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US3753641A Expired / Lapsed US ⏱️ 0.0 years remaining

Mold for articles having undercut portions

Assignee: Continental Can Co Inc
•
Filing: 1969-12-22
•
Granted: 1973-08-21
•
Expires: 1989-12-22
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Abstract

Abstract A partible mold has complementary body parts defining a principal portion of the mold cavity and at least one independently movable end part defining a cavity portion having undercuts relative to parting of the mold at the principal parting line. The end part is movable relative to the mold body in a direction generally parallel to the principal parting line, the parting line between the separately movable end part and the associated body part being transverse to the principal parting line. The end part is retractable from the complementary body part to clear the undercut portions of the article for parting of the body parts and ejection of the article. The end part and its actuating mechanism are carried on extension wings of the complementary body part for handling as a unit in an automatic molding machine. After ejection of the article, the end part is closed for clamping operation in association with the body of the mold.

Inventors

  • 👤 H Turner
  • 👤 D Adomaitis
  • 👤 E Boik

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-03 03:05
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/42; B29C49/48; B29C49/4802; B29C49/4817; B29C33/00; B29C33/44; B29C49/54; B29C2049/542; B29C2049/546; Y; Y10; Y10S; Y10S425/00; Y10S425/058

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 170 words
A mold section for a partible mold including first and second relatively movable mold portions defining respective undercut bottom wall portion forming and body wall portion forming cavities, said cavities defining coincident cavity surfaces in the closed position of said mold portions, means for applying relative motion to said first and second relatively movable mold portions to move the cavity defining surfaces thereof awAy from each other to an open position, said applying means includes pivot means and toggle linkage means, said toggle linkage means being disposed between said pivot means and said bottom wall portion forming cavity, said pivot means includes a first stationary pivot pin, a link mounted upon said first stationary pivot pin, means for imparting motion to said link, said toggle linkage means includes at least two links, one of said two links being pivotally secured to said bottom wall portion forming cavity by a first pivot pin movable therewith, and the other of said two links being pivotally secured to a second stationary pivot pin.
Claim 2
Dependent Claim 170 words
A mold section for a partible mold including first and second relatively movable mold portions defining respective undercut bottom wall portion forming and body wall portion forming cavities, said cavities defining coincident cavity surfaces in the closed position of said mold portions, means for applying relative motion to said first and second relatively movable mold portions to move the cavity defining surfaces thereof awAy from each other to an open position, said applying means includes pivot means and toggle linkage means, said toggle linkage means being disposed between said pivot means and said bottom wall portion forming cavity, said pivot means includes a first stationary pivot pin, a link mounted upon said first stationary pivot pin, means for imparting motion to said link, said toggle linkage means includes at least two links, one of said two links being pivotally secured to said bottom wall portion forming cavity by a first pivot pin movable therewith, and the other of said two links being pivotally secured to a second stationary pivot pin.
Claim 3
Dependent Claim 27 words
The mold section as defined in claim 1 including another link pivotally mounted between said first mentioned link and said two links by respective movable pivot pins.
Claim 4
Dependent Claim 29 words
The mold section as defined in claim 2 wherein said first-mentioned link is a bellcrank lever joined by a fourth movable pivot pin to said relative motion applying means.
Claim 5
Dependent Claim 19 words
The mold section as defined in claim 3 wherein said relative motion applying means is a piston-cylinder fluid motor.

References Cited (Backward Citations)

US1799145A Cited
US2358857A Cited
US2579399A Cited
US2903740A Cited
US3050773A Cited
DE1454915A1 Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-08-20 1977-02-19 1977-08-21 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-08-20 1981-02-19 1981-08-21 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-08-20 1985-02-19 1985-08-21 $7700.00 Window Closed / Lapsed

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