CA1044417A - Molding apparatus with temperature compensating core rods - Google Patents
Molding apparatus with temperature compensating core rodsInfo
- Publication number
- CA1044417A CA1044417A CA217,058A CA217058A CA1044417A CA 1044417 A CA1044417 A CA 1044417A CA 217058 A CA217058 A CA 217058A CA 1044417 A CA1044417 A CA 1044417A
- Authority
- CA
- Canada
- Prior art keywords
- core rod
- core
- bushing
- head
- core rods
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
MOLDING APPARATUS WITH TEMPERATURE
COMPENSATING CORE RODS
ABSTRACT OF THE DISCLOSURE
This molding apparatus has a head which carries a plurality of core rods extending from the face of the head, and it has each core rod carried by a floating support that permits movement of the core rods closer together or further apart. Core rods are held in bushings which have flanges that maintain the core rods parallel to one another. The movement permits the spacing of the core rods to change as necessary to compensate for changes in the spacing of the mold cavities as temperature differences between the mold and the head that carries the core rods caused the core rods and mold cavities to have different center line spacings.
COMPENSATING CORE RODS
ABSTRACT OF THE DISCLOSURE
This molding apparatus has a head which carries a plurality of core rods extending from the face of the head, and it has each core rod carried by a floating support that permits movement of the core rods closer together or further apart. Core rods are held in bushings which have flanges that maintain the core rods parallel to one another. The movement permits the spacing of the core rods to change as necessary to compensate for changes in the spacing of the mold cavities as temperature differences between the mold and the head that carries the core rods caused the core rods and mold cavities to have different center line spacings.
Description
1044417 ' I
Molding machines which have multi-cavity molds and a plurality of core rods carried by a supporting head encounter a problem as the mold temperature increases substantially above that o~ the head that carries the core rods. Even though the center line spacing of the mold cavities is exactly the same as that o~ the core rods when the mold and head are at the same temperature, the cavity spacings become somewhat greater than the core rod spacings when the mold becomes heated to a substantially higher temperature than ~` 10 the core rod holder. When the mold closes on the core rods, the end core rods are forced out of parallelism and one side of the molded article is made thicker than the other side.
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` This problem is particularly acute w`ith blow molding ' -apparatus which utilizes an indexing head having a plurality of angularly spaced ~aces and molds located at angular spacing corresponding to the angluar relation of the faces of the turret head. Such machines have an injection mold where a parison is applied ~o the core rods and where the -temperature i6 ~xtremely high. The indexing head which ~' 20 carries the core rod holders is at or close to ambient temperature of the environment in which the molding appara-tus is being used. The indexing head carries the coated core rods to a blowing mold which operates at a lower tem~
perature than the injection mold but still at a temperature substantially more than ambient.
. -This invention attaches the core rods to the head ~ with bearing means that hold the core rods parallel to one -',f another but which permit a limited movement of the core rods f with respect to the head and with respect to one another -~ `
. ~ , . . .
' -2- ~ c , ,' ; , `, 1(~4~4~7 in directions normal to the axes of the core rods so that when the mold closes on core rods which are not at exactly the same spacings as the mold cavities, the closing of the mold moves the core rods laterally to correspond to the spacing of the cavities while the parallelism of the core rods is maintained.
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In the preferred construction, the core rods fit ~nto bushings, and each bushing has a circumferential flange which fits into a counterbore having a diameter somewhat greater than the diameter of the flange. The opening in the core rod holder through which the bushing extends also has a diameter somewhat larger than the outside diameter of the bus~ing. This permits the core rod holder and ; bushin~ to move as a unit in directions radially and ^ normal to the axis of the bushing and core rod. A cover -element closes the otherwise open end of the counterbore and contacts with the face of the flange which is on the opposite side o~ the face which contacts with the counter-bore. The flange is th~s held in a groove which permits radial move~ent but prevents any canting o~ the flange ` which would permit the core rod to move out of parallelism with other core rods.
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Core rods are held against axial movement by retainers which fit into circumferential grooves in the core rods in accordance with conventional practice. The holder in J
which the core rod bushings are supported are preferably made with a plurality of plates connected together by fastening means and correlated in such a way that they can be connected with the indexing head or removed and replaced by other plates for receiving core rods of different ~ 3- !
