Patent ID: 7451783

Claim:
A spacer inserted in a gap between an existing pipe and a rehabilitating pipe to adjust the position of the rehabilitating pipe with respect to the existing pipe, comprising: a first wedge-shaped member having a surface inclined at a prescribed angle; a second wedge-shaped member having a surface inclined at an angle the same as the inclination angle of the first wedge-shaped member, the inclined surface of the second wedge-shaped member being aligned with and overlapping the inclined surface of the first wedge-shaped member; and latching means for making the second wedge-shaped member movable toward the first wedge-shaped member in an insertion direction and for latching the members to each other at any of a plurality of latch positions to avoid movement of the members in a reverse direction opposite the insertion direction; wherein the second wedge-shaped member is successively movable to one of the latch positions to stepwise increase an overall height of the spacer; the inclined surface of one of the wedge-shaped members includes a linear groove, and the inclined surface of the other wedge-shaped member includes a linear protrusion that slidably engages with said groove in an inclined-line direction to enable movement of the second wedge-shaped member in the insertion direction relative to the first wedge-shaped member; and the first and second wedge-shaped members include teeth formed in said linear groove or in said linear protrusion.