JP3376983B2 - Maximum displacement detector - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a maximum value detection device used to detect the maximum value of a physical quantity to be detected in a history, and particularly to a maximum value detection device which occurs in a structure such as a building structure or a bridge due to an external force such as an earthquake. The present invention relates to a maximum displacement amount detection device suitable for detecting the maximum value of displacement history.

[0002]

2. Description of the Related Art Various displacement sensors have been proposed which are capable of detecting the largest amount of displacement in the past among displacements of structures such as building structures and bridges caused by an external force such as an earthquake.

For example, in Japanese Unexamined Patent Publication No. 6-331581, a plurality of conductive elements are arranged side by side and the conductive elements are proportionally broken according to the degree of load applied to a structure. , A method of knowing the maximum value of displacements that have occurred in the past is disclosed.

That is, the above disclosed technique detects a load detection sensor using a plurality of sensing elements having a constant destruction characteristic and a constant conduction characteristic in parallel so that a strain proportional to the strain generated in the detection target material is generated. Combine with the target material and fix it with an adhesive, etc., and quantitatively detect the past load level (strain / displacement amount) from the irreversible change in electrical resistance caused by the destruction of each sensing element due to strain, etc. It was done like this.

As another example, JP-A-8-1787.
In Japanese Patent Publication No. 65, a plurality of conductive elements are arranged side by side,
While folding back each conductive element at the middle part,
The bending means is provided with a relatively movable cutting means, and the shape of the cutting tool of the cutting means is a structure in which the conductive elements arranged in a horizontal line are sequentially cut according to the movement amount of the target structure. It is disclosed that the movement amount is detected based on the degree of.

[0006]

SUMMARY OF THE INVENTION In any of the above disclosed techniques, the structure is constructed by breaking the conductive element according to the amount of deformation caused by an external force such as an earthquake acting on a structure such as a building structure or a bridge. This is a method of detecting the maximum value of the deformation amount of an object.

However, these detection methods depend on the setting of the degree of slack of each conductive element and the setting conditions of tensile strength.
There may be cases where the sequential destruction or cutting of each conductive element depending on the amount of deformation in the detection target material is not always performed accurately, and the variations in these setting conditions greatly affect the stability and reliability of the detection accuracy of the detection sensor itself. I was affected. Further, in this configuration, since the value between the respective conductive elements to be broken cannot be detected, there is a possibility that a large error may occur in the measured value depending on the configuration of the conductive elements. In order to improve the detection accuracy, it is sufficient to arrange the conductive elements densely. However, this increases the size of the detection sensor itself and complicates the structure, resulting in high cost.

Further, although the above method can detect the displacement amount of the structure in the extension direction (tensile direction), it is difficult to detect the displacement amount in the compression direction due to the structure of the detection sensor.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a maximum displacement amount detecting device which has a simple structure and which can be reduced in size and weight.

[0010]

That is, in order to solve the above-mentioned problems, in the present invention according to claim 1, the maximum displacement amount detecting device has a movable member guided along a straight line to be measured. A position holding mechanism that stores a displacement amount of an object, a displacement transmission mechanism that transmits only a maximum displacement amount in a history among displacements of the measurement target in one direction to the movable member, and the position holding mechanism stores the displacement amount. The position holding mechanism.
Is a first member having a plurality of concavo-convex portions arranged in a row in the moving direction,
A second member having a claw-shaped portion that can be engaged with these uneven portions;
And the first member and the second member are in contact with each other
As you can see, it has a suitable elastic pressing force
And, in the first member or the second member,
One of them is a movable member, and the measurement object is in one direction.
Of the first member and the second member
When the claw-shaped parts of the members slide together,
And the claw-shaped portion meshes with the uneven portion,
The moving position of the movable member is maintained, and
It is characterized by remembering the quantity .

Further, in the present invention as set forth in claim 2, the displacement transmission mechanism flexes a part of an object to be measured or a member fixed to the object to be measured and an end of a movable member of the object to be measured. It is characterized by being configured by connecting with a sex-like body.

Further, in the present invention as set forth in claim 3, the displacement transmitting mechanism abuts a part of an object to be measured or a member fixed to the object to be measured and an end of a movable member of the object to be measured. Alternatively, it is characterized by being arranged close to each other.

[0013]

[0014]

[0015]

[0016]

Further, in the present invention as set forth in claim 4 , as the displacement detecting means, a change in displacement amount is a change in resistance, a change in capacitance, a change in inductance, or a combination thereof. It is characterized by using a converter for things.

Further, in the present invention as set forth in claim 5 , a scale indicating mechanism composed of a main scale and a vernier scale is used as the displacement detecting means, and the displacement amount of the object to be measured is indicated on the scale. It is characterized by that.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a maximum displacement amount detecting device according to the present invention will be described below with reference to the drawings.

1 to 7 are basic configuration diagrams according to the first embodiment of the present invention. First, referring to FIG. 1, reference numeral K in FIG. 1 is an object to be measured such as a structural body, and is, for example, a pillar / wall / beam / brace of a structure / house / building.
Or a composite of them. A fixed member K1 and a fixed member K2 are provided at arbitrary two points on the measurement object K, and a fixed point K1 is set to a gauge point A and a fixed member K2 is set to a gauge point B.

Reference numeral 1 is a first rod (rod) which is attached to the gauge point A of the fixing member K1 and transmits the displacement amount of the gauge point A in the left-right direction. It is arranged on the straight line connecting B.

