JPH06129399A - Blower fan mounting device - Google Patents

Abstract

PURPOSE:To strengthen the spring force of a spring wire, i.e., the detention force, without thickening the spring wire. CONSTITUTION:A pair of spring wires 15, 15 of a detent member 13 are detained with a detaining groove 12 by their spring forces in the direction of shrinking, and a blower fan is mounted on a rotary shaft 8 in the slipoff prevented condition. The detent member 13 is moved toward the tips of the spring wires 15, 15, and their free ends 15b, 15b at the foremost are slided on the tapered surfaces 19a, 19a of the spreading part 19 and are spread, and thereby the wires 15, 15 are set off from the detaining groove 12. The free ends 15b, 15b are coupled by a coupling part 16 made in an upright form from a spring material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention attaches a blower fan to a rotary shaft in a retaining state by engaging a pair of spring wire portions of an engaging member provided on the blower fan with an engaging groove formed in the rotary shaft. The present invention relates to a blower fan mounting device having a structure, and more particularly, to a blower fan that can be more reliably prevented from coming off.

[0002]

2. Description of the Related Art For example, in a ventilation fan, as a device for facilitating the attachment / detachment operation of a blower fan, it is disclosed in Japanese Utility Model No.
There is a blower fan attachment device described in Japanese Patent Laid-Open No. 15. This is a taper for forming an engaging groove on the outer peripheral portion of the rotating shaft, and for expanding the fan-shaped engaging member having a pair of opposing spring wire portions and the pair of spring wire portions on the blower fan. -Shaped expanding portion is provided, the spring wire portion is engaged with the engaging groove by the spring force in the contracting direction, and the blower fan is attached to the rotation shaft so as not to come off. When the moving operation is performed, both end portions of the spring wire portion slide on the tapered surface of the expanding portion to expand, and are disengaged from the engaging groove.

[0003]

By the way, in the mounting device having the above-mentioned structure, since both ends of the spring wire portion are open, the spring force is weak, and when a force in the removal direction acts on the blower fan, The spring wire portion may come off from the engagement groove.

In order to solve this problem, the spring wire portion may be thickened to increase the spring force. However, if this is done, the manufacturability is deteriorated and the cost is increased.

The present invention has been made in view of the above circumstances, and an object thereof is to enhance the spring force of the spring wire portion, that is, the engaging force without increasing the thickness of the spring wire portion. It is an object of the present invention to provide a blower fan attachment device that can more reliably prevent the spring wire portion from coming off the engagement groove without lowering manufacturability and increasing costs.

[0006]

According to a first aspect of the present invention, there is provided a blower fan mounting device in which an engaging groove is formed in an outer peripheral portion of a rotary shaft, and the blower fan has a pair of spring wire portions facing each other. A bifurcated engagement member and a tapered expansion portion for expanding the pair of spring wire portions are provided, and the pair of spring wire portions are engaged with the engagement groove by the spring force in the reduction direction. Attach the blower fan to the rotating shaft so that it does not
The engaging member is moved in the direction of the tip of the spring wire portion to slide both end portions of the spring wire portion on the tapered surface of the expanding portion to open the spring, and thereby the spring from the engaging groove. A feature of the structure in which the wire portion is removed is that the both end portions of the spring wire portion are connected by a standing-shaped connecting portion made of a spring material.

According to a second aspect of the present invention, there is provided a blower fan mounting device, wherein the engaging member includes an operating member for moving operation at a base end portion of the spring wire portion, and the base end portion of the spring wire portion of the engaging member is provided. It is characterized in that it is attached to the operating member in a state of being separated and each of the separating ends thereof being contracted against the expanding force.

According to another aspect of the blower fan mounting device of the present invention, the blower fan has a bifurcated engaging member having an engaging groove formed on the outer peripheral portion of the rotary shaft and having a pair of spring wire portions facing each other on the blowing fan. And a tapered expanding portion for expanding the pair of spring wire portions, and the pair of spring wire portions are engaged with the engaging groove by the spring force in the contracting direction to rotate the blower fan. By attaching the engaging member to the shaft in a retaining state and moving the engaging member in the direction of the tip of the spring wire portion so that both tip portions of the spring wire portion slide on the tapered surface of the expanding portion to expand. In the configuration in which the spring wire portion is removed from the engagement groove, standing portions are formed at both the tip end portions of the spring wire portion, and the standing portion is formed substantially at the center of the expanding portion. Form a pair of rising parts that rise in the same direction and expand the both rising parts. Having the features of at where the structure was inserted between each of the tapered surface and both upstream portion.

According to another aspect of the blower fan mounting device of the present invention, the portion of the spring wire portion that engages with the engagement groove is angled so that the inner edge contacts the retaining engagement surface portion of the engagement groove. The feature is that a flat surface is formed.

[0010]

In the blower fan mounting device according to the first aspect of the present invention, both ends of the pair of spring wire portions of the engaging member are connected by the connecting portion made of the spring material. The spring force of is strengthened. As a result, the engaging force of the spring wire portion with respect to the engaging groove can be strengthened, and the spring wire portion can be more reliably prevented from coming off the engaging groove. Further, since the spring force can be strengthened by the above-mentioned connecting portion, it is not necessary to increase the thickness of the spring wire portion. Further, since the connecting portion has the upright shape, when the spring wire portion is moved and operated in the distal end direction, the connecting portion does not abut against the expanding portion and stop, thus hindering the movement and the expansion. There is no such thing. At the time of this expansion, the two ends of the spring wire portion are expanded in an arc shape around the middle portion of the connecting portion, so that the spring wire portion is twisted.

In the blower fan mounting device of the second aspect, the base end portion of the spring wire portion is separated and each separated end portion is mounted on the operating member in a state of being contracted against the expanding force. Therefore, the spring wire portion is reliably attached to the operating member.

In the blower fan mounting device of the third aspect, the upright portions respectively formed at both ends of the pair of spring wire portions of the engaging member are inserted between the tapered surface of the expanding portion and the ascending portion. Therefore, the movement of the rising portion of the spring wire portion in the expanding direction is controlled by the ascending portion, and the spring force in the contracting direction is strengthened. As a result, the engaging force of the spring wire portion with respect to the engaging groove can be strengthened, and the spring wire portion can be more reliably prevented from coming off the engaging groove. And, since the spring force can be strengthened by the above-mentioned rising portion and rising portion,
It is not necessary to increase the thickness of the spring wire section. Also, the standing part is
Since this itself is standing up, when the spring wire part is moved and operated, both standing parts do not stop by hitting the expanding part, and the standing part prevents the movement and thus the expanding. There is no such thing. At the time of this expansion, since the movement of the upright portion in the expansion direction is restricted and each free end portion expands,
The spring wire portion is twisted.

According to a fourth aspect of the present invention, a flat surface is formed at a portion of the spring wire portion that engages with the engaging groove so that an inner edge of the engaging surface is in contact with the retaining engagement surface portion of the engaging groove. Therefore, when an external force acts on the blower fan in the direction of coming out of the rotating shaft, the inner edge of the flat surface formed on the spring wire portion hits the retaining engagement surface portion of the engaging groove and bites into the state. The removal of the blower fan can be prevented more reliably.

Further, when the engaging member is moved to open both end portions of the spring wire portion in order to remove the blower fan from the rotary shaft, the spring wire portion is expanded while being twisted as described above. By doing so, the above-mentioned bite of the inner edge of the flat surface is released. This allows the blower fan to be removed more easily.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. 1 to 10 by applying the present invention to a ventilation fan attachment device.

In FIG. 10 showing a schematic structure of the ventilation fan,
Reference numeral 1 is an outer frame, 2 is a motor disposed in the outer frame 1, and a blower fan 3 is detachably attached to the motor 2. As is well known, when the blower fan 3 is rotated by the motor 2, the air inside the room is discharged to the outside. A bell mouth 4 is attached to the indoor side of the outer frame 1, and a wind pressure release type shutter 5 is attached to the outdoor side.

