US3722670A - Clip stack - Google Patents

Clip stack Download PDF

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Publication number
US3722670A
US3722670A US00126018A US3722670DA US3722670A US 3722670 A US3722670 A US 3722670A US 00126018 A US00126018 A US 00126018A US 3722670D A US3722670D A US 3722670DA US 3722670 A US3722670 A US 3722670A
Authority
US
United States
Prior art keywords
clip
stack
notch
filamentary
key
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
US00126018A
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English (en)
Inventor
L Plunkett
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.)
Signode Corp
Original Assignee
Signode 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
Application filed by Signode Corp filed Critical Signode Corp
Application granted granted Critical
Publication of US3722670A publication Critical patent/US3722670A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/14—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same
    • B25B27/146—Clip clamping hand tools
    • 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
    • F16B15/00—Nails; Staples
    • F16B15/08—Nails; Staples formed in integral series but easily separable
    • 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
    • F16B2/00—Friction-grip releasable fastenings
    • F16B2/20—Clips, i.e. with gripping action effected solely by the inherent resistance to deformation of the material of the fastening
    • F16B2/22—Clips, i.e. with gripping action effected solely by the inherent resistance to deformation of the material of the fastening of resilient material, e.g. rubbery material
    • F16B2/24—Clips, i.e. with gripping action effected solely by the inherent resistance to deformation of the material of the fastening of resilient material, e.g. rubbery material of metal
    • F16B2/241—Clips, i.e. with gripping action effected solely by the inherent resistance to deformation of the material of the fastening of resilient material, e.g. rubbery material of metal of sheet metal
    • F16B2/245—Clips, i.e. with gripping action effected solely by the inherent resistance to deformation of the material of the fastening of resilient material, e.g. rubbery material of metal of sheet metal external, i.e. with contracting action
    • 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
    • F16B7/00—Connections of rods or tubes, e.g. of non-circular section, mutually, including resilient connections
    • F16B7/04—Clamping or clipping connections
    • F16B7/0433—Clamping or clipping connections for rods or tubes being in parallel relationship
    • 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
    • Y10T403/00—Joints and connections
    • Y10T403/71—Rod side to plate or side
    • Y10T403/7129—Laterally spaced rods
    • Y10T403/7141—Plural channels in connector

Definitions

  • ABSTRACT A clip stack, a method of forming a rigidified joint, and the resulting joint.
  • Filler material is positioned adjacent wires to be clinched by a clip, and is clinched with the wires to deform and to be compressed by the clip and wires to form a stronger and more rigid joint.
  • the filler material may be carried by the clip, and may be severed from a clip stack joined by a strand of filler material from which filler material is severed as a clip is separated from the stack.
  • the filler material may be at both sides of the stack and in an interference fit in notches in opposite sides of the clips of the stack.
  • This invention relates to a method of forming a rigidificd joint consisting of at least a pair of elements, such as wires locally embraced by a clinched clip, to the improved joint so formed and to a clip stack especially assembled to be used in forming such a rigiditied joint.
  • a commonly used expedient for joining such elements locally is a clip, which clip is then clinched about the elements.
  • a typical clip and a typical tool for clinching such a clip are illustrated in US. Pat. No. 2,574,811.
  • Other clips used for similar purposes are illustrated, for example, in US. Pat. No. 3,032,184.
  • clips of the types illustrated in such patents have been used successfully to locally join elements, such as wires, too frequently the joints formed are somewhat loose, sometimes resulting in misalignment of parts of the joined elements, sometimes resulting in squeaky assemblies, etc.
  • clips of the types illustrated in such patents to be usable in fastacting tools must be assembled into stacks. Although various modes of assembling them have been suggested and used, most stacks require either difficult assembly operations to form them or once formed are too rigid or fragile, which stacks then easily separate and scatter, unless very carefully handled.
  • an improved clip stack is provided, which clip stack when used in a clinching tool results in the formation of an improved localized joint.
  • Joints formed in accordance with prior art procedures usually comprise a clinched clip and at least a pair of elongate elements, such as wires, locally embraced by the clinched clip.
  • An improved joint of this 7 invention also incorporates tightly compressed dunnage or filler material disposed between the clinched clip and the wires, and in engagement with each of them, for resisting movement of the wires with respect to the clip.
  • Theclip may also be notched to provide a localized weak area, so that as it is clinched about the wires, it buckles into closer conformity with the wires, thereby further to assist in providing a rigidified joint.
  • a clip and filler material are positioned adjacent the localized region of the wires to be clinched, and the clip is clinched about the wires and the tiller material, to compress, to deform and to relocate the filler material, thereby to form a tightly wrapped joint.
  • the filler material is associated with the clip as it is separated from a clipstack, and is carried by the clip into engagement with the wires, where the filler material is released to be compressed and deformed within the clinched clip to form the rigiditied joint.
  • the filler material is associated with the clip, it preferably derives from continuous filamentary key material joining a plurality of like clips into a stack.
  • the clips may be generally U-shaped and define notch segments longitudinally of the stack frictionally engaging the key material, so that when a clip is separatedfrom.
  • a segment of the key is severed from the key material and that segment is then carried by the clip for subsequent compression and deformation in the joint.
  • FIG. 1 is a perspective view of a clip formed in accordance with the present invention
  • FIG. 2 is a perspective view of a clip blank from which the clip of FIG. 1 may be formed;
  • FIG. 3 is a perspective view of a stack of clips in'accordance with FIG. 1;
  • FIG. 4 is an enlarged fragmentary view of a portion of a clip of the stack of FIG. 3;
  • FIG. 5 is a fragmentary view of a clip tool, prior to separation of a clip from a clip stack; 7
  • FIG. 6 is a view similar to FIG. 5, showing a clip separated from the clip stack
  • FIG. 7 is a view similar to FIG. 5, showing a partially clinched clip
  • FIG. 8 is an enlarged view similar to FIG. 7, showing the clip of FIG. 7 fully clinched;
  • FIG. 9 is a perspective view of a clinched clip and joint of FIG. 8 taken substantially along the line 99 of FIG. 10;
  • FIG. l0- is a fragmentary perspective view of a spring assembly clinched in accordance with this invention.
  • the clips cor the embodiment of FIGS. 1 to 4 are each formed from a rectangular sheet metal blank B (FIG. 1) that includes openings in the form of slots or notches in opposite side edges thereof.
  • the blank B comprises notch means including a first pair of notch segments or notchesl2 and a second pair of notch segments or notches 14, each pair at one side edge -10 of the blank.
  • the notches 12, 14 are formed by a punching operation.
  • The'blank B is bent around a generally centrally disposed fold line 16 to provide a generally rounded central body portion 18, and downwardly extending, spaced parallel leg portions 20.
  • Theresulting clips C are adapted to be positioned in an adjacent or juxtaposed relationship with respect to one another, with the surfaces of the leg portions 20 of adjacent clips to be positioned in abutting contact with each other, thereby to be formed into stacks S in the manner to be described.
  • notches 12, 14, respectively are aligned longitudinally of a stack.
  • notches 12, 14 are adapted, respectively, to receive continuous connecting filamentary keys or filaments 22 at opposite side edges 10, desirably in an interference fit.
  • Typical suitable filaments 22 are illustrated as being generally circular in cross-section and as having a diameter slightly greater than the width of notches 12, 14. (See FIG. 4.) As such, when the filaments 22 are press fit into frictional engagement in notches l2, 14, they function as keys to secure the clips C to each other in continuous stacks S. Desirably, the transverse dimension of the notches 12, 14 is, greater than the vertical dimension, so that when the filamentary material is circular, it is completely within the confines or projection of the side edges 10 of the stack S. Regardless of the configuration of the filament 22, it is desirable that itbe entirely within the confines of the side edges 10, so
  • notches 12, 14 may be about 0.062 inch wide and about 0.12 inch deep.
  • the filaments 22 may be about 0.067 inch in diameter.
  • Filaments 22 are preferably formed of an inexpensive plastic material, such as a low-density polyethylene, Such filaments are sufficiently limber to allow the individual clips in the stack S to flex slightly.
  • the individual clips of such a to a position in which the ends of the leg portions contact the clinching surfaces of the jaw 50, gradually to wrap the clip about the localized region of th'e'wires W, i.e., for example, as progressively illustrated in,
  • segments 22' are compressed against and between the inner surface of clip C and the wires W they gradually deform and are extruded. l'n the case of polyethylene, they may well be shorn or cut into several relocated sections 22", but, many event, the material remains substantially within the confines of the side edges 10 of the clinched clip C, thereby to provide stabilizing and rigidifying filler between the wires and the 7 clip C'.
  • the filler material may tend to be extruded stack S can be readily separated from one another,
  • polyethylene is a preferred material, for the purpose of providing a filler material to enhance joint rigidity
  • other materials maybe used as well, such as, forexample, soft wire, twine, solder, etc.
  • FIGS. 1 to 4 are adapted to be used to clinch at least two elongate elements, such as wires or the like together, to form a rigiditied localized joint" 52.
  • a stack S of clips maybe fed to the position illustrated in FIG. 5 in a magazine 54 associated with the tool, as by a suitable follower (not shown).
  • vA typical clinching tool 40 embodying such features is described 7 in Blume'nsaadtUS. Pat. No. 2,574,811.
  • a clip stackIS as'illustrated in FIG. 3, is placed injoint stability.
  • wires W are positioned adjacent the jaw 50, with the localized regionsto be clinched, being positioned within the side edges of the jaw.
  • Wires W may be circular in cross section, or may be of other cross-sectional configurations/With the wires W so positioned, the tool is actuated and the clinching-blade 52 is thrust downwardlyfrom the position of FIG, 5 towards the jaw 50. It contacts a central body portion 18 0f a clip C, and drives the clip C downwardly simultaneously severing a clip C and shearing filament segments 22' from the stack 8 adjacent the interface of adjacent leg portions 20.
  • the severed clip C carries segments 22 downwardly, -as illustrated in FIGS. 3 and 6.
  • the clinching blade 52 then release the segments 22 from the notches 12, 14, and
  • the filamentary material cooperates to form a rigiditied joint which resists relative movement betweenthe clinched .clip C and the wires W, both longitudinally of the joint 100, and about the axes of the wires W.
  • the spaced pair of laterally spaced segments 22' form relocated sections 22" at two spaced areas, further enhancing The upper surface of a wire W will cooperate with. the inner surface of the clip in the manner of a hammer and anvil to deform, ex'trude and relocate the filler material.
  • the wires W are circular in cross section, the wire and clip surfaces will tend to relocate the filler material into the areas adjacent the contacting surfacesof the wires, and only a very small amount of tiller material will be necessary to stabilize the joint, as
  • filler material may be introduced separately from the clip, as with the wires, to position it for clinching with a clip and wires to form a filled, rigidified joint.
  • An elongate clip stack comprising a plurality of similarly shaped, non-nested adjacent clips, each clip being generally U-shaped in cross-section, and each clip including spaced, generally parallel, leg portions extending downwardly from a central web portion, each clip in said stack being positioned with its leg portions in contact with leg portions of next adjacent clips, each said clip defining notch means aligned with notch means of other of said clips longitudinally of said stack, each leg portion having outer edges with an outwardly facing notch segment in an outer edge of each leg portion, the notch segments of each clip cooperating to form a said notch means, all of said notch means collectively defining a keyway extending longitudinally and opening outwardly of said stack, a filamentary key in frictional engagement within each of said spaced notch segments, whereby when a clip is separated from said stack, a segment of said filamentary key between said notch segments is severed from the key and is carried by a said separated clip.
  • An elongate clip stack in accordance with claim 1, comprising second notch segments and a second filamentary key in opposite side edges of said leg portions, whereby when a clip is separated from said stack, segments of said filamentary keys between said notch segments are severed from said keys and are carried by a separated clip.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Clamps And Clips (AREA)
  • Wire Processing (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Basic Packing Technique (AREA)
US00126018A 1971-03-19 1971-03-19 Clip stack Expired - Lifetime US3722670A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US12601871A 1971-03-19 1971-03-19

