JPS636648Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention includes a casing, a lid rotatably supported on the casing, and a lock for locking the casing and the lid in a closed state, and a drive means for chart paper as a record carrier; Centering means, entrainment means and various display means readable through the window are arranged in the lid, the axis of the lock being parallel to the central longitudinal axis of the tachograph, and the axis of the lock passing through the tachograph. Concerning a type of tachograph in which a lock is attached to the lid.

Not only the display mechanism, but also the chart paper is directly attached to the lid of the tachograph, and the receiving member, carrying member, and driving member for the chart paper are also arranged inside the lid, and the lid part serves as a recording support and guide for the chart paper. The structural concept of the tachograph, in which other recording mechanisms, their drives, and necessary measuring devices are housed in the tachograph casing, is the recording position of the chart paper in the tachograph. It is well known that the position in a plane perpendicular to the central longitudinal axis of In arranging the chart paper as described above, it is important that in any installed condition given to the tachograph, the chart paper will be directed towards the observer when the tachograph is opened, and that the chart paper will be directed towards the observer during sampling inspection of the record and when replacing the chart paper. There is a desire to be able to handle chart paper without difficulty. For this purpose, as is well known, the lid, which can be locked with the casing by means of a lock, must also be able to be handled in a simple manner when opening and closing. Access to the lid is usually achieved by means of a key which cooperates with the lock. Of course, this key is given a suitable size to ensure good handling. On the other hand, however, it is necessary to construct and retain the lock on the tachograph lid in such a way that the retention of the lock satisfies the handling and locking requirements. Since in this case there is a sealing element which can be deformed and has a relatively large surface area, normally very large forces have to be transmitted via the locking element to the lock and thus to the retaining part of the lock.

Therefore, in tachographs which preferably have a cylindrical housing shape, the diameter of which is determined by the diameter of the chart paper used, the lock can be attached to an extension formed outside the lid cross-section. placed and approximately congruent with this addition to the casing;
It has been adopted as a structurally simple means to provide an additional part for engaging the locking member of the lock from behind.

By configuring the lock and its holding part in this way, not only is freedom of configuration possible, but also the problem of sealing on the closing surface between the lid and the casing can be solved, and the display member can be placed on the surface of the lid. It is now possible to make full use of the configuration. However, it must be accepted that when such a tachograph is integrated into an instrument panel together with other circular instruments, the overall aesthetic impression is not satisfactory. Difficult installation problems arise, particularly if the front surface of the tachograph lid is to lie approximately in the installation plane, or if the lid only slightly projects beyond the installation plane. In this case, a special recess must be provided in order to integrate the tachograph in the instrument panel.

This relatively problematic drawback is due to the geometrically regular construction of the lock, which must be operable from the front side of the tachograph in order to facilitate handling of the lid and to integrate the tachograph in line with the instrument panel. This can be avoided as long as the display member is placed in a tachograph that has no additional portion, and the structure of the display member is tolerated to some extent.

For example, according to West German Utility Model No. 1770024, the retaining or fixing part of the lock is connected to the functional part of the lid and is pivotably connected to the casing of the tachograph, and a recording mechanism that cooperates with the lid and the casing is connected to each other. It has been proposed to arrange a lid component, generally a mounting plate or a pot-shaped component, which is arranged both on the casing and so can be centered precisely with respect to the casing. However, such proposals are not very effective. a second lid component constituting a lid, the second lid component being permanently coupled to said lid component if possible;
Generally, a frame or ring closes the front side of the lid, preferably tastefully and against tampering with the internal mechanism, and also closes off the front side of the lid and covers the windshield and various parts used for the display. This is because it serves to hold the lock and, if necessary, to act as a reflector, and it had to be centered in the lock sleeve or lock cylinder of the lock, both for aesthetic reasons and for sealing reasons. In other words, such a front frame, especially if it can be coupled with the first lid component in a locking manner, is subject to a number of dimensional restrictions and requires an extremely large manufacturing cost.

Alternatively, it is also possible to hold the lock only in a suitably constructed front frame, in which case even if the lock is supported by expensive means on the front frame, the lid will remain closed and remain closed. The tilting moments that sometimes occur can lead to deformation of the relatively thin-walled front frame for various reasons. Furthermore, in this case, the accumulation of manufacturing errors results in dimensional deviations in the penetration depth of the locking member and thus in relation to the support surface of the locking member relative to the casing.

