| 摘要 |
<p>The upper area of the inlet is assembled of an outer ring (10) with a horizontal extension (14), an inner ring (16) with an axial gap and ribs (28) at its inner surface and two complementary bearing rings. The ribs (28) form a conical area, wider at the top. When a petrol gun is inserted into the inlet (12) the narrow front area of the gun can pass the upper section (10, 16, 28) but is stopped by a locking element located underneath. When a wider diesel gun is inserted the ribbed area (16, 28) is widened and the resistance can be noticed by the user.</p> |
