Abstract:
The inventive device comprises a seat which is situated in the device housing and which is provided for the insertion of an identification provider. A holding element located inside the seat engages with a lateral indentation of the identification provider. The opening of the seat is normally closed by a spring-loaded cover element. In order to create a functionally reliable and economic design, the invention provides that the cover element is configured as a pivotal flap which can pivot from the identification provider out of an outwardly pivoted position covering the opening of the seat and into an inwardly pivoted position inside the seat. A projection is provided on the outer side of the flap and functions as a holding element for the identification provider. A recess is arranged next to the seat for the inward pivotal movement of the flap. During insertion and removal of the information provider, the projection of the flap runs along the contour of the information provider and temporarily pivots the flap further back into an overturned position. A profiled control surface is transferred into an effective blocking position which limits the space for the inwardly pivoted position of the flap thus ensuring the engagement of the projection of the flap inside the indentation of the identification provider.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     In the case of mechanical keys with conventional wards and tumblers in the corresponding lock cylinder, the key can no longer be removed from the lock cylinder after it has been rotated when in the inserted position in the lock cylinder. The key can be inserted and removed only in the initial position of the lock cylinder. This effect is desired. This effect is not to be eliminated in the case of electronic keys which allow remote control. 
     2. Description of the Related Art 
     The invention is directed to a device for receiving and securing an identification provider such as an electronic key, in particular, for an ignition starter switch and/or a steering column lock of a motor vehicle, which cooperates with an electronic identification provider. The devices comprises a housing stationary within the vehicle which has at least one functional output such as a control shaft for the ignition starter switch or an electrical line to an ignition starter switch, and wherein the housing has a receptacle for insertion of the identification provider, wherein the identification provider has at least one lateral ward for a securing element provided within the receptacle, and wherein the opening belonging to the receptacle in the housing is closed by a spring-actuated cover element which upon insertion of the identification provider is pressed back against the spring force. This device can be arranged spatially separate from the steering column lock and/or an ignition starter switch but cooperates with these devices by means of mechanical or electrical connections. However, the device can also be combined with one or with both of these devices. In addition to these devices there may also be a separate actuator for starting the motor vehicle which actuator is an interactive connection with the device according to the invention, the ignition-starter switch and/or the steering column lock. 
     In a known ignition starter switch (DE 198 36 968 A1), which cooperates with an electronic key, an axially movable slide with an end plate is used as a cover element for the opening of the receptacle in the housing. 
     The slide is axially spring-loaded and is secured by end stops in a pushed-out position in which the opening is closed. The receptacle is positioned within a rotor within the housing. When the key is inserted, the rotor is transferred from a pre-determined rest position into different working positions in which the key can no longer be removed from the receptacle. This is achieved by locking pins guided in radial bores of the rotor which engage diametrically opposed cutouts in the inserted key in a rotational position deviating from the rest position of the rotor so that the key is secured in the inserted position within the rotor. Only in the rest position of the key the locking pins can be radially moved away from one another. In this ignition starter switch the securing elements for the key, on the one hand, and the cover element for the opening of the receptacle, on the other hand, are separate components which must be individually produced and mounted. This is cost-intensive. Operational disruptions of the separately acting elements add up. 
     SUMMARY OF THE INVENTION 
     The invention has the object to develop an operationally safe device of the aforementioned kind which can be produced in a cost-saving way. This is achieved according to the invention in that the cover element has a pivotably supported flap which is pivotable from an outer pivot position in which it closes the opening by means of the identification provider into an inner pivot position into the interior of the receptacle exposing the opening, that the flap at its exposed side has a projection which—in the inner pivot position—fits into the lateral ward of the identification provider and functions as a securing element for the identification provider, that the receptacle has a lateral recess, in that the flap during insertion and removal of the identification provider, by sliding of the projection onto the contour of the identification provider, can be pivoted farther back temporarily from its inner pivot position into an over-pivoted position, and that a control surface can be switched relative to the flap in its inner pivot position between a release position and a locking position, wherein the spatial area required for pivoting the flap farther into its over-pivoted position is free in the release position of the control surface but in the locking position is blocked and thereby secures the engagement of the projection of the flap in the ward of the identification provider. 