Reference numeral 2 is a second rod (rod) attached to the reference point B of the fixing member K2, the left end of which is connected to the side portion of the housing 4. Further, in the housing 4, a position holding mechanism 10 for holding and storing a lateral displacement amount between the reference point A and the reference point B, and the position holding mechanism 10.
Displacement detecting means 3 is provided for detecting the amount of displacement held and stored by.

Here, the position holding mechanism 10 will be described. The position holding mechanism 10 is shown in FIGS.
As shown in the basic configuration diagram of (b), a guide member 14 having a guide portion 11 formed by a horizontally long insertion hole and the like, a movable portion 12 capable of moving the guide portion 11 with appropriate sliding friction, and this movable portion. The transmission member 13 is fixed to the portion 12 and transmits displacement information to the movable portion 12. Reference symbol M in the figure is a member for transmitting the displacement amount generated in the measuring object K to the transmission member 13, and corresponds to the first rod 1 shown in FIG.

In the above configuration, one direction (rightward in this example)
Displacement information, the displacement information from the member M is the transmission member 13
Is transmitted to the guide member 14 as a linear displacement amount of the movable portion 12, and is held at the maximum moving position by an appropriate sliding frictional force of the movable portion 12. On the other hand, in the displacement in the opposite direction (leftward in this example), the member M is the transmission member 1
3, the displacement information is not transmitted to the transmission member 13. That is, this structure can hold the maximum displacement amount in one direction. Therefore, the movable portion 12 of the position holding mechanism 10 may have sensors or switches (for example, sliding resistors or potentiometers) whose output or operation is changed by linear movement of an electrode or a handle, or a scale display mechanism described later. By connecting to the displacement detecting means 3, it is possible to detect the maximum displacement amount of one of the displacements of the measuring object K during the history. Further, in order to reverse the direction of the transmissible displacement, the arrangement of the member M in FIG. 7A may be changed as shown in FIG. 7C. 1 to
In FIG. 6, the displacement detecting means 3 and the position holding mechanism 10 are shown in an integrated form.

In the embodiment shown in FIG. 1, the right end of the first rod 1 inserted into the housing 4 through the through hole 4a has a flexible string-like body W (for example, a string, a wire, etc.) as a displacement transmitting mechanism. It is connected to the transmission member 13 of the displacement detecting means 3 attached to the housing 4 via a ribbon, a chain, a magic hand, etc.).

Next, the operation of this embodiment will be described. In the above configuration, when the measuring object K receives an external force such as an earthquake and is distorted / deformed in the compressing or tensile direction due to the stress at that time, the measuring object K between the gauge points A and B is displaced.
This displacement acts on the housing 4 via the first rod 1 from the gauge point A, but the displacement in the right direction (compression direction) from the first rod 1 to the housing 4 side causes the cord W to bend. It is avoided by this, is diverged as a relative movement between the housing 4 and the first rod 1, and is not transmitted to the housing 4 side. On the other hand, when the displacement amount in the left direction (pulling direction) is larger than the maximum displacement amount in the past, the string-shaped body W is strained and the string-shaped body W is used to displace the case. 4 is transmitted to the movable portion 12 as a linear displacement amount by moving the transmission member 13 and is held and stored at the maximum moving position by an appropriate sliding frictional force of the movable portion 12 at that time. In this way
The position information once held is held by the frictional action of the position holding mechanism 10 unless the measurement object K shows further extension, and the displacement detecting means 3 detects the amount of displacement corresponding to the holding position. For example, when a sliding resistor is used as the displacement detecting means 3, a resistance change according to the amount of movement of the movable portion 12 occurs at the output terminal thereof.

As described above, in the present configuration, the maximum displacement amount of the displacement (that is, the tensile stress) to the left of the first rod 1 among the displacements generated in the measuring object K is detected by the displacement detecting means 3. Is detected.

Hereinafter, some embodiments of the first embodiment different from the above will be described.

In the embodiment shown in FIG. 2, the distal end portion of the first rod 1 is L-shaped and is arranged on the right side of the transmission member 13 to form another displacement transmission mechanism in place of the cord W. is there. That is, in the present embodiment, when the displacement in the right direction (compression direction) from the first rod 1 to the housing 4 side is L,
The die contact portion 1a is arranged so as to move away from the transmission member 13 and the L-shaped contact portion 1a approaches / contacts the transmission member 13 with respect to displacement in the left direction (pulling direction).

In the above structure, when the object K to be measured is displaced in the compression direction, the L-shaped contact portion 1a of the first rod 1 is moved away from the transmission member 13 in the right direction, and no force is applied to the transmission member 13. Although not added, when the measurement object K is displaced in the pulling direction, if the displacement amount at that time exceeds the maximum value of the past displacement amount, the L-shaped contact portion 1a contacts the transmission member 13. The movable part 12 moves to the left.

Further, the embodiment of FIGS. 3 and 4 is the first embodiment.
The rod 1 and the displacement detection means 3 (position holding mechanism 10) are connected via a displacement transmission mechanism, and the object to be measured K is measured.
The displacement detecting means 3 itself moves in a linear direction by the displacement of
At that time, the displacement is transmitted to the movable portion 12 by contacting the transmission member 13 with the stopper member 15 fixed to the housing 4.

That is, when the measurement object K is displaced in the compression direction, no force is applied to the transmission member 13, but when the measurement object K is displaced in the tension direction, the displacement amount at that time is the past. If the displacement exceeds the maximum value, the transmission member 13 contacts the right side surface of the stopper member 15 and the movable portion 12 moves to the right.

Next, in the embodiment of FIGS. 5 and 6, the displacement detecting means 3 (position holding mechanism 10) is connected to the second rod 2 so that the displacement at the gauge point B is directly transmitted to the displacement detecting means 3. It is composed. 1 to 4 is configured such that the left end of the second rod 2 is connected to the housing 4 and the displacement of the gauge point B is transmitted to the displacement detecting means 3 via the housing 4. It is different from what you did,
The operation is the same in both configurations. FIG. 5 shows an example using the displacement transmission mechanism by the cord W, which corresponds to FIG. 1, and FIG. 6 shows an example using the displacement transmission mechanism by the L-shaped contact portion 1a, which corresponds to FIG.

As described above, in the position holding mechanism 10 according to the first embodiment, the sliding portion of the displacement detecting means 3 which operates by linear movement is connected to the movable portion having appropriate sliding friction. However, the sliding portion of the displacement detecting means 3 may be directly provided with a frictional force by using auxiliary means such as tightening of the sliding portion.

Next, a more specific embodiment of the maximum displacement amount detecting device equipped with the position holding mechanism 10 having the above-described structure will be described with reference to FIGS.

FIG. 8 is a schematic configuration diagram of the maximum displacement amount detecting device according to the present invention, which is an embodiment for detecting the maximum displacement amount in the extending direction (pulling direction) of the structural member K as an object to be measured.

In FIG. 8, the piston 2 which is a movable member.
1 is fitted into the cylinder 23 to form a position holding mechanism which will be described later, and the piston end 21a at the right end thereof is connected to the actuating metal fitting 25 fixed to the structural member K by the thin connecting cord 27 having high flexibility. A displacement transmission mechanism is configured.
The cylinder 23 is fixed to the structural member K by a cylinder mounting member 26, and plays a role as a guide member for the piston 21 to perform linear movement.
An opening 23b is provided at the bottom of the cylinder 23, and air is allowed to flow in and out of the opening 23b, so that the piston 21 fitted in the cylinder 23 can smoothly move in the left-right direction.

Further, a sliding resistor 24 used as a displacement detector is attached to the outer periphery of the cylinder 23, and a sliding piece 24a of the sliding resistor 24a is provided on the side surface of the cylinder 23.
It projects from a and is fixed to the piston 21. Therefore, when the position of the piston 21 changes, the sliding piece 24a of the sliding resistor 24 moves, and an output change (change in resistance value in this embodiment) is obtained at the terminal 24b according to the amount of movement.

By the way, on the outer circumference of the piston 21,
An O-ring 22 made of rubber, for example, is attached as a friction member with the cylinder 23. This O-ring 22
When the piston 21 is fitted into the cylinder 23, it is pressed against the inner wall of the cylinder 23 and elastically deforms, and the elastic force presses the inner circumference of the cylinder 23 with a constant force at all times. A Coulomb frictional force is generated between the piston 21 and
Acts as a resistance force to hold the present position. The holding force can be arbitrarily adjusted by selecting the size and material of the O-ring 22 and changing the magnitude of the Coulomb frictional force. The cylinder 23 and the piston 21 with the O-ring 22 constitute a position holding mechanism according to the first embodiment of the present invention that utilizes Coulomb frictional force. still,
In this embodiment, the rubber O-ring 22 is used as the friction member that generates the Coulomb frictional force, but the friction member is not limited to this.

Next, the operation of this embodiment will be described. In the above configuration, when the structural member K is displaced in the pulling direction due to an external force such as an earthquake, the mounting position P of the cylinder mounting bracket 26
1 (corresponding to the control point B) and the mounting position P2 of the operating bracket 25
It moves relatively away from (corresponding to the reference point A). The working metal fitting 25 and the piston end 21a of the piston 21
Are connected by the connecting cord 27, the magnitude of the tensile force applied to the piston 21 via the connecting cord 27 depends on the O-ring 2.
When the Coulomb frictional force due to 2 is exceeded, the piston 21 moves in the + X direction. The structural member K is usually an elastic body, and the displacement of the structural member K returns to the original position when the external force is removed.
Does not transmit the displacement in the compression direction, the piston 21 is held in the same position. As a result, the displacement amount of the structure K is stored as the position of the piston 21.
At this time, the connection string 27 is loosened when the structural member K is restored to its original position.

In this state, even if a force in the pulling direction is applied to the structural member K again, the connecting string 27 is kept slack unless the structural member K is displaced beyond the amount of movement of the piston 21 described above. The piston 21 is held in the same position. Therefore, the piston 21 always holds the maximum displacement amount generated in the past among the displacements in the pulling direction.

When a force in the compressive direction acts on the structural member K, the mounting position P1 of the cylinder mounting member 26 and the mounting position P2 of the actuating member 25 move in a direction relatively approaching each other. Since the displacement in the compression direction is avoided by loosening the connecting cord 27, the position of the piston 21 does not change.

Further, the sliding resistor 2 is provided on the piston 21.
Since the sliding piece 24a of No. 4 is connected, the piston 21
Is moved, the output of the terminal 24b changes according to the amount of movement. Therefore, its output value (resistance value)
A predetermined measuring device (not shown) as electric information of the displacement amount
By inputting into, it is possible to quantitatively detect the maximum displacement of the structural member K.

Next, some embodiments different from the above will be described. FIG. 9 shows an embodiment in which the maximum value of the displacement amount of the structural member K in the compression direction is detected.

This embodiment is substantially the same as FIG. 8 described above, and is different only in the structure of the displacement transmitting mechanism. That is, in this displacement transmission mechanism, the L-shaped metal fitting 28 is attached to the piston end portion 21a of the arranged piston 21, and the operating metal fitting 2
5 and the L-shaped metal fitting 28 are connected by a flexible connecting cord 27.

