DE8310379U1 - Rail clamp with spark gap - Google Patents

Description

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BERNHARD'RICHTfe'R '"' ₀₅₀₀ nürnberq η , the

at- -T-Ak.1 »iAi-Γ Rcethovtnslrafle IO

PATE NTAN WA LT T _C i ₍ f _un sj.-νγ. k »m 59» 15

granted Representative at the Europ. Palenlaml τ'ιμ'Το "»! «S'pairi d

European patent attorney

04/19/19-3

R-gi

Company Dehn + Söhne GmbH + Co. KG
Rennweg 11 - 15, B500 Nuremberg

'Rail clamp with spark gap "

The invention relates to a rail clamp according to the preamble of claim 1. A disadvantage of this known one Rail clamp is that although the input of the Earthing line in the housing of the terminal and thus this side of the spark gap against the ingress of moisture is secured, but not the screw-side area the spark gap. Since such rail clamps are mainly used outdoors and their function decisive for the safety of electrical systems z. B. signal systems is, the previous one is insufficient Spark gap moisture protection unsatisfactory. this can lead to operational failures and thus lost time to lead. Attempting to insert a loose sealing ring did not help to solve this problem, because the pressure force of the screw on the spark gap lifted it off the sealing ring.

In contrast, the object of the invention is to to form a rail clamp according to the preamble of claim 1 to the effect that the spark gap also the screw side is perfectly protected against the ingress of moisture.

Serve to solve this problem, starting from the generic term of claim 1, first of all the features of the characterizing part of claim 1. This is the shortcomings of the previously known arrangement avoided. The seal (or the sealing surface) is moved into the working position by turning the screw, in which this holds the spark gap firmly, brought into the sealing position and with a corresponding press fit pressed against the sealing surface (or seal) of the clamp. Such a seal is perfect. Together with the other features of this claim is thereby the spark gap is safely protected against the ingress of moisture during operation. But at the same time it is after loosening of the screw, as before, an approximately defective one Replace the spark gap with a new spark gap. Another advantage is that the seal cannot be lost due to their fixed attachment. This is especially true when replacing a damaged one Spark gap is important because a loosely inserted sealing ring can fall out and then fall into the cracks can usually no longer be found between the gravel of a track bed.

The features of claims 2 and 3 contain advantageous configurations of the second sealing point.

A preferred embodiment of the invention consists of the features of claim 1 in conjunction with the features of the preamble of claim 4 (the

are known]. This two-part design of the rail clamp enables the clamping part to be firmly attached to the rail and, as required, the connection part with the E. + K. cable to be connected to or removed from it through moisture. In this context, it is advisable to design the first sealing point in accordance with the features of the characterizing part of claim 4. On the one hand, a cone results in a better and more reliable, flat seal than the known circular ring surface mentioned at the outset. In addition, with Jieser's previously known design, there was a risk that the circular ring surface would be sheared off if the screw was tightened too much.

The features of claims 5 to 7 deal in detail with the design of the connection end of the E. + K. line in conjunction with the one provided there first sealing point.

Further details are given in the description below and the associated drawing of an inventive Referring to the embodiment.

The drawing shows a longitudinal section through a two-part rail clamp with the terminal housing 1 and the Connection housing 2. The connection claws are located on the terminal housing 1, one of which is shown in accordance with section 3 is. Furthermore, the screw 5 with a square head 6 is screwed into a threaded hole 4 of the terminal housing. The earth wire is in connection housing 2 of the terminal intended. For this purpose, it can be moved in the direction of the double arrow B. Inside the housing of the clamp is located The spark gap 9 and in this embodiment within an annular collar 10 of the connection

-A-

housing 2. Terminal housing 1 and connection housing 2 are detachable from one another by means of a bayonet lock screwed, of which the claws 11 of the connection housing and the counter claws 12 of the terminal housing can be seen in the drawing. The terminal housing 1 is firmly screwed to the rail foot of a railroad track by means of the claws. With the help of the bayonet lock (or a similar closure] the connection housing 2 holding the grounding line can be connected to it or, if necessary, can also be released from it. In the operating position, i.e. with the grounding line connected, if the screw 5 is turned so far, leave its head 13 the spark gap 9 presses against the head 14 of the grounding line 7. This is an electrically conductive one and the current safe connection from the terminal housing 1 via the parts 5, 13, 9, 14 to the grounding line 7 manufactured.

In addition to this mechanical jamming and holding of the Spark gap in its operating position, the screw 5 also seals the spark gap 9 surrounding it Interior 15 of the terminal. This is on the screw 5 in accordance with this exemplary embodiment on one therewith firmly connected annular collar 16 a seal, here an annular seal 17 firmly attached, the by turning screw 5 into the terminal housing

Against
1 lies against a matching / sealing surface 18 of the ring collar 10. This is the second sealing point. The first sealing point already mentioned at the beginning between the connection housing 2 and the connection end of the grounding line 7 is formed according to the invention by two conical circumferential surfaces 19 of the connection housing 2 and a plastic casing 20 of the connection end of the Efdungsieitung 7. Also this, first poet

is tightened by screwing screw 5 into the terminal housing 1 by pressing the two sealing surfaces together 19 effective. The desired sealing of the space 15 and the spark gap 9 located therein is thus achieved. The screw 5 thus effects the sealing at the two sealing points 17/18 and 19, as well as the mechanical one required and short-circuit-proof contact of the Parts 13/9 and 9/14.

The above arrangement is preferred Embodiment of the invention. But in principle it is also possible, the seal on the connection housing 2, for example its annular collar 10, and the mating sealing surface on the Screw 5, e.g. B. to be provided on the corresponding side surface of the collar 16 in the direction of the spark gap lies.

The plastic wrap 20 is around the terminal end of the Ground wire 7 sprayed around. It is integral in itself, with its directed towards the earth wire 21 of this line At the end there has a thickening 22 which likewise prevents the entry of moisture. Simultaneously the casing 20 serves as a kink protection. It consists of a hard, wear-resistant plastic, e.g. PVC with a Shore hardness of about 70 to 75.

- Protection claims -

Claims (7)

BERNHARD RjCHTER _8500NORNBERQ “ _f PATENT ADVERTISER τ * νγ. «,,, _ηη « reins. Representative at the Europ. Patent Office - _B - JlSTnETp ₁ Md European patent attorney IF. 04.1983 R-gi DEHN + Söhne GmbH + Co. KG
Rennweg 11 - 15, 8500 Nuremberg Protection claims: Rail clamp for connecting a grounding line to railroad tracks, a spark gap being provided in the clamp, which is electrically conductively connected on the one hand to the grounding line and on the other hand to the clamping parts that can be attached to the rail, with a first sealing point between the connection end of the grounding line and part of the Housing of the terminal is provided and the screw at the same time holds the spark gap in its operating position, characterized in that the screw (5) forms a second sealing point with the housing of the terminal, by a fixed either with the screw (5) or the housing connected seal (17) and also an associated mating sealing surface (18) of the housing or the screw are provided and arranged one behind the other in the screwing direction of the screw, and that the first and the second sealing point together with the clamp surround the spark gap (9) to the outside in a sealing manner. 2. Rail clamp according to claim 1, characterized in that the seal (17) is designed as a circular ring is and that the mating sealing surface (18) is a circular ring-shaped surface matching the diameter. 3. Rail clamp according to claim 1 or 2, characterized in that an annular collar (16) on the screw (5) is provided, either as a carrier of the D - ' (17) or serves as a sealing surface, and that the external ring collar (10) of the clamp, preferably its end face, either the mating sealing surface (18) or the seal (17). 4. Rail clamp according to one of claims 1 to 3, wherein the clamp has a terminal housing and a connection housing holding the grounding line and both housing parts are detachably connected to one another by a lock, preferably a bayonet lock, and the first sealing point of a sealing surface of the grounding line and a associated sealing surface of the connection housing is formed, which can be brought into their sealing position by means of the screw, d adurc h characterized that the sealing surfaces (19) of this first sealing point are conical to the screwing direction. 5. Schisnenklemme according to one of claims 1 to 4, characterized marked, dal '.'as connecting end of E. + K. Line (7) is firmly surrounded by a one-piece plastic sheath (20) which acts as a kink protection as well as at the end of the rope as protection against moisture (22) is formed and also has one of the conical sealing surfaces (19). • « 6. Schieneη clamp according to claim 5, characterized that the plastic casing (20) from a hard order wear-resistant plastic, preferably polyvinyl chloride consists. 7. rail clamp according to claim 6, characterized by a plastic with a Shore hardness of 70 to 75