Abstract: An in-mold label dispenser (22) for a blow molding machine is disclosed as including a dispensing head (56) mounted for rectilinear movement along a first axis A between a label magazine (48) and an open mold (28) and having a label carrier (58) mounted on the dispensing head for rectilinear movement between retracted and extended positions along a second axis B transverse to the first axis A. Rectilinear movement of the dispensing head (56) along the first axis A and coordinated extending and retracting rectilinear movement of the label carrier (58) along axis B transfers a label (50) from the magazine (48) to the mold (28) in preparation for the blow molding operation. The label dispenser (22) has particular utility when provided with a pair of the label carriers (58) to simultaneously transfer a pair of labels (50) to the open mold (28) within the confined space limitations involved.

Abstract: An injection molding machine includes a platen having a plurality of regularly spaced mold element-receiving chambers adapted to receive any of a number of various mold elements substantially wholly within the stationary platen. A hot manifold system is included between the stationary platen and a plastics injector unit, which includes a plurality of blocks independently coupled to the fixed platen, each block having channels through which the plastics material can flow, the channels of adjacent blocks being coupled by a coupling unit. The machine is particularly designed for quick inexpensive mold changes, and has particular utility in laboratory testing of mold designs and small low-capacity production in satellite plants.

Abstract: The present invention provides a multiple platen-multiple position press or injection blow molding apparatus for use in the blow molding of containers in which a preform is molded onto a core and is moved relative to the core to space a body portion of the preform from the core when the core is in the blowing station to facilitate the temperature conditioning of the preform to achieve a desired biorientation of the thermoplastic material from which the preform is made when the preform is blow molded to form a container. The temperature conditioning may be achieved by allowing stabilization of the temperature gradient through the material of the preform with or without the assistance of a supply of gas to the preform at a desired temperature.

Abstract: The invention relates to a matrix mold, in which at least one mold cavity is bounded by the head of an ejector at the lower opening of a cup, from which in the substantially truncated conical wall of this cup, widening upward, facing the interior, by at least two grooves in the lower part of the cup and by teeth disposed in the interior of these groove, which are radially slidable in a radial direction by an eccentric arrangement, and in which the diameter of the head is greater than the smallest diameter of the mold cavity.

Abstract: A method and apparatus for injection blow molding hollow plastic articles characterized by increased capacity due to back-to-back operations or stack molding and a rapid and efficient operating cycle. The process and apparatus includes back-to-back injection mold stations, back-to-back blow mold stations located on each side of and adjacent said injection mold stations in side-by-side relationship therewith, back-to-back ejection stations located adjacent each of said blow mold stations in side-by-side relationship, and blow cores cooperating with said injection stations and blow stations, wherein the operation of said cores is facilitated by an overlapping cycle.

Abstract: The invention relates to a device for laying and preforming a section of web in a forming mould which is provided at a container thermoforming station. The shaping member is mounted to move between, on the one hand, a lower position corresponding either to the position of closing (obturation) of the bottom opening in the forming chamber when the moulding unit occupies its thermoforming position, or to the median zone of the forming chamber when said unit occupies the stripping position and, on the other hand, an upper position corresponding to the median zone of said forming chamber when the moulding unit occupies the thermoforming position. An annular slot for passage is defined between the lateral face of the shaping member and certain corresponding parts of the lateral face of the forming chamber in the median zone thereof. The transfer piston is adapted to penetrate in the forming chamber.

Abstract: A transparent thin bottle-shaped container is produced by means of a technology for biaxial orientation blow molding a cylindrical piece with a bottom from polyethylene terephthalate material. The pieces are molded in large number in each injection molding process of an injection molding machine. The pieces thus formed immediately after the injection molding are held simultaneously in large number at the gates integrally projected therefrom by a base plate moved forward at the front of the mold in the injection molding machine. They are then conveyed to a gate cutting unit provided near the injection molding machine. The gates are cut from the pieces sequentially by the gate cutting unit and are conveyed onto a conveyor. The pieces are gradually cooled from the hot molded temperature during the conveyance and are additionally cooled while being conveyed on an oblique conveyor installed with a cooler to room temperature or lower predetermined temperature.

