JPS6021330Y2 - Liquid tank with liquid level detection device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a liquid tank equipped with a liquid level detection device for detecting the liquid level in a liquid tank such as a brake mask cylinder of a vehicle.

The liquid level detection device consists of a switch tube that houses a reed switch and a float with a magnet that follows the liquid level.When the liquid level drops to near the specified lower limit level, the reed switch is activated by the magnet in the float, and the reed switch is activated. Activates the alarm in the vehicle driver's seat connected to the vehicle to warn of a decrease in the liquid level.

That is, the liquid level detection device and the alarm constitute a liquid level reduction alarm device.

In such a liquid level detection device, it is necessary to inspect whether it operates normally.

Conventionally, when the cap of the liquid tank is removed, the switch cylinder and the float with magnet are removed from the liquid tank, and the float with magnet is moved to the reed switch position of the switch cylinder, the operation is checked to see if the alarm is activated. However, this operation requires removing the cap, which is very troublesome, and there is a risk that dust, water, etc. may enter the opened liquid tank during the operation.

In order to eliminate such drawbacks, a brake oil decrease warning device shown in FIG.
This is disclosed in Japanese Patent No. 27290.

When the brake oil 42 in the tank body 41 decreases below the specified value, the float 43 descends along the float guide 44, and the permanent magnet 45 provided on the float 43 approaches the reed switch 46 and closes it. Turn it on and the alarm lamp 47 lights up.

When checking the detection operation, turn on the inspection switch 4.8, the power supply 49 will energize the solenoid 50, and the magnetic body 52 embedded in the push rod 51 will turn on the solenoid 50.
0, the push rod 51 descends against the compression coil spring 53. As the push rod 51 descends, the float 43 is pushed down, and the permanent magnet 45 approaches the reed switch 46, turning it on. and alarm lamp 47
lights up.

This allows the cap 54 to confirm that the detection operation is normal.
You can check it by yourself without removing it.

However, in order to install the inspection switch 48 and the solenoid 50, the operation of these components was not checked.
It is not perfect, so double verification is required.

Furthermore, the solenoid 50 is more expensive than a mechanical mechanism, and additional wiring to the solenoid 50 is required, which increases production costs.

The purpose of this invention is to solve the above-mentioned problems, to enable one person to confirm the detection operation without removing the liquid tank cap, and to reduce production costs by eliminating the need for double operation confirmation. It is an object of the present invention to provide a liquid tank with a liquid level detection device that can reduce the amount of liquid.

In order to achieve this objective distantly, the present invention attaches an umbrella-like member on top of the cap of the liquid tank, and includes a push rod passing through the cap, a push button in contact with the upper end of the push rod, and a push rod and a push button. A spring for pushing up is arranged movably up and down between the magnetic float and the umbrella-shaped member, the upper part of the push button projects upward from the umbrella-shaped member, and the push button is pushed down a predetermined distance against the spring. An engaging portion is provided that locks the push button from rising when the push button is pressed down, and the float with a magnet is mechanically pushed down to the reed switch operating position via the push rod when the push button is depressed. The feature is that the position is held mechanically.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

A liquid tank 2 with a liquid level detection device according to the present invention is attached to the mask cylinder body 1, and the liquid tank 2 has a return port 5 and a hydraulic chamber 4 formed in front of the piston 3 in the mask cylinder body 1. It is connected via the compensating port 6.

A switch tube 7 is disposed within the liquid tank 2, and the upper part of the switch tube 7 is attached to a cap 8 to support the switch tube 7.

A reed switch 9 is fixed within the switch tube 7 at a position corresponding to a prescribed lower limit level 10.

The reed switch 9 is connected to the power source 1 via a lead wire 11 to an alarm 12 in the driver's seat of the vehicle and an ignition switch 13.
It is electrically connected to 4.

A float 15 with a magnet is fitted into the switch cylinder 7 so as to be able to move up and down along the switch cylinder 7, and a permanent magnet 16 is attached to a portion of the float 15 with a magnet facing the switch cylinder 7.

A lower limit stopper 17 that determines the lower limit position of the magnetized float 15 is attached to the lower end of the switch tube 7 .

18 is the specified upper limit level of the liquid level 19. An umbrella-shaped member 20 is attached to the top of the cap 8 so as to cover the cap 8.

A push rod 21, a spring 22, and a push button 23 are arranged between the magnetized float 15 and the umbrella-shaped member 20 so as to be movable up and down.

The push rod 21 passes through the cap 8 and the push rod guide 24, and its lower end pushes down the float 15 with a magnet.

The spring 22 is located in a space 25 between the umbrella-shaped member 20 and the upper part of the cap 8, and is inserted between the upper end of the switch tube 7 and the bottom surface of the upper end of the push rod 21.

A knob 26 that protrudes above the umbrella-shaped member 20 is integrally formed on the upper part of the push button 23 .

A plurality of engaging portions 27 are vertically formed on the side of the push button 23 and project outward, and are slidably engaged with a plurality of guide grooves 28 provided in the umbrella-shaped member 20 .

Therefore, while the push button 23 is pressed down while the engaging part 27 is engaged with the guide groove 28, the push button 23 cannot rotate and only descends, but the retaining part 27 passes through the guide groove 28. Then, the push button 23 can be rotated.

At this point, when the push button 23 is rotated, the engagement portion 27 of the push button 23 is engaged with the engagement portion 27 provided on the side of the guide groove 28 of the umbrella-shaped member 20, as shown in FIGS. 3 and 4. Part 29
When the upper surface of the engaging portion 27 and the lower surface of the engaging portion 29 come into contact with each other, the upward movement of the push button 23 is stopped.

