US3750497A - Adjusting mechanism for radially movable tools in rotary tubular tool holders of shaving machines for wire or the like - Google Patents

Adjusting mechanism for radially movable tools in rotary tubular tool holders of shaving machines for wire or the like Download PDF

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Publication number
US3750497A
US3750497A US00199628A US3750497DA US3750497A US 3750497 A US3750497 A US 3750497A US 00199628 A US00199628 A US 00199628A US 3750497D A US3750497D A US 3750497DA US 3750497 A US3750497 A US 3750497A
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US
United States
Prior art keywords
outer race
holder
combination
frame
shaving head
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US00199628A
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English (en)
Inventor
A Goeke
F Riedel
K Weck
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.)
TH Kieserling and Albrecht GmbH and Co
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TH Kieserling and Albrecht GmbH and Co
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Filing date
Publication date
Priority claimed from DE19702060760 external-priority patent/DE2060760C/de
Application filed by TH Kieserling and Albrecht GmbH and Co filed Critical TH Kieserling and Albrecht GmbH and Co
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Anticipated expiration legal-status Critical
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B5/00—Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor
    • B23B5/08—Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor for turning axles, bars, rods, tubes, rolls, i.e. shaft-turning lathes, roll lathes; Centreless turning
    • B23B5/12—Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor for turning axles, bars, rods, tubes, rolls, i.e. shaft-turning lathes, roll lathes; Centreless turning for peeling bars or tubes by making use of cutting bits arranged around the workpiece
    • Y—GENERAL 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T82/00—Turning
    • Y10T82/25—Lathe
    • Y10T82/2527—Lathe having hollow cutter head

Definitions

  • the outer race of the bearing is provided with annuli of equidistant plenum chambers which are sealed by a stationary ring-shaped guide surrounding the bearing and having conduits for admission of pressurized fluid into the plenum chambers.
  • the plenum chambers serve as a stabilizing or cushioning means for holding the bearing against radial movements with reference to the frame.
  • the adjusting sleeve is loosely coupled to the shaving head so that it rotates with but need not share vibratory or other stray movements of the shaving head. This insures that such stray movements need not be shared by the tools whose supports are biased against a conical internal surface of the adjusting sleeve.
  • the present invention relates to machines for shaving or analogous treatment of elongated metallic workpieces, such as tubes, rods, rolled wire or the like. More particularly, the invention relates to improvements in an adjusting mechanism which can be employed to effect radial movements of one or more tools, rolls, rollers, tool supports and/or analogous adjustable elements in the rotary tubular tool holder or head of a shaving or analogous material removing machine.
  • the invention relates to improvements in adjusting mechanisms of the type wherein one or more tools or other adjustable elements are caused to move radially of a rotary tubular holder in response to axial displacements of a preferably sleeve-like adjusting member which is mounted on and rotates with the tubular holder.
  • a preferably sleeve-like adjusting member which is mounted on and rotates with the tubular holder.
  • such adjusting member is pro-' vided with a conical internal surface which is in permanent abutment with conical surfaces of the radially adjustable elements so that such elements are caused or allowed to move radially of the tubular holder in response to axial displacements of the adjusting member.
  • the tool holder or shaving head When a shaving machine is used to remove material from the external surface of rolled wire or wire rods having a smaller diameter, the tool holder or shaving head must normally be driven at a very high speed.
  • the quality of surface finish on such small-diameter workpieces depends to a great extent on the stability of the material removing tools. Thus, chatter marks or other types of unevennesses will appear if the shaving head is allowed to vibrate at elevated speeds and if such vibratory movements are transmitted to the tools which rotate with the shaving head.
  • German Pat. No. 1,188,413 discloses a shaving machine wherein the adjusting sleeve which serves to effect radial adjustments of tools in the rotary shaving head is operativcly connected with the inner race of one main antifriction bearing for the shaving head.
  • the outer race of such main bearing is movable with reference to the axis of the shaving head to thereby effect axial adjustments of the sleeve which latter, in turn, effects radial adjustments of the tools.
  • the inner race of movable main bearing is keyed to the shaving head so that such parts rotate as a unit but the inner race is free to move axially of the shaving head in response to each axial displacement of the outer race with reference to the frame of the shaving machine.
  • the outer race is connected with a ring which is keyed to the frame so that it is free to move axially with the outer race but is held against angular movement.
  • the means for moving the outer race axially of the shaving head is coupled to the aforementioned ring.
  • the just described shaving machine exhibits a serious drawback, namely, that the stability of the shaving head varis in response to changes in axial position of the movable main bearing.
  • the stability of the shaving head varis in response to changes in axial position of the movable main bearing.
  • the axially movable main bearing is normally the one which is nearest to the shaving station so that, when such bearing is caused to move away from the shaving station, the likelihood of vibration of the shaving head and shaving tools increases with the result that the cutting edges of the tools will leave chatter marks on the peripheral surface of the workpiece.
  • the aforementioned ring which is coupled to and effects axial movements of the outer race of the movable main bearing is a simple sliding fit in the frame of the shaving machine. It was found that such mounting of the ring in the frame is unsatisfactory because it does not prevent undue vibrations of the movable bearing and of the shaving head when the shaving head is driven at a high speed, and especially when the movable bearing is caused to move in a direction away from the shaving station.
  • German Utility Model No. 1,951,782 discloses a shaving machine wherein the adjusting sleeve for radially movable shaving tools is installed directly on the shaving head.
  • the adjusting sleeve is mounted on roller bearings which are constructed in such a way that the likelihood of transmitting detrimental forces to the bearings during vibration of the shaving head is reduced.
  • the front mainantifriction bearing for the shaving head is fixedly mounted in the frame of the shaving machine.
  • the adjusting sleeve is movable axially by means of a worm which rotates a worm wheel having an internal thread in mesh with the outer race of the roller bearing which is movable axially to thus shift the adjusting sleeve.
  • Such shaving machines are also incapable of preventing, with a requisite degree of certainty, all undesirable radial displacements or other stray movements of the shaving head with the result that the shaving tools are likely to produce chatter marks.
  • An object of the invention is to provide a shaving or like machine for treatment of elongated rod-like or tubular workpieces, such as rolled wire, with a novel and improved adjusting mechanism for one or more tools, rolls, rollers or analogous adjustable elements which are movable radially of a rotary tubular holder in response to axial movements of an adjusting member, and to construct and assemble the adjusting mechanism in such a way that eventual vibrations or other stray movements of the tubular holder, especially when the holder rotates at a high speed, are unlikely to or cannot be transmitted to the radially movable elements.
  • Another object of the invention is to provide a novel and improved mounting for the adjusting sleeve which serves to effect radial movements of one or more tools or analogous adjustable elements in a rotary tubular holder, the improved mounting being capable of preventing the transmission of stray movements from the tubular holder to the adjusting sleeve.
  • the invention is embodied in a machine tool, particularly in a machine for shaving or analogous treatment of rolled wire or similar elongated metallic workpieces.
  • the machine comprises a stationary frame, a tubular holder (such as the shaving head of a shaving machine) which is rotatably mounted in the frame and might exhibit the tendency to vibrate, especially when driven at a high speed, at least one antifriction bearing surrounding the holder and having inner and outer races which are movable as a unit axially of the holder but are rotatable relative to each other, stabilizing means disposed between the outer race and the frame (such stabilizing means preferably comprises one or more annuli of plenum chambers provided in the periphery of the outer race and being connected with a pump or another suitable source of pressurized fluid by way ofconduit means provided in a stationary guide member which surrounds the outer race with minimal clearance), for
  • FIG. I is a fragmentary central longitudinal vertical sectional view of a shaving machine with a tubular holder for tools which are adjustable by a mechanism embodying the present invention, the section being DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring first to FIGS. I and 2, there is shown a portion of a machine which can be utllized, for example,
  • the machine comprises a frame I provided with main antifriction bearings 3a, 3b and 4 for a rotary tubular tool holder or shaving head 2.
  • An intermediate portion of the head 2 constitutes or is connected with a pulley 40 which is driven by an endless flat belt 33 so that the shaving head rotates about the axis of the elongated workpiece 5.
  • a feeding unit which is mounted upstream of the shaving station (at the left-hand end of the shaving head 2, as viewed in FIG. 1) comprises driven advancing or feeding rollers 7 which are adjustable simultaneously radially toward and away from the path for the workpiece 5.
  • the construction of the mechanism which serves to effect appropriate adjustments of the advancing rollers 7 forms no part of the present invention.
  • the shaving head 2 supports two axially spaced sets of guide rolls 8 which are installed downstream of the shaving station and are adjustable (individually and/or simultaneously) radially of the path for the workpiece 5.
  • each set of guide rolls 8 may comprise three equidistant rolls.
  • the construction of the mechanism which serves to effect radial adjustments of the guide rolls 8 forms no part of the present invention; as shown in FIG. I, each guide roll 8 can be mounted in the shaving head 2 on a lever which can be pivoted by a motion transmitting rod 8b and link 8c.
  • the shaving station accommodates at least one but preferably several material removing tools or knives 6 which are movable radially of the shaving head 2 and each of which is mounted in the shaving head by means of a support 9 having a conical external surface 9a.
  • the conical surfaces 9a of all supports 9 are permanently biased against a conical internal surface 10a provided in a sleeve-like adjusting member 10 which surrounds the adjacent portion 2a of the shaving head 2 and is secured thereto by one or more torque transmitting keys 18 or the like so that it is compelled to share the angular movements of but is movable axially with reference to the shaving head.
  • the shaving head 2 has a certain freedom of radial movement with reference to the adjusting sleeve 10.
  • the tools 6 rotate with the shaving head 2 and are movable radially toward or away from the path for the workpiece 5, depending upon whether the adjusting sleeve 10 is caused to move axially in a direction to the left or to the right, as viewed in FIG. I.
  • the means for biasing the surfaces of the supports 9 against the conical internal surface 10a of the sleeve 10 is not shown in the drawing.
  • the aforementioned clearance between the peripheral surface of the shaving head portion 2a and the internal surface of the adjusting sleeve 10 is so large that eventual vibrations or other stray movements of the shaving head are unlikely to be trans mitted to the sleeve 10 and tools 6.
  • the adjusting sleeve 10 is rotatable and movable axially with the inner races of two auxiliary antifriction bearings 11a, 11b which comprise a common outer race 12.
  • the outer race 12 is received with minimal clearance in a guide ring 13 which is fixedly secured to the frame 1.
  • the arrangement is such that all axial movements of the outer race 12 are transmitted to the inner races of the auxiliary bearings 11a, 11b and such inner races move the adjusting sleeve 10 axially of the shaving head 2 to thereby change the radial positions of tools 6, i.e., the distance between the cutting edges of tools 6 and the axis of the shaving head.
  • the guide ring 13 is surrounded by a portion of a worm wheel 14 which is rotatable in the frame I and can be rotated by a worm 34 driven by the output member of a reversible gear motor 35 or an analogous prime mover through the intermediary of a suitable clutch 35a shown in FIG. 2.
  • the right-hand portion of the worm wheel 14 (as viewed in FIG. 1) is provided with internal threads 14a meshing with the external threads of a ring 15 which is secured to and can be said to form part of the outer race 12.
  • the ring 15 has an axially parallel projection or stud 16 which extends into a blind bore 17 of the frame 1 to hold the outer race 12 against rotation but to allow this outer race to move axially in response to rotation of the worm wheel 14.
  • the reversible motor 35 is preferably of the variable-speed type so that it can move the outer race 12 (and hence the entire auxiliary antifriction bearings 11a, llb and the adjusting sleeve 10) axially in a desired direction in order to effect necessary radial displacements of the tools 6.
  • the peripheral surface of the outer race 12 is provided with an annulus of equidistant plenum chambers 19 which can be staggered with reference to each other in the axial direction of the shaving head 2 to effect a desirable axial stabilization of the outer race 12.
  • the arrangement is such that one-half of the total number of plenum chambers 19 form a first annulus located in a first plane and the remaining chambers 19 form a second annulus which is located in a second plane.
  • the two planes are normal to the axis of the outer race 12 and the chambers 19 of one of the two annuli alternate with the chambers of the other annulus, as considered in the circumferential direction of the outer race 12.
  • each of these chambers preferably constitutes a tapped bore provided in an internally threaded socket 21 which is recessed into the peripheral surface of the outer race 12 and receives an externally threaded disk 20.
  • the curvature of the exposed external surfaces of the disks 20 preferably complements the curvature of the internal surface of the fixed guide ring 13.
  • the outer end face of each socket 21 is adjacent to a sealing ring 22 which bears against the internal surface of the guide ring 13 tothus prevent excessive leakage of pressurized fluid from the respective chamber 19.
  • Such fluid is pressurized by a pump 24 (FIG. 3) which is driven by an electric motor 23 and draws hydraulic fluid from a tank 25.
  • the pressurized fluid is caused to flow through a supply conduit 28 containing a one-way ball check valve 26 and a pressure regulating valve 27 to thereupon flow into a distributor conduit 29.
  • the latter is in communication with the chambers 19 by means of conduits 31 containing oneway ball check valves 30. If necessary, the fluid in any one of the chambers 19 can be evacuated by way of a discrete discharge conduit 32 which is normally sealed.
  • the conduits 29, 31 and 32 are machined into the guide ring 13. Two of the check valves 30 and the corresponding conduits 31 are illustrated in greater detail in FIG. 1.
  • the conduit 28 is mounted in the frame 1 (see the upper portion of FIG. 1).
  • the plenum chambers 19 together constitute a stabilizing or cushioning means which insures that the outer race 12 (and hence the inner races of the auxiliary bearings 11a. llb and the adjusting sleeve 10) cannot move radially of the fixedly mounted guide ring 13 which can be said to form a component part of the frame 1.
  • An important advantage of the improved adjusting mechanism for the tools 6 is that the torquetransmitting connection between the portion 2a of the shaving head 2'and the adjusting sleeve 10 is such that eventual vibrations of the shaving head need not necessarily be transmitted to the adjusting sleeve.
  • the plenum chambers 19 insure that the adjusting sleeve 10 is held against stray movements with reference to the frame 1 with the result that, even if the shaving head 2 vibrates or performs other undesirable stray movements, the adjusting sleeve 10 is capable of rotating at the exact speed of the shaving head but without being compelled to share the stray movements of the latter. This reduces the likelihood that the cutting edges of the knives 6 would produce chatter marks, even if the machine is used for the shaving of small-diameter workpieces and even if the shaving head 2 is caused to rotate at a very high speed.
  • the pressurized fluid in the chambers 19 prevents any appreciable radial movements of the outer race 12 of the auxiliary bearings 11a, llb with reference to the path for the workpiece 5.
  • the inner races of the bearings 11a, 1 lb hold the adjusting sleeve 10 against radial movement with reference to the outer race 12. Consequently, the adjusting sleeve 10 is compelled to rotate about a fixed axis even if the axis of rotation of the shaving head 2 deviates from such fixed axis, i.e., even if the shaving head is caused to vibrate while it rotates about the workpiece 5.
  • Such mounting of the adjusting sleeve 10 insures that the distance between the cutting edges of the tools 6 and the path for the workpiece 5 changes only when the adjusting sleeve is caused to moveaxially in response to a clockwise or counterclockwise-rotation of the worm 34 under the action of the motor 35.
  • the aforementioned clearance or freedom with which the adjusting sleeve 10 is coupled for rotation with the shaving head 2 insures that the shaving head can perform stray movements but that such movements need not and normally are not transmitted to the adjusting sleeve and tools 6. Also, such clearance reduces the likelihood of excessive stressing of auxiliary bearings 11a, llb when the shaving head 2 vibrates.
  • the bearings 11a, 11b In the absence of a clearance, the bearings 11a, 11b would be subjected to substantial stresses because the chambers 19 prevent radial movements of the adjusting sleeve 10, i.e., the bearings 11a, 11b would have to take up all such stresses which would arise due to the fact that the adjusting sleeve 10 cannot participate in radial or other stray movements of the shaving head.
  • a combination comprising a frame; a tubular holder rotatably mounted in said frame; at least one antifriction bearing spacedly surrounding said holder and having inner and outer races movable as a unit axially of said holder, said inner race beingrotatable relative to said outer race; stabilizing means for holding said races against other but axial movement with reference to said frame; means for moving said outer race axially of said holder; an adjusting member connected with said inner race for angular and axial movement therewith; at least one adjustable element installed in said holder and arranged to move radially of said holder in response to axial movements of said adjusting member; and torque transmitting means connecting said adjusting member to said holder with at least some radial freedom of movement of said holder relative to said adjusting member so that stray movements of said
  • said stabilizing means comprises a plurality of circumferentially spaced plenum chambers interposed between said outer race and said frame.
  • a combination as defined in claim 2 further comprising a source of pressurized fluid, conduit means connecting said source with said chambers, and oneway valve means provided in said conduit means for each of said chambers to prevent return flow of pressurized fluid from said chambers toward said source.
  • said stabilizing means comprises at least one annulus of at least substantially equidistant plenum chambers provided in'the peripheral surface of said outer race.
  • said means for moving said outer race axially of said holder comprises a worm wheel rotatably mounted in said frame and coaxially surrounding said outer race, said worm wheel having internal threads, an externally threaded ring-shaped member meshing with said worm wheel and connected with said outer race, means for holding said externally threaded member against rotation with reference to said frame while permitting said externally threaded member to move axially in response to rotation of said worm wheel, and a driven worm meshing with said worm wheel and arranged to rotate the latter in either of two directions.
  • said frame comprises an annular guide member interposed between said worm wheel and said outer race, said guide member being received with minimal clearance in said wrom wheel and receiving with minimal clearance said outer race, said stabilizing means comprising a plurality of plenum chambers disposed between said outer race and said guide member, a source of pressurized fluid, and conduit means connecting said source with said plenum chambers by way of said guide memher.
  • said stabilizing means comprises at least two annuli of equidistant plenum chambers provided in the periphery of said outer race, the plenum chambers of one of said annuli being staggered with reference to the plenum chambers of the other annulus as considered in the axial and circumferential directions of said outer race.
  • said adjusting member is a sleeve which is coaxial with said races, which surround said holder with clearance, and is provided with a conical internal surface, said element having a conical surface which is complementary to and is in permanent abutment with the conical surface of said sleeve.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Turning (AREA)
  • Support Of The Bearing (AREA)
  • Winding, Rewinding, Material Storage Devices (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)
US00199628A 1970-12-10 1971-11-17 Adjusting mechanism for radially movable tools in rotary tubular tool holders of shaving machines for wire or the like Expired - Lifetime US3750497A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702060760 DE2060760C (de) 1970-12-10 Vorrichtung zum radialen Verstellen der Werkzeuge eines umlaufenden Werkzeug tragers

