Patent US3767352A successfully refreshed from Google Patents.
US3767352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection mold with unloading mechanism
Assignee: Husky Manufacturing and Tool Works Ltd
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Filing: 1971-07-12
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Granted: 1973-10-23
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Expires: 1991-07-12
Abstract
Abstract Two pairs of lever arms, fulcrumed on one of two relatively movable mold portions, form part of an articulated linkage anchored to the other mold portion and connected with either a stripper plate between the two mold portions or an ejector plate behind the second mold portion. Upon the opening of the mold, the stripper or ejector plate moves relatively to the adjacent mold portion, in a direction discharging the molded articles from the mold cavities, at a rate substantially conforming to a Gaussian curve. The linkage may include a lost-motion coupling to hold the plate in an inoperative position during a terminal phase of a closure stroke.
Inventors
- 👤 H Rees
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:56
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/26; B29C45/32; B29C45/40; B29C45/4005; B29C2045/324
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
116 words
In an injection-molding machine, in combination, a first mold portion and a second mold portion together defining at least one mold cavity, said mold portions being relatively displaceable between an open-mold position and a closed-mold position; unloading means on said first mold portion movable with reference thereto for dislodging an article molded in said cavity; and an articulated linkage with several pivotally interconnected parts joined to both said mold portions for actuation of said unloading means, in response to a displacement of said mold portions into said open-mold position, by advancing said unloading means from a retracted position into an operative position at a reduced rate with reference to the relative displacement of said mold portions.
Claim 2
Dependent Claim
116 words
In an injection-molding machine, in combination, a first mold portion and a second mold portion together defining at least one mold cavity, said mold portions being relatively displaceable between an open-mold position and a closed-mold position; unloading means on said first mold portion movable with reference thereto for dislodging an article molded in said cavity; and an articulated linkage with several pivotally interconnected parts joined to both said mold portions for actuation of said unloading means, in response to a displacement of said mold portions into said open-mold position, by advancing said unloading means from a retracted position into an operative position at a reduced rate with reference to the relative displacement of said mold portions.
Claim 3
Dependent Claim
40 words
The combination defined in claim 1 wherein said unloading means comprises a plate perpendicular to the direction of mold displacement, said linkage being duplicated on opposite sides of said mold portions with engagement of said plate at diametrically opposite locations.
Claim 4
Dependent Claim
51 words
The combination defined in claim 2 wherein each linkage comprises an elongate member pivoted to one of said mold portions and a shorter swingable element fulcrumed on the other of said mold portions and pivotally joined to said member, the latter extending generally parallel to said plate in said closed-mold position.
Claim 5
Dependent Claim
44 words
The combination defined in claim 3 wherein said element is a bell-crank lever on said first mold portion with one arm linked to said member, another arm rigid with said one arm and a pivoted extension of said other arm linked to said plate.
Claim 6
Dependent Claim
61 words
The combination defined in claim 4 wherein said first mold portion is provided with two throughgoing transverse shafts each having one end secured to the bell-crank lever of a respective linkage and being provided at its opposite end with a further arm parallel and coextensive with said other arm, said further arm also having a pivoted extension linked to said plate.
Claim 7
Dependent Claim
20 words
The combination defined in claim 4 wherein the length of said member substantially exceeds that of either of said arms.
Claim 8
Dependent Claim
36 words
The combination defined in claim 4 wherein said plate is disposed between said mold portions and is provided with an annular formation traversed by a cavity-defining projection on said first mold portion in said closed-mold position.
Claim 9
Dependent Claim
42 words
The combination defined in claim 4 wherein said plate is disposed on the side of said first mold portion remote from said second mold portion and is provided with an ejector pin traversing said first mold portion and terminating at said cavity.
Claim 10
Dependent Claim
39 words
The combination defined in claim 3 wherein said member is pivoted to said first mold portion and is provided at an intermediate point with cam means positioned to bear upon said plate upon partial separation of said mold portions.
Claim 11
Dependent Claim
27 words
The combination defined in claim 9 wherein said first mold portion is provided with resilient means yieldably urging said plate into contact with said first mold portion.
Claim 12
Dependent Claim
63 words
The combination defined in claim 3, further comprising a third mold portion defining with one of the other mold portions at least one further mold cavity, said member being pivoted to the middle one of said mold portions and being linked through respective swingable elements with the two outer mold portions, said plate being duplicated on opposite sides of the middle mold portion.
Claim 13
Dependent Claim
32 words
The combination defined in claim 3 wherein each linkage includes a lost-motion coupling for enabLing said member to pivot without entrainment of said swingable element in a terminal phase of mold closure.
Claim 14
Dependent Claim
26 words
The combination defined in claim 12 wherein said lost-motion coupling includes a pair of telescoped parts and spring means tending to maintain said parts relatively extended.
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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |