JP2010048203A - Blast fan device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blast fan device certainly preventing a blast fan from being detached by stabilizing engagement of an engagement member with an engagement groove. <P>SOLUTION: This blast fan device includes: the engagement groove 26 formed in the peripheral portion of a rotating shaft 25; the tabular engagement member 40 provided to the blast fan 30 and preventing detachment of the blast fan 30 by being engaged with the engagement groove 26; a push button 60 moving the engagement member 40 by pressing operation; and a tabular plate spring 50 abutting on the end 41 of the engagement member 40. The push button 60 is operated to be push-pressed, thereby the engagement hole 42 of the engagement member 40 is disengaged from the engagement groove 26 of the rotating shaft 25. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a blower fan device having a structure in which a flat engagement member provided on a blower fan is engaged with an engagement groove formed on a rotary shaft, and the blower fan is attached to the rotary shaft in a state of being prevented from being detached. The present invention relates to a fan that can more reliably prevent a fan from being pulled out.

  For example, in a blower fan device such as a ventilating fan, one that facilitates the attachment / detachment operation of a drive motor and a blower fan is known (for example, see Patent Document 1). As shown in FIGS. 10 and 11, the engaging groove 202 is formed on the outer peripheral portion of the rotating shaft 201 of the drive motor 200, and the engaging member 220 is provided on the blower fan 210. The engaging member 220 is formed in a bifurcated shape having a pair of spring wire portions 221, and a plastic push button 222 as an operation member is provided on the base end side thereof. The blower fan 210 is provided with an expanded portion 230 having a tapered surface 231 for expanding the pair of spring wire portions 221. In FIG. 10, reference numeral 240 denotes a boss portion, 241 denotes a concave portion of the boss portion, and 203 denotes a pin.

In such a blower fan device, the pin 203 is engaged with the concave portion 241 of the boss portion 240 to transmit the rotational force. Further, the spring wire portion 221 is engaged with the engaging groove 202 by the spring force in the reduction direction, and the blower fan 210 is attached to the rotating shaft 201 in a state of being prevented from being detached, and the push button 222 is moved in the distal direction of the spring wire portion 221. By operating, both ends of the spring wire portion 221 are configured to slide and expand on the tapered surface 231 of the expanding portion 230 so as to be disengaged from the engaging groove 202.
Japanese Utility Model Publication 3-41115

  The above-described blower fan device has the following problems. That is, since the spring wire portion 221 that engages with the engagement groove 202 is a wire, the amount of engagement between the spring wire portion 221 that is the engagement member and the engagement groove 202 is not stable. Therefore, if for some reason a force in the direction of disconnection is applied to the blower fan 210 and the mounting state is incomplete, the spring wire portion 221 is detached from the engagement groove 202, and the blower fan 210 is removed from the rotating shaft 201. There is a risk of falling off.

  Therefore, an object of the present invention is to provide a blower fan device that can stably increase the amount of engagement between the engagement member and the engagement groove and more reliably prevent the blower fan from coming off.

  In order to solve the above problems and achieve the object, the blower fan apparatus of the present invention is configured as follows.

  In the blower fan device in which the blower fan is detachably attached to the rotation shaft, the rotation transmission portion provided in the rotation shaft, the engagement groove formed in the outer peripheral portion of the rotation shaft, and the rotation fan provided in the rotation fan. A rotation transmission part that engages with the rotation transmission part by insertion into a shaft, a flat engagement member provided in the blower fan perpendicular to the rotation shaft, and provided in the engagement member, An engagement hole that engages with an engagement groove to prevent the blower fan from being removed, a spring member that is disposed on the distal end side of the engagement member, and a biasing force of the spring member by a pressing operation And an operation member that moves the engagement hole in a direction orthogonal to the rotation axis of the engagement member and removes the engagement hole from the engagement groove.

  Alternatively, in the blower fan device in which the blower fan is detachably attached to the rotation shaft, the rotation transmission portion provided in the rotation shaft, the engagement groove formed in the outer peripheral portion of the rotation shaft, and the blower fan are provided. A rotation transmission portion that engages with the rotation transmission portion by insertion into the rotation shaft, and a flat plate-like first half-engagement member that opens and closes with a fulcrum shaft provided parallel to the rotation shaft as a rotation shaft And a flat plate-like second half-engagement member, and the first half-engagement member provided on the second half-engagement member side and engaged with the engagement groove to prevent the blower fan from coming off. And a second notch that is provided on the first half-engagement member side of the second half-engagement member and engages with the engagement groove to prevent the blower fan from coming off. A notch, the first half-engaging member, and the second half-engaging member; A spring member that biases the engagement member and the second half-engagement member in a closing direction, and the first half-engagement member and the second half-engagement member that are closed by a pressing operation; And an operation member that opens against a biasing force of the member and removes the first notch and the second notch from the engagement groove of the rotating shaft.

  According to the present invention, it is possible to stably increase the amount of engagement between the engagement member and the engagement groove and more reliably prevent the blower fan from coming off.

  FIG. 1 is a longitudinal sectional view showing a schematic configuration of a ventilating fan (blower fan device) 10 according to a first embodiment of the present invention, FIG. 2 is a rear view showing an essential part of the ventilating fan 10 in an engaged state, and FIG. The rear view which shows the principal part of the release state in the ventilation fan 10, FIG. 4 is a perspective view which cuts and shows the principal part in the ventilation fan 10 partially.

  The ventilation fan 10 includes a main body 20 that is fixed to a wall or the like, and a blower fan 30 that is detachably attached to the main body 20.

  The main body 20 includes a rectangular outer frame 21. A bell mouth 22 is attached to the indoor side of the outer frame 21, and a wind pressure releasing shutter 23 is attached to the outdoor side. A drive motor 24 is attached to the center of the outer frame 21. The drive motor 24 is provided with a rotating shaft 25 to which the blower fan 30 is detachably attached.

  The blower fan 30 is formed by radially projecting blade pieces 32 on the outer peripheral portion of a cylindrical blade base 31, and a fitting hole 33 a fitted to the rotary shaft 25 is formed at the center of the blade base 31. A stepped cylindrical boss portion 33 is provided in a protruding manner. As shown in FIG. 4, a concave portion (rotation transmission portion) 34 is formed on the tip surface of the boss portion 33, and when the blower fan 30 is mounted on the rotary shaft 25, the concave portion 34 is formed on the rotary shaft 25. It is configured to be engaged with both end portions of a pin (rotation transmitting portion) 25a fixed to the head. The engagement between the recess 34 and the pin 25a has a function of transmitting rotation from the rotary shaft 25 to the blower fan 30.

  The rotary shaft 25 has an engagement groove 26 formed on the outer peripheral portion, and a tapered shaft tip 25b formed on the tip. The blower fan 30 has a flat plate-like engagement member 40, a leaf spring (spring member) 50 that abuts on the tip 41 of the engagement member 40, and the leaf spring 50 at both ends of the leaf spring 50. A pair of fixing portions 36 that are fixed at an interval larger than the length in the width direction orthogonal to the longitudinal direction of 40 are provided.

  As shown in FIGS. 2 and 3, the engagement member 40 is a circular shape having a smooth tapered tip 41 and a diameter larger than the diameter of the cross section of the engagement groove 26 and smaller than the diameter of the cross section of the rotating shaft 25. An engagement portion 42a which is a hole, and a part of a release portion 42b which is a circular hole which is located on the opposite side of the tip portion 41 with respect to the engagement portion 42a and has a diameter slightly larger than the diameter of the cross section of the rotating shaft 25 And an engagement hole 42 having a shape overlapping with each other. The engaging portion 42 a of the engaging hole 42 engages with the engaging groove 26 and restricts the movement of the rotating shaft 25 in the axial direction. The rotating shaft 25 is easily inserted into the release portion 42b of the engagement hole 42.

  A plastic push button (operation member) 60 is provided at the end of the engagement member 40 opposite to the tip 41. When the push button 60 receives a pressing operation, the push member 60 moves the engaging member 40 toward the tip 41.

  The leaf spring 50 is in contact with the distal end portion 41 of the engaging member 40 and is biased in the reverse direction when pressed by the distal end portion 41.

  The engaging member 40 is moved into an engaged state in which the engaging portion 42a is located concentrically with the fitting hole 33a and a released state in which the releasing portion 42b is located concentrically with the fitting hole 33a by operating the push button 60 or the like. Moving. The engaging member 40 is normally positioned in the engaged state by the bias of the leaf spring 50, and moves to the released state when the push button 60 is pressed.

  A method for attaching and detaching the main body 20 and the blower fan 30 thus configured will be described. When the blower fan 30 is attached, the push button 60 is pressed to move the engaging member 40 to the released state. In this state, the rotating shaft 25 is inserted into the fitting hole 33a from the boss portion 33 side. Since the engaging member 40 is in the released state, the rotating shaft 25 can be easily inserted into the releasing portion 42 b of the engaging hole 42.

  When the rotary shaft 25 is inserted into the release portion 42 b and the pressing operation of the push button 60 is released in a state where the engaging hole 42 and the engaging groove 26 are in the same position, the engaging member 40 is engaged by the urging of the leaf spring 50. It becomes a joint state. That is, the engagement portion 42 a of the engagement hole 42 is engaged with the engagement groove 26. At the same time, the recess 34 engages with both ends of the pin 25a. As a result, the engagement portion 42 a of the engagement hole 42 is engaged with the engagement groove 26 by the urging of the leaf spring 50, so that the blower fan 30 is attached to the rotating shaft 25 in a retaining state.

  Therefore, the engagement fan 40 prevents the blower fan 30 from coming off. Further, the concave portion 34 engages with both end portions of the pin 25a, so that the rotation transmission from the rotary shaft 25 to the blower fan 30 is possible.

  When removing the blower fan 30, the push button 60 is pressed to move the engagement member 40 to the released state, and the engagement between the engagement portion 42a and the engagement groove 26 is released. The blower fan 30 is detached from the rotary shaft 25 by pulling out the blower fan 30 toward the distal end of the rotary shaft 25 in a state where the rotary shaft 25 and the release portion 42b of the engagement hole 42 are concentric.

  As described above, the engaging member 40 is a flat plate member, and the engaging portion 42 a of the engaging hole 42 provided in the engaging member 40 engages with the engaging groove 26. Since the engagement amount of the flat engagement member 40 with the engagement groove 26 is more stable than when a wire is used, it is possible to reliably prevent the blower fan 30 from inadvertently falling off the rotating shaft 25.

  Further, if the engaging portion 42a is not completely engaged with the engaging groove 26 at the time of mounting, the edge of the engaging portion 42a remains on the rotary shaft 25 or the shaft tip 25b even if the pressing operation of the push button 60 is released. The engaging member 40 remains in the released state. That is, since the push button 60 is stopped in the state where the push button 60 is pushed into the blower fan 30 as in the case where the push operation is performed, the operator can recognize that the mounting is incomplete. Attachment to the rotating shaft 25 is ensured.

  FIG. 5 is a front view showing the engagement hole 42 of the engagement member 40 in the ventilation fan 10A according to the second embodiment of the present invention. In this figure, the same functional parts as those in FIGS. 1 to 4 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the ventilation fan 10A according to the present embodiment, the engagement hole 42 of the engagement member 40 is provided with an edge portion 42c between the engagement portion 42a and the release portion 42b of the engagement hole 42, and is tapered. It is a hole with a shape. That is, the engagement hole 42 is formed by an arcuate edge formed by the engagement portion 42a and the release portion 42b and an edge portion 42c that narrows toward the distal end portion 41 of the engagement member 40 that connects the edges. The

  According to the ventilation fan 10A according to the present embodiment, in addition to the method of pressing the push button 60 to move the engaging member 40 to the released state and attaching the blower fan 30 to the rotating shaft 25 as in the first embodiment, The blower fan 30 can be easily attached to the rotating shaft 25 by the following method.

  When the blower fan 30 is attached to the rotary shaft 25, the fitting hole 33a of the blower fan 30 is pushed into the rotary shaft 25 from the boss portion 33 side. Since the engaging member 40 is in the engaged state, when the rotary shaft 25 is inserted, the middle portion in the longitudinal direction of the shaft tip 25b comes into contact with the edge of the engaging portion 42a. When further pushed in that state, the tapered shaft tip 25b presses the edge of the engaging portion 42a toward the tip 41 of the engaging member 40. When the shaft tip 25b presses the edge of the engaging portion 42a with a force equal to or greater than the elasticity of the leaf spring 50, the shaft tip 25b moves the engaging member 40 toward the tip 41.

