US3752629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mold trim device
Assignee: BW-MORROW PLASTICS Inc
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Filing: 1972-02-29
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Granted: 1973-08-14
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Expires: 1992-02-29
Abstract
Abstract A parison cutting device mounted on a mold. A knife blade mounted on one mold half extends out beyond the face of that mold half and reacts resiliently against a surface on the other mold half to cut by a shearing action a parison extending into the mold between the knife blade and the reaction surface as the mold halves close against each other to form the single mold cavity. The blade angle may be selected to provide either a sealed or an opened parison.
Inventors
- 👤 J Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:32
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/42; B29C49/4273; B29C49/428; B29C49/42802; B29C49/48; B29C49/50; B29C2793/00; Y; Y10; Y10S; Y10S425/00; Y10S425/806
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
196 words
For a mold of the type comprising first and second mold halves mounted for relative movement toWard and away from each other for molding an elongated parison into the shape of a cavity formed in the opposing faces of the closed mold halves; a cutting means for cutting an elongated parison extending from outside the area between the opposing faces of the mold halves into said area, said cutting means comprising, a generally flat knife blade mounted on the outside of the first mold half, and projecting out beyond the said face of that mold half toward the second mold half, said blade extending in a plane generally transverse to the direction of elongation of the parison, means resiliently urging the cutting edge of the blade toward the first mold half, a reaction surface on the second mold half positioned to be engaged by the knife blade as the mold halves close against each other, whereby as the mold halves close against each other, a parison extending into the mold between the knife blade and the reaction surface is cut as the knife blade resiliently engages the reaction surface under the influence of said resilient means.
Claim 2
Dependent Claim
196 words
For a mold of the type comprising first and second mold halves mounted for relative movement toWard and away from each other for molding an elongated parison into the shape of a cavity formed in the opposing faces of the closed mold halves; a cutting means for cutting an elongated parison extending from outside the area between the opposing faces of the mold halves into said area, said cutting means comprising, a generally flat knife blade mounted on the outside of the first mold half, and projecting out beyond the said face of that mold half toward the second mold half, said blade extending in a plane generally transverse to the direction of elongation of the parison, means resiliently urging the cutting edge of the blade toward the first mold half, a reaction surface on the second mold half positioned to be engaged by the knife blade as the mold halves close against each other, whereby as the mold halves close against each other, a parison extending into the mold between the knife blade and the reaction surface is cut as the knife blade resiliently engages the reaction surface under the influence of said resilient means.
Claim 3
Dependent Claim
107 words
The invention of claim 1, wherein the cutting edge of the blade, viewed in the direction from which the parison enters the area between the mold halves, forms an angle with the plane of the said face of the first mold half, and wherein the reaction surface extends across the second mold half generally parallel to the plane of the said face of the second mold half, whereby as the mold halves close onto each other, a leading part of the knife blade edge first engages the reaction surface, after which successive trailing parts of the knife blade edge engage the reaction surface in a shearing action.
Claim 4
Dependent Claim
120 words
The invention of claim 2, said resilient means comprising the construction wherein: the knife blade is of a stiff hard resilient material, and including means for securing the blade to the outside of the first mold half to rock about a rocking axis located near and generally parallel to the said face of the first mold half, and means for urging the rear part of the said knife blade on the side of the rocking axis away from the said face away from the mold, and hence causing the front part of the knife blade on the side of the rocking axis closest to the said face of the first mold half to be urged toward the first mold half.
Claim 5
Dependent Claim
45 words
The invention of claim 3, wherein said means for urging is adjustable to vary the force acting on the said rear part of the knife blade to thus vary the resilient force of the front part of the knife blade toward the first mold half.
Claim 6
Dependent Claim
35 words
The invention of claim 2, wherein the cutting edge of the blade, taken in a plane perpendicular to the plane of the first mold half face, is inclined rearwardly toward the inside of the mold.
Claim 7
Dependent Claim
37 words
The invention of Claim 2, wherein the cutting edge of the blade, taken in a plane generally perpendicular to the plane of the first mold half face is inclined rearwardly away from the inside of the mold.
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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |