EP0056232A1 - Skistock, der in der Länge verstellbar ist - Google Patents

Skistock, der in der Länge verstellbar ist Download PDF

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Publication number
EP0056232A1
EP0056232A1 EP82100017A EP82100017A EP0056232A1 EP 0056232 A1 EP0056232 A1 EP 0056232A1 EP 82100017 A EP82100017 A EP 82100017A EP 82100017 A EP82100017 A EP 82100017A EP 0056232 A1 EP0056232 A1 EP 0056232A1
Authority
EP
European Patent Office
Prior art keywords
ski pole
bolt
actuating member
link
latch
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.)
Withdrawn
Application number
EP82100017A
Other languages
German (de)
English (en)
French (fr)
Inventor
Hans Weber-Henning
Peter Weber
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.)
WEBER HENNING HANS
Original Assignee
WEBER HENNING HANS
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 WEBER HENNING HANS filed Critical WEBER HENNING HANS
Publication of EP0056232A1 publication Critical patent/EP0056232A1/de
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63C—SKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
    • A63C11/00—Accessories for skiing or snowboarding
    • A63C11/22—Ski-sticks
    • A63C11/221—Ski-sticks telescopic, e.g. for varying the length or for damping shocks

Definitions

  • the invention relates to a ski pole, which is adjustable in length, with two telescopically displaceable tube sections, which can be fixed in their mutual position by a locking device, with an actuator on the ski pole handle for fixing the two tube sections or for releasing the fixing, the Actuator can be reached from the fingers of the hand holding the ski pole, the locking device being designed as a bolt with a plurality of bolt latches, and a spring supported on one end on the inner tube section and on the other end on the outer tube section, which tends to axially push both tube sections apart.
  • Such a ski pole can be used on the one hand as a rigid ski pole with an adjustable length and on the other hand as a resilient ski pole. This is particularly interesting for a cross-country pole, because on the one hand the stick length can be adapted to the terrain and on the other hand the spring force stored in the stick can be used as a feed aid.
  • Such a ski pole is known from NO-PS 73 712.
  • the latch consists of elastically radially expandable tongues which are actuated by the actuating member via an axial rod.
  • the bolt latches consist of circumferential grooves.
  • the actuator is designed as a push button. If the button is not pressed, the two pipe sections are locked together and there is a rigid ski pole with the length set in each case. As long as the button is pressed, the lock is released and there is a resilient ski pole.
  • the disadvantage of this ski pole is that when the ski pole is used as a resilient cross-country pole to use the stored spring force as a feed aid, the operating button must always be kept depressed.
  • the latch is not set to predetermined, e.g. can inevitably snap in two or three bolt latches if the ski pole is in motion, i.e. when resting on the ground, has reached the desired length.
  • the stick can be adjusted from a resilient stick to a rigid stick and vice versa, as well as the lengthening or shortening of the rigid stick should be able to be carried out while running without impairing the running rhythm.
  • the aim is to create a ski pole with which the aforementioned disadvantages can be avoided.
  • the ski pole according to the invention is characterized in that the locking latches are provided in a swivel cylinder which is provided with a link, the locking latches being part of the link, in that the pivot cylinder is pivotally mounted in the inner tube section and is connected to the actuating member in a movement-related manner.
  • the ski pole has an inner tube section 1, which carries the snow plate and the ski pole tip at the lower end, not shown. There is also an outer tube section 2, which extends only over approximately the length of the ski pole grip.
  • the ski pole grip comprises a shell consisting of a plastic material, which in practice is made of several parts, but in FIGS. 1 and 2 for reasons of clarity is shown in one piece. This plastic shell 3 is at least partially preferred with cross-country ski poles Suede covered, which is not shown in the drawing.
