US3201079A - Adjusting device - Google Patents

Adjusting device Download PDF

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Publication number
US3201079A
US3201079A US239251A US23925162A US3201079A US 3201079 A US3201079 A US 3201079A US 239251 A US239251 A US 239251A US 23925162 A US23925162 A US 23925162A US 3201079 A US3201079 A US 3201079A
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United States
Prior art keywords
tubes
reservoir
tube
gas
piston
Prior art date
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Expired - Lifetime
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US239251A
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English (en)
Inventor
Doetsch Hans Peter
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Individual
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Individual
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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C3/00—Chairs characterised by structural features; Chairs or stools with rotatable or vertically-adjustable seats
    • A47C3/20—Chairs or stools with vertically-adjustable seats
    • A47C3/22—Chairs or stools with vertically-adjustable seats with balancing device, e.g. by spring, by weight
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C3/00—Chairs characterised by structural features; Chairs or stools with rotatable or vertically-adjustable seats
    • A47C3/20—Chairs or stools with vertically-adjustable seats
    • A47C3/28—Chairs or stools with vertically-adjustable seats with clamps acting on vertical rods
    • A47C3/285—Chairs or stools with vertically-adjustable seats with clamps acting on vertical rods with radially expansible clamping elements telescopically engaged in a tube or the like
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C3/00—Chairs characterised by structural features; Chairs or stools with rotatable or vertically-adjustable seats
    • A47C3/20—Chairs or stools with vertically-adjustable seats
    • A47C3/30—Chairs or stools with vertically-adjustable seats with vertically-acting fluid cylinder
    • 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
    • F16B7/10—Telescoping systems
    • F16B7/105—Telescoping systems locking in discrete positions, e.g. in extreme extended position
    • 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
    • F16B7/10—Telescoping systems
    • F16B7/14—Telescoping systems locking in intermediate non-discrete positions
    • F16B7/1409—Telescoping systems locking in intermediate non-discrete positions with balls or rollers urged by an axial displacement of a wedge or a conical member
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D41/00—Freewheels or freewheel clutches
    • F16D41/06—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface
    • F16D41/08—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface with provision for altering the freewheeling 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/02—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum
    • F16F9/0209—Telescopic
    • F16F9/0245—Means for adjusting the length of, or for locking, the spring or dampers

