JPH0594917U - Emergency alarm push button switch - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a push button switch for an emergency alarm, in which a change in the pressing load against repeated use or rain is small. [Structure] The pressing portion 2a of the push button 2 is exposed to the outside of the housing 1, and the column portion 2b of the push button 2 is pressed and sandwiched inside the housing 1 by a pair of plate-shaped springs 5a and 5a. The tip end 3b of the connecting bar 3 is supported by a shaft, and the end portion 3b of the connecting bar 3 is engaged with the side surface of the pillar portion 2b.
The c is connected to the lower part of the return button 4 whose upper part can project from the surface of the housing 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention also relates to the structure of an emergency alarm push button switch used in fire fighting equipment and the like.

[0002]

[Prior Art]

 FIG. 4 is a diagram showing a conventional example of an emergency alarm push button switch.

As shown in FIG. 4, a conventional emergency alarm push button switch 20 includes a housing 21, a push button 22 composed of a push cover 22a and a support portion 22b, and a self-holding for holding the ON state of the push button 22 by itself. It has a lever 23 and an electric contact piece 24 composed of a movable contact piece 24a and a fixed contact piece 24b.

The push button 22 is supported in the housing 21 by a coil spring 22c. Further, the self-holding lever 23 has a protrusion 23a capable of engaging with an engaging portion 22d provided on the pressing cover 22a, and is supported by a coil spring 23c on the inner surface of the housing 21. ..

FIG. 4 is a diagram showing the OFF state of the emergency alarm push button switch 20, in which the movable contact piece 24a and the fixed contact piece 24b are separated from each other. The upper surface of the protrusion 23a of the self-holding lever 23 is an inclined surface 23d, and the engaging portion 22d of the pressing cover 22a is in contact with the inclined surface 23d. When the pressing cover 22a is pushed from the OFF state shown in FIG. 4, the engaging portion 22d pushes the self-holding lever 23 to the left in the figure, and the state shown in FIG. 5 is obtained. Immediately, the column portion 22b moves downward in the figure, and its tip pushes the movable contact piece 24a of the electric contact piece 24 to bring it into contact with the fixed contact piece 24b, so that the emergency alarm push button switch 20 is turned on. It becomes a state. At the same time, since the engaging portion 22d rides over the protrusion 23a and is located therebelow, the self-holding lever 23 returns to its original state by the elastic force of the coil spring 23c. When the pressing force applied to the push button 22 is removed, the push button 22 tries to return to the OFF state due to the elastic force of the coil spring 22c, but the locking portion 22d of the pressure cover 22a has the protrusion portion 23a of the self-holding lever 23. Since the lower side surface is engaged, the emergency alarm push button switch 20 maintains the ON state, as shown in FIG. In the ON state of FIG. 5, when the self-holding lever 23 is manually moved to the left in the figure, the engagement state of the engaging portion 22d of the pressing cover 22a and the protruding portion 23a of the self-holding lever 23 is changed. When the push button 22 is released, the push button 22 returns to the OFF state by the elastic force of the coil spring 22c.

[0006]

[Problems to be solved by the device]

 When the emergency warning push button switch 20 is used for fire fighting equipment, the prescribed value of the pressing load (hereinafter, referred to as "operating pressing load") required to press the push button 22 exceeds 2 kg and 8 kg. The following are considered appropriate.

However, in the conventional configuration, since the operation pressing load also depends on the frictional resistance of the inclined surface 23d of the protrusion 23a of the self-holding lever 23, water drops such as rain adhere to the inclined surface 23d. Alternatively, when the inclined surface 23d is worn by repeated use, the frictional resistance value on the inclined surface 23d decreases, and the pressing load of the push button 22 becomes smaller than the appropriate value.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a push button switch for an emergency alarm in which the change in the pressing load is small with repeated use or rain. is there.

[0009]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention has a push button for an emergency alarm that opens and closes an electric contact by the push operation in the axial direction of a push button that exposes the push portion outside the housing and inserts a part of the support portion inside the housing. In the switch, the pillar of the push button is pressed and sandwiched by a pair of leaf springs inside the housing so that a resistance force acts in a direction opposite to the pushing direction when the push button is pressed. Is engaged with the side surface of the column, and the terminal end of the connecting bar is connected to the lower portion of the return button whose upper portion can project from the surface of the housing. is there .

[0010]

[Action]

 The emergency alarm push button switch of the present invention, when the push button is not pushed (hereinafter referred to as "OFF state"), when the push button is pushed with a certain load or more, the push button is suddenly displaced in the pushing direction. , The push button is completely depressed (hereinafter referred to as "ON state"), and the electric contact piece is closed. The pressing load necessary for pressing is obtained by a leaf spring. The leaf spring follows the displacement of the push button while deforming. Further, the support bar of the push button is engaged with the tip end of the connecting bar having the intermediate part supported, and the return button is connected to the terminal end of the connecting bar. The return button interlocks with the push button via the connecting bar, and when the push button is in an ON state, a part of the return button projects from the surface of the housing. When the return button is pressed in the ON state, the push button is returned to the OFF state.

[0011]

【Example】

 The present invention will be described below with reference to the drawings showing its embodiments.

FIG. 1 is a sectional view showing an embodiment according to the present invention, and FIG. 2 is a bottom view taken along the line AA of FIG.

In FIGS. 1 and 2, reference numeral 2 is a push button having a pressing portion 2 a and a support portion 2 b. The pressing portion 2a is a portion to be manually pressed, and the supporting column portion 2b pushes the movable contact piece 6a of the electric contact piece 6 to bring it into contact with the fixed contact piece 6b so that the electric contact piece 6 is held. Make a circuit. The pressing portion 2a is exposed to the outside of the housing 1, a part of the supporting pillar portion 2b is inserted into the housing 1, and an electric contact piece 6 is arranged in the tip end direction of the supporting pillar portion 2b.

