US1053047A - Boat hoisting and lowering apparatus. - Google Patents

Description

A. J. LEWKOWICZ.

BOAT HOISTING AND LOWERING APPARATUS.

APPLICATION FILED MAR. 19, 1912. RENEWED 030.41, 1912.

1,0533%? Patented Feb.11,,19 13.

4 SHEETS-SHEET 1.

A. J. LEWKOWIOZ.

BOAT HOISTING AND LOWERING APPARATUS.

APPLICATION FILED MAR. 19, 1912. RENEWED DEC. 21, 1912.

Patented Feb. 11, 1913.

4 SHEETS-SHEET 2.

"'Illllll illlll M E: [I a A. J. LEWKOWICZ.

BOAT HOISTING AND LOWERING APPARATUS.

APPLICATION FILED MAR.19, 1912. RENEWED DEC. 21, 1912.

1,053,047. Patented Feb. 11, 1913 4 SHEETS-SHEET 3.

A. J. LEWKOWIGZ.

BOAT HOISTING AND LOWBRING APPARATUS. APPLICATION FILED MAR. 19, 1912. RENEWED DEC. 21, 1 912. 1 ,053,07=

Patented Feb. 11, 1913.

4 SHEETS-8HEET-4.

- nosaoat,

marten I STATEd rarest orrren ANTHONY JOSEPH LEWKOWICZ, OF NEW YORK, N. Y., ASSIGNOR- TO THE MARTIN VIVIARINE LIFE SAVING DEVICES, LIMITED, OF TORONTO, ONTARIO, CANADA, .3.

CORPORATION OF ONTARIO, CANADA.

BOAT HOISTING- AND LOWERING APPARATUS.

Specification of Letters Patent.

Patented Feb. 11, 1913.

Application filed March 19, 1912, Serial No. 684,723. Renewed December 2 1, 1912. Serial No. 738,077.

To all whom 2'25 may concern:

Be it known that I, ANTHONY Josnrrr LEWKOWICZ, a citizen of the United States, and resident of the city, county, and State of New York, one of the United States of America, have invented certain new and useful Improvements in Boat Hoisting and Lowering Apparatus; and I hereby declare that the following is a full,'c1ear, and exact description of the same.

in my previous Patent a t-1,009,735, dated the 28th day of November, 1911, I, have shown and described a boat launching and stowing apparatus comprising a trackway and a davit crane associated with said trackway, the trackway imparting varying velocities to the fall suspension point of the davit crane in its path of travel while that part of the davit crane engaging with the trackway moves ata constant velocity along said trackway, and in the same patent, I have shown and described a hoisting mechanism,.; comprising a winding shaft, a winding drum, a brake drum, and a hoisting gear, wheel all keyed together so that they will revolve unitedly in the winding and unwinding movements of the davit falls.

In the actual use of the above described invention, I discovered that when hoisting a boat, I had made no provision for accelerat ing the winding motion of the winding drum independently of the hoisting gear, and that consequently I was unable to take up the slack of the davit falls resulting from the undulations of'the sea and the rolling 'of the ship, and one of the objects if my presentinvention, therefore, relates to the spe: cific construction of the hoisting mechanism wherebyan accelerated winding motion may be imparted to the windingdrum without interfering with or interrupting the contif nuity of the speed of the hoisting gear.

I also found from the actual use of my" patented invention, that a hoisting niecha-:

hoisting gear wheel and pinion, that they would revolve in an unwinding direction unchecked, and permit of the uncontrolled descent of the boat to the water, the rapidity of which would be such as to prevent any likelihood of the brake being applied in time to check it. To overcome this element of danger, is a further object of my inven-. tion, which I accomplish by the substitution of a worm wheel and worm for the hoisting gear wheel and pinion previously used, the wormwheel and worm being so arranged that when in mesh, they and the winding mechanism, when exposed to these elements, that 1 could not rely on obtaining atall times a uniformity of action during th lowering operations.

A further object of my invention, is therefore, to provide the winding and brake mechanisms with a substantially watertight casing, and to provide the fall ways with flexible water strippers to remove substantially the whole of the water lodged on the davit falls as they travel into the casing to be wound on the winding. drum.

A further object of my invention is to provide the casing with an eduction trap, and to so construct this trap that while it will permit of the egress of water, it will prevent the ingress of water'even under ordinary conditions of submersion.

In In previous patent, I have shown one end of the brake band to be permanently fixed to a stationary part of the davit crane, and I have shown theother end of the brake band to be provided-with a screw fitted with a threaded hand wheel, by which the tension to use a finely threaded screw in order.vv 1301;

obtain the necessary tension of the brake}.

band with the available manual power, but

this finely threaded screw'required a rela tlvely excessive motion of the hand wheel, and consequently it was impossible for .me

'to instantaneously check the unwinding revolution of the winding drum during the descent of the boat, which I subsequently found to be necessary to insure the proper launching of the boat under adverse conditions.

A further object of my invention, is there fore, to provide a sensitive control forthe .brake, so that. but relatively little power and movement of the hand wheel are necessary to instantly check the unwinding revolution of the winding'drum with the load on it.

A still further object of the invention is to arrange this control for the brake so that when the davit crane is at its outboard position, the control will be conveniently situated to the ships side to permit of the descending boat beingcont-inually in full view of the operator until launched.

In my previous patent, I fastened the ends of the davit falls to their respective divisions of the winding drum, but I' found that in thatconstruction, it was impossible to quickly and accurately adjust the length of one davit fallrelatively to that of the other,- and that in order to make the adjustment, it was necessary to undo one of the davit fall fastenings and reconnect the davit fall to the drum.

- To connect the davit falls to the winding drum so that there will be no necessity for viates the necessity of using fastenings for. connecting the davit falls to the winding detaching them therefrom during their adjustment,isa further object of my invention, and this I accomplish by using'a fall rope of sufficient length for the two davit falls, the rope interjacent its ends being freely passed through the rim of the winding'drum .on both sides of the center web dividing the drum into its several divisions until the proper adjustment is efiected. This obdrum, and adds an additional factor of safety, inasmuch as there are no fastenings to accldentally let go.

I 'also found in the field of actual use that when the davit falls were connected to'hang vertically from the boat, the pitchlng of the ship caused the boat to swing fore. and aft to a. greater or less extent betweenthe davit cranes when suspended by nating it, has the effect of reducing it sutficientlyto insure the safety of-its occupants while the boat is held suspended between the davit cranes.

For an understanding of my invention, reference is to be had.to the following description and. to the accompanying drawings, in which:

Figure 1, is a broken elevational view of the inboard side of the apparatus; Fig.2,

is a transverse sectional view on the line a-a Fig. 1; Fig. 3, is a sectional view on the line (2-?) Fig. 2; Fig. 4, is a sectional detail view of the brake control; Fig. 5, is a sectional detail view of the water stripper;

Fig. 6, is a sectional detail view of the eduction trap; and, Fig. 7 is a side elevation I showing the cam-shaped trackway and. one of thedavit'cranes.

Like characters of reference refer to like parts throughout the specification and drawmgs. I

Secured to the deck 1 of the ship,-are camshaped tracks 3, on which are mounted davit cranes 38 and 39, provided with thrust rollers 4 contacting the lower surfaces 5 of the tracks 3, and with driving wheels 6 and 'supporting wheels 2 contacting the upper surfaces 8 of the said tracks, the said driving wheels 6 being provided with conical teeth? engaging in corresponding cavities 1.03 in the tracks for the propulsion of'the davit cranes.

Extending from one dawit crane to the other is a shaft 9 on which the driving wheels6 are mounted, so that when motion is applied to the shaft 9, the driving wheels will revolve unitedly for the united.move- 'ment of the davit cranes along the tracks.

Mounted upon the shaft 9 is a worm Wheel lO rotated by a worm 11 fixed on the shaft 12. The shaft-12 can be turned by manually or mechanically operated means, but it is preferable to use manually operated means for turning it when heaving the davit cranes 'outboard,'and to use mechanically operated means for turning it when heaving themlnboard. The reason I prefer to use manually operated means instead of mechanically operated means, for turning the shaft 12 in heaving the cranes outboard, is that in the case of an emergency, it is necessary to effect the launching of the boat as quickly as possible, and as the source of power for mechanically operated means may be destroyed in the event of an accident, or as it may not be quickly available, and as time is the essence of safety in the event of a marine disaster, it is necessary to heave the davit cranes outboard as quickly as possible, and manually operated means under such cir cumstances are always immediately available. In heaving the davit cranes outboard, the weight of the boat suspended from the davit falls 45 andv 49, has a tendency'to pull the fall sus ension points of the davitcranes downwar and this downward motion of the fall suspension points, assists the motion applied to the driving wheels in moving the davit cranes to the outboard ends of the tracks 3. 4

Although it is possible to heave the davit cranes inboard by manually operated means, it is preferable to heave them inboard by power, owing'to the weight of the boat and its contents suspended from the davitfalls, and,in order to turn the shaft 12 and driving wheels 6 against the weight of the boat 30 and its contents, 1 use a pulley 99, which can be quickly slipped on the squared end of the shaft 12, and I transmit motion from a power source to the pulley 99 and shaft 12 by suitable means, such as rope or ropes 100. Thus, I am able to immediately heave the davit cranes inboard by mechanically operated means with theweight of the boat and its contents suspend- -ed from the davit falls.

The mechanism in the base of the davitcrane 39 is inclosed by a substantially watertight casing 66, and this casing 66 is provided with fall ways 66 through which the davit falls lead to the fall grooves 24 and 25 in a drum 19" mounted upon the winding shaft 20 journaled inthe sides of the casing 66. Forming part of the drum 19 is a smooth portion 21 constituting the braking surface, and this surface is engaged by the brake shoe 22 applied by the brake strap'23. Adjoining the braking surface 21 is a cylindrical part 19 having ratchet teeth 18 on its peripheral face to be engaged by thedogs l7 pivoted to the inner face of the annular worm wheel 16. The peripheral face of the worm wheel 16 is provided with worm teeth 15 engaged by the worm 14 when the worm and worm wheel are in mesh. The worm 14 is provided. with a shaft 13 slidably journaled at its inner end in a bearing 102 bolted to the casing 66, and at its outer end in a bearing 104 bolted to the davit crane .on the outer side of the casing 66. By slid ably mounting the shaft 13 in the bearings 104 and 102, the worm 14 can be moved into and out of mesh with the worm wheel, but the shaft 13 is never wholly withdrawn from the bearings 102 104. On the shaft 13 is a coniform worm 85 between the worm 14 and the vouter end of .the shaft.

To unwind the davit fails, it is necessary to have their full load on the drum 19 under absolute control of the brake strap 23 and its governing mechanism. hen the brake strap and its governing mechanisn'i have full control of the load on the drum 1,9, the worm 14 can be screwed out of mesh with the worm wheel 16 by turning the worm shaft 13 in the reverse direction ,to that for winding. As the worm shaft 13 is turned to unscrew the worm from mesh with the worm wheel 16, the grooves 84 in the coniform worm 85, which, are of the same pitch as the worm 14, are engaged by the pivoted lever 83. The turning of the shaft 13 in this reverse direction, causes the worm 14 towork itself to the right, as shown in Fig. ,2, until its last thread has come outof mesh with the teeth of the worm wheel 16. Then the engagement of the pivoted lever 83 in the grooves 84 of the coniform worm 85 continues the further movement of the shaft 13 to the right until the worm 14 is entirely clear of the teeth 15 of the worm wheel 16 when the pivoted lever 83 automatically drops down in front of the coniform worm 85 and locks the shaft 13 in its disengaged position, thus preventing any possibility of the shaft 13 accidentally movin to the leftand causing the worm 14 to fou the teeth 15 of the worm wheel 16 as the worm wheel revolves during the un-' winding operation.

When the worm 14 is in its disengaged position, the brake strap 23 is slackened until the drum 19 can revolve for the unwinding of the davit falls, the unwinding of which is caused by the weightof the boat 30 suspended from them. T heainwindbrake strap 23, and pivoted to another arm 610 is the other end of the brake strap, the arms 600 and 610 being angular-1y disposed to each other so that the turning of the shaft 58 to the left, will release the pressure of the brake shoe 22 on the brake surface 21 of the drum 19, and the turning of the shaft 58 tothe right, will apply it. Fixed on the shaft 58 is a lever 55, which, if desired,'may be extended as a hand lever. and when so extended, it is provided with a pawl 56 and a ratchet segment 57 to be engaged by the pawl 56 to lock the lever in its operative position. Pivoted on a pin 60 passing through the lever 55 is a forked link 61, carrying a trunnioned nut 63, and operating through the nut 63 is the upper half of a right and left threaded screw 62. the rower half of the screw 62 operating through a stationary nut 64 contained in a bracket 65 attached to the casing 66, and keyed on the lower end of the screw a hand wheel 67. By turning the hand wheel men ion that I only use the hand lever for possible for me to instantaneously check the revolution of the winding drum during the emergency purposes, should the mechanism, consisting of the screw 62 and hand wheel 67, become disabled or inoperative, and in order to provide for the action of the hand lever without disconnecting the screw 62, I provide the link 61 with slots 61 for the trunnioned nut 63. The movement of the hand lever can then efiect the movement of the link 61 when actuating the brake without being retarded by the nut 63.

I have already stated in this specification that in my previous patent, I used a finely threaded screw in order to obtain the necessary tension of the brake with available manual power, and that this finely threaded screw required a relatively excessive motion of the hand wheel which rendered it imdescent of the boat. To overcome the difiiculties arising from the use of the, finely threaded screw, I tried several unsuccessful experiments, one of which was the use of a screw having threads of a coarse pitch, but the manual power required to turn the hand wheel, robbed the brake of its sensitive control, in addition to which the pull of the screw on the nut due to the necessary tension on the brake strap to control the load, forcibly slackened the brake should the hand wheel be let go. I then conceived the idea of using the shaft 58 and providing itwith a double bell crank 59, to which I connected the ends of the brake strap 23, and I turned the shaft 59 by means of the lever provided with a link 61, nut 63, a singlethreaded screw, and hand wheel 67, but I experienced the same troubles that I previously experienced in trying to overcome the difficulties above mentioned. I then substituted for'the single-threaded screw the right and left threaded screw 62, and instead of using a single nut 63, I made use of the two nuts 63 and 64, as shown in Fig. 4, which gave me-a rapid, and consequently sensitive, control through the lever 55, shaft 58, and bell crank 59, over the brake strap 23, and through the fine pitch of the threads permissible under these conditions, I obtained a positive locking means for the brake in its adjusted position.

lVhen it is desired to launch the boat, the first operation is to heave the davit cranes outboard until they have reached the limit of their outboard position on the tracks 3.

trunnioned During this part of the operation, the worm 14is normally in mesh with the wormwheel 16 and the brake strap 23 and brake shoe 22 are tensioned to prevent the revolution of the drum 19, and obviate any possibility of the boat descending uncontrolled by the operator. \Vhen the davit cranes have reached their outboard position as shown in Fig. 7, the worm 14 is turned for disengagement from the worm wheel, and should the brake not have full control of the load,

the turning of the worm will permit the 'wheel, as previously described. When the worm is disengaged from the worm wheel, the hand wheel 67- is turned to the left, and the tension of the brake strap is relieved sufficiently to permit of the unwinding revolut-ion. of the drum 19 and the descent of the boat at any desired "speed. During the descent of the boat, the hand wheel 67 can be turned to the right and the tension of thebrake strap 23 and brake shoe 22 reapplied to the brake surface 21 of the drum 19 to arrest the descent of the boat at any desired place, this being necessary to prevent the launching of the boat until a favorable opportunity presents itself, the descent of the boat then being continued when the hand wheel 67 is again turned to the left.

Having fully described the launching of the boat, I will now describe the hoisting.

The davit cranes are still at their outboard position on the tracks 3, with the drum 19 free to revolve. The pivoted lever 83 is then raised to clear the front of the coniform worm 14, and the worm shaft 13 is pushed inward toward the bearing 102 until the first thread of the worm 14 engages one of the teeth 15 of the worm wheel 16. The worm shaft 13 is then turned until the worm 14 is fully in mesh with the worm wheel 16, when its further revolution may be continued, either manually, by means of a crank or hand wheel fitted on the shaft 13, or by mechanicalmeans, such as a pulley 99 driven by a rope drive 100 from some power source (see Fig. 7), the continued revolution of the shaft 13 causing the winding revolution of the gear wheel 16. During the winding revolution of the gear wheel 16, the dogs 17 engaging with the ratchet-teeth 18, cause the winding revolution of the drum 19 which has the effect of winding the davit falls in the fall grooves or chan-- nels 24 and 25 until the boat is hoisted to the desired elevation for heaving inboard.

In the event of the sea running'high, the

boat 30 is liable to be raised on a crest of a wave faster than the hoisting mechanism is winding the davit falls, causing them to erable to.tighten the. brake strapand brake .7 shoe against the brake drum to prevent any.

I possible unwinding revolution of the drum suddenly slacken. As the weight of an ordinarily loaded boa-t varies from nine to twelve thousand pounds, the jerk or strain caused by the sudden descent of the boat on a receding wave, renders the davit falls liable to the danger of breaking, if compensating means are not provided for rapidly taking-up the slack independently of the ordinary winding revolution of the worm wheel and drum 19*. To effect the rapid revolution of the drum 19 independently of the revolution of the hoisting worm gear 14, 1G, I have provided the drum 19? with t-hecylindrical part 19 and ratchet teeth 18, and have provided the internal surface of the hoisting worm wheel 16 with pivoted pawls 17. The engagement of the pawls 17 with the ratchet teeth 18 causes the united revolution ofthe drum 19 with the hoisting worm wheel 16 and permits of the accelerated winding revolution of the drum l9 independentlv of the speed of the winding revolution of thehoisting worm wheel 16. To provide for the accelerated revolution of the drum 19 1 have extended the shaft 20 beyond the casing 66, and have provided the shaft 20 with a hand wheel 88. While a slack is occurring in the davit falls, the hand wheel 88 is turned to rapidly revolve the shaft 20 and'drum 19 to rapidly wind the davit falls and keep them taut as the boat is raised on the crest of a wave, thus, not only preventing any possibility of the boat dropping and straining the davit falls as the wave recedes, but also effecting a saving of time int-he hoisting ofthe boat when the ship is in a heavy sea, which is of the utmost importance owing to the liability of damage to the boat while the ship is rolling. "When the boat is fully hoisted, it is pref 19*, although under ordinary conditions of use, the meshing of the worm 14 with the worm Wheel 16 is sufficient for that purpose.

When the boat is hoisted sufficiently for heaving inboard, the pulley 99 with the ro e h I the outer end of the metal tube 90, the metal drive 100 may be readily shifted from t.

squared end ofthe shaft 13 to the squared end of the shaft 12, and then, by means of the worm 11, worm wheel. 10, shaft 9 and driving wheels 6, the davit cranes will be moved to the inboard ends of the tracks 3' material, I can, under dry conditions, ob-

tain an extremely sensitive control of the unwinding revolution of the drum 19 through the-medium of the hand wheel 67 and its related parts. I have also used in the composition of my brake shoe other materials, such as leather, fiber, different metals, and side-grained woods, but none of these other substances gave me as effective control over the drum 19 as the end-grained blocks of oak. I am aware that there is nothing of a novel character in the material used in the composition of the brake shoe, but I am mentioning the use of all these materials to show that I have conducted a large number of experiments mainly for the purpose of'overcoming the unreliable action of the brake when wet, and I discovered as a result of my investigations, that the coefficient of friction when the brake is dry, initially increased in the case of wood, and constantly decreased in the case of metal and fiber, when wet, andthe leather is entirely too short-lived for brake purposes. I also discovered that when the wooden brake shoe is wet, there is an apparent suction on the brake surface 21, and this suction, to-

