JP2003254702A - Measuring tool for measuring squareness for work - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To precisely and easily measure squareness of a work. <P>SOLUTION: The first attaching holes 12c<SB>1</SB>, 12c<SB>1</SB>for a dial gage D parallel to a horizontal part 11 is formed to a vertical part 12 of a square 10. In the square 10, the dial gage D is attached to the vertical part 12 via one of the first attaching holes 12c<SB>1</SB>, 12c<SB>1</SB>and is set on a surface plate A via the horizontal part 11 to make the vertical part 12 faced to the work, the clearance between the work and the vertical part 12 in a reference distance is measured from an under face of the work on the surface plate, and the inclining angle of the work is found to be able to calculate the squareness. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work squareness measuring instrument capable of extremely easily measuring a work squareness.

[0002]

2. Description of the Related Art When determining the squareness of two adjacent planes of a work, a square ruler (square) is used.

The right-angle ruler is constructed by vertically arranging a vertical portion at a right angle on one end of a prismatic horizontal portion which can be stably installed on a surface plate. Therefore, in this product, the outer side surface of the vertical part (hereinafter referred to as the outer side surface) on the surface plate is opposed to the side surface of the work on the surface plate, and the gap between the vertical part and the work piece is observed. Thus, it is possible to determine the perpendicularity between the reference surface of the lower surface of the work and the measurement surface of the work where the vertical portion faces. In addition, the top surface of the horizontal part is pressed against the reference surface of the work, and the inner side surface of the vertical part (hereinafter referred to as the inner side surface) is opposed to the measurement surface of the work. The squareness of and can be determined.

[0004]

According to the prior art, the right angle ruler can only qualitatively determine the squareness of the work by observing the gap formed between the vertical portion and the work. , It is easy to cause individual differences in judgment results,
There is a problem that the squareness cannot be quantitatively measured and evaluated.

In view of the above problems of the prior art, the object of the present invention is to form a mounting hole for a dial gauge in a vertical portion of a right-angled ruler so that the squareness of a work can be accurately and easily measured. The object is to provide a work perpendicularity measuring instrument.

[0006]

The structure of the present invention for achieving the above object is such that a first mounting hole for a dial gauge which is parallel to a horizontal portion is formed on a vertical portion of a right angle ruler. The first mounting hole is located at a reference distance from the lower surface of the horizontal portion, and the gist of the first mounting hole is to insert the stem of the dial gauge from one end so that the measuring head projects toward the other end.

It is to be noted that another first mounting hole can be formed above the first mounting hole with a reference distance therebetween, and each first mounting hole has a pin hole for a lock pin. Can be crossed.

Further, a second mounting hole for the dial gauge, which is parallel to the first mounting hole, can be formed in the vertical portion at a reference distance from the upper surface of the horizontal portion.

Further, another second mounting hole can be formed above the second mounting hole at a reference distance.
A pin hole for a lock pin can intersect with the second mounting hole.

The lock pin may be formed with an arcuate engagement recess that engages with the stem of the dial gauge.

[0011]

According to the structure of the invention, the right angle ruler is
The dial gauge can be mounted from the inside to the outside of the vertical portion through the first mounting hole, and the measuring head of the dial gauge can be projected to the outside surface. Therefore, the right-angled ruler places the horizontal part on the surface plate, the outer surface of the vertical part faces the work on the surface plate, and reads the instructions of the dial gauge to determine the measurement surface of the work and the outer surface of the vertical part. The gap generated between the two is measured, the tilt angle of the measurement surface with respect to the reference plane of the work is found based on the reference distance from the reference surface of the lower surface of the work to the first mounting hole, and the measured gap. The squareness can be easily calculated. Prior to the measurement, the dial gauge is aligned with the origin by, for example, bringing the outer surface of the vertical portion into close contact with the surface plate.

By forming another first mounting hole at a distance of the reference distance, two dial gauges can be mounted on the vertical portion through each first mounting hole. By reading, the gap between the workpiece and the vertical portion can be measured at two points separated by the reference distance, and the squareness of the workpiece can be calculated based on the gap.

By crossing the pin holes for the lock pins with the respective first mounting holes, the dial gauge mounted in the first mounting holes can be reliably locked through the lock pins.

If a second mounting hole is formed in the vertical portion, the second mounting hole is formed.
The mounting hole is at a reference distance from the upper surface of the horizontal portion, and the dial gauge can be mounted by projecting the measuring head to the inner surface of the vertical portion. Therefore, the right-angle ruler is designed so that the upper surface of the horizontal part is in close contact with the reference surface of the work and the inner surface of the vertical part is opposed to the measurement surface of the work, so that the measurement surface of the work and the vertical part It is possible to measure the gap between the side surface and the side surface, and to calculate the squareness of the work.

If another second mounting hole is formed above the second mounting hole, the two dial gauges can be mounted on the vertical portion at a reference distance and the instructions of the two dial gauges can be read. The squareness of the work can be calculated by.

By crossing the pin holes for the lock pins with the second mounting holes, the dial gauge mounted in the second mounting holes can be locked via the lock pins.

The lock pin forming the arcuate engagement recess can engage with the stem of the dial gauge through the engagement recess to securely lock the dial gauge.
The engaging recess is formed in an arcuate cross section larger than the diameter of the stem of the dial gauge to facilitate the attachment and detachment of the dial gauge.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

The work squareness measuring instrument is a right angle ruler 10.
The first and second mounting holes 12c1, 12c1, 12 for the dial gauge D, which are parallel to the horizontal portion 11 with respect to the vertical portion 12 of
c2 and 12c2 are formed (FIGS. 1 and 2). However, FIGS. 2 (A) and 2 (B) are respectively X1-X1 of FIG.
FIG. 6 is an enlarged cross-sectional view taken along the line X2-X2 of FIG.

The dial gauge D comprises a main body D1 having a dial D2 and a measuring head D4 via a stem D3.
The spindle D5 is attached so that it can be retracted. In the body portion D1, the dial D2 can be rotated to set the scale plate D1b to an arbitrary rotational position, and the origin of the needle D1a interlocked with the spindle D5 can be adjusted. However, in addition to the needle D1a, a short hand not shown is provided on the scale plate D1b.

In the right-angle ruler 10, a vertical portion 12 is erected at a right angle on one end of a horizontal portion 11 and is integrally formed as a whole. The horizontal portion 11 is formed into a prismatic shape in which a lower surface 11a and an upper surface 11b are parallel to each other, and has fixing stepped holes 11c and 11c that penetrate vertically. Horizontal part 11
Can be fixed on the surface plate A by screwing bolts M, M inserted into the stepped holes 11c, 11c into the screw holes A1, A1 of the surface plate A. The screw holes A1 and A1 of the surface plate A are
You may replace with the plate nut accommodated in the T groove which is not shown in figure.

The vertical portion 12 includes an outer surface 12a and an inner surface 12
Each of the left and right sides with b is cut off diagonally to form an octagonal cross section. A notch 12e for stress relaxation is provided at a corner between the inner side surface 12b of the vertical portion 12 and the upper surface 11b of the horizontal portion 11.
Are formed. The vertical portion 12 is fitted with the stem D3 of the dial gauge D and is parallel to the horizontal portion 11, and has first and second mounting holes 12c1, 12c1, 12c2, 12c.
c2 are formed alternately. Further, in the vertical portion 12, the upper portion of the inner side surface 12b is cut out in parallel with the lower portion via a step 12f passing through the axis of the second upper mounting hole 12c2.

The lower first mounting hole 12c1 is formed in the horizontal portion 1
The upper and lower first mounting holes 12c1 and 12c1 are located above the lower surface 11a of the first reference distance L1 and are formed apart from each other by the reference distance L1. Therefore, the upper first mounting hole 12c1 is located at the reference distance 2L1 from the lower surface 11a of the horizontal portion 11. The second mounting hole 12c2 below is
The reference distance L2 = L1 is above the upper surface 11b of the horizontal portion 11, and the upper and lower second mounting holes 12c2 and 12c2 are
They are formed apart from each other by the reference distance L2. Therefore,
The second upper mounting hole 12c2 is provided on the upper surface 11 of the horizontal portion 11.
It is located at a reference distance 2L2 = 2L1 from b.

In the vertical portion 12, the first and second mounting holes 1 are provided.
Pin holes 12d and 12 intersecting 2c1 and 12c2 at right angles
d ... are formed (FIGS. 3 and 4). However, in FIG.
In FIG. 4, only the first mounting hole 12c1 is shown. 4A is an enlarged cross-sectional view taken along line X3-X3 of FIG. 1, and FIG. 4B is a sectional view taken along line ZZ of FIG.
It is a sectional view equivalent to a line arrow. Each pin hole 12d corresponds to the pin hole 1
The first mounting hole 12 has an overlapping amount δ of approximately 2d, which corresponds to the radius.
It is formed so as to overlap with c1 or the second mounting hole 12c2 and communicates with the first mounting hole 12c1 or the second mounting hole 12c2 through the opening 12d1.

