US3213742A - Combination thread swaging and fastening screws - Google Patents

Combination thread swaging and fastening screws Download PDF

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Publication number
US3213742A
US3213742A US296003A US29600363A US3213742A US 3213742 A US3213742 A US 3213742A US 296003 A US296003 A US 296003A US 29600363 A US29600363 A US 29600363A US 3213742 A US3213742 A US 3213742A
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United States
Prior art keywords
end portion
turns
lobes
crest
pilot end
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
US296003A
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English (en)
Inventor
Simon S Kahn
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.)
General American Transportation Corp
Original Assignee
General American Transportation Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to GB1051769D priority Critical patent/GB1051769A/en
Application filed by General American Transportation Corp filed Critical General American Transportation Corp
Priority to US296003A priority patent/US3213742A/en
Priority to LU46139D priority patent/LU46139A1/xx
Priority to FR975666A priority patent/FR1395476A/fr
Priority to DE19641477053 priority patent/DE1477053A1/de
Priority to BE648546A priority patent/BE648546A/xx
Priority to NL6406010A priority patent/NL6406010A/xx
Application granted granted Critical
Publication of US3213742A publication Critical patent/US3213742A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
    • F16B25/0042—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw
    • F16B25/0057—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw the screw having distinct axial zones, e.g. multiple axial thread sections with different pitch or thread cross-sections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/001—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed
    • F16B25/0021—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed the material being metal, e.g. sheet-metal or aluminium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
    • F16B25/0042—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw
    • F16B25/0047—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw the ridge being characterised by its cross-section in the plane of the shaft axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
    • F16B25/0078—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw with a shaft of non-circular cross-section or other special geometric features of the shaft
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S411/00—Expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener
    • Y10S411/924—Coupled nut and bolt
    • Y10S411/929—Thread lock
    • Y10S411/938—Distorted thread

