| 摘要 |
A control joint device for creating control joints in concrete and other setting materials is disclosed including a reciprocating means, a surface breaking member and a ridge member having a generally flat bottom surface except for a first ridge along, at least, a portion of its length, wherein, in use, the first ridge of the ridge member is positioned behind the surface breaking member, the surface breaking member is mechanically reciprocatable between a first position and a second position, the first position being substantially level with the first ridge of the ridge member and the second position being spaced apart from the first position. |