A lock pin 13 can be inserted into each pin hole 12d. The lock pin 13 is formed with an engaging recess 13a having an arc-shaped cross section smaller than a semicircle, and the male screw 1
An operation knob 13c with a washer 13c1 is attached to one end via a 3b. The maximum width a of the engaging recess 13a is
The diameter is larger than the diameter b of the first and second mounting holes 12c1 and 12c2, and the maximum depth d is slightly larger than the overlapping amount δ.

Therefore, each of the first and second mounting holes 12c1,
12c2, the stem D3 of the dial gauge D respectively
The measurement head D by inserting the
The dial gauge D can be mounted by projecting 4 on the outer surface 12a or the inner surface 12b on the other end side. In addition,
The dial gauge D is positioned by bringing the main body portion D1 into contact with the outer surface 12a or the inner surface 12b. Further, the lock pin 13 is inserted into the pin hole 12d in advance, the engaging concave portion 13a is placed on the opening 12d1 side, and when the dial gauge D is mounted in the first mounting hole 12c1 or the second mounting hole 12c2. The dial gauge D can be locked by rotating the operation knob 13c in the tightening direction to engage the engagement recess 13a with the stem D3 (FIG. 3). Further, the lock pin 13 can release the dial gauge D detachably by loosening the operation knob 13c.

The work squareness measuring instrument is used as follows.

The dial gauge D is, for example, the first upper part.
Through the mounting hole 12c1 (solid line in FIG. 5 (A)) or the first mounting hole 12c1 below (two-dot chain line in FIG. 5 (A)),
The measuring head D4 is projected on the outer surface 12a so that the vertical portion 12
Attach to. Therefore, the dial gauge D is a right-angled ruler 1
0 on the surface plate A, for example, the outer surface 12a is brought into close contact with the outer circumference of the origin setting jig B on the surface plate, and the origin of the scale plate D1b is aligned with the needle D1a via the dial D2 to align the origin. You can The horizontal portion 11 at this time may be fixed on the surface plate A via the bolts M, M. However,
The dial gauge D may be brought into contact with the outer surface 12 a of the vertical portion 12 on the surface plate A to align the origin without using the origin setting jig B.

When the squareness of the work W is measured by using one dial gauge D, the right angle ruler 10 is placed on the surface plate A through the horizontal portion 11 (FIG. 5 (B)), and the reference plane is set. W1
Place the work W on the surface plate A with the bottom face down. Then, when the lower end of the outer side surface 12a is pressed against the work W, for example, the dial gauge D mounted in the upper first mounting hole 12c1.
Is the reference distance 2L from the reference surface W1 of the work W on the surface plate A
The gap g between the measurement surface W2 of the workpiece W and the outer surface 12a in 1 is measured, and based on the reference distance 2L1 and the gap g,
Using the conversion table in Fig. 6, the measurement surface W with respect to the reference surface W1
The inclination angle θ of 2 can be found, and the perpendicularity of the work W can be calculated and measured. However, the tilt angle θ in FIG.
= Tan ^-1 (g / L) (however, L = L1 = 50 mm, L =
2L1 = 100 mm) is shown in a numerical table. In addition,
In the right-angle ruler 10, the dial gauge D can be attached to the lower first mounting hole 12c1 to measure the gap g at the reference distance L1 from the reference surface W1.

For example, the reference distance 2 of the dial gauge D
When L1 = 100 mm and the gap g = 0.022 mm, the inclination angle θ = 45 ″, and when the reference distance L1 = 50 mm and the gap g = 0.036 mm, the inclination angle θ = 2 ′.
30 ". Further, when the reference distance is 2L1 = 100 mm and the gap g is 0.055 mm, the gap g is 0.04.
Inclination angle θ = 1'30 ″ = 90 ″ with respect to 4 mm and gap g
= 0.058 mm, inclination angle θ = 2′00 ″ = 12
0 ″ is proportionally divided, and the inclination angle θ = (120−90) ×
(0.055-0.044) / (0.058-0.04)
4) It can be calculated as + 90≈114 ″ = 1′54 ″.

When the two dial gauges D, D are mounted so that the measuring heads D4, D4 project to the outer surface 12a through the first mounting holes 12c1, 12c1 (FIG. 7), the dial gauges D, D are formed. By contacting the measuring heads D4, D4 of No. 2 with the measuring surface W2 of the work W on the surface plate A, the gaps g1, g2 ≤ g1 at two points apart from the indication of the dial gauges D, D by the reference distance L1 are measured. Based on the reference distance L1 and the gap g = g1-g2, the squareness of the work can be measured using the conversion table of FIG. If two dial gauges D and D are used,
The squareness of the work W can be measured regardless of whether the measurement surface W2 has an acute angle ((A) in the figure) or an obtuse angle ((B) in the figure) with respect to the reference surface W1.

