JP7000043B2 - angle gauge - Google Patents

Description

The present invention relates to a goniometer.

A protractor is a measuring instrument that measures various angles on an object. An example of a protractor is a protractor that measures the range of motion of a joint in the human body. For example, Patent Document 1 discloses a joint goniometer including a first and second arm portion and an adjusting means for adjusting a rotational resistance between the first and second arm portions.

Japanese Unexamined Patent Publication No. 2016-80395

For example, a protractor is usually operated by a measurer (ie, a person). Such a manually operated protractor preferably has high operability. For example, it is preferable that the goniometer can easily grasp the angle value at the time of operation.

The present invention has been made in view of the above points, and one of the problems is to provide an angle meter that can be easily operated and can easily grasp an angle value.

The invention according to claim 1 includes a first member and a second member that are relatively rotatable around a rotation shaft, and the first member is provided along the circumferential direction of the rotation shaft. It has a plurality of structural parts, and the second member is characterized by having an engaging portion that engages with any of the plurality of structural parts.

It is a perspective view of the goniometer which concerns on Example 1. FIG. It is a perspective view of the 1st member of the angle meter which concerns on Example 1. FIG. It is a perspective view of the 2nd member of the protractor which concerns on Example 1. FIG. It is a perspective view of the goniometer which concerns on Example 1. FIG. It is a perspective view at the time of operation of the angle meter which concerns on Example 1. FIG. It is a block diagram of the angle detection part of the angle meter which concerns on Example 1. FIG. It is a top view of the goniometer which concerns on the modification of Example 1. FIG. It is sectional drawing of the goniometer which concerns on the modification of Example 1. FIG.

Examples of the present invention will be described in detail below.

FIG. 1 is a perspective view of the angle meter 10 according to the first embodiment. The goniometer 10 has a first member (first rotating member) 20 and a second member (second rotating member) 30 that rotate relative to each other around the rotation axis AX. Further, in the present embodiment, the goniometer 10 forms a rotary shaft AX, and includes a shaft member 40 that rotatably supports (fixes) the first and second members 20 and 30 to each other.

The goniometer 10 can be used, for example, as a joint goniometer for measuring various range of motion of the human body. The goniometer 10 has a base portion B in the vicinity of the shaft member 40 and a handle portion H extending in a direction away from the base portion B. For example, a measurer who operates an angle meter 10 to measure an angle can operate it by holding the handle portion H.

FIG. 2 is a perspective view of the first member 20 of the protractor 10. The first member 20 has a substrate (first substrate) 21 molded into a plate shape as a whole. The substrate 21 has a base portion (first base portion) B1 in the vicinity of the rotation axis AX, and a handle portion H1 extending in a rod shape along a direction away from the base portion B1. Further, one of the main surfaces of the substrate 21 (hereinafter, simply referred to as the main surface) 21A is provided so as to face the second member 30.

The first member 20 has an annular structure 22 formed on the main surface 21A of the substrate 21 and extending in an annular shape along the circumferential direction of the rotation axis AX. The annular structure 22 is, for example, a plate-shaped portion provided on the main surface A of the substrate 21. Further, a plurality of recesses 23 are provided on the radial outer side surface of the rotary shaft AX in the annular structure 22 along the circumferential direction of the rotary shaft AX.

Each position of the recess 23 in the first member 20 corresponds to the angle value indicated by the protractor 10. That is, the first member 20 has a plurality of recesses 23 provided along the circumferential direction of the rotation axis AX and each provided at a predetermined angle position.

In this embodiment, each of the recesses 23 is continuously provided in a wavy shape as a whole. That is, in this embodiment, wavy irregularities are repeatedly formed on the side surface of the annular structure 22 as a plurality of recesses 23 at predetermined intervals.

Further, in this embodiment, the first member 20 has a gear (first gear) 24 fixed to the substrate 21 and arranged coaxially with the rotation shaft AX. In this embodiment, the main surface 21A of the substrate 21 has a recess 21B in the inner region of the annular structure 22 around the rotation axis AX. Further, the bottom surface of the recess 21B has a columnar convex portion 21C that protrudes from the bottom surface and has a central axis coaxial with the rotation axis AX. The gear 24 is fixed to the convex portion 21C. That is, the rotation shaft of the gear 24 and the rotation shaft AX of the first member 20 (second member 30) are arranged coaxially.

