FI59367B - Ankare - Google Patents

Description

I «fr * ·! M (11vAdvertisement Rg7 / n 11 (11) UTLÄGGININCSSKRIPT 0 * ύ 0 'C (45) · Patent aySnn-tty ΙΟ 03 1 * 11'

Patent details ~ (51) Kv-ikJ / intxi. B 63 B 21/36 FINLAND — FINLAND 0 ») P« t «nttihak * fnui - PManUMSkning 770446

. . (22) Hskwntapilvt - · Amftknlngtdag 10.02.7T

'' (23) AlkuplM — GlMghutadag 10.02.77 (41) Tullut Julklnksl - Bllvtc offmtllg 11.08.78

Patent and registration authorities ....., ... „, .... _. . , (44) NlhtMksIptnon a kuLjullulau pvm.—,.

Patent · och rejisterstyrelien '' Antökm uttagdeehutUkrift * n pubiicnd 30.04.8l (32) (33) (31) Pyr ^ sny atuolkau »—Begird prlorhat (71) Oy Wartsila Ab, Värtsilä, FI; Sörnäisten rantatie 9 “11> 00530 Helsinki 53, Finland-Finland (FI) (72) Björn Lindvall, Jakobstad, Finland-Finland (FI) (54) Anchor - Ankare

The invention relates to a female anchor with collapsible vanes having an arm portion and vanes or the like rotatably mounted therein and rotating in different directions, each having its own axis or pin of rotation.

The female anchor, whose wings are collapsible, is known per se, but the rotatable attachment of the wings to the arm part of the anchor has formed a weak point both in terms of prefabricated technology and in terms of strength technology. In general, both the shank part and the wings have had bores to which a separate pin is fitted during the anchor assembly stage, the fastening of which is secured by riveting or some other rather laborious manner. The pin has generally been of a different material than other parts of the anchor, and this may have caused electrochemical reactions that accelerated the corrosion of the anchor in saline seawater. In addition, drilling the holes in the pin and attaching the pin to the holes has required a lot of additional work and has thus been able to increase the cost of manufacturing the anchor.

2 59367

The object of the invention is to provide a female anchor with collapsible wings, the attachment of which is designed to be considerably more advantageous from the point of view of manufacturing technology than in known anchors. The invention is characterized in that bearing openings are formed in the shaft part for said shafts or pins by connecting two separate parts, at least in the anchor assembly step, so that these together form bearing openings. In this way, the advantage is obtained that no bores are required at all, since the impeller shaft or pin can be an integral part of the impeller and the opening according to the invention in which this shaft or pin is inserted is formed by connecting two parts already formed in their initial manufacturing step. From a manufacturing point of view, this is very advantageous, since the parts of the anchor can be shaped into their final shape already at the stage of their manufacture, and virtually no post-machining is required.

It is most advantageous to make the bearing openings of the wings or the like so that they consist partly of projections in the arm part of the anchor and partly of an additional piece placed on the arm part. In this case, the bearing openings of all the vanes are obtained by means of a single simple additional element. This additional element can be easily attached to the arm part of the anchor by pressing or welding, thus achieving a secure and non-detachable connection.

The anchor according to the invention is very easy to manufacture in a known manner by casting. Casting can be performed so that all parts of the anchor already reach their final shape during the casting stage. Therefore, only conventional casting cleaning work is required and no precision machining is required. It has been found that specifically adused cast iron is very well suited for the production of the anchor according to the invention. However, another ductile cast iron grade can also be used, for example spheroidal graphite iron.

The invention will now be described in more detail with reference to the accompanying drawing, in which Fig. 1 shows a side view of an anchor according to the invention with the wings spread and Fig. 2 shows a partially sectioned anchor according to the invention with the wings folded and spread.

3 59367

In the drawing means 1 anchor shank and 2 anchor wings. The vanes are held in their folded position by means of a retaining ring 3, which also acts as a holder for the vanes when they are spread.

It can be seen from Figure 2 that the vanes 2 have a fixed pin 4, which is preferably made as an integral part of the wing. The pins 4 are mounted in an opening 3 formed so that the radial projection 6 in the arm part 1 of the anchor forms the upper and inner edge of the opening, while its outer and lower edges are formed by a separate support piece 7 placed on top of the arm part of the anchor. If the anchor has four vanes, as shown in the drawing, the arm part 1 has four projections 6 and the support part 7 four axial projections 8, so that a suitable bearing opening is formed on the pin of each wing. In the embodiment shown, the support part 7 is welded to the arm part 1 of the anchor by a weld seam 9. Instead of welding, the part 7 can also be pressed to the arm part 1.

All parts of the anchor shown are made of cast iron.

The invention is not limited to the embodiment shown, but several variations of the invention are conceivable within the scope of the appended claims.