| 摘要 |
A pipe jack including a sprocket head having radial projections, a hydraulic jack having a ram plunger at a top end and a base at a bottom end, a base plate and a roller chain sized to engage with the radial projections in various embodiments. In one embodiment, arc sprockets are provided in parallel on the sprocket head with each sprocket having a chord, connecting the arc ends, defining a flat surface across the arc sprocket. The chain engages with the arc sprockets and are adjacent and axially offset. The sprocket head having a support plate with a top and bottom surface, the top surface fixedly engaged with the arc sprockets. A receiving tube can be axially centered on and fixedly engaged with the support plate bottom surface. The pipe jack can be used to lift and position a half sole repair sleeve along a pipe to be repaired. |
