| 摘要 |
A roller device for a ladder-top, which provides roller-facilitated ease in moving the ladder-top along a wall to change the ladder's inclination. The roller device is characterized by its support factors which provide great ease of its attachment to existing ladders, by using the top rung or step of the ladder as one of the supports; and, providing particular advantage for extension ladders, the overall length of the roller device is limited to provide that when used on the inner section of an extension ladder, the roller device will freely pass by the extension-limiting stop-lug of the outer section, thus permitting full removal of the inner ladder-section from the outer ladder-section in spite of the purposely-blocking presence of that stop-lug, without removal or any change of the roller device.
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