US3784117A - Rotor for use in impact crushers - Google Patents

Rotor for use in impact crushers Download PDF

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Publication number
US3784117A
US3784117A US00293373A US3784117DA US3784117A US 3784117 A US3784117 A US 3784117A US 00293373 A US00293373 A US 00293373A US 3784117D A US3784117D A US 3784117DA US 3784117 A US3784117 A US 3784117A
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US
United States
Prior art keywords
pressure
rotor
combination
impact
wedge members
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
US00293373A
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English (en)
Inventor
R Koenig
G Hemesath
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.)
Salzgitter Maschinenbau GmbH
Original Assignee
HAZEMAG HARTZERKLEINERUNG
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Publication of US3784117A publication Critical patent/US3784117A/en
Assigned to WISSING, KARL-WILHELM, TRUSTEE IN BANKRUPTCY reassignment WISSING, KARL-WILHELM, TRUSTEE IN BANKRUPTCY COURT APPOINTMENT (SEE DOCUMENT FOR DETAILS). Assignors: HAZEMAG DR. E. ANDREAS GMBH & CO. KG, BY: THE DISTRICT COURT OF GERMANY BANKRUPT
Assigned to SALZGITTER MASCHINENBAU GMBH reassignment SALZGITTER MASCHINENBAU GMBH ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: HAZEMAG DR. E. ANDREAS GMBH & CO., BY: KARL W. WISSING, RECEIVER IN BAKRUPTCY
Assigned to HAZEMAG DR. E. ANDREAS GMBH & CO. reassignment HAZEMAG DR. E. ANDREAS GMBH & CO. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). DECEMBER 18, 1972 AND MARCH 21, 1977 RESPECTIVELY, GERMANY Assignors: HAZEMAG DR. E. ANDREAS KG (CHANGED TO), HAZEMAG, HARTZERKLEINERUNGS-UND ZEMENT-MASCHINENBAU-GESELLSCHAFT MIT BESCHRANKTER HAFTUNG (CHANGED TO)
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/26—Details
    • B02C13/28—Shape or construction of beater elements
    • B02C13/2804—Shape or construction of beater elements the beater elements being rigidly connected to the rotor