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sizes as may be necessary for different molds, depending upon the article to be produced.
Other objects, features and advantages of the invention will appear or be pointed out as the description proceeds.
In the drawing, forming a p~rt hereof, in which like reference characters indicate corresponding parts and all the views;
FIG. 1 is a fragmentary diagrammatic view of a blow molding machine viewed from the top so as to show the in-dexing head on which the core rods are carried and the molds with which the core rods cooperate;
FIG. 2 is a fragmentary, greatly enlarged, front view :~ of one face of the indexing head as shown in FIG. l; --FIG. 3 is a fragmentary front view of a portion of the structure shown in FIG. 2 but with the retaining means removed;
FIG. 4 is a sectional view ta~en on the lines 4-4 of FIG. 3 and with a core rod located in the holder;
FIGS.5-~ are sectional views ta~en on the lines 5-5~ .
6-6; 7-7; and ~-~, respectively, of FIG. 3, the sectional views ~eing somewhat enlarged for clearer illustration; and `
FIG. 9 is a diagrammatic viewshowing the way in which the core rod spacing is adjusted by the closing OI a mold.
. Fig. 1 shows a molding apparatus with a center shaft 10 which carries an ~ndexing head 12 that has three faces, each , of which supports a core rod holder 14.. In the construction illus~rated, there are five core rods 16 pro~ect~ng from each ~ 1 .. . . . . .
'` 10444~7 of the faces of the indexing head for success~ve cooperation with an injection mold 1~ and a blowing mold 20.
The indexing head is rotated about the axis of the shaft 10 and moves 120 degrees with each operation. This permits the core rods 16 which have received their parisons to be carried to the blowing mold 20 while the core rods 16 which have been blown move to the lowermost position in Fig. 1 which constitutes a stripping station. CQre rods from ` which blown articles have been stripped move from the stripping station to the injection mold lg in accordance with conventional practice. Such molding apparatus is ` well-known and no further description of it is necessary for a complete understanding of this invention. It will be understood, however, that the invention herein described ~ is not limited to blow molding machines of the type shown - in Fig. l; but can be used with any type of molding apparatus where a plurality of core rods are used in multi-cavity molds and are carried by a common head.
The core rod holder 14 is best shown in Figs. 2 and 4. ~-In Fig. 2 there is no core rod in the holder, whereas Fig.
4 shows the end of a core rod 16 located in the holder.
Fig. 4 shows a frame 26 which comprises one~of the sides of the indexing head 12. The frame 26 has an out-~ side face 2~ to which the core rod holder 14 is connected.
j The core rod holder includes a mounting plate 30 which is ~ secured to the frame 26 by screws 32, best shown in Figs. 3 ., and 6.
In front of the mounting plate 30, there is a second ;-~l plate 36 which is attached to the mounting plate by screws 3o 3g, be~t shown in Figs. 3 and ~.
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49~,417,, A third plate 40 is attached to the second plate 36 by screws ~2, shown in Figs. 3, ~ and 5. An opening ~6 ex-tends through the second and third plates 36 and ~0, res-pectively, and preferably through the mounting plate 30 also.
A bushing 4~ extends through the opening 46 and the out-side diameter of the bushing ~g is somewhat s~aller than the diameter of the opening ~6 so that there is a clearance 50 between the bushin~ 4~ and the surface of the opening 46 when the bushing is centered in the opening 46.
; 10 The bushing 4~ is preferably made in two sections. The right-hand section, in Fig. 4, has a flange 52 at its left-` hand end, and left-hand section of the bushing 4g has a flange 5~ at its right-hand end.
The flange 52 is located in a counterbore 5g at the `~ end of the portion of the opening 46, which extends through ~i the second plate 36. The flange 5~ is located in a comple-;1 mentary counterbore in the end of the portion of the open-ing 46 that extends throug~ the third plate 40. It will thus be evident that the counterbore in either of these ' 20 plates 36 and 40 could be made deeper so as to receive both . ~`
of the flanges 54 and 52. It will also be evident that the ~ bushing ~ could be made in just one section with an in-`~ tegral one-piece flange on the outside of the bushing and at a location midway between the ends of the bushing as i are the flanges j4 and 52. The construction illustrated -~ is representative of a counterbore for receiving a flange of the bushing ~ with a cover plate that holds the flange against the end of the counterbore. The construction thus provides a groove into which the flanges of the bushing fit ,, , ;. i " ~ , , : , ;, ' ,: ~ , . . . !
