| 摘要 |
PCT No. PCT/GB83/00041 Sec. 371 Date Oct. 12, 1983 Sec. 102(e) Date Oct. 12, 1983 PCT Filed Feb. 11, 1983 PCT Pub. No. WO83/02797 PCT Pub. Date Aug. 18, 1983.A ladder safety device is provided which may be fitted to a ladder and includes at least two elongated members cooperating telescopically. Apertures are formed in the elongated members which may be brought into register on telescopic extensions of the members to receive the ends of ladder uprights so that the device may be located transversely across the top of a ladder. The apertures may be of different sizes and may be brought into register at different relative locations of the elongated members to receive ladder uprights at different separations. In a preferred embodiment, the device comprises a central and two additional elongated members. The central member is formed with two spaced apertures and each additional member is formed with one aperture towards one end thereof. |
