SE123743C1

SE123743C1 -

Info

Publication number: SE123743C1
Authority: SE
Publication date: 1948-01-01

Description

KLASS 63 c:47 BESKRIVNING OFFENTLIGG3ORD AV KUNGL. PATENT- OCH REGISTRERINGSVERKET BEVIL3AT DEN 4 NOVEMBER 1948 PATENTTID FRAN DEN 11 JULI 1946 P UB LI C ERAT DEN 4 JANUAR! 194? Ans. den "/, 1946, nr 6221/1946. Hartill en ritning. CLASS 63 c: 47 DESCRIPTION PUBLIC WORD BY KUNGL. THE PATENT AND REGISTRATION AGENCY GRANTED NOVEMBER 4, 1948 PATENT PERIOD FROM JULY 11, 1946 P UB LI C ERAT ON JANUARY 4! 194? Ans. the "/, 1946, No. 6221/1946. Hitherto a drawing.

ROSS GEAR & TOOL COMPANY, LAFAYETTE, IND., AMERIKAS FORENTA STATER. ROSS GEAR & TOOL COMPANY, LAFAYETTE, IND., UNITED STATES OF AMERICA.

Styrmekanisin far fordon. Steering mechanism father vehicle.

I.Tppfinnare: W. K. Creson. I. Inventor: W. K. Creson.

Prioritet begard frdn den 19 november 1945 (Amerileas fiirenta staier). Priority was given on 19 November 1945 (Amerileas fiirenta staier).

Uppfinningen avser styrmekanismer for for-don, omfattande ett hus, ett i samma hus uppburet vridbart kamorgan som ãr anordnat att forbindas med en styraxel och forsett med en i huvudsak skruvformig kamranna, i vii-ken ingriper kuggtappar anordnade pa ett segment, som är uppburet i namnda hus pa en frau kamorganets axel skild axe! anordnad i ett mot namnda kamorgans axel vinkelratt plan, varvid axeln Or anordnad att forbindas med de styrbara fordonshjulen. The invention relates to steering mechanisms for vehicles, comprising a housing, a rotatable cam member supported in the same housing which is arranged to be connected to a guide shaft and provided with a substantially helical cam groove, in which engages toothed pins arranged on a segment which is supported in the said house on a woman's cam member's shaft separate ax! arranged in a plane perpendicular to the axis of said cam member, the shaft Or being arranged to be connected to the steerable vehicle wheels.

Uppfinningen karakteriseras darav, att det naninda segmentet uppbar tva par kuggtappar, vilka Oro anordnade att ingripa i kamrannan nara motsatta andar av namnda kamorgan, nar segmentet ar nara mittpunkten av silt installningsomthde med de tva kuggtapparna av varje par ingripande i narbelagna vary ay natunda kamranna och med minst ett vary av namnda kamranna liggande mellan de tva innerst liggande kuggtapparna. The invention is characterized in that the ninth segment has two pairs of toothed pins, which are arranged to engage in the cam member near opposite spirits of said cam means, when the segment is near the center of silt installation circumference with the two toothed pins of each pair of engagement members. with at least one vary of said chamber lying between the two innermost toothed pins.

Dessutom karakteriseras foreliggande uppfinning &ray, att namnda kuggtappar Oro anordnade att utfOra en begransad vinkelrOrelse relativt varandra kring svangaxeln, varjamte elastiska organ Oro anordnade motverkande sadan rorelse. In addition, the present invention is characterized in that said toothed pins Oro arranged to perform a limited angular movement relative to each other about the pivot axis, and elastic means Oro arranged counteracting such movement.

Ett annat kannetecken pa uppfinningen Or att namnda kamranna bar utat divergerande sidovaggar och att namnda kuggtappar yid sina andar Oro koniskt avsmalnande motsvarande divergensen av namnda rannas si(Tor, varjamte de Oro anordnade rorliga i namnda segment i sin egen langdriktning. Another characteristic of the invention is that said chamber bears outwardly diverging side walls and that said toothed pins in their spirits cone tapered corresponding to the divergence of said ranna si (Tor, and the Oro arranged movable in said segment in their own longitudinal direction.

Vidare karakteriseras uppfinningen darav, att elastiska organ aro anordnade att motverka kuggtapparnas rorelse bort fran kamorganet. Furthermore, the invention is characterized in that elastic means are arranged to counteract the movement of the toothed pins away from the cam member.

