Abstract:
A system and method of cooling glassware molds by directing liquid coolant to the blank or blow mold halves of a glassware forming machine through an enclosed pivotal rotary union-type structure. A coolant manifold is carried by each pivotal mold arm, and communicates with coolant inlet and outlet ports at the lower end of each mold part. The manifold is connected by a floating shaft seal and a rotary union assembly and a crank arm to a coolant source and coolant return in the section box of the associated machine section. Each pivotal connection—i.e., between the section box and the crank arm, between the crank arm and the rotary union assembly, and between the rotary union assembly and the floating shaft seal—comprises a bi-directional rotary union for feeding liquid coolant to the manifold and mold parts, and returning coolant from the manifold and mold parts. Dynamic floating seals between the coolant manifold and the mold parts, and between the coolant manifold and the rotary union mechanism, accommodate relative motion between these components as the mold parts are opened and closed.

Description:
The present invention is directed to the cooling of molds in a glassware forming machine, and more particularly to liquid cooling of the blank molds and/or blow molds in an individual section machine. 
     BACKGROUND AND OBJECTS OF THE INVENTION 
     The science of glass container manufacture is currently served by the so-called individual section machine. Such machines include a plurality of separate or individual manufacturing sections, each of which has a multiplicity of operating mechanisms for converting one or more charges or gobs of molten glass into hollow glass containers and transferring the containers through successive stations of the machine section. Each machine section includes one or more blank molds in which a glass gob is initially formed in a blowing or pressing operation, an invert arm for transferring the blanks to blow molds in which the containers are blown to final form, tongs for removing the formed containers onto a deadplate, and a sweepout mechanism for transferring molded containers from the deadplate onto a conveyor. U.S. Pat. No. 4,362,544 includes a background discussion of both blow-and-blow and press-and-blow glassware forming processes, and discloses an electropneumatic individual section machine adapted for use in either process. 
     In the past, the blank and blow molds of a glassware forming machine have generally been cooled by directing air onto or through the mold parts. Such techniques increase the temperature and noise level in the surrounding environment, and consume a substantial amount of energy. Furthermore, productivity is limited by the ability of the air to remove heat from the mold parts in a controlled manner, and process stability and container quality are affected by difficulties in controlling air temperature and flow rate. It has been proposed in U.S. Pat. Nos. 3,887,350 and 4,142,884, for example, to direct a fluid, such as water, through passages in the mold parts to improve heat extraction. However, heat extraction by liquid cooling can be too rapid and uncontrolled, at least in some areas of the mold, so steps must be taken to retard heat transfer from the inner or forming surface of a mold part to the outer periphery in which the liquid cooling passages are disposed. Various techniques for so controlling liquid-coolant heat extraction have been proposed in the art, but have not been entirely satisfactory. 
     U.S. application Ser. No. 09/400,123 filed Sep. 20, 1999, assigned to the assignee hereof, discloses a system and method for cooling the forming molds in a glassware forming machine, in which each mold includes a body of heat conductive construction having a central portion with a forming surface for shaping molten glass and a peripheral portion spaced radially outwardly of the central portion. A plurality of coolant passages extend in a spaced array around the peripheral portion of the mold body, and liquid coolant is directed through such passages for extracting heat from the body by conduction from the forming surface. A plurality of openings extend axially into the body radially between at least some of the liquid coolant passages and the forming surface for retarding heat transfer from the forming surface to the liquid coolant passages. The openings have a depth into the mold body, either part way or entirely through the mold body, coordinated with the contour of the forming surface and other manufacturing parameters to control heat transfer from the forming surface to the coolant passages. The openings may be wholly or partially filled with material for further tailoring heat transfer from the forming surface to the coolant passages. The mold body is constructed of austenitic Ni-Resist ductile iron having elevated silicon and molybdenum content. Endplates are carried by the mold body for controlling flow of coolant in multiple passes through the coolant passages. The mold may be either a blank mold or a blow mold. 
