Severing Means Is Perforator Patents (Class 425/290)
  • Patent number: 4395216
    Abstract: Dough sheet perforator comprising plurality of axially spaced and aligned star wheels rotating against individual resilient backup members as sheeted dough is passed therebetween to assure complete dough perforation resulting from extended scraping action of teeth of star wheels along associated backup members.
    Type: Grant
    Filed: December 2, 1981
    Date of Patent: July 26, 1983
    Assignee: Anetsberger Brothers, Inc.
    Inventors: Richard J. Anetsberger, John A. Anetsberger
  • Patent number: 4379686
    Abstract: A molding apparatus for molding a recorded disc includes a pair of mold plates adapted to form a mold cavity therein and a center hole forming pin slidably mounted in one of the mold plates. The center hole forming pin is larger in diameter than the hole to be formed and has a projection on its end which is of a diameter equal to the hole to be formed and a length about one-half the length of the hole to be formed. The other mold plate includes a projection extending therefrom of a diameter equal to the diameter of the hole to be formed and a length one-half the length of the hole. In the molding of the disc the projection on the center hole forming pin engages the projection on the other mold plate to form a hole in which a flash is spaced from the edges of the hole.
    Type: Grant
    Filed: February 24, 1982
    Date of Patent: April 12, 1983
    Assignee: RCA Corporation
    Inventors: Robert W. Chambers, Michael L. McNeely, Leslie A. Torrington
  • Patent number: 4374079
    Abstract: The specification discloses an apparatus and method for concurrently manufacturing at least two semiround tubing structures. An extruder including plasticizing means for a plurality of plastic resins extrudes semiround and linear strips of plastic material in generally two back to back D-shaped sleeves. Between the D-shaped sleeves, a strip of adhesively non-compatible material is extruded so that the D-shaped sleeves may be separated. The rounded portions of the D-shaped sleeves are molded in a continuous blow molding arrangement to form the top wall of the semiround tubing. The tubing is cooled, and the two semiround tubing lengths separated from the adhesively non-compatible strip inbetween. Optionally, the base of the semiround tubing may be perforated. The two lengths of semiround tubing are folded with the base inside the top wall and coiled into large reels.
    Type: Grant
    Filed: March 4, 1981
    Date of Patent: February 15, 1983
    Assignee: Hancor, Inc.
    Inventors: James L. Fouss, Larry A. Rosenbaum, James L. Child, Jr.
  • Patent number: 4340349
    Abstract: A method and apparatus for repairing "hot spots" in a refractory lined wall, applicable especially to blast furnaces. A plurality of relatively closely spaced couplings are affixed in advance to a metal shell which overlies the refractory lining. When a hot spot is observed, a jig is installed successively on couplings overlying the hot spot and holes are drilled in the shell. The couplings accommodate a grouting machine which injects grouting material through the holes.
    Type: Grant
    Filed: January 11, 1980
    Date of Patent: July 20, 1982
    Inventor: Larry R. Cary
  • Patent number: 4334849
    Abstract: An apparatus for molding recorded discs includes a pair of opposed mold plates at least one of which is adapted to move toward and away from the other. The mold plates have opposed surfaces which are adapted to form a mold cavity therebetween. A center plate is mounted in each of the mold plates with each center plate having a surface adjacent the opposed surface of the mold plate. One of the center plates has a passage therethrough with a center hole forming pin slidably mounted in the passage. The one center plate has an annular groove in the surface of the passage adjacent the end surface of the center plate. The groove is adapted to receive some of the molding material to form a seal between the center plate and the center hole forming pin and thereby minimize the extent of the formation of flash on the surface of the molded disc.
    Type: Grant
    Filed: February 3, 1981
    Date of Patent: June 15, 1982
    Assignee: RCA Corporation
    Inventor: Marvin D. Bock
  • Patent number: 4324540
    Abstract: Cigarette filters having grooves therein are prepared by subjecting cigarette filters to a groove-making device which includes heated groove-making elements therein, the grooves being formed by the use of heat and pressure as the cigarette filters come in contact with the groove-making elements.
