JPH0341115Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention is a method of driving a ventilation fan by engaging a bifurcated spring member provided on the ventilation fan with an engagement groove formed on a drive shaft. The present invention relates to a blower fan mounting device that is configured to be installed in a non-removal state, and particularly to one that facilitates operation when removing the blower fan from a drive shaft.

(Prior Art) Conventionally, for example, in a ventilation fan, the configuration in which a blower fan is attached to a drive shaft is such that a male thread is formed at the tip of the rotary shaft of the motor, and a spinner nut is provided to be screwed into this male thread. The boss portion of the blower fan is inserted into the shaft, and then a spinner nut is screwed onto the male threaded portion of the drive shaft to tighten and fix the blower fan. However, with such a mounting configuration, the user must turn the spinner nut many times to tighten and remove it, which is a troublesome task for the user.

As a solution to this problem,
There is a blade attachment/detachment device described in Publication No. 95447.
This involves forming an engagement groove on the outer periphery of the drive shaft, attaching a bifurcated spring member to the fan to engage with the engagement groove, and inserting the boss of the fan into the drive shaft. The spring member is expanded by the tapered part at the tip of the drive shaft, and when the blower fan is further pushed in, the spring member contracts due to its own elastic force and engages so as to fit into the engagement groove of the drive shaft. It has a structure that prevents it from coming out.

(Problem to be solved by the invention) According to such a retaining structure, if the amount of fitting of the spring member into the engagement groove is small, the spring member will inadvertently come off from the engagement groove. There are circumstances in which it is necessary to increase the depth of the fitting groove to increase the amount of fitting of the spring member. Since the spring member does not expand with force, it is not possible to remove the blower fan, and in order for the spring member to expand due to tensile force and come out of the engagement groove, a considerable amount of force is required, making removal work difficult. The problem is that it becomes difficult.

The present invention has been developed in view of the above circumstances, and its purpose is to provide a blower fan installation that allows the bifurcated spring member to be easily removed from the engagement groove and that allows the blower fan to be easily removed from the drive shaft. We are in the process of providing equipment.

[Structure of the invention] (Means for solving the problem) The present invention provides a blower fan with a taper whose end portion is located between the two ends of a bifurcated spring member and which slides into contact with both ends of the spring member. An expanding member having a surface and an operating member to be pressed are provided, and one of the spring member and the expanding member is configured to be movable in conjunction with the pressing operation of the operating member, and ,
A feature is that when the operating member is pressed, the tip of the spring member slides relatively on the tapered surface of the expansion member to expand and disengage the spring member from the engagement groove. has.

(Example) Hereinafter, an example in which the present invention is applied to a ventilation fan will be described with reference to FIGS. 1 to 3. First, in Fig. 3 showing the schematic configuration of the ventilation fan, 1
is a rectangular outer frame, with openings on both the front and rear sides, and a shutter 2 attached to one opening on the outdoor side, which is closed at all times (when the operation is stopped). 3 is a motor, which is attached to a support member 4 fixed within the outer frame 1; 5 is a blower fan, which has blade pieces 7 projecting radially around the outer circumference of a cylindrical blade base 6; It is configured.
The blowing fan 5 is attached to a rotating shaft 8 (see FIG. 1) of the motor 3, which is a driving shaft, as will be described later. Incidentally, the shutter 2 is kept in an open state during operation when the motor 3 is started and the blower fan 5 is rotated so that the room can be ventilated.

