DE1247840B - Camera with electromotive film transport and shutter lift - Google Patents

Description

Camera with electromotive Fihntranspört and shutter lift Die The present invention relates to an attachment for photographic cameras using an add-on coupling, which is used for manual operation of the film transport and film lift provided film key intervenes, as is known per se.

Also known are cameras with motor lift, especially for common motorized film transport and shutter lift for 'purely electrical actuation' the work in such a way that with the help of several series and parallel connected Contacts after each time the Fümtransport is triggered and the elevator is tensioned takes place by a motor, 'with the triggering only by hand or remote control via a three-pole line using a special relay. However, there is a great need for motor lift cameras for optional Manual and remote release can be used without the need for an additional relay and with an only bipolar. Line.

There are now cameras of this type already proposed in which the optional motor actuation of the shutter release by closing a contact The trigger from the motor via - mechanical, is initiated, although it has also already been proposed to be operated transmission means, but with optional manual operation the touch surface of the mechanical trigger is kept free and the shutter lift and the film advance in both cases is carried out by the electric motor. Both older Proposal of this type, however, a relay was needed that also had a holding contact aufwieä to bypass the actuation contact after the motor has started.

The present invention has set itself the task of already To simplify the earlier proposed facility and to make it easier to use as well as a cheaper and space and weight saving to achieve that when closing of the actuating contact, the motor is switched on immediately and this both the film advance and the shutter lift as well as avoiding relays carries out all necessary mechanical and electrical switchovers.

The triggering can be done either by hand or with the help of the elevator gear via an electrical, in particular remotely operated contact, which at the same time ensures that the entire device automatically returns to the standby position after each actuation. Sälbstverständ - -lich it is also possible not to incorporate the present invention as an additional device to use, but straight into the camera.

As a result> that the mechanical trigger is on an electrical contact acts, which is already actuated at the beginning of the mechanical release movement and then the release actuation via the release gear of the motor brings about automatically, the advantage is achieved that the hand of the user only has to apply the small force required to close a contact, - while the actual release forces are provided by the motor. This will Advantageously, the risk of shaking pictures is reduced. In an execution dorm the invention, the elevator motor during the release process, similar to the older proposal, controlled backwards, with the elevator gear disengaged is available while the full power of the motor is available for triggering stands. After the end of the triggering, the direction of rotation is reversed and carried out again of the elevator process. In another embodiment, the reversal of the Avoided motor and this only stopped and during the trigger actuation the release with the aid of a mechanical energy storage device previously loaded by the motor (Spring) brought about, whereupon the motor again after the shutter has closed starts, the film transport, the cocking of the shutter and the charging of the mechanical Energy storage brings about.

This embodiment makes it possible at the same time to avoid all dead times and to achieve a maximum number of series exposures in a given period of time. Further details and advantages of the invention are explained in more detail with reference to the figures, which show some exemplary embodiments. It shows F i g. 1 shows the front view of a camera according to the invention with an additional motor device, the latter in section, FIG . 2 the bottom view of the additional device after removing the protective cap, FIG . 3 shows a diagram of the most important mechanical and electrical switching means, FIG. 4 shows the diagram, partly in perspective, of a second embodiment of the invention, FIG . 5 to 7 each with a section from FIG. 4 with the corresponding position of the switching elements during the individual stages of a complete actuation circuit, F i g. 8 shows a modification of the example in FIG. 4 to 7, FIG. 9 a schematic installation plan of the contacts and mechanical transmission means.

In the figures, 1 is a camera housing that encloses a camera with a high-speed elevator and release lock, in which only the release 2, which can also be arranged on the front of the camera, is in front of the actuating means in the upper part of the camera, while an elevator key 3 for high-speed lift is located on the bottom of the camera. The rewind lever, which is sunk when not in use, does not play a role of its own in the present context and is therefore omitted from the drawing.

An additional housing 4 is attached to the underside of the camera housing 1 and has a pot-like recess 5 and two chamber-like recesses 6 and 7 , which are used to accommodate the motor 8 on the one hand, and the battery 9 on the other. In a further chamber 10 , the gears 11 and 12 of a transmission are housed.

