Multiple injection blow molding machine

Claim 2

In an injection blow molding machine having a rotatable and elevatable turret carrying parison pins and surrounded by operating stations including an opposing pair of parison mold stations comprised of separable parison molds having fixed lower mold halves and vertically movable upper mold halves; the improvement comprising means clamping the upper mold halves of the parison molds with equal pressure onto the lower mold halves and means actuated by said equalized clamping means for elevating the turret in synchronous movement with the upper mold halves and at a distance one-half the distance of the upper mold halves so that the pins carried by the turret are disposed equidistant with the part line between the mold halves, said upper movable mold halves being raised and lowered by vertically oriented toggle linkages, a horizontally disposed equalizer bar connecting said toggle linkages and an operating ram with which the bar is axially aligned and to which one end of the bar is connected whereby the thrusts of the ram are transmitted by the bar to the toggle linkages and translated thereby into vertical opening and closing movements of the upper mold halves.

Claim 3

The invention of claim 1 wherein said turret has an upstanding elevating shaft and said bar is connected to the shaft by a lost motion connection permitting independent axial movement of the bar in transmission of the ram thrusts to the toggle linkages for the mold halves and means is provided between the bar and the shaft operative to lift the shaft and the turret.

Claim 4

In an injection blow molding machine having a rotatable and elevatable turret carrying parison pins and surrounded by operating stations including an opposing pair of parison mold stations comprised of separable parison molds having fixed lower mold halves and vertically movable upper mold halves; the improvement comprising means clamping the upper mold halves of the parison molds with equal pressure onto the lower mold halves and means actuated by said equalized clamping means for elevating the turret in synchronous movement with the upper mold halves and at a distance one-half the distance of the upper mold halves so that the pins carried by the turret are disposed equidistant with the part line between the mold halves, said upper mold halves being carried by a common press plate and the lower mold halves being fixed on a common platen, said press plate being mounted for guided vertical reciprocable movement relative to the platen and vertical support frames, said press plate being mounted for sliding movement relative to said support frames, said clamping means including said press plate carrying said upper mold halves and a pair of vertically oriented toggle linkages connecting the press plate to the support frames, each of said toggle linkages having upper links secured by fixed pivots to the support frames and lower links secured by movable pivots to the press plate, said upper and lower links being joined by movable pivots, a horizontally disposed equalizer and actuator bar connected to the joining movable pivots between the links and a horizontal cylinder having a power ram aligned with and connected to the bar for supplying power thrusts to the bar which transmits such thrusts to the toggle linkages for translation into up and down movement of the press plate carrying the upper mold halves.

Claim 5

In an injection blow molding machine having a rotatable and elevatable turret carrying parison pins and surrounded by operating stations including an opposing pair of parison mold stations comprised of separable parison molds having fixed lower mold halves and vertically movable upper mold halves; the improvement comprising means clamping the upper mold halves of the parison molds with equal pressure onto the lower mold halves and means actuated by said equalized clamping means for elevating the turret in synchronous movement with the upper mold halves and at a distance one-half the distance of the upper mold halves so that the pins carried by the turret are disposed equidistant with the part line between the mold halves, said upper mold halves being carried by a common press plate and the lower mold halves being fixed on a common platen, said press plate being mounted for guided vertical reciprocable movement relative to the platen and vertical support frames, said press plate being mounted for sliding movement relative to said support frames, said clamping means including said press plate carrying said upper mold halves and a pair of vertically oriented toggle linkages connecting the press plate to the support frames, each of said toggle linkages having upper links secured by fixed pivots to the support frames and lower links secured by movable pivots to the press plate, said upper and lower links being joined by movable pivots, a horizontally disposed equalizer and actuator bar connected to the joining movable pivots between the links and a horizontal cylinder having a power ram aligned with and connected to the bar for supplying power thrusts to the bar which transmits such thrusts to the toggle linkages for translation into up and down movement of the press plate carrying the upper mold halves.

Claim 6

The invention of claim 3 wherein said means for elevating the turret includes a vertical elevator shaft for the turret, said bar having a lost motion connection with said shaft for moving the shaft upwardly after initial movement of the press plate.

Claim 7

The invention of claim 4 including a vertically oriented toggle linkage connected by a fixed pivot to the support frame and by movable pivots to the press plate and to the cylinder.

Claim 8

The invention of claim 5 wherein said lost motion connection includes said bar having a vertically disposed axially extending slot within which the shaft is slidably disposed, said shaft having an enlargement bearing on the bar and by means of which the lifting force of the bar is transmitted to the shaft.