     Although the system and method for cooling molds in a glassware forming machine disclosed in the noted application address problems theretofore extant in the art, further improvements are desirable. In particular, it is desirable to eliminate hoses, tubing and fittings for delivering liquid coolant to and from the mold parts. This liquid coolant flows at elevated temperature, and it is highly desirable to reduce potential damage and leaks in the coolant flow path under the harsh environmental operating conditions of a glassware forming system. Molten glass, abrasive glass particles and spent lubricants can cause damage to the hosing, tubing and fittings. The hoses, tubing and fittings can become loosened or fatigued due to the harsh operating conditions and severe vibration forces during normal operation, and impede rapid maintenance, repair and replacement of the mold parts and operating mechanisms. It is therefore a general object of the present invention to provide a system and method for cooling molds in a glassware forming machine in which all coolant flow passages are enclosed and protected from abrasion and fatigue under the harsh operating conditions of a glassware forming system. Another object of the present invention is to provide a liquid coolant distribution and sealing system that accommodates relative motion between and among system components as the mold bodies are opened and closed. 
     SUMMARY OF THE INVENTION 
     Briefly stated, the presently preferred system and method of the invention direct liquid coolant to the blank or blow mold halves of a glassware forming machine through an enclosed pivotal rotary union structure, as distinguished from flexible hoses and the like. A coolant manifold is carried by each pivotal mold arm, and communicates with coolant inlet and outlet ports at the lower end of each mold part. The manifold is connected by a floating shaft seal, a rotary union assembly and a crank arm to a coolant source and coolant return in the section box of the associated IS machine section. Each pivotal connection—i.e., between the section box and the crank arm, between the crank arm and the rotary union assembly, and between the rotary union assembly and the floating shaft seal—comprises a bi-directional rotary union for feeding liquid coolant to the manifold and mold parts, and returning coolant from the manifold and mold parts. Dynamic floating O-ring seals between the coolant manifold and the mold parts, and between the coolant manifold and the floating shaft seal, accommodate relative motion between these components as the mold parts are opened and closed. 
     More generally, a system for cooling molds in a glassware forming machine in accordance with the presently preferred embodiment of the invention includes a pair of mold arms mounted for movement toward and away from each other, and at least one blank mold or blow mold part carried by each arm and adapted to cooperate with each other to form a glassware forming mold. Each of the mold parts includes at least one coolant passage having an inlet and an outlet disposed adjacent to each other at one end of the mold part. A coolant manifold is carried by each mold arm adjacent to the ends of the mold parts at which the coolant inlet and outlet are disposed, with each manifold having inlet and outlet coolant flow passages coupled to the inlet and outlet of the associated mold parts. A coolant source and a coolant return are disposed in fixed position adjacent to the mold arms, and a pivotal coupling rotary union assembly operatively connects the coolant source and return to the manifold. The pivotal coupling rotary union assembly includes parallel coolant flow paths for directing coolant from the source through the pivotal coupling assembly and the manifold inlet passage to the mold inlet, through the mold part, and from the mold outlet through the manifold outlet passage and the pivotal coupling assembly to the coolant return. 
     The pivotal coupling rotary union assembly in the preferred embodiment of the invention includes a crank arm assembly having a first crank shaft rotatably coupled to a housing on the section box of the IS machine, a second crank shaft and a crank tie bar interconnecting the first and second crank shafts. The second crank shaft is rotatably received in a shaft link block, as is a manifold tie shaft having a head secured to the side wall of the manifold. Seals in the section box housing and the shaft link block surround the first and second crank shafts and the manifold tie shaft. Parallel coolant flow passages extend from the section box through the first crank shaft, laterally through the crank tie bar, through the second crank shaft, laterally through the shaft link block and through the manifold tie shaft and head to the coolant manifold on the mold arm. In accordance with another feature of the preferred embodiment of the invention, drain passages are formed in the shaft link block, the second and first crank shafts and the interconnecting crank tie bar, and open at each shaft between seals that engage the associated shaft, for draining by force of gravity any coolant that may leak past the seals. 
     In accordance with another aspect of the present invention, which may be used separately from or more preferably in combination with other aspects of the invention, the mold parts are releasably secured to the associated mold arms by clamps that selectively engage a radial ledge at the lower end of each mold part. Each clamp includes a bridge carried in fixed position on the mold arm, and a lockdown clip carried beneath the bridge for rotation selectively to overlie or clear the ledge on the mold part. Thus, the lockdown clip may be rotated into position to overlie the mold part ledge to hold the mold part ledge on the mold arm, or to clear the mold part ledge so that the mold part may be readily removed by an operator for repair or replacement. A detent locking arrangement between the lockdown clip and the bridge provides for releasable locking of the lockdown clip in either the ledge-overlying or ledge-clearing position of the lockdown clip. A rod preferably extends from the clip through an opening in the bridge parallel to the mold part to a position adjacent to the upper edge of the mold part to facilitate rotation of the lockdown clip into and out of engagement with respect to the mold part. A pin on the mold arm is received in an opening on the underside of the mold part to permit limited rotation of the mold part for self-adjustment with the opposing mold part as the mold arms are brought together. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The invention, together with additional objects, features and advantages thereof, will be best understood from the following description, the appended claims and the accompanying drawings in which: 
     FIG. 1 is a fragmentary perspective view of a blow mold station in an individual section machine equipped with a system for cooling the blow mold parts in accordance with a presently preferred embodiment of the invention; 
     FIG. 2 is a fragmentary perspective view of the blow mold station illustrated in FIG. 1 with one mold part removed to facilitate illustration; 
     FIG. 3 is an exploded view of the coolant delivery arrangement at the blow mold station illustrated in FIGS. 1-2; 
     FIG. 4 is a developed sectional view of the rotary union coolant delivery arrangement in FIGS. 1-3; 
     FIG. 4A is an enlarged sectional view of the portion of FIG. 4 within the circle  4 A; 
     FIG. 5 is a perspective view of the coolant delivery rotary union assembly in FIGS. 1-3 and  4 ; 
     FIGS. 6 and 7 are fragmentary sectional views taken substantially along the respective lines  6 — 6  and  7 — 7  in FIG. 5; 
     FIG. 8 is a bottom perspective view of a blow mold part illustrated in FIGS. 1-2; 
     FIG. 9 is a partially schematic illustration of coolant delivery and drainage in the coolant delivery system of FIGS. 1-3 and  4 - 7 ; 
     FIG. 10 is a perspective view of the coolant delivery manifold illustrated in FIGS. 1-3; 
     FIGS. 11 and 12 are side elevational and top plan views of the manifold illustrated in FIG. 10; 
     FIGS. 13 and 14 are sectional views taken substantially along the lines  13 — 13  and  14 — 14  in FIG. 11; 
     FIG. 15 is an exploded sectional elevational view of the crank arm subassembly in the preferred coolant delivery system of the present invention; 
     FIG. 16 is a fragmentary sectional view of a mold part in the coolant delivery system in accordance with the preferred embodiment of the invention; 
     FIG. 17 is a sectional view of the mold lockdown mechanism in FIGS. 1 and 2; 
     FIG. 18 is a perspective view of the lock clamp subassembly in FIG. 17; 
     FIG. 19 is an exploded perspective view of the clamp subassembly in FIG. 18; 
     FIG. 20 is a top plan view of the mold lockdown mechanism in FIG. 17; and 
     FIGS. 21 and 22 are a top plan view and a partially sectioned side elevational view of a modified mold lockdown mechanism for the system of FIGS.  1  and  2 ; 
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
     The disclosure of above-noted U.S. application Ser. No. 09/400,123 filed Sep. 20, 1999, assigned to the assignee hereof, is incorporated herein by reference for purposes of background. 
