Apparatus for molding plastic containers

Claim 2

In a blow molding apparatus the combination comprising: a. a double-acting, fluid-actuated power assembly having an axially aligned, reciprocable rod extending from one end thereof; b. a hollow stripper tube attached to said power assembly at said one end, said tube surrounding and being axially aligned with and spaced from said rod; c. a blow pin assembly surrounded by and spaced from said tube and having one end attached to said rod whereby its other end is movable into and out of the open end of said stripper tube; and d. a removable generally cylindrical stripper sleeve received in the outer end of said sleeve surrounding and in slidable contact with a portion of said blow pin assembly.

Claim 3

In the apparatus of claim 1 wherein said tube is provided with a plurality of longitudinally extending slots adapted to receive connector means for supplying said cooling fluid and blowing gas to said blow pin assembly.

Claim 4

In the apparatus of claim 1 including means to support the components set forth in subparagraphs a) through d) of claim 1, said support means including means to change the axial position of said components.

Claim 5

In the apparatus of claim 1 wherein said stripper sleeve is seated on a shoulder provided on the interior wall of said stripper tube and said blow pin assembly is removably attached to said one end of said rod.

Claim 6

In a blow molding apparatus for producing hollow plastic articles with necks, the combination comprising: a. a pair of blow mold halves, each of which is provided with neck-forming means defining, when closed, a generally cylindrical opening at one end thereof, said opening terminating in an conically shaped, outwardly inclined, terminal wall portion; b. a blow pin adapted to be inserted in said opening, i. said blow pin providing a flat shoulder having a sharp edge adjacent one end, which shoulder is slightly larger than said opening and is adapted to seat on said terminal wall portion to sever or partially sever the excess plastic material from said neck, ii. said blow pin providing an annular groove adjacent and rearwardly of said sharp edged shoulder adapted to receive some of said excess plastic material and to retain said excess plastic material on said blow pin when said pin is removed from said opening; and c. a hollow stripper sleeve slidably receiving said blow pin and adapted to strip said excess plastic material therefrom when said one end is retracted into said stripper sleeve.

Claim 7

In a blow molding apparatus for producing hollow plastic articles with necks, the combination comprising: a. a pair of blow mold halves, each of which is provided with neck-forming means defining, when closed, a generally cylindrical opening at one end thereof, said opening terminating in an conically shaped, outwardly inclined, terminal wall portion; b. a blow pin adapted to be inserted in said opening, i. said blow pin providing a flat shoulder having a sharp edge adjacent one end, which shoulder is slightly larger than said opening and is adapted to seat on said terminal wall portion to sever or partially sever the excess plastic material from said neck, ii. said blow pin providing an annular groove adjacent and rearwardly of said sharp edged shoulder adapted to receive some of said excess plastic material and to retain said excess plastic material on said blow pin when said pin is removed from said opening; and c. a hollow stripper sleeve slidably receiving said blow pin and adapted to strip said excess plastic material therefrom when said one end is retracted into said stripper sleeve.

Claim 8

In the apparatus of claim 5 wherein said sharp edged, flat shoulder is provided on a separable cutter sleeve carried by said blow pin.

Claim 9

In the apparatus of claim 5 wherein said neck-forming means includes a pair of neck insert halves removably attached to said blow mold halves.

Claim 10

In the apparatus of claim 6 wherein said cutter sleeve is provided with a sharp edged, flat shoulder adjacent each end thereof.

Claim 11

In the apparatus of claim 7 including a pair of anvils removably attached to said neck insert halves to provide said conically shaped, outwardly inclined, terminal wall portion of said cylindrical opening.