JPWO2005012829A1 - Angle measuring instrument - Google Patents

Abstract

In the angle measuring device (11), the second arm (17) is connected to the first arm (12) so as to be relatively rotatable about the support shaft (16). The relative angles of the first and second arms (12, 17) are read on an angle scale. The pointer (21) rotates about a rotation axis coaxial with the support shaft (16). The direction of gravity is specified based on the pointer (21). For example, when measuring the angle of the upper arm and the forearm, the first and second arms (12, 15) are applied to the upper arm and the forearm. The upper arm and forearm angles are read. At the same time, the measurer can derive the inclination angle of the upper arm or the forearm with respect to the gravity direction, that is, the vertical direction based on the observation of the pointer. In measuring the relative angles of the upper arm and the forearm, the relative relationship between the entire human body and the upper arm or the forearm is further defined. In this way, the degree of recovery of the treatment subject can be determined quantitatively and finely in the field of rehabilitation.

Description

  The present invention relates to an angle measuring instrument used for measuring an angle around a joint of a human body, for example.

  For example, in the field of rehabilitation, the relative angle between the upper arm and the forearm is measured. A so-called angle measuring instrument is widely used for such measurement. The angle measuring device includes first and second arms. The second arm is attached to the first arm so as to be relatively rotatable around a support shaft fixed to the first arm. A scale plate is fixed to the first arm. On the dial, the rotation angle is displayed around the spindle. When the second arm rotates relative to the first arm, the rotation angle can be read on the dial.

According to the conventional angle measuring device, the relative angle between the upper arm and the forearm can be measured relatively easily. However, in such measurement, for example, the relative relationship between the trunk and the upper arm is not considered at all. If the relative relationship between the entire human body and the upper arm is further defined in the measurement of the relative angle between the upper arm and the forearm, the degree of recovery of the treatment subject can be determined quantitatively and finely in the field of rehabilitation, for example.
Japanese Patent No. 2681499

  The present invention has been made in view of the above circumstances, and an object thereof is to provide an angle measuring instrument that can greatly contribute to quantification of human body measurement.

  In order to achieve the above object, according to the first invention, the first arm, the second arm connected to the first arm so as to be relatively rotatable around the support shaft, and the movable range of at least the first and second arms. An angle measuring instrument is provided, comprising: an angle scale for displaying a rotation angle around the support shaft; and an inclination angle meter for specifying a gravitational direction with respect to at least the first arm.

  Such an angle measuring device can be used for measuring the angle of the upper arm and the forearm, for example. At this time, the relative angle between the first and second arms can be simply read on an angle scale. In addition, the measurer can derive the inclination angle of the upper arm or the forearm with respect to the direction of gravity, that is, the vertical direction based on the inclination angle meter. As a result of the inclination angle being related to the relative angle between the upper arm and the forearm, the relative relationship between the entire human body and the upper arm or the forearm is further defined in measuring the relative angle between the upper arm and the forearm. Thus, for example, in the field of rehabilitation, the degree of recovery of the treatment subject can be determined quantitatively and finely. For example, the tilt angle meter may be provided with a pointer that rotates around a rotation axis coaxial with the support shaft and identifies the direction of gravity. In addition, the tilt angle meter may specify the direction of gravity based on a strain gauge.

  In this angle measuring device, the angle scale may be rotated relative to the support shaft. Based on such relative rotation, the angle scale can be read more accurately. Angular misreading can be avoided.

  Such an angle measuring device includes an extension arm extending on the extension line of the first arm, a first measurement arm attached to the first arm and extending in parallel to the support shaft, and attached to the extension arm. And a second measurement arm extending in parallel with the second measurement arm.

  Such an angle measuring device can be used, for example, in measuring the inclination angle of the pelvis. At this time, the distal ends of the first and second measurement arms are pressed against the left and right upper anterior iliac spines, respectively. The tilt angle of the pelvis can be measured based on the angle scale indicated by the pointer.

  In general, in the human body, an abdominal bulge is observed between upper anterior iliac spines. According to this angle measuring device, since the first and second measuring arms protrude from the first arm and the extension arm, the inclination angle of the pelvis is reliably reflected in the inclinations of the first arm and the extension arm. Therefore, the inclination angle of the pelvis can be accurately measured. If the first and second measurement arms are omitted, the first arm and the extension arm are lifted from the human body due to the protrusion of the abdomen. A large space is formed between the first arm or extension arm and the superior anterior iliac spine. The inclination angles of the first arm and the extension arm cannot sufficiently reflect the inclination angle of the pelvis.

