US3469879A - Tong device for metal scrap blocks - Google Patents

Tong device for metal scrap blocks Download PDF

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Publication number
US3469879A
US3469879A US633105A US63310567A US3469879A US 3469879 A US3469879 A US 3469879A US 633105 A US633105 A US 633105A US 63310567 A US63310567 A US 63310567A US 3469879 A US3469879 A US 3469879A
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United States
Prior art keywords
block
tong
wire
arms
furnace
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Expired - Lifetime
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US633105A
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English (en)
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Kunitoshi Tezuka
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Individual
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
    • B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
    • B66C1/42—Gripping members engaging only the external or internal surfaces of the articles
    • B66C1/422—Gripping members engaging only the external or internal surfaces of the articles actuated by lifting force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
    • B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
    • B66C1/42—Gripping members engaging only the external or internal surfaces of the articles

Definitions

  • the present invention involves a device for supporting scrap metal blocks by means of tong arms for introduction within a furnace in which the blocks are to be melted, the construction of the device being such that the blocks are readily released by the device when deposited in the furnace whereafter the device is removable from the furnace without damaging the walls of the furnace.
  • cables, wires, chains and the like have generally been used for supporting and transporting metal scrap blocks for introduction into a furnace.
  • the metal scrap block is first held by such cables and then the block thus held is elevated and transported to an electric furnace by crane means.
  • molten metal which is usually present at the bottom of the furnace, will adhere to the supporting cables should the block thus suspended be lowered to engage the bottom of the electric furnace, and hence the cables may be rendered useless for their intended use or alternately the furnace bottom may be damaged due to shocks resulting from blocks dropping into the furnace should the cables be removed from the block before the latter reaches the pool of molten metal at the furnace bottom.
  • it will obviously be difiicult to suspend a scrap block in a desired position in the electric furnace.
  • the present invention comprises a device for supporting metal scrap blocks.
  • the device has a plurality of tong arms each having opposite ends one of which is formed with an offset portion adapted to engage a surface of a scrap block.
  • the device further includes a plurality of pairs of pivotally connected toggle links, the end of each tong arm opposite said one end thereof being pivotally connected to a separate one of said plurality of toggle links at said pivotal connection thereof.
  • Each of the tong arms has an intermediate portion thereof mounted for movement about a fixed pivot when the free ends of each of said pairs of toggle links are moved toward and away from each other, means being provided for so moving the free ends of each of said pairs of toggle links.
  • each of said tong arms is mounted on a unitary frame for movement about the fixed axis.
  • Also for moving the free ends of each of the pairs of toggle links I preferably provide a pair of spaced apart movable members with one of the free ends of each of the pairs of toggle links being fixedly connected to one of said pair of members, the other free ends of each of the pairs of toggle links being fixedly connected to the other of said pair of members.
  • the pivotal connection between the toggle links and one end of the tong arm will cause the other end of each tong arm to move about its fixed pivot in the frame in a direction to move 3,469,879 Patented Sept. 30, 1969 the tong arms inwardly into a position to grasp a scrap block incident to its placement in a furnace, and when one of the members is moved away from the other, the laterally offset end of the tong arms will be moved outwardly to a position in which the block is released enabling withdrawal of the device from a furnace after the block has been deposited therein by the device of the invention.
  • the members are moved relatively to one another by cables the operation of which can be simply controlled to ensure from damage to either tong arms while in the furnace or to the walls of the furnace when either introducing the device into or removing it from the furnace.
  • the device of the invention has particular utility when utilized in conjunction with a cylindrical scrap block formed with longitudinal recesses in the outer periphery thereof.
