SI8010447A8

SI8010447A8 - Lock for the flap-shaped back door of a motor vehicle

Info

Publication number: SI8010447A8
Application number: SI8010447A
Authority: SI
Inventors: Vittorio Grassi
Original assignee: Rockwell Automotive Body Syst
Priority date: 1979-02-21
Filing date: 1980-02-19
Publication date: 1994-12-31

Description

Ključavnica za loputasta zadnja vrata vozila mora razen zaklepanja vrat v zaprtem položaju tudi preprečevati pre2 mikanje vrat relativno glede na fiksno konstrukcijo vozila. Zlas ti pa mora preprečiti premikanje spodnjega dela vrat v ravnini, v kateri sta osi obešenja vrat skupaj s ključavnico, v smereh tako pravokotno na os obešenja kakor tudi vzporedno z njo.In addition to locking the door in the closed position, the lock for the tailgate of the vehicle must also prevent the door from sliding over relative to the fixed structure of the vehicle. In particular, these must prevent the lower part of the door from moving in a plane in which the axes of suspension of the door are together with the lock, in directions perpendicular to and parallel to the axis of suspension.

Izum je osnovan na problemu, kako zasnovati ključavnico zgoraj navedene vrste, da bo preprečen pojav zračnosti med njenimi deli.The invention is based on the problem of how to design a lock of the type mentioned above so as to prevent the appearance of a gap between its parts.

Stanje tehnikeThe state of the art

Iz sovjetskega avtorskega spričevala št. 382 801 je znana ključavnica, ki na začetku lahko preprečuje zgoraj opisane premike, pa se med naletnim elementom ključavnice in sodelujočimi elementi ključavnice lahko pojavi zračnost bodisi zaradi pomanjkljivosti pri izdelavi ali pa,sčasoma, zaradi obrabe.From Soviet copyright certificate no. 382 801 is a well-known lock that can initially prevent the movements described above, but there may be a gap between the locking element and the associated locking elements, either due to manufacturing defects or, over time, due to wear and tear.

Opis rešitve problemaDescription of the solution to the problem

Problem je po izumu rešljiv s ključavnico, katere nosilna plošča je zasnovana z izrezom za vstopanje in izstopanje cilindričnega naletnega elementa, katerega os je v bistvu pravokotna na ravnino plošče, pri čemer se ta naletni element giblje v smeri pravokotno na svojo os;The problem according to the invention is solved by a lock whose carrier plate is designed with a cutout for entering and exiting a cylindrical pendulum element, the axis of which is substantially perpendicular to the plane of the plate, the said piling element moving in a direction perpendicular to its axis;