  • a bearing cap 4 is seated on the outer tube 2 and has an outer contour according to the line 5. 1 and 2, this bearing cap has cut surfaces 6. In the plan view of the ski pole according to FIG.
  • the bearing cap 4 has a U-shape, the two free leg ends then being on the right in the drawing. These two legs are each provided with a bearing bore for receiving a journal 7.
  • the bearing cap 4 is made of a plastic material, and a bearing plate 8 made of steel is pressed into this bearing cap.
  • the bearing cap 4 is provided with three locking grooves 9.
  • the bearing shell 3 carries a sealing ring 10 seated in a circumferential groove.
  • a clamping eccentric 11 which is mounted in a clamping bracket 12.
  • the screwing used to tension the clamping bracket 12 also serves at the same time for mounting the clamping eccentric 11.
  • the clamping eccentric 11 serves to hold the two band ends 13 and 14, which are present in a loop, not shown. This loop is available in a known manner with every ski pole handle.
  • the locking device of the ski pole with which the two mutually displaceable tube sections 1 and 2 can be fixed in their mutual position, is now explained below, this fixing then being able to be released again.
  • the inner tube section 1 carrying the ski pole tip and the snow plate has two mutually diametrically located bores, in which one as Bar-shaped bolt 15 is attached with its end portions 16 attached (Fig.2).
  • the rod 15 has two areas 17 which are provided with flat surfaces, since these areas 17 serve as sliding blocks in a manner explained later.
  • the rod is also provided with two ends 18, which are expediently also provided with two opposite guide surfaces.
  • the rod 15 also has a central region 19, on which the one end 20 of a helical tension spring 21 is supported.
  • the rod 15 thus sits in the pipe section 1 axially immovable and non-rotatable.
  • the rod 15 thus serves as a bolt of the locking device mentioned, the two sliding blocks 17 effecting the actual locking, which will be explained later.
  • the rod 15 lies within a swivel cylinder 22 which carries a bearing ball 23 at the top and a pressed-in bearing plate 24 made of a metal at the bottom.
  • the pivot cylinder 22 can consist of a plastic material.
  • This guide bush 26 is rotatably and displaceably seated in the inner tube section 1.
  • the lower end 27 of the spring 21 is supported on the guide bush 26.
  • the pivot cylinder 22 is hollow and is provided with the locking latches of the locking device mentioned.
  • the pivot cylinder 22 is provided with a link 28 or 29 which can be seen from FIGS. 4 and 6.
  • the backdrop 28 or 29 penetrates the hollow pivot cylinder 22 completely, so that the backdrop opens out diametrically opposite sides of the lateral surface of the swivel cylinder (Fig. 5,7).
  • the link 28 shown in FIG. 4 has two Z-shaped link sections which directly adjoin one another in the longitudinal extent of the swivel cylinder 22, so that three locking latches 30, 31 and 32 are formed.
  • the bolt latches 30-32 are therefore part of the backdrop 28.
  • middle parts 33 and 34 of the Z-shape each consisting of three parts 30, 31, 33 and 31, 32, 34, respectively. These middle parts 33 and 34 are inclined to the longitudinal axis of the pivot cylinder 22.
  • a Z-shaped link section is again provided with the latches 35 and 36 and a central part 37.
  • a straight link section 38 which runs parallel to the longitudinal axis of the pivot cylinder 22.
  • the bar 15 designed as a rod is guided with its two link blocks 17 in the link 28 or 29 which completely penetrates the pivot cylinder 22.
  • the two ends 18 of the bar 15 designed as a rod are guided in longitudinal slots 39 of the outer tube section 2, these longitudinal slots 39 running parallel to the longitudinal axis of the pivot cylinder 22. Since the swivel cylinder 22 is coaxial to the two pipe sections 1 and 2, these longitudinal slots 39 also run parallel to the longitudinal axis of the pipe sections 1 and 2.
  • the pivot cylinder 22 can be pivoted relative to the two pipe sections 1 and 2 by a limited angle of rotation.
  • the pivot cylinder 22 is with a provided eccentric articulation point 40, which is designed as a pin which lies outside the longitudinal axis of the pivot cylinder 22.
  • a force is applied transversely to the pin 40, the pivot cylinder 22 is rotated back and forth by a limited angle of rotation, that is to say pivoted.
