| 摘要 |
The present invention consists of an accessory or duct with a rounded end of the trumpet type; the device is formed by a rounded end of the trumpet type, which is the initial point of a duct, the other end having the required preparation for being assembled to the rest of the ductwork, which may be of the same material; the inner and outer diameter and the diameter of the trumpet, as well as the length of the accessory are described in the corresponding figure; the schedule of cables is considered according to the manufacturing materials; the diameters are generally equal to the diameters of the piping or ductwork; the texture must not present any resistance or a minimum resistance when the element to be introduced is slid; the texture of the outer surface may be indistinct; however, with regard to cable ducts or exposed ductworks, it is recommended to have a uniform or apparent surface; this piece is assembled to the concrete wall, so that the rounded area is located at the upper edg e of the manhole, the use consisting in enabling a uniform slipping without damaging the cable that is introduced into the ductwork.
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