US2475394A - Link mechanism for pressure casting machines - Google Patents

Link mechanism for pressure casting machines Download PDF

Info

Publication number
US2475394A
US2475394A US647259A US64725946A US2475394A US 2475394 A US2475394 A US 2475394A US 647259 A US647259 A US 647259A US 64725946 A US64725946 A US 64725946A US 2475394 A US2475394 A US 2475394A
Authority
US
United States
Prior art keywords
link
movement
die plate
members
pressure casting
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
Application number
US647259A
Inventor
Lester Nathan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lester Engineering Co
Original Assignee
Lester Engineering Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Lester Engineering Co filed Critical Lester Engineering Co
Priority to US647259A priority Critical patent/US2475394A/en
Application granted granted Critical
Publication of US2475394A publication Critical patent/US2475394A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/64Mould opening, closing or clamping devices
    • B29C45/68Mould opening, closing or clamping devices hydro-mechanical
    • B29C45/681Mould opening, closing or clamping devices hydro-mechanical using a toggle mechanism as mould clamping device
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00Machine element or mechanism
    • Y10T74/18Mechanical movements
    • Y10T74/18888Reciprocating to or from oscillating
    • Y10T74/1892Lever and slide
    • Y10T74/18952Lever and slide toggle transmissions
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00Machine element or mechanism
    • Y10T74/18Mechanical movements
    • Y10T74/18992Reciprocating to reciprocating