     The flap is loaded by a spring force. When the electronic key is removed, the flap is therefore secured in a closed position. Upon insertion and removal of the key, this spring force provides a snap-in effect which realizes a force-transmitting interaction between the inserted key and the projection of the flap. Upon switching of the control surface into its active locking position relative to the flap in its inner pivot position, a positive-locking interaction results. The projection on the flap engages then the lateral ward in the electronic key and secures thus its inserted position. Accordingly, the flap of the invention has a double function. It is firstly a cover element which, when the key is removed, closes the opening of the receptacle. The second function of the flap results because its projection at the same time is the securing element for the key. Therefore, it is only required to provide that the flap cannot be moved into the “over-pivoted position” mentioned above in those working positions of the lock which are to prevent its removal from the receptacle. This is ensured by the already mentioned control surface which blocks in its effective locking position a further pivoting of the flap into its over-pivoted position. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     Further measures and advantages of the invention result from the claims, the following description, and the drawings. In the drawings, the invention is illustrated with several embodiments. It is shown in: 
     FIG. 1 the device according to the invention in longitudinal section and the corresponding identification provider embodied as a key before insertion into the receptacle; 
     FIG. 2 a  in an illustration corresponding to FIG. 1 the insertion position of the key in the receptacle; 
     FIG. 2 b  a position during the transition between FIGS. 1 and 2 a;    
     FIGS. 3 a + 3   b  cross-sections of the device with inserted key along the stepped section line IIIa—IIIa of FIG. 2 a  in two different rotational positions of the key; 
     FIG. 4 in an illustration corresponding to FIG. 1 or FIG. 2 an alternative embodiment of the device; 
     FIG. 5 a cross-section of the key in FIG. 4 along the section line V—V; 
     FIG. 6 in an illustration analog to FIG. 4 a third embodiment of the device according to the invention; 
     FIG. 7 in a schematic illustration the use of a fourth embodiment of the device according to the invention as a key holder in connection with an electrical ignition starter switch and an electrical steering column lock for a motor vehicle; 
     FIG. 8 a longitudinal section of the device according to FIG. 7 before insertion of the key; 
     FIG. 9 in a plan view the arrangement of some components in the interior of the device illustrated in FIG. 8; 
     FIGS. 10 a + 10   b  in an illustration corresponding to FIG. 8 a portion of the device with inserted identification provider embodied as a key in two different positions of the locking-effecting component in the interior of the device; 
     FIG. 11 in a side view an identification provider embodied in the form of a credit card-like plate which can be used in such a device instead of the electric key illustrated in the embodiment of FIGS. 7 to  10   b;    
     FIG. 12 an alternative to the device illustrated in FIGS. 8 to  10   b  in a plan view in analogy to FIG. 9 onto the most important components, before insertion of the different type of identification provider illustrated in FIG. 11; and 
     FIG. 13 schematically in longitudinal section analog to FIG. 8 a portion of a further alternative device according to the invention. 
    
    
     DESCRIPTION OF PREFERRED EMBODIMENTS 
     In a first embodiment of FIGS. 1 to  3   b , a device  10  is illustrated where the device housing  11  has a receptacle  12  for insertion of an identification provider  30 . The identification provider is a so-called “electronic key” and cooperates in an electronic way with a steering column lock and/or an ignition starter switch. For this purpose, a transponder coil  13  arranged in the housing can be provided which electromagnetically determines the data electronically stored within the key  30 . 
     In the embodiment of FIGS. 1 through 3 b  the housing  11  comprises a rotor  15  and a stator  14 . The stator is comprised of a cylindrical housing mantle. Between the stator  14  and the rotor  15 , in addition to rotational stops, not illustrated in detail, locking elements  16  illustrated in FIG. 1 are provided which can secure the rotor  15  in certain rotational positions with a defined securing force. Two of these rotational positions are illustrated in FIGS. 3 a  and  3   b . FIG. 3 a  shows the rest position of the rotor  15  where the insertion and removal of the bit  31  provided on the key  30  is possible. In the drawings according to FIGS. 2 to  3   b  the inner configuration of the bit  31  is not illustrated but instead only indicated by cross-hatching. The bit  31  of the key  30  has at least one lateral ward  32  which can also be formed as a hole or as a recess on the wide side of the key but in the following will always be referred to as a “ward”. In the present case, the key  30  is to be used as a so-called “reversible key” so that the bit  31  has two identical, diametrically opposed wards  32 , as illustrated in FIG.  1 . 
