US2576390A - Anchor - Google Patents

Description

Nov., 27, 1951 R, s DANFORTH 2,576,390

ANCHOR Filed Jan. 6, 1948 F' E L /0 www', UVV L M JNVNTOR.

H 7'TORNE Y Patented Nov. 27, 1951 UNITED STAT/ss PArNfrj oFF-ICE melma s. Danforth, Berkeley, Caiif.,assignoi m Robert H. Eckhoff, Piedmont, Calif.,1astrust ee ApplicationfJanuary 6, 1'948,` Seria1-No^.653f

This invention relates to a twin uke type-of anchor.

In patents 2,249,546, 2,282,566, 2,320,966, 2,351,666, and-in application Serial No. 696,001, led September 10, 1946, Ihave disclosedvarious improvements in twin fluke anchors. Certainpf these have to do with the arrangement andprovision of various structural elements of the anchors, while others: have to, do with the interrelationship of the various parts of the anchor necessary to secure `optimum results with this type of anchor.

This invention relatesl to-structural modifications of a twin fluke anchor for various purposes, among them being to make the construction simpler and more economical, especially in connection with the construction of anchors of rel:- atively light weightandhigh'; holding power..

One ofthe objects of. the invention is. to provide an anchor of. thistyperequiringz very;- few different parts so that manufacturing operations are greatly simplified.

A further object is to provide a twin fluke an-v chor of very simple construction and in which substantially all operative parts are so provided that the weight of the anchor is reduced substantially to a minimum for a given holding power.

The invention is especially applicable to anchors of a size which may be constructed by assembly of pre-formed sheet metal parts, which may be made as by stamping, as will become clear in the disclosure of the anchor which is the subject of this invention. The parts necessary for the production of the complete anchor are reduced to the fewest possible number, as will be more fully explained hereinafter. The designing of the parts is such though that even if they be made by different processes, for example, by casting or forging, particularly in the case of larger sizes., there will still be many advantages due to the simplication and reduction in the number of parts and in the weight of these parts.

In the accompanying drawing Figure 1 is a plan view of a complete anchor constructed in accordance with this invention.

Figure 2 is a side elevation of the anchor showing in dotted lines the permitted angular motion of the shank with relation to the ukes.

Figure 3 is a partial section on line 3-3 of Figure 2.

Figure 4 is an end view taken as from the right in Figure 1 but with the guard plate 28 omitted for clarity.

2 Claims. (Cl. 114-208) The. anchor, asjfshcw-n,in,theV drawing, includes thevflukes, lgand IFI, the-shank I2, stock. I.3,and crown plates; Hand`Vl` I5. The iiukesfV are secured in coplanar relationship to, the stock oneither l side; of; thefshanle I2 which has at one endthe eye, I6; fcr; securement to the anchorfchaimand at; the; Opposite end.- thepivot hole ITI..` through which passes theystock.,

The.` nukes I0 and: I-I include .the`v reinforcing ribs: lit` ,andY I9.` whiclzck are`f formed, engv the edges nearest, the.. Shank. by. in.3 this1instanc-erbendine thev material of-V the iiukevupward atan, angle .of approximately :9 0 degneesto thev planefpfL the nuke-g Y Integral with the reinforcing ribs I, andel9 are the. crown attachment brackets 26 and 2|, respectively, each of `.whicli inclncles,` an ripening 22 and. 23, respectively, throughwhih the. .stock passes `to aidinsecurement.

At. aL .cornery of.. each fluke there. islprovided a lug for welding to the stock, these vbeing 2'4" and 25, respectively. The rear edges may be welded as desired, in addition, or in substitution for this type of attachment.

As is best shown in Figures 2 and 4, the crown plates I4 and I5, formed by bending from sheet or plate stock, are secured as .by welding or brazing to opposite sides of the iiukes. Each crown plate is cut away at 26 to permit a predetermined and limited pivoting movement of the shank upon the stock from one side of the plane of the ukes to the other. A shoulder 21 in each plate constitutes a stop for the shank and the two crown plates are so shaped and located as to limit the relative movement between the nukes and the shank so as to establish the desired maximum angular relation between the shank and the plane of the iiukes.

As shown in Figures 1 and 2, but omitted from Figure 4, there is preferably provided a plate 28 welded at each end to the outer free ends of the crown plates to provide support between the plates when the anchor is undergoing burial in addition to that afforded by crown attachment brackets 20 and 2|. Plate 28 also acts as a guard preventing fouling of the anchor chain between the crown plates.

It will have been noted that the flukes are identical, as are the crown plates, each with the other. Each fluke and each crown plate may be made from a blank of sheet or plate having sufcent thickness for the strength desired, by the simple and relatively economical process of cutting and stamping. y

In the lighter gages,l the flukes and crown plates may be made by use of the sheet metal brake to establish the anges I8, I9, the brackets 20 and 2I, and the proper angular shape of the crown plates. There are, therefore, only seven parts, namely, shank, ukes, crown plates, guard plate and stock to be made up prior to assembly of the device into a complete anchor and of these the flukes and crown plates are identical so that, while seven parts are required, there are, at the most only ve different items.

While especially useful in making the smaller sizes of anchors, sufficient strength of material for which is found in the lighter plates and sheets, the design also has advantages when the anchor is to be made from parts cast or forged. The one will require a minimum of molds, and the other a minimum of die parts. In any case, the parts will be of a minimum weight for a given size anchor.

The anchor contemplated may be in all functional parts like those which I have previously disclosed and the various features of these earlier anchors, not inconsistent one with the other, may be employed or utilized with this.-

If desired, the structure can be further simpliiied by forming the two crown plates I4 and I5 and guard plate 28 of one plate cut and bent to suitable shape. The guard plate can be lightened by cutting holes therein or by relieving the plate between the opposite vertical terminal edges so that, while the plate functions as a guard, its weight is reduced. Crown attachment brackets 20 and 2| can be separately formed and then secured, as by welding, to the fluke flanges.

I claim:

1. An anchor fabricated for assemblyv from plate elementsl comprising a stock; a shank mounted approximately centrally of the stock and pivotally mounted thereon; identical coplanar flukes fashioned from plate elements and mounted on opposite sides of the shank and joined to the stock along their rear edges; each fluke including a flange extending along that edge of the fluke adjacent the shank substantially normal to and in at least one directionfrom the plane of the fluke; each fluke flange extending rearwardly of the flukes to provide a mounting for the fluke on the stock and an extension projecting normal to the plane of the fluke; and a crown comprising a pair of plates each bifurcated generally centrally of one end and bent to provide rst and second crown plate portions, the first crown plate portion including spaced bifurcations each engaged with the ukes on opposite sides of the shank and each extending outwardly and rearwardly to a second crown plate portion extending substantially parallel to the plane of the flukes and spaced therefrom; each fluke flange extension extending away from the plane of the fluke; and means securing each extension to one of said second crown plate portions to support said second crown plate portion.

2. The anchor assembly set forth in claim 1, wherein a guard plate interconnects the ends of said second crown plate portions, thereby preventing fouling an anchor chain between said crown plate portions.

RICHARD S. DANFORTH.

REFERENCES CITED The following references are of record in the rile of this patent:

UNITED STATES PATENTS Number Name Date 2,249,546 Danforth July 15, 1941 2,354,666 Danforth Aug. l, 1944 2,451,719 Danforth Oct. 19, 1948

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