JP2599451Y2 - Contact pressure measuring device for conductive contact members - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact pressure measuring device for measuring a contact pressure of a conductive contact member having one end fixed and the other end in contact with a surface of a predetermined conductive member.

[0002]

2. Description of the Related Art Conventionally, an apparatus of this type has a cylindrical main body provided with a scale indicating pressure on a side surface thereof, and is slidably supported in the main body and provided with a spring inside the main body. When the shaft urged in the direction protruding from the end and the shaft provided on the shaft and moved on the scale in accordance with the movement of the shaft in the main body, and the tip of the shaft is pressed against the main body side And a indicating member for indicating the pressure value on a scale.

When such a spring type pressure measuring device is used, first, the tip of the shaft portion of the measuring device is attached to the end of the conductive contact member on the side in contact with the conductive member. The contact between the conductive contact member and the conductive member is pressed in a direction in which the contact is opened, and the value of the scale indicated by the indicating member of the measuring instrument is read at the moment when the contact is opened. The contact pressure on the conductive member was measured.

[0004]

However, in the above-mentioned conventional device, however, the user has determined that the contact between the conductive contact member and the conductive member has been opened and the value of the scale indicated by the indicating member at that time. , It is difficult to measure the contact pressure accurately unless you look at it at the same time.
The measured values were not reproducible, and the measured values varied depending on the person performing the measurement.

[0005] The present invention has been made in view of such a problem, and is simple, without individual differences and with good reproducibility.
It is an object of the present invention to provide a contact pressure measuring device for a conductive contact member capable of measuring a contact pressure of the conductive contact member.

[0006]

That is, the present invention has been made to achieve the above-mentioned object, and the present invention is directed to the conductive member of the conductive contact member having one end fixed and the other end in contact with the surface of a predetermined conductive member. A contact pressure measuring device for measuring the contact pressure to the main body, the main body formed in a cylindrical shape, slidably supported in the main body, and a spring provided inside the main body, the main body of the main body A shaft urged in a direction to protrude from the end,
A scale provided on a side surface of the main body and representing a pressure when a tip portion of the shaft is pressed against the main body; and a scale provided on the shaft and moving on the scale in accordance with movement of the shaft in the main body. A spring-type pressure measuring device comprising an indicating member for moving and indicating the value of the pressure, a clip detachable at a predetermined position electrically connected to the conductive member, and a resistance value between the clip and the shaft portion However, the conductive contact member and the conductive member
Resistance between the two members when the contact is open
Smaller than the conductive contact member and the conductive member
From the resistance value between the two members when
Determining the hand to determine whether or not also increases the set or predetermined value
Stage and the determination means determines that the value is equal to or greater than the predetermined value.
And a notifying means for notifying the fact. The gist of the present invention is a contact pressure measuring device for a conductive contact member.

[0007]

The contact pressure measuring device for a conductive contact member according to the present invention thus constructed is used as follows. First,
The clip is attached to a predetermined location that is in conduction with the conductive member with which the conductive contact member contacts. The tip of the shaft of the spring-type pressure measuring device is attached to the end of the conductive contact member that is not fixed, that is, the end that is in contact with the surface of the conductive member. Is pressed in a direction in which the contact between the conductive member and the conductive member is opened.

[0008] Then, pressure is applied to the conductive contact member in a direction away from the conductive member, and the shaft of the spring-type pressure measuring device is pressurized in a direction to contract toward the main body side of the spring-type pressure measuring device. Will be added. And in the spring type pressure measuring device, the indicating member provided on the shaft portion is:
The shaft moves on a scale provided on a side surface of the main body in accordance with the movement of the shaft in the main body, and a pressure value at that time is indicated on the scale.

[0009] Here, the conductive contact member is Ru away from the surface of the conductive member, the determination means, clip and spring pressure
The resistance between the force measuring instrument shaft and the conductive contact
The two members when the contact with the conductive member is released
The conductive contact member and the conductive portion are smaller than the resistance value between them.
Resistance between the two members when they are in contact with the material
(Approximately 0Ω) is greater than or equal to a predetermined value set.
And the notifying means notifies the effect. And
When the notification is performed by the notification means as described above, by reading the pressure value indicated by the indicating member on the scale of the spring-type pressure measuring device, the contact pressure of the conductive contact member with respect to the conductive member can be measured. You can.

[0010] That is, in the contact pressure measuring device of the present invention the conductive contact member, clips, judging means judges the contact state between the conductive contact member and the conductive member by 及 beauty information means, according to the notification means When the notification is performed, the contact pressure of the conductive contact member is measured by a spring-type pressure measuring device.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. First, FIG. 1 is an external view showing an external appearance of a contact pressure measuring device to which the present invention is applied, and FIG. 2 is a configuration diagram showing an internal configuration thereof.

As shown in FIG. 1, a contact pressure measuring device 2 of the present embodiment comprises a cylindrical spring type pressure measuring device 4, a clip 6 which can be detachably attached to a predetermined position, and a clip 6 and a spring type pressure measuring device. detecting a resistance value between the 4 informed of the detection result
It includes a circular cylinder-shaped resistance detection unit 8, a. Then, the spring type pressure measuring device 4 and the resistance detecting unit 8 are inserted through metal fixed bands 10a and 10b near both ends thereof, and the spring type pressure measuring device 4 and the resistance detecting unit 8 in the fixed bands 10a and 10b. Are fixed in parallel by tightening the portions between them with screws 12a and 12b, respectively. Also, from the end of the resistance detection unit 8 on the side fixed by the fixing band 10a,
Two electric wires W1 and W2 extend, and one end of one electric wire W1 has a screw 12a for fastening the fixing band 10a.
The other end of the electric wire W2 is connected to the clip 6 described above.

As shown in FIGS. 1 and 2, the spring-type pressure measuring device 4 has a main body 14 formed in a cylindrical shape, a hook-shaped rod at one end, and a linear end portion. The body 14
The main body 14 is slidably supported in the main body 14 with the hook-shaped end protruding from the side fixed to the fixing band 10b of the main body 14 from the side fixed with the fixing band 10a. A shaft portion 16 and the shaft portion 1 provided inside the main body 14.
6 to the fixing band 10a of the main body 14.
A spring 18 for urging in a direction to protrude from the end fixed on the side, and a linear end 16a of a shaft 16 provided on a side surface of the main body 14 pressed against the main body 14; A scale 20 indicating the pressure when the hook-shaped end portion 16b of the portion 16 is pulled to the side opposite to the main body 14, and a scale 20 provided on the shaft portion 16 in accordance with the movement of the shaft portion 16 in the main body 14; When the linear end 16a of the shaft 16 is pressed against the body 14, or when the hook-shaped end 16b of the shaft 16 is pulled to the opposite side of the body 14, This is a well-known spring-type pressure measuring device including a pointing member 22 for pointing.

As shown in FIG. 2, the main body 14 and the shaft 1
6 is always electrically connected to the shaft portion 16 via the screw 12a, the fixed band 10a, the main body 14, and the spring 18 because the wire 18 is always electrically connected to the shaft portion 16. On the other hand, as shown in FIG. 1, the resistance detecting unit 8 includes a main body 24 formed in a cylindrical shape, and a light emitting diode LED (hereinafter simply referred to as an LED) provided on a side surface of the main body 24.
A buzzer BZ provided at the end of the main body 24 on the side fixed by the fixing band 10b, and a resistance value between the clip 6 and the spring-type pressure measuring device 4 provided inside the main body 24 and detected. When the resistance value is smaller than a predetermined value, a detection circuit 26 that lights the LED and sounds the buzzer BZ
And

Here, as shown in FIG. 2, the detection circuit 26 includes a battery B as a power source for the circuit, the LED, and the buzzer BZ, and a resistor for dividing the voltage V of the battery B to generate a reference voltage Vth. Resistors R1 and R2, and a resistor R3 which is set to the same value as the resistor R2 and generates a detection voltage Vin corresponding to the resistance value VR between the clip 6 and the spring-type pressure measuring device 4,
An open collector output type comparator 28 for comparing the reference voltage Vth with the detection voltage Vin, a resistor R4 for generating a high level at an output terminal of the comparator 28, and an LED and a buzzer based on the output of the comparator 28. N driving BZ
The battery B includes a PN transistor Tr, a resistor R5 for limiting a base current of the transistor Tr, a resistor R6 for biasing the transistor Tr, and a resistor R7 for limiting a current flowing to the LED. The electric wire W2 connected to the clip 6 is directly connected to the plus side of.

