CN2793686Y - Arc radius measuring equipment - Google Patents

Abstract

The utility model relates to an arc radius measuring apparatus which comprises two rulers. The handle is fixed at the centers of the rulers after passes through a hollow pipe vertically. A pair of right angle motion bars which are provided with ruler holes and pointers are inserted in the hollow pipe. The two rulers are fixed vertically, and the surface of a ruler is provided with hair lines. When the utility model is used, two points are determined on an arc firstly, and the two right angle motion bars are adjusted to cause the pointers to align to the determined points on the arc. The distances between the determined points and midpoints of the rulers are respectively read, the distance from a crossing point of the ruler B and the arc to the ruler A is read, and the three unknown quantities are carried in the formula R=***/(2*Z) to acquire the radius length. The utility model has the advantages of reasonable structure, wide use, accurate and quick measurement, etc.

Description

Apparatus for measuring radius of circular arc

Technical field the utility model relates to a kind of survey instrument, especially a kind of apparatus for measuring radius of circular arc.

Technical background is present, and people can use a large amount of survey instruments that various data and figure are measured when teaching and building.But there is not a kind of survey instrument to measure arc radius quickly and accurately now, people must use multiple instrument combined measurement and calculate various data and just can calculate arc radius, when application operating, bother very much and have a gross error, make troubles for teaching and work.In order to save time and operation, we are sought after a kind of instrument that can quick and precisely measure arc radius.

The summary of the invention the purpose of this utility model provides a kind of apparatus for measuring radius of circular arc, is used to solve the common survey instrument problem of measurements and calculations arc radius fast.

For achieving the above object, the utility model apparatus for measuring radius of circular arc, comprise two ruler A, B, handle is vertically through the center position that is vertically fixed on ruler A behind the mid point of a both ends open hollow tubular, hollow tubular and ruler A keeping parallelism, have a pair of right angle motion bar that has chi hole and pointer to be inserted in the hollow tubular, two chi holes are enclosed within respectively on the ruler A; Two mutual vertical fixing of ruler, and have finedraw along long side direction on ruler B surface; Be equipped with scale and numerical value on the surface of two rulers.

After adopting said structure, on circular arc to be measured, determine 2 points earlier, two motion bars about adjustment, make the pointer on two motion bars aim at two definite points of circular arc, and read respectively determine point to ruler A mid point apart from length x, y, read ruler B and circular arc intersection point distance z again, at last these three unknown quantitys are brought into formula to ruler A $R=\sqrt{(x^2+z^2)\×(z^2+y^2)}\÷(2\×Z)$ Can draw the true length of radius to be measured.

The utility model has the advantages that: rational in infrastructure, use extensively, measure accurately fast, and save time and operation, can effectively increase work efficiency.

Description of drawings Fig. 1 is the one-piece construction synoptic diagram of the utility model apparatus for measuring radius of circular arc.

Embodiment as shown in Figure 1, the utility model apparatus for measuring radius of circular arc, comprise two ruler 1-1,1-2, handle 2 is vertical through the center position that is vertically fixed on ruler 1-1 behind the mid point of a both ends open hollow tubular 3, hollow tubular 3 and ruler 1-1 keeping parallelism, have a pair of right angle motion bar 4 that has chi hole 5 and pointer 6 to be inserted in the hollow tubular 3, two chi holes 5 are enclosed within respectively on the ruler 1-1; Ruler 1-1 is in the same place with the mutual vertical fixing of ruler 1-2, and has finedraw 7 on ruler 1-2 surface along long side direction; Be equipped with scale and numerical value on the surface of two ruler 1-1,1-2.Wherein, be provided with the steel hook, also be provided with corresponding with it steel hook, thereby guarantee that motion bar 4 can not come off when sliding on the top of the insertion portion of right angle motion bar 4 at hollow tubular 3 opening parts; Because circular arc has certain radian, in order to reduce error, on ruler 1-2, have finedraw 7, can be from finedraw 7 when ruler 1-2 and circular arc intersect reading numerical values.When using, the user determines two points in advance on circular arc to be measured, two motion bars 4 about adjustment, make the pointer 6 on two motion bars 4 aim at two definite points of circular arc, and read respectively determine point to ruler 1-1 mid point apart from length x, y, read ruler 1-2 and circular arc intersection point distance z again, at last these three unknown quantitys are brought into formula to ruler 1-1 $R=\sqrt{(x^2+z^2)\×(z^2+y^2)}\÷(2\×Z)$ In can draw the true length of arc radius to be measured.In measuring process, saved a large amount of survey instruments, and can make things convenient for fast and accurately and measure.

Claims (1)

1, a kind of apparatus for measuring radius of circular arc, comprise two rulers (1-1), (1-2), it is characterized in that: handle (2) vertically sees through the center position that is vertically fixed on ruler (1-1) behind the mid point of a both ends open hollow tubular (3), hollow tubular (3) and ruler (1-1) keeping parallelism; Have a pair of right angle motion bar (4) that has chi hole (5) and pointer (6) to be inserted in the hollow tubular (3), two chi holes (5) are enclosed within respectively on the ruler (1-1); Ruler (1-1) and ruler (1-2) be vertical fixing mutually, and has finedraw (7) on ruler (1-2) surface along long side direction; Surface at two rulers (1-1), (1-2) is equipped with scale and numerical value.