Definitions

  • the invention relates to an adjusting device for adjusting the relative position of any two objects and provided with an energy reservoir. It is important with such adjusting devices for the displacement force exerted by the energy reservoir to be substantially constant in all positions.
  • a reservoir filled with a highly compressed gas is mounted between the two objects to be adjusted, and has a piston which is acted on by the gas pressure and of which the movements are preferably damped, the piston being lockable in any position and its output force being substantially constant in all positions.
  • the reservoir it is an advantage for the reservoir to be arranged in two tubes which are relatively displaceable in telescopic fashion, he end of the piston which projects from the reservoir being fixed to the base of one tube and the reservoir itself being mounted in the second tube for limited axial displacement.
  • the telescopic tube of smaller diameter has longitudinal slots at the end projecting into the other tube.
  • the reservoir has afrustum, of which the diameter is chosen sothat enough space is left between the outer surface of the frustum and the inner surface of the slotted telescopic tube for wedges to be accommodated, the wedges being pressed into the narrowing space between the frustum and the telescopic tubeeither by gravity or, if necessary, by spring force.
  • the reservoir By means of a lever mechanism at the opposite end of the telescopic tube, the reservoir can be moved in anaxial direction so that the wedges penetrate still further into the narrowing space between the frustum and the slotted tube, thus pressing the slotted tube fast against the inner wall of the second telescopic tube.
  • a positive connection is formed between the two telescopic tubes, is. they are secured in their relative positions. All that is required to release the connection is for the lever mechanism to be moved in the opposite direction to that used for securing.
  • a further construction of the invention provides for the wedges to be mounted in an axially movable guide which does not prevent them from moving radially but which keeps them in the same radial plane in every position.
  • the guide it is desirable for the guide to be provided with a thin- .walled cylindrical projection, the diameter of which is chosen so that its outer surface slidesalong the inner surface of the telescopic tube surrounding it or so that its inner surface slides along the outer surface of the reservoir. This ensures that there are no bending moments in the region of the wedging device, due to the wedges be- 3,201,079" Patented Aug. 17, .1965
  • one of the tubes In order to improve the positive connection between the two telescopic tubes it is desirable for one of the tubes to be made of hard and the other of comparatively soft material or, if for any reason both tubes have to be made of the same type of material, for one tube to be coated with softer material on the surface which forms a positive connection with the other tube.
  • FIG. 1 is a section through a chair frame employing an adjusting device accordingto the invention.
  • FIG. 2 is a perspective View of a slightly modified form of the wedging device shown in H6. 1 in section.
  • the tube 1 which is closed at one end and rigidly connected to the legs 13 of the chair, receives the tube.2, which is movable in telescopic fashion relatively thereto and which accommodates the reservoir 3 filled with a highly compressed gas.
  • One end of a piston rod 4 is fixed to the base of the tube 1, and the other end, which is inserted in the reservoir 3 in a gas-tight manner, carries a damping piston 14..
  • a damping piston 14 Associated with the damping piston 14 is a damping cylinder 15 with a floating piston 15, so that a space 17 is formed which is sealed off from the gas and filled with damping. fluid.
  • the damping fluid can however be dispensed with and the piston 14 braked directly by the gas.
  • clamping piston as used herein means a piston which has a bleed passage therethrough or which is a loose fit inits cylinder. 1
  • the reservoir 3 On the same side as that on which the piston rod 4 is inserted, the reservoir 3 carries afrustum 7, its dimensions being chosen so that a tapering annular space is formed between the outer surface of the frustum and the inner surface of the tube 2. to receive wedges 6.
  • the tube 2 has one or more longitudinal slots 5 in the region of the frustum 7 to facilitate its deformation.
  • the tube 2 At the opposite end the tube 2 carries a rotary bearing 18 which is rigidly connected to the seat plate 19 of the chair.
  • the output force of the reservoir 3 is about 40 kg., so that a person using the chair can lower the seat plate by his own weight when the lock is released, and all that isrequired to adjust the height of the seat 1 plate is to relieve it of the load.
  • the actuating lever 23 is merely pressed downwardly, whereby the reservoir 3 is moved axially relatively to the telescopic tube 2.
  • This displacment moves the wedges 6 into the narrowing space between the frustum 7 and the inner surface of the tube 2, so that the latter is pressed firmly against the telescopic tube 1.
  • a positive connection is formed between the two, telescopic tubes 1 and 2, which can be released only by movement of the reservoir 3 in the opposite direction, i.e. by moving the actuating lever 23 upwardly.
  • a thin-walled cylindrical projection 9 is provided on the guide 8, its diameter being chosen so that the projection slides either along the outer surface of the reservoir 3 or along the inner surface of the tube 2.
  • a compression spring 12 is mounted between the end surface 10 of the reservoir 3 and the annular surface 11 of the guide 8.
  • An adjusting device for adjusting the relative position of two objects which comprises two tubes telescopically slidable one within the other, a gas reservoir filled with a highly compressed gas and mounted within one of said tubes so as to be capable of limited axial displacement relatively thereto, piston means fixed longitudinally within the other of said tubes, and arranged to compress the gas in said reservoir when said tubes are telescoped and means for locking said tubes relatively to each other, said means being operable by axially displacing said reservoir slightly with respect to said one tube.
  • said locking means comprises at least one wedge member disposed within said inner tube adjacent its inner end and tapered'means operatively connected to said reservoir whereby slight axial displacement of said reservoir relative to said inner tube can force said wedge member radially outwardly, thereby elastically deforming said inner tube and jamming it against the inner surface of the outer of said two tubes.
