| 摘要 |
The invention relates to a breech having an obturation ring 8. For reliable sealing, even at very low gas pressures, the obturation ring 8 is positively controlled, to be precise by means of arms 7 which are connected to it, are constructed in a U-shape and engage in guide pieces which are supported in the breech wedge 1. Arranged in the guide pieces 5 are guide grooves which, when the breech wedge 1 is closed, pull the obturation ring 8 against the breech wedge surface via the arms 7, which are connected to said obturation ring 8 and slide in the guide grooves of the guide pieces 5. <IMAGE>
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