FI91229C - Lifting platform - Google Patents

Description

91229

LEVEL OF CRANE

The invention relates to a platform crane, in particular to a transport vehicle having guides for guiding the lifting plane vertically, a traction member arranged to act on the lifting plane to raise the lifting plane vertically by a 5 sec articulated link

Usually in such platform lifts, the lifting wire is attached to the lifting carriage, whereby when moving the device inside the vehicle 10, the lifting platform must first be folded into the manually folded transport position. The lifting platform is placed in the transport position by turning the lifting platform 90 °, whereby the articulated linkage attached to the lifting platform causes the lifting platform to move inside the vehicle. Lifting the cover-15 must be carried out carefully, as the complex articulated linkage would otherwise easily fail. Accidents also often occur at work when fingers fall between the lever arms.

In the solution according to the invention, the above-mentioned placing of the device 20 in the folded transport position takes place entirely by the action of a hydraulic cylinder connected to the device. The platform does not need to be touched at all when the machine is in use, but the function is only controlled by the buttons on the hydraulic cylinder. The invention is characterized in that a stop is formed in the vertical guides of the level crane so that when the vertical movement of the carriage moving in the guide stops at the stop, the traction member is guided to the vertical position of the lifting platform by means of the articulated linkage.

The invention will now be described with reference to the accompanying drawing, in which

Figure 1 shows a level crane mounted on a vehicle,

Figure 2 shows the level crane in the open, horizontal position, the figure shows the folding of the myfis device in broken lines,

Figure 3 shows the level crane in the folded position.

As shown in Fig. 1, the platform crane passes the two guides 1 and 5 of the lifting platform to guide the lifting platform 6 vertically. The guides 1 are supported and attached to the vehicle, inside the vehicle, near the outlet. The guides 1 are further supported at the top of the vehicle by a transverse beam 3. In connection with the first guide 1, behind a protective plate 2 10, a hydraulic cylinder is mounted, to which a traction member 5, such as a lifting cable, is connected. The traction member 5 is arranged to pass inside the guides 1 through folding wheels placed at the sides 3 '/ 3' 'of the beam 3 of the beam 3. According to the invention, the traction member 5 is attached at one end to a hinge link 10 between the guides of the plane section-15 Tur and the lifting platform.

The guide 1 is made of a hollow steel profile, preferably in the shape of a square, with a narrow notch-shaped opening extending in the longitudinal direction of the guide 20 to the side of the square facing the lifting plane 6.

A carriage-like member 4 is arranged inside the guides 1. As shown in Figures 2 and 3 in more detail, the carriage-like member 4 is in this case provided with four pulleys 7 which rest and slide inside the guide against the wall facing the vehicle 1 of the guide. In this case, the body part of the carriage-like member 4 is formed by a T-profile beam, the flanges of which rest on the wall of the guide in which said notch is formed. The articulated linkage 10, in turn, is fastened to the member 4 using fastening flanges. The mounting flanges protrude from the carriage-like member 4 and pass through a notch formed in the guide. A stop 35 is arranged on the path of movement of the sled-like member 4, inside the guide 1, so that the upward movement of the sled-like member 4 is prevented when the lifting platform 6 is at a certain distance, for example 1-91229 10 cm, above the vehicle transport plane.

As shown in Fig. 2, the articulated lever 10 is arranged to operate so that when the lifting platform 6 is turned 90 ° upwards, the articulated lever 6 moves from the outside 5 of the lifting platform 6 completely inside it into a narrow package, whereby the vehicle doors can be closed. The articulated linkage 10 has an articulated-parallel structure and encounters a vertical arm 11, the lower level of which has a pivoting lifting level 6. The arm 11, in turn, is attached to the sled-like member 4 by casting the first and second lever arms 12, 13. The second lever arm 13 is articulated on the one hand to the arm 11 and on the other hand to the sled-like member 4. The first lever arm 12 is arranged at a suitable distance from the end of the arm 11 to the center of the arm and articulated on the one hand a pivot rod 14 articulated to the first lever arm 12 and the lifting plane 6. The pivot rod is positioned adjacent the arm 11 parallel to the arm. During lifting, the pivot rod 14 moves 20 towards the arm 11 and in the folded outer position is located next to the arm 11. The movement of the articulation thus takes place in substantially the same vertical plane at all times. Correspondingly, the trajectory traveled by point 6 of each lifting platform is located in a vertical plane.

The movement of the platform crane from the open outer position to the folded outer position and on the other hand the movement of the lifting platform 6 from the substantially horizontal outer position to the vertically inverted outer position is effected by a hydraulic cylinder which is driven by the drive member.

The traction member 5 thus provides both the movement of the carriage-like member 4 and the movement of the articulated linkage 10 at the final stage of the lifting-moving movement, when the carriage-like member 4 contacts the stop in the guide 1.

According to the invention, the traction member 5 is guided outside the guide 1 via folding pulleys placed at the ends 35 of the beam 3 and a carriage-like member 4 arranged in the guide 1 and fixed to the articulation link 10 and not to the lifting carriage 4 as in the known solution. In this case, the traction member 5 can move in its longitudinal direction with respect to said sled-like member 4. In the exemplary case, the traction member 5 is guided to pass between the two folding wheels forming the folding gear 8 attached to the sled-like member 4, so that the folding gear 8 causes a change in the direction of the traction member 5 towards the articulation lever 10. The purpose of the folding hydrant 8 is thus e.g. increase friction.

In the exemplary case, the traction member 5 is attached to the arm 11, preferably to the lower part of the arm. In principle, the traction member can be attached to any part of the articulated linkage or even to the lifting platform 6. The articulated linkage 10 is dimensioned and the attachment point of the traction member 5 is selected so that the lifting platform 6 -20 position. The trajectory traveled by point 6 of each lifting platform is located in a vertical plane.

When operating the platform crane from the folded Series position to the lift position, the mechanical safety catch is first released to ensure that the machine remains in the folded position during transport. After TamSn, by pressing the lower button on the hydraulic cylinder, the lifting platform of the platform crane lowers to the horizontal lifting position. When the lifting platform is flush with the floor of the vehicle, the lower button is released and the double-folded lifting platform is usually opened and the load is unloaded from the vehicle onto the lifting platform. Pressing the lower button lowers the lifting platform from the lifting platform after unloading.

The folding of the platform crane is, of course, carried out by anti-pressure measures. From the lift button, press -35 to first raise the lift platform to the floor level of the vehicle.

5 91229 The hinged extension of the lifting platform is then covered twice on the lifting platform. By pressing the lift button again, the lifting platform automatically moves to the vertical transport position when the mechanical locking device 5 locks the device in the folded out position. After this, it is still a good idea to ensure that the device stays in place by pushing the lifting platform down slightly on the transport supports attached to the floor of the vehicle.

Claims (2)

6 A platform crane, in particular for transport vehicles, wherein the platform crane has a movable lifting platform (6) in the vertical guides (1) which can be tilted from a horizontal lifting position to a vertical position during transport, the platform crane comprising an articulated linkage (10) moving the lifting platform (6) when the lifting plane is rotated in the longitudinal direction from the horizontal lifting position to the vertical position, the platform crane comprises a traction member (5) such as a hoisting cable connected to the articulated linkage (10) to raise the lifting platform (6). so that when the vertical movement of the carriage (4) moving in the guide stops at the stop, the traction member (5) rotates the articulated linkage (10) to the vertical position of the lifting platform (6). Level crane according to Claim 1, characterized in that the articulated linkage (10) consists of at least one parallelogram, the first side of which is connected to a carriage (4) movable in the guide (1) and the second side or a lever parallel thereto. 7 91229