na plošči je zasučno pritrjenih dvoje vzvodov, vsak na svoji strani izreza glede na smer gibanja naletnega elementa, pri čemer je vsak vzvod izveden s sedežem v obliki ločne kotanje in je zasučen okrog osi, pravokotne na ploščo, med odprtim položajem ključavnice, v katerem sta sedeža usmerjena proti vstopu izreza in omogočata gibanje naletnega elementa med njima, in zaprtim položajem ključavnice, v katerem sta sedeža obrnjena drug k drugemu in v bistvu oklepata cilindrično površino naletnega elementa, ko je le-ta razporejen v izrezu in je v njem blokiran, pri čemer imata sedeža nadalje površini za sodelovanje z naletnim elementom, ki sta v odprtem položaju ključavnice v dotiku in ju naletni element premakne v izrez, s čimer se vzvoda zasukata v zaklenjeni položaj ključavnice; zaustavijalni element je zasučno pritrjen na enem od obeh vzvodov, pri čemer se med zaustavijalnim elementom in nosilno ploščo ključavnice razteza prožno sredstvo, ki vleče navedeni vzvod proti odprtemu položaju ključavnice in vleče zaustavijalni element v stik z drugim vzvodom, pri čemer je zaustavijalni element izveden z naležno površino, ki v primeru naleganja naletnega elementa med sedežema vzvodov v zaklenjenem položaju ključavnice dopušča drsenje navedenega drugega vzvoda po naležni ploskvi pod vplivom prožnega sredstva v položaj, v katerem je drugi vzvod pritisnjen k naletnemu elementu, da je naletni element vpet med sedežema; premikalno sredstvo za zasuk zaustavijalnega elementa iz njegovega položaja, v katerem je ključavnica odprta, pa preneha nalegati med zaustavijalnim ele4 mentora in drugim vzvodom, tako da se navedeni vzvod lahko zasuka v odprti položaj ključavnice pod vplivom prožnega sredstva, zaustavljalni element zdrsne v stik z drugim vzvodom, katerega zasuka v odprti položaj ključavnice, drugi vzvod pa zaskoči z navedeno naležno ploskvijo v odmaknitvi od zaustavijalnega elementa iz odprtega v zaprti položaj ključavnice.there are two levers pivotally mounted on the plate, each cut on its side according to the direction of motion of the colliding element, each lever being made with a seat in the form of a separate angle and rotated about an axis perpendicular to the plate between the open position of the lock in which the seats are directed towards the entrance of the notch and allow movement of the impact element between them, and the closed position of the lock in which the seats are facing each other and essentially surround the cylindrical surface of the impact element when it is arranged in the notch and is locked therein, at the seats further having surfaces for engagement with the impact element, which are in the open position of the lock in contact and are moved by the impact element into the recess, thereby rotating the levers into the locked position of the lock; the stopping element is pivotally mounted on one of the two levers, extending between the stopping element and the locking plate of the locking means, which pulls said lever towards the open position of the lock and pulls the stopping element in contact with the other lever, the stopping element being made by a contact surface which, in the case of a contact member between the lever seats in the locked position of the lock, permits said second lever to slide along the contact surface under the influence of the flexible means to a position in which the second lever is pressed against the impactor so that the impactor is engaged between the seats; the movable means for rotating the stopping element from its position in which the lock is open ceases to engage between the stopping element and the second lever so that said lever can be rotated to the open position of the lock under the influence of the flexible means, the stopping element sliding in contact with the other lever, which rotates to the open position of the lock, and the second lever snaps with said contact surface away from the stopping element from the open to closed position of the lock.

Prožno držanje sedežev v stiku z naletnim elementom v zaklenjenem položaju ključavnice po izumu zagotavlja, da se odpravi sleherno zračnost, ki se utegne pojaviti zaradi izdelovalnih nenatančnosti ali obrabe.The flexible seating of the seats in contact with the impact element in the locked position of the lock according to the invention ensures that any playfulness that may occur due to manufacturing inaccuracies or wear is eliminated.

Prednostno je vzvod, na katerem je pritrjen zaustavljalni element, izveden z grebensko površino za sodelovanje z drugim vzvodom, s čimer pripomore pri odpiranju ključavnice. Prednostno je predviden mejnik za omejevanje zasučnega gibanja vzvodov pri odpiranju ključavnice, da je določen navedeni odprti položaj, medtem ko je za omejevanje potovanja vzvodov pri zapiranju ključavnice predviden nadaljnji mejnik.Preferably, the lever on which the stop element is attached is provided with a ridge surface to cooperate with another lever, thereby assisting in opening the lock. Preferably, a milestone is provided to limit the rotary movement of the levers when the lock is opened to determine said open position, while a further milestone is provided to limit the travel of the levers when the lock is closed.

Primer izvedbeAn example implementation

Izvedbeni primer izuma bomo v nadaljnjem pobliže opisali na osnovi priloženega načrta, v katerem kaže sl. 1 pogled na delno prerezano ključavnico po izumu v njenem odprtem položaju, sl. 2 podobno kot sl. 1, le da je ključavnica v zaklenjenem položaju, sl. 3 ključavnico s sl. 1 v tlorisni projekciji, toda v zaklenjenem položaju, torej v pogledu pravokotno na prerez s sl. 1, ter sl. 4 prerez po črti IV-IV s sl. 2, ki kaže le del ključavnice zaradi razjasnitve povezave.A further embodiment of the invention will now be described in greater detail on the basis of the attached plan, in which FIG. 1 is a view of a partially sectioned lock according to the invention in its open position; FIG. 2 similar to FIG. 1, except that the lock is in the locked position; 3 is a lock in FIG. 1 in plan view, but in a locked position, i.e. in view perpendicular to the cross section of FIG. 1, and FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 2, which shows only part of the lock to clarify the connection.

