JP2018029633A - Goniometer for human body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a goniometer for a human body where an angle defined by a first arm part and a second arm part is locked every prescribed angle and a movable range of joint and the like of a human body can be readily measured.SOLUTION: A goniometer 101 includes: a first arm part 1; a second arm part 2; an angle display member 3 fixed to the first arm part 1; and a locking mechanism. The second arm part 2 is supported to the first arm part 1 so as to be rotatable about a rotation axis AX. The locking mechanism locks an angle defined by the first arm part 1 and the second arm part 1 every prescribed angle (such as 5 degrees).SELECTED DRAWING: Figure 1

Description

  The present invention relates to a goniometer, and more particularly to a goniometer for a human body used for measuring a range of motion of a human body.

  Conventionally, in medical fields such as rehabilitation and orthopedics, goniometers (angle meters) have been used to quantitatively measure the range of motion of human joints, etc., in order to quantify the effects of rehabilitation and to classify aftereffects. It has been.

  For example, Patent Literature 1 includes a first arm unit, a second arm unit, and a display unit, and an angle formed by the first arm unit and the second arm unit (the rotation of the first arm unit and the second arm unit). There is disclosed a digital goniometer in which the amount of movement) is digitally displayed on a display unit.

Japanese Utility Model Publication No. 5-74503

  However, in the goniometer as shown in Patent Document 1, the angle between the first arm portion and the second arm portion varies due to external impact and the like. It may be difficult to measure the range of motion.

  The goniometer is provided with a function for holding the display value shown on the display section after the range of motion measurement. However, there is an operation for holding the display value, which is troublesome when measuring the range of motion. Will increase. Further, since the above function is provided, the structure of the goniometer itself is complicated, and the manufacturing cost and product cost are increased.

  An object of the present invention is for a human body that can easily measure a range of motion of a joint of a human body, etc., with an angle formed between a first arm portion and a second arm portion being locked at a predetermined angle with a simple configuration. To provide a goniometer.

The goniometer for human body of the present invention is
A first arm part;
A second arm portion supported to be rotatable about a rotation axis with respect to the first arm portion;
A locking mechanism that locks the angle formed by the first arm part and the second arm part for each predetermined angle;
It is characterized by providing.

  With this configuration, since the angle formed by the first arm portion and the second arm portion is locked at every predetermined angle, a movable range such as a joint of a human body can be easily measured. Moreover, since it is a comparatively simple structure, the goniometer for human bodies which can be manufactured at low cost can be realized.

  According to the present invention, with a simple configuration, the angle formed by the first arm portion and the second arm portion is locked for each predetermined angle, and the range of motion of a human body joint or the like can be easily measured. A goniometer can be realized.

FIG. 1A is a perspective view of the goniometer 101 of the present invention, and FIG. 1B is a perspective view of the goniometer 101 viewed from another viewpoint. 2A is a front view of the goniometer 101 of the present invention, and FIG. 2B is a rear view of the goniometer 101. FIG. 3A is a plan view of the goniometer 101 of the present invention, and FIG. 3B is a bottom view of the goniometer 101. FIG. 4A is a right side view of the goniometer 101 of the present invention, and FIG. 4B is a left side view of the goniometer 101. FIG. 5A is a perspective view of the goniometer 101 when the second arm portion 2 is rotated by 45 ° with respect to the first arm portion 1, and FIG. It is a perspective view of the goniometer 101 when the 2nd arm part 2 is rotated 180 degrees. FIG. 6 is a partially enlarged view of the angle display member 3 provided in the goniometer 101. FIG. 7A is an enlarged cross-sectional view of the goniometer 101 showing the locking mechanism before rotating, and FIG. 7B is an enlarged cross-sectional view of the goniometer 101 showing the locking mechanism being rotated. FIG. 7C is an enlarged cross-sectional view of the goniometer 101 showing the locking mechanism when locked. FIG. 8A is a perspective view of the goniometer 102 according to the second embodiment, and FIG. 8B is an exploded perspective view of the goniometer 102. FIG. 9A is a front view of the goniometer 102, and FIG. 9B is a cross-sectional view taken along the line AA in FIG. 9A. FIG. 10A is a perspective view of the goniometer 103 according to the third embodiment, and FIG. 10B is an exploded perspective view of the goniometer 103. 11A is a front view of the goniometer 103, and FIG. 11B is a cross-sectional view taken along the line BB in FIG. 11A.

