Abstract:
A device that has the double function of opening a lock upon actuation of a handle, and as the need may arise, of capturing the exterior of the vehicle in an image via a camera. A hole is provided in the back wall of a support shell receiving the handle, and the housing of a module is mounted on the hole. The camera is supported in a pivoting and translatory manner in the module housing via a camera mount between a retracting position and an extending position. Furthermore, a drive and a gear are mounted on the module housing for a rotational-translatory displacement of the camera.

Description:
BACKGROUND OF THE INVENTION 
     The invention concerns a device for opening a lock. This device has a dual function. First, it serves for opening the lock, for which purpose a handle is hinged in a shell-like support, which is located in an opening of the exterior cladding of the body of the vehicle. This shell-like support will be referred to here simply as the “support shell”. The handle acts on the lock. 
     The additional function of the device is to acquire images of the area outside the vehicle. The camera used for this purpose is mounted on the rear wall of the support shell. When the camera is deactivated, the handle is in its closed position, in which it closes the shell opening of the support shell. When the camera is to be activated, the handle is moved into an open position. 
     DE 10 2004 050 297 A1 discloses a device of this type. In this case, the camera is mounted in a stationary way in the rear wall of the support shell. When the camera is active, the shell opening and the handle, which is in the open position, obstruct the field of view, so that the external area of the vehicle is not adequately acquired. 
     EP 1 529 688 A1 discloses a device of a different type, in which the camera is nonrotatably mounted on the rear side of a hinged protective element. When the protective element moves on its hinge, the camera swivels along with it. The use of a camera that swivels together with a protective element in this way in a device for opening a lock by means of a handle is difficult and has the disadvantage that during opening movements of the lock, the camera also runs out and can become soiled or damaged. In addition, the simultaneously moving camera increases the weight of the protective element, which means that greater torques are required to swing it out on its hinge. 
     SUMMARY OF THE INVENTION 
     The objective of the invention is to develop a reliable device for opening a lock, which has a compact design and carries out the two functions of lock opening and image acquisition in an optimal way. 
     The invention makes it possible to provide the device with the option of mounting a camera, which is why it can also be used in vehicles where it is only a matter of opening the lock, and image acquisition of the area outside the vehicle is not desired. This is possible, because, on the one hand, the handle can be moved on a hinge in the support shell in the usual way, and the hole in the rear wall of the support shell can also remain unused. Since the handle is mounted independently of the camera, it can be smoothly operated. However, if image acquisition is desired, then, in accordance with the invention, it is sufficient to mount the housing of the module in the hole of the rear wall of the shell. The camera is supported by a mount in the module housing in such a way that it can make both swiveling and translational movements. This mount will be referred to simply as the “camera mount”. The module also includes a drive unit, e.g., in the form of an electric motor or a gear unit. The module is completely preassembled and contains all of the elements required for the mechanical support and movement of the camera or its camera mount, together with the necessary electrical connections for signal transmission and power supply. 
     Because the invention provides rotational-translational means for the movement of the camera, a compact design of the camera in its retracted position is obtained. Specifically, in the retracted position, the camera can be turned away from a window in the module housing. This allows it to assume a space-saving longitudinal position inside the module housing. At the same time, however, the rotational-translational control mechanisms allow the camera, when it is in its extended position, to assume an inclined position inside the housing. The image-recording end of the camera then extends from the module housing and then can also extend from the shell opening of the support shell. 
     Normally, devices of this type are individually adapted to a vehicle type and have shapes and/or sizes that differ from one another. The invention makes it possible to assign a single modular unit to a large number of different types of the device, in which it is merely necessary to provide the rear wall of the associated support shell with a suitable hole for mounting the housing of the module of the invention. Because only a single model of a module can be used for many different devices, it can be produced in large numbers and thus very inexpensively. The module can be mounted in and dismounted from the hole of the rear wall of the shell quickly and easily. 
     Additional measures and advantages of the invention are specified in the dependent claims and the following description with reference to the drawings, which illustrate several specific embodiments of the invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  shows a perspective front view of the device of the invention, when it is mounted in the exterior cladding of a trunk lid of a vehicle, with its handle in the open position and a camera in its extended position. 
         FIG. 2  shows a section of the device of the invention, namely, a rear view of a support shell, on which the other part of the device of the invention, namely, a module, has not yet been mounted. 
         FIG. 3  shows a rear perspective view of the complete device consisting of the support shell and the module. 
         FIG. 4  shows a partially cutaway side view through the device of  FIG. 1  or  FIG. 3 , when the handle is in its open position, but a camera mount is not yet in its retracted position in a housing of the module. 
         FIG. 5   a  shows a view analogous to  FIG. 4  but in a different sectional plane, which also reveals the components located inside the module housing. 
         FIG. 5   b  is a graphic representation of the conditions illustrated in  FIG. 5   b.    
         FIG. 6   a  shows a sectional view that corresponds to  FIG. 5   a  with the handle still in its open position but with the camera now in its extended position in the module housing and with its image-recording end also extending from the shell opening of the support shell. 
         FIG. 6   b  is a graphic representation of the conditions illustrated in  FIG. 6   a.    
         FIG. 7  shows a perspective view of one side of the module before the module has been mounted on the support shell of the device and with the camera in its retracted position. 
         FIG. 8  shows a view analogous to  FIG. 7 , a perspective view of the module from the opposite side shown in  FIG. 7 . 
         FIG. 9  shows an exploded perspective top view of the parts necessary for the construction of the module. 
         FIG. 10  shows the module in a perspective side view analogous to  FIG. 7 , when the camera is in its extended position and the associated gear unit is in the corresponding position. 
         FIG. 11  shows, in a view that corresponds to  FIG. 10 , an embodiment of the module that is an alternative to the first embodiment illustrated in the preceding  FIGS. 3 to 9 . 
         FIG. 12  shows a perspective top view of a second alternative for the design of a module of the device of the invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     As  FIGS. 1 ,  2 , and  4  show, the device of the invention includes a shell-like support  10 , which, as was noted earlier, will be referred to as a “support shell”. As  FIG. 1  shows, this support shell is mounted in an opening  16  of the exterior cladding  17  of a moving part of the automobile body of a vehicle, which in the present case is a trunk lid  15 . 
     A handle  20  is hinged on an axis  11  in the support shell in such a way that it can move in the direction of the hinge rotation arrow  21  of  FIGS. 4 and 6   b . In the unactuated closed position  20 . 1 , which is shown in  FIG. 5   b  and illustrated by an auxiliary line, the handle  20  closes a shell opening  12 , which faces the opening  16  of the exterior cladding  17 . When the handle  20  is operated, it moves into the open position seen in  FIG. 4 , which is designated in  FIG. 6   a  by the auxiliary line  20 . 2 . The handle  20  is acted upon by a spring force (not shown), which strives to move the handle  20  into the closed position  20 . 1  shown in  FIG. 5   b.    
     The handle  20  is operated by pushing it in the direction of arrow  22 , which produces the aforementioned hinge rotational movement  21 . During this movement, the upper region of the handle  20  moves into the interior  13  of the support shell  10 , while the lower region of the handle swings out of the support shell  10 . In the open position  20 . 2  of  FIG. 4 , a shoulder  24  pushes against an actuator  14  of an electric switch  18 .  FIG. 4  also shows the contact pins  19  of this switch  18 , which are cast after the switch is mounted in the support shell  10 . As  FIG. 2  shows, a plug connector  26  for the switch  18  is injected on the rear wall  23  of the support shell  10 . The contact pins  19  are electrically connected with the drive unit of a lock (not shown), which opens in the open position  20 . 2  of the handle  20 . The trunk lid  15  can then be swung upward with respect to the stationary part of the automobile body. 
     As  FIG. 2  shows, the rear wall  23  of the support shell  10  has a hole  25 , in which a module  30 , which is shown in detail in  FIGS. 7 to 10 , can be optionally mounted. For this purpose, the housing  33  of the module  30  is provided with mounting brackets  45 , which are best seen in  FIGS. 7 and 8 . The module  30  is bolted to the rear wall  23  of the support shell  10  by means of these mounting brackets  45 . An important component of the module  30  is an electronic camera  31 , which, as shown in  FIG. 5   a , is held by a mount  32 . As has already been mentioned, the holder  32  will be referred to here as the “camera mount”. 
