US3761215A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mold press
Assignee: Individual
•
Filing: 1970-11-18
•
Granted: 1973-09-25
•
Expires: 1990-11-18
Abstract
Abstract An apparatus for molding plastics is provided with an elastic member adapted to press a mold top against a mold bottom and with a tie-rod assembly adapted to alternately move the elastic member from the mold top and to position it over the mold bottom without change in the pressure exerted by the elastic member against the mold top.
Inventors
- 👤 C Tondato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:28
CPC Classifications
B; B29; B29C; B29C43/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
137 words
An apparatus for molding plastics comprising a die having a cavitated base and a lid separable therefrom, means for pressing the lid against the base comprising a spring compressed between the lid and a rigid back-up plate spaced above the lid, and means for lifting the lid from the base and for compressing the spring comprising a pair of tie rods secured at one end to the lid and at the other end to a cross-bar above the spring, a hydraulic cylinder having a piston therein and a piston rod secured to the cross-bar, means for charging fluid under pressure into the cylinder to actuate the piston and to lift the cross-bar, and means for releasing the fluid from the cylinder, whereby upon the said release of fluid the compressed spring presses the lid against the base.
Claim 2
Independent Claim
137 words
An apparatus for molding plastics comprising a die having a cavitated base and a lid separable therefrom, means for pressing the lid against the base comprising a spring compressed between the lid and a rigid back-up plate spaced above the lid, and means for lifting the lid from the base and for compressing the spring comprising a pair of tie rods secured at one end to the lid and at the other end to a cross-bar above the spring, a hydraulic cylinder having a piston therein and a piston rod secured to the cross-bar, means for charging fluid under pressure into the cylinder to actuate the piston and to lift the cross-bar, and means for releasing the fluid from the cylinder, whereby upon the said release of fluid the compressed spring presses the lid against the base.
Claim 3
Independent Claim
160 words
An apparatus for molding plastics comprising a die having a cavitated base and a lid separable therefrom, means for pressing the lid against the base comprising a separable plate disposed on the lid and a spring compressed between the plate and a rigid back-up plate spaced above the separable plate and means for lifting the plate from the lid and for releasing the spring''s pressure from the lid comprising a pair of tie rods secured at one end to the separable plate and at the other end to a cross-bar disposed above the spring, a hydraulic cylinder having a piston therein and a piston rod secured to the cross-bar, means for charging fluid under pressure into the cylinder to actuate the piston and to lift the cross-bar, and means for releasing the fluid from the cylinder, whereby upon the said release of fluid the compressed spring presses the separable plate against the lid and presses the lid against the base.
Claim 4
Independent Claim
160 words
An apparatus for molding plastics comprising a die having a cavitated base and a lid separable therefrom, means for pressing the lid against the base comprising a separable plate disposed on the lid and a spring compressed between the plate and a rigid back-up plate spaced above the separable plate and means for lifting the plate from the lid and for releasing the spring''s pressure from the lid comprising a pair of tie rods secured at one end to the separable plate and at the other end to a cross-bar disposed above the spring, a hydraulic cylinder having a piston therein and a piston rod secured to the cross-bar, means for charging fluid under pressure into the cylinder to actuate the piston and to lift the cross-bar, and means for releasing the fluid from the cylinder, whereby upon the said release of fluid the compressed spring presses the separable plate against the lid and presses the lid against the base.
Claim 5
Independent Claim
90 words
An apparatus for molding plastics comprising a die having a cavitated base and a lid separable therefrom, means for pressing the lid against the base comprising a spring, and means for compressing the spring and thereby release the lid comprising a hydraulic cylinder having a piston therein, means for charging fluid under pressure into the cylinder to actuate the piston and compress the spring, and means for releasing the fluid from the cylinder whereby upon release of the fluid the spring is released and presses the lid against the base.
Claim 6
Independent Claim
90 words
An apparatus for molding plastics comprising a die having a cavitated base and a lid separable therefrom, means for pressing the lid against the base comprising a spring, and means for compressing the spring and thereby release the lid comprising a hydraulic cylinder having a piston therein, means for charging fluid under pressure into the cylinder to actuate the piston and compress the spring, and means for releasing the fluid from the cylinder whereby upon release of the fluid the spring is released and presses the lid against the base.
Claim 7
Independent Claim
112 words
An apparatus for molding plastics comprising a die having a cavitated base and a lid separable therefrom, means for pressing the lid against the base comprising a spring, and means for lifting the lid from the base and for compressing the spring comprising a pair of tie-rods secured at one end to the lid, a hydraulic cylinder having a piston therein and a piston rod secured to the tie-rods, means for charging fluid under pressure into the cylinder to actuate the piston and to lift the tie-rods, and means for releasing the fluid from the cylinder, whereby upon the release of the fluid the compressed spring presses the lid against the base.
Claim 8
Independent Claim
112 words
An apparatus for molding plastics comprising a die having a cavitated base and a lid separable therefrom, means for pressing the lid against the base comprising a spring, and means for lifting the lid from the base and for compressing the spring comprising a pair of tie-rods secured at one end to the lid, a hydraulic cylinder having a piston therein and a piston rod secured to the tie-rods, means for charging fluid under pressure into the cylinder to actuate the piston and to lift the tie-rods, and means for releasing the fluid from the cylinder, whereby upon the release of the fluid the compressed spring presses the lid against the base.
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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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |