JPS6242323Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for measuring the perpendicularity of a drilled screw hole, that is, whether the screw is machined perpendicularly to the screw hole opening plane.

Conventionally, the perpendicularity of screw holes has not been required to be so precise as to be a problem. Recently, screws have come to be used in, for example, ultrasonic transmission parts, and in such cases, perpendicular screw holes are required for accuracy due to precise screw machining. In addition, there are an increasing number of cases in which the perpendicularity of screw holes is required, but the reality is that there is no suitable device.

The invention of the present application was made based on this situation, and provides an inexpensive device that can easily measure the perpendicularity of a screw hole with a simple operation.
A threaded shaft member having a male thread at its tip to be threaded into a threaded hole to be measured, and a means for fixing the male thread to the threaded hole in a threaded state, and is rotatable in the axial direction and around the outer circumference of the threaded shaft member. A slide member that is fitted into the screw shaft member and has a measurement point member attached to its lower surface, and a measurement reading means that is attached to the screw shaft member and reads the axial displacement of the slide member with respect to the opening plane of the screw hole to be measured. This is a characteristic feature.

First, as shown in Fig. 1, a screw hole T is drilled.
The inclination α of the axis C with respect to the aperture plane S is called a perpendicularity, and the present invention provides an apparatus for substantially measuring this perpendicularity, which will be explained in detail below with reference to examples.

As shown in FIG. 2, the device according to the present invention includes a screw shaft member 1, a slide member 2, and a screw shaft member 1.
It has measurement reading means 3 such as a dial gauge attached to the. To explain in more detail,
The screw shaft member 1 consists of a screw shaft 11 and a draw screw 12, and the screw shaft 11 has a male thread 11a formed at its tip that accurately screws into the screw hole to be measured, and a shaft with a small diameter in the axial direction following the male thread 11a. A male threaded portion 11b is formed, and a male threaded portion 11c having a pitch larger than the pitch of the thread to be measured is formed on the axial line continuing from the male threaded portion 11c.
d, and a manual handle 11e is integrally attached to this shaft portion 11d. The draw screw 12 has a male screw 12 similar to the male screw 11a at the tip.
a is formed, and an opening 12 is formed in the axial direction from this end surface.
b is formed through the opening 12b, into which the male threaded portion 11b of the screw shaft 11 slides, and near the opposite end of the opening 12b is a screw hole 12c into which the male threaded portion 11c of the screw shaft 11 is screwed. The screw shaft member 1 is constructed by assembling the screw shaft 11 and the draw screw 12 as shown in FIG.

The slide member 2 is slidably fitted to the outer periphery of the draw screw 12 constituting the screw shaft member 1 so as to be slidable in the axial direction, and its movement in the axial direction is limited by the flange 12d of the draw screw 12 and the retaining ring 4. A steel ball 5 serving as a measurement point is fixed at one location. Furthermore, a stepped portion 21 perpendicular to the axis of the screw shaft member is provided on the outer periphery.
The gauge head 31 of the dial gauge 3 fixed to the flange 12d of the draw screw 12 constituting the screw shaft member 1 is configured to come into contact with the stepped portion 21 during measurement.

Next, the operation of the embodiment apparatus having the above-mentioned configuration will be explained.

First, turn the manual handle 11e to tighten the screw shaft 1.
1 upward in the figure, the upper end surface of the male thread 11a is brought into contact with the lower end surface of the male thread 12a of the draw screw 12, and both male threads are fixed integrally. In this state, both male screws are screwed into the screw hole T to be measured.
After further screwing together by a certain amount, the manual handle 11e is turned in the opposite direction to that described above. By this operation, the pitch of the male thread part 11c and the threaded hole 12c is made larger than the pitch of the thread to be measured, so that the male thread 11a and the male thread 12a are pressed in the direction away from each other with respect to the threaded hole T to be measured. , the screw shaft member 1 is fixed into the screw hole to be measured. Next, the steel ball 5 for the measurement point on the bottom of the slide member 2
is in contact with the opening plane S of the screw hole T to be measured, so the scale of the dial gauge 3 is set and the slide member 2 is rotated. Thereby, the axial displacement of the stepped portion 21 of the slide member 2, that is, the substantial perpendicularity of the screw hole T can be read.

As explained above, the present invention provides an inexpensive device that can easily measure the squareness of a screw hole by using the axial displacement of the slide member 2 as the squareness of the screw hole, with a simple structure and operation. In addition, by setting the male threads 11a and 12a of the screw shaft member to the through-side thread gauge dimensions, the present device has the advantage of being able to check not only the squareness of the screw hole but also the thread shape at the same time.

[Brief explanation of the drawing]

FIG. 1 is an explanatory view of the perpendicularity, and FIG. 2 is a partially sectional front view showing an embodiment of the present invention. Explanation of symbols, 1... Screw shaft member, 11... Screw shaft, 12... Draw screw, 2... Slide member, 3
... Measurement reading means, 4 ... Retaining ring, 5 ... Steel ball for measurement point.

Claims (1)

[Claims for Utility Model Registration] 1. A screw shaft member having a male thread at its tip that is screwed into a screw hole to be measured and a means for fixing the male screw to the screw hole in a screwed state, and the screw shaft member. A slide member that is axially and rotatably fitted to the outer periphery of the screw shaft member and has a measurement point member attached to its lower surface, and a measurement device that reads the axial displacement of the slide member with respect to the opening plane of the screw hole that is attached to the screw shaft member and is to be measured. A device for measuring the squareness of a screw hole, comprising: a reading means; 2. A straight screw hole according to claim 1 of the utility model registration claim, which has a stepped portion perpendicular to the axis of the screw shaft member on the outer periphery of the slide member, and is configured such that the measuring tip of the measurement reading means comes into contact with the stepped portion. Angle measuring device.