Definitions

  • a rotor body is composed of a plurality of axially spaced parallel plates which are rigidly connected for rotation about a joint axis.
  • the outer periphery of the rotor body is provided with slots extending inwardly of the periphery and in parallelism with the axis, and impact bars are arranged in the respective slots.
  • each slot Between the bars and one sidewall of each slot is mounted a support bar which interengages with the impact bar, the latter extending to some extent outwardly beyond the periphery of the rotor body. Between the other sidewall of the slot and the impact bar is arranged a wedge member which is urged to wedging position by a plurality of pressure-fluid operated elements arranged in the slots and being connected via branch conduits with main pressure fluid conduits arranged in the rotor body.
  • the present invention relates to a rotor, and in particular to a rotor for use in impact crushers,
  • Impact crushers are, speaking in general terms, devices wherein a rotor is mounted for rotation at high speed in a chamber.
  • the rotor is provided on its periphery with impact instrumentalities, usually impact bars, and the material to be crushed (e.g., rocks or the like) is admitted from above into the chamber so that it falls onto and is impacted by the impact bars of the rotor.
  • impact plates provided in the chamber, being spaced outwardly from the periphery of the rotor and material which is impacted by the impact bars of the rotor is flung by them against the impact plates, and repeated impacting of material by the bars and the plates causes the crushing of the material.
  • a rotor for use in impact crushers comprising in combination of rotor body means mounted for rotation about an axis and having an outer periphery.
  • a plurality of slots extend inwardly of the periphery and each slot has a longitudinal orientation and parallelism with the axis of rotation.
  • a plurality of impact bars are provided, each being accommodated in one of the slots and in part projecting outwardly beyond the periphery of the rotor body means.
  • a plurality of sets of wedge members are provided, with the wedge members of each set being received in a respective slot spaced along the associated impact bar and wedging the latter for maintaining it against displacement relative to the slot.
  • a plurality of said fluid-operated pressure elements are also provided, with the pressure elements of each set acting upon respective wedge members of an associated set of wedge members and urging them to wedging position.
  • a plurality of pressure-fluid conduits are each associated with one of the sets of pressure elements for supplying pressure fluid thereto.
  • the wedge members which serve to minutely adjust and hold the position of the impact bars are operated by action of the fluid-operated pressure elements, and all of the fluid-pressure elements which are associated with the wedge members of one of the impact bars are connected to a common pressure fluid conduit.
  • the present invention is based on the discovery that, quite contrary to this apparently justified initial assumption, it is possible to provide a construction which is such that the pressure exerted upon the wedge members can be maintained, at least until the next adjastment in the positioning of the impact bars or replacement of the impact bars is required. Furthermore, it is possible to associate the pressure system with hydraulic pressure reservoirs which are capable of compensating for small amounts of pressure fluid that might be lost during operation.
  • wedge members used for the purposes herein discussed may be of the self-locking type or may be of the type which is not self locking. If they are of the self locking type then they will be retained in their wedging position once they have been pushed to this wedging position by the pressure elements. However, it is currently preferred to use wedging elements which are not of the self-locking type, simply because experience has shown that the wedging elements of the self-locking type will become so tightly wedged after only a few hours of operation of the rotor that they are very difficult to release when adjustments must be made. Inasmuch as the pressure elements act constantly upon the wedging elements when the device is in operation, it is possible and, as pointed out above, currently preferred to make the wedge elements of the non-self-locking type.
  • the particular impact bar which is to be adjusted or replaced is located at an upper side of the rotor, that is when the rotor has been turned so that the impact bar and its as sociated wedge members are so located, termination of the supply of pressure fluid to the pressure elements of the wedge members which are associated with this particular impact bar will allow these wedge members to move downwardly under the influence of gravity, freeing the impact bar for ready adjustment, or at least requiring no more than a light hammer blow to move downwardly out of their wedging position.
  • the pressure elements will be so installed that the direction in which they exert pressure bisects the wedging angle. This means that the pressure elements are protected against lateral forces and skewing of their pistons is thereby avoided.
  • the present invention makes it possible to release simuitaneously all of the wedge members associated with a given impact bar, or if the impact bar is for instance of two sections, to release the wedge members associated with both of the sections, or of only one of the sections as may be required. Conversely, pressure can again be exerted on all of the wedge members simultaneously.
  • the end portion of the pressure fluid conduit supply pressure fluid to all pressure elements associated with the wedge members of a given impact bar can extend outwardly to one of the axial end faces of the rotor where they can be provided with appropriate connectors, for instance connectors of the snapcoupling valve-type or the like, by means of which they can be connected with a source of pressure fluid
  • the arrangement of the couplings can be so chosen that they are particularly readily accessible for maintenance personnel. In this connection it will be appreciated that it is not absolutely necessary that the position in which maintenance is carried out on a given impact bar, requires for the impact bar to be located at the upper side of the stationary rotor.
  • Pressurizing of the pressure fluid conduits can be effected by means of a manually operated pump acting as a source of pressure fluid, or of course by a compressor, by a vessel containing pressure fluid under pressure or the like, and also the release of pressure from the conduits can be effected in a similar manner, with connection of the pump or the source of pressure fluid automatically opening a valve in the connector associated with the respective pressure fluid conduit.
  • the rotor pres sure fluid conduit which is connected by means of branch conduits with all of the pressure elements of the rotor.-.
  • the wedge members are not of the self-locking type, then such an arrangement would not be particularly advantageous because releasing of the pressure would simultaneously free all of the wedge members associated with all of the impact bars, not only those associated with an impact bar on which maintenance work is to be performed, and there is the danger that undesired displacement might take place of impact bars for which such displacement or other maintenance is not required.
  • Rotors of the type here under discussion are frequently made of two or more axially spaced parallel or substantially parallel rotor plates which are mounted on a common shaft and connected with one another so as to be rigid. If the rotor utilizing the present invention is of this type, then it is advantageous if the pressure elements are located within the respective cutouts, that is cutouts formed in the respective plates, so that they do not extend beyond the axial end faces of the respective plate and are thereby protected. Further protection for the pressure elements can be obtained by providing recesses in the respective plates, which recesses extend inwardly of the respective cutouts and which house the pressure elements so that only the pistons thereof are exposed for engagement with the wedge members.
  • the pressure fluid conduits must also be protected against damage. This can be carried out by providing the rotor, if it is of the rotor-plate type with branch conduit bores in the respective plates, and by connecting these bores with a common main conduit for each set of such bores associated with the respective set of wedge elements associated with the impact bar.
  • the main conduits may extend in parallelism with the axis of rotation of the rotor and may for instance belocated in a tubular connector which rigidly connects the plates of the rotor to one another.
  • the impact bars are retained against undesired displacement in their respective slots not only by the wedge members but also by support bars which are lodged between the respective impact bar and one side face bonding the respective slot.
  • the support bars are located on that side of the respective impact bars which is the trailing side as seen with respect to the direction of rotation of the rotor, with the wedge members and pressure elements being located at the opposite side.
  • the impact bars are thus reinforced at their trailing side and the surface of the impact bars which faces forwardly and which impacts the material to be crushed is particularly stable and can have a relatively large surface area extending over the entire length of the respective impact bar. This could not be achieved if the wedge members, particularly of the non-self-locking type, were to be located at the trailing side of the impact bars.
  • FIG. 1 is an end-elevational view of a rotor according to the present invention, partly sectioned on line II of FIG. 2; I
  • FIG. 2 is an axial section taken on line II-.-II of FIG.
  • FIG. 3 is an enlarged sectional view of one of the pressure elements in FIGS. 1 and 2.
  • the illustrated rotor is composed of four axially spaced parallel rotor plates 1 which are rigidly connected with one another by a tubular element 2 to which they may be welded or otherwise secured in nonillustrated manner, just as the rotor will normally be mounted on a non-illustrated shaft for rotation about the axis A (see FIG. 1).
  • the plates 1 are all provided on the outer periphery with circumferentially spaced slots or cutouts 4 extending inwardly of the outer periphery and in each set of four of such cutouts (one in each plate 1) there is lodged an impact bar 3 which may be of one piece or, as shown in FIG.
  • each set of the cutouts 4 there is lodged, at the side of the impact bar 3 which is the trailing side thereof, a support bar 5 which extends over the entire length of the rotor and is welded to the plates 1.
  • Each bar 5 has a longitudinally extending rib 6 which extends into an appropriately configurated groove provided on the associated impact bar 3.
  • each impact bar 3 Located at the opposite side of each impact bar 3 in the same cutout 0r slot 4 are the wedge members 7 which assure that this engagement of the rib 6 with the associated groove in the impact bar 3 is maintained.
  • the wedge members 7 are inserted between the sidewalls 8 of the respective cutouts 4 and the juxtaposed surfaces 9 of the associated impact bars 3, being inserted from the radially inner side as illustrated. It is advantageous that the wedge members 7 do not extend over the entire length of the rotor, but be provided in form of individual wedge members each having a length which advantageously is slightly greater than the axial thickness of the respective plate 1, thus slightly overhanging the plate at the opposite axial endfaces and, advantageously also at the outer periphery as suggested in FIG. 7. The purpose of this overhang is to protect the plates 1 in these regions which are subject to strong wear, to some extent.
  • each of the cutouts 4 accommodates a hydraulic adjuster or pressure element 10, having a piston 11 which engages the inner side of the respective wedge member 7 and exerts an outwardly directed force, thus forcing the wedge member 7 to wedging position.
  • Each of the pressure elements is associated with a branch conduit 12' which extends in direction approximately towards the axis A through the respective plate 1 (see FIG. 2) and all of these branch conduits 12 associated with a particular impact bar 3 are connected with a pressure conduit or main conduit 13 which extends in axial parallelism with the axis of rotation A and in the illustrated embodiment is located within the tubular connecting element 2 which protects it against damage.
  • the conduit portion 13 extends to the outer axial endface of one of the terminal plates 1 (in FIG. 2 the lefthand one) where it is provided with a coupling member 15 which is readily accessible to an operator and is provided with a one-way valve to prevent release of pressure when the system composed of the conduits 12 and 13 has been pressurized.
  • conduits 12 and 13 exteriorily of the plates 1 and the tubular connecting element 2, in which case protective plates or similar elements must be provided which surround them or which are at least located ahead of them as seen with respect to the direction of rotation a.
  • the conduit 13 can be extended straight over the entire length of the rotor to the point where the connector 15 is to be provided.
  • FIG. 3 finally, shows a detail of one of the pressure elements 10.
  • These pressure elements each have a cylinder l6 and a hollow piston 11 which can be extended outwardly from the cylinder 16 under the influence of fluid pressure.
  • the piston 11 is biased by a spring 17 which permanently tends to retract it into the cylinder 16 and does so when pressure in the hydraulic system 12, 13 is reduced or disappears.
  • the cylinder 16 is provided with external screw threads 18 which are in engagement with similar internal screw threads provided in a recess of a mounting member 19, with a sealing ring 20 being interposed between the elements 16 and 19.
  • the element 19 is welded to the respective rotor plate 1 and serves to protect the cylinder 16 against damage. If desired, the element 19 may be extended to the exposed endface of the cylinder 16, or may be provided with a collar which extends to that exposed endface, in order to provide additional protection for the cylinder 16.
  • a combination comprising rotor body means mounted for rotation about an axis and having an outer periphery; a plurality of slots extending inwardly of said periphery and having a longitudinal orientation in parallelism with said axis; a plurality of impact bars each accommodated in one of said slots and in part projecting outwardly beyond said periphery; a plurality of sets of wedge members, each set comprising a plurality of wedge members received in a respective slot spaced along the associated impact bar and wedgingly engaged the latter for main taining it against displacement relative to the slot; .a plurality of sets of fluid-operated pressure elements, the pressure elements of each set acting upon respective wedge members of an associated set of wedge members and urging them to wedging position; and a plurality of pressure-fluid conduits each associated with one of said sets of pressure elements for supplying pressure fluid thereto.
  • said rotor body means having opposite axial endfaces, and wherein said pressure-fluid conduits extend to one of said endfaces and are provided with couplings with automatic closing valves for connection to a source of pressure fluid.
  • said rotor body means comprising a plurality of axially spaced at least substantially parallel rotor plates, and connector means rigidly connecting said plates together, said slots each being composed of a plurality of cutouts provided in the respective plates and extending from one to the other axial endface of each plate; and wherein said extending within the respective plate to an associated pressure element.
  • said connector means comprising at least one tubular connecting member, and said main conduit portion being arranged within said connecting member.
  • said pressure elements each including a cylinder and a piston; and wherein said pressure elements are so mounted within holes of said plates that said cylinders are enclosed and only said pistons project from said holes.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Pulverization Processes (AREA)
US00293373A 1971-09-30 1972-09-29 Rotor for use in impact crushers Expired - Lifetime US3784117A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2148752A DE2148752C3 (de) 1971-09-30 1971-09-30 Einrichtung zum Festlegen von Schlagleisten in Prallmühlenrotoren

