| 摘要 |
A ledger system for scaffolding which comprises a tubular ledger member having an end plate at one or both ends and being provided at one or both ends with a first slot extending from the end plate parallel with the axis of the tubular ledger member and a second slot also extending from the end plate parallel with the axis of the tubular ledger member and located 180 DEG round the circumference of the tubular ledger member from the first slot, the second slot having an enlarged inner end; and a wedge member for each pair of slots being arranged to pass through the first and second slots but being prevented from being removed from the first slot by first and second retaining means located adjacent the broader and narrower ends respectively of the wedge, the width of the enlarged inner end of the second slot being such as to permit the narrower end of the wedge with the second retaining means to pass freely therethrough. Such a ledger system can be used with a standard which has one or more hook members located around its circumference, the tubular ledger member being hooked onto a hook member by means of the first and second slots through which the member passes and the wedge member being tapped into place between the hook member and the inner ends of the first and second slots. Such a system affords quick and safe single-handed erection and prevents the ledger falling off the hook even if the wedge member is not engaged. |