Publications (1)

Publication Number Publication Date
US3722670A true US3722670A (en) 1973-03-27

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ID=22422564

Family Applications (1)

Application Number Title Priority Date Filing Date
US00126018A Expired - Lifetime US3722670A (en) 1971-03-19 1971-03-19 Clip stack

Country Status (11)

Country Link
US (1) US3722670A (ja)
JP (1) JPS5723125B1 (ja)
AU (1) AU455336B2 (ja)
BE (1) BE779059A (ja)
BR (1) BR7201567D0 (ja)
CA (1) CA962823A (ja)
ES (1) ES401575A1 (ja)
FR (1) FR2129691A5 (ja)
GB (2) GB1332762A (ja)
IT (1) IT948415B (ja)
SE (1) SE382246B (ja)

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3841473A (en) * 1972-10-16 1974-10-15 Signode Corp Fastener stack and fasteners having bodies of foam
US3845860A (en) * 1971-04-01 1974-11-05 Multifastener Corp Fastener strip
US4124050A (en) * 1976-09-03 1978-11-07 Action Machining Corp. Action piercing fastener
US4125188A (en) * 1975-11-07 1978-11-14 Banholzer & Wenz Stackable strapping fastener
DE3244929A1 (de) * 1982-04-09 1983-10-13 Hartco Co., Lincolnwood, Ill. Klemmschellenkette
US5303821A (en) * 1992-11-06 1994-04-19 Ayres Donald B Resilient clip assembly
US5314065A (en) * 1993-05-03 1994-05-24 L&P Property Management Company Sheet metal clip
US5314064A (en) * 1993-05-03 1994-05-24 L&P Property Management Company Sheet metal clip
US5564564A (en) * 1995-06-16 1996-10-15 L&P Property Management Company Collated clip assembly
WO1997033816A1 (en) * 1996-03-12 1997-09-18 Stanley/Hartco Company Improved resilient u-clip assembly
US5833064A (en) * 1996-05-17 1998-11-10 Vertex Fasteners String of anchor clips
US5878880A (en) * 1995-06-16 1999-03-09 L&P Property Management Company Collated clip assembly
US5927491A (en) * 1996-03-12 1999-07-27 Stanley/Hartco Company Resilient U-clip assembly
US6044530A (en) * 1997-10-02 2000-04-04 Stanley Fastening Systems, L.P. Slotted clip and method
FR2812228A1 (fr) * 2000-07-25 2002-02-01 Pierre Dubois Procede pour relier deux fils entre eux par agrafage
US20050013679A1 (en) * 2001-08-15 2005-01-20 Ladoucer Harold A. Self-attaching fastener systems
US20070289252A1 (en) * 2005-02-04 2007-12-20 Poly-Clip System Corp. Clip and clipper
US20090223026A1 (en) * 2008-03-07 2009-09-10 West Robert J U-clip assembly and method
US8991016B2 (en) 2012-10-10 2015-03-31 L&P Property Management Company Clip assembly for use holding sinuous springs
US9427094B2 (en) 2012-10-10 2016-08-30 L&P Property Management Company Clip assembly for use holding sinuous springs
US20160369825A1 (en) * 2015-06-19 2016-12-22 L&P Property Management Company Clip Assembly For Use Holding Sinuous Springs
US9777758B2 (en) 2012-10-10 2017-10-03 L&P Property Management Company Clip assembly for use holding sinuous springs
US10221967B2 (en) * 2014-08-19 2019-03-05 Matrix Composites And Engineering Ltd. Clamp for a flexible pipe

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2245279C3 (de) * 1972-09-15 1981-03-26 No-Sag Drahtfedern GmbH, 33397 Rietberg Werkzeug zum Schließen einer Breitbandklammer zum Verklammern von Drähten
JPS62136383A (ja) * 1985-11-21 1987-06-19 海老原　代師行 ステ−プラ
GB2217286A (en) * 1988-04-18 1989-10-25 Walter Alfred James Joyce A process for producing packs of small parts and packs produced by the process

Cited By (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3845860A (en) * 1971-04-01 1974-11-05 Multifastener Corp Fastener strip
US3841473A (en) * 1972-10-16 1974-10-15 Signode Corp Fastener stack and fasteners having bodies of foam
US4125188A (en) * 1975-11-07 1978-11-14 Banholzer & Wenz Stackable strapping fastener
US4124050A (en) * 1976-09-03 1978-11-07 Action Machining Corp. Action piercing fastener
DE3244929A1 (de) * 1982-04-09 1983-10-13 Hartco Co., Lincolnwood, Ill. Klemmschellenkette
US4508220A (en) * 1982-04-09 1985-04-02 Hartco Company U-Clip assembly and method of producing and utilizing the same
AU673220B2 (en) * 1992-11-06 1996-10-31 L&P Property Management Company Resilient clip assembly
WO1994011273A1 (en) * 1992-11-06 1994-05-26 Ayres Donald B Resilient clip assembly
US5303821A (en) * 1992-11-06 1994-04-19 Ayres Donald B Resilient clip assembly
US5314065A (en) * 1993-05-03 1994-05-24 L&P Property Management Company Sheet metal clip
US5314064A (en) * 1993-05-03 1994-05-24 L&P Property Management Company Sheet metal clip
WO1994025362A1 (en) * 1993-05-03 1994-11-10 L & P Property Management Company Improved sheet metal clip
US5564564A (en) * 1995-06-16 1996-10-15 L&P Property Management Company Collated clip assembly
US5878880A (en) * 1995-06-16 1999-03-09 L&P Property Management Company Collated clip assembly
WO1997000215A1 (en) * 1995-06-16 1997-01-03 L & P Property Management Company Collated clip assembly
US5682994A (en) * 1995-06-16 1997-11-04 L&P Property Management Company Collated clip assembly
US5927491A (en) * 1996-03-12 1999-07-27 Stanley/Hartco Company Resilient U-clip assembly
WO1997033816A1 (en) * 1996-03-12 1997-09-18 Stanley/Hartco Company Improved resilient u-clip assembly
US6055716A (en) * 1996-05-17 2000-05-02 Vertex Fasteners Method for fixing anchor clips to a furniture rail
US5833064A (en) * 1996-05-17 1998-11-10 Vertex Fasteners String of anchor clips
US6044530A (en) * 1997-10-02 2000-04-04 Stanley Fastening Systems, L.P. Slotted clip and method
EP0907033A3 (en) * 1997-10-02 2000-04-19 Stanley Fastening Systems, L.P. Slotted clip and method
US6357588B1 (en) 1997-10-02 2002-03-19 Stanley Fastening Systems, Lp Slotted clip and method
FR2812228A1 (fr) * 2000-07-25 2002-02-01 Pierre Dubois Procede pour relier deux fils entre eux par agrafage
US7427180B2 (en) 2001-08-15 2008-09-23 Whitesell International Corporation Self-attaching fastener systems
US20050013679A1 (en) * 2001-08-15 2005-01-20 Ladoucer Harold A. Self-attaching fastener systems
US7565780B2 (en) * 2005-02-04 2009-07-28 Poly-Clip System Corp. Clip and clipper
US20070289252A1 (en) * 2005-02-04 2007-12-20 Poly-Clip System Corp. Clip and clipper
US20090223026A1 (en) * 2008-03-07 2009-09-10 West Robert J U-clip assembly and method
US7882948B2 (en) * 2008-03-07 2011-02-08 West Robert J U-clip assembly and method
US8991016B2 (en) 2012-10-10 2015-03-31 L&P Property Management Company Clip assembly for use holding sinuous springs
US9420897B2 (en) 2012-10-10 2016-08-23 L&P Property Management Company Clip assembly for use holding sinuous springs
US9427094B2 (en) 2012-10-10 2016-08-30 L&P Property Management Company Clip assembly for use holding sinuous springs
US9770116B2 (en) 2012-10-10 2017-09-26 L&P Property Management Company Clip assembly for use holding sinuous springs
US9777758B2 (en) 2012-10-10 2017-10-03 L&P Property Management Company Clip assembly for use holding sinuous springs
US10221967B2 (en) * 2014-08-19 2019-03-05 Matrix Composites And Engineering Ltd. Clamp for a flexible pipe
US20160369825A1 (en) * 2015-06-19 2016-12-22 L&P Property Management Company Clip Assembly For Use Holding Sinuous Springs
US9933000B2 (en) * 2015-06-19 2018-04-03 L&P Property Management Company Clip assembly for use holding sinuous springs

Also Published As

Publication number Publication date
CA962823A (en) 1975-02-18
DE2211211A1 (de) 1972-10-05
GB1332762A (en) 1973-10-03
SE382246B (sv) 1976-01-19
JPS5723125B1 (ja) 1982-05-17
FR2129691A5 (ja) 1972-10-27
AU3865372A (en) 1973-08-09
IT948415B (it) 1973-05-30
BE779059A (fr) 1972-05-30
AU455336B2 (en) 1974-11-07
ES401575A1 (es) 1975-11-01
GB1332761A (en) 1973-10-03
BR7201567D0 (pt) 1973-08-21
DE2211211B2 (de) 1976-05-06

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