JP2874491B2 - Seismic sensor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic reset type seismic sensor which performs an automatic fire extinguishing operation at the time of abnormal vibration or impact of a stove, a fan heater or the like.

[0002]

2. Description of the Related Art Conventionally, as a seismic device of this kind, as shown in FIG. 5, a fulcrum 62 of a switch mounting portion 61 of a base member 60 and a fulcrum 64 of a cover member 63 swing the base of a lever 65. And the plunger 66 positioned on the front side of the lever 65 is passed through the hole 68 of the mortar-shaped receiving portion 67 of the cover member 63, and is inserted into the steel ball seat 68 a of the receiving portion 67 of the cover member 63. There is a type in which a steel ball 69 is placed and the steel ball 69 is brought into contact with the steel ball contact portion 70 of the plunger 66.

In this case, the plunger 66 at the distal end of the lever 65 is pushed by a steel ball 69 to urge the lever 65 downward, and is fixed to an intermediate portion of the lever 65 to one terminal 72. The tip of the movable piece 71 is in contact, and the movable piece 71 is in contact with the other terminal 73.

[0004] When the seismic device thus constructed is subjected to vibration, the steel ball 69 rolls, the pressing of the plunger 66 is released, the lever 65 is displaced upward, and the movable piece 71 is moved. The movable piece 71 is displaced upward, and the movable piece 71 is separated from the other terminal 73, so that the switch is switched.

[0005] The switch unit of the seismic device comprises a lever 65 and a movable piece 71 urged downward by the lever 65 to come into contact with the other terminal 73. The piece 71 was a separate member.

[0006]

However, in the above-mentioned conventional seismic sensor, since the lever 65 of the switch portion and the movable piece 71 are separate members, the steel ball 69 is operated by vibration. Since the operating load of the lever 65 and the movable piece 71 acts as a reaction force, the lever 65 and the movable piece 7
1 is susceptible to the variation of the load, and there is a problem that the operation at the time of detecting the vibration is unstable. Further, there is a problem that the lever 65 and the movable piece 71 are difficult to assemble because they are separate members.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a seismic sensor which is stable in detecting vibration and is easy to assemble.

Another object of the present invention is to provide a seismic device which can operate stably without the operation load of the lever and the movable piece acting as a reaction force.

[0009]

According to the first aspect of the present invention, there is provided a sensing unit for sensing a vibration or an impact, a switch unit for converting the sensed vibration or the like into a switch signal, and a sensing unit and a switch unit. And a switch part having a terminal part and a switch member insert-molded in the housing part, and the switch member is formed by punching out a movable piece made of a plate material having a spring property and punching out the movable piece. The housing portion is formed of a base member and a cover member that fit together, and the fitting portion is fitted to a fitting portion between the base member and the cover member.
A sealing resin filling portion is formed concentrically with the joint portion, and the resin filling portion is filled with a sealing resin.

According to a second aspect of the present invention, there is provided a sensing unit for sensing a vibration or an impact, a switch unit for converting the sensed vibration or the like into a switch signal, and a housing unit for accommodating the sensing unit and the switch unit. The switch portion has a terminal portion and a switch member which are insert-molded in the housing portion, and the switch member has a movable piece made of a plate material having a spring property and a tongue-shaped piece formed by punching out the movable piece and integrally forming the movable piece. And a fixing portion of the movable piece is fixed to the terminal portion, and a free end of the movable piece is formed on a lower surface of a steel ball guide member constituting the sensing portion. Characterized in that it is positioned at

According to a third aspect of the present invention, there is provided a sensing unit for sensing a vibration or an impact, a switch unit for converting the sensed vibration or the like into a switch signal, and a housing unit for accommodating the sensing unit and the switch unit. The switch portion has a terminal portion and a switch member which are insert-molded in the housing portion, and the switch member has a movable piece made of a plate material having a spring property and a tongue-shaped piece formed by punching out the movable piece and integrally forming the movable piece. The movable piece is fixed to the terminal part, and the free end of the movable piece is positioned at the projection formed on the housing. Features.

