FI123945B - The lift truck - Google Patents

Description

FIELD OF THE INVENTION

The invention relates to a drone hoist according to the preamble of claim 1. BACKGROUND OF THE INVENTION

Vans and trucks are commonly used for headlift lifts to facilitate loading and handling of the load 10. However, they have the disadvantage that they are heavy, rear-mounted structures that reduce the car's load-bearing capacity and impair the car's driving characteristics. In addition, the handling of heavy loads requires a pump trolley, which makes it difficult to efficiently utilize the load space. It is also difficult to find a place for heavy trucks in a fully loaded car during transport. Particularly in 15 vans, the load space and car load capacity are very limited.

GB-2202510A, US-4194867, US-5062760, US-5338147 disclose overhead crane-type cargo handling equipment replacing headlifts on the roof of a truck or van. However, the apparatuses shown are also extremely complex, heavy and impractical. The design height of the units is also remarkably large, which significantly reduces the load lifting height, especially in vans.

PURPOSE OF THE INVENTION

It is an object of the present invention to provide a new, more efficient load hoist that does not have the aforementioned drawbacks.

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The load lift according to the invention is characterized in what is set forth in the characterizing part of claim 1.

Since the load lift according to the invention is a telescopic boom, it is very simple and low in construction, allowing a high lifting height. With the telescopic boom crane according to the invention, the load area of the car can be very well and efficiently loaded. This allows the driver to load and unload the car independently, regardless of time or place.

An advantageous embodiment of the load hoist according to the invention is characterized in that the load suspension part, i.e. the carriage, has at least two gears which are at least partially pivotable with respect to each other so that the teeth of the gear wheels fit at each point of the toothed rack.

10 On the other hand, if the hoist carriage is moved manually without an electric motor, the rack can be used to lock the carriage in place. The locking device claw or the like is then locked in the gap between the teeth of the rack.

Most preferably, the telescopic boom of the load lifting device comprises at least two metal parts 15, which at least partially overlap each other, and within which there is a movable load securing member. Such a structure is simple and therefore inexpensive to manufacture. With the nested profiles, the structure of the load lifting device is compact and especially shallow. A low construction height does not unnecessarily reduce the free space of the load space. According to the invention, there are either ball bearings or plain bearings, such as bronze plain bearings, between the profile sections to reduce the friction caused by the telescopic movement.

Another advantageous embodiment of the load hoist according to the invention is characterized in that the telescopic boom of the load hoist comprises a screw, such as a ball screw or a £ 2 trapezoidal screw located inside or adjacent to the fixed boom part, and a nut attached to the movable boom part, - that the screw and the nut are connected so that by rotating the screw the movable part of the boom is movable relative to the fixed part of the boom.

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The structure according to the invention according to the screw-nut technique is precise and reliable in its function 00. Alternatively, some structures may also employ mechanical solutions based on a rack and pinion. This avoids the precarious cable solutions in prior art devices where breakage of the cable 35 can cause hazards.

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A third preferred embodiment of the load lift according to the invention is characterized in that a first electric motor is connected to the screw of the telescopic boom of the load lift to move the movable boom part relative to the fixed boom part. Most preferably, the low-current electric motor used in the load lift according to the invention is connected to the electrical system of the car.

A fourth preferred embodiment of the load hoist according to the invention is characterized in that the load hoist comprises a remote control device for controlling the operation of the first electric motor and / or the second electric motor, and that the remote control device is most preferably wireless.

The hoist or winch can also be remotely controlled. Advantageously, the functions of the hoist winch and the actuators may also be arranged to be voice or voice controlled, whereby both hands of the hoist operator remain free to handle the load.

A fifth preferred embodiment of the load lift according to the invention is characterized in that the load lift has fasteners for attaching a fixed part of the telescopic boom to the roof structures of the vehicle and / or support means for supporting the fixed part 20 of the telescopic boom to the car floor structures.

The compact load lift of the invention can easily be fitted and installed on either new or old vans. However, it is also suitable for other vehicles, trailers or stationary objects such as containers. The anchor points 25 in the roof structures can be fixed or movable, making it even easier to fit the load lift and install $ 2.

There may be two or more load lifters according to the invention in the vehicle, either $ 2 in the same direction or in different directions, so that the most suitable load lift can be selected depending on the load location and the lifting direction.

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Most preferably, a second electric motor is connected to the load suspension member for moving the suspension member o on adjacent rails of the telescopic booms by means of a gear.

