JPH0511504Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application The invention comprises a rotatably supported adjustment device,
The present invention relates to a contact device for a speed warning device of a tachograph, having at least two contact springs and a contact bridge mounted on a linearly moving recording slide.

BACKGROUND TECHNOLOGY A general tachograph, whose purpose and mode of operation are well known, has a so-called speed warning device, and this speed warning device emits an acoustic signal when the vehicle in question reaches a specified speed. generate a physical or optical alarm signal. Of course, in order to be able to take into account different use cases and road traffic regulations, the switching point of the aforementioned speed warning device must be adjustable, but this requires the expense of the adjustment and switching elements. must be saved as much as possible. Since the speed alarm is after all a relatively unimportant function in a tachograph, it is not possible to use contactless switching elements for this reason.

For example, the Federal Republic of Germany utility model registration number
In a contact device of the above-mentioned type known from No. 1764444, a contact path mounted on a linearly moving recording slide supporting a speed recording device is mounted such that it can be moved parallel to said slide. A contact spring arranged on the support is assigned.
The support is drivingly connected to a shaft, which is slotted at its end, on which is fastened a disk on which is printed the speed value of interest for the signal generator. In a further known device, the leaf spring contact units, which, in contrast to the previously mentioned known device, are arranged one above the other and are also adjustable in the above-mentioned manner, have an inclined sliding surface. It is switched by a switching path formed in the recording sliding member.

Furthermore, in the case of the speed warning device disclosed in German Patent No. 1774784, the changeover contact path is attached to a gear wheel in the transmission path between the recording slide and the drive unit. Coaxially with this toothed wheel, an adjustment disk is supported which supports at least the contact spring and is in operative connection with the contact path via a wire spring which creates the necessary friction and which serves to prevent axial movement. An operating slit and an adjusting scale are formed on the end face side of this adjusting disc.

Both of the former known devices have disadvantageously high manufacturing and assembly costs due to the longitudinally displacing bearing of the contact support and the drive connection with the adjusting shaft. Furthermore, a plurality of compensation springs are added, which results in an insufficient regeneration performance with respect to the contact pressure, and this makes it possible, without occasional adjustment, to interfere with the function due to insufficient contact pressure on the one hand, and on the other hand. If the contact pressure is in an unsafely excessive value, the premature wear that occurs, especially in the contact paths, can result in an unexpectedly significant stress on the measuring mechanism. Furthermore, the latter known device has similar disadvantages, and apart from the disadvantage of a high construction height, it cannot be used in all cases, and furthermore, by encapsulating the contact elements, Another disadvantage is that direct function control is not possible.

Problem of the invention The problem of the invention is to form or attach the switching member to a recording sliding member supported with relatively high precision and without any play, so that it can be used in all cases. The object of the present invention is to provide a contact device for a tachograph speed warning device of the type mentioned at the outset, which guarantees a more satisfactory functioning than known devices due to its simple construction.

Means for Solving the Problem The measures taken to solve the above-mentioned problem are such that the contact spring is held directly on the adjustment device and rotated on the adjustment device frictionally supported on a stationary shaft. It lies in the fact that the stoppa is assigned in the direction.

Effects of the invention The advantages obtained with the invention are that, since the directly moving contact bridge is assigned to the arc-moving contact, the number of adjustment mechanisms can be reduced compared to known devices, and therefore the manufacturing and assembly Costs are also significantly reduced.

Furthermore, the bearing element of the recording slide and the shaft of the adjustment device are molded in one piece in an outsert-technique working process, and thereby the relevant surface, i.e. the end face of the shaft, and the shaft of the recording slide are formed in one piece. It is advantageous that the dimensions of the contact and the mounting surface are approximately the same and within relatively small tolerances. Furthermore, even in mass production, high reproducibility and low adjustment costs ensure high functional reliability, and above all, contact forces can be kept extremely low, which results in a long service life. Therefore, there is no load on the measuring mechanism.

Embodiment According to an advantageous embodiment of the invention, the stationary shaft is molded in one piece on the support plate by the Outsert technique together with the support element assigned to the guide rod of the recording slide. and a stop is formed in the circumferential direction of the shaft, and a contact spring is lockably connected to the adjusting device, and the planes of the contact springs are formed at an angle with respect to each other.

Furthermore, it is advantageous for the contact springs to be arranged in a non-parallel manner on the adjusting device, so that the spacing between the contacts is as small as possible and thus the adjustment range is as large as possible.

Furthermore, it is also possible to arrange the contact springs offset relative to each other in the height direction so that the contact springs grip a suitably designed contact bridge from both sides, or one contact spring cooperates with a switching path provided in the sliding element. It may also be configured to do so.

DESCRIPTION OF THE PREFERRED EMBODIMENTS As can be seen in FIG. 1, a recording slide 1 supporting a speed recording device (not shown) is only partially shown. A sliding member 1 is mounted in a known manner on two guide rods (one of which is designated by the reference numeral 2 in the drawing) for linear movement, with teeth 3.
is formed, and the sliding member 1 is inserted through these teeth.
is connected in a driving manner to a servomotor if the measurement values are generated electrically, for example in a tachograph. The web which is integrally formed on the sliding element 1 and which is assigned to the guide rod 2 and forms a bearing is designated by 4, and the contact track or contact bridge which is fixed to the sliding element 1 is designated by 5. There is.

Furthermore, as shown in FIG.
The bearing member 7 and the shaft 8 assigned to the shaft 8 are integrally molded. A disk-shaped adjustment device 9 is rotatably arranged on the shaft 8, with a suitable friction to prevent undesired rotations, and at the same time serves as a contact support. The rotational movement of the adjusting device 9 is limited by a stop, which in the exemplary embodiment is designed as follows. In other words, axis 8
Notches 10 and 11 are formed on the outer periphery of the
In these cutouts, a receiving hole 12 of the adjusting device 9 is provided.
In this type, axial webs 13 and 14, which are formed to be slightly narrower than the notch in the circumferential direction, protrude into the groove. In order to operate the adjusting device 9, a cylindrical projection 15 formed integrally on the adjusting device 9 has a slot 16 on its end side. The adjustment scale 17 printed on the adjustment device 9 is used for adjusting the switching point, since it has a window assigned to it in the not-shown cover of the tachograph or in the intermediate wall for narrowing down the respective speed value.

When the adjusting device 9 is assembled in sequence, the bottom surface of the receiving hole 12 rests against the end surface of the shaft 8. By relating the surfaces in this manner, the contacts 20, 21 mounted on the contact springs 18, 19, which are advantageously arranged side by side, can be moved onto the contact bridge 5 or in the event that the sliding element 1 does not slide. Contacting the extension 28 of the coplanar non-conducting contact bridge 5 with the required contact pressure is ensured in a simple manner.

Furthermore, as can be seen in FIG.
2, 23 are formed, and the gaps between these are formed by tongue pieces 24, 2 integrally molded on the contact springs 18, 19.
5 serves to introduce and hold the contact springs 18, 19 in the adjusting device 9, and the contact springs 18, 19 are also lockably connected to the adjusting device 9. Reference numerals 26, 27 designate flexible conductors which are in contact with the contact springs 18, 19 and are used for the current supply.

[Brief explanation of the drawing]

Figure 1 is a longitudinal cross-sectional view taken along line A-B in Figure 2;
FIG. 2 is a plan view of the contact device according to the present invention, and FIG. 3 is a longitudinal sectional view taken along line C in FIG. 1... Sliding member, 2... Guide rod, 3... Teeth,
4... Web, 5... Contact bridge, 6... Support plate, 7... Support member, 8... Shaft, 9... Adjustment device, 10, 11... Notch, 12... Receiving hole, 13 , 14... web, 15... protrusion, 1
6...Slit, 17...Adjustment scale, 18,1
9... Contact spring, 20, 21... Contact, 22, 2
3... Gap, 24, 25... Tongue piece, 26, 27...
...Conductor, 28...Extension.

Claims (1)

[Claims for Utility Model Registration] 1. For a speed warning device for a tachograph having a rotatably supported adjusting device, at least two contact springs and a contact bridge mounted on a linearly moving recording slide. In the contact device, it is noted that the contact springs 18, 19 are held directly in the adjusting device 9, and that a stop is assigned in the rotational direction to the adjusting device 9, which is frictionally supported on a stationary shaft 8. Contact device for tachograph speed warning device. 2. The contact device according to claim 1, wherein the contact springs 18, 19 are arranged on the adjustment device 9 in such a way that the planes of the contact springs form an angle with respect to each other. 3. The contact device according to claim 1, wherein the contact springs 18, 19 are lockably connected to the adjustment device 9. 4. A stationary shaft 8 is integrally molded in the support plate 6 together with a support member 7 assigned to the guide rod 2 of the recording sliding member 1, and notches 10, 11 are formed in the circumferential direction of the shaft. A contact device as claimed in claim 1 of the registered utility model.