Abstract: At a blow-molding machine for fabricating hollow blow-molded articles from a thermoplastic material a hollow blow mold is moved back and forth with a swinging or pendulum movement upon a transport device containing a mold-supporting platform between a receiving station for the hose-like thermoplastic material to be blow molded and a blow molding station. The platform carries article receiving and transfer means which move in unison therewith and serve to receive the hollow blow-molded bodies or articles formed at the blow-molding station and for delivering the same to an article outfeed or delivery station.

Abstract: A plastic bottle is held from a dome molded above the bottle neck and the dome-held bottle is moved along a horizontal groove by a moveable belt. A heated knife is held against the turning bottle neck and cuts the dome and undesirable flashing from the bottle at the top of the neck.

Abstract: A machine for the blow molding of synthetic resin hollow workpieces with a unit for shutting parted blow molds and with a turntable moved in steps, with a number of rests evenly spaced round the axis of the turntable for blown hollow workpieces. The rests may be moved into a handing over position in the parting plane (E) of the blow mold shutting unit and into at least one after-processing station. There is a blow stick which is supported by a blow stick carriage moved horizontally in this parting plane between the blow position at the blow mold shutting unit and this handing over position. The blow stick carriage is indexed in the blow position in a machine bed. The blow mold shutting unit has horizontal guides for the blow mold supports only at the side furthest from the blow stick carriage.

Abstract: A blow molding machine is disclosed for hollow plastic articles. The machine includes a clamp mechanism for a pair of mold sections. It comprises a body disposed below an extruder at an extruding station and a blow pin at a blow station and carrying opposed platens for supporting the mold sections. Each of a pair of levers is pivotally coupled with a respective platen and with the body and the levers are connected together by a pull bar. An actuating means displaces one of the platens relative to the body and equal and opposite motion is transmitted through the levers and the pull bar to the other platen for opening and closing the clamp. A lifting mechanism supports the clamp for movement between the extruding station and the blow station. The lifting mechanism is adapted for vertical motion by a hydraulic motor acting on a lifting frame. The frame is mounted by pivot links on the machine base and pairs of links are connected by a shaft with a crank arm, the crank arms being connected together by a tie rod.

Abstract: A detabber apparatus is disclosed for use with a blow molding machine for removing a tab forming at an end of a blow molded object. The detabber apparatus features a jaw mounted on a movable support of a carriage for movement between a first operative tab engaged position and a second remote tab stripped position. Power operating means is drivingly connected to the movable support of the carriage for moving the jaw between said first and second positions. The jaw movement is provided along a generally straight line path defined by a cam and cam follower means operatively mounted in the carriage. The carriage incorporates isolated lubrication passageways for the carriage cam and cam follower means in remote isolated relation to the object to be molded.

Abstract: A wraparound closure article comprising a slit tubular body having upstanding rails extending along the slit is formed by a combination of blow-and compression-moulding. The rails are formed by compressing a longitudinal edge portion of a parison between two parts of a closed split-mould to form a flange, and the tubular body is formed integrally with the rails by blowing the remainder of the parison into contact with the closed mould. The flange is then cut to provide the slit of the wraparound closure article and to divide the flange into two discrete rails. The slit extends along the pinch-line that forms as a result of compressing the edge portion of the parison in the closed mould.

Abstract: A blow pin assembly for use in blow molding extruded thermoplastic parisons is disclosed. The assembly provides a blow pin tip which effects forge formation of structure on the inside surface of the neck finish of the container. The blow pin assembly utilizes a rotation collar and a cutter collar to aid in removal of any neck moil associated with the blow molding procedure.

Abstract: A blow molded single-walled closable container having a compression molded hinge portion is produced by closing a blow mold with a restricted central portion about a parison so as to form two hinge portions and severing the thus formed article into two sections with each of the sections forming a closable container having a top portion and a bottom portion connected by a hinge portion.

Abstract: An apparatus for removing a waste portion from a blow molded article is disclosed. The apparatus removes the waste portion while the article is enclosed within the blow mold and features a gripping structure for gripping the waste portion and a power assembly associated with the gripping structure to move the gripping structure from the article, thereby pulling the waste portion from its point of attachment with the article. The gripping structure includes two opposed gripping means which are arcuately movable about their respective pivot points. Each pivot point is laterally displaced from the gripping structure and positioned along a line extending through the shortest distance from the pivot point to that portion of the gripping structure which is closest to the attachment of the waste portion to the article.

Abstract: A device for cutting off a sprue of a parison with a bottom is capable of cutting off the sprue in a heating furnace. Cutter plates for cutting the sprue and an outlet for discharging the cut sprue are disposed at the bottom of the heating furnace. Cutting off the sprue may thus be performed without changing the usual molding cycle of the hot parison molding method. The device may alternatively be applied to the cold parison molding method.

