| 摘要 |
The design relates to a shape of two interconnected funnels (3,4) and their axle facing towards the dependent member and leading member, the previous figure discloses that the invention comprises also two posts of an internal funnel (4) passing through the two grooves (22) of the external funnel (3), two posts of the back axle that passes through the two grooves of the internal funnel (4), with which their movement is as follows:
As the two grooves (22) of the first funnel are inclining in the same direction, when the leading member turns, the first funnel turns in the direction of the inclining of the two tracks.
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