发明名称 SAFE ANGLE GUIDE GAUGE FOR USE IN CLIMBING LADDERS
摘要 A device for determining if a ladder is at a safe angle comprises a casing having a face plate mounted therein. The face plate has an indicator pivotally connected thereto. The indicator has a central axle extending through the face plate, a counterweight affixed to an inner end of the axle behind the face plate and a pointer affixed to an outer end of the axle. The face plate has an outer surface tha t is provided with visible markings to which the pointer may point to indicate whether a ladder to which the device is attached is set at a safe angle.
申请公布号 CA2513243(A1) 申请公布日期 2007.02.08
申请号 CA20052513243 申请日期 2005.08.08
申请人 PARTRIDGE, CHARLES BERNARD 发明人 PARTRIDGE, CHARLES BERNARD
分类号 E06C7/00;G01B3/56;G01B5/24 主分类号 E06C7/00
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