US1096126A - Slip-hook. - Google Patents

Description

L. VON RANTZOW.

SLIP HOOK.

APPLICATION TILED 13210.12, 1913.

1,096,126. Patented May 12, 1914.

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COLUMBlA PLANOGRAPH C04. WASHINGTON. D. c

UNITED STATES PATENT OFFICE.

LUDVIG VON RANTZOW, 0F COPENHAGEN, DENMARK, ASSIGNOR TO THE ENGEL- HARDT DECKED LIFE BOAT 00., 0F COPENHAGEN, DENMARK, A FIRM.

SLIP-HOOK.

Specification of Letters Patent.

Patented May 12, 1914.

To all whom it may concern:

Be it known that I, LUDVIG VON RANTZOW, a subject of the King of Denmark, and residing at Copenhagen, Denmark, have invented a new and useful Improvement in Slip-Hooks; and I do hereby declare the following to be a full, clear, and exact description of the same.

The invention relates to a slip-hook of the kind in which the hook which is hooked into an eye-bolt, shackle or the like carrying the weight can be opened under the influence of the force as soon as a member retained in a certain position in relation to the hook is released, so that no extraneous power is required for causing the hook to slip. Such slip-hooks are very appropriate in cases where two or more hooks are to be caused to slip exactly simultaneously. This is for instance the case when launching life-boats, when under certain circumstances it is desirable to release the boat from the tackles of the davits just before the boat is fully supported by the water.

According to the present invention a sliphook of the kind referred to above isconstructed in such a manner that the slip-hook together with its supporting frame are adapted to be laid down on the deck of a boat, which is sometimes desirable when a number of boats are to be superposed, and this in such a manner that the different parts or members of the slip-hook do not essentially alter their relative positions when the slip-hook is being laid down. The active parts of such a hook are retained in their active position by means of a chain or similar flexible connection and the object aimed at is obtained in a preferred form of the invention by the laid chain or the like being led over a guide pulley, the axis of which coincides with or is near to the axis on which the whole apparatus is laid down. 7 An example and a modification of the invention applied to. the launching of lifeboats are shown in the drawings in which Figure 1 shows three collapsible or decked life-boats placed one on top of the other, the uppermost of which is being lifted in the davits by means of slip-hooks in accordance with the present invention. Fig. 2 is a plan view of one of the life boats, the frames carrying the hook being laid down. Fig. 3 shows a side view of a single slip-hook and associated parts drawn to a larger scale.

Fig. 4 a front elevation of the arrangement shown 1n Fig. 3, as viewed from the left side thereof, and Fig. 5 is a detail hereinafter more fully referred to.

The book shown in Fig. 3 is adapted for being hooked into the eye 6 in the block 0, by which the boat is suspended. The book a is pivotally mounted by means of a bolt 03 on the frame 6 and is provided with a prolongation or tail-piece f. By means of abolt g in the frame 6 the stays h (Figs. 34) are pivotally mounted the arms of the stays at top being connected by a bolt, on which the roller is is mounted. This roller in the position shown in full lines in Fig. 3 bears against the underside of the tail piece f. The stays '72. are retained in the position shown by a flexible connection m which is led over guide-pulleys n and Z, the other end of the flexible connection being fastened to an operating means 0 shown in Figs. 2 and 5. As shown in Figs. 2 and 5 the flexible connections from both of the slip-hooks at each end of the boat are fastened to the same operating means and laid in the same direct-ion around part of the circumference of the disk 0'. The disk 0 is revolubly mounted on an axis p in the deck or athwart and 1s provided with an operating handle 9 by means of which it can be retained against rotation by any suitable means. In the deck thwarts or other parts of the boat, lugs a are provided in which the frame 6 is pivotally mounted by means of bolts o.

Then the eye 6 is engaged with the hook a the detent s, pivoted on the bolt or thumb screw m Fig. 3, prevents the eye from leaving the hook by chance before the runner in the tackle has been tightened, the detent .9 being prevented from turning by the said bolt or thumb screw.

The apparatus acts in the following manner: When the parts are in the position shown in Figs. 1, 3 and 4 the boat can be hoisted up, swung out and lowered. The hook a is prevented from turning on the bolt (Z, by the underside of the tail piece 7 resting against the roller 70. The underside of the tail piece f is of a curved shape, and the stays h form an angle with the underside of the arm, which will produce a force tending to cause the roller 70 to run along the surface of the tail piece and press the arm it toward the position shown in dotted lines in Fig. 3, from which, however, it is prevented by a strain in the chain m fastened to the disk 0, which strain counteracts the operation. It is understood that this strain can be given a suitable value in relation to the weight or force acting on the hook a by choosing the curved shape of the engaging surface of the arm 7 and its angle with the stays h in appropriate manner. hen the boat has been lowered to a suitable distance from the water level, so

that it is not yet water supported, the arm 9 is lifted and the disk 0 is thereby released, and will turn under the strain acting on the flexible connections m and both will be alike eased off at exactly the same time, so that the rollers run off and release the hooks, whereby both devices are released simultaneously and the boat falls in the right manner down on the water.

When the hooks are not in use, the frames 0 are laid down, being turned on the bolts 2), so as to assume the position shown in Fig. 2. Thus they are not in the way when it is desired to put a number of boats on top of each other as shown in Fig. 1. The chain at is hereby bent over the guide pulley Z which is arranged close to or in the line connecting the bolts '0 so that the relative positions of the parts of the slip-hook are not essentially altered when the frame of the slip-hook is laid down so that the slip hook is always ready for use, 2'. e. the hook member a can not get out of its active position.

By constructing the slip hook in the manner indicated, in which the releasing takes place by means of flexible connections and locking devices and the weight in the boat the chains taking up but a. small fraction of the strain, the result is attained that a contemporary releasing of a number of slip-hooks can be effected with much greater security than by constructions in which self-barring mechanisms are used, which require positive power for operating the releasing means, and the arrangement described according to which the hook member a is retained in its active position has th advantage that no loss of time Or trouble is incurred by adjustment of the parts when the slip hook is to be used in a hurry.

Having thus fully described my inven tion, I claim as new and desire to secure by Letters Patent:

1. A slip-hook adapted to be laid down around an axis, comprising a frame, a movable hook-member, supporting means for holding the said hook member in its active position, and a flexible connection securing the said supporting means in their active position independent of the position of the said frame.

2. A slip-hook adapted to be laid down around an axis, comprising a frame, a movable hook member, supporting means for holding the said hook member in its active position, a flexible connection securing the said supporting means in their active position and a pulley turnable on an axis substantially coinciding with the above named axis and guiding the said flexible connection.

3. A slip hook adapted to be laid down around an axis, comprising a frame, a movable hook member, a stay holding the said hook member in its active position, a flexible connection securing the said stay in its active position and a pulley turnable on an axis substantially coinciding with the above named axis and guiding the said flexible connection.

In testimony whereof I aiiixed my signature in presence of two witnesses.

LUDVIG VON RANTZOVV.

WVit-nesses CECIL V. Sonon, VIceo BLoM.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. 0.

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