  • An actuator 41 is pivotally mounted on the journal 7 of the bearing cap 4.
  • the actuator 41 is designed as a two-armed rocker arm.
  • One arm of the actuator 41 is provided with a link 42 for a linkage 43.
  • the other arm of the actuator 41 is provided with a wart-like projection 44 which cooperates with the locking grooves 9 and results in a snap-like locking with these.
  • Such a position of the actuator 41 is shown in FIG. 1. In the other two possible positions of the actuating member 41, the articulation point 42 is in the position 42 'or 42 ".
  • the actuating member 41 is connected in motion to the pivot cylinder 22 via the linkage 43.
  • the linkage 43 is designed as a U-shaped leaf spring, the one free leaf spring leg 45 is supported on the actuating member 41 and the other free leaf spring leg 46 is supported on the eccentric articulation point 40 of the swivel cylinder 22 (FIG. 3), and FIGS 3, the articulation point 42 is in the position 42 'shown in Fig. 1.
  • the pin 40 can take two positions 40' and 40 "in addition to the middle position shown. In the position of the actuating member 41 shown in FIG the pin shown in Fig. 3 is in the position 40 '. If the actuating member 41 were in its central position in FIG.
  • the actuating member 41 is located on the side of the ski pole grip facing away from the loop bands 13 and 14. Since the loop straps 13 and 14 face the skier, the actuating member 41 is therefore on the back of the ski pole grip. From Fig. 1 it can be seen that the actuator 41 projects beyond an immovable part of the ski pole grip, namely the grip shell 3. The actuating member 41 lies in the upper region of the ski pole grip, so that the actuating member 41 lies in the region of engagement of the index finger of a hand carrying the ski pole.
  • the pivot cylinder 22 shown in FIGS. 1 and 2 should have the backdrop 28 shown in FIGS. 4 and 5.
  • This link 28 thus has the three latch latches 30, 31 and 32.
  • the latch latch 30 and the central part 33 of the link 28 are indicated in FIG. 1.
  • the ski pole can be set to three lengths, the bolt 15 being located in the bolt latch 30 shown in FIGS. 1, 2 and 4 in the shortest ski pole length.
  • the helical tension spring 21 is most tensioned at this shortest length of ski pole, ie most pulled apart.
  • the outer tube section 2 carrying the ski material grip is pushed the most over the inner tube section 1 at the shortest length of the ski pole and is located 1 in its lowest position with respect to the inner tube section 1.
  • the actuator 41 is pressed inwards at the bottom. If the ski pole is now to assume its medium length, the actuating member 41 is brought into its central position. As a result, the pivot cylinder 22 is rotated somewhat, so that the pin 40 in FIG. 1 comes to lie in the longitudinal axis of the pivot cylinder 22, as can be seen from FIG. 3. As a result of this rotation of the pivot cylinder 22, the bolt 15 has come out of the horizontal part 30 (bolt latch) and is located in the middle part 33 of the backdrop. As a result, the tension spring 21 can be effective, contracts somewhat, as a result of which, in FIG.
  • the pivot cylinder 22 with the components connected to it that is to say the ski pole handle, are moved upward relative to the inner tube section 1 until the latch 15 in the latch 31 shown in FIG. 4 snaps into place.
  • This snap-like engagement of the bolt 15 into the bolt latch 31 is achieved by the course of the central part 33 of the link 28, which can be seen in FIG. 4.
  • this middle part 33 extends inclined to the longitudinal axis of the pivot cylinder 22.
  • the pivot cylinder 22 has thereby been rotated somewhat against the force of the spring 43, the leg 46 being pressed against the leg 45. If the middle part 33 of the link 28 now merges into the bolt latch 31, the previously deformed spring 43 can bend back again, so that the bolt 15 snaps into the bolt latch 31.
  • the ski pole has now reached its medium length.
  • the actuating member 41 is pressed inwards at the top. In this way, the pivot cylinder 22 is rotated further, so that the pin 40 is in the position 40 ′′ in the illustration according to FIG. 3.