Ett ytterligare kannetecken p0 uppfinningen Or att ett kuggtapparna paverkande organ Or sa anordnat att det foranleder den ena kuggtappen att rara sig mot kamorganet, nar den andra ror sig frail detsamma. A further feature of the invention is that a member acting on the pin pins is arranged so as to cause one pin to move towards the cam member when the other moves freely therefrom.

En faktor, som in-verkar pa huvuddimensionerna av en sadan styrmekanism utgores av den belastning, som overfores mellan kugg-- tappen och kamrannans sidovaggar. Saval kuggtanden som den skruvformiga vagg, som skiljer de narmast varandra belagna varven av kamrannan maste ha vissa minimidimensioner, f6r att med sakerhet kunna overf8ra de belastningar, sons i driften komma att pOverka dem. Om det Or onskfart att styrmekanismen besitter en relativt hog mekanisk styrka, sit Or det ofta nodvandigt att Oka styrmekanismens huvuddimensioner i icke brisk-Yard grad for att fh kuggtappen och kamvaggen tillrackligt starka, ty den minsta delning man kan ge Ot kamrannan begransas av den minsta -LAU:dna kamvaggstjockleken och ay den minsta tillatna bredden av den kuggtappen upptagande kuggrannan. A factor which affects the main dimensions of such a steering mechanism is the load which is transmitted between the pin and the side walls of the cam. Saval cog as the helical cradle, which separates the nearest spaced-out turns of the cam, must have certain minimum dimensions, in order to be able to safely transfer the loads which in operation will affect them. If it is desired that the steering mechanism possess a relatively high mechanical strength, it is often necessary to increase the main dimensions of the steering mechanism to a non-brisk-Yard degree in order to make the pin and camshaft sufficiently strong, for the smallest pitch can be given by the smallest -LAU: dna cam wall thickness and ay the minimum permissible width of the tooth pin receiving tooth neighbor.

Ett andamal med fOreliggande uppfinning Or att anordna en st3,Tmekanism med relativt hog mekanisk styrka utan att styrinekanismens huvuddimensioner i icke onskvard grad okas. An object of the present invention is to provide a control mechanism with relatively high mechanical strength without unduly increasing the main dimensions of the control mechanism.

Ett annat andamal med uppfinningen Or att anordna en styrmekanism, som, i det den be-sitter en relativt hog mekanisk styrka, fortfarande ager tillrOeklig omlaggningsmojlighet vid och nara mittpunkten for doss installningsomrade, for att gora det mojligt for foraren att ha en kansla av vagens reaktion mot fordonshjulen och att understodja foraren i att aterfOra de styrbara hjulen till deras normala raktframatlage. Another object of the invention is to provide a steering mechanism which, in that it possesses a relatively high mechanical strength, still acts as a sufficient rearrangement possibility at and near the center of the installation area, in order to enable the driver to have a chancel of the carriage. reaction to the vehicle wheels and to assist the driver in returning the steerable wheels to their normal straight forward position.

For uppfinningens forverkligande anordnas en rad ay kuggtappar p0 svangarmen, vilka ingripa i skilda vary av den skruvformiga kamrannan. Foretradesvis anvandas tva par kuggtappar, sa anordnade, att vinkeln mellan det ena parets kuggtappar, raknad frail svangarmen, Or densamma sons vinkein mellan det andra parets kuggtappar och lika med halften av vinkeln mellan de varandra narmast belagna kuggtapparna av de tva paren. Kamrannan har en effektiv delning sadan att de fyra kuggtapparna Overspanna fyra vary av skruven, for att lamna det 1 mitten av de 2— — fyra varven liggande yarvet frill Iran -varje kuggtapp. For the realization of the invention, a series of toothed pins are arranged on the pivot arm, which engage in different variations of the helical chamber. Preferably, two pairs of toothed pins are used, arranged so that the angle between one pair of toothed pins, shaved frail the brace, or the same son's angle between the other pair of toothed pins and equal to half the angle between the closely spaced toothed pins of the two pairs. The cam has an effective division so that the four toothed pins overspread four varices of the screw, to leave the yarvet lying in the middle of the 2— - four turns frill Iran - each toothed pin.