As shown in FIG. 2 and FIG. 3, the blower fan 3 is constructed by radially projecting blade pieces 7 on an outer peripheral portion of a cylindrical blade base portion 6, and a central portion of the blade base portion 6. A stepped cylindrical boss portion 9 having a fitting hole 9a to be fitted into the rotary shaft 8 of the motor 2 is provided on the projecting side. A recess 10 is formed on the tip surface of the boss portion 9. When the blower fan 4 is attached to the rotary shaft 8, the recess 10 engages with both ends of the pin 11 fixed to the rotary shaft 8. It is configured. Then, the engagement between the recess 10 and the pin 11 allows the rotation transmission from the rotary shaft 8 to the blower fan 3.

Now, the mounting structure of the blower fan 3 will be described with reference to FIGS. 1 to 3. First, the rotating shaft 8 of the motor 2 will be described.
The tip end side portion is formed in a tapered taper portion 8a, and an annular engaging groove 12 is formed around the outer peripheral portion in the vicinity of the taper portion 8a. On the other hand, in the blade base portion 6 of the blower fan 3, an engagement member 13 for engaging with the engagement groove 12 and for preventing the blower fan 3 from coming off is disposed.

The engagement member 13 is provided with a plastic push button 14 as an operating member, and a pair of spring wire portions 15 and 15 are attached to the push button 14 so as to face each other. As shown in FIGS. 1 and 8, the pair of spring wire portions 15 and 15 are formed by bending one spring material having a circular cross section, and the base end portion 15 a of the pair of spring wire portions 15 and 15 is fitted into the fitting groove portion 1 of the push button 14.
4a is inserted and mounted.

Spring wire portions 15, 15 of the engaging member 13
Both tip portions 15b, 15b are free ends that can be expanded, and thus the engaging member 13 is bifurcated as a whole. Then, both ends 1 of the spring wire portion 15
5b and 15b are integrally connected by a standing-shaped connecting portion 16. The spring material is spot-welded at the P portion of the connecting portion 16, as shown in FIG.

The push button 14 of the engaging member 13 is projected to the outside from the hole 17 formed in the blade base portion 6, and when the push button 14 is pressed, the engaging member 13 is moved to the position shown in FIGS. It can be moved in the direction indicated by arrow A. In addition, the pair of spring wire portions 15, 1
The reference numeral 5 is inserted through holding holes 18, 18 formed in the peripheral wall of the boss portion 9, and can be displaced in the expansion / contraction direction within the holding holes 18, 18. Then, the spring wire portion 15,
Reference numeral 15 has a spring force in the reduction direction indicated by arrows Ba and Bb in FIGS. 1 and 3, and the engagement groove 12 is caused by the spring force.
Engage with.

The engaging member 13 is arranged in the blade base 6 by being inserted through the hole 17, and the retaining member 13 is secured to the blade base 6 by the elastic claw piece 14b formed integrally with the push button 14. It is made by elastically engaging with a locking portion 6a protruding from the inner peripheral portion.

On the inner side of the blade base portion 6, a widening portion 19 is provided so as to project on the opposite side of the hole 17. The expanded portion 19 has a tapered shape, and has tapered surfaces 19a on both sides,
The front end portions 15b, 15b of the pair of spring wire portions 15, 15 of the engaging member 13 are in sliding contact with 19a. And push button 1
When the engaging member 13 is moved and operated in the direction of arrow A by the pressing of 4, the tip ends 15b, 15 of the spring wire portions 15, 15 are moved.
b slides on the tapered surfaces 19a, 19a from the narrow side to the wide side of the expanding portion 19, so that the pair of spring members 15, 15 gradually move from both ends 15b, 15b to the arrow Ba, Engagement groove 1 is expanded in the direction opposite to Bb.
It is configured to deviate from 2.

Further, in the spring wire portions 15 and 15, flat surfaces 20 and 20 are formed at the portions which are engaged with the engagement grooves 12 to prevent the blower fan 3 from coming off. This flat surface 2
As shown in FIG. 4, 0 and 20 are angled so that the inner edges 20a and 20a abut against the retaining engagement surface portion 12a of the engagement groove 12.

Next, the operation of attaching and detaching the blower fan 3 to and from the rotary shaft 8 in the above-mentioned structure will be described.

First, in order to attach the blower fan 3 to the rotary shaft 8, hold the blade base portion 6 in the hand and fit it into the fitting hole 9a of the boss portion 9.
Is fitted to the rotary shaft 8 and pushed in. Then, the tapered taper portion 8 a of the rotating shaft 8 is connected to the pair of spring wire portions 1 of the engaging member 13.
The pair of spring wire portions 15, 15 spreads out relatively to the center of the tapered portion 8a and rides on the outer peripheral surface of the tapered portion 8a. Then, the concave portion 10 on the tip surface of the boss portion 9
Is aligned with both ends of the pin 11 of the rotary shaft 8, the spring wire portions 15, 15 are relatively fitted and engaged in the engaging groove 12 by the spring force in the contracting direction. In this case, the inner edges 20a, 20a of the flat surfaces 20, 20 have the retaining engagement surface portion 12a in the engagement groove 12 as shown in FIG.
The inner edges 20a, 20a hit the first edge so as to bite.

In this case, the tip ends 15b, 15b of the pair of spring wire portions 15, 15 of the engaging member 13 are connected by the connecting portion 16 made of a spring material.
The spring force of 5, 5 in the contracting direction is strengthened, and as a result, the engagement force of the spring wire portions 15, 15 with respect to the engagement groove 12 is strengthened. Therefore, the spring wire portions 15, 15 will not be disengaged from the engagement groove 12.

Next, when removing the blower fan 3 from the rotary shaft 8, the push button 14 is pushed in the direction of arrow A in FIG.
Then, both tip portions 15b, 15b of the spring wire portions 15, 15 are
On the tapered surfaces 19a, 19a of the expanding portion 19
By sliding from the narrow side of 9 to the wide side,
The pair of spring members 15 and 15 are gradually expanded in the direction opposite to the arrow B from both the end portions 15b and 15b (see FIGS. 5 and 6). As a result, the spring members 15 and 15 are disengaged from the engagement groove 12.

At the time of this pushing operation, since the connecting portion 16 is formed in the upright shape, the connecting portion 16 is formed into the expanding portion 19.
It does not come into contact with and does not hinder the expansion. At the time of this expansion, the spring wire portions 15, 15 expand in an arc shape around the intermediate portion of the connecting portion 16 as shown by the chain double-dashed line in FIG. , 15
The flat surfaces 20 and 20 incline so as to release the above-mentioned bite from the engaging groove 12 by expanding while being twisted (see FIG. 7). This allows the blower fan 3 to be removed more easily.

According to this embodiment as described above, the engaging member 1
Tip ends 15b and 15 of the pair of spring wire portions 15 and 15
Since b is connected by the connecting portion 16 made of a spring material, the spring force of the spring wire portions 15, 15 in the contracting direction can be strengthened and the engaging force of the spring wire portions 15, 15 with respect to the engaging groove 12 can be increased. Can be strengthened. As a result, it is possible to more reliably prevent the spring wire portions 15, 15 from coming off the engagement groove 12.

Further, according to this embodiment, the above-mentioned connecting portion 1
Since the spring force can be strengthened by 6, it is not necessary to increase the thickness of the spring wire portions 15 and 15, and it is possible to prevent a decrease in manufacturability and an increase in cost. Further, since the connecting portion 16 has an upright shape, when the spring wire portions 15, 15 are moved and operated, the connecting portion 16 does not abut against the expanding portion 19 and stop, so that the moving and expanding operation is not performed. It does not prevent opening.

