| 摘要 |
<p>A scrum machine (10) comprises pads (21) which are carried by a central frame portion (12) on which is mounted two pairs of ground engageable wheels (31, 32, 131, 132). The ground engageable wheels may be raised and lowered to adjust the extent to which the central frame rests on the ground. Additional resistance is offered by optional traction wheels (37, 38). Each traction wheel has its own brake (151).</p> |