[0012]

According to the present invention, when operated by the sensing unit, the operating load of the lever and the movable piece does not act as a reaction force, and the operation is less affected by the variation in the load of the lever and the movable piece. The operation at the time of vibration detection is stabilized. Further, since the lever and the movable piece are integrated, it is easy to assemble.

Further, according to the present invention, when operated by the sensing unit, the operation load of the lever and the movable piece does not act as a reaction force, and a stable operation can be performed.

Further, according to the present invention, the operation of the movable piece is stabilized by keeping the free end of the movable piece in contact with the stopper.

Further, according to the first aspect of the present invention, dust and oil and water are prevented from entering the housing portion, and malfunction of the switch portion due to such entry is prevented.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a longitudinal sectional view of an embodiment of a seismic sensor according to the present invention, and FIG.
FIG. 1 is a sectional view taken along the line XX of FIG. 1 and FIG. 3 is a perspective view of a switch member.

This seismic sensor has a base member 1 and a cover member 2
And a guide member 3, and the base member 1 and the cover member 2 constitute a housing part A of the seismic device. A cylindrical portion 1a, a cover member fitting portion 1b, and a sealing resin filling portion 1c are formed concentrically on the upper surface of the base member 1, and a switch mounting portion 4 is provided at the bottom of the base member 1. The switch mounting section 4 has a switch section 5 mounted thereon. Further, a mounting portion 1 is provided on a lower outer peripheral portion of the base member 1.
d is provided.

The switch section 5 includes terminal sections 7 and 8 which are located on the surface of the switch mounting section 4 and are insert-molded in the base member 1 and a switch member 9. As shown in FIG. 3, the switch member 9 is formed by punching a tongue-shaped lever 10 out of a plate having spring properties, and a portion other than the lever 10 is formed as a movable piece 11.
The base of the movable piece 11 is bent into a side crank shape, and its end is a fixed portion 11a.

The switch member 9 is formed by caulking the fixed portion 11a of the movable piece 11 to the terminal portion 7 and fixing it by spot welding or the like.
A projection 1 formed on one side of the lower surface of the guide member 3
2 and is positioned.

The guide member 3 has a mortar shape, and a central portion thereof is a steel ball seat portion 13. A plunger hole 14 is provided in the center of the steel ball seat portion 13. A plunger 15 is inserted through the plunger hole 14 in a penetrating state, and the lower end of the plunger 15 is in contact with the tip side of the lever 10 of the switch member 9.

Then, the guide member 3 is placed on the cylindrical portion 1a of the base member 1, and the steel ball 16 is placed on the steel ball seat 13 at the center of the guide member 3, and the steel ball 16 is placed on the steel ball contact portion 15a of the plunger 15. The steel balls 16 are brought into contact with each other to form a seismic sensor. In this state, the fitting portion 17 of the cover member 2 is fitted with the cover member fitting portion 1b of the base member 1, and the end surface of the fitting portion 1b and the upper surface of the tubular portion 1a are used to guide the guide member 3. The peripheral portion is sandwiched, the sealing resin filling portion 1c is filled with the sealing resin 18, and the cover member 2 is fixed to the base member 1, thereby forming a seismic device.

In this case, the plunger 15 in contact with the tip of the lever 10 is pushed by a steel ball 16 to urge the lever 10 downward, and the intermediate portion of the movable piece 11 is connected to the other terminal 8. Contact 8a.

When the seismic device thus constructed receives vibration, the steel ball 16 rolls and the plunger 15 is released from being pressed, the lever 10 is displaced upward, and the movable piece 11 is moved. The movable piece 11 is displaced upward and separates from the contact portion 8a of the other terminal portion 8, and the switch is switched.

In the above embodiment, the switch member 9
Is formed by punching a tongue-shaped lever 10 from a plate material having a spring property, and excluding the lever 10 from a movable piece 11 and integrating the lever 10 and the movable piece 11 with each other. When the ball 16 operates by vibration, the operation load of the lever 10 and the movable piece 11 does not act as a reaction force, and the operation is less affected by the variation in the load of the lever 10 and the movable piece 11. , Operation at the time of vibration detection is stabilized. Further, since the lever 10 and the movable piece 11 are integrated, it is easy to assemble.