The above risks must of course be avoided by arranging the lock within the cross section of the tachograph casing. This is achieved with the construction condition that the diameter of the tachograph casing, and thus the diameter of the stopper collar that serves for mounting the tachograph, should be matched as closely as possible to the diameter of the chart paper used and should be only as large as necessary relative to the diameter of the chart paper. This applies to tachographs with a cylindrical casing. In this case, only a small amount of play is created with respect to the penetration depth of the locking element relative to the housing wall or to the stopper collar formed on the housing wall.

Therefore, the problem to be solved by the present invention is to arrange the lock within the cross-sectional area of the tachograph casing in such a way that the above-mentioned disadvantages do not occur, and on the other hand to avoid manufacturing errors regarding the penetration depth of the locking member into the casing wall. on the other hand, so that the lock has a predetermined positional relationship with respect to the front lid part.

The problem is that in a tachograph of the type mentioned at the outset, the shaft holding the locking element of the lock is supported on a first lid component which serves as a mounting plate centered with respect to the casing and which supports the lock cylinder. A lock outer cylinder is disposed on a front frame which is a second lid component coupled to the first lid component, and a connecting means is provided on both the lock cylinder of the lock and the shaft of the locking member. The problem is solved in that the connecting means are operatively connected to each other when the first and second lid components are connected.

In one advantageous embodiment of the invention, the lock sleeve carrying the lock cylinder is molded directly onto the front frame, which is the second lid component that can be connected to the first lid component.

Further, as a connection means between the lock cylinder and the shaft of the locking member, a web is integrally formed in the diametrical direction on the end face of the shaft of the locking member, and a slit assigned to the web is formed on the end face of the lock cylinder. It is advantageous to have

The present invention not only effectively solves the above-mentioned problems, but also eliminates the large force acting between the lid and the casing based on the interruption of the force transmission path between the lock cylinder and the locking member. This has the advantage that the closing force does not have to be absorbed by the lock sleeve supporting the lock cylinder. This means that the lock sleeve can be constructed directly on the relatively thin-walled front frame, which is preferably made of plastic. Besides being advantageous both for the appearance of the tachograph and for the sealing action, this also allows for a precise positioning of the lock cylinder in the front frame. A further advantage of the invention is that the lock does not affect the manufacture and assembly of the front frame as a component of the lid, and the front frame can, for example, form part of the hinge of the lid.

Next, one embodiment of the present invention will be described with reference to the drawings.

A tachograph 2 which is integrated into the instrument panel 1, for example in the same plane as the instrument panel plane, and which has an approximately cylindrical contour, has a lid 4 which is pivotably mounted on the casing 3 of the tachograph 2 in a known manner; An additional part 5 fixed to the casing 3 is provided. In this case, the surfaces of the lid 4 and the extension 5, which are separated by the pivoting gap 6, are preferably located in the same plane. Through the window 7 provided in the lid 4, there are display members 8, 9 for speed measurement values and a display member 1 for the time.
0, 11, and 12 can be read. On the other hand, the window 1 provided in the additional part 5 of the casing 3
3 makes it possible to read a distance totalizer arranged independently of the lid 4. The control knobs designated 14 and 15 serve for preselecting recording formats corresponding to different driver functions. Further, as can be seen from FIG. 1, a lock cylinder 17 of a lock 18 is disposed on the front frame 16 that closes the lid 4 to the outside.
The key slit is designated by numeral 19.

