US810854A - Ship's davit. - Google Patents

Description

PATBNTED JAN. 23, 1906.

2 SHEETS-SHEET 1.

WVEWTOR J. W. GEOFF.

SHIPS DAVIT APPLIGATICSN FILED APR.24, 1905.

WITNESSES PATENTED JAN. 23, 1906. J. w. GROFP.- SHIPS DAVIT. APPLICATION FILED APR. 24, 1906.

2 SHEETS-SHEET 2.

l I I! x WITNESSES PATENT OFFICE.

JOHN W. eRoFr, or ALBION, MICHIGAN.

SHIPS DAVIT.

Specification of Letters Patent.

Patented Jan. 23, 1906.

Application filed April 24, 1905. Serial No 257,042.

To all whom it may concern.-

Be it known that 1, JOHN W. Gnorr, a citizen of the United States, residing at Albion, county of Calhoun, State of Michi an, have invented a certain new and useful Improvement in Ships Davits and I declare the following to be a full, clear and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanyingdrawings, which form a part of this specification.

This invention relates to ships davits, and has for its object an improved crane em ployed for lifting and storing the small boats which are used in connection with vessels and for lowering and launching the same.

The crane which forms part of the inven tion of this device is supported by hinges either to the deck or to a truck-support that can be moved on the deck. From the hinge the crane reaches for a distance substantially parallel with the deck under the space which is occupied by the boat when stored and on the side of such space which is opposite to the hinge curves and rises, and the extreme upper end curves forward and reaches to .a line which is vertically substantially above the middle of the boat that is stored in the device. The crane is provided with appliances which turn it on its hinge or pivot until its top end projects and swings the boat entirely out from its seat to a position to be lowered directly into the water at the side of the vessel. It is also provided with appliances by which the lowering of the boat is effected.

Other details of the improvement will be explained at length.

In the drawings, Figure 1 is an end elevation of the raising and lowering device. Fig. 2 is a plan. Fig.3is aside elevation. These drawings are rather diagrammatic and pictorial. Fig. 4 is a detail of a securing-hook, side view. Fig. 5 is a front view of the same. Fig. 6 is a detail of the hook by which the boat is attached.

There are preferably two crane-arms, although for small boats a single crane-arm placed midway the device can be used satisfactorily.

1 indicates a standard which rises from the deck and to which is pivotally connected a curved crane-arm 2, that extends from the pivot 3 horizontally under that part of the device which will be occupied by the boat eled nut 5, through which engages a screw 6, the head of which is pivoted on a horizontal shaft 7. The screw is provided with a mitergear 6 that meshes with a miter-gear 7* on the horizontal shaft 7. The horizontal shaft 7 is driven by a cross-shaft 7 that extends forward to that side of the device to which the arms are pivoted and is provided with means for rotating it at that point. The means shown in the drawings consist of a sprocket-wheel 7, that is connected by a chain 7 d to a winch-driven sprocket-wheel 7 the winch being fixed at a convenient elevation on thehousing of the vessel and in a convenient place for access thereto.- As shown in the drawings, this hand-winch is on the side housing of the cabin at a convenient elevation above the main deck, the entire apparatus being mounted to swing the boat clear from the main deck when the crane part of the davits are swung on the pivots 3 to swing the normally horizontal part 2 to a vertical and the normal vertical part 2 to a horizontal.

The boat is hung by lines 9, which are actuated by a lifting-line 10, that passes over sheaves 10 10 10 10 and 10 to a drum 11 on a horizontal shaft 12. The horizontal shaft 12 is actuated by miter-gear or spiral gear 13 or in any other suitable way, which is itself actuated by ahand-winch 14, properly mounted in journals to bring the winch in any convenient place for operation. That part 20f the crane which lies normally parallel with the deck forms a cradle for the boat 4, which is held therein by a clamp 15, fixed to the arm, and by a pivoted clamp 16,which clamp 16 is pivoted to a lever 17 and the lever pivoted to a support 18 from the deck. The pivoted end of the clamp 16 oscillates around the pivot 17 by which the lever 17 is held to a support 18, and takes a position, such as that shown in Fig. 4, with the pivot 16 swung beyond the center and in a position where the clamp is looked over the top of the boat.

In order to hold the boat by hooks which detach themselves from the boat, I connect the lines by a tie-rod 23. From the end of the tie-rod are lines 9, each terminating with a hook 9 of which the bill has only a quarterturn on the shank of the hook and the shank of the hook is made quite heavy. The bill is caught over a pin 43, that lies athwart the boat. These hooks will lift and sustain the boat, but will automatically detach themselves from it when the boat is supported from the under side, as by Water, and the lines are allowed to slack. An additional cradle of blocks 20 and 21 is advisable. If more than a single crane is employed, they are preferably braced and tied together by braces 22. m

What I claim is 1. In a hoisting device for boats, in combination with a pivoted crane fashioned to have supporting-lines for a boat suspended from the free end and with a projection intermediate the end portions for engagement over the gunwale of the boat, a clamp member pivoted to the crane-support and adapted to cooperate with said projection in securing the boat in place, means for swinging the crane on its pivot, and means for lifting and lowering a boat, substantially as described.

2. In a lifting device. for boats, in combination with a pivoted crane-arm carrying sheaves over which lifting-lines run and having a projection on its body portion adapted to engage over one gunwale of a boat, a clamping member pivotally connected with said crane'arm adapted to cooperate with said projection in holding the boat in a position of rest by engagement over the other gunwale of the boat, a screw actuator engaging through a swiveled knot on said cranearm whereby said crane-arm may be displaced from its position of rest, means wherey said screw may be actuated at a distance from said crane, and means for hoisting and lowering a boat suspended from the liftinglines, substantially as described.

3. I11 a lifting device for boats, in combination with a pivoted arm, a clamp on said pivoted arm, a clamp pivoted to the fixed part upon which the arm is pivoted, means for swinging said arm on its pivot, and means for lifting and lowering a boat connected with said arm but actuated independently thereof, substantially as described.

4. A davit for boats, having in combination a "curved arm pivotally secured .to a support and normally in a position of stable equilibrium with reference to the side of a ship, a pivoted clamping member adapted to cooperate with a portion of the arm in holding a boat in place therein, means for hoisting and lowering a boat suspended from said davit, and means arranged to be actuated independently of said hoisting means whereby said arm may be swung on its pivot, substantially as described.

In testimony whereof I sign this specification in the presence of two witnesses.

JOHN WV. GEOFF.

Witnesses:

CHARLES F. BURTON, l\/IAY E. Korr.

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