(Embodiment 2) FIG. 4 is a longitudinal sectional view of another embodiment of a seismic sensor according to the present invention. This seismic device includes a base member 21. The base member 21 has a cup shape with an open upper surface and has a peripheral wall portion 21a. A steel ball seat 21 b formed of a concave portion is formed in the center of the bottom surface of the base member 21, and a conical surface portion 21 c is formed below the inner peripheral surface of the base body 21. A mounting portion 22 is formed on a lower outer peripheral side of the base member 21. A cover mounting portion 23 is formed above the peripheral wall portion 21a of the base member 21, and a cover member 24 and a guide member 25 are fitted into the cover mounting portion 23, and an outer peripheral portion of the cover member 24 is formed. And the peripheral wall portion 21a, a sealing resin filling portion 26 is formed,
The sealing resin filling portion 26 is filled with the sealing resin 27, and the cover member 24 and the guide member 25 are fixed to the upper portion of the peripheral wall portion 21 a of the base member 21. The base member 21 and the cover member 24 constitute a housing part A of the seismic device.

A switch mounting section 29 is provided on the ceiling side of the housing section A.
A switch unit 30 is mounted on 9. The switch unit 30 includes terminal portions 31 and 32 insert-molded on the inner surface of the cover member 24 and a switch member 33. The switch member 33 has the same configuration as the switch member 9 of the first embodiment. is there. That is, the switch member 9 is formed by stamping and forming a tongue-shaped lever 10 on a plate material having a spring property, and excluding the lever 10 from a movable piece 11 and integrating the lever 10 and the movable piece 11. Yes,
The base of the movable piece 11 is bent into a side crank shape, and its end is a fixed portion 11a.

A projection 24a is formed on the inner surface of the cover member 24, a plunger hole 34 is formed in the center of the guide member 25, and a projection 35 is formed on the upper surface. Each is formed.

The plunger 36 has a contact portion 3 at its center.
6a, and the periphery of the contact part 36a is
, And the lower end portion is formed as a steel ball contact portion 36c.

The switch member 33 has the fixed portion 11a of the movable piece 11 caulked to the terminal portion 31 and is fixed by spot welding or the like.
1b is positioned in contact with a protrusion 35 formed on the upper surface of the guide member 25. A steel ball 37 serving as a vibration and impact sensing unit is provided in a steel ball seat 21b at the center of the bottom surface of the base member 21, and a plunger 36 is provided in the plunger hole 34 so as to be vertically movable. The steel ball contact portion 36c of the plunger 36 contacts the steel ball 37 to form a seismic sensor.

The tip of the lever 10 is in contact with a contact portion 36a at the upper end of the plunger 36. In this case, the plunger 36 in contact with the tip of the lever 10 is pushed by the steel ball 37 to urge the lever 10 upward, and the intermediate portion of the movable piece 11 contacts the contact 32 a of the other terminal 32. doing.

When the thus-configured seismic sensor is subjected to vibration, the steel ball 19 rolls and the push-up of the plunger 36 is released, the plunger 36 is lowered, and the movable piece 11 is moved via the lever 10. Is lowered, and this movable piece 1
1 is separated from the contact point 32a of the other terminal section 32, and the switch section 30 is switched.

In the above embodiment, the switch member 3
3 is formed by punching out a tongue-shaped lever 10 from a plate material having spring properties, and excluding the lever 10 from a movable piece 11 and integrating the lever 10 and the movable piece 11 with each other. When the steel ball 37 operates by vibration, the operation load of the lever 10 and the movable piece 11 does not act as a reaction force, and the operation is less affected by the variation in the load of the lever 10 and the movable piece 11. The operation at the time of vibration detection is stabilized. Further, since the lever 10 and the movable piece 11 are integrated, it is easy to assemble.