-; ' ' ' ,',.' '. ' '., , ' '", "" ' , ' , :" ',.;; ': , -4~7 and are held against canting movement by the surfaces of the plates 36 and ~0 contacting with the flanges 54 and 52 with running clearance between the confronting faces of the plates and the flanges so that the flanges can move on the plates 36 and 40, as bearin~s or bearing surfaces, in directions in a plane normal to the longitudinal axis of the bushing ~g.
The flanges cannot tilt, however, so as to permit the bushing 4~ to move out of its parallel relationship with other bush-ings of the core rod holder.
The counterbore 5~ and the complementary counterbore in the plate 40 form a circum~erential groove which has a diameter slightly greater than the outside diameter of the flanges 54 and 52 by an amount at least great enough to permit the bushing 4~ to move to its limits of travel within ~^ the oversize opening 46 through which the bushing passes.
-~ It will be evident that this construction permits movement of the bushing ~ normalto its axis in any direction but main-tains the axis of the bushin~ a~ainst any tilting movement.
~ The core rod 16 has an end portion which fits snugly in .. e~ 20 the bushing 4~; and in the construction illustrated, the end of the core rod bottoms a~ainst the face 2~ of the rame 26 of the indexing head 12. The core rod 16 is re-tained in the holder 1~ by retaining means comprising two -retaining elements 64 and 66 ~Fig. 2 and Fi~. 4) which have arcuate portions 6~ that extend into a groove 70 formed in the circum~erence of the core rod 16. The core rod retainers 6~ and 66 are secured to the third plate ~0 by screws 74, which thread into the third plate 40. These screws 74 ex-tend through slots 76 in the retainer elements 64 and 66 so that the retainer elements can be adjusted toward and from one another to determine the distance that they extend .
.
~: , .. .. . . .
1044~7 into the groove 70 (Fig. ~) in the core rod 16. Since the retainer elements 64 and 66 are fixedly secured to the core rod holder 1~, when the holding apparatus is in operation, it is necessary to have sufficient clearance between the arcuate edges 6~ of the retainers 6~ and 66 and the bottom of the groove 70 sufficient to permit the core rod to move with the bushing without having the bottom of the groove 70 contact with the arcuate edges 6~.
Fig. 9 is a diagrammatic view showing the way in which the core rods 16 have their spacing adjusted by the closing of the mold 1~. This mold has a lower section l~A which may be fixed, and an upper section l~B which moves toward and from the lower section l~A. The core rods 16 move upward one-half as much as the upper mold section 1~3 and far enough to clear the ends of the cavities g2, ~3 and . Fig. 9 shows the ~old 1~ partially closed.
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~ he center line spacings o~ the core rods 16 is indi-cated by the dimension arr~w A. The center line spacing of the ends o~ the cavities is indicated by the dimes~ional arrow B. Because of the higher temperature, and resulting -~ expansion, of the mold 1~, the dimension B is somewhat ` greater than A. Thus, with the center core rod 16 located " -in alignment with the center of the cavity ~3, the core rod 16 at the cavity ~4 will be off-center towards the left;
and the core rod 16 for the mold cavity ~2 will be off-center toward the right.
Because of the fact that these off-center distances amount to only a few thousandths of an inch, the sides of the core rods 16, which are off-center, come against the sides of the mold cavity somewhat below a horizontal I -.' ..
~;; . . . , , , ., ,, ; ' , ,: ,, . . , . , -:
. ~
1~44~17 -. center line through the core rods, but substantially removed from a vertical line through the core rods, so that the con-tact of the core rods with the sides of the respe~ti~e cavities exerts a camming action which thrusts the core rods progressively closer to the center of the mold cavity as the mold closes. This camming action or side thrust on the core rods causes the bushing 4~ (Fig. 4) to move sideways in the counterbore 5~ to increase the center line spacing between the core rods without interfering with parallel relation-ship to one another.
The preferred embodiment of the invention has been illustrated and described, but changes and modifications can be madet and some features can be used in different combinations without departing from the invention as de-` fined in the claims.
