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Triangle instrument which is provided with aluminium-chromium alloy step slot corner pointer and is adjustable in the same plane

InactiveCN105280058AAvoid line of sight errorGlide smoothly and easilyEducational modelsAluminiumEngineering
The invention relates to a special triangle instrument for the teaching field, and specifically relates to a triangle instrument which is provided with an aluminium-chromium alloy step slot corner pointer and is adjustable in the same plane. As the improvement, an upper contour of a rotary disk is provided with an arched convex beam; an upper plane of an edge scale is provided with a step convex trail; a transition convex bar is arranged between the step convex trail and the upper plane of the edge scale, and is centrosymmetric; a step groove is formed in a lower plane of a sliding plate; a transition groove is arranged between the step groove and the lower plane of the sliding plate, and is centrosymmetric; ball base step holes are formed in the lower plane of the sliding plate, and are symmetrically arranged at two sides of the transition groove; the outer protruding sphere of the outer side surface of a sliding ball base on an outer half piece of the sliding ball base on the sliding ball touches the upper plane of the edge scale sliding plate; the step groove on each movable plate is slidingly coordinated with the step convex trail on the adjacent movable plate; and specifically on the upper plane corner scales of the edge scale are corresponding to a corner pointer on the back of the lower plane of the sliding plate on the location so that the rotation angle between the rotary disk part and the scale plate part can be controlled conveniently and visually.
Owner:陈俞任
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