° The movable load suspension part of the load hoist is preferably equipped with a hoist with a hoisting cable and 35 electric motors.

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The lifting device or winch of the lifting device may be any known lifting device which is connected to the load suspension part of the telescopic boom according to the invention. Preferably, the lifting device or winch is located within the telescopic boom, so that the lifting height achieved by the load lifting device is maximized. However, the lifting device 5 may also be implemented with a hoisting rope or a lifting strap, the lifting movement of which is provided by an electric motor or by a screw-nut mechanism attached to the load hanging part. Most preferably, the winch also has overload protection.

Various accessories or clamps 10 can be attached to the load lift according to the invention, which can easily and safely lift and move various pieces, barrels, pallets and the like.

Application examples

The invention will now be described, by way of example, with reference to the accompanying drawings, in which

LIST OF FIGURES

Figure 1 is a schematic side elevational view of a van fitted with a load lift according to the invention.

Figure 2 corresponds to Figure 1 and shows the load hoist in the second position.

Figure 3 is a schematic side view of a van fitted with another load lift according to the invention.

Fig. 4 corresponds to Fig. 3 and shows the load lift in another position.

“Figure 5 schematically shows a sectional view of the load lifter and support beams to be attached to the car's roof structures.

Fig. 6 is a schematic view of the load lifter and support beams of Fig. 5 connected to the roof structures of car i.

Fig. 7 is a schematic view of a fifth hoist according to the invention

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“Cross-section.

Fig. 8 is a schematic cross-sectional view of a load hoist according to a sixth embodiment.

Fig. 9 is a cross-sectional view of the load hoist of Fig. 8, seen from another direction.

Fig. 10 schematically shows the load lift of Fig. 8 positioned in a cargo space.

Fig. 11 schematically shows a cross-section of a load hoist according to the sixth invention.

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Fig. 12 is a side elevational view of the boom of the load lifting device.

Fig. 13 is a side view of the gear wheels moving the load carriage carriage. Figure 14 is a sectional view taken along line XIV-XIV of Figure 13.

Figure 15 is a schematic side view of a car fitted with a load lift according to another embodiment.

Figure 16 is a diagrammatic rear view of a car with a load lift.

Fig. 17 is a schematic cross-sectional view of a load hoist 10 according to the invention.

Figure 18 is a sectional view of a detail of a load hoist according to the invention. DESCRIPTION OF THE FIGURES

Fig. 1 shows a vehicle 10, which in this example is a van 10. A cargo lift 20 according to the invention is disposed at the top of the cargo compartment 11 of the vehicle 10 so that the telescopic boom portion 21 of the load lift 20 is longitudinally oriented. The load suspension portion 23 of the load lifter 20 and the lifting device 50 attached thereto are movable for lifting the unloaded load 24.

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2, the rear door 25 of the vehicle 10 is opened and the load 24 is raised from the floor 26 of the vehicle 10, after which the load 24 is moved out of the vehicle 10 and lowered to the ground 28. This operation is performed by moving the telescopic boom movable portion 22 of the load 21 in Figure 2 to the right.

At the same time, the load suspension part 23 is also moved to the right in the guide of the telescopic boom movable part 22 £ 2 in Figure 2. In the situation illustrated in Fig. 2, the load suspension portion 23 ° is at the very end of the movable portion 22 of the telescopic boom and the movable portion 22 is in its outermost position. In this case, the load 24 is lowered to the ground 28 as far from the vehicle 10 as possible.

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Fig. 3 shows a van 10 having a second cargo lift 20 according to the invention positioned at the top of the cargo compartment 11 so that the fixed portion 21 of the telescopic boom o of the cargo lift 20 is in the transverse direction of the van 10. The load hanging portion 23 of the load lift 20 is moved to the load 24 for lifting.

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4, the side door of the vehicle 10 is opened and the load 24 is lifted from the floor 26 of the vehicle 10, moved out to the side of the vehicle 10 and lowered to the ground 28. As shown in FIGURE 2, the movable portion 22 of the telescopic boom At the same time, the load suspension part 23 is moved to the right in the guide of the telescopic boom moving part 22 in Figure 4. In this figure too, the load suspension part 23 is at the very end of the movable part 22 of the telescopic boom and the movable part 22 of the telescopic boom is in its outermost position. The load 24 is then lowered to the ground 28 on the side of the vehicle 10 as far from the vehicle 10 as possible.