In the normal state shown in FIG. 1, the spring 22 pushes up the push rod 21 and brings its upper end into contact with the lower surface of the engaging portion 29, thereby simultaneously pushing up the push button 23 to the position shown in FIG. .

A convex portion 30 is provided at the center of the bottom surface of the push button 23, and a concave portion 31 is provided at the center of the upper end of the push rod 21.

The convex portion 30 fits into the concave portion 31, making it easier for the push button 23 to rotate.

Since the concave portion 31 has a larger diameter than the convex portion 30, the push button 2
3, the push rod 21 does not rotate freely, and no torsional force is applied to the push rod 21 and the spring 22.

The back surface of the recess 31 serves to position the upper end of the spring 22.

Figure 1 shows the normal state, and when the liquid level 19 is high, the magnetic float 15 is submerged in the liquid by the push rod 21, so the liquid level 19 does not follow, but the liquid level 19 decreases. Then, it follows the liquid level 19, and the liquid level 19 reaches the specified lower limit level 1.
When the value decreases to around 0, the magnet 16 of the magnetic float 15 approaches the reed switch 9 and closes it.

As a result, the alarm 12 lights up to warn of a decrease in the liquid level.

To check the liquid level reduction detection operation, the operator pinches the knob 26 of the push button 23, presses down the push button 23, and pushes down the push rod 21 against the spring 22 to move the magnetic float 15. lower it.

The engaging portion 27 of the push button 23 is connected to the guide groove 28 of the umbrella-shaped member 20.
When passing through the engagement part 2, rotate the push button 23 and
7 is engaged with the engaging portion 29, from then on, the knob 26
Even when the finger is removed, the engagement is maintained by the force of the spring 22, and the push button 23 is held in the position shown in FIG.

At this time, the magnetized float 15 descends to the position shown by the two-dot chain line in FIG. 1, and the magnet 16 approaches the reed switch 9 to close it.

When this happens, the alarm 12 lights up. The operator can confirm the detection operation by going to the vehicle driver's seat and seeing that the alarm 12 is lit.

If the alarm 12 is not lit, either the reed switch 9 or the alarm 12 is defective, or there is a break in the electrical wiring.

In the illustrated embodiment, the outwardly protruding retaining portion 27 is provided on the push button 23 and the guide groove 28 is provided on the umbrella-shaped member 20, but by reversing this, the guide groove is provided on the push button 23. , the inwardly protruding engaging portion 27 is attached to the umbrella-shaped member 20,
Each may be provided.

In this case, the engaging portion of the push button 23 is the peripheral edge of the push button 23 located on the side of the guide groove.

As explained above, according to the present invention, an umbrella-shaped member is attached on top of the cap of the liquid tank, and a push rod passing through the cap, a push button in contact with the upper end of the push rod, and a push rod and the push button are connected to each other. A push-up spring is arranged movably up and down between the magnetic float and the umbrella-shaped member, the upper part of the push button projects upward from the umbrella-shaped member, and the push button is pushed down a predetermined distance against the spring. A retaining part is provided to stop the pushbutton from rising, and when the pushbutton is pressed down, the magnetic float is mechanically pushed down to the reed switch operating position via the push rod, and the engaging part Since the position is held mechanically, one person can confirm the detection operation without removing the cap of the liquid tank.

And since no electrical parts are used in the operation confirmation mechanism,
Production costs can be reduced without requiring double operation confirmation.

Furthermore, if a solenoid is used as in the conventional device shown in Fig. 5, there is a risk that the reed switch will malfunction due to its leakage magnetic flux, but according to the present invention, such a risk can be completely eliminated. .

Furthermore, by checking whether the pushbutton is in the normal position or in the depressed position, it is possible to know at a glance whether the operation is being confirmed.

[Brief explanation of the drawing]

Figure 1 is a layer plan view of one embodiment of the present invention, and Figure 2 is Figure 1A.
- A cross-sectional view taken along line A, Figure 3 is a cross-sectional view when checking the detection operation, Figure 4 is a cross-sectional view taken along line B-B in Figure 3, and Figure 5 is a cross-sectional view of a conventional brake oil reduction alarm device. . 2...Liquid tank, 7...Switch cylinder,
... Cap, 9 ... Reed switch, 1
0... Specified lower limit level, 15... Float with magnet, 16... Magnet, 19...
Liquid level, 20...Umbrella-shaped member, 21...Press rod, 22...Spring, 23...
Push button, 26...Knob, 27...
Engagement part, 29...Engagement part.

Claims (1)

[Scope of utility model registration request] In addition to providing a switch tube containing a reed switch,
In a liquid tank equipped with a liquid level detection device that is equipped with a magnetic float that follows the liquid level and operates a reed switch by the magnet of the magnetic float when the liquid level decreases to around the specified lower limit level, the cap of the liquid tank is installed. An umbrella-shaped member is attached above the cap, and a push-down rod that passes through the cap, a push button that contacts the upper end of the push-down lever, and a spring that pushes up the push-down lever and the push button are placed between the float with a magnet and the umbrella-shaped member. The upper part of the push button is arranged to be movable up and down, and the upper part of the push button projects upward from the umbrella-shaped member, and an engaging part is provided that locks the push button from rising when the push button is pushed down a predetermined distance against the spring. A liquid tank with a liquid level detection device characterized by: