| 摘要 |
The invention relates to the use of a cam of ovoid shape for blocking, at the base of its U-shaped seat, a connection rod (5). This device consists of: 1st) a U-shaped rod support (4), 2nd) a CAM (1) of ovoid shape with a striated convex edge, 3rd) a SHAFT (2) made up of three different sections, 4th) a brake SCREW (3). The U-shaped support (4) has its two vertical walls drilled with two holes of different diameters in the horizontal axis. The wall drilled with the smaller diameter is drilled vertically, and at a tangent to the preceding hole, with a blind hole which is threaded over the half of its depth, which will be the seat for the brake screw (3). The cam of ovoid shape has its edge, of convex shape, over a part of its serrated perimeter. It is drilled, in its face, with a hole of square cross-section. A brake screw, screwed into the vertical wall of the U-shaped support, blocks any movement of the shaft and of the cam made integral by its square engagement. <IMAGE>
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