US3541929A - Bag machines - Google Patents

Bag machines Download PDF

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Publication number
US3541929A
US3541929A US787767A US3541929DA US3541929A US 3541929 A US3541929 A US 3541929A US 787767 A US787767 A US 787767A US 3541929D A US3541929D A US 3541929DA US 3541929 A US3541929 A US 3541929A
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United States
Prior art keywords
seal bar
web
bag
machine
line
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
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US787767A
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English (en)
Inventor
Donald C Crawford
Robert J Wech
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FMC Corp
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FMC Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/14—Cutting, e.g. perforating, punching, slitting or trimming
    • B31B70/16—Cutting webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2155/00—Flexible containers made from webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2155/00—Flexible containers made from webs
    • B31B2155/001—Flexible containers made from webs by folding webs longitudinally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2155/00—Flexible containers made from webs
    • B31B2155/001—Flexible containers made from webs by folding webs longitudinally
    • B31B2155/0014—Flexible containers made from webs by folding webs longitudinally having their openings facing transversally to the direction of movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2160/00—Shape of flexible containers
    • B31B2160/10—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents

Definitions

  • the bag machine of the present disclosure comprises the usual heated reciprocating cutting and sealing bar which separates and welds a folded sheet of thermoplastic web into bags.
  • a pneumatic cylinder operated by a control circuit, moves a wedge shape block to prevent reciprocation of the seal bar by holding it in its raised position whenever the machine operator desires to interrupt web movement through the bag machine or when a predetermined number of bags have been produced.
  • bag machines produce normal size bags at a rate of 150 to I70 bags per minute.
  • the bags produced are discharged to a stacking table, which is usually provided with fences or abutments. WhlCh constrain the bags to stack in a neatly registered pile
  • Various arrangements are available for producing overlapping or shingled stacks of bags with each stack containing a predetermined number of bags.
  • the stacking tables of some bag machines include an in dexing conveyor for supporting the stacks of bags and the degree to which the conveyor is indexed determines the degree of overlap of the bag stacks. Such a system provides the operator with a reasonable amount of time to unload the bag stacks for storage or removal to bag filling machinery.
  • the present invention provides a suitable electrical control which deenergizes the clutch and energizes the brake simultaneously so that web development is arrested while the drived train of the bag machine remains activated.
  • the electrical controls disclosed with the present invention are coordinated with the mechanical elements so that when the brake is deenergized and the clutch energized.
  • bag production is resumed at the initiation of a bagmaking cycle. This is preferably accomplished by sending a signal through an interlock switch which is controlled by a cam. At the proper time in the cycle the cam actuates the switch energizing a relay which initiates an interruption.
  • FIG. I is a side elevation of a bag machine incorporating the principles of this invention.
  • FIG. 2 is an enlarged prospective of a portion of the bag machine shown in FIG. 1, particularly illustrating details of the seal bar structure and its relationship witha bag transporting conveyor;
  • FIGS. 3, 4 and 5 show, respectively, the relationship assumed by the seal bar structure during normal operation and when it is in its down position during severing and sealing of the thermoplastic web, in its raised position and when the machine has been signalled for interrupt, and when an interrupt cycle is in progress;
  • FIG. 6 is an enlarged fragmentary portion of FIG. 1 as viewed substantially along the line 6-6 showing cam actuated limit switches;
  • FIG. 7 diagrammatically shows a portion of the seal bar and a schematic of the electrical control circuit for initiating an interrupt cycle.
  • FIG. 1 illustrates a portion of a bag machine 10 incorporat ing the present invention.
  • the thermoplastic web processed by the machine is indicated by the letter TW and it moves through the machine in the direction of the arrow A by draw rolls 12 shown in dotted lines.
  • draw rolls 12 shown in dotted lines.
  • the thermoplastic web has progressed to the point shown in FIG. 2, it has been folded and gussetted by mechanisms, the details of which are disclosed in the above Wech application.
  • the web is engaged by a reciprocating seal bar structure 14 whose operation is coordinated with the intermittent movement of the thermoplastic web, and it is effective to sever and weld the web along a line transverse to its direction of movement.
  • the stacking table may be provided with sheet metal fences against which adjacent margins of the bag engage to thereby produce a neatly stacked pile.
  • each side frame On a base plate 20 laterally spaced generally similar side frames are supported to extend vertically upwardly and are identified in FIG. 2 by the numerals 22 and 24.
  • On the upper surface of each side frame means 26 are mounted thereon for holding the seal bar structure 14 in its raised position whenever interruption of web development is selected by the operator or automatically selected after a predetermined count by the control circuit of the machine.
  • the means 26 comprise pneumatic cylinders 28 supplied at their head ends with pressure fluid by conduit 30 which is connected to a flow control valve 32.
  • the flow control valve is in turn connected to an electrically operable valve 34 which upon command of the electrical circuit connects the conduit 30 to a source of pressure of air to thereby extend the piston of each cylinder 28.
  • Each of the cylinders 28 are provided with a projecting rod 36 having attached thereon a block 38 preferably made of nylon which is formed with an inclined surface 40 that makes contact with a complimentary inclined surface 42 formed on a block 44 rigidly connected to seal bar mounting posts 46.
  • the rod 36 is extended locating the block 38 under the block 44, and since the block 44 is rigidly connected to the seal bar mounting post 46, reciprocation of the seal bar is prevented.
  • Reference to FIG. 5 will show the block 38 in position to prevent reciprocation of the seal bar structure 14. i
  • FIG. 2 which shows the seal bar structure 14 in enlarged-prospective, it will be observed that a beam 48 extends between the mounting post &6 and each end of the beam is provided with a short stub shaft portion 50 rotatably mounted in the posts 46.
  • a plurality of spaced thin and metal clips 52 have one end rigidly attached to the lower surface of the beam 48 and the other end secured to a seal bar 54.
  • thermoplastic web TW assumes a path through the bag machine bringing it between the seal roll 56 and a seal bar 54 so that upon downward movement of the seal bar, the thermoplastic web is transversely welded and severed thereby producing a bag.
  • the conveyor assembly 16 comprises a series of lower belts 60 whose upper reaches move in the direction of the arrow B and are trained about an idler shaft 62. Also provided are a series of transversely spaced upper belts 64 trained about idler shafts 66 that are rotatably mounted in arms 68 keyed to an oscillating shaft 70.
  • the shaft 70 is mounted in bearings 72 carried on the upper surface of the side frames 22 and 24.
  • the drived train of the bag machine includes a cam and linkage arrangement for oscillating the shaft 70, however disclosure herein is not deemed essential since such structure is not directly pertinent to the present invention.
  • the idler shafts 66 are also oscillated moving the belts 64 toward and away from the upper reaches of the belt 60.
  • the bag machine is synchronized so that that portion of the thermoplastic web TW which projects donwstream (from right to left as viewed in FIG. 2) from the seal bar 54 and the seal roll 56 is gripped between the conveyors 60 and 64 immediately after the thermoplastic web has been welded and severed and the bag is thence transported to the stacking table.
  • Reciprocation of the seal bar structure 14 is accomplished by connecting the mounting post 46 to a push rods 74 (only one of which is shown FIGS. 1, 3--5, and FIG. 7) having secured at their lower ends a slotted block 76 rotatably mounting a roller 78 in contact with a plate cam 80 keyed to a shaft 82.
  • the upper end of the push rods 74 are slidably received within the mounting post 46 in order to provide relative movement between the push rods and the mounting posts under certain operative conditions as will be explained presently.
  • Rigidly attached to the push rods 74 are plates 84 that extend laterally outwardly relative to the side frame 22 and 24. Mounted to these plates are double acting pneumatic actuators 36.
  • the actuators 86 are provided with a projecting rod 88 rigidly attached to an car 90 which is integral with the seal bar mounting posts 46.
  • the actuators 86 fulfills the function of a fluid clamp when its rod end is supplied with pressure air by the pneumatic circuit thus holding the mounting post 46 in firm engagement with the plate 84, but as will be pointed out, the magnitude of force supplied by the actuators 86 is insufficient to prevent relative movement between the mounting post 46 and the push rods 74.
  • FIG. 5 shows this condition and in addition shows the cam E50 presenting its minimum radius in contact with the roller 78, which is the down position of the seal bar.
  • Locating the block 38 to make contact with the block 44 prevents reciprocation of the seal bar structure 14, however the push rods 74 continue reciprocation since they are slidably mounted in the mounting posts 46.
  • the actuators 86 have air under pressure continually supplied to their rod ends springs 92 are provided to maintain the roller 78 in contact with the cam 80. Also contributing in holding the roller 73 in contact with the cam is the weight of the push rods 74.
  • the control circuit shown in FIG. 7 is provided. Further, to achieve smooth action on stopping and starting web development the controls are arranged so that the seal bar structure 14 does not commence reciprocation until the push rods 74 reach their highest point which is shown in FIG. Synchronizing withdrawal of the block 38 when the high dwell portion 80a of the cam 80 comes in contact with the roller 78 insures smooth start up of the seal bar by preventing relative motion between the push rod 74 and the seal bar structure 14.
  • various interrupt options are available to the operator, one of which is a foot switch FS (FIG. 1) connected to the control circuit by an electrical lead MI It will be observed that the foot switch is located in the area of the stacking table 18 so that it is within easy reach of the operators foot while he is in position to manually grasp and remove a stack of bags from the stacking table 18. As will be explained in greater detail presently momentary actuation of the foot switch energizes a relay which actuates the brake and releases the clutch thereby arresting web development. Also the block 3% is positioned under the block 44 to discontinue reciprocation of the seal bar structure 14.
