US1339532A - Mechanism for turning ships' davits - Google Patents

Description

A. WELIN.

MECHANISM FOR TURNING SHIPS DAVITS.

APPLICATION FILED JULY3, I914. I

Patented May 11, 1920'.

2 SHEETS-SHEET I.

A. WELIN.

MECHANISM FOR TURNING SHIPS DAVITS. APPLICATION FILED JULY 3. 1914.

1,389,532, Patented May 11, 1920.

UNITED STATES PATENT OFFICE.

AXEL WELIN, OF LONDON, ENGLAND, ASSIGNOR TO AMERICAN B'ALSA COMPANY, :INC., A CORPORATION OF NEW YORK.

MECHANISM FOR TURNING SHIPS DAVITS.

To all whom it may concern:

Be it known that I, AXEL WELIN, a subject of the King of Sweden, and a resident of London, England, have invented certain new and useful Improvements in Mechanism for Turning Ships Davits, of which the following is a specification.

The object of this invention is to provide improved means for turning ships davits.

It is desirable that means for turning davits should. be of such a nature that (1) they can be fitted to existing davits of the ordinary type, (2) they can be arranged in any convenient place, close up to or removed some distance from the davit, with as little alteration as possible, (3) they can be fitted to existing davits of varying size with alteration of as few parts as possible, and (4) they shall be unafi'ected by bending of the davit under its load.

According to the present invention I secure to the davit a grooved collar to one point of the circumference of which I fasten a wire rope. From this point the rope passes in both directions around the collar and thence over guide pulleys if necessary, to a drum or collar on the bottom of a vertical shaft which can be rotated preferably by a crank handle and worm gear, toothed gearing being interposed if desired. The drum and the parts actuating it may all be carried by a pedestal which can be bolted to the deck at any convenient place so that the only thing that is aifected by the distance of the actuating part from the davit is the length of the rope.

I preferably secure the collar to a divided strap or bracket which can be clamped to the davit. The collar is a complete ring with a central orifice so large that it can be slipped onto the davit and thus one size of collar may be fitted to davits of various sizes.

It is advisable that the collar should be as near as possible to the bearing of the davit in order that the mechanism may be unaffected by any bending of the davit due to the load.

I may arrange for tightening the rope to take up stretch by forming a loop in the middle of the wire and passing this loop through a hole in the collar into the interior Specification of Ietters Patent.

Patented May 11, 1920.

thereof and then making it fast to the davit so that by turning the collar around. the davit the rope will be tightened.

In cases where the two davits turn in unison but in opposite directions both maybe turned by a single rope of which ends are secured to a single drum. Or they may be turned by two ropes passing around two drums and geared together by elliptic gears so that they can be operated from a single shaft.

I may employ similar means to turn from a single spindle both davits even when they do not turn in unison that is when the distance between them is less than the length of the boat as is usually the case with davits the twov of the old fashion. T o effect this I connect as described above a collar on each davit to a drum or driving pulley by a rope and I provide each drum with a segment of teeth the one segment meshes with a driving pinion and the other with an intermediate pinion which itself meshes with the driving pinion which is mounted on a spindle that can be rotated by any convenient means. The segments are connected by a link or coupling and are so arranged that one only is in mesh at first; as the first segment turns the other is turned in. the opposite direction and then in the same direction owing to the action of the link; as the first segment comes out of mesh the second segment comes into mesh and the continued rotation of the spindle completes the turning out of the davits. In. place of coupling the segments, the heads of the davits may be coupled together.

The accompanying drawings illustrate my invention. 7

Figure 1 is an elevation showing means for turning a single davit. Fig. 2 is a. plan to a larger scale of a collar, and Figs. 3 and 4 sections at right angles to one another of a collar and strap. Fig. 5 is a plan showing means for turning two davits in unison. Fig. 6 shows the arrangement. of elliptic gear. Fig. 7 is a plan of the arrangement for turning two davits which do not turn in unison, and Fig. 8 shows an arrangement of gear mechanism for turning out such davits.

a is a davit to which near its bearing 6 is secured a split strap 0 to which is bolted a grooved collar cl. A loop in a rope e is y) 7' are fast with the two drums. The drums passed through a hole f in the collar and secured by a screw 9 to the strap. The rope is then passed in both directions around the collar and is then led to and fastened around a drum h on a shaft '5 carried by a pedestal j and having fast on it a worm wheel 70 meshing with a worm which can be turned by a handle Z. c

Fig. 5 shows a pair of davits driven to gether from a single pedestal. An endless rope passes from one davit around a drum h, to the other davit, around a second drum co axial with the first, and then back to the first davit, so that by turning the handle the two davits are turned. out (or in) to gether at the same speed.

In Fig. 6 the spindle i is rotated in any convenient way, say by worm gear, or by means of an internal ring of teeth fast on it, and meshing with a pinion rotated by a crank handle. The spindle has fast upon it one of the drums 7t and also an elliptic gear wlheel m meshing with an equal elliptic wheel a fast with the other drum. The gears are so arranged that at the beginning of the turning out movement the forward davit turns faster than the aft davit. That is,-the position of the gears, which is shown in the drawing, is their normal position with the boat in board.

This modification of my invention is especially suitable to cases in which the boat is carried on the davits with its bows somewhat nearer the side of the ship than is its stern, and can be slung out with little or no back movement of the aft davit.

In Figs. 7 and 8 the shaft 2' has on it a pinion 0 meshing with a toothed segment 1) and with it an intermediate pinion g which meshes with a segment 9. Tie two segments and pinions are for the sake of clearness shown to a larger scale than the davits and boat but in reality the drums are the same size as the collars on the davits. The two segments are connected by a link 8. The segment 1 is fast with the drum 7i connected to one davit a while the segment p has fast with i; adrum connected to the other davit u. On starting to turn out, the segment 1" is in mesh with the pinion 1 and the'davit d is in fined out to thedottedpositions 1 and 2, the davit it being moved by the action of the link first into the position 1 and thence into position 2; just before the segment 1" comes out of mesh the segment 3) comes into mesh with pinion 0 and davit u is thus turned from position 2 to position 3, davit a moving back from position 2 to position 3. If desired the davit heads may be connected by a bar in which. case the link 8 may be omitted, the various movements taking place in the same order.

I claim 1. In combination, a pair of davits pivoted to rotate and having an overhanging portion adapted together to support a boat, collar on each davit, a flexible connection connected with each collar and having parts extending on opposite sides thereof, and a common driving mechanism for all the said parts for rotating said shaft in opposite directions to swing the davits in opposite directions.

2. In combination, a pair of davits piv oted to rotate and having overhanging portions adapted together to support a boat, a collar on each davit, a flexible connection secured to each collar and having parts extending on opposite sides thereof, asingle actuating spindle supported adjacent to said davits, and drum mechanism associated with said spindle at its lowerend and to which said opposite parts of the flexible connection are connected.

3. In combination, a pair of davits pivoted to rotate and having overhanging portions normally extending toward each other and arranged to support a boat therebetween, the distance between the axis of the davits being less than the length of the boat to be carried thereby, a collar on each davit, a

flexible connection secured to each collar and having parts extending on opposite sides thereof and a single driving mechanism to which the parts from both davits is connected adapted to cause the outboard movement of one end of the boat first and then of the opposite end thereof.

4c. The combination with a pair of davits pivoted to rotate, of a collar on each davit, a pair of drums, flexible connections between said collars and drums, an actuating spindle, a driving pinion on said spindle, an intermediate pinion meshing with said pinion, and a toothed segment associated with each drum so arranged as to mesh the one with said driving pinion and the other with said intermediate pinion.

5. The combination with a pair of davits pivoted to rotate, of a collar on each davit. a pair of drums, flexible connections between said collars and drums, an actuating spindle, a driving pinion on said spindle, an intermediate pinion meshing with said pinion, a toothed segment associated with each drum so arranged as to mesh the one with said driving pinion and the other with said intermediate pinion, and a link pivotally connected to the two segments.

AXEL W ELIN.

Witnesses:

W. E. Roenns, O. J. l/VORTH.

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