JPH0684304U - Key groove depth measuring tool - Google Patents

Abstract

(57) [Summary] [Object] The present invention provides a keyway depth measuring tool capable of accurately measuring the depth of the keyway simply by placing the measuring tool on the keyway of a shaft-shaped work. [Structure] A guide 11 having the same shape as the key groove 4 is provided in the center,
Supporting pieces 14 that straddle the shaft-shaped work 3 and contact the outer peripheral surface of the work 3 are provided on both sides of the guide 11.
1 The hole 12 opened in the center of the probe 1 of the dial gauge 6
Is characterized by being inserted.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a measuring tool for measuring the depth of a keyway provided on a shaft-shaped work.

[0002]

[Prior art]

 Conventionally, in order to measure the depth of a half-moon shaped key groove provided on a shaft-shaped work, as shown in FIGS. 3 and 4, the work 3 is supported by both centers 2 on a surface plate 1, With the key groove 4 facing upward, a gauge head of a dial gauge 6 attached to a height gauge 5 located on the surface plate 1 is inserted into the key groove 4 for measurement.

[0003]

[Problems to be solved by the device]

 In order to measure the depth of the half-moon shaped key groove 4 with the above conventional measuring tool, first, measure the height of the deepest part of the key groove 4, remove the contact point from the key groove 4, and rotate the work 3. The probe is brought into contact with the outer peripheral surface of the work 3 to measure the depth of the key groove 4 by the difference H from the height of the deepest part of the key groove 4. Therefore, the measurement operation needs to be performed twice, and the work 3 needs to be rotated, and it is difficult to properly abut the gauge of the dial gauge 6 to the deepest portion in the half-moon shaped key groove 4. .

An object of the present invention is to provide a keyway depth measuring tool that eliminates the above-mentioned conventional problems.

[0005]

[Means for Solving the Problems]

 A feature of the present invention for achieving the above object is that a guide having the same shape as the key groove is provided in the center, and a support that abuts the outer peripheral surface of the work straddling the shaft-shaped work on both sides of the guide. A piece is provided, a hole penetrates through the center of the guide, and a gauge head of a dial gauge is fitted into the hole.

[0006]

[Action]

 With the above configuration, by inserting the guide into the keyway, the support pieces on both sides of the guide come into contact with the outer circumference of the workpiece and are centered with one touch, and the dial gauge probe is correctly positioned at the deepest part of the keyway. The depth can be measured.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 and 2, reference numeral 3 is a shaft-shaped work having a half-moon shaped key groove 4.

Reference numeral 10 denotes a measuring tool body according to the present invention. The measuring tool main body 10 has a guide 11 having the same shape as the key groove 4 in the center, and support pieces 14 that straddle the work 3 and contact the outer peripheral surface of the work 3 are formed on both sides of the guide 11.

In addition, a hole 12 is provided so as to penetrate the center of the guide 11, and a gauge head 13 of the dial gauge 6 is fitted into the hole 12.

Since the present invention has the structure as described above, first, the guide 11 of the same model as the work 3 is inserted into the key groove of the model, and the pointer of the dial gauge 6 is set to zero.

Then, the guide 11 is inserted into the key groove 4 of the work 3. As a result, the support pieces 14 on both sides contact the outer circumference of the work 3 and the measuring tool body 10 is centered with respect to the keyway 4, and the probe of the dial gauge 6 is correctly positioned at the deepest part of the keyway 4. However, the value of the dial gauge 6 at that time is read and measured as an error with respect to the normal depth.

The measuring tool of the present invention is effective in measuring the depth of the half-moon shaped key groove 4 as in the above-mentioned embodiment, but if the guide shape corresponds to the flat key groove, it is flat. It is possible to measure the depth of the keyway of the shape, and is not necessarily limited to the measurement of the half-moon shaped keyway.

[0013]

[Effect of device]

 As described above, according to the present invention, the guide having the same shape as the key groove is provided in the center, and the support pieces that straddle the shaft-shaped work and contact the outer peripheral surface of the work are provided on both sides of the guide. Since the configuration is such that the dial gauge probe is inserted through the hole at the center, the depth of the keyway can be accurately measured simply by placing the measuring tool on the keyway of the shaft-like work. It has the effect that

[Brief description of drawings]

FIG. 1 is a sectional view of the present invention.

FIG. 2 is a side sectional view of FIG.

FIG. 3 is an explanatory view of a key groove depth measuring procedure using a conventional measuring tool.

FIG. 4 is a side sectional view of FIG.

[Explanation of symbols]

 3 Work 4 Key Groove 6 Dial Gauge 10 Measuring Tool Main Body 11 Guide 12 Hole 13 Measuring Element 14 Supporting Piece

Claims (1)

[Scope of utility model registration request] 1. A guide having the same shape as a key groove is provided in the center,
Providing support pieces on both sides of this guide that straddle the shaft-shaped work and come into contact with the outer peripheral surface of the work. Measuring tool.