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US3659312A - Multi-purpose vacuum cleaner nozzle - Google Patents

Multi-purpose vacuum cleaner nozzle Download PDF

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Publication number
US3659312A
US3659312A US92695A US3659312DA US3659312A US 3659312 A US3659312 A US 3659312A US 92695 A US92695 A US 92695A US 3659312D A US3659312D A US 3659312DA US 3659312 A US3659312 A US 3659312A
Authority
US
United States
Prior art keywords
air
path
brush
suction inlet
flow
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
US92695A
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English (en)
Inventor
Bo Gunnar Mattsson
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.)
Electrolux AB
Original Assignee
Electrolux AB
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 Electrolux AB filed Critical Electrolux AB
Application granted granted Critical
Publication of US3659312A publication Critical patent/US3659312A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/02—Nozzles
    • A47L9/06—Nozzles with fixed, e.g. adjustably fixed brushes or the like
    • A47L9/0633—Nozzles with fixed, e.g. adjustably fixed brushes or the like with retractable brushes, combs, lips or pads
    • A47L9/064—Nozzles with fixed, e.g. adjustably fixed brushes or the like with retractable brushes, combs, lips or pads actuating means therefor
    • A47L9/0646—Nozzles with fixed, e.g. adjustably fixed brushes or the like with retractable brushes, combs, lips or pads actuating means therefor with pneumatic actuation
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/02—Nozzles
    • A47L9/06—Nozzles with fixed, e.g. adjustably fixed brushes or the like

Definitions

  • a multi-purpose vacuum cleaner nozzle has a suction mlet [21] Appl, No.: 92,695 which is movable over a porous object like a rug to remove dirt therefrom.
  • a brush is mounted on the nozzle at the vicinity of the suction inlet for movement between upper and lower [30] Forelgn Apphcauon Pnomy Data positions. The brush in its lower position is below the suction Nov. 28, 1969 Sweden 16382/69 inlet and functions to remove dirt from a -P Object like a floor.
  • the suction inlet functions to remove dirt from a 52 0.5. Ci ..15/319, 15/371, 15 373 P Object when the brush is in its "PW P above the 51 1m. 01.
  • a brush When brushes are employed to suck and draw dust particles from essentially smooth objects like floors, for example, the pneumatic force just referred to is not as great as it is when a porous object is being cleaned.
  • a brush In cleaning porous objects like carpets, for example, a brush generally is not employed and instead a nozzle is employed having an operating surface which is at the immediate vicinity of the suction inlet opening and disposed about the latter.
  • This invention relates to a multi-purpose vacuum cleaner nozzle having a suction inlet and a brush mounted for movement on the nozzle between upper and lowerpositions, the brush in its upper position being above the suction inlet and in its lower position below the suction inlet.
  • the suction inlet When the brush is in its upper position the suction inlet is rendered operable to remove dust and dirt from porous objects like carpets and rugs.
  • the brush When the brush is in its lower position the brush is rendered operable to remove dust and dirt from non-porous objects like floors.
  • the brush is moved pneumatically between its upper and lower positions by mechanism which includes a rubber diaphragm to which the brush is connected, such diaphragm forming a wall of a space in communication with the path of air flow ofthe nozzle which is at a partial vacuum. Due to the sub-atmospheric pressure in the nozzle, which varies in accordance with the physical characteristics of the object over which the nozzle is moved, the diaphragm will flex to its upper or lower position and move the brush to its upper or lower position on the nozzle.
  • the diaphragm is biased to its lower position by a spring which is so adjusted that the brush can .be shifted on the nozzle solely due to changes in the physical characteristics of the object over which the nozzle is moved.
  • the vacuum producing ability of the vacuum cleaner connected to the nozzle should not vary within too wide limits. If the suction ability of the vacuum cleaner should decrease to an abnormally high extent, as when the dust bag of the vacuum cleaner becomes clogged with dust and dirt, the partial vacuum or suction pressure produced in the air flow path of the nozzle can become too small to efiect movement of the brush between its upper and lower positionsin the nozzle. Under these conditions the brush may not be moved from its lower to its upper position and will remain in an operative position when a porous object like a carpet, for example, is being vacuumed. If
  • the suction producing ability of the vacuum cleaner should become excessive, the partial vacuum produced in the air flow path of the nozzle can become too great and may effect movement of the brush from its lower to its upper position when a smooth object like a floor, for example, is being vacuumed.
  • This invention relates to a multi-purpose vacuum cleaner nozzle which is characterized by the absence of springs and spring biasing means and has two operating surfaces available and each one of which automatically becomes operable to perform a specific kind of cleaning depending upon the physical characteristics of the object to be cleaned.
  • the nozzle has a suction inlet which is primarily suitable to remove dirt from a porous object like a rug.
  • a brush is mounted on the nozzle at the vicinity of the suction inlet for movement between upper and lower positions, the brush in its lower position being below the suction inlet and operable to remove dirt from a non-porous object like a floor.
  • the suction inlet becomes operable to remove dirt from a porous object when the brush is in its upper position above the suction inlet.
  • structure for producing a variable pneumatic force which is directed upward or downward depending upon the rate at which air at a partial vacuum flows per unit interval of time in a path of flow from the suction inlet to an air outlet socket.
  • the force producing structure is operatively associated with the brush so that the brush will assume a multiplicity of positions, including its upper and lower positions, depending upon the rate at which air at a partial vacuum flows in the path of flow per unit interval of time.
  • variable force producing structure comprises a movable member, such as a flexible diaphragm, which is arranged to be influenced on one side by air at a partial vacuum at a first region of the path of flow and on the other side by air at a different partial vacuum at a second region of the path of flow removed lengthwise thereof from the first region.
  • the force producing structure is characterized by the absence of springs and spring biasing means.
  • FIG. 1 is a fragmentary vertical sectional view of a multi-purpose vacuum cleaner nozzle embodying the I invention with the brush illustrated in its lower position and operative to perform cleaning;
  • FIG. 2 is a sectional view taken at line 2-2 of FIG. 1 with the brush illustrated in its upper position and inoperative to perform cleaning;
  • FIG. 3 is a fragmentary sectional view taken at line 3-3 of I FIG. 1 illustrating the brush in its lower position and operative to perform cleaning.
  • the multi-purpose vacuum cleaner nozzle embodying the invention comprises an elongated hollow body 10 which comprises top and bottom parts 11 and 12 and a horizontal intermediate wall part 14 therebetween.
  • the parts ll, 12 and 14 are detachably connected together in any suitable manner (not shown).
  • the hollow body 10 is provided with an upwardly inclined tubular member 15.
  • the tubular member 15 serves as an outlet socket adapted to be connected to a source of air at a partial vacuum, such as a suction cleaner, for example.
  • the outlet socket 15 forms part of a passageway 16 through which air is drawn from an elongated air inlet 17 at the bottom of the nozzle.
  • the air inlet 17, which may be referred to as a suction inlet, comprises a plurality of open grooves 17a which are adjacent to one another and formed by spaced vertical ribs 12a in the central portion of the bottom body part 12.
  • An apertured bottom plate 18 overlies the bottom body part 12 at the lower open ends of the grooves 17a to provide a smooth gliding surface when a porous object like a carpet or rug, for example, is being cleaned.
  • the top, bottom and intermediate body parts 11, 12 and 14 are formed with interior vertical walls 19, 20 and 21 which cooperate with one another to provide the portion 16a of the passageway which extends vertically upward from the suction inlet 17.
  • the top nozzle part 11 and air outlet socket have walls 11a, 11b, 11c, 15a and 1511 which cooperate with one another to provide the portion 16b of the passageway which is at an acute angleto the horizontal and is in communication with the upper end of the portion 16a of the passageway.
  • a pair of elongated brushes 22 are provided at opposing sides of the suction inlet opening 17.
  • Each brush includes a row of bristles 22a fixed to a brush back 22b which is of inverted U-shape.
  • the brush backs 22b are united to and form unitary parts of an apertured plate 23 serving as a carrier for the brushes 22.
  • the carrier 23 is movable between raised and lower positions, as seen in solid and dotted lines in FIG. 2.
  • the carrier has an opening defined by an inner edge 23a, the opposing longitudinal portions of which move vertically at .the outer faces of the interior longitudinal walls of the hollow body 10.
  • the brush carrier 23 is fixed to a diaphragm 24 which is movable between upper and lower positions illustrated in F I08. 2 and 3, respectively, in a manner that will be explained presently.
  • the carrier 23 is provided with upstanding lugs 25 which pass through openings in the diaphragm 24, the enlarged upper ends of the lugs bearing against a force distributing sheet 26 overlying the top surface of the diaphragm.
  • the brushes 22 When, the diaphragm 24.is in its upper position shown in FIG. 2 the brushes 22 are disposed in bottom space or chamber 43 at the underside of the diaphragm.
  • the brushes 22 When the diaphragm 24 is in its lower position shown in FIG. 3, the brushes 22 extend downward through elongated openings 28 in the bottom body part 12, as seen in dotted lines in FIG. 2, with the lower ends or tips of the bristles 22a adapted to rest on an essentially smooth surface to becleaned, such as a floor, for example.
  • Rollers 29 are mounted for rotation on the body 10 at 30, as shown in FIG. 1, to support the nozzle on a surface to be cleaned.
  • I provide means, characterized by the absence of springs or spring biasing means, for producing a variable pneumatic force which is directed upward or downward depending upon the rate at which air at a partial vacuum flows in the passageway or path of flow 16 per unit interval of time.
  • the variable force producing means is operatively connected to the diaphragm 24 and brushes 22 movable therewith so that the brushes will assume a multiplicity of positions, including their upper and lower positions, depending upon the rate at which air at a partial vacuum flows in the path of flow 16 per unit interval of time.
  • the force producing means which constitutes an important feature of my invention, comprises a second diaphragm 31 which is disposed above the intermediate body wall 14.
  • the second diaphragm 31 is connected by a force transmitting member 32 to the diaphragm 24 which is disposed below the intermediate body wall 14.
  • the member 32 extends through an opening in the intermediate wall 14 and is connected at its lower end at 33 to the sheet 26.
  • the upper end of the member 32' is connected at 34 to a plate 35 which overlies the top surfaceof the diaphragm 31.
  • the plate 35 is fixed to the diaphragm 31 by lugs 32 which pass through openings in the diaphragm, the enlarged lower ends of the lugs bearing against a sheet 36 bearing against the bottom surface of the diaphragm.
  • the peripheral edge portions of the diaphragms 24 and 31 are clamped between theabutting outer edges of the body parts 11, 12 and 14 and form an enlarged head 37 which serves as a bumper to protect objects against which the nozzle may strike when being moved back and forth over a surface being cleaned.
  • the diaphragms 24 and 31 desirably are formed of a suitable elastomeric material like rubber, for example. Interior portions of the diaphragms 24 and 31 also are clamped between adjacent regions of the body parts ll, 12 and 14 or bear and are held against regions of the body parts, as seen in FIGS. 1 and 2.
  • the diaphragms 24 and 31 are provided with corrugated sections 38 and 39 to enhance their flexibility.
  • the diaphragm 31 divides the space between the nozzle body parts 11 and 14 into chambers 40 and 41 and the diaphragm 24 divides the space between the nozzle body parts 12 and 14 into chambers 42 and 43.
  • the air in chamber 43 below the diaphragm 24, by reason of the openings 28, is ambient air at atmospheric pressure.
  • the interior walls of the body 10 are provided with openings 44, 45, 46, 47 and 48 which selectively function to maintain the air in chambers 40, 41 and 42 at different partial vacuums.
