Caliper with extended measuring range

Abstract

Extending the measuring range of commonly used calipers. [Solution] As an example, let's explain using a caliper manufactured with a frame length of 300mm without any fractional parts. The dimension between the frame contact surface (7) and the slider contact surface (6) when d=0 is, for example, manufactured to a fractional 50mm and clearly marked on the right end of the slider. The measurer measures between (7) and (6), and adds the main scale dimension to 50mm to obtain the measurement value. The maximum measurement value between the jaws and the measurement method for the 300mm frame length are as follows: For measurement ranges exceeding 300mm, the measurement value is 300 + the extension of the depth bar (d), since the frame length is 300mm. The frame dimensions (300mm) and contact surface are clearly marked on the left end of the frame. When measuring internal dimensions such as the back of a cylinder, there is a gentle projection (4) with a height of (s) to prevent the jaws from getting in the way.

Description

[Technical Field]

[0001] The present invention relates to a technique for expanding the measurement range of commonly used standard vernier calipers. [Background Art]

[0002] Vernier calipers are used for length measurement, but the object to be measured may exceed the measurement range of the calipers. It is very troublesome when there is no compatible measuring instrument at hand in a work site or the like.

[0003] For use at work sites, vernier calipers with a larger measurement range are less troublesome, but excessively large calipers are also inconvenient. Accordingly, applications have been filed for techniques for extending the measurement range by extending the main scale (Document 1) (Document 2). There are also applications that extend the main scale by bending and stretching (Document 3). [Prior Art Documents] [Patent Documents]

[0004] [Patent Document 1] Jitsugan Sho 56-068105 [Patent Document 2] Japanese Unexamined Patent Application Publication No. 2006-112883 [Patent Document 3] Japanese Unexamined Patent Application Publication No. 2004-12314 [Summary of the Invention] [Problem to be Solved by the Invention]

[0005] An object of the present invention is to maximize the measurement range without significantly changing the shape of commonly used vernier calipers or adding extra components. [Means for Solving the Problem]

[0006] In a normal measurement range, measurement is performed between the jaws; however, in order to expand the measurable range beyond said measurement range up to the full length dimension of the frame, The slider is manufactured so that its right end extends slightly beyond the depth bar end of the frame. The upper end of the slider on the depth bar side serves as the slider contact surface, and the opposite contact surface is placed on the frame on the opposite depth bar side, along the extension of the movement of the slider contact surface. Measurements are taken on both sides. The method involves closing the jaws, setting the measurement dimension to 0mm, and clearly marking both the numerical value between the contact surfaces and the slider contact surface on the top of the slider. Then, by performing an internal measurement between the two contact surfaces and adding the main scale dimension to the numerical value between the contact surfaces, the measurement range can be extended from the jaws to the frame length. Making the numerical values ​​to be fractional makes calculations easier.

[0007] If the measurement exceeds the frame length, a gentle projection should be made on the left end of the frame on the side opposite the depth bar, with the center line of the depth bar as its apex. This projection will serve as the contact surface for the object being measured, and the opposite contact surface will be the tip of the depth bar. The distance between the two should be calculated by adding the total frame length and the length of the depth bar's extension. It is helpful to manufacture the frame with a total length that does not have fractions, and to clearly indicate this dimension near the gentle projection, along with the contact surface. [Effects of the Invention]

[0008] This caliper allows for internal measurements beyond the normal measuring range, up to the sum of the caliper's total length and the extension of the depth bar. It expands the measurement range to areas previously impossible with calipers, such as measuring the inner surface inside a cylinder. The gentle protrusions prevent the jaws from interfering when measuring internal dimensions. This design effectively expands the measurement range without significantly altering the caliper's shape. External measurements can also be taken by placing a support object on the outside of the object to be measured and measuring the inside. [Brief explanation of the drawing]

[0009] [Figure 1] This caliper has a standard shape commonly used and is manufactured with an overall length of 300mm. [Modes for carrying out the invention]

[0010] The following diagram, Figure 1, shows a partial embodiment of a caliper with a frame length of 300 mm. The frame (1) having a main scale is equipped with an outer jaw (9), an inner jaw (8), a slider (2), a depth bar (3), a slider contact surface (6), a frame contact surface (7) provided on the extension of the slider's movement, and a gentle projection on the center line of the depth bar at the left end of the frame, allowing the slider to move to a position equal to the height (s) of the depth bar side end of the frame plus the gentle projection. The normal measurement range is such that the longest measurement value between the jaws is (L). When measuring between (L) and 300mm, which exceeds the measuring range of the main scale, move the slider (2), close the jaws, and with the main scale dimension at 0mm, The dimension between (6) and (7) should be manufactured to a fractional value, and that value and the contact surface indication should be clearly marked on the upper right end of the slider. For example, if it is 50mm, the measurer can add the main scale dimension measured on both contact surfaces (6) and (7) and 50mm to obtain a measurement between (L) and 300mm.

