| 摘要 |
<p>A truck for tow line use is provided with an improved brake system designed to stop the truck in response to engagement of a front bumper of the truck against an obstacle, while minimizing the force applied by the truck and bumper to the obstacle. The truck includes at least one brake member having a bottom floor-engageable surface and an upper wheel-engageable surface, with brake support means on the truck which supports the brake member in front of at least one of the wheels for relative movement between a retracted position ahead of the wheel and a braking position in which the brake member is engaged beneath the wheel. The brake support means includes a relatively light longitudinally movable brake support member, and the front bumper is movably mounted thereon rather than directly on the truck itself. Control means responsive to engagement of the front bumper with an obstacle stops the forward movement of only the brake and its support member. Thus the wheel runs onto the brake member with a resulting cessation of forward motion due to the action of the brake member and weight of the truck, rather than the resistance of the obstacle. An anti-back-up device prevents premature rearward movement of the wheel and truck from the brake member. The truck also includes means for releasing the anti-back-up device.</p> |
