JPH06185903A - Screw depth measuring device - Google Patents

Abstract

PURPOSE:To provide a screw depth measuring device which can measure effective screw depth directly with high accuracy thus allowing formation of a screw hole as regulated. CONSTITUTION:A slide tube 3 is fit slidingly to a threaded rod 2 being screwed into a screw hole 1 to be measured and a part 4 abutting on the periphery of the screw hole 11 is formed at the lower end of the slide tube 3. The threaded rod 2 can be screwed freely into the screw hole 1 while abutting the part 4 on the periphery of the screw hole 1 and the slide tube 3 is provided with a scale mechanism 9 for indicating the movement of the threaded rod 2 with respect to the slide tube 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw depth measuring device.

[0002]

2. Description of the Related Art Conventionally, when a screw is erected, it is inspected whether or not it meets an appropriate standard, and further machining is corrected according to the inspection result.

In such a case, the depth of the screw hole of the standing screw is measured, but conventionally, a caliper or the like is simply inserted into the screw hole to measure the screw depth.

[0004]

However, the bottom edge of the screw portion of the screw hole does not coincide with the screw hole edge, and the bottom portion of the screw hole is machined into a V-shaped cross section.

Therefore, in the measurement using a caliper, the depth of the screw hole itself is measured, and the screw portion (the depth of the screw itself) is measured.
Is not what you are measuring. That is, conventionally, the effective screw depth of the screw hole is not measured, but the effective depth of the screw hole is measured to estimate the effective screw depth, so that the effective screw depth cannot be measured with high accuracy. It was

The present invention can directly measure the effective screw depth,
It is an object of the present invention to provide a screw depth measuring device capable of highly accurate measurement and, as a result, capable of forming a screw hole conforming to the standard.

[0007]

The gist of the present invention will be described with reference to the accompanying drawings.

A slide cylinder 3 is fitted in a screw rod 2 screwed into a screw hole 1 to be measured so as to be slidable along the screw rod 2.
An abutting portion 4 that abuts around the opening of the measured screw hole 1 is formed at the lower end of the slide tubular body 3, and the abutting portion 4 of the slide tubular body 3 abuts around the opening of the measured screw hole 1. The screw rod 2 is configured to be screwed into the screw hole 1 to be measured while maintaining the state, and the screw rod 2 or the slide barrel 3 is a scale for indicating the screwing movement value of the screw rod 2 with respect to the slide barrel 3. The present invention relates to a screw depth measuring device characterized in that a mechanism 9 is provided.

On the peripheral surface of the screw rod 2, a pointing rod 5 for projecting a graduation pointing function is provided so as to project, and a slide guide groove 6 to be fitted into the pointing rod 5 is formed in the lengthwise direction of the slide barrel 3. By fitting the slide guide groove 6 and the pointing rod 5 together, the slide cylinder 3 is slidable along the screw rod 2 in a non-rotating state, and the upper edge 7 of the slide guide groove 6 is slidable.
When the indicating rod 5 is brought into contact with and locked to the slide rod 3, the abutting portion 4 provided at the lower end of the slide cylinder 3 and the lower end of the screw rod 2 are substantially flush with each other. 6. The graduation mechanism 9 is constructed by forming a graduation display 8 on the edge of the slide guide groove 6 in which the graduation display 8 increases toward the lower end and the top edge 7 of the reference numeral 6 becomes zero scale display. The present invention relates to the described screw depth measuring device.

[0010]

When the screw rod 2 is screwed into the screw hole 1 to be measured, the contact portion 4 provided at the lower end of the slide cylinder 3 is kept in contact with the periphery of the opening of the screw hole 1 to be measured. The screw rod 2 moves downward with respect to the slide cylinder 3 that does not move downward.

By reading the screwing movement value displayed by the scale display mechanism 9 in a state where the screw rod 2 is screwed in to a depth where it can be screwed in, the depth of the screw portion of the screw hole 1 to be measured, that is, the effective screw The depth will be measured.

[0012]

[Example] A turning knob 10 is provided on the upper end of a screw rod 2 having a male thread cut from the lower end to the central part.
The slide cylinder 3 is fitted in the through state.

Further, an indicator rod 5 is formed at the uppermost end portion of the male screw at the central portion of the screw rod 2 so as to project forward and backward in a penetrating state. On the other hand, a slide guide groove 6 to be fitted to the indicating rod 5 is formed in the slide cylindrical body 3 in the longitudinal direction, and the slide cylindrical body 3 is attached to the screw rod 2 with the indicating rod 5 and the slide guide groove 6 The guide is used as a guide so that it can slide in the length direction in a non-rotating state.

Further, in this embodiment, a graduation display 8 increasing from the upper end to the lower end is formed on the edge portion of the slide guide groove 6, and the upper end edge 7 of the slide guide groove 6 is displayed as a zero graduation. It is set so that the lower end edge (abutting portion 4) of the slide cylinder 3 and the lower end edge of the screw rod 2 are flush with each other when the indicator rod 5 is brought into contact with and locked to the upper end edge 7 of the guide groove 6. ing.

Therefore, when the abutting portion 4 of the slide cylinder 3 is abutted and set around the opening of the measured screw hole 1, the screw rod 2 is just screwed into the measured screw hole 1 at the lower end. position
It is arranged at the (zero screw-in position), and as the screw rod 2 is screwed into the screw hole 1 to be measured by turning the turning knob portion 10, the indicator rod 5 moves down the scale display 8 to read it. When the insertion movement value increases and the screw rod 2 is screwed in to a position where it cannot be further screwed, the screwing movement value is calibrated by the indicator rod 5 and the scale display 8 configured as described above. By reading with 9, the effective screw depth of the measured screw hole 1 is measured.

When inspecting the screw precision of the screw hole 1 to be measured, a screw gauge is screwed in for inspection.
The accuracy of the screw rod 2 can be improved, and the screw rod 2 can be used as a screw gauge, so that the screw precision (thread effective depth) can be measured and inspected at the same time.

[0017]

Since the present invention is constructed as described above,
The effective screw depth can be measured directly, and highly accurate measurement is possible. As a result, it is an excellent screw depth measuring device that can form screw holes that meet the standard.

[Brief description of drawings]

FIG. 1 is a front view of the present embodiment.

FIG. 2 is a plan sectional view of the present embodiment.

FIG. 3 is a front view of a usage state of the present embodiment.

[Explanation of symbols]

 1 Screw hole to be measured 2 Screw rod 3 Slide cylinder 4 Abutting part 5 Indicating rod 6 Slide guide groove 7 Top edge 8 Scale display 9 Scale mechanism

Claims (2)

[Claims] 1. A slide cylinder is slidably fitted along a screw rod into a screw rod screwed into the screw hole to be measured, and the lower end of the slide cylinder is brought into contact with the periphery of the opening of the screw hole to be measured. An abutting portion is formed, and the screw rod is configured to be screwed into the screw hole to be measured while maintaining the state in which the abutting portion of the slide cylinder is in contact with the periphery of the opening of the screw hole to be measured. A screw depth measuring device comprising a slide cylinder provided with a scale mechanism for displaying a screwing movement value of a screw rod with respect to the slide cylinder. 2. An instruction rod for projecting a graduation instructing action is projectingly provided on a peripheral surface of the screw rod, and a slide guide groove is formed in the lengthwise direction of the slide cylinder so as to be fitted to the instruction rod. By fitting the slide guide groove and the indicator rod, the slide cylinder is configured to be slidable along the screw rod in a non-rotating state, and when the indicator rod abuts and locks on the upper edge of the slide guide groove, The abutting portion provided on the lower end of the slide cylinder and the lower end of the screw rod are configured to be substantially flush with each other. The upper edge of the slide guide groove indicates zero scale and the scale display increases toward the lower end. 2. The screw depth measuring device according to claim 1, wherein a scale display is formed on the edge of the slide guide groove to form the scale mechanism.