US2013690A - Hoisting mechanism - Google Patents

Description

sept. 1o, 1935. R, C. LAMOND 2,013,690

HOISTING MECHANISM Sept. 10, 1935. R, C -LAMOND 2,013,690

HOISTING MECHANI SM Filed Oct. 26, 1955 5 Sheets-Sheet 3 fnven for obere c Lammz By MM SeptnlO,y 1935. Rgc. LAMOND' 2,013,690

HOISTING MECHANISM 1 Filed Oct. 26, 1933 5 Sheets-Sheet 4 Sept. 10, 1935. R. c. LAMoND .2,013,690

HOISTING MECHANISM Filed Oct. 26, 1955 5 Sheets-Sheet 5 Hay/5 Sica-r fing h Reuse- Znvenor' Rober? CLczmoncZ By www Afor'ney Pneu-ted sept. 1o, 1935 nols'rnvG MEcnANisM Robert C. Lamond, Philadelphia, Pa., assignor to American Engineering; Company. Philadelphia, Pa., a corporation of Pennsylvania Application' October 26, 1933,l Serial No.` 695,272 17 Claims. (Cl. 212-39) This invention to control mechanisms vvi'or cranes or winches, and more particularly to control mechanisms for cranes or Winches of the eiectrohydraulic type.

The present invention, in the more speciiic sense, relates to boat and airplane handling appamtus employed on ships, orA on wharves, andconsists of a unit comprised of several electrohydraulic wlnches,`one of which is employed to swing the boom, another for the handling of boats, and a third for the handling of airplanes. in devices of this character it is well known that the load imposed upon the cable becomes greater as the boom approaches a horizontal position. Thus'when the boom has been swimg to one of its lower positions of adjustment the load im- `posed upon the cable may become so great as with the result1 mechanism comprising the present invention.

.to cause breaking of the cable that serious damage may occur.

,One object of the present invention is to provide a control mechanism for apparatus of the stated character which prevents such damage to the parts, and which has aociated therewith an adjustable valve mechanism which conditions the control for operation when the boom has been swung downwardly a predetermined distance. When the apparatus has been so conditioned, in case the load to be lifted by one of the winches exceeds a predetermined value, the winch will be rendered inoperative. The operator will then realize that in order tocarry the load the boom n'iust be moved toward vertical position before the object may be handled thereby. By this construction the danger of snapping of the cable is prevented.

AAnother object of the present invention is to Provide a limit control mechanism for each of the Winches of the unit, which functions when the cable is substantially full woimd o n or paid out from the asociated winding drum; the hydraulic transmission for driving the drum will be rendered inoperative. v

'A further object is to provide a control switch mechanism which functions to prevent starting of' the electric motor for driving the hydraulic ons under load.

ikturther .object of the present invention is to provide a compact control mechanism whereby the hydraulic transmissons for the several whiches are interconnected so that some of them be rendered inoperative when theload imposed upon one, exceeds a predetermined value, orwhenthe cable associated with any'of the .'winches is substantially fully'wound on, or paid out from the associated winding drum.

A further object is to provide a control mechanism of the stated character which is compact in form, and which is comprised of but a few simple parts.

Other and further objects of the'present in- 5 vention will become apparent as the description thereof progresses.

Oi the drawings:

. Fig. 1 is `an elevational view of the apparatus comprising the present invention. 10 Fig; 2 is an enlarged fragmentary view oi the hydraulic transmissions for driving the several Winches, and of the control mechanism therefor.

along line 8-6 of Fig. 5.

Fig. 3 is a plan Yview of the hydraulic transmissions for operating the several Winches of the 15 apparatus, and the motor for actuating said transmissions.

Fig. 4 is a plan view of a portion of the control Fig. 5 is a plan view of a portion ofthe control 20 mechanism shown in Fig. 4. Fig. 6 i s a sectional view taken substantially Fig. 7 is a plan view partly insection oi the hydraulic motor associated with the control`25 I tion showing the valve means for conditioning the a I control mechanism for operation.

Fig; 9 is a plan view of the switch operating 30.

mechanism comprising a portion of the control means shown in Fig. 4.

Fig. 10 is a side view taken substantiallyalong line Ill-I0 ofFig.9. V

Fig.. 11 is an elevational view taken substantial- 35 ly along line llil of Fig. 9.

Fig. l2 is a side elevational view of the control levers for the Winches.

Fig. 13 is an end view partly in section taken substantially-along line i3--i3 of Fig. 12.

Fig. 141s a fragmentary plan view oi` one of the drums showing the limit control means associatedtherewith.

Fig. 15 is a wiringdiagram ofthe control for the electric motor associated withV the mechanism for the Winches.

Referringto the drawings, the numeral I designates generally a crane comprising a mast 2` and a 'boom 3. The lower end of mast 2 is molmtedinathrustbearing l andextendsup- 50 wardly through a supporting structure 5, ma. chine platform 6, and an auxiliary platform 1. Platformsli andlaresecuredtomast! byany suitable means. 'Ihe mast 2 is provided wlthlateral thrust bearings 8 intermediate the ends 55 driving@v thereof which operate in a race 9 mounted at the upper end of a supporting bracket I8. The boom 3 is pivotally supported at the lower end thereof in bearing brackets II secured to the machine platform 6, as shown in Fig. 1. Mounted in a suitable framework I2 secured to brackets I8 is an internal gear I3 which meshes with a pinion I4. Pinion I4 is secured to the driven shaft I5 of an operating mechanism I6 for rotating platforms 6 and 1 and mast 2 ina well known manner. Operating mechanism I6 is secured to a framework I1 and machine platform 6 in any suitable manner. l

Operatively associated with mast 2 and boom 3 are three Winches I8, I9 and 28 respectively. Winch I8 is mounted in a suitable framework 2| secured to and extending upwardly from platform 1, and is employed for the purpose of swinging boom 3., Winches I9 and 28are mounted, respectively, in frameworks .22 and 23 secured to and extending upwardly from machine platform 6. Winch I9 in the present apparatus is employed for handling airplanes and will be hereinafter referred to as the airplane winch, while winch 28 is employed for handling boats such as tenders, and will be hereinafter referred to as the boat winch. A cable 24 extends upwardly from the windingdrum 25 of winch I8 and is trained around differential pulleys 26 and 21, the former being rotatably mounted in a bracket 28 secured to the top of mast 2, while the latter is similarly mounted in a bracket 29 secured to boom 3, and the end of the cable is secured to a bracket 30 secured to the upper end of mast 2, as shown in Fig. 1.

A cable 3| extending from the winding drum 32 of airplane winch I9 is trained around a sheave 33 rotatably mounted in suitable bearings provided near the upper end'of boom 3, and the end thereof is'provided with the usual hook 34. A cable 35 also extends from the winding drum 36 `of boat winch 28 and is trained over guide rolls 31 and 38 provided in boom 3, and thence around sheave 39 rotatably mounted in a bearing bracket 48 secured to boom 3 a short distance from the upper end thereof. The cable 35 is then trained around differential pulleys 4| and 42, and the end thereof is secured to a block 43 mounted on pulley 4|. Pulley 42 is rotatably mounted in a bracket 44 secured to boom 3, while pulley 4| is suspended therefrom by the cable 35, and the lower end of the block 43.mounted thereon is provided with the usual hook 45.

Winches I8, I9 and 28 are respectively driven by fluid motors M1, M2, and M3, through the associated reduction gearing designated generally by the numerals 46, 41 and 48. Fluid motors M1, M2, and M3 are operated by pumps P1, P2, and P3 through piping connections 49, 58 and 5I, as shown more particularly in Figs. 2 and 3. Pumps P1, P2, and P3 are interconnected for simultaneous operation by gearing'52 which in turn is connected by a chain and sprocket mechanism 53 to an electric motor 54, or to any other suitable driving mechanism. Pumps P1, P2. and P3, and motors M1, M2, and M3 are of the general type shown and described in the United States Patent No. 1,077,979

to which reference may be had for a full dis- 'I'he mechanism for controlling the operation of Winches I8, I9 and 28 will now be described in detail.`

Referring more particularlyto Figs. 1, 2 and 4, the stroke and direction of discharge of pumps P1, P2, and P3 are regulated by levers 55, 56 and 51 respectively. Levers 55, 56 and 51 are also operatively connected to a switch operating mechanism for electric motor 54 which prevents starting of the latter under load, as will appear hereinafter. 'Ihese levers are pivoted upon a shaft 58 secured to brackets 59 depending from platform 1, and are guided for -movement in the brackets 68 also secured to platform 1, as shown more particularly in Figs. 1 and 2. Levers 55, 56 and 51 have secured to the lower ends thereof, arms 6 I, 62 and 63, respectively, to which one end of links 64, and 66 are pivotally connected. The other ends of links 64, 65 and 66 are pivotally connected to arms 61, 68 and 69 secured respectively to one end of shafts 18, 1| and 12. These shafts are rotatably mounted in bearing brackets being pivotally connected to the stroke adjusting means 82, 83 and 84 of pumps P1, P2, and P3.

It therefore is seen that by means of the connections just described between levers 55, 56 and 51, and the stroke adjusting means 82, 83 and 84 of pumps P1, P2, and P3 respectively, the strokes of the latter may be adjusted in one direction by swinging the associated levers 55, 56 or 51 in a clockwise direction and in the reverse direction by swinging said levers in a counter-clockwise direction. Referring to' Figs. 2, and 4 to 6, it will be observed that shafts 18 and 12 have secured thereto near one end thereof depending arms 85 `and 86 respectively, while shaft 1| has pivotally mounted thereon a pair of depending arms 81 and 88. A vpair of links 89 and 98 operatively connect arms 86 and 81, and arms 85 and 88 respectively. Therefore, whenshaft 18 is rocked by lever 55, arm 88 will swing about shaft 1I a corresponding amount through its connection 98 with the arm 85 secured to the shaft 18. Likewise, when shaft 12 is rocked by lever 51, arm 81 will also be swung about shaft 1I through its connection 89 with the arm 86 secured to the shaft 12.

As shown in Figs. 2 and 7, a uid motor designated generally by the numeral 9| is suitably supported upon a bracket 92 in spaced relation with shafts 18, 1I and 12. Fluid motor 9| comprises a pair of cylinders 93 and 94 having pistons 95 and 96 respectively, operating therein. Pistons and 96 extend through the ends of cylinders 93 and 94 and abut against the inner sides of crossheads 91 and 98, respectively. Spaced respectively from crossheads 91 and 98 are crossheads 99 and |88. Crossheads 91 and 99 are ccnnected by a pair of tie rods IDI and |82, while crossheads 98 and |88 are likewise connected by a pair of tie rods |83 and |84. Tie reds |8| and |82 extend thrpugh and are guided in apertures provided in ears m4 and los integral with cylinder 93. i Tie rods |83 and |84 are likewise mounted in ears |86 and |81 integral with cylinder 94.

Ears |84 and |85, and crosshead 99 are provided with inwardly extending bosses which constitute spring seats for coil springs |88 and |89 which respectively encircle tie rods l| and 02, and spacing collars ||0 and extend between the ears |04 and |05 of cylinder 93 and crosshead 91.'

The ends of tie rods |0| and |02 are threaded to receive lock nuts ||2, which not only retain the cros'sheads in position but afford a means for varying the tension of springs |08 and |09. Ears |06 and |01 of cylinder 94 and crosshead |00 are also provided with inwardly extending bosses which act as spring seats for springs 3 and ||4, which encircle tie rods |03 and |04, respectively. A pair of spacing collars and ||6 are also provided between crossheads 98 and ears |06 and |01 of cylinder 94. The ends of tie rods |03 and |04 are also provided with lock nuts ||1 which serve a similar purpose to the lock nuts ||2 secured to the ends of tie rods |0| and |02. As shown in Fig. 2, the lower ends of arms 81 and 88 extend between crossheads-91 and 98 and are adapted to be engaged by the bosses ||8 and ||9 provided on lcrossheads 91 and 98 respectively.

A pair of pipes and |2| are respectively connected to the ends of cylinders 93 and 94.

These pipes are connected to a T-coupling |22 secured to one end of a pipe |23, the other end of which is connected to avalve |24 mounted in a bracket |25 secured to bearing bracket for the boom 3. A pipe |26 connects valve |24 with one of the pipes 5| leading from pump P3 to motor M3, and a third pipe |21 conducts the overow of valve |24 to a makeup tank (not shown). Pipe 5| of pump P3 is subjected to pressure when a load is imposed on the boat winch 20 and this pressure is communicated to valve 24 through the connections just described. When the boom 3 is in the position shown in Fig. 2, valve |24 is inoperative and thus no iluid will be delivered therethrough to cylinders 93 and 94 of motor 9|.

In order to condition valve |24 for operation the following mechanism is provided. Pivotally mounted on the upper end of an arm |28 extending upwardly from bracket |25 is a bell crank lever |29. A roller |30 provided at the free end of an arm |3| of bell crank lever |29 is adapted to engage in the cutaway portion |32 of a cam plate |33 secured to boom 3 when the latter is in its upper positions of adjustment, as shown in Fig. 2.V'ihegither` arm |34 of bell crank'lver |29 extends into a slot |35 provided in the block |36 secured to the upper end of valve stem |31. Valve stem |31 has secured thereto valves |38, |39 and |40 as shown in Fig. 8. When the parts are in the position shown in Figs. 2 and 8, valve |88 is closed and thus no fluid can pass through valve |24 to cylinders 93 and 94 of motor 9J, from pipe 5|. However, any fluid in said-cylinders can drain through valve |24 through pipe |21 to the' makeup tank. When the boom 3 is swung downwardly a predetermined distance the cam portion |33' of plate |33 will rock bell crank lever |29, causing the arm |34 thereof to lift Vvva`lves"|33, |39'and'i40, thereby establishing communication between pipes 5| and |23, and causing the pressure delivered by pump P3 to be delivered to cylinders 93 and 94.0f iiuid motor 9|. At the same time valve |40 closes the outlet-port of valve |24 leading to pipe |21. Fluid motor 9| is now conditioned for operation and when the pressure delivered by pump P3 exceeds the tension of 'the springs |08, |09 and H3, H4, associated therewith, pistonsV 95 and 96 will force crossheads 91/aid198 into engagement with arms 91 and 86 actuating the latter to normal position. By this action shafts 10 and 12 will be rocked to normal position by virtue of the connection oi the arms 85 and 86 respectively, secured thereto, with the arms 81 and 88, with the result that the stroke adjusting mechanisms 82 and 84 of pumps P1 and P3 will be actuated to normal no 1:-.5 stroke position, thus interrupting the pumping action of said pumps. `Extending between valve |38 and a packing plug |4| provided at the upper end of valve |24 is a. coil spring |42. Thus when the boom 3 has been swung upwardly a distance sufficient to cause the cutaway portion 32 of cam plate |33 to register with roller |30, spring |42 will urge valves |38, |39 and |40 downwardly, to normal position, seating valve I 38 and -thus shutting olf communication between l5 pipe 5| and uid motor 9|. Fluid, however, can drain from cylinders 93 and 94 through thel valve |24 to the makeup tank through pipes |23 and |21. By the mechanism just described, it is seen that in the event the Winch 20 is subjected to 20 unusually heavy loads when the boom 3 is in one of its lower posi-tions, pump P3, and consequently winch 20, will be rendered inoperative. Pump P1, and its associated winch I8 will also be rendered inoperative. This directs the attention of the 25 operator to the fact that the load is too great, for the mechanism to handle when the boom is in that particular position of adjustment. In order to carry the load the boom 3 must then be swung'toward vertical position to reduce the 30 length of the moment arm thereof and thereby reduce the load on winch 20.

Referring to Figs. 1, 4 and 14, it is seen that shafts 10, 1I and 12 have also secured thereto arms |43, |44 and |45, respectively.y Arm |43 35, is pivotally connected at the free end thereof to the lower end of a link |46, the upper end of which being connected to an arm |41 secured to a cradle |48 provided at one end of winch i0. Arms |44 and |45 are likewise connected to cradles 40 |49 and |50 of Winches |9 and 20 respectively, through links |5| and |52. Each of -the cradles |48, |49 and |50, and the mechanism associated therewith are similar in construction and operation so that a description of one will suiice for all. y

Referring to Fig.. 14, the shaft |53 of winding drum 25 has operatively associated therewith a screw Vslfft"|-54V havingVY secured -thereto in spaced relation a pair of stops |55 and 156. Mounted 50 for reciprocation on screw shaft |54 is a traveling, nut |51 having a pair of laterally extending projections |58 and |59 provided thereon which are adapted respectively to engage-stops |55 and |56. Traveling nut |51 is notched at -the sides 55 thereof to receive the sidelarms |60 and |6| of cradle |48 in such a manner that any rotary movement of said nut in either direction will impart a corresponding rocking movement to the cradle. The stops |55 and |56 are so spaced on 60 shaft |54 as 'to be engaged by the traveling nut |51 when the cable is substantially fully wound on drum 25 or substantially paid off therefrom. By this construction it is seen that when traveling nut |51 engages either of the stops |55 or |56 65 the cradle |48 will be rocked abou-t its pivotal connectionwith shaft |54 correspondingly. When the cradle is operated in this manner shaft10 will also be rocked inthe reverse direction from which it was operated by adjustment of ' lever 55, 70 and consequently the stroke adjusting mechanism associated with pump P1 will be adjusted to neu`- tral position. In a like manner, when the cables 3| and 35 of Winches |9 and 20 are either substantially fully wound on or paid oi from the 15:

associated drums 32 and 36, the cradles |49 and respectively associated therewith will eiect rocking of shafts 1| and 12 in the reverse direction fromwhich they are operated by levers 56 and 51, .thereby adjusting the strokes of pumps P2 and P3 to neutral position and thus rendering said pumps ineffective.

In case vthe strokes of pumps P1, P2, and P3 are adjusted to "on stroke position, as hereinafter described, before the electric motor 54 has been started mechanism is provided to open the switch to the said electric motor thereby preventing operation of the latter. The purpose of this mechanism is to prevent damage to thc parts, which may occur if the motor is started up under heavy loads. Referring to Figs. 4, 9 to 11, and 13, it is' seen that shafts 10, 1| and-12, have provided intermediate'the ends thereof a link and lever mechanism designated generally by the numeral |60 for actuating the interlocking switch |6| provided in the control circuit for motor 56.

- Switch |6| is of awell known construction and a detailed description thereof is unnecessary.

- Switch 16| includes an operating shaft |62 having secured to one` end thereof a depending arm |63 tothe free end of which is pivotally con-- nected one end of a link |64. The other end of link |64 is pivotally connected to the lower end of an arm |65 having a hub |66 integral therewith which is loosely mounted on shaft 10. Spaced from hub |66 is a second hub |61, also loosely mounted on shaft 10 and which has integral therewith a short depending arm |68. A pair of bolts |69 and |10 connect arms |65 and |68, the bolt |69 having anlanti-friction roller |1| rotatably mounted thereon. Secured to shaft 10 intermediate hubs |66 and |61 is a vertically extending arm |12 to which one end of a link |19 is pivotally connected. The other end of link |13 is pivotally connected to the vertical arm |14 of a cam member |15 loosely mounted on shaft 1|. Adjacent to one side of cam member |15 and spaced slightly therefrom is a vsecond cam member |11. Cam member |11 is also loosely mountedon shaft 1| and has integral therewith a vertically extending arm |18 to which one end of a link |19 is pivotally connected. The other end of link |19 is pivotal- 1y connected -to'the upper end 'of an arm |80 rigidly secured to shaft- 12. Y At the other side of cam member |15 is a third cam member |8| rigidly secured to shaft 1| as shown in Fig. 9. Cam members |15, |11 and |8| comprise slightly inclined arms |82, |83 and |84 respectively, extending between shaft 1| and anti-friction roller |1|. The right hand ends (Figs. 9 and 10) of arms |82, |83 and |84 are each provided with an arcuate end portion |85 concentric with shaftv 1|. Each end portion |85 has an arcuate cam notch |86 provided therein intermediate the endsthereof for receiving the anti-friction roller |1| mounted onbolt |69. By this construction it is seen that when any one of shafts,10, 1|, or 12 is rocked in-either direction, arm |65 will be rocked in a. counter-clockwise direction (Fig. 10) thereby rocking shaft |62 of switch |6| to open lsaid switch. Switch |6| will be retained in open position by the arcuate end portions |85 of arms |82, |08.or |84 until all of the shafts 10, 1| and 12 have returned to normal position, when the respective cam notches |86 register with roller |1I. Referring to Figs. 9 and '10, it is seen that hubs |66 and |61 are provided with weights |81 and |88 respectively, which, when the cam necessary. Current is supplied to electric motor 54 from bus bars L1 and L2 respectively, con- 10 nected to a line switch |90. A wire |9| leads from one of the poles of switch |90 to one end' of an automatic .starting resistor |92 for electric motor 54. A branch connection |93 having a switch |94 therein connects wire 9| with the 15 other end of starting resistor |92. A second wire |95 leads from the other pole of switch |90 to motor 54 and also has a switch |96 provided therein. Switches |94 and |96 are operated by solenoids S1 and S2 provided in an auxiliary cir- 20 cuit connected to switch |90 and designated generally by numeral |91. Solenoids S1 and S2 are controlled by starting switch |98 and stop switch |99 and interlocking switch |6|.

Thus, in order to start the operation of elec- 25 tric motor 54, starting switch |98 is closed.' Interlockng switch |6| must also be closed to complete the circuit from line switch |90 to solenoids Si and Sz. As hereinbefore described, all ofthe levers 55, 56 and 51 must be in normal position 30 before weights |81 and |88 can effect closing of switch 6|. Thus it will be impossible to start the operation of electric motor 54, unless all of the pumps P1, P2, and P3. are in neutral ineffective position, thereby imposing no load upon the elec- 35 tric motor 54. Upon closing of switches |98 and `I 6| solenoids S1 and S2 respectively close switches |94 andA |96 closing the circuit to electric motor 54 through starting resistor |92 which functions automatically to cut out resistances during starto ing of the motor, thereby gradually increasing the speed thereof. Switches |94 and |96 will now remain closed until stop switch |99 is closed, even though switch |6| is subsequently opened by operation of levers 55, 56 or 51. Thus when electric motor'54 has been brought up to full speed the Winches .|8, |9 or 20 may be operated by adjusting the strokes of pumps P1, P2, or P3 as hereinbefore described. To stop the electric motor 54 the operator simply closed switch |99 50 which through\th'auxiliary circuit |91 causesW switches |94 and |96 to open, thereby interrupting the circuit to said motor 54.

