Trumpet clutch
The trumpet coupling , also known as a round pin coupling or a cup coupling , is a special coupling for connecting rail vehicles . It belongs to the family of central buffer couplings .
In contrast to the funnel coupling with flat bolts and an uneven funnel shape, the trumpet coupling has a largely round design of the trumpet funnel for the introduction of the coupling bolt. However, both have a very similar principle of operation. In contrast to the central buffer system with screw coupling, the trumpet coupling allows driving on very tight bends.
In the early days of trams and narrow-gauge railways , the trumpet clutch was widespread. It was used frequently until the 1950s, but is only found in a few companies today. Including the Augsburger Verkehrsgesellschaft , Bernmobil and the Vienna tram , with the latter only as an auxiliary coupling.
The coupling shafts are attached to the vehicles and absorb the forces that occur via a helical or evolute spring . The coupling head is round, with a mostly circular inner bore. The two couplings are connected by means of a bolt that is inserted into the bores of both couplings and each fastened with a locking pin.
Automatic coupling is not possible with this type of construction; the connections for light and brake lines, for example, must also be made separately. Many companies have therefore replaced the trumpet coupling with the Albert coupling , in which the bolt required for coupling is omitted, or with an automatic central buffer coupling such as the Scharfenberg coupling or the BSI compact coupling .
gallery
A trumpet coupling of the Darmstadt municipal tram
Two trams of the Darmstadt municipal tram connected by a trumpet coupling
Detailed view of the trumpet coupling on the Ce 2/2 52 of the Bern city trams
Individual evidence
- ↑ a b Jürg Aeschlimann, Hans Waldburger: St. Gallen – Speicher – Trogen tram. The Trogenerbahn . Prellbock Druck & Verlag, Leissigen 2003, ISBN 3-907579-24-0