  • the chamberv 42 above the diaphragm 24 is in communication with the portion 16a of the passageway 16 through the openings 44 and 45 in the interior walls of the body parts.
  • the chamber 40 above the diaphragm 31 also is in communication with the portion 16a of the passageway 16 through the openings 44, 46 and 47.
  • the chamber 41 below the diaphragm 31, on the other hand, is in communication with the portion 16b of. the passageway 16 through the opening 48 in the interior wall of the top body part 11, as seen in FIG. 2.
  • the partial vacuum at the opening 48 in the portion 16b of the passageway 16 will be greater than that at theopenings 44 in the portion 16a of the'passageway by reason of the pressure drop lengthwise of the passageway 16 between the regions at which the openings 44 and 48 are located.
  • a constriction 49 in the passageway. 16 at the juncture of the passageway portions 16aand 16b the pressure differential between the partial vacuums at the regions of the openings 48 and 44 can be increased.
  • the bottom side of the diaphragm 24' will be influenced by ambient air in chamber 43 which is at atmospheric pressure and the top side thereof, which is in communication with the passageway portion 16a through the openings 45 and 44, will be at a partial vacuum. Hence, the diaphragm 24 will be acted upon by a resultant force which always is directed upward.
  • the magnitude of the partial vacuum at the openings 44 in the passageway portion 16a will be relatively small. This means that the resultant force acting upward on the diaphragm 24 also will be relatively small. But under these operating conditions the rate at which air flows through the passageway 16 per unit interval of time will be very high which means that the pressure differential between the openings 48 and 44 also will be relatively high. When this occurs the resultant downward directed pneumatic force acting on the diaphragm 31 will be very great and this downward directed force will predominate and force the diaphragm downward. This force will be transmitted by the member 32 to the diaphragm 24 and move it downward.
  • the magnitude of the partial vacuum at the openings 44 in the passageway portion 16a will be relatively high.
  • the partial vacuum of air in the chamber 40 above the diaphragm 31 and in the chamber 42 above the diaphragm 24, both of which are in communication with the openings 44 also will be relatively high.
  • the rate at which air flows through the passageway 16 per unit interval of time will be relatively low which means that the pressure differential between the openings 48 and 44 also will be relatively low.
  • the resultant downward directed pneumatic force acting on the diaphragm 31 will be relatively small. This means that the resultant force acting upward on the diaphragm 24 will predominate and force it upward and move the brushes 22 to their raised position above the suction inlet 17.
  • the vacuum producing ability of the vacuum cleaner connected to the nozzle can vary within relatively wide limits.
  • Another advantage realized by the nozzle described above is that it can be employed with a variety of different vacuum cleaners and will always function with certainty in the manner described above.
  • a multi-purpose vacuum cleaner nozzle comprising a hollow body having vertically disposed wall means which forms a downward extending passageway and terminates in an opening defining a suction inlet, said body also having an air outlet socket adapted to be connected to a source of supply of air at a partial vacuum and means providing a path of flow for air between the suction inlet and outlet socket,
  • variable force producing means being operatively connected to said brush means mounting structure so the brush means assumes a multiplicity of positions including its upper and lower positions depending upon the rate at which air at a partial vacuum flows in said path of flow per unit interval of time, and
  • the tips of said bristles being at a level above that of said suction inlet when said brush means is in its upper position on said hollow body and at a level below that of said suction inlet when said brush means is in its lower position on said hollow body.
  • variable pneumatic force producing means produces a force which is directed upward when the rate at which air flows in said path of flow per unit interval of time is at or less than a predetermined value and produces a force which is directed downward when the rate at which air flows in said path of flow per unit interval of time exceeds the predetermined value.
  • variable pneumatic force producing means comprises a movable member arranged to be influenced on'one side by air at a partial vacuum at a first region in said path of flow and on the other side by air at a different partial vacuum at a second region of said path of flow removed lengthwise thereof from said first region.
  • a vacuum cleaner nozzle as set forth in claim 4 which comprises means including said body providing first and second spaces above and below said first movable member and a third space above said second movable member, said first space being on said one side of said first movable member and said second space being on said other side thereof, and
  • said third space on the upper side of said second movable member being arranged to be influenced by air at the second partial vacuum at the second region in said path of flow.
  • a vacuum cleaner nozzle as set forth in claim 5 in which the partial vacuum of air at the first region in said path of flow is greater than the partial vacuum of air at the second region in said path of flow.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Nozzles For Electric Vacuum Cleaners (AREA)
US92695A 1969-11-28 1970-11-25 Multi-purpose vacuum cleaner nozzle Expired - Lifetime US3659312A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE16382/69A SE328678B (da) 1969-11-28 1969-11-28

