JPH07105803A - Turning-over detecting switch - Google Patents

Abstract

PURPOSE:To make the contact of a switching contact point part to be certain. CONSTITUTION:A turning-over detecting switch is provided with a body 1 made of an insulating material and whose lower end is made narrow by boring the bottom into a cone-shape, a switching contact point 2 installed at the lower end of the body 1, a spherical body 3 which opens the circuit of the switching contact point 2 by being parted from the lower end of the body 1, and a cover 4 to be put on the upper end of the body 1. Also, a movable spring 21 is installed wherein the spring closes the circuit of the switching contact point by being pushed by the self weight of the spherical body. Consequently, due to the sagging of the pushed movable spring 21 by the self weight of the spherical body 3, the switching contact point 2 has a prescribed contact pressure and closes the circuit, so that even if the spherical body 3 moves due to oscillation, the movable spring saggs and absorbs the movement and thus the contact point is hardly fluctuated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fall detection switch that automatically opens a switching contact when tilted.

[0002]

2. Description of the Related Art Heretofore, as a fall detection switch of this type, there has been one having a structure shown in FIGS.

This is an insulated body A which is hollowed out in a substantially mortar shape and has a narrower lower end, an opening / closing contact portion B provided at the lower end of the body A, and a lower end of the body A which rolls when the body A is tilted. Sphere C that opens and closes the switching contact B by moving away from it, and cover D that is fitted on the upper end of body A
And are equipped with.

More specifically, the switching contact portion B is a body
At the lower end of A, the semicircular contact portions B ₁ and B ₂ are insulated from each other and are arranged so as to face each other so as to form an arcuate hole. Then, as shown in FIG. 11, when the body A is in a natural state where it is not tilted, the conductive spherical body C is fitted into the arcuate hole and comes into contact with both the contact portions B ₁ and B ₂ to open and close. The contact point B is closed, and when the body A falls down and tilts at a predetermined angle or more as shown in Fig. 12, the sphere C rolls and both arc-shaped holes, that is, contact points B ₁ and B ₂ When it is separated from, the switching contact B is opened.

[0005]

In the conventional fall detection switch described above, the sphere C fits into the arc-shaped hole provided at the lower end of the body A and contacts both the contact portions B ₁ and B _2. The contact point B is closed, but the contact points are at least three rigid body contacts, so if the sphere C moves even a little due to vibration, the contact point will fluctuate and the contact becomes unstable. Sometimes.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a fall detection switch in which the contact of an opening / closing contact portion is reliable.

[0007]

In order to solve the above-mentioned problems, the object of claim 1 is to provide an insulating body which is hollowed out in a substantially mortar shape and has a narrowed lower end, and an opening / closing contact provided at the lower end of the body. A fall detection switch including a ball, a sphere that rolls when the body is tilted to separate from the lower end of the body to open the switching contact part, and a cover that is fitted to the upper end of the body. A movable spring is provided to close the opening / closing contact portion by being pressed by.

According to a second aspect of the present invention, in the first aspect, the movable spring is provided with a start point setting portion for setting a pressing start point of the spherical body.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the body is provided with an end point restricting portion for restricting a pressing end point of the spherical body.

[0010]

According to the first aspect of the present invention, the movable spring pressed by the weight of the sphere bends to close the opening / closing contact portion with a predetermined contact pressure, so that the sphere moves due to vibration or the like. However, since the movable spring bends and absorbs the movement, the contact point is difficult to change.

According to the second aspect of the present invention, since the starting point setting portion for setting the pressing starting point of the spherical body is provided in the movable spring, the stroke of the movable spring is set so that the opening / closing contact portion has a predetermined contact pressure. When setting, the position of the movable spring with which the sphere first abuts does not change according to the bending angle, as in the case where the bending angle of the movable spring is changed. The stroke can be set reliably because the movable spring starts to be pressed after the first contact.

According to the third aspect of the present invention, if the impact is applied to the sphere, the end point regulating portion provided on the body is set within a range in which a predetermined contact pressure can be secured,
Since the sphere comes into contact with the end point regulating portion and the pressing end point is regulated, the movable spring is not deformed by receiving excessive pressing force due to impact from the sphere.

[0013]

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

Reference numeral 1 denotes a body, which is made of an insulating material such as a synthetic resin and integrally molded with terminal plates 11 and 12 described later to form a substantially bottomed cylindrical shape. It is made narrower, and a circular counterbore is formed in the center of its lower end.
1a is provided, and locking projections 1b that are locked when a cover 4 described later is fitted are provided on the outer peripheral surface of the cylinder at four-direction positions.