  Hereinafter, several specific examples will be given with reference to the drawings to show a plurality of modes for carrying out the present invention. In each figure, the same reference numerals are assigned to the same portions. In consideration of ease of explanation or understanding of the main points, the embodiments are shown separately for convenience, but the components shown in different embodiments can be partially replaced or combined. In the second and subsequent embodiments, description of matters common to the first embodiment is omitted, and only different points will be described. In particular, the same operation effect by the same configuration will not be sequentially described for each embodiment.

<< First Embodiment >>
FIG. 1A is a perspective view of the goniometer 101 according to the first embodiment, and FIG. 1B is a perspective view of the goniometer 101 viewed from another viewpoint. FIG. 2A is a front view of the goniometer 101, and FIG. 2B is a rear view of the goniometer 101. 3A is a plan view of the goniometer 101, and FIG. 3B is a bottom view of the goniometer 101. FIG. 4A is a right side view of the goniometer 101, and FIG. 4B is a left side view of the goniometer 101. FIG. 5A is a perspective view of the goniometer 101 when the second arm portion 2 is rotated by 45 ° with respect to the first arm portion 1, and FIG. It is a perspective view of the goniometer 101 when the 2nd arm part 2 is rotated 180 degrees. FIG. 6 is a partially enlarged view of the angle display member 3 provided in the goniometer 101.

  The goniometer 101 includes a first arm portion 1, a second arm portion 2, an angle display member 3, a support shaft member 4, a ball plunger 7, and the like.

  The goniometer of the present invention is used in medical fields such as rehabilitation and orthopedics. The goniometer is used for quantitative measurement of a range of motion such as a joint of a human body, for example, for quantifying the effect of rehabilitation and for certifying a grade of aftereffects. Specifically, the movable range of the joints of the human body and the like is measured by moving the first arm unit 1 and the second arm unit 2 in accordance with the rotation of the joints by the patient.

  As for the size of the goniometer 101 according to the present embodiment, for example, in FIG. 2A, the length in the left-right direction is 425 mm, the height in the up-down direction is 56 mm, and the thickness is 12 mm. Moreover, the magnitude | size of the 1st arm part 1 is 6 mm in the height of the up-down direction in FIG. 2 (A), for example, and thickness is 12 mm. The size of the second arm part 2 is, for example, a length of 375 mm in the left-right direction in FIG. 2A, a height of 6 mm in the vertical direction, and a thickness of 12 mm.

  The first arm portion 1 is a rod-like member that extends in the X-axis direction. The 2nd arm part 2 is a substantially rod-shaped member. As shown in FIG. 6, the first arm portion 1 is configured by connecting a first arm member 11 and a first rod-like member 12 with a screw 5. The second arm portion 2 is configured by connecting a second arm member 21 and a second rod-shaped member 22 with a screw 5.

  The second arm portion 2 is supported by the first arm portion 1 so as to be rotatable about a rotation axis AX along the Y-axis direction. Specifically, the first end of the second arm portion 2 is pivotally supported by the support shaft member 4 on the angle display member 3 fixed to the first end of the first arm portion 1. That is, the first end of the first arm portion 1 and the first end of the second arm portion 2 are pivotally supported via the angle display member 3. The angle display member 3 is an arc-shaped flat plate having a first surface S1 and a second surface S2 facing each other and having a substantially semicircular opening CP. The first arm portion 1 and the second arm portion 2 are, for example, aluminum square bars. The support shaft member 4 is, for example, a metal screw, and the angle display member 3 is, for example, an aluminum flat plate.

