Jib storing device of crane vehicle with jib

Abstract

The danger of the jib falling due to various operational errors is eliminated during both the operation of extending the jib from the stowed position thereof and the operation of stowing the jib from the extended position thereof. A jib (2) is respectively provided with a fulcrum pin engagement status detection means (5), a fulcrum pin disengagement restriction means (7), a connector pin engagement status detection means (6), a connector pin disengagement restriction means (8), a first correlation means (91), and a second correlation means (94), wherein movement of a connector pin (40) towardthe disengagement side is restricted by the connector pin disengagement restriction means (8) via the first correlation means (91) when the fulcrum pin engagement status detection means (5) detects that a fulcrum pin (30) has been disengaged, and movement of the fulcrum pin (30); toward the disengagement side is restricted by the fulcrum pin disengagement restriction means (7) via the second correlation means when the connector pin engagement status detection means (6) detects that the connector pin (40) has been disengaged, whereby both the fulcrum pin (30) and the connector pin (40) cannot be (simultaneously) disengaged during either the jib extension operation or jib stowing operation even when operational errors occur.

Description

technical field [0001] The invention of the present application relates to a lifter storage device of a lift truck with a lifter. Background technique [0002] In the lift locomotive with the lifter, the lifter is extended forward from the front end of the telescopic boom when the lifter is in use, and the lifter is stored in the front end of the telescopic boom when the lifter is not in use. The side of the base end boom. [0003] In addition, in such a lift truck with a lifter, the operation of extending and storing the lifter is performed as follows. [0004] First, in the lifter storage posture, the boss (with pin hole) at the front end of the front end boom is released from the boss (with pin hole) at the base end of the lifter, and the lifter is moved along the base end. The lateral posture of the end boom is supported by the first storage mechanism positioned on the front end side of the proximal boom and the second storage mechanism positioned on the proximal side ...

AI Technical Summary

Problems solved by technology

[0022] In the above-mentioned known example ( Figure 12 to Figure 15 ) in the lifter storage device, in order to move from the lifter 2 along the storage state of the base end boom 11 ( Figure 15 The state of (A)) makes this tappet 2 stretch out forward, at first as Figure 15 As shown in (B), after the upper and lower fulcrum pins 31, 32 are inserted into the upper and lower bosses 14a, 14b of the front end portion 13 of the boom, the upper and lower connecting pins 41, 42 of the first storage mechanism A part Disengage from the upper and lower bosses 27a, 27b on the tappet 2 side, but even if the upper and lower fulcrum pins 31, 32 are disengaged by mistake, the upper and lower connecting pins 41, 42 on the first storage mechanism A side will be disengaged (the hydraulic cylinder 45 shrinkage), also because the limiting member 81 is in the limiting position, the disengagement (extraction) of the upper and lower connecting pins 41, 42 cannot be carried out.

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