JPS5912717Y2 - Smoke detector case structure - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a case structure of a smoke detector.

Smoke detectors may cause false alarms due to dirt, debris, etc. due to long-term installation.

To prevent this, it is necessary to clean the inside and it must be possible to divide it.

For this reason, the case of a smoke detector can be divided into a base and a cover, and conventional methods for attaching the base and cover without using screws or tools include the following: Ta.

That is, push the three engagement protrusions on the smoke detector cover into the engagement grooves on the base of the smoke detector, press and turn to attach the cover to the base, assemble the case, and attach the cover and base. To remove it, push it in the opposite direction and turn it in the opposite direction to separate it.

However, this case itself is attached to a base that is fixed under the ceiling by pushing it around, and is removed by pushing it in the opposite direction, so the same force is applied when removing the smoke detector from the base. There was a drawback that when removing the smoke detector from the base, the cover and base of the smoke detector itself also came off.

The present invention was developed in view of the drawbacks of the conventional slanted structure, and its purpose is to push and turn the smoke detector case from the base using a locking mechanism consisting of a locking protrusion and a locking lever protrusion. A case structure for a smoke detector such as a rechargeable type or a light scattering type that prevents the cover and base of the case from disassembling even when the case is removed, and also allows the cover and base to be easily attached and detached. is to provide.

In the present invention, a locking protrusion 3 that is inclined with respect to the inner circumferential direction of the cover 1 is provided at the upper end of the inner periphery of the cover 1, which has an open upper surface that serves as a mounting surface for the base 5. An operating opening 7 is bored in the periphery of the base 6 fitted in the opening,
The upper end of a locking lever 8 provided on the base 6 that can be elastically bent inward is positioned in the operation opening 7, and a protrusion 9 for preventing cover rotation is protruded from the outer surface of the locking lever 8. A case of a smoke detector comprising turning the cover 1 to attach the cover 1 to the base 6 and locking the protrusion 9 of the locking lever 8 to the stepped protrusion 4 on the inwardly protruding side of the locking protrusion 3. This is related to the structure, and through this, the above objective could be achieved.

The present invention will be explained in detail below with reference to the accompanying drawings.

As shown in Fig. 1, the case 10 of a photoelectric type, light scattering type, etc. smoke detector has a base 6 and a cover 1, and the base 6 is rotated to achieve dimensional accuracy in the vertical direction. It is attached to the upper opening of the cover 1 by a locking method, and a light shielding tube 11 is attached to the lower part of the cover 1.

In other words, the top surface of the substantially dish-shaped cover 1 is open, the top end of the cover 1 is provided with three engaging protrusions, and the circumference of the base 6 is provided with three retaining grooves. The cover 1 is fixed to the base 6 by inserting each engagement protrusion into each engagement groove and positioning the cover 1, for example, in a clockwise direction.

For example, the upper end of the engagement protrusion provided at the upper end of the cover 1 is enlarged to form a bulge, and a retaining groove with a lip is provided along the circumferential direction on the lower surface of the base 6. It is conceivable to insert the above-mentioned bulge into the fitting groove through an insertion opening in which the lip at one end of the locking groove is cut out, and then turn the cover 1 to hook the bulge of the locking protrusion and the lip of the locking groove. .

Further, a locking protrusion 3 that is inclined with respect to the inner circumferential direction of the cover 1 is provided on the upper end of the inner circumference of the cover 1 so that the inwardly protruding side of the locking protrusion 3 is a stepped protrusion 4, and the base 6 An operating opening 7 is bored in the periphery of the operating opening 7, and the inner upper end of the approximately U-shaped locking part 2 is fixed to the inner periphery of the operating opening 7, so that the outer half of the locking part 2 is used for locking. The locking lever 8 can be bent inward by the elasticity of the bent part 12 at the bottom of the locking part 2, and a protrusion 9 is provided on the outer surface of the locking lever 8. The upper end of the lever 8 is located in the operating opening 7.

However, as described above, when inserting the engaging protrusion into the engaging groove and turning the cover 1, the steps shown in FIGS. 4a and 4b are performed.

As shown in C, the locking lever 8 slides along the locking protrusion 3 while elastically deflecting inward, and when it passes the step protrusion 4, the protrusion 9 of the locking lever 8 engages with the step protrusion 4. to prevent the cover 1 from being reversed.

In this way, with the cover 1 and the base 6 locked, the base 6 side (the top surface of the case) is brought into contact with the base 5 fixed to the lower surface of the ceiling, etc., and the case 10 is rotated, for example, clockwise. It is to be fixed in place.

When the case 10 is attached to the base 5 in this way, the operating opening 7 of the base is covered and hidden by the base 5, and the locking lever 8 cannot be touched and the cover 1 is closed.
and the base 6 are designed to never come off.

Conversely, when removing the case 10 from the base 5 by holding the cover 1 and turning it counterclockwise, for example, the base 6 and the cover 1 are locked together, so the case 10 can be removed from the base 5 without disassembling it. be.

After this, to divide the case 10 into the cover 1 and the base 6, as shown in FIG. Rotate counterclockwise to unlock the locking protrusion 3.

In addition, 13 is a light emitting diode for operation confirmation, 14 is a plate spring receiver from the shield cover, and 15 is a positioning protrusion.

As described above, the present invention prevents the cover and the base from rotating in the direction of disassembly using the locking mechanism consisting of the locking protrusion and the protrusion of the locking lever. The cover and base of the case itself will not come apart.

In addition, this locking mechanism locks the cover and base by simply rotating them, and releases the lock by simply bending the locking lever and rotating the cover, allowing you to attach and detach the cover and base without using screws or tools. The effect is that it can be done.

Furthermore, since the locking lever and protrusion are provided on the top surface of the cover, which is the mounting surface that is attached to the base, and on the base fitted into the opening on the top surface of the cover, the locking lever and the protrusion are covered by the base. This has the advantage that dust, insects, etc. do not enter the cover from here, and there is no risk of accidentally disengaging the locking lever from the protrusion when removing the cover and base from the base. have.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention;
Figure 2 is a top view of the same cover as above, Figure 3 is an enlarged top view showing the locking protrusion of the same as above, and Figures 4a, b, and c are the locked states of the locking protrusion and the protrusion of the locking lever. FIG. 2 is an explanatory view of the action seen from the direction A in FIG. 1. DESCRIPTION OF SYMBOLS 1...Cover, 3...Lock protrusion, 4...Step protrusion, 5...Base, 6...Base, 7...Operation opening, 8...Lock Lever 9...Protrusion.

Claims (1)

[Scope of utility model registration request] A locking protrusion inclined with respect to the inner circumferential direction of the cover is provided at the upper end of the inner periphery of the cover, which has an opening on the upper surface that serves as the mounting surface to the base, and a locking protrusion that is inclined with respect to the inner circumferential direction of the cover is provided. An operating opening is drilled around the periphery, and the upper end of the locking lever provided on the base, which can be elastically bent inward, is positioned in the operating opening, and a cover is placed on the outer surface of the locking lever to prevent rotation. A smoke detector case structure in which a protrusion for a lock is protruded, a cover is turned to attach the cover to a base, and a protrusion of a locking lever is engaged with a step protrusion on an inwardly protruding side of a lock protrusion. .