Publications (1)

Publication Number Publication Date
US3784117A true US3784117A (en) 1974-01-08

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US00293373A Expired - Lifetime US3784117A (en) 1971-09-30 1972-09-29 Rotor for use in impact crushers

Country Status (13)

Country Link
US (1) US3784117A (es)
JP (1) JPS533496B2 (es)
AT (1) AT322339B (es)
AU (1) AU466392B2 (es)
BE (1) BE786699A (es)
BR (1) BR7206790D0 (es)
CA (1) CA972336A (es)
CH (1) CH542657A (es)
DE (1) DE2148752C3 (es)
ES (1) ES405774A1 (es)
FR (1) FR2155335A5 (es)
GB (1) GB1396194A (es)
ZA (1) ZA725789B (es)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3979078A (en) * 1974-03-15 1976-09-07 Hazemag Dr. E. Andreas Kg Beater bar for rotors of impact mills
US4180213A (en) * 1978-04-12 1979-12-25 Matsuzaka Company Ltd. Rotor of a coarse-reduction impact crusher
US4373678A (en) * 1980-06-30 1983-02-15 Reitter Guenther W Rotary impact crusher having a continuous rotary circumference
US4679740A (en) * 1986-01-06 1987-07-14 Stedman Machine Co. Wedge-clamp assembly for an impact crusher
US4720052A (en) * 1985-06-15 1988-01-19 O&K Orenstein & Koppel Aktiengesellschaft Device for the fastening of hammers in rebound-mill rotors
US4925114A (en) * 1988-04-15 1990-05-15 Cedarapids, Inc. Impeller bar installation and repositioning means for impact crushers having "open" type rotors
US5005772A (en) * 1988-04-15 1991-04-09 Cedarapids, Inc. Impeller bar installation and repositioning means for impact crushers having open type rotors
US5221054A (en) * 1990-03-01 1993-06-22 Salzgitter Maschinenbau Gmbh Rotor for use in impact crushers
US5320292A (en) * 1992-11-06 1994-06-14 Smith Roger G Mounting for replaceable hammers in impact crusher
US5395063A (en) * 1992-07-28 1995-03-07 Schroedl; Hermann Hammer bar for use in a rotor of a crusher
US5419499A (en) * 1991-02-15 1995-05-30 Bourne; Ronald F. Treatment of particulate material
US5474244A (en) * 1993-08-26 1995-12-12 Paul Bohringer Means for attaching an impact member to a coarse reduction impact crusher
US5497950A (en) * 1993-07-12 1996-03-12 Schroedl; Hermann Rotor for a disintegrating machine
US6874716B2 (en) * 2000-09-30 2005-04-05 Hazemag & Epr Gmbh Beater bar capable of being acted upon on one side for impactor rotors
EP2186984A1 (en) 2008-11-18 2010-05-19 Antoniolli Mario & C. Sas Drive member for a door or main door
WO2017013251A1 (de) * 2015-07-23 2017-01-26 Thyssenkrupp Industrial Solutions Ag Rotor für einen prallbrecher
CN110813984A (zh) * 2019-11-01 2020-02-21 淮安信息职业技术学院 一种自动化建筑垃圾回收装置

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2436338C3 (de) * 1974-07-27 1980-08-21 Hazemag Dr. E. Andreas Gmbh & Co, 4400 Muenster Rotor für Hammermühlen
DE2850299C2 (de) * 1978-11-20 1983-11-10 Hazemag Dr. E. Andreas GmbH & Co, 4400 Münster Einrichtung zum Festlegen von Schlagleisten in Längsschlitzen von Prallmühlenrotoren
FR2472416A2 (fr) * 1979-12-27 1981-07-03 Fives Cail Babcock Concasseur a percussion
DE4103301A1 (de) * 1990-03-01 1991-09-12 Salzgitter Maschinenbau Einrichtung zum festlegen von schlagleisten in randausschnitten von prallmuehlenrotoren
CN107715989B (zh) * 2017-12-01 2020-06-30 桐乡市易知简能信息技术有限公司 一种多级防损伤滚筒压磨装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB678428A (en) * 1950-03-14 1952-09-03 Westfalia Dinnendahl An improved rotor for impact mills
US2747803A (en) * 1952-07-09 1956-05-29 Pettibone Mulliken Corp Hammer rotor for hammermills
US3645459A (en) * 1969-02-28 1972-02-29 Fives Lille Cail Rotor for a roll crusher

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB678428A (en) * 1950-03-14 1952-09-03 Westfalia Dinnendahl An improved rotor for impact mills
US2747803A (en) * 1952-07-09 1956-05-29 Pettibone Mulliken Corp Hammer rotor for hammermills
US3645459A (en) * 1969-02-28 1972-02-29 Fives Lille Cail Rotor for a roll crusher