Bifogade ritning askadliggor uppfinningen. - Fig. 1 utgor en sidovy ay styrmekanismen :med locket borttaget. Fig. 2 utgor en tvärsek- honlinjen 2-2 i fig. 1. Fig. 3 är en sek- -tion efter linjen 3-3 i fig. 1 och fig. 4 och 5 utgora sektioner liknande fig. 3 och visa modifikationer i utfOrandet. The attached drawing illustrates the invention. Fig. 1 is a side view of the steering mechanism: with the lid removed. Fig. 2 is a cross-sectional view taken along line 2-2 of Fig. 1. Fig. 3 is a section taken along line 3-3 of Fig. 1 and Figs. 4 and 5 are sections similar to Fig. 3 and show modifications in Figs. the execution.

Den i ritningen visade styrmekanismen be-star ay ett hus forsett med lager 11, som yridbart uppbara ett kamorgan 12. Vid ena sidan ay huset och i linje med kamorganets axel är en styrpelare 13 fastmonterad, vilken omsluter en styraxel 14, som pa lamligt satt ãr arbetsforbunden med kamorganet 12. The guide mechanism shown in the drawing consists of a housing provided with bearings 11, which rotatably support a cam member 12. At one side of the housing and in line with the axis of the cam member, a guide column 13 is fixedly mounted, which encloses a guide shaft 14 which is are working with the cam member 12.

Under kamorganet 12 är huset fOrsett med ett lager 15, som vridbart omfattar en sYlingaxel 16 skjutande from ur huset och 'rid sin yttre ande fOrsedd med en styrarm 17, anordnad for att pa kant satt fOrbindas Tiled fordonets styrbara hjul. mom huset är svangaxeln 16 stelt forbunden med segment 18, som skjuter upp yid ena sidan ay kamorganet 12. Lampligen ãr segmentet 18 utformat i ett stycke med axeln 16 och huset är ifirsett med en oppen sida, anordnad all tillslutas med ett lock 19 och senora vilken axeln och annarna kunna insattas yid monteringen av stynnekanismen. Vardera av segmentets 18 tva armor är forsedd med ett par kuggtappar 20 och 21, vilka skjuta ut fran resp. arm och ingripa i olika vary av en i sin helhet skruvfonnig -kamranna 22, anordnad i kamorganet 12. Under the cam means 12 the housing is provided with a bearing 15, which rotatably comprises a cylinder shaft 16 projecting from the housing and its outer end is provided with a guide arm 17, arranged to be connected at the edge to the steerable wheels of the vehicle. In the housing, the pivot shaft 16 is rigidly connected to the segment 18, which projects on one side of the cam member 12. Lamply, the segment 18 is formed integrally with the shaft 16 and the housing is provided with an open side, arranged all closed with a lid 19 and senora which shaft and the others can be inserted yid the mounting of the groove mechanism. Each of the segment's two arms is provided with a pair of toothed pins 20 and 21, which project from resp. arm and engage in various varies of a wholly helical chamber 22, arranged in the cam member 12.

Vid ett lampligt utforande av uppfinningen har kamrannan 22 en likforrnig effektiy delning d. v. s. den iir sâ utformad att fOrhallandet mellan axelns 14 vridningsvinkel och amens 18 vridningsvinkel ar konstant. De fyra kuggtapparna 20 och 21 aro monterade pa lika aystand frail sviingaxelns 16 axel och dro sä beliigna relativt denna axel, alt de tva kuggtapparna ay vardera paret upptaga niirbelügna vary av rannan 22 och att de tva -kuggtapparna 20 upptaga alternerande vary av denna ranna. I den a ritningen visade speciella konstruktionen ligga de hada kuggtapparna 20 och 21 av varje par skilda genom en vinkel av 18° raknad fran sviingaxeln 16, under det att de tya kuggtapparna 20 am skitda genom en vinkel av 36°, raknad frail samma axel. Resultatet fir att stynnekanismen har en mekanisk utvaxling ay c:a 20: 1. In an exemplary embodiment of the invention, the cam groove 22 has a uniform power distribution, i.e. it is designed so that the ratio between the angle of rotation of the shaft 14 and the angle of rotation of the shaft 18 is constant. The four toothed pins 20 and 21 are mounted at equal distances from the axis of the pivot shaft 16 and are so located relative to this axis that all the two toothed pins on each pair occupy the adjacent shaft of the groove 22 and that the two toothed pins 20 receive alternating variations of this groove. In the special construction shown in the drawing, the toothed pin pins 20 and 21 of each pair are separated by an angle of 18 ° razed from the pivot axis 16, while the ten pin pins 20m project through an angle of 36 °, razed from the same axis. The result is that the thinning mechanism has a mechanical gear ratio of about 20: 1.

