| 摘要 |
A convex lens assembly including a back board holding a convex lens, a mounting frame fastened to a support of a building, a ball socket fastened to the back board, a socket cover fastened to the back board to hold down the ball socket, and a ball head connecting rod having a ball head at one end coupled to the ball socket and a threaded rod at an opposite end fixedly connected to the mounting frame, wherein the back board is integrally molded from impart resisting plastic and mounted around the ball head connecting rod, having an annular groove at a front side near the border which receives a flanged border area of the convex lens, a plurality of locating rods pressed at the flanged border area of the convex lens to hold down the convex lens, a circular mounting hole at the center of its back side which receives the ball socket, and a plurality of locating notches equiangularly spaced around the circular mounting hole; the socket cover has a plurality of threaded locating strips perpendiculary raised from the border and respectively inserted through the locating notches of the back cover within the circular mounting hole and then fixed in place by a lock nut, one locating strip being made greater than the other locating strips for directioning in installation.
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