US3798019A

US3798019A - Mold holder arm and insert opening mechanism

Info

Publication number: US3798019A
Application number: US00255460A
Authority: US
Inventors: W Bystrianyk; A Federko; A Trahan
Original assignee: Newfrey LLC
Current assignee: Newfrey LLC
Priority date: 1972-05-22
Filing date: 1972-05-22
Publication date: 1974-03-19
Anticipated expiration: 1991-03-19
Also published as: DE2324277C3; JPS4955706A; AU5454473A; DE2324277B2; JPS5314087B2; GB1418054A; FR2185595A1; CA990956A; DE2324277A1; AU450903B2; IT986308B; FR2185595B1; IN138582B

Abstract

A glassware forming machine has mold holder arms pivotally mounted on a common hinge pin, and a conventional rock shaft and crank opens and closes each of these arms through a short link pivotally connecting the arm to the crank. The angular displacements of these arms are limited by the geometry of a conventional glassware forming machine, and in order to blow larger size ware the present invention contemplates subjecting the split molds, which are pivotally carried on these arms, to a cocking motion as the arms are opened. An interconnecting link acts on the molds and operates off the crank. The interconnecting link operates when the mold holder arms are open, but does not interfere with the normal mold closing motion. An alternative configuration is shown for the blank mold side of an I. S. machine to increase the clearance for the neck ring arm during revert motion, and to allow longer parisons to be reverted.

Description

United States Patent [191 Bystrianyk et al.

[ MOLD HOLDER ARM AND INSERT OPENING MECHANISM [75] Inventors: Wasyl Bystrianyk, Simsbury;

' Andrew S. F ederko, Bloomfield; Albert J. Trahan, Vernon, all of Conn.

[73] Assignee: Emhart Corporation, Bloomfield,

Conn.

221 Filed: May 22, 1972 211 Appl.No.: 255,460

[ Mar. 19, 1974 Primary Examiner-Arthur D. Kellogg Attorney, Agent, or FirmMcCormick, Paulding &

Huber 5 7 ABSTRACT A glassware forming machine has mold holder arms pivotally mounted on a common hinge pin, and a conventional rock shaft and crank opens and closes each of these arms through a short link pivotally connecting the arm to the crank. The angular displacements of these arms are limited by the geometry of a conventional glassware forming machine, and in order to blow larger size ware the present invention contemplates subjecting the split molds, which are pivotally carried on these arms, to a cocking motion as the arms are opened. An interconnecting link acts on the molds and operates off the crank. The interconnecting link operates when the mold holder arms are open, but does not interfere with the normal mold closing motion. An alternative configuration is shown for the blank mold side of an I. S. machine to increase the clearance for the neck ring arm during revert motion, and to allow longer parisons to be reverted.

12 Claims, 7 Drawing Figures PATENTEUHAR 19 m4 3L798l0l 9 sum 1 or 4 PAIENTEBNAR 1 9 1914 3798.019

sum

3 or 4 PATENTEDHAR 1 9 I914 3L798L0 1 9 SHEEI u [If 4 FIG. 7

MOLD HOLDER ARM AND INSERT OPENING MECHANISM BACKGROUND OF THE INVENTION In existing glassware fomiing machines of the type wherein mold holder arms support split molds for pivotal movement between open and closed positions, the angular movement of these arms is limited because of the geometry of the machine, thereby limiting the size of glassware articles capable of being formed in such machines. This limit is dictated by the fact that the" newly formed glassware articles must be lifted upwardly out of the blow molds by take-out tongs or the like. Interference between the newly formed article and the shoulder of the split mold occurs even though the split molds are moved to open positions when articles above a particular size are to be formed. The present invention solves this problem by cocking the split molds during opening movement of the mold holder arms to increase the clearance in the area adjacent the hinge pin upon which the arms are mounted. An alternative configuration solves a related problem in the blank mold side of a typical I. 5. machine. The split blank molds are also cocked during opening movement of their mold arms to increase the clearance in the area adjacent the blank mold hinge pin.

Other attempts to increase clearance on the blow mold side have been proposed, and US. Pat. No. 3,642,462 issued to Thomas, Feb. 15, I972 shows one such approach to solving this problem, but the approach shown in this patent requires that a lower mold member, called the bottom plate," be physically moved from the position normally occupied by the bottom plate during forming of the glassware article, to an alternative position wherein newly formed articles are moved away from the hinge pin through a predetermined displacement prior to being taken out by the take-out tongs. This rather complex structure, shown in the Thomas patent, not only is more expensive then the straight-forward mechanism to be described herein, but in view of the fact that the motion of the take-out mechanism must be delayed, to allow cycle time for sliding the bottom plate, it will be apparent that some sacrifice must be made in the overall cycle time of the glassware forming machine in Thomas. The present invention provides a convenient mechanism for increasing the size of ware which can be formed on a conventional glassware forming machine without sacrifice to the time required for accomplishing a given machine cycle.

SUMMARY OF .THE INVENTION This invention relates generally to glassware forming machines of the type which include pivotally mounted split molds on arms provided on a common hinge pin axis, and deals more particularly with a novel linkage capable of cocking the split molds as they are opened so as to provide increased clearance between the inside corners of the split molds, located adjacent the hinge a crank arm on each rock shaft and a short link connecting the crank arm to a mold holder insert provided for this purpose on the mold holder arm and adapted to support the split mold on said mold holder. The inserts are mounted for limited floating movement relative to the respective arms. and thereby accommodate slight variation in the alignment of the individual split molds, as is necessary in a double or triple gob configuration.

In accordance with a preferred form the present invention, an interconnecting link is provided on the crank arm and serves to cock the insert as the mold holder arm reaches its open position so that the inner comers of the split molds located adjacent the hinge pin are spread a slightly greater distance apart then would be the case in a conventional glassware forming machine not equipped with an interconnecting link of the present invention. The inserts are provided with an elongated slot which receives a roller located at one end of the interconnecting link, and this roller bottoms out on the inner end of said slot when the mold holder arm reaches the open position causing this cocking motion of the insert. When the mold holder arm is moved to the closed position so that the split molds mate with one another, the roller only engages the sides of the slot, and the required free floating movement of the in sert relative to the mold holder arm is permitted. A spring is perferably provided so as to urge the insert toward a position opposite that of the cocked position referred to above. This spring thus assures that the insert is properly oriented during mold closing movement so as to avoid undue wear on the inner corners of the split molds.

In accordance with an alternative embodiment of the present invention the interconnecting link is pinned to the insert, and has a pin and slot connection to the crank arm so that the pin abuts one end of the slot during opening movement of the arms to achieve the said cocking motion of the insert, but which pin is free to move in said slot during closing movement of the arms to allow for the necessary floating of the mating split molds.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing one of two generally symetrical mold holder arms, together with an associated crank arm and rock shaft linkage, as well as an interconnecting link associated with the mold holder.

on the mold holder arm linkage.

FIG. 5 is a plan view showing one of two generally symmetrical mold holder arms together with an associated crank arm and rock shaft linkage, and an alternative form of interconnecting link for cocking the mold inserts during open-ing movement.

FIG. 6 is a view similar to FIG. 5 but shows the arm in its open position. 1 I

FIG. 7 is an enlarged sectional view taken on line 7-7 of FIG. 5.

DETAILED DESCRIPTION OF FIRST EMBODIMENT (FIGS. 1, 2, 3 AND 4) The description to follow when taken together with the above mentioned views can best be understood by reference to the Ingle US. Pat. No. 1,911,119 which describes the original version of a single gob Hartford I. S. glassware forming machine. While the present invention will be described with reference to a glassware forming machine of the I. 5. type, it will be apparent that the advantages to the present invention can also be realized in various other glassware forming machine environments.

Turning now to the drawings in greater detail, FIG. I shows a generally vertically oriented fixed hinge pin 10 of conventional construction, and this hinge pin 10 carries oppositely arranged generally symmetrically constructed

mold holder arms

12 and 16, which arms are adapted to be moved from the closed position shown in FIG. I, to the open position shown in FIG. 2, in the forming of glassware articles, such as those indicated generally at A and A in FIG. 2. Split molds, B and B, are mounted to each of these mold holder arms in a conventional fashion, as for example by the

support pins

14, 14. The molds shown in FIG. 2 comprise one-half of the complete double gob mold set, but it will be apparent that a symmetrically constructed mating pair of split molds are supported on the other arm 16. As so mounted, each split mold B is supported by a locating surface 18 on a mold insert member 20 which insert member, is itself mounted for limited pivotal floating movement to the associated mold' holder arm 12 by means of a pivot 22. Thus, limited pivotal floating movement of the insert 20 with respect to its associated mold holder arm is conventionally provided for to assure that the split molds B and B will be properly aligned with their mating split molds such as B in FIG. I, when the mold holder

arms

12 and 16 are moved to their closed position.

The

mold holder arms

12 and 16 are adapted to be moved between the open and closed position shown in FIGS. 2 and 1 respectively by driven rock shafts, one of which is shown at 26, which shafts are oscillated in a conventional fashion by an air cylinder (not shown) in timed relationship to other components of the machine such as the take-out mechanism which removes the newly formed ware from the FIG. 2 locations. The machine geometry limits mold holder arm movement to the angular displacement shown in FIGS. 1 and 2, and from FIG. 2 it will be apparent that split molds B and B move from the FIG. I closed position, wherein their mating surfaces lie on the axis 28, to an open position wherein these mating surfaces of the molds B and B might be expected to lie on the axis 30. However, as a result of the novel linkage mechanism to be described these molds B and B will be cocked from such a mold open position to the position shown in FIG. 2 wherein these molds and their associated insert 20 are cocked with respect to the mold holder arm 12.

Considering next the linkage means for pivotally moving the

mold holder arms

12 and 16, a driven rock shaft 26 is provided in spaced parallel relation to the hinge pin 10, and has associated therewith a crank arm 32. The crank arm 32 has a bifurcated end portion across which a pivot pin 34 extends so as to pivotally support a link 36. The link 36 is provided with a pivot pin 38, which pivot pin 38 is rotatably mounted in the mold holder arm 12. Thus, angular rotation of the rock shaft 26 causes the crank arm 32 to move the link 36 and to thereby achieve the mold holder arm opening and closing movement referred to above. This motion of the mold holder arm is conventional, and the mechanism for cocking the insert 20 with respect to the mold holder arm 12 in accordance with the present invention will now be described.

The insert 20 is provided on the mold holder arm 12 as shown in FIG. 4, and the pivot pin 22 permits angular movement of the insert 20 with respect to the mold holder arm 12 as described above. An interconnecting link 40 is provided between the insert 20 and the crank arm 32 so as to effect the cooking movement of the insert 20 with respect to its arm 12, but only during movement of the arm 12 not associated with the closed position shown in FIG. 1. This selective alteration of the movement associated with the insert 20 is achieved by reason of the pivotal pin and slot connection between the interconnecting link 40 and the insert 20.

In FIG. 1 the connection between the interconnecting link 40 and the insert 20 can be seen to comprise a pin 48 and an elongated slot 46 as shown generally at 42. The insert 20 includes an car 44 which defines the open end slot 46, which slot is elongated and oriented so that its longitudinal axis extends generally rearwardly and outwardly toward the rock shaft 26. This open end slot 46 slidably receives the pin 48 and more particularly a follower roller mounted at the lower end of said pin 48 as best shown in FIG. 4. The pin 48 is secured to one end of the interconnecting link 40, and the other end of said interconnecting link is pivotally mounted to the crank arm 32 by a cap screw 50. While the screw 50 is shown threadably received in the upper end portion 52 of the pivot pin 34, it will be apparent that this fortuitous location of the cap screw 50 is dietated by the geometry of the linkage associated with the opening and closing movement of the mold holder arm, and that this particular location for this end of the interconnecting link 40 is determined by the required radius of the crank 32 rather than by the location of the pin 34.

As so constructed and arranged, opening movement of the mold holder arm 12 caused by rotation of the crank 32 will cause the interconnecting link 40 to be moved from the FIG. 1 position to the FIG. 2 position and the follower roller, provided for this purpose at the lower end of the pin 48, bottoms on the inner end of the open end slot 46 in the insert 20, causing the required cocking motion of the insert 20 and its associated split molds B and B.