    Type: Grant
    Filed: July 11, 1980
    Date of Patent: April 13, 1982
    Assignee: Brown & Williamson Tobacco Corporation
    Inventors: John H. Sexstone, Tom Lewis, Ken Milliner
  • Patent number: 4319868
    Abstract: The invention disclosed is an apparatus for making a thermoplastic film embossed with tapered bosses having perforations in the tips of each boss through use of a metallic pattern roll and a heated perforating roll. The apparatus and method allow a film having tapered bosses with decreased cross-sectional areas leading to a perforation to be formed without use of expensive vacuum forming methods.The invention discloses a film 10 being heated by a heating means 14 to a deformable state and being embossed on an embossing surface 16 of embossing roll 13 under pressure from the silicone rubber surface 33 of first pressure roll 15. The flm on the apex, 262 of the cone 26 on embossing surface 16 is removed to perforate the cone by perforating roll 17, which is a resilient hollow metal tube heated from a radiant heater mounted on the inside of the hollow metal tube. The perforated film is then embossed a second time by the action of a second embossing roll 18 and then rewound onto a rewind roll.
    Type: Grant
    Filed: January 12, 1981
    Date of Patent: March 16, 1982
    Assignee: The Procter & Gamble Company
    Inventors: Coenraad E. Riemersma, Theodore P. Merz
  • Patent number: 4313718
    Abstract: Method for the manufacture of flexible disks from engraved moulds by means of a compression press comprising starting with a roll of plastic material and bringing a strip of material between the open plates of a compression press without making a preliminary hole in said strip. A preliminary hole is made during the closing of the plates by means of a first punch matched to a complementary punch, said punches serving as centering means for the two moulds, then by the guidance of the first punch in the complimentary punch for the centering of the moulds with respect to one another. The central hole is cut when the plates are closed by means of the complementary punch which is maintained in the raised position throughout the end of the pressing cycle.
    Type: Grant
    Filed: January 2, 1980
    Date of Patent: February 2, 1982
    Assignee: Thomson-CSF
    Inventors: Raymond Llabres, Robert Antoine, Jean P. Lacotte, Charles Marchi
  • Patent number: 4303609
    Abstract: The present invention relates to a process for extruding a thermoplastic sheath in the form of a tubular film provided with perforations and to a device for carrying out the process, according to which the extruded film passes over a skirt through which are blown jets of hot air provoking the perforation and formation of openings in the film; in the areas where the film is not to be perforated, air jets are also blown through channels of smaller width, therefore with a reduced pressure, so that the jets do not provoke the perforation of the film but form an air-cushion facilitating the flow of the film on the skirt; the channels are supplied from a pneumatic chamber with interposition of a rotary distributor formed by a ring made of graphite or self-lubricating material. The invention is applicable to the manufacture of partially perforated tubular films with a view to making packings.
    Type: Grant
    Filed: December 28, 1979
    Date of Patent: December 1, 1981
    Inventors: Jacques Hureau, Jean-Claude Hureau, Hubert Gaillard
  • Patent number: 4289464
    Abstract: The invention is a process and apparatus for forming a reticulated web net oriented from a perforated film wherein the perforated film is produced by thermoforming projections or pips on an endless perforated surface and subsequently skiving the pips off flush with the film, said thermoforming, skiving and orientation all taking place in a continuous fashion.
    Type: Grant
    Filed: March 6, 1980
    Date of Patent: September 15, 1981
    Assignee: Hercules Incorporated
    Inventor: John N. Hall
  • Patent number: 4273738
    Abstract: Three-dimensional work pieces, such as instrument panels or dashboards, are made of initially flat stock or of synthetic material such as a two-component foamable material. The tools of the present apparatus include upper and lower holding tools which are preferably simultaneously shaping tools, and cutting or trimming tools. The upper tools and the cutting or trimming tools may have a common support which is preferably exchangeably secured in a main frame. The shaping tools are moved into a first cooperating position relative to each other, whereby the work piece is formed into the desired shape. The shaping tools may then be locked in the shaping position or they may be moved into a second cooperating position to be rigidly locked in the second position. A tool support such as a table carried by a scissors lift frame is used for moving the shaping tools into the desired positions. The cutting or trimming is then performed by applying pressure to the respective tools.
    Type: Grant
    Filed: December 4, 1978
    Date of Patent: June 16, 1981
    Assignee: Stanztechnik GmbH R & S
    Inventor: Ernst M. Spengler
  • Patent number: 4256690
    Abstract: A forming die including a cup-shaped cavity for the vacuum thermoforming of sheets of thermoplastic material includes, in the center of its bottom, an upwardly directed pointed projection, the height of which is remarkably smaller than the depth of the said cavity. The suction bores through which vacuum is generated at the interior of the cavity are arranged at the periphery of the bottom of the cavity itself.