Definitions

  • the present invention relates to combination threadswaging and fastening screws, and more particularly to such screws adapted to swage threads of desired formation in generally cylindrical surfaces.
  • a general object of the invention is to provide a combination thread-swaging and fastening screw that comprises an elongated shank including a generally cylindrical rear body portion and a generally frusto-conical forwardly tapered front pilot end portion, a continuous thread carried on the shank and including both a plurality of helical turns on the rear body portion and a plurality of helical turns on the front pilot end portion, the thread having a fixed pitch, the turns on the rear body portion having substantially the same minor radius and successively forward ones of the turns on the front pilot end portion having gradually reduced minor radii, the turns on the rear body portion having a first crest projection from the root thereof and the turns on the front pilot end portion having a second crest projection from the root thereof, wherein the first crest projection is greater than the second crest projection, and a plurality of thread-swaging lobes carried by the turns on the front pilot end portion along the helix of the thread with a rotational angle A about the longitudinal axis of the shank between the centers of
  • Another object of the invention is to provide a screw of the character described, wherein each of the lobes has a variable crest projection from the root thereof that is maximized substantially at the center thereof and that at its maximum value is substantially greater than the second crest projection of the associated turn on the front pilot end portion, and wherein the maximum crest projection of the rearmost of the lobes is substantially equal to the first crest projection of the turns on the rear body portion.
  • Another object of the invention is to provide a screw of the character described, wherein each of the lobes has a variable flank width at the root thereof that is maximized substantially at the center thereof and that at its maximum value is substantially greater than the flank width of the associated turn on the front pilot end portion, and wherein the maximum flank width of the rearmost of the lobes is substantially equal to the flank width of the turns on the rear body portion.
  • a further object of the invention is to provide a screw of the character described, that includes an enlarged toolengaging head on the rear end of the shank thereof, whereby the screw swages a thread in a preformed opening provided in an associated workpiece, as the screw is set in the workpiece.
  • FIGURE 1 is a side view of a blank that is employed in making the fluteless thread-forming screw embodying the present invention
  • FIG. 2 is a side elevational view of the thread-swaging and fastening screw embodying the present invention
  • FIG. 3 is an enlarged diagrammatic illustration of the profile of the front portion of the thread provided on the front pilot end of the shank of the screw shown in FIG. 2;
  • FIG. 4 is an enlarged diagrammatic illustration of the plan of the front portion of the thread, as shown in FIG. 3;
  • FIG. 5 is a greatly enlarged fragmentary side elevational view of the front portion of the screw, as shown in FIG. 2, and illustrating in proper positions certain of the swaging lobes incorporated in the front portion of the thread and developed in FIGS. 3 and 4; and
  • FIG. 6 is an enlarged diagrammatic illustration of the proper angular positions of certain of the swaging lobes mentioned.
  • FIGS. 2 to 6, inclusive, of the drawings there is illustrated a fluteless thread-forming tool, in the form of a combination thread-swaging and fastening screw 10, and embodying the features of the present invention; which screw 10 comprises an elongated shank 11 including a forwardly tapered substantially frustoconical front pilot end portion 11a and a substantially cylindrical rear body portion 11b. Also, the screw 10 comprises an enlarged head 12 terminating the extreme rear end of the rear body portion 11b of the shank 11; which head 12 may be of any suitable type, a hexagon head 12 being illustrated for the purpose of the present description.
  • the head 12 is adapted to be received in a cooperating driving tool, such as a socket wrench, not shown, that is employed to set the screw 10 in an obvious manner.
  • the screw 10 comprises a continuous rolled thread 14 carried on the shank 11 and including a plurality of front helical turns 14a, 14b, 14c, 14d, 14e and 14 disposed on the front pilot end portion 11a and a plurality of rear helical turns 14w, 14x, 14y, etc., disposed on the rear body portion 11b.
  • turns 14a, 14b, 14c, 14d, 14c and 14 are sometimes referred to hereinafter, respectively, as the first, second, third, fourth, fifth and sixth turns on the front pilot end portion 11a.
  • the thread 14 has a fixed pitch; the turns 14w, 14x, 14y, etc., on the rear body portion 11b have substantially the same fixed minor radius; and successively forward ones of the turns 14 Me, 14d, etc., on the front pilot end portion 11a have gradually reduced minor radii.
  • the turns 14w, 14x, 14y, etc., on the rear body portion 11b have substantially the same fixed major radius, and consequently a corresponding first fixed crest projection from the root thereof; and successively forward ones of the turns 14 14c, 14d,'etc., on the front pilot end portion 11a have gradually reduced major radii and consequently a corresponding second fixed crest projection from the root thereof.
  • the first crest projection of the rear turns 14w, 14x, 14y, etc. is substantially greater than the second crest projection of the front turns 14 14c, 14d, etc.; all as clearly shown in FIGS. 2 and 5.
  • the radial distances between the two broken lines 1511 extending through the crests of the rear turns 14w, 14x, 14y, etc., and the respective root lines of the rear turns 14w, etc. are greater than the radial distances between the two broken lines 15a extending through the crests of the front turns 14a, 14b, 14c, etc., and the respective root lines of the front turns 14w, etc., as illustrated in FIG. 5.
  • Each rear turn 14w, etc. includes a crest and a pair of flanks disposed with an angle of approximately 60 therebetween and with a first flank width at the root thereof; and each front turn 14a, etc., includes a crest and a pair of flanks disposed with an angle of approximately 60 therebetween and with a second flank Width at the root thereof.
  • the flank width mentioned of each rear turn 14w, etc. is substantially greater than the flank width mentioned of each front turn 14a, etc.
  • the screw comprises a plurality of threadswaging lobes 16a provided on the front turn 14a, 16c provided on the front turn 14c, 16d provided on the front thread 14d, and 16a provided on the front thread 14e; all as shown in FIGS. 3 and 4.
  • each of the lobes subtends a rotational angle C about the longitudinal axis of the shank 11; wherein C is a given angle of approximately 120, as illustrated.