In order to prevent overloading of boom 3, mechanism is proyided to prevent simultaneous operation of winches I9 and 20. Referring to Figs. 12 and 13, a bracket 200, secured to shaft 58, extends upwardly therefrom between levers 56 and 51. The upper enlarged portion 20| of bracket 200 is provided with a transverse cylindri- 60 cal bore for receiving a lock pin 202. .The eX- tended at surfaces 203 and 204 of levers 56 and 51,' respectively, lie in close juxtaposition to the ends of portion 20|, and are providedwith circular recess 205 and 206, respectively, intermediate the sided edges thereof for receiving the I rounded ends 201 and 208 of pin 202 when the levers are in normal position. It therefore is seen thatVV if, foi-example, lever 56 is operated pin 202 will be shifted to the left (Fig. 13) causing 70 the rounded end 208 thereof to enter recess 206. The iiat surface of lever 56 will now engage the end 201 of pin 202 and thus hold the latter in locking engagement with lever 51, thereby. pre1 venting operation of the latter until lever 56 has 75 ||4 of motor been returned tonormal position. Lever 56 will be locked against movement in a similar manner in the event that lever 51 is rst moved from normal position. f

In order to retain the levers'55, 56 and 51 in normal position, each is provided with a manually operable latch 289,' the lower end of which engages in a notch 2|0 provided in the upper end of guide bracket 6|).

From the foregoing description it is thought that the operation of my improved device is obvious. However, in order to correlate the various' elements thereof a brief summary of the operation thereof will now be given. Let us assume that the levers 55, 56 and 51 are in normal position and that it is desired to swing the boom 3 downwardly so as to render the hooks 84 or 45 accessible to the crafts to be handled, The operator rst closes switch |98 to start the operation of motor 54 which in turn then operates pump P1, P2, and P3. Lever 55 is then unlatched and moved in thel proper direction, which movement is transmitted to shaft 10 through link 64 and arm 61, which in turn through arm 16, link 19 and stroke adjusting means 82 places pump P1 on stroke. At the same time, arm |43 will also be correspondingly rocked which through link |46 and arm |41 will tilt cradle .|48 associated with the drum 25 of winch I8. Pluiddischarging from pump P1 now drives the associated iluid motor' M1, which in turn drives winch I8 through the gearing 46. ,The windingdrum 25 of winch I8 will now be rotated to pay out cable thereby permitting the boom 8 to swi'ngdownwardly by gravity. When the boom has moved in this manner to approximately its lower limiting position, traveling nut |51 (Fig. 14) will have moved in such a direction as to cause stop |55 to engage projection |58 thereon, with the result that cradle |48 will be actuated to normalposition.' When this occurs pump P1 will be adjusted to neutral position through arm |41, link |46, arm |48, shaft 1|). link 19 justing mechanism 82. Arm |82 also be rocked to normal position wherein notch |86 registers with theanti-friction roller |1|. Weights |81 and |88 will now rock arm |65 in a clockwise` direction (Fig. 10) thereby closing switch 16|. Similar action takes place when Winches- I9 and 28 respectively, are operated. By this construction, itis clear that Winches I8, I9 and 28 may be operated independently oi' each other.

Now let us assume that boat winch -29 is in operation and the boom 3 boom has been operated in this manner, the cam plate |98 thereon rocks bell crank lever |29 about its pivot causing the arm |34 thereof to lii't valves |38, |39 and |48, and thereby permit the iluid pressure developed in pump P3 to pass through valve |24 to cylinders 98 and 94 oi' fluid motor 9|. 4The apparatus is now so conditioned that incase the load imposed upon the winch 28 exceeds. a predetermined value, the pressure developed by pump P will increase until it exceeds the tension of springs |88, |89, H8 and 9|, causing pistons 95 and 96 thereot to actuate crossheads 91 and 98, respectively, into engagement with levers 81 and 88. thereby actuating the latter to normal position. When this occurs shafts 18 and 12 will vbe rocked to normal position through the connections 89 and 89,!respectively, with levers 81 and 88, with the result that the stroke adjusting mechanism 84V and stroke -ad-4 of cam |15 will has been swung down-- wardlyl toone ci' its lower pomtions. When the tioning means .with said switch, ment of any ot the former from .driven members,

for rendering said o! said electric oi' pump P3 will lie-adjusted to neutral position. It pump P1- is also on stroke it is obvious that it also will be adjusted to neutral position when arms 81 and 88 are actuated by motor 9| 'as just described. It also is seen that cam me v:i bers |15 and |11 will alsobe adjusted to normal position causing the cam notches |86 therein to register with anti-friction roller |1|. Weights |81 and |88 will now swing arm |65 in a clockwise direction to close switch |6|. If it is desired 10 to stop the operation, of .motor 54 the operator simply closes switch |99, which in turn causes main switches |94 and |96 to open andthus interrupt the. circuit to said motor. Inasmuch as interlocking switch |6| is-'held in closed'position 15 by weights |81 and |88, electric motor 54 may again be started by simply closing switch |98. In case one of the levers 55, 56 or 51 is operated from normal position before switch |98 is rst closed, interlockingV switch |6| will be actuated 20 to open position and consequently electric motor 54 will remain at rest.