     The receptacle  12  is positioned within the rotor  15 . With the key  30  removed, according to FIG. 1, the opening  17  of the receptacle  12  is closed by the flap  20 . This pivot position of FIG. 1 in the following will be referred to, for short, as the “outer pivot position”. The receptacle  12  is provided with a lateral recess  40  for the flap  20 . The space which is comprised of the actual receptacle  12  and the recess  40  is constricted to the inner width of the opening  17  provided in a cover. Accordingly, inner shoulders  18  for the flap  20  result which, on the one hand, function as an end stop for the flap  20  in the outer pivot position illustrated in FIG. 1 and, on the other hand, serve for providing a covered arrangement of the pivot axis  21  of the flap  20 . The flap  20  is subjected to the effect of a spring force illustrated by the arrow  23  in FIG.  1 . This spring force  23  is exerted by a spiral coiled spring  24  of a two-leg configuration arranged on the pivot axis  21 . This spiral coiled spring  24  has the tendency to secure the flap  20  in its outer pivot position of FIG.  1 . 
     The exposed side of the flap  20  is provided with a projection  22  which has a complementary profile matched to the aforementioned lateral ward  32  of the key  30 . The projection  22 , as is illustrated by means of the second embodiment illustrated in FIG. 4, is arranged at a radial spacing  26  relative to the pivot axis  21  and is positioned, according to FIG. 1, in the longitudinal center of the opening  17 , approximately in alignment with the axis of the device indicated by a dash-dotted line in FIG.  1 . The axis  19  is also the rotational axis of the described rotor  15 . 
     Upon insertion of the key  30  in the direction of arrow  33  of FIG. 1, the flap  20  is pivoted against its spring load  23  into the interior of the receptacle  12  and will reach, when the key  30  is completely inserted according to FIG. 2 a , the position  20 ′ illustrated therein which position  20 ′ is referred to in the following as the “inner pivot position”. In this inner pivot position  20 ′ the flap covers only the first area of the cutout  40  identified with  41 . In this connection, the flap projection  22  engages one of the two wards  32  of the key  30 . During insertion  33 , as can be seen in FIG. 2 b , the flap must be pivoted back into the position identified with  20 ″ so that the projection  22  can glide across a peripheral contour  34  of the key bit  31  having a greater width. As can be seen in FIG. 2 b , for this purpose the flap  30  must be pivoted back past the first spatial area  41  of the recess  40  into the adjoining secondary area  42 . This farther-back pivot position  20 ″ of the flap of FIG. 2 b  will be referred to in the following as the “over-pivoted position”. 
     As can be also seen in FIG. 2 b , the recess  40  in the rotor  15  extends in a radial bore  43  of the rotor up to a profiled inner surface  44  of the aforementioned housing mantle  14 . In this bore  43  a control member  35  is arranged which in this embodiment is comprised of a loose control pin  35  which is facing with its radial outer end  36  the inner surface  44 . This outer end  36  is rounded. The bore  43  is stepped and, like the control pin, is provided with a thicker head so that the cooperating end stops result which are illustrated in FIG. 2 b  at  37 . By means of the end stops  37  the control pin  35  is secured in a defined axial position illustrated in FIG. 2 a  where its radial inner end  38  projects into the aforementioned second area of the recess  40 . Expediently, the inner end  38  of the control pin is located at the boundary to the first spatial area  41  of the recess  40 . As illustrated in FIG. 2 a , the spatial area  41  required for the inner pivot position  20 ′ of the flap is limited. The respective axial position of the control pin  35  is determined by the special profile of the already mentioned inner surface  44  of the housing mantle  14  which thus constitutes a “control surface” for this pin  35 . 