Ključavnica obsega nosilno konstrukcijo 2, ki obsega ploščo 2a (sl. 3), ki je izvedena z izvrtinami 3 za pritrditev konstrukcije 2 k motornemu vozilu. Ključavnica nadalje vsebuje v splošnem cilindričen zaletni element 4 (sl. 1 in 2), ki sodeluje z zaklepalnima vzvodoma 7, 7’, ki ju nosi nosilna konstrukcija 2, in služi za zaklepanje vrat vozila v zaprtem položaju. Nosilna konstrukcija 2 je pritrjena na tleh vozila, naletni element 4 pa je fiksiran na zadnjih vratih vozila; lahko pa je tudi obratno.The lock comprises a supporting structure 2 comprising a plate 2a (Fig. 3) which is made with holes 3 for attaching the structure 2 to the motor vehicle. The lock further comprises generally a cylindrical starter element 4 (Figures 1 and 2) which cooperates with the locking levers 7, 7 'carried by the supporting structure 2 and is used to lock the vehicle door in the closed position. The supporting structure 2 is fixed to the floor of the vehicle and the impactor 4 is fixed to the rear door of the vehicle; but it can also be the other way around.

Nosilna konstrukcija 2 nadalje obsega ravno ploščo 2b (sl. 1 in 2), ki leži v ravnini pravokotno na ploščo 2a in na os naletnega elementa 4. Plošča 2b ima sedlast izrez 5, v katerega vstopa naletni element 4 v smeri pravokotno na svojo os pri zaklepanju vrat. Nosilna konstrukcija 2 ima še dvoje bočnih sten 2b, ki štrlita iz robov plošče 2b na nasprotnih si stenah izreza 5 glede na traso gibanja naletnega elementa 4. Steni 2b sta druga proti drugi nagnjeni, nagnjeni pa sta tudi proti vstopu izreza 5 za sodelovanje z ustreznima vzmetnima elementoma 20, ki ju nosi naletni element 4 za vodenje elementa 4 v izrez 5.The supporting structure 2 further comprises a flat plate 2b (FIGS. 1 and 2) which lies in a plane perpendicular to the plate 2a and to the axis of the ply member 4. The plate 2b has a saddle notch 5 into which the ply member 4 enters perpendicularly to its axis when locking the door. The supporting structure 2 has two lateral walls 2b projecting from the edges of the panel 2b on the opposite walls of the cutout 5 with respect to the path of motion of the collision element 4. The walls 2b are inclined towards each other, and also inclined towards the entrance of the cutout 5 to cooperate with the corresponding the suspension elements 20 carried by the impact element 4 to guide the element 4 into the recess 5.

Plošča 2b nosi zaklepalna vzvoda 7, 7’, ki sta vsak zase zasučno pritrjena na vsakokratnem sorniku 9 za nihajno gibanje okrog ustreznih osi 6, ki sta pravokotni na ploščo 2b. Vzvoda 7, 7’ sta pritrjena na nasprotnih si straneh izreza 5 glede na traso gibanja naletnega elementa 4 in sta izvedena vsak s svojim ločnim sedežem 8.Plate 2b bears locking levers 7, 7 ', which are each pivotally attached to each bolt 9 for oscillating motion about corresponding axes 6 perpendicular to plate 2b. The levers 7, 7 'are secured to opposite sides of the recess 5 with respect to the course of motion of the collision element 4 and are each made with their separate seat 8.

V odprtem položaju ključavnice (sl. 1) sta sedeža 8 obrnjena proti vstopu v izrez 5, pri čemer sta navznotranja končna odseka ločnih sedežev 8 postavljena nasproti naletnemu elementu 4, ki pri naletu nanju povzroči zasuk vzvodov 7, 7’ v zaprti položaj ključavnice, kot ga kaže sl. 2. V slednjem položaju sta sedeža 8 obrnjena drug proti drugemu in tvorita v bistvu krožno odprtino, v katero je spravljen naletni element 4.In the open position of the lock (Fig. 1), the seats 8 are facing the entrance to the recess 5, and inwardly the final sections of the separate seats 8 are positioned opposite the impact element 4, which, when encountered, rotates the levers 7, 7 'into the closed position of the lock, as shown in FIG. 2. In the latter position, the seats 8 are facing each other to form essentially a circular opening into which the impactor 4 is housed.

Kot je razvidno s sl. 4, ima nosilna plošča 2b v območju sornikov 9 dvignjen odsek 2c, tako da sta površini vzvodov 7,As can be seen from FIG. 4, the bearing plate 2b has a raised section 2c in the area of the bolts 9 such that the surfaces of the levers 7,

7’, ki mejita na ploščo 2b, odmaknjeni od glavnine ploščne površine, s čimer je zagotovljena prosta rotacija vzvodov 7, 7’ relativno glede na ploščo 2b.7 'adjacent to plate 2b, away from the bulk of the plate surface, thereby ensuring free rotation of the levers 7, 7' relative to plate 2b.

