US1180322A - Ship's davit. - Google Patents

Description

E. F. SANFORD.

SHIPS DAVIT.

APPLICATION men JULY 27,1915.

Pateqted Apr. 25, 1916.

A TTOR/VEY THB coLumxA PLANOGRAPH co., WASHINGTON, b. c.

. @NlFED i EDGAR?. SANFORD, OFALAMEDA, oALrronnrA.

SHIPS '.DAVIT.

Application led July 27, 1915.

To all whom t may concern Be it known that I, EDGAR F. SANFORD, a citizen of the United States, residing at Alameda, in the county of Alameda and State of California, have invented certain new and useful Improvements in Ships Davits, of which the following is a specification.

My invention relates to the class of davits, whereby a boat or other object may be supported, and raised or lowered, as, for example, to or from the deck of a ship, and has for its object the provision of a davit of simple and strong construction, by means of which a boat can be quickly and easily swung a safe distance clear of the side of the ship upon which it is carried, and from this out-board position lowered into the water.

To this end my invention consists in the novel construction and arrangement of parts hereinafter described with reference to the accompanying drawings, which form a part of this application, and in which- Figure l is a broken, part-sectional elevation of my davit, as seen from out-board. Fig. 2 is a fore and' aft elevation of the same, the dotted lines showing the davit in its outboard positions and the full lines showing it in its in-board position. Fig. 3 is an enlarged detail section on the line of Fig. 2.

Referring more particularly to the drawings, the numeral 1 indicates the side or other part of the ship upon which the davit is supported. A horizontal rod 2, with upturne'd ends 3, is pivotally mounted on the ships side 1 by the journal brackets 4. Over each of the upturned ends 3 of the rod 2, a tube 5 is fitted and rigidly secured thereto. Suitable brace rods 6 with their brackets 7 serve to further unite the tubes 5 with the rod 2. Each of said tubes 5 forms an elongated vertical socket for the reception of the lower end of a. crane-member 8, within which socket said crane member rests uponv the upturned end 3 of the horizontal rod 2, and is free to rotate on its axis.

A sufficient clearance 9, indicated at the left in Fig. 1, is left between the cranemember 8 and its socket tube 5, to permit of copious lubrication in the form of a body of oil or mass of grease, in order to protect the parts from rust or corrosion, and insure their operation under all circumstances; a

acking-nut or cap 10 being provided to retain the lubricant and exclude water.

The upper ends 8 of the crane-members 8 Specification of Letters Patent.

Patented Apr.. 25, 1916.

Serial No. 42,120.

are bent over as usual with davits, and 'from these bent over ends is hung the boat 11, by means of a tackle comprising the blocks 12 and 12 and the rope 13. A vertical slotl 14 is formed` in the upper vertical portion of each crane-member 8. This slot 14 is in line with the vertical axis of the crane-member 8, as shown particularly in Fig. 3 of the drawings, and is preferably formed by an offset 14 in said crane-member and a rod 15 bridging said offset and fixed to said cranemember, as by being welded thereto. The fall of the rope 13 is passed through this slot 14 in the manner shown in thedrawings, and by this arrangement the rope is not affected by the turning of the crane-member on its axis. The rope passes over a pulley 16 carried by any suitable supports 17 fixed to or present on the ship, and may be fastened in any convenient manner, as by a belayingcleat 18.

A chain 19, provided with one or more rings 20 and 20, has its ends fastened respectively to a collar 21 on each of the supports 17 and a similar collar 21 at the upper end of each tube 5. Adjustment of the length of the chain 19 is provided by means of a hook 22 on the cap-nut 10 of the tube 5, over which hook any desired ring20 or 20 of the chain 19 may be slipped.

The operation of the d evice is as follows The boat 11 is normally supported in an in-board position, as shown in full lines in Fig. 2 of the drawings. When it is desired to lower the boat over theside of the ship, the crane members 8 are first rotated on their axes in their socket supports 5, to bring the boat into an out-board position, as shown in dotted lines at 11 in Fig. 2. The rope 13 is then slackened, and the weight of the boat and the overhanging cranes 8 causes the entire davit to swing outwardly and downwardly, away from the ship, until the boat occupies the position shown in dotted lines at 11 in Fig. 2. The chains 19, the length of which has been previously adjusted by the means described above, now hold the davit from further movement, and the boat is then lowered, by further slackening of the rope 13, clear of the side of the ship. The exact opposite of this process is followed in hoisting the boat onto the ship.

I have herein described my davit as used for supporting or lowering or hoisting ships boats. It may be applied, however, to a stationary dock instead of to a ship, and it may be used for supporting, hoisting, or lowering objects other than boats, Without in any Way aecting the essentialsfoi:I the invention.

1 claim A l. A davit comprising a rotatably mount# ed horizontal member having its` ends upturned; a yvertical tubular member fitted over each of said up-turned ends and aiiXed thereto; a vertical crane-member freely fitted within each of said tubular members to leave a vspace therein for a lubricant and adapted to rotate L on its aX-is Within said tubular member a :cap at the upper end of `each tubular member to retain the lubricant therein and to'exclude Waterftherefrom; and means for controlling the rotation of said horizontal member to causethe entire structure to swing outwardly and downwardly;

2. A davilJ comprising` a rotatably mounted horizontal member having tubular upturned ends; a vertical crane-member arber; land, means for varying the operative length of said chains.

In testimony whereof I have signed my name to this specication in the presence of two subscribing Witnesses.

EDGAR F. SANFORD.

Witnesses WM. F. BOOTH, D. B. RICHARDS.

Copies ofthis patent may be obtainedrfor ve cents each, by addressing the Commissioner or Patents, Washington, D. C.

Images