Fig. 5 shows a load hoist 20 with transverse support beams 44 attached thereto. The load hoist 20 is secured to the roof structures of the vehicle 10 by means of the support beams 44! 10 The fasteners 29 at the ends of the supporting beams 44 are then connected to the ceiling, for example, in connection with the fasteners of the roof rack. However, the support beams 44 may also be supported by the support posts 15a and 15b supported on the floor 26 of the luggage compartment of the vehicle 10 and the adjustable or fixed support members 16a and 16b as shown in Figure 10.

In the embodiment shown in Figure 5, the screw 34 for moving the telescopic boom moving portion 22 of the load lifting device 20 is located on the side of the telescopic boom fixed portion 21 and is rotated by an electric motor 36 via a toothed belt 45. In Figure 5, both parts 21 and 22 of the telescopic boom are partly cut for illustrative purposes so that the load suspension part 23 is also visible. In this embodiment, for the sake of simplicity, the load suspension member 23 is not connected to a transfer mechanism, but the suspension member 23 and the load to be attached thereto are moved laterally by hand.

In Figure 6, the load lifting device 20 is secured to the roof structures 27 of the vehicle 10 by means of brackets 46, support beams 44 and brackets 29. The structure of the load lift 20 is illustrated in more detail in Figure 7.

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Fig. 7 shows the load hoist 20, its brackets 46 and the carrier beam 44 to be attached to the roof structures 27 of the vehicle 10 i o The fixed portion 21 of the load hoist 20 i ^ telescopic boom is supported in place against the carrier beam 44 by 30 brackets 46. At the bottom of the fixed part 21 of the telescopic boom are slides 47 which act as sliding bearings between the support beams 21 and 22.

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The material of the slides 47 may, for example, be of red metal. Corresponding slides o 47 may also be connected to the end of the telescopic boom movable part 22 which is further inside the telescopic boom fixed part 21.

The load suspension section 23 of the load lifting device 20 is a carriage with rollers 33 which can move in the guides of the movable section 22 of the telescopic boom. The moving carriage has a lifting device 50, such as a winch, which lifts the load by means of an electric motor 41 and a lifting cable or lifting belt 51. Also, the movement of the carriage 23 within the telescopic boom can be arranged to occur by means of an electric motor.

Fig. 7 also shows a screw 34 for moving the telescopic boom moving part 22 disposed on the side of the telescopic boom fixed part 21. The screw 34 is rotated by an electric motor 36 via a toothed belt 45 and toothed wheels 48a and 48b. The nut part 38 corresponding to the screw 34 is fixed to the movable part 22 of the telescopic boom.

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The fixed part 21 and the movable part 22 of the telescopic boom of the load lifting device 20 are preferably made into sections by bending a sheet of steel. Similarly, a carriage 23 of the load suspension member 23 may be made. With lighter loads, it is also possible to use an aluminum profile in the manufacture of parts of the load lift 20.

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Fig. 8 shows a load hoist 20 whose outer telescopic boom part 21 is suspended on a transverse support beam 44 so that the load hoist 20 is movable laterally. In order to facilitate the transfer, the carrier portion 46 of the load hoist 20 has slides 52 supported on the carrier beam 44. Within the outer telescopic boom portion 21, there is an inner telescopic boom portion 22 which extends longitudinally and includes slides 47a and 47b. The carriage of the load suspension section 23 moves within the inner telescopic boom section 22 on the rollers 33.

It is essential for the load hoist 20 of the example shown in Fig. 8 that the carriage 2 of the inner telescopic boom part 22 and the load suspension part 23 is manually moved without the aid of electric motors or the like. This allows these transfer movements to be extremely fast and thus extremely lightweight and easy to use.

Naturally, in this case, the movable parts should be suitably light and well-supported, so that the user does not need to apply much force. In the example of Fig. 8, parts 21 and 22 of the telescopic boom x 30 are supported by slides 47a, 47b and 52.

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“Of course, the slides 47a, 47b and 52 can, however, be replaced by rotating bearings S, if necessary.

