US3625175A

US3625175A - Recoverable boat anchor

Info

Publication number: US3625175A
Application number: US12927A
Authority: US
Inventors: Laverne E Mangel
Original assignee: Individual
Current assignee: Individual
Priority date: 1970-02-20
Filing date: 1970-02-20
Publication date: 1971-12-07
Anticipated expiration: 1988-12-07

Abstract

A tubular boat anchor with inner and outer shank portions, one of which portions has multiple flukes thereon. The anchor portions may be rotated relative to each other so as to normally free the boat anchor, one shank portion of which has a slot formed therein, which slot may be inclined or spiral with an interengaging pin passing through the slot and being secured to the other of the shank portions. Provision is made for the interengaging pin to be a shear pin, which is circumferentially scored at the point of shear, to pass through the slot, which pin will shear upon predetermined impact, to enable recovery of the anchor line and one of the shank portions of the anchor.

Description

United States Patent l,544,l2l 6/l925 Allen 2,748,74l 6/1956 Abbott ABSTRACT: A tubular boat anchor with inner and outer shank portions, one of which portions has multiple flukes thereon. The anchor portions may be rotated relative to each other so as to normally free the boat anchor, one shank portion of which has a slot formed therein, which slot may be inclined or spiral with an interengaging pin passing through the slot and being secured to the other of the shank portions. Provision is made for the interengaging pin to be a shear pin, which is circumferentially scored at the point of shear, to pass through the slot, which pin will shear upon predetermined impact, to enable recovery of the anchor line and one of the shank portions of the anchor.

PATENTEDuEc 7|B7l 3.625175 FIG. 20 .8

. INVENTOR. LAVERNE E. MANGEL HIS AGENT RECOVERABLE BOAT ANCHOR BACKGROUND OF THE INVENTION This invention relates to improvements in boat anchors and more particularly to boat anchors for relatively small craft.

Various boat anchors have been proposed heretofore, but these, for the most part, were so constructed that, if an anchor became engaged, it could not be readily dislodged by a straight pull on the anchor line, which situation usually means that the anchor line has to be cut, with the resultant loss of the anchor line and the anchor.

PRIOR ART No. 294.813 Schmeelk Mar. 1 l, 1884 No. 2,729,190 Simshauser Nov. I955 No. 2,863,4l Schofield Dec. 9, I959 No. 3,285,218 Gilbertson et al. Nov. IS, 1966 SUMMARY OF THE INVENTION The present boat anchor provides two different approaches to loosening an anchor which has become fastened and which normally does not yield to a straight pull on the anchor line. First, provision is made whereby, upon application of a straight pull on the anchor line, force will be transmitted to the anchor to cause a relative twisting action between the component parts of the anchor, that is, upon pulling or jerking the anchor line, a transverse pin, which connects the two anchor portions in slidable relation will travel up an inclined spiral slot, which will cause the boat anchor, which is engaged with an obstacle, to tend to rotate, which, in most instances, will free the anchor. Second, if the complete anchor should fail to disengage, upon the aforementioned pulls or jerks being accorded the line, a quick jerk on the anchor line, greater than the normal pull, will cause the inner portion of the anchor to impact against the transverse pin, which is positioned within a slot, which will cause the transverse pin, which is notched with circumferential grooves, to shear. This action will enable the inner portion of the anchor and the anchor line to be retrieved, thereby several dollars worth of material can be salvaged, which would otherwise be lost, should it have become necessary to cut the anchor line, to allow the boat to proceed.

OBJECTS OF THE INVENTION An object of this invention is to provide a relatively lightweight boat anchor, whereby the anchor may normally be disengaged from an obstruction.

Another object of the invention is to provide a tubular anchor having flukes on the outer shank portion, and having an inner tubular shank portion which is slidable relative to the outer shank portion, with a slot and pin connection between the shank portions to limit the longitudinal movement therebetween, to enable a jarring action to be imparted to the shank portion having the flukes thereon.

Still another object of the invention is to provide, in an anchor, relatively movable, elongated shank portions, with at least one of the shank portions being tubular and having an angulated, spirallike slot formed therein, with a transverse pin passing through the shank portions and through the slot to enable the arcuate movement of the shank portion of the anchor which has the flukes thereon, when a pull is accorded the anchor line.

A further object of the invention is to provide anchor body portions which are movable longitudinally relative to each other, one of which body portions has longitudinal slots formed therein, which slots have a transverse pin passing therethrough to connect the shank portions for relative longitudinal movement, with the pin being of shear strength to allow the pin to be sheared by a jerk on the anchor line, which jerk exerts greater force than the normal pull thereon.

BRIEF DESCRIPTION OF THE DRAWING With these objects in mind and others which will become manifest as the description proceeds, reference is to be had to the accompanying drawing in which like reference characters designate like parts in the several views thereof, in which:

FIG. 1 is a longitudinal sectional view through the outer. tubular shank portion of the anchor, showing the inner shank portion therein in elevation, with inclined, spiral slots formed in the inner shank portion, and showing a transverse pin extending therethrough, alternate positions being shown in dashed outline;

FIG. 2 is a side elevational view of the boat anchor, taken at a right angle to FIG. 1, with parts being broken away and shown in section, to bring out the details of construction;

FIG. 3 is a top plan view of the anchor;

FIG. 4 is a sectional view taken on the line 4-4 of FIG 2, looking in the direction indicated by the arrows, with parts broken away to bring out the details of construction; and

FIG. 5 is a perspective view of a shear pin which is adapted to pass through the inner and outer tubular shank portions.

