Extension and retraction system for boom apparatus
    2.
    发明授权
    Extension and retraction system for boom apparatus 失效
    吊臂装置的伸缩系统

    公开(公告)号:US4575976A

    公开(公告)日:1986-03-18

    申请号:US507349

    申请日:1983-06-24

    IPC分类号: B66F11/04 E04H12/34

    CPC分类号: B66F11/046

    摘要: An extension and retraction system for a multiple section, telescoping boom apparatus of the type utilized for raising and lowering a work platform or basket. The innermost longitudinally movable section is carried by a longitudinally inextensible or base section, and is extensible and retractable relative to the base section by a dual cylinder assembly. Extension chains trained about sprockets carried by certain of the sections automatically extend the other extensible sections upon extension by the cylinder assembly of the innermost longitudinally movable section. Automatic and positive retraction of such sections is accomplished by retraction chains operating in response to retraction of the innermost section. The cylinders of the dual cylinder assembly are pivotally coupled at a pivot mount longitudinally slidable along a guideway carried by the base section to thereby accommodate deflections of the boom sections located between the opposite extremities of the dual cylinder assembly. A feature of the apparatus is use of slide pads disposed between the boom sections to transmit loads, the pads being configured to accomplish this with minimum wear.

    摘要翻译: 一种用于升高和降低工作平台或篮子的类型的多段伸缩臂装置的延伸和缩回系统。 最内纵向移动部分由纵向不可伸展或基部承载,并且通过双缸组件相对于基部可伸缩。 由某些部分承载的链轮训练的延伸链在由最内纵向可移动部分的气缸组件延伸时自动延伸其他可延伸部分。 这些部分的自动和正向收缩通过响应于最内部分的缩回而工作的缩回链来实现。 双缸组件的气缸可枢转地联接在可沿着由基部承载的导轨上纵向滑动的枢转安装座,从而适应位于双气缸组件的相对两端之间的悬臂部分的偏转。 该装置的一个特征是使用设置在起重臂部分之间的滑动板来传递载荷,该垫被配置为以最小的磨损来实现。