Na vzvodu 7 je s pomočjo sornika 11 z zasučno osjo 12 pritrjen vzporednoz osjo 6 zaustavijalni element 10, ki je vzmetno pritisnjen na štrleč zob 16 drugega vzvoda 7’ . En konec sornika 11 štrli iz vzvoda 7, h kateremu je priključen, v ločni izrez 15 ploš če 2b, ki omogoča potovanje sornika 11 in z njim zaustavijalnega elementa 10 pri sukanju vzvoda 7 okrog njegovega sornika 9.At the lever 7, a stop element 10 is attached to the lever 11 with a rotary axis 12, parallel to the axis 6, which is spring-loaded on the projecting tooth 16 of the second lever 7 '. One end of the bolt 11 protrudes from the lever 7 to which it is connected, into a separate cutout 15 of the plate 2b, allowing travel of the bolt 11 and the stopping element 10 therewith when rotating the lever 7 around its bolt 9.

Vijačna vzmet 14 zaustavijalnega elementa 10 je z enim koncem obešena na jeziku 13 zaustavljalnega elementa 10, z drugim koncem pa je priključena k nosilni konstrukciji 2 ključavnice, tako da skuša zaustavijalni element 10 in z njim vzvod 7 zasukati v glede na sl. 1 protiurinem smislu v odprti položaj ključavnice. Zaustavijalni element 10 in zob 16 sta zasnovana tako, da v odprtem položaju ključavnice (sl. 1) bočni rob zoba 16 nalega na vzdolžno stranico 17 zaustavijalnega elementa 10, toda pri zasuku vzvodov 7, 7’v zaklenjeni položaj ključavnice (sl. 2) zob 16 zdrsne vzdolž stranice 17 zaustavijalnega elementa 10 in zaskočno naleže na končno ploskev 18 elementa 10 in s tem zadrži vzvoda 7, 7’ v zaprtem položaju ključavnice. Končna ploskev 18 je pri tem zasnovana tako, da se element 10 pod vplivom vzmeti 14 lahko še suka, pri čemer konec zoba 16 drsi vzdolž tega elementa, tako da se vzvod 7 suka vse dotlej, da sedež 8 tega vzvoda trdo naleže na naletni element 4, ki se nahaja v izrezu 5, s čimer se element 4 vpne med sedeža 8.The screw spring 14 of the stop element 10 is suspended with one end on the tongue 13 of the stop element 10, and with the other end is connected to the supporting structure 2 of the lock, so that the stop element 10 and the lever 7 are rotated in relation to FIG. 1 counter-sense in the open position of the lock. The stop element 10 and the tooth 16 are designed such that, in the open position of the lock (Fig. 1), the lateral edge of the tooth 16 rests on the longitudinal side 17 of the stop element 10, but when the levers 7, 7 ' are locked in the locked position (Fig. 2) the tooth 16 slides along the side 17 of the stop element 10 and snaps into place on the end face 18 of the element 10, thereby retaining the levers 7, 7 'in the closed position of the lock. The end face 18 is designed in such a way that the element 10 can be rotated under the influence of the spring 14, with the end of the tooth 16 sliding along this element so that the lever 7 rotates until the seat 8 of this lever is firmly attached to the contact element. 4, which is located in the recess 5, thereby securing the element 4 between the seats 8.

Za odklepanje ključavnice so predvidena neprikazana odpiralna sredstva, ki zasučejo zaustavijalni element 10 v glede na sl. 2 urinem smislu, pri čemer se končna ploskev 18 odmakne od zoba 16. Neprikazano odpiralno sredstvo (npr. gumb} pritisne na jezik 10a, s katerim je opremljen zaustavijalni element 10. Tedaj sta element 10 in vzvod 7 pod vplivom vzmeti 14 prosto zasučna v protiurinem smislu v odprti položaj ključavnice. Pri tem vzdolžni rob 17 zaustavijalnega elementa 10 naleže na prosti rob zoba 16 in zasuka vzvod 7’, katerega sestavni del je zob 16, v urinem smislu za odpiranje ključavnice.Unlocked opening means are provided for unlocking the lock which rotate the stop element 10 according to FIG. 2, with the end face 18 moving away from the tooth 16. The open opening means (eg, a button} presses on the tongue 10a, which is provided with the stopping element 10. Then the element 10 and the lever 7 are freely rotated under the influence of the spring 14. In this case, the longitudinal edge 17 of the stopping element 10 rests on the free edge of the tooth 16 and rotates the lever 7 ', of which the tooth 16 is integral, in an urgent manner to open the lock.

