JPS61109234A - Operation checker for liquid level alarm - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a liquid level warning device that warns when the amount of liquid in a reservoir is less than a required amount, and more specifically, the present invention relates to a liquid level warning device that warns when the amount of liquid in a reservoir is below a required amount. The present invention relates to an operation confirmation device for a liquid level alarm device for confirming whether or not the liquid level alarm device is activated.

"Prior Art" Generally, a liquid level alarm device includes a float that moves up and down following the liquid level in a reservoir, a magnet provided on this float,
and a reed switch that is activated by the magnet when the float reaches a predetermined lowering position. It is designed to activate and issue an alarm.

Various configurations have already been proposed as operation confirmation devices to check whether this type of liquid level alarm device is normal or not. Usually, the above-mentioned float is forced by operation from outside the reservoir. Activate the reed switch by lowering the float to the predetermined lowering position, or conversely, bring the reed switch close to the magnet provided on the float to activate the reed switch, and check whether the liquid level alarm device is normal or not. I was trying to inspect it.

"Problems to be Solved by the Invention" Conventionally, a diaphragm is provided at the opening of the reservoir to seal the opening, and the diaphragm is
A device is known that can be displaced to follow changes in the volume of the upper space within the reservoir due to the rise and fall of the liquid level within the reservoir.

Even in the reservoir whose opening is sealed with a diaphragm, it is necessary to install a device to confirm the operation of the liquid level warning device.
Providing a push-down member that penetrates the diaphragm from outside the reservoir and forcibly lowers the float may impair airtightness.On the other hand, if the reed switch is placed close to the magnet provided on the float, This is undesirable because there is a risk of damage to the reed switch or breakage of the lead wire.

"Means and Effects for Solving the Problems" In view of such circumstances, the present invention provides the diaphragm with a telescoping drive capable of contacting the float and pushing the float down to the predetermined lowering position. The airtightness of the diaphragm can be maintained completely by providing a push-down means for lowering the float to a predetermined lowering position by pushing down the driving part from the outside of the diaphragm. .

``Embodiment'' The present invention will be described below with reference to an illustrated embodiment. In FIG. 1, reference numeral 1 denotes a reservoir of a master cylinder. A required amount of brake fluid is stored in the reservoir 1, and the upper end of the reservoir 1 is opened. The portion 2 is sealed by a diaphragm 4 whose outer periphery is sandwiched between the reservoir 1 and a cap 3 screwed onto the reservoir 1.

As shown in FIG. 2, a guide portion 5 having a U-shaped horizontal cross section is integrally provided at the bottom of the reservoir 1, and the brake fluid stored in the reservoir 1 is contained in the guide portion 5. A float 6 is provided which moves up and down following the surface. The guide portion 5 having a U-shaped cross section has guide ribs 7 formed in the axial direction of the reservoir 1 on the mutually opposing wall surfaces and the intermediate wall surface, and the retaining groove 8 formed in the float 6 is connected to each guide rib 7. It is slidably engaged with. Further, a pin 9 is provided upright on the guide rib 7 provided on the intermediate wall surface, and the flow is connected to the pin 9.

A stopper 11 is attached to the upper surface of the concave portion 10 formed in the hollow to restrict the rising end position of the float 6 (see FIG. 3).

As shown in FIG. 1, a magnet 1 is attached to the bottom of the float 6.
2 is buried in the reservoir 1, and a reed switch 13 is provided in the reservoir 1, which is activated by the magnet 12 when the float 6 reaches a predetermined lowered position. This reed switch 13 has a normally open contact (not shown), and when the float 6 reaches a predetermined lowered position, the magnetic force closes the contact and activates an alarm such as an indicator light (not shown). It has become.

As shown in FIG. 3, curved parts 20 and 21 which are curved upward in a U-shaped cross section are formed on the outer and inner peripheral parts of the diaphragm 4, respectively, and a float is formed on the shaft part of the inner part of the diaphragm 4. A driving portion 22 is formed that projects downward in a cylindrical shape toward the upper surface of the housing 6 . The curved portion 21 of the inner circumference allows the driving portion 22 to be connected to the float 6.
(see Fig. 1), and the middle part of both curved parts 20 and 21 is connected to the brake fluid level in the reservoir l. When the volume of the upper space in the reservoir 1 changes due to the movement up and down, the movable part 23 can be displaced to follow the change.

Furthermore, the cap 3 is provided with a push-down means 24 that pushes down the drive portion 22 from outside the diaphragm 4 to lower the float I to the lowering end position. This push-down means 24 comprises a pair of levers 26, 27 rotatably supported on the cap 3 by pins 25, an axial push-down member 28 housed within the cylindrical drive portion 22 of the diaphragm 4, and the above-mentioned It is provided with a pair of links 29, 30 that connect a pair of levers 26, 27 and a push-down member thereof, and by rotating the pair of levers 26, 27 in predetermined opposite directions, the link 28. 30, the push-down member 28 is lowered, thereby lowering the driving portion 22 of the diaphragm 4, so that the float 6 can be lowered to the lowering end position.

Furthermore, projections 31 are provided at the tips of the levers 26 and 27, respectively.
．． 32, and the protrusion 31.32 is provided on the cap 3.
forming a latching portion 33,34 that engages each of 32;
As shown in FIG.
．． 34, the push-down member 28 can be held at the raised end position. Further, the levers 2B and 27 have locking portions 35.3B formed at their tips to engage with each other, and as shown in FIG. In this case, the push-down member 2B can be held at the lower end position.

Note that the hooking portions 33, 34 formed on the cap 3 are formed at desired positions on the inner peripheral surface of the annular protrusion 37 formed in a ring shape on the cap 3, and are attached to the push-down member 28 shown in FIG. In a normal state where the dust cover 38 is held at the raised end position, a dust cover 38 is attached to the annular protrusion 37.

According to the above configuration, when checking whether the liquid level alarm device is normal or not, remove the dust cover 38 shown in FIG.
A pair of levers 26, 27, protrusions 31, 32 and latches 33
．． In addition to canceling each agreement with 34, 8-28,
27 in opposite directions to engage the engaging portions 35 and 38 with each other. In this state, as shown in FIG. 1, the push-down member 28 is maintained in a depressed state via the links 28, 30, whereby the float 6 is also moved via the drive portion 22 of the diaphragm 4 to the lowering end position. In this state, it is possible to check whether alarms such as indicator lights (not shown) are operating normally.

Next, FIGS. 4 to 6 show embodiments using other push-down means, and the push-down means 45 in this embodiment
The cap 3 is provided with a push-down member 46 which is movable up and down and fitted into the drive portion 22 of the diaphragm 4. An intermediate portion 47 of this push-down member 46 is formed to have a rectangular cross section, and a stopper portion 48 is provided at the intermediate portion 47.
are integrated.

This stopper portion 48 has a main body portion shaped like an axially long rectangle, and upper and lower portions of the main body portion each having a triangular shape, with only the upper and lower triangular portions forming the intermediate portion 48.
By forming a hole 48 along the outer contour of the stopper part 48 from the main body to the upper and lower parts thereof, both sides 50 of the stopper part 48 can be elastically deformed in a direction toward each other.

On the other hand, as shown in FIG. 6, the cap 3 is formed with a square hole 51 that allows the intermediate portion 47 and the stopper portion 48 to pass through.
The spacing is set to be slightly narrower than the spacing between the both side portions 50 of No. 8. A guide portion 52 having a U-shaped cross section is formed on the lower surface of the cap 3 to guide the other three surfaces of the intermediate portion 47 except for the front surface where the stopper portion 48 is provided, and a guide portion 52 that guides the front surface of the stopper portion 48. A portion 53 is formed.

Note that a dust cover 54 is attached between the cap 3 and the upper part of the push-down member 46. Further, the other configurations are the same as those of the above-described embodiment, and the same or corresponding parts are designated by the same reference numerals.

According to this embodiment, when the push-down member 46 is pushed down,
Both sides 50 of the stopper part 48 pass through the hole 51 of the cap 3 while being elastically deformed, and the both sides 50 pass through the hole 51 of the cap 3.
1, the push-down member 48 will be held at its lower end position even if the push-down force is released. In this state, the push-down member 28 lowers the float 6 to the lowering end position via the driving portion 22 of the diaphragm 4, and therefore, it is possible to check whether alarms such as indicator lights (not shown) are operating normally in this state. You can check whether

On the other hand, it is clear that after the inspection is completed, if the push-down member 48 is pulled up and the stopper part 48 passes upward through the hole 51 while elastically deforming both sides 50, the state shown in the figure will be restored.

FIGS. 7 to 9 show embodiments using still other push-down means. The push-down means 60 of this embodiment is
a push-down button 61 attached to the cap 3 so as to be able to rise and fall;
As shown in FIG. The cylindrical portion 83 has four arm portions 64 extending in the radial direction from the upper end thereof, and a convex portion 85 provided on the lower surface of the tip of each arm portion 64.

Further, as shown in FIG. 9, the cap 3 is provided with a hole 66 that allows the cylindrical portion 63 to pass therethrough, and
Guide portions 67 are integrally provided at four locations around this hole 68 to guide the vertical movement of the cylindrical portion 83 and engage with the arm portion 64 of the cylindrical portion 83 to prevent rotation of the cylindrical portion 63. Further, a convex portion 68 that protrudes radially outward is formed at the lower end of each guide portion 87 .

Then, with the cylindrical portion 63 slidably fitted into the guide portion 87, the convex portion B5 of the arm portion 84 and the guide portion 6
By loading the spring 63 between the convex portion B8 of 7,
Normally, the push-down button 61 and the push-down member 62 are held at the upper end position. The rest of the structure is the same as that of the previous embodiment, and the same or equivalent parts are designated by the same reference numerals.

In this embodiment, if the push-down member button 61 is pushed down against the spring 68, the float 6 can be lowered to the lowering end position via the push-down member 82 and the driving portion 22 of the diaphragm 4. It is clear that it is possible to check whether an alarm device such as a display light (not shown) is operating normally.

``Effects of the Invention'' As described above, according to the present invention, there is no room for damage to the reed switch or breakage of the lead wire, unlike the conventional device in which the reed switch is placed close to the magnet provided on the float. Moreover, since the push-down means pushes down the float from the outside of the diaphragm to a predetermined lowered position, it is possible to maintain the airtightness of the diaphragm completely.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG.
3 is a sectional view taken along the line ■-■ in the figure; FIG. 3 is a sectional view showing a state different from that in FIG. 1; FIG. 4 is a sectional view showing another embodiment of the present invention; 6th side view of the extrusion member 46 of
The figure is a sectional view taken along the line VT-Vl in FIG. 4, FIG. 7 is a sectional view of a main part showing still another embodiment of the present invention, and FIG.
9 is a perspective view of the push button 63 shown in the figure, and FIG. 9 is a sectional view of the cap 3 shown in FIG. 7. 1... Reservoir 2... Opening 3... Cap 4... Diaphragm 6... Float
12... Magnet 13... Reed switch 20
．． 21... Curved part 22... Drive part 23.
...Movable part 24.45.60...Pushing down means 28.46.62...Pushing down member ii Figure 2v! i d I3ffl

Claims (1)

[Claims] A diaphragm that seals the opening of the reservoir, a float that moves up and down following the liquid level in the reservoir, a magnet provided on the float, and a magnet that is activated by the magnet when the float reaches a predetermined lowered position. In the liquid level alarm device, the diaphragm is provided with a retractable driving portion that can come into contact with the float and push the float down to the predetermined lowering position, and the driving portion is connected to the diaphragm. 1. An operation confirmation device for a liquid level warning device, comprising a push-down means for lowering the float to a predetermined lowering position by pushing it down from the outside of the float.