US1099645A - Raising and lowering gear for ships' boats. - Google Patents

Description

J. GRAHAM.

RAISING AND LOWERING GEAR FOR SHIPS BOATS.

APPLIOATION FILED JUNE 9,1913.

1,099,645. Patented June 9, 1914.

2 SHEETS-SHEET l.

J. GRAHAM.

RAISING AND LOWBRING GEAR FOR SHIPS BOATS.

APPLIOATION FILED JUNE 9, 1913.

1,099,645. Patented June 9, 1914.

2.;51TEETSSHBET 2.

COLUMBIA PLANOGRAPH CO..WAS|IINGTON. D. c.

JOHN GRAHABE,

on EBB-OX,

G-LASGG'], SCOTLAND.

RAISING AND LGVfElR-ING GEAR F0131 SHIPS BOATS.

i ,ooaeis.

Specification of Letters Patent.

Patented J one 9, 1914:.

Application filed June 9, 1913. Serial No. WZA'YQ.

To all whom may concern Be it known that 1 JOHN GRAIUUI, a citivccn of the United States of time ca, residing at lbrox, Glasgow, Scotland, have invented certain new and useful Improvements in Raising and Lowering Gear for tlhips Boats of which the following is a specification,

This invention relates to boat raising and lowering gear of the class in which a single davit is employed said davit turning about a Vertical axis and having winding gear thereon preferably adapted to be operated in anu ally.

tinder the present invention instead. of having a single rope which is wound upon a drum operated by gearing and prrwided with a hand operated brake, I employ a chain which is arranged to pass over a chain wheel and be actuated thereby and has one end attached to the da it structure while the other end is adapted to be paid into or out of the lower end of the dayit which is made hollow so as to form a suitable chain receiving space or locker. Pref eraloly, the chain is arranged to pass over guide pulleys in the upper part of the davit to the chain wheel aforesaid which is on a spindle carried on the darit and driven by spur or other gear from a driving shaft operated by a crank handle or handles. From the chain wheel the chain passes up and over a secoud'chain wheel and then downward into the interior of the davit, The second chain wheel is preferably provided'with a guard or muzzle suitably arranged to pre vent the chain jumping on the wheel.

In connection with the winding gear, .l employ a self sustaining brake of the differential pattern and which is adapted automatically to hold the boat in any position during the raising or lowering operation should the operators let go the handles or be washed away from their posts.

The invention also comprises other novel features hereinafter described and pointed out in the claims.

A preferred form or embodiment of the invention is illustrated, by way of example, on the drawings ap 'icnded hereto and founing part of this specification.

On the drawings: Figure 1 is a side view of the davit showing a boat raised off the checks ready for lowering. liip'. is a detached rid-e -view to an enlargi-ad sale of the winding and brake mechanism. is \ided with a view of the winding and brake mechanism as seen in the direction of the arrow to Fig. 2. Fig. -il-. is an elevation and Fig. 5 a plan of one form of locking device for the davit. Fig. (l is a plan of a modified form of dayit locking device. Fig. 7 is a View showing the boat sling attached to a boat and Figs. 8 and 9 are detail views of a partof the boat sling. Fig. 10 is an enlarged View of the hook 59.

:l n cal-lying the invention into effect or practice in the manner illustrated. by the accompanying drawings, the dayit 10 is built up of steel plates 70 strengthened by angle irons 71, bent to the necessary shape and united by metal lattice work 72 and is provided with, a pair of side checks or brackets 11 in which is rotatably mounted a winch shaft 12 having securely mounted thereon, between the cheeks 11 a pinion 13 and, ex ternal of the cheeks 11, a pair of winch handles 14;. The pinion. 13 meshes with a second pinion 15 rotatably carried by a pin 16 secured to, and projecting inwardly from, the right hand check 11. A shaft 1'7 is r0- tatably carried by the cheeks 11 and has securely mounted thereon a spur wheel 18, a pinion 19 and a brake drum 20. The spur wheel 18 meshes w'th the pinion l5 and the pinion 19 meshes with a spur wheel 21 on a pulley shaft which is rotatably mounted in the cheeks l1. and carries, securely mounted thereon, a chain driving pulley The brake drum is embraced by the brake band 24; of a self-sustaining brake of the dilh-n'ential type and which may be adjusted or controlled by means of a screwed spindle mounted in bearing brackets :26 attached to the cheeks 11, a hand wheel 27 being pro vided for turning same.

Guide pulleys 28 and E29 and an idle pulley 30 are provided in suitable positions on the davit 10 and a chain 31, securer at one end to the davit at 32 and passing around the pulley 3 f of a movable fall 33, is passed over the guide pulley 29, guide pulleys 28, chain drijvin pulley 23, idle pulley 30 and the free end thereof passed into a chain stowage or locker 35 formed by the hollow lower end of the dayit. The guide pulleys 28 are preferably plain grooved. pulleys while the idle pulley 30 is a chain pulley and is also preferably provided with a guard or muzzle 63 to prevent the chain jumping thereon. Of course. any or all of the pulleys may be pro guard or muzzle if desired,

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while bosses 62 are also preferably attached l to the cheeks 11 at the places where the sev eral shafts are journaled therein in order to provide a larger bearing surface.

For the purpose of preventing a boat swinging outward, when .it is held suspended and the davitis being slewed, an arm 36 pivotally mounted on the davit l and pro- 13 which, through the medium of the gearvided at its outer end with a pair of guides or brackets -37 adapted to engage the gun wale or other suitable part of the boat in such a manner as to allow a certain amount of movement therehetween, thereby holding the boat in position relatively to the clavit but allowing it, at the same time, a certain amount of lateral movement.

In order that the davit may be locked in position when desired there is securely mounted thereon a journal or annulus 38 provided with a lateral snug or projection 39 upon which are pivotally mounted, in brackets l0, pawls ll adapted to engage holes e2 in the deck gland l3 through which the ournal 38 passes. Arms ii of a bifurcated link 4.5 may be pivotally secured to the pawls i1, said link being connected, at its upper end, with a lever to pivotally mounted on the davit- 10.

A modified form of locking device is illustrated at Fig. 6, whereon the davit is provided with a journal 38, gland 43 and lever .46 as aforesaid but in this case the snug or projection 39 is dispensed with and the holes %2 are replaced by radial slots 4-8. A pawl :tl, pivotally mounted on the davit 10 or journal 38, is adapted to engage the slots 48 formed in the gland a3 and is connected to the pivoted lever 46 by a plain link 4:9. The lower end of the davit 10 is mounted in a foot-step bearing 50 secured to a suit-able part of the ship, in the usual or any suitable manner. lYith this darit, boats are slung by means of converging brackets 51 rigidly secured to the bottom of the boat and passing through eye 1 rackets secured to the seats 53. Each bracket is jointed, by means of a tumbler bolt 55, to one end of a swing link 54' whose other end is jointed to a rigid member or link 56 which latter is again con nected, by means of a flexible member 57 with an eye or link 58 with which the hook 59 0f the fall 38 of the davit is connected. Each swing link has an arm or extension (30 thereon provided with a lateral guide eye or hook 61 of such shape as to allow the rigid member 56, which passes therethrough, a small amount of lateral play. lVith this arrangeinent when a boat is launched and the slinging tackle disconnected from the davit hooktlie rigid members or links 5% are held in place by the eye or hook 61 of the extension '60 until the tumbler bolts are re moved, thus preventing any injury to passengers owing to the fall of the slinging tackle whenit is disconnected from the davit.

lVhen it is desired to launch a boat the boat tackle is secured in position and the davit slowed until the link 58 can be passed over the hook The davit is then preferably locked by means of one of the hereinbefore described locking devices and the winch handles It turned in the proper direction. The turning of the handles let rotates the pinion ing hereinbefore described. rotates the chain 3 l s 1 u l driving pulley 23 whicn causes the chain 31 5 to raise the fall 33 and thereby lift the boat from the checks, the excess chain, instead of being wound around a drum, being paid into the chain receptacle or locker 35. lVhen the boat is raised sutliciently to clear the checks, the davit is slewed outboard and, preferably, locked in position and the boat lowered. To

; raise and stow a boat the operation is, of course, the converse of that aforesaid.