The switch portion 30 is located above the housing portion A. The switch portion 30 is of a normally closed type, and the rolling up of the steel ball 19 releases the push-up of the plunger 36 so that the plunger 36 is released. The movable piece 11 is lowered via the lever 10, the movable piece 11 is separated from the contact 32 a of the other terminal part 32, and the switching of the switch unit 30 is performed.
Stable operation becomes possible.

[0035]

As described above, according to the present invention, a sensing unit for sensing vibration and shock, a switch unit for converting the sensed vibration and the like into a switch signal, and the sensing unit and the switch unit are housed. and a housing portion, the switch portion and a and a switch member terminal portion which is insert molded into the housing part, the switch member is a plate member having a spring property
And a tongue formed by punching out this movable piece
Since it is composed of a flaky lever, when actuated by the sensing unit, the operating load of the lever and the movable piece does not act as a reaction force. And the operation at the time of vibration detection is stabilized. Further, since the lever and the movable piece are integrated, it is easy to assemble.

Further, according to the present invention, the free end of the movable piece is positioned on the projection formed on the lower surface of the steel ball guide member constituting the sensing portion or the projection formed on the housing portion. Therefore, even if the free end of the movable piece is positioned at the projection, the operation of the movable piece can be stabilized, and the performance of the seismic sensor itself can be improved. .

Further, according to the present invention, the housing portion is constituted by a base member and a cover member which are fitted to each other, and is formed concentrically at a fitting portion between the base member and the cover member. Since the resin-filled portion is filled with the sealing resin, dust and oil-water can be prevented from entering the housing portion, and malfunction of the switch portion due to such entry can be eliminated. From a surface point of view, it can contribute to improving the performance of the seismic sensor itself.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of one embodiment of a seismic sensor according to the present invention.

FIG. 2 is a sectional view taken along the line XX of FIG. 1;

FIG. 3 is a perspective view of a switch member.

FIG. 4 is a sectional view of another embodiment of the seismic sensor according to the present invention.

FIG. 5 is a cross-sectional view of a conventional seismic sensor.

[Explanation of symbols]

 A housing part 1 base member 5 switch part 7,8 terminal part 9 switch member 10 lever 11 movable piece 11a fixed part 11b free end part 16 steel ball (sensing part)

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) G01H 1/00-1/16

Claims (3)

(57) [Claims] 1. A sensor for sensing vibration or shock, a switch for converting sensed vibration or the like into a switch signal, and a housing for accommodating the sensor and the switch, wherein the switch is a housing. The terminal has a terminal part and a switch member which are insert-molded in the part, and the switch member is constituted by a movable piece made of a plate material having spring properties and a tongue-shaped lever formed by punching out the movable piece and integrally forming the movable piece. The housing portion includes a base member and a cover member which are fitted to each other , and a sealing resin filling portion is formed concentrically with the fitting portion between the base member and the cover member.
Form, seismoscope, characterized in that filled with sealing resin to the resin filling portion. 2. A sensor for sensing vibration or shock, a switch for converting sensed vibration or the like into a switch signal, and a housing for accommodating the sensor and the switch, wherein the switch is a housing. The terminal has a terminal part and a switch member which are insert-molded in the part, and the switch member is constituted by a movable piece made of a plate material having spring properties and a tongue-shaped lever formed by punching out the movable piece and integrally forming the movable piece. A fixed portion of the movable piece is fixed to the terminal portion, and a free end of the movable piece is positioned on a projection formed on a lower surface of a steel ball guide member constituting the sensing portion. And a seismic sensor. 3. A sensor for detecting vibration or shock, a switch for converting the detected vibration or the like into a switch signal, and a housing for accommodating the sensor and the switch. The terminal has a terminal part and a switch member which are insert-molded in the part, and the switch member is constituted by a movable piece made of a plate material having spring properties and a tongue-shaped lever formed by punching out the movable piece and integrally forming the movable piece. Fixing one end side fixed portion of the movable piece to the terminal portion,
And a free end on the other end side of the movable piece is positioned on a projection formed on the housing.