     As already mentioned, the rotor  15  can be rotated by the inserted key  30  from its rest position illustrated in FIG. 3 a  into at least one further working position according to FIG. 3 b  in the direction of arrow  27 . When doing so, the flap positioned in its inner pivot position  20 ′ and the control pin  35  are entrained. The aforementioned profile of the control surface  44  of the housing mantle  14  is comprised of a radial depression  45  which is aligned in the rest position of FIG. 3 a  with the outer end  36  of the control pin  35 . The adjoining areas of the control surface  44  are formed by the unchanged hollow cylinder surface  46  of the housing mantle  14  and act therefore as a “radial projection”. In the working position of FIG. 3 b  the control pin  35  has reached with its outer end  36  a position in front of this radial projection  46  and is therefore locked in the described position penetrating the spatial area  42 . The radial inner end  38  of the control pin  35  is supported on the flap which is in its inner pivot position  20 ′ and prevents its further pivot movement to the over-pivoted position  20 ″ of FIG. 2 b . Accordingly, the engagement of the projection  22  of the inwardly pivoted flap  20 ′ in the ward  32  of the key bit  31  is ensured. The hollow cylinder area  46  of the control surface  44  generates thus an effective “locking position” for the control pin  35  which blocks the flap in its inner pivot position  20 ′. 
     However, the key  30  can be removed from the device  10  only when it is rotated back in the direction of the counter arrow  27 ′ to such an extent that the rotor  15  is in its rest position of FIG. 3 a . Now the radial outer end  36  of the control pin  35  is aligned with the radial depression of the control surface  44  embodied as an inner groove  45 . Upon removal of the key  30  in the direction of arrow  33 ′ of FIG. 2 b  the projection  22  is radially pushed away by the slanted surfaces of the ward  32 . The flap then reaches its over-pivoted position  20 ″. The control pin  35  is moved with its outer end  36  into the inner groove  45 . Then the projection  22  of the flap  20 ″ which has been pivoted farther can glide along the peripheral contour  34  of the key bit  31 . In the rest position of the rotor  15  the control pin is thus in its “release position”. This release position allows a radial movement of the control pin  35  according to FIG.  1  and FIG. 2 b.    
     Expediently, the device  10  is moreover provided with a sensor  39 , which monitors the complete insertion position of the key bit  31  in the receptacle  12 . It can be comprised of, for example, an axially slidable slide member  39  which penetrates through a bottom opening into the receptacle  12  and can be pushed back in the direction of the double arrow indicated in FIG. 1 by the end face of the key bit  31  from the “key out” position illustrated in solid lines into the “key in” position indicated in dashed lines. This is realized in FIG. 2 a.    
     The second embodiment of the device  10  according to FIGS. 4 and 5 has substantially the same configuration as the lock of the first embodiment illustrated in FIGS. 1 through 3 b . Therefore, the same description applies. Only the differences need to be discussed. 
     The difference of the device  10  of the second embodiment of FIGS. 4 and 5 resides primarily in that instead of the separate free control pin  35  the flap  20  therein is provided with a control pin  25  formed on its backside. In this case a foldable module  50  comprised of the flap  20 , the projection  22 , and the control pin  25  is present. In FIGS. 4 and 5 the inner pivot position  50 ′ of the module is illustrated in dash-dotted lines. In this case, the radial outer end of the control pin  25  projects into a radial penetration  43 ′ of the rotor  15  and then is aligned with the inner groove  45  of the control surface  44 , also present here, in the interior of the housing mantle  14 , when the rest position of the rotor  15  illustrated in FIGS. 4 and 5 is present. 
     FIG. 6 shows a modification of the device according to FIGS. 4 and 5. The difference in FIG. 6 resides in that two of the aforementioned modules  50  are provided which in their outer pivot position illustrated in solid lines cover one half of the opening  17  of the receptacle  12 , respectively. The two modules  50  have pivot axes  21  which are separate from one another, and they are pivoted by insertion of the electronic key  30  in a mirror-symmetrical way relative to one another. They reach the two pivot positions  50 ′ illustrated in dash-dotted lines in FIG.  6 . 
     In FIGS. 8 to  10   b  a device  10 ′ formed as a “key holder” is illustrated which is also provided with a flap  20  in the area of the housing receptacle  12  but this receptacle  12  is stationary and is not a component of a rotor. The key holder  10 ′ can cooperate in the way illustrated in FIG. 7 with further devices  51 ,  53 . Even though mechanical connections could be present, in the present case electrical connections  47  between these devices  10 ′,  51 ,  53  are used. For this purpose, contact terminals  48  are provided in the correlated housing  11 ′ according to FIG.  8 . 