Publications (1)

Publication Number Publication Date
US3659312A true US3659312A (en) 1972-05-02

Family

ID=20302157

Family Applications (1)

Application Number Title Priority Date Filing Date
US92695A Expired - Lifetime US3659312A (en) 1969-11-28 1970-11-25 Multi-purpose vacuum cleaner nozzle

Country Status (12)

Country Link
US (1) US3659312A (da)
JP (1) JPS5239263B1 (da)
BR (1) BR7023927D0 (da)
CA (1) CA920309A (da)
CH (1) CH516302A (da)
DE (1) DE2055351C3 (da)
DK (1) DK124658B (da)
FR (1) FR2068700B1 (da)
GB (1) GB1315024A (da)
NL (1) NL7017030A (da)
SE (1) SE328678B (da)
ZA (1) ZA707724B (da)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3768114A (en) * 1970-09-09 1973-10-30 Electrolux Ab Combination rug and floor vacuum cleaner nozzle
US3798704A (en) * 1971-02-26 1974-03-26 Electrolux Ab Self-acting combination rug and floor vacuum cleaner nozzle
US3913168A (en) * 1972-11-22 1975-10-21 Electrolux Ab Multi-purpose vacuum cleaner nozzle
US5553349A (en) * 1994-02-21 1996-09-10 Aktiebolaget Electrolux Vacuum cleaner nozzle
EP0820717A2 (de) * 1996-07-26 1998-01-28 Wessel-Werk Gmbh Saugkopf an einem Staubsauger
US6123779A (en) * 1999-06-01 2000-09-26 Fantom Technologies Inc. Pressure based sensing means for adjusting the height of an agitator in a vacuum cleaner head
US20100229339A1 (en) * 2009-03-12 2010-09-16 Dyson Technology Limited Surface treating head
US20100319159A1 (en) * 2009-06-17 2010-12-23 Dyson Technology Limited Tool for a surface treating appliance
WO2011007160A1 (en) * 2009-07-16 2011-01-20 Dyson Technology Limited A surface treating head
WO2011007159A1 (en) * 2009-07-16 2011-01-20 Dyson Technology Limited A surface treating head
WO2011007158A1 (en) * 2009-07-16 2011-01-20 Dyson Technology Limited A surface treating head

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE394942B (sv) * 1975-11-06 1977-07-25 Electrolux Ab Anordning vid ett dammsugningsmunstycke
FR2543425B1 (fr) * 1983-03-29 1987-03-20 Olivier Ets Georges Suceur perfectionne pour aspirateur de poussieres

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2688763A (en) * 1948-08-24 1954-09-14 George P Pfaffle Suction head for vacuum cleaners
US3497903A (en) * 1966-11-28 1970-03-03 Electrolux Ab Self-adjusting multipurpose nozzle
US3599271A (en) * 1969-02-04 1971-08-17 Electrolux Ab Multipurpose vacuum cleaner nozzle