Vzvod 7 je zasnovan z grebenom 7a, ki štrli proti vzvodu 7’ in je prirejen za naleganje slednjega pri sukanju vzvodov 7, 7’ iz zakljenjenega v odprti položaj ključavnice, s čimer se olajša odpiralno gibanje.The lever 7 is designed with a ridge 7a projecting toward the lever 7 ' and is adapted to engage the latter when rotating the levers 7, 7 ' from locked to the open position of the lock, thus facilitating the opening movement.

Zavihtitev vzvodov 7, 7’ v njun odprti položaj je omejena z bočnima mejnikoma 19, na katera naležeta vzvoda 7,7’ v odprtem položaju. Nadaljnji mejnik 19’je predviden za omejevanje giba nja vzvodov 7, 7’v zaklenjenem položaju, ko naletni element 4 ni med sedežema 8. Mejnika 19 in mejnik 19’ so izvedeni kot iz plošče 2b štrleči jeziki, ki so izvedeni z izsekavanjem iz same plošC θ zi b ·The rotation of the levers 7, 7 'to their open position is limited by the lateral markers 19, to which the levers 7,7' are in the open position. A further landmark 19 ' is provided to limit the movement of the levers 7, 7 ' in the locked position when the contact element 4 is not between seats 8. The landmarks 19 and landmark 19 ' are made as projecting tongues from panel 2b, which are made by punching out of themselves plateC θ zi b ·

V plošči 2a je izveden sedež 21 (sl. 3) za sprejem in oporo pritrditve neprikazanega pritisnega gumba, ki deluje na jezik 10a zaustavijalnega elementa 10 za odpiranje ključavnice. Sedež 21 ima dve lokacijski izvrtini 22 za sprejem dveh zatičev, s katerima je opremljen pritisni gumb, s čimer je omogočeno fiksiranje gumba v natančnem položaju glede na nosilno konstrukcijo 2.In panel 2a, there is a seat 21 (Fig. 3) for receiving and supporting the attachment of a non-displayed push button acting on the tongue 10a of the stop element 10 for opening the lock. The seat 21 has two location bores 22 for receiving two pins, which are equipped with a push button, which allows the button to be fixed in the exact position relative to the supporting structure 2.

Delovanje ključavnice je takole:The operation of the lock is as follows:

Predpostavimo, da je ključavnica odprta (sl. 1); tedaj se zaklepanje ključavnice in s tem zaklepanje zadnjih loputastih vrat motornega vozila izvrši s tem, da se naletni element 4 premakne v notranjost izreza 5 v smeri puščice A, kar se zgodi pri zapiranju vrat. Ko pride naletni element 4 v dotik s sedežema 8, se vzvoda 7, 7’ zavihtita proti zaprtemu položaju (sl. 2). Konkretneje rečeno se vzvod 7, h kateremu je zasučno pritrjen zaustav ljalni element 10, zasuka po sl. 1 v urinem smislu, medtem ko se vzvod 7’ zasuka v protiurinem smislu. Medtem drsi zob 16 vzdolž roba 17 zaustavijalnega elementa 10 in zaskoči izza končne ploskve 18, s čimer blokira naletni element 4 med sedežema 8 vzvodov 7, 7’. Drsenje zoba 16 po končni ploskvi 18 pod vplivom vzmeti 14 zagotovi, da je vzvod 7’, ki je izveden z zobom 16, čvrsto pritis njen k naletnemu elementu 4, tako da se odpravi sleherno zračnost v zaklepalnem mehanizmu, do katere pride zaradi razlik v premeru naletnega elementa 4 bodisi zaradi obrabe ali izdelovalnih napak. Če hočemo ključavnico odpreti, pritisnemo gumb na vratih vozila in zasukamo zaustavijalni element 10 v urinem smislu, s čimer sprostimo ploskev 18 od uprijema z zobom 16, tako da se vzvoda 7, 7’ lahko zasukata proti odprtemu položaju. Pri vračanju v svoj odprti položaj vzvoda 7,7’izvajata pritisk na naletni element 4 v smeri iz izreza5.Assume that the lock is open (Fig. 1); then the lock of the lock and thereby the locking of the rear flap doors of the motor vehicle is accomplished by moving the impactor 4 inside the recess 5 in the direction of arrow A, which occurs when the door is closed. When the contact element 4 comes in contact with the seats 8, the levers 7, 7 'rotate towards the closed position (Fig. 2). More specifically, the lever 7, to which the stop element 10 is pivotally attached, is rotated according to FIG. 1 in the urine sense while the lever 7 'rotates in the urine sense. Meanwhile, the tooth 16 slides along the edge 17 of the stop element 10 and snaps behind the end face 18, thereby blocking the impact element 4 between the seats 8 of the levers 7, 7 '. The sliding of the tooth 16 along the end face 18 under the influence of the spring 14 ensures that the lever 7 ', which is made with the tooth 16, presses it firmly against the contact element 4, thus eliminating any play in the locking mechanism due to differences in the diameter of the impactor 4, either due to wear or manufacturing defects. To open the lock, push the button on the door of the vehicle and rotate the stop element 10 clockwise, thereby releasing the surface 18 from the contact with the tooth 16 so that the levers 7, 7 'can rotate towards the open position. When they return to their open lever position 7,7', they exert pressure on the starting element 4 in the direction from the notch5.

