A grapnel anchor having an elongated shank with a fixed arm at its lower end and several movable arms mounted on the elongated shank. Each movable arm is mounted on the shank by a polygonal hole in the center of the arm. The upper end of the shank is enlarged to prevent removal of the movable arms from the anchor's shank. The upper portion of the shank beneath its enlarged upper end is a cylinder sized to permit each of the movable arms to rotate about the upper cylindrical portion of the shank. The outer surface of the lower portion of the shank between its cylindrical portion and the anchor's fixed arm consists of several identical elongated rectangles which in cross section forms a regular polygon slightly larger than the polygonal hole in the center of the movable arms.
An anchor comprising a shank having a forward and a rear end with a plurality of flukes secured to the rear end of the shank. The plurality of flukes are secured to the shank by a fluke mounting element. The plurality of flukes are radially oriented and angularly spaced apart and positioned on the fluke mounting element. A plurality of arm elements are radially aligned and oriented with respect to the fluke mounting element. Each of the plurality of flukes may be provided with an inwardly sloped bill segment at a distal end thereof.
An improved motor structure comprising a hollow stator base having a substantially cylindrical hub including a central hole, and a hollow stator having a silicon steel sheets set and a central bore through which the hub is inserted upon assembling. The hub is composed of a plurality of first upright ribs and a plurality of second upright ribs which are of the same number and are alternately arranged in circumferential direction, and a substantially cylindrical lower portion connecting to the lower end of each upright rib. Each pair of adjacent first upright rib and second upright rib are slightly apart from each other. Every first upright rib has an outer engaging portion formed on the upper outer surface thereof and every second upright rib has an outer step portion formed on the outer surface thereof, whereby the silicon steel sheets set of the stator may be engaged by and between the outer engaging portion and the outer step portion so as to retain the stator in axial direction relative to the stator base. Besides, the hub has a first non-cylindrical outer surface, and the central bore of the stator has a second non-cylindrical inner surface engaged with the first non-cylindrical outer surface. Thus the stator may be retained in circumferential direction relative to the stator base through engagement between the first non-cylindrical outer surface and the second non-cylindrical inner surface.
