A device or mechanism of fastening to adapt it to twins, pins and in general to how many elements can be adapted commonly to fasten two or more eyelets (Machine-translation by Google Translate, not legally binding)

摘要

System formed by the screw as described provided with the pins p and q nails practiced in the tronconical part thereof which when operated by the lower part of the nut also described having an inside diameter equal to the outside of the base smaller dal truncated cone that ends said screw forces the said pins p and q nails to reduce or increase the distance between them resulting in the pinching or detaching of the pin pin etc ... (Machine-translation by Google Translate, not legally binding)