Publications (1)

Publication Number Publication Date
US3750497A true US3750497A (en) 1973-08-07

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US00199628A Expired - Lifetime US3750497A (en) 1970-12-10 1971-11-17 Adjusting mechanism for radially movable tools in rotary tubular tool holders of shaving machines for wire or the like

Country Status (6)

Country Link
US (1) US3750497A (ref)
JP (1) JPS5511441B1 (ref)
CA (1) CA958928A (ref)
ES (1) ES392884A1 (ref)
FR (1) FR2117036A5 (ref)
GB (1) GB1332054A (ref)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4005624A (en) * 1974-05-14 1977-02-01 Th. Kieserling & Albrecht Metal peeling machine with movable clamping carriage
US4408506A (en) * 1981-04-13 1983-10-11 H & H Industries, Inc. Machine for precisely feeding and turning an axially movable non-rotating workpiece
US5255581A (en) * 1990-06-16 1993-10-26 Th. Kieserling & Albrecht Gmbh & Co. Peeling machine
US5324112A (en) * 1991-07-31 1994-06-28 Fiat Auto S.P.A. Detector device for evaluating the thermal comfort conditions in an environment, for example, in the interior of a motor vehicle
CN112139517A (zh) * 2020-09-18 2020-12-29 黑龙江齐四机床有限公司 一种无心剥皮机组
CN113715478A (zh) * 2020-05-26 2021-11-30 博斯特比勒费尔德有限公司 用于在印刷机中支撑印刷滚筒或网纹辊的轴承组件及印刷机

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3402173A1 (de) * 1984-01-23 1985-07-25 Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V., 3400 Göttingen Abschaelwerkzeug fuer standardbolzen
CN107262740B (zh) * 2017-07-27 2023-04-07 中国重型机械研究院股份公司 一种轴装式大预紧辊式导卫装置及方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3099929A (en) * 1959-10-30 1963-08-06 Th Calow & Co Bar scalping machine
US3486403A (en) * 1966-10-05 1969-12-30 Kieserling & Albrecht Machine for shaving workpieces of circular cross section

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3099929A (en) * 1959-10-30 1963-08-06 Th Calow & Co Bar scalping machine
US3486403A (en) * 1966-10-05 1969-12-30 Kieserling & Albrecht Machine for shaving workpieces of circular cross section

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4005624A (en) * 1974-05-14 1977-02-01 Th. Kieserling & Albrecht Metal peeling machine with movable clamping carriage
US4408506A (en) * 1981-04-13 1983-10-11 H & H Industries, Inc. Machine for precisely feeding and turning an axially movable non-rotating workpiece
US5255581A (en) * 1990-06-16 1993-10-26 Th. Kieserling & Albrecht Gmbh & Co. Peeling machine
US5324112A (en) * 1991-07-31 1994-06-28 Fiat Auto S.P.A. Detector device for evaluating the thermal comfort conditions in an environment, for example, in the interior of a motor vehicle
CN113715478A (zh) * 2020-05-26 2021-11-30 博斯特比勒费尔德有限公司 用于在印刷机中支撑印刷滚筒或网纹辊的轴承组件及印刷机
EP3916250A1 (en) * 2020-05-26 2021-12-01 Bobst Bielefeld GmbH Bearing assembly for supporting a printing cylinder or an anilox roll in a printing machine and printing machine
US11413857B2 (en) 2020-05-26 2022-08-16 Bobst Bielefeld Gmbh Bearing assembly for supporting a printing cylinder or an anilox roll in a printing machine and printing machine
CN112139517A (zh) * 2020-09-18 2020-12-29 黑龙江齐四机床有限公司 一种无心剥皮机组
CN112139517B (zh) * 2020-09-18 2024-04-12 黑龙江齐四机床有限公司 一种无心剥皮机组

Also Published As

Publication number Publication date
CA958928A (en) 1974-12-10
DE2060760A1 (de) 1972-08-31
FR2117036A5 (ref) 1972-07-21
ES392884A1 (es) 1973-10-01
DE2060760B2 (de) 1973-01-18
GB1332054A (en) 1973-10-03
JPS5511441B1 (ref) 1980-03-25
SU374795A3 (ref) 1973-03-20

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