Further, in this embodiment, the first member 20 has a pin 25 protruding from the main surface 21A of the substrate 21. The pin 25 limits the relative rotation position (rotatable range) of the first member 20 with the second member 30. Further, in this embodiment, a scale M indicating an angle value measured by the angle meter 10 is engraved or printed on the main surface 21A of the substrate 21 of the first member 20.

FIG. 3 is a perspective view of the second member 30 of the protractor 10. The second member 30 has a substrate (second substrate) 31 molded into a plate shape as a whole. The substrate 31 has a base portion (second base portion) B2 in the vicinity of the rotation axis AX, and a handle portion H2 extending in a rod shape along a direction away from the base portion B2. Further, one of the main surfaces of the substrate 31 (hereinafter, simply referred to as the main surface) 31A is provided so as to face the main surface 21A of the first member 20. Note that FIG. 3 is a perspective view when the second member 30 is viewed from the main surface 31A side of the substrate 31.

The second member 30 has an engaging portion 32 that is fixed to the substrate 31 and engages with the recess 23 in the first member 20. In this embodiment, the main surface 31A of the substrate 31 is provided with a recess 31B along the circumferential direction of the rotation axis AX, and the engaging portion 32 is fixed in the recess 31B of the substrate 31. The recess 31B functions as an accommodating portion for accommodating the annular structure 22 (and the recess 23) of the first member 20 when the first and second members 20 and 30 are combined.

In this embodiment, the engaging portion 32 is coupled to the base portion 32A fixed to the base 31 and the base portion 32A, and extends in opposite directions in the circumferential direction of the rotation axis AX from the coupling portion CP with the base portion 32A. It has an arm portion 32B and a convex portion (engagement convex portion) 32C provided at the ends of the two arm portions 32B. In this embodiment, the engaging convex portion 32C is provided as a protrusion protruding from the arm portion 32B in the radial direction of the rotation axis AX at the end portion of the arm portion 32B.

The second member 30 is provided on the substrate 31 and has an angle sensor 33 that detects the angle formed by the first member 20 and the second member 30. The angle sensor 33 generates an electric signal (angle signal) according to the relative rotation position between the first member 20 and the second member 30. For example, the angle sensor 33 is a potentiometer.

In this embodiment, the second member 30 has a gear (second gear) 34 that is provided on the substrate 31 and meshes with the gear 24 of the first member 20. Further, the central axis (rotation axis) of the gear 34 is arranged at a position different from the rotation axis AX of the goniometer 10. The angle sensor 33 generates an electric signal according to the amount of rotation of the gear 34. In this embodiment, the angle sensor 33 is a potentiometer in which the rotation axis of the gear 34 is a shaft (rotation axis for angle detection).

Further, in this embodiment, the main surface 31A of the substrate 31 is provided with a groove 31C provided along the circumferential direction of the rotation axis AX. The groove 31C engages with the pin 25 of the first member 20 and functions as a rail for guiding the movement of the pin 25. The first member 20 rotates relative to the second member 30 while the pin 25 moves in the groove 31C. Further, the groove 31C has an end portion, and the moving range of the pin 25, that is, the rotatable range of the second member 30 with respect to the first member 20, is limited by the groove 31C.

The substrate 21, the annular structure 22 (recessed portion 23), the gear 24, and the pin 25 of the first member 20 are made of, for example, a resin material. The substrate 31, the engaging portion 32, and the gear 34 of the second member 30 are made of, for example, a resin material. Further, the shaft member 40 is made of, for example, a resin material. In addition, these members may be made of a metal material, for example.

As will be described later, in this embodiment, the annular structure 22 (recessed portion 23) and the engaging portion 32 have a structure in which they are engaged with each other by an elastic force. Specifically, the arm portion 32B of the engaging portion 32 has a cantilever spring structure in which one end thereof is fixed to the base portion 32A (that is, the second member 30) and the other end engages with the recess 23. As a result, the engaging portion 32 is urged against the recess 23.

Considering that the engaging portion 32 has a portion that elastically abuts on the concave portion 23, for example, the engaging portion 32 has a coil spring or a disc spring that gives an elastic force to the engaging convex portion 32C (contact portion). May be good. Further, even if at least one of the annular structure 22 (each of the recesses 23) and the engaging portion 32 has an elastic body (for example, resin (POM / PET / PC), stainless steel (SUS), spring steel (SUP)). good.