Abstract: Blow molding apparatus for manufacturing containers, the apparatus having a blow station, a parison forming station to one side of the blow molding station, a container trim station at the other side of the blow molding station and a multiple station mold carrying slide for shuttle movement between a first position below the parison forming and blow molding stations and a second position below the blow molding and trim stations. The shuttling movement of the slide takes place between a pair of movable platens that are capable of opening and closing the molds. Improved structure in the apparatus insures that the blow heads will not separate from the molds during blowing, provides for trimming of the containers at the trim stations and for deposit of trimmed containers in upright positions on a conveyor.

Abstract: An apparatus for biaxial-blow-molding a hollow bottle-shaped container of a synthetic resin which has a bottom mold having an upper surface becoming the bottom mold surface of the bottle-shaped container and a cylinder chamber formed therein, a bottom protruding pin having an upper end face forming part of the bottom mold surface of the bottom mold and a piston portion formed at the bottom end thereof and telescopically moved back and forth in the cylinder chamber of the bottom mold, and an elastic member disposed in the cylinder chamber of the bottom mold for urging the bottom protruding pin forwardly when the member is contacted with the piston portion of the bottom protruding pin in such a manner that the tension of the member is weaker than the pressure of compressed air to be blown into the molds. This apparatus is operated by a method of biaxial-blow-molding the hollow bottle-shaped container of a synthetic resin of the invention.

Abstract: A method and apparatus for injection blow molding hollow plastic articles characterized by a rapid and efficient operating cycle. The injection mold includes a mold cavity and the blow mold is located adjacent the mold cavity in side-by-side relationship. The parison is injection molded into the mold cavity onto a core. The parison on the core is separated from the mold cavity by moving the parison on the core axially in a straight path away from the mold cavity, followed by movement in a substantially arcuate path into axial alignment with the blow mold, followed by axial movement in a straight path into said blow mold.

Abstract: An article carrier is provided for blow molding equipment which permits relatively simple exchange of the article gripping chuck portion of the carrier. The carrier includes a carrier body, a spindle rotatably supported by the body, an article gripping chuck removeably attached to the spindle and seals between the chuck and the spindle and between the chuck and a preform retained thereby. The chuck is provided with article gripping levers preferably rotatably supported by ball and socket joints. The levers have preform grasping projections at one end and first and second ball ends at the other end. The first ball end mates with the chuck body socket and the second ball end is engaged by a lever actuating ring slidably mounted on the outside of the chuck body.

Abstract: The invention provides a method of and apparatus for cooling the core rods of an injection blow moulding machine having stripper means and an injection blow moulding machine incorporating the cooling apparatus of the invention. The apparatus of the invention comprises nozzle means, preferably in the form of a hollow nozzle bar the interior of which is connectable to a source of cooling fluid under pressure, separate from the stripper means and comprising a plurality of nozzles which are movable between an out-of-use position and an in-use position in which they are interposed between the core rods and stripper means for directing cooling fluid onto the tips of the core rods and preferably substantially axially of the core rods.

Abstract: A transparent thin bottle-shaped container is produced by means of a technology for biaxial orientation blow molding a cylindrical piece with a bottom from polyethylene terephthalate material. The pieces are molded in numerous large number in each injection molding process of an injection molding machine. The pieces thus formed immediately after the injection molding are held simultaneously in large number at the gates integrally projected therefrom by a base plate moved forward at the front of the mold in the injection molding machine. They are then conveyed to a gate cutting unit provided near the injection molding machine. The gates are cut from the pieces sequentially by the gate cutting unit and are conveyed onto a conveyor. The pieces are gradually cooled from the hot molded temperature during the conveyance and are additionally cooled while being conveyed on an oblique conveyor installed with a cooler to room temperature or lower predetermined temperature.