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, .
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Molding machines which have multi-cavity molds and a plurality of core rods carried by a supporting head encounter a problem as the mold temperature increases substantially above that o~ the head that carries the core rods. Even though the center line spacing of the mold cavities is exactly the same as that o~ the core rods when the mold and head are at the same temperature, the cavity spacings become somewhat greater than the core rod spacings when the mold becomes heated to a substantially higher temperature than ~` 10 the core rod holder. When the mold closes on the core rods, the end core rods are forced out of parallelism and one side of the molded article is made thicker than the other side.
.
` This problem is particularly acute w`ith blow molding ' -apparatus which utilizes an indexing head having a plurality of angularly spaced ~aces and molds located at angular spacing corresponding to the angluar relation of the faces of the turret head. Such machines have an injection mold where a parison is applied ~o the core rods and where the -temperature i6 ~xtremely high. The indexing head which ~' 20 carries the core rod holders is at or close to ambient temperature of the environment in which the molding appara-tus is being used. The indexing head carries the coated core rods to a blowing mold which operates at a lower tem~
perature than the injection mold but still at a temperature substantially more than ambient.
. -This invention attaches the core rods to the head ~ with bearing means that hold the core rods parallel to one -',f another but which permit a limited movement of the core rods f with respect to the head and with respect to one another -~ `
. ~ , . . .
' -2- ~ c , ,' ; , `, 1(~4~4~7 in directions normal to the axes of the core rods so that when the mold closes on core rods which are not at exactly the same spacings as the mold cavities, the closing of the mold moves the core rods laterally to correspond to the spacing of the cavities while the parallelism of the core rods is maintained.
;
In the preferred construction, the core rods fit ~nto bushings, and each bushing has a circumferential flange which fits into a counterbore having a diameter somewhat greater than the diameter of the flange. The opening in the core rod holder through which the bushing extends also has a diameter somewhat larger than the outside diameter of the bus~ing. This permits the core rod holder and ; bushin~ to move as a unit in directions radially and ^ normal to the axis of the bushing and core rod. A cover -element closes the otherwise open end of the counterbore and contacts with the face of the flange which is on the opposite side o~ the face which contacts with the counter-bore. The flange is th~s held in a groove which permits radial move~ent but prevents any canting o~ the flange ` which would permit the core rod to move out of parallelism with other core rods.
.
Core rods are held against axial movement by retainers which fit into circumferential grooves in the core rods in accordance with conventional practice. The holder in J
which the core rod bushings are supported are preferably made with a plurality of plates connected together by fastening means and correlated in such a way that they can be connected with the indexing head or removed and replaced by other plates for receiving core rods of different ~ 3- !
~(~44g~7 .
sizes as may be necessary for different molds, depending upon the article to be produced.
Other objects, features and advantages of the invention will appear or be pointed out as the description proceeds.
In the drawing, forming a p~rt hereof, in which like reference characters indicate corresponding parts and all the views;
FIG. 1 is a fragmentary diagrammatic view of a blow molding machine viewed from the top so as to show the in-dexing head on which the core rods are carried and the molds with which the core rods cooperate;
FIG. 2 is a fragmentary, greatly enlarged, front view :~ of one face of the indexing head as shown in FIG. l; --FIG. 3 is a fragmentary front view of a portion of the structure shown in FIG. 2 but with the retaining means removed;
FIG. 4 is a sectional view ta~en on the lines 4-4 of FIG. 3 and with a core rod located in the holder;
FIGS.5-~ are sectional views ta~en on the lines 5-5~ .
6-6; 7-7; and ~-~, respectively, of FIG. 3, the sectional views ~eing somewhat enlarged for clearer illustration; and `
FIG. 9 is a diagrammatic viewshowing the way in which the core rod spacing is adjusted by the closing OI a mold.
. Fig. 1 shows a molding apparatus with a center shaft 10 which carries an ~ndexing head 12 that has three faces, each , of which supports a core rod holder 14.. In the construction illus~rated, there are five core rods 16 pro~ect~ng from each ~ 1 .. . . . . .
'` 10444~7 of the faces of the indexing head for success~ve cooperation with an injection mold 1~ and a blowing mold 20.