During closing movement of the

mold holder arms

12 and 16 the open end slot 46 will permit the interconnccting link 40 to move relative to the insert 20, so that the roller at the lower end of pin 48 moves away from the inner end of this slot 46. A tension spring is provided between the mold holder arm 12 and the pin 48 so as to urge the insert 20 toward a position dictated by the pin and slot means, indicated generally at 56 at least during closing movement of the molds. More particularly, said pin and slot means comprises a pin 58 provided in the mold holder arm 12, and an associated elongated slot 60 provided in the insert 20. The pin 58 will engage one end 62 of this slot 60 when the spring 54 exerts its force during closing movement of the mold holder arm 12 at least until the mating molds B and B" engage. As the mold holder arm 12 reaches its closed position, and the split molds B, B engage their mating split mold halves as shown in FIG. 1 at B" the pin 58 will move away from the end 62 of the slot 60 allowing the pivotal floating movement of the insert 20 with respect to the arm 12.

Thus, the spring 54 serves to rock the mold holder insert 20 and its associated split molds B and B in a direction opposite the cocking motion referred to above, and thereby reduces or eliminates any excessive wear caused by failing to return the mold holder insert 20 and its associated split molds to a position more closely approximating that which said components should occupy relative to their mold holder arm 12 as the split mold halves come together to the closed position shown in FIG. 1.

In conclusion then the primary object of the present invention is to permit an automatic cocking motion to be imparted to the split molds, B and B, so that the inner corners of the mating split molds B and B", as indicated generally at 64, can be moved through a greater angular displacement than that otherwise possible, as suggested by the angularly related

axes

28 and 30 of FIG. 2. Since the articles A and A must be removed from the positions shown in FIG. 2 by the takeout mechanism (not shown) along a line indicated generally at 66 in FIG. 3, it will be apparent that this cocking motion of the insert 20 and its associated split molds B' and B" permits slightly larger ware A to be formed at this station of the glassware forming machine than would be the case without this cocking motion.

DETAILED DESCRIPTION OF ALTERNATIVE EMBODIMENT (FIGS. 5, 6 AND 7) The blank mold side of an I. S. type glassware forming machine is shown in FIGS. 5, 6 and 7 as the environment for an alternative embodiment of the present invention. The foregoing description relates to a first or preferred embodiment on the blow mold side of such a machine, and it will be apparent that the blank mold side of this type of machine can also be equipped with an interconnecting link of the type described above so as to increase the clearance between the split blank mold halves and the neck ring arm, and/or the parison itself, during revert motion.

The description to follow shows a modified interconnecting link structure for use on the blank mold side of such a machine, but which structure might also be adapted for use on the blow mold side of an I. S. type glassware forming machine. In view of the basic similarity between the structure shown at the blow mold station of FIGS. 1, 2 and 3 and the structure shown at the blank mold station of FIGS. 5, 6 and 7, similar parts will be designated by corresponding reference numerals to which the subscript a has been appended.

FIG. 5 shows a hinge pin 10a which carries oppositely arranged generally symmetrically constructed mold holder arms 12a and 16a. These arms can be moved from the closed position shown in FIG. 1 to the open position of FIG. 2 in the forming of parisons which are later reverted from the blank mold station shown in FIGS. 5 and 6, where they are formed in inverted positions, to a blow mold station such as shown at FIGS. 1 and 2, where the parisons are blown in an upright configuration. Two such parisons are shown in FIG. 6 at Aa and A'a. Split blank molds Ba and Ba are mounted to each of these mold holder arms 12a and 16a in a conventional fashion. Each split blank mold half, Ba as shown in FIG. 7, is supported by a locating surface 18a on a mold insert member 200, which insert member is itself mounted for limited pivotal floating movement to its associated mold holder arm by means of a pivot 22a. Limited pivotal floating movement of the insert 20a with respect to its associated mold holder ann 12a is conventionally provided for to assure that the split blank mold halves Ba and Ba will be properly aligned with mating split mold halves, such as indicated in the foregoing description of the blow mold halves, when the mold holder arms 12a and 16a are moved from and to their closed positions.

