| 摘要 |
<p>The frame positions a trailer or trolley on the ground, using a double roller support to allow movement in any direction. The frame has hooks which can be altered to suit the trailer being carried. The frame can be tipped to a vertical position using hand grips (9,10) which are movable to allow passage of the trailer through a limited height area. The double rollers (7,8) of one set allow movement in horizontal and vertical directions with the aid of second (9,10) vertically moving and third (11,12) horizontally moving sets.</p> |
