JPS63173184U - - Google Patents

Description

[Brief explanation of drawings]

Figures 1 to 13 show the basic embodiment of the present invention. Figure 1 shows the jib in the retracted state, Figure 2 shows the jib in the hanging state, Figure 3 shows the jib in the middle of twisting, and Figure 4 shows the jib in the completed twisting state. Side view shown, fifth
The figure is a front view of the state shown in Fig. 4, Fig. 6 is a front view of the state in which the jib is further pulled up vertically, Fig. 7 is a side view of the jib extended state, and Fig. 8 is a partially enlarged view of the state shown in Fig. 1. Fig. 9 is an enlarged perspective view of the same, Fig. 10 is an enlarged sectional view taken along the line AA of Fig. 8, Fig. 11 is an enlarged partial view of the state shown in Fig. 5, Fig. 12 is an enlarged view of each part of the state shown in Fig. 6, and Fig. 13 is 12 is a sectional view taken along the line B-B in FIG. 12, FIG. 14 is a view corresponding to FIG. 9 showing another embodiment of the present invention, FIG. 15 is a partially enlarged side sectional view showing yet another embodiment, and FIG. The figure is a partially enlarged side sectional view showing yet another embodiment.
Figure 17 is an enlarged sectional view taken along the line CC in Figure 16, and Figure 18
The drawings are sectional views taken along the line D-D in FIG. 17, FIG.
Fig. 21 is a side view of the conventional example in the jib extended state, Fig. 22 is a plan view of the same, Fig. 23 is a side view of the jib in the hanging state, and Fig. 24 is a side view showing the same jib in the retracted state. . 3...Telescopic boom, 31...Lower side jib mounting shaft when retracted, 4...Jib, 4a...Main girder that becomes lower side when retracted, 41
...Lower jib foot when stored, 42...Upper jib foot, 6...Lower jib foot mounting device, 61...Bracket of the same device, 62...Rod that can rotate and slide freely, x...Rod axis center (jib lower main shaft shifted downward relative to the girder), 63...the same crank member,
64, 44... Pin hole constituting a connecting means, 7... Connecting pin, 65... Thrust plate constituting a means for fixing the lower jib foot in a separated state during storage,
65a... Protruding piece of the thrust plate, 66... The stopper, 9... Fixed pin mechanism constituting another example of the same means, 92... Pin of the same mechanism, 62a... The same pin hole,
68, 69...Same pin hole.

Claims (1)

[Scope of utility model registration request] The jib is equipped with a telescoping boom and a compression column type jib that extends from the tip of the boom. Jib mounting shafts are provided on both the left and right sides of the jib, while jib feet that can be attached to and detached from the jib mounting shafts are provided at the base ends of the main girders on both sides of the jib. The jib foot located on the lower side can freely rotate around an axis that is shifted downward from the main girder when the jib is stored, and can rotate on the same axis as the main girder. A means for attaching the jib foot to the base end of the main spar so as to be slidable toward and away from the base end of the main spar, and removably connecting the jib foot to the base end of the main spar in the close state, and A crane jib extension comprising means for fixing side jib feet in a separated state;
storage device.