  It is desirable that the first measuring arm translates along the first arm. When the parallel movement of the first measurement arm is realized in this way, the distance between the first and second measurement arms can be adjusted. The distance between the first and second measurement arms can be adjusted to the distance between the left and right upper anterior iliac spines. Thus, the first and second measuring arms can be accurately aligned with the superior anterior iliac spine. Similarly, the second measurement arm may be translated along the extension arm.

  The first measurement arm may change its posture between a first posture extending parallel to the support shaft and a second posture extending along one plane orthogonal to the support shaft. Similarly, the second measurement arm may change its posture between a first posture that extends parallel to the support shaft and a second posture that extends along one plane perpendicular to the support shaft. Such an angle measuring device can be used, for example, in measuring the inclination angle of the spine. At this time, the tips of the first and second measurement arms may be pressed against the chest and abdomen, respectively.

  The angle measuring device may further be provided with a temporary fixing member that temporarily fixes the pointer in a stationary manner around the rotation axis. Thus, if the pointer is temporarily fixed during observation of the pointer, the specification of the vertical direction can be realized with high accuracy.

  It is desirable for the angle scale to display the angle at a predetermined interval over 360 degrees around the support shaft. In this way, the rotation position of the angle scale can be set based on various criteria. The versatility of the angle measuring device can be further enhanced.

  According to the second invention, the first arm, the first measurement arm attached to the first arm, the extension arm extending on the extension line of the first arm, the second measurement arm attached to the extension arm, and the predetermined An angle measuring instrument is provided that includes a pointer that rotates around the rotation axis of the rotation axis and identifies the direction of gravity, and an angle scale that displays a rotation angle around the rotation axis. Here, the first measurement arm can change its posture between a measurement posture orthogonal to the first arm and a retracted posture extending parallel to the first arm. Similarly, the posture of the second measurement arm can be changed between a measurement posture orthogonal to the second arm and a retracted posture extending parallel to the second arm.

  Such an angle measuring device can be used, for example, in measuring the inclination angle of the pelvis. In the measurement, the first and second measurement arms are positioned in the measurement posture. Thus, the tips of the first and second measurement arms can be pressed against the left and right upper anterior iliac spines, respectively. The tilt angle of the pelvis can be measured based on the angle scale indicated by the pointer. Moreover, since the first and second measurement arms protrude from the first arm and the extension arm as described above, the inclination angle of the pelvis is reliably reflected in the inclinations of the first arm and the extension arm. Therefore, the inclination angle of the pelvis can be accurately measured. If the first and second measurement arms are positioned in the retracted posture, the protrusion of the first and second measurement arms can be suppressed. The angle measuring device can be stored compactly.

It is a perspective view showing roughly the whole angle measuring instrument composition concerning a 1st embodiment of the present invention. FIG. 2 is a vertical sectional view taken along line 2-2 of FIG. FIG. 3 is an enlarged vertical sectional view taken along line 3-3 in FIG. 2. It is a disassembled perspective view of an angle measuring device. It is a front view of the angle measuring device used in measuring the inclination angle of the pelvis. It is a front view of the angle measuring device used in measuring the angle of the upper arm and the forearm. It is a perspective view which shows roughly the whole structure of the angle measuring device which concerns on 2nd Embodiment of this invention. FIG. 3 is a vertical sectional view corresponding to FIG. 2. It is a front view of the angle measuring device used in measuring the inclination angle of a spine. It is an enlarged vertical sectional view showing the structure of the tilt angle meter.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 shows an appearance of an angle measuring instrument 11 according to the first embodiment of the present invention. The angle measuring device 11 includes a first arm, that is, a first fixed arm 12. A pendulum tilt angle meter 13 is fixed to one end of the first fixed arm 12. The tilt angle meter 13 is incorporated in a support 14 that is formed integrally with the first fixed arm 12. An extension arm that extends on the extension line of the first fixed arm 12, that is, the second fixed arm 15 is fixed to the support body 14. The second fixed arm 15 may be formed integrally with the support 14.

  A support shaft 16 is attached to the tilt angle meter 13. A second arm, that is, a rotation bar 17 is attached to the support shaft 16 so as to be rotatable about the support shaft 16. The rotating bar 17 may be formed from a permeable resin plate, for example. A straight line 18 extending from the axis of the support shaft 16 is drawn on the surface of the rotating bar 17. For example, the rotary bar 17 is connected to the support shaft 16 based on a screw that is screwed along the axis of the support shaft 16 from the tip of the support shaft 16.

  An angle scale 19 is attached to the surface of the tilt angle meter 13. On the angle scale 19, angles are displayed at predetermined intervals around the support shaft 16 over 360 degrees. Here, the scale is engraved every 10 degrees of the central angle.

  The tilt angle meter 13 includes a pointer 21 that rotates about a rotation axis coaxial with the support shaft 16, that is, a pendulum needle. The pointer 21 includes a weight (not shown) and a collar 21a. The rotation axis is arranged on a straight line connecting the tip of the flange 21a and the center of gravity of the weight. Therefore, when gravity acts on the weight, the tip of the flange 21a points directly above in the vertical direction.

  For example, arrow marks 22 are attached to the support 14 at intervals of a central angle of 90 degrees around the support shaft 16. When the first and second fixed arms 12 and 15 are maintained in the horizontal posture, the tip of the flange 21a points to the one arrow display 22. An arrow display 22 adjacent to the arrow display 22 thus pointed indicates the horizontal direction.

  A first measuring arm, that is, a first rotating slide arm 23 is attached to the first fixed arm 12. The first rotary slide arm 23 can maintain a posture parallel to the support shaft 16. The first rotary slide arm 23 can be translated on the first fixed arm 12. At the same time, the first rotary slide arm 23 can move back and forth in the longitudinal direction parallel to the support shaft 16. Similarly, a second measuring arm, that is, a second rotating slide arm 24 is attached to the second fixed arm 15. The second rotary slide arm 24 can maintain a posture parallel to the support shaft 16. The second rotary slide arm 24 can translate on the second fixed arm 15. At the same time, the second rotary slide arm 24 can move back and forth in the longitudinal direction parallel to the support shaft 16.

  The parallel movement of the first rotary slide arm 23 is guided by an opening 26 formed in the first fixed arm 12. The opening 26 partitions, for example, a rectangular parallelepiped space. This rectangular parallelepiped space is represented by the outer shape of the first rotary slide arm 23. Similarly, the parallel movement of the second rotary slide arm 24 is guided by an opening 27 formed in the second fixed arm 15. The opening 27 partitions, for example, a rectangular parallelepiped space. This rectangular parallelepiped space is represented by the outer shape of the second rotary slide arm 24.

  As apparent from FIG. 2, a slider 28 is incorporated in the first rotary slide arm 23. The slider 28 can move back and forth along a path 29 extending in the longitudinal direction in the first rotary slide arm 23. The slider 28 is formed with a pair of upper and lower guide shafts 31, 31 extending in the vertical direction. The shaft centers of the guide shafts 31 are arranged on the same straight line. The guide shafts 31, 31 protrude from elongated holes 32, 32 that extend parallel to the path 29 of the slider 28. When the slider 28 moves back and forth within the first rotary slide arm 23, the guide shafts 31 and 31 move back and forth along the long holes 32 and 32. When the movement of the guide shafts 31, 31 is restrained by the first fixed arm 12, the first rotary slide arm 23 can move relative to the first fixed arm 12. Similarly, a slider 28 is incorporated in the second rotary slide arm 24.

  A pair of long grooves 33, 33 extending in the longitudinal direction of the first fixed arm 12 is formed inside the opening 26. The long grooves 33 and 33 may be formed on the inner wall surfaces facing each other. A corresponding guide shaft 31 is received in each of the long grooves 33. As described above, when the posture of the first rotary slide arm 23 is set parallel to the support shaft 16, the first rotary slide arm 23 is fixed to the first fixed position by the action of the guide shafts 31, 31 guided by the long grooves 33, 33. It can be translated on the arm 12. In addition, the first rotary slide arm 23 can rotate relative to the first fixed arm 12 about an arbitrary vertical axis. Similarly, a long groove 33 is formed in the second fixed arm 15.

  In the first rotary slide arm 23 and the second rotary slide arm 24, a screw member 34 is screwed into the slider 28. The axis of the screw member 34 may extend in parallel to the axis of the guide shaft 31. As apparent from FIG. 3, the threaded portion or shaft portion of the screw member 34 is received in the elongated hole 32. Therefore, when the screw member 34 is screwed, a frictional force is generated between the screw head of the screw member 34 and the first rotary slide arm 23. The movement of the slider 28 is restrained with respect to the first rotary slide arm 23 by the action of the frictional force. The longitudinal movement of the first rotary slide arm 23 is prevented along the longitudinal direction.

  As shown in FIG. 4, the first and second fixed arms 12, 15 and the support 14 are composed of first and second halves 36a, 36b that are coupled to each other. The aforementioned long groove 33 may be formed based on the coupling of the first and second halves 36a and 36b. Similarly, a circular recess 37 for receiving the tilt angle meter 13 is formed in the first half 36a. The second half 36 b covers the inclination angle meter 13 accommodated in the depression 37. Thus, the tilt angle meter 13 is sandwiched between the first and second halves 36a and 36b. The tilt angle meter 13 can rotate around the rotation axis of the pointer 21 in the support 14. When the tilt angle meter 13 rotates about the rotation axis of the pointer 21, the angle scale 19 rotates similarly around the axis of the support shaft 16. At this time, in the pointer 21, the tip of the flange 21a continues to point directly above the vertical direction. In addition, as apparent from FIG. 4, when the first rotary slide arm 23 rotates relative to the first fixed arm 12 around an arbitrary vertical axis, the first rotary slide arm 23 opens the opening of the first fixed arm 12. 26 can be accommodated. In such accommodation, the first rotary slide arm 23 may rotate relative to the first fixed arm 12 around the guide shaft 31. The screw member 34 may be temporarily removed. Similarly, the second rotary slide arm 24 can be received in the opening 27 of the second fixed arm 15.

  Now, suppose a scene where the pelvic inclination of the human body is measured. For example, as shown in FIG. 1, the first and second rotary slide arms 23 and 24 are maintained in a posture parallel to the support shaft 16. At the same time, “90” degrees and “270” degrees of the angle scale 19 are aligned with the arrow display 22 adjacent to the first and second fixed arms 12, 15. As a result, the horizontal posture of the first and second fixed arms 12 and 15 can be established when the hook 21a of the pointer 21 is adjusted to “0” degree or “180” degree of the angle scale 19.

  As shown in FIG. 5, the measurer assigns the distal ends of the first and second rotary slide arms 23 and 24 to the left and right upper anterior iliac spines of the measurement subject, respectively. Based on the parallel movement of the first and second rotary slide arms 23, 24, the distance between the tips of the first and second rotary slide arms 23, 24 is adjusted to the distance between the superior anterior iliac spines. At this time, the horizontal posture of the first and second rotary slide arms 23 and 24 is maintained. The inclination angle of the pelvis can be measured based on the angle indication indicated by the heel 21a of the pointer 21.

  In general, in the human body, an abdominal bulge is observed between upper anterior iliac spines. According to the angle measuring device 11, the first and second fixed slide arms 23, 24 protrude from the first and second fixed arms 12, 15, so that the inclination angle of the pelvis is surely the first and second fixed arms 12. , 15 is reflected in the inclination. Therefore, the inclination angle of the pelvis can be accurately measured. If the first and second rotating slide arms 23 and 24 are omitted, the first fixed arm 12 and the second fixed arm 15 are lifted from the human body due to the abdominal protrusion. A large space is formed between the first fixed arm 12 and the second fixed arm 15 and the superior anterior iliac spine. The inclination angles of the first and second fixed arms 12 and 15 cannot sufficiently reflect the inclination angle of the pelvis.

  Next, it is assumed that a human body measures the upper arm and forearm angles. The first and second rotating slide arms 23 and 24 are stored in the first and second fixed arms 12 and 15 based on translation and rotation. The “0” degree of the angle scale 19 is adjusted to the arrow display 22 adjacent to the first fixed arm 12. Thereafter, for example, as shown in FIG. 6, the measurer applies the first fixed arm 12 to the upper arm 38 of the human body, for example. At this time, the support shaft 16 is positioned between the upper arm 38 and the forearm 39 at the pivot center of the joint.

  Subsequently, the measurer applies the rotation bar 17 to the forearm 39 of the human body. The angle can be read by the angle scale 19 based on the straight line 18 of the rotating bar 17. Since the rotating bar 17 has transparency, the angle can be read reliably without being disturbed by the rotating bar 17. Thus, the relative angle between the upper arm 38 and the forearm 39 can be measured.

  At this time, the measurer can observe the eyelid 21a of the pointer 21. In accordance with such observation, the inclination angles of the upper arm 38 and the forearm 39 are derived with respect to the direction of gravity, that is, the vertical direction. As a result of the inclination angle being related to the relative angle between the upper arm 38 and the forearm 39, the relative relationship between the entire human body and the upper arm 38 or the forearm 39 is further defined in measuring the relative angle between the upper arm 38 and the forearm 39. Thus, for example, in the field of rehabilitation, the degree of recovery of the treatment subject can be determined quantitatively and finely.

  FIG. 7 shows the appearance of an angle measuring instrument 11a according to the second embodiment of the present invention. In this angle measuring device 11 a, a support shaft 42 is formed on the support 14 at one end of the first arm, that is, the fixed arm 41. An annular member 43 is received by the support shaft 42 so as to be rotatable about the axis of the support shaft 42. The second arm, that is, the movable arm 44 is attached to the annular member 43. Thus, the movable arm 44 is connected to the fixed arm 41 so as to be relatively rotatable about the axis of the support shaft 42. Based on such relative rotation, the movable arm 44 can be superimposed on the fixed arm 41 in a posture parallel to the fixed arm 41. The angle measuring device 11a is folded. Similarly, the movable arm 44 can be positioned at a coaxial position extending on an extension line of the fixed arm 41 based on relative rotation. The annular member 43 is provided with an arrow display 45 that indicates a relative angle difference of 180 degrees with the movable arm 44 at the coaxial position of the movable arm 44.

  The movable arm 44 is connected to the annular member 43 so as to be rotatable around a reference straight line orthogonal to the axis of the support shaft 42. In realizing such rotation, the annular member 43 is formed with a cylindrical portion 46 that defines an axis along a reference straight line. The movable arm 44 is formed with a rotating shaft 47 that is received by the cylindrical portion 46. Thus, the second rotary slide arm 24 changes its posture between a first posture extending parallel to the axis of the support shaft 42 and a second posture extending along one plane orthogonal to the axis of the support shaft 42. be able to. Similarly, the fixed arm 41 is connected to the support 14 so as to be rotatable around a reference straight line. Similar to the annular member 42 and the movable arm 44, a cylindrical portion 46 and a rotating shaft 47 are formed on the support 14 and the fixed arm 41. Thus, the first rotary slide arm 23 changes its posture between a first posture extending parallel to the axis of the support shaft 42 and a second posture extending along one plane orthogonal to the axis of the support shaft 42. be able to. The movable range of the rotating shaft 47 within the cylindrical portion 46 may be restricted to 90 degrees, for example. It should be noted that other mechanisms may be used in realizing the posture change of the first and second rotary slide arms 23 and 24.

  In the second embodiment, for example, as shown in FIG. 8, the guide shaft 31 of the first and second rotary slide arms 23, 24 is received by a slider 48 that is movably received in the long groove 33. A rubber bush 49 is incorporated in the slider 48. The guide shaft 31 is fitted into the rubber bush 49. The relative rotation between the first and second rotary slide arms 23 and 24 and the fixed and movable arms 41 and 44 is moderately restricted by the frictional force between the guide shaft 31 and the rubber bush 49. Thus, the postures of the first and second rotary slide arms 23 and 24 are reliably maintained. Based on the displacement of the slider 48, the parallel movement of the first and second rotary slide arms 23, 24 is realized. In addition, the same reference numerals are assigned to the configurations and structures equivalent to those in the first embodiment.

  Now, suppose a scene where the pelvic inclination of the human body is measured. The movable arm 44 is positioned at a coaxial position around the support shaft 42. The first and second rotary slide arms 23 and 24 are maintained in a posture parallel to the axis of the support shaft 42. At the same time, “90” degrees and “270” degrees of the angle scale 19 are adjusted to the arrow display 22 adjacent to the fixed arm 41 and the movable arm 44. As a result, the horizontal posture of the fixed and movable arms 41 and 44 can be established when the hook 21a of the pointer 21 is adjusted to “0” degree or “180” degree of the angle scale 19. Thereafter, as described above, the measurement of the inclination of the pelvis may be advanced.

  Next, it is assumed that a human body measures the upper arm and forearm angles. The first and second rotary slide arms 23, 24 are stored in fixed and movable arms 41, 44 based on translation and rotation. The “0” degree of the angle scale 19 is adjusted to the arrow display 22 adjacent to the fixed arm 41. Thereafter, as described above, the measurer applies the fixed arm 41 to the upper arm of the human body, for example. Subsequently, the measurer places the movable arm 44 on the forearm of the human body. The angle can be read by the angle scale 19 based on the arrow display 45. Thus, the relative angle between the upper arm and the forearm can be measured. The movable arm 44 can function as the rotary bar 17 described above.

  In addition, the angle measuring instrument 11a according to the second embodiment can be used, for example, when the inclination angle of the spine is measured in the front-rear direction. At this time, in the angle measuring device 11a, the fixed arm 41 and the movable arm 44 are rotated around the axis of the rotation shaft 47. As a result, the first and second rotary slide arms 23 and 24 are positioned in a second posture extending along a plane orthogonal to the axis of the support shaft 42. For example, as shown in FIG. 9, when the measurer presses the tips of the first and second rotary slide arms 23, 24 against the chest and abdomen of the human body, the inclination angle is indicated by the heel 21 a of the pointer 21. In this way, the inclination angle of the spine can be measured. At this time, the distance between the tip of the first rotary slide arm 23 and the fixed arm 41 and the distance between the tip of the second rotary slide arm 24 and the movable arm 44 are adjusted to a constant value. The screw member 34 described above may be used to fix the first and second rotary slide arms 23 and 24.

  In the angle measuring devices 11 and 11a as described above, a temporary fixing member that temporarily fixes the pointer 21 around the rotation axis may be further attached to the tilt angle meter 13. For example, as shown in FIG. 10, such a temporary fixing member may be configured by an elastic member 53 received by the casing 52 of the tilt angle meter 13. The elastic member 53 can be pressed against the pointer 21, for example. When the elastic member 53 is pressed in this manner, the pointer 21 is prevented from rotating by the contact pressure of the elastic member 53. When the elastic member 53 is pulled away from the pointer 21, the rotation of the pointer 21 is allowed. In measuring the relative angle between the upper arm and the forearm, the measurer can press the elastic member 53 against the pointer 21 with a fingertip relatively easily. Thus, if the pointer 21 is temporarily fixed during observation of the pointer 21, the vertical direction can be specified with high accuracy. In any case, in the tilt angle meter 13, the pointer 21 may be formed of a disk. In this case, the ridge 21a may be drawn on the disk. The weight may be incorporated in the disc at a position shifted from the flange 21a by a central angle of 180 degrees.

  In the angle measuring devices 11 and 11a as described above, an electronic tilt angle meter may be used instead of the pendulum tilt angle meter 13 described above. Generally, in such an electronic tilt angle meter, the direction of gravity is specified based on a strain gauge. In this case, for example, the inclination angles of the first fixed arm 12, the second fixed arm 15, the fixed arm 41, and the movable arm 44 may be specified with respect to the direction of gravity. The specified inclination angle may be digitally displayed on the display, for example.

Claims (11)

A first arm, a second arm connected to the first arm so as to be relatively rotatable about the support shaft, an angle scale for displaying a rotation angle about the support shaft at least within a movable range of the first and second arms, and at least An angle measuring device comprising: an inclination angle meter that specifies a direction of gravity with respect to the first arm. 2. The angle measuring device according to claim 1, wherein the tilt angle meter includes a pointer that rotates around a rotation axis coaxial with a support shaft and specifies a direction of gravity. 3. The angle measuring device according to claim 2, wherein the angle scale rotates relative to the support shaft. 2. The angle measuring instrument according to claim 1, wherein an extension arm extending on an extension line of the first arm, a first measurement arm attached to the first arm and extending parallel to the support shaft, and the extension arm And an angle measuring instrument, further comprising a second measuring arm attached to the arm and extending parallel to the support shaft. 5. The angle measuring instrument according to claim 4, wherein the first measuring arm moves in parallel along the first arm. 5. The angle measuring instrument according to claim 4, wherein the second measuring arm moves in parallel along the extension arm. 5. The angle measuring instrument according to claim 4, wherein the first measuring arm has a first posture extending parallel to the support shaft and a second posture extending along one plane orthogonal to the support shaft. Angle measuring device characterized by changing posture between the two. 5. The angle measuring instrument according to claim 4, wherein the second measuring arm has a first posture extending parallel to the support shaft and a second posture extending along one plane perpendicular to the support shaft. Angle measuring device characterized by changing posture between the two. 3. The angle measuring instrument according to claim 2, further comprising a temporary fixing member that temporarily fixes the pointer in a stationary manner around the rotation axis. 2. The angle measuring device according to claim 1, wherein the angle scale displays an angle at a predetermined interval over 360 degrees around the support shaft. A first arm, a first measurement arm attached to the first arm, an extension arm extending on an extension line of the first arm, a second measurement arm attached to the extension arm, and rotating about a predetermined rotation axis. The first measuring arm includes a measuring posture perpendicular to the first arm and a retracted posture extending in parallel with the first arm. The angle measurement is characterized in that the posture of the second measurement arm is changed between a measurement posture orthogonal to the second arm and a retracted posture extending parallel to the second arm. vessel.

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