Description

July 5, 1949. N, LESTER 2,475,394
LINK MECHANISM FOR PRESSURE CASTING MACHINES Filed Feb. 15, 1946 2 Sheets-Sheet l INVENTOR. NATHAN LESTER la Z ya@ E' ATTORNEYS l VJuly 5, 1949.
, N. LESTER LINK MECHANISM FOR PRESSURE CASTING MACHINES Filed Feb. 13, 1946 2 Sheets-Sheet 2 INVENTOR.
NATHAN LESTER ATTORNEYS Patented July 5, 1949 LINK MECHLNISM FOR PRESSURE CASTING MACHINES Nathan Lester, Shaker Heights, Ohio, assignor to Lester Engineering Company, Cleveland, Ohio, a corporation of Ohio Application February 13, 1946, Serial No. 647,259
(Cl. i4- 110) 4 Claims.
The present invention relates to improvements in a link mechanism for imparting the final high pressure closing movement to the die plates of a pressure casting machine. In such machines the die plates carry the mold members or die blocks in which the mold cavity is formed when such die plates are in closed position and into which cavity the material to be cast is forced under very high pressure. The die plates must therefore be held in a closed position under a relatively great force which is sufficient to withstand the casting pressure tending to open them. Heretofore, toggle link mechanisms having wedge means associated therewith have been utilized to acquire this high pressure final closing movement. However, in these prior devices the wedge means have been usually engaged only in line contact with one another except at the last instant of the nal closing movement, at which time they finally engage in surface contact with one another. Thus, even small forces applied through these Wedge means prior to the last instant of the final closing movement impart extremely high unit stresses in the engaging portions of the wedge means with the result that the wedge means will be deformed or will score or seize with one another or otherwise be rendered inefficient.
It is one of the principal objects of this invention to provide in such a toggle link mechanism wedge means which, when engaged, continuously engage one another in surface contact during the entire final closing movement, thereby materially reducing the unit stresses on the wedge means and thus minimizing the damage to the wedge means and also permitting application of much greater forces during the nal closing movement.
Another object of this invention is to provide means wherein the area of surface contact between the wedge means increases as the closing force on the die plates increases.
Another object of this invention is to provide simple means for accomplishing the aforesaid continuous surface contact without requiring the use of complex universally mounted wedge means.
Additional objects and advantages of the invention will become apparent as the following description proceeds.
To the accomplishment of the foregoing and related ends, said invention then comprises the features hereinafter fully described and particularly pointed out in the claims, the following description and the annexed drawings setting forth in detail certain illustrative embodiments of the invention, these being indicative, however, of but a few of the various ways in which the principle of the invention may be employed.
1n the drawings:
Fig. 1 is a front elevation view partly in vertical section of that portion of a pressure casting machine containing the die plate actuating mechanism, such mechanism having been operated to fully close the die plates;
ig. 2 is similar to Fig. 1 except that the die plate actuating mechanism has been operated to fully open the die plates;
Fig. 3 is a vertical cross section of the actuating mechanism taken along line 3 3 of Fig. 1;
Fig. 4 is a plan view of the actuating mechanism as viewed from the top of Fig. 1;
Figs, 5 and 6 are enlarged views partially schematic of the link mechanism just prior to commencement of the final closing movement of the die plates, and at the last instant of the final closing movement, respectively; and
Fig. 'l is a schematic enlarged view of the link mechanism clearly showing the relationship between the wedge means of the link mechanism for accomplishing the objects of this invention.
Referring now to the drawings, the machine as a whole includes a frame l which reciprocably carries a die plate 2 and which die plate, as is well known to those skilled in the art, carries a die block engageable and disengageable with a die block and die plate, not shown, nxedly mounted on the frame l. Reciprocating movement of the die plate 2 is effected by means of a hydraulic piston and cylinder assembly 3 having the piston rod portion 6 connected thereto. The piston and cylinder assembly 3 is provided with passages i and 5 and by means of suitable valves, not shown, fluid under pressure can be directed at will to either end of the cylinder to move the piston therein in opposite directions. The connection of piston rod 6 to the die plate 2 is effected through a toggle link mechanism which linkage is arranged in cooperation with the frame i to effect movement of the piston rod and die plate rapidly in unison during the opening and closing movements, but with very great relative movement during the final closing and initial opening move- 3 ments to attain the great mechanical advantage necessary in order to eifect nal closing of the die plates with very high pressure.
The toggle linkage comprises links l' and 8 pivotally connected to one another and to the piston rod 6 and die plate 2, respectively. As shown, one end of each link 'I is pivotally connected to the die plate 2 about a pivot pin 9 which passes through the link 1 and through the spaced ear portions I on the die plate. Each of the ear portions I0 has a hardened metal insert il secured4 thereto in engagement with 'a hardened metal insert I-'2 secured to each 'link 1. The faces of inserts II and I2 which are in engagement with one another are cylindriform with each pivot pin 9 as an axis. As will become-more apparent as the description proceeds, a shearing,
stress on the pins 9 will be relieved or limited by the bearing or compressionstress taken. up bythe engagement of these inserts with one an'- other. Each link 'I has a laterally projecting leg iS thereon, the end of which is engageable with a corresponding leg on the other link l to limit the pivotal movement of., the links 'l toward one another. Each link 'I is' also provided with two shelf vportions =`I`3, slidably engageable With'correspending-shelf portions I-'YI in the frame -I. A wear strip-I is secured to each shelf I3 to take up the wear between the -shelf lportions of the links r'l and the frame I.
A plurality o'f links f8' are vpvotally connected about pivot pins I1 and I8 to the links-l and to ahead I8, respectively, which head is secured to the .piston lrod. .Hardened metal `inserts 2t 'between the links fl-Jandia operate lto relieve or limit "the shearing stress-onpins I1 as described above in relation to pin eandinserts lfI and I2.
VSecured"to frame I andi to the vouter ends of linksil are 'hard'ened-metal'wedge inserts Z'I and 22, respectively. For thel present, let `it suffice to say that asthe llinks l'I'.are swung outwardly about pins '9, the insertsi. and 22` will engage one another to effect relative lmovement between the framel and the die plate f2.