Further, the measuring heads D4 and D4 of the dial gauges D and D are formed by using the second mounting holes 12c2 and 12c2.
By projecting to the inner side surface 12b (FIG. 8), the upper surface 11b of the horizontal portion 11 is brought into close contact with the reference surface W1 of the work W, and the gaps g1 and g2 at two points separated by the reference distance L2 = L1.
g1 is measured, reference distance L2 = L1, gap g = g1-g
The squareness of the work W can be measured based on 2. Also at this time, it is possible to deal with whether the measurement surface W2 has an acute angle ((A) in the figure) or an obtuse angle ((B) in the figure).

The two dial gauges D, D are set to the second
Mounting holes 12c2 and 12c2 of the measuring head D4
, D4 are projected on the outer side surface 12a, and a gap g is formed at two points on the surface plate A, which are separated by the reference distance L2 = L1.
1, g2 may be measured, and the first mounting holes 12c1, 1
The measuring heads D4 and D4 are attached to the inner surface 12b
Alternatively, the upper surface 11b of the horizontal portion 11 may be brought into close contact with the reference surface W1 of the work W, and the gaps g1 and g2 at two points separated by the reference distance L1 may be measured. Moreover, one dial gauge D is attached to one of the first mounting hole 12c1 or the second mounting hole 12c1.
9 (A) to (D), the measurement head D4 is brought into contact with the measurement surface W2 of the work W to align the origin, and the other first attachment hole 12c1 or Replace the dial gauge D in the mounting hole 12c2 of 2,
The gap g = g1-g2 at two points separated by the reference distances L1 and L2 = L1 may be measured ((A) to (D) in the same figure).
Each two-dot chain line). However, in the dial gauge D, the main body portion D1 is surely brought into contact with the vertical portion 12 for positioning.

In the above description, the first and second mounting holes 12c1, 12c1, 12c2 formed in the vertical portion 12,
There may be only one 12c2 each. Also,
The stepped holes 11c and 11c formed in the horizontal portion 11 may be omitted.

[0035]

As described above, according to the present invention, by forming the first mounting hole for the dial gauge parallel to the horizontal portion in the vertical portion of the right angle ruler, the right angle ruler is The dial gauge can be attached to the reference distance from the lower surface of the horizontal portion through the mounting hole of No. 1, and the dial gauge can measure the gap between the measurement surface of the workpiece and the outer surface of the vertical portion. It has an excellent effect that the squareness of can be calculated accurately and simply.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of the entire structure

[Fig. 2] Overall configuration explanatory diagram

FIG. 3 is an enlarged cross-sectional view taken along line YY of FIG.

FIG. 4 is an enlarged cross-sectional explanatory view of an essential part.

[Figure 5] Usage status explanatory diagram

[Figure 6] Conversion chart of tilt angle

FIG. 7 is an explanatory view of a usage state showing another embodiment (1)

FIG. 8 is a use state explanatory view (2) showing another embodiment.

FIG. 9 is a use state explanatory view (3) showing another embodiment.

[Explanation of symbols]

D ... Dial gauge D3 ... Stem D4… Measuring head L1, L2 ... Reference distance 10 ... Right angle ruler 11 ... Horizontal section 11a ... bottom surface 11b ... upper surface 12 ... Vertical part 12c1 ... First mounting hole 12c2 ... Second mounting hole 12d ... Pin hole 13 ... Lock pin 13a ... engaging recess

Claims (7)

[Claims] 1. A first mounting hole for a dial gauge, which is parallel to the horizontal part, is formed in the vertical part of the right-angled ruler, and the first mounting hole is at a reference distance from the lower surface of the horizontal part. A squareness measuring instrument for a work, wherein a stem of a dial gauge is inserted from one end and a measuring head is projected to the other end side. 2. The work perpendicularity measuring instrument according to claim 1, wherein another first mounting hole is formed above the first mounting hole with a reference distance therebetween. 3. A pin hole for a lock pin intersects with each of the first mounting holes.
Alternatively, the work perpendicularity measuring instrument according to claim 2. 4. The second mounting hole for a dial gauge, which is parallel to the first mounting hole, is formed in the vertical portion at a reference distance from the upper surface of the horizontal portion. The work perpendicularity measuring instrument according to claim 3. 5. The work perpendicularity measuring instrument according to claim 4, wherein another second mounting hole is formed above the second mounting hole with a reference distance therebetween. 6. The pin hole for a lock pin intersects with the second mounting hole, respectively.
Alternatively, the work perpendicularity measuring instrument according to claim 5. 7. The work perpendicularity measuring instrument according to claim 3, wherein the lock pin is formed with an arc-shaped engaging recess that engages with the stem of the dial gauge.