US3838589A - Discard removing device for an extrusion press - Google Patents

Discard removing device for an extrusion press Download PDF

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Publication number
US3838589A
US3838589A US00328277A US32827773A US3838589A US 3838589 A US3838589 A US 3838589A US 00328277 A US00328277 A US 00328277A US 32827773 A US32827773 A US 32827773A US 3838589 A US3838589 A US 3838589A
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Prior art keywords
extrusion
gripping
discard
axis
gripping means
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US00328277A
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English (en)
Inventor
O Behrendt
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Schloemann AG
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Schloemann AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C35/00—Removing work or waste from extruding presses; Drawing-off extruded work; Cleaning dies, ducts, containers, or mandrels
    • B21C35/04—Cutting-off or removing waste

Definitions

  • ABSTRACT PP 328,277 The discard removing device is for removing the billet discard and extrusion disc from the extrusion axis 30 F A afterthe billet discard has been cut off from the re- 1 J a 53 pglca Pnomy Data 2204329 mainder of the extrusion.
  • the device has a pivotal ermany mounting frame which pivots towards and away from the extrusion axis and gripping jaws on the mounting CCll 72/257, 72/4B2'2i frame for gripping the discard; the gripping jaws are l Fie'ld 5 2 mounted on the mounting frameby means of a paral- 10/12 Z lel link WhlCh enables the gripping aws to move up and down, which parallel link can be tilted to enable References Cited ghviesgripping jflWS to be tilted away from the extrusion UNITED STATES PATENTS 3,129,818 4/1964 Behrendt 72 255 14 Clam, 9 Drawmg 32 31 1 38,3 30 4, A 78 21 49 4s 12 a f 46 79 76 26 47 i 7 ti 5 "X" 7 J" 48 1:" .J I 1' it g l 7 1 Z9 '-7'- ,23
  • the invention relates to a discard removing device on a horizontal metal extrusion and tube presse, particularly for flat sections of aluminium.
  • auxiliary devices for such presses, these devices being adapted to load into the press the billet and the extrusion disc disposed behind the billet and to remove the extrusion discard comprising the billet discard (also known as the butt) and the extrusion disc from the press after the billet is extruded from the billet container of the press and through the die.
  • the extrusion discard is removed it is also important to ensure that the extrusion discard is transferred reliably and in a precisely defined position to an extrusion discard cutting device which is disposed outside the press.
  • a heated billet is placed in the billet container of the extrusion press, an extrusion disc is po sitioned behind the billet to prevent the rear end of the billet sticking to the ram and a ram forces the material of the billet through the die, which can be of any suitable form.
  • the rear end of the billet and the extrusion disc are still behind the die and the rear end of the billet is integral with the extruded tube or section which extends out in front of the die and has its rear end in the die.
  • German Auslegeschrift No. 1,l4l,606 discloses an extrusion discard removing device in which a collecting dish is mounted on a pivoting arm which is disposed outside the press.
  • the said collecting dish may be lowered on the pivoting arm in such a way that it is able to pivot laterally into the press below the extrusion discard and is placed below the said discard after being raised.
  • the collecting dish is thrust vertically downward by the extrusion discard.
  • the collecting dish with the extrusion discard may pivot out of the middle of the press after the shears return into an upper position.
  • the collecting dish shown in that Specification is suitable only for circular sections. Grippers cannot be attached.
  • U.S. Pat. No. 3,129.818 discloses an extrusion discard removing device: comprising a first lever which can be hydraulically pivoted into the press at right angles to the extrusion axis. A further lever is pivoted to the upper end of the first lever and is approximately horizontally positioned and retained by a hydraulic cylinder when the main lever has been pivoted inwards, the free end of the second lever supporting a fixedly mounted collecting dish or catch-pan for the extrusion discard, the said dish also having spring-loaded grippers for gripping the extrusion discard.
  • This extrusion discard removing device may also be lowered by the second arm during the inward pivoting motion so that the grippers may pivot past the exposed extrusion discard and the collecting dish is disposed directly under the extrusion discard when the second arm pivots upwardly.
  • the collecting dish is de flected downwardly in a circular arc about the pivoting point of the second arm on the first (main) lever when the cropping operation is performed. Since flat billets are thrust downwardly when in the horizontal position while being cropped by the shears but the collecting dish with the grippers is downwardly deflected along a circular arc, it follows that the removing device would thrust a flat billet out of the grippers when moving downwardly. This results in an unreliable and undefinable position of the extrusion discard,
  • the present invention provides a discard removing device for a horizontal extrusion press, the device comprising:
  • gripping means for gripping the extrusion discard, for movement into and out of the zone of the extrusion axis as the mounting means is moved towards and away from the extrusion axis;
  • the invention extends to a horizontal extrusion press having a generally vertically downwardly movable cropping blade for cropping off the discard and a discard removing device in accordance with the invention for removing the discard from the extrusion axis,
  • the invention can provide an extrusion discard removing device, more particularly for flat billets of aluminium, which can be of simple construction and maintenance and can be moved into and out of the extrusion axis in a simple manner, which is also capable of reliably gripping the extrusion discard despite its varying dimensions resulting from the cropping operation.
  • the device of the invention is capable of removing the extrusion discard out of the press between the extrusion axis and the press frame by moving the mounting means away from the extrusion axis and supplying the discard in a precisely defined position to an extrusion discard cutting device, more particularly if the gripping means is pressure fluid actuated to improve retention of the extrusion discard in the gripping means and the gripping means yields vertically downwardly during the cropping operation due to the parallel link means and is tilted awayfrom the extrusion axis after a vertical (upwards) return motion or is tilted away from the extrusion axis during the vertical return motion.
  • the parallel link and tilting means comprises an upper, generally horizontal lever pivoted to said mounting means, the lever having its free, front end portion pivoted to the gripping means, and a generally vertical lever pivoted to the mounting means on the same pivot axis as that between the generally horizontal lever and the mounting means (which pivot axis can be formed by a pivot pin fixed to the mounting means), the generally vertical lever having its free lower end portion movably connected to (e.g., pivoted to) one end portion of a second generally horizontal lever whose other end is pivoted to the gripping means.
  • the up and down movement of the gripping means may be actuable by a double-acting pressure fluid pistoncylinder unit having two cylinder chambers of identical effective cross-sectional area, which chambers are interconnected by an e.g., adjustable restrictor but which interconnection can be closed.
  • the gripping means may comprise two spaced pairs of gripping jaws disposed one behind the other, which pairs ofjaws may be actuable by a single actuating unit by way of a lever compensating system so that the gripping action of each pair of jaws can be either the same or different;
  • the lever compensating system preferably comprises a two-armed compensating lever to the centre portion of which the single actuating unit is connected while the two end portions are connected (either directly or through intermediate members such as levers) by way of ball joints to the respective pairs of gripping jaws. This arrangement can ensure that both pairs of gripping jaws always act with substantially the same force and that they are able to grip dimensions of different magnitude.
  • Each of the pairs of gripping jaws may comprise two rocker levers which are pivoted to a carrying member such as a collecting dish which is provided with the gripping jaws, which rocker levers have respective toothed lower horizontal free ends. for instance in the form of segments. which mesh with each other and upper generally vertical free ends which carry gripping heads. Force need be applied to only one of the rocker levers because of the, e.g., segmented tooth coupling between the two rocker levers. If. as is preferred, the gripping heads are pivoted to the respective jaws.
  • the pivoted gripping heads can ensure that the full width of their, e.g., flat sides always bears flush on the stepped extrusion discs or on the billet discard which is usually slightly deformed by the cropping operation so that the discard and extrusion disc are reliably held.
  • the mounting means is preferably a frame to be disposed outside the press and pivotal about a stationary pivot axis which is parallel to the extrusion axis. i.e,, pivotable for movement in a plane perpendicular to the extrusion axis, the gripping jaws being mounted on the free upper end of the pivotal frame.
  • the mounting means is preferably arranged for pivoting through an angle of substantially between its two limiting positions to enable an extrusion discard of flat section to be set down in a vertical position in the cutting device outside the press.
  • the mounting means can move parallel to the extrusion axis; this is important if one extrusion program involves cutting the extrusion discard with shears and a standard die and another extrusion program operates with a bridge or chamber die, in which the extrusion discard is torn off axially from the section and in its entirety is longer and must be taken up in a different axial position by the gripping means.
  • FIG. I is a cross-section, looking in the extrusion direction, through part of a horizontal metal extrusion press, showing a discard removing device in accordance with the invention
  • FIG. 2 is a section through the discard removing device, along the line II-II in FIG. 1;
  • FIG. 3 corresponds generally to FIG. 1, but the full lines show the discard removing device with its frame pivoted inwards and with the collecting dish tilted down, while the broken lines show the discard ejection device with its frame pivoted outwards;
  • FIG. 4 likewise corresponds generally to FIG. 1, but shows the discard removing device with its frame pivoted inwards, with the collecting dish horizontal and with an extrusion discard gripped by the gripping means at the end of a cropping operation with the cropping shear in its lowest position;
  • FIG. 5 shows a detail of FIG. I, on an enlarged scale
  • FIG. 6 is a section through the force transmission lever of the gripping means, along the line VIVI in FIG. 5;
  • FIG. 7 is a plan view of the gripping means in the position shown in FIG. 8, on an enlarged scale;
  • FIG. 8 is a view corresponding generally to that of FIG. 5, but showing an extrusion discard gripped by the gripping means.
  • FIG. 9 is a view in the direction of the arrow A in FIG. 5, showing the lever Compensating system of the gripping device on an enlarged scale.
  • a base frame 4 is disposed adjacent to a horizontal metal extrusion press for extruding sections and tubes. Of the press, only part of the press frame 1, the tie rods or columns 2 joining the work holder and cylinder member of the press and a vertically acting cropping device 3 are shown.
  • the shaft 6 is pivotably supported in bearings 7 disposed in the base frame 4.
  • the pivoting frame 5 is pivoted into or out of the press by means of a lever 8, non rotationally mounted on the shaft 6, and a hydraulic cylinder 9 which is pivoted to the base frame 4.
  • An abutment 10 on the pivoting frame 5 limits the inward pivotal movement of the pivoting frame 5 by abutting the press frame 1.
  • a two'armed generally horizontal lever 12 is pivoted on a bolt 11 mounted on that end of the pivoting frame 5 which is uppermost and closest to the press.
  • the leading free end of the lever 12 is pivoted to an upper joint 13 of a collecting dish 14 (which forms part of gripping means) while the rear free end of the lever 12 is pivoted by means of a bolt 16 to a hydraulic piston-cylinder unit 17 (which may be referred to as a ram) which is in turn pivoted on the pivoting frame 5 by means of bolts 17.
  • a further, generally vertical, two-armed lever 19 is also pivotable about the bolt 11 mounted on the pivoting frame 5 while the upper free end of the lever 19 is pivoted at 18 to a further hydraulic piston-cylinder unit 21 which is pivoted to the pivoting frame 5 at a pivot 20, the lower free end being joined to a simple radius rod 22 by means of a bolt 23.
  • the other end of the radius rod 22 is pivoted to the collecting dish 14 at a lower joint 24 by means of a bolt 25.
  • the levers l2 and 19 and the radius rod 22 form a combined parallel link and tilting means.
  • the collecting dish 14 is displaced parallel either upwardly or downwardly.
  • the two cylinder chambers of the piston-cylinder unit 17 are of identical area and are provided with a double-acting piston and communicate with each other through an adjustable restrictor 28 disposed between ducts 26 and 27 (see FIG. 1). This permits parallel and slow lowering of the collecting dish 14 under the thrust applied by the cropping device 3. Communicationbetween the ducts 26 and 27 and therefore through the restrictor 28 may be opened and closed by means of a valve 15.
  • the cylinder spaces of the piston-cylinder unit 17 are supplied with hydraulic fluid by way of the respective ducts 26 and a direction valve 59.
  • the collecting dish 14 is of L-shape.
  • the upper joint 13 at which the two-armed lever 12 is pivoted to the collecting dish 14 provides a vertical part
  • the lower joint 24 at which the radius rod 22 is pivoted to the collecting dish and an extrusion discard support 29 provides the horizontal part.
  • the extrusion discard support 29 is constructed so that it is able to retain an extrusion discard from a round billet 48 as well as an extrusion discard from a flat billet 49.
  • a further hydraulic piston-cylinder device 30 is hinged by means of trunnions 31 on the vertical part of the collecting dish 14.
  • the end of the piston rod 32 of the piston-cylinder device 30 (see FIG. 9) is provided with a clevis 33 which pivots a two-armed compensating lever by means of a bolt 34 (see FIG. 6).
  • the two ends of the compensating lever 35 are connected by ball joints 36 and 37 to two-armed vertical levers 38, 39 which are also hinged at their pivot point 40 to the vertical part of the collecting dish 14.
  • FIGS. 1, 2 and 3 show the levers 38, 39 disposed one behind the others.
  • Links 41 are hinged at the lower free end of both levers 38 and 39, the other end of the links being pivotably joined to grippers 42.
  • the gripper-s42 comprise pairs of grips each with two jaws or rocker levers 42a and 42b each of which is supported so as to pivot about bolts 43 and 44, respectively on the horizontal part of the collecting dish 14.
  • the rocker levers 42a and 42b have toothed segments 45 by means of which they are cou pled so that the force transmitted to the rocker levers 42a by the links 41 is transmitted via the toothed seg ments 45 to the other rocker levers 42b and both rocker levers 42a, 42b have common movement althe extrusion discard if such surfaces are not parallel.
  • a hydraulic cylinder 51 (see FIG. 2) whose piston rod is coupled by means of a link bolt to the lever 8, provides axial displacement of the pivoting frame 5 on the shaft 6.
  • FIG. 8 shows a round extrusion discard cropped off by the shears 3 and comprising an extrusion disc 55 and. a billet discard 56, slightly ovally deformed by the cropping operation; the extrusion discard is located in the collecting dish 14 and is gripped by pairs of grips 42 and 42 which are disposed one behind the other.
  • the twoarmed vertical lever 19 is replaced by a single lever whose upper end is hinged to the bolt 11 which is fixed in the pivoting frame 5 and whose lower end is coupled by means of bolts 23 to the radius rod 22, the hydraulic piston-cylinder unit 21 bieng pivoted to the pivoting frame so as to act on the bolt 23.
  • the pivoting frame 5, ready for inward pivoting. is disposed outside the press.
  • the upper cylinder chamber of the piston-cylinder unit 17 is pressurised so that the lever 12 is retained at a slight angle, being upwardly inclined to the left.
  • the piston-cylinder unit 21 has its right-hand cylinder chamber pressurised so that the piston rod moves the lever 19 anti-clockwise..This causes the radius rod 22 to pull the lower joint 24 of the collecting dish 14 to the right. Accordingly. the collecting dish 14 tilts downwardly while pivoting anti-clockwise about the upper joint 13.
  • the right-hand cylinder chamber of the pistoncylinder unit 30 is pressurised so that the pairs of grips 42 open.
  • the piston rod 32 thrusts the upper free end of the two-armed levers 38, 39 to the left so that the lower ends of the levers 38, 39 pull the rocker levers 42a and 42a to the right.
  • the left-hand rocker levers 42b and 4219' move to the left due to the, coupling which is provided by the toothed segments 45.
  • the hydraulic cylinder 9 is then pressurised so that the pivoting frame 5 pivots to the left about its pivot shaft 6 until its stop abutment l0 abuts the press frame 1 (FIG.3).
  • the collecting dish 14 in its downward tilted state is pivoted into the press, passing between the upper right-hand column 2 of the press and the upper edge of a press frame 1 and between the container 57 and a press die 58 (see FIG. 2).
  • Pressurising the other chamber of the piston-cylinder unit 21 causes the collecting dish 14 to be pivoted clockwise into a horizontal position directly under the extrusion discard which comprises the billet discard 56 and the extrusion disc 55.
  • the left-hand gripping heads 46 will pivot past the outer left-hand edge of the billet discard into the position indicated in FIG. 1. During this operation the collectingdish 29 comes into contact with the lower edge of the extrusion discard.
  • the billet discard 56 is cropped off by means of the shears 3 from the extruded strand (not shown) after the extrusion ram (not shown) and the billet container 57 are retracted.
  • the cropping operation sometimes deforms the billet discard 56 to such an extent that its original circular shape becomes oval (see FIG. 8).
  • the compensating lever 35 enables the pairs of grips 42 and 42 to adapt themselves automatically to the different widths of the billet discard 56 and the extrusion disc 55.
  • the gripping heads 46 also adjust themselves to an inclined position if the billet discard merges with a taper into the extrusion disc.
  • the two cylinder chambers of the piston-cylinder unit 17 are connected through the adjustable restrictor 28 by means of the valve so that the collecting dish 14 with the billet discard 56 and the extrusion disc 55 is thrust parallel to the downward direction against a corresponding resistance by the restrictor 28 during the cropping operation.
  • the parallel downward motion of the collecting dish 14 is accompanied by a slight lateral deflection relative to the vertical and corresponding to the circular arc of the upper joint 13 of the lever 12 about the bolt 11. This deflection is of no significance for circular sections and more particularly for flat sections because the clamped extrusion discard is able to slide horizontally while being cropped by the shearknife 3.
  • the piston-cylinder unit 17 is pressurised by the valve 59 so that the lever 12 moves clockwise and the collecting dish is once again raised in parallel.
  • the collecting dish 14 is tilted down by pressurising the righ-hand chamber of the piston-cylinder unit 21. This enables the billet discard and the gripping heads 46 to pass by the upper right-hand column 2 when the pivoting frame 5 is pivoted out of the press.
  • the pivoting frame 5 may be displaced parallel to the extrusion axis by means of the hydraulic cylinder 51, depending on the extrusion programme and depending on the method by which the billet is cut.
  • a discard removing device for a horizontal extrusion press having a press frame comprising:
  • mounting means pivotally movable about a pivot axis parallel to the extrusion axis and in a plane generally perpendicular to said extrusion axis, said mounting means having an upper free end portion;
  • gripping means for gripping the extrusion discard, for pivoting out of and into said extrusion axis between said extrusion discard and said press frame;
  • a discard removing device for a horizontal extrusion press having a press frame comprising:
  • mounting means pivotally movable about a pivot axis parallel to the extrusion axis and in a plane generally perpendicular to said extrusion axis, .said' mounting means having an upper free end portion;
  • gripping means for gripping the extrusion discard for pivoting out of and into said extrusion axis between said extrusion discard and said press frame;
  • said combined parallel link and tilting means comprising an upper, generally horizontal lever pivoted to said mounting means, said lever-having a free front end portion pivoted to said gripping means, a generally vertical lever pivoted to said mounting means on the same pivot axis as that between said generally horizontal lever and said mounting means, and a second generally horizontal lever having a first end portion and a second end portion pivoted to said gripping means, said generally vertical lever having a free lower end portion movably connected to said first end portion of said second generally horizontal lever.
  • a discard removing device for a horizontal extrusion press having a press frame comprising:
  • mounting means pivotally movable about a pivot axis parallel to the extrusion axis and in a plane generally perpendicular to said extrusion axis, said mounting means having an upper free end portion;
  • gripping means for gripping the extrusion discard for pivoting out of and into said extrusion axis between said extrusion discard and said press frame;
  • said pressure fluid actuatable means for moving said gripping means up and down and tilting said gripping means comprising a double-acting pressure fluid piston-cylinder unit for moving said gripping means up and down, said double-acting pressure fluid pistoncylinder unit comprising two cylinder chambers of identical effective cross-sectional area, closable fluid interconnection means interconnecting said chambers and a restrictor in said interconnecting means.
  • a discard removing device for a horizontal extru sion press having a press frame comprising:
  • mounting means pivotally movable about a pivot axis parallel to the extrusion axis and in a plane generally perpendicular to said extrusion axis, said mounting means having an upper free end portion;
  • gripping means for gripping the extrusion discard for pivoting out of and into said extrusion axis between said extrusion discard and said press frame;
  • said gripping means comprising a collecting dish and gripping jaws pivoted to said collecting dish.
  • a discard removing device for a horizontal extrusion press having a press frame comprising;
  • mounting means pivotally movable about a pivot axis parallel to the extrusion axis and in a plane generally perpendicular to said extrusion axis, said mounting means having an upper free end portion;
  • gripping means for gripping the extrusion discard for pivoting out of and into said extrusion axis between said extrusion discard and said press frame;
  • said gripping means comprising two spaced pairs of gripping jaws disposed one behind the other. and wherein said pressure fluid actuatable means for actuating said gripping means comprises a single actuating unit and a lever compensating system connected to each pair of gripping jaws, whereby the gripping action of each pair of jaws can be either the same or different.
  • said lever compensating system comprises a two-armed compensating lever having a center portion and two end portions, said single actuating unit being connected to said center portion. and force transmitting means connecting said two end portions to said pairs of gripping jaws, said force transmitting means comprising ball joints.
  • said gripping means comprises a carrying member and wherein each said pair of said gripping jaws comprises two rocker.
  • levers pivoted to said carrying member' said rocker levers having respective toothed lower generally horizontal free ends which mesh with each other and upper generally vertical free ends.
  • gripping heads being mounted on said upper free ends of said rocker levers.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Of Metal (AREA)
  • Press Drives And Press Lines (AREA)
US00328277A 1972-01-31 1973-01-31 Discard removing device for an extrusion press Expired - Lifetime US3838589A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2204329A DE2204329A1 (de) 1972-01-31 1972-01-31 Pressrestausbringvorrichtung an horizontalen metallstrang- und rohrpressen, insbesondere fuer flachprofile aus aluminium