     FIGS. 1 and 2 illustrate a portion of the blow mold station  30  of one section of an individual section glassware forming machine equipped with a coolant delivery system  32  in accordance with a presently preferred embodiment of the present invention. A pair of mold arms  34 ,  36  are pivotally mounted on a stationary bearing shaft  38 , and each carry a plurality of mold parts  40 . Each mold part  40  is adapted to cooperate with the opposing mold part carried on the opposing arm to form a mold cavity for molding an article of glassware. The presently preferred embodiment is illustrated in the drawings in connection with a blow mold station  30 , in which each pair of mold parts  40  cooperates with a bottom mold element  42  and with each other to form a blow mold cavity. It will be understood, however, that the coolant delivery system  32  in accordance with the present invention is equally useful for cooling the blank molds at the blank mold station of an IS machine section, either a linear machine or a rotary machine. The coolant delivery system  32  (FIG. 1) associated with mold arm  34  will be described in detail. The coolant delivery system associated with mold arm  36  is a mirror image of system  32 . It will also be appreciated that, although station  30  is illustrated in FIGS. 1 and 2 as a station for a so-called triple gob IS machine, comprising three pairs of mold parts  40 , the present invention is equally useful in conjunction with so-called single, double, quad and other types of glassware forming machines. 
     A coolant manifold  44  is secured beneath mold arm  34  for movement conjointly with the mold arm. A plurality of clamps  46  are carried by manifold  44 , each for securing an associated mold part  40  in position relative to the manifold. Each clamp  46  includes a bridge  170  (FIGS. 1-2 and  17 - 20 ), having side legs secured to manifold  44  and an upper reach spaced from the opposing face of manifold  44  parallel thereto. A lockdown clip  172  is disposed beneath each bridge  170 . Each clip  172  includes a body having a laterally extending finger  174  that is adapted in assembly to overlie a ledge formed by a plate  148  (FIGS. 1-2) that extends laterally outwardly from the lower end of each mold part  40 . A pair of pockets  176 ,  178  are formed on the underside of bridge  170 . A rod  180  has a lug  182  press fitted and pinned or otherwise fixedly secured to the lower end thereof. Rod  180  extends upwardly through mold arm  34  or  36  adjacent to an associated mold part  40 . The upper end of each rod  180  has a hex head for engagement by an appropriate tool. A dowel pin  184  is press fitted or otherwise secured to a radial lobe on lug  182 , and extends upwardly therefrom parallel to rod  180  for selective registry with pockets  176 ,  178  in bridge  170 , as will be described. 
     Lug  182  and the lower end of rod  180  are positioned in a pocket  186  on the body of clip  172 . A spring  188  is captured in compression within pocket  186  beneath lug  182 . A pin  190  extends downwardly from clip  172  coaxially with rod  180 , and is received in a corresponding pocket on manifold  44  to guide rotation of clip  172 . The lobe on lug  182  rotatably couples clip  172  to rod  170 . That is, rod  180  may be rotated clockwise (FIGS. 1,  2  and  17 - 20 ) to rotate lockdown clip  172  clockwise until detent pin  184  is in registry with detent pocket  176  in bridge  170 , at which point the force of spring  188  will urge pin  184  into pocket  176 . At this point, the arm  174  of clip  172  clears plate  148  of the associated mold body  40 , so that the mold body can be lifted from the mold station by an operator for repair or replacement. When the mold body is replaced in position over a locating pin  69  (FIG. 2) on manifold  44 , rod  180  and lockdown clip  172  may be rotated counterclockwise until ball pin  184  registers with detent pocket  178  in bridge  170 , at which point finger  174  overlies mold plate  148  and holds the mold in position. In FIG. 1, the clamp  46  associated with the first mold part is illustrated in the non-engaged position for releasing the mold part, while the clamps  46  associated with the second and third mold parts are illustrated in the engaged position. Rods  180  and pins  190  also function to hold clips  172  in position beneath bridges  170 . 