Abstract: A machine for high rate production of molecularly oriented thermoplastic bottles is disclosed. The machine is of the reheat-and-blow type. A blow molding station simultaneously blow molds article preforms arranged in matrices by modular article carriers for conveying the preforms and articles through the machine. The carriers are designed to retain the preforms throughout all operations of the machine from a preform load station through a thermal conditioning section, a blow molding station, and to a bottle eject station, thereby eliminating the need for other preform transferring apparatus. The article carriers together with the associated conveying apparatus comprise a sufficiently flexible structure that minor misalignments of the carriers with the blow molding mechanism do not adversely affect bottle production. Both loading of preforms and ejection of finished bottles are accomplished by operation upon matrices of preforms and bottles as defined by the carriers and conveyor lanes.

Abstract: An in-mold label dispenser (22) for a blow molding machine is disclosed as including a dispensing head (56) mounted for rectilinear movement along a first axis A between a label magazine (48) and an open mold (28) and having a label carrier (58) mounted on the dispensing head for rectilinear movement between retracted and extended positions along a second axis B transverse to the first axis A. Rectilinear movement of the dispensing head (56) along the first axis A and coordinated extending and retracting rectilinear movement of the label carrier (58) along axis B transfers a label (50) from the magazine (48) to the mold (28) in preparation for the blow molding operation. The label dispenser (22) has particular utility when provided with a pair of the label carriers (58) to simultaneously transfer a pair of labels (50) to the open mold (28) within the confined space limitations involved.

Abstract: This relates to an unloading mechanism for unloading blow molded articles from collects carried by a pallet. At an unloading station there is provided a plurality of vertically disposed, guided plungers or ejectors which are carried by a common support and which are spaced along the path of a pallet in accordance with the spacing of collects caried by the pallet. A single actuator carries the support for the movement of the support and the plungers in unison, whereby all blow molded articles carried by collets of a pallet are simultaneously unloaded or discharged. This abstract forms no part of the specification of this application and is not to be construed as limiting the claims of the application.

Abstract: A parison ejector is used in combination with an injection molding apparatus of the type for molding parisons having an injector portion including a plurality of mold cavities communicating with a source of molten plastic material, an ejector portion for engaging the injector portion which includes a movable platen, a plurality of cores shaped and positioned to matingly engage the mold cavities, and an ejector frame which is carried by the movable platen and supports the cores. The parison ejector includes a hydraulic ram which actuates an ejector carriage which carries a pair of jaws pivotally mounted on the carriage and having mating ends which meet to form bearing surfaces which receive cams mounted in the ejector frame. The ends of the jaws form a portion of the mold and the parison is partly formed within it.

Abstract: A knock-out method and apparatus for use in connection with the molding of articles, such as, for example, oil seals fabricated from elastomeric material bonded to a rigid casing, including a plurality of plunger members to apply successive sequential forces to selected sets of molded oil seals for removal thereof from frictional engagement within the molding machine and permit subsequent retrieval from the molding machine. The plurality of plunger members move upward into contact with oil seals retained in the molding center plate to apply sequential forces to the selected sets of the molded articles to position the seals for ready access on top of the plate.

Abstract: A machine for high rate production of molecularly oriented thermoplastic bottles is disclosed. The machine is of the reheat-and-blow type. A blow molding station simultaneously blow molds article preforms arranged in matrices by modular article carriers for conveying the preforms and articles through the machine. The carriers are designed to retain the preforms throughout all operations of the machine from a preform load station through a thermal conditioning section, a blow molding station, and to a bottle eject station, thereby eliminating the need for other preform transferring apparatus. The article carriers together with the associated conveying apparatus comprise a sufficiently flexible structure that minor misalignments of the carriers with the blow molding mechanism do not adversely affect bottle production. Both loading of preforms and ejection of finished bottles are accomplished by operation upon matrices of preforms and bottles as defined by the carriers and conveyor lanes.