The indexing head is rotated about the axis of the shaft 10 and moves 120 degrees with each operation. This permits the core rods 16 which have received their parisons to be carried to the blowing mold 20 while the core rods 16 which have been blown move to the lowermost position in Fig. 1 which constitutes a stripping station. CQre rods from ` which blown articles have been stripped move from the stripping station to the injection mold lg in accordance with conventional practice. Such molding apparatus is ` well-known and no further description of it is necessary for a complete understanding of this invention. It will be understood, however, that the invention herein described ~ is not limited to blow molding machines of the type shown - in Fig. l; but can be used with any type of molding apparatus where a plurality of core rods are used in multi-cavity molds and are carried by a common head.
The core rod holder 14 is best shown in Figs. 2 and 4. ~-In Fig. 2 there is no core rod in the holder, whereas Fig.
4 shows the end of a core rod 16 located in the holder.
Fig. 4 shows a frame 26 which comprises one~of the sides of the indexing head 12. The frame 26 has an out-~ side face 2~ to which the core rod holder 14 is connected.
j The core rod holder includes a mounting plate 30 which is ~ secured to the frame 26 by screws 32, best shown in Figs. 3 ., and 6.
In front of the mounting plate 30, there is a second ;-~l plate 36 which is attached to the mounting plate by screws 3o 3g, be~t shown in Figs. 3 and ~.
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49~,417,, A third plate 40 is attached to the second plate 36 by screws ~2, shown in Figs. 3, ~ and 5. An opening ~6 ex-tends through the second and third plates 36 and ~0, res-pectively, and preferably through the mounting plate 30 also.
A bushing 4~ extends through the opening 46 and the out-side diameter of the bushing ~g is somewhat s~aller than the diameter of the opening ~6 so that there is a clearance 50 between the bushin~ 4~ and the surface of the opening 46 when the bushing is centered in the opening 46.
; 10 The bushing 4~ is preferably made in two sections. The right-hand section, in Fig. 4, has a flange 52 at its left-` hand end, and left-hand section of the bushing 4g has a flange 5~ at its right-hand end.
The flange 52 is located in a counterbore 5g at the `~ end of the portion of the opening 46, which extends through ~i the second plate 36. The flange 5~ is located in a comple-;1 mentary counterbore in the end of the portion of the open-ing 46 that extends throug~ the third plate 40. It will thus be evident that the counterbore in either of these ' 20 plates 36 and 40 could be made deeper so as to receive both . ~`
of the flanges 54 and 52. It will also be evident that the ~ bushing ~ could be made in just one section with an in-`~ tegral one-piece flange on the outside of the bushing and at a location midway between the ends of the bushing as i are the flanges j4 and 52. The construction illustrated -~ is representative of a counterbore for receiving a flange of the bushing ~ with a cover plate that holds the flange against the end of the counterbore. The construction thus provides a groove into which the flanges of the bushing fit ,, , ;. i " ~ , , : , ;, ' ,: ~ , . . . !
-; ' ' ' ,',.' '. ' '., , ' '", "" ' , ' , :" ',.;; ': , -4~7 and are held against canting movement by the surfaces of the plates 36 and ~0 contacting with the flanges 54 and 52 with running clearance between the confronting faces of the plates and the flanges so that the flanges can move on the plates 36 and 40, as bearin~s or bearing surfaces, in directions in a plane normal to the longitudinal axis of the bushing ~g.
The flanges cannot tilt, however, so as to permit the bushing 4~ to move out of its parallel relationship with other bush-ings of the core rod holder.
The counterbore 5~ and the complementary counterbore in the plate 40 form a circum~erential groove which has a diameter slightly greater than the outside diameter of the flanges 54 and 52 by an amount at least great enough to permit the bushing 4~ to move to its limits of travel within ~^ the oversize opening 46 through which the bushing passes.
-~ It will be evident that this construction permits movement of the bushing ~ normalto its axis in any direction but main-tains the axis of the bushin~ a~ainst any tilting movement.
~ The core rod 16 has an end portion which fits snugly in .. e~ 20 the bushing 4~; and in the construction illustrated, the end of the core rod bottoms a~ainst the face 2~ of the rame 26 of the indexing head 12. The core rod 16 is re-tained in the holder 1~ by retaining means comprising two -retaining elements 64 and 66 ~Fig. 2 and Fi~. 4) which have arcuate portions 6~ that extend into a groove 70 formed in the circum~erence of the core rod 16. The core rod retainers 6~ and 66 are secured to the third plate ~0 by screws 74, which thread into the third plate 40. These screws 74 ex-tend through slots 76 in the retainer elements 64 and 66 so that the retainer elements can be adjusted toward and from one another to determine the distance that they extend .
.
~: , .. .. . . .
1044~7 into the groove 70 (Fig. ~) in the core rod 16. Since the retainer elements 64 and 66 are fixedly secured to the core rod holder 1~, when the holding apparatus is in operation, it is necessary to have sufficient clearance between the arcuate edges 6~ of the retainers 6~ and 66 and the bottom of the groove 70 sufficient to permit the core rod to move with the bushing without having the bottom of the groove 70 contact with the arcuate edges 6~.
Fig. 9 is a diagrammatic view showing the way in which the core rods 16 have their spacing adjusted by the closing of the mold 1~. This mold has a lower section l~A which may be fixed, and an upper section l~B which moves toward and from the lower section l~A. The core rods 16 move upward one-half as much as the upper mold section 1~3 and far enough to clear the ends of the cavities g2, ~3 and . Fig. 9 shows the ~old 1~ partially closed.
......................................................................... .
~ he center line spacings o~ the core rods 16 is indi-cated by the dimension arr~w A. The center line spacing of the ends o~ the cavities is indicated by the dimes~ional arrow B. Because of the higher temperature, and resulting -~ expansion, of the mold 1~, the dimension B is somewhat ` greater than A. Thus, with the center core rod 16 located " -in alignment with the center of the cavity ~3, the core rod 16 at the cavity ~4 will be off-center towards the left;
and the core rod 16 for the mold cavity ~2 will be off-center toward the right.
Because of the fact that these off-center distances amount to only a few thousandths of an inch, the sides of the core rods 16, which are off-center, come against the sides of the mold cavity somewhat below a horizontal I -.' ..
~;; . . . , , , ., ,, ; ' , ,: ,, . . , . , -:
. ~
1~44~17 -. center line through the core rods, but substantially removed from a vertical line through the core rods, so that the con-tact of the core rods with the sides of the respe~ti~e cavities exerts a camming action which thrusts the core rods progressively closer to the center of the mold cavity as the mold closes. This camming action or side thrust on the core rods causes the bushing 4~ (Fig. 4) to move sideways in the counterbore 5~ to increase the center line spacing between the core rods without interfering with parallel relation-ship to one another.
The preferred embodiment of the invention has been illustrated and described, but changes and modifications can be madet and some features can be used in different combinations without departing from the invention as de-` fined in the claims.
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.', .
, .
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Claims (9)
1. Molding apparatus including a head having a side face, a mold adjacent to said face and having spaced apart open-ings opposing said face, core rods carried by the head and projecting therefrom for extending into said openings in the mold, holders carried by the head for supporting the core rods, and bearings on the holders and on the core rods, said bearings having surfaces confronting one another and extend-ing substantially normal to longitudinal axes of the core rods for holding the core rods that extend from said face in parallel relation to one another, the bearing surfaces having relative movement with respect to one another and with respect to the head normal to said axes for changing the spacings of the core rods from one another to compensate for differences between the temperature of the head and the temperature of the mold and the resulting changes in the spacings of the openings in the mold into which the core rods must extend.
2. The molding apparatus described in claim 1, charac-terized by the head being an indexing head and having bearing means in which it is movable angularly about a center axis, and having a plurality of side faces at angularly spaced locations around said axis, and a plurality of molds located around the center axis adjacent to the respective faces of the indexing head, the angular spacing of the molds from one another being substantially equal to those of the faces of the head, each of the faces of the indexing head having a holder and a plurality of core rods extending therefrom and with independent bearings for each of the core rods.
3. The molding apparatus described in claim 1, charac-terized by each of the core rods including a bushing through which the rest of the core rod extends, a flange extending from each bushing in a direction substantially normal to the longitudinal axis of the bushing, said bearings including a bearing on the holder into which the flange of each core rod fits with a running clearance and in which the flange is movable in directions normal to the longitudinal axis of the core rod.