Moreover, according to the present embodiment, the spring wire portion 1
5 and 15, the flat surfaces 20 and 20 are formed at the portions to be engaged with the engagement groove 12 so that the inner edges 20a and 20a come into contact with the retaining engagement surface portion 12a of the engagement groove 12. Therefore, even if an external force acts on the blower fan 3 in the direction of coming out of the rotating shaft 8, the spring wire portions 15, 1
Inner edges 20a of the flat surfaces 20, 20 formed in
By the state where 20a hits the retaining engagement surface portion 12a of the engagement groove 12 and bites into it, the blower fan 3 can be more reliably prevented from being removed.

As described above, in the engaging member 13 of this embodiment, since the spring wire portions 15 and 15 are expanded while being twisted, the flat surface 20 bites into the engaging groove 12. Tilt so that is released. With this, blower fan 3
Can be removed more easily.

In the above embodiment, the connecting portion 16 is connected to the spring wire portion 1.
Although the spring material is integrated with the springs 5 and 15, it may be configured as shown in FIG. 11 showing the second embodiment of the present invention and FIG. 12 showing the third embodiment of the present invention. That is, in FIG. 11, the upright connecting portion 2 made of a leaf spring material is used.
1 is connected to the spring wire portions 15 and 15 by spot welding. In FIG. 12, an upright-shaped connecting portion 31 made of a linear spring material having a torsion coil portion 31a is connected to the spring wire portions 15 and 15 by spot welding. In each of these embodiments, the same effect as that of the first embodiment can be obtained.

13 and 14 show a fourth embodiment of the present invention. In this embodiment, the push button 41 is configured to have a concave mounting hole 41a,
The base end portions of the spring wire portions 15, 15 are separated, and the respective separated end portions 15c, 15c are inserted into the mounting hole 41a of the push button 41 and mounted in a state of being contracted against the expanding force. There is.

According to this embodiment, the spring wire portions 15, 15
Exerts an expanding force on the mounting hole 41a of the push button 41, so that the spring wire portions 15 and 15 can be mounted more reliably than in a configuration in which the spring wire portion is simply inserted into the fitting groove portion of the push button. it can. In addition, since the base end portions of the spring wire portions 15 and 15 are separated from each other, the spring wire portions 15 and 15 can be formed without performing the welding and joining at the connecting portion 16, thus improving manufacturability. Can be achieved.

Next, a fifth embodiment of the present invention will be described with reference to FIG.
5 to 20, parts different from those of the first embodiment will be described. Spring wire portions 15, 15 of the engaging member 13
In both the tip portions 15b, 15b, a straight standing portion 51,
51 is formed. Further, the blade base portion 6 of the blower fan 3 is located at the central portion of the expanding portion 19 and has the rising portion 5
A pair of rising portions 52, 5 rising in the same direction as 1, 51
2 is formed. The standing portions 51, 51 are inserted between the expanding portion 19 and the rising portions 52, 52, respectively.

In the fifth embodiment, the blower fan 3
When the blade base 6 is fitted into the rotary shaft 8 and is pushed in to attach the blade base 6 to the rotary shaft 8, the central portions of the pair of spring wire portions 15 and 15 are expanded to ride on the outer peripheral surface of the taper portion 8a.
Then, when the recess 10 on the tip end surface of the boss portion 9 is matched with both ends of the pin 11 of the rotary shaft 8, the spring wire portions 15, 15 are relatively moved by the spring force in the reducing direction at that time. The engagement groove 12 is fitted and engaged.

In this case, as in the first embodiment, the inner edges 20a, 20a of the flat surfaces 20, 20 are located inside the retaining engagement surface portion 12a of the engagement groove 12 as shown in FIG. The edges 20a, 20a hit so as to bite.

Further, in this case, the movement of the rising portions 51, 51 of the spring wire portions 15, 15 in the expanding direction is compatible with the rising portions 52, 5.
Since it is regulated by 2, the spring force in the contracting direction is strengthened. As a result, the engagement force of the spring wire portions 15, 15 can be strengthened, and the spring wire portions 15, 15 can be more reliably prevented from coming off the engagement groove 12.

On the other hand, when removing the blower fan 3 from the rotary shaft 8, the push button 14 is pushed in the direction of arrow A in FIG. Then, both tip portions 15b, 1 of the spring wire portions 15, 15 are
5b slides on the tapered surfaces 19a, 19a of the expanding portion 19 from the narrow side of the expanding portion 19 toward the wide side thereof, so that the pair of spring members 15, 15 have their distal end portions 15b, 15b.
From the 15b side, it gradually expands in the direction opposite to the arrows Ba and Bb. As a result, the spring members 15 and 15 are engaged with the engaging groove 12
Get out of.

At this time, since the upright portions 51, 51 have such a shape that they stand upright, when the spring wire portions 15, 15 are operated to move, the upright portions 51, 51 abut the expanding portion 19. It does not stop and does not hinder the above movement or extension. At the time of this expansion, since the movement of the upright portions 51, 51 in the expansion direction is restricted and both the tip portions 15b, 15b are expanded, the spring wire portions 15, 15 as shown in FIG. Is twisted, whereby the flat surfaces 20, 20 are inclined with respect to the engagement groove 12 so as to release the bite. This allows the blower fan 3 to be removed more easily.

According to the fifth embodiment, the rising portions 5 and 51 formed on the both ends 15b and 15b of the spring wire portions 15 and 15 can move in the expanding direction at the same time.
Since it is regulated by 2, 52, the spring force in the contracting direction can be strengthened, and as a result, the spring wire portion 15,
The engaging force of 15 can be strengthened, and the spring wire portions 15, 15 can be more reliably prevented from coming off the engaging groove. Moreover, it is not necessary to increase the thickness of the spring wire portions 15 and 15, and it is possible to prevent a decrease in manufacturability and an increase in cost. In addition, in the fifth embodiment, the same effect as that of the first embodiment can be obtained in other points.

The present invention is not limited to the above-described embodiments, but can be implemented with various modifications without departing from the scope of the invention.

[0045]

As is apparent from the above description, the present invention can obtain the following effects.

According to the blower fan mounting device of claim 1,
Since both ends of the pair of spring wire portions of the engaging member are connected by the connecting portion made of the spring material, the spring force of the spring wire portion in the contracting direction can be strengthened, and the spring wire portion can be engaged. Detachment from the mating groove can be prevented more reliably, and this can be achieved without increasing the thickness of the spring wire portion, which can prevent lowering of manufacturability and high cost.

According to the blower fan mounting device of claim 2,
Since the base end portion of the spring wire portion is separated and each of the separated end portions is attached to the operation member in a state of being contracted against the expanding force, the attachment of the spring wire portion to the operation member is ensured. In addition, the manufacturability of the spring wire portion can be improved.

According to the blower fan mounting device of claim 3,
Standing portions are formed at both ends of the spring wire portion, and
A configuration in which a pair of rising portions that rise in substantially the same direction as the rising portion are formed at the center of the expanding portion, and both rising portions are inserted between the tapered surface of the expanding portion and the compatible rising portion. Therefore, the spring force of the spring wire portion in the contracting direction can be strengthened, and the spring wire portion can be more reliably prevented from coming off the engagement groove, and moreover, the thickness of the spring wire portion can be increased. Can be achieved without
It is possible to prevent a decrease in manufacturability and a high cost.

According to the fourth aspect, a flat surface angled so that the inner edge abuts the retaining engagement surface portion of the engagement groove at a portion of the spring wire portion that engages with the engagement groove. Since it is configured to be formed, the inner edge of the flat surface can be engaged so as to bite into the retaining surface of the engagement groove, and the blower fan can be reliably held in the mounted state.
Further, when the blower fan is detached, the bite state can be favorably released due to the spring wire portion expanding while being twisted, and the blower fan can be removed more easily.

[Brief description of drawings]

FIG. 1 is a perspective view of essential parts showing a first embodiment of the present invention.

FIG. 2 is a vertical sectional side view of a blade base portion.

FIG. 3 is a rear view seen from the direction of arrow K in FIG.

FIG. 4 is a cross-sectional plan view showing an engagement state between an engagement groove and a spring wire portion.

FIG. 5 is a perspective view of a main part for explaining removal of the blower fan.

FIG. 6 is a view corresponding to FIG. 3 for explaining the removal of the blower fan.

FIG. 7 is a cross-sectional plan view showing a disengaged state between the engagement groove and the spring wire portion.

FIG. 8 is a perspective view of a spring wire portion.

FIG. 9 is a sectional view for explaining a twisting action of a spring wire portion.

FIG. 10 is a vertical side view of the ventilation fan.

FIG. 11 is a view corresponding to FIG. 8 showing a second embodiment of the present invention.

FIG. 12 is a view corresponding to FIG. 8 showing a third embodiment of the present invention.

FIG. 13 is a perspective view of an engaging member showing a fourth embodiment of the present invention.

FIG. 14 is an exploded perspective view of an engagement member.

FIG. 15 is a view corresponding to FIG. 1 showing a fifth embodiment of the present invention.

FIG. 16 is a view corresponding to FIG.

FIG. 17 is a view corresponding to FIG.

FIG. 18 is a view corresponding to FIG.

FIG. 19 is a view corresponding to FIG.

FIG. 20 is a view equivalent to FIG. 7.

[Explanation of symbols]

3 is a blower fan, 6 is a blade base, 8 is a rotating shaft, 10 is a recess, 11 is a pin, 12 is an engaging groove, 13 is an engaging member, and 14 is an engaging member.
Is a push button (operating member), 15 is a spring wire portion, 15a is a base end portion, 15b is a tip end portion, 16 is a connecting portion, 19 is an expanding portion, 1
9a is a tapered surface, 20 is a flat surface, 20a is an inner edge, 21 is a connecting portion, 31 is a connecting portion, 41 is a push button (operating member), 51 is a standing portion, and 52 is a rising portion.

Claims (4)

[Claims] 1. A bifurcated engagement member having a pair of spring wire portions facing each other and an expansion groove formed in an outer peripheral portion of a rotary shaft and having a pair of spring wire portions facing each other in a blower fan. A tapered expanding portion for opening is provided, the pair of spring wire portions are engaged with the engaging groove by a spring force in the contracting direction, and the blower fan is attached to the rotary shaft in a retaining state,
The engaging member is moved in the direction of the tip of the spring wire portion to slide both end portions of the spring wire portion on the tapered surface of the expanding portion to open the spring, and thereby the spring from the engaging groove. A blower fan mounting device characterized in that the wire portion is removed, and the both ends of the spring wire portion are connected by an upright connecting portion made of a spring material. 2. The engagement member includes an operation member for moving operation at a base end portion of the spring wire portion, and the spring wire portion of the engagement member has its base end portion separated and each of the separated ends thereof. The blower fan attachment device according to claim 1, wherein the portion is attached to the operation member in a state in which the portion is contracted against the expanding force. 3. A bifurcated engagement member having a pair of spring wire portions facing each other and an expansion groove formed in an outer peripheral portion of a rotating shaft and having a pair of spring wire portions facing each other in a blower fan. A tapered expanding portion for opening is provided, the pair of spring wire portions are engaged with the engaging groove by a spring force in the contracting direction, and the blower fan is attached to the rotary shaft in a retaining state,
The engaging member is moved in the direction of the tip of the spring wire portion to slide both end portions of the spring wire portion on the tapered surface of the expanding portion to open the spring, and thereby the spring from the engaging groove. In the one in which the wire portion is removed, a pair of rising portions is formed at each of the distal end portions of the spring wire portion, and rises in the center of the expanding portion in substantially the same direction as the rising portion. A blower fan mounting device, characterized in that a portion is formed, and both the upright portions are inserted between the tapered surface of the expanded portion and the ascending upward portion. 4. A flat surface is formed at a portion of the spring wire portion that engages with the engagement groove so that the inside edge of the engagement groove contacts the retaining engagement surface portion of the engagement groove. The blower fan mounting device according to claim 1 or 3, characterized in that.