Device for closing a mould cavity

Claim 3

A device as in claim 1 including an axially movable member for introducing plastic into the hollow space of the cavity, said member being movable into the cavity through said aperture, said punching die being mounted in the slide so that it can move axially and can be moved with the slide at right angles to the axis of the punching die.

Claim 4

A device as in claim 2 including a joint actuating member connected with the slide and the punching die.

Claim 5

A device as in claim 3 wherein said joint actuating member includes retaining means connected between the punching die and the slide for imparting movement to the punching die relative to the slide in response to the arrival of the slide at its closed position.

Claim 6

A device as in claim 3 wherein the slide has an exchangeable annular insert which surrounds the punching die and blocks off the aperture when the slide is in the closed position.

Claim 7

A device as in claim 4 wherein the punching die has a rocker engaging with it which is mounted in the slide so as to swivel, and wherein an operating cylinder is operatively connected with the rocker.

Claim 8

A device as in claim 6 wherein the operating cylinder has a plunger which engages with the slide via a compression spring and which is connected with the rocker via a further compression spring and also the retaining means.

Claim 9

In apparatus for welding a head to a tubular body to produce a thermoplastic container, said apparatus being of the type including a mandrel having a shouldered head end, said tubular body being disposable on said mandrel with one end adjacent said shouldered head end of said mandrel, a female mold having a cavity defined by a shoulder forming section which is axially aligned with said mandrel, said shoulder forming section having an aperture axially aligned with said mandrel, means extendable and retractable through said aperture in said mold for ejecting into the mold cavity a quantity of thermoplastic material which is stripped off when the ejecting means is withdrawn, and means for moving said mandrel and mold relatively toward each other to cause the scraped-off quantity of thermoplastic material to come in contact with said one end of the tubular body and be welded thereto as a head for the tubular body, the improvement comprising a slide mounted for movement at right angles to said mandrel and having one terminal position in which it blocks off said aperture in said mold, and a punching die which passes through said aperture when said aperture is blocked by said slide, said punching die being movable both transversely of and parallel to the longitudinal axis of said mandrel.

Claim 10

In apparatus for welding a head to a tubular body to produce a thermoplastic container, said apparatus being of the type including a mandrel having a shouldered head end, said tubular body being disposable on said mandrel with one end adjacent said shouldered head end of said mandrel, a female mold having a cavity defined by a shoulder forming section which is axially aligned with said mandrel, said shoulder forming section having an aperture axially aligned with said mandrel, means extendable and retractable through said aperture in said mold for ejecting into the mold cavity a quantity of thermoplastic material which is stripped off when the ejecting means is withdrawn, and means for moving said mandrel and mold relatively toward each other to cause the scraped-off quantity of thermoplastic material to come in contact with said one end of the tubular body and be welded thereto as a head for the tubular body, the improvement comprising a slide mounted for movement at right angles to said mandrel and having one terminal position in which it blocks off said aperture in said mold, and a punching die which passes through said aperture when said aperture is blocked by said slide, said punching die being movable both transversely of and parallel to the longitudinal axis of said mandrel.

Claim 11

Apparatus as in claim 8 wherein said punching die is mounted in said slide so that it can move axially and can be moved with the slide at right angles to the axis of the punching die.

Claim 12

Apparatus as in claim 9 including a joint actuating member connected with the slide and the punching die.

Claim 13

Apparatus as in claim 10 wherein said joint actuating member includes retaining means connected between the punching die and the slide for imparting movement to the punching die relativE to the slide in response to the arrival of the slide at said one terminal position.

Claim 14

Apparatus as in claim 10 wherein the slide has an exchangeable annular insert which surrounds the punching die and blocks off said aperture when the slide is at said one terminal position.

Claim 15

Apparatus as in claim 11 wherein the punching die has a rocker engaging with it which is mounted in the slide so as to swivel, and wherein an operating cylinder is operatively connected with the rocker.

Claim 16

Apparatus as in claim 13 wherein the operating cylinder has a plunger which engages with the slide via a compression spring and which is connected with the rocker via a further compression spring and also with said retaining means.

Claim 17

In a device for molding a head on to a container blank, a cavity member defining a molding cavity and an aperture leading into said cavity, said aperture having an inside end and an outside end, a mandrel insertable into said cavity member towards the inside end of said aperture for introducing a portion of said container blank into said molding cavity, said mandrel comprising a front end, material feed means insertable and withdrawable from said molding cavity through said aperture for feeding molding material into said molding cavity and closure means for sealingly closing said aperture at the outside end thereof when said material feed means is in withdrawn position, said closure means comprising a punching die movable parallel to the longitudinal axis of said mandrel and through said aperture for cooperation with the front end of the mandrel when said closure means are in closing position.

Claim 18

In a device for molding a head on to a container blank, a cavity member defining a molding cavity and an aperture leading into said cavity, said aperture having an inside end and an outside end, a mandrel insertable into said cavity member towards the inside end of said aperture for introducing a portion of said container blank into said molding cavity, said mandrel comprising a front end, material feed means insertable and withdrawable from said molding cavity through said aperture for feeding molding material into said molding cavity and closure means for sealingly closing said aperture at the outside end thereof when said material feed means is in withdrawn position, said closure means comprising a punching die movable parallel to the longitudinal axis of said mandrel and through said aperture for cooperation with the front end of the mandrel when said closure means are in closing position.

Claim 19

A device as in claim 15 wherein said closure means further includes a slide movable at right angles to said mandrel, said die being mounted in said slide so that it can move axially and can be moved with the slide at right angles to the axis of the punching die.

Claim 20

A device as in claim 16 including a joint actuating member connected with the slide and the punching die.

Claim 21

A device as in claim 17 wherein said joint actuating member includes means connected between the punching die and the slide for imparting movement to the punching die relative to the slide in response to the arrival of the slide at said one terminal position.

Claim 22

A device as in claim 17 wherein the slide has an exchangeable annular insert which surrounds the punching die and blocks off said aperture when the slide is at said one terminal position.

Claim 23

A device as in claim 18 wherein the punching die has a rocker engaging with it which is mounted in the slide so as to swivel, and wherein an operating cylinder is operatively connected with the rocker.

Claim 24

A device as in claim 20 wherein the operating cylinder has a plunger which engages with the slide via a compression spring and which is connected with the rocker via a further compression spring and also with said retaining means.