Abstract: The invention sets out a method and apparatus of forming a chime projecting radially outwardly of a blow molded hollow member. The chime is formed immediately after the blow molding of the hollow member by forming a radially outwardly projecting channel-shaped part in the side wall of the hollow member. The surfaces of the channel-shaped part are moved toward each other to form a welded connection at the radially inner end of the channel-shaped part. The movement of the channel-shaped part to form the chime is effected by telescoping slides which move axially at different stroke speeds and at different stroke lengths. The radially inwardly most disposed slide moves farthest and faster so as to produce a rolling movement of the channel-shaped part as the chime is formed. The resulting chime is integrally formed from the material of the hollow member and includes at least an outer wall extending circumferentially around the hollow member and a side wall to which the outer wall is welded at its inner radial end.

Abstract: Hollow shapes are blow molded with a special form of gate connecting the shapes to the parison from which they are blow molded and permitting subsequent degating of the shapes by ultrasonic mechanical vibration applied to the gates.

Abstract: A method for applying prefabricated parts for reinforcing, supporting, forming, reshaping or labeling to articles blow molded from a thermoplastic material. A hot parison is blown in a mold into a preform having a shape slightly smaller than the finished article. The preform is then removed from its mold and the prefabricated part is attached to the preform. The preform is then blow molded to impart the finished shape to the article and to embed the prefabricated part into the article.

Abstract: A method and apparatus for molding plastic containers and the like, and for removing unwanted flash material therefrom. In the molding step, the unwanted dome portion of a container is molded to have a conveyor engaging groove therein, and the unwanted tail flash portion is molded to have a weakened line area at the point of attachment to the bottom of the container. After ejection from the mold, the container is conveyed to a tail removal device that grips and tears the tail along the weakened line area by a downward and rearward force. The container is conveyed to a dome removal device that engages the groove in the dome, moves the dome against a cutting edge, and rotates the container to effectuate a complete removal of the dome. The tail and dome removal operations are performed quickly and cleanly immediately after ejection of the containers from the mold while the plastic is still hot and pliable.

Abstract: Parisons are presented at a pickup station related to a plurality of spaced molding stations and a spaced discharge station, so that a plurality of angularly spaced pickup and mold loading devices and a plurality of angularly spaced article transfer devices are operable on a cyclically oscillatable transfer mechanism for orienting the loading devices alternately in a parison pickup position at the pickup station and a mold loading position at the respective molding stations, and for orienting the article transfer devices alternately in an article stripping position at the molding stations and in a discharge position at the discharge station. In each cycle of operation, all of the devices are operated in coordination, and at least one parison is picked up at the pickup station, the at least one previously picked up parison is loaded into one of the molds, another mold is stripped of a molded article, and a previously stripped article is discharged at the discharge station.

Abstract: A method of molding hollow bodies by continuously downwardly extruding a melt of synthetic resin from a die to form a tubular parison, closing and sealing the free end of the parison, holding the parison, cutting the parison thereby forming a cut-off tube with a closed sealed end and blowing a fluid into the cut-off tube retained in the mold thereby forming a hollow body. Certain apparatus modifications are disclosed such that the step of closing and sealing comprises moving sealing members from outside the parison towards its center, bringing the sealing members into contact with each other while filling the resin of the free end into a space provided between the end of a mandrel extension and the sealing members. The holding step consists of holding a portion of the moving parison which becomes the cut-off tube by its outside surface.

Abstract: In the manufacture of extra thin walled plastic containers the tail flash formed during the molding operation is spaced from the container proper by molding one or more standoff projections into the flash. This maintains the tail flash in an appropriate relationship relative to the container until it can be severed by a shearing mechanism. The projections are formed in the tail flash by providing male and female projection elements in the mold. In the absence of such standoffs, the tail flash will come in contact with the container while still sufficiently hot enough to adhere thereto.

Abstract: Disclosed are an integral plastic bowl, waterway and trap for a toilet and the method of making the product. The bowl is concave and leads into a trap which may be interconnected with a standard closet flange. The waterway is vertically aligned with the trap and slopes downwardly from an inlet to an outlet, which is preferably at a position near the bottom interior of the bowl and which also preferably includes a wall surface in overlying alignment with at least a portion of the downwardly sloping waterway portion. During flushing, water from a reservoir flows down the waterway, against the outlet wall surface causing a vortex in the bowl, and then out of the bowl into the trap. In the method of making the product, a plastic parison is positioned between the sections of a blow mold. Next, the mold sections are closed, pinching portions of the parison shut to partially form the trap and waterway and enclosing another parison portion in a bulbous mold cavity.

Abstract: A method of blow molding a component that is to be assembled from a plurality of pieces to insure that apertures used to secure the pieces together are accurately located and effectively formed. The two pieces to be joined are molded in the same mold cavity and are held in a predetermined longitudinal position relative to each other in the mold cavity and which location corresponds to the assembled location of the pieces. The pieces are simultaneously apertured while the molded plastic is still warm by punches that are affixed to a common actuating member. This insures that the parts will fit well when assembled.

Abstract: An apparatus and method utilizing pressurized air discharged through positionable outlets is adapted to blowing core mark material from freshly molded, uncured concrete blocks of either the rib or flute type designed to be split or conventional unsplit blocks so as to prevent the core mark material associated with such blocks from being trapped and hardening in recesses or on surfaces of the blocks.

Abstract: A blow molding assembly for thermoplastic resins, used, for example, for the manufacture of bottles wherein parisons are heated in an oven and then transported to a mold station where they are biaxially oriented and blown. The invention is particularly concerned with a transport system operating from the oven to the molds, wherein the spacing between the various parisons being transported by means of picker means can be adjusted so that the parisons may be introduced into molds at a spacing different from the spacing of the parisons in their travel through the oven. The transport system includes means for picking off parisons from a conveyor with a predetermined spacing and means for spreading or narrowing the spacing to match the centerline-to-centerline spacing of the molds.

Abstract: There is disclosed a method and apparatus for blow molding a thermoplastic container. The blow molded container is fabricated conventionally from a downwardly descending thermoplastic extruded parison tubing which passes between sets of separated mold halves. One of the sets of mold halves is adapted to accommodate an insert positioned on a retaining wand. In another embodiment the wand is supported by means located externally of said mold halves and in some cases axially with respect to the molds.When the molds close and the parison is conventionally blow molded the wand continues to support the insert while at the same time extends beyond the container so blow molded. The insert may be, for instance, a nozzle for a thermoplastic bottle having a cap molded thereabout having break away features whereby the cap may be removed.

Abstract: A rotary blow molding machine includes a rotor mounted on a horizontal driving shaft, a recovery hopper, an ejector mechanism, and mold stations mounted on the outer periphery of the rotor, which mold stations are radially disposed and circumferentially equally spaced, the mold stations each carrying thereon a split mold unit capable of opening and closing in the direction of the width of the outer peripheral surface of the rotor by a mold opening/closing mechanism, a mold clamping mechanism and a flash blow-pipe, the said split mold unit having a mold-release mechanism. It is so constructed as to produce blow moldings successively continuously at high speed and completely automatically during a single rotation of the mold stations on and along the same circular rotation track.

Abstract: An integral, unitary plastic tank and rim flush for a toilet are disclosed, along with the apparatus and method of manufacture. The tank includes a bottom wall and sidewalls, one of which is integral with an essentially tubular water passageway. The rim includes an oval-shaped, hollow duct which is integral with the passageway and includes a plurality of spaced openings in a bottom wall surface to distribute water around the periphery of a toilet bowl. In the method of making the product, an elongated thermoplastic parison is positioned between a pair of blow mold sections. Next, the sections are closed, enclosing respective parison portions within a tank cavity, a passageway cavity and a rim cavity. Blow fluid under pressure is introduced into the parison portion within the tank cavity, resulting in the various cavity-enclosed parison portions being blown to their final shape. After cooling, the article is removed from the mold, trimmed and drilled to form the final product.

Abstract: An apparatus for cooling the neck moil of a blown container so that such moil can be easily removed from the container is disclosed. The apparatus has a main body portion which is connected to the rod of a blow pin cylinder so that the apparatus can be moved towards and away from the blow mold. The main body portion also has attached thereto the blow pin, a cutting collar and a rotation collar. To feed blow air to the blow pin, the main body portion provides an air channel. An annular cylinder is formed in the body portion which cylinder accepts an annular piston which piston has a cooling plate connected thereto. The cooling plate is designed to contact and flatten the moil against the cold blow mold so that the moil is cooled. By feeding compressed air to the cylinder at its upper end, the cooling plate is moved to contact the moil and by feeding compressed air to the cylinder bottom the cooling plate is retracted from the moil.

Abstract: A tray of thermoplastic material having means releasably latching a power tool in storage position thereon with the tool handle oriented to serve as the carry handle for the tool and attached tray, the tray providing storage for the power cord and accessories. An opening through a wall of the tray is defined by shearing the material during the blow mold cycle.

Abstract: A process and apparatus for blow-molding hollow bodies in a mold having half-molds which are closed along a mold joint during blow molding and are laterally displaced with respect to one another to open the mold for removal of the formed hollow body. The half-molds are shaped to form a concave bottom on the hollow body and when the half-molds are opened they impose a translation movement on the hollow body. A plug is formed at the bottom of the hollow body during molding which plug is seized by pincers prior to the opening of the mold such that the hollow body is supported by the pincers during mold opening. The pincers are displaced during mold opening, in translation parallel to the plane of the mold joint, over a distance at least equal to that imposed on the hollow body by the half-molds during opening of the mold.

Abstract: A method of and apparatus for separating off waste material from a moulded article in the production of hollow articles of thermoplastics material by a blowing process in a multi-part mould involves pinching together regions of a partly-made article during closure of the mould parts around it and once a satisfactory weld seam has been created at the pinch regions then increasing the closure speed of the mould parts. Control of the mould closure speed may be effected by open loop control or by automatic control, and may be made dependent on time and/or on displacement of the mould parts. The increased final closure speed can with advantage be equal to the mould closure speed at which the mould parts are moved up to the beginning of the pinching process.