  • the tong arms which are preferably tapered down toward the offset end portion of the arm, have a maximum width which is equal to or less than the width of the recesses formed in the block.
  • Preferably more than three tong arms are provided while the length and width thereof will obviously depend upon the shape and dimensions of the metal scrap block to be supported and transported by the device in accordance with the invention.
  • FIG. 1 is a front view of the device in accordance with the invention.
  • FIG. 2 is a vertical section taken through line II-II of FIG. 1;
  • FIG. 3 is a horizontal section taken through line IIIIII of FIG. 1;
  • FIG. 4 is a vertical section of the tong arm portion of the device illustrating the use of the device with a slotted metal scrap block;
  • FIG. 5 is a perspective view of a slotted metal scrap block
  • FIG. 6 is a partly cut away, enlarged, front view of another embodiment of a device in accordance with the invention.
  • FIG. 7 is a schematic illustration of the device of the invention in conjunction with a metal scrap block in position in a regenerative furnace.
  • the device of the invention includes a shaft 1 having opposite threaded ends and to which is secured at the upper end thereof an upper plate 2 and at the lower end thereof a lower plate 4, by means of nuts 2a, 4a respectively.
  • the shaft 1 slidably guides a sliding plate 3 disposed substantially parallel and between the upper and lower plates 2 and 4.
  • On the top of said upper plate 2 there is provided a projecting ring 5 with which hook 22a of a wire cable 22 suspended from an overhead crane apparatus C (see FIG. 7), is engaged.
  • two rings 14 which are interconnected by means of a traction wire 23 adapted to be engaged by a hook 24a of another wire cable 24 suspended from the crane apparatus.
  • the sliding plate 3 and lower plate 4 are preferably identically shaped, each having in the disclosed embodiment, four arms, plate 3 being provided with arms 6 and plate 4 being provided with arms 9, the arms 6 and 9 being equally spaced with respect to one another.
  • plates 3 and 4 will. be formed with arms the numbers of which will correspond to the number of tong arms.
  • toggle joint means which in the present embodiment consists of four pairs of links, each pair of links being pivotally connected by pivots 13.
  • Each pair of links comprises link 7 on the one hand and link 10' on the other hand, link 7 and link 11 ⁇ preferably being of the same length.
  • the free end of link 7 of each pair of links is pivotally connected to the arms 6 of the sliding plate 3 by means of pins 8, while the free end of the other link 10 is pivotally connected to the arms 9 of the lower plate 4 by means of pins 11.
  • tongs 12 are provided each being of a bell crank form and each comprising longer arm portion 12a and shorter arm portion 12b whose end is pivotally connected by means of pivots 13 to the pivotally connected ends of each of the pairs of links 7, 10.
  • the end of the long arm portion 12a is laterally offset to form a hook for engaging a metal scrap block.
  • a frame 15 which is generally annular and which is provided with arms 17 which are slotted 18, the arms 1'7 being equally spaced from one another.
  • an intermediate portion of the tongs 12 is fixedly pivotally connected to the arms 17 of frame 15 by means of pins 19.
  • the ring of the upper plate 2 is engaged by the hook 22a suspended from wire 22 in turn suspended from an overhead crane apparatus C mounted on traverse rails R.
  • the traction wire 23 is engaged by hook 24a provided on wire cable 24 of the crane apparatus.
  • the device of the invention is lifted by winding wire 22 by means of a winch of the crane apparatus and is moved to a position over a metal scrap block.
  • wire 24 is wound by the winch the sliding plate 3 is moved upwardly on shaft 1 thereby causing the end of link 7 connected to plate 3 to be moved away from link 10.
  • the wire 24 is again wound, and, as previously described, when wire 24 is wound each of said tongs 12 will be moved away from each other to release its hold on the block. Thereafter, the wire 22 is again wound to effect removal of the device from the block and the furnace.
  • each tong arm may be effected in narrow furnaces without damage to the furnace wall.
  • FIG. 5 is shown a metal scrap block Ba which is cylindrical and provided with a plurality of slots or recesses of substantially the same depth, each slot extending longitudinally of the block.
  • the device shown in the foregoing FIGURES 1, 2 and 3 may be utilized except as shown in FIG. 4, the longer arm 25a of the tongs 25 is tapered inwardly to a greater extent than with the device of FIGS. 1 to 3.
  • the wider part of the upper portion of arm 25a is substantially as wide as the depth of slot 21 in the metal scrap block Ba.
