Formulas have been derived for determining the folding location, the folding Angle and the driving surface Angle.

导出了设计折面轮叶折转点及折转角的计算公式，以及合理确定驱动面倾角的理论计算公式。

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This article is mainly discuss folding Angle, crease line, body-board's height of auto-bend tray-type carton, which supplies mathematic model for the development of carton package CAD.

本文讨论了盘式自动折叠纸盒的折叠角及体板高度等数学问题，为该类包装纸盒CAD开发建立了有效的数学模型。

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Plated frame, high backrest, adjustable backrest Angle, after bending handrails, lift foot care, solid front, pneumatic rear wheel plastic wheel frame, folding handle support.

电镀车架，高靠背，可调靠背角度，后折弯扶手，升降脚托，实心前轮，塑料轮框充气后轮，可折支撑把手。

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