| 摘要 |
A safety device against rupture of a rotary shaft (1) for preventing the shaft from rotating and for preventing broken portions thereof from falling, the device being particularly suitable for use with a shaft that winds up lifting straps for a raisable curtain or that winds up the curtain itself, the device being characterized in that at least one safety element (3, 5) is placed to retain the shaft to prevent it from falling, and in that the peripheral surface of the shaft and the facing surface of said safety element are provided with means such as portions in relief (2, 6) that co-operate to prevent the shaft from rotating when a portion of the shaft is retained by said safety element due to the shaft rupturing. |
