US3667890A - Press - Google Patents

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Publication number
US3667890A
US3667890A US34687A US3667890DA US3667890A US 3667890 A US3667890 A US 3667890A US 34687 A US34687 A US 34687A US 3667890D A US3667890D A US 3667890DA US 3667890 A US3667890 A US 3667890A
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US
United States
Prior art keywords
plate
press
mobile plate
toggles
stationary
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US34687A
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English (en)
Inventor
Sergio Rusmini
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Individual
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Individual
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Publication date
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Publication of US3667890A publication Critical patent/US3667890A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
    • B30B1/10—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by toggle mechanism
    • B30B1/16—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by toggle mechanism operated by fluid-pressure means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/64—Mould opening, closing or clamping devices
    • B29C45/68—Mould opening, closing or clamping devices hydro-mechanical
    • B29C45/681—Mould opening, closing or clamping devices hydro-mechanical using a toggle mechanism as mould clamping device

Definitions

  • This invention relates to a press including a closing device; particularly a press for plastic injection or for lightmetal or light alloy die-casting.
  • Presses of this type generally include a stationary plate through which plastics or molten metal may be injected into a first die-member supported on the plate; a stationary reaction plate parallel to and spaced from the stationary plate; and a mobile plate mounted between the above mentioned plates, the mobile plate supporting a second die-member and being movable towards and away from the stationary plate to enable engagement of the die members.
  • the stationary plate and the reaction plate are held apart by parallel pillars which also act as guides for the mobile plate.
  • Closing devices for moving the mobile plate along the guides and also for applying the rigid closing force to the die are necessary for the operation of these processes.
  • Closing devices proposed for these purposes generally include a pair of toggle members which are fixed to and movable with the mobile plate and which are operable by means of a hydraulic ram.
  • Each of the toggle members has a shorter and a longer arm. When the toggle is extended the longer arm rests with one end against the reaction plate and when the toggle is retracted and the mobile plate is spaced from the stationary one the toggle is passed through a hole in the reaction plate.
  • toggle arms which are sloped with respect to the longitudinal axis of the press and which have hinged feet designed to co-operate with oblique surfaces on the reaction plate.
  • hinged feet represents manufacturing difiiculties both in balancing the eccentric forces imparted to the feet and in preventing rotation of the feet about the hinges.
  • Attempts at overcoming these difiiculties by guiding the longer arms in a direction parallel to the direction of movement of the mobile plate by means of guide holes in the reaction plate have been proposed.
  • the guide holes were equipped with retractable wedges which, at the end of the die closing stroke, moved into the mouth of the guide holes to form supports for the longer toggle arms. In this device difficulties and expense arose in equipping the press with equipment for automatically operating the wedges.
  • the present invention aims to reduce manufacturing According to the invention there is provided a press having a stationary plate, a stationary reaction plate, a moble plate movable between the stationary plates, and a plurality of toggles movable with the mobile plate and disposed to transmit force to the mobile plate, each toggle having a retracted position and a force applying position and including a shorter arm pivotably connected to support means on the mobile plate and a longer arm which has a free end hinged to a guide member for guidance of the free end through an arc to and from a seat on the reaction plate, the guide member being pivotally connected to a support element on the mobile plate.
  • each longer arm is equipped with a guide member, or crank, hinged both at the free end and at a pivot on the stationary cylinder of a hydraulic ram.
  • the ram which operates the toggles, is preferably mounted on the mobile plate with the ram axis perpendicular thereto.
  • the seats are preferably in the form of concave depressions in which the free end of each longer arm can rest.
  • a ram which controls the extension of the toggles is held perpendicular to the mobile plate by supporting elements and the guide members which engage the longer arms of the toggles are hinged on the cylinder of the ram.
  • FIG. 1 is a view of a press in a completely open position
  • FIG. 2 shows the same press in a closed position before the toggles are extended
  • FIG. 3 shows the same press in a closed position with the toggles extended
  • FIG. 4 shows a seat and part of a rod.
  • FIGS. 1, 2 and 3 show a press having a reaction plate 1, a stationary plate 2 supporting a die-member 2 and a mobile plate 3 supporting a die-member 3' which faces the die-member 2'.