The recess or chamber 6 is partially covered by a bridge 13 on which a bearing pin 14 and, through this, the switching lever 15, which is forced into the position shown by the spring 16 , and a tripod nut 17 are fastened. The tripod nut 17 is provided with an external thread onto which a ring nut 18 can be screwed, which serves to fasten the protective hood 19. The shift lever 15 has a longitudinal hole 20, which allows the shift and rotation of the shift lever 15 , as well as an obliquely angled hook-shaped end 21, which cooperates with the rounded tip or counter nose 22 at one end of a trigger arm 23 , whose in Fig. 3 left end when moving the shift lever 15 against the direction of spring tension 16 ,. in Fig. 3 is moved downwards and thereby takes the trigger rod 25 of the main camera with it via an intermediate arm 24. The intermediate rod 24 is hinged to the trigger rod 25 at 26. The connection with the trigger rocker 23 is made via a spring 27, one end of which is fastened at 28 to the intermediate rod 24, while the other end leads to a pin 29 of the rocker 23 . The pin 29 simultaneously engages in a limited guide slot 30 of the intermediate rod 24. The trigger arm 23 is pivotably mounted at 31 and actuates an electrical contact 33 with a nose 32. Furthermore, a catch arm 34 is provided at one end of the trigger arm 23, which has a nose 35 temporarily engages behind a contact spring 36 which, for structural reasons, can resiliently yield in two mutually perpendicular directions.

A lug 37 is also attached to the control arm 15 and is used to actuate the reversing contact arms 39, 40 which are mechanically connected to one another via an insulating rod 38.

In the figure is in the upper part! Part of the triggering device (trigger intermediate rod 24, rocker 23 including the hook-shaped end 35 and the left end of the control arm 15) shown in camera side view, while in the lower part of the figure, the control arm 15 shown a second time and a cam 45 engaging with this in the camera top view (F i g cf.. 1 and 2) marked 'by the motor 8 through the gears 11 and 12 coming movement is further transmitted via a shaft 41 and a pinion 42 on a pot-like crown 43rd The latter is supported by the shaft 44 in the housing 4 in the pot-like recess 5 and secured from the other side by the switching disk 45 to which it is firmly connected. The switching disk has two bevels 46, 47 and two steps or lugs 48, 49 ag which are each offset by 180 relative to one another and act on the lever 15 . In the bottom of the crown wheel 43, the two pins 50 and 51 are riveted, which take the switching handle 3 of the camera 1 in one direction of rotation.

The housing is fixed in its position by a raised edge 52 which is precisely matched to the lower shape of the camera 1. A knurled disk 53 penetrates the edge 52 of the housing 4 on the two long sides and is firmly riveted to a threaded pin 54, which can be screwed into the tripod thread 55 of the camera 1 and thereby, and especially through the positive engagement of the edge 33, a fixed connection between the camera and the motor add-on.

The vertical distance between the housing 1 and the motor attachment is established by the two ribs 56 and 57 . As can be seen, the additional housing can be attached and removed very easily, without any camera parts, handles or the like having to be removed or attached.

In the position shown ( FIG. 3) , the contact arm 39 is in conductive connection with a counter contact arm 58 and the contact arm 40 with a counter contact arm 59. The circuit for the motor is thus prepared in a certain polarity, but is still interrupted at point 33. If the trigger rod 25 is now actuated by hand, the contact 33 is closed in the first part of the way and the motor 8 starts up in the direction that the rear end of the control arm 15 rests against the stop 48 and from this in FIG. 3 is pressed to the left, wherein it is guided with the slot 20 on the pin 14. The slope 21 a at the end of the control arm 15 slips while completely inevitably or automatically depressing the left part of the trigger arm 23 and thus the rod 25 -over the slope 22 a at the left end of the trigger arm 23 until the nose 21 after the automatic spring back The rocker arm 23 and the trigger rod 25 engages behind the nose 22. The control arm 15 is held in this position. At the same time, the nose 37 of the control arm 15 has switched the contact arms 40 and 39 by acting on the slope 60 of the contact arm 40. As a result, the current direction of the motor is now reversed. The switchover is favored by the inertia of the motor, so that any brief power interruption during the switchover process is ineffective. With this new motor actuation, the right end of the control arm 15 is first raised with the help of the bevel 47 of the cam disk 45 until the left end of the control lever 15 passes the nose 22 of the trigger arm 23 laterally (in the upper half of FIG. 3 from the plane of the drawing) and pulled by the spring 16 snaps to the right until this movement is intercepted by the end of the slot 20 on the pin 14. While the motor continues to run in the same direction, the right end of the control lever 15 lies on the portion 61 of the disk 45 with the largest diameter and holds thereby that by turning the lever 15, the nose 37 continues to press on the contacts 40, 39 , the Connection with 58 or 36 continues until the right end 62 of the control arm 15 jumps in behind the nose 49 and thereby reverses the current path of the motor again and at the same time interrupts if contact 33 is interrupted or the trigger rod 25 is no longer operated by hand. However, in the event that the finger remains on the rod 25 when the trigger is triggered, the arm 34 with the nose 35 prevents the motor from starting in the winding direction by bringing the contact 36 out of the area of the mating contact spring 39 . This is done either by an additional stroke with mechanical deflection or if necessary laterally or out of the plane of the drawing, which can be advantageous because of the spatial offset of the control arm 15 and the rocker 23 from one another by 900 . In this case, the contact spring is cross-flexible.