Next, in FIGS. 1 and 2 showing the mounting configuration of the blower fan 5, a pin 9, which is a convex portion for transmitting rotation, is press-fitted into the rotating shaft 8 in the middle so as to pass through it in the radial direction. An annular engagement groove 10 is formed around the outer circumferential portion of the tapered portion 8a at the tip of the rotating shaft 8. On the other hand, a stepped cylindrical boss portion 11 is integrally provided at the center of the blade base portion 6 of the blower fan 5, and this boss portion 11
A fitting hole 12 is formed which penetrates in the axial direction. Further, a groove 13 serving as a recess is formed on the tip end side of the boss portion 11 in correspondence with the pin 9.
Reference numeral 14 denotes a spring member formed into a bifurcated shape by a spring wire, and this spring member 14 has two opposing sides 14a, 14a.
It integrally has a plastic push button 15 as an operating member formed by insert molding on the proximal end side. The spring member 14 is inserted into the blade base 6 through a hole 16 formed in the tapered tip side circumferential wall of the blade base 6, and is inserted into the blade base 6 from two opposite sides 14.
a, 14a are inserted into a holding hole 17 formed to penetrate in the radial direction in the base side circumferential wall of the boss portion 11 so as to be movable in the vertical direction as shown in the figure and expandable and contractible, and the tip portion protrudes from this holding hole 17. . In this way, the spring member 14 is attached to the blower fan 5 through the hole 16.
The spring member 14 is prevented from coming out by inserting the spring member 14 from the push button 15, and an elastic claw 15a formed integrally with the push button 15 elastically engages with the edge of the hole 16. In addition, the push button 15 is formed in FIGS. 1 and 2 so that both the wall thickness and the width gradually become smaller toward the top.
Even if a foreign object is inserted between the hole 16 and the hole 16, the push-in operation can be performed without being locked by the foreign object. Reference numeral 18 denotes an expansion convex portion as an expansion member that is integrally provided on the inner peripheral portion of the tip side of the blade base 6 on the opposite side to the hole 16, and the tip portion of this is provided as an expansion member. Tapered surfaces 18a, 18a are formed on both sides, corresponding to the tips of the two opposing sides 14a, 14a.
Then, two opposing sides 14a, 14a of the spring member 14
The tips of the tapered surfaces 18a, 18a are always in sliding contact with the upper ends of the tapered surfaces 18a, 18a. Reference numeral 19 denotes a compression coil spring as a release spring, which is fitted around the outer periphery of the boss portion 11 and has one end fixed to the boss portion 11. Then, this compression coil spring 19 is activated when the blower fan 5 is attached to the rotating shaft 8.
It comes into contact with the pin 9 and is compressed, so that an elastic force is applied to the blower fan 5 in the direction of arrow A, which is the removal direction.

Next, in the above configuration, the operation when attaching and detaching the blower fan 5 to the rotating shaft 8 of the motor 3 will be explained. First, to install the blower fan 5, hold the blade base 6 in your hand and insert the fitting hole 12 of the boss 11 into the rotating shaft 8. During this insertion process, the blade base 6
When the split groove 13 at the tip of the boss portion 11 matches the pin 9 and is pushed in against the elastic force of the compression coil spring 19, the split groove 13 fits into the pin 9 and the engaged state is established. As a result, the rotation of the rotating shaft 8 is transmitted to the blower fan 5, and the two opposing sides 14a, 14a of the spring member 14 are pushed and expanded by the tapered portion 8a at the tip of the rotating shaft 8, and the rotating shaft 8
slides on the outer circumferential surface of the When the spring member 14 encounters the engagement groove 10, the two opposing sides 14a, 1
4a restores itself in the direction of contraction due to its own elastic force, fits into and engages with the engagement groove 10, and prevents the boss portion 11 and eventually the blower fan 5 from coming off with respect to the rotating shaft 8. As described above, the blower fan 5 is attached to the rotating shaft 8, and when the motor 3 is energized and started, the blower fan 5 rotates and performs ventilation operation.

Next, in order to remove the blower fan 5 for cleaning or the like, it is sufficient to lightly hold the blade base 6 in the hand and press the push button 15. That is, by pressing the push button 15, the spring member 14 integrated with the push button 15 moves toward the expanding convex portion 18 side. Therefore, the tips of the two opposing sides 14a, 14a of the spring member 14 slide downward in FIGS. 1 and 2 along the tapered surfaces 18a, 18a of the expanding convex portion 18,
The sides 14a, 14a expand and deform against their own elastic force and come out of the engagement groove 10 of the rotating shaft 8. In this way, the two opposing sides 14a, 14 of the spring member 14
When a comes out of the engagement groove 10, the blower fan 5 slides in the direction of arrow A with respect to the rotating shaft 8 due to the elastic force of the compression coil spring 19, and is automatically pulled out from the rotating shaft 8. After that, when the push button 15 is released, the two opposing sides 14a, 14a of the spring member 14 will be moved by their own elastic restoring force to the tapered surface 18a,
18a while sliding upward in FIGS. 1 and 2, it shrinks and returns to its original state.

According to the above configuration, when the blower fan 5 is removed from the rotating shaft 8, the tip portions of the two opposing sides 14a, 14a of the spring member 14 are moved to the tapered surfaces 18a, 18a of the expansion convex portion 18 by pressing the push button 15. The structure is such that it expands and deforms by sliding on the top, unlike conventional systems in which the fan is forced to expand and deform by pulling the two opposing sides of the spring member out of the engagement groove. Even if the two opposing sides 14a, 14a of the spring member 14 are deeply fitted into the engagement groove 10, they can be removed with a small force, and the blower fan 5 can be removed easily.
In this case, if a compression coil spring 19 is provided that biases the blower fan 5 in the removal direction as in this embodiment, the two opposing sides 14a, 14 of the spring member 14
When a disengages from the engagement groove 10, the blower fan 5 is automatically pushed out from the rotating shaft 8 at the same time, so the blower fan 5 can be removed even more easily. In addition, when the blower fan 5 is attached to the rotating shaft 8, the elastic force of the compression coil spring 19 causes the two opposing sides 14a, 14a of the spring member 14 to
is in pressure contact with the inner peripheral side surface of the engagement groove 10, so even if the width of the engagement groove 10 is larger than the wire diameter of the spring member 14, the blower fan 5 will not shake in the axial direction during air blowing operation. It is possible to prevent the generation of vibration noise.