  • the plates 1 and 2 are connected by means of parallel pillars 4 and 5 which pass through holes in the mobile plate 3.
  • the mobile plate 3 can be moved between the position shown in FIG. 1 and the position shown in FIG. 2 by means of hydraulic ram 6 and 7.
  • the arms 6 and 7 are only provided for moving the mobile plate '3 between the closed and the open positions of the die-members.
  • Closing pressure for the die-members is supplied by two parallel toggles 8 and 9. This pressure opposes the internal working pressure set up in the die.
  • the toggles 8 and 9 are symmetrically mounted and are identical in design, and therefore only one of the toggles will be referred to in detail.
  • Each toggle has a shorter arm 10 and a longer arm 11 which are hinged at 12.
  • the arm 10 is also hinged at 13 to a support bracket 14 connected to the mobile plate 3.
  • the free end of the arm 11 is pivoted at a hinge 15 on the end of a guide member or crank 16.
  • the other end of the crank 16 is pivoted at a stationary hinge 17 on the cylinder of a hydraulic ram 18.
  • the ram 18 is rigidly connected to the mobile plate 3 by two rods 19 and 20 and supports a slide 21.
  • the ram 18 has a rod 22 which is equipped with a cross-shaped head 23 having opposed bosses 24 and 25.
  • Two small links 26 and 27 are hinged at one end of the bosses 24 and 25 and at the other end to extensions 28 of the arms 10.
  • the toggles 8 and 9 are retracted and the arms 11 and the crank 16 are moved towards the ram 18 thus reducing the area occupied by the closing device.
  • the closing device can thus pass through a central hole 29 of the reaction plate 1 when the mobile plate 3 is moved into the position shown in FIG. 1.
  • the arms and 11 form two sides of a quadrilateral, the third side being formed by the cranks 16 and a straight line connecting the axes of the hinges 17, and the fourth side being formed by a straight line connecting the axes of the hinges 13.
  • crank 16 enables safe operation of the toggles since the ends of the rods 11 are guided directly into the seats 30. The movement is thus substantially free from oscillations or hard impacts.
  • the guide members 16 will be weaker than the rods 11 since the guide members act mainly as guides for hinges while the rods 11 have greater cross-sectional dimensions and are designed to withstand the stresses to which they are subjected.
  • FIG. 4 shows a preferred embodiment of a hinge 17 and a supporting element 30.
  • the end of the arm 11 has a set of parallel bosses 31 extending outwardly from the arm and having coaxial holes through which a gudgeon pin 32 passes to form a hinge 15.
  • the gudgeon pin 32 is encircled by rotatable steel sleeves 33, which act as rollers.
  • a press comprising a stationary plate; a stationary reaction plate formed with an opening therethrough; a mobile plate between said stationary plates and movable between open and closed positions; a plurality of seat means on said stationary reaction plate; a support member fixed to said mobile plate and projecting in the open position of the latter through said opening in said reaction plate; a plurality of toggle means carried by said mobile plate about said suuport member and each com prising a shorter arm pivotally connected at one end to said mobile plate for tilting movement about a pivot axis, a longer arm pivotally connected at one end to the other end of shaid shorter arm, and a guide member pivotally connected at one end to the other end of said longer arm and pivotally connected at said other end thereof to said support member; first moving means connected to said toggle means for moving the same between an inactive position and an active force applying position in which the arms of each toggle means extend substantially colinear with each other and in which said other end of the longer arm of each toggle means engages the respective seat means on said reaction plate, said guide member of each toggle means
  • said first moving means comprise a hydraulic ram including :1 cylinder spaced from and fixedly connected to said mobile plate, a piston reciprocable in said cylinder, a piston rod connected at one end to said piston and having a free end, and means connecting said free end of said piston rod to said shorter arm of each of said toggle means for tilting the respective shorter arm about its pivot axis during reciprocation of said piston.
  • connecting means comprise an extension on each of said short arms, a cross head fixed to said free end of said piston rod, and link means pivotally connected at the opposite ends to said extension and said cross head.
  • each of said seat means is formed with a seat each forming part of a substantially cylindrical surface and including a gudgeon pin pivotally connecting said other end of said longer arm to said one end of said guide member, said longer arm having at said other end a plurality of portions spaced in axial direction of said pin from each other and formed with aligned bores through which said pin extends, and a plurality of sleeves turnably arranged about the pin portion located between said bored portions at said other end of said longer am, said sleeves engaging respectively said seats, when said toggle means are in said active position.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Press Drives And Press Lines (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Presses And Accessory Devices Thereof (AREA)
US34687A 1969-07-16 1970-05-05 Press Expired - Lifetime US3667890A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT1969669 1969-07-16

Publications (1)