FIG. 4 is a perspective view of the goniometer 10 which transparently shows the substrate 31 of the second member 30. In FIG. 4, the outer shape of the base 31 of the second member 30 is shown by a broken line. Further, FIG. 5 is a perspective view of the angle meter 10 while the angle meter 10 is in use. Also in FIG. 5, the outer shape of the base 31 of the second member 30 is shown by a broken line. The operation of the goniometer 10 will be described with reference to FIGS. 4 and 5.

First, the outline of the operation of the protractor 10 will be described. The goniometer 10 can be configured, for example, to measure the range of motion of the elbow joint. Specifically, for example, the measurer (operator) arranges the shaft member 40 of the goniometer 10 in the vicinity of the elbow joint of the subject (subject), and the first and second members 20 are measured. Place it along the direction in which the person's humerus extends.

Then, the measurer rotates the second member 30 along the direction in which the radius or ulna of the person to be measured extends in a state where the first member 20 is arranged on the humerus (for example, FIG. 5). At this time, the angle formed by the first member 20 and the second member 30 is the range of motion of the elbow joint. The angle meter 10 is configured so that the measurer operates by holding the handle portions H1 and H2 of the first and second members 20 and 30.

Next, the state when the protractor 10 is used will be described. First, as shown in FIG. 4, the engaging portion 32 (engaging convex portion 32C) of the second member 30 is engaged with any of the plurality of recesses 23 provided in the annular structure 22 of the first member 20. It fits. Further, the gear 24 of the first member 20 and the gear 34 of the second member 30 mesh with each other.

For example, in the state shown in FIG. 4, the angle sensor 33 is set to output an electric signal (angle signal) of 0 degrees. As another example, in the state shown in FIG. 4, the power of the angle sensor 33 is set to be turned off. As a result, for example, the power source (for example, the voltage in the battery) is consumed only at the time of measurement, and power saving can be achieved.

Further, the engaging portion 32 of the second member 30 is configured such that the engaging convex portion 32C is urged toward the concave portion 23 of the second member 20. Specifically, when the engaging portion 32 is engaged with the concave portion 23, the engaging convex portion 32C of the engaging portion 32 is in a state of being pressed against the concave portion 23. For example, the arm portion 32B of the engaging portion 32 is configured and arranged so that the engaging convex portion 32C engages with the concave portion 23 in a state of being bent outward in the radial direction of the rotation shaft AX.

The arm portion 32B of the engaging portion 32 functions as a cantilever spring having the coupling portion CP with the base portion 32A as a fixed end and the engaging convex portion 32C as a free end. The elastic force on the radial inner side of the rotation axis AX applied by the arm portion 32B to the engaging convex portion 32C becomes an urging force that engages with the concave portion 23 with respect to the engaging convex portion 32C. In this way, the engaging portion 32 is engaged with any of the recesses 23 by the two urging engaging convex portions 32C.

The arm portion 32B may be directly coupled to the substrate 31, and in this case, for example, the engaging portion 32 is engaged with two arm portions 32B extending in opposite directions along the circumferential direction of the rotation axis AX. It may function as a combined convex portion 32C and have a convex portion protruding inward in the radial direction of the rotation axis AX from each end of the two arm portions 32B. Further, the engaging portion 32 is not limited to the case where the two arm portions 32B are provided. For example, the engaging portion 32 may be composed of one arm portion 32B or three or more arm portions 32B.

Next, as shown in FIG. 5, when the base 31 of the second member 30 is rotated with respect to the first member 20, the engaging portion 32, the angle sensor 33, and the gear are rotated according to the rotation of the base 31. 34 rotates (turns) relatively. The rotational movement of the second member 30 with respect to the first member 20 corresponds to a change in the angle formed by the first and second members 20 and 30 (that is, the angle indicated by the goniometer 10 as the measurement angle).

When the second member 30 is rotated, the recess 23 with which the engaging convex portion 32C of the engaging portion 32 is engaged is switched among the plurality of concave portions 23 provided in the first member 20. That is, the engagement position of the engaging portion 32 with the plurality of convex portions 23 changes according to the rotation of the second member 30.

For example, consider a case where the first and second members 20 and 30 are relatively rotated from one relative position forming one angular unit to another relative position forming another adjacent angular unit. First, at the relative position of 1, the engaging portion 32 is engaged with the recess 23 provided at the position (angle position) corresponding to the relative position of 1.

When the second member 30 is rotated by a predetermined rotation amount toward another adjacent relative position from this state, the engagement portion 32 with the corresponding recess 23 at the relative position of the one is engaged with the second member 30. The combined state is solved. That is, the engaging portion 32 is in a state of not engaging with any of the recesses 23.

Then, when the second member 30 reaches the other relative position (relative position range), it engages with another (adjacent) recess 23 provided at the position (angle position) corresponding to the other relative position. The joint 32 engages. In this way, when the second member 30 is rotated relative to the first member 20, it is provided on the engaging portion 32 of the second engaging portion 30 and the first member 20. Engagement and disengagement with any of the plurality of recesses 23 are repeatedly performed.

In this embodiment, the engaging portion 32 rotates together with the second member 30 in a urged state. Therefore, for example, when the rotation of the first and second members 20 and 30 is stopped during the measurement, the relative position between the first and second members 20 and 30 is maintained. Therefore, it is possible to prevent the relative positions of the first and second members 20 and 30 from being unintentionally changed during operation (rotation) or measurement (stop). Further, by adjusting the urging force applied to the engaging portion 32, the force required for the rotation operation and the position holding force at the time of stopping can be adjusted.

In this way, by using the angle meter 10, the measurer can tactilely sense the engagement state of the engaging portion 32 with the recess 23 (first member 20) when the second member 30 is rotated. be able to. For example, the measurer can operate the goniometer 10 while obtaining a click feeling.

Further, in this embodiment, the recesses 23 are arranged at predetermined angles (for example, every 5 degrees). Therefore, the measurer can tactilely recognize the measured angle by the number of tactile sensations felt when the engaging portion 32 engages with the recess 23. For example, the measurement angle can be calculated by multiplying the above-mentioned predetermined angle by the number of tactile sensations felt during rotation.

Further, in this embodiment, the engaging portion 32 rotates together with the second member 30 (base 31) in a state of being urged with respect to the recess 23. Therefore, for example, a sound (a "clicking sound") can be output when the engaging portion 32 and the recess 23 are engaged with each other. Therefore, the measurer can aurally sense the engagement state of the engaging portion 32 with the recess 23.

As described above, in the angle meter 10, the first member 20 has a plurality of recesses 23 along the circumferential direction of the rotation axis AX. Further, the second member 30 engages with any of the plurality of recesses 23 of the first member 20 when the first and second members 20 and 30 reach a predetermined relative position forming a predetermined angle. It has an engaging portion 32 to be engaged. Therefore, it is possible to provide the goniometer 10 which can be easily operated and can easily grasp the angle value.

The joint goniometer is expected to be used in rehabilitation facilities, massage facilities, orthopedic surgery in hospitals, and the like. Here, in the facility, the goniometer may be used by a visually impaired person or the like. As described above, the goniometer 10 has a configuration capable of tactilely or audibly (intuitively) grasping the measured angle. Therefore, by using the angle meter 10, even a visually impaired person can easily measure the angle, for example. That is, the protractor 10 can be used by a wide range of users.

Further, when considering the use of the angle meter 10 as the joint angle meter, the measurement resolution required for the angle meter 10 is about 5 degrees. That is, the joint goniometer often does not require finer resolution. Therefore, for example, by arranging the recess 23 in units of 5 degrees, which is the minimum resolution, it is possible to provide an angle meter 10 having significantly improved operability and angle graspability while satisfying the required specifications as a joint angle meter. can.

Further, the engaging convex portion 32C of the engaging portion 32 is in contact with the concave portion 23 (the substrate 21 (annular structure 22) of the first member 20) in a urged state. Therefore, the engaging portion 32 is in contact with the concave portion 23. When engaged with any of the recesses 23, the state is maintained.

That is, when the measurer stops the rotation of the first and second members 20 and 30 during the measurement, the relative position between the first and second members 20 and 30 is maintained. Therefore, it is possible to prevent the relative positions of the first and second members 20 and 30 from being unintentionally changed during operation (rotation) or measurement (stop). By adjusting the urging force applied to the engaging portion 32 according to the intended use, size, measurer, etc., the force required for rotation and the position holding force at the time of stopping are balanced (combined). be able to.

Further, in the present embodiment, the goniometer 10 has an angle sensor 33 that detects an angle formed by the first member 20 and the second member 30. Therefore, for example, in the angle meter 10, if the first and second members 20 and 30 are accurately rotated according to the measured portion (for example, the joint of the person to be measured), the measured angle is the angle sensor 33. Allows accurate judgment (without human intervention).

As shown in FIGS. 4 and 5, the angle sensor 33 includes the angle detection unit AS of the angle meter 10 together with the gear 24 provided on the first member 20 and the gear 34 provided on the second member 30. Configure. In other words, the angle meter 10 has an angle detection unit AS that electrically detects the angle formed by the first member 20 and the second member 30.

Further, in the present embodiment, the angle detection unit AS is provided on the gear 24 provided on the first member 20 and coaxially with the rotation shaft AX, and is provided on the second member 30 and meshes with the gear 24. It has a potentiometer (angle sensor 33) having a rotating gear 34 as a shaft.

Specifically, the gear 34 of the second member 30 meshes with the gear 24 of the first member 20 by relatively moving its rotation center (gear itself), and has a larger rotation speed than that of the gear 24. Rotate with. The angle sensor 33 generates a signal corresponding to the rotation of the gear 34 that rotates at this increased rotation speed. Thereby, for example, the angle can be accurately detected even for a slight angle value, that is, a slight rotation of the second member 30 with respect to the first member 20.

FIG. 6 is a block diagram of the angle detection unit AS. In this embodiment, the angle detection unit AS has, in addition to the angle sensor 33, a storage unit AS1 that stores angle data related to the measured angle. For example, the angle sensor 33 has a storage function of storing measurement data for a predetermined number of times as angle data. Therefore, in addition to the accuracy of the measurement, the workability related to the measurement is improved. For example, angle measurement can be continuously performed over a plurality of subjects.

Further, the angle detection unit AS has a notification unit AS2 for notifying information regarding angle data, that is, an angle (measurement angle) formed by the first and second members 20 and 30. For example, the notification unit AS2 outputs a beep sound each time the engagement position between the engagement portion 32 and the recess 23 changes. Further, the notification unit AS may have a panel for displaying the measurement angle. Therefore, by having the notification unit AS2, the measurer can easily grasp the measurement angle.

Further, the angle detection unit AS has a transmission unit AS3 that transmits angle information to the outside. Since the angle detection unit AS has an external transmission function, the angle measured by the angle meter 10 can be output to an external device. For example, examples of the external device connected to the goniometer 10 include a display that displays the measurement angle, a computer or a smartphone on which an application that displays or analyzes the measurement angle is installed, and the like.

In this embodiment, the case where the goniometer 10 functions as a joint goniometer has been described. However, the protractor 10 can also be used as a protractor for measuring other angles. For example, by providing the recess 23 at a position corresponding to the required resolution, it is possible to configure the angle meter 10 having high operability and angle graspability that satisfies the requirements as a product.

Further, in this embodiment, the case where the first member 20 has a plurality of recesses 23 and the second member 30 has the engaging portion 32 has been described. However, the second member 30 may have a recess 23 and the first member 20 may have an engaging portion 32.

Further, in this embodiment, the case where the angle meter 10 has the angle detection unit AS has been described. However, the configuration of the angle detection unit AS is not limited to this. For example, the angle detection unit AS may have a potentiometer having a gear 24 of the first member 20 as a shaft. Further, in this embodiment, the case where the angle meter 10 has the angle detection unit AS has been described, but the angle meter 10 does not have to have the angle detection unit AS.

Further, in this embodiment, a case where the angle detection unit AS stores the measurement data for a plurality of times in the storage unit AS1 has been described. However, the angle detection unit AS may notify and transmit the measured data without storing it in the storage unit AS1. For example, when the angle meter 10 is connected to an external device (for example, a smartphone) for measurement, the angle detection unit AS provides a buffer required from the detection of the angle to the transmission of the measurement data by the transmission unit AS3. You just have to have it. Therefore, for example, the angle detection unit AS may have at least the transmission unit AS3.

Further, in the present embodiment, the case where the angle meter 10 has the shaft member 40 has been described, but the angle meter 10 does not have to have the shaft member 40. The goniometer 10 may have a first member 20 and a second member 30 that rotate relative to each other around the rotation axis AX.

Further, the configurations of the substrates 21 and 31 of the first and second members 20 and 30 are not limited to this. For example, the substrates 21 and 31 do not have to have the handle portions H1 and H2. Further, for example, the substrate 21 may not have the recess 21B, the pin 25, and the scale M. Further, the substrate 31 does not have to have the recess 31B and the groove 31C.

Further, in this embodiment, the case where the recess 23 is a wavy uneven surface provided on the side surface of the annular structure 22 has been described. However, the configuration of the recess 23 is not limited to this. For example, the recesses 23 are not limited to the case where they are arranged at predetermined angular positions, that is, at predetermined intervals. For example, the recesses 23 may be arranged at relatively small intervals in a predetermined angle range, and the recesses 23 may be arranged at relatively large intervals in other angle ranges, depending on the portion to be measured.

Further, each of the recesses 23 may have different sizes (width, depth, etc.) from each other. For example, among the plurality of recesses 23, the recess 23 provided in a predetermined angle range may have a relatively large size, and the recess 23 provided in another angle range may have a smaller size. .. Further, for example, among the plurality of recesses 23, the recess 23 provided at a predetermined angle position (for example, the position corresponding to the measurement angle of 30 degrees and 60 degrees) has a relatively large size, and the other recesses 23 have a relatively large size. It may have a smaller size. By arranging the recesses 23 having different sizes according to the position and range, the click feeling given to the measurer changes. Therefore, the measurement angle can be recognized more clearly.

Further, in this embodiment, the case where the recess 23 is provided on the outer side surface in the radial direction of the annular structure 22 has been described. However, the recess 23 may be provided on the inner side surface of the annular structure 22 in the radial direction. In this case, the engaging portion 32 may be arranged inside the annular structure 22 in the radial direction, and the engaging convex portion 32C may be provided toward the outside in the radial direction. By providing the recess 23 on the outer side in the radial direction of the annular structure 22, the size of the substrate 21 and the size of the first member 20 can be reduced.

Further, in the present embodiment, the case where the recess 23 is provided in the annular structure 22 has been described, but the configuration of the recess 23 is not limited to this. The recess 23 may be provided in the first member 20. For example, a convex portion may be provided on the main surface 21A of the substrate 21, and a concave portion 23 may be provided on the side surface region on the outer side in the radial direction of the rotation axis AX in the convex portion. That is, when the recess 23 is provided on the outer side in the radial direction of the rotation axis AX, the recess 23 may be provided on the substrate 21.

Further, the engaging convex portion 32C of the engaging portion 32 may protrude from the main surface 31A of the base 31 toward the base 21 of the first member 20, for example.

Further, the case where the angle meter 10 has a recess 23 at a predetermined angle position as an engaged portion to be engaged with the engaging portion 32 and the engaging portion 32 has an engaging convex portion 32C has been described. However, if the goniometer 10 has a plurality of structural portions provided along the circumferential direction of the rotation axes AX of the first and second members 20 and 30, and an engaging portion engaged with the structural portions thereof. good.

FIG. 7A is a schematic top view of the angle meter 10A according to the modified example of the first embodiment. FIG. 7B is a cross-sectional view taken along the line VV of FIG. 7A. In FIG. 7A, the convex portion 23A and the other members of the engaging portion 35 are not shown.

In this modification, as shown in FIG. 7B, in the angle meter 10A, the first member 20 has a convex portion 23A instead of the concave portion 23. The convex portion 23A is a protrusion protruding from the main surface 21A of the substrate 21 in the direction along the rotation axis AX. Further, the second member 30 has an engaging portion 35 having an engaging concave portion 35A that engages with the convex portion 23A instead of the engaging portion 32. Members having an engaging relationship with each other, such as the angle meter 10A according to the present modification, may be provided on the first member 20 and the second member 30.

In other words, the first member 20 is a plurality of structural portions (for example, concave portions 23 or convex portions) provided along the circumferential direction of the rotation axis AX, which is the rotation axis of the first and second members 20 and 30. It suffices to have 23A). Then, the second member 30 has an engaging portion (for example, an engaging portion 32 or 35) that rotates around the rotation shaft AX together with the second member and engages with any of the plurality of structural portions. You just have to do it.

Further, when the recesses 23 are provided as the plurality of structural portions, for example, the first member 20 is provided on the main surface 21A facing the second member 30 of the substrate 21, and is annular along the circumferential direction of the rotation axis AX. The annular structure 22 may include a plurality of recesses 23 provided on the radial outer side surface of the rotation axis AX in the annular structure 22. Further, when a wavy uneven surface is provided as the plurality of structural portions, for example, the plurality of structural portions may have a wavy uneven surface provided on the side surface of the annular structure 22.

Further, when the engaging portion 32 is urged to the plurality of structural portions, the engaging portion 32 is not limited to the structure using the cantilever spring structure by the arm portion 32B described above. For example, the engaging portion 32 may have a cantilever spring having one end fixed to the second member 30 and the other end abutting on the plurality of structural portions. Further, for example, the engaging portion 32 may have a structure in which the engaging convex portion 32C abuts on the concave portion 23 by a coil spring.

Further, the engaging portion 32 is not limited to having the engaging structure (for example, the arm portion 32B), and for example, a part or the whole thereof may be formed of an elastic body. Further, in addition to the engaging portion 32, or instead of the engaging portion 32, a part or all of the plurality of structural parts may be formed of an elastic body. For example, the engaging portion 35 shown in this modification may be entirely composed of an elastic body. By rotating the engaging portion 32 or 35 while being urged by the structural portion, it is possible to stably give a click feeling to the measurer.

As described above, the goniometer 10 includes a first member 20 and a second member 30 that are relatively rotatable about the axis AX. Further, the first member 20 has a plurality of structural portions (recesses 23) provided along the circumferential direction of the rotation axis AX. Further, the second member 30 has an engaging portion (engaging portion 32) that engages with any one of the plurality of structural portions. Therefore, it is possible to provide the goniometer 10 which can be easily operated and can easily grasp the angle value.

10, 10A Protractor 20 First member 30 Second member 23 Recess (structural part)
32 Engagement part

Claims (11)

Includes a first member and a second member that are relatively rotatable about each other around the axis of rotation.
The first member has a plurality of structural portions provided along the circumferential direction of the rotation axis.
The second member has an engaging portion that engages with one or two distant pieces of the plurality of structural parts.
The engaging portion has two cantilever springs fixed to the second member and extending in opposite directions in the circumferential direction of the rotation axis, and from each of the two cantilever springs in the radial direction of the rotation axis. An angle meter characterized by having a protrusion that engages with one or two apart of the plurality of structural portions . The goniometer according to claim 1, wherein the convex portion is urged against the plurality of structural portions. The goniometer according to claim 1 or 2, wherein at least one of the plurality of structural portions and the engaging portion is made of an elastic body. One of claims 1 to 3, wherein the first member is provided on a main surface facing the second member and has an annular structure extending in an annular shape along the circumferential direction of the rotation axis. The goniometer described in one. The plurality of structural portions are a plurality of recesses provided on the radial outer side surface of the rotation axis in the annular structure.
The two cantilever springs have two arm portions extending in opposite directions in the circumferential direction of the rotating shaft, and the convex portion is radially inside the rotating shaft from each end of the two arm portions. The goniometer according to claim 4, wherein the angle meter is characterized in that it protrudes into a. The plurality of structural portions are a plurality of recesses provided on the radial inner side surface of the rotation axis in the annular structure.
The two cantilever springs have two arm portions extending in opposite directions in the circumferential direction of the rotating shaft, and the convex portion is radially outward of the rotating shaft from each end of the two arm portions. The goniometer according to claim 4, wherein the angle meter is characterized in that it protrudes into a. The goniometer according to claim 5 or 6 , wherein the plurality of structural portions include a wavy uneven surface provided on the side surface of the annular structure. The goniometer according to any one of claims 1 to 7, wherein the second member has an angle detection unit that electrically detects an angle formed by the first and second members. The angle detection unit is
A first gear provided on the first member and coaxially provided with the rotating shaft,
The angle meter according to claim 8, further comprising a potentiometer having a second gear as a shaft, which is provided on the second member and rotates by meshing with the first gear. The goniometer according to claim 8 or 9, wherein the angle detection unit has a notification unit for notifying angle data indicating the detected angle. The goniometer according to any one of claims 8 to 10, wherein the angle detection unit includes a transmission unit that transmits angle data indicating the detected angle to the outside.

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