  • the lobe 160 is angularly displaced by 480, or by an apparent angle of 120, with respect to the lobe 16a; the lobe 16d is angularly displaced by 480, or by an apparent angle of 120, with respect to the lobe 16c; and the lobe 16e is angularly displaced by 480", or by an apparent angle of 120, with respect to the lobe 16d.
  • the lobes 16a, 16c, 16d, and 16s are of substantially identical construction and arrangement, except the sizes of the lobes 16a, etc., progressively increase rearwardly along the front pilot end portion 11a.
  • the lobe 16d provided on the front turn 14d comprise a crest 16d1 provided with leading and trailing edges 16d1L and 16d1T, and a pair of flanks 16d2 and 16d3 respectively provided with leading and trailing faces 16d2L, 16d2T and 16d3L, 16d3T.
  • leading and trailing edges 16d1L and 16d1T of the lobe crest 16d1 respectively merge into the adjacent portions of the associated front turn 14d; the leading and trailing faces 16d2L and 16d2T of the lobe flank 16d2 respectively merge into the adjacent portions of the corresponding flank of the associated front turn 14d; and the leading and trailing faces 16d3L and 16d3T of the lobe flank 16d3 respectively merge into the adjacent portions of the corresponding flank of the associated front turn 1411!.
  • the leading crest edge 16d1L rises gradually radially out of the crest of the associated front turn 14d; and the trailing crest edge 16d1T falls gradually radially back into the crest of the associated front turn 14d.
  • the lobe 16 has a variable crest projection from the root thereof that is maximized substantially at the center thereof and that at its maximum value is substantially greater than the second crest projection of the associated turn 14d.
  • the l ading flank face 16d2L rises gradually both radially and axially forwardly out of the corresponding flank of the associated front turn 14d, and the trailing flank face 16d2L falls gradually both radially and axially rearwardly back into the corresponding flank of the associated front turn 14d; and similarly, the leading flank face 16d3L rises gradually both radially and axially rearwardly out of the corresponding flank of the associated front turn 14d, and the trailing flank face 16d3T falls gradually both radially and axially forwardly back into the corresponding flank of the associated front turn 14d.
  • the lobe 16d has a variable flank width at the root thereof that is maximized substantially at the center thereof and that at its maximum value is substantially greater than the flank width of the associated front turn 14d.
  • FIG. 4 The progressively increasing sizes of the lobes 16a, 16c, 16d and 16a rearwardly along the front pilot end portion 11a is best illustrated in FIG. 4, wherein it will be observed that the lower broken line 15c passing through the bottoms of the crest of the lobes 16a and 16c is disposed below the adjacent lower broken line 15a. Also, the upper broken line 15d, corresponding to the lower broken line 150, is disposed above the corresponding upper broken line 15a passing through the tops of the front turns 14a, etc., so as further to indicate that the maximum crest projections of the lobes 16a, etc., are substantially greater than the crest projection of the front turns 14a, etc.
  • the maximum crest projection of the rearmost lobe 1642 is substantially equal to the crest projection of the rear turns 14w, 14x, etc.; and similarly, the maximum flank width 16e is substantially equal to the flank width of the rear turns 14w, 14x, etc.
  • this angle A 360+B, but B may be in the general range 60 to 120; whereby with a smaller angle B, the number of lobes on the turns carried on the front pilot end portion 11a is increased, assuming that there are six such turns thereon, as described above. Also, the provision of six such turns on the front pilot end portion 11a is not critical, and such number may be correspondingly increased by lengthening the front pilot end portion 11a, assuming a fixed pitch of the thread 14, as described above. Of course, a shorter pitch of the thread 14 will produce an increased number of turns on the front pilot end portion 11a, assuming a given length thereof.
  • the angle B may have any desired value in the approximate range 60 to 120.
  • the angle B has a value (30, 36, 40, 45 or 60) that is evenly divisible into 360, the lobes in the thread 14 are disposed in straight rows extending longitudinally along the front shank portion 11a; and when the angle B has a value that is not evenly divisible into 360, the lobes in the thread 14 are disposed in skewed rows extending longitudinally along the front shank portion 11a.
  • the illustrated example of 120 is not critical, although this angle C should be substantial; whereby C may be in the general range 60 to 120.
  • the blank B10 is forged or formed of metal and comprises an elongated shank B11 including a substantially frusto-conical front pilot end portion Ella and a substantially cylindrical rear body portion 1311b. Also, the blank B10 comprises the hexagon head B12 terminating the rear end of the rear body portion B111). Also, there are provided a pair of rolling dies, not shown, of flat plate-like construction.
  • the shank 11B of the blank B10 is subjected to rolling pressure between the complementary and mating dies, whereby the flutes and lands disposed in the rolling dies mentioned produce the continuous thread 14 in the shank 11 of the screw 10; all in a well-known manner.
  • the metal blank B10 is formed of low carbon steel; and after the screw 10 is formed therefrom in the present rolling method, the same is subjected to heat treatment so as to case harden it, in a Well-known manner.
  • the front helical turns 14w, etc. be quite hard, since the screw 10 is frequently employed in forming an internal thread in a cylindrical hole provided in a workpiece, when such workpiece is formed of steel, or other hard material.
  • a fluteless thread-forming tool and specifically a fastening screw of improved construction and arrangement.
  • This tool is very advantageous, since the same is operative to form the internal thread in the generally cylindrical surface of a pilot hole formed in a workpiece altogether by a swaging action, and without the formation of chips or cuttings from the workpiece.
  • the improved tool is substantially easier to operate in its thread-forming action than is a comparable conventional tool of the chip-forming type, in the sense that the improved tool requires substantially less driving torque than does the conventional tool mentioned.
  • a combination thread-swaging and fastening screw comprising an elongated shank including a generally cylindrical rear body portion and a generally frusto-conical forwardly tapered front pilot end portion, a continuous thread carried on said shank and including both a plurality of helical turns on said rear body portion and a plurality of helical turns on said front pilot end portion, said thread having a fixed pitch, the turns on said rear body portion having substantially the same minor radius and successively forward ones of the turns on said front pilot end portion having gradually reduced minor radii, the

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Forging (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
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US296003A 1963-07-18 1963-07-18 Combination thread swaging and fastening screws Expired - Lifetime US3213742A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
GB1051769D GB1051769A (es) 1963-07-18
US296003A US3213742A (en) 1963-07-18 1963-07-18 Combination thread swaging and fastening screws
LU46139D LU46139A1 (es) 1963-07-18 1964-05-23
FR975666A FR1395476A (fr) 1963-07-18 1964-05-25 Taraud sans cannelure
DE19641477053 DE1477053A1 (de) 1963-07-18 1964-05-26 Spannutenloses Werkzeug zum Herstellen von Gewinden
BE648546A BE648546A (es) 1963-07-18 1964-05-28
NL6406010A NL6406010A (es) 1963-07-18 1964-05-28

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US296003A US3213742A (en) 1963-07-18 1963-07-18 Combination thread swaging and fastening screws

Publications (1)

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US3213742A true US3213742A (en) 1965-10-26

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US296003A Expired - Lifetime US3213742A (en) 1963-07-18 1963-07-18 Combination thread swaging and fastening screws

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US (1) US3213742A (es)
BE (1) BE648546A (es)
DE (1) DE1477053A1 (es)
FR (1) FR1395476A (es)
GB (1) GB1051769A (es)
LU (1) LU46139A1 (es)
NL (1) NL6406010A (es)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3434168A (en) * 1967-09-26 1969-03-25 Maynard Mfg Co Method of making a lobular threaded fastener
US3481380A (en) * 1967-05-18 1969-12-02 Lamson & Sessions Co Thread forming fastener
US4112812A (en) * 1971-03-25 1978-09-12 Research Engineering & Manufacturing, Inc. Heat-treated article
US20060039775A1 (en) * 2002-10-02 2006-02-23 Hiromichi Mizuno Tapping screw
US7334975B2 (en) 2001-08-20 2008-02-26 Maclean-Fogg Company Fastener assembly
US20080219800A1 (en) * 2007-03-06 2008-09-11 Van Cor Dale E Threaded fastener and fastener system
US7438512B2 (en) 2001-08-20 2008-10-21 Maclean-Fogg Company U-bolt assembly
US20090053008A1 (en) * 2005-05-31 2009-02-26 Topura Co., Ltd. Tapping screw
US8011866B2 (en) 2001-08-20 2011-09-06 Maclean-Fogg Company Locking fastener assembly

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US66766A (en) * 1867-07-16 hoard
US2167559A (en) * 1937-06-24 1939-07-25 Lamson & Sessions Co Self-tapping screw
US2352982A (en) * 1942-06-25 1944-07-04 American Screw Co Screw for plastics
FR1265999A (fr) * 1959-06-09 1961-07-07 Res Engineering And Mfg Vis auto-taraudantes
US2991491A (en) * 1958-11-21 1961-07-11 Besly Welles Corp Fluteless swaging tap with sizing area increasing at a constant rate

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US66766A (en) * 1867-07-16 hoard
US2167559A (en) * 1937-06-24 1939-07-25 Lamson & Sessions Co Self-tapping screw
US2352982A (en) * 1942-06-25 1944-07-04 American Screw Co Screw for plastics
US2991491A (en) * 1958-11-21 1961-07-11 Besly Welles Corp Fluteless swaging tap with sizing area increasing at a constant rate
FR1265999A (fr) * 1959-06-09 1961-07-07 Res Engineering And Mfg Vis auto-taraudantes

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3481380A (en) * 1967-05-18 1969-12-02 Lamson & Sessions Co Thread forming fastener
US3434168A (en) * 1967-09-26 1969-03-25 Maynard Mfg Co Method of making a lobular threaded fastener
US4112812A (en) * 1971-03-25 1978-09-12 Research Engineering & Manufacturing, Inc. Heat-treated article
US7334975B2 (en) 2001-08-20 2008-02-26 Maclean-Fogg Company Fastener assembly
US7410337B2 (en) 2001-08-20 2008-08-12 The Maclean-Fogg Company Fastener assembly
US7438512B2 (en) 2001-08-20 2008-10-21 Maclean-Fogg Company U-bolt assembly
US8011866B2 (en) 2001-08-20 2011-09-06 Maclean-Fogg Company Locking fastener assembly
US20060039775A1 (en) * 2002-10-02 2006-02-23 Hiromichi Mizuno Tapping screw
US20090053008A1 (en) * 2005-05-31 2009-02-26 Topura Co., Ltd. Tapping screw
US7780388B2 (en) * 2005-05-31 2010-08-24 Topura Co., Ltd. Tapping screw
US20080219800A1 (en) * 2007-03-06 2008-09-11 Van Cor Dale E Threaded fastener and fastener system
US8858144B2 (en) * 2007-03-06 2014-10-14 Dale E. Van Cor Threaded fastener and fastener system

Also Published As

Publication number Publication date
FR1395476A (fr) 1965-04-09
LU46139A1 (es) 1964-11-23
BE648546A (es) 1964-11-30
DE1477053A1 (de) 1969-07-31
GB1051769A (es)
NL6406010A (es) 1965-01-19

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