Injection Mold Closing And Locking Clamp, Wedge Or Retention Means Patents (Class 425/DIG221)
  • Patent number: 5925302
    Abstract: In the method, after the pattern-bearing film is fed to the female mold, the distal end of the film is fixed under a lower portion of the female mold, and at the same time the film is retreated by a force from the film supply portion. Thus, this tightens up the film so that the slacks or wrinkles cannot be formed on the film. Therefore, the film can be fortunately spread around the parting surface of the female mold. In the apparatus, the film suppressing frame is pressed to the female mold through the sliding rod arranged in the female mold, in such a manner that the female mold embraces the frame. Thus, the pressing of the frame is performed by a simple structure, and the film is accurately positioned to the internal surface of the female mold. Also, the film suppressing frame is constituted to advance from and retreat to the female mold. Thus, this causes a space between the both molds and an outside standby position to be useless. A space around the apparatus can be effectively utilized.
    Type: Grant
    Filed: April 25, 1995
    Date of Patent: July 20, 1999
    Assignee: Dai Nippon Printing Co., Ltd.
    Inventors: Shinpei Oono, Kazushi Miyazawa, Keiji Hanamoto, Takashi Tarutani, Takashi Matano, Kazuhisa Kobayashi, Hiroyuki Atake
  • Patent number: 5513977
    Abstract: In a clamping device used in an electric-powered injection machine, a motor support (33) is resiliently supported relative to a rear platen (31), and a motor (35) is fixed to the motor support (33). A toggle mechanism is disposed between the motor support (33) and a movable platen (2), so that the movable platen (2) can be moved by driving the motor (35). A rod (45) is also provided to extend with one end abutable against the rear platen (31) and with the other end supporting the toggle mechanism. A reaction force against the clamping force is transmitted directly to the rear platen (31). Thus, it is possible to enhance the durability of the toggle mechanism and to provide an increased clamping force.
    Type: Grant
    Filed: August 5, 1994
    Date of Patent: May 7, 1996
    Assignee: Sumitomo Heavy Industries, Ltd.
    Inventor: Masaya Kitajima
  • Patent number: 5370515
    Abstract: A machine for manufacturing polystyrene foam products, whereby a mold comprising a first half and a second half mold defining a molding chamber when closed, is loaded, with the two half molds locked in the closed position, onto the machine and into an operating position wherein the mold is connected automatically to granular polystyrene and utility fluid supply lines. In this operating position, the two half molds are rendered mutually mobile with the first half mold, connected to the utility supply lines, remaining locked to a fixed frame on the machine, and the second half mold remaining locked to a mobile frame on the machine.
    Type: Grant
    Filed: May 20, 1993
    Date of Patent: December 6, 1994
    Assignee: Bazzica Engineering di Carlo Bazzica & C. S.A.S.
    Inventor: Carlo Bazzica
  • Patent number: 5314323
    Abstract: A stripper plate locking device for use with the mold in a molding machine (e.g., injection, compression or transfer) is presented. The mold has openings in each of the plates of the mold for accepting the stripper plate locking device. The device includes a release pin, a body member and a collet member. The pin has a shaft with a head disposed at one end and a first pair of camming surfaces with a shaft portion therebetween disposed at the other end. The body members has a second pair of camming surfaces with a cylindrical portion therebetween disposed at one end thereof and an opening therethrough wherein the shaft of the pin passes. The collet member has a plurality of expandable resilient fingers which define an opening. The collet member includes a third pair of camming surfaces with a first cylindrical section therebetween for expanding the fingers in cooperation with the first camming surface and the shaft portion of the pin.
    Type: Grant
    Filed: September 9, 1992
    Date of Patent: May 24, 1994
    Assignee: Precision Plastic Tool Co., Inc.
    Inventor: Gene Bolles
  • Patent number: 5275550
    Abstract: A hydromechanic mold clamping mechanism for injection molding machines including a movable mold carrying plate provided with hydraulic cylinder rods linked to a fixed mold carrying plate. In accordance with the invention, movable carrying plate (2) receives four sets of hydromechanic mechanisms (6) independently mounted on said movable carrying plate (2) through set of support rods (12 and 13) fixed to said movable plate (2), supporting hydromechanic sets (6) respectively.
    Type: Grant
    Filed: September 15, 1992
    Date of Patent: January 4, 1994
    Assignee: Industrias Romi S.A.
    Inventor: Romeu Romi
  • Patent number: 5160750
    Abstract: A clamp assembly for selectively friction clamping a member with respect to a column includes inner and outer threaded portions positioned concentrically around the column and within a housing attached to the member. The inner and outer threaded portions are threaded together to transfer force therebetween. A sealed chamber between the inner and outer threaded portions is selectively pressurized to cause an inner surface on the inner threaded portion to displace inwardly onto an outer surface of the column and the outer threaded portion displacing outwardly to provide frictional resistance to longitudinal movement of the member with respect to the column. The inner thread portion and the outer thread portion have a thread pitch difference to substantially compensate for strain deformation occurring thereupon.
    Type: Grant
    Filed: August 15, 1991
    Date of Patent: November 3, 1992
    Assignee: MTS Systems Corporation
    Inventor: James D. Holbrook
  • Patent number: 5017120
    Abstract: A tie-rod assembly used in a press having an inside fixed mold end plate, an outside fixed end plate spaced from the inside plate, a movable mold plate between the end plates, and an actuator for displacing the movable mold plate toward the inside mold end plate for pressing tools carried by the mold plates together in a closing direction and for moving the tools apart in an opposite opening direction includes a tie rod extending along an axis in the direction through the movable plate and having a threaded inside end and an outside end and a stationary threaded element carried on the inside end plate and axially aligned with the tie rod displaced by the actuator independently of the movable plate between a use position and a changeover position with the threaded end withdrawn in the opening direction and spaced from the inside end plate, a nut actuated by a rotary drive for screwing the nut in the changeover position from the tie-rod on the threaded element and inside and outside bracing devices engageable b
    Type: Grant
    Filed: October 17, 1989
    Date of Patent: May 21, 1991
    Assignee: Krauss Maffei Aktiengesellschaft
    Inventors: Reinhard Holzinger, Gerhard Weiss
  • Patent number: 4976602
    Abstract: A motor-operated die clamp mechanism produces a great clamping force even with use of small-output motors, and is adapted for use in a motor-operated injection-molding machine. Screw portion (13a, 13b), threaded reversely to each other, are formed on a ball screw (13) which is rotated by a motor (15). Ball nuts (11, 12), which are threadedly engaged with the screw portions (13a, 13b), respectively, and a movable wedge (6) are coupled to one another links (9, 10). As the motor rotates, the links contract or spread, thereby advancing or retreating the movable wedge with a great force. When the movable wedge advances, it is engagedly pressed against a fixed wedge (5) formed on the mold base (4) of a die (3), thereby causing the die to be fixedly mounted on a stationary board (1) or a movable board (2).
    Type: Grant
    Filed: September 21, 1988
    Date of Patent: December 11, 1990
    Assignee: Fanuc Limited
    Inventor: Seiji Yamazaki
  • Patent number: 4961702
    Abstract: A retainer for use in connection with injection molding that is used to retain a slide in its open position when the mold is opening. The retainer has two pivotally connected jaw members and a coiled compression spring that applies spring pressure to the jaw members as these members engage a pin that is connected to a slide when the mold is opening. The construction of the jaw members avoids undesired spreading when the pin engages the jaw members and the jaw members are constructed in a manner that enables the retainer to be easily assembled. The retainer jaw members completely surround the coil spring and protect it from dirt and only a portion of the ends of the coil spring exert a force upon the jaw members when the retainer is in use.
    Type: Grant
    Filed: February 21, 1989
    Date of Patent: October 9, 1990
    Assignee: Fairchild Industries, Inc.
    Inventor: Frederick C. Kern
  • Patent number: 4900243
    Abstract: A molding apparatus for producing a molding from multi-component plastic, especially polyurethane. The upper and lower parts of the mold are fastened, respectively, on mold holders of which at least one is movable relative to the other and can be propped in a closed position in which the upper mold part and lower mold part are still at a slight distance apart. Starting out from this closed position the upper and lower mold parts can be brought together and pressed against each other by a jacking device which is provided on at least one of the mold holders.
    Type: Grant
    Filed: November 21, 1988
    Date of Patent: February 13, 1990
    Assignee: Fritsche, Moellman GmbH & Co. KG
    Inventor: Guenter Moellmann
  • Patent number: 4842506
    Abstract: A clamping device for removably securing shaping moulds on the plates of moulding presses, wherein a catch with projecting head is secured on the mould element, while the plate of the press is equipped with a slide element which slides obliquely under the effect of a lateral jack. The slide element has an opening in the form of a button-hole cut out therein, of which the part of larger diameter is traversed by the projecting head, while the part of smaller diameter allows passage only of the cylindrical shank of the catch.
    Type: Grant
    Filed: March 23, 1988
    Date of Patent: June 27, 1989
    Inventor: Andre Coutier
  • Patent number: 4737093
    Abstract: A die locking mechanism for a molding apparatus including stationary and movable die assemblies, has a stop bar movable back and forth with respect to the stationary frame structure in a direction parallel with the direction of movement of the movable die assembly, and a locking member rockable between first and second angular positions about a fixed pivot axis. The locking member has a cam lobe portion generally arcuately curved about the pivot axis and is engageable with the stop bar, the cam lobe portion being disengaged from the stop bar with the locking member in the first angular position and being engageable with the stop bar with the locking member in the second angular position so that the movable die assembly is locked in position with respect to the movable die assembly.
    Type: Grant
    Filed: June 6, 1986
    Date of Patent: April 12, 1988
    Assignee: Kabushiki Kaisha Sanjoseiki Seisakusho
    Inventors: Nobuo Hori, Mituharu Hirota
  • Patent number: 4696637
    Abstract: A traction type press for shaping a material in a mold type assembly comprising a clamping means associated with a fixed or mobile plate bearing directly on the plate and on the bearing element of the clamping structure situated behind the plate.
    Type: Grant
    Filed: June 19, 1986
    Date of Patent: September 29, 1987
    Inventors: Guy Riviere, Jean P. Luczak
  • Patent number: 4693679
    Abstract: A locking device for locking two mold halves in the closed position for a blow molding process by use of a shaft with at least one lug on one coupling member and a mating key hole in a second coupling member such that the lug passes through the keyhole and is rotated within said second coupling to lock by engaging the lug with a flange of the keyhole. The rotation of the lug being effected by a guide rod and co-operating guide slots such that as the shaft of the coupling member moves in the locking direction the guide rod is guided by the slots to rotate the lug into the locking position.
    Type: Grant
    Filed: November 6, 1985
    Date of Patent: September 15, 1987
    Assignee: Mauser-Werke GmbH
    Inventor: Peter Marth
  • Patent number: 4671764
    Abstract: A device for automatically latching together the two die halves of an injection molding die of a plastics injection molding machine, when the die is removed from the machine, the device comprising a guide sleeve in one die half having a guide portion cooperating with the guide bore of a guide bushing in the other die half, a latching plunger in the guide sleeve having a latching head cooperating with an end face of the guide sleeve to radially expand a split latch ring or a cupped latch disk into engagement with a groove of the guide bushing, when the latching plunger is freed to move from its depressed release position to its latching position, under the action of a preloaded plunger spring. The attachment of the die half to a die carrier member automatically disengages the latching device by depressing the latching plunger.
    Type: Grant
    Filed: October 3, 1985
    Date of Patent: June 9, 1987
    Inventor: Karl Hehl
  • Patent number: 4645446
    Abstract: An ejection device in a die closing unit of an injection molding machine in which the ejector piston rod, reaching from behind through the movable die carrier and into an engagement cavity in the back plate of the movable die half, is automatically engaged with, or disengaged from, the ejector plate, in the course of the movement of a die assembly into and out of the operating position, in conjunction with a mechanized die exchange procedure. A connecting socket at the extremity of the piston rod cooperates with a connecting plug on the back side of the ejector plate. A brief interruption of the transfer movement, obtained by means of a stop-start mechanism responsive to the die assembly transfer movement, allows for the piston rod to be extended into, or retracted from, the engagement cavity.
    Type: Grant
    Filed: August 22, 1985
    Date of Patent: February 24, 1987
    Inventor: Karl Hehl
  • Patent number: 4636167
    Abstract: Injection pressure acting on a molten material inside a nozzle in an injection process also acts on a mould clamping piston disposed in an injection cylinder to face an injection piston. The injection pressure acting on the mould clamping piston is transmitted to an auxiliary platen mounted at the right ends of tie bars, thus producing tensile force in the tie bars. Because of the tensile force, a movable platen mounted at the left ends of the tie bars is pulled toward a stationary platen, which in turn presses a movable mould against a stationary mould. Consequently, clamping force proportional to the injection pressure acts on the moulds, thus firmly clamping the moulds.
    Type: Grant
    Filed: October 7, 1985
    Date of Patent: January 13, 1987
    Assignee: Tsuois Corporation
    Inventor: Toru Shibata
  • Patent number: 4594067
    Abstract: A mold closing system for plastic fabricating machines, having a separate transport means for carrying the mold halves toward and away from one another, and separate locking means mounted on the mold halves and operable at the end of the transport movement to lock the mold halves together after the transport means is shut off.
    Type: Grant
    Filed: April 1, 1985
    Date of Patent: June 10, 1986
    Assignee: Mauser-Werke GmbH
    Inventor: Peter Langos
  • Patent number: 4588364
    Abstract: A clamp mechanism for selectively locking and unlocking a first member in a first position relative to a second member comprises a linkage system connecting the first and second members and drive means for articulating the linkage system for moving the first member relative to the second member. A fluid link is provided for locking the first member in position relative to the second member wherein the fluid link is actuated upon sensing the first member approaching the first position.
    Type: Grant
    Filed: April 1, 1985
    Date of Patent: May 13, 1986
    Assignee: Husky Injection Molding Systems Ltd.
    Inventor: Robert D. Schad
  • Patent number: 4579519
    Abstract: The mold halves of a blow mold device are mounted on a pair of arms encircling the mold halves in a semicircular arc which arms are latched together by latching means which are located at the parting line of the mold halves at both sides thereof. Due to this structure, merely the portion of the arms extending between said latching means is subjected to bending forces by the blowing pressure. For swinging the arms and actuating the latching means a common slide is provided in parallel relationship to the longitudinal axis of the blow mold, which slide includes a number of control cams which are engaged by cam followers cooperating with said arms and said latching means. The invention provides a compact and light-weight construction allowing to actuate a smaller mass in shorter time, thus increasing the production capacity of the blow mold device.
    Type: Grant
    Filed: September 13, 1984
    Date of Patent: April 1, 1986
    Assignee: Krupp Corpoplast Maschinenbau GmbH
    Inventors: Walter Maser, Manfred Mank, Wolfgang Reymann, Klaus Vogel
  • Patent number: 4545753
    Abstract: An ejection device in a die closing unit of an injection molding machine in which the ejector piston rod, reaching from behind through the movable die carrier and into an engagement cavity in the back plate of the movable die half, is automatically engaged with, or disengaged from, the ejector plate, in the course of the movement of a die assembly into and out of the operating position, in conjunction with a mechanized die exchange procedure. A connecting socket at the extremity of the piston rod cooperates with a connecting plug on the back side of the ejector plate. A brief interruption of the transfer movement, obtained by means of a stop-start mechanism responsive to the die assembly transfer movement, allows for the piston rod to be extended into, or retracted from, the engagement cavity.
    Type: Grant
    Filed: November 28, 1983
    Date of Patent: October 8, 1985
    Inventor: Karl Hehl
  • Patent number: 4403810
    Abstract: A tripartite mold has a control bar on a fist outer plate and a locking bar parallel thereto on a second outer plate, both of them traversing respective passages in a guide block on an intermediate plate when the mold is closed. A U-shaped detent, slidable transversely to the two bars in a channel of the guide block, straddles the locking bar with clearance and is urged by spring pressure against the control bar which, in the closed position, it contacts with one leg while its other leg engages in a notch on the locking bar so as to latch the intermediate plate to the second outer plate. When the outer plates are driven apart with initial entrainment of the intermediate plate by the second outer plate, a cam on the control bar represses the detent against its spring force and disengages the other leg thereof from the locking bar whereby further separation of the outer plates lets the intermediate plate stay put while the second outer plate moves away.
    Type: Grant
    Filed: September 4, 1981
    Date of Patent: September 13, 1983
    Assignee: Hasco-Normalien Hasenclever & Co.
    Inventor: Gunther Bieneck
  • Patent number: 4345893
    Abstract: A molding machine for die casting, injection molding, and other similar processes, comprises a base shaped to support thereon a two-part die, and a ram for converging and diverging the die halves between open and closed positions. A pair of clamping frames are pivotally mounted on one end of the base, and include a closed border shaped to surround or receive therein side portions of the die halves. The clamping frames are laterally pivoted between a fanned-apart or open position wherein the die can be freely lifted off of the base, and a folded or closed position wherein the frame borders surround the die side portions and capture the same between the ends of the frames. In the closed position, retractable compression columns extend between the die and one end of the frames to positively lock the die halves in the closed position, whereby die separation forces developed during injection of the die are resisted substantially solely by the clamping frames.
    Type: Grant
    Filed: October 20, 1980
    Date of Patent: August 24, 1982
    Assignee: Prince Corporation
    Inventor: Edgar D. Prince
  • Patent number: 4273524
    Abstract: In a molding press having fixed and movable platens for mounting mold halves, the movable platen is connected through thrust rods and a thrust plate to the movable component of an hydraulic piston-cylinder platen drive unit the fixed component of which is attached to a fixed base. A high pressure piston-cylinder mold clamping unit of the pancake type interengages the movable platen and a pancake cylinder support plate mounted for movement along the thrust rods and arranged for abutment by the thrust plate. The pancake cylinder support plate and fixed base are joined together by toggle joints operated by a piston-cylinder locking unit supported pivotally on arms extending pivotally from the pancake cylinder support plate and fixed base. The drive unit thus is arranged in parallel with the series arrangement of the toggle joints and mold clamping unit.
    Type: Grant
    Filed: October 18, 1978
    Date of Patent: June 16, 1981
    Assignee: Hull Corporation
    Inventor: John A. Smith
  • Patent number: 4222730
    Abstract: An arrangement in connection with the die closing unit of an injection molding machine for interchangeably mounting to the rear side of the stationary die carrier plate differently spaced pairs of tie rods of injection units of different size, using two tie rod mounting sockets whch are clampable to the die carrier plate and thereby also serve to produce an axial preload on the tie rod connections of the die closing unit in the die carrier plate.