     FIGS. 21-22 illustrate a modified lockdown clamp  192 . Each clamp  192  includes a bridge  48 , having side legs secured to manifold  44  and an upper reach spaced from the opposing face of manifold  44  parallel thereto. A lockdown clip  50  is disposed beneath each bridge  48 . Each clip  50  includes a body having a laterally extending finger  52  that is adapted in assembly to overlie the plate  148  that extends laterally outwardly from the lower end of each mold part  40 . A pair of pockets  56 ,  58  are formed on the underside of bridge  48 . A detent ball  60  and a coil spring  62  are captured in compression within a pocket  64  on the body of lockdown clip  50  for selective registry with detent pockets  56 ,  58  on the underside of bridge  48 . A clip rod  66  is coupled to the body of each lockdown clip  50 , and extends upwardly therefrom through mold arm  34  or  36  for selectively rotating clip  50  and clip finger  52  into and out of overlying engagement with the ledge  54  of the associated adjacent mold part. That is, rod  66  may be rotated clockwise to rotate lockdown clip  50  clockwise until detent ball  60  is in registry with detent pocket  56  in bridge  48 , at which point the force of spring  62  will urge ball  60  into pocket  56 . At this point, the finger  52  of clip  50  clears plate  148  of the associated mold body  40 , so that the mold body can be lifted from the mold station for repair or replacement by an operator. When the mold body is replaced in position over a locating pin  69  (FIG. 2) on manifold  44 , rod  66  and lockdown clip  50  maybe rotated counterclockwise until ball detent  60  registers with detent pocket  58  in bridge  48 , at which point leg  52  overlies mold plate  148  and holds the mold in position. 
     Coolant delivery system  32  also includes a rotary union assembly  68  (FIGS.  1  and  3 - 5 ) having a section box housing  72  that is insertable into an opening in the section box  70  at each machine section. Section box housing  72  includes a top panel  74  and a block  76  welded or otherwise secured to the underside of panel  74 . Block  76  has a central opening that aligns with an opening  78  in panel  74  (FIG. 3) for receiving the lower crank shaft  80  of a crank arm assembly  82 . Shaft  80  is supported within block  76  by axially spaced bearings  84  (FIG.  4 ), which are enclosed by bearing cover plates  86 . A plurality of axially spaced seals  88  are mounted in corresponding channels formed on the inside diameter of block  76  for sealing engagement with opposing lands on shaft  80 . A pair of ports  90 ,  92  extend laterally through block  76 , and open to the internal bore of block  76  on laterally opposed sides of the central seal  88 . A drainage port  94  extends laterally into block  76  and opens to the central bore of the block between the two lowermost seals  88 . Each seal  88  includes an annular Teflon (trademark) based rotary seal  88   a  in sliding engagement with the associated shaft, and an elastomeric O-ring  88   b . O-rings  88   b  are in radial compression to urge seal  88   a  radially inwardly, and to make radially outward sealing engagement with the base of the associated seal groove. 