  • a device wherein the reservoir .is arranged in two tubes which are relatively displaceable in telescopic fashion, the end of the piston which projects from the reservoir being fixed to the base of the tube and the reservoir itself being mounted in the tube for limited axial displacement.
  • a device wherein, on the side of the reservoir where the piston isinserted in a gas-tight manner a frustum is mounted coaxially with its smaller diameter towards the reservoir.
  • a device wherein the tube has one or more longitudinal slots in the region of the frustum.
  • a device according to claim 7 wherein wedges are arranged in the narrowing annular space between the frustum and the inner wall of the tube.
  • a device wherein a two-armed lever is used to actuate the wedging device, one arm engaging the annular groove in the reservoir and the other arm being designed as an actuating lever.
  • a device wherein either the inner surface of the tube or the outer surface of the tube is coated with a material which is less hard than the material from which the tube is made.
  • a device which includes an axially movable guide in said inner tube adjacent its inner end and. carrying a plurality of wedge members, said gpide maintaining said wedge members in the same radial p ane.
  • a device which includes a compression spring mounted between said reservoir and said guide.
  • An adjusting device for adjusting the relative positions of two objects which comprises two tubes telescopically slidable one within the other, a gas reservoir filled with highly compressed gas and mounted within at least one of said tubes, a cylinder disposed in one of said tubes and in communication with said reservoir, a piston which is slidable in said cylinder between two extreme working positions and which is acted on by the gas pressure in the cylinder, said cylinder being operatively connected to one of said tubes and said piston being operatively connected to the other of said tubes whereby the gas in said reservoir tends to extend the device and whereby said piston further compresses said gas when said tubes are telescoped, the pressure of the gas in the reservoir, the volume of the reservoir and the area of the piston being such that the force applied to said piston is substantially constant throughout the whole extension range between said two extreme working positions.
  • a device wherein said locking means is adapted to elastically locally deform one of said tubes in a portion thereof which overlaps the other of said tubes.
  • An adjusting device for adjusting the relative position of two objects which comprises two tubes telescopically slidable one within the other between two extreme working positions, a gas reservoir filled with highly compressed gas and mounted within one of said tubes, piston means fixed longitudinally within the other of said tubes and arranged to further compress the gas in said reservoir when said tubes are telescoped, and means for locking said tubes relatively to each other, the pressure of the gas in the reservoir, the volume of the reservoir and the area of the piston means being such that the force applied by said gas to said piston means is substantially constant over the whole extension range of the device between said two extreme working positions, said locking means being adapted to elastically locally deform one of said tubes in a portion thereof which overlaps the other of said tubes.
  • a chair frame comprising a seat member, a base member, and adjusting means for raising and lowering said seat member relatively to said base member, said adjusting means comprising two tubes telescopically slidable one within the other between two extreme working positions, one of said tubes being connected to said seat member and the other of said tubes being connected to said base member, a gas reservoir filled with highly compressed gas and mounted within one of said tubes, piston means fixed longitudinally within the other of said tubes and arranged to further compress the gas in said reservoir when said tubes are telescoped, and means for locking said tubes relatively to each other, the pressure of the gas in the reservoir, the volume of the reservoir and the area of the piston means being such that the force applied by said gas to said piston means is substantially constant over the whole extension range of the device between said two extreme working positions.
  • a chair frame comprising a seat member, a base member and adjusting means for adjusting the height of said seat member relatively to said base member, said adjusting means comprising two tubes telescopically slidable one within the other, one of said tubes being connected to said seat member and the other of said tubes being connected to said base member, a gas reservoir filled with highly compressed gas and mounted within at least one of said tubes, a cylinder disposed in one of said tubes and in communication with said reservoir, a piston which is slidable in said cylinder between two extreme working positions and which is acted on by the gas pressure in the cylinder, said cylinder being operatively connected to one of said tubes and said cylinder being operatively.
  • a chair frame comprising a seat member, a base member and adjusting means for adjusting the height of said seat member relatively to said base member, said adjusting means comprising two tubes telescopically slidable one with the other, one of said tubes being connected to said seat member and the other of said tubes being connected to said base member, a gas reservoir filled with a highly compressed gas and mounted within one of said tubes so as to be capable of limited axial displacement relatively thereto, piston means fixed longitudinally within the other of said tubes and arranged to further compress the gas in said reservoir when said tubes are telescoped and means for locking said tubes relatively to each other, said locking means being operable by axially displacing said reservoir slightly with respect to said one tube.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chairs Characterized By Structure (AREA)
  • Prostheses (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Actuator (AREA)
US239251A 1961-11-27 1962-11-21 Adjusting device Expired - Lifetime US3201079A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DED37544A DE1208557B (de) 1961-11-27 1961-11-27 Loesbare Verbindung zweier teleskopartig ineinandergreifender, kraftbelasteter, hohler Stangen zur Laengenverstellung der Gesamtkonstruktion
DED40167A DE1212357B (de) 1961-11-27 1962-10-30 Loesbare Verbindung zweier teleskopartig ineinandergreifender, kraftbelasteter, hohler Stangen zur Laengsverstellung der Gesamtkonstruktion