Čeprav je naletni element 4 v splošnem cilindričen, pa je prednostno zasnovan z odebeljeno glavo, tako da je preprečeno aksialno zdrsnjenje iz območja vzvodov 7, 7’, ko je ključavnica zaklenjena.Although the collision element 4 is generally cylindrical, it is preferably designed with a bold head so as to prevent axial slipping from the lever region 7, 7 'when the lock is locked.

Ključavnico smo sicer opisali v zvezi z loputastimi zadnjimi vrati vozila, lahko pa jo uporabimo npr. tudi za zaklepanje prednjega pokrova motornega vozila.Although the lock was described in relation to the tailgate of the vehicle, it can be used e.g. also to lock the front cover of a motor vehicle.

fCNaveclba o n a jboljšem prijavitelju znanem načinu za gospodarsko izkoriščanje izumafCNaveclba on Our Best Applicant Known Way to Economically Utilize Invention

Vsi sestavni elementi ključavnice po izumu so iz ploče vine iz ogljikovega jekla. Vsak element je podvržen operaciji kar bonitriranja, ki poteka po italijanskem standardu UNI 5479, kakor tudi cinkanja, ki se izvaja po italijanskem standardu UNI 4721.All components of the lock according to the invention are made of carbon steel plate. Each element is subjected to the operation of rating, which is carried out according to the Italian standard UNI 5479, as well as galvanizing, which is performed according to the Italian standard UNI 4721.

Razdalja med osema 6 vzvodov 7, 7’ znaša okoli 26 mm. Skupna širina sklopa po sl. 1, merjeno v vodoravni smeri, znaša mm.The distance between the axles 6 of the levers 7, 7 'is about 26 mm. The total width of the assembly according to FIG. 1, measured in the horizontal direction, is mm.

Ker je ključavnica v risbah iz prijave risana v merilu so strokovnjaku na osnovi gornjih podatkov dana pravzaprav vsa navodila za realizacijo izuma.As the lock in the drawings in the application is drawn on a scale, the skilled person, on the basis of the above information, is actually given all instructions for realizing the invention.

Claims

A lock for a tailgate of a motor vehicle, characterized in that a locking lever is fixed to one side of the notch (5) by means of a central saddle notch (5) for the entry of the impactor (4) of the supporting panel (2b) of the supporting structure (2) (7), whose free end outside the cutout area (5) is articulated jointly with the stop element (10), while the locking lever (7 ') is pivotally mounted on the other side of the cutout (5), with the inlet element (4) ) enter separate seats (8) of the levers (7, 7 ') directed towards each other, and in the area below the separate seat (8) of the lever (7) facing the latter, the ridge (7a) formed on the opposite lever (7'), whose free-standing tooth (16) extends beyond the cut-out area (16) slidingly against the oscillating two-member element (10), the supporting end of which is supported by a spring (14) on the side of the lever (7) and the opposite end is connected to the unlocking language (lOa).