Control body for Christmas tree

Claim 1

A control body for a Christmas tree comprising: a circuit board having a rheostat; a housing receiving therein said circuit board and including: a plug seat mounting thereon two conducting pieces; three engaging sets each of which includes two opposite higher triangular pieces and a lower triangular piece; a base plate extended from one end of said housing and forming thereon a plurality of electric wire guiding grooves each of which is provided with three spaced radially arcuate platelets; and an annulus formed on an inner wall of said housing and regularly forming thereon a knurled surface; a cover plate having three pairs of barbed legs each pair of which is capable of firmly engaging with said higher and lower triangular piece of said each set; an end cover connected to said cover plate, and having a covering portion capable of being securely fixed to said base plate and providing thereunder a plurality of guiding grooves respectively corresponding to said electric wire guiding grooves; a switch disk engaging with said housing for adjusting a contacting relationship between said circuit board and said conducting pieces; a coupling piece received in said housing, connected to said rheostat and including two opposite engaging pieces capable of steppedly and diametrically engaging on said knurled surface; and a rotating disk positioned outside of said housing and capable of firmly engaging with said coupling piece.