  • the operator so desires the interrupt time of the machine can be extended by either maintaining pressure on a foot switch or by operating a toggle switch S9 mounted in a control box 96 supported by the stacking table 1.8.
  • the interrupt time of the machine is set between 0.3 to 3.5 seconds and such interrupt time is initiated by merely tapping the foot switch.
  • Upon expiration of the interrupt time production automatically resumes. It is also possible, and under certain conditions advantageous, to provide the control circuit with a predetermining counter operating to automatically interrupt cycle operation after a selected number of bags have been made and then resume production after the preset time delay has expired.
  • FIG. 7 The portion of the bagmachine control circuit which effects interruption of seal bar reciprocation and web development is shown in FIG. 7. It is to be understood, however, that only that portion of the control circuit is shown which is relevant to the present invention. For example, the main drive motor, holepunching accessories, heater bar control and static eliminators, all of which are connected to the control circuit of the machine are not shown since they do not relate to the present invention.
  • FIGS 1 and 6 there is shown a shaft .97 having a reduced diameter portion 98 extending through the side frame 24. On the shaft portion 98 there are keyed cams 100 and 102 for actuating limit switches SLS and 6L8 attached to posts 104 and 106, respectively.
  • the limit switch 5LS provides a machine-timed switching of count pulses and it has two sets of contacts, one for pulsing the totalizing counter and the other for pulsing the predetermining counter.
  • the limit switch 6L5 also provides a machine timed pulse which insures stopping and starting of the bag machine at a certain point of its cycle to eliminate the possibility of partial draw of the thermoplastic web.
  • FIG. 7 illustrates the schematic circuit diagram and a fragmentary portion of the seal bar and the seal bar drive. Also mounted on the shaft 82 there is a cam 108 which is engaged by and actuates a limit switch 3LS which alternately makes contact with leads S and 207 for energizing, respectively, the clutch C and the brake B through a clutch-brake control.
  • the cycle interrupt circuit shown in FIG. 7 has three basic modes of operation which can be incorporated individually or collectively as desired but for purposes of the present disclosure all three systems are shown and will be described.
  • a foot switch FS is provided in a line 206 .
  • the operator depresses the foot switch which energizes relay SCR in the line 218. This closes normally open contacts 3CR-1 in line 214 and when the limit switch 6L8 pulses down, making contact with contacts C-2, relay 2CR in line 206 is energized.
  • Energization of relay 2CR closes contacts 2CR-3 in line 206, opens normally closed contacts 2CR-1 in line 226, and opens normally closed contacts 2CR-2 in line 250.
  • cams 100 and 102 operating limit switches 5LS and 6L5 respectively continually rotate to provide a machine timed pulses for counting and for interrupting and commencing machine operation at a particular point of a bag-making cycle. Opening of contacts 2CR-l in line 226 deenergizes the clutch and maintains the brake energized thereby interrupting web development.
  • relays 4CR, in line 212, and ITR in line 216 are energized.
  • Energizing relay 4CR in 212 opens normally closed contacts 4CR-l in line 258, closes normally open contacts 4CR-2 in line 236 and opens normally closed contacts 4CR-2 in line 242.
  • Opening contacts 4CR-1 in line 248 disarms the predetermining counter circuitry while opening of normally closed contacts 2CR-2, in line 250, disarms the totalizing counter.
  • Momentary actuation of the foot switch also causes energization of solenoid 110 shifting the spool in the valve 34 to thereby admit air under pressure to the cylinder 28 by the conduit 30 through the flow control valve 32.
  • the piston rod 36 and the block 38 carried thereby are translated toward and under the block 44 thereby interrupting reciprocation of the seal bar 54.
  • the period of time in which the block 38 remains in the seal bar interrupt position (shown in FIG. 5) is depen dent upon the setting of the time delay relay ITR in line 216.
  • the time delay relay can be set for any reasonable interrupt time which may extend from 0.3 to 3.5 seconds.
  • This relay is a delay on pull-in type; After the time delay period, contacts lTR open in line 210 and when the 6L8 engages contacts C2 relays ZCR, dCR and 3CR are deenergized. Slnce the valve 34 is provided with a spring return the rod 36 is immediately retracted upon deenergization of the solenoid 110 by virtue of deenergization of relay 3CR and consequent opening of contacts SCR-l in line 214. Machine operation is resumed at that point of the machine cycle where a full draw of the web can be effected. The machine, of course, then resumes its normal clutch brake operation by closing of contacts ZCR-l in line 226 occasioned by deenerigization of relay ZCR in line 206. In addition, contacts dCR-Z in line 236, MIR-2 in line 2&2 and 4CR-l in line 248 return to the condition shown in FIG. 7.
  • the predetermining counter is electrically connected to a capacitor 01 in line 2 32 which operates to reset the counter when relay 4CR is energized.
  • dCR-Z in line 236 is closed and 4CR-2 in line 242 is opened the capacitor discharges resetting the counter to its predetermined reading.
  • a predetermining counter found suitable is manufactured by SODECO and sold through LANDIS & GYR Inc. of 45 West 45th Street, New York, NY.
  • the model number of such counter is NO. 2TCeF4PE.
  • the clutch-brake control is made by Warner Electric Brake and Clutch Company of Beloit, Wisconsin and is identified by model number 80l6-00l-XXX.
  • the bag machine of the present invention provides an apparatus which interrupts web development and reciprocation of the seal bar at any time determined by the operator or when a selected number of bags have been produced.
  • a bag machine for making bags from folded or tubular thermoplastic web by intermittently feeding and severing the web by a seal bar structure, including a seal bar which is rendered inactive when web movement is momentarily interrupted,'said machine comprising means for actuating the seal bar, and means for interrupting actuation of the seal bar while maintaining operation of said seal bar actuating means, and wherein said seal bar interrupting means maintains said seal bar in a location spaced from the thermoplastic web so that damage to the web is prevented.
  • a bag machine for making bags from folded or tubular thermoplastic web by intermittently feeding and severing the web by a seal bar structure, including a seal bar which is rendered inactive when web movement is momentarily interrrupted, said machine comprising means for actuating the seal bar, and means for interrupting actuation of the seal bar while maintaining operation of said seal bar actuating means, and wherein said seal bar interrupting means comprises means engageable with the seal bar structure for holding the seal bar in a raised position.
  • seal bar engaging means includes means for actuating said engaging means to effect interruption of said seal bar.
  • actuating means comprises a fluid cylinder, and means are provided for activating said actuator in synchronism with the bag machine drive.
  • An apparatus for maki'ngbags from folded or tubular thermoplastic web material comprising a seal bar apparatus for transversely sealing and cutting an intermittently fed ther moplastic web with said sealing and cutting occurring during a momentary repose period of such web; means, including cams and associated push rods, for reciprocating said seal bar apparatus; said seal bar apparatus comprising seal bar supporting members slidably mounting on the respective upper portions of said push rods; .fluid clamps for holding said supporting members against slidable movement relative to said push rods, and means for preventing reciprocation of said seal bar with said push rods while said fluid clamps are supplied with pressure fluid and said cams continue to reciprocate said push rods.
  • control means operated in time relation with said push rod actuating cams for initiating. reciprocation of said seal bar with said push rods when said cams have displaced said push rods to their upper position and thereby commence seal bar operation at the beginning of a bag-making cycle.
  • control means include means for interrupting web movement and seal bar reciprocation at the will of the operator or when a predetermined number of bags have been produced.
  • a seal bar structure for a bag-making machine of the type which produces bags from folded or tubular thermoplastic web material comprising elongate push rods, cams for reciprocating said push rods in unison, posts slidably receiving the upper end portions of said push rods, a seal bar extending between and supported by said posts, fluid clamps for holding said posts against slidable movement relative to said push rods, outwardly extending ledges rigidly secured to said posts, and means selectively or automatically located to engage said ledges to prevent reciprocation of said posts and accordingly said seal bar while reciprocation of said push rods continues.
  • a bag machine for making bags of folded or tubular thermoplastic web material comprising means for intermittently feeding the web material a desired amount, a reciprocating heated sea bar extending transversely to the direction in which the web is fed for sealing and severing the web at selected longitudinally spaced intervals, a drive mechanism for feeding the web material and reciprocating said seal bar, and means operable after a predetermined number of machine cycles or at the will of the operator for interrupting operation of said seal bar and said web-feeding means for at least one machine cycle while maintaining operation of the drive mechanism.
  • interrupting means includes means for terminating and initiating bag machine operation at the end and at the beginning, respectively, of a bag-making cycle.
  • seal bar drive means comprises a normally continuously running driving element for the seal bar, a composite reciprocable driven element with one part operated by the driving element and the other part connected to the seal bar, coupling means for normally causing said driven element parts to reciprocate together for reciprocating said seal bar, interrupter means for holding the driven element part connected to said seal bar against reciprocation when the seal bar has been lifted from the web, said coupling means accommodating continued reciprocation n of the other driven element part by said driving element, and means for actuating said interrupter means.
  • said driv ing element for the seal bar comprises a rotating cam
  • said means for actuating the interrupter means including a selectively energized control synchronized with said web feeder.
  • said coupling means for the driven element parts comprises a fluid cylinder assembly normally pressurized to couple the parts, said interrupter means holding said driven element against the pressure in said fluid cylinder assembly.
  • a bag machine for making bags from tubular or folded thermoplastic web comprising a platen underlying the web; a heated reciprocating seal bar engageable with said platen; drive means for coordinating intermittent feeding said web and reciprocation of said seal bar; said seal bar making contact with said platen when the web is momentarily at rest thereby transversely severing and sealing the web; means, operable after a predetermined number of machine cycle or at the will of the operator, for interrupting bag-making for at least one machine cycle; and means, effective during the interrupt period, for preventing said seal bar from contacting the web which thereby prevents heat damage to the web.

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  • Containers And Plastic Fillers For Packaging (AREA)
US787767A 1968-12-30 1968-12-30 Bag machines Expired - Lifetime US3541929A (en)

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Application Number Priority Date Filing Date Title
US78776768A 1968-12-30 1968-12-30

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US3541929A true US3541929A (en) 1970-11-24

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US787767A Expired - Lifetime US3541929A (en) 1968-12-30 1968-12-30 Bag machines

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US (1) US3541929A (id)
JP (1) JPS4919432B1 (id)
BE (1) BE743876A (id)
CA (1) CA918979A (id)
DE (2) DE1965254C3 (id)
ES (1) ES373518A1 (id)
FR (1) FR2027369A1 (id)
GB (1) GB1267720A (id)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4077306A (en) * 1976-10-21 1978-03-07 Fmc Corporation Bag machine cycle interrupt
CN102717529A (zh) * 2012-07-03 2012-10-10 王根乐 提高制袋机运转速度的方法
CN103112200A (zh) * 2013-01-18 2013-05-22 王根乐 下置热切刀式制袋机热切热封组件
CN104229511A (zh) * 2014-09-29 2014-12-24 任杰 一种塑料袋生产过程中的防松装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3663338A (en) * 1968-09-16 1972-05-16 Fmc Corp Bag machine
FR1599185A (id) * 1968-12-09 1970-07-15

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4077306A (en) * 1976-10-21 1978-03-07 Fmc Corporation Bag machine cycle interrupt
CN102717529A (zh) * 2012-07-03 2012-10-10 王根乐 提高制袋机运转速度的方法
CN102717529B (zh) * 2012-07-03 2013-10-23 王根乐 提高制袋机运转速度的方法
CN103112200A (zh) * 2013-01-18 2013-05-22 王根乐 下置热切刀式制袋机热切热封组件
CN103112200B (zh) * 2013-01-18 2014-10-08 王根乐 下置热切刀式制袋机热切热封组件
CN104229511A (zh) * 2014-09-29 2014-12-24 任杰 一种塑料袋生产过程中的防松装置

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Publication number Publication date
DE1965254B2 (de) 1972-09-28
DE1965254A1 (de) 1970-08-20
ES373518A1 (es) 1972-05-16
BE743876A (id) 1970-05-28
DE6950190U (de) 1984-07-26
DE1965254C3 (de) 1984-01-12
FR2027369A1 (fr) 1970-09-25
GB1267720A (en) 1972-03-22
CA918979A (en) 1973-01-16
JPS4919432B1 (id) 1974-05-17

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