As :for the .'generalzoperaition .of the .toggle linkage, letLusassumethatz'die plate 2 is fully opened asshownin Fig; .2. 1n this-positionlinks .'I are collapsed inwardly Ywith .legs .'IH'fthereof vin' engagement and 'with the shelf portions I3 of 'the links in .engagement with the Ishelf portions I4 inthe 'frame -I.; Now, if1it '.bedesired to move the die plate-2 toward the :right 'toa closed position into engagement 'with .the l'other die plate, not shown, :pistonrod 6=iscaused to be'rnoved toward the right. In :so doing, the :piston .rod 6 and die plate :2 willmove in Iunisonsby reason lof the fact that links 7 are constrained ,bythe shelf portions SI 4 'from being :swung .outwardly `by the .force appliedto the links-,28. However, as soonzas the die plate-'2 lightly :engages the other die plate and the shelf portions I3 andM vdisengage from one vanother :and v.the inserts 2| and 2 2. lare iin the position `shown 'in Fig. .5, .further movement of the piston rod i5. toward-:the right will, throughV thelinks 8, cause the :links 'I to :be swung outplate-2. .The fnalizclosjed.' `position ofpthedie plate. is .attained fwhenthe, links Tf'and-fbearerelationn 4 to one another, as shown in Figs. 1 and 6. In Fig. 6, the distance through which die plate 2 has been moved relative to the frame I during the final closing movement is indicated by the dimension line 30.
To clearly set forth the principal feature of this invention, reference will now be made primarily to Fig. 7 and also to Figs. 5 and 6 which schematically show the relation of the surfaces of the inserts 2l and 22 to one another and to the axis of pin 9. Inasmuch as the movement between frame I` and die plate 2 is relative, the following description, in order to simplify and clarify the same, will proceed on the assumption that frame I is movable and that die plate 2 is fixed. When the inserts 2l and 22 are in the position` shown in Fig. 5 and as shown in full lines in Fig. 7, the axes 23 of the cylindrical faces Z4 and 25 of the inserts are coincident but eccentric 'of' the axis 26 'of pin Si. The relative movement between frame I and the die plate is indicated in lamount land direction by the dimension 2? and the straight line 28. Thus, at the attainment of the final closing movement, axis 23 will have moved to positionA. New, in order that surface 25 will engage surface 2li in surface cer;- taot as the linkl rotates about axis 25,'it is necessary that axis 23 of surface 25 always be coincident with axis23of surface 24. From a theoretic standpoint, thiszcan be accompiishedoniy by moing vaxis 23 of surface 25' in a straight line 28 as does the axis 23 `of surface 2t. However, from a practical standpoint',fsuchcan be satisfactorily accomplished by selectingthe axis 2B along a line which is the perpendicular bisector rof y'the lim 28. In such `case,axis '2'3 of surface 25 will move in a circular 'path .29 -of radius equal to the e2- centric'ityvof the axis S23 with respect to the 2t, as the link l is 'rotated about axis 25. For
.' small amounts of vrelative movement, the clrcuiar path .2Q-Will at allv times bet veen the `limits o line 28 be so nearly straight that for all practical purposes, axesy 23 ofthe .surfaces 2li and 2:5 will be coincidentrduring movement. of the insert 22 .from'the-solidiline .position 'to the Ldotted line position. Naturally, as the ratio of the eccentricity to .the .amount of. relative vmovement approaches infinity, the path. of the axs which describes facircul'ar `path `will approach a straight line path. v
Tn "an actual machine, :thexrelative movement during the `final :closingmovement is fon Vthe order of 'only .several `thousandths lof aniin'ch iand there fore the error due vtothe theoretical noni-'c ncidence iof 'the .axes 23Y can 'be ,disregarded and it canbefconsidered, as :apractical matter, that surface 25 will 'engagesurface 24 .in'surface 'Contact throughout `its "movement v.from the solid line position to ther 'dotted line position of Fig. 7. Thus, ;it "will .be seen that as l.tim-'closing force increases', .the 'area::df'surfaees 2id 'and 25 in contact. likewise .increases .andbecause there is vsurface contact, as` distinguished from line contact, much greater forces vcan Vbe transmitted to the die plate 2 Without vcausing .damage vor excess Wear tothe inserts 121i and 22;
Other imodes of applying 'the principle of the invention may lbeuemployed', change .being made as regards 'the 'detailsdescribed,V provided the features stated in :anyfof 'the following claims or the equivalent of such .be 'employed and 'while described with particular reference to its 'use in a Apressure ycastingmachine, .it will. be understood that mylimprnyedlinkmeenanism imay 'be used y'in' fconjunction, any: mainline for f'device" wherein it is desired to impart high pressure relative movement between two relatively movable members.
I therefore particularly point out and distinctly claim as my invention:
1. In a linkage mechanism for pressure casting machines and the like, the combination with two relatively movable members of a link pivotally connected to one of said members for swinging movement into abutting engagement with the other of said members, said link and other member being formed with abutting cylindrical surfaces bearing fixed relation to said link and other member respectively, the axes of such surfaces being disposed eccentrially of the pivot axis of said link and coinciding during swinging movement of said link as aforesaid.
2. In a linkage mechanism for pressure casting machines and the like, the combination with two relatively movable members of a link pivotally connected to one of said members for swinging movement into abutting engagement with the other of said members, said link and other member being formed with abutting cylindrical surfaces bearing iixed relation to said link and other member respectively, the axes of such surfaces being disposed eccentrically of the pivot axis of said link and coinciding during swinging movement of said link as aforesaid, the pivot axis of said link lying on a line perpendicularly bisecting the line of relative movement of said members effected by swinging of said link as measured by the line of movement of the axes of the abutting surfaces of said link and other member relative to the pivot axis of said link. l
3. In a linkage mechanism for pressure casting machines and the like, the combination with two relatively movable members of a link pivotally connected to one of said members for swinging movement to a wedged position between said members, said link and the other of said members being formed with abutting cylindrical surfaces bearing xed relation to said link and other member respectively, the axes of such surfaces being eccentric of the pivot axis of said link and coinciding when said link is in a position with its cylindrical surface adjacent that of said other member and during movement of said link to a wedged position between said members.
4. In a linkage mechanism for pressure casting machines and the like, the combination with two relatively movable members of a link pivotally connected to one of said members for swinging movement to a wedged position between said members, said link and the other of said members being formed with abutting cylindrical surfaces bearing xed relation to said link and other member respectively, the axes of such surfaces being eccentric of the pivot axis of said link and coinciding when said link is in a position with its cylindrical surface adjacent that of said other member and during movement of said link to a wedged position between said members, the pivot axis of said link lying on a line perpendicularly bisecting the line of relative movement of said members effected by swinging of said link from a position with its cylindrical surface adjacent that of said other member to a position wherein said link is wedged between said members.
NATHAN LESTER.
REFERENCES CITED The following referenlces are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 494,502 Whitacre Mar. 28, 1893 638,990 Replogle Dec. 12, 1899 972,689 Gillespie Oct. 11, 1910 2,186,030 Lester Jan. 9, 1940
US647259A 1946-02-13 1946-02-13 Link mechanism for pressure casting machines Expired - Lifetime US2475394A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US647259A US2475394A (en) 1946-02-13 1946-02-13 Link mechanism for pressure casting machines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US647259A US2475394A (en) 1946-02-13 1946-02-13 Link mechanism for pressure casting machines

