts engaging each threaded tie bar end, and tie bar nut drive means operable to rotate said tie bar nuts to vary the distance between said clamp housing and said stationary platen, a pointer on said clamp housing, indexable indicator means releasably locked to one of said tie bar nut drive means, means for releasing said indicator means for movement relative to said tie bar nut drive means to a reference position after said movable platen has been moved to a mold closed position and said clamp housing has ben moved to bring said mold halves into just touching contact, and means for operating said tie bar nut drive means in a direction to move said clamp housing toward said stationary platen after said movable platen has been moved to mold open position until said indicator has moved from said reference a predetermined number of degrees representing a desired clamping force when the mold is closed during injection cycles.
Claim 3
Dependent Claim
19 words
An injection molding machine as recited in claim 1, wherein said tie rods are secured to said stationary platen.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |