DE2251596A1 - WINCH FOR HEAVY LOADS - Google Patents

Description

Dipl.-Ing. Heinz Bardehle

Patent attorney β MBncbeB 22, Hernistr. 15. Tel. 29255S

Postal address Munich U, PO Box 4

Munich, March 20th, 1972

My Seichen: P 1519

Applicant;

USM Corporation
Flemington / Mew Jersey
Delivery address: Balch Street

Beverly, Mass. Ol 915

United States

Heavy duty winch

In the industry, heavy load winches are widely used for movement and positioning to effect various loads. The overhead winch category includes those below the two tonne class lie, the most common. They usually use a motor that has a reduction gear, not a planetary gear is, drives wheels that retract or retract a cable, and also usually have one or more complicated braking mechanisms to ensure that in the event of an interruption of the kinetic energy, be it intended, if it is caused by an error, the position of the load is reliably maintained. While most Winches generally work satisfactorily, yet they are often of great weight and impractical in size. The very large overall height required by them and the lack of maneuverability and their complexity let go

309817/0295

much to be desired in this regard.

Since in the known winches one end of the diaper cable is attached to the motor housing, while the other outside of the Center is coupled to the torque applying member, there is an undesirable tendency that viinde and cables get out of equilibrium during operation.

The object of the invention is therefore to create a compact power drive that is uncomplicated and essentially symmetrical is constructed in which the disadvantages mentioned are avoided and which is permanent when an influence is exerted on a load maintains a dynamic balance.

In addition, the construction for a winch is intended for large Loads are specified that are more transportable and easy to handle. The desired wind should be "Such an act with electric drive, in the case of mechanisms to reduce speed in great proportion, be they of the planetary type, be they of any other type, due to their mechanical inertia, they have a great resistance to backdriving forces and thus automatically serve as a load brake.

According to the invention, this object is achieved by a power drive, which is shown below as a winch, solved by a drive motor having coaxial drive shafts a pair of counter-rotating cable winch drums coaxially disposed over the motor and drive shafts are, by a cable connectable to a load, which is attached at its ends to the drums and by a Gearbox (preferably by a gearbox of the wave motion type, as in US Pat. No. 2,959,665 or US Pat. No. 2,9 <± 3,513, published on November 3rd, 196o or on July 5th, 196o, by the same applicant is described), and which acts as an automatic brake and an operative connection between a drive shaft and the drum next to it.

3098 17/0295 ORDINAL INSPECTED

A conventional electric drive motor is preferably used, the drive shafts of which are driven by a pair of conventional wave motion planetary drive units or by a pair of gear units not belonging to the planetary gears in their speed be reduced. This process is caused by the drive of the respective wave motion generator. Latter may have an elliptical shape for undulation generation, as will be shown below, or more than two Have elevations and of different types of construction as they have been used in wave motion generators so far. The wave of radial deflections in each The unit is set in the circumferential direction by a unit that is not rotating itself or is rotating relatively slowly passed double row perforation, which is hereinafter referred to as flexible perforation and the outside a row has relatively coarse serrations extending in the axial direction and a number of finer teeth, i.e. in the circumferential direction distributed teeth of smaller circular pitch. One of these rows of flexible teeth works with one rigid teeth together, which is secured against relative rotation with respect to a frame, the other row of Tooth § & ämmt at points spaced apart from one another in the circumferential direction with a rigid circular toothing, which is a larger Number of internal serrations (the differential is small and a multiple of the number of curves in the wave generator) and which is attached to the adjacent cable winch drum. About a counter-rotating movement of the other To achieve drum / is on the other hand a double flexible toothing, similar to the one just described, in axial Shifted direction, i.e. the coarse teeth that are on the outside of one unit are on the reduction unit for the other drum located inside. The arrangement is such that a row is finer and a row is relatively coarse Teeth of the flexible teeth are held against a relative rotational movement, and that the / drive of the motor the drums at the same time in the opposite direction with the same or almost the same reduced variable rotational speed of motion

3 nights over 17/0? 95

moved to let out or retract the cable carrying the load, the ends of which are connected to the drums. The cable extends from diametrically opposite sides of the drums at equal distances from a center point between the two drums through openings in a cylindrical one Housing through to the outside. The middle part of the cable iat Shaped into a loop and through a washer or something similar passed through.

To limit the actuation movement of the cable and thus to the A novel mechanism controlled by the rotation of the drum is provided to protect the winch.

