JPH09264290A - Elevating device of electric fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve safety of engagement of a strut and a slide pipe by forming an engaging claw which is pivotally supported in the vicinity the upper end opening port of the strut of a stand in a hook shape, and notching a recessed groove engaged with an engaging claw on the slide pipe, in an elevating device for restricting the slide of the slide pipe of an electric fan. SOLUTION: In case of assembly of an electric fan, a slide pipe 12 is pushed down in a strut 21, the slide pipe 12 is fixed by operation of an elevating device, and work is carried out. In this case, when the slide pipe 12 is pushed down, an operating lever 14 energized on the upper end of a rated load spring 19 is rotated in a clockwise direction on a place where the engaging claw 15 of the operating lever 14 and the recessed groove 17 of the slide pipe 12 are matched with each other, and the engaging claw 15 and the recessed groove 17 are engaged with each other. In the engaging condition, since a clearance meeting looseness is generated by the weight of the impeller mounted on the slide pipe 12, a motor, and the like, when a push button 16 is pushed, the operating lever 14 is rotated in a anti-clockwise direction, and engagement of the engaging claw 15 and the recessed part 17 is released comfortably.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting device for restraining sliding of a slide pipe of an electric fan.

[0002]

2. Description of the Related Art Generally, a fan is equipped with a slide mechanism that slides a slide pipe in a column of a stand in order to adjust the blade height to a desired position. here,
The slide pipe freely slides up and down in the hollow column of the stand along with the blades, motors, etc. that are mounted on the upper end via the neck piece, but it is lifted separately to fix the position of the slide pipe after sliding. Need to incorporate equipment.

An example of a conventional lifting device will be described with reference to FIG. The slide pipe 2 inserted into the hollow column 1 of the stand freely slides in the vertical direction in a state of being partially in contact with the holding piece 3. The movement of the slide pipe 2 can be restricted by an elevating device mounted on the holding piece 3, which fixes the slide pipe 2 by the following method. That is, when the slide pipe 2 is pushed into the support column 1, the engaging claws 5 of the operation lever 4 are pressed against the inner surface side of the support column 1 by the slide pipe 2. Further, when the slide pipe 2 is deeply inserted and the engaging claw 5 and the groove 6 of the slide pipe 2 are aligned with each other, the operating lever 4 biased by the spring 7 is rotated clockwise, and the engaging claw 5 is moved. Enter the groove 6 and engage with each other.

By this engagement, the movement of the slide pipe 2 is completely stopped, and the position of the slide pipe 2 can be fixed. To move the slide pipe 2 again, the push button 8 attached to the operation lever 4 is pressed to rotate the operation lever 4 counterclockwise, and the engaging claw 5 is removed from the concave groove 6 to release the restraint state. can do. In the figure, reference numeral 9 indicates a rib surrounding the push button 8.

[0005]

SUMMARY OF THE INVENTION The operating lever 4 described above.
In the ascending / descending device for engaging the engaging claw 5 and the concave groove 6 with each other, the engaging claw 5 and the concave groove 6 are engaged with each other, so that there is no problem as long as normal use is performed. However, if the push button 8 is accidentally pressed in an unintended manner, there is a problem that the engagement is easily released. That is,
Since the operation of the push button 8 does not hinder the movement of the engagement claw 5 of the operation lever 4 at all, even if a slight touch of the push button 8 causes the operation lever 4 to rotate, the engagement claw 5 can be released. It will come off from the groove 6.

At this time, the unrestricted slide pipe 2 vigorously pops out of the column 1 by the action of a spring (not shown), and for example, the upper end of the slide pipe 2 approaches the user during assembly, which puts the body at risk. Inconvenience may occur.

It has been proposed to surround the push button 8 with a rib 9 as shown in FIG. 8 so that a finger or the like does not accidentally touch the push button 8. However, such inconvenience often occurs and it is effective. Is not a solution.