gether with the initial increased co-etiicient of friction, necessitate-an excessive slacken ing of the brake strap for the unwinding revolution of the drum 19*, and I also discovered in the case of metal, that the constantdecrease-in the co-efi'icient of friction,

for a proper control of the launching of the boat, and I also discovered, that owing to the increased coefficient of friction in the case of wooden brake shoes, and the decreased co-efiicient of friction in the case of metal and fiber, that it is impossible to obtain a uniformity of action of the brake permitted the drum to revolve toorapidly with an educt-ion trap 70. Each of these 5' water strippers consists of a flanged sleeve 93, bolted, riveted, or otherwise secured to;-

the casing 66 in line with the fall ways 66 a flexible metal tube 90 connected to the flanged sleeve 93, and a metal sleeve 92 at sleeve 92 snugly fitting'the davit fall, and

the diameters of the sleeve 93 and flexible;

metal tube 90 being larger than that of the davit fall to permit of its fiexions.

- The davit fall which I prefer to us-e,'1s a galvanized wire rope coated with grease filling its spirals, this grease, as the davit pass into the casing 66 with water adhering to them, the water will be precipitated to the bottom of the casing by the winding of the davit falls in the fall channels 24 and 25, and to provide for the drainage of this 5 water, I use an eduction trap 70 suitably secured to the bottom 78 of the casingv 66. This-eduction trap I provide with angularly disposed eduction ports 72, 73, 75 and 81, through which the water can pass out i of the casing, the induction of the water through the same ports into the casing be ing prevented by a ball float 74 located between the eduction orts 75 and 73.

The two davit fal s 45 and 49 are formed from-the same piece of rope 46, one end of WhlCh is suitably attached to the block I carried by the davit crane 38, and from the block 35, the rope passes downward, and through a block 33 and then upward and through said block 35, fI'OIII WlIlChfit leads to the block 36 'carried by the davit crane .39, then through said block 36 and through the water stripper 41 to thetall groove 25 in the drum 19. Through the drum 19 at the bottom of the fall groove 25 is a hole 25 and at the bottom of the fall groove 24 is a similar hole 24. The rope 46, when passed through the holes 25, 24*, leads out through the water stripper 42 and'through the block 50 carried by the davit crane 39 and then downward and through the block 34 from whence it passes up again to the said block 50, to which its other end is secured. That part of the rope extending from the fall constitutes the davit fall 45, and that part of the rope extending from the fall "groove 24 through the blocks 50 and 34, constitutes the davit fall 492 It is obvious that by possible to correctly effect the adjustment of their relative lengths by merely slipping the rope 46 through the holes 25 and 24* when the davit falls are unwound from-the fall grooves 25 and 24.

Heretofore it has been customary to have the davit falls hang vertically for attachment to the boat 30. I have found, however, that in this case, the boat, when raised from the chocks, will swing fore and aft with the-pitching of the ship, and that the boat is not onl in danger of being damaged, but the diflicuiizy of safely heaving the boat out to a launching position, is unnecessarily great, and this danger and difliculty is much greater in heaving the boat back to an inboard position. To largely overcome this anger and difficulty, I have connected the the davit falls 45 and 49 will lead obliquely y from the blocks 35 and 50 to the boat hooks 31 and 32. In this way, I am able to stay the boat to a considerable extent against the foreand aft swing, and I am also able to distribute the strain of the load on the boat groove 25 through the blocks 36, 35 and 33,-

this arrangement of the davit falls, it is "boat hooks 31 and 32 to the boat, so thatto the hooks 31 and 32 in the ratio of the square of the distance of the boat hooks from each other to the square of the loaded length of the boat, thereby relieving the diagonally leading davit falls, I provide a horlzontal brace 101 extending from one davit to the other near their 'upper ends.

Having thus fully described the nature ofmy invention, what I claim as new and desire to secure by Letters Patent, is:

1. In a boat hoisting and lowering apparatus, the combination of the davit falls, a drum on which said falls may be wound, abrake associated thewith, controlling the unwinding revoluti n of said drum, and means to rotate sa'd drum arranged to be moved into and o t of operative relation with it, said rotatin means being prevented from moving to its inoperative position until said drum is under the control of said brake.

2. In a boat hoisting and lowering apparatus, the combination of the davit falls, a drum on which said falls may be Wound, a brake associated therewith, controlling the unwinding revolution of said drum, means to rotate said drum slidable into and out of operative relation with it, and means to slidably move said rotating means from its operative to its inoperative position, said rotating means beingprevented from moving to its inoperative position until said drum is under the control of said br'ake.

3. In a boat hoisting and lowering apparatus, the combination of the davit falls, a drum on which said falls may be wound, a brake associated therewith, controlling the unwinding revolution of said drum, means to continuously rotate said drum in a winding direction during the winding of the falls, said means being arranged to be moved into and out of operative relation with the drum, and means for accelerating the winding rotation of said drum without affecting the speed of said continuously rotating -means, said rotating means being prevent-- ed from moving to its inoperative position until said drum is under the control of said I brake. 4. In a boat a drum on which said falls may be wound, said drum having a braking surface, a brake associated therewith, controlling the unwinding revolution of said drum, means to rotate said drum to be movedinto and out of operative relation with it, a casing in'closing said drum and brake and rotating means, and means associated with said casing to strip the .water from said falls as hoisting and lowering ap-. paratus, the combination of the davit falls,-

they wind therein, said rotating means being prevented from moving to an inoperative position until said drum is under the control of said brake.

5. In a boat hoisting and lowering apparatus, a davit-crane, a winding drum associated with said crane; davit falls't-o be wound on and unwound from said winding drum, and a brake control for said winding drum, comprising a shaft, a brake strap associated with the winding drum having its ends connected to said shaft, a 'lever fixed on said shaft, a nut connected with said lever, a stationary nut, and a double-thread ed screw operating through said nuts.

6. In a boat hoisting and lowering apparatus', a davit crane, a winding drum associated with said crane, davit falls to be wound on and unwound from said winding drum, and a brake control for said winding drum, comprising a shaft, a brake strap associated with thewinding'drum having its ends connected to said shaft, a lever fixed on said shaft, a nut connected with said le ver, a stationary nut, a double-threaded screw operating through said nuts, and means for turning said screw.

7. In a boat hoisting and lowering apparatus, a davit crane, a winding drum associated with said crane, davit falls to be wound on and unwound from said winding drum, and a brake control for said winding drum, comprisinga shaft, a brake strap associated with the winding drum havin its ends connected to said shaft, a lever nxed on said shaft, a link suspended from said lever', a trunnioned nut carried by said link, a stationary nut, and a double-threaded screw operating through said nuts.

8. In a boat hoisting and lowering ap paratus, a davit crane, a winding drum associated with said crane, davit falls to be wound on and unwound from said winding drum, and abrake' control for said winding drum, comprising a shaft, a brake strap 'associated with the winding drum having its ends connected to said shaft-,a lever fixed on said shaft, a link suspended from said-lever,,a trunnioned nut carried by said link, a stationary nut, a double threaded screw operating through said nuts, and means for turning said screw.

9. In a boat hoisting and lowering apparatus, a davit crane, a winding drum associated with said crane, davit falls to be wound on and unwound from said winding drum, and a brake control for said winding drum, comprisinga shaft, a brake strap associated with the winding drum having its ends connected to said shaft, a lever fixed on said shaft, a link suspended from said lever, a trunnioned nut carried by said link, a stationary nut, and a double -thread'ed screw operating through said nuts, said link being slotted to permit of its movement under the influence of the lever without impedance by the screw and nuts.

10. In a boat hoisting and lowering apparatus, a davit crane, a'davit fall, means for winding'the davit fall and permitting it to unwind, a water-tight, casing inclosing the winding means, and means to remove the water from the davit. fall as it winds into the casing. 11. In a boat hoisting and lowering apparatus, the combination of a winding drum, a brake associated therewith controlling its unwinding revolution, a worm wheel for causing the winding revolution of said drum, a pawl and ratchet connection between said worm wheel and drum, and a longitudinally movable worm adapted to engage and disengage said worm wheel when the winding drum is under the control of the brake.