In the detection circuit 26 configured as described above, the voltage V of the battery B is divided by the resistance value VR generated between the clip 6 and the spring type pressure measuring device 4 and the resistor R3. , A detection voltage Vin corresponding to the resistance value VR is generated, and the comparator 28 compares the detection voltage Vin with the reference voltage Vth to determine whether the resistance value VR is equal to or greater than the value of the resistor R1. To detect.

That is, when the resistance value VR is smaller than the value of the resistor R1, since the value of the resistor R2 and the value of the resistor R3 are the same, the detection voltage Vin becomes larger than the reference voltage Vth and the comparison is made. The output unit 28 outputs a High level signal.
Then, a base current is supplied to the transistor Tr via the resistors R4 and R5, and the transistor Tr is turned on to
The ED lights up and the buzzer BZ sounds. Conversely, when the resistance value VR is equal to or greater than the value of the resistor R1, the detection voltage Vin becomes equal to or less than the reference voltage Vth, and
Outputs a low level, and the transistor Tr is turned off.
Then, the LED goes off and the buzzer BZ stops sounding.

Next, with respect to the method of using the contact pressure measuring device 2 configured as described above, the device is used for inspection of a well-known master controller used for starting and stopping an engine in a diesel car, controlling a shift, and the like. The case will be described as an example. First, a master controller of this type is mounted in front of a cab of a railcar and is operated by a driver of the railcar. Then, as shown in FIG. 3, when a driver rotates a steering wheel (not shown), the shaft 30 rotates, and the main cylinder 32 rotates accordingly.
The shaft 30 also rotates via the gear 34 when another handle is operated, and the main cylinder 32 rotates accordingly. On the other hand, a copper plate 36 as a conductive member having a predetermined pattern is provided on the surface of the main cylinder 32, and a plurality of copper plates 36 (3 in FIG. ), The contact fingers 38a, 38b, 38c as conductive contact members
It is screwed by Oa, 40b, 40c. These contact fingers 38a, 38b, 38c are connected to various control circuits (not shown) for engine control and gear shift control by wires 42a to 42e.

That is, in this type of master controller, when the driver operates the steering wheel, the main cylinder 32 rotates and the contact fingers 38a, 38
The connection pattern between b and 38c is changed so that the control of the engine and the control of the shift are performed.

Therefore, such contact fingers 38a, 38
When the contact pressure of the b, 38c against the copper plate 36 decreases,
Since it becomes impossible to control the engine and the shift, each contact finger 38a, 3
The contact pressure of the copper plates 8b and 38c is measured to check for abnormalities.

In this type of master controller, usually two or more contact fingers are in contact with the copper plate 36. Therefore, even if one contact finger is forcibly separated from the copper plate 36, any one of the contact fingers may be contacted. The finger is in contact with the copper plate 36 and each contact finger 3
8a, 38b, 38c are not completely insulated from each other,
Since the coil and the like provided in the various control circuits described above have a resistance value of about 400Ω between each other, even if the contact finger is separated from the copper plate 36 to measure the contact pressure, the contact finger and the copper plate 36 It is in an electrically connected state.

Therefore, in the contact pressure measuring device 2 of the present embodiment, when the contact pressure of the contact finger is measured by setting the resistor R1 in the detection circuit 26 to 150Ω, the contact between the contact finger and the copper plate 36 is measured. When the resistance value between them becomes 150Ω or more, it is determined that the contact finger has separated from the copper plate 36.

Hereinafter, a case will be described in which the contact pressure of the contact finger 38b in contact with the copper plate 36 is measured using the contact pressure measuring device 2 of the present embodiment. As shown in FIG. 3, first, the clip 6 is connected to the copper
Is attached to the screwing portion of the contact finger (for example, the contact finger 38a) that is in contact with. An end 16a of the shaft 16 of the spring-type pressure measuring device 4 is attached to the end of the contact finger 38b on the side where the screw is not screwed, that is, the end that is in contact with the copper plate 36.
Is pressed in a direction in which the contact between the contact finger 38b and the copper plate 36 is opened.

Then, pressure is applied to the contact finger 38 b in a direction away from the copper plate 36, and the shaft 16 of the spring type pressure measuring device 4 is attached to the main body 1 of the spring type pressure measuring device 4.
Pressure is applied in the direction of contraction toward the fourth side. In the spring type pressure measuring device 4, the indicating member 22 provided on the shaft 16 moves on the scale 20 in accordance with the movement of the shaft 16 in the main body 14, and the pressure value at that time is displayed on the scale. 2
Indicate on 0.

Here, when the contact finger 38b is in contact with the copper plate 36, the resistance between the clip 6 and the end 16a of the shaft 16 is substantially 0Ω, and the set value of the resistor R1 (150Ω). As described above, as described above, the LED of the resistance detection unit 8 is turned on, and the buzzer BZ sounds. Then, when the contact finger 38b separates from the copper plate 36, as described above, the resistance value between the contact finger 38a and the contact finger 38b, that is, the resistance value between the clip 6 and the end 16a of the shaft portion 16, Since the resistance increases from 0Ω to about 400Ω and becomes 150Ω or more, the LED of the resistance detection unit 8 is turned off and the buzzer BZ stops blowing.

Then, when the LED is turned off and the buzzer BZ stops blowing, if the pressure value indicated by the indicating member 22 is read on the scale 20 of the spring type pressure measuring device 4, the contact finger 38b is It is possible to measure the contact pressure at the moment when it is separated from the copper plate 36.

As described above, in the contact pressure measuring device 2 of the present embodiment, when the contact finger separates from the copper plate 36, the LE
Since D goes out and the buzzer BZ stops sounding, if the scale 20 of the spring-type pressure measuring device 4 is read at that timing, the contact pressure of the contact finger can be accurately measured.
That is, when the user has separated the contact finger from the copper plate 36,
At this time, the contact pressure can be accurately and easily measured even if the value of the scale 20 indicated by the indicating member 22 is not simultaneously viewed, and it is visually determined that the contact finger has separated from the copper plate 36. Since there is no need to do so, almost the same measurement result can be obtained regardless of who measures.

Further, according to the contact pressure measuring device 2 of the present embodiment, as described above, even if the contact finger as the conductive contact member and the copper plate 36 as the conductive member are separated from each other, both of them have a predetermined resistance. Even when the members are electrically connected by a value, by appropriately setting the resistance value to be determined, it is possible to accurately detect that both members have separated from each other and measure the contact pressure.

Further, in the contact pressure measuring device 2 of this embodiment, the spring type pressure measuring device 4 and the resistance detecting section 8 are fixed in parallel to each other by fixing bands 10a and 10b, so that the entire device is compact. The operation is very simple. In this embodiment, the detection circuit 26 determines
LED and buzzer BZ correspond to the notification means.
ing. On the other hand, in the embodiment above mentioned, the detection circuit 26 in the resistance detection unit 8, was constructed in resistors and transistors, etc.,
A resistance value VR generated between the clip 6 and the spring-type pressure measuring device 4 (the shaft portion 16) is detected, and LE is determined according to the detection result.
If a commercially available IC that can directly drive D and the buzzer BZ is used, the size of the detection circuit 26 can be reduced, and the entire contact pressure measurement device can be further reduced in size.

Then, next, as an example of such an IC, "LM3909 manufactured by National Semiconductor"
A contact pressure measuring device in which a detection circuit is configured by using FIG. 1 will be briefly described with reference to FIG. As shown in FIG.
In the contact pressure measuring device 44 of the present embodiment, the detection circuit 46
Except that it is constituted only by battery B and IC,
The configuration is exactly the same as the contact pressure measuring device 2 described above.

This IC has 8
Of which two terminals are open-collector output terminals, the fourth terminal is a power minus terminal,
Terminal No. is a current detection terminal, terminals No. 1 and No. 8 are setting terminals for changing the setting of the detection current, and terminals No. 3 and No. 7 are unconnected terminals. Then, when the current flowing from the fifth terminal is large, the output of the second terminal becomes low level, and when the current flowing from the fifth terminal becomes small, the output of the second terminal becomes high level.

In such a detection circuit 46, the resistance value VR between the clip 6 and the spring type pressure measuring device 4 is 15
When it is smaller than 0Ω, the current flowing into the fifth terminal of the IC becomes large, so that the second terminal becomes low level and L
The ED and the buzzer BZ are driven, and conversely, the resistance value VR is 1
When the resistance is 50Ω or more, the current flowing into the fifth terminal becomes small, so that the second terminal becomes high level, and the driving of the LED and the buzzer BZ is stopped.

With the contact pressure measuring device 44 configured as described above, the same effect as that of the above-described contact pressure measuring device 2 can be obtained. In the above-described embodiment, the case where the contact pressure measuring devices 2 and 44 are used to measure the contact pressure of the contact finger in the master controller has been described in detail. 44 can be used to measure the contact pressure of any conductive contact member that contacts the conductive member, such as a motor brush.

[0034]

As described above, in the contact pressure measuring device for a conductive contact member according to the present invention, the notifying means allows the resistance value between the shaft of the spring type pressure measuring device and the clip, that is, the conductive value. When the notification that the resistance value between the contact member and the conductive member has become equal to or greater than a predetermined value has been made, the conductive contact is obtained by reading the scale indicated by the indicating member of the spring-type pressure gauge. The contact pressure of the member can be measured.

Therefore, according to the contact pressure measuring device for the conductive contact member of the present invention, the user can confirm that the contact between the conductive contact member and the conductive member has been opened and that the scale indicated by the indicating member at that time. The contact pressure of the conductive contact member with respect to the conductive member can be accurately measured even if the values are not simultaneously observed.

In addition, since the scale may be read when the notification is made by the notification means, it is possible to obtain almost the same measurement result no matter who performs the measurement.
In particular , in the contact pressure measuring device for a conductive contact member of the present invention, the clip and the spring pressure
The resistance between the shaft of the measuring instrument and the conductive contact
Between the two members when the contact with the conductive member is released
Conductive member and conductive member having a resistance value smaller than
Resistance between the two members when the
It is determined whether or not it is equal to or greater than a predetermined value set larger than
Between the clip and the shaft by the determination means.
If the resistance value is determined to be equal to or greater than the predetermined value,
Means is to inform that effect. Therefore, even when the contact between the conductive contact member and the conductive member is opened, even when both are electrically connected with a predetermined resistance value,
The contact pressure of the conductive contact member can be accurately measured at a timing when both are separated.

[Brief description of the drawings]

FIG. 1 is an external view illustrating an external appearance of a contact pressure measuring device according to an embodiment.

FIG. 2 is a configuration diagram illustrating an internal configuration of a contact pressure measurement device according to an embodiment.

FIG. 3 is an explanatory diagram illustrating a method of using the contact pressure measuring device according to the embodiment.

FIG. 4 is a configuration diagram illustrating an internal configuration of a contact pressure measurement device according to another embodiment.

[Explanation of symbols]

2, 44 contact pressure measuring device 4 spring pressure measuring device 6 clip 8 resistance detecting section 14 body
16: Shaft 18: Spring 20: Scale
22 indicating member 26, 46 detecting circuit 36 copper plate 38a, 38b, 38c contact finger LED light emitting diode BZ buzzer

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Showa 55-6889 (JP, U) Japanese Utility Model Showa 37-2090 (JP, Y1) Japanese Utility Model Showa 42-13271 (JP, Y1) (58) Field (Int.Cl. ⁶ , DB name) G01L 5/00 H01R 43/00

Claims (1)

(57) [Scope of request for utility model registration] 1. A contact pressure measuring device for measuring a contact pressure of a conductive contact member, one end of which is fixed and the other end of which contacts a surface of a predetermined conductive member, to the conductive member, A main body formed in the main body, a shaft portion slidably supported in the main body and urged in a direction protruding from an end of the main body by a spring provided inside the main body, and a side surface of the main body. A scale indicating the pressure when the tip of the shaft is pressed against the main body, and the pressure provided on the shaft and moving on the scale in accordance with the movement of the shaft in the main body. A spring-type pressure measuring device comprising: an indicating member for indicating the value of; a clip detachably attached to a predetermined location electrically connected to the conductive member ; Contact
When the contact between the contact member and the conductive member is open,
And the conductivity is smaller than the resistance value between the two members.
When the contact member is in contact with the conductive member
A judging means for judging whether large set more than a predetermined value than the resistance value between the two members, when it is determined that the predetermined value or more by the determination unit, and informing means for informing to that effect, the A contact pressure measuring device for a conductive contact member, comprising: