US711749A

US711749A - Apparatus for raising or lowering ships' boats.

Info

Publication number: US711749A
Application number: US7441201A
Authority: US
Inventors: Axel Welin
Original assignee: Individual
Current assignee: Individual
Priority date: 1901-09-05
Filing date: 1901-09-05
Publication date: 1902-10-21
Anticipated expiration: 1919-10-21

Description

No. 7ll,749. Patentedflct. 2|, I902.

A. WELIN.

APPARATUS FOR RAISING 0R LOWEBING SHIPS BOATS.

I (Application filed. Sept. 5, 1901. (No Model.) 2 Sheets-Sheet I.

W .Z I A V M QM i N0. 7ll,7i49. Patented 001:. 2|, I902.

7 A. WELIN.

APPARATUS FOR RAISING 0R LOWERING SHIPS BOATS.

gApplicaQzion filed Sept. 5, 1901.| (No Model.) 7 2 Sheets-Sheet 2.

-, GEM-M1 THE NORRIS vrrzns co. PNOTO LITHO.. wasnmm'om'm c.

UNITED I STATES AXEL WELIN, OF LONDON, ENGLAND.

APPARATUS FOR'RAISING OR LOWERING SHIDQ+-RHAJKTG SPECIFICATION forming part of Letters Patent No.

711,749, dated October 21, 1902.

Application filed eptemher 5. 1901. Serial No..'74,412. (No model.)

To all whom it may concern.-

Be it known that I, AXEL WELIN, engineer, a subject of the King of Sweden and Norway, residing at 24 and 25 Fenchurch street, in the city of London, England, have invented certain new and useful Improvements in Apparatus for Raising or Lowering Ships Boats, of which the following is a specification.

This invention relates to davits which are so constructed that the davits themselves can turn downward, as in the constructions when the lower end of the davit is pivoted to the deck or when the lower end is in the form of a toothed quadrant which rolls on a rack.

I-Ieretofore when the davit is lowered the boat is lowered at the same time, and thus a greater amount of power is required to hoist the boat inboard than is required to lower it out.

The object of this invention is to some extent equalize the amount of power that is required to launch a boat and that required to hoist it inboard.

According to this invention the tackle is so arranged that as the davit is lowered the boat is raised relatively to the upper end of the davit, and vice versa.

The drawings illustrate difierent arrangements made in accordance with this invention.

Figure 1 is a side elevation of a davit whose lower end is in the form of a toothed quadrant which rolls on a rack. Fig. 2 is a diagrammatic view of the same, showing the davit in two positions. Fig. 3is a diagrammatic view showing a modification in which the pin to which the end of the rope is secured is mounted on the davit.

co is the davit, having a toothed quadrant b in its lower end which rolls on arack c.

d is the handle for actuating the worm (1, carried by the bracket e and turning in the nut a, pivoted to the davit.

The boat is attached to the lower pulley o, the upper pulley 13 being secured to the top of the davit. The'rope 71 is secured to the pulley p and passes around the pulley 0 to the pulley p, back to the pulley 0, then to the pulley 19, then over a pulley q, fixed to the vessel, then over a pulley 1", carried by the davit, and is finally secured to a pin 2' on the bracket 6. Thus when the davit is turned outward the pulley r is moved away from the pin i'and the pulley q, and so raises the boat relatively to the end of the davit.

In some cases the pulley 1' may be dispensed with, the end of the rope being secured to a pin on the davit. This is illustrated in Fig. 3, where it will be seen that the rope h passes from the pulley 10 over the pulley q and is then secured to a pin 6, carried by the davit, the dotted lines showing the outboard position of the davit, in which position, it will be seen, the pin '5 draws the rope around the pulley q as the davit moves outboard.

In all the arrangements a suitable position for the pin 7; is at a distance of about onethird of the length of the davit from the deck and above the center of rotation around which the davit turns whether the pin is on the ship or on the davit.

\Vhat I claim is 1. The combination of a davit free to turn in a vertical plane, a pulley carried by its upper end, an attachment for carrying a boat, a rope passing over the pulley and supporting the attachment, a pulley fixed to the vessel around which the rope passes, and means carried by the davit for drawing the rope over the pulleys as the davit moves outboard.

2. The combination of a davit free to turn in a vertical plane, a pulley carried by its upper end, another pulley to which the boat is attached, a rope passing around both of said pulleys, another pulley fixed to the vessel around which the rope passes, and means carried by the davit for drawing the rope over the pulleys as the davit moves outboard.

3. The combination of a davit free to turn in a vertical plane, a pulley carried by its upper end, an attachment for carrying the boat, a rope passing over said pulley and supporting the attachment, a pulley fixed to the vessel around which the rope passes, another pnlwhich the rope passes, another pulley fixed ley fixed to the davit, and a pin to which the to the davit, and a pin in the vessel to which no end of the rope is secured. the rope is secured.

4. The combination of a davit free to turn in a vertical plane, a pulley carried by its up- I AXEL WELIN.

per end, another pulley to which the boat is Witnesses:

attached, a rope passing around both pulleys, I FREDK. WEATHERLY,

another pulleyfixed to the vessel around FRED O. HARRIS.