As in the previously described blow mold station the mold holder arms 12a and 16a are adapted for movement between the open and closed position shown by driven rock shafts one of which is shown at 26a. These shafts are oscillated in a conventional fashion by an air cylinder (not shown) in timed relationship to other components of the machine, such as the neck ring invert and revert mechanism as described in the above mentioned Ingle patent. As was true of the blow mold.

station of FIGS. 1-4, the machine geometry limits mold holder arm movement to the angular displacement shown in FIGS. 5 and 6, and from FIG. 6 it will be apparent that the split blank mold halves Ba and Ba are adapted to be cocked with respect to their associated mold holder arms during mold opening movement so that their mating surfaces lie on the axis 28a in the closed position as per FIG. 5, but so that these mating surfaces are cocked slightly with respect to the axis 30a upon which they might be expected to lie after having been so opened per FIG. 6. A novel linkage mechanism to be described serves to cock these mold inserts, and consequently the molds mounted thereon, to the position shown in FIG. 6 wherein an increased clearance is provided in the area of the fixed blank mold hinge pin 10a.

Turning next to a description of the linkage means for pivotally moving the mold holder arms 12a and 16a, the rock shaft 26a is provided in spaced parallel relation to the hinge pin 10a, and has associated therewith a crank arm 32a. This crank arm 32a has a bifurcated end portion across which a pivot pin 34a extends so as to pivotally support a link 36a best shown in FIG. 7. The link 36a is provided with an associated pivot pin 38a which pivot pin is rotatably mounted in the mold holder arm 12a. Thus, angular rotation of the rock shaft 26a causes the crank arm 32a to oscillate the link 36a and thereby achieve the mold holder arm opening and closing movement referred to above. This motion of the mold holder arm like that of the arms 12 and I6 described with reference to FIGS. 1 and 2 is conventional, and the mechanism for cocking the insert 20a with respect to the mold holder arm 12a in accordance with the present invention will now be described.

The insert 20a is provided on the mold holder arm 12a as shown in FIG. 7, and the pivot pin 22a permits angular movement of the insert 20a with respect to the arm 12a as described above. An interconnecting link 40a is provided between the insert 20a and the crank arm 32a so as to effect the cocking movement of the insert 20a with respect to its arm 12a during a certain range of movement of the arm 12a only. This selective alteration of the pivotal movement associated with the insert 20a is achieved by reason of the pivotal pin and slot connection between the interconnecting link 40a and the crank arm 32a. It will be noted that the first above described embodiment, of FIGS. 1-4 inclusively, provide a pivotal pin and slot connection between the interconnecting link 40 and the insert 20.

As shown in FIG. 5 the connection between the interconnecting link 40a and the crank 32a can be seen to comprise the upper end of pin 34a and an elongated slot 46a, as shown generally at 420 in H6. 7. Thus, the pin and slot connection between the interconnecting link and the crank arm 32a of the present embodiment corresponds to the pivotal pin and slot connection between the interconnecting link and the insert of the previous embodiment. Both connections serve the same purpose in that the slot is elongated in the direction of the rock shaft 26a and restricts movement of the insert. A closed end slot is used in the present embodiment, as compared to the open ended slot 46 of the previous embodiment, but the purpose of this pin and slot connection is substantially the same in both embodiments. it is an important feature of the present invention that the pin 34a is arranged in spaced relationship to both the longitudinally opposed end portions of the slot 460 in the interconnecting link 40a at least when the molds are closed as shown in FIG. 5.

Opening movement of the mold holder arm 12a, caused by rotation of the crank 32a, causes the pivot pin 34a in the crank arm 32a to bottom out on the outboard end of the slot 46a in the interconnecting link 40a thereby cocking the insert a with respect tothe mold holder arm 12a as the latter reaches the open position shown in FIG. 6.

