JPH04297802A - Taper measuring instrument - Google Patents

Abstract

PURPOSE:To obtain a taper measuring instrument which can cope with the measurement of an inside taper angle of a measurement object over a wide range by one unit. CONSTITUTION:A movable side cylindrical probe 11 smaller than a fixed side probe 10 is attached to one end of a shaft 9 rotatably held by the fixed side probe 10. The fixed side probe 10 is fitted with a scale body 12 elucidating the distance and the taper angle between probes 10, 11 in parallel with the above-mentioned shaft 10. On the other hand, the other end of the shaft 9 is fitted with a shaft-rotating knob 16, and a sensor division 17 which overlaps the scale body 12 and indicates it by rotating the shaft 9 is attached between this knob ad the shaft 9.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a taper measuring instrument used for measuring the angle of an inner taper.

0002

[Prior Art] Figures 3 to 6 are, for example,
412 is a diagram showing a conventional taper measuring instrument disclosed in Publication No. 412. In the figure, 1 is a measuring instrument body, 2 is an operating shaft that moves up and down by an internal thread 1a of this measuring instrument main body 1, and 3 is this operating shaft 2. Three measuring elements 4 reciprocate in the radial direction in conjunction with the vertical movement of the measuring instrument body 1;
5 is a ratchet that rotates the operating shaft 2 and moves the measuring element 3, and 6 is a taper angle display scale.

The conventional taper measuring instrument is constructed as described above, and to measure the taper angle, first, before measurement, remove dirt, burrs, etc. from the taper hole, insert the measuring instrument 1 gently, and then insert the stator 4. abut against the inner surface of the tapered hole. Then, by rotating the ratchet 5, the probe 3 is pushed outward and the ratchet 5 is rotated until it rotates idly. By doing so, the entire measuring instrument 1 can be positioned within the tapered hole without wobbling. The dimensions of each part of the measuring instrument 1 in this state are
As shown in the figure, the taper hole diameter of the part where the measuring element 3 comes in contact is L1, the taper hole diameter of the part where the stator 4 comes in contact is L2,
Further, if the distance from the measuring element 3 to the stator 4 is H1, the taper angle α is given by the following equation. α/2=tan-1(L1/2-L2/2)/H1 Therefore, the relationship between L2 and H1 determined by the measuring instrument 1 and L1 that changes depending on the tapered hole to be measured is determined in advance, and this is calculated on the angle scale. 6, the taper angle α can be directly read (see FIG. 5).

0004

[Problems to be Solved by the Invention] In the conventional taper measuring instrument as described above, the taper angle scale 6 is carved on the circumference of the ratchet 5, and the taper angle measuring range is within the inner diameter thread of the measuring instrument body 1. Since it is limited to one pitch of 1a, the measurement range is narrow, there is no versatility, and there are problems in that several measuring instrument bodies 1 are required depending on the taper shape.

[0005] The present invention has been made to solve the above problems, and an object of the present invention is to provide a taper measuring instrument capable of measuring a wide range of taper angles with a single measuring instrument main body.

[0006]

[Means for Solving the Problems] This invention has been made to solve the above problems, and includes a plurality of cylinders having different diameters arranged on the same axis, one on the fixed side and the other on the same axis. The movable measuring element is movable, and the shaft is provided with a detecting section for detecting the taper angle from the positional relationship between the fixed measuring element and the movable measuring element.

In the present invention, a plurality of cylinders having different diameters are arranged on the same axis, one is a fixed side measuring element, the other is a movable side measuring element which is movable on the same axis, and the fixed side is attached to the above shaft. By providing a detection section that detects the taper angle from the positional relationship between the side measuring element and the movable measuring element, the detecting section can read the taper angle based on the amount of movement of the movable measuring element.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 and 2 are views showing an embodiment of the present invention, in which 8 is a taper measuring device, 9 is a shaft forming the center of this taper measuring device, 10 is attached to this shaft, This is a fixed side measuring element that rotatably supports the shaft 9, and has a cylindrical shape. A movable measuring element 11 is mounted on one end of the shaft 9 so as to face the fixed measuring element, and is cylindrical and has an outer diameter smaller than that of the fixed measuring element 10. . Reference numeral 12 denotes a scaled body, which includes a fixing part 14 fixed to the side wall of the fixed measuring element 10 with a screw 13, and a body arranged on the shaft 9, which determines the taper angle and the fixed measuring element 1.
0 and a tapered scale portion 15 in which the distance from the movable measuring element 11 is engraved. 16 is a knob,
It is fixed to the other side of the shaft 9 with a screw 13, and rotates the shaft 9. Reference numeral 17 denotes a detection section, which is held by the knob 16, covers the shaft 9, overlaps with the taper scale section 15, and moves back and forth with the rotation of the shaft 9 to read the scale of the taper scale section 15. Instruct. Reference numeral 18 denotes an object to be measured, which has an inward taper whose diameter gradually decreases from the reference end surface.

In the taper measuring instrument configured as described above, after the fixed side probe 10 is inserted into the object to be measured 18 and stabilized, the knob 16 is rotated until the movable side probe 11 stops. The taper angle is determined by reading the taper angle on the upper scale of the taper scale section 15 indicated by the detecting section 17 at this time, or by reading and calculating the moving distance of the lower movable measuring element 11. Can be done.

0010

[Effects of the Invention] As explained above, the present invention has a plurality of cylinders having different diameters arranged coaxially, one of which is a fixed measuring element, and the other is a movable measuring element which is movable on the same axis. By providing a detection part on the shaft to detect the taper angle from the positional relationship between the fixed side measuring element and the movable side measuring element,
Since the taper angle can be measured according to the amount of movement of the movable measuring element, it is possible to measure a wide range with one device, and the taper angle can be easily measured using an inexpensive method.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged view of a detection section showing an embodiment of the present invention. .

FIG. 3 is a perspective view of a conventional taper measuring instrument.

FIG. 4 is a cross-sectional view of a conventional taper measuring instrument.

FIG. 5 is a partially enlarged perspective view of a conventional taper measuring instrument.

FIG. 6 is a partial sectional view showing a measuring state of a conventional taper measuring instrument.

[Explanation of symbols]

8 Taper measuring device 9 axis 10 Fixed side probe 11 Movable side probe 17 Detection section

Claims (1)

[Claims] Claim 1: A plurality of cylinders having different diameters are coaxially arranged, one is a fixed side measuring element, the other is a movable side measuring element which can be freely moved on the same axis, and the fixed side measuring element is attached to the shaft. 1. A taper measuring instrument characterized by being provided with a detecting section that detects a taper angle from the positional relationship between the movable measuring element and the movable measuring element.