    Type: Grant
    Filed: April 3, 1979
    Date of Patent: March 17, 1981
    Assignee: NESPAK S.p.A. Societa Generale per l'Imballaggio
    Inventor: Pierluigi Sabba
  • Patent number: 4252516
    Abstract: A process and apparatus for the manufacture of thermoplastic sheet having elliptical perforations, the process including placing a thermoplastic sheet into contact with a continuously rotating molding element having a series of elliptical holes therein in which the major axis of the elliptical holes is oriented parallel to the direction in which the molding element is rotating, subjecting a surface of the thermoplastic sheet to the action of a fluid pressure differential to cause the material to flow into the elliptical holes of the molding element while maintaining the pressure differential to effect rupturing of the thermoplastic sheet and the formation of elliptical holes in the sheet, and continuously removing the molded portions of the thermoplastic sheet from the molding element.
    Type: Grant
    Filed: August 23, 1979
    Date of Patent: February 24, 1981
    Assignee: Ethyl Corporation
    Inventors: Garland E. Raley, James M. Adams
  • Patent number: 4248822
    Abstract: In the manufacture of a moisture-permeable covering film for absorbent material a thermoplastic film is provided with capillary-like protrusions by embossing, after which openings are produced in the ends of said protrusions. Embossing is effected with simultaneous cooling of the film, so that the ends of the protrusions are oriented in the thermo-elastic temperature range. By a renewed heating of the ends of the protrusions the openings are formed by shrinking, which also causes the edges of the openings to be thickened.The apparatus consists of an engraved metal cylinder and a counter-roller for the embossing step and of a heated roller, which is pressed against the ends of the embossed protrusions on the metal cylinder.
    Type: Grant
    Filed: February 12, 1979
    Date of Patent: February 3, 1981
    Assignee: Lever Brothers Company
    Inventor: Theo Schmidt
  • Patent number: 4247275
    Abstract: PCT No. PCT/US79/01107 PCT Filed Dec. 17, 1979 Sec. 371 Dec. 17, 1979 Sec. 102(e) Date Dec. 17, 1979.A method and apparatus for forming the mounting portion of a sidewall protector includes a rigid mold (19) in which a sidewall protector (12) can be formed and a separate plate assembly (29,31) which is moveable toward the rigid mold to form the mounting holes (10), central opening 11, and a pair of annular ribs (14,16) on opposite sides of the sidewall protector. Movement of the plate (32) is done by a plurality of springs (47) each positioned between the plate (32) and an enlarged head portion (48) of a pin (46). The springs are compressed by a linear actuator (43) and the pin (46) is connected to the mold (19) by a dowel (54) inserted through a hole (53) in the pin (46) to maintain the compression on the springs (47).
    Type: Grant
    Filed: December 17, 1979
    Date of Patent: January 27, 1981
    Assignee: Caterpillar Tractor Co.
    Inventors: Richard W. Kizer, Arlynn W. Anderson, Robert W. Untz
  • Patent number: 4243617
    Abstract: The instant invention is directed to a novel process and apparatus for the production of rebonded foam, and particularly polyurethane foam scrap. The process and apparatus allow for the simultaneous performance of three and preferably four basic operations, i.e. mold filling, curing or steaming, boring and mold stripping, to achieve the shortest, most efficient time cycles to produce a high quality rebonded product. Significant improvements are seen in the quality of the product, reduction in density, reduction in scrap loss, elimination of density variations in the molded product and overall product consistency.
    Type: Grant
    Filed: November 16, 1979
    Date of Patent: January 6, 1981
    Assignee: Mobay Chemical Corporation
    Inventor: Russell W. Burge
  • Patent number: 4233017
    Abstract: An apparatus for uniformly debossing and perforating a ribbon of thermoplastic sheet material or film through the use of vacuum in combination with a flash heating source such as a flow of hot air. The apparatus causes a ribbon film to be forwarded from a supply such as a roll of thermoplastic material, then about a circumferentially extending portion of a rotating debossing-perforating cylinder, and then downstream where the debossed and perforated film may be further processed or where it may be wound on a spool to form a roll thereof. The debossing-perforating cylinder comprises a perforated tubular member through which a plurality of independently adjustable levels of vacuum can be applied from within the cylinder to circumferentially spaced sections of the film in contact with the exterior surface of the perforated tubular member. The apparatus further causes a virtual curtain of hot air to be directed radially inwardly towards a predetermined zone of the perforated tubular member.