During closing movement of the mold holder arm 12a the slot 46a will permit the interconnectihg link 40a to move relative to the insert 20a. From FIG. 7 it will be apparent that the end of the interconnecting link 40a opposite the pin and slot connection 42a comprises a pivot pin 500, which pivotally connects the interconnecting link 40a to the insert 20a as indicated generally at 52a. As will be apparent from FIG. 7 this pivot pin 50a passes downwardly through the mold holder arm 12a, and more particularly through bifurcated link portions thereof, and due to the relative movement between this pin 50a and the mold holder arm 120 during the cocking motion described above, a clearance opening is provided as indicated generally at 60a in FIG. 7 to permit this relative motion. Thus, the pin and slot connection 56a, defined generally by the lower end of the pivot pin 50a and the slot 60a in the mold holder arm itself, serves to limit the oscillatory motion of the insert 20a with respect to the mold holder arm 12a in much the same manner as the pin and slot configuration described hereinabove with reference to the previous embodiment. Although no spring biasing means equivalent to the return spring 54 is provided in the embodiment shown in FIGS. 5, 6 and 7, the frictional forces between the various links and pivot pins has been found to provide a satisfactory substitute for this spring due to the inherent frictional hysteresis of this alternative embodiment.

By way of summary then the primary object of the present invention is to provide means for automatically cocking the split molds either on the blow or the blank mold side of a glassware forming machine so that the inner corners of the mating split molds can be moved through a greater angular displacement than would be the case where said molds remain parallel to their associated mold holder arms during opening movement. This cocking motion is advantageous on the blow mold side of the machine to provide room for the take-out mechanism, and more particularly to provide clearance between the newly formed articles and the neck defining portion of the mold as indicated in FIG. 3. This cocking motion is of importance on the blank mold side of the machine to increase the clearance between the neck ring arm mechanisms and the associated inner corners of the split molds, and also in the event that relatively elongated parisons are being formed, because of the fact that when said parisons are being reverted by the neck ring mechanism the lower end thereof swings on a wider are then do their upper ends in passing from the blank mold station to the blow mold station of a typical I. S. machine. Thus, the present invention permits slightly larger ware to be formed in a glassware forming machine than would be the case without this cocking motion of the split, blow or blank molds in the glassware forming machine.

We claim:

1. In a glassware forming machine wherein at least two mold cavities are defined in radially spaced relation to a hinge pin axis, and wherein the split mold members defining these cavities are movable toward and away from one another in response to pivotal movement of mold holder arms about said hinge pin axis the improvement comprising:

a. insert means for supporting said mold members on said mold holder arms for limited pivotal floating movement with respect to said arms,

b. linkage means for pivotally moving said mold holder arms through a predetermined angular displacement,

c. and a link means interconnecting said linkage means to said insert means for pivotally moving said insert means such that the clearance between the radially inner portions of the mating split mold members is increased as said mold holder arms move into their open positions.

2. The combination defined in claim 1 wherein said linkage means comprises driven rock shafts associated with said mold holder arms respectively, said shafts being movable through predetermined angular displacements on axes parallel said hinge pin axis, crank arms carried by said respective shafts, and links pivotally connecting said crank arms to their associated mold holder arms.

3. The combination defined in claim 2 wherein said interconnecting link means comprises two links each of which extend between each of said crank arms and an associated mold insert means, one end of each of said interconnecting links being pivotally connected to one of said crank arms and the other end of said interconnecting link being pivotally connected to said insert means, one of said interconnecting link ends being more particularly so connected by an elongated slot and pin so as to allow for the limited pivotal floating movement of said mold members during closing mold holder arm movement.

4. The combination defined in claim 3 wherein said insert means is pivotally mounted to said mold holder arm, and pin and clearance slot means for limiting the pivotal movement of said insert means with respect to said mold holder arm, said clearance slot having one end for stopping said insert means in a particular orientation with respect to said mold holder arm.

5. A mold holder assembly for supporting split molds in a glassware forming machine and comprising a hinge pin, mold holder arms pivotally mounted on said hinge pin for movement between mold open and mold closed positions said arms supporting said split molds for limited floating pivotal movement thereon, at least one driven rock shaft, a crank arm on said rock shaft, a link pivotally connected at its respective ends to one of said mold holder arms and to said crank arm for moving said arm, and an interconnecting link one end of which is pivotally connected to said crank arm and the other end being adapted to move said split mold on said arm during opening movement of said mold holder arm to move the split molds to position them such that their radially inner portions have increased clearance therebetween.

6. The combination defined in claim further characterized by mold holder inserts associated with said arms, each insert supporting at least two split molds, and said interconnecting links being pivotally connected at said one end to said crank arms, and being connected to said inserts by a pin and slot connection, said slot having an abutment end to stop said insert in its cocked position relative to its associated mold holder arm when open.

7. The combination defined in claim 6 wherein said pin and slot connection between said interconnecting link and said insert comprises an open ended slot in said insert and a pin on said interconnecting link, and spring biasing means acting between said insert and said mold holder arm to urge the insert toward a particulur orientation with respect to said mold holder arm.

8. The combination defined in claim 7 wherein said insert is pivotally mounted to its mold holder arm, and pin and clearance slot means for limiting the pivotal movement of said insert with respect to its arm, said clearance slot having one end for stopping said insert against the bias of said spring.

9. The combination defined in claim 8 wherein said insert defines said open ended slot so that the open end faces generally toward said rock shaft, said spring biasing force being oriented at right angles to the longitudinal axis of said slot, said pin on said interconnecting link having a follower roller entrapped in said open ended slot, and said pin also supporting one end of said spring biasing means opposite said roller.

10. The combination defined in claim 9 further characterized by pin and clearance slot means associated with said mold holder arm and said pivotal movement of said insert with respect thereto, said clearance slot having one end for stopping said insert in a particular orientation with respect to said arm against the biasing force of said spring.

11. A mold holder assembly for supporting split molds in a glassware forming machine and comprising a hinge pin, mold holder arms pivotally mounted on said hinge pin for movement between mold open and mold closed positions, mold holder inserts pivotally carried on said arms to support said molds for limited floating movement with respect to said arms, at least one driven rock shaft, a crank arm on said rock shaft, a link pivotally connected at its respective ends to one of said mold holder arms and to said crank arm for so moving said arm, an interconnecting link one end of which is pivotally connected to said mold holder insert and the other end of which interconnecting link is loosely connected to said crank arm such that said insert is moved relative to its associated mold holder arm, and as said arm is moved, to increase the clearance between the radially inner portions of the split molds.

12. The combination defined in claim 11 wherein said interconnecting link is loosely connected to said crank arm by a pin and slot joint, said pin comprising the upper end of the pivot pin connecting said crank arm to said link for opening and closing said arm, and

said slot being defined in said interconnecting link.

Claims

1. In a glassware forming machine wherein at least two mold cavities are defined in radially spaced relation to a hinge pin axis, and wherein the split mold members defining these cavities are movable toward and away from one another in response to pivotal movement of mold holder arms about said hinge pin axis the improvement comprising: a. insert means for supporting said mold members on said mold holder arms for limited pivotal floating movement with respect to said arms, b. linkage means for pivotally moving said mold holder arms through a predetermined angular displacement, c. and a link means interconnecting said linkage means to said insert means for pivotally moving said insert means such that the clearance between the radially inner portions of the mating split mold members is increased as said mold holder arms move into their open positions.

6. The combination defined in claim 5 further characterized by mold holder inserts associated with said arms, each insert supporting at least two split molds, and said interconnecting links being pivotally connected at said one end to said crank arms, and being connected to said inserts by a pin and slot connection, said slot having an abutment end to stop said insert in its cocked position relative to its associated mold holder arm when open.

7. The combination defined in claim 6 wherein said pin and slot connection between said interconnecting link and said insert comprises an open ended slot in said insert and a pin on said interconnecting link, and spring biasing means acting between said insert and said mold holder arm to urge the insert toward a particular orientation with respect to said mold holder arm.

12. The combination defined in claim 11 wherein said interconnecting link is loosely connected to said crank arm by a pin and slot joint, said pin comprising the upper end of the pivot pin connecting said crank arm to said link for opening and closing said arm, and said slot being defined in said interconnecting link.