Publications (1)

Publication Number Publication Date
US2475394A true US2475394A (en) 1949-07-05

Family

ID=24596262

Family Applications (1)

Application Number Title Priority Date Filing Date
US647259A Expired - Lifetime US2475394A (en) 1946-02-13 1946-02-13 Link mechanism for pressure casting machines

Country Status (1)

Country Link
US (1) US2475394A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2841119A (en) * 1949-12-12 1958-07-01 Segerstad Carl Gustaf Hard Af Operating mechanism
DE1136454B (en) * 1954-08-11 1962-09-13 Madison Kipp Corp Device for locking die casting molds using toggle levers
US3094031A (en) * 1958-04-10 1963-06-18 Pfaff Ag G M Electromagnetic cutting knife and the like actuating mechanism
DE1255243B (en) * 1962-07-16 1967-11-30 Vinzenz Von Reimer Injection or die casting machine
DE1265354B (en) * 1963-05-10 1968-04-04 Vinzenz V Reimer Injection or die casting machine
US4563143A (en) * 1983-04-19 1986-01-07 Kb Cold Isostatic Press Systems Cips Isostatic press

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US494502A (en) * 1893-03-28 whitacke
US638990A (en) * 1898-08-05 1899-12-12 Mark A Replogle Sliding toggle.
US972689A (en) * 1909-10-23 1910-10-11 James Gillespie Riveting-machine.
US2186030A (en) * 1937-04-30 1940-01-09 Lester Engineering Co Toggle link

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US494502A (en) * 1893-03-28 whitacke
US638990A (en) * 1898-08-05 1899-12-12 Mark A Replogle Sliding toggle.
US972689A (en) * 1909-10-23 1910-10-11 James Gillespie Riveting-machine.
US2186030A (en) * 1937-04-30 1940-01-09 Lester Engineering Co Toggle link

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2841119A (en) * 1949-12-12 1958-07-01 Segerstad Carl Gustaf Hard Af Operating mechanism
DE1136454B (en) * 1954-08-11 1962-09-13 Madison Kipp Corp Device for locking die casting molds using toggle levers
US3094031A (en) * 1958-04-10 1963-06-18 Pfaff Ag G M Electromagnetic cutting knife and the like actuating mechanism
DE1255243B (en) * 1962-07-16 1967-11-30 Vinzenz Von Reimer Injection or die casting machine
DE1265354B (en) * 1963-05-10 1968-04-04 Vinzenz V Reimer Injection or die casting machine
US4563143A (en) * 1983-04-19 1986-01-07 Kb Cold Isostatic Press Systems Cips Isostatic press

Similar Documents

Publication Publication Date Title
US2371547A (en) Pressure exerting mechanism
US4206799A (en) Oblique core locking mechanism for die casting machines
US3345691A (en) Injection molding machine
US4027726A (en) Pressure die-casting block with a venting valve
US2475394A (en) Link mechanism for pressure casting machines
US4013392A (en) Injection moulding machines
US3262158A (en) Injection or pressure fusion machine
US2309460A (en) Pressure casting machine link mechanism
US2914362A (en) Guide system for reciprocating machine parts
US3183555A (en) Locking means for the mold closing plate of injection molding machines
US4511127A (en) Hydraulic-mechanical clamping device
US3765812A (en) Mold clamping mechanism for molding machine
US3667890A (en) Press
US2335807A (en) Mold locking mechanism
US3353221A (en) Locking device for injection molding apparatus
US2298043A (en) Molding machine
US4631014A (en) Hydraulic curing press
US3015131A (en) Clamping mechanism for molding press
US2649621A (en) Molding machine
US2407978A (en) Toggle system for injection molding machines
US3014243A (en) Injection molding machine
US2371041A (en) Method of and device for forging
US3587138A (en) Mould-closing device
US2797455A (en) Die casting machine
US3579742A (en) Clamping mechanism for molding machine