Det är onskvart att styrinekanismen ãr sa anordnad att minst tva ay de fyra kuggtapparna aro i ingrepp med kamrannan over axelns 16 hela installningsomrade. Som resultat harav kommer den mellan kamorganet 12 och armarna 18 ayerfiirda belastningen att fordelas pa minst tya av kuggtapparna och kan fordelas pa sa manga som fyra. Pa grund _ay denna belastningens fordelning kunna kuggtapparna utfiiras klenare an om en enda kuggtapp skulle averfora hela belastningen. It is undesirable that the steering mechanism is so arranged that at least two of the four toothed pins are in engagement with the cam groove over the entire installation area of the shaft 16. As a result, the load carried between the cam member 12 and the arms 18 will be distributed on at least ten of the toothed pins and can be distributed on as many as four. Due to the distribution of this load, the toothed pins can be made smaller than if a single toothed pin were to carry the entire load.

Genom att Ora kuggtapparna mindre kan bredden av kamrannan 22 minskas och tjockleken, och damned hallfastheten, av -vaggen, som skiljer kamrannans vary at, Ras. By making the pin teeth smaller, the width of the cam groove 22 can be reduced and the thickness, and damned the hall strength, of the cradle, which separates the cam groove vary at, Ras.

Emedan yid en given anordning av axlarna for kamorganet 12 och svangaxeln 16 en okning av st3Tmekanismens mekaniska styrka atfOljes ay minskat aystand mellan kamrannans varandra narliggande vary och av minskad tjocklek av vaggen mellan dessa varandra narliggande rannvarv, sa är uppenbart att genom lastens fordelning pa ett flertal kuggtappar styrmekanismens huyuddimensioner kunna materiellt reduceras. Since in a given arrangement of the shafts of the cam member 12 and the pivot shaft 16 an increase in the mechanical strength of the support mechanism is accompanied by a reduced distance between the adjacent chamber members and a reduced thickness of the cradle between these adjacent ridge turns, it is obvious that toothpicks the huyudd dimensions of the steering mechanism can be materially reduced.

For anpassning till en oundviklig mindre noggrannhet vid tillyerkningen kan det vara Onskyart att traffa anordningar for en begransad relatiy rarelse hos kuggtapparna 20 och 21. Fiera satt att astadkomma detta askadliggoras i ritningen. Vid den i fig. 3 visade konstruktionen uppbares varje kuggtapp i sin tillhOrande arm 18 medelst en bussning 25 ay nagot eftergivande material sasom t. ex. gununi. Med en sadan anordning skulle en kuggtapp sasom resultat ay en mindre noggrann tillverkning bli utsatt for en sti3rre belastning an den som overfOres genom andra kuggtappar, dess tillhorande bussning 25 skulle se efter och skulle till stor del befria en sadan kuggtapp fran (less overbelastning. In order to adapt to an unavoidable lesser accuracy in the marking, it may be unthinkable to find devices for a limited relation of the toothed pins 20 and 21. Several ways of achieving this are illustrated in the drawing. In the construction shown in Fig. 3, each toothed pin is supported in its associated arm 18 by means of a bushing 25 of some resilient material such as e.g. gununi. With such a device a toothed pin would, as a result of a less accurate manufacture, be subjected to a greater load than that transmitted by other toothed pins, its associated bushing 25 would look after and would largely free such a toothed pin from (less overload.

Dar de i rannan ingripande delarna ay kuggtapparna 20 och 21 ha form ay en stympad kon, yilket är lampligt, kommer reaktionstrycket fran kamrannans sidoyagg att paverka kuggtappen med en langs densamma gaende komponent. Vid en sadan anordning kan den i fig. 4 visade utjamnande konstruktionen komma till anvandning. Har dro kuggtapparnas axlar sakert fasthallna i fasta lagen relativt varandra, men varje kuggtapp dr 'rid sin ytterande fOrbunden med en eftergivande dyna 26, som senora att ge efter kan tillata kuggtappen en utatgaende rorelse under en overbelastning. If the parts engaging in the gutter in the toothed pins 20 and 21 have the shape of a truncated cone, which is suitable, the reaction pressure from the side yaw of the cam rim will affect the toothed pin with a component running along it. In such a device, the leveling structure shown in Fig. 4 can be used. The shafts of the toothed pins have securely fastened in the fixed layers relative to each other, but each toothed pin has its outer connection with a resilient pad 26, which later to give in can allow the toothed pin an outward movement during an overload.

Vid del i fig. 5 visade utforandet aro de i form av stympade koner utforda kuggtapparna fritt glidbara i sin egen axelriktning i den tillhorande armen 18, kuggtapparnas -varandmt narmast belagna ytor dm snett avskurna sasom visas yid 27 och mellan de sa aysedda ytorna ar ett elastiskt tryckorgan 28 foretradesvis en kula. Uppenbarligen komma de lutande ytorna 27 och kulan 28 att medverka till utjamnandet av ett axiellt tryck pa de hada kuggtapparna 20 och 21 hos vardera paret, pa sd siitt utjamnande den tangentiella pa- känning som av kamorganet Oyerfores till dessa kuggtappar. In the embodiment shown in Fig. 5, the truncated cones challenging in the form of truncated cones are freely slidable in their own axis direction in the associated arm 18, the toothed pins of the toothed pins being closest to each other, obliquely cut off as shown in Fig. 27 and between elastic pressure member 28 preferably a ball. Obviously, the inclined surfaces 27 and the ball 28 will contribute to the equalization of an axial pressure on the hot toothed pins 20 and 21 of each pair, thereby equalizing the tangential stress exerted by the cam member Oyerfores to these toothed pins.

Franvaron ay en kuggtapp i det icke upptagna mellersta yaryet ay kamorganet mittemellan de bada kuggtapparna 20, akar styrmekamsmens omlaggbarhet. The absence of a tooth pin in the non-occupied central yary of the cam member midway between the two toothed pins 20 increases the releasability of the guide cam.

Av fig. 1 framgar att 'rid vardera av de yttre kuggtapparna vinkeln mellan kamran- — —3 n.ans normal och linjen som forenar centrum av kuggtappen med centrum av svangaxeln 16 ãr mindre an motsvarande vinkel vid vardera av de inre kuggtapparna och att varje sadan senare vinkel ãr i sin tur mindre an en motsvarande vinkel skulle vara vid en kuggtapp, som vore belagen i kamrarmans mellersta vary mittemellan de inre kuggtapparna. Detta framgar av det faktum, att nar en kuggtapp forflyttas bort fran ett lage narbelaget kamorganets 12 mitt, sh minskas vinkeln mellan kamorganets reaktion pa densamma och linjen dragen frhn dess centrum till axelns 16 centrum. Stravan hos kamorganets reaktion att soka vrida axeln 16 blir mindre nar den paverkar en kuggtapp nara anden av kamorganet an nar den paverkar en kuggtapp nara kamorganets mitt, ty kamorganets reaktionshavarm blir mindre nar kuggtappen ligger nara kamorganets ande an nar den ligger nara dess mitt. Harav foljer att nar en yttre vridkraft phverkar axeln 16 genom overforandet av en vagreaktion till armen 17, sa kommer kamorganets reaktion att paverka en kuggtapp nara kamorganets ande att vara mindre effektiv i att motsatta sig svangaxelns vridning an samma kamorganets reaktion skulle vara om den paxerkade en kuggtapp nara kamorganets mitt. From Fig. 1 it can be seen that each of the outer toothed pins rides the angle between the ventricle normal and the line joining the center of the toothed pin with the center of the pivot shaft 16 is less than the corresponding angle at each of the inner toothed pins and that each such later angle is in turn less than a corresponding angle would be at a pin, which would be located in the middle of the chamber of the chamber varying between the inner pin. This is evident from the fact that when a toothed pin is moved away from a center of the adjacent bearing cam member 12, the angle between the cam member response thereto and the line drawn from its center to the center of the shaft 16 is reduced. The penalty of the cam member's reaction to seek to rotate the shaft 16 becomes less when it acts on a pin near the spirit of the cam than it acts on a pin near the center of the cam, for the cam's reaction arm becomes smaller when the pin is near the spirit of the cam than when it is near its center. It follows that when an external torsional force acts on the shaft 16 by transmitting a vagal reaction to the arm 17, the cam member response will act as a pinion near the spirit of the cam member will be less effective in resisting rotational shaft rotation than the reaction of the same cam member would be. gear pin near the center of the cam organ.

Armarna 18 on de av dem uppburna kuggtapparna visas i fig. 1 i de lagen, som de hitaga, nar fordonets styrbara hjul Aro i lige rakt framat, mot vilket lage vid flertalet Cordon, vagreaktionen tenderar att rikta dem. Under dessa omstandigheter fordelas kamorganets totala reaktion mellan de pa avstand Iran kamorganets mitt placerade kuggtapparna och är i foljd harav relativt oformogen att motsatta sig de styrbara fordonshjulens rorelse mot det rakt framat riktade lage, mot vilket vagreaktionen tenderar att rikta dem. Del ãr pa grund harav som en kuggtapp utelamnas i laget mitt emellan de inre kuggtapparna 20, ty den del av kamorganets totala reaktion, som skulle paverka en sa belagen kuggtapp komme att bli relativt effektiv i att motsatta sig svangaxelns vridning under va.greaktionens inverkan Overlord till densamma. Med andra ord genom utelamnande av en kuggtapp som komme att ligga i kamorganets centrala vary, nar fordonets styrbara hjul Aro riktade rakt Cranial, sh liar styrmekanismens omlaggbarhet Okats i narheten av mittpunkten fOr dess installningsomrade, harigenom minskande motstandet, som styrmekanismen erbjuder mot de styrbara hjulens atervandan de till sitt rakt framat riktade lage, sedan de forflyttats frau detsamma och 'Mande fOrarens kansel eller kansla for de styrbara hjulens reaktion. The arms 18 on the toothed pins supported by them are shown in Fig. 1 in the layers which they hit, when the steerable wheels of the vehicle are Aro in a straight line forward, against which layer at the majority of the Cordon, the rocking reaction tends to direct them. Under these conditions, the overall reaction of the cam member is distributed between the toothed pin positions spaced apart from the center of the cam member and is consequently relatively incapable of opposing the movement of the steerable vehicle wheels against the straight forward bearing bearing. Part of this is because a tooth pin is omitted in the joint between the inner tooth pins 20, because the part of the cam member's total reaction which would affect such a coated tooth pin will be relatively effective in resisting the rotation of the pivot shaft under the influence of the reaction. to the same. In other words, by omitting a pin that will lie in the central gear of the cam member when the steerable wheels of the vehicle are directed straight cranially, the releasability of the steering mechanism is increased near the center of its installation area, thereby reducing the resistance offered by the steering mechanism to the steerable wheels. return to their straight forward position, after being moved from the same and 'Mande fOraren's pulpit or pulpit for the controllable wheel reaction.

Claims

Patent claim:

A steering mechanism for vehicles comprising a housing, a rotatable cam member (12) supported in the same housing, which is arranged all connected to a steering shaft (14) and provided with a substantially helical cam groove (22), in which engaging toothed pins arranged on a segment (18) supported in said housing on a shaft (16) separated from the axis of the cam member arranged in a plane perpendicular to the axis of said cam member, the shaft (16) being arranged to be connected to the steerable vehicle wheels, drawn therefrom, that the segment (18) carries two pairs of toothed pins (20, 21), which are arranged to engage in the cam groove (22) close opposite spirits of said cam member (12), when the segment is near the center of the silt installation area with the two toothed pins (20, 21) of each pair of engaging adjacent tubes vary by said cam (22) and with at least one vary of said cam lying between the two innermost toothed pins (20).

Steering mechanism according to claim 1, characterized in that said toothed pins (20, 21) are arranged to perform a limited angular angle relative to each other around the pivot axis (16) and elastic members (25) are arranged to counteract such movement.

Control mechanism according to claim 1, characterized in that said chamber (22) has diverging side cradles and in that said toothed pins at their ends are conically tapered corresponding to the divergence of said sides of said groove, and the grooves arranged in said segment (18) in their own long direction.

Guide mechanism according to claim 1 and 3, characterized in that elastic means (26) are arranged to counteract the movement of the toothed pins (20, 21) away from the cam member (12).

Guide mechanism according to claims 1 and 3, characterized in that a means (28) or one actuating the toothed pins (20, 21) is arranged so that it causes one toothed pin to move towards the cam member when the other moves away from the same. Stockholm 194S. Kungl. Boktr. P. A. Norstedt & SSner 480089