12. In av boat hoisting and lowering apparatus, the combination of a winding drum, a brake associated therewithcontrolling its unwinding revolution, a worm wheel for causing the winding revolution of said drum,a pawl and ratchet connection between said worm wheel and drum, loi

tudinally movable shaft having a worm to' brake, and means for moving the worm clear of the worm wheel when disengaged therefr cation.

13. In a boat hoisting and lowering apparatus, the combination of a winding drum, a brake associated therewith controlling its unwinding revolution, a worm wheel for causing the winding revolution of said. drum, a pawl and ratchet connection. between said worm wheel and drum, a ion gitudinally movable shaft having worm to engage and disengage said worm wheel when the winding drum is under the control of the brake, and means for moving the worm clear of the worm wheel when disen- 'gaged therefrom, and then looking it in its disengaged position, comprising a supplemental worm on said draft, and a pivoted lever engaging with the supplemental worm.

' 14. In a boat hoisting and lowering apparatus, the combination of a winding drum, a worm wheel associated with said drum to rotate it in a winding direction, a pawl and ratchet connection between said worm wheel and drum, 'a longitudinally movable worm to engage and disengage said worm wheel, means for moving said worm clear of said Worm wheel when disengaged therefrom,

and a brake associated with the winding drum to control its unwinding revolution.

15. In a boat hoisting and lowering apparatus, the combination of a winding drum, a

brake associated therewith controlling its unwinding revolution, a worm wheel for I0- and then locking it in its disengaged tinuously rotating the drum during the winding of the davit falls, comprising a worm wheel, a pawl and ratchet connection between the worm wheel and drum, and a longitudinally movableworm to engage and disengage the worm wheel, means for accelerating the windin operation of the drum without affecting the speed of the continuously rotating means, and a brake associated with said drum to control its unwinding revolution when the worm is disengaged from the worm wheel. I

17. In a boat hoisting and lowering apparatus, the combination of the davit falls, a

'drum to wind saidfalls, means for continuously rotating the drum. during the winding of the' falls, comprising a worm wheel, a.

. pawl and ratchet connection between the worm wheel and drum, and a longitudinally movable worm to engage and disengage said worm whee-l, means for accelerating the winding motion of sald drum when said falls become slack, without affecting the speed of the worm wheel, and a brake associated with said drum to control its unwindin'g revolution when saidwbrm is disengaged from said worm wheel.

18. In a boat. hoisting and lowering apparatus, the combination of a winding drum, a brake associated therewith, a worm wheel, pawl and ratchet connections between the winding drum and worm wheel, a longitudinally movable worm for engaging and disengaging said worm wheel,'alever controllin said brake, means actauting said lever,

ratus; the combination of a winding drum, a.

brake associated therewith, a worm wheel, pawl and ratchet connections between the winding drum and worm wheel, a longitudinally movable worm for engaging and dis-- engaging said worm wheel, a lever controlling sald brake, a screw for actuatlng said lever, and means for long tudmally moving the worm to clear the worm wheel when disengaged therefrom, comprising a supplemental worm, and a pivoted lever movable into and out of operative relation with the supplemental worm.

20. In a boat hoisting and lowering appaL- ratus, the combination of a winding drum, a brake. associated therewith, a worm wheel, pawl and ratchet connections between the drum and worm wheel, a longitudinally movable worm for engaging and disengaging said worm wheel, I a lever controlling said brake, means actuating said lever, means for longitudinally moving said worm to clear said worm wheel when disengaged therefrom, and then locking it in its disengaged position, and a water-tight casing inclosing saidparts.

21. In a boat hoisting and lowering apparatus, a davit crane, a davit fall, means for winding the davit fall and permitting it to unwind, a water-tight casing inclosing the winding means, and means to strip the wa- I ter from the davit fall as it enters said casing, comprising a sleeve secured to the easing, a flexible tube secured to the sleeve, and a1eetal tube at the outer end of the flexible tll I V Toronto, February 21st, 1912. n ANTHGNY JOSEPH LEWKOWICZ.

Signed in the presence of GHAs. H. R oHEs, EDWARD P. BERNSTEINE.

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