| 摘要 |
A pump jack pole assembly includes a rigid elongated tubular member having a planar front wall surface, an elongated elastomeric strip having a flat rear surface disposed adjacent the tubular member front wall surface and a front surface having grooves therein extending lengthwise of the strip, a retainer plate in each of the grooves, each of the plates having a thickness less than the depth said grooves so that the front surfaces of the plates are recessed in the strip front surface, and screws for releasably fixing the plates in the grooves and the elastomeric strip to the tubular member front wall, the heads of the screws being recessed in the plates.
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