JPS5941467Y2 - ventilation fan - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a ventilation fan that has an improved structure to prevent a cover from falling off, which is detachably attached to the ventilation fan body.

For example, in a kitchen ventilation fan, a cover is removably attached to the main body using an engaging means so that the cover can be easily removed for cleaning, but the engagement is insufficient when the cover is attached. If the degree of engagement decreases due to changes over time, etc., there is a risk that the cover will fall off due to vibrations during operation, etc., so conventionally, a separate connector was installed to connect the cover to the main body. This prevents the cover from falling off even if the engagement is disengaged.

However, according to this conventional configuration, when attaching and detaching the cover, the connectors must be attached and detached one after another, which is cumbersome to operate, and the connectors are separate pieces, so there is a risk of them being lost. .

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a ventilation fan that can prevent the cover from falling off without using a separate connector, and can facilitate the operation of attaching and detaching the cover.

An embodiment of the present invention will be described below based on the drawings.

First, in FIGS. 1 to 3, 1 is an outer frame made of a steel plate that is fitted and fixed into a mounting opening 2 provided in a room wall, etc.
A motor 4 is disposed and fixed inside thereof via a mounting frame 3, and a ventilation fan 5 is directly connected to the motor 4, thereby forming a ventilation fan main body 6.

Reference numeral 7 denotes three shutters that are pivotally installed at the outdoor opening of the outer frame 1 so as to be rotatable to open and close. It is rotatably connected to a rod 8 that changes downward and upward, and when the switch is turned on and the rod 8 moves downward, it opens in conjunction with this, and when the switch is turned off and the rod 8 moves upward, it opens. It is designed to close in conjunction with the

Reference numeral 9 denotes four flanges formed by bending outward at a substantially right angle to the periphery of the indoor opening of the outer frame 1. Among these flanges 9, the top and bottom flanges on both sides have protrusions 10a at their tips. The engaging piece 10 is bent at a substantially right angle toward the interior of the room.

Reference numeral 11 denotes a cover integrally formed with the bell mouth 12 with a plastic bottom shape, and engaging protrusions 13 corresponding to the engaging pieces 10 of the outer frame 1 are integrally provided on both upper and lower sides of the distal end thereof.

The engagement protrusion 13 constitutes an engagement means together with the engagement piece 10. When the cover 11 is press-fitted to fit into the flange 9 of the outer frame 1, the engagement protrusion 13 is inserted into the engagement piece 10. Projection part 1
By elastically engaging the cover 11 with the outer frame 1
It is removably attached to the

When the cover 11 is attached, the bell mouth 12 is inserted into the outer frame 1 and surrounds the blower fan 5.

Now, the bell mouth 12 is formed into a substantially cylindrical shape with a diameter gradually decreasing from the indoor side to the outdoor side, and a flat protrusion is provided at the lowest part of the open end on the outdoor side. A shaped support protrusion 14 is integrally provided to protrude substantially horizontally toward the outdoor side, and a locking pawl 1 is provided at the tip of the support protrusion 14.
4a integrally protrudes upward.

On the other hand, the members of the six ventilation fan bodies, for example, the lower side 3 of the mounting frame 3
A vertically upward protruding piece 3b is bent and formed in the protruding piece 3b, and a locking hole 15 extending to the lower side 3a is formed in the protruding piece 3b.

When the cover 11 is attached to the outer frame 1, the support protrusion 14 is inserted through the locking hole 15 and the locking claw 1 at the tip is inserted into the locking hole 15.
4a is positioned behind the protruding piece 3b.

The locking pawl 14a of the support protrusion 14 is located slightly below the upper edge of the locking hole 15, and when passing through the locking hole 15 during the attachment/detachment operation of the cover 11, it is caught on the upper edge of the locking hole 15. This is done to ensure that nothing happens.

Reference numeral 16 denotes two ribs serving as fulcrum protrusions that are integrally formed to protrude downward from the bottom of the bell mouth 12 in the indoor/outdoor direction from the bottom to the support protrusion 14 in parallel with each other. It extends in the operating direction, that is, the indoor-outdoor direction (front-back direction), and its lower end is formed in a stepped shape that approximately matches the lower wall 1a of the outer frame 1, facing the lower wall 1a with a slight gap, and the outer It is in such a state that it is almost in contact with the inner surface of the lower wall 1a of the frame 1.

Next, the operation of the above configuration will be explained.

When the cover 11 is pulled forward to remove it for cleaning etc., the engagement protrusion 13 will come off from the engagement piece 10.
The cover 11 can be removed from the outer frame 1.

After cleaning, etc., in order to attach the cover 11 to the outer frame 1, first attach the rear end portion of the rib 16 to the lower wall of the outer frame 1.
If you place the cover 11 on the front end of a and push it backwards,
The rib 16 slides on the lower wall 1a of the outer frame 1, and as a result of the sliding, the support protrusion 14 is guided to naturally enter into the locking hole 15, and the engagement protrusion 13 is guided into the engagement piece. 10 protrusions 1
This engagement piece 1 is guided to naturally elastically engage with 0a.
The cover 11 is attached to the outer frame 1 by the engagement of the engagement protrusion 13 with the engagement protrusion 13. When the cover 11 is attached or detached in this manner, the support protrusion 14 is at approximately the same height position as the locking hole 15. Therefore, since the locking hole 15 is simply inserted in the front-rear direction when the cover 11 is attached or detached, the ease of attachment and detachment of the cover 11 is impaired, unlike the conventional case in which a separate connector is provided. There isn't.

By the way, when attaching the cover 11, if the engagement is insufficient or the degree of engagement decreases due to aging, etc., the engagement of the cover 11 with the outer frame 1 may be caused by vibrations during operation, etc. In particular, the engagement between the upper engagement piece 10 and the engagement protrusion 13 may disengage.

Then, the rib 16 of the bell mouth 12 is inserted into the lower wall 1 of the outer frame 1.
a, and the entire cover 11 tilts in the direction of arrow A due to its own weight around point P of the contact portion.

This tilting of the cover 11 causes the support protrusion 14 to move into the locking hole 1.
5 to prevent further tilting of the cover 11, and the locking pawl 14a is locked to the upper edge of the locking hole 15 to prevent the support protrusion 14 from coming out of the locking hole 15. Since the cover 11 is prevented from being pulled out, the cover 11 is supported by the outer frame 1 via the support protrusions 14 (see the fourth attachment).

Therefore, even if the cover 11 is disengaged from the outer frame 1,
There is no risk that the cover 11 will fall off and fall onto the cooking device or the like.

In addition, when the lower engagement piece 10 and the engagement protrusion 13 are disengaged, there is no need to wait for the falling-off prevention function of the support protrusion 14 and the upper engagement piece 10 and the engagement protrusion 13 are disengaged. The engagement with the cover 13 prevents the cover 11 from falling off.

By the way, the size of the outer frame 1 is determined based on the size of the mounting opening 2 provided in the room wall, etc.
is set to a relatively smaller outer diameter based on the size of the outer frame 1.

On the other hand, in order to maximize the air blowing efficiency of the blower fan 5, it is better to make the diameter of the bell mouth 12 as close to the outer diameter as possible based on the size of the blower fan 5. This inevitably creates a relatively large gap between the bell mouth 12 and the outer frame 1.

Therefore, assuming that the locking tab 16 is not provided, when the cover 11 is disengaged from the outer frame 1, the cover 11 falls downward by the gap between the bell mouth 12 and the outer frame 1. This causes a serious problem in that the tilting movement of the cover 11 cannot be expected, and the effectiveness of preventing the cover 11 from falling off is impaired.

However, according to this embodiment, the bell mouth 12 is provided with a rib 16 protruding downward so that the lower end of the rib 16 is in approximate contact with the lower wall 1a of the outer frame 1, so that the cover 11 can be disengaged. In this case, the cover 11 immediately begins to tilt in the direction of the arrow A using the point P as a fulcrum, and therefore the support protrusion 14 reliably contacts the upper edge of the locking hole 15, effectively preventing the cover 11 from falling off. do.

Note that the fulcrum protrusion is not limited to the rib 16 as in the above embodiment, but may also be a bar-shaped protrusion, in short, the cover 1
Any material may be used as long as it substantially contacts the lower wall 1a of the outer frame 1 in the attached state of 1 and can serve as a tilting fulcrum for the cover 11 when the cover 11 is disengaged.

Further, the fulcrum protrusion may be in contact with the lower wall of the outer frame when the cover is attached.

As explained above, in the present invention, when the cover naturally disengages from the outer frame, the cover tilts using the fulcrum protrusion as a fulcrum, so that the support protrusion aligns with the edge of the locking hole. In addition to abutting to prevent further tilting of the cover,
Since the locking pawl locks on the edge of the locking hole and prevents the support protrusion from being pulled out from the locking hole, it is possible to reliably prevent the cover from falling off, and moreover, when the cover is attached or removed. In , the support protrusion is simply inserted through the locking hole, so
It is possible to provide a ventilation fan which has an excellent effect of improving operability without requiring any special operation to prevent the cover from falling off, unlike the conventional method which uses a separate connector. .

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is an overall longitudinal sectional view, Fig. 2 is an enlarged longitudinal sectional view of the main parts, Fig. 3 is an enlarged exploded perspective view of the main parts, and Fig. 4 is an operational view. FIG. 2 is a longitudinal cross-sectional view of the entire structure for explanation. In the figure, 1 is an outer frame, 3 is a mounting frame, 4 is a motor, 5 is a blower fan, 6 is a ventilation fan body, 10 is a retaining piece (engaging means), 1
1 is a cover, 12 is a bell mouth, 13 is an engagement protrusion (engagement means), 14 is a support protrusion, 15 is a locking hole, and 16 is a rib (
fulcrum protrusion).

Claims (1)

[Scope of utility model registration request] 1. A ventilation fan body comprising a motor and a blower fan driven by the motor disposed within an outer frame, and a bell mouth inserted into the outer frame and surrounding the blower fan are integrated, and means for engaging the outer frame. a cover removably attached to the
A support protrusion protruding from the bell mouth and having a locking claw at the tip; and a support protrusion formed on a member on the ventilation fan main body side corresponding to the support protrusion, through which the support protrusion is inserted when the cover is attached or removed. and a fulcrum protrusion provided at a lower portion of the bell mouth to protrude downward and whose lower end substantially contacts the lower wall of the outer frame, and when the cover is disengaged, When the cover tilts using the lower end of the fulcrum protrusion that abuts the lower wall of the outer frame as a fulcrum, the support protrusion abuts the edge of the locking hole to prevent further tilting of the cover. In addition, in the ventilation fan, the locking pawl is locked to the edge of the locking hole to prevent the support protrusion from being pulled out from the locking hole. 2. The scope of the utility model registration claim, characterized in that the fulcrum protrusion has a rib shape extending in the direction of attaching and detaching the cover, and slides on the lower wall of the outer frame to perform a guiding action when the cover is attached. The ventilation fan described in paragraph 1.