The terminal plates 11 and 12 are made of a metal material such as a copper alloy and are formed in a flat plate shape by providing a semicircular arc-shaped notch along the counterbore 1a of the body 1 at the center, and both semicircles. The arcuate notches are integrally formed on the lower end of the body 1 so as to be insulated from each other and face each other in an arcuate shape. This terminal board
11, 12 are terminals 11a, 11b and 12a, 12b which are electrically connected to a printed circuit board or the like by bending a portion of the body 1 derived from the outer peripheral surface of the cylinder at a right angle along the outer peripheral surface,
Further, the mortar-shaped portion of the body 1 is provided with exposed surfaces 11c and 12c at positions facing each other on both sides of the counterbore 1a.

Reference numeral 2 denotes an opening / closing contact portion having a movable spring 21. Specifically, the movable spring 21 is made of a thin plate conductive spring material and is formed in a long shape with its center portion curved to match a sphere 3 described later, and one end portion thereof is welded and fixed to one exposed surface 11c. The movable contact 2a provided at the other end is arranged to face the other exposed surface 12c by being separated by its own spring force.

Reference numeral 3 denotes a sphere, which is formed by metal-plating a sphere processed by a metal material such as iron. When the movable spring 21 is pressed by its own weight, the spherical body 3 bends and the movable contact 2a contacts the exposed surface 12c of the terminal plate 12 with a predetermined contact pressure, whereby the terminal plate 11 and 12 are connected via a movable spring 21 to close the switching contact portion 2 as shown in FIG.

Reference numeral 4 denotes a cover, which is made of an insulating material such as synthetic resin and is formed into a substantially disc shape. Grooves are provided along the outer peripheral edge, and locking pieces 4a are provided at four positions on the outer peripheral surface. There is. The cover 4 has a ring 4b whose outer peripheral edge has elasticity and is fitted into the upper end opening of the body 1, and the locking pieces 4a are engaged with the locking protrusions 1b of the body 1, respectively. Stop and fit on the top of body 1.

The fall detection switch described above is provided with terminals 11a, 11
b and 12a and 12b are electrically connected and fixed to a printed circuit board, etc., and housed in equipment that requires tipping detection such as an oil stove. And in the natural posture shown in FIG.
As described above, the movable spring 21 is pressed by the own weight of the sphere 3 to close the open / close contact 2 as shown in FIG.
When the device falls down and the body 1 tilts more than a predetermined amount as shown in Fig. 2, the sphere 3 rolls away from the lower end of the body 1 and does not press the movable spring 21, and the movable spring 21 uses its own spring force. When the movable contact 2a returns and separates from the exposed surface 12c of the terminal plate 12, it is detected that the open / close contact portion 2 shown in FIG. 4 opens and falls.

In such a fall detection switch, as described above, the movable spring 21 pressed by the weight of the spherical body 3 is used.
The bending causes the switching contact 2 to close with a predetermined contact pressure. Therefore, unlike the conventional example where at least three contact points are made by rigid bodies, the sphere 3 moves due to vibration or the like. However, since the movable spring 21 bends and absorbs the movement, the contact point is less likely to change, and therefore the opening / closing contact portion
The contact of 2 becomes reliable.

Next, a second embodiment will be described with reference to FIGS. 5 and 6. This is different from the first embodiment only in the structure of the movable spring 21, and the members having substantially the same functions as those in the first embodiment are designated by the same reference numerals.

That is, the movable spring 21 is provided with a starting point setting portion 21a for setting the pressing starting point of the spherical body 3. As shown in FIG. 5, the starting point setting portion 21a is a protruding portion that is protruded toward the sphere 3 side by bending the central portion of the movable spring 21 that is curved according to the sphere 3 over the entire plate width. Has been formed.

Further, FIG. 6 shows a modification thereof, in which the starting point setting portion 21a is made to project from one point in the center of the plate width rather than over the entire plate width at the center of the movable spring 21. Formed as a protruding portion.

In either of the fall detection switches shown in FIGS. 5 and 6, since the movable spring 21 is provided with the starting point setting section 21a for setting the pressing starting point of the sphere 3, the opening / closing contact section 2 has a predetermined opening / closing point. When setting the stroke of the movable spring 21 so as to obtain the contact pressure, as in the case where the bending angle of the movable spring 21 is changed, the movable spring 21 with which the sphere 3 comes into contact first
The position of does not change depending on the bending angle, and the movable spring 21 must be pressed first after it first comes into contact with the starting point setting part 21a provided on the movable spring 21. Contact reliability of 2 is higher.

Also, when changing the pressing start point, the movable spring
When the bending angle of 21 is changed, it is necessary to replace the entire mold of the movable spring 21 and machining is troublesome, whereas the starting point setting portion 21a only has a protruding portion at the center of the movable spring 21. Therefore, the mold can be easily changed if the protruding part is manufactured as a nesting mold that can be easily replaced.

Next, a third embodiment will be described with reference to FIGS. This is different from the first embodiment only in the structure of the body 1, and the members having substantially the same functions as those in the first embodiment are designated by the same reference numerals.

That is, the body 1 is provided with an end point regulating portion 1c which regulates the pressing end point of the spherical body 3. As shown in FIGS. 7 and 8, the end-point restricting portion 1c is a protruding portion that protrudes from one point on both sides of the movable spring 21 at the bottom of the circular counterbore 1a provided at the center of the lower end of the body 1. Is formed as. The height is set as high as possible within a range where the opening / closing contact portion 2 can secure a predetermined contact pressure when the spherical body 3 presses the movable spring 21 by its own weight.

Further, FIGS. 9 and 10 show a modification thereof, in which the end point regulating portion 1c is the counterbore hole 1a of the body 1.
At the bottom of each of the movable springs 21, not at one point on both sides of the movable spring 21, but as a protruding portion that protrudes in a substantially arcuate shape in accordance with the curved surface of the spherical body 3, the height is the same as that described above.

In any of the fall detection switches shown in FIGS. 7, 8 and 9 and 10, when an impact is applied to the sphere 3, the sphere 3 comes into contact with the end point regulating portion 1c to regulate the pressing end point. Therefore, the movable spring 21 is not deformed by the excessive pressing force of the spherical body 3, and the contact reliability of the opening / closing contact portion 2 is further enhanced.

If both the starting point setting section 21a of the second embodiment and the end point regulating section 1c of the third embodiment are provided,
Further, it goes without saying that the contact reliability of the switching contact portion 2 is further enhanced.

In each of the embodiments, the spherical body 3
Uses a metal-plated product that is made into a spherical shape with a metal material such as iron, but does not have a metal plating applied to the metal material or a spherical material that is formed into a spherical shape with a molding material. It may be applied.

[0032]

According to the first aspect of the present invention, since the opening / closing contact portion is closed with a predetermined contact pressure due to the bending of the movable spring pressed by the weight of the spherical body, the spherical body moves due to vibration or the like. However, since the movable spring bends and absorbs the movement, the contact point is unlikely to fluctuate, and thus the contact of the opening / closing contact portion becomes reliable.

In addition to the effect of claim 1, since the movable spring is provided with a start point setting portion for setting the pressing start point of the spherical body, the opening and closing contact portion has a predetermined contact pressure. When setting the stroke of the movable spring so that, as in the case where the bending angle of the movable spring is changed,
The position of the movable spring with which the sphere first comes into contact does not change according to the bending angle, and the movable spring is pressed first after it first comes into contact with the start point setting part provided on the movable spring, so the stroke can be set reliably. Further, the contact reliability of the switching contact part becomes higher.

Further, in addition to the effect of claim 1 or 2, the third aspect is within a range in which a predetermined contact pressure can be secured by the end point regulating portion provided on the body even when an impact is applied to the sphere. If the setting is made, the sphere abuts the end point regulation part and the pressing end point is regulated, so that the movable spring does not deform due to excessive pressing force due to impact from the sphere, and the contact of the opening / closing contact part Higher reliability.

[Brief description of drawings]

FIG. 1 is a front sectional view showing a first embodiment of the present invention.

FIG. 2 is a front sectional view showing a state in which the body of the same is tilted.

FIG. 3 is a plan view showing a case where the above cover is not fitted.

FIG. 4 is a circuit configuration diagram of the above.

FIG. 5 is a front sectional view showing a second embodiment of the present invention.

FIG. 6 is a front sectional view showing a modification example of the above.

FIG. 7 is a front sectional view showing a third embodiment of the present invention.

FIG. 8 is a plan view of the case where the above cover is not fitted.

FIG. 9 is a front sectional view showing a modification example of the above.

FIG. 10 is a plan view of the case where the above cover is not fitted.

FIG. 11 is a front sectional view showing a conventional example.

FIG. 12 is a front cross-sectional view showing a state in which the body of the same is tilted.

FIG. 13 is a plan view of the case where the above cover is not fitted.

[Explanation of symbols]

 1 Body 1c End point restriction part 2 Open / close contact part 3 Sphere 4 Cover 21 Movable spring 21a Start point setting part

Claims (3)

[Claims] 1. A body made of an insulating material having a substantially mortar-like shape and a narrowed lower end, an opening / closing contact portion provided at the lower end of the body, and an opening / closing contact portion that rolls when the body is tilted to move away from the lower end of the body. In a fall detection switch provided with a sphere that opens the circuit, and a cover that is fitted to the upper end of the body, a movable spring that is pressed by the weight of the sphere to close the opening / closing contact portion is provided. Fall detection switch. 2. The start point setting portion for setting the pressing start point of the sphere is provided on the movable spring.
The fall detection switch described. 3. The fall detection switch according to claim 1, wherein the body is provided with an end point regulating portion that regulates a pressing end point of the spherical body.