     The module  30  comprises, first of all, a housing  33 , which shall be referred to here simply as the “module housing”. The module housing  33  has the form of a sleeve with a rectangular profile, which consists of a front sleeve wall  33 . 1  and, as is shown best in the exploded view of  FIG. 9 , a first sidewall  33 . 2  and rear wall  33 . 3 , which are formed as a single piece with the front wall  33 . 1 . The end of the rear wall  33 . 3  has a flanged strip for connecting the rear wall  33 . 3  to the second sidewall  33 . 4 . As  FIG. 5   a  shows, the housing interior  35  contains the camera  31 , which is held in the camera mount  32 . The camera  31  can be rotated together with the camera mount  32  on an axis of rotation  35 , but at the same time it can also be moved translationally with its axis of rotation, as is illustrated in detail in  FIGS. 5   a  and  6   a.    
     In  FIG. 5   a , the camera mount  32  with its axis of rotation  34  is in an inactive position, as indicated by the auxiliary line  32 . 1 . In this position, the camera  31  is in a space-saving longitudinal position in the interior  35  of the housing, in which its image-recording end, indicated by the objective  36 , is turned away from a window  37  in the front wall  33 . 1  of the sleeve. The camera  31  is then located in a retracted position in the housing interior  35 , as illustrated by the auxiliary line  31 . 1 . In this position, the window  37  is covered by a cover  38 . 
     In this embodiment, the cover  38  is rotatably supported at  39  and is acted upon by a spring  27 . The spring  27  acts to keep the cover  38  pressed against the window  37  of the modular housing  33 . A gasket  28 , which can be seen in  FIGS. 7 to 9 , is arranged between the face of the window  37  and the cover  38 . It tightly seals the interior  35  of the housing  33  from the interior  13  of the support shell  10  when the cover  38  is in its closed position, which is shown in  FIG. 5   a.    
     Starting from the inoperative position  32 . 1  of the camera mount  32  with the camera  31  in its retracted position  31 . 1 , as shown in  FIG. 5   a , the conditions illustrated in  FIG. 6   a  are obtained after the combined rotational-translational movement. The camera mount  32  then arrives in the operative position indicated by the auxiliary line  32 . 2 . This would be a rotational movement of the camera mount  32  in the direction of the path  32 . 3  drawn in  FIG. 6   a . During this movement, the camera mount  32  also carries out a back rotation  32 . 4  about its axis of rotation  34 , which results in the extended position of the camera  31  indicated in  FIG. 6   a  by the auxiliary line  31 . 2 . 
     Since the inoperative position  32 . 1  shown in  FIG. 5   a  is also shown in  FIG. 6   a , one sees not only the rotation  32 . 4  and the swiveling movement  32 . 3  but also a translational component  32 . 5  of the overall movement of the camera mount  32 . The image-recording end  36  of the camera  31  extends not only from the module housing  33  but also from the shell opening  12  of the support shell  10 . In the extended position  21 . 2 , a large field of view  29  of the camera is obtained, as shown in  FIG. 6   b . In the extended position  31 . 2 , the camera is approximately parallel to the open position  20 . 2  of the handle  20 . 
     During the rotational movement  32 . 3  of the camera mount  32 , the cover  38  is also moved out of its closed position indicated in  FIG. 5   b  by the auxiliary line  38 . 1  into its open position indicated by auxiliary line  38 . 2  in  FIG. 6   b . This could be immediately accomplished by supplementing the gear unit that is used to move the camera mount and that will be described in greater detail below. In the present case, this is carried out directly by the camera mount  32 , namely, by an actuator  46  provided there, which is designed, for example, as a projection  46  on the camera mount  32 , as shown in  FIG. 6   a . When the camera mount  32  is swiveled, the projection  46  pushes against the inner surface of the cover  38  and lifts it against the aforementioned spring tension of the cover spring  27  of  FIG. 7  until it reaches the open position  38 . 2  shown in  FIG. 6   b . As long as the camera  31  is in its extended position  31 . 2  of  FIG. 6   a , the cover  38  is maintained in its open position  38 . 2 . 
     The drive for the rotational-translational movement of the camera  31  is provided by an electric or hydraulic drive unit. In the present case, an electric motor  50  is used for this purpose. It is part of the module  30  according to  FIGS. 7 to 9 . The motor  50  is bolted to the outside of the second sidewall  33 . 4  of the module housing  33  by means of bolts and spacers  51 . In the space separating the motor  50  and the sidewall  33 . 4 , there is a gear drive  32 ,  33 , which is driven by the motor shaft shown in  FIG. 9 . An input gear  32  is mounted on the motor shaft and meshes with an output gear. A double-arm lever  54  to  56  is connected on the output side of the output gear  53 . The details of this double-arm lever are shown in  FIGS. 9 ,  7 , and  6 . A first arm  54  of this double-arm lever has a longitudinal guide  57  for a guide element  58 , which is mounted like a crank on the output gear  53 . This first arm  54  is nonrotatably connected with a second arm  56  of this double-arm lever by means of a bearing shaft  55 , which is supported in bearing holes of the sidewalls  33 . 4 ,  33 . 2  of the module housing. The second arm  56  is mounted in the interior  35  of the housing, and its free end articulates with the inner end of the camera mount  32  by means of a joint pin  59 . To this end, as  FIG. 9  shows, a bushing is formed at the free end of the arm  56 . This bushing receives the pin  59  and is mounted between a forked inner end of the camera mount  32  by means of the joint pin  59 . 
     The forked inner end of the camera mount  32  is provided with two pivot pins  20 , one of which can be seen in  FIG. 9 . The two pivot pins  35  determine the aforementioned axis of rotation of the camera mount  32 . In the present embodiment, the axis of rotation is combined with a two-part connecting link guide  40 . 1 ,  40 . 2 , which are located in the two opposite sidewalls  33 . 2  and  33 . 4  of the module housing  33  and are shown best in  FIGS. 7 and 8 . Each of the two connecting link guides  40 . 1 ,  40 . 2  has a slotted link  41 . 1 ,  41 . 2 , which is sunk as a slot in the corresponding sidewall  33 . 2 ,  33 . 4  and in which corresponding sliding blocks  42 . 1 ,  42 . 2  slide. On the one hand, the two sliding blocks  42 . 1 ,  42 . 2  have a sleeve-like design and receive the aforementioned pivot pins of the camera mount that serve as the axis of rotation  34 . On the other hand, the two sliding blocks  42 . 1 ,  42 . 2  have a roller-like circumference, which facilitates their movement in the corresponding slotted links  41 . 1 ,  41 . 2 . As is seen especially well in  FIG. 6   a , the slotted links  41 . 1 ,  41 . 2  consist of circular ring groove segments, which are arranged coaxially to the bearing shaft  55  of the double-arm lever. This gear unit produces, by means of the motor  50 , the rotational-translational movement of the camera  31 , which has already been described in detail, as the camera  31  moves between its retracted position  31 . 1  of  FIGS. 4 ,  5   a  and its extended position  31 . 2  of  FIGS. 6   a ,  6   b.    
     So that the camera  31  can be extended, it is advisable to provide for an opening movement  45  of the handle  20  by motor. The closing movement of the handle  20  in the opposite direction can then be brought about by the aforementioned spring tension. Naturally, the same motor  50  that is used for the aforementioned rotational-translational movement of the camera mount  32  should also be used for this rotational movement about the hinge. In this connection, the motor  50  is provided with two gear outputs (not shown) or suitable double couplings, one of which is used for the control movement of the camera mount  32 , while the other is used for the rotational movement about the hinge. These movements can be started at the beginning of the camera activation and ended after deactivation of the camera  31 . To initiate these movements, the cover could be provided with control devices, which produce the opening movement of the handle  20  in the support shell  10  during the swiveling movement of the cover  38  shown in  FIG. 6   b . The movement in the opposite direction to close the handle could be managed by suitable means. The simplest solution is for these control devices to comprise a shoulder  65  on the cover  38  and a cooperating shoulder  66  on the handle  20 , as shown in  FIG. 6   a.    
       FIG. 11  shows a second embodiment of the invention in the form of an alternative module  61  in a view analogous to the view in  FIG. 10  of the first embodiment of the module  30 . Only the differences will be described. In all other respects, the description of the first embodiment of the module  30  also applies here. 
     Instead of the second arm  56  provided in module  30 , a gear  43  that meshes with an output gear  44  is installed in module  61 . This output gear  44  in turn is nonrotatably connected with a bearing shaft  55  of the aforementioned lever arm  56 . As in the first embodiment  30 , this lever arm  56  articulates with the camera mount  32 . Thus, in this second embodiment  61 , the first arm  54  is merely replaced by the new output gear  44 . 
       FIG. 12  shows a third embodiment  62  of the module, which has a differently designed gear unit for the rotational-translational movement of a camera  31 ′ and its camera mount  32 ′. In this case as well, a motor  50 ′ is connected with some separation to a sidewall  33 . 1  of a module housing  33 ′, which has a U-shaped housing profile. An input gear  52 ′, which meshes with a toothed quadrant  53 ′, is mounted on the shaft of the motor  50 ′. The toothed quadrant  53 ′ is nonrotatably connected with an arm  47  in the interior  35 ′ of the housing by means of its rotatably supported shaft  55 ′. The end of the arm  47  fits into the inner space of a fork end  49 , which is part of the camera mount  32 ′. The rotational-translational movement of the camera  31 ′ is controlled by a double link drive  60 . 1 ,  60 . 2 , whose motional impulse originates from the lever arm  47 . 
     In this case as well, the two link drives  60 . 1 ,  60 . 2  have a two-part design and are located in the two sidewalls  33 . 1 ′ and  33 . 2 ′. Naturally, the two opposing parts of the two link drives  60 . 1 ,  60 . 2  are designed identically to each other. Therefore, it is sufficient to describe the parts of one drive or the other which are visible in  FIG. 12 , and, of course, this description applies to both alike. First of all, the two link drives  60 . 1 ,  60 . 2  have two slots  63 . 1 ,  63 . 2  in the two sidewalls  33 . 1 ,  33 . 2 . The two slots  63 . 1 ,  63 . 2  have different shapes, are offset in height, and serve as slotted links for roller-like sliding blocks  64 . 1 ,  64 . 2 . These roller-like sliding blocks  64 . 1 ,  64 . 2  are seated on the outside of the two fork legs of the fork end  49  of the camera mount  32 ′ and form two independent swivel points for the common swiveling movement of the camera  31 ′. The camera  31 ′ is rotationally-translationally moved between its retracted position shown in  FIG. 12  and an extended position (not shown) outside of the module housing  33 ′. The latter is of independent inventive significance. 
     LIST OF REFERENCE NUMBERS 
     
         
           10  shell-like support, support shell 
           11  axis of  20   
           12  shell opening of  10   
           13  interior of  10  ( FIG. 6   a ) 
           14  actuator of  18  ( FIG. 4 ) 
           15  trunk lid ( FIG. 1 ) 
           16  opening in  17  ( FIG. 1 ) 
           17  exterior cladding of  15  ( FIG. 1 ) 
           18  electric switch ( FIG. 4 ) 
           10  contact pins of  18  ( FIG. 4 ) 
           20  handle 
           20 . 1  closed position of  20 , unactuated ( FIG. 5   b ) 
           20 . 2  open position of  20 , actuated ( FIGS. 4 ,  6   b ) 
           21  hinge rotation arrow of  20  ( FIGS. 4 ,  6   b ) 
           22  push operation of  20  ( FIG. 5   b ) 
           23  rear wall of  10  ( FIG. 2 ) 
           24  shoulder on  20  for  14   
           25  hole in  23  ( FIGS. 2 ,  5   b ) 
           26  plug connector for  18  ( FIGS. 2 ,  3 ) 
           27  spring for  38  ( FIG. 7 ) 
           28  gasket for  38  ( FIG. 7 ) 
           29  field of view of  31  in  31 . 2  ( FIG. 6   b ) 
           30  module, first embodiment ( FIGS. 7 to 10 ) 
           31  camera of  30  ( FIG. 5   a ) 
           31 ′ camera of  62  ( FIG. 12 ) 
           31 . 1  retraction movement of  31  ( FIG. 5   a ) 
           31 . 2  extension movement of  31  ( FIGS. 6   a ,  6   b ) 
           32  mount for  31 , camera mount ( FIG. 5   a ) 
           32 ′ camera mount of  62  ( FIG. 12   
           32 . 1  inoperative position of  32  ( FIG. 6   a ) 
           32 . 2  operative position of  32  ( FIG. 6   a    
           32 . 3  path of the swiveling movement of  32  ( FIG. 6   a ) 
           32 . 4  arrow of the back rotation of  32  ( FIG. 6   a ) 
           32 . 5  translational component of the path of  32  ( FIG. 6   a ) 
           33  module housing of  30  ( FIGS. 4 to 9 ) 
           33 ′ module housing of  62  ( FIG. 12 ) 
           33 . 1  front sleeve wall of  33  ( FIGS. 8 ,  9 ) 
           33 . 1 ′ first sidewall of  33 ′ ( FIG. 12 ) 
           33 . 2  first sidewall of  33  ( FIGS. 8 ,  9 ) 
           33 . 2 ′ second sidewall of  33 ′ ( FIG. 12 ) 
           33 . 3  rear wall of  33  ( FIGS. 8 ,  9 ) 
           33 . 4  second sidewall of  33  ( FIGS. 6   a ,  9 ) 
           34  pivot pin on  32 , axis of rotation ( FIGS. 6   a ,  9 ) 
           35  interior of housing  33  ( FIGS. 5   a ,  9 ) 
           35 ′ interior of housing  33 ′ ( FIG. 12 ) 
           36  image-recording end of  31 , objective ( FIGS. 5   a ,  6   a ) 
           37  window in  33 . 2  ( FIG. 5   a ) 
           38  cover for  37  ( FIGS. 7 ,  9 ) 
           38 . 1  closed position of  38  ( FIG. 6   b ) 
           38 . 2  open position of  38  ( FIG. 6   b ) 
           39  swivel bearing of  38  ( FIGS. 8 ,  9 ) 
           40 . 1  connecting link guide, first part at  33 . 4  ( FIGS. 7 ,  9 ) 
           40 . 2  connecting link guide, second part at  33 . 2  ( FIGS. 8 ,  9 ) 
           41 . 1  slotted link in  33 . 4  ( FIG. 9 ) 
           41 . 2  slotted link in  33 . 2  ( FIGS. 8 ,  9 ) 
           42 . 1  sliding block in  41 . 1 , swivel bearing mount for  34  ( FIGS. 6   a ,  9 ) 
           42 . 2  sliding block in  41 . 2 , swivel bearing mount for  34  ( FIGS. 6   a ,  9 ) 
           43  middle gear in  61  ( FIG. 11 ) 
           44  output gear in  61  ( FIG. 11 ) 
           45  mounting bracket ( FIGS. 7 ,  8 ) 
           46  actuator on  32  for  38  ( FIG. 6   a ) 
           47  lever arm on  55 ′ ( FIG. 12 ) 
           48  path of swiveling movement of  38  ( FIG. 6   b ) 
           49  fork end of  32 ′ ( FIG. 12 ) 
           50  motor of  30  ( FIG. 7 ) 
           50 ′ motor of  62  ( FIG. 12 ) 
           51  spacer for  50  ( FIG. 7 ) 
           52  input gear of the gear drive of  30  ( FIGS. 7 ,  9 ) 
           52 ′ input gear of the gear drive of  62  ( FIG. 12 ) 
           53  output gear of the gear drive in  30  ( FIGS. 7 ,  9 ) 
           53 ′ toothed quadrant of the gear drive in  62  ( FIG. 12 ) 
           54  first arm of a double-arm lever ( FIGS. 9 ,  7 ) 
           55  bearing shaft of the double-arm lever ( FIGS. 6 ,  7 ,  9 ) 
           55 ′ bearing shaft for  53 ′,  47  ( FIG. 12 ) 
           56  second arm of the double-arm lever ( FIGS. 6 ,  9 ) 
           57  longitudinal guide for  58  in  54 , guide ( FIGS. 9 ,  10 ) 
           58  guide element on  53  for  57  ( FIG. 9 ) 
           59  joint pin for  56  on  32  ( FIGS. 6   a ,  9 ) 
           60 . 1  first link drive of  62  ( FIG. 12 ) 
           60 . 2  second link drive of  62  ( FIG. 12 ) 
           61  second embodiment of the module ( FIG. 11 ) 
           62  third embodiment of the module ( FIG. 12 ) 
           63 . 1  first slotted link of  60 . 1  ( FIG. 12 ) 
           63 . 2  second slotted link of  60 . 2  ( FIG. 12 ) 
           64 . 1  roller-like sliding block for  60 . 1  ( FIG. 12 ) 
           64 . 2  roller-like sliding block for  60 . 2  ( FIG. 12 ) 
           65  shoulder on  38  ( FIG. 6   a ) 
           66  cooperating shoulder on  20  ( FIG. 6   a )