Abstract: A single injection blow molding apparatus for making a selected oriented finished product. The apparatus includes the support structure and an injection molding station where a parison is injection molded into a selected configuration. A core rod assembly cooperates in forming the parison which is formed about a first core rod. The parison is conditioned to an orientation temperature. A transfer system is on the support structure for removing the first core rod from the parison and transferring the parison to a blow molding station. The blow molding station is on the support structure and is provided for blow molding the parison while at orientation temperature into the configuration of the finished product. A second core rod assembly with a second core rod cooperates in blowing the parison into the configuration of the finished product.

Abstract: A device for improving the control of the shape of a parison of a blow molding machine. The device has an inner nozzle positioned below the lowermost level of the parison and directed upwardly toward the open end of the parison. The device may be adapted to pivot so that a deflector plate is moved below the finished part.

Abstract: The disclosure relates to a method and apparatus for moulding hollow plastic articles each having a relatively wide neck portion. The method includes the step of mechanically expanding an end portion of a tubular parison from which the article is to be moulded, and introducing into the expanded end portion of the parison a mandrel which cooperates with the mould to form the neck of the article. Subsequently, the parison is expanded by internal air pressure to form the remainder of the article. Movable mould inserts for relieving pressure around the neck of the article are also disclosed.

Abstract: A knock-out method and apparatus for use in connection with the molding of articles, such as, for example, oil seals fabricated from elastomeric material bonded to a rigid casing, including a plurality of plunger members to apply successive sequential forces to selected sets of molded oil seals for removal thereof from frictional engagement within the molding machine and permit subsequent retrieval from the molding machine. The plurality of plunger members move upward into contact with oil seals retained in the molding center plate to apply sequential forces to the selected sets of the molded articles to position the seals for ready access on top of the plate.

Abstract: A neck ring assembly including ejector pins for engaging a parison finish for holding a parison centrally within a neck ring upon the initial opening of the assembly in a positive stripping action. After a small amount of neck ring opening, the neck rings are free of the parison finish permitting no further side load on the take-out mechanism. The stripping mechanism including ejector pins is then completely drawn away from the parison to allow the parison to be removed. The device is simple in construction, has few moving parts, and requires no auxiliary power for operation.

Abstract: This invention relates to a ring form of a rigid and durable material with a metal insert arranged in its passageway. The ring is employed to strip thin walled gelatin capsules from capsule-forming pins which are slightly tapered along their entire length.

Abstract: Preforms or parisons to be blow-molded into bottles are produced in cavities of a lower mold half of a vertical injection-molding machine with the aid of respective cores depending into these cavities from an upper mold half when the mold is closed. As the two mold halves separate, the parisons adhere to the respective cores from which they are subsequently discharged into respective nests of a transfer box or respective cells of a blow-molding unit interposed between these mold halves. In the first instance, the parisons are cooled by a circulating air stream while the transfer box is laterally withdrawn before the start of a new injection-molding cycle, the rigidified parisons being then released from their nests to drop into pockets of an underlying conveyor transporting them to a blow-molding station. In the second instance, the cores are hollow and descend with their parisons into the blow-molding cells whose split walls are closed around the cores by fluidic or mechanical means.

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, then 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 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 aseptic packing machine comprising an enclosure defining a space swept through by a stream of sterile air and means for producing said stream of air. A station for producing containers, a filling station, a closing station and a transfer device cooperating with said stations are disposed inside the enclosure. The moving mechanical parts of said stations and said transfer device which are capable of being contaminating are located outside the part of said space which is maintained non-contaminating by said stream of sterile air.

Abstract: Coating compositions comprising an acrylic solution polymer having a molecular weight of about 30,000 to 250,000 and a Tg above 65.degree. F., a solvent therefor, and a compatible acrylic polymer having a Tg less than -20.degree. F., which is soluble in the same solvent, coated substrates, and especially coated impact-modified acrylic sheets having improved resistance to impact.