The above-mentioned and other features of the invention, together with various improvements in details of construction and combinations of individual parts, will now be considered in connection described in more detail with an exemplary embodiment with reference to figures.

Fig. 1 shows the perspective view of a drive with its control unit, which is designed as a winch.

Fig. 2 shows the top view from one side of the winch according to Figure 1.

FIG. 3 shows a view from below of part of the winch shown in FIGS. 1 and 2.

Fig. 4 shows a longitudinal section of the winch.

FIG. 5 shows a section along the line V-V in FIG.

Fig. 6 shows the perspective view of an arrangement of serrations, the one winch drum and the Frame is assigned.

Fig. 7 shows a view similar to Fig. 6, but illustrating the serrations that the other winch drum and is associated with the frame.

3098 17/02 95

Pig. 8 shows a section along the line VIII - VIII in FIG. 4, showing the control mechanism for limiting the Illustrates cable movement.

FIG. 9 shows a section along the line IX-IX in FIG 4th

Fig.Io shows an exploded perspective view View of individual parts shown in FIGS. 4, 8 and 9.

Mainly in Figures 1 to 4 is a drive for controlled Movement and / or positioning of loads in the form of an overhanging winch shown as a whole is denoted by Io. It comprises an electric motor 12 (FIG 4), with coaxial axle shafts 14, 14, of a pair of combined Load holding and speed reduction mechanisms 16, 16 able to drive in both movements. The latter mechanisms are, as will be described, coupled to coaxial cable winding drums 18, 18, which surround the motor, its shafts and the reduction elements 16. Around the centered and isolated relative coaxial position of the motor 12 with respect to the drums 18, a hollow frame 2o (Figures 4 and 5) has a cylindrical Plain bearing 22, which is preferably made of electrically insulating polymeric material, which has a low coefficient of friction such as polytetrafluoroethylene or something like that, and on which the drums turn. A pair of circlips 26, 26 serrated on the periphery sit in Grooves within the hollow frame 2o and hold plates 27, 27 in the axial direction. The latter v / iron corresponding coaxial Bores that with the peripheral areas 28, 28 of bearings 29 are in attack, which sit on the axle shafts 14 concerned. Each of the plates 27 has axial projections 25 (FIG. 4), which bear against axially extending lugs 23 of the motor 12 in order to prevent it from relative movement to hold onto the frame 2o.

309817/0

To seal the winch mechanism against the ingress of dirt and other undesirable parts, a composite one is used Housing provided, which consists of cylindrical shells 3o, the adjoining parts of a central circular band or belt 32 (Figures 1 to 3) are overlapped. Appropriate elements, such as a pair of retaining screws 34 (one of which is shown in Figure 1) extend through the belt 32 and into the cups 3o in to hold them together releasably. To the winch in more appropriate To keep it in the working position is a securing hook 36 in the radial direction in the middle part of the frame 2o inserted and secured with the help of a castle nut 38 and a split pin. The belt 32 can be on its one Side have an opening for receiving a supply cable 39 (Figure 2) is used and connects the motor 12 to a suitable power source. It can also be another have an opening for receiving an electrical control cable 4o (FIGS. 1 and 2), which leads to a push-button control unit leads, which is designated by 42 (Figure 1).

If the term "winch rope" is used here, this is it to be understood in the broadest sense and includes everything that can be wound up, elongated force-transmitting element, under which to to name only examples, cables, wires, chains etc. are to be understood, be they made of metal or other material. If chains are used, the corresponding lifting devices can be chain wheels corresponding to the drums.

The individual turns of the entirety of the winch cable 44 lie in the spiral groove 46 (FIG. 4), which in the surface of the Drums 13 is shaped. The axially outer ends of the winch rope or winch cable 44 are in a suitable manner, such as attached to the drum by means of a bracket 47 (Figure 4). When the drums 18 are simultaneously in opposite directions Direction are moved by the still to be explained reduction mechanism 16, run the inner and unwound Parts of the cable 44 from the drums down and

'"309817/0295

Sad or / g _whale

form a loop by means of a suitable connecting element. This connecting element can be, for example, a pulley or another bottle suction element such as a Act block 48 (Figures 1, 2 and 3), which has an arcuate groove and a safety hook 49 tregen to which the load to be lifted can be attached. Every of the cover shells 30,30 has an opening 5O (FIGS. 1 and 3) extending in the axial direction through which through the winch cable is picked up during the levering process.