  • the bolt latch 31 is adjusted relative to the bolt 15 such that the bolt 15 is in the middle part 34 of the link 28 4 arrives at Spring 21 continues to relax, with the swivel cylinder 22 with the outer tube section 2 and the ski stick handle being moved upward in FIG. 1, again through the course of the central part 34 of the link 28, namely inclined to the longitudinal axis of the swivel cylinder 22, the spring 43 is excited.
  • the ski pole has now reached its greatest length.
  • the screw tension spring 21 has relaxed the most, but is in the prestressed state.
  • the ski pole is shortened in the following way:
  • the bolt 15 located in the bolt latch 32 in the pivot cylinder 22 with the link 28 according to FIG. 4 must enter the bolt latch 31.
  • the bolt latch 31 means the middle pole length.
  • This desired stick length is preselected by the cross-country skier while running by pressing the actuating member 41 into its central position.
  • the articulation point 42 is in the position 42 '.
  • the spring 43 shown in FIG. 3 is preloaded by moving the spring leg 45 against the spring leg 46. This central position of the actuator 41 is determined by snapping the wart 44 into the central locking groove. So now the middle floor length has been preselected.
  • the shortening of the ski pole is now carried out simultaneously with the first pole use by the cross-country skier by pressing on the ski pole.
  • the tension spring 21 is tightened more, and the spring 43 is tensioned by the vertical inclination of the central part 34 of the link, so that the side walls of the backdrop part 34 are pressed against the backdrop stones 17 of the bolt 15.
  • the pivot cylinder 22 is rotated somewhat by the bias of the leaf spring 43 so that the bolt latch 31 comes into engagement with the bolt 15.
  • the ski pole now has its medium length, for example the normal length.
  • the swivel cylinder 22 is shown in a constant position in FIG. 4 and the bolt 15 is shown in three different heights. In reality, however, the bolt 15 remains unchanged in height and the pivot cylinder 22 assumes the three different heights relative to the bolt 15. 5 shows how the two sliding blocks 17 of the bolt 15 lie in the bolt latch 31.
  • a rectilinear backdrop section 38 is also present.
  • two pole lengths can again be set, compared to FIG. 4, a medium ski pole length and a longer ski pole length.
  • the latch 35 is engaged with the latch 15, the ski pole is of normal length, and when the latch 36 is engaged with the latch 15, the ski pole is longer.
  • the pivot cylinder 22 according to FIG. 6 is used in the ski pole handle shown in FIG. 1 and the actuating member 41 has been pressed in according to FIG. 1, the shortest stick position is set so that the latch 35 engages with the latch 15 or is coming.
  • the actuating member 41 is brought into its central position, the articulation point 42 is then in the position 42 ', the ski pole is set to its normal length, ie in this case extended, and when the actuating member 41 is pressed inwards at the top, the pivot cylinder 22 6 rotated so that it is aligned with its vertical link part 38 to the bolt 15. If the stick is now used, the pipe section 2 is pushed over the inner pipe section 1 until the upper end of the link section 38 abuts the bolt 15. Here, the tension coil spring 21 has been most tensioned.
  • the outer tube section 2 is provided with projections 47, and the pivot cylinder 22 is provided with shoulders 48, so that the components of the ski pole assembled according to FIGS. 2 and 2 are held together after assembly.
  • FIG. 6 From Fig. 6 it can be seen that from the shorter position of the ski pole (latch latch 35 in engagement with the latch 15) the straight link section 38 is reached. This means that the latch 35 is connected to the link section 38.
  • the backdrop shown in FIG. 6 could also be modified such that the backdrop trap 36 is connected to the backdrop section 38 and the backdrop trap 35 is not connected to the backdrop section 38.
  • the back and forth ski pole (link section 38 aligned with the bolt 15) is then reached from the longer position of the ski pole.
  • the configuration of the ski pole according to the invention according to claim 1 can be achieved by various structural designs.
  • the exemplary embodiment shown is particularly advantageous since few and simple components are used which can be designed to be lightweight in terms of construction, so that such a ski pole has as little additional weight as possible than a conventional ski pole which is not adjustable in length. In this way, many components can be made from a plastic that has the lowest possible specific weight. Furthermore, the few existing components are used for several purposes at the same time.
  • the locking bar 15 also serves as an anti-rotation device for the two pipe sections 1 and 2, further as a support point for the spring 21 and further as a guide for the axially displaceable ski stick handle.
  • the direction of operation of the ski pole is the same for the left and right pole.
  • the two actuators on the two ski poles are thus pushed up or down or brought into their central position, so that no different directions, depending on whether the right or left stick, have to be observed.
  • the operation of the ski pole has a logical structure.
  • the ski poles are set to the normal length, that is to say the length that the cross-country skier uses with a conventional ski pole that is not adjustable in length. If the actuators are pressed down, the ski poles are set to their shorter length. If the actuators are pushed upwards, the ski poles are adjusted to their greatest length, or when using the swivel cylinder according to FIG. 6, the ski poles are adjusted to their resilient position.
  • the command to change the pole given by the cross-country skier's finger can be given by the cross-country skier at any time during the run, ie in any current position of the ski pole, for example when the cross-country skier pulls the pole forward. If the cross-country skier gives the command to extend the stick (the actuating member 41 is pressed inwards at the top), the stick extension takes place immediately. If, on the other hand, the command is given to shorten the ski pole (the actuating member 41 is pressed inwards at the bottom), the cross-country skier makes a preselection circuit for this, since the pole shortening then takes place only on the first floor.
  • the respectively selected setting of the ski pole can be seen from the position of the actuating member 41 relative to the rest of the ski pole grip and can also be constantly felt by the cross-country skier while running.
  • the Ski pole can be extended by 40 mm from this normal length and shortened by 30 mm. With this extension by The latch bolt 32 then comes into engagement with the latch 15 by 40 mm. When the stick is shortened by the aforementioned 30 mm, the latch latch 30 then engages with the latch 15.
  • the ski pole can also be used be lengthened by 40 mm from its normal length, in which case the bolt latch 36 is in engagement with the bolt 15. With the free suspension of the ski pole, ie when the vertical link section 38 is aligned with the bolt 15, the ski pole is shortened by 70 mm in a spring-elastic manner and then lengthened.
  • a weaker spring 21 is used than if the swivel cylinder according to FIG. 6 is used, since in the first case the spring 21 is essentially only required for the automatic extension of the ski pole , so that the two pipe sections 1 and 2 do not have to be pulled apart by hand.
  • the spring 21 can be designed such that it can be brought from its shortest installation length to its longest installation length with a force of 2 kg. 6, the spring 21 is used to forcefully push the ski pole off the ground.
  • the spring 21 should then be designed so strongly that a force of up to 15 kg should be used to stretch the spring from its shortest installation length to its largest installation length.
  • the mounting of the straps 13 and 14 forming the hand strap shown in FIG. 1 by means of the eccentric 11 is very advantageous.
  • the loop length can be adjusted in an ideal way.
  • the skier inserts his hand into the formed loop and embraces the ski pole grip.
  • the skier grasps the free band ends of the bands 13 and 14 projecting downwards from the eccentric 11 and pulls them away from the inner tube section 1, so that the lever 49 of the eccentric 11 is pivoted through the band ends and the jamming is released. Now pull the ends of the band downwards until the loop enclosing the hand has the desired length.
  • the lever 49 is pressed towards the inner tube section 1 with the free hand, so that the straps 13 and 14 of the loop are clamped onto the outer tube section 2.
  • This explained adjustment of the wrist strap can thus be carried out in an ideal manner in a simple manner, with not even having to take off the gloves.

