US3865529A — Molding apparatus

Claim 1

Independent Claim 261 words

An injection mold for manufacture of a plastic article having a bottom wall and a plurality of side wall portions forming a generally hollow polygonal enclOsure with an inwardly extending flange portion adjacent an open top of said article thereby to constrict said top opening, said mold comprising: first mold means having a mold defining surface corresponding to the exterior surface dimensions of at least a portion of said article; and second mold means having a mold defining surface corresponding to the interior surface dimensions of said article and comprising a generally frusto-pyramidal central member having a plurality of side wall portions of a predetermined slope and corresponding in number to said plurality of article side walls and having a plurality of corner wall portions located intermediate respective pairs of said central member side wall portions with said corner wall portions having a lesser slope than said side wall portions and further including side wall segments slidably movable along respective ones of each of said side wall portions, and corner wall segments slidably movable along respective ones of said corner wall portions, said side and corner wall segments each being movable from respective mold defining positions in which said segments cooperate with said central member to form said mold defining surface of said second mold means and a collapsed position in which said side and corner wall segments are displaced relative to said central member so that said second mold means is suffficiently reduced in size to permit it to be withdrawn from the constricted top opening of said plastic article.

Claim 2

Dependent Claim 261 words

An injection mold for manufacture of a plastic article having a bottom wall and a plurality of side wall portions forming a generally hollow polygonal enclOsure with an inwardly extending flange portion adjacent an open top of said article thereby to constrict said top opening, said mold comprising: first mold means having a mold defining surface corresponding to the exterior surface dimensions of at least a portion of said article; and second mold means having a mold defining surface corresponding to the interior surface dimensions of said article and comprising a generally frusto-pyramidal central member having a plurality of side wall portions of a predetermined slope and corresponding in number to said plurality of article side walls and having a plurality of corner wall portions located intermediate respective pairs of said central member side wall portions with said corner wall portions having a lesser slope than said side wall portions and further including side wall segments slidably movable along respective ones of each of said side wall portions, and corner wall segments slidably movable along respective ones of said corner wall portions, said side and corner wall segments each being movable from respective mold defining positions in which said segments cooperate with said central member to form said mold defining surface of said second mold means and a collapsed position in which said side and corner wall segments are displaced relative to said central member so that said second mold means is suffficiently reduced in size to permit it to be withdrawn from the constricted top opening of said plastic article.

Claim 3

Dependent Claim 126 words

The mold of claim 1 in which all of said corner wall segments in moving between their mold defining and collapsed positions follow paths having like predetermined lateral and longitudinal components and in which said side wall segments in moving between their mold defining and collapsed positions follow like paths having lateral and longitudinal components different from said predetermined components and further including ejection means comprising an ejection plate movable between first and second positions and separate mechanical linkage elements coupled between said ejection plate and said side wall and corner wall segments, said linkage elements being constructed and arranged for displacing said corner and side wall segments at a like longitudinal rate with movement of said ejection plate means between said first and second positions.

Claim 4

Dependent Claim 75 words

The mold of claim 1 in which said central member includes a top and a bottom wall and in which the planar projection of the line formed by the intersection of each of said corner walls and one of said adjacent side wall portions of said central member is parallel to the planar projection of the line formed by the intersection of the remaining adjacent side wall and the top wall of said central member.

Claim 5

Dependent Claim 27 words

The mold of claim 3 in which the included angle formed between each of said corner wall segments and said adjacent side wall segments is 45* .

Claim 6

Dependent Claim 27 words

The mold of claim 4 in which said second mold means includes four side wall and four corner wall portions, respectively, for defining a generally rectangular surface.

Claim 7

Dependent Claim 31 words

The mold of claim 5 in which the planar projections of the top and the bottom walls, respectively, of each of said corner wall segments defines respective right angle isosceles triangles.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1978-02-10	1978-08-12	1979-02-11	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1982-02-10	1982-08-12	1983-02-11	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1986-02-10	1986-08-12	1987-02-11	$7700.00	Window Closed / Lapsed

Molding apparatus

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