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1545346A (fr) * 1966-11-28 1968-11-08 Electrolux Ab Accessoire pour aspirateurs
SE334716B (da) * 1969-02-06 1971-05-03 Electrolux Ab

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2688763A (en) * 1948-08-24 1954-09-14 George P Pfaffle Suction head for vacuum cleaners
US3497903A (en) * 1966-11-28 1970-03-03 Electrolux Ab Self-adjusting multipurpose nozzle
US3599271A (en) * 1969-02-04 1971-08-17 Electrolux Ab Multipurpose vacuum cleaner nozzle

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3768114A (en) * 1970-09-09 1973-10-30 Electrolux Ab Combination rug and floor vacuum cleaner nozzle
US3798704A (en) * 1971-02-26 1974-03-26 Electrolux Ab Self-acting combination rug and floor vacuum cleaner nozzle
US3913168A (en) * 1972-11-22 1975-10-21 Electrolux Ab Multi-purpose vacuum cleaner nozzle
US5553349A (en) * 1994-02-21 1996-09-10 Aktiebolaget Electrolux Vacuum cleaner nozzle
EP0820717A2 (de) * 1996-07-26 1998-01-28 Wessel-Werk Gmbh Saugkopf an einem Staubsauger
EP0820717A3 (de) * 1996-07-26 1999-05-12 Wessel-Werk Gmbh Saugkopf an einem Staubsauger
US6123779A (en) * 1999-06-01 2000-09-26 Fantom Technologies Inc. Pressure based sensing means for adjusting the height of an agitator in a vacuum cleaner head
US20100229339A1 (en) * 2009-03-12 2010-09-16 Dyson Technology Limited Surface treating head
US8544145B2 (en) 2009-03-12 2013-10-01 Dyson Technology Limited Surface treating head
US20110010889A1 (en) * 2009-03-12 2011-01-20 Dyson Technology Limited Surface treating head
US8468647B2 (en) 2009-03-12 2013-06-25 Dyson Technology Limited Surface treating head
US20100319159A1 (en) * 2009-06-17 2010-12-23 Dyson Technology Limited Tool for a surface treating appliance
US8424157B2 (en) 2009-06-17 2013-04-23 Dyson Technology Limited Tool for a surface treating appliance
WO2011007159A1 (en) * 2009-07-16 2011-01-20 Dyson Technology Limited A surface treating head
US20110010886A1 (en) * 2009-07-16 2011-01-20 Dyson Technology Limited Surface treating head
CN101953665A (zh) * 2009-07-16 2011-01-26 戴森技术有限公司 表面处理头
US8387206B2 (en) 2009-07-16 2013-03-05 Dyson Technology Limited Surface treating head
US8387207B2 (en) 2009-07-16 2013-03-05 Dyson Technology Limited Surface treating head
CN101953665B (zh) * 2009-07-16 2013-03-27 戴森技术有限公司 表面处理头
US20110010890A1 (en) * 2009-07-16 2011-01-20 Dyson Technology Limited Surface treating head
WO2011007158A1 (en) * 2009-07-16 2011-01-20 Dyson Technology Limited A surface treating head
WO2011007160A1 (en) * 2009-07-16 2011-01-20 Dyson Technology Limited A surface treating head

Also Published As

Publication number Publication date
CH516302A (de) 1971-12-15
JPS5239263B1 (da) 1977-10-04
CA920309A (en) 1973-02-06
NL7017030A (da) 1971-06-02
DE2055351B2 (de) 1978-04-13
BR7023927D0 (pt) 1973-02-08
DE2055351C3 (de) 1978-12-07
FR2068700A1 (da) 1971-08-27
ZA707724B (en) 1971-08-25
GB1315024A (en) 1973-04-26
DK124658B (da) 1972-11-13
SE328678B (da) 1970-09-21
FR2068700B1 (da) 1974-02-15
DE2055351A1 (de) 1971-06-09

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