| 摘要 |
A simple dock seal and guard having wear resistant, wear reducing and self-positioning characteristics for use around loading dock doorways. The dock seal comprises a pair of mounting brackets, a rocker arm assembly and multiple overlapping vertical sealing strips. The rocker arm assembly includes two arms, each having an inner end and an outer end, counterweight support means, horizontal counterweighting bars and a horizontal anchoring bar. The rocker arms are each rotatably attached to one of the mounting brackets generally in the center of the rocker arm. The rocker arms rotate, as a result of the attachment of the counterweighting bars, in a manner whereby the outer ends of the rocker arms are higher than the inner ends when said arms are at rest. The strips are fabricated of resilient, abrasion-resistant material and the free ends of some of said sealing strips have weights attached to them. When a docking vehicle is backed up to the loading dock, the sealing strips tend to wrap around the end of the vehicle forming a weather and conditioned-air seal while at the same time protecting the doorway structure. During the docking operation the outer ends of the rocker arms are pulled down by friction between the sealing strips and the docking vehicle. As a vehicle moves in and out of docking position and up and down during periods of unloading and loading, the sealing strips automatically track the movement of the vehicle. This tracking operation minimizes the tensile stress on the sealing strips and minimizes the relative movement between the strips and the vehicle.
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