Figures 4 and 5 show another embodiment of the present invention, which differs from the previous embodiment in that the spring member is fixed to the blower fan 5 and the expansion member is movable. It is in. That is, in FIGS. 4 and 5, reference numeral 20 denotes a spring member formed into a bifurcated shape by a spring wire, and the base end portions of two opposing sides 20a, 20a of this spring member are integrally provided to protrude from the inner surface of the tip end of the blade base 21. It is fixed to the raised protrusion 21a. 22 is the blade base 2
A push button as an operating member is movably provided in the hole 23 formed in 1, and an expanding part 24 as an expanding member is integrally formed at the inner end of the blade base 21. Both sides of the portion 24 are tapered surfaces 24a, 24a corresponding to two opposing sides of the spring member 20. Even with this configuration, when the push button 22 is pressed, the expanding portion 24 moves upward in the figure and expands the two opposing sides 20a, 20a of the spring member 20 with its tapered surfaces 24a, 24a. Effects similar to those of the embodiment can be obtained.

In addition, in the above embodiments, the spring members 14, 2
0 is formed by a spring wire, but it may also be a leaf spring. Further, as in the embodiment shown in FIGS. 4 and 5, the expanding portion 24 is pushed between the two opposing sides 20a, 20a of the spring member 20 by pressing the push button 22, and the two sides 20a, 20a are expanded. In the case of an opening device, the push button 22 and the expanding portion 24 may be provided so as to be movable in the axial direction of the blade base portion 21.

In addition, the present invention is not limited to the embodiments described above and shown in the drawings, and can be applied not only to ventilation fans but also to general ventilation fan mounting devices for mounting a ventilation fan to a drive shaft, without departing from the gist. Of course, it can be implemented with appropriate modifications within the scope.

[Effects of the invention] As explained above, the present invention has a blower fan that
An expanding member having a tapered surface that is positioned correspondingly between both ends of a spring member whose end portion is bifurcated and comes into sliding contact with both ends of the spring member is provided, and an operating member that is operated by pressing is provided. When the operating member is pressed, one of the spring member and the expansion member moves in conjunction with this, and the spring member is expanded by the tapered surface of the expansion member.
This provides an excellent practical effect in that the blower fan can be easily removed.

[Brief explanation of drawings]

Figures 1 to 3 show an embodiment in which the present invention is applied to a ventilation fan. Figure 1 is a vertical side view showing the main parts, Figure 2 is a rear view of the fan, and Figure 3 shows the entire ventilation fan. FIGS. 4 and 5 are views corresponding to FIGS. 1 and 2 showing other embodiments of the present invention. In the drawing, 5 is a blower fan, 8 is a rotating shaft (drive shaft), 9 is a pin (convex part), 10 is an engagement groove, 11 is a boss part, 13 is a split groove (concave part), 14 is a spring member,
15 is a push button (operation member), 18 is an expansion convex portion (expansion member), 18a is a tapered surface, 19 is a compression coil spring (extraction spring), 20 is a spring member, 22 is a push button (operation member) ), 24 is an expansion part (expansion member),
24a indicates a tapered surface.

Claims (1)

[Claims for Utility Model Registration] 1. In a device in which a blower fan is inserted and attached to a drive shaft, a convex portion for transmitting rotation provided on the drive shaft, an engagement groove formed on the outer periphery of the drive shaft; A concave portion formed in a boss portion at the center of the blower fan and engaged with the convex portion when the boss portion is inserted into the drive shaft; a bifurcated spring member that prevents the fan from coming off, and a tapered surface that is provided on the blower fan so that its tip portion is located between the two tip portions of the spring member and that slides into contact with both tip portions of the spring member. comprising an expansion member and an operation member provided on the blower fan and operated by pressing, one of the spring member and the expansion member being movable in conjunction with the pressing operation of the operation member; By pressing the operating member, both tips of the spring member slide relative to each other on the tapered surface of the expansion member to expand, and the spring member is disengaged from the engagement groove. A blower fan mounting device characterized by: 2. The blower fan mounting device according to claim 1, wherein the boss portion is provided with an extraction spring that urges the blower fan in a direction to remove it from the drive shaft.