Removeable blow needle mechanism

Claim 2

In a split mold having an internal cavity and carrying an assembly which includes a blow needle and means for reciprocating said needle in a bore opening into said cavity formed in a section of said split mold for puncturing and expanding in said cavity a clamped off portion oF a tubular parison, the improvement which comprises means removably mounted at said bore end opening into the cavity to delimit advancing movement of said assembly, said assembly being removeable through said bore end upon removal of said means.

Claim 3

The apparatus of claim 1 wherein said cavity includes a portion for containing waste flash, said bore opening into such flash containing cavity portion and said means comprising a stop member.

Claim 4

The apparatus of claim 2 wherein said blow needle is hollow, said means for reciprocating includes a piston carrying said needle and, said needle extending through said stop member.

Claim 5

The apparatus of claim 2 wherein said stop member has a plurality of flow channels formed therein opening at one end into the bore and at the other end into a peripherally extending annular depression in the surface of said stop member.

Claim 6

The apparatus of claim 2 including a pair of set screws extending through the stop member on either side of the longitudinal axis of the mold section in which it is mounted.

Claim 7

The apparatus of claim 3 wherein said piston has a cylindrical cavity formed therein, and including a rod releasably secured in the cavity of said piston, said rod having an axially extending bore, a rearward end portion of said needle having an outwardly flared section releasably clamped between a surface portion of said rod and a surface portion of said cylindrical cavity, the hollow interior of said needle being substantially aligned with the bore in said rod.

Claim 8

The apparatus of claim 4 including a pressurized air supply channel in the mold section opening into said annular depression.

Claim 9

In a molding machine of the type including a mold having sections with hollow portions which define an internal cavity when closed on each other and carrying a needle assembly which includes a blow needle and means for reciprocating said blow needle for puncturing and expanding in said cavity a clamped off portion of a tubular parison, the improvement which comprises: a. a bore for said needle assembly extending through one of said sections substantially perpendicular to the longitudinal axis thereof and opening into a flash holding portion of the hollow portion of said one section, said flash holding portion being semi-circular in cross section; b. a stop member mounted in said bore at the end opening into said flash holding portion, and stop member having a semicircular end portion flush with that of the surface of the flash holding portion and a central channel for the needle of said assembly; and c. means adjacent each side of the semi-circular end portion for releasably securing said stop member to said one mold section, said assembly being removable through said bore end opening into said flash holding portion upon removal of said stop member.

Claim 10

In a molding machine of the type including a mold having sections with hollow portions which define an internal cavity when closed on each other and carrying a needle assembly which includes a blow needle and means for reciprocating said blow needle for puncturing and expanding in said cavity a clamped off portion of a tubular parison, the improvement which comprises: a. a bore for said needle assembly extending through one of said sections substantially perpendicular to the longitudinal axis thereof and opening into a flash holding portion of the hollow portion of said one section, said flash holding portion being semi-circular in cross section; b. a stop member mounted in said bore at the end opening into said flash holding portion, and stop member having a semicircular end portion flush with that of the surface of the flash holding portion and a central channel for the needle of said assembly; and c. means adjacent each side of the semi-circular end portion for releasably securing said stop member to said one mold section, said assembly being removable through said bore end opening into said flash holding portion upon removal of said stop member.