The hook 59 has a tongue (.35 pivoted thereto, at ($6, and provided with a heavier extension 67 this extension having a recess 68 with which a spring (59 on the body of the hook can engage. \Vith this construction when the link 58 is inserted in the hook 59 the downward pull depresses the tongue and brings the extension 67' into the position shown so that the spring 69 automatically engages the recess in the extension. Normally the action of the weighted extension 6? tends to raise he tongue and keep the hook open so that the link can readilv be engaged, and when engaged the hook is closed by the pull of the link. Should, however. the action of a wave lift the boat sufiiciently to take the pull 0a the link 58 the tongue cannot rise as the extension is held by the spring (39.

Should the operators leave their post, either when raising or lowering, and the 5'1 weight of the boatconnnence to pay out the chain, the self-sustaining or diflerential brake at once acts and brings the boat to a standstill. In the case of raising and lowering a light boat instead of having the one 11g end of the chain attached to the davit this end may simply han down free and be provided with a hook (thus doing away with the bottom block at its lower end) a check being provided on the chain at a short distance H5 from the hook to prevent it running through the pulley at the top of the davit.

if so desired the hoisting gear may, instead of being operated by hand, be operated by means of steam, hydraulic, electric or 129 other power, the power being applied to the shaft 12.

Having now fully described my invention what I claim and desire to secure by Letters Patent is 1. A ships davit hollow at its lower end, a chain wheel thereon, means for rotating said chain wheel, a second chain wheel, a guide pulley on the davit and a chain pass ing around the chain wheels and guide pul- 1 0,

.ley and having one end secured to the davit structure and the other end adapted to be paid into the hollow lower end of the davit. l 2. A davit having its lower part adapted a chain wheel thereon, means for rotatlng to be passed through the ships deck and be rotatably mounted therein, said davit being hollow at its lower end, a chain wheel thereon, means for rotating said chain wheel, a second chain wheel, a guide pulley on the davit and a chain passing around the chain wheels and guide pulley and having one end secured to the davit structure and the other end adapted to be paid into the hollow lower end of the davit.

3. A ships davit hollow at its lower end, a chain wheel thereon, means for rotating said chain wheel, a second chain wheel located above the level of the first chain wheel and directly above the hollow lower end of the davit, a guide pulley on the davit and a chain passing around the chain wheels and guide pulley and having one end secured to the davit structure and the other end adapted to be paid into the hollow lower end of the davit.

4;. A davit having its lower part adapted to be passed through the ships deck and be rotatably mounted therein, said davit being hollow at its lower end, means for locking the davit in desired positions, two chain wheels thereon one of which is located above the other, means for rotating one of said chain wheels, a guide pulley on the davit and a chain passing around the chain wheels and guide pulley and having one end secured to the davit structure and the other end adapted to be paid into the hollow lower end of the davit.

5. A ships davit hollow at its lower end, two chain wheels thereon one of which is located above the level of the other, means for rotating one of said chain wheels. a guide pulley on the davit, a chain passing around both chain wheels and the guide pulley and having one end secured to the davit structure and the other end. adapted to be paid into the hollow lower end of the davit and means for preventing the chain jumping oil the upper chain wheel.