  • the tong arm will not project from the slot.
  • the tongs may be moved into and out of engagement with the block Ba entirely within the slotted section of the block.
  • maximum volume blocks can be placed in the furnace by following the sequence of operation heretofore described and accordingly the production rate may be greatly increased.
  • the FIG. 4 embodiment operates and is utilized in the same manner as that of the previously described embodiment.
  • FIG. 6 illustrates a still further embodiment of the invention, the general construction of which is similar to the device of FIGURES 1, 2 and 3, the difference being the provision of an additional traction means for positively lowering the sliding plate 3 for moving tongs 12 to a holding position.
  • the sliding plate 3 is provided with rings 27 on each of the two opposing sides of the plate 3. Additionally, two rollers 28 are carried by lower plate 4 on each of the two opposing sides thereof.
  • a traction wire 29 is connected to one of the rings 27 on one side of plate 3, is then passed over one of the pairs of rollers 28 on that side of the plate 4 whereafter wire 29 is drawn upward, reversedly bent, passed over the other pair of rollers 28 on the other side of plate 4 for connection to ring 27 on such other side of the plate.
  • the traction wire 29 is engaged by hook 30a of a further wire cable 30 suspended from the crane apparatus.
  • wire cable 30 may be reversely wound about a hoist drum (not shown in the drawings) associated with the winch for wire cable 24.
  • the upper plate 2, sliding plate 3 and lower plate 4 are each provided with rings 31 for guiding movement of traction wire 29.
  • each of the tongs 12 may be moved outward by elevating wire 23 as in the previously described embodiments, and the tongs can be positively closed by elevating wire 29.
  • FIG. 4 The arrangement described with respect to FIGURE 6 may obviously also be used in the FIG. 4 embodiment for positively moving slide plate 3 downwardly after it has been elevated by the traction wire.
  • a device for supporting scrap blocks comprising a plurality of tong arms each having opposite ends one of which is formed wtih an offset portion adapted to engage a surface of a scrap block, a plurality of pairs of pivotally connected toggle links, the end of each tong arm opposite said one end thereof being pivotally connected to a separate one of said plurality of toggle links at said pivotal connection thereof, and an annular frame, each of said tong arms having an intermediate portion directly and fixedly pivotally connected to the frame for movement about a fixed pivot when the free ends of each of said pairs of toggle links are moved toward and away from each other, and means independent of the frame for so moving the free ends of each of said pairs of toggle links, said moving means comprising a pair of substantially parallel spaced apart relatively movable members, one of the free ends of each of the pairs of toggle links being fixedly connected to one of said pair of members, the other free ends of each of the pairs of toggle links being fixedly connected to the other of said pair of members.
  • a device including a movable shaft for guiding movement of one of said members relative to said shaft, a ring structure being mounted on said shaft and being adapted for engagement with a crane hook and said one of said members being operatively connected to traction means for moving said one of said members relative to said shaft and independently of the other of said pair of members fixedly attached to said shaft for movement therewith.
  • each tong arm is tapered toward said one end thereof, said arm having a width no greater than the depth of slots in the scrap blocks adapted to be supported by said oflset portion of each of said arms.
  • said traction means comprise traction cables coupled to rings mounted on said one of said members the arrangement being such that when said traction means is under traction said one of said members is moved upward to cause said opposite ends of each of the tong arms, by virtue of the connection of said tong arms to said toggle links and to said frame, to move outwardly away from one another, said tong arms being moved inwardly toward one another by virtue of the weights of said tong arms and said one of said members.
  • said traction means comprise traction cables, one of which is operatively connected to said one of said members for raising the same and another of which is operatively connected about rollers at the lower end of said shaft for lowering said one of said sliding members.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Crushing And Grinding (AREA)
US633105A 1966-12-29 1967-04-24 Tong device for metal scrap blocks Expired - Lifetime US3469879A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8566066 1966-12-29