A remote control switch 63 can also be arranged parallel to contact 33. If this remains closed, the actuation cycle repeats itself continuously "so that automatic serial recordings are also possible.

In the case of the FIG. The example shown in FIGS. 4 to 7 is also triggered by the elevator gear, however, not directly by the motor, but by an energy storage device in the form of a spring 64 which tries to pull the trigger control arm 65 to the left in the triggering direction. The spring 64 is tensioned with the aid of a side arm 66 of the control arm 65 through a cam disk 67, which consists of two equal halves offset by 1800 , according to the design of the camera, in which a full elevator movement is achieved when the handle 3 is rotated 180 ' (F i g. 1) is carried out. When released, the control arm 65 slides under the action of the spring in FIG. 4 to the left. For the purpose of triggering, similar to the example described first, the trigger rod 25 is inside. of the actual camera housing 1 with an extension rod 68 in engagement, which protrudes from the additional housing 4 accordingly. It can have a hinge at 69 so that it can be folded in when not in use and hidden in the housing 4 and is pulled to the left by a spring 70 so that the engagement with the release rod 25 remains secured. The cam 67 has on its circumference a double contact track 71, which has an insulating point at 72 in the area of a sliding contact 73 , while a second sliding contact 74 can have permanent metallic contact at least in the last part of the cam movement.

The in F i g. The position of the arrangement shown in FIG. 4 corresponds to the state shortly before a trip. The arm 66 is located just on the end of, Kurvengcheibe 67 and presses a contact lug 75 against the contact tab 74 so that the corresponding contacts 74 a, 75 a are closed .. The motor circuit is thus broken only at the isolation point 72nd A remote switching contact 76 and a manual release contact 77, which is closed via a rod 78 when the handle 79 is actuated, are located parallel to the contact lugs 73, 74. The arrangement is expediently such that the contact 77 is closed in the first part of the actuation path of the handle 79 and further movement of the handle 79 is prevented by the stop of the rod 78. On the other hand, the trigger rod 25 is only in loose, resilient contact with the handle 79 , so that it can also move away from it in order to trigger the shutter.

If one of the two contacts 76 or 77 is closed by hand, the interruption 72 is bridged and the motor starts up. The arm 66 derives from the cam disk 67 . Contact spring 75, which was previously pressed by arm 66 , is now released, but is soon supported on a rear stop 83 , but the motor circuit is interrupted, so that the elevator and the disc-67 again after their brief start-up stand still. The released trigger arm 65 moves in the meantime by the spring 64 to the left, closes over the bent nose 80 of the trigger extension rod 68 and pulls the latter and thus the trigger rod 25 into the trigger position. If the exposure time was correspondingly long, the rod 65 triggers, but does not yet move into its end position, but rather remains hanging on a latch 82 with a preferably slightly inclined projection 81 (FIG. 5, dashed position), which (in FIG not shown) is only moved vertically upwards when the shutter of the camera 1 is fully closed again or the shutter lift has returned to its position. The bolt 82 accordingly protrudes into the main housing 1 and is there with a member, not shown, dependent on the cover elevator, in a similar manner and, if necessary, collapsible, as the rod 68 with the rod 25 . The motor circuit is still interrupted during this process.

If the diaphragm is closed again and the stop 81 is thus released, the rod 65 moves into the position shown in FIG. 5 position shown. Of course, this also applies to short exposure times in which the bolt 82 is not touched at all.