Therefore, an object of the present invention is to prevent the operation lever from rotating when the electric fan is upside down to prevent the slide pipe from jumping out from the support, and in operation to rotate the operation lever without difficulty. It is an object of the present invention to provide a lifting device for a fan that can easily release the restraint of the fan.

[0009]

According to a first aspect of the present invention, there is provided an operating lever rotatably provided near an upper end opening of a column of a stand and having an engaging claw biased by a spring with respect to a slide pipe, The engaging claws are determined in the lifting device of the fan, which comprises a concave groove formed in the slide pipe so as to engage with the engaging claw of the operating lever when the slide pipe is pushed into the lower part of the support column. It is characterized in that it is formed into a hook shape while maintaining a bending angle, and that the concave groove is engraved at an angle corresponding to the bending angle of the engaging claw and with a predetermined amount of play. is there.

Further, the invention according to claim 2 is characterized in that the support column is provided with a holding piece attached to the upper end opening, and an operating lever having an engaging claw is rotatably provided on the holding piece. .

The invention according to claim 3 is characterized in that the spring force for urging the operation lever is applied by the end portion of the constant load spring arranged on the back side of the operation lever. .

[0012]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, a slide pipe 12 is inserted inside a hollow pillar 11 of the stand so as to partially contact a holding piece 13. An operation lever 14 is rotatably provided on the holding piece 13. The operating lever 14 is integrally provided with an engaging claw 15 at one end and a push button 16 at the other end. The concave groove 1 is formed on the outer surface of the slide pipe 12 facing the engaging claw 15 of the operation lever 14.
7 are formed. The detailed structure of the engaging claw 15 and the concave groove 17 will be described later with reference to the drawings.

Further, in the present embodiment, a constant load spring 19 supported by a spring receiver 18 is provided along the column 11 on the back side of the operation lever 14. The portion of the constant load spring 19 that extends from the spring receiver 18 is configured to act as a spring that biases the operation lever 14 toward the slide pipe 2, and the operation lever 14 is fixed.
A convex portion 20 is formed on the operation lever 14 so as to abut against the.

FIG. 2 shows the details of the engaging claw 15 and the concave groove 17. The hook-shaped bent engaging claw 15 maintains a bending angle θ in the range of 55 ° to 75 °. The groove 17 is formed so as to be tilted at an angle corresponding to the bending angle. Further, the groove 17 is formed to have a size with a play a in order to have a size that has a margin exceeding the thickness of the engaging claw 15.

Next, the operation of the present embodiment will be described with reference to FIGS.

For example, in assembling a fan, the slide pipe 12 may be pushed into the inside of the column and the slide pipe 12 may be fixed by the operation of the lifting device. At this time, when the slide pipe 12 is pushed in, the engaging claw 15 of the operation lever 14 and the slide pipe 1
When the second concave groove 17 is fitted, the operation lever 14 biased by the upper end of the constant force spring 19 is rotated clockwise, and the engaging claw 15 and the concave groove 17 are engaged with each other. In this state, when the slide pipe 12 on which the blades, motors, etc. are mounted is directed downward for the purpose of work in this state, the engaging claws 15 become concave grooves 17 as shown in FIG. It is pressed against an angled surface and meshes.

Even if the user mistakenly presses the push button 16 while maintaining this engagement, the engaging claw 15 abuts the inclined surface, so that the operation lever 1 is strongly engaged.
4 does not rotate at all. For this reason, it is possible to avoid safety inconveniences such as the slide pipe 12 suddenly popping out, approaching the user, and putting the body at risk.