Publications (1)

Publication Number Publication Date
US3201079A true US3201079A (en) 1965-08-17

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ID=25971344

Family Applications (1)

Application Number Title Priority Date Filing Date
US239251A Expired - Lifetime US3201079A (en) 1961-11-27 1962-11-21 Adjusting device

Country Status (10)

Country Link
US (1) US3201079A (fr)
BE (1) BE625327A (fr)
CH (1) CH422527A (fr)
DE (2) DE1208557B (fr)
DK (1) DK108515C (fr)
FR (1) FR1340505A (fr)
GB (1) GB1010458A (fr)
LU (1) LU42768A1 (fr)
NL (2) NL285895A (fr)
SE (1) SE311784B (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3506234A (en) * 1966-02-08 1970-04-14 Kurt Roder Vertically adjustable column,particularly for swivel chairs
US3788587A (en) * 1971-12-23 1974-01-29 Stabilus Ind Handels Gmbh Resilient column
US3861740A (en) * 1973-06-18 1975-01-21 Showa Mfg Saddle position adjusting device for a vehicle such as bicycle
US3891271A (en) * 1972-01-11 1975-06-24 Ferodo Sa Safety belt system
US3990668A (en) * 1976-01-15 1976-11-09 Deere & Company Hydraulic suspension seat assembly
US4076201A (en) * 1977-02-10 1978-02-28 Hudnall Walter E Adjustable chair-spindle assembly
US4094484A (en) * 1976-03-13 1978-06-13 W. Vinten Limited Balanced portable pedestals
US4640484A (en) * 1985-05-06 1987-02-03 Fichtel & Sachs Industries Support column with gravity dependent retention means
US5106157A (en) * 1989-03-01 1992-04-21 Herman Miller, Inc. Chair height and tilt adjustment mechanisms
US5577807A (en) * 1994-06-09 1996-11-26 Steelcase Inc. Adjustable chair actuator
US20080296955A1 (en) * 2007-06-01 2008-12-04 Geister Jennifer K Height adjustable armrest
WO2015003502A1 (fr) * 2013-07-08 2015-01-15 韩涛 Appareil d'agrafage automatique et pièce de liaison

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1775404B1 (de) * 1968-08-07 1971-11-25 Erna Klever Fa Ausziehrohr,insbesondere fuer Stative oder dergleichen hoehenverstellbare Geraetestaender bzw.-halter
US3727872A (en) * 1970-06-15 1973-04-17 A Spieth Column of an office chair
DE2345503C2 (de) * 1973-09-08 1983-04-14 Stabilus Gmbh, 5400 Koblenz Ausstellvorrichtung für schwenkbare Klappen
SE380588B (sv) * 1973-12-21 1975-11-10 Foerenade Fabriksverken Arbetscylinder med i valfritt lege lasbar kolv
DE2416642C3 (de) * 1974-04-05 1981-04-23 Fried. Krupp Gmbh, 4300 Essen Vorrichtung zum Transport eines Lastkörpers in Tagebaubetrieben, insbesondere zum Rücken von Bandantriebsstationen
US4445660A (en) * 1982-04-09 1984-05-01 Karapita Alexander D Adjustable suspension support
DE3900687A1 (de) * 1989-01-12 1990-07-19 Peter Heckmann Feststelleinrichtung fuer ineinander verschiebbare teleskopbeine eines hoehenverstellbaren moebels
DE3934202A1 (de) * 1989-10-13 1991-04-18 Peter Heckmann Teleskopfuss fuer ein hoehenverstellbares moebel
DE19532510C2 (de) * 1995-09-02 2001-10-18 Mannesmann Sachs Ag Teleskopschwingungsdämpfer, insbesondere für Kraftfahrzeuge

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1859223A (en) * 1930-12-26 1932-05-17 American Model Form Co Inc Supporting stand