    Type: Grant
    Filed: January 25, 1979
    Date of Patent: November 11, 1980
    Assignee: The Procter & Gamble Company
    Inventors: Malcolm B. Lucas, Robert H. Van Coney
  • Patent number: 4226828
    Abstract: The invention is a process for forming a reticulated web net oriented from a perforated film wherein the perforated film is produced by thermoforming projections or pips on an endless perforated surface and subsequently skiving the pips off flush with the film, said thermoforming, skiving and orientation all taking place in a continuous fashion.
    Type: Grant
    Filed: December 20, 1978
    Date of Patent: October 7, 1980
    Assignee: Hercules Incorporated
    Inventor: John N. Hall
  • Patent number: 4218207
    Abstract: Dough-dividing and forming apparatus particularly adapted for forming toroid-shaped articles such as bagels, or the like, is disclosed. A first rotary plate member containing a plurality of cylindrical openings receives a cylindical ribbon of dough into the openings and shears the dough into disc-shaped dough lumps. The dough lumps are subsequently flattened in the center to form a web and pierced to form a generally annular shape. During the piercing operation, the dough lumps are transferred to a second rotary plate member carrying a plurality of tapered, cylindrical forming cups. As the second plate member is indexed between rotary positions, a plurality of cylindrical mandrels are repeatedly thrust into and out of the forming cups to roll the dough lumps internally along the length of the forming cups whereby the desired shape is formed.
    Type: Grant
    Filed: October 6, 1978
    Date of Patent: August 19, 1980
    Assignee: Thompson Bagel Machine Manufacturing Corp.
    Inventor: Daniel T. Thompson
  • Patent number: 4201531
    Abstract: Relatively light gauge thermoplastic sheet material is pierced by a hot punch to provide a bearing aperture. The hot punch is held in sheet-penetrating position long enough to cause plastic flow of displaced material and formation of a collar-like hub surrounding the aperture. The hot punch is withdrawn and replaced by a cool punch to retard further plastic flow of the displaced material, thereby fixing the aperture in desired size and shape. There results a bearing aperture having an axial length greater than the starting thickness of the sheet material, and consequently a larger bearing surface integrally formed locally in the sheet material. Apparatus for forming the bearing aperture is also disclosed.
    Type: Grant
    Filed: May 9, 1979
    Date of Patent: May 6, 1980
    Assignee: The Plastic Forming Company, Inc.
    Inventor: Peter T. Schurman
  • Patent number: 4189292
    Abstract: A relative nutational movement is provided between a member carrying teeth or other radial projections and a member against which these projections bear, these two members being just downstream of an annular extrusion gap that produces a plastic tube which is slit by the teeth or other projections passing through the tube wall in succession and bearing against the backing member. As it comes out from the slitting or punching produced by these members, the tubular material is stretched to and over a mandrel and cooled there to produce a tubular netting or a perforated sheath. Either the toothed member or the backing member may be fixed while the other is moved in a movement of nutation and the toothed member may have externally or internally directed teeth.
    Type: Grant
    Filed: March 14, 1978
    Date of Patent: February 19, 1980
    Inventors: Jacques Hureau, Jean-Claude Hureau, Hubert Gaillard
  • Patent number: 4184831
    Abstract: A synthetic plastic drain pipe comprising a continuous pipe of plastic material having transverse, angular or helical corrugations, said pipe having openings for the entry of water, said openings being disposed in said pipe at regular repeating intervals between corrugated lengths of pipe at least at every 20 cm, preferably 30-50 cm, said pipe being free of any opening between said intervals; an apparatus for producing such a synthetic drain pipe, particularly a pipe having distinct portions of general cross section wherein on said portions there are longitudinally running grooves through which there are disposed openings, said apparatus comprising an extruder having an extrusion head, said extrusion head having a generally annular opening defined by a generally circular die disposed about a generally circular mandrel, said apparatus having in general axial alignment with said opening a pair of endless traveling means in the form of a mold train, each of which traveling means carries cooperating mold halves w
    Type: Grant
    Filed: June 9, 1976
    Date of Patent: January 22, 1980
    Inventors: Wilhelm Hegler, Ralph-Peter Hegler
  • Patent number: 4181484
    Abstract: Apparatus for building underground pipelines by forming a casing in a hole from a forming material which is compacted in the direction from the center of the hole towards its walls. The hole is first filled with the forming material throughout its cross-sectional area and then the material is compacted in the direction towards the walls of the hole. Compaction is effected by a device comprising a rod-shaped body adapted for moving through the hole, the front end of the body being provided with a system of radial ribs.
