| 摘要 |
A ratio tape measure has a case (10), a ratio wheel unit (30), a decurling wheel (40), and a tape measure unit (50). The case (10) has a ratio shaft (16) and a decurling shaft (17). The ratio wheel unit (30) has a first perimeter wheel (31) mounted around the ratio shaft (16) and a second perimeter wheel (32) mounted around the ratio shaft (16). The decurling wheel (40) is rotatably mounted around the decurling shaft (17). The tape measure unit (50) is wound around the reeling unit (20) and has a first tape (51) and a second tape (52). When the first perimeter wheel (31) and the second perimeter wheel (32) rotate, the first tape (51) and the second tape (52) can be pulled out at a fixed ratio, and a user can measure two lengths at one time. |
