Patent ID: 7971536

Claim:
A carriage conveyance device comprising a conveyance carriage which is supported so as to travel on guide rails laid on a floor surface and is provided with an object support base movable vertically, elevating cam follower rollers which move vertically in conjunction with a vertical movement of the object support base, an automatic lock means which locks the object support base being raised at a rising limit position, and unlocking cam follower rollers for unlocking the automatic lock means, and laid on a conveyance carriage traveling path side are elevating cam rails which push up the elevating cam follower rollers and unlocking cam rails which switch the unlocking cam follower rollers to unlocking positions, wherein the unlocking cam follower rollers are disposed higher than a conveyance carriage supporting level of the guide rails, the elevating cam follower rollers project further downward than the conveyance carriage supporting level when the object support base is at a lowering limit position, and positioned higher than the conveyance carriage supporting level when the object support base is at a rising limit position, and in an aisle crossing area crossing an aisle in a conveyance carriage traveling path, a crossing aisle floor member is laid at the same level as the conveyance carriage supporting level, and in front and rear of this crossing aisle floor member, slope floor members are provided for filling a level difference between the floor surface and the conveyance carriage supporting level, and in this aisle crossing area, elevating cam rails which push up the object support base to the rising limit position are laid on an upstream side of the aisle crossing area so that the conveyance carriage can pass through the area in a state that the object support base is locked at the rising limit position by the automatic lock means.