Since the load lift 20 of the example shown in Fig. 8 is manually operated, it is also provided with manually operated actuators. For this purpose, a vertical beam 55 having a transfer handle 53 and a brake handle 54. is attached to the carriage of the load suspension member 23. The user of the hoist 20 wants to move the carriage 23 of the load carrier inside the inner telescopic boom part 22 and then grabs the carriage 23. the carriage, he turns the brake handle 54, the operation of which is explained in more detail in the following figure. Also, the inner telescopic boom member 22 may have a separate handle for moving it within the outer telescopic boom member 21. According to the invention, however, the inner telescopic boom part 22 is conveniently moved so that the user locks the load suspension part 23 carriage relative to the inner telescopic boom part 22 by means of the brake handle 54 and then moves both the load suspension part 23 carriage and the inner telescopic boom part 22 simultaneously.

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Figure 9 is a cross-sectional side view of the load hoist 20 of Figure 8. Figure 9 clearly shows the slides 47a, 47b and 52 by means of which the telescopic boom portions 21 and 22 of the load lifting device 20 are connected to one another and the entire load lifting device 20 to the transverse support beam 44, respectively. The brake mechanism includes a vertical beam 55 having a crank mechanism 56 connected to the brake pad 57. When rotated from the brake crank 54, the crank mechanism 56 presses the brake pad 57 onto the inner telescopic boom member 22, locking these parts together.

Figure 9 also shows a wedge-shaped portion 58 connected to the inner telescopic boom member 22, which in the example of Figure 9 has two pieces on both sides of the telescopic boom at the carriage rollers 33 of the load suspension member 23. These wedge-shaped portions 58 allow for a slight transition point so that the carriage of the load suspension portion 23 is easily moved from the inner telescopic boom portion 22 to the outer telescopic boom portion 21 and back.

$ 2 Then the load lift 20 is easily accessible efficiently also manually, o

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Fig. 10 shows a support structure 40 disposed in the cargo space 11 of the vehicle 10 having support posts 15a and 15b supported on the floor 26 of the vehicle 10 and adjustable support members 16a and 16b. x 30 The horizontal portion of the support structure 40 is formed by a transverse support beam 44 to which the load hoist 20 is attached to the sliding bearings 52 illustrated in the preceding figures 00 so that the load hoist 20 is movable laterally. This provides the excellent advantage that the load lift 20 can be moved into the cargo space 11 of the vehicle 10 at an upper angle whenever it is not in use.

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Fig. 11 is a cross-sectional view of yet another load carrier 20 according to the invention which can be secured to the upper part of the vehicle 10 or some other cargo compartment 9. The fastening can be done either by means of support beams supported on the roof structures, on another part of the body or on the floor, as described in the previous embodiments. The fixed portion 21 of the telescopic boom of the load lifting device 20 is supported by a stationary member and includes an inner telescopic boom 22 which, if necessary, is moved by slides 47 to change the length of the boom 20 of the load lifting device. The inner telescopic boom 22 is also moved in this embodiment by means of an electric motor driven screw 34 located longitudinally inside the boom.

In Fig. 11, guides or rails 59 and 60 are connected to the lower edges of both telescopic booms 21 and 22, on which support rollers 33 of a carriage or load suspension member 23 moving in longitudinal direction are supported. The supporting surfaces of the rails 59 and 60 on which the rollers 33 rest are adjacent to each other at the same height so that together they form the supporting surface of the rollers 33. Hereby, the second edge of each roll 33 rests on the rail 59 of the fixed telescopic boom 21 and the opposite edge of the roll 33 rests on the rail 60 of the 15 movable telescopic booms 22. and the other rests on the rail 60 of the movable telescopic boom 22. Because the supporting surfaces of the rails 59 and 60 are in the same horizontal position, the carriage support rollers 33 are substantially supported on either the rail 59 of the fixed telescopic boom 21 or the rail 60 of the telescopic boom 22. Such a solution provides the load hoist 20 with a smooth guide for the rollers 33 of the load suspension section 23 over the entire length of the boom to be extended, the support surface of which does not have any discontinuity or threshold on the carrier rollers.

25 "In Fig. 11, the movement of the load suspension member 23 is within the telescopic booms 21 and 22

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arranged by means of toothed rails 61 and 62 and gears 63 and 64. A rack 61 is formed at the top of the rails 59 of the fixed telescopic boom 21 and a rack 62 is formed at the top of the rails 60 of the movable $ 5 telescopic boom 22. Both g rams 61 and 62 are at the same height. Similarly, the load suspension portion 23, i.e. the carriage, has gears 63 and 64 such that gear 63 cooperates with 00 gear rack 61 and gear 64 cooperates with gear rack 62.

When the electric motor connected to the load suspension part 23, not shown in Fig. 11, is rotated with the gear wheels 63 and 64 supported on the rack 61 and 62, the load suspension part 23 moves within the telescopic booms 21 and 22 of the load lifting device 20. When the telescopic booms 21 and 22 are nested, the gears 63 and 64 contact both toothed rails 61 and 62. with a rack 62. Either gear 63 or 64 and gear rack 61 or 62 cause movement of the suspension part 23 of the load 5, depending on whether the load suspension part 23 is inside the fixed telescopic boom 21 or at and within the movable telescopic boom 22.

Fig. 12 is a sectional view of a boom of a load hoist 20 showing a portion of the contents of a movable telescopic boom 22 with the contents of a fixed telescopic boom 21 within a longitudinally movable carriage, or load suspension member 23. the telescopic boom 22 on the rail 60 depending on where the boom carriage 23 is located. 12, the carrier rollers 33 of the carriage 23 rest on both rails 59 and 60, since these rails 15 are adjacent to one another in the area where the portion of the movable telescopic boom 22 is within the fixed telescopic boom 21. It is essential that the rollers 33 move flexibly and evenly on rails of the same horizontal plane from one rail to another without any discontinuity or threshold in height.

12, the gear rails 61 and 62 located adjacent to one another in the same horizontal plane also operate in such a manner that the gear 63 and gear 64 which move the carriage or load suspension member 23, not shown in FIG. 12, rest on either one or both racks 61 and 62. carriage 23 is.

Fig. 13 shows the gear wheels 63 and 64 of the hoist 23 moving the carriage 23 on the same axis and rotated by an electric motor not shown in the drawings. When the movable telescopic boom 22 is freely moved within the fixed $ 2 telescopic boom 21, when the boom 22 stops, the teeth of its toothed rack 62 x 30 may be at a different position than the teeth of the rigid telescopic boom 21 toothed rack 61. Therefore, a gear 65 is formed in the gears 63 and 64 which allows

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The gears 63 and 64 rotate relative to one another so much that the gear 63 o suitably engages the teeth of the rack 61 of the fixed telescopic boom 21, and the gear 64 correspondingly engages the teeth of the rack 62 of the telescopic boom 22. This synchronization of the gears 63 and 64 enables the flexible movement of the carriage 23 so that the gears 63 and 64 do not collide with the teeth of the rack 61 and 62.

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Fig. 14 is a sectional view of the gears 63 and 64, illustrating a spacing 65 allowing the gears 63 and 64 to be synchronized or rotated relative to one another.

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Fig. 15 is a side elevational view and partially sectional view of a van 10 having a cargo lift 20 according to the invention in the cargo compartment 11. The cargo lift 20 is supported on the floor 26 of the cargo compartment 11 by a support structure 40 including three support posts 15a, 15b and 15c support frame.

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Fig. 16 shows in more detail how the load hoist 20 shown in Fig. 15 is supported on the floor 26 of the cargo compartment 11. All three support frames supporting the load carrier 20 are formed by arches supported on the floor 26 of the luggage compartment 11 including the support columns 15a and 15b. 20 in this embodiment is secured by brackets 46 to bracket beam 44 in the center of car 10. The support columns 15a and 15b are made, for example, of an aluminum profile.

In the embodiment of Figure 17, the rollers 33 of the load suspension member 23, i.e. the carriage, are wider, which ensures that the rollers 33 remain on the rails. 17, the inner edges of the rollers 33 are supported by rails 59 of the telescopic boom fixed portion 21 in the load lifter 20. In the embodiment shown in Fig. 17, the telescopic boom moving portion 22 does not have a separate rail, the second periphery of the edges rest directly on the edge of the movable part 22 of the telescopic boom.

25 Both parts 21 and 22 of the telescopic boom have rack rods 61 and 62 to which are mounted the £ 2 load suspension member 23, i.e. the gear wheels 61 and 62.

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In the embodiment of Fig. 17, a trough 66 with a cable-carrying chain 67 is disposed within the telescopic boom of the load-lifting device 20. Power cables for electric motors and their control cables not shown in Fig. 17 may be placed in the tongue 66.

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Fig. 18 shows an alternative structure of a load suspension member 23, i.e. a carriage, moving within the telescopic boom of the load lifting device 20, with support rollers 33a and 33b being disposed on both sides of the lifting belt 51. Such a structure ensures that the load on the lifting belt 51 on the spool by rotating the electric motor 41 is uniformly supported on both sides thereof. The movement of the load suspension part 23, i.e. the carriage 12, is achieved by means of a gear 63 connected to the rack 61 and 62, which is rotated by a second electric motor 68.

ADDITIONAL COMMENTS

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It will be apparent to one skilled in the art that various embodiments of the invention may vary within the scope of the following claims. Thus, the load hoist 20 of the invention can be used in a variety of goods vehicles. However, it can also be used on freight trailers in both transportable and stationary containers. The telescopic boom of the load lifting device 20 may also be provided with one or more movable parts 22 in addition to the fixed part 21.

LIST OF REFERENCE NUMBERS

15 10 Vehicle 11 Cargo area 15 Support post 16 Support section 20 Load lift 20 21 Telescopic boom fixed part 22 Telescopic boom moving part 23 Load suspension '24 Load 25 Car door 25 26 Car floor c2 27 Car roof ° 28 Country g 29 Fastener i co 30 Roller x 30 31 Guide * 32 Guide cS 33 Roll

Tl- o 34 Screw g 36 Electric motor 35 38 Nut 40 Support structure 41 Electric motor 13 42 Bearing 43 Bearing 44 Carrier bar 45 Toothed belt 5 46 Carrier 47 Slide 48 Toothed pulley 50 Lifting device 51 Lifting cable or lifting belt 10 52 Sliding handle 53 Pull handle 55 Brake lever 54 Brake pad 58 Wedge part 59 Rail 60 Rail 61 Toothed rack 20 62 Toothed rack 63 Toothed wheel 64 Toothed wheel 65 Spacing 66 Trough 25 67 Chain co 68 Electric motor δ

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Claims (4)

1. A cargo lift (20) fixedly mounted in the cargo compartment (11) and intended for use in vehicles (10), such as in package cars, trucks or trailers, and in containers to be loaded on vehicles or which are stationary; in the upper part of the cargo space for moving cargo (24) when loading or unloading goods, and which cargo lift (20) is a horizontal telescopic boom with length that can be adjusted and to which it belongs a fixed telescopic boom part (21) and at least one movable telescopic boom part (22) which can be moved in relation to the fixed telescopic boom, and a part for hanging the load (23), ie. a carriage which can be moved within the telescopic boom with a length that can be adjusted by means of intermediate support means, such as rollers (33) or similar means, characterized in that there is a conductor in the load lift (20) adjacent to the fixed telescopic boom part (21). , such as a rail (59), and adjacent to the movable telescopic boom part (22) there is a conductor, such as a rail (60), which rails (59, 60) are on the same horizontal level such that the roller (33) the part for suspending the load (23), i.e. the carriage, may lean on the support surface of any of the rails (59, 60) and move from one rail or surface to another without a threshold or any discontinuity point when the part for suspension of the load, ie. the sled, moves inside the telescopic boom, adjacent to the fixed telescopic boom part (21) there is a rack (61) and in connection to the movable telescopic boom part (22) there is a rack (62), which rack (61, 62) lies on the same horizontal level such that the part for suspending the load (23), ie. the sled, can move inside the telescopic boom by means of the rack (61, 62) and at least one gear (63, 64) contained in the part for suspension. £ 25 2 Load lift (20) according to Claim 1, characterized in that the gear wheel (63, 64) or cm the gear wheels which are adjacent to the part for hanging the load (23), ie. The sled, in §, relies on both parallel rack (61, 62) or only on one rack depending on the location of the movable telescopic boom (22), ie. whether the movable x 30 telescopic boom part (22) is inside the fixed telescopic boom part (21) or at least partially cc pulled out of it. 00 CM Cargo lift (20) according to claim 1 or 2, characterized in that in the part for £ 3 suspension of the load (23), i. the sled, there are at least two such gears (63, 64) which are at least partially rotating in relation to each other such that the cogs in the gears fit into the gears of the gears (61, 62) at which point the hoists of the gears. 17 Load lift (20) according to claim 1, 2 or 3, characterized in that an electric motor (41) is connected to the load-hanging part (23) for moving the part for hanging on parallel rails (59, 60) belonging to both the fixed telescopic boom part (21) and the movable telescopic boom part (22) by means of at least one gear (63, 64) and the parallel gears (61, 62). CO δ CM i m o i CO X IX Q. CO CM tT O O δ CM