Abstract: A method and apparatus are disclosed for injection molding tubular plastic articles around cylindrical core pins at a molding station, for cooling the articles while supported on the core pins, and for then axially stripping the articles from the core pins at an ejection station. The article stripping step is accomplished by a horizontally reciprocable carriage which is selectively moved into and out of vertical alignment with a set of core pins and molded articles positioned at the ejection station. Sectional gripping members on the carriage are radially closable when in alignment with the molded articles, to grasp the articles for their axial removal from the core pins upon the horizontal displacement of the carriage. The stripped articles may be held in a horizontal cantilever position between the gripping members during an operational dwell time for additional cooling subsequent to their removal from the core pins.

Abstract: Apparatus for sensing contaminant material or hung-up work pieces on mandrels, such as the core rods of injection blow molding machines, consists of a sensing member adapted to be moved through a programmed path corresponding to the bottom contour edge of the mandrel and to give an output responsive signal when any material or work piece remains on the mandrel and interrupts the programmed movement of the sensing member. Generally, one or more horizontally extending mandrels are checked by a sensing member linked through a connecting member with a cam following a cam track corresponding in shape and located below the bottom contour edge of the mandrel to be checked. In the preferred form of the invention, an injection blow molding machine includes an automatic stripper and checker, in which stripping fingers associated with the connecting member precede the sensing member and thus strip a preformed work piece off the mandrel simultaneously with the checker sensing member movement along the mandrel length.

Abstract: In apparatus for producing corrugated thermoplastic tubing and which comprises a pair of complementary upper and lower mold assemblies each having an endless array of articulately interconnected mold blocks which are driven along a forward run and back along a return run, the mold blocks co-operatively interengaging in pairs along said forward run to form an axially extending tubular mold tunnel, there is disposed at the entrance to the tunnel an extrusion head having an inner core member and an outer member which surrounds the core member and is spaced therefrom to define therebetween an annular passage terminating in an annular orifice and through which the tubing of thermoplastic material is extruded for expansion by blow molding within the tubular mold tunnel, the annular orifice having portions of increased width in axial alignment with the locations of interengagement between the mold blocks of the mold assemblies in the forward runs thereof, thereby to provide the tubing with thickened portions at thes

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: The present invention relates to a device used in capsule-making machines which, after the gelatin has cured, strips it off the tapered forming pin. More particularly, the device is a plastic ring having a spring metal split ring insert embedded therein along with an external anti-creep spring to maintain proper dimension of the device.

Abstract: A method and apparatus are disclosed for injection molding tubular plastic articles around cylindrical core pins at a molding station, for cooling the articles while supported on the core pins, and for then axially stripping the articles from the core pins at an ejection station. The article stripping step is accomplished by a horizontally reciprocable carriage which is selectively moved into and out of vertical alignment with a set of core pins and molded articles positioned at the ejection station. Sectional gripping members on the carriage are radially closable when in alignment with the molded articles, to grasp the articles for their axial removal from the core pins upon the horizontal displacement of the carriage. The stripped articles may be held in a horizontal cantilever position between the gripping members during an operational dwell time for additional cooling subsequent to their removal from the core pins.

Abstract: Process for mould release of a hollow plastic body moulded by blowing by means of a nozzle in which after cooling the hollow body and opening the mould, a fluid under pressure is injected into the hollow body through the nozzle in the bottom region of the hollow body. The process may be completed by a mechanical ejector acting from the outside at the neck position of the hollow body after the nozzle has been removed from the mould.

Abstract: An article moulding and conveying method including alternately extruding parisons and alternately blow-moulding articles from the extruded parisons and thereafter delivering the blow-moulded articles alternately and at different times along parallel paths directly after being blow moulded to two stationary constantly spaced points of deposit along a predetermined path of article travel, the two constantly spaced points defining a first predetermined distance between each other, intermittently moving deposited articles as a constantly spaced group at a time between the alternate delivery of any two successively delivered blow-moulded articles, the intermittent movement being in a first direction along the predetermined path of article travel a second distance, and the first predetermined distance being an even numbered multiple of the second distance.