    Type: Grant
    Filed: August 30, 1979
    Date of Patent: September 16, 1980
    Inventor: Karl Hehl
  • Patent number: 4222731
    Abstract: A press for molding plastic materials wherein a stationary head and a movable head, arranged for receiving the two parts of a mold, are mounted on a base in which is installed a horizontal longitudinal member having pivoted at its ends vertical rocker levers. The upper ends of the rocker levers are connected to the stationary head and to the movable head respectively, and the lower ends thereof are connected to the ends of a hydraulic piston-cylinder assembly, which, thereby, applies to the heads a clamping force adequate to join the parts of the mold during the molding operation, without loading the base of the machine.
    Type: Grant
    Filed: December 12, 1978
    Date of Patent: September 16, 1980
    Inventors: Leo Enrietti, Piero Enrietti
  • Patent number: 4106885
    Abstract: In a molding press having short-stroke high-power mold-clamping hydraulic rams (9) disposed around the free end of each of its guiding columns (3), the cylinder (21) of each of these rams is fixed to a platen (7) which is movable with respect to the columns (3), while its tubular piston rod (16) through which the corresponding column extends has at its free end a locking device (11) including semi-circular keys 12 which may be selectively engaged into one of a number of successive circular grooves (3b) formed in the column to lock rod (16) therewith. A second locking device (132) of quite similar construction is provided between cylinder (21) and platen (7) to selectively lock the latter with the column, the keys (112) of this second device cooperating with the same series of grooves (3b) as the first one.
    Type: Grant
    Filed: March 17, 1977
    Date of Patent: August 15, 1978
    Inventor: Pierre Poncet
  • Patent number: 4080144
    Abstract: A tie rod structure for a die closing unit of an injection molding machine in which several parallel tie rods hold together a stationary die carrier plate and a stationary head plate, for example, and where the tie rods are seated in attachment bores of the connected plates whose diameter is the same as that of the tie rod guide portion, a threaded tie rod portion on the outside of the plate carrying a threaded abutment collar which is clamped against the plate by a clamping member engaging the extremity of the tie rod. The clamping member may be rotatable out of the way of the tie rod, in order to permit retraction of the latter.
    Type: Grant
    Filed: October 4, 1976
    Date of Patent: March 21, 1978
    Inventor: Karl Hehl
  • Patent number: 4059383
    Abstract: The present invention relates to a mold opening and locking mechanism in an injection molding machine or the like.
    Type: Grant
    Filed: July 14, 1975
    Date of Patent: November 22, 1977
    Inventor: Shigeru Tsutsumi
  • Patent number: 4038015
    Abstract: An injection molding machine has an improved lock and block system wherein the lock recess on the ram is defined between the parallel faces of a pair of spaced apart rings. The lock recess is established at a preselected position by sliding various ones of the rings longitudinally forward or rearward on the compression ram to coincide with a preselected advance position of the compression ram (blocking ram) on which is mounted the movable platen. The rings may be spaced apart by a magnetic spacer which is positioned where it will not be struck by moving parts of the machine. At least one jackhole or toolhole is provided in the side of the ring so that it can be separated from adjacent machine elements during set up operations.
    Type: Grant
    Filed: January 9, 1976
    Date of Patent: July 26, 1977
    Assignee: Cincinnati Milacron, Inc.
    Inventor: James Earl Dawson
  • Patent number: 4025266
    Abstract: An injection molding machine includes a stationary frame having a pair of spaced upright stationary plates which guide rods of a movable frame which includes, at opposite ends of the rods projecting beyond the stationary plates, a pair of movable plates. One of the stationary plates and the movable plate adjacent thereto respectively carry complementary parts of a split injection mold. A unit including a pressure plate fixed to the other stationary plate is arranged on the rods between the other of the stationary plates and the movable plate adjacent thereto. Cylinder and piston arrangement connects the unit and the movable plate adjacent thereto for moving the movable frame relative to the stationary frame and therewith the mold parts between open and closed positions.
    Type: Grant
    Filed: November 5, 1975
    Date of Patent: May 24, 1977
    Assignee: Klockner-Werke AG
    Inventors: Joachim Linde, Wolfgang Spath
  • Patent number: 4017236
    Abstract: A clamping mechanism, effective to press a movable platen against a fixed platen in a terminal phase of a mold-closing stroke of an injection-molding machine, comprises a series of coaxial annular pistons received with progressively larger clearances in respective inner peripheral grooves of a stationary housing linked by tie rods with the fixed platen. The pistons, which can be interconnected by elastic bolts, bear upon a mounting frame, slidable along the tie rods, supporting a pair of laterally withdrawable shutters which in their retracted position give passage to a tubular thrust member coaxially surrounding a plunger secured to that thrust member and to the movable platen. The opposite end of the plunger carries a piston head received, within the housing, in a central driving cylinder to which hydraulic fluid can be admitted from either end for advancing or retracting the movable platen in a mold-closing or a mold-opening stroke.
    Type: Grant
    Filed: November 26, 1975
    Date of Patent: April 12, 1977
    Assignee: Husky Injection Molding Systems Inc.
    Inventors: Dave Penkman, Herbert Rees
  • Patent number: 4005964
    Abstract: An injection mold includes a stationary platen carrying a pair of stationary die sections, a movable platen carrying a pair of movable die sections, and a pair of floating die sections disposed between the movable and stationary die sections. The respective floating and stationary die sections are mutually configured to define a pair of die cavities which are arranged for alternate communication with an injector unit. The floating die sections are selectively connectable to their associated movable and stationary die sections to expose one of the die cavities for article ejection, while maintaining the other die cavity closed for continuing a curing stage.
    Type: Grant
    Filed: February 10, 1975
    Date of Patent: February 1, 1977
    Assignee: Koehring Company
    Inventor: Thomas G. Bishop
  • Patent number: 3986804
    Abstract: Multi-cavity molds, comparatively small in size and stick-like in shape, are passed through mold inspection station, mold locking station, preheating station, a first orientation station, a molding station, a second orientation station, a curing station, an unlocking station, a molded product ejection station, an insert loading station, and to the inspection station again. The molding station provides means for temperature control of a runner and shothead, facilitating use of thermoset materials, with provision for easy cleaning thereof. Insert loading apparatus is employed where the mold product is to include an insert or inserts.
    Type: Grant
    Filed: May 15, 1974
    Date of Patent: October 19, 1976
    Assignee: Automated Machinery Corporation
    Inventor: Pierce E. Albright
  • Patent number: 3947196
    Abstract: A rubber material is sequentially injected into a plurality of elongated molds positioned within a corresponding plurality of vertical hydraulic presses arranged in a row. The material is injected into each mold by a pair of injection molding machines which are arranged in side-by-side relation and are supported by a carriage for both axial and lateral movement as a unit. Each of the molds has a set of mold sections which are supported by upper and lower platens of the corresponding press, and each press includes a set of vertical tie rods which are spaced longitudinally along the mold and are actuated by hydraulic cylinders for rigidly clamping the platens and mold sections together. The tie rods have upper end portions which are releasably locked to the upper mold platen by a laterally movable latch mechanism. After a molding cycle, the latch mechanism is released, and the tie rods are retracted downwardly.
    Type: Grant
    Filed: March 28, 1974
    Date of Patent: March 30, 1976
    Assignee: The French Oil Mill Machinery Company
    Inventors: Murray C. Tribbett, George H. Laug
  • Patent number: RE33248
    Abstract: A clamp mechanism for selectively locking and unlocking a first member in a first position relative to a second member comprises a linkage system connecting the first and second members and drive means for articulating the linkage system for moving the first member relative to the second member. A fluid link is provided for locking the first member in position relative to the second member wherein the fluid link is actuated upon sensing the first member approaching the first position.
    Type: Grant
    Filed: November 14, 1988
    Date of Patent: July 3, 1990
    Inventor: Robert D. Schad