| 摘要 |
The improved water drain pipe test plug device includes an elastomeric solid drain plug which is resilient and flexible and is in the form of a disc. The disc has a front surface and an opposite parallel rear surface connected thereto by a peripheral annular rim. The disc has a leading end and a trailing end, the rim at the leading end sloping rearward and inwardly and the rim at the trailing end being parallel thereto. An arcuate spacing plate is connected to the disc front surface and a pressure plate is connected to the disc's rear surface. The pressure plate, in turn, is connected to a generally laterally extending elongated lever arm having a slot extending up therethrough. A pivot arm is rotatably connected to and depends below the lever arm, terminating in a bottom foot which is adapted to support the device on the lower edge of a drain pipe access hole. A lock arm bearing at least one and preferably two notches in its upper surface is rotatably secured to the pivot arm and is spring biased toward the notch. Engagement of the single notch in the slot against the lever arm fully locks the disc into a position which completely plugs the drain pipe. Where a second notch is present, when it is engaged the disc is moved to a position where the trailing end thereof is spaced away from the adjacent wall of the drain pipe to permit slow drainage of the pipe.
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