Abstract: A blow mold for the production of bellows of the type made of a highly elastic plastic. The blow mold is constructed from individual level-parallel disks which form the level of the outer apexes of two adjacent folds and by forming a slot from each pair of adjacent disks which ends at the outer apex and wherein the slot serves to vent air.

Abstract: In blow molding hollow articles from precursors at molding temperature by distention with fluid under pressure within the cavity of a blow mold, the pressure variation of such fluid beyond preselected limits as measured upstream of the cavity is used to create a signal to reject articles of abnormal quality from the acceptable article flow.

Abstract: A mold composed of two half-molds arranged to undergo pivotal movement into a mold closing position, for molding an article having a reentrant portion extending to both sides of the plane of closure of the half-molds, is also arranged so that during pivotal movement out of the mold closing position one of the half-molds undergoes translational movement parallel to the plane of closure in order to release the reentrant portion of the article from the mold cavity.

Abstract: This disclosure relates to a mold construction particularly adapted for the blow molding of hollow articles having configurated bottoms. The mold is split longitudinally of the article and includes first and second halves each having a separate end portion. The end portions are interconnected so that when the mold is open, both end portions are retained with one mold half with one end portion moving relative to its respective mold half both longitudinally and transversely for both moving transversely with a molded article and longitudinally away from the molded article so as to first completely release the molded article from one mold half, and the end portion of the other mold half being thereafter movable longitudinally with respect thereto to separate the other end portion from the molded article and thus permit the ejection of the molded article from the mold. The molds are arranged in end-to-end substantially touching relation wherein there is a minimum of waste material between adjacent molded articles.

Abstract: An injection-blow molding machine is provided with non-splitting injection and blow molds mounted in stationary relationship on a first platen with the axes of the molds parallel with each other and with a spindle situated equidistant from the molds. Parison pins which cooperate with the two molds are mounted on a second movable platen connected to the end of the spindle and are inserted and withdrawn from the molds as the spindle and the second platen are reciprocated toward and away from the molds. The second platen is also rotatable about the spindle axis to permit the parison pins to be indexed between the injection and blow molds so that parisons can be formed in the injection mold and transferred to the blow mold where a final article such as a container is formed.

Abstract: The mold device is arranged to produce hollow bodies having at least one undercut formed by a radially offset circumferential wall portion, and includes a hollow mold and a movable mold plate which are interconnected during at least the mold closing and opening phases. The hollow mold is formed by a one-piece main body and a plural-part auxiliary body, with the latter forming the undercut. The parts of the auxiliary body are radially movable normal to the axis of the hollow mold through at least the radial extent of the undercut so that, when the parts of the auxiliary body have been moved outwardly, the produced thermoplastic material body can be removed axially from the main body of the hollow mold. The hollow mold is a blow mold operatively associated with an injection mold which is used to produce a preform of the hollow body which is then blow molded, in the hollow mold, to the desired shape.

Abstract: A continuous motion stretch blow molding apparatus for blow molding hollow articles from tubular parisons. A rotary parison loading turret loads parisons sequentially onto a plurality of stretch pin means operatively carried on a continuous motion transfer means which then conveys each of said stretch pin means into an operative position in a molding station on a continuous motion multi-station rotary molding turret. The parisons are stretched longitudinally, blown to form a final article, cooled in the molding stations, and then said article is ejected.

Abstract: In removing articles from a wheel-type blow molding machine continuously revolving in a vertical plane with multiple mold sections opening radially to the wheel axis out of which the articles are ejected sidewise downwardly onto a takeaway pocket conveyor.A process involving positioning the articles in the pockets such that the moils protrude laterally of the conveyor, capturing such moils within a spiral screw channel while still advancing within the pockets, then pivoting such captured articles downwardly to a vertical attitute beyond the conveyor by means of the screw and forward twisting contour of a guide rail.

Abstract: The present invention relates to a device used in capsule-making machines which, after the gelatin has cured, strips it off the tapered forming pin. More particularly, the device is a plastic ring having a spring metal split ring insert embedded therein along with an external anti-creep spring to maintain proper dimension of the device.