Reference numeral 3 denotes a connecting bar that links the push button 2 and the return button 4. The connecting bar 3 has a fulcrum 3a at its intermediate point, and the fulcrum 3a is pivotally supported. A tip portion 3b of the connecting bar 3 is rotatably inserted into a groove portion provided in the column portion 2b of the push button 2, and a terminal end portion 3c of the connecting bar 3 can be projected outside the housing 1. It is connected to the button 4 so as to have a hinge action.

Reference numeral 5 is a plate integrally having a pair of plate-shaped springs 5a, 5a for holding the push button 2 by itself. The plate-shaped spring 5a has a curved portion 5b in the middle thereof, and a spring action is created by the bending of the curved portion 5b. The plate 5 itself is fixed in the housing 1, and the tip ends 5c and 5c of the plate-shaped springs 5a and 5a are rotatably inserted into the groove portions provided in the push button 2, respectively. ing. The column 2b of the push button 2 is in a state of being sandwiched by the two plate springs 5a, 5a from both side surfaces.

Hereinafter, the direction in which the pressing portion 2a of the push button 2 is manually pressed (downward in the drawing) is referred to as “pressing direction”, and the direction opposite to the pressing direction (upward in the drawing) is “reverse pressing”. Say "direction".

FIG. 1 is a view showing an OFF state, and the plate-shaped springs 5a, 5a support the column portion 2b of the push button 2 so as to push up the push button 2 in the reverse pressing direction. Further, the movable contact piece 6a and the fixed contact piece 6b of the electric contact piece 6 are connected to the internal circuit of the fire fighting equipment, and in the OFF state, the movable contact piece 6a and the fixed contact piece 6b are connected to each other. The contacts are separated.

When the pressing portion 2a of the push button 2 is pressed in the pressing direction from the OFF state of FIG. 1, a resistance force acts in the reverse pressing direction by the spring force of the plate springs 5a, 5a. When the pressing portion 2a of the push button 2 is further pressed against the resistance force, the pressing force exceeds the resistance force of the leaf springs 5a, 5a when pressed by a certain pressing load, and the push button 2 suddenly moves. It will be displaced in the pressing direction. With the displacement of the push button 2, the tip ends of the leaf springs 5a, 5a follow the displacement of the push button 2. When the push button 2 is completely displaced in the pressing direction, as shown in FIG. 3, the plate springs 5a, 5a support the push button 2 so as to push it down in the pressing direction. Is held in the position of FIG. At the same time, the tip of the column 2b pushes the movable contact piece 6a to bring it into contact with the fixed contact piece 6b to turn on the electric contact piece 6. Further, the return button 4 projects on the surface of the housing 1 in conjunction with the movement of the push button 2.

Further, in the ON state of FIG. 3, when the return button 4 protruding from the housing 1 is pressed, the push button 2 is displaced in the reverse pressing direction and returns to the OFF state of FIG. The pressing load of the return button 4 at this time can be reduced by adjusting the position of the fulcrum 3a of the connecting bar 3, so that the pressing button 2 can be easily pushed in the reverse pressing direction even if pressed with a light force. It can be displaced.

[0020]

[Effect of the device]

 As described above, in the emergency alarm push button switch of the present invention, since the pressing load of the push button is obtained by the spring force of the plate spring, the operation pressing load does not change due to repeated use or water drops.

[Submission date] January 28, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction content]

[0016] In the following, it said means a person direction to manually presses the pressing portion 2a of the push button 2 and "pressing direction" refers to a direction towards the opposite of the "reverse pressing direction" is the pressing pressure direction.

[Submission date] September 10, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction content]

[0001] The present invention relates to the structure of the emergency alarm for a push button switch which is used in fire-fighting equipment and the like.

[Brief description of drawings]

FIG. 1 is a sectional view showing an OFF state of a first embodiment of the present invention.

FIG. 2 is a bottom view of AA of FIG. 1 showing a first embodiment of the present invention.

FIG. 3 is a sectional view showing the ON state of the first embodiment of the present invention.

FIG. 4 is a cross-sectional view showing an OFF state of a conventional example.

FIG. 5 is a sectional view showing an ON state of a conventional example.

[Explanation of symbols]

 1 Housing 2 Push Button 2a Pushing Part 2b Strut Part 3 Connecting Bar 3a Support Point 4 Return Button 5a Leaf Spring

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[Procedure amendment]

[Submission date] January 28, 1992

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

[Procedure 3]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

[Figure 3] ─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] September 10, 1992

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 4

[Correction method] Change

[Correction content]

[Figure 4]

[Procedure 3]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 5

[Correction method] Change

[Correction content]

[Figure 5]

Claims (1)

[Scope of utility model registration request] 1. A push button switch for an emergency alarm, which opens and closes an electric contact piece by an axial pushing operation of a push button in which a pushing portion is exposed outside the housing and a part of a supporting column is inserted inside a housing, wherein the push button is provided. In order to exert a resistance force in the direction opposite to the pressing direction when pressing, the column portion of the push button is pressed and sandwiched by a pair of plate-shaped springs inside the housing, and the tip of the connecting bar with the intermediate portion supported. A push button switch for an emergency alarm, characterized in that a portion is engaged with a side surface of the column portion, and an end portion of the connecting bar is connected to a lower portion of a return button whose upper portion can project from the surface of the housing.