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DE260247C (fr) *
DE197189C (fr) *
DE67806C (de) * A. WAHL in München Kugeigesperre mit Klemmkegeln
CH87614A (fr) * 1919-12-15 1921-02-16 Matthey Arthur Support ajustable.
FR841932A (fr) * 1937-09-18 1939-06-01 Cie Britannique Arens Controls Perfectionnements apportés à la commande des dispositifs flexibles de transmissionde force
FR953409A (fr) * 1947-09-12 1949-12-06 Appareil télescopique à action hydro-pneumatique combinée, applicable en particulier aux amortisseurs, élévateurs ou autres
FR968231A (fr) * 1948-06-18 1950-11-22 Perfectionnements aux amortisseurs de suspension hydrauliques ou pneumatiques et auxsuspensions oléo-pneumatiques ou pneumatiques amorties
DE819634C (de) * 1950-05-13 1951-11-05 Boge & Sohn G M B H Fluessigkeits-Stossdaempfer, insbesondere fuer Strassen- und Schienen-fahrzeuge, mit einem mit Durchlassventilen fuer die Bremsfluessigkeit versehenen Kolben und einer luftgefuellten Ausgleichkammer
DE887132C (de) * 1950-09-23 1953-08-20 Jean Louis Gratzmuller Energiespeicher
DE924721C (de) * 1952-01-30 1955-03-07 Emil Goelz Teleskopartige Fuehrung
FR1076192A (fr) * 1953-02-13 1954-10-25 Blaw Knox Cie Fse Perfectionnements aux appareils à fluide tels que vérins, accumulateurs d'énergie, ou amortisseurs par exemple
DE1036485B (de) * 1954-02-18 1958-08-14 Holzwaren Und Tischfabrik G M Tisch mit in der Hoehe verstellbarer Tischplatte

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1859223A (en) * 1930-12-26 1932-05-17 American Model Form Co Inc Supporting stand

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3506234A (en) * 1966-02-08 1970-04-14 Kurt Roder Vertically adjustable column,particularly for swivel chairs
US3788587A (en) * 1971-12-23 1974-01-29 Stabilus Ind Handels Gmbh Resilient column
US3891271A (en) * 1972-01-11 1975-06-24 Ferodo Sa Safety belt system
US3861740A (en) * 1973-06-18 1975-01-21 Showa Mfg Saddle position adjusting device for a vehicle such as bicycle
US3990668A (en) * 1976-01-15 1976-11-09 Deere & Company Hydraulic suspension seat assembly
US4094484A (en) * 1976-03-13 1978-06-13 W. Vinten Limited Balanced portable pedestals
US4076201A (en) * 1977-02-10 1978-02-28 Hudnall Walter E Adjustable chair-spindle assembly
US4640484A (en) * 1985-05-06 1987-02-03 Fichtel & Sachs Industries Support column with gravity dependent retention means
US4684098A (en) * 1985-05-06 1987-08-04 Fichtel & Sachs Industries Support column with gravity retention means
US5106157A (en) * 1989-03-01 1992-04-21 Herman Miller, Inc. Chair height and tilt adjustment mechanisms
US5244253A (en) * 1989-03-01 1993-09-14 Herman Miller, Inc. Height adjustment control for a chair
US5577807A (en) * 1994-06-09 1996-11-26 Steelcase Inc. Adjustable chair actuator
US20080296955A1 (en) * 2007-06-01 2008-12-04 Geister Jennifer K Height adjustable armrest
US7841665B2 (en) 2007-06-01 2010-11-30 Steelcase Inc. Height adjustable armrest
WO2015003502A1 (fr) * 2013-07-08 2015-01-15 韩涛 Appareil d'agrafage automatique et pièce de liaison

Also Published As

Publication number Publication date
DK108515C (da) 1967-12-27
GB1010458A (en) 1965-11-17
BE625327A (fr) 1963-03-15
NL7100084A (fr) 1971-05-25
NL142061B (nl) 1974-05-15
NL285895A (fr) 1965-02-10
DE1212357B (de) 1966-03-10
CH422527A (de) 1966-10-15
DE1208557B (de) 1966-01-05
FR1340505A (fr) 1963-10-18
SE311784B (fr) 1969-06-23
LU42768A1 (fr) 1963-01-28

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