  The second arm portion 2 has a guide portion 6 and a pointer 9. The guide portion 6 is a portion protruding in the −Y direction, and the pointer 9 is a needle-like protrusion provided at the tip of the guide portion 6. When the second arm portion 2 rotates about the rotation axis AX, the guide portion 6 moves along the arc-shaped end surface of the angle display member 3 in the circumferential direction (circumferential direction R in FIG. 2A). To see).

  The angle display member 3 is provided with an angle display 10 and a plurality of grooves 8. The angle display 10 is, for example, a groove formed in the first surface S1 in order to display every predetermined angle (5 degrees) up to 180 degrees with the −X direction parallel to the first arm unit 1 being 0 degrees. Therefore, the angle formed by the first arm portion 1 and the second arm portion 2 can be quantitatively measured by reading the angle display 10 indicated by the pointer 9. The plurality of grooves 8 are grooves formed periodically (detailed later) on the arc-shaped end surface of the angle display member 3, for example.

  Further, as shown in FIG. 6 and the like, a ball plunger 7 is fixed to the guide portion 6 of the second arm portion 2. The ball plunger 7 has a cylinder, a ball, and a coil spring. The ball plunger 7 has a structure in which a coil spring is sealed in the cylinder with a ball so that a part of the ball is exposed from the cylinder. A through hole that is internally threaded is formed in the guide portion 6 at a position that faces the end face of the angle display member 3, and by screwing the ball plunger 7 that is externally threaded into the through hole, A ball plunger 7 is fixed to the guide portion 6.

  In the present embodiment, a part of the ball of the ball plunger 7 exposed from the cylinder and the plurality of groove portions 8 correspond to the “locking mechanism” in the present invention. Moreover, in this embodiment, a part of ball | bowl of the ball plunger 7 exposed from a cylinder is an example of the "protrusion part" in this invention. As described above, the ball plunger 7 of this embodiment has a structure in which a coil spring is sealed in a cylinder with a ball. Therefore, a part of the ball exposed from the cylinder (“protrusion” in the present invention) has elasticity.

  Next, the “locking mechanism” in the present invention will be specifically described with reference to the drawings. FIG. 7A is an enlarged cross-sectional view of the goniometer 101 showing the locking mechanism before rotating, and FIG. 7B is an enlarged cross-sectional view of the goniometer 101 showing the locking mechanism being rotated. FIG. 7C is an enlarged cross-sectional view of the goniometer 101 showing the locking mechanism when locked. In FIG. 7A, FIG. 7B, and FIG. 7C, the coil spring included in the ball plunger 7 is not shown for easy understanding of the structure.

  As shown in FIG. 7A, the ball plunger 7 is fixed to the guide portion 6, and a part of the ball 42 exposed from the cylinder 41 (“protruding portion” in the present invention) is formed on the end surface of the angle display member 3. Contact and engage with the groove 8.

  Next, as shown in FIG. 7B, when the second arm portion 2 is rotated, for example, in the circumferential direction R, a part of the ball 42 exposed from the cylinder 41 extends along the end surface of the angle display member 3. Move away from the groove 8. Specifically, when a force for elastically deforming the coil spring is applied to the ball 42, a part of the ball 42 exposed from the cylinder 41 is detached from the groove portion 8.

  When a part of the ball 42 exposed from the cylinder 41 is in contact between the groove portions 8, a coil spring (not shown) sealed in the cylinder 41 is elastically deformed, and the ball 42 faces the inside of the cylinder 41. (Refer to the arrow in the cylinder 41 in FIG. 7B).

  As shown in FIG. 7C, when the second arm portion 2 is further rotated in the circumferential direction R, the ball 42 moved into the cylinder 41 is pushed out by the elastic force of a coil spring (not shown) (FIG. 7 ( (See the arrow in the cylinder 41 in C)), and engage with the groove 8 again.

