| 摘要 |
What is disclosed is a combined pair of ladders and transportation dolly device. The device includes a first framework having a first and a second end and a second framework having a first and a second extremity. The first extremity of the second framework is pivotally secured to the first end of the first framework about a first pivotal axis. A loading platform is provided for supporting a load. The platform has a first and a second edge. The platform is pivotally secured to the second end of the first framework about a second pivotal axis, the second axis being disposed between the first and the second edges of the platform. A tie bar has a first and second termination with the first termination being pivotally secured to the second edge of the platform about a third pivotal axis. The second termination of the platform is pivotally secured to the second framework about a fourth pivotal axis. The fourth pivotal axis is disposed between the first and the second extremities of the second framework. A wheel is rotatably secured to the platform. The arrangement is such that in a first mode of operating the device, when the first and second frameworks are pivoted away from each other, the frameworks constitute a pair of ladders. However, in a second mode of operating the device, when the first and second frameworks are pivoted towards each other, the wheel permits transportation of the device together with the load supported on the platform.
|
