SE448971B - CRANE - Google Patents

Description

448 971 The mutual contact surfaces between the shoulders are preferably designed as self-holding wedge surfaces.

The folding joint in the crane according to the invention is supported in four surfaces both in the operating position and in the transport position, whereby it withstands external loads, because the joint stresses are symmetrical and the stresses decrease compared with the known solutions. The external dimensions of the joint are smaller and the column as a whole is lighter, whereby in addition to material savings, more advantageous production and easier use are also achieved.

The invention is described in more detail in the following with reference to the accompanying drawing.

Figure 1 shows from the right a crane with an articulated boom in operating position.

Figure 2 shows an advance before the crane is folded to the final transport position.

Figure 3 shows the crane in the final transport position.

Figure 4 shows the joint of the pillar on a larger scale from the right side, i.e. from the operating side, and locked in the operating position. Figure 5 shows the same joint from the left side.

Figure 6 shows the pillar joint locked in the transport position.

Figure 7 shows the same from the other side.

Figure 8 shows a section through the hinge shaft, when the hinge is locked in the operating position.

The exemplary embodiment of the crane according to the invention shown in the drawing comprises a foot 1, a lifting boom 2, a sliding boom 3 and its extension 4, a gripper 5, a lifting cylinder 6, a sliding cylinder 7 and a two-part pillar, the upper part of which is designated 8. and lower part 9.

The articulation mechanism between the lifting cylinder 6 and the column, to which mechanism the invention relates is generally indicated by * reference number 10.

When the crane is folded from the operating position according to Figure 1 to the transport position according to Figure 3, where dimension B indicates the permitted transport width and dimension H permitted transport height, the position according to Figure 2 is an intermediate stage, where the lifting cylinder 6 must overcome the torque caused by the weight of the bars 2, 3, 4. When the crane is in this position, the joint 10 is released from the locked operating position, after which the lifting cylinder 6 tilts the upper part 8 of the column around a joint 13 to the transport position, where the joint 10 is locked again. During the movement, the weight of the booms rests on a slope support 12 and the upper link 11 of the column 11. The construction and function of the weight 10 described in the following with reference to Figures 4-8.

The lifting cylinder 6 pivots relative to the lower column 9 of the pillar on a hinge 14 and a hollow shaft 15, figure 8. Within the hollow shaft 15 runs a groove axis 16, which is connected at one end to a locking arm 18 provided with a handle 17 and at its other end via a groove sleeve 19 to a locking arm 20. The arms 18 and 20 thus move together. The arms 18 and 20 are provided with a shoulder 21 and 22, respectively, which when the crane is in a position according to Figures 1, 2, 4, 5 and 8 abut against shoulders 23, 24 formed on the upper part 8 of the pillar and in the position of the crane according to Figures 3, 6 and 7 abut against shoulders 25 and 26 also formed on the upper part of the column.

The mutual contact surfaces between the shoulders are preferably designed as self-holding wedge surfaces, which hold the joint together. A continuous locking without clearance can be achieved e.g. by means of springs 27 and 28. Compared with the known joint solutions, the advantage is also achieved in this way that the wear in the joint ___-_ .. _- - ~ ..._.._._ _..__._ .. _.._ .. r. 448 Wl reduces the clearance of the joint, in contrast to the wear in the known conductors increases the clearance and causes extra service costs. When the crane is in the operating position, the load can be further secured e.g. gvnom soluble stoppers 30 montcrade in t.cx. guides 29.

The counter shoulders 25 and 26 of the transport stand are advantageously dimensioned so that the shoulders 21 and 22 of the pivot arms 18 and 20 strike them when the upper part 8 of the pillar leans towards the transport position, i.e. the counter shoulders 25 and 26 also act as stops for the tilting movement.

Claims (3)

......__.._... -_ .. ... ...._..__..._..._...._.... 448 971 ggtentansgràk. A lifting crane comprising a foot (1), a two-part articulated pillar (8,9) mounted thereon, a lifting boom (2) connected to the upper part (8) of the pillar, a lifting cylinder (6), which is hingedly connected at one end to the lifting boom (2) and at its other end to the lower part (9) of the column, and means for locking the upper part (8) of the lifting cylinder (6) in the operating position of the crane and characterized therefrom, that the locks relative to the pillar transport position comprise two pivot arms (18,20) connected to each other via the pivot shaft (15) of the lifting cylinder (6), each of which is provided with a shoulder (21,22) against the upper part (8) of the pillar, and in shaped upper shoulders (23,25,24,26) for the upper part (8) of the column for the operating position and the transport position, respectively. 2. A crane according to claim 1, characterized in that the mutual contact surfaces between the shoulders (21,22) of the pivot arms (18,20) and the counter shoulders (23,25,24,26) of the column (8) are designed as self-holding wedge surfaces. 3. A crane according to claim 1 or 2, characterized in that in order to ensure continuous freedom from clearance in the reading, the pivot arms (18,20) are provided with half springs.