From FIG. 2, in which the lock 18 is shown in a position in which the lid 4 can be opened, it can be seen that the lid 4 is a first lid component;
In this case, it is composed of a lid component 20 formed in a bowl shape and a front frame 16,
In the closed state of the lid 4 (the closing surface is designated S), the lid 4 is placed on the edge of the casing 3 of the tachograph 2 or on the stopper flange 22 with the ring shoulder 21 configured on this lid 4. It can be seen that it is in contact with through a suitable sealing member. Furthermore, as shown in FIG. 2, the ring shoulder 21 is provided with a bearing, although not shown in detail, which includes the locking member 24 of the lock 18 or the locking member. A shaft 25 to which a shaft 24 is removably connected by a screw 26 is rotatably supported. The locking element 24, which cooperates with the recess 27 in the stop flange 22 of the housing 3, is acted upon by a pressure spring configured as a wave spring 28. This wave spring 28 rests on the ring shoulder 21 on the one hand and is arranged on the shaft 25 on the other hand and has a pin 3 on the end side.
supported by a flange 29 having 0;
In the illustrated unlocked position, the locking member 24 is brought into contact with a stopper 31 formed on the ring shoulder 21. The position of this locking member 24, indicated by the dash-dotted line, is achieved by operating the lock 18 and pivoting the locking member 24. In this case, the locking member 24
is pushed away from the stopper 31 against the action of the wave spring 28 by a slope (not shown) formed on the locking member 24. On the other hand, the front frame 16, which can be connected to the first lid component 20 by means of a suitable locking connection (not shown), serves as a lock sleeve and thus as a lock cylinder 17.
It is configured as a supporting part. In this case, the tumblers 32, 33, which are mounted elastically at right angles to the lock axis, are provided with recesses or grooves 34, 35 in a manner known per se. Reference numeral 36 designates the key introduced into the chain cylinder 17, while reference numeral 37 designates the slot formed in the cylindrical extension 38 of the lock cylinder 17. A pin 30 formed on the shaft 25 of the locking member 24 engages within this slit 37. For fixing the lock cylinder 17 in its axial position, two tongues are used which are integrally formed on the extension 38 and which engage behind an intermediate wall 39 which is constructed in the front frame 16 . One of these tongues is designated 40. Furthermore, a sealing element 41 is provided in the area of the coupling means. In addition, depending on the front frame 16, a windshield 42, a light shielding ring 43 with spring action and a light guide 44 supported on a bracket 45 formed on the first lid component 20, which serves as a scale carrier, It is combined with the lid component 20 of No. 1. Reference numeral 46 indicates a chart paper attached to the tachograph. The connecting means can be constructed as a web-slit joint, as long as the manufacturing precision of the parts to be connected to each other, in particular of the two lid components 16 and 20, allows this. Such a web-slit joint has a key 36 and a locking member 2.
4 enables symmetrical force transmission between the two.

[Brief explanation of the drawing]

The drawings show one embodiment of the tachograph according to the present invention, in which Fig. 1 is a front view of the tachograph incorporated in the instrument panel of an automobile, and Fig. 2 is a view of A of Fig. 1.
FIG. 3 is a partial cross-sectional view taken along a line. 1...Instrument panel, 2...Tachograph, 3...Casing, 4...Lid, 5...Additional part, 6...Swivel gap, 7...Window, 8, 9, 10, 11, 12
... Display member, 13 ... Window, 14, 15 ... Adjustment knob, 16 ... Front frame, 17 ... Lock cylinder, 18 ... Lock, 19 ... Key slit,
20... Lid component, 21... Ring shoulder, 22...
...stopper flange, 24...locking member, 25...
...Shaft, 26...Screw, 27...Notch, 2
8... Wave spring, 29... Flange, 30... Pin, 31... Stopper, 32, 33... Tumbler, 34, 35... Groove, 36... Key, 37...
Slit, 38...Additional part, 39...Intermediate wall, 4
0...tongue, 41...sealing member, 42...windshield, 43...shading ring, 44...light guide, 45...bracket, 46...chart paper.

Claims (1)

[Claims for Utility Model Registration] 1. A system comprising a casing, a lid rotatably supported on the casing, and a lock for locking the casing and the lid in a closed state, and a means for driving chart paper as a record carrier, and a centering mechanism. means, entrainment means and various indicating means readable through the window are arranged in said lid, the axis of said lock and the central longitudinal axis of the tachograph being parallel and the axis of the lock passing through the tachograph; In a tachograph of the type in which the lock is assigned to the lid, the shaft 25 carrying the locking element 24 of the lock is supported on a first lid component 20 which serves as a mounting plate centered relative to the casing; A lock outer cylinder supporting the lock cylinder 17 is disposed on the front frame 16, which is a second lid component coupled to the first lid component 20, and the lock cylinder 17 of the lock 18 and the locking member 2
The tachograph is characterized in that connecting means are provided on both shafts 25 of No. 4, and the connecting means are operatively connected to each other in a state where the first and second lid constituent members are connected. 2. The tachograph according to claim 1, wherein a pin-slit connecting means is provided as a connecting means between the lock cylinder 17 of the lock 18 and the shaft 25 of the locking member 24. 3. Utility model registration claim No. 3, in which the lock outer cylinder supporting the lock cylinder 17 is directly integrally molded with the front frame 16, which is the second lid component that can be combined with the first lid component 20. The tachograph described in Section 1. 4. The tachograph according to claim 1, wherein the shaft 25 of the locking member 24 is elastically supported in the axial direction. 5. Utility model registration claim 1, wherein a web is integrally molded in the diametrical direction on the end face of the shaft 25 of the locking member 24, and a slit assigned to the web is formed on the end face of the lock cylinder 17. Tachograph described.