    Type: Grant
    Filed: February 17, 1978
    Date of Patent: January 1, 1980
    Inventors: Alexandr D. Kostylev, Konstantin S. Gurkov, Vladimir D. Plavskikh, Vladimir V. Klimashko, Leonid G. Rozhkov, Vladimir A. Grigoraschenko, Vasily V. Filippov, Lazar M. Lipovetsky, Valentin N. Ardyshev, Khaim B. Tkach
  • Patent number: 4158534
    Abstract: An apparatus for cutting openings at arbitrarily selectable intervals into a pipe which has a smooth inside or outside surface or a transversely corrugated inside or outside surface comprising a knife disposed inside or outside said pipe, and a movable element whose movement is responsive to a signal to move the knife and pipe wall into mutual contact so that the knife cuts into the pipe wall. Disclosed herein is an apparatus which cuts an opening through the surface of a smooth inner pipe disposed within an outer pipe having transverse corrugations. Also disclosed is an apparatus whose knife is disposed exteriorly and is employed to cut openings into the exteriorly disposed transversely corrugated pipe. The application further discloses an apparatus comprising a pipe forming machine, an apparatus which cuts a hole in a pipe from within the pipe and an apparatus which cuts a hole in a pipe from outside the pipe.
    Type: Grant
    Filed: January 21, 1977
    Date of Patent: June 19, 1979
    Assignee: Wilhelm Hegler
    Inventors: Wilhelm Hegler, Ralph P. Hegler
  • Patent number: 4157237
    Abstract: A rotatable perforated molding element for embossing and/or perforating thermoplastic sheet or film, the molding element including a series of perforated strips having two parallel sides and two parallel ends, the strips being wrapped about a supporting drum in a manner such that the ends of the molding strips lie in a plane generally perpendicular to the axis of rotation of the molding element and the sides of the adjacent strips contact each other, and a method for connecting the rotatable perforated molding element to a supporting drum including wrapping a series of perforated strips having two parallel sides and two parallel ends about the supporting drum in a manner such that the ends of the molding element lie in a plane generally perpendicular to the axis of rotation of the molding element and the sides of the adjacent strips contact each other, and securing the ends of the strips to the drum.
    Type: Grant
    Filed: July 10, 1978
    Date of Patent: June 5, 1979
    Assignee: Ethyl Corporation
    Inventor: Garland E. Raley
  • Patent number: 4155693
    Abstract: A rotatable perforated molding element for embossing and/or perforating thermoplastic sheet or film, the molding element including a series of perforated strips having two parallel sides and two parallel ends, the sides being perpendicular to the ends, each of the strips being welded at the end prior to placing the strips on a supporting drum. Additional strips are placed on the drum until the desired area of the drum is covered with the strips.
    Type: Grant
    Filed: July 24, 1978
    Date of Patent: May 22, 1979
    Assignee: Ethyl Corporation
    Inventor: Garland E. Raley
  • Patent number: 4132519
    Abstract: The creation of controlled hole sizes and locations in uncured reinforced thermo setting plastic material by mechanically perforating the uncured material and "B" staging the material surrounding the perforation by sonic vibration of the mechanical perforating device.
    Type: Grant
    Filed: October 28, 1977
    Date of Patent: January 2, 1979
    Assignee: Rohr Industries, Inc.
    Inventor: Clyde H. Reed
  • Patent number: 4112795
    Abstract: A process for perforating plastic tubes, in particular thin-walled corrugated tubes, by a punching or cutting operation wherein the plastic tubes are subjected to a direct or indirect treatment by a cooling fluid prior to the punching and cutting operation. The process is performed by an apparatus comprising a guide structure and conveying device for conveying the plastic tubes, and further comprising punching or cutting members, while spraying devices are provided for effecting the above-mentioned cooling treatment.
    Type: Grant
    Filed: December 9, 1977
    Date of Patent: September 12, 1978
    Assignee: Wavin B.V.