Publications (1)

Publication Number Publication Date
US3469879A true US3469879A (en) 1969-09-30

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ID=13864966

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US633105A Expired - Lifetime US3469879A (en) 1966-12-29 1967-04-24 Tong device for metal scrap blocks

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US (1) US3469879A (da)
AT (1) AT287242B (da)
BE (1) BE706112A (da)
CH (1) CH497336A (da)
DE (1) DE1506542C2 (da)
DK (1) DK118738B (da)
ES (1) ES339271A1 (da)
FI (1) FI46614C (da)
FR (1) FR1543659A (da)
GB (1) GB1163986A (da)
LU (1) LU54795A1 (da)
NL (1) NL6706648A (da)
NO (1) NO121358B (da)
SE (1) SE323183B (da)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4336962A (en) * 1980-10-24 1982-06-29 Read Owen R Adjustable lifting tong
US4728137A (en) * 1986-07-22 1988-03-01 American Engineering And Trade, Inc. Compound toggle robotic gripper
US5284375A (en) * 1993-03-12 1994-02-08 Ingersoll-Rand Company Single actuation rod gripping mechanism
US20060266208A1 (en) * 2004-03-18 2006-11-30 Tda Armement Sas Device for transporting a mortar-type heavy weapon on a light all-terrain vehicle
CN103395686A (zh) * 2013-07-17 2013-11-20 无锡乘风新能源设备有限公司 风电叶片用夹具工装

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2659311B1 (fr) * 1990-03-12 1992-05-22 Potain Sa Dispositif motorise de prehension de charge a commande a distance.
DE19750784C2 (de) * 1997-11-06 2002-07-11 Mannesmann Ag Lastaufnahmemittel
ITMI20011932A1 (it) 2001-09-14 2003-03-14 Dante Bruno Priuli Struttura di pinza per il trasporto di rotoli di tondino
DE102005022990B4 (de) * 2005-05-19 2007-08-02 Dbe Technology Gmbh Vorrichtung zum Ergreifen von Kokillen
FR2939452B1 (fr) * 2008-12-09 2012-12-28 Sade Cie Generale De Travaux D Hydraulique Pince pour saisir une plaque de revetement de voirie.
CN103466437A (zh) * 2013-09-11 2013-12-25 颜从均 一种圆柱件的专用吊取装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE516642A (da) *
US1111322A (en) * 1914-04-27 1914-09-22 Wellington Randall Lifting-tongs.
US1974892A (en) * 1932-11-30 1934-09-25 Canal Storage Company Inc Brick lifter
US2588733A (en) * 1948-01-12 1952-03-11 Knox Albert Aerial transporter

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1144387A (en) * 1915-03-10 1915-06-29 Harry E Skelton Grapple.
GB227548A (en) * 1923-11-17 1925-01-22 Joseph Saltern Detachable sling for lifting and lowering black plates and other goods
US3033605A (en) * 1960-12-13 1962-05-08 Jr John Morrow Expansion-type grapple for lifting and carrying loads

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE516642A (da) *
US1111322A (en) * 1914-04-27 1914-09-22 Wellington Randall Lifting-tongs.
US1974892A (en) * 1932-11-30 1934-09-25 Canal Storage Company Inc Brick lifter
US2588733A (en) * 1948-01-12 1952-03-11 Knox Albert Aerial transporter

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4336962A (en) * 1980-10-24 1982-06-29 Read Owen R Adjustable lifting tong
US4728137A (en) * 1986-07-22 1988-03-01 American Engineering And Trade, Inc. Compound toggle robotic gripper
US5284375A (en) * 1993-03-12 1994-02-08 Ingersoll-Rand Company Single actuation rod gripping mechanism
US20060266208A1 (en) * 2004-03-18 2006-11-30 Tda Armement Sas Device for transporting a mortar-type heavy weapon on a light all-terrain vehicle
CN103395686A (zh) * 2013-07-17 2013-11-20 无锡乘风新能源设备有限公司 风电叶片用夹具工装

Also Published As

Publication number Publication date
DE1506542B1 (de) 1969-09-18
LU54795A1 (da) 1968-01-31
GB1163986A (en) 1969-09-10
NL6706648A (da) 1968-07-01
SE323183B (da) 1970-04-27
BE706112A (da) 1968-03-18
DK118738B (da) 1970-09-28
AT287242B (de) 1971-01-11
NO121358B (da) 1971-02-15
CH497336A (fr) 1970-10-15
FR1543659A (fr) 1968-10-25
FI46614B (da) 1973-01-31
DE1506542C2 (de) 1970-06-11
FI46614C (fi) 1973-05-08
ES339271A1 (es) 1968-05-01

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