JPS625101A - Vernier caliper - Google Patents

Abstract

PURPOSE:To measure directly a center distance of 2 pins or 2 holes without complicated calculation, by constructing a vernier caliper with fixed beak, movable beak fastened to a sliding body, vernier scale inserted in the sliding body and the reference contact surface positioning the vernier scale. CONSTITUTION:A fixed beak 3 and a movable beak 4 are brought into contact by moving a sliding body 2, the end point 10 of a vernier scale 7 with the reference contact surface 5 of the fixed beak base, a set screw 8 is tightened, the venier scale 7 is fixed to the sliding body 2 for a vernier caliper ready for use. Now, a pin 12 is fixed between fixed and movable beaks with a screw 6, the vernier scale provided with the sliding body 2 is made to travel by untightening a screw 8, its end part 10 is brought to contact with the surface 5 for bring an indication of a pin 12 diameter to zero, and measurement of the external dimensions of the pin 12, 12' allows directly a reading of a center distance. When the pins are of different shapes, the fixed and the movable beaks are set apart by the sum of each radius and the measurement is proceeded according to above procedures and the center distance of 2 holes can also be measured directly, without intricated calculation.

Description

[Detailed Description of the Invention] [Summary] By integrating a movable vernier and a movable beak so that they are mutually movable and fixed, the center distance between two pins or two holes can be measured in a direct-readable manner. I can do it.

[Industrial application field]

The present invention relates to a caliper that can directly read the center distance between two pins or holes.

[Conventional technology]

When determining the center distance between two pins or holes using a caliper, conventionally known standard calipers first determine the distance between the outer sides of both pins, and then measure the diameters of both pins. It is common to calculate the distance by adding the two, dividing the added value into two, and subtracting this value from the distance between the two outer sides. The same applies to the distance between holes, but in this case, the inner diameter is measured.

In addition, there are calipers with conical or tapered beaks that allow for direct measurement, but most of these calipers are dedicated to measuring center distances.

[Problem that the invention seeks to solve]

According to the above-mentioned conventional measurements, the former is cumbersome because it is determined indirectly by calculation results and cannot be read directly, and the latter cannot be used as a standard caliper.

[Means for solving problems]

A means for solving the above problems is a fixed beak provided at the end of the main scale, and a movable beak that can move near and far from the fixed beak while being guided by the main scale. a vernier that is fitted into the movable beak and is movable in the guiding direction and is provided with a fixing means; and a reference contact surface for positioning the vernier end by abutting it on the main scale. Achieved by calipers.

[Effect]

When measuring between pins or holes of the same diameter, measure the diameter of one pin or hole, fix the movable beak to the main scale,
The vernier is fixed to the movable beak by bringing the vernier into contact with the reference impact surface. By doing this, the diameter of one side, that is, the value equivalent to the sum of both radii, is set at the zero position on the main scale, so the movable scale can be moved and both pins or both outer distances can be set. If a block gauge of a different size is inserted, measurement can be performed based on the absolute value, and this method allows measurement of the size between pins (holes) of different diameters.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to embodiments and drawings.

FIG. 1 shows a front view of an embodiment of a caliper according to the present invention, and FIG. 2 shows a cross section taken along line A-A'. In the figure, 1 is the main scale, which has a length and scale that can measure up to, for example, 250 mm. Reference numerals 3 and 3' designate fixed beaks for measuring the outer diameter and protruding from the end of the main scale 1.

Reference numeral 2 denotes a sliding body that is fitted onto the main scale 1 to expose a scale surface and can slide freely, and has movable beaks 4, 4' protruding from its ends for measuring the outer diameter and inner diameter. 6 is a set screw for fixing the sliding body 2 to the main scale 1.

Reference numeral 7 denotes a vernier scale that fits on the lower side of the sliding body 2 and is movable in the same direction as the length direction of the main scale 1, and the movable distance is determined by the length of the cut that avoids the movable beak 4.

It is possible. 8 is a set screw for fixing the vernier 7 to the sliding body 2.

Reference numeral 9 is a boot stick fixed to the base of the fixed beak 3 and is a stylus.

The configuration is as described above, and the operation will be described below.

The set screw 6 is loosened, the sliding body 2 is moved along the main length as a guide, and the fixed beak 3 and the movable beak 4 are brought into contact.

The parallel ends of the other beaks 3' and 4' naturally coincide. Then, tighten the set screw 8 to integrally fix the vernier scale 7 to the sliding body 2. By doing so, the zero of the vernier scale 7 coincides with the zero of the main scale 1, so that the caliper can be used as a standard known caliper.

Next, to explain the main feature of the present invention, when determining the center distance between two pins 12 and 12' having the same diameter, one pin 12 is sandwiched between the fixed beak 3 and the movable beak 4 as shown in the figure. Fix with set screw 6. Next, the other screw 8 is tightened and fixed, and one set screw 6 is loosened and released.

In the above manner, the value on the scale of the diameter of the pin 12 is zero.

In other words, it corresponds to the sum of the respective radii of the two pins 12.12". Therefore, as shown by the two-dot chain line in the figure, the movable beak 4 is moved between the two outer sides of the pin 12.12" and the beak 3.
4 in contact with each other and sandwich this space between them.

It is obvious that this means that the scale indicates the dimensions excluding the respective radii of both bins (12.12"), which means that the center-to-center distance can be read directly. .

When measuring between two holes of the same diameter, use the inner diameter measuring beak 3',
4" can be carried out in exactly the same way. That is, with one of the hole diameters being measured, the value obtained by subtracting the sum of the radii of both holes, that is, the center-to-center distance, can be directly read using the sliding body 2.

In the above, one of the pins or holes was directly measured and used as a reference, but it is also possible to use the reference dimensions shown in drawings, specifications, etc., and a corresponding prosodic gauge.

Next, the case of determining the center distance between pins or holes of different diameters will be described. First, measure the diameters of both pins (or holes) using a caliper in a standard measurement state, add them, and calculate the value divided into two. The sliding body 2 is moved to the position of this obtained value and determined using the vernier scale 7. Then, the set screw 6 is tightened, the set screw 8 is loosened, the vernier scale 7 is moved and brought into contact with the reference collision surface 5, and the set screw 8 is tightened and fixed. The sum of the respective radii of both pin (or hole) diameters now becomes the zero scale. Therefore, by measuring both maximum outer dimensions in the same manner as described above, the center-to-center dimension can be directly read. Even in this case, alignment can be made accurate by using a block gauge or the like.

〔Effect of the invention〕

As explained above, the caliper of the present invention can of course be used as a conventionally known standard type, and when measuring the center distance of the same span, one diameter can be measured and the vernier can be set at the zero position. By fixing it, you can directly read the dimensions without making troublesome calculations, and it is also possible to read directly as a zero position even for different spans, so there is no need to convert the readings as in the past. The practical effect is great because no special equipment is required.

[Brief explanation of drawings]

Fig. 1 is a front view of one embodiment of the caliper of the present invention, and Fig. 2 is A-
A" cross section is shown. In the figure, 1 is the main scale, 2 is the sliding body, 3 and 3' are the fixed beak, and 4.
4' is a movable beak, 5 is a reference contact surface, 6.8 is a set screw, 7
is a vernier, 9 is a block, 10 is a tip, and 12.12'' is a pin.

Claims (1)

[Claims] Fixed beaks (3), (3') provided at the end of the main length (1)
a movable beak (4), (4') that can be guided by the main scale and move toward or away from the fixed beak; and a vernier that is fitted into the movable beak and is movable in the guiding direction and is provided with a fixing means. (7) and
A caliper characterized in that it has a reference contact surface (5) for positioning the vernier length end (10) in contact with the main length (1).