Injection blow molding apparatus

Claim 2

An injection molding machine comprising a series of molds, a core for each mold, means constantly traveling said molds in a closed path, a plastic injection device, means to travel the latter in synchronism with each mold successively for a portion only of said path, means to actuate the plastic injection device to cause the same to inject plastic material onto the core of each mold during the period of mutual travel of each mold and the plastic injection device, a cavity in the plastic injection device, said cavity receiving each core in turn, said cavity forming the plastic on each core in turn, the plastic injection device injection plastic into said cavity, a pair of cavity forming members on each mold, means to open and close said members about the core on the respective mold, and means to blow air into the plastic on each core upon closing of the cavity forming members on each mold.

Claim 3

The injection molding machine of claim 1 including an air passage in the core for the blown air.

Claim 4

The injection molding machine of claim 2 wherein each core comprises a core cylinder and a core pin therein, the cylinder and core pin including means together forming an air valve, and means to rectilinearly move the core pin relative to the core cylinder to open and close the valve in timed relation to the closing of the cavity forming members on the mold.

Claim 5

An injection blow molding machine comprising a series of blow molds, a core for each mold, means to travel said molds in a closed path, an injection cavity mOld, a cavity in the latter, means to bring the injection cavity mold into closed cooperation relative to each of the blow molds successively with a core located in the cavity, means to travel the injection cavity mold with each of the blow molds in closed relationship therewith for a portion only of the path of the blow molds, means to separate the molds, means on the injection cavity mold to inject molding material into the cavity forming a blank on the respective core during the interval of the mutual travel of the molds, means blowing air into the blank to form an article, and means to operate said last named means upon separation of the molds.

Claim 6

An injection blow molding machine comprising a series of blow molds, a core for each mold, means to travel said molds in a closed path, an injection cavity mOld, a cavity in the latter, means to bring the injection cavity mold into closed cooperation relative to each of the blow molds successively with a core located in the cavity, means to travel the injection cavity mold with each of the blow molds in closed relationship therewith for a portion only of the path of the blow molds, means to separate the molds, means on the injection cavity mold to inject molding material into the cavity forming a blank on the respective core during the interval of the mutual travel of the molds, means blowing air into the blank to form an article, and means to operate said last named means upon separation of the molds.

Claim 7

The injection blow molding machine of claim 4 including movable members forming a cavity in each blow mold about the respective core, and timed means holding the movable members separated during the injection and closing the blow mold cavity members about the core after the injection but before the blowing of the air.

Claim 8

The injection blow molding machine of claim 5 including a neck ring forming a part of each cavity in the blow mold, and means to move the neck ring parallel to the cores to strip the articles from the cores, upon opening of the cavities in the blow cavity mold.

Claim 9

The injection blow molding machine of claim 6 wherein the neck ring comprises two separable parts, and including means to separate the neck ring parts to release the articles stripped from the cores.

Claim 10

An injection blow molding machine comprising: a turret, means to turn the turret unidirectionally and constantly on an axis, a series of blow cavity molds in mutually spaced relationship about the periphery of the turret, movable pairs of cavity-forming members on each blow cavity mold, timed means to open and close the cavity-forming members, a core associated with each pair of cavity-forming members to be exposed when the latter are open and enclosed when said members are closed, an injection cavity mold, injection cavities in the latter surrounding the cores, means to travel the injection cavity mold in synchronization with each blow cavity mold successively for a portion only of the travel of the blow cavity molds, timed means to close the molds relative to each other with a core in each injection cavity mold cavity, means to inject plastic into each of the last named cavities about the core therein during the mutual travel of both molds, means to retract the molds, a source of air under pressure, an air passage therefor leading into the cores to form articles of said plastic by expanding the plastic into conformance with the blow cavity mold cavities with the latter closed, and means to reopen the blow cavity mold cavities for ejection of the articles so formed.

Claim 11

An injection blow molding machine comprising: a turret, means to turn the turret unidirectionally and constantly on an axis, a series of blow cavity molds in mutually spaced relationship about the periphery of the turret, movable pairs of cavity-forming members on each blow cavity mold, timed means to open and close the cavity-forming members, a core associated with each pair of cavity-forming members to be exposed when the latter are open and enclosed when said members are closed, an injection cavity mold, injection cavities in the latter surrounding the cores, means to travel the injection cavity mold in synchronization with each blow cavity mold successively for a portion only of the travel of the blow cavity molds, timed means to close the molds relative to each other with a core in each injection cavity mold cavity, means to inject plastic into each of the last named cavities about the core therein during the mutual travel of both molds, means to retract the molds, a source of air under pressure, an air passage therefor leading into the cores to form articles of said plastic by expanding the plastic into conformance with the blow cavity mold cavities with the latter closed, and means to reopen the blow cavity mold cavities for ejection of the articles so formed.

Claim 12

The injection blow molding machine of claim 8 wherein the means to travel the injection cavity mold includes an oscillatory member and means to oscillate the same.

Claim 13

The injection blow molding machine of claim 9 wherein the oscillatory member is pivoted on an axis generally coincident with the axis of the turret.

Claim 14

The injection blow molding machine of claim 10 wherein the oscillatory member is diametrically arranged relative to the turret.

Claim 15

The injection blow molding machine of claim 11 including a platen on the oscillatory member, the injection cavity mold being mounted on the platen.

Claim 16

The injection blow molding machine of claim 8 including a source of plastic material and a flexible conduit for the plastic leading from the source of plastic to the injection cavity mold.

Claim 17

The injection blow molding machine of claim 8 wherein the turret is vertical and its axis is horizontal, the means to travel the injection cavity mold comprising a beam pivoted coaxially with respect to the turret, and means to oscillate the beam on its axis.

Claim 18

The injection blow molding machine of claim 14 wherein the injection cavity mold is slidable on the beam to close with and retract from the blow cavity mold, the means to close the molds including Means on the beam to reciprocate the injection cavity mold.