  At this time, the ball 42 of the ball plunger 7 is subjected to a pushing force toward the outside of the cylinder 41 (the same direction as the arrow in the cylinder 41 in FIG. 7C) by the elastic force of a coil spring (not shown). Yes. Therefore, when a part of the ball 42 is engaged with the groove 8, the rotational positions of the first arm portion 1 and the second arm portion 2 are maintained.

  In addition, when the second arm portion 2 is rotated around the rotation axis, the plurality of groove portions 8 have a predetermined angle (for example, 5 degrees) formed by the first arm portion 1 and the second arm portion 2. It is periodically formed on the end surface of the angle display member 3 so as to be locked at every time. The position of the pointer 9 coincides with the angle display 10 (scale) when locked.

  As described above, the “locking mechanism” in the present invention locks the angle formed by the first arm portion 1 and the second arm portion 2 for each predetermined angle, and the first arm portion 1 and the second arm portion 2 Has a function of holding the rotational position.

  The goniometer 101 according to the present embodiment has the following effects.

(A) The goniometer 101 locks the angle formed by the first arm portion 1 and the second arm portion 2 for each predetermined angle, and maintains the rotational position of the first arm portion 1 and the second arm portion 2. It has a “locking mechanism”. With this configuration, it is possible to easily measure a range of motion such as a joint of a human body. Moreover, since it is a comparatively simple structure, the goniometer for human bodies which can be manufactured at low cost can be realized.

(B) The main parts (the first arm part 1, the second arm part 2, and the angle display member 3) of the goniometer 101 are made of aluminum. Therefore, compared with the conventional goniometer (for example, the University of Tokyo type goniometer whose main part is stainless steel), it can be reduced in cost and weight.

(C) In the goniometer 101, the ball plunger 7 is fixed to the guide portion 6 of the second arm portion 2 by screwing. Therefore, it is possible to realize a “locking mechanism” in which the protruding portion (a part of the ball exposed from the cylinder) engages with the groove portion 8 without requiring high dimensional accuracy and assembly accuracy.

(D) In this embodiment, the 1st arm part 1 is comprised by connecting the 1st arm material 11 and the 1st rod-shaped member 12 with the screw | thread 5. In FIG. Therefore, the length of the 1st arm part 1 can be changed easily by selecting the length of the 1st rod-shaped member 12 connected with the 1st arm material 11. FIG. Similarly, the second arm portion 2 is configured by connecting a second arm member 21 and a second rod-shaped member 22 with a screw 5. Therefore, the length of the 2nd arm part 2 can be changed easily by selecting the length of the 2nd rod-shaped member 22 connected with the 2nd arm material 21. FIG.

(E) In this embodiment, the position of the pointer 9 when locked is coincident with the angle display 10 (scale). Therefore, the angle formed by the first arm portion 1 and the second arm portion 2 can be easily read from the angle display 10 (scale) indicated by the pointer 9.

  In the present embodiment, the ball plunger 7 that seals the coil spring in the cylinder with a ball is shown, but the present invention is not limited to this. As long as the protruding portion (a part of the ball exposed from the cylinder) has elasticity, the member sealed in the cylinder may be another elastic member such as a leaf spring, oil, or gas. In addition, the ball itself which the ball plunger 7 has may have elasticity, for example, may be elastic members, such as a rubber ball.

  In the present embodiment, an example in which the plurality of groove portions 8 are formed on the arc-shaped end surface of the angle display member 3 has been described. However, the present invention is not limited to this configuration. The plurality of grooves 8 may be formed on the second surface S2 of the angle display member 3, for example. In this case, the ball plunger 7 is fixed to the second arm portion 2 so that the ball (the “protruding portion” in the present invention) engages with the groove portion 8 formed on the second surface S2. Further, the angle display member 3 may be provided with a “projection” and the second arm 2 may be provided with a groove.

  In the present embodiment, the “locking mechanism” in which a part of the ball of the ball plunger 7 is engaged with the groove portion 8 has been described, but the present invention is not limited to this configuration. The “locking mechanism” is a mechanism in which, for example, a part of the ball of the ball plunger 7 is engaged with a through hole formed in the angle display member 3, thereby engaging the first arm portion 1 and the second arm portion 2. The structure which stops may be sufficient.

  In the present embodiment, an example in which the angle display member 3 is an arc-shaped flat plate having a substantially semicircular opening CP has been described, but the present invention is not limited to this configuration. The angle display member 3 is not limited to a flat plate. The shape of the angle display member 3 can be appropriately changed within a range where the functions and effects of the present invention are exhibited. Further, the angle display member 3 may not have the opening CP.

  In the present embodiment, the main part (the first arm part 1, the second arm part 2, and the angle display member 3) is shown for the goniometer made of aluminum, but the main part may be made of stainless steel or the like. When the main part of the goniometer is made of stainless steel, it is excellent in environmental resistance and suppresses deterioration due to aging.

  Further, in the present embodiment, an example is shown in which the angle display 10 is a groove for displaying a predetermined angle (5 degrees) from 0 degree to 180 degrees, but the present invention is not limited to this configuration. The angle displayed on the angle display 10 is not limited to 0 to 180 degrees, and can be changed as appropriate. Further, the predetermined angle (unit of display angle) is not limited to every 5 degrees, and can be appropriately changed, for example, every 1 degree or every 10 degrees. The angle display 10 may be a printed material formed on the surface of the angle display member 3, for example. Further, the position of the pointer 9 when locked is not necessarily the same as the angle display 10 (scale).

  In the present embodiment, the example in which the pointer 9 is a needle-like protrusion provided on the second arm portion 2 has been described, but the present invention is not limited to this configuration. The shape and structure of the pointer 9 can be changed as appropriate within the scope of the effects and advantages of the present invention. For example, a groove or a printed material formed on the surface of the second arm 2 may be used.

<< Second Embodiment >>
FIG. 8A is a perspective view of the goniometer 102 according to the second embodiment, and FIG. 8B is an exploded perspective view of the goniometer 102. FIG. 9A is a front view of the goniometer 102, and FIG. 9B is a cross-sectional view taken along the line AA in FIG. 9A. 8 and 9 show the goniometer 102 in a state where the second arm portion 2 is rotated 180 ° with respect to the first arm portion 1.

  The goniometer 102 includes a first arm portion 1, a second arm portion 2, a support shaft member 4A, an elastic portion 25, and the like.

  The first arm portion 1 is a substantially rectangular flat plate member whose longitudinal direction coincides with the X-axis direction. The second arm portion 2 is a substantially rectangular flat plate member. Both the one end of the first arm portion 1 and the one end of the second arm portion 2 have a shape processed into an arc shape. The first arm portion 1 and the second arm portion 2 are, for example, resin flat plates.

  The second arm portion 2 is supported by the first arm portion 1 so as to be rotatable about a rotation axis AX along the Y-axis direction. Specifically, as shown in FIG. 8B, a through hole 31 formed near one end of the first arm portion 1 and a through hole 32 formed near one end of the second arm portion 2 4A, the support shaft member 4A is inserted. In this way, the second arm portion 2 is directly supported by the first arm portion 1 by the support shaft member 4A. The support shaft member 4 </ b> A is a resin member, for example, and is a resin member that is press-fitted and inserted into the through holes 31 and 32. The support shaft member 4A may be, for example, a resin screw or a metal screw.

  In addition, a pointer and an angle display (not shown) are formed near one end of the first arm portion 1 and near one end of the second arm portion 2, respectively, and the first arm portion 1 and the second arm portion 2 are formed. The angle formed by can be easily read.