4. The molding apparatus described in claim 1, charac-terized by a shoulder on the core rod, and said bearings including retaining means for the core rods carried by the holder and cooperating with the shoulder on the core rod to prevent the core rod from moving axially out of the holder.
5. The molding apparatus described in claim 4, charac-terized by the retaining means comprising two retaining elements, the shoulder on the core rod extending around the circumference of the core rod, and detachable fastening means for holding the retaining elements in position after they have been brought into cooperative relation with the shoulder by movement in the direction of radii of the core rod.
6. The molding apparatus described in claim 5, charac-terized by a circumferential groove in the core rod, the sides of which provide two shoulders on the core rod, the retaining elements comprising plates of a thickness to fit into the core rod groove with a snug fit to prevent axial movement of the core rod in either direction.
7. The molding apparatus described in claim 1, charac-terized by the core rod including a bushing through which the rest of the core rod extends, a flange extending from the outside of the bushing, an opening in the holder and through which the bushing extends, a counterbore at one end of the opening in the holder for receiving the flange, and a cover element of the holder that covers the side of the flange at the otherwise open end of the counterbore, the diameter of the opening through which the bushing extends being somewhat larger than the diameter of the bushing, and the diameter of the counterbore being somewhat larger than the outside diameter of the flange, whereby the bushing, flange and core rod are free to move radially with respect to the head and within the limits imposed by the differences in diameters of the parts.
8. The molding apparatus described in claim 7, cha-racterized by the bushing being in two sections with a flange at the end of each section, the two sections being oriented so that their flanges are at adjacent ends, and at an inter-mediate location between the opposite ends of the entire bushing, and the cover element being continuous across a face of the head and having a plurality of spaced openings for receiving a plurality of core rods.
9. The molding apparatus described in claim 9, cha-racterized by the holder including a mounting plate and detachable fastening means securing the mounting plate to the face of the head, a second plate detachably connected to the mounting plate, said second plate being the plate through which the opening with the counterbore extends, a third plate which is the cover element and which has a core-receiving opening with a counterbore that faces the counterbore of the second plate to form a circumferential groove for receiving the flanges of the two sections of the bushing, said sections of the bushing being held in alignment with one another by the portion of the core rod that extends through the openings through the bushing and through the second and third plates and through a corresponding aligned opening in the mounting plate, a circumferential groove in the core rod at the face of the third plate which is remote from the second plate, retainer elements attached to the third plate with arcuate edge portions that fit into the circumferential groove of the core rod, screws that hold the retaining means on the third plate, said screws extending through the slots in the retaining means, so that the re-taining means can be adjusted toward and from one another to control the extent of the retaining means into the circum-ferential groove and thus provide clearance for movement of the core rod with respect to the retaining means in directions normal to the axis of the core rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA217,058A CA1044417A (en) | 1974-12-30 | 1974-12-30 | Molding apparatus with temperature compensating core rods |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA217,058A CA1044417A (en) | 1974-12-30 | 1974-12-30 | Molding apparatus with temperature compensating core rods |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1044417A true CA1044417A (en) | 1978-12-19 |
Family
ID=4101952
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA217,058A Expired CA1044417A (en) | 1974-12-30 | 1974-12-30 | Molding apparatus with temperature compensating core rods |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1044417A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2985130B1 (en) | 2014-08-13 | 2018-02-07 | Krones AG | Forming device and method for forming plastic preforms into plastic containers |
| CN114302800A (en) * | 2019-08-08 | 2022-04-08 | 日精Asb机械株式会社 | Mold unit, blow molding device, and blow molding method |
-
1974
- 1974-12-30 CA CA217,058A patent/CA1044417A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2985130B1 (en) | 2014-08-13 | 2018-02-07 | Krones AG | Forming device and method for forming plastic preforms into plastic containers |
| EP2985130B2 (en) † | 2014-08-13 | 2022-07-06 | Krones AG | Forming device for forming plastic preforms into plastic containers |
| CN114302800A (en) * | 2019-08-08 | 2022-04-08 | 日精Asb机械株式会社 | Mold unit, blow molding device, and blow molding method |
| CN114302800B (en) * | 2019-08-08 | 2024-01-12 | 日精Asb机械株式会社 | Mold unit, blow molding device, and blow molding method |
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