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US3838589A true US3838589A (en) 1974-10-01

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US00328277A Expired - Lifetime US3838589A (en) 1972-01-31 1973-01-31 Discard removing device for an extrusion press

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US (1) US3838589A (it)
JP (1) JPS4888052A (it)
DE (1) DE2204329A1 (it)
FR (1) FR2170033B1 (it)
GB (1) GB1394759A (it)
IT (1) IT978571B (it)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090320549A1 (en) * 2006-07-20 2009-12-31 Ube Machinery Corporation, Ltd. a corporation of Japan Discard conveying apparatus
US20230065058A1 (en) * 2021-08-26 2023-03-02 Brilex Technical Solutions, LLC Butt retrieval system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01109312U (it) * 1988-01-18 1989-07-24

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3129818A (en) * 1960-02-26 1964-04-21 Schloemann Ag Means for severing from an extruded product a pack expelled by a press ram from the container of a metal extrusion press
US3431765A (en) * 1964-10-14 1969-03-11 Lombard Corp Hydraulic extrusion press
US3462991A (en) * 1966-01-19 1969-08-26 Kobe Steel Ltd Combined extrusion residue receiver and billet guide for metal extrusion press

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5038516U (it) * 1973-08-07 1975-04-21

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3129818A (en) * 1960-02-26 1964-04-21 Schloemann Ag Means for severing from an extruded product a pack expelled by a press ram from the container of a metal extrusion press
US3431765A (en) * 1964-10-14 1969-03-11 Lombard Corp Hydraulic extrusion press
US3462991A (en) * 1966-01-19 1969-08-26 Kobe Steel Ltd Combined extrusion residue receiver and billet guide for metal extrusion press

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090320549A1 (en) * 2006-07-20 2009-12-31 Ube Machinery Corporation, Ltd. a corporation of Japan Discard conveying apparatus
US8122752B2 (en) * 2006-07-20 2012-02-28 Ube Machinery Corporation, Ltd. Discard conveying apparatus
US20230065058A1 (en) * 2021-08-26 2023-03-02 Brilex Technical Solutions, LLC Butt retrieval system
US11883869B2 (en) * 2021-08-26 2024-01-30 Brilex Technical Solutions, LLC Butt retrieval system

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DE2204329A1 (de) 1973-08-09
IT978571B (it) 1974-09-20
FR2170033A1 (it) 1973-09-14
JPS4888052A (it) 1973-11-19
FR2170033B1 (it) 1976-05-14
GB1394759A (en) 1975-05-21

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