     The first device  51  of FIG. 7 is comprised of an electric ignition starter switch which has an actuator  54 . The actuator  54  serves for starting a motor, not illustrated in detail, of a motor vehicle. For this purpose, the actuator can be, for example, configured as a turn knob which can be actuated in the direction of the actuating arrow  56  indicated in FIG.  7 . The correct insertion position of the key  30  is monitored by a key-in contact  49  whose one contact leg is controlled, for example, by the axially movable slide member  39  described already in the previous embodiment. Before insertion of the key  30 , the contact  49  according to FIG. 8 is open. The completely inserted key according to FIG. 10 a  and  10   b  presses the slide member into the position  39 ′ which closes the contact  49 . Now an identification between the key  30  and the key holder  10  can be realized electronically or magnetically, which, for example, can be made possible by the transponder coil  13  which is illustrated in FIG.  8 . 
     Upon insertion of the key  30 , in this case the flap is also pivoted back from the outer pivot position  20  illustrated in FIG. 8 into the inner pivot position  20 ′ so that again engagement of the projection  22  of the flap with the ward  32  of the key is provided. For engagement and disengagement of the key  30 , the flap  20  is also briefly brought into the over-pivoted position according to FIG. 2 b  described in connection with the first embodiment. Accordingly, the above description applies. 
     The key holder  10 ′ is connected by a mechanical and/or electrical connection  47  with an electrical steering column lock  53 . This lock  53  locks by means of a locking member  57  the steering column  29  according to FIG. 7 when the key  30  has not been inserted in the direction of arrow  33  into the lock  10 ′. The ignition starter switch  51  and the steering column lock  53  can be combined with one another in a constructive unit. 
     A further difference of the key holder  10 ′ of FIG. 8 to FIG. 10 b  relative to the previous variants  10  of the lock according to FIGS. 1 to  6  resides in that the control surface is comprised of the control curve  61 ,  62  of a rotationally driven eccentric  60 . As can be seen especially well in FIG. 9, an electric motor  58  arranged in the housing  11 ′ is provided for driving the eccentric  60  which, by means of the worm  59 , drives the worm gear  63  fixedly connected with the eccentric  60 . The control curve on the eccentric  60  comprises a radially recessed curve portion  61  and a radially projecting curve portion  62  which is positioned diametrically opposite the recessed portion  61 . Usually, the eccentric  60  is in the rotational position illustrated in FIG. 8 to FIG. 10 a  where the recessed curve portion  61  points toward the hollow  40  adjacent to the receptacle  12 . Then the eccentric  60  is in its release position relative to the inner pivot position  20 ′ of the flap illustrated in FIG. 10 a . Then, as already described in connection with the device  10 , an insertion  33  and a removal  33 ′ of the key  30  from the lock  10  is possible easily. 
     Without the key the starter actuator  51  of FIG. 7 is ineffective; the motor of the vehicle cannot operate. When the proper key is inserted into the key holder  10 ′, an actuation of the actuator  54  of the ignition starter switch  51  is successful. This is controlled by an electronic evaluation device for the key code. In this connection, not only the aforementioned further devices  51 ,  53  are controlled in the required way, but also the step motor  58  is driven by a defined stroke. Accordingly, the eccentric  60  is rotated to such an extent that its radially projecting curve portion  62  moves into a position in front of the control cam  28  of the flap which is in its inner pivot position  20 ′. Then the electric motor  58  stops automatically. In this rotational position of the eccentric  60  the inwardly pivoted flap  20 ′ is clamped fast on the key  30  by the control cam  28  which is supported on the eccentric. Now an effective locking position of the eccentric  60  according to FIG. 10 b  is provided. As long as the motor vehicle is in operation, a removal of the key in the direction of arrow  33 ′ is blocked. A key removal is possible only when the motor vehicle motor has been switched off. Subsequently, a locking of the steering column  29  by the device  53  takes place. In order to secure the eccentric  60  in the blocking position of FIG. 10 b  or in the release position of FIG. 10 a , a locking element  65 , for example, in the form of a ball lock can be provided that cooperates with corresponding lock depressions at the lower end face of the worm gear  63 . 
     In FIGS. 11 and 12 a modification of the key holder  10 ′ is illustrated. For identifying the components the same previously used reference numerals are employed so that in this respect the previous description applies. It is sufficient to point out only the differences. 