On the other hand, the normally assembled fan is used with the slide pipe 12 standing upright on the column 11 of the stand. The engagement between the engaging claw 15 and the groove 17 is shown in FIG.
As shown in FIG. 7, a gap commensurate with the play a is created due to the weight of the blades, the motor, etc. mounted on the slide pipe 12. That is, the groove 17 is made larger in advance by the amount of play a in addition to the thickness of the engaging claw 15, and this margin allows the engagement of the engaging claw 15 to be weakened when it is not upside down. Therefore, when the push button 16 is pressed, the operation lever 14 rotates counterclockwise, and the engaging claw 15 comes out of the concave groove 17 as shown in FIG.
This makes it possible to release the restraint state of the slide pipe extremely easily.

Further, another embodiment of the present invention will be described with reference to the drawings. In FIG. 5, a slide pipe 22 is inserted inside the hollow column 21 of the stand so as to partially contact the holding piece 23. An operation lever 24 is rotatably provided on the holding piece 23. The operating lever 24 is integrally provided with an engaging claw 25 at one end and a push button 26 at the other end.

A retainer 27 made of synthetic resin is provided at the lower end opening of the slide pipe 22. The detailed structure of the retainer 27 will be described later with reference to the drawings. Further, a mainspring-shaped constant force spring 29 supported by a spring receiver 28 is provided along the back column 21 of the operation lever 24. This constant force spring 29
A part of the rolled wire is stored in the retainer 27. In the figure, reference numeral 30 indicates the operation lever 24 and the constant force spring 29.
It shows a convex portion to be brought into contact with. Reference numeral 31 indicates a guide rib.

6 (a) and 6 (b) show details of the retainer 27. The retainer 27 includes an insertion portion 32 that fits into the slide pipe 22, and the insertion portion 32.
A spring chamber 33 for accommodating a constant force spring 29 provided inside the guide, a guide portion 34 below the insertion portion 32 and engaged with the guide rib 31 of the support column 21, and an insertion portion 3
2 and a braking piece 35 that extends downward and extends downward.

In order to attach the retainer 27 having the above structure to the slide pipe 22, the insertion portion 32 of the spring retainer 27 is inserted into the lower end opening of the slide pipe 22,
It can be fixed to the slide pipe 22 by pushing it inside. Further, in order to insert the slide pipe 22 to which the retainer 27 is fixed into the pillar 21, the constant force spring 29 and the holding piece 23 are attached to the pillar 21, and the two guide portions 34 of the retainer 27 are contracted inward. It is assembled according to the guide rib 31.

At this time, the two guide portions 34 are connected to the braking piece 35.
There is no difficulty associated with wearing because the deep incision along the edge makes it easy to shrink inward with just the force applied by your finger and does not require a particularly large force. When the assembly of the slide pipe 22 is completed, the constant force spring 29 moves the braking piece 35.
Along with it, it is accurately placed in the spring chamber 33 of the retainer 27 (Fig. 5
reference).

As described above, in this embodiment, since the guide portion 34 is provided in accordance with the cut of the braking piece 35 extending from the insertion portion 32, the guide portion 34 can be easily contracted with a slight force. There is no difficulty associated with mounting the slide pipe 22, and it is possible to assemble it extremely easily.

Further, the guide portion 34 of the retainer 27 is easily contracted by an extremely weak force, and there is no possibility of causing permanent deformation.

Further, another embodiment of the present invention will be described with reference to the drawings. In FIG. 7, a slide pipe 42 is provided inside the hollow column 41 of the stand so as to partially contact the holding piece 43. An operating lever 44 is rotatably provided on the holding piece 43. The operating lever 44 is integrally provided with an engaging claw 45 at one end and a push button 46 at the other end. Further, a retainer 47 is provided at the lower end opening of the slide pipe 42.

Further, the column 41 on the back side of the operation lever 44
A constant force spring 49 supported by a spring receiver 48 is provided along the. The wound part of the constant force spring 49 is housed in the retainer 47.

On the other hand, a guide rib 50 extending in the vertical direction is provided on the inner surface of the column 41, and the guide portion 51 of the retainer 47 is provided.
Is engaged with. In the figure, only one guide rib 50 is shown, but another guide rib (not shown) is provided on the inner surface of the support column 41 facing the guide rib 50, which also serves as a guide portion (not shown) of the retainer 47. Engaged.

