| 摘要 |
Constantly sealed syringe for operating at high and low temperatures. The syringe has a casing 1 inside which there is a barrel 2, the latter being connected to the casing with the seal 11 which is compressed with the spring 13. The needle is fixed to the casing 1 by means of a conical seal 5 which is compressed with the spring 8. The tip of the plunger 16 is cylindrical and has two lugs or fins which are inclined outwards from the axis of the plunger and these fins fit between the rod 15 and the drawing device 17 and are widened by means of the system which is inside the head of the plunger. This system is formed by the guide 20, the spring 25 and the pieces 18 and 23. The expansions of the materials produced by temperature variations are compensated for at all the joins by means of the springs. This syringe applies to test laboratories.
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