Existence of incompressible minimal surfaces and the topology of three - dimensional manifolds with
Existence of incompressible minimal surfaces and the topology of three - dimensional manifolds with
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DOI：
10.2307/1971247
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发表时间：
1979-07
期刊：
影响因子：
--
通讯作者：
R. Schoen;S. Yau
中科院分区：
文献类型：
--
作者：
R. Schoen;S. Yau
一种多用途手柄导向、手动推进的轮式车辆，特别适合于在崎岖不平的地形中安全除雪、负重和类似的节省劳动力的任务；在优选实施方案中，在平面视图中具有开放透镜状形状的框架在后端“T”型手柄和前端负载耳之间中央容纳车轮，雪刃、重扫帚和其他器具连接在其上；在每一端也在上表面上设有负载拾取站，该拾取站支持可拆卸的床或承载体，该床或承载体具有下垂端和向下突出的腿，该腿具有制动的、在休息时不倾斜的三点支撑。
A multi-purpose handle-directed, manually propelled wheeled vehicle particularly well adapted for safe snow removal, load carrying, and similar labor saving tasks in rough and uncertain terrain; in preferred embodiment a frame having open lenticular shape in plan view houses a wheel centrally between a "T" handle at the rear end and a load lug at the front end to which snow blade, heavy broomrake and other implements attach; at each end also on the upper surface a load pickup station is provided which supports a detachable bed or carrying body with drop-end and downwardly projecting legs providing, with the wheel, braked, non-tipping 3-point support when at rest.