JP3513297B2 - Fall safety switch - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fall safety switch for electric stoves, electric warmers and the like.

[0002]

2. Description of the Related Art As a conventional technique, a push button protruding outward from the lower surface of the body and a switch directly interlocking with the push button are provided. For example, there is a structure in which the switch is turned on by being pushed by the surface and the push button is returned by the spring when it falls, and the switch is turned off by projecting from the lower surface of the body. (See, for example, Japanese Utility Model Laid-Open No. 57-176035).

[0003]

In the structure of the prior art, which has a push button projecting from the lower surface of the body to the outside, in the event of a large earthquake, the push button of the fallen body cannot be replaced by another weight. There was a problem that things could be suppressed and the switch turned on, causing a fire.

[0004]

The present invention has the following constitution in order to solve the above problems.

That is, a concave space is opened in the upper part of the upper case, a switch having an opening / closing contact is provided in the upper part of the space, and the movable piece and the ball are housed in the space so as to press the switch. A shaft for mounting the shaft is provided so as to be retractable in the space, a push button is provided so as to interlock with the outer circumference of the shaft, and a detection unit for detecting the opening and closing of the switch and a detection unit for detecting the position of the push button are provided. A display device including a connected display unit is provided.

Further, a detection unit for detecting opening / closing of the switch and a detection unit for detecting the position of the push button are provided, and a detection unit for detecting opening / closing of the switch when the fall safety switch is in a fall state. A display device including a display unit for displaying when the detection unit for detecting the position of the push button and the ON state are simultaneously turned on is provided.

Further, a detection unit for detecting the opening / closing of the switch and a detection unit for detecting the position of the push button are provided, and a detection unit for detecting the opening / closing of the switch when the fall safety switch is in the fall state. A display device including a display unit that does not display when either one of the detection unit that detects the position of the push button and the OFF state is provided.

[0008]

[Operation] With the above configuration, in case of a large earthquake,
Even if other heavy objects hold down the push button such as a fallen electric stove, the fall safety switch will not be turned on if the body is tilted or falls, so at least in the above situation it may cause a fire. It is possible to check the fall state by the display, and the fall state will not be continued while the power is on.

Further, after the fall safety switch is turned off once, when the normal use is attempted, if the electric stove is shocked, the fall safety switch may not be turned on. I can confirm.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a sectional view of a tipping safety switch showing an embodiment of the present invention.

Reference numeral 1 denotes an upper case composed of a concave surface 1a having a through hole in the most concave portion and a cylindrical wall 1b, and the through hole extends downward in a cylindrical shape.

Reference numeral 2 denotes a shaft which penetrates through the through hole and is movable in the longitudinal direction. The shaft 2 is provided with a concave portion on which a ball 3 can be placed.

The shaft 2 is pushed downward by a coil spring 4, and the lower end of the coil spring 4 is fixed by a washer 5 and a push nut 6 fixed to the shaft 2. The shaft 2 has a structure that prevents the shaft 2 from coming out downward from the upper case 1 due to the upper step 2a.

A movable piece 7 is provided above the sphere 3 and is movable in the vertical direction along the cylindrical wall 1b. The convex portion 7a has a cylindrical shape in order to be movable in the vertical direction without changing the posture. Wall 1
It has a structure that moves along the groove provided in b.

Also, the movable piece 7, the concave surface 1a, and the cylindrical wall 1
The space 14 is partitioned by b so that the ball 3 does not go outside.

Two ribs 1c are provided on the concave surface 1a.

Above the movable piece 7, there is a switch 8 consisting of a leaf spring 8a, a contact 8b and a substrate, which is fixed to the upper case 1 by a set screw 9. The movable piece 7 is pushed downward by the leaf spring 8a.

The push button 1 is formed so as to cover the shaft 2.
0, and inside the push button 10, there is a coil spring 11 for transmitting the load from the lower portion of the push button 10 to the lower portion of the shaft 2. The coil spring 11 serves as an impact to prevent the load from the lower portion of the push button 10 from being directly applied to the switch 8.

There is a lower case 12 for preventing the push button 10 from coming out downward, and it is fixed to the upper case 1 with a set screw.

The switch 8 has an O of a leaf spring 8a and a contact 8b.
A detection unit 23a that is turned on during FF is provided.

A display unit 22 is connected to the display device 21 and further connected to the display unit 22 to detect the opening / closing of the switch 8 so as to display the ON / OFF state.
And a detection unit 23b for detecting the position of the push button 10, and the display unit 22 may be a visual display such as a lamp or an aural display such as a buzzer. Detector 23a
Reference numeral 23b is interlocked with the operation of the shaft 2 and the push button 10, detects that the push button 10 has been pushed upward, and turns on.

In FIG. 6, reference numeral 15 is an electric stove main body, and 16 is a fall safety switch having the above-mentioned structure according to the present invention.

The push button 10 part projects downward from the leg portion of the electric stove body 15, and if the electric stove body 15 is installed upright on the floor, the push button 10 part is pushed and falls. In this case, the push button 10 part is returned to the original position by the spring, and is projected from the leg part of the electric stove body 15.

A display portion 22 is provided on the surface of the electric stove body 15.

Next, the operation of the above configuration will be described.

2, FIG. 3, FIG. 4, and FIG. 5, in FIG. 2, the upper case 1 and the lower case 12 of the main body are upright and the push button 1 is shown.
It is a figure which shows the state where a load is not added to 0.

The shaft 2 is pushed downward by the coil spring 4, and the sphere 3 is in a state of resting in the concave portion above the shaft 2 by gravity as long as the main body takes the posture shown in FIG.

Further, the movable piece 7 is located below, and the switch 8 is in the OFF state in the opened state. At this time, the switch 8 is OFF and the detector 23a is ON, but since the push button 10 is located below, the detector 23b is OFF.
The FF state is set, and the display unit 22 of the display device 21 does not display.

FIG. 3 shows a state in which the upper case 1 and the lower case 12 of the main body are upright and the push button 10 is pushed up. For example, when incorporated in an electric stove as shown in FIG. 6, the main body 15 of the electric stove is upright. It is installed on the floor and the floor pushes up the push button 10 to bring it into a normal use state. By pushing up the push button 10, the coil spring 11
Is pushed up, and the coil spring 11 pushes up the washer 5 and the shaft 2.

A ball 3 is placed on the shaft 2, and the ball 3
The upper part of the switch pushes up the movable piece 7 and closes the switch 8 to be in the ON state, and the detection unit 23a is in the OFF state.

Since the push button 10 is pushed upward and the detecting portion 23b is in the ON state, the display portion 22 of the display device 21 does not display.

FIG. 4 shows a state in which the upper case 1 and the lower case 12 of the main body are tilted or tumbled to be substantially horizontal, but here they are shown vertically for the sake of explanation.

In the fall safety switch incorporated in the electric stove, the fall push button 10 is separated from the floor surface, and the shaft 2 is pushed downward by the coil spring 4.

However, since the main body is almost horizontal, the sphere 3 leaves the upper portion of the shaft 2 due to gravity and rolls on the cylindrical wall surface 1b of the upper case 1.

The movable piece 7 is located below and the switch 8 is turned off in the open state.

Although the detector 23a is turned on, the detector 23a
Since b is turned off, the display 22 of the display device 21 is not displayed.

FIG. 5 shows a state in which the push button 10 is pushed up in a state in which the main body falls down and becomes substantially horizontal.

The tipping safety switch incorporated in the electric stove shows a state in which the tipping push button 10 is separated from the floor surface, but some heavy object or the like moves to forcefully push the push button 10.

By pushing up the push button 10, the coil spring 11 is pushed up, and the coil spring 11 pushes up the washer 5 and the shaft 2, but the sphere 3 rolls on the cylindrical wall surface 1b of the upper case 1 due to gravity, so that it moves to the movable piece 7. The load is not transmitted, the movable piece 7 is located below, and the switch 8 is turned off while the switch 8 remains open.

At this time, the switch 8 is turned off,
The detection unit 23a is turned on.

Since the detection unit 23b of the display unit 21 detects that the push button 10 is pushed up, it is turned on and the display unit 22 of the display device 21 is displayed.

[0043]

As described above, according to the present invention, a concave space is formed in the upper part of the upper case, a switch having an opening / closing contact is provided so as to close the space, and the space is formed so as to press the switch. The movable piece inside and the sphere are stored, and the shaft for mounting the sphere is provided in the space so that it can be retracted and retracted, and the push button is provided in the lower case so as to interlock with the outer circumference of the shaft, and the lower case is the lower part of the upper case. It is configured to be connected to
Further, when the upper case tilts or falls, a sphere is formed on one side surface of the concave space formed by the tilted concave surface and the bottom surface of the movable piece located on the cylindrical wall formed above the concave surface. Since the movable piece does not turn on the switch when the tip of the shaft is maximally protruded into the space, the electric stove equipped with the tipping safety switch falls over and other heavy objects are Even if the push button of the fall safety switch is held down, if the body falls down, the ball rolls out from the top of the shaft and the load of the push button is not transmitted to the switch, so the switch remains off. It does not cause a fire.

Furthermore, it is possible to warn the user of a dangerous state in which the electric stove is turned on and is pushed by another heavy object by displaying the electric stove.

Further, even when the electric stove main body is unexpectedly shocked in normal use, it can be confirmed by the display.

[Brief description of drawings]

FIG. 1 is a front sectional view of a tipping safety switch according to an embodiment of the present invention.

FIG. 2 is a front sectional view of a tipping safety switch according to an embodiment of the present invention.

FIG. 3 is a front cross-sectional view showing the tipping safety switch according to an embodiment of the present invention in normal use.

FIG. 4 is a front sectional view showing a fall safety switch according to an embodiment of the present invention when it falls.

FIG. 5 is a cross-sectional view showing a state where the push button of the tipping safety switch according to the embodiment of the present invention is pushed. (When falling)

FIG. 6 is a schematic cross-sectional view showing a fall safety switch according to an embodiment of the present invention incorporated in an electric stove.

[Explanation of symbols]

1 upper case 2 shafts Three balls 7 movable pieces 8 switches 8b open / close contact 10 push buttons 21 Display 22 Display 23a Detector 23b Detector

Claims (3)

(57) [Claims] 1. A concave space (1) on the upper part of the upper case (1).
4) is opened, and a switching contact (8
A switch (8) having b) is provided, the movable piece (7) and the ball (3) are housed in the space (14) so as to press the switch (8), and the ball (3) is placed. The shaft (2) is provided in the space (14) so as to be retractable and retractable, and the push button (10) is interlocked with the outer circumference of the shaft (2).
And a display unit (22) connected to a detection unit (23a) that detects opening and closing of the switch (8) and a detection unit (23b) that detects the position of the push button (10). 21) Fall safety switch characterized by being provided. 2. A fall safety switch provided with a detection unit (23a) for detecting the opening and closing of the switch (8) and a detection unit (23b) for detecting the position of the push button (10) is in a fall state. From the display unit (22) displayed when the detection unit (23a) that detects the opening and closing of the switch (8) and the detection unit (23b) that detects the position of the push button (10) are simultaneously turned on. Display device (2
The fall safety switch according to claim 1, wherein 1) is provided. 3. A fall safety switch provided with a detection unit (23a) for detecting opening / closing of the switch (8) and a detection unit (23b) for detecting the position of the push button (10) when the fall safety switch is in a fall state. One of the detection unit (23a) that detects the opening and closing of the switch (8) and the detection unit (23b) that detects the position of the push button (10) is OF.
The tipping safety switch according to claim 1, further comprising a display device (21) including a display unit (22) that does not display when in the F state.