     One difference resides in that, instead of the afore described remote control key  30 , a plate-shaped identification provider  30 ′ is used which has, for example, the format of a so-called credit card. As a result of this shape, several wards  32 ′ are expediently provided within the identification provider  30 . Because it is desired that this credit card  30 ′ be also used in a reverse position in the key holder  10 ′, on both lateral surfaces of the credit card  30 ′ two wards  32  are provided, respectively. The housing  11 ′ indicated in FIG. 12 has an opening  17  matched to the plate-shape of the credit card  30 ′ which opening is closed by the outer pivot position of the flap  20 . The flap  20  has at its exposed side two projections  22  correlated with the wards  32 ′ while at the backside a control cam  28  is arranged approximately at the plate center. As a function of the actuation of the starter button or the like, in this case the eccentric  60  is switched between the two already described active and inactive positions when the credit card  30 ′ is inserted into the key holder  10 , in analogy to FIGS. 10 a  and  10   b.    
     FIG. 13 shows a portion of the key holder  10 ′ in a modification relative to FIG.  8 . Only the changed means for switching the eccentric  60  are illustrated. The rotary actuator  52 , already mentioned in connection with FIG. 7, which acts here also onto an ignition starter switch  51 , is connected by a gear system  52 ,  55  with the eccentric  60 . The rotary actuator  54  is fixedly connected to the gear  52  which meshes with the gear  55 . This gear  55  is, in turn, fixedly connected to the eccentric  60 . A rotary actuation in the direction of arrow  56  then results in the described switching of the eccentric  60  with the curve sections  61 ,  62  that can be seen in FIG.  9 . 
     List of Reference Numerals 
       10  device 
       10 ′ key holder, device 
       11  housing of  10   
       11 ′ housing of  10 ′ 
       12  receptacle in  15  or  11 ′ 
       13  transponder coil 
       14  stator, cylindrical housing mantle 
       15  rotor 
       16  locking element between  14 ,  15   
       17  opening of  12   
       18  inner shoulder of  15   
       19  axis of device, rotational axis of  15   
       20  flap (in outer pivot position) 
       20 ′ inner pivot position of  20   
       20 ″ over-pivoted position of  20   
       21  pivot axis of  20   
       22  projection on  20   
       23  spring load, force arrow 
       24  spiral coiled spring for  23   
       25  control pin formed on  20  (FIGS. 4,  5 ) 
       26  radial spacing between  22 ,  21  (FIG. 4) 
       27  rotary arrow of  15   
       27 ′ counter rotary arrow of  15   
       28  control cam on  20  (FIG. 8) 
       29  steering column (FIG. 7) 
       30  identification provider, electrical key 
       30 ′ identification provider, credit card 
       31  key bit of  30   
       32  lateral ward in  30   
       32 ′ ward of  30  (FIG. 11) 
       33  insertion arrow for  30   
       33 ′ removal arrow of  30   
       34  peripheral contour of  31   
       35  control member, loose control pin (FIG. 1) 
       36  radial outer end of  35   
       37  axial end stop for  35   
       38  radial inner end of  35   
       39  sensor for  30 , axially movable slide member (“key out” position) 
       39 ′ “key in” position of  39   
       40  recess in  12   
       41  first spatial area of  40  for  20 ′ 
       42  second spatial area of  40  for  20 ″ 
       43  bore in  15   
       43 ′ radial penetration in  15  (FIGS. 4,  5 ) 
       44  control surface for  35  or  25 , inner surface of  15   
       45  radial depression in  44 , inner groove 
       46  radial projection of  44 , hollow cylinder surface 
       47  electrical connections at  50 ′ (FIG. 7) 
       48  contact terminal in  50 ′ 
       49  key-in contact 
       50  module comprised of  22 ,  25 ,  35  (in the outer pivot position) 
       50 - 40   inner pivot position of  50   
       51  first device, ignition starter switch (FIG. 7) 
       52  gear system, gear of  54   
       53  third device, electrical steering column lock (FIG. 7) 
       54  actuator of  51 , turn knob 
       55  gear system, gear  55   
       56  rotary actuation arrow of  54   
       57  locking member on  53   
       58  electric motor in  11 ′ 
       59  worm on  58   
       60  eccentric 
       61  control curve on  60 , radially recessed curve portion 
       62  control curve of  60 , radially projecting curve portion 
       63  worm gear 
       65  ball lock for  63