6. A ships davit hollow at its lower end, two chain wheels thereon one of which is located alcove the level of the other, means for rotating one of said chain wheels, a guide pulley on the davit, a chain passing around both. chain wheels and the guide pulley and having one end secured to the davit structure and the other end adapted to be paid into the hollow lower end of the davit, means for preventing the chain jumping oil the upper chain wheel. a journal on the davit, a projection on said journal, pawls pivoted on said projection, a gland adapted to be secured to the ships deck and within which the journal is adapted to rotate, a flange on said gland having holes therein with which said pawls are adapted to engage and means for moving said pawls into or out of engagement with said holes.

? A ships davit hollow at its lower end,

said chain wheel, a second chain wheel, a guide pulley on the davit, a chain passing around the chain wheels and guide pulley and having one end secured to the davit strut-tn re and the other end adapted to be paid into the hollow lower end of the davit, and means whereby the movement of the chain is arrested should the winding mechanism he released when a weight is suspend ed from the chain.

8. A, ships davit hollow at its lower end, a chain wheel thereon, means for rotating said chain wheel, a second chain wheel. located above the level of the first chain wheel and directl; above the hollow lower end of the davit, a guide pulley on the davit and a chain passing around the chain wheels and guide pulley and having one end secured to the davit structure and the other end adapted to be paid vertically downward -from said second chain wheel into the hollow lower end oi the davit.

9. A ships davit hollow and tapered at its lower end, a chain wheel thereon, means for rotating said chain wheel, a second chain wheel, a guide pulley on the davit and a chain passing around the chain wheels and guide pulley and having one end secured to the davit structure and the other end adapted to be paid into the hollow lower end of the davit.

10. A ships davit made of an openwork structure and hollow througl'iout its length, guide pulleys arranged within the hollow davit, a chain wheel carried outside the hollow davit, a second chain wheel rotat-ably arranged within the hollow davit and above the level of the first chain wheel, a chain which is secured at its one end to the upper end of the davit and passes through the hollow davit and over the guide pulleys therein to and under the first chain wheel then up and over the second chain wheel and down into the interior of the lower end of the davit and means for rotating the first chain wheel.

11. A ships davit made of an openwork structure and hollow throughout its length. guide pulleys arranged within the hollow davit, a chain wheel. carried outside the hollow davit, a second chain wheel rotatably arranged within the hollow davit and above the level of the first chain wheel, a chain which is secured at its one end to the upper end oi" the davit and passes through the hollow davit and over the guide pulleys therein to and under the first chain wheel then up and over the second chain, wheel and down into the interior of the lower end of the davit, means for rotating the first chain wheel, a chain pulley block carried by the chain, said pulley block having a self looking hook thereon with pivoted extension therein and means for locking said extension.

12. A ships davit made of an openwork structure and hollow throughout its length,

guide pulleys arranged within the hollow I davit, a chain wheel carried outside the hollow davit, a second chain wheel rotatably arranged within the hollow davit and above the level of the first chain wheel, a chain which is secured at its one end to the upper end of the davit and passes through the hollow davit and over the guide pulleys therein to and under the first chain wheel then up and over the second chain wheel and down into the interior of the lower end of the davit, means for rotating the first chain wheel, a chain pulley block carried by the chain, said pulley block having a self locking hook thereon, with pivoted extension therein, means for locking said extension, a pair of rigid members, means adapted to connect said members to said hook a Jair of brackets pivotally connected with said links and adapted to be secured to a boat and means for holding said rigid members in extended position when they are disconnected from said hook.

l3. Slinging tackle for use in connection with a davit, such as described, comprising converging brackets adapted to be secured to a boat, swing links pivotally secured to said brackets and havin arms or extensions provided with lateral guide eyes or hooks, rigid members pivotally secured to said swing links and passing through said guide eyes or hooks and means adapted to connect said rigid members to the davit chain.

in testimony whereof I afiiX my signature in presence of two witnesses.

JOHN GRAHAM. lVitnesses 2 HUGH D. FITzrATRIcK, CECIL C. GALL.

Copter of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I U.

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