Referring now to FIGS. 4-6, FIG Construction of one of the reduction mechanisms, exemplified by the / US patent 2,943,913. It goes without saying that it is the other reduction mechanism preferably and usually around one of the same structure which, as shown in Figure 7, ends in the axial direction is shifted towards the end, but not in the opposite direction. The underside of the frame, which is partly a coarse and, on the other hand, a fine double toothing, contributes to the creation of a counter-rotating Rotational movement of the drums and in this way ensures the same predetermined ratio of speed reduction between the movement of the Motojrß 12 and that of the drums 18. A vibration generator shown by way of example has an elliptical thumb disk 52 (Figures 4-7), which is rotatably mounted on the shaft 14 and in this case a double row of rolling elements to reduce friction in the form of balls 54 which are arranged on running surfaces which run along the periphery of the heart disc. The balls 54 reach outwards to a flexible ring-shaped toothed ring 56, which has two rows of spline teeth on the outside and this a corresponding elliptical shape. One row 58 of the teeth has a relatively coarse pitch, the other

BATH 309817/0295

has a larger number of teeth and a finer pitch. As shown in Figures 5 and 6, the fine ones stand Teeth 60 of the flexible ring gear in the area of the larger axis at one end of the wind with the serrated teeth 62 in the Engagement formed in the outer part of the frame 20. The axial dimensions of the teeth 62 on the frame 20 are expediently used to secure the plates 27 against a relative rotational movement. At opposite As FIG. 7 shows, ends of the winch grip the coarser teeth 58 of the other reduction mechanism 16 in the areas of the larger axis on the teeth 62, which are located there in the outer wall of the frame.

In this way, the coarser, flexible teeth 58 of a reduction mechanism 16 (FIG. 6) mesh in the area of the larger axes with the larger number of circular serrations 68 (the differential in this case is a multiple of 2), which are integrally connected to the adjacent drum 18, whereas the other reduction mechanism 16 (FIG. 1), the coarser teeth 58 mesh in a corresponding manner with the serrated teeth 62 on the frame and onto them act. One of the drums 18 (Figure 6) is in one direction by the relatively coarser flexible teeth 58 in Rotational movement offset and the other drum 18 (Figure 1) is moved in the opposite direction by the relatively finer teeth 60 .

Accordingly, it is found that as a result of the generation of the circumferential wave radial deflections and of the differential between the teeth 60 and 62, the teeth 56 at a greatly reduced speed compared to that the drive shaft 14 is set in rotary motion, and that due to the further differential between the flexible Teeth 58 and serrations 68 on the drum, the latter moves at an even further reduced exit speed will. An outer snap ring 69 (4) sits in one in the

BATH ORIGINAL

^f "^{; r} ' ^: 3098 17/02 9 B

ι; , - ■■ ^: .. ■;. -. ■■■. ■■■ - ■■■ ν; : ι :

Drum located groove and holds the ring gear 56 in ! axial direction fixed.

■ As a special embodiment of a reduction hiechanism with double reduction, which both what the teeth; differential as well as the number of serrations,

\ is not to be understood as a restriction, a scfcner \ with a reduction ratio of 100 to 1 is described. \ In this case, a flexible perforation with teeth 200 meshing with a toothing on the frame 2o with 202 teeth and

a perforation of 220 teeth the same flexible Zahnanord- \ voltage having a perforation of 222 teeth which is integrally formed on the drum 18th The comb at the other end of the drive

220 teeth of the flexible teeth mesh with the 202 teeth on the frame / with the 2OO teeth of the flexible teeth 222 teeth of the adjacent drum. '

As indicated above, the innej run located parts of the cable 44 away from the drums or on opposite sides of the same in the figure 2 and 3 shown Art./^ at the same time their tightening or Sfachgebebewege control, the push-button control unit 42 preferably an element 7O for actuating a Opposite to sight on> with which the speed

'Motor 12 is regulated, as well as a two-pole switch 72, with the help of which the direction of rotation of the motor is determined. With the finger of one hand, an operator can control the load attached to block 48 and, as shown in FIG. 3, this can rotate progressively about its axis during operation. *

The mechanism for counting and monitoring the rotary movement which will be described below is designed in such a way that that it automatically sets the upper and lower limits, that is, the inner and outer limits of the actuation movement of the cable 44 is determined. Like Figures 4, 8, Ö

j 309817/02 95 original

and show Io is one of the drums 13 on its inside End provided with an axially extending pin 74. This pin 74 is arranged so that it moves with each revolution of the drum a Maltese cross 76 (Figures 4, 9 and 10) by 90% turns. This Maltese cross is rotatably mounted on a pin 78 which is in a limit switch unit designated SO is stored. This unit has a base 82, which by means of screws 84 on the inside of the frame 20 is attached. The Maltese cross 45 eccentrically carries an axially extending extension 86, the rests against a shoulder 38 of a wheel 90 and takes it along in the direction of rotation. Approach 88 in turn engages a shoulder 92 of a wheel 94, which is also mounted on the pin 78, and takes it with it. A fourth wheel 96 mounted on pin 78 has an attachment 98 on which attachment 92 engages in the circumferential direction. Approach 96 is the element for operating the switch. The arrangement is made so that when a desired Limitation of the rotary movement of the drum in one direction, the attachment 98 actuates a spring-loaded microswitch lO2, in order to interrupt the power supply to the motor 12, and that in the event of a limitation of the desired rotational movement in the other direction, this extension 98 actuates a similar switch 104 in order to switch off the motor 12. In order to the cable 44 is never completely wound onto or unwound from the drums 18.

It will be recognized that other suitable equivalent means of limiting the rotation of the drum may be provided can. Bs can also be provided, although not it is shown that second switch-controlled limiting elements be brought into operative connection with the other drum in order to act as a preventive fuse which ensures that that in the event of an overload or a defect in one of the reduction units 16, the motor drive of the Drumming is interrupted without the wind being subjected to impact stress exposed i

309817/0295 «* ·« ■ »" · ««>

The mode of operation of the winch will now be briefly discussed. if a load is attached to the hook 49, the speed of rotation of the motor 12 and thus that of the drums 18 is reduced determines the degree to which the element 7o is pressed in to actuate the sliding resistor, the lifting or the slackening the load is determined by the direction of actuation of switch 72. A slide of this switch will usually result in an upward movement of the load

the
b en. / counter-current rotational movement of the drums 18 has the consequence that the free or unwound parts of the cable 44 are moved at the same time and raise or lower the load. When the suspended load is lifted, the block 48 will pivot from its position shown in broken lines in Figure 3 to the position shown in full lines, with the direction of the resulting force exerted by the load still being essentially through the center of the winch Io runs so that no unstable condition occurs. It is easy for an operator to control the winch so that the load is precisely placed as desired *.

While reduction mechanisms 16 are of the double type or of the type of dynamic serration are preferably used to achieve a large ratio speed reduction at a Achieve compact winch for large forces au, ·. is on it to point out that there is also a reduction in the form of a piano gear can be used if necessary within the scope of the invention. It could be an idler gear in one of the c: picyclic gear parts are inserted to counter-rotating movement to effect. An excellent advantage in any case is the fact that if the engine is interrupted, be it intentional or somehow caused by a disturbance, a high resistance to reverse rotation is maintained. The force exerted by the load on the cable 44 is therefore incapable without the Driving force of the motor lead to a lowering of the load, which is due to uen influence of the drum, which the There is a tendency for the wave motion generator to move backwards

3098 17/0295 öaö

BATH ORIGINAL

309817/0295

to drive. In other words, this means that the j. ineffectiveness of the reduction mechanisms 16 to the emergence of a
large braking force or load holding force, which makes each position

the load is automatically maintained even when the propulsion.

lack of strength. \

It should be noted that the described double reduced start f

drove in an advantageous manner to a counter-rotating movement of the

Drumming leads without additional elements such as a j

planetary gear would be required in a gear part and

this drive is accordingly interchangeable. t

Drums that rotate in the opposite direction are turned into the j

Winding as described above, usually 1

preferred, since in this case there is a dynamic equilibrium

and a compact structure. However, let it be

pointed out that for some types of applications a drive

a single drum and a single reduction mechanism,;

which cooperates with a single motor shaft, advantageous f

may be that such a drive is still in the ■

The scope of the invention lies. This is how the main.:

Execution of an anchor winch drive the engine speed i

reduced by means of a transmission that has a: backward movement;

opposed a high resistance and with the drum

is coupled, and in which the frame, which is in the circumferential direction

is arranged between the drum and the motor, safe,

represents that the latter is set in a rotary motion when

when acting on the cable as a support for the '

Drum is used. For this purpose, either a reduction (

mechanism with a double reduction ratio or a re- '■

dynamic serration type induction mechanism. γ

Claims (19)

Expectations 1. power drive, characterized by a motor (12) with a drive shaft (14), by a coaxially to the drive shaft (14) running winch drum (18), by a frame (2o), the bearings for the drum (IS) and is arranged in the circumferential direction between the drive shaft (14) and the winch drum (18), by means of mechanisms (16) for speed reduction which are in operative connection with the drive shaft and set the drum in rotary motion around its axis, and thereby, that the motor (12) and part of the reduction mechanisms (16) rest on the frame (2o), and that these reduction mechanisms have a high resistance to reverse drive. 2. Power drive according to claim 1, characterized by an electric motor (12) having a pair of axially spaced apart Has shafts (14), through reduction gears (16), each of which is in operative connection with one of the shafts (14) stand and drive elements (56) which are rotatable in opposite directions, by a pair of coaxial rotatable winch drums (18) that drive the motor (12) and surround the gear (16) in the circumferential direction And thereby, that the frame (2o) arranged in the circumferential direction between the shafts (14) and the drums (18) acts as the active surface for the gear (16) and as a storage area for the drums (18) is used, the drive elements (56) of the transmission are in operative connection with the drums (18). 3. Electromechanical power drive according to claim 2, characterized characterized in that the motor (12) can perform a rotary movement in both directions of movement, that on the drums (18) in each case one cable end is attached and is wound onto this by at least one turn that the middle part of the cable for connection to a moving or 309817/0295 is equipped to be lifted load, and that each has a reduction gear (16) establishes an operative connection between each of the drive shafts (14) and one of the winch drums (18), so that this is simultaneous in the opposite sense with appropriate same speed can be moved due to the cable (44) of which acts on the load. 4. Power drive according to claim 3, characterized in that the transmission is in the form of two wave motion mechanisms (16) each arranged to provide the rotary motion driving force take one of the shafts (14) and each of a reverse rotational movement has a high resistance oppose when the motor (12) is put out of operation, so that the cable (44) the load in the respective Able to hold. 5. winch, characterized by a pair of adjacent coaxial, in opposite directions «= rotatable winch drums (18), by a cable (44), of which parts spaced apart from one another are wound onto the drums (18), by a Motor (12) with coaxial drive shafts (14), through speed reduction mechanisms OtG) # which are arranged within the drums (18) and which a ^ synchronize with the retraction of the cable, to stop the cable or to output the same if the between the spaced Coiled cable parts located cable part is connected to a load, and by a frame (2o) between the motor (12) and the drums (18) is arranged to secure the motor against relative rotational movement and in order to form a storage area for the drums at the same time. 6. Winch according to claim 5, characterized in that it is a pair of reduction mechanisms (16) with double transmission ratio in the form of shaft motion drives which have an operative connection between each drive shaft (14) and a drum (18) produce, and that a gear 309817/0295 BATH ORIGINAL (56) each of these mechanisms (16) meshes with teeth (62, 68) molded into the frame (2o). 7. Winch according to claim 5, characterized in that the motor (12) an electric motor that controls are provided to adjust the extent of the working movement of the central part of the cable to which a limit switch (8o) to interrupt the electrical connection line between motor (12) and energy source and one from the frame (2o) carried mechanism belongs to that with one of the drums (18) is in operative connection (74) to actuate the limit switch (8o) when the middle of the cable reaches a predetermined distance from one of the drums (18) Has. . ": · · 8. Winch according to claim 6, characterized in that the reduction mechanisms (16), which establish an operative connection between the drive shafts and the relevant drums, each comprise a wave motion generator (52) coupled to one of the drive shafts (14), as well a double flexible toothing (56) with two rows of axially extending differential serrations (58, 6o) to which in In the circumferential direction, a wave movement of radial deflections is exercised by the wave motion generator (52) that the one row of teeth (58, 6o) of the one double serration (56) at points spaced apart from one another in the circumferential direction with the KerbzMhnen (62) of the frame (2a) / and that the corresponding one row of teeth (58, 6o) of the other flexible double teeth on in the circumferential direction meshes from spaced-apart locations with serrations (68) located on the adjacent drum (18) . 9. Winch according to claim 8, characterized in that the frame (2o) is arranged and designed so that it has bearing surfaces for the drums (18) rotating in the opposite direction. · 309817/0295 10. Winch, characterized by a fixed hollow frame (2o), by an electric motor (12), which is fixed in the frame (2o) so that it cannot rotate, and a pair of drive shafts (14), which extend coaxially into this, by a pair of winch drums (1Γ) which are coaxial and in the opposite direction around the axes of the drive shafts (14) are rotatably arranged around and supported by bearings (22) carried by the frame (2o) a cable (44) which can be connected to a load and is wound onto the two drums (13) through speed reduction gears (16) by the drive shafts (14) are driven, one of which (56) with the adjacent drum (18) is in driving operative connection and the other (56) meshes with teeth (62) located on the outer surface of the frame (2o). 11. Winch according to claim lo, characterized in that each gear unit (16) is of the double reduction type, and a flexible toothing (56) with two rows of axially spaced teeth (58, 6o) through which one circumferential shaft of radial deflections to the teeth (68) of the drum (18) and to the teeth (62) of the Frame (2o) is transmitted out. 12. Winch according to claim 11, characterized in that each gear unit (16) has two rows of flexible teeth (58, 6o), the number of teeth is different, and that the teeth with the same number of teeth in the one unit on the outside of the winch are ue with to be able to comb the adjacent drum (18) and lie on the inside of the other gear unit in order to be able to rest on the frame (2o) so that the drums (18) are rotated in the opposite direction. 13. Winch according to claim 11, characterized in that the Drums (13) each with a row of teeth (68) on the inside 309817/0295 BAO ORiGfMAL are provided, which are in different places with the flexible Teeth (56) käimtien and which has essentially the same diameter as the teeth (62) of the frame (2o). 14. Winch according to claim lo, characterized in that the The middle part of the cable (44) forms a loop through an element (43), since it can be connected to the load, and that elements (36) are attached to the frame (2o) to anchor the winch (lo), so that in this way from Cable (44) during operation of the winch (lo) raised element (48) an angular movement about a vertical axis can perform, which runs essentially through the center of the winch. 15. Winch according to claim lo, characterized in that the bearings for the drums are in the form of a cylindrical sleeve (22) and are made of a synthetic polymeric material with a low coefficient of friction. 16. Winch according to claim lo, characterized in that at least one of the drums (18) is in operative connection with a mechanism (76) for counting the rotational movement, and that a limit switch (8o) attached to the frame (2o) can be actuated by this counting mechanism to reduce the Put the motor (12) out of operation when the number of turns of the cable (44) is on either one of the drums almost zero or when one of the drums is almost fully wound. 17. Winch, characterized by ein.Rahmen (2o), in the circumferential direction a bearing surface (22) forms and inside with two rows of serrated teeth distributed in the circumferential direction (62) each located at opposite ends of the frame (2o) is provided by a pair of coaxial Cable winch drums (18) mounted on the bearing surface (22) by a motor (12) driving each other has opposing drive shafts (14) and the 303817/0295 ÄAD ORiG _mal is secured against a rotating rotational movement in relation to the frame (2o) and whose drive shafts (14) run coaxially to the teeth (62) of the frame, by two rows of serrated teeth (68) distributed in the circumferential direction, which are
are located inside the drums (18) and are spaced axially from an adjacent one of the two rows of serration teeth (62) of the frame (2o) by a pair of flexible double teeth (56), each of which has circumferential rows of teeth (58 , 6o) which mesh with the teeth (68) of the drum or * those (62) of the frame at spaced locations, the differentials of the number of teeth in the
outer meshing rows of teeth (58, 6o) are unequal, and by a wave motion generator (52) which is connected to the respective drive shafts (14) and which is used to generate a counter-rotating movement of the drums (18)
Contribution of the flexible teeth (56) is used and the
opposes a high resistance to a reverse drive, due to which the position of the load is maintained in the event of an interruption of the motor rotation. 18. Double drum winch, characterized by a mechanism which causes the drums (18) to rotate in the opposite direction, by a motor (12) running inside the drums (18) is arranged and has two drive shafts (14), by a frame (2o), which the Mctor (12) against a
Relative rotational movement is held and by two gears (16), which each establish a connection between a drive shaft (14) and a drum (18) and which have a gear (56) which is arranged so that it is on a part of the frame (2o ) attacks and that os a reverse drive caused by the load to be wound up of the drum (18), with which the gear wheel (56) is in operative connection, opposes a great resistance. 19. Double-drum winch according to claim 18, characterized in that the gear train (16) are interchangeable. 3 09817/0295 _9AD Blank page