Parison oven

Claim 2

An oven for heating parisons comprising, a conveyor for carrying said parisons along a path within the oven, said conveyor including an elongated member extending along said path within the oven, parison holding means fixed on said member for holding parisons in an upright position thereon, said parison holdiNg means including a circular member having a frictional outer peripheral surface located at a given height above the bottom of the oven, means for directing heated air through the oven to heat the parisons, and a turning means for periodically turning the parisons about their own axes as they travel through the oven, whereby the parisons are heated more uniformly, said turning means comprising an abutment member in the form of a frictional plate fixed along the side of said path at the said given height, wherein as each parison holding means moves along said path, its circular member is frictionally engaged by said frictional plate and turned about its axis to turn the parison about its axis.

Claim 3

The invention of claim 1, including wheel means spaced throughout the oven, and the elongated member being an endless member mounted on said wheel means for movement through back and forth paths within the oven, the friction plate being located on at least one of said wheel means.

Claim 4

The invention of claim 1, each said parison holding means comprising a pin fixed at its lower portion to the said elongaged endless member, and a parison holder removably mounted on the top of said pin.

Claim 5

The invention of claim 3, said pin being removably attached to a vertical rod part of the endless member.

Claim 6

The invention of claim 1, wherein the said conveyor is an endless chain having links connected together by vertical rod parts located with their centers spaced approximately one-half inch apart, each said rod part being constructed to removably hold means for supporting a parison.

Claim 7

An oven for heating parisons comprising: a conveyor for carrying said parisons along a path through an oven, said conveyor including an elongated member extending along said path through the oven, parison holding means fixed on the elongated member for holding parisons in an upright position, means for directing heated air through the oven to heat the parisons, a turning means for periodically turning the parisons about their own axes as they travel through the oven, whereby the parisons are heated more uniformly, each said parison holding means comprising a pin fixed at its lower portion to a rod part of the elongated member and having a parison holder mounted at its upper portion, and including a dust cover means for protecting a portion of the elongated member extending over a straight part of said path, the dust cover means comprising a pair of generally vertical plates arranged on each side of the elongated member, the tops of the plates being turned inwardly towards each other at a height at which the pins and the rod parts are connected, leaving a slot through which the said rod parts project as the parison holders travel along said path.

Claim 8

An oven for heating parisons comprising: a conveyor for carrying said parisons along a path through an oven, said conveyor including an elongated member extending along said path through the oven, parison holding means fixed on the elongated member for holding parisons in an upright position, means for directing heated air through the oven to heat the parisons, a turning means for periodically turning the parisons about their own axes as they travel through the oven, whereby the parisons are heated more uniformly, each said parison holding means comprising a pin fixed at its lower portion to a rod part of the elongated member and having a parison holder mounted at its upper portion, and including a dust cover means for protecting a portion of the elongated member extending over a straight part of said path, the dust cover means comprising a pair of generally vertical plates arranged on each side of the elongated member, the tops of the plates being turned inwardly towards each other at a height at which the pins and the rod parts are connected, leaving a slot through which the said rod parts project as the parison holders travel along said path.

Claim 9

The invention of claim 6, said parison holding means including a star wheel mounted co-axially with the parisons at the upper portion of said rod, and said turning means comprising a plurality of fixed elements attached to the side of one of the plates of the dustcover means and spaced along the said paths, said elements being positioned to be engaged by the star wheel as it moves along the paths to turn the star wheel, and hence turn the parisons about their axes.

Claim 10

In an oven for heating parisons for a blow molding machine, said oven comprising an elongated conveying means for carrying parisons through the oven, said conveying means including a plurality of parison holding members rotatable to rotate the parisons about their axes, said parison holding members including a star wheel mounted co-axially with the parisons, projections on which star wheel extend outwardly to a given radial distance from its axis, and a means for rotating the said rotatable members about their axes comprising a plurality of fixed upright elements spaced along the side of said path and positioned within the said given radius to be engaged by the star wheel projections as the star wheel moves by the said elements to turn the star wheel, and hence turn the parisons about tHeir axes, and including a spring means for resiliently connecting the fixed upright element to the oven.

Claim 11

In an oven for heating parisons for a blow molding machine, said oven comprising an elongated conveying means for carrying parisons through the oven, said conveying means including a plurality of parison holding members rotatable to rotate the parisons about their axes, said parison holding members including a star wheel mounted co-axially with the parisons, projections on which star wheel extend outwardly to a given radial distance from its axis, and a means for rotating the said rotatable members about their axes comprising a plurality of fixed upright elements spaced along the side of said path and positioned within the said given radius to be engaged by the star wheel projections as the star wheel moves by the said elements to turn the star wheel, and hence turn the parisons about tHeir axes, and including a spring means for resiliently connecting the fixed upright element to the oven.

Claim 12

The invention of claim 8, wherein each parison holding means comprises a vertically extending rod structure, said rod structure being partially disposed in the conveying means and the parison holding member being removably mounted on the rod.

Claim 13

The invention of claim 8, said conveying means being a conveyor chain and including a dust cover comprising plates located on each side of the conveyor chain and said fixed elements being resiliently connected to said dust cover and extending upwardly therefrom.

Claim 14

In an oven for heating parisons, said oven comprising a base portion in which is disposed a conveyor chain, a plurality of apertures in said conveyor chain, a parison holding structure comprising a plurality of elongated rods disposed vertically in said corresponding apertures in said conveyor chain, a plurality of parison holding members rotatable about their axes relative to said parison holding structure and being disposed above the conveyor chain, said rotatable member being in spaced relation with the conveyor chain, turning means for engaging the rotatable member to rotate it and hence rotate the parisons about their axes, said turning means comprising a plurality of stationary fixed elements extending upwardly, said parison holding member including a disc having a plurality of fingers extending outwardly therefrom, the fixed elements and the holding finger member being positioned such that as the holding members move along the conveyor chain, the said fingers engage the fixed elements to turn the parison holders and hence turn the parisons about their axes, and including a dust cover comprising plates located one on each side of the conveyor chain, the fixed elements connected to and extending upwardly from the said dust cover plates.

Claim 15

In an oven for heating parisons, said oven comprising a base portion in which is disposed a conveyor chain, a plurality of apertures in said conveyor chain, a parison holding structure comprising a plurality of elongated rods disposed vertically in said corresponding apertures in said conveyor chain, a plurality of parison holding members rotatable about their axes relative to said parison holding structure and being disposed above the conveyor chain, said rotatable member being in spaced relation with the conveyor chain, turning means for engaging the rotatable member to rotate it and hence rotate the parisons about their axes, said turning means comprising a plurality of stationary fixed elements extending upwardly, said parison holding member including a disc having a plurality of fingers extending outwardly therefrom, the fixed elements and the holding finger member being positioned such that as the holding members move along the conveyor chain, the said fingers engage the fixed elements to turn the parison holders and hence turn the parisons about their axes, and including a dust cover comprising plates located one on each side of the conveyor chain, the fixed elements connected to and extending upwardly from the said dust cover plates.