JP2018077203A - Inner angle measuring tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inner angle measuring tool that is caused to reach a prescribed angle in a short time even when measuring inner angles of greatly different other holes, and can measure the highly accurate inner angle.SOLUTION: An inner angle measuring tool 1 comprises: a cylindrical support main body 2 that has a plurality of windows 2a extending in a shaft direction formed in a tip end side lateral face, and is formed so as to advance and retract a spindle 5 inserted into an inner hole in the shaft direction; and a plurality of measuring pieces 3 that is fluctuated with a fulcrum part 4 provided on a tip end side inside the support main body as a fulcrum. The measuring piece has: an outside face 3a that projects from the window; and a fluctuation face 3b that abuts on a tip end of the spindle. An opening angle formed by the outside face of the plurality of measuring pieces projected from the window is variably adjusted by advancement/retraction actions of the spindle. In the support main body, a guide-purpose slit 2b is provided. A movement body in which a base end is fixed to the spindle and the tip end is projected outward the support main body is inserted into the guide-purpose slit, and in conjunction with a movement of the movement body, the spindle is changed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an internal angle measuring tool for measuring an internal angle formed in a material during various operations in a production process.

  Among various types of processing in the production process, there are cases where a tapered hole having a smaller diameter is formed as it becomes deeper from the surface of the material. In addition, the internal angle of a tapered hole formed in advance may be measured. When measuring the internal angle of such a tapered hole, an internal angle measuring gauge is generally used.

  As this internal angle measurement gauge, Utility Model Registration No. 3193096 (Patent Document 1) forms three special steel plates into isosceles triangles and shows them on a one-side indicator wire plate using the second chord law. An internal angle measuring gauge for measuring the internal angle by the numerical value is shown. Japanese Patent Laid-Open No. 2006-125915 (Patent Document 2) describes an angle when four strips each having a protractor formed on one side are formed into a quadrangular shape and the four strips are formed into a parallelogram. An internal angle measuring device is shown in which is read by a protractor. As described above, measuring instruments that measure the internal angle using the function of the protractor are disclosed in Japanese Patent Application Laid-Open No. 2006-112798 (Patent Document 3), Utility Model Registration No. 3172187 (Patent Document 4), Utility Model Registration No. 3172186. No. 3 (patent document 5) and utility model registration No. 3172185 (patent document 6).

Utility Model Registration No. 3193096 JP 2006-125915 A JP 2006-112798 A Utility Model Registration No. 3172187 Utility Model Registration No. 3172186 Utility Model Registration No. 3172185

  The internal angle measuring device disclosed in the above-mentioned patent document measures the internal angle by reading the scale formed on one side of the triangle and the scale formed on the protractor. However, in the normal case, the scale attached to the ruler or the protractor is about 1 to 2 degrees, so an accurate internal angle cannot be measured. Further, since a plurality of strips are rotatably connected to a triangle or a quadrangle, there is a problem of synergistic deterioration of synergies because the backlash at a connection point reaches a plurality of locations.

  On the other hand, an internal angle measuring tool for measuring a highly accurate internal angle using a micrometer has also been proposed. However, after measuring the internal angle of a tapered hole, if you try to measure an internal angle that is significantly different, you will reach the internal angle of the hole you want to measure unless you rotate the thimble of the micrometer many times. I can't. For this reason, there is a problem in that the measurement time is significantly increased and inconvenience is given to the user.

  The problem to be solved by the present invention is an internal angle that can reach a predetermined angle in a short time and measure a highly accurate internal angle even when measuring the internal angle of another hole that differs greatly. To provide a measuring tool.

  Therefore, an internal angle measuring tool according to the present invention has a cylindrical support main body formed with a plurality of windows extending in the axial direction on the side surface on the front end side, and formed so as to advance and retract the spindle inserted through the inner hole in the axial direction, A plurality of measuring pieces swinging around a fulcrum provided on the tip side inside the support body, the measuring piece being an outer surface protruding from the window and a sliding surface contacting the tip of the spindle And the opening angle of the plurality of measuring pieces projecting from the window is variably adjusted by the forward and backward movement of the spindle, and a guide slit extending in the axial direction is formed in the support body. The slit has a base end fixed to the spindle and a moving body whose tip protrudes outward from the support body is inserted, and the spindle is changed in conjunction with the movement of the moving body. It is a fact.

  In addition, the internal angle measuring tool includes a display unit that detects and digitally displays a displacement amount corresponding to the displacement of the moving body whose base end is fixed to the spindle, and the displacement amount of the moving body is proportional to the opening angle operation of the measuring piece. The display unit displays the opening angle of the measurement piece.

  Further, in the inner angle measuring tool, a display unit for digital display is provided on the distal end side of the moving body, and a main scale is formed on the outer periphery of the support body, and a scale for displaying the opening angle of the measurement piece is provided. Detection means for detecting a displacement amount with respect to the main scale may be provided, and an open angle corresponding to the display of the main scale may be digitally displayed on the display unit.

  Furthermore, in the inner angle measuring tool, a probe of a digimatic indicator is connected to a spindle that advances and retreats in the axial direction at the rear end of the cylindrical support body opposite to the plurality of measurement pieces provided at the tip, You may make it display the opening angle of the said measurement piece on the said digimatic indicator digital corresponding to the displacement amount of the said spindle corresponding to movement operation of the moving body protruded from the slit for guides formed in the said support body.

  According to the present invention, since the guide slit is formed in the support body of the inner angle measuring tool, the moving body having the base end fixed to the spindle is inserted, and the distal end protrudes outward from the support body. The spindle can be moved by advancing and retracting. As a result, it is possible to quickly variably adjust the opening angle of a plurality of measuring pieces in contact with the spindle, so that even when measuring the internal angle of other holes that are greatly different, the predetermined angle can be reached in a short time. A highly accurate internal angle can be measured.

  In addition, since the displacement of the moving body is proportional to the opening angle operation of the measurement piece and the displacement is detected and digitally displayed, the display unit displays the opening angle of the measurement piece. The angle can be measured.

  In addition, a display unit for digital display is provided on the distal end side of the moving body, and a main scale having a scale for displaying the opening angle of the measuring piece is provided on the outer periphery of the support body, and the displacement amount relative to this main scale is detected and displayed. Since the display is digitally displayed, the opening angle of the measurement piece can be clearly read by the display unit.

  Furthermore, by connecting a dimming indicator probe to the spindle that advances and retreats in the axial direction, and displaying the displacement of the spindle corresponding to the moving operation of the moving object digitally, the opening angle of the measuring piece is clearly indicated by the digimatic indicator. It becomes possible to read.

It is a perspective view which shows the internal angle measuring tool by this invention. FIG. 2 is a partial cross-sectional view of the inner angle measuring tool shown in FIG. 1. It is explanatory drawing which shows the state which measures the angle of 60 degrees with an internal angle measuring tool. It is explanatory drawing which shows operation | movement of the measurement piece of an internal angle measuring tool. It is explanatory drawing which shows the state which measures the angle of 20 degrees with an internal angle measuring tool. It is a top view which shows the measurement piece which changed the angle of the outer surface. It is a perspective view which shows the internal angle measuring tool which uses a digimatic indicator. It is sectional drawing which shows the Example which made the measurement piece of the inner angle measuring tool three.

  An internal angle measuring tool according to the present invention includes a cylindrical support body formed with a plurality of windows extending in the axial direction on the side surface on the front end side and formed so as to advance and retract the spindle inserted through the inner hole in the axial direction, and the support body A plurality of measurement pieces that swing around a fulcrum portion provided on the front end side of the inside, and the measurement piece has an outer surface that protrudes from the window and a sliding surface that contacts the front end of the spindle. The opening angles of the outer surfaces of the plurality of measuring pieces protruding from the window are variably adjusted by the advance / retreat operation of the spindle, and a guide slit extending in the axial direction is formed in the support body, and the guide slit is formed in the guide slit. Is configured to insert a moving body whose base end is fixed to the spindle and whose front end protrudes outward from the support body, and to change the spindle in conjunction with the movement of the moving body. There.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an embodiment of an internal angle measuring tool according to the present invention. The inner angle measuring tool 1 includes a cylindrical support body 2, a pair of measuring pieces 3, and a moving body 4.

  The support body 2 is formed in a cylindrical shape and has an inner diameter that allows the spindle 5 to move forward and backward. Further, a pair of left and right windows 2 a extending in the axial direction are formed at positions opposed to each other by 180 ° from the distal end side to the proximal end side of the support body 2. A guide slit 2 b extending in the axial direction is formed on the lower side of the support body 2. The moving body 4 is movably inserted into the guide slit 2b. The movable body 4 has a proximal end fixed to the spindle 5 and a distal end protruding outward from the support body 2. A display unit 6 to be described later is provided at the tip of the moving body 4, and a main scale 8 is disposed on the peripheral surface of the support body 2 corresponding to the display unit 6.

  From the pair of left and right windows 2 a of the support body 2, a pair of measuring pieces 3 that swings symmetrically are projected. As shown in FIGS. 2 and 4, the measuring piece 3 swings symmetrically with the fulcrum portion 4 provided on the tip side inside the support body 2 at the upper end side. And the outer side surface 3a which protrudes from the window 2a of the measurement piece 3 is formed in linear form. On the other hand, the sliding surface 3b opposite to the outer surface 3a is formed in a curved shape and is brought into contact with the tip of the spindle 5. The pair of measurement pieces 3 is hung with the tip of a spring 7, and the spring 7 is pressed lightly so that the pair of measurement pieces 3 are always in contact with the tip of the spindle 1d. By moving the spindle 5 back and forth, as shown in FIG. 6, the opening angle of the pair of measuring pieces 3 can be set or measured at a wide angle, for example, 20 ° to 100 °.

  The curved surface formed on the sliding surface 3b of the pair of measuring pieces 3 is a curve in which the moving distance of the spindle 5 and the opening angle of the measuring piece 3 change in direct proportion. Although the sliding surface 3b of the measuring piece 3 may be formed in a straight line, in this case, since the opening angle of the measuring piece 3 and the moving distance of the spindle 5 are in a logarithmic relationship, the measurement by the display unit 6 is performed. Even if becomes a logarithm, it is necessary to correct the display so that the display has a directly proportional relationship.

  On the other hand, the configuration of the display unit 6 and the main scale 8 described above can employ the configuration of a known digital display type measuring instrument. Although detailed description is omitted, the main scale 8 is provided with an electromagnetic induction type scale along the longitudinal direction, and the display unit 6 is provided with a detection head for detecting the amount of displacement with respect to the main scale 8. . When the spindle 2 is moved by the moving operation of the moving body 4, the detection head reads the electromagnetic induction scale of the main scale 8 and digitally displays the opening angle of the measuring piece 3 on the display unit 6. ing.

  Next, an angle measuring method using the inner angle measuring tool according to the present invention will be described. For example, as shown in FIG. 3, the material 9 is formed with a tapered hole 9a having a smaller diameter as it becomes deeper from the surface. First, a pair of measuring pieces 3 protruding left and right symmetrically from a pair of left and right windows 2a of the support body 2 is inserted from the opening side of the tapered hole 9a. If the taper angle of the hole 9a is 60 °, as shown in FIG. 3, the movable body 4 or the display unit 6 is moved until the outer side surface 3a formed in a linear shape of the measuring piece 3 is joined to the inner surface of the hole 9a. . And when the outer side surface 3a of a pair of measurement piece 3 joins to the inner surface of the hole 9a, the digital display of the display part 6 is read. At this time, when the digital display is displayed as 60.00, it indicates that the taper angle of the hole 9a is accurately formed at 60 °. However, when there is an error in the taper angle, for example, 60 · 57 °, when the moving body 4 is moved and the outer surface 3a of the pair of measuring pieces 3 is joined to the inner surface of the hole 9a, the display unit 6 60.57 is digitally displayed.

  Thus, when measuring the inner angle of the tapered hole 9a, the angle of the measurement piece 3 is changed by simply moving the movable body 4 or the display unit 6 with the pair of measurement pieces 3 inserted. Since it can be changed, the inner angle can be measured in a short time. At this time, the detection head provided in the display unit 6 is accurately measured by reading the main scale 8 electromagnetic induction scale.