  As shown in FIG. 9B and the like, the second arm portion 2 has an elastic portion 25 and a protruding portion 26. The elastic part 25 is disposed in the vicinity of one end of the second arm part 2 and includes an opening 51 and a thin part 52. The thin portion 52 is a portion having a relatively smaller thickness (thickness in the Y-axis direction) than the other portions of the second arm portion 2. The thin portion 52 is disposed inside the opening 51 that penetrates both main surfaces of the second arm portion 2, and one end thereof is partially connected to the second arm portion. A conical protrusion 26 is provided at the other end of the thin portion 52. The projecting portion 26 is a main surface facing the first arm portion 1 of both main surfaces of the second arm portion 2 in a state where the second arm portion 2 is pivotally supported by the first arm portion 1 (FIG. 9B). Is a convex part formed on the lower surface side of the second arm part 2 in FIG.

  The first arm portion 1 has a plurality of groove portions 8A. The plurality of groove portions 8A are conical shapes formed on the main surface (the upper surface of the first arm portion 1 in FIG. 9B) facing the second arm portion 2 of both the main surfaces of the first arm portion 1. It is a recessed part, and is arrange | positioned at equal angles (circumferentially periodically). The plurality of groove portions 8 </ b> A are formed at positions corresponding to the positions of the protruding portions 26 in a state where the second arm portion 2 is pivotally supported by the first arm portion 1. Therefore, as shown in FIG. 9B, the protruding portion 26 engages with the groove portion 8A in a state where the second arm portion 2 is pivotally supported on the first arm portion 1.

  In the present embodiment, the protruding portion 26 and the plurality of groove portions 8A correspond to the “locking mechanism” in the present invention. As described above, the second arm portion 2 is made of resin, and the protruding portion 26 has a structure provided at the other end of the thin portion 52 having a relatively small thickness. Therefore, in this embodiment, the thin part 52 (and the protrusion part 26) has elasticity.

  The plurality of groove portions 8A have a predetermined angle (for example, 5 degrees) between the first arm portion 1 and the second arm portion 2 when the second arm portion 2 is rotated about the rotation axis. It arrange | positions to the main surface of the 1st arm part 1 at equal angle (cyclically periodically) so that it may latch at every.

  In the goniometer 102 according to the present embodiment, the main parts (first arm part 1 and second arm part 2) are made of resin. Therefore, the cost and weight can be further reduced as compared with the case where the main part of the goniometer is made of aluminum or stainless steel.

  As shown in the present embodiment, a configuration in which portions other than the “projections” have elasticity may be used. The “locking mechanism” in the present invention is not limited to a configuration having elasticity only in the “projection portion” or the “thin wall portion”. If there is a “locking mechanism” that locks the angle formed by the first arm portion 1 and the second arm portion 2 for each predetermined angle, the elastic portions are the first arm portion 1 and the second arm portion. The structure distributed over 2 may be sufficient.

<< Third Embodiment >>
In 3rd Embodiment, the example from which the shape of a groove part differs from the goniometer 102 which concerns on 2nd Embodiment is shown.

  FIG. 10A is a perspective view of the goniometer 103 according to the third embodiment, and FIG. 10B is an exploded perspective view of the goniometer 103. 11A is a front view of the goniometer 103, and FIG. 11B is a cross-sectional view taken along the line BB in FIG. 11A. 10 and 11 show the goniometer 103 in a state where the second arm portion 2 is rotated by 180 ° with respect to the first arm portion 1.

  The goniometer 103 according to the present embodiment is different from the goniometer 102 according to the second embodiment in the structure of the plurality of groove portions 8B. Other configurations are substantially the same as the goniometer 102.

  The first arm portion 1 has a plurality of groove portions 8B. The plurality of groove portions 8 </ b> B are concave portions formed on the main surface (the upper surface of the first arm portion 1 in FIG. 11B) that faces the second arm portion 2 among the two main surfaces of the first arm portion 1. . As shown in FIG. 10 (A), the plurality of groove portions 8B are grooves between teeth of the face gear-shaped portion formed on the main surface of the first arm portion 1, and are equiangular (circularly cycled). In fact). The plurality of groove portions 8 </ b> B are formed at positions corresponding to the positions of the protruding portions 26 in a state where the second arm portion 2 is pivotally supported by the first arm portion 1. Therefore, as shown in FIG. 11B, the protruding portion 26 engages with the groove portion 8B in a state where the second arm portion 2 is pivotally supported by the first arm portion 1.

  In the present embodiment, the protruding portion 26 and the plurality of groove portions 8B correspond to the “locking mechanism” in the present invention.

  Even in such a configuration, the basic configuration of the goniometer 103 is the same as that of the goniometer 102 according to the second embodiment, and the same operations and effects as the goniometer 102 are achieved.

<< Other Embodiments >>
In the embodiment described above, the example in which the second arm portion 2 is directly (or indirectly) pivotally supported by the first arm portion 1 is shown, but the present invention is not limited to this configuration. The first arm portion 1 and the second arm portion 2 may be supported so as to be rotatable about the rotation axis AX. For example, the second arm portion 2 is attached to the angle display member 3 that is an arcuate guide rail. The first arm portion 1 and the second arm portion 2 may rotate about the rotation axis AX when the second arm portion 2 moves along the angle display member 3.

  In the embodiment described above, the “locking mechanism” that locks the angle formed by the first arm portion 1 and the second arm portion 2 every predetermined angle (5 degrees) is shown, but the present invention is not limited to this. It is not a thing. The predetermined angle of the “locking mechanism” can be appropriately changed, and may be 3 degrees or 10 degrees, for example. Further, the predetermined angle of the “locking mechanism” is not limited to an equal angle, and may be, for example, 5 degrees in a certain range and 10 degrees in another rotational range.

  Finally, the description of the above embodiment is illustrative in all respects and not restrictive. Modifications and changes can be made as appropriate by those skilled in the art. The scope of the present invention is shown not by the above embodiments but by the claims. Furthermore, the scope of the present invention includes modifications from the embodiments within the scope equivalent to the claims.

AX ... Rotating shaft CP ... Opening S1 ... First surface S2 of angle display member ... Second surface 1 of angle display member ... First arm portion 2 ... Second arm portion 3 ... Angle display members 4, 4A ... Support shaft member DESCRIPTION OF SYMBOLS 5 ... Screw 6 ... Guide part 7 ... Ball plunger 8, 8A, 8B ... Groove part 9 ... Pointer 10 ... Angle display 11 ... 1st arm material 12 ... 1st rod-shaped member 21 ... 2nd arm material 22 ... 2nd rod-shaped member 25 ... Elastic part 26 ... Projection part 31, 32 ... Through hole 41 ... Cylinder 42 ... Ball 51 ... Opening part 52 ... Thin wall part 101, 102, 103 ... Goniometer

Claims (4)

A first arm part;
A second arm portion supported to be rotatable about a rotation axis with respect to the first arm portion;
A locking mechanism that locks the angle formed by the first arm part and the second arm part for each predetermined angle;
A goniometer for the human body characterized by comprising:   The locking mechanism is configured such that a groove position and a protruding portion provided in the first arm portion and the second arm portion are engaged with each other so that the first arm portion and the second arm portion are rotated. The goniometer for human bodies according to claim 1, wherein An angle display member fixed to the first arm portion;
A pointer provided on the second arm portion and indicating an angle formed by the first arm portion and the second arm portion together with the angle display member;
With
The locking mechanism is configured such that a groove portion and a projecting portion provided in the second arm portion and the angle display member are engaged with each other, thereby rotating the first arm portion and the second arm portion. The goniometer for human bodies according to claim 1, wherein the goniometer is held.   The human body goniometer according to claim 2, wherein the protrusion has elasticity.

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