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3979078A (en) * 1974-03-15 1976-09-07 Hazemag Dr. E. Andreas Kg Beater bar for rotors of impact mills
US4180213A (en) * 1978-04-12 1979-12-25 Matsuzaka Company Ltd. Rotor of a coarse-reduction impact crusher
US4373678A (en) * 1980-06-30 1983-02-15 Reitter Guenther W Rotary impact crusher having a continuous rotary circumference
US4720052A (en) * 1985-06-15 1988-01-19 O&K Orenstein & Koppel Aktiengesellschaft Device for the fastening of hammers in rebound-mill rotors
US4679740A (en) * 1986-01-06 1987-07-14 Stedman Machine Co. Wedge-clamp assembly for an impact crusher
US4925114A (en) * 1988-04-15 1990-05-15 Cedarapids, Inc. Impeller bar installation and repositioning means for impact crushers having "open" type rotors
US5005772A (en) * 1988-04-15 1991-04-09 Cedarapids, Inc. Impeller bar installation and repositioning means for impact crushers having open type rotors
US5221054A (en) * 1990-03-01 1993-06-22 Salzgitter Maschinenbau Gmbh Rotor for use in impact crushers
US5419499A (en) * 1991-02-15 1995-05-30 Bourne; Ronald F. Treatment of particulate material
US5395063A (en) * 1992-07-28 1995-03-07 Schroedl; Hermann Hammer bar for use in a rotor of a crusher
US5320292A (en) * 1992-11-06 1994-06-14 Smith Roger G Mounting for replaceable hammers in impact crusher
US5497950A (en) * 1993-07-12 1996-03-12 Schroedl; Hermann Rotor for a disintegrating machine
US5474244A (en) * 1993-08-26 1995-12-12 Paul Bohringer Means for attaching an impact member to a coarse reduction impact crusher
US6874716B2 (en) * 2000-09-30 2005-04-05 Hazemag & Epr Gmbh Beater bar capable of being acted upon on one side for impactor rotors
EP2186984A1 (en) 2008-11-18 2010-05-19 Antoniolli Mario & C. Sas Drive member for a door or main door
WO2017013251A1 (de) * 2015-07-23 2017-01-26 Thyssenkrupp Industrial Solutions Ag Rotor für einen prallbrecher
CN107835716A (zh) * 2015-07-23 2018-03-23 蒂森克虏伯工业解决方案股份公司 用于冲击式破碎机的转子
CN110813984A (zh) * 2019-11-01 2020-02-21 淮安信息职业技术学院 一种自动化建筑垃圾回收装置
CN110813984B (zh) * 2019-11-01 2021-02-26 淮安信息职业技术学院 一种自动化建筑垃圾回收装置

Also Published As

Publication number Publication date
AT322339B (de) 1975-05-12
DE2148752A1 (de) 1973-04-05
DE2148752B2 (de) 1979-03-29
DE2148752C3 (de) 1979-11-22
BR7206790D0 (pt) 1973-08-21
FR2155335A5 (es) 1973-05-18
GB1396194A (en) 1975-06-04
CA972336A (en) 1975-08-05
ES405774A1 (es) 1975-09-16
AU466392B2 (en) 1975-10-30
JPS4841351A (es) 1973-06-16
AU4612172A (en) 1974-03-07
JPS533496B2 (es) 1978-02-07
CH542657A (de) 1973-10-15
BE786699A (fr) 1972-11-16
ZA725789B (en) 1973-06-27

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Legal Events

Date Code Title Description
AS Assignment

Owner name: HAZEMAG DR. E. ANDREAS GMBH & CO.

Free format text: CHANGE OF NAME;ASSIGNORS:HAZEMAG, HARTZERKLEINERUNGS-UND ZEMENT-MASCHINENBAU-GESELLSCHAFT MIT BESCHRANKTER HAFTUNG (CHANGED TO);HAZEMAG DR. E. ANDREAS KG (CHANGED TO);REEL/FRAME:005216/0044

Effective date: 19881208

Owner name: WISSING, KARL-WILHELM, TRUSTEE IN BANKRUPTCY

Free format text: COURT APPOINTMENT;ASSIGNOR:HAZEMAG DR. E. ANDREAS GMBH & CO. KG, BY: THE DISTRICT COURT OF GERMANY BANKRUPT;REEL/FRAME:005216/0054

Effective date: 19881115

Owner name: SALZGITTER MASCHINENBAU GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:HAZEMAG DR. E. ANDREAS GMBH & CO., BY: KARL W. WISSING, RECEIVER IN BAKRUPTCY;REEL/FRAME:005216/0056

Effective date: 19890510