In the position now reached in FIG. 5 , the contact spring 73 is bent so far by a horizontal arm 84 of the rod 65 that the contacts 74, 75 are closed again, while the arm 66 is almost or completely on the next curve start. the disc 67 rests.

As possible at the same or only slightly f # iiher or later, the contact fingers slipping of the spring 73 from the Kurvensche # 1be and causes closure or a connection of the contact spring 73 with a fixed counter contact 85, the conductive manner to the contact spring 74 - is connected. Accordingly, at this moment the connection between 73 and 74 is re-established and the entire subsequent operating sequence is no longer subject to manual action. Accordingly, a very brief contact closure of the switches 76 or 77 is sufficient for tripping.

The motor 8 now starts up and has the effect that the cam disc also automatically releases the contact finger of the spring 74. The contacts 74, 75 thereby also close due to the inherent force of the spring 74, which tries to push to the left. Arm 84 is thereby relieved, arm 66 is now immediately at the beginning of the curve, which moves it and thus the rod 65 increasingly to the right. Arm 84 lifts completely off spring 74 and arm 81 gradually comes out of the area of bolt 82, see FIG. 7. Finally, arm 66 pushes against spring 75 and lifts it off stop 83 ( FIG. 7), whereby spring 74 is also raised somewhat. Finally, the contact fingers 73 and 74 slide again on the contact track and are connected by this, contact 85 being gradually interrupted by lifting the spring 73 until contact finger 73 reaches the insulating point 72 at the end of the curve of the disc 67 , whereby the motor is switched off. The camera is ready to be used again.

If continuous recordings are to be made, either contact 76 (remote release) or contact 77 (using the manual release 79) must be closed continuously. The operating cycle is then repeated as often as required. With each reopening of the switching contacts 76, 77 , however, the transmission inevitably continues to run until the end of the cam or into the ready-to-release position.

F i g. 8 shows a comparison with the example according to FIGS. 4 to 7 a slightly modified embodiment in which only one slide on the cam is required. In this case, the control arm 65 , which is made of insulating material or is provided with appropriate intermediate insulation, is provided with a metallic support 86 which takes on the role of the second contact track. Accordingly, the contact spring 87 corresponding to the earlier contact spring 73 rests against the metallic support 86 during the last part of the winding. The contact finger 74 slides over the single slide 88, which has an interruption point 89 at the end. The contact lug 87 is electrically isolated from the contact lug 75 but mechanically connected to it, so that both are moved together by the control arm 65 . F i g. 8 again shows the state shortly before triggering. The contact arm 66, 86 has reached the insulating point 89 , whereby the motor circuit is interrupted. If the manual or remote switch 76, 77 is now closed, the motor starts up again until the arm 65, 66 is released from the cam 67 and jumps into the release position. At this moment the connection 74, 75 is interrupted. The engine stands still. The release takes place as before. The contact path 88 must be so long backwards that the connection 86, 88 is made before contact 90 is broken. By the contact 90, the Schalter.76, 77 and at the same time, the contact springs 74 are bridged 87, so that a performed after complete release and re-closing of the contacts 74, 75 a of the actuating circuit in each case to end, even if the contact 76 , 77 was only pressed very briefly. Everything else corresponds to the example in FIG. 4 to 7.

The spatial accommodation of the contacts and mechanical transmission means can according to FIG. 9 can be made. Since it is desirable for spatial reasons to arrange the contact springs parallel to the longitudinal side of the camera cross-section, it is expedient, according to FIG . 9 to deflect the control arm 65 at its end 65 a which is in engagement with the contacts by an angle lever 65 b by 901 .

Claims (2)

Claims: 1. Camera with electromotive film transport and shutter lift using an add-on coupling which engages in the film key provided for manual operation of the film transport and film lift, whereby the optional motor activation of the shutter release is initiated by closing a contact and the motor actuates the trigger via mechanical transmission means, while the touch surface of the mechanical release is kept free for optional manual operation and the shutter lift and the film advance in both cases is carried out by the electric motor, characterized in that when the actuating contact is closed, the motor is switched on immediately and this both the film advance and the shutter open as well as below Avoiding relays, all necessary mechanical and electrical switchovers are carried out. 2. A camera with motor lift according to claim 1, characterized in that the triggering contact (63, 76, 77) actuated either by the release button by hand or via a remote line after the motor has started by a motor-operated contact (33, 85, 73, 90) is bridged. 3. A camera with motor lift according to claims 1 and 2, characterized in that for the purpose of actuating the trigger (25) a reversal of the direction of rotation of the motor (8) brought about by the motor itself by cams and transmission levers is carried out, which thereby has a switching lever (15 ) so changed in its position that the switching lever on the one hand actuates a reversing switch (36, 39, 40, 58, 59) through a cam (37) and on the other hand through a bevel (21 a) and a transmission rod (23) the shutter release of the camera and is then subsequently held in its new position by the same rod (23) and the edge formed by the incline until the re-initiation of the release process is prepared by the elevator effected in the meantime. 4. Camera with motor lift according to claims 1 to 3, characterized in that the switching lever (15) is moved by a cam disk (45) which is connected to a toothed pot (43) which is connected via two pins (50, 51 ) takes the quick transport key (3) of the camera (1) with it, which preferably carries out half a turn to carry out the winding, locking, clamping and counting movements. 5. Camera with motor lift according to claims 1 to 4, characterized in -that the additional housing (4) has a raised edge and is pierced on the long sides by two slots through which a knurled disc (53) emerges from the housing and over a threaded bolt (54) which engages in the tripod thread (55) of the camera (1) to establish a firm connection with the camera body (1) . 6. Camera with motor lift according to claims 1 to 5, characterized in that the device is made so that in the case of the permanent closing of the remote control contact (63) the release and lift activity is automatically repeated and when the actuation is reopened (gyskontaktes, the device is always brought into the ready-to-release position . 7. Motor-lift camera according to Claims 1 to 6, characterized in that a switching lever (15) is provided which is longitudinally displaceable on a pin (14) with the aid of a slot (20) and is pivotably mounted and in one end position, into which it is pulled by a spring (16) , with a step or nose (48, 49) - a switching disk (45) coupled to the elevator drive (44), on the circumference of which the One end of the switching lever (15) slides laterally, can come into engagement and, during the backward (empty) movement of the elevator drive (44), is shifted to its other end position is, in which he actuates the release with the help of a slope (21a) and is held in this position by means of an edge that engages behind dert release rod until the elevator starts and the switch lever (15) runs onto the circumference (61) of the The cam disk (45) is pivoted so far that the edge disengages and the switching lever (15) springs back under the action of the spring (16). # 8. Camera with motor lift according to claims 1 to 7, characterized in that the pin (14) of the switching lever (15) at the same time for attaching a tripod nut (17) and by an annular nut screwed over this (18) for attaching a cover ( 19) is used. 9. A camera with motor lift according to claims 1 to 8, characterized in that the device is made so that the attachment of the additional device (4) without any other change in the camera (unscrewing handles od % '- fog »(50, 51) or the like. Equipped elevator axis (44) of the motor (8) grasps the elevator handle (3) directly and takes it with it. - 10. Camera with motor lift according to claims 1 to 9, characterized in that a rocker (23) is in engagement with the trigger rod or trigger extension rod, which closes an electrical contact (33) when the trigger is mechanically actuated at the beginning of the movement, which is parallel to the remote switching contact and, in the same way as this, triggers and rewinds electrically. 11. A camera with motor lift according to claims 1 to 10, characterized in that the trigger rocker (23) with ein'Ansatz (35) a contact (36) lying in the motor circuit, preferably detects and this actuates one, the switching contacts that the motor - - The circuit is interrupted in the release position of the release and an elevator start is prevented. 12. A camera with motor lift according to claims 1 to 11, characterized in that the release rocker (23) engages with the release extension rod (24) via a spring (27) and a slot guide (29, 30) . 13. Camera with motor lift according to claims 1, 2, 5 to 10, 12, characterized in that a cam disk (67) is connected to the lift axis (44), which during the lift charges a mechanical energy storage device or a spring (64 ), which is released at the end of the cam and interrupts the motor circuit via a control arm (65) and brings about the mechanical release when the motor (8) is at a standstill. 