| 摘要 |
<p>SPRING FEED DEVICE A feed control device for use in conjunction with both hand held and wheel mounted plumbing tools of the type used for cleaning and removing obstructions from drain pipes in which an elongated coiled spring wire, or plumber's snake, is advanced through the pipe and rotated. The feed control device includes a novel snake feeding mechanism movable into and out of engagement with the snake and includes a biasing means for yieldably urging helically grooved feed rollers, which form a part of the feeding mechanism, into driving engagement with the snake. With this arrangement the device can readily accomodate distortions and irregularities in the snake without damaging either the snake or the plumber's tool. The helically grooved rollers which drivably engage the snake are uniquely constructed with double or triple lead threads, or grooves, which cause the snake to be fed at a significantly increased rate of speed than is possible with conventional feeding devices. Adjustment means are Provided to regulate the force exerted by the biasing means on the feed rollers to enable ready adjustment of the feeding mechanism and to accomodate for wear.</p> |