    Inventor: Warner Jan de Putter
  • Patent number: 4097210
    Abstract: An apparatus forms substantially rectangular cross sections of foamed material by depositing the foaming mixture in a trough lined with flexible material, moving the flexible material along at a predetermined rate, placing a continuous sheet of porous flexible separating material atop the foam and allowing a plurality of articulated members to rest upon the expanding surface. The articulated members are rigid transverse to the surface of the foamable fluid but are freely movable in horizontal and vertical directions. The articulated members have substantially flat bottoms and, as the expanding foam is drawn under them, the weight and shape cause the foam to assume a rectangular cross section. Once expansion is completed, the separating material is perforated to increase the escape of gas and allow a smooth flat top surface to result.
    Type: Grant
    Filed: January 2, 1976
    Date of Patent: June 27, 1978
    Inventor: Federico Hernando Romanillos
  • Patent number: 4080135
    Abstract: A method of and machine for forming articles from a temporarily plastic material in which a hollow mould has material in a plastic state placed in it; plungers to form the interior surface of a through pipe operated to displace plastic material in that mould and a further hollow plunger operated to form a further outlet the passageway of which connects with the through passageway.
    Type: Grant
    Filed: September 9, 1976
    Date of Patent: March 21, 1978
    Inventor: William Alfred Clark
  • Patent number: 4072453
    Abstract: A mobile plant for manufacturing corrugated drain pipe includes an extrusion apparatus, a pipe molding means and a coiling machine for coiling up the extruded pipe. The apparatus may conveniently be mounted in a trailer for transport.
    Type: Grant
    Filed: August 11, 1976
    Date of Patent: February 7, 1978
    Assignee: Ziegelwerke Heinrich Oltmanns
    Inventors: Heinrich Oltmanns, Klaus Volckmann
  • Patent number: 4070429
    Abstract: A method is disclosed for forming a plastic container by a blow molding operation. In the method, a tubular thermoplastic parison is blown to a preform within a first mold by a blow pipe inserted into one axial open end of the parison. Prior to removing the preform from the first mold, a secondary opening is formed in the wall of the preform, either by a spike-shaped piercing surface over which the parison is expanded or by a vent port through which blow air is exhausted to rupture an opening in the preform wall. The preform is then transferred to a second mold, which pinches shut the initial blowing opening of the preform. A second blow pin is inserted into the secondary opening to supply blow air under pressure to expand the preform to a container.
    Type: Grant
    Filed: October 26, 1976
    Date of Patent: January 24, 1978
    Assignee: Owens-Illinois, Inc.
    Inventor: Albert R. Uhlig
  • Patent number: 4060366
    Abstract: A tube perforating device for forming outlet openings in a tube, such as a plastic tube, having discharge openings for passage of air, or the like, where it is desired to diminish the sound of the discharge to a minimum, and the method of accomplishing such opening formations by multiple perforations with perforating members spaced as desired and having ovoid heads to permit perforations of the walls of the tube and withdrawing the head of the perforating means through the perforations, drawing the peripheral margins of the opening outwardly, leaving the inside wall of the tube smooth, thus diminishing turbulance therein, and said device having an adjustment permitting a selective penetration of both walls of the tubing, transversely, with just the point of the penetrating means perforating the bottom wall, forcing said peripheral margin outwardly on the bottom perforation, and withdrawing the said head through the upper wall penetration, again moving the peripheral margin outwardly, providing pairs of openin
    Type: Grant
    Filed: November 1, 1976
    Date of Patent: November 29, 1977
    Inventor: Sven Olof G. Johansson
  • Patent number: 4051754
    Abstract: Apparatus for cutting plastics, said apparatus comprising heated and cooled parts separated from each other by insulating means, whereby said tool is continuously working under a temperature corresponding to the temperature of the transition from a solid into a liquid phase of the plastic to be shaped.
    Type: Grant
    Filed: December 31, 1975
    Date of Patent: October 4, 1977
    Assignee: Siegfried Harcuba
    Inventors: Siegfried Harcuba, Herbert Dits
  • Patent number: 4038008
    Abstract: An apparatus for the production of perforated tubular film i.e., net is disclosed. A tube of a thermosetting polymer is continuously extruded and the extrusion opening is alternately interrupted first from one side of the tube and then from the other thereby doubling the capacity of the machine.
    Type: Grant
    Filed: July 14, 1975
    Date of Patent: July 26, 1977
    Assignee: Conwed Corporation
    Inventor: Ronald Leslie Larsen
  • Patent number: 4036571
    Abstract: Iris leaves for optical components such as diaphragms or shutters are injection-molded, together with integral pivot pins, of thermoplastic resin which is given a mat appearance by a roughening of the mold-cavity surfaces. In the case of a composite leaf consisting of two legs articulated to each other, each leg is a curved foil whose cross-section tapers from its convex to its concave edge to facilitate relative swinging of the legs. The mold cavities are duplicated in confronting surfaces of coacting mold halves and open into deeper sprue channels whose junctions with the cavities are formed by converging slots in shearing bolts that are guided in transverse bores encroaching upon the convex cavity edges, a displacement of these shearing bolts by a distance greater than the foil thickness severing the molded leaves from the runners before the mold is opened.
    Type: Grant
    Filed: November 14, 1975
    Date of Patent: July 19, 1977
    Assignee: Jos. Schneider & Co. Optische Werke Kreuznach
    Inventors: Hermann Geyer, Albert Baab, Paul Himmelsbach
  • Patent number: 4015917
    Abstract: A plastic film packaging bag is fabricated with directionally tear-prone wicket mounting holes having a hole edge reinforcing bead of plastic selectively thinner in the desired tearing direction formed by a hot gas stream directed through shaped templates holding the bag.
    Type: Grant
    Filed: July 3, 1975
    Date of Patent: April 5, 1977
    Assignee: Union Carbide Corporation
    Inventor: Alvin E. Ericson
  • Patent number: 3984195
    Abstract: Apparatus for producing continuous polyurethane blocks is disclosed. The apparatus includes pressure regulating members to prevent a crowning of the upper surface of the foamed material. The pressure regulating members comprise a plurality of surface elements each of which is rigid and fixed with respect to an axis taken along the width of the foam. The plurality of elements is arranged or utilized so that the entire width of the foamed material is superposed. The surface elements may be in the form of shoes or rollers. The width of the foamed material may be adjusted by adjusting the apparatus side walls. In such a case, the plurality of surface elements will be arranged or utilized to superpose the entire width without the necessity of shutting down the process or manually adjusting the width of the elements. The shoes or rollers are pivoted or suspended from a common frame so that they are freely movable along the surface of the foamed material in the forward or reverse direction of foam movement.
    Type: Grant
    Filed: October 11, 1974
    Date of Patent: October 5, 1976
    Assignee: Planiblock, S.A.
    Inventor: Bernardo del Carpio
  • Patent number: 3973896
    Abstract: An apparatus for blow molding including a blow mold having mold halves which are relatively movable and receive a parison therebetween. A mandrel is carried by portions of the mold and is movable between an extended position and a retracted position. The mandrel has a free end with a vacuum surface area portion with the end being engageable with the parison when the mandrel is in its extended position. A blow needle is reciprocably mounted in the mandrel and insertion of same into the parison is facilitated by the parison being held against the end of the mandrel by vacuum.
    Type: Grant
    Filed: June 12, 1975
    Date of Patent: August 10, 1976
    Assignee: Phillips Petroleum Company
    Inventor: Donald L. Peters
  • Patent number: 3957409
    Abstract: The means for creating perforated concrete casing comprises a hollow cylindrical canister having a plurality of spaced apart rows of elongated openings formed therein. The elongated openings in each row are horizontally disposed and are vertically spaced. A first support means is secured to the outside surface of the canister adjacent each row of openings. A plurality of vertically spaced plates are mounted on each of the first support means and are selectively movable into and out of the openings of the associated row. A second support means extends upwardly through the canister and has a plurality of vertically spaced wedges mounted thereon. The second support means is movable towards the canister so that the wedges will penetrate the stiff concrete positioned adjacent the inside surface of the canister so as to create tapered perforations therein.
    Type: Grant
    Filed: December 24, 1974
    Date of Patent: May 18, 1976
    Inventor: Gottlieb W. Grosch
  • Patent number: 3947174
    Abstract: Apparatus is provided for preparing perforated seamless tubular films of preferably thermoplastic material by passing an extruded tubular film over a perforated wall of a chamber connected to a constant pressure compressed air source.In the apparatus compressed air from the chamber is allowed to pass periodically out of a first series of openings in the perforated wall, the openings being periodically closed either by axially displacing a plate to block said openings, or by rotating a subadjacent chamber itself provided with a second series of openings, whereby said first and second series of openings are periodically aligned.
    Type: Grant
    Filed: October 2, 1973
    Date of Patent: March 30, 1976
    Inventors: Jean-Claude Hureau, Jacques Hureau