Landscapes

  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
  • Dry Shavers And Clippers (AREA)
EP82100017A 1981-01-08 1982-01-05 Skistock, der in der Länge verstellbar ist Withdrawn EP0056232A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH9681 1981-01-08
CH96/81 1981-01-08

Publications (1)

Publication Number Publication Date
EP0056232A1 true EP0056232A1 (de) 1982-07-21

Family

ID=4179156

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82100017A Withdrawn EP0056232A1 (de) 1981-01-08 1982-01-05 Skistock, der in der Länge verstellbar ist

Country Status (4)

Country Link
US (1) US4448442A (no)
EP (1) EP0056232A1 (no)
FI (1) FI820003L (no)
NO (1) NO149457C (no)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989001747A1 (en) * 1987-08-25 1989-03-09 Gunvor Karlin Length adjustable walkingstick
EP1118363A3 (en) * 2000-01-21 2002-02-13 Renato Zaltron Stick with shock-absorber

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4887625A (en) * 1988-05-26 1989-12-19 Americane, Inc. Collapsible cane
US4896687A (en) * 1988-10-31 1990-01-30 Americane, Inc. Collapsible cane
US6142526A (en) * 1999-02-16 2000-11-07 Katz; David L. Speed control pole for in-line skating
US6345843B1 (en) 1999-06-28 2002-02-12 Keith M. Barnes Snow board with collapsible ski poles and holders for same
US6782903B1 (en) 2002-09-03 2004-08-31 Robert W. Jarman Telescoping stick
SE524271C2 (sv) * 2002-10-16 2004-07-20 Bo Lerner Anordning vid en stav
WO2010044690A1 (ru) * 2008-10-14 2010-04-22 Vahrushev Yury Vasilevich Устройство для изменения положения рукоятки лыжной палки
US8006711B2 (en) * 2009-01-05 2011-08-30 Easton Technical Products, Inc. Trekking pole clamp and methods
US20100254751A1 (en) * 2009-04-02 2010-10-07 Joseph F. McMillan, III Telescoping pole system
US10856630B1 (en) * 2019-08-21 2020-12-08 Ninghai Xingda Leisure Products Co., Ltd. Automatic telescopic pole
US11957223B2 (en) * 2021-09-22 2024-04-16 Hoodco, Inc. Adjustable grip system for trekking poles and the like

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1578795A1 (de) * 1967-10-31 1971-04-08 Norbert Dr Hauser Laengenverstellbarer Skistock
DE1949078A1 (de) * 1968-01-11 1971-04-08 Herwig Kepka Einrichtung zur Rohrverbindung fuer Sicherheits-Skistoecke
AT319829B (de) * 1972-12-01 1975-01-10 Klemm Ernst Längenverstellbarer Skistock
DE2723245A1 (de) * 1977-05-04 1978-11-16 Josef Praxmayer Teleskop-skistock

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US619235A (en) * 1899-02-07 Richard schwarting
BE468340A (no) * 1944-12-28
US2719688A (en) * 1949-11-21 1955-10-04 Seifert Karl Telescopic tubes
US3960382A (en) * 1975-09-08 1976-06-01 Lawrence Peska Associates, Inc. Ski pole with retractable point
US4244602A (en) * 1976-06-01 1981-01-13 Allsop Automatic, Inc. Shock-absorbing ski pole grip and method of adjusting the same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1578795A1 (de) * 1967-10-31 1971-04-08 Norbert Dr Hauser Laengenverstellbarer Skistock
DE1949078A1 (de) * 1968-01-11 1971-04-08 Herwig Kepka Einrichtung zur Rohrverbindung fuer Sicherheits-Skistoecke
AT319829B (de) * 1972-12-01 1975-01-10 Klemm Ernst Längenverstellbarer Skistock
DE2723245A1 (de) * 1977-05-04 1978-11-16 Josef Praxmayer Teleskop-skistock

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989001747A1 (en) * 1987-08-25 1989-03-09 Gunvor Karlin Length adjustable walkingstick
EP1118363A3 (en) * 2000-01-21 2002-02-13 Renato Zaltron Stick with shock-absorber

Also Published As

Publication number Publication date
NO149457B (no) 1984-01-16
NO149457C (no) 1984-05-02
FI820003L (fi) 1982-07-09
NO820018L (no) 1982-07-09
US4448442A (en) 1984-05-15

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