  On the other hand, when the tapered hole 9a described above is machined to an angle of 20 °, for example, as shown in FIG. 5, the opening angle of the pair of measurement pieces 3 is reduced by moving the movable body 4 or the display unit 6. After that, a pair of measurement pieces 3 is inserted. Then, as described above, the angle of the tapered hole 9a is shown by finely adjusting the moving body 4 so that the linearly formed outer surface 3a of the measuring piece 3 is joined to the inner surface of the hole 9a. As shown, the display unit 6 digitally displays 20.00 °.

  FIG. 7 shows another embodiment of the internal angle measuring tool according to the present invention, which uses a dimatic indicator 10 as a display unit. Digimatic indicator 10 is a measuring tool that measures a dimension such as thickness and depth by bringing a measuring element into contact with an object to be measured. As is well known, the tip of spindle 12 derived from display unit 11 is known. The measuring element 13 is provided on the display unit 11, and dimensions corresponding to the advancement and retraction of the measuring element 13 and the spindle 12 are digitally displayed on the display unit 11.

  A stem 14 is disposed on the display portion 11 of the digimatic indicator 10, and the digimatic indicator 10 is attached to the rear end of the support body 2 by the stem 14. The support body 2 is formed in a cylindrical shape, and has an inner diameter that allows the probe 13 and the spindle 12 to move back and forth. The measuring element 13 is in contact with the rear end of the spindle 5 shown in the above-described embodiment.

  On the other hand, the support body 2 is formed in a cylindrical shape as in the above-described embodiment, and the spindle 5 is inserted therein so as to be able to advance and retract. Further, a pair of left and right windows 2a extending in the axial direction are formed on the distal end side of the support body 2, and the pair of measuring pieces 3 is protruded from the windows 2a so as to be swingable, as in the above-described embodiment. It is. The support body 2 is formed with a guide slit 2b extending in the axial direction. A movable body 15 is movably inserted into the guide slit 2b. A base end of the movable body 15 is fixed to the spindle 5 and a distal end. Protrudes outward from the support body 2. In the embodiment shown in FIG. 7, the moving body 15 is formed in a ring shape and is movably inserted through the outer periphery of the support body 2. Then, by moving the moving body 15 in the axial direction of the support main body 2, the spindle 5 moves integrally to swing the pair of measuring pieces 3 in the same manner as in the above-described embodiment.

  As shown in FIG. 7, even in the internal angle measuring tool using the digimatic indicator 10 as the display unit, when measuring the internal angle of the tapered hole 9a, the display unit moves with the pair of measuring pieces 3 inserted. The angle of the measuring piece 3 can be changed by simply moving the body 15. That is, a pair of measuring pieces 3 protruding left and right symmetrically from a pair of left and right windows 2a of the support body 2 is inserted from the opening side of the tapered hole 9a. If the taper angle of the hole 9a is 60 °, the moving body 15 is moved until the outer side surface 3a formed in a linear shape of the measuring piece 3 is joined to the inner surface of the hole 9a. And the digital display displayed on the display part of the digimatic indicator 10 when the outer side surface 3a of a pair of measurement piece 3 joined to the inner surface of the hole 9a is read. At this time, similarly to the above-described embodiment, when 60 · 57 ° is displayed on the display unit, it indicates that the taper angle of the hole 9a has a processing error with respect to the target of 60 °.

  FIG. 8 shows an example in which three measuring pieces are used in the internal angle measuring tool according to the present invention. The cylindrical support body 20 is formed with three windows 20a extending in the axial direction from the distal end side toward the proximal end side at an equiangular position of 120 °.

  From the three windows 20a of the support body 20, three measuring pieces 21 that swing in the radial direction are projected. These measurement pieces 21 swing according to the advancing / retreating operation of the spindle 12 described above, with the fulcrum portion 22 provided at the upper end side at an equal angle of 120 ° on the front end side inside the support body 20. The opening angle due to is changed. As shown in FIG. 8, the fulcrum part 22 is provided with linear pins arranged at an equal angle of 120 °, and both end parts are fixed to the front end side of the support body 20. The three fulcrum portions 22 are pressed so as not to be separated upward by a lid (not shown) fitted into the opening of the support body 20.

  Next, an angle measuring method of the inner angle measuring tool of the present invention having three measuring pieces 21 shown in FIG. 8 will be described. First, in a state where the opening angles of the three measuring pieces 21 are made small, they are inserted into the tapered holes 9a formed in the material 9 in the same manner as in the above-described embodiment. Thereafter, the moving body or the display unit 11 is moved, and all of the outer side surfaces 11a formed in a linear shape of the measuring piece 11 are joined to the inner surface of the hole 9a. As described above, the opening angle of the hole 9a can be accurately measured by reading the digital display displayed on the display unit in a state where the measurement piece 11 is joined to the inner surface of the hole 9a.

  Thus, by setting the three measurement pieces 21 to three, when the three measurement pieces 11 are inserted into the hole 9a to be measured, the three measurement pieces 11 are equally holed from the principle of three-point support. It can be joined to the inner surface of 9a. For this reason, it becomes possible to accurately measure the inner angle of the hole 9a. Incidentally, even when the inner angle measuring tool is inserted in an inclined state with respect to the axial center of the hole 9a, the three measuring pieces 11 are inserted while being joined along the inner surface of the hole 9a. The internal angle can be easily measured as compared with the embodiment described above.

  Although the present invention has been specifically described above based on the embodiments, it is needless to say that the present invention is not limited to the above embodiments and can be variously modified without departing from the gist thereof. In the embodiment described above, the outer surface of the measuring piece is formed in a straight line, but a protrusion may be formed in a part, and the angle of the taper hole of the material may be measured by the opening angle at the apex of the protrusion. Further, although two or three measuring pieces are projected from the window of the support body, a plurality of measuring pieces such as four or five may be projected. Furthermore, when the inner diameter of the tapered hole formed in the material is large, an extension aid is provided on the outer side surface of the measuring piece that is formed in a straight line so as to increase the diameter of the virtual circle formed by the outer side surface of the measuring piece. Anyway.

DESCRIPTION OF SYMBOLS 1 Internal angle measuring tool 2 Support body 2a Window 2b Guide slit 3 Measuring piece 3a Outer side surface 3b Sliding surface 4 Moving body 5 Spindle 6 Display part 8 Main scale 9 Material 9a Hole 10 Digimatic indicator 13 Measuring element 15 Moving body

Claims (4)

A cylindrical support body formed with a plurality of windows extending in the axial direction on the side surface on the front end side so as to advance and retract the spindle inserted through the inner hole in the axial direction, and a fulcrum provided on the front end side inside the support body A plurality of measuring pieces that swing around the portion as a fulcrum,
The measuring piece has an outer surface protruding from the window and a sliding surface that comes into contact with the tip of the spindle, and an opening angle of the outer surfaces of the plurality of measuring pieces protruded from the window is set to advance and retract the spindle. An internal angle measuring tool that is variably adjusted by
A guide slit extending in the axial direction is formed in the support body,
In the guide slit, a moving body having a proximal end fixed to the spindle and a distal end protruding outward of the support body is inserted,
An internal angle measuring tool that displaces the spindle in conjunction with the movement of the moving body.   A display unit that detects and digitally displays a displacement amount corresponding to the displacement of the moving body whose base end is fixed to the spindle, and makes the displacement amount of the moving body and the opening angle operation of the measuring piece proportional to each other. The internal angle measuring tool according to claim 1, wherein an opening angle of the measuring piece is displayed.   A display unit for digital display is arranged on the front end side of the moving body, and a main scale with a scale for displaying the opening angle of the measuring piece is provided on the outer periphery of the support body, and the displacement relative to the main scale is detected on the display section. 3. The internal angle measuring tool according to claim 1, further comprising a detection unit configured to digitally display an open angle corresponding to the display of the main scale on the display unit.   At the rear end of the cylindrical support body opposite to the plurality of measuring pieces provided at the front end, a probe for a digimatic indicator is connected to a spindle that advances and retracts in the axial direction, and a guide slit formed in the support body The internal angle measuring tool according to claim 1 or 2, wherein an opening angle of the measuring piece is displayed on the digital indicator digital corresponding to a displacement amount of the spindle corresponding to a moving operation of the moving body projected from the head.

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