| 摘要 |
A portable ladder has two stiles interconnected by rungs. The ladder is provided with a stand off device, including two stand off arm assemblies, each being telescopically inserted into a receiving space. Each stand off arm assembly has a base part and a stand off arm interconnected by a hinge that allows the stand off arm to be pivoted between a position in alignment with the base part and an angled stand off position. The stand off arm assemblies are each configured such that—in extended position—the hinge is located outside the receiving space with the base part being located within said receiving space, and also such that—in retracted position—the base part, the hinge, as well as at least a portion of the stand off arm are located within the receiving space. |
| 主权项 |
1. A portable ladder having two elongated stiles interconnected by ladder rungs, wherein the ladder is provided in its upper end region with a stand off device, said stand off device comprising two stand off arm assemblies, each stand off arm assembly being telescopically inserted into a receiving space associated with the respective stile of the ladder, so as to be telescopically movable relative to the stile,
wherein each stand off arm assembly has a base part and a stand off arm, said base part and stand off arm being interconnected by a hinge that allows the stand off arm to be pivoted between a position in alignment with the base part and an angled stand off position, wherein the stand off arm assemblies are each configured such that, in extended position of the stand off arm assembly, the hinge is located outside the receiving space associated with the respective stile of the ladder with the base part being located within said receiving space, wherein the stand off arm assemblies are configured such that, in retracted position of the stand off arm assembly, the base part, the hinge, as well as at least a portion of the stand off arm are located within the receiving space associated with the respective stile of the ladder, wherein the hinge is embodied such that, with the stand off arm in extended position and the stand off arm aligned with the base part, the stand off arm is unstable, when the ladder is held vertically, so that the stand-off arm will tilt to its angled position automatically, wherein a hinge lock mechanism automatically locks the hinge when the stand off arm reaches its angled stand off position, and wherein the hinge lock mechanism includes a user operable actuator to effect release of the hinge lock. |
