JPS62141701U - - Google Patents

Description

[Brief explanation of the drawing]

Figure 1 is a front view of a curvature measuring instrument showing an embodiment of the present invention, Figure 2 is an explanatory diagram of the operation when measuring a surface to be measured using the curvature measuring instrument of Figure 1, and Figures 3 and 3 are B is an explanatory diagram of the principle of the curvature measuring device of this example. 1... Center arm, 1a... Contact point, 1b
...Stopper part, 2...Side arm, 2a...
...Fitting groove, 2b...Base, 2c...Support part, 2d
...Tip, 2e...Contact point, 3...Scale, 4...
...Pointer, O...Concave curved surface, T...Convex curved surface, A...Vertical distance between the contact point 2e and the contact point 1a, X...The midpoint of the vertical line connecting the pair of contact points 2e and the contact point 1a horizontal distance. R...Radius of curvature of the surface to be measured.

Claims (1)

[Scope of utility model registration request] A center arm formed in an elongated shape with a contact point at the tip, and a pair of contacts provided at opposite positions with a certain distance centering on the contact point in the same plan view as the contact point of the center arm. a side arm that is slidably fitted to the center arm so that the pair of contact points can move in parallel with the contact point; and a straight line that connects the pair of contact points of the side arm. It is composed of a scale attached to either the center arm or the side arm with a numerical value calculated from a predetermined formula corresponding to the distance between the midpoint and the contact point of the center arm, and the scale is attached to either the center arm or the side arm. A curvature measuring instrument characterized in that the curvature of the surface to be measured can be read from the scale by bringing the contact point of the side arm into contact with the surface to be measured.