14. Camera with motor lift according to claims 1, 2, 5 to 10, 12, 13, characterized in that the movement of the control arm (65 ) is intercepted at long exposure times on a bolt (82) , which is controlled by the shutter of the camera ( 1) and releases the control arm (65) when the shutter is closed. 15. A camera with motor lift according to claims 1, 2, 5 to 10, 12 to 14, characterized in that the control arm (65) acts on a contact (74a, 75a) in the motor circuit which, when the control arm jumps off ( 65, 66) from the cam disc (67) opens and thereby interrupts the motor circuit, but is closed again in the course of the elevator movement. 16. A camera with motor lift according to claims 1, 22 5 to 10, 12 to 15, characterized in that one (74) of the two contact lugs of the contact which interrupts the motor circuit when triggered, with a feeler finger remains on the cam disc (67 ) rests, is fully released until the control arm (65, 66) and which rests on the cam contact lug (74) has so far deflected by means of a projection (84) that this the intercepted when triggered by a stop (83) break contact ( 75 a) touches again and the motor (8) starts up again, whereupon the cam disc also releases the approaching contact lug (75) , which by its own resilience keeps the contact already closed by the control arm (65, 84) closed even when the Control arm (65, 84) is moved back or lifted off again by the cam. 17. A camera with motor lift according to claims 1, 2, 5 to 10, 12 to 16, characterized in that the cam disc (67) has a metallic double slide which is used to electrically connect two sliding contacts (73, 74) in the motor circuit parallel to an electrical remote switching contact (76) , to which a further contact (77), which is closed upon mechanical triggering, can be connected in parallel and that the double contact path has an interruption point (72) which, when the actuating contacts (76, 77) are open The motor circuit is interrupted in the standby position shortly before the control arm (65) is released . 18. Camera engine elevator according to the purchase reflection of 1, 2, 5 to 10, 12 to 17, characterized in that the two sliding contacts at least the preferably fixed one (74) of them from the cam plate (67) via a link slide Connect the mating contact (85) to each other automatically until the slide has taken over the connection again. 19. Camera with Motoraufiug according to claims 1, 2, 5 to 10, 12 to 18, characterized in that the control arm (65) is not directly associated with sliding contact (74) at the same time with the control arm (65, 66) of the cam (67) slips off. 20. ' Motorized camera according to claims 1, 2, 5 to 10, 12 to 19, characterized in that the mechanical release button (79 ) is locked when the motor attachment (4) is attached so that only the electrical contact located in the first part of the release path (77) can be operated by hand, while the further release process is automatic and further manual operation is blocked by the stop (70) , so that when the motor is engaged, serial recordings can also be made via the remote contact (76) by continuously pressing the hand button (79) possible are. 21. A camera with motor lift according to claims 1, 2, 5 to 10, 12 to 20, characterized in that parallel to the release (77) or remote switching contact (77) harbors a pair of contact springs (74, 87) , one of which Contact spring (74) to slide a cam plate (67) on a contact track (88), which at the same time the mechanical lift of a control arm (65) and for conductive connection via a contact surface (86) of the control - low with a same against the surface (86 ) adjacent second contact spring (87) is used and that the contact surface (86) reaches an insulating point (89 ) shortly before the end of the cam path of the disc (67) , which brings the motor to a standstill when the actuating contacts (76,77) are open and that when switched on of the motor (8) and triggering the control arm (65) a in series with the trigger contact (s) (76, 77) lying contact (74 a, 75 a) in the motor circuit with the motor stopped until it is interrupted by releasing a depends on the shutter speed igen bolt (82) closed again by a part (84) of the control arm (65) by pressing the sliding contact spring (74) and, when the sliding finger (74) is released, additionally by the inherent resilience of the sliding contact spring (74) even after the control arm (65) has been removed remains closed until the connection (74-a, 75 a) is restored by the engagement of the pressure part (66, 86) of the control arm (65) , and that when the control arm (65) is triggered, another parallel contact (90) , the release contact (76, 77) is released and closed and keeps the actuation circuit independent of the actuation of the release contacts (76, 77) until the contact track (88) has taken over and the device is in the ready position (isolation point 89) . 22. A camera with motor lift according to claims 1, 2, 5 to 10, 12 to 21, characterized in that the sliding contacts (73, 74) and the control arm (65) are arranged at its mechanical release end parallel to one another and to the longitudinal direction of the camera cross-section And that the other end (65 a) of the control arm which is in engagement with the sliding contacts is deflected by 90 ' with the aid of an angle lever (65 b). Contemplated publications: German Patent No. 920 589. Contemplated older patents: German patent no. 1 111,007th.