Jib stowing device for jib crane vehicle

A jib stowing device for a jib crane vehicle, comprising a jib removably attachable to a distal portion of a top boom of a telescopic boom mounted on a vehicle body, a common pivot pin retractably insertable into a top boom boss provided on a side portion of the distal portion of the top boom and a first jib boss provided on a side portion of a proximal portion of the jib when the bosses are aligned with each other so that the jib can be rotated about the pivot pin in a space on one side of the telescopic boom, with the telescopic boom being in a fully contracted state, between an extended position in which the jib is extended to the front of the distal portion of the top boom and a stowage position in which the jib is located along one side of a base boom of the telescopic boom, and stowing means provided between the base boom and the jib for stowing the jib on a lateral side of the base boom,

• wherein the stowing means has a base boom boss provided on the lateral side of the base boom, a second jib boss provided on a lateral side of the jib, and a coupling pin removably insertable into the base boom boss and the second jib boss,
• wherein the jib is provided with pivot pin insertion state detecting means for mechanically detecting whether or not the pivot pin is in an inserted position, pivot pin retraction restricting means for mechanically restricting movement of the pivot pin to a retracted side, coupling pin insertion state detecting means for mechanically detecting whether or not the coupling pin is in an inserted position, coupling pin retraction restricting means for mechanically restricting movement of the coupling pin to a retracted side, first associating means for mechanically associating the pivot pin insertion state detecting means and the coupling pin retraction restricting means, and second associating means for mechanically associating the coupling pin insertion state detecting means and the pivot pin retraction restricting means,
• wherein movement of the coupling pin to the retracted side is restricted by the coupling pin retraction restricting means via the first associating means when the pivot pin insertion state detecting means has detected a retracted state of the pivot pin, and the restriction of movement of the coupling pin to the retracted side by the coupling pin retraction restricting means via the first associating means is released when the pivot pin insertion state detecting means has detected an inserted state of the pivot pin,
• wherein movement of the pivot pin to the retracted side is restricted by the pivot pin retraction restricting means via the second associating means when the coupling pin insertion state detecting means has detected a retracted state of the coupling pin, and the restriction of movement of the pivot pin to the retracted side by the pivot pin retraction restricting means via the second associating means is released when the coupling pin insertion state detecting means has detected an inserted state of the coupling pin,
• wherein the coupling pin of the stowing means is provided on the base boom, and the coupling pin insertion state detecting means on the jib is removably engageable with the coupling pin, and
• wherein the coupling pin insertion state detecting means is engaged with the coupling pin when the jib is stowed on one side of the base boom so that the coupling pin insertion state detecting means can detect whether or not the coupling pin is inserted into the base boom boss and the second jib boss.