DESCRIPTION OF THE PREFERRED EMBODIMENT With more detailed reference to the drawing, the numeral 1 designates generally a tubular anchor having an outer shank portion 2 and an inner shank portion 4. The outer shank portion 2 is shown to have circumferentially spaced flukes 6 near the lower end thereof, as will best be seen in FIG 3. In the present instance four flukes are shown to be secured thereto, as by welding, as indicated at 8. The outer shank portion 2 has axially aligned holes 10 formed therein for the passage of a shear pin 12 therethrough.

The shear pin 12 passes through slots 14 which are formed in the inner shank portion 4 on opposite sides thereof, which slots are oppositely inclined, preferably in the form of a spiral. The shear pins 12 slide within the spiral slots to permit relative rotary movement between the outer tubular shank portion and the inner tubular shank portion 4 a sufficient distance to move the outer and

inner body portions

2 and 4 relative to each other arcuately for or more. The slots 14 are preferably of such length that one of the tubular portions may be moved relative to the other tubular portion by a jerk on the anchor line or rope 18, which rope is shown to be secured to a pin 20. The pin 20 passes transversely through upstanding, apertured ears 22 on the upper part of the inner shank portion 4.

A normal jerk or pull on the anchor line 18 will cause pin 12 to move within the slots 14 to normally rotate the outer shank portion 2, having the flukes 6 thereon, for at least a quarter turn, which will usually free the flukes of the anchor from an obstruction; however, if successive pulls or jerks on the anchor line do not dislodge the anchor flukes 6 from an obstruction, in which they have become engaged, a pull or jerk, greater than normal, is exerted on the rope or boat anchor line 18, which will cause the inner tubular shank portion 4 to move upward along the slots 14, thereby the lower end of the slots will engage with the transverse pin 12 with sufficient impact force to cause a shearing action on the pin 12 at the circumferential grooves 24, formed therein. This shearing action will enable the inner tubular shank portion 4 and line 18 to be removed, thereby obviating the necessity for cutting the line. It is preferable to have the grooves 24 of sufficient depth to enable the pin 12 to shear upon a pull greater than is exerted by the boat being anchored, but to shear at a lesser pull than the pull required to break the rope or line 18.

An extra shank portion 2, having flukes 6 thereon, may be carried in the boat, which, with another shear pin 12, may be slipped into place and the ends thereof peened and riveted, as indicated at 26, to provide an anchor for ready use, thereby obviating the risk of being in open water without an anchor.

While the invention has been described in some detail as being tubular, with the inner portion having slots formed therein, it is to be understood that the flukes may be on the inner portion, below the outer tubular portion and that the slots may either by inclined or straight. The slots may be in the outer portion, with the pin 12 being secured against longitudinal movement within a hole in the inner portion of the anchor, and with the bail portion or pin being affixed to the outer shell, so when the anchor is removed, as by shearing pin 12, the outer shell will be removed, leaving the inner shell and flukes within the water.

While the drawing has indicated the anchor body as being round, it is to be understood that the tubular portion may be rectangular in shape, if so desired.

Having thus clearly shown and described the invention what is claimed as new and desired to be secured by Letters Patent 15:

l. A boat anchor comprising:

a. an outer tubular member;

b. an inner tubular member within said outer member and being relatively slidable;

c. said inner tubular member having at least two spiral longitudinal slots formed therein on opposite sides;

d. a pin passing transversely through the outer tubular member and through the slots in the inner tubular member and movable spirally relative to said inner member to permit relative arcuate movement between said members and to limit the relative sliding movement between said members;

a plurality of flukes on one of said members near the lower end thereof; and

. a line receiving means secured to the other of said members near the upper end thereof.

. A boat anchor as defined in claim 1; wherein said slots in said inner tubular member are spirally arranged to permit relative arcuate movement between said members of at least A boat anchor as defined in claim 1; wherein A boat anchor as defined in claim 3; wherein said shear pin is circumferentially grooved at the points of shear between said outer tubular member and said inner tubular member.

Claims

1. A boat anchor comprising: a. an outer tubular member; b. an inner tubular member within said outer member and being relatively slidable; c. said inner tubular member having at least two spiral longitudinal slots formed therein on opposite sides; d. a pin passing transversely through the outer tubular member and through the slots in the inner tubular member and movable spirally relative to said inner member to permit relative arcuate movement between said members and to limit the relative sliding movement between said members; e. a plurality of flukes on one of said members near the lower end thereof; and f. a line receiving means secured to the other of said members near the upper end thereof.

2. A boat anchor as defined in claim 1; wherein a. said slots in said inner tubular member are spirally arranged to permit relative arcuate movement between said members of at least 90*.

3. A boat anchor as defined in claim 1; wherein a. said pin passing transversely through said tubular member is a shear pin, which pin is adapted to shear when an impact force is exerted thereon greater than the greatest force exerted by the pull of the boat.

4. A boat anchor as defined in claim 3; wherein a. said shear pin is grooved at the shear points between said outer tubular member and said inner tubular member.

5. A boat anchor as defined in claim 3; wherein a. said shear pin is circumferentially grooved at the points of shear between said outer tubular member and said inner tubular member.