JPS6021103Y2 - fire extinguisher safety device - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a safety device for fire extinguishers.

Generally, the safety device of a fire extinguisher has a sideways pin hole in a part of the side plate in front of the pivot point of the activation lever, the head opposite to this, or the side of the handle, and the safety device is installed in this pin hole. The plug is inserted sideways to prevent the activation lever from being lowered, and when the fire extinguisher is used, the fire extinguisher is configured to be pulled out to lower the activation lever and start spraying the extinguishing agent.

However, in the event of a fire, people often try to pull out the safety valve while pressing the activation lever downward in a panic, and in this case, the safety valve is subjected to a large shearing force due to the pressing force of the activation lever. In addition, there were problems such as the safety plug becoming distorted and becoming impossible to pull out.

Furthermore, according to the results of recent consumer tests, it has been reported that a top-opening safety stopper is the easiest to operate.

In view of the above points, this invention provides a safety device for a fire extinguisher that allows the safety plug to be easily pulled out even when the activation lever is pressed and that uses an upper pull-out method.

Hereinafter, a description will be given of an embodiment of the configuration of this invention shown in the drawings.

In Figure 1, 1 is the fire extinguisher body, 2 is the head, 3 is the seal, 4 is the head tightening ring, 5 is the high pressure gas cylinder, 6 is the siphon tube, 7 is the chemical injection hole, 8 is the cylinder breaking needle, and 9 is the valve. , 10 is a valve spring, 11 is a handle, and 12 is a starting lever.

The handle 11 is fixed to the head 2, and the tip of an activation lever 12 is pivoted to the tip of the handle 11 via a pivot 20 so as to be able to rotate up and down, and by pressing the activation lever 12 downward, The cylinder breaking needle 8 is pushed down, breaks the sealing plate 5a of the high pressure gas cylinder 5, and destroys the fire extinguisher body 1.
High pressure is applied to the inside, and at the same time valve 9 is opened to release the drug into siphon pipe 6.
The medicine is configured to be able to be ejected from the ejection hole 7 to the outside through the medicine ejection hole 7.

The safety device of this invention, as shown in Figs. 1 and 2,
It consists of a lock lever 13, a hook lever 14, and a safety plug 15.

The lock lever 13 is arranged between the handle 11 and the TFL lever 12, and its lower end is rotatably connected to the handle 11 via a pivot shaft 16.
The upper end has a cam surface 13a that comes into contact with the lower surface of the activation lever 12.

This cam surface 13a is formed so as to generate a rotational force in the direction of collapse of the lock lever 13 when the activation lever 12 is pressed downward.

The hook lever 14 is pivotally attached to the lower surface of the activation lever 12 via a pivot 17, and has a locking pawl 14a at its tip.

This hook lever 14 is an al-lock lever in the upright state.
The locking claw 14a locks on the upper end of the lock lever 1
The upper part of the lock lever 13 is provided with a notch 1 as shown in FIG.
3b.

The hook lever 14 fits into the notch recess 13b, and the locking claw 14a at the tip is engaged with the edge 13c of the notch recess 13b to maintain the upright state of the lock lever 13, and at the same time,
It prevents its lodging and rotation.

A plug hole 13d in the vertical direction is provided at the upper end of the lock lever 13, and plug holes 14b and 12a that coincide with the plug hole 13d are provided in the hook lever 14 and the activation lever 12 when the lock lever 13 is in the upright state. be.

The safety plug 15 is made by bending the top end of the metal rod into a circle and inserting it with your finger (index finger).
A grip ring is formed into which the handle can be inserted to facilitate the withdrawal operation.

In FIG. 2, reference numeral 18 denotes a safety plug holder provided on the upper surface of the activation lever 12, which holds a part of the safety plug 15 by the elasticity of its fork to prevent it from coming out.

When the fire extinguisher is not in use, the safety valve 15 prevents the starting lever 12 from being lowered.

During use, if an attempt is made to pull out the safety plug 15 with the reduction blade still applied to the activation lever 12, the lock lever 1
3 is locked to the hook lever 14, and the hook lever 14 is prevented from rotating by the safety stopper 15, so that no shearing force or the like acts on the safety stopper 15.

That is, the lock lever is activated by the reduction blade that acts on the starting lever 12.
13, the cam surface 13a exerts a rotational force in the direction of collapse, but since this is blocked by the hook lever 14, the upward rotational force of the hook lever 14 acts slightly on the safety plug 15. Just do it.

Now, to explain the force relationship using Fig. 4, first, start lever 1
A tangential rotational force F cos α centered on the pivot shaft 16 is applied to the lock lever 13 by the No. 2 reduction blade F via the cam surface 13 a having an inclination angle α.

The tangential rotational force F cosα of the lock lever 13 rotates the hook lever 14 upward with a tangential rotational force F cosα·sin β about the pivot shaft 17 through the locking pawl 14 a at the tip of the hook lever 14 . try

β is the locking angle between the locking claw 14a and the lock lever 13.

Now, when the upward rotational force of the hook lever 14 acts on the safety plug 15, the magnitude of the shearing force acting on the safety plug 15 is determined by the angle between the hook lever 14 and the safety plug 15 being γ
Then, FCO5α・Sjnβ* sin y
◆...(1).

In FIG. 4, the sizes of the arrows at the positions where each force is applied are shown enlarged sequentially for convenience of explanation, but as is clear from equation (1) above, the shear acting on the safety plug 15 The force is very small, and as is clear from FIG. 4, the force on the safety plug 15 is
・The component force of cosγ acts.

Therefore, the safety stopper 15 can be easily pulled upwards even with the reduction blade applied to the activation lever 12.

When the safety plug 15 is pulled out, the lock lever 13 is rotated by the cam surface 13a in the direction of collapse by the lowering blade of the activation lever 12, and the locking pawl 14a at the tip of the hook lever 14 is elastically deformed. While rotating the hook lever 14 upward, the two are unlocked, and the lock lever 13 is released.
rotates in the direction of collapse, and the activation lever 12 is operated downward.

In other words, the safety plug 15 normally prevents the hook lever 14 from rotating upward, and thereby prevents the lock lever 13 from rotating in the direction of lowering the hook lever 14.
is being prevented.

To explain the above point in more detail, the locking pawl 14a at the tip of the hook lever 14 is slightly elastically deformed.

However, in order for the locking pawl 14a of the hook lever 14 to completely disengage from the lock lever 13, the hook lever 14 must be rotated upward.

A safety plug 15 prevents the hook lever 14 from rotating upward.

The amount of engagement between the lock lever 13 and the hook lever 14 may be very small; rather, the inner surface of the locking pawl 14a may be made into a tapered surface, or the edge 1° 3c of the notch recess 13b of the lock lever 13 may be chamfered. It is desirable that the hook lever 14 be configured so that it receives an upward rotational force due to the rotational force of the lock lever 13 in the direction of collapse.

As explained above, in this invention, the activation lever is pivotally attached to the bundle fixed to the upper part of the fire extinguisher body so that it can be rotated in the vertical direction, and the extinguishing agent can be spouted by pressing down on the activation lever. In this fire extinguisher, a lock lever is provided between the bundle and the activation lever, the lower end of which is pivotally connected to the bundle, and the upper end of which is in contact with the lower surface of the activation lever and has a cam surface that receives the lodging rotational force from the lowering blade of the activation lever. It is arranged so that it can be rotated to stand up and fall down, and is locked to the upper end of the lock lever in the upright state to prevent the lock lever from falling down, and also rotates upward by the rotational force of the lock lever in the direction of falling down to prevent the lock lever from engaging. A hook lever with a locking pawl at the tip for releasing the lock is pivotally attached to the bottom surface of the activation lever so that it can rotate in the vertical direction, and a plug hole is provided in the top end of the lock lever in the vertical direction. - when standing up, a vertical plug hole is provided that corresponds to the above plug hole, and a safety plug that can be pulled upward is inserted into the three plug holes and the plug hole at all times;
This safety plug prevents the hook lever from rotating upward,
In addition, this hook lever prevents the lock lever from rotating in the direction of collapse, and thereby prevents the activation lever from being pushed down, so even if the activation lever remains attached to the reduction blade, the safety stopper can be opened easily and easily. It can be pulled upwards, improving operability in the event of a fire, and does not interfere with fire extinguishing operations.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing the structure of the main parts of a fire extinguisher equipped with the safety device of the present invention, Fig. 2 is an exploded perspective view of the safety device of the present invention, and Fig. 3 is an enlarged sectional view of the main parts. FIG. 4 is an explanatory diagram of the acting forces of the main parts. 1...Fire extinguisher body, 11...Bundle, 12...Start lever 13...Tsuku lever 14...Hook lever, 15...・・・
・Safety plug.

Claims (1)

[Scope of utility model registration request] A fire extinguisher in which a starting lever is pivotally attached to a handle fixed to the upper part of the fire extinguisher body so that it can be rotated in the vertical direction, and extinguishing agent can be spouted by pressing down on the starting lever. A lock lever is pivotally attached to the handle and has a cam surface with its upper end in contact with the lower surface of the activation lever to receive the rotational force for lodging from the lowering blade of the activation lever.The lock lever is arranged between the handle and the activation lever so that it can be rotated to stand up and fall down. death,
It has a locking pawl at the tip that locks onto the upper end of the lock lever in the upright state to prevent it from falling and turning, and also rotates upward with the turning force of the lock lever in the direction of fall to release the locking of the lock lever. The hook lever is pivotally attached to the lower surface of the activation lever so that it can rotate in the vertical direction, a vertical plug hole is provided at the upper end of the lock lever, and the lock lever is attached to the activation lever and the hook lever.
When standing up, provide a vertical plug hole that matches the above plug hole,
At all times, a safety plug that can be pulled upward is inserted into the three plug holes and the plug hole, and the safety plug prevents the hook lever from rotating upward, and the hook lever is used to prevent the lock lever from rotating upward. Prevents rotation in the direction of lodging, thereby
A safety device for a fire extinguisher, characterized in that it prevents the activation lever from being pushed down.