In the displacement transmitting mechanism having the above-mentioned structure, since the connecting cord 27 is attached to the L-shaped metal fitting 28 extended in the + X direction with respect to the mounting position of the actuating metal fitting 25, the structural member K is pulled in the pulling direction. Connection string 27 when displaced
However, when the structural member K is displaced in the compression direction, if the displacement amount exceeds the maximum value of the past displacement amount, the connecting string 27 will be tense. By this, the force is transmitted to the piston 21, and the piston 21 moves in the -X direction. Then, as described above, since the position of the piston 21 is held by the Coulomb frictional force exerted by the position holding mechanism, the position of the piston 21 indicates the maximum value of the compression displacement amount that has occurred in the structural member K in the past. Become.

Next, the displacement transmitting mechanism shown in the embodiment of FIG. 10 does not use the connecting cord 27 for connecting the piston 21 and the operating fitting 25, but the piston end 21a and the operating fitting 25.
It was realized by the mounting relationship with. That is, in this example, when the structural member K is stretched, the piston end 2
The actuating metal fitting 25 is arranged close to the right side of the piston end 21a so as to contact the piston end 21a when the structural member K is compressed away from the la 1a.

In the above structure, when the structural member K is displaced in the pulling direction, the actuating metal fitting 25 moves away from the piston end 21a and no force is applied to the piston 21, but the structural member K is displaced in the compression direction. In such a case, if the amount of displacement at that time exceeds the maximum value of the amount of displacement in the past, the actuating metal fitting 25 contacts the piston end portion 21a of the piston 21, and the piston 21 moves in the -X direction. Thereby, the maximum value of the displacement amount of the structural member K in the compression direction can be detected.

Further, in the displacement transmission mechanism shown in the embodiment of FIG. 11, the embodiment of FIG.
1a is arranged close to the right side, whereas the actuating metal fitting 25 is arranged on the piston neck 21b side of the piston 21 to detect the maximum displacement of the structural member K in the pulling direction. Is.

That is, in this configuration, when the structural member K is displaced in the compression direction, the actuating metal fitting 25 causes the piston end portion 21 to move.
When the structural member K is displaced in the pulling direction, the displacement amount at that time exceeds the maximum value of the displacement amount in the past, although the force is not applied to the piston 21 from the position a in the -X direction. The actuating metal fitting 25 comes into contact with the left side of the piston end portion 21a to move the piston 21 in the + X direction. Accordingly, the maximum value of the displacement amount of the structural member K in the pulling direction can be detected.

By the way, in the measurement of the physical quantity to be detected, not only the above-mentioned detection of the deformation quantity of a building or a structure such as a bridge but also any physical quantity capable of being converted into a displacement can be used. Can also be applied, for example, the present invention can be applied to the maximum value measurement of temperature, humidity and the like. Hereinafter, an example in which the present invention is applied to the measurement of the maximum temperature will be described with reference to FIG.

As shown in FIG. 12, in this application example, a bimetal 29 is arranged near the piston 21, and the maximum temperature during the history is detected. The bimetal 29 is to bend two kinds of metals having different thermal expansion coefficients according to the temperature change, so that the tip of the bimetal 29 constitutes a position holding mechanism. 21 piston head 2
By arranging in the vicinity of 1a, the maximum temperature during the history is set to the bending amount of the bimetal 29, that is, the piston 21
Can be held and stored as the moving position of the.

As described above, in the first embodiment, the piston 21 with the O-ring 22 that uses the cylinder 23 as a guide member is used as a specific example of the position holding mechanism, and the position transmitting mechanism operates as a displacement transmitting mechanism. An example in which the maximum amount of displacement during the history is detected by using the metal fitting 25 or a combination of the operating metal fitting 25 and the connecting cord 27 has been described. However, as the position holding mechanism, as in the first embodiment. The configuration is not limited to the use of the Coulomb frictional force generated between the O-ring 2 mounted on the piston 1 and the cylinder 3, and in short, the Coulomb frictional force is generated in the movable member by using the slide guide mechanism. Any structure may be used as long as a friction member is appropriately provided.

Also, an example in which the amount of displacement stored / held in the position holding mechanism is detected as a resistance change by using a sliding resistor has been shown, but the present invention is not limited to this, and the capacitance or capacitance may be changed as appropriate. Of course, it does not matter even if it is converted into inductance or the like for detection.

The amount of displacement is determined by the terminal 24 of the displacement detector 24.
By connecting a measuring device to b, it can be taken out as electrical information, but it is not always necessary to provide electrical wiring at all times, and the measuring device may be connected whenever necessary.

Next, the second embodiment of the present invention will be described with reference to FIGS.
A maximum displacement amount detection device according to the embodiment will be described.

This configuration is the same as that of the above-described first embodiment, and holds and stores the displacement amount in the left-right direction between the gage mark A and the gage mark B transmitted by the above-mentioned displacement transmission mechanism in the housing 4. A position holding mechanism 30 for performing the operation and a displacement detection means 3 for detecting the amount of displacement held by the position holding mechanism 30 are provided.

Here, in the position holding mechanism 30 according to the second embodiment, as shown in the basic configuration diagram shown in FIGS. 15 (a) and 15 (b), the sensor and the output and the operation of which are changed by the rotation of the main shaft. A displacement detection mechanism 33 including switches (for example, a rotary potentiometer) and a scale display mechanism capable of recognizing the amount of rotation of the main shaft on a scale display, and a displacement detection mechanism 33 connected to the main shaft to rotate with an appropriate frictional force. A movable part 31 that is movable,
The displacement information is fixed to the movable portion 31 and the displacement information is stored in the movable portion 31.
And a transmission member 32 that transmits the In addition, the symbol M in the figure indicates the amount of displacement generated in the measuring object K.
And a member corresponding to the first rod 1 shown in FIGS. 13 and 14 described later.

In the position holding mechanism 30 having the above structure, the displacement information from the member M is rotated in one direction (rightward in this example) by rotating the transmission member 32, and the displacement detecting mechanism 33 is moved through the movable portion 31. Is transmitted to the main spindle as the amount of rotation,
The main shaft is held at its maximum position by an appropriate frictional force of the movable portion 31. On the other hand, in the opposite direction (leftward in this example), the member M moves away from the transmission member 32, and the displacement information is not transmitted to the transmission member 32. That is, this configuration can hold the maximum displacement in one direction. still,
FIG. 15C is an example in which the displacement transmission direction is reversed.

A second embodiment of the maximum displacement amount detecting device equipped with the position holding mechanism 30 having the above construction will be described below with reference to FIGS. 13 and 14. In this embodiment, the position holding mechanism 30 can be arranged in the same manner as in FIGS. 1 to 6 in the above-described first embodiment, but here, two examples as shown in FIGS. 13 and 14 will be described. . 13 corresponds to FIG. 1,
FIG. 14 corresponds to FIG. 2, and in the following description, the same or equivalent parts as those in the first embodiment are designated by the same reference numerals.

In the embodiment shown in FIG. 13, the right end of the first rod 1 inserted into the housing 4 through the through hole 4a is attached to the housing 4 via a string W as a displacement transmission mechanism. It is configured to be connected to the transmission member 32 of.

In the above structure, when the measuring object K receives an external force such as an earthquake and is distorted or deformed in the compressing or tensile direction due to the stress at that time, the measuring object K between the gauge points A and B is measured.
Displacement occurs. This displacement acts on the casing 4 via the first rod 1 from the gauge point A, but the displacement in the right direction from the first rod 1 to the casing 4 side is avoided by the bending of the cord-like body W. Since it is diverged as a relative movement between the housing 4 and the first rod 1, it is not transmitted to the housing 4 side. On the other hand, with respect to the displacement in the left direction, if the displacement amount exceeds the maximum value of the displacement amount in the past, the cord W is tensioned and transmitted to the housing 4 side, and the transmission is performed. By rotating the member 32, it is transmitted to the movable portion 31 (main shaft of the displacement detecting means 3) as a rotary motion, and the rotational position of the main shaft is held / stored at the maximum angle due to appropriate rotational friction at that time. In this way, the position information once held is held by the frictional action of the position holding mechanism 30 unless the measurement object K shows further extension, and the maximum displacement amount is detected by the displacement detecting means 3. To be done. For example, when a rotary potentiometer is used as the displacement detecting means 3, a resistance change according to the amount of rotation of the main shaft occurs at its output terminal.

As described above, in the present configuration, among the displacements generated in the measuring object K, only the displacement to the left of the first rod 1 (that is, the tensile stress) is detected by the displacement detecting means 3.

Next, in the embodiment shown in FIG. 14, without using the string-like body W as shown in FIG. 13, the tip end portion of the first rod 1 is L-shaped, and its abutting portion 1a is on the right side of the transmission member 32. It was placed in. That is, in the present embodiment, the L-shaped contact portion 1a moves away from the transmission member 32 with respect to the rightward displacement from the first rod 1 to the housing 4, and the L-shaped contact portion 1a with the leftward displacement is L. The die contact portion 1 a is arranged so as to be close to the transmission member 32.

In the above structure, when the measurement object K is displaced in the compression direction, the L-shaped contact portion 1a moves away from the transmission member 32 in the right direction, so that no force is applied to the transmission member 32. When the object K is displaced in the pulling direction and the displacement amount at that time exceeds the maximum value of the past displacement amount, the L-shaped contact portion 1a contacts the transmission member 32, and the movable portion 31 (displacement). The main shaft of the detection means 3) rotates according to the amount of displacement.

By the way, in the position holding mechanism 30 in the second embodiment, the structure in which the movable portion having an appropriate frictional force is connected to the main shaft of the displacement detecting means which operates by the rotation of the main shaft has been shown, but the present invention is not limited to this. Instead, it is of course possible to directly apply the rotational frictional force to the main shaft by using auxiliary means such as tightening of the main shaft.

Next, a maximum displacement amount detecting device according to the third embodiment of the present invention will be described with reference to FIGS. still,
In the following description, the same or equivalent parts as those in the first embodiment are designated by the same reference numerals.

First, referring to FIG. 16, the present configuration is the same as that of the first and second embodiments described above, and the left and right direction between the above-mentioned mark A and the mark B in the housing 4 is described. The position holding mechanism 40 configured as described above for holding and storing the displacement amount.
A displacement detector 3 for detecting the amount of displacement held by the position holding mechanism 40 is provided.

Here, the basic structure of the position holding mechanism 40 will be described. The position holding mechanism 40 in this embodiment has a large number of triangular concave and convex portions 42 in the moving direction as shown in FIG. A second member 43 in which a first member 41 that is continuously provided and a claw-shaped portion 44 that engages with the concave-convex portion 42 of the first member 41 are movably attached by a suitable elastic force with a support shaft 45 as a fulcrum. As shown in FIG. 22 (b), both members 41, 43 are combined so that the tip of the claw-shaped portion 44 abuts the hypotenuse of the concave-convex portion 42.

That is, in FIG. 22B, the first member 41 is displaced with respect to displacement in one direction (in this example, leftward direction).
The concave-convex portion 42 of the second member 43 and the claw-shaped portion 44 of the second member 43 are slidable and movable, and the claw-shaped portion of the second member 43 is displaced with respect to the displacement in the opposite direction (right direction). The reference numeral 44 cuts into the concave portion of the first member 41 and acts so as to prevent the movement of the first member 41.

In the third embodiment shown in FIG. 16, the first member 41 provided with the concave and convex portion 42 constituting the position holding mechanism 40 is a movable member and is inserted into the housing 4 through the through hole 4a. It is connected to the right end of the first rod 1 via a flexible connecting string W that constitutes the displacement transmission mechanism, and a claw-shaped portion 44 that engages with the uneven portion 42 is a casing with a support shaft 45 as a fulcrum. The structure is movably attached to the body 4 (corresponding to the second member 43 in FIG. 22), and the displacement detection means 3
The left end (the reference point A1 in the displacement detector 3) is fixed to the movable member side by the fixed member 5, and the right end (the reference point B1 in the displacement detector 3) is fixed in the proper position of the housing 4 by the fixed member 6. There is. A resistance element such as a sliding resistor or a sliding potentiometer is suitable as the displacement detecting means 3.

Next, the operation of this embodiment will be described. In the above configuration, when the measuring object K receives an external force such as an earthquake and is distorted / deformed in the compressing or tensile direction due to the stress at that time, the measuring object K between the gauge points A and B is displaced.
This displacement acts on the housing 4 from the gauge point A via the first rod 1, but the displacement in the right direction from the first rod 1 to the housing 4 side is avoided by the bending of the connecting string W, Since it diverges as a relative movement between the housing 4 and the first rod 1,
Although it is not transmitted to the housing 4, if the amount of displacement with respect to the leftward displacement exceeds the maximum value of the past displacement, the casing W is tensed by tensioning the connecting cord W. After being transmitted to the fourth side, the first member 41 moves leftward. Further, this displacement is transmitted to the left end (reference point A1) of the displacement detecting means 3 via the fixing material 5, and is held at the same position by the position holding mechanism 40.

Therefore, in this configuration, among the displacements generated in the measuring object K, to the right of the first rod 1 (that is,
The compressive stress) is not detected, and only the displacement (that is, the tensile stress) in the left direction with respect to the first rod 1 is detected by the displacement detecting means 3.

Further, by arranging the plurality of position holding mechanisms 40 by shifting the arrangement of the concave-convex portion 42, a more accurate position holding function can be realized. Further, by changing the setting direction of the claw-shaped portion 44 so that the tip of the claw-shaped portion 44 contacts the right hypotenuse of the concave portion, the holdable displacement direction can be reversed. However, in this case, it is necessary to change the arrangement of the connecting string W to the linear direction and reverse the direction of the displaceable displacement.

Hereinafter, some embodiments different from the above of the maximum displacement amount detecting device having the position holding mechanism 40 according to the third embodiment of the present invention will be described.

In the embodiment shown in FIG. 17, the first member 41 is used.
Is fixed to the housing 4 side, and the claw-shaped portion 44 is a movable member, and the operation is the same as that of the above-described embodiment.

Further, since the held / stored displacement amount can be known from the moving position of the movable member, FIG.
6, instead of the displacement detecting means 3 such as a sliding resistor as shown in FIG. 17, as shown in FIG. 18 and FIG.
The scale indicating mechanism 7 including the sub scale 7b may be attached so that the positional change of the movable member can be confirmed by the scale amount. For example, in the case of FIG. 18, the main scale 7a
Alternatively, one of the vernier scales 7b is attached to the first member 41 and the other is attached to the housing 4 side. By using such displacement detecting means 3, it is possible to detect the displacement amount without using an electric measuring device.

Next, in the embodiment shown in FIGS. 20 and 21, the right end of the displacement detecting means 3 is directly attached to the second rod 2 inserted into the housing 4 through the through hole 4b. Further, the uneven portion 42 of the first member 41 connected to the first rod 1 via the string-shaped body W is provided on the second rod 2.
A claw-shaped portion 44 that engages with is attached. Therefore,
In the embodiment shown in FIGS. 16 to 19, the displacement of the gauge point B is transmitted to the right end of the displacement detecting means 3 via the housing 4, whereas in the present embodiment, the displacement at the gauge point B is directly detected. It is transmitted to the right end of the means 3. Although not shown, in the present configuration, it is desirable that the housing 4 be supported by the measuring object K by some suitable mechanism.

By the way, the position holding mechanism 40 according to the third embodiment of the present invention is not limited to the above-mentioned mechanism, and modified examples as shown in FIGS. 23 and 24 can be considered.

As an example, as shown in FIG. 23 (a),
A first member 41 having a triangular wave-shaped uneven portion 42 continuously provided on the surface thereof.
And a second member 43 in which a claw-shaped portion 44 having several concaves and convexes of the same shape that engages with the concave-convex portion 42 is rotatably attached about a support shaft 45 as a fulcrum. Figure 2
The position holding mechanism 40 is configured by combining as shown in FIG. The claw-shaped portion 44 of the second member 43 maintains a state in which it is always in contact with the first member 41 with a moderate elastic pressing force by a mechanical force such as a spring or a spring, or a magnetic force. Is what you are doing.

In the above structure, with respect to the displacement in the left direction,
The concavo-convex portion 42 of the first member 41 and the claw-shaped portion 44 of the second member 43 are slidable and movable, and the concavo-convex portion of the claw-shaped portion 44 is displaced with respect to the displacement in the right direction. To prevent movement of the first member 41 by engaging with the first member 41.
The displacement amount only in the left direction at is stored and stored.

Further, as in another modification shown in FIG.
A first member 41 having a triangular wave-shaped uneven portion 42 continuously provided on the surface thereof.
Of course, it may be configured by a combination of the concavo-convex portion 42 and the second member 43 in which point-symmetrical triangular wave-shaped concavities and convexities 44 are continuously provided. In this case also, the first member 41 and the second member 41
The concave and convex portions of the member 43 are always brought into contact with each other with a proper elastic pressing force by a mechanical force such as a spring or a spring, or a magnetic force.

These position holding mechanisms 40 are the same as those shown in FIG.
6 to 21 can be applied in the same manner and the operation thereof is the same, and therefore, illustration and description of each are omitted. Further, also in the case of this configuration, the direction of the holdable displacement can be reversed by reversing the combination of the triangular wave-shaped irregularities. This makes it possible to measure the maximum displacement in the compression direction.

Next, a more specific embodiment of the position holding mechanism 40 will be described with reference to FIGS. 25 and 26.

The position holding mechanism shown in FIG. 25 is composed of a combination of a round rod-shaped sensor rod 51 and a ring-shaped leaf spring 53. The sensor rod 51 is a movable member, and a spiral groove 52 is provided at a predetermined position in the longitudinal direction. For example, the groove pitch is about 150 μm. The leaf spring 53 is a disk-shaped member made of elastic steel, and has three claw-shaped portions 54 with their ends facing the center. These claws 54
Are arranged at substantially equal intervals (about 120 degrees), and are bent so that the tips of the claws face slightly upward. By fitting the leaf spring 53 into the groove portion 52 of the sensor rod 51, one of the claw-shaped portions 54 abuts on the groove 52 to form a position holding mechanism.

In the combination of FIG. 25, the groove portion 52 and the claw-shaped portion 54 of the leaf spring 53 are different from each other because the claw-shaped portion 54 has elasticity with respect to the displacement of the sensor rod 51 in the arrow direction (rightward direction). It is possible to move due to slippage, and with respect to the displacement in the opposite direction (left direction), the claw-shaped portion 54 bites into the groove-shaped portion 52 and acts to prevent the movement of the sensor rod 51. It is possible to hold the displacement amount.

Here, in order to improve the accuracy of position holding, the number of the claw-shaped portions 54 of the leaf spring 53 may be increased, or a plurality of the leaf springs 53 may be displaced from each other. You may arrange multiple pieces like this. In addition, the groove 52
It is also possible to use a sensor rod 51 having only a smooth surface having no claws. In this case, since the claw-shaped portion 54 does not depend on the groove portion 52, the claw-shaped portion 54 of the claw-shaped portion 54 is not formed. Although the bite is slightly reduced, there is an advantage that the position can be maintained steplessly (continuously). Further, in this configuration, by changing the fitting direction of the leaf spring 53 to the sensor rod 51, the direction of the holdable displacement can be easily reversed.

FIG. 26 shows a state in which displacement detecting means is attached to the position holding mechanism. In FIG. 26, reference numeral 51 is a sensor rod, reference numeral 53 is a leaf spring fitted to the sensor rod, and reference numeral 57 is a leaf spring retainer for fixing and housing this leaf spring.

Reference numeral 55 is a half-divided cylinder connected to the leaf spring retainer 57, and has a groove portion (not shown) at the longitudinal center thereof.
Further, the sensor rod 51 is slidably arranged. For example, by providing a main scale (not shown) on the sensor rod 51 side and a sub scale 56 on the cylindrical body 55 side, it is possible to configure a displacement detecting means that can confirm the positional change of the sensor rod 51 with a scale amount. Further, as the displacement detecting means, not the scale indicating mechanism as described above, but the magnetic sensor 58 through which the sensor rod 52 penetrates as shown by a broken line in FIG.
Alternatively, the position change of the sensor rod 51 may be detected as a magnetic flux change or the like.

[0090]

As described above, according to the present invention,
Installation is easy because the structure of the detection device that detects the maximum value in the history of the amount of deformation caused by an external force such as an earthquake acting on a structure such as a building structure or a bridge can be simplified, and the size and weight can be reduced. This reduces costs and greatly contributes to improving safety management of structures.

Further, according to the present invention, by using the scale indicating mechanism as the displacement detecting means, the maximum value of the displacement amount can be recognized as the scale amount without intentionally using the electric measuring instrument, so that the displacement measuring work can be performed. It will be easy.

Further, according to the present invention, by using a sensor capable of detecting an instantaneous displacement such as a sliding resistor or a magnetic sensor as the displacement detecting means, the maximum value of the displacement amount can be calculated without using a constant power source. Since it can be confirmed remotely, displacement measurement work becomes easy.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a maximum displacement amount detection device according to a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram different from FIG. 1 of the maximum displacement amount detection device according to the first embodiment of the present invention.

FIG. 3 is a schematic configuration diagram different from that of FIG. 2 of the maximum displacement amount detection device according to the first embodiment of the present invention.

FIG. 4 is a schematic configuration diagram different from FIG. 3 of the maximum displacement amount detection device according to the first embodiment of the present invention.

FIG. 5 is a schematic configuration diagram different from FIG. 4 of the maximum displacement amount detection device according to the first embodiment of the present invention.

FIG. 6 is a schematic configuration diagram different from FIG. 5 of the maximum displacement amount detection device according to the first embodiment of the present invention.

FIG. 7 is a diagram showing a basic configuration of a position holding mechanism according to the first embodiment of the present invention.

FIG. 8 is a diagram showing a specific example of the maximum displacement amount detection device according to the first embodiment of the present invention.

FIG. 9 is a diagram showing a specific example different from FIG. 8 of the maximum displacement amount detecting device according to the first embodiment of the present invention.

FIG. 10 is a diagram showing a specific example different from that of FIG. 9 of the maximum displacement amount detecting device according to the first embodiment of the present invention.

FIG. 11 is a diagram showing a specific example different from FIG. 10 of the maximum displacement amount detecting device according to the first embodiment of the present invention.

FIG. 12 is a diagram showing a specific example different from FIG. 11 of the maximum displacement amount detection device according to the first embodiment of the present invention.

FIG. 13 is a schematic configuration diagram of a maximum displacement amount detection device according to a second embodiment of the present invention.

FIG. 14 is a schematic configuration diagram different from FIG. 13 of the maximum displacement amount detection device according to the second embodiment of the present invention.

FIG. 15 is a diagram showing a basic configuration of a position holding mechanism according to a second embodiment of the present invention.

FIG. 16 is a schematic configuration diagram of a maximum displacement amount detection device according to a third embodiment of the present invention.

FIG. 17 is a schematic configuration diagram different from FIG. 16 of the maximum displacement amount detection device according to the third embodiment of the present invention.

FIG. 18 is a schematic configuration diagram different from FIG. 17 of the maximum displacement amount detection device according to the third embodiment of the present invention.

FIG. 19 is a schematic configuration diagram different from FIG. 18 of the maximum displacement amount detection device according to the third embodiment of the present invention.

FIG. 20 is a schematic configuration diagram different from FIG. 19 of the maximum displacement amount detection device according to the third embodiment of the present invention.

FIG. 21 is a schematic configuration diagram different from FIG. 20 of the maximum displacement amount detection device according to the third embodiment of the present invention.

FIG. 22 is a diagram showing a basic configuration of a position holding mechanism according to a third embodiment of the present invention.

FIG. 23 is a view showing a basic configuration different from that of FIG. 22 of the position holding mechanism according to the third embodiment of the present invention.

FIG. 24 is a view showing a basic configuration different from that of FIG. 23 of the position holding mechanism according to the third embodiment of the present invention.

FIG. 25 is a diagram showing a specific example of the position holding mechanism according to the third embodiment of the present invention.

FIG. 26 is a view showing the assembly of the position holding mechanism shown in FIG. 25.

[Explanation of symbols]

3 Displacement detection means 7 Scale indication mechanism 7a Main scale 7b vernier scale 10, 30, 40 Position holding mechanism 12,31 Moving part 13, 32 Transmission member 21 Movable member (piston) 22 Friction member (O-ring) 23 cylinders 41 First Member 42 uneven part 43 Second member 44 Claw-shaped part K measurement object (structural member) W displacement transmission mechanism (string-shaped body)

─────────────────────────────────────────────────── --- Continuation of the front page (56) Reference JP-A-11-190624 (JP, A) JP-A-11-190625 (JP, A) JP-A-7-103747 (JP, A) JP-A-9- 196608 (JP, A) JP-B Sho 53-34927 (JP, B1) JP-B 36-8863 (JP, Y1) US Patent 4075889 (US, A) International Publication 98/41080 (WO, A1) (58) Search Areas (Int.Cl. ⁷ , DB name) G01B 21/00-21/32 G01B 5/00-5/30

Claims (5)

(57) [Claims] 1. A position holding mechanism that stores a displacement amount of a measurement target having a movable member that is movably guided along a straight line, and a maximum displacement of the measurement target in one direction during a history. is composed of a displacement transmission mechanism for transmitting an amount only in the position holding mechanism, a displacement detector for detecting the displacement amount stored in the position holding mechanism, said position holding mechanism has a plurality of uneven portions in the moving direction In series
A first member and a claw-shaped portion that can engage with these concave and convex portions.
The second member, and the first member and the second part
Assemble the materials with an appropriate elastic pressing force so that they contact each other.
And the first member or the above
One of the second members is a movable member, and when the measurement target is displaced in one direction, the first portion
When the uneven portion of the material and the claw-shaped portion of the second member slide together
In addition, in the opposite displacement, the claw-shaped part becomes the uneven part.
The moving position of the movable member is maintained by meshing
The maximum displacement amount detection device is characterized by storing the displacement amount of the measurement object . 2. The displacement transmitting mechanism connects a part of an object to be measured or a member fixed to the object to be measured and an end of a movable member of the object to be measured with a flexible string-shaped body. The maximum displacement amount detection device according to claim 1, wherein the maximum displacement amount detection device is configured by: 3. The displacement transmitting mechanism is configured by disposing a part of an object to be measured or a member fixed to the object to be measured and an end of a movable member of the object to be contacted or brought close to each other. The maximum displacement amount detecting device according to claim 1, wherein 4. The displacement detecting means detects a change in displacement amount.
Change in resistance, or change in capacitance, or inductor
To any of these changes or a combination of them
3. The converter according to claim 1, wherein
The maximum displacement amount detection device according to any one of 1 to 3 above. 5. The displacement detecting means comprises a main scale and a vernier scale.
A graduation indicating mechanism that is formed, the displacement of the measuring object
The method according to claim 1, wherein the quantity is indicated on a scale.
The maximum displacement amount detection device according to any one of claim 3 .