     Crank arm assembly  82  (FIGS. 3-5 and  15 ) includes first or lower crank shaft  80  and a second or upper crank shaft  96  extending from opposite ends of crank tie bar  98  in opposite parallel axial directions. Lower and upper crank shafts  80 ,  96  are essentially identical, each having a pair of water flow passages  100 ,  102  extending axially through the mid portion of the rank shaft, and opening laterally outwardly adjacent to the ends of the crank shaft. A third passage  104  of reduced diameter extends axially through the mid portion of each crank shaft, and opens laterally outwardly from the crank shaft, opening and circumferential channel associated with passage  100  in lower crank shaft  80  registers with port  90  of block  76  (FIG.  4 ), and the laterally opening end of passage  102  and associated circumferential channel registers with port  92  of block  76 . The lateral opening of passage  104  registers in assembly with drainage port  94  in block  76 . Within crank tie bar  98 , there are a pair of longitudinal parallel passages  106 ,  107  (FIGS. 4,  9  and  15 ) that respectively register in assembly with the lateral openings of passages  100 ,  102  at the upper end of lower crank shaft  80 , and with the associated passages at the lower end of upper crank shaft  96 . Likewise, there is a passage  108  in crank tie bar  98  that interconnects the associated ends of drain passages  104  in lower and upper crank shafts  80 ,  96 . The ends of crank shafts  80 ,  96  are press fitted, shrunk fit or otherwise rigidly secured to crank tie bar  98  so as to maintain alignment and sealing of the various passage ends, which is to say that crank shafts  80 ,  96  do not rotate within the corresponding openings of tie bar  98 . 
     A shaft link block  110  rotatably receives the upper end of upper crank shaft  96 , and rotatably receives the lower end of a manifold tie shaft  112 . Shaft link block  10  has a pair of parallel passages  114 ,  116  (FIGS. 4 and 9) that interconnect the parallel fluid passages  100 ,  102  of upper crank shaft  96  with the corresponding parallel fluid passages in tie shaft  112 , which are identified by the same reference numerals  100 ,  102  to facilitate understanding. Likewise, drain passage  104  in upper crank shaft  96  is aligned with a lateral drain passage  118  in shaft link block  110 , which in turn is connected to a longitudinal drain passage  120  in the shaft link block. Drain passages  118 ,  120  in shaft link block  110  open between the lowermost and uppermost pairs of seals  88  in the shaft link block for collecting any coolant that may leak past the seals. There is no drain passage in tie shaft  112 . Seals  88  surround upper crank shaft  96  and tie shaft  112  in link block  110 , and each shaft is supported by spaced roller bearings  84  with associated bearing covers  86 . Parallel passages  114 ,  116  in link block  110  open on opposed sides of the middle seal  88 , and parallel passages  100 ,  102  in shafts  96 ,  112  open at corresponding axial positions on opposed sides of the center seal, as previously described. 
     Tie shaft  112  has an enlarged integral head  122  (FIGS. 3-7) formed at the upper end thereof. Head  122  is secured to the sidewall of manifold  44 . Passages  100 ,  102  in tie shaft  112  terminate within head  122  in a pair of lateral openings or ports  124 ,  126  respectively. These openings or ports, which are vertically or axially staggered with respect to the longitudinal dimension of tie shaft  112 , register in assembly with a pair of openings or ports  128 .  130  in the opposing sidewall of manifold  44 . These openings  128 ,  130  are circumferentially enlarged at the outside surface of the manifold, and a pair of O-rings  132  (FIGS. 3 and 7) are disposed in a countersunk pocket around each opening  128 ,  130 . A pair of screws  134  loosely secure tie shaft head  122  to the opposing face of manifold  44 , with O-rings  132  being compressed between the opposing faces of head  122  and manifold  44 . The enlarged circumferential dimension of openings  128 ,  130 , coupled with the O-ring seals and the loose mounting of head  122  to the manifold, accommodate relative movement between the tie shaft head and the manifold as the molds are opened and closed without losing communication between the coolant openings or losing the seal around the coolant openings, thus forming a floating shaft seal with the side face of the manifold. 