It therefore is seen that an effective control mechanismV has been provided which prevents y overloading of the apparatus and also prevents 2 6 damage to the driving motorand associated parts. While the apparatus herein described is admirably adapted to iulll the objects primarily stated, it is to be understood that it is not intended to limit the invention to the embodiment 30. herein shown since it may be embodied in other forms all coming within the scope of the claims which follow.

- What is claimed is:

1. 'In a device o! the class described, the com- 35 bination with a plurality of driven members, of a plurality of drivingmeans, one for each of saideach of said driving means com-- prising a iluid pump and motor, and automatic means for rendering one or more of said pumps inoperative when the load imposedupon the associated driven means exceeds a predetermined Y value, said automatic means comprisinga uid motor operatively connected to one of Vsaid pumps, and individual mechanical connections between said motor and some of said pump 2. In a device of the class described, the combination with a plurality of driven members, o! a plurality of driving means, one for each of said driven members, each of said driving means comprising a iluid pump and motor, an electric motor' for operating said Dumps, a switch for controlling the operation of said electric motor control means for each or said driving means, including means for -conditioning each of said pumps for operation, automatic means for rendering one or more of said pumps ineffective `when the' load imposed upon the associated drivenmember ex- .ceeds a predetermined value, additional means pumps ineiective when lsaid driven member has been operated a predetermined amount in either. direction, and mechanism operatively connectlngeach of said condl'- whereby move- 65, normal position, and thereby prevents starting e ,motor under load. 3.' In a device ot the class described. the combination with a plurality of driven inembers,i oi 70 a plurality of driving means, one for each ot said driven members, each of said driving. means comprising a fluid. pump and motor, an electric motor -for-actuating saidpumps, meansrfor conopens said switch ditioning each of said pumps for operation, 1au -7;5l:

tomatic means for rendering one or more of said pumps ineiective when the load imposed upon one of said' driven members exceeds a predetermined value, means operatively connecting each of said driven members With the conditioning means for the associated pump whereby said `pump will be rendered ineiective when said bination with a plurality of Winches, of driving means for each of said Winches comprising a `iluid pump and motor, an electric motor for driving all of said pumps, independent.means for Y controlling the stroke and direction of discharge of each of said pumps whereby each o'f said l Winches may be driven independently in either direction, automatic means for rendering two of said pumps ineiective when the load to which one of said Winches is subjected exceeds a preindependent means for controlling the stroke and direction of discharge of each of said pumps whereby the associated Winches maybe operated in either direction, automatic means for rendering `two of said pumps ineiective when the load to Whichone of said Winches is` subjected exceeds a predetermined value, limit control means operatively connecting each of said Winches to the stroke adjusting mechanism of its associated pump whereby said pump will be rendered ineffective when said Winch has been operated a predetermined amount in either direction, and mechanism operatively connecting said independent means with said switch whereby move- 'ment of any of the former from normal position, opens said switch and prevents starting of said electric motor under load. v

6. In a device of the class described, the combination with a plurality of Winches, of a plurality of driving means, one for each ofv said Winches, said driving means including a fluid pump and motor, an electric motor for actuating said pumps, a control circuit for said electric' switch when said pumps have been actuated to'- ineiective position.

7. In a device of the class described, the combination with a plurality of Winches, of a plurality of .driving means, one for each of said motor for operation.

pendent' control means has been previously -moved to operative position.

8. In a device of the class described, the combination with a plurality of driven members, of a plurality of driving means, one for each of said 'driven members, each of said means including a iiuid pump and motor, an electric motor for actuating said pumps, independent means 20 for conditioning each oi said pumps for operation, switch means for controlling the starting operation of said electric motor, and means actuated by said independent means for opening said switch means, thereby preventing starting g5 l of said electric motor under load.

9. In a device of the class described, the combination with a plurality of driven members, of a plurality of driving means, one for each of said driven members, each of` said driving means including a uid pump and motor, an electric motor for actuating said pumps, independent means for conditioning each of said pumps for operation, switch means for controlling the starting operation of said electric motor, means actuated by said independent means for opening said switch means, thereby preventing starting of said electric motor under load, and an interlock between two of said independent means for preventing simultaneous movement thereof.