Further, a retaining rib 52 extending to the slide pipe 42 is provided on the inner surface of the column 41.
The holding rib 52 is formed so as to maintain a gap of 0.2 to 0.4 mm between the holding rib 52 and the outer surface of the slide pipe 42.

In the electric fan having the above structure, when a force in the arrow direction acts on the slide pipe 42 at the upper end of the support column 41, the lower end of the slide pipe 42 tries to fall in the opposite direction with the holding piece 43 as a fulcrum. At this time, the holding rib 52 extending in the direction of the slide pipe 42 and the outer surface of the slide pipe 42 are in contact with each other, and the increase in the inclination of the slide pipe 42 is received.

This makes it possible to prevent an excessive force from acting on the guide portion 51 of the retainer 47 and prevent the guide portion 21 from coming off from the engaging guide rib 50. Further, a slight gap is maintained between the holding rib 52 and the outer surface of the slide pipe 42, the holding rib 52 does not come into contact with the sliding pipe 42 during sliding, and the outer surface of the slide pipe 42 is not scratched or the like. I can't get it.

As described above, in this embodiment, when the slide pipe 42 is about to fall down at the upper end of the column, the holding rib 52 contacts the slide pipe 42, and it is possible to receive the inclination of the posture of the slide pipe 42. Therefore, it is possible to reliably prevent the guide portion 51 from coming off the guide rib 50 and preventing the slide pipe 42 from sliding in the support column 41.

[0033]

As described above, according to the present invention, the operating lever is provided with the engaging claw which is bent in a hook shape while keeping the predetermined bending angle, and is engaged with the concave groove having the play inclined at the same angle. Therefore, when the fan is upside down, it prevents the operation lever from rotating and prevents the slide pipe from jumping out unexpectedly.When using the fan, keep the operation lever normally rotating and easily release the slide pipe from the restrained state. It is possible to improve the safety of the fan.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a lifting device for a fan according to the present invention.

FIG. 2 is a sectional view showing details of the lifting device shown in FIG.

FIG. 3 is a cross-sectional view showing an engaged state at the time of assembling the lifting device shown in FIG.

FIG. 4 is a cross-sectional view showing a state where engagement of engagement claws is released.

FIG. 5 is a sectional view showing another embodiment of the present invention.

6 (a) is a rear view of the retainer shown in FIG. 5,
(B) The bottom view of the same retainer.

FIG. 7 is a sectional view showing another embodiment of the present invention.

FIG. 8 is a cross-sectional view showing a conventional lifting device for a fan.

[Explanation of symbols]

 11, 21, 41 Strut 12, 22, 42 Slide pipe 14, 24, 44 Operating lever 15, 25, 45 Engaging claw 17 Recessed groove 27, 47 Retainer 29, 49 Constant load spring 31, 50 Guide rib 32 Insert part 34 Guide part 52 Holding rib

Claims (3)

[Claims] 1. An operating lever rotatably provided near an upper end opening of a column of a stand and having an engaging claw biased by a spring with respect to a slide pipe, and the slide pipe being pushed into a lower portion of the column. When the fan is lifted, the engaging claw keeps a predetermined bending angle in the lifting device of the fan, which is provided with a concave groove formed in the slide pipe so as to engage with the engaging claw of the operation lever. And a hook shape, and the concave groove is engraved at an angle corresponding to the bending angle of the engaging claw and maintaining a predetermined amount of play, and a lifting device for a fan. 2. The fan according to claim 1, wherein the support column is provided with a holding piece attached to an upper end opening thereof, and an operating lever having the engaging claw is rotatably provided on the holding piece. lift device. 3. The lifting and lowering of the fan according to claim 1, wherein a spring force for urging the operation lever is applied by an end portion of a constant load spring arranged on the back side of the operation lever. apparatus.