Publication Number Publication Date
US3667890A true US3667890A (en) 1972-06-06

Family

ID=11160450

Family Applications (1)

Application Number Title Priority Date Filing Date
US34687A Expired - Lifetime US3667890A (en) 1969-07-16 1970-05-05 Press

Country Status (5)

Country Link
US (1) US3667890A (enrdf_load_stackoverflow)
CH (1) CH498701A (enrdf_load_stackoverflow)
ES (1) ES378119A1 (enrdf_load_stackoverflow)
FR (1) FR2056141A5 (enrdf_load_stackoverflow)
GB (1) GB1296140A (enrdf_load_stackoverflow)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3799728A (en) * 1972-05-18 1974-03-26 Int Fabric Molders Inc Mold closing device for fabric molding
US3823765A (en) * 1972-09-05 1974-07-16 Watry Ind Inc Die casting machine
US3927711A (en) * 1974-01-31 1975-12-23 Fisher Gauge Ltd High pressure die casting apparatus
US4064928A (en) * 1976-11-30 1977-12-27 Ex-Cell-O Corporation Die casting machine
US4088432A (en) * 1977-03-01 1978-05-09 Package Machinery Company Mold lockup mechanism
US4276013A (en) * 1978-12-11 1981-06-30 I.M.I. Industria Macchine Idrauliche S.P.A. Toggle action closing and locking devices for presses
FR2483316A1 (fr) * 1980-05-30 1981-12-04 Spuehl Ag Porte-outils, pour des outils destines notamment a la production de mousses de matieres plastiques
US4383814A (en) * 1981-05-22 1983-05-17 F.Lli Pagnoni S.P.A. Apparatus for the simultaneous closing of the two openings of a press for manufacturing wood chipboard or fibreboard or their substitutes
EP0616882A1 (de) * 1993-03-23 1994-09-28 Leinhaas Umformtechnik GmbH Verfahren zur hydraulischen Ansteuerung einer Gelenk- oder Kniehebelpresse und Gelenk- oder Kniehebelpresse mit einer Steuerung adaptiert für das Ausführen des Verfahrens
TWI382913B (zh) * 2010-09-01 2013-01-21 Long Iong Wu 十連桿型雙肘節鎖模機構

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4393684A (en) 1981-02-12 1983-07-19 Penn Engineering & Manufacturing Corp. Press having a linkage mechanism connectable and disconnectable from a ram

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3799728A (en) * 1972-05-18 1974-03-26 Int Fabric Molders Inc Mold closing device for fabric molding
US3823765A (en) * 1972-09-05 1974-07-16 Watry Ind Inc Die casting machine
US3927711A (en) * 1974-01-31 1975-12-23 Fisher Gauge Ltd High pressure die casting apparatus
US4064928A (en) * 1976-11-30 1977-12-27 Ex-Cell-O Corporation Die casting machine
US4088432A (en) * 1977-03-01 1978-05-09 Package Machinery Company Mold lockup mechanism
US4276013A (en) * 1978-12-11 1981-06-30 I.M.I. Industria Macchine Idrauliche S.P.A. Toggle action closing and locking devices for presses
FR2483316A1 (fr) * 1980-05-30 1981-12-04 Spuehl Ag Porte-outils, pour des outils destines notamment a la production de mousses de matieres plastiques
US4354819A (en) * 1980-05-30 1982-10-19 Spuhl Ag Multi-pivotable mold carrier clamping apparatus
US4383814A (en) * 1981-05-22 1983-05-17 F.Lli Pagnoni S.P.A. Apparatus for the simultaneous closing of the two openings of a press for manufacturing wood chipboard or fibreboard or their substitutes
EP0616882A1 (de) * 1993-03-23 1994-09-28 Leinhaas Umformtechnik GmbH Verfahren zur hydraulischen Ansteuerung einer Gelenk- oder Kniehebelpresse und Gelenk- oder Kniehebelpresse mit einer Steuerung adaptiert für das Ausführen des Verfahrens
TWI382913B (zh) * 2010-09-01 2013-01-21 Long Iong Wu 十連桿型雙肘節鎖模機構

Also Published As

Publication number Publication date
CH498701A (it) 1970-11-15
DE2019919A1 (de) 1971-01-28
GB1296140A (enrdf_load_stackoverflow) 1972-11-15
DE2019919B2 (de) 1975-06-12
FR2056141A5 (enrdf_load_stackoverflow) 1971-05-14
ES378119A1 (es) 1972-05-16

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