[0011] If the measurement exceeds the frame dimension of 300 mm, a gentle projection (4) should be provided on the left end of the frame on the side opposite the depth bar, with the center line of the depth bar as its apex. The measurement should be taken between the contact surface of the projection and the tip (5) of the depth bar, and the frame dimension of 300 mm should be added to the main scale dimension of the depth bar's extension (d). It is best to manufacture the frame dimension to a value such as 300 mm without fractions for calculation purposes. The frame dimension and contact surface should be clearly indicated near the gentle projection (4). The gentle projection (4) is there to prevent the jaws from getting in the way when measuring the internal dimensions. Furthermore, by moving the contact surface (6) to the center line of the depth bar (3) and creating a projection (10) on the back side of the drawing, obtained by subtracting dimension s from the slider end, measurements can be taken between the gently sloping projection (4). The main scale is easily visible from the front. [Explanation of Symbols]

[0012] 1 Frame with a single length 2 Sliders 3 Depth Bars 4. Gentle protrusion (contact surface with 5) 5 Depth bar end (contact surface with 4) 6. The contact surface of the slider (the contact surface with 7) 7. Contact surface of frame (contact surface with 6) 8 Inner jaw 9 Outer jaw 10. Contact surface on the back of the slider (contact surface with 4)

Claims

1. A caliper for measuring between two points comprises a frame having a main scale, one of the outer jaws, and one of the inner jaws; a slider having the outer jaw, the other of the inner jaws, and a vernier scale; and a depth bar that extends from the end of the frame and measures depth by the extension dimension. The end of the frame opposite to the depth bar is designated as the initial contact surface for measurement, and the corresponding contact surface for measurement is designated as follows: The contact surface provided at the depth bar side end of the slider, The depth bar comprises a contact surface at the tip end, The function involves adding the dimension of the main scale obtained between the initial contact surface and the contact surface provided on the depth bar side end of the slider, and the dimension from the initial contact surface to the contact surface on the initial depth bar side end of the slider at the position of 0 mm in the main scale dimension of the slider, to obtain a measurement value between the two points, and also A caliper with an extended measuring range, characterized by a function that adds the main scale dimension between the initial contact surface and the contact surface at the tip of the depth bar, and the total length of the frame from the initial contact surface to the exit of the depth bar, to obtain a measurement value between two points.

2. In the aforementioned length measuring caliper, with the depth bar facing right and the external measuring jaws facing downward (hereafter, up and down, left and right descriptions will follow Figure 1), the caliper is equipped with the following measuring contact surfaces: a gentle projection 4 at the left end of the frame, having its apex on the left side of the center line of the depth bar; a depth bar contact surface 5 at the right end of the depth bar; a slider contact surface 6 at the upper right end of the slider on the depth bar side; and a frame contact surface 7 provided at the left end of the frame, on the extension of the trajectory of the sliding movement of the slider contact surface, and on the same line as the bottom of the gentle projection, facing away from the slider contact surface. The range in which normal length measurements are performed using the inner jaw or the outer jaw is defined as a single measurement range. The function to extend the measurement range beyond the first measurement range to the total length of the frame is: The right end of the slider is manufactured to be movable from the depth bar side end of the frame to a point where the height dimension s of the gentle projection is added to the frame contact surface. The slider is moved to the position where the main scale dimension is 0 mm, and the dimension from the frame contact surface 7 to the slider contact surface 6 is manufactured as a fractional value. This value is then clearly marked on the upper right end of the slider along with the contact surface indication. The frame contact surface 7 and the slider contact surface 6 are used as the measurement contact surfaces between two points, and the measurement is performed by adding the measured scale dimension and the numerical value. This range is defined as the second measurement range, and the function to extend the measurement range beyond this second range by adding the total frame length and the extension allowance of the depth bar is as follows: The caliper with an extended measuring range according to claim 1 is characterized by the ability to use the first, second, and third measuring ranges, with the distance from the gently sloping projection to the right end of the frame at the exit of the depth bar being manufactured to a fractional value and designated as the frame dimension, this dimension being clearly indicated as the frame dimension near the gently sloping projection along with the indication of the contact surface, the contact surface 4 of the gently sloping projection and the contact surface 5 of the depth bar being measured as the measuring contact surfaces, the frame dimension and the main scale dimension of the depth bar extension being added together to perform the measurement, this range being designated as the third measuring range, and the range being characterized by the ability to use the first, second, and third measuring ranges.

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