10. In a boat and airplane handling device, the combination With a mast and a boom, of a plurality of Winches, one of said Winches being adapted to adjust the position of said boom, another of said Winches being adapted for handling airplanes, and still another of said Winches being adapted for handling boats, independent driving means for each of said Winches including a' iiuid pump and motor, an electric motor for simultaneously operating all of said, pumps, independent control means for adjusting the stroke and direction of discharge of each of said pumps, automatic means for rendering ineflectiverthe pumps associated With said boom and boat Winches,icontrol means for said automatic-means including a valve and a. fluid motor, cam means provided on said boom for opening said valve when said boom has been'operated a predetermined amount to condition said last mentioned 00 1l. In a boat and airplane handling device, comprising in combination a mast and a boom, a plurality of Winches, one of said Winches being adapted to actuate said boom, another of said Winches being adapted to handle airplanes, and still another of said Winches being adapted to handle boats, individual driving means for each of said Winches including a fluid 'pump and motor, an electric motor for driving said pumps, independent control means for adjusting the stroke and direction of discharge of each of said pumps, automatic means for rendering the pum'ps associated with said boom and boat Winches ineiective when the load imposed, upon the latter exceeds a. predetermined value,

said last mentioned means including a uid motor, valve means for controlling the operation of said uid motor, and means operated by the l e ditionsaid last mentioned motor for operation.

12. In a boat land airplane handling device, comprising in combination a mast and a boom, a plurality of Winches, one of said Winches being adapted to actuate said boom, another of said Winches being adapted for handling airplanes. and still another of said Winches being adapted to handle boats, independent driving means for each of said Winches including a fluid pump and motor, an electric motor for actuating said pumps, individual means for controlling the stroke and direction of discharge of each of said pumps, means associated With said last mentioned means for conditioning said electric motor for operation, and automatic means for rendering the pumps associated with said boom and boat Winches ineffective when the load imposed upon the latter exceeds a predetermined value, and means actuated by movement of said boom in one direction for conditioning said last mentioned means for operation.

13. In a boat and airplane handling device, comprising in combination a mast and a boom, a plurality of Winches', one of said Winches being adapted to actuate said boom, another of said Winches being adapted for handling airplanes, and still another of said Winches being adapted to. handle boats, independent driving means for each of said Winches including a uid pump and motor, an electric motor for actuating said pumps, individual means for controlling the stroke and direction of discharge of each of said pumps, an interlock disposed between two of said individual means for preventing simultaneous operation thereof, and automatic means for rendering the pumps associated with said boom and boat Winches ineective when the load imposed upon one of said Winches exceeds a predetermined value, said automatic means comprising a iluid'motor operatively connected to the pump associated with said boom Winch, and mechanical connections betweenv said motor and the pumps associated with said boom and boat Winches.

,14, In a device of the class described, the combination of a plurality of driven members, a. plurality'ofdriving means, one for each of said driven members, each of said driving means including a uid pump and motor, an electric motor for actuating said pumps, independent stroke adjusting means for said pumps, an operating lever for each of said last mentioned means, a switch for controlling the operation of said electric motor, operating means for said switch, and individual cam members operatively connected to each of said levers and in operative relation with said switch operating means where--l by movement of any of said levers causes said switch operating means to actuate said switch to open position thereby preventing starting of said electric motor under load.

15. In a device of the class described, the combination of a plurality of driven members, a plurality of driving means, one for each -of-said 5 driven members, each of said driving means including a iiuid pump and motor, an electric motor foractuating said pumps, independent stroke ad- I justing means for each of said pumps, an operating member for each of said last mentioned 10 means, a switch controlling the operation `of said electric motor, operating means for said switch including an extended projection, individual cam members having recesses therein for normally ,receiving said projections, means for maintain- 15 ing said projection in engagement With said recesses when said cam members are in normal position to normally retain said switch in closed position, and means operativelyconnecting said cam membersto said operating members, Where- 20 by movement of any one of said operating members from normal position before starting of said electric motor opens said switch and thereby prevents starting of said motor under load.

16. In a device of the class described, the com- 25 bination with a plurality of drivenmembers, of a plurality of driving means, one for each of said driven members, each of said driving means comprising a fluid pump and motor, power means for actuating said pumps, independent stroke ad- 30 justing means for each of said pumps,v an operating member for each of said last mentioned means, and automatic means for adjusting said stroke adjusting means toward neutral position when the load imposed upon the associated driven means exceeds a predetermined value, said'automatic means comprising a fluid motor operatively connected to one of said pumps.

17. In a device of the class described, the com'- bination with onevor more driven members, of

a uid pump and motor, stroke adjusting means for each of said pumps, an electric motor for actuating said pumps, independent means for conditioning each of said pumps for operation, said means comprising one or more rock shafts, one foreach of said pumps, anv operating member operatively connected to each of said shafts, and means for connecting said shafts to said i stroke adjusting means, a normally closed switch for controlling the operation of said electric. motor, operating means for said switch mounted on one of said shafts, said operating means including an anti-friction roller, cam members.l mounted on another of said shafts .each having a recess provided therein for normally receiving said roller, and means operatively connecting said cam members to said operating members whereby movement of vany one of said operating e members from normal position before starting of said electric motor opens said switch and thereby prevents starting of said motor under load.

ROBERT C. LAMOND.

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