     Manifold openings  128 ,  130  communicate within the body of manifold  44  with a pair of longitudinal parallel coolant passages  136 ,  138  that extend through the body of the manifold (FIGS.  9 - 14 ). At each mold mounting position on manifold  44  (three positions in the illustrated embodiment), a pair of side passages  140 ,  142  extend from respective longitudinal coolant passages  136 ,  138 , and terminate in a pair of adjacent upwardly opening coolant ports  144 ,  146  at the upper surface of manifold  44 . Each mold body  40  has a plate  148  mounted at the lower end thereof (FIGS. 8-9 and  16 ). Each plate  148  has a pair of coolant openings  150 ,  152  that register in assembly with openings  144 ,  146  in manifold  44 . As disclosed in the above-referenced copending U.S. application, lower plate  148  cooperates with upper plate  155  for routing coolant through a plurality of passages  154  (FIG. 16) around the periphery of mold body  40 . A flow adjuster needle  156  is mounted on upper plate  155  for adjusting the effective cross section to fluid flow of mold body coolant passage  154 . This helps balance coolant flow among the various mold bodies, and can tailor the heat conduction properties of the mold body and associated coolant passages. A wear plate  158  is disposed between manifold  44  and the several mold bodies  40  mounted thereon. The lower openings  150 ,  152  of plate  148  are enlarged and countersunk to receive associated O-rings  159 . The enlarged dimensions of openings  150 ,  152 , coupled with O-rings  159 , permit limited sliding movement between mold bodies  40  and the underlying wear plate and manifold as the molds are opened and closed, while maintaining sealed fluid communication between these elements. 
     There is thus provided a continuous path for fluid coolant circulation from the source of fluid coolant at section box  70 , through rotary union assembly  68  (section box housing  72 , crank arm assembly  82 , shaft link block  110  and manifold tie shaft  112 ) and manifold  44  to each mold body, and then from each mold body back through manifold  44  and rotary union assembly  68  to the return at section box  70 . More specifically, and referring to FIG. 9, there is a continuous path for coolant fluid flow from port  90  of section box housing  72  through passage  100  of lower crank shaft  80 , passage  107  of crank tie bar  98 , passage  100  of upper crank shaft  96 , passage  114  of shaft link block  110 , passage  100  of tie shaft  112  and passage  136  of manifold  44  to coolant passage  154  of mold body  40 . Two passes of coolant through the mold body are illustrated in FIG. 9, although multiple passes may be performed as disclosed in the above-referenced copending application. There is then a continuous path for return fluid from passage  154  of mold body  40  through passage  138  of manifold  44 , passage  102  of tie shaft  112 , passage  116  of shaft link block  110 , passage  102  of upper crank shaft  96 , passage  106  of crank tie bar  98 , passage  102  of lower crank shaft  80  and passage  92  of section box housing  72 . Likewise, there is a continuous path for drainage fluid flow from passages  120 ,  118  in shaft link block  110  through passage  104  in upper crank shaft  96 , passage  108  in crank tie bar  98  and passage  104  in lower crank shaft  80  to port  94  of section box housing  72 . Port  90  is connected by a removable conduit  160  to a pump  162 , and port  92  is connected by a removable conduit  164  to a sump  166 . Drain port  94  is connected by a removable conduit  167  to sump  66  through a sight glass monitor  168 . Monitor  168  allows monitoring of the amount of fluid leakage at the seals. 
     There have thus been disclosed a system and method for cooling molds in a glassware forming machine that fully satisfy all of the objects and aims previously set forth. Coolant fluid flow is completely enclosed, thus eliminating rupture, cracking and fatigue problems associated with the use of external hoses, tubes and fittings. The fluid flow joints between the crank arm assembly and the manifold, and between the manifold and the molds, include sliding seal arrangements that readily accommodate motion of these elements with respect to each other as the molds are opened and closed. A lockdown clamp arrangement has been disclosed that accommodates rapid assembly and disassembly of mold bodies from the cooling system for maintenance and repair, and which accommodates minor motion of the mold bodies with respect to each other and with respect to the mounting arrangement as the molds are opened and closed. Several modifications have been suggested. Other alternatives and modifications will readily suggest themselves to persons of ordinary skill in the art in view of the foregoing discussion. The invention is intended to embrace all such alternatives and modifications as fall within the spirit and broad scope of the appended claims.