  When the engaging member 40 is moved to the released state and the rotating shaft 25 is further pushed in, the rotating shaft 25 is inserted into the release portion 42b concentric with the fitting hole 33a and the rotating shaft 25. When the rotary shaft 25 is inserted into the release portion 42 b and the engagement hole 42 and the engagement groove 26 are in the same position, the engagement member 40 is engaged by the bias of the leaf spring 50. That is, the engagement portion 42 a of the engagement hole 42 is engaged with the engagement groove 26. At the same time, the recess 34 engages with both ends of the pin 25a. As a result, the engagement portion 42 a of the engagement hole 42 is engaged with the engagement groove 26 by the urging of the leaf spring 50, so that the blower fan 30 is attached to the rotating shaft 25 in a retaining state.

  As described above, when the blower fan 30 is attached to the rotary shaft 25, the engaging portion 42a smoothly engages with the engagement groove 26 by simply pushing the blower fan 30 into the rotary shaft 25. Since it can be attached to the rotary shaft 25, the attachment workability is improved.

  FIG. 6 is a perspective view showing a cutaway part of the main part in the engaged state of the ventilation fan 10B according to the third embodiment of the present invention, and FIG. 7 is a part of the main part in the non-engaged state of the ventilation fan 10B. It is a perspective view which cuts and shows. In these drawings, the same functional parts as those in FIGS. 1 to 4 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the ventilation fan 10B according to the present embodiment, the engagement member 40 has a second engagement hole 80 that is a rectangular hole. The blower fan 30 has an insertion hole 38 provided in the blade base 31 and a second engagement member 90.

  The second engagement hole 80 is provided at a position located directly below the second engagement member 90 in the engaged state.

  The second engagement member 90 includes a knob (second operation member) 91 provided outside the blade base 31, a shaft 92 extending from the knob 91 and passing through the insertion hole 38, and a shaft 92 within the blade base 31. And an engagement piece 93 provided at the tip. The engagement piece 93 is a member that can be inserted into the second engagement hole 80, and the upper surface 93 a has a rectangular shape similar to that of the second engagement hole 80. The second engagement member 90 can move up and down in the longitudinal direction within the range of the shaft 92 in the insertion hole 38.

  In the engaged state, the second engagement member 90 can insert the engagement piece 93 into the second engagement hole 80, and can rotate around the shaft 92 by turning the knob 91. .

  The ventilation fan 10B according to the present embodiment attaches and detaches the blower fan 30 and the rotating shaft 25 as follows. When the blower fan 30 is attached, the engagement piece 93 can be inserted into the second engagement hole 80 in a state where the blower fan 30 is attached to the rotary shaft 25 as in the first embodiment or the second embodiment. The knob 91 is rotated in the direction, and the second engagement member 90 is pushed in. When the second engagement member 90 is pushed in until the knob 91 contacts the blade base 31, the engagement piece 93 is inserted into the second engagement hole 80.

  When the knob 91 is rotated by 90 ° with the engagement piece 93 inserted through the second engagement hole 80, the engagement piece 93 also rotates. Thereby, the upper surface 93 a is caught by the engaging member 40, and the engaging piece 93 is engaged with the second engaging hole 80. In this state, since the engagement piece 93 and the shaft 92 are inserted through the second engagement hole 80, the engagement member 40 is fixed in the engaged state.

  When removing the blower fan 30, the knob 91 is rotated in a direction in which the engagement piece 93 can be inserted into the second engagement hole 80, and the second engagement member 90 is pulled up. When the second engagement member 90 is pulled up, the engagement piece 93 is pulled out from the second engagement hole 80. As a result, the engagement between the second engagement member 90 and the second engagement hole 80 is released, and thus the blower fan 30 is rotated by moving the engagement member 40 to the released state by the pressing operation of the push button 60. It can be removed from the shaft 25.

  Further, if the engaging portion 42a is not completely engaged with the engaging groove 26 at the time of mounting, the second engaging hole 80 is located at a position shifted from directly below the second engaging member 90. Even if the second engagement member 90 is pushed in, the engagement piece 93 collides with the engagement member 40 and stops. That is, since the knob 91 is in a state of floating from the blade base 31, the operator can recognize that the attachment is incomplete.

  Thereby, attachment of the ventilation fan 30 can be ensured and it can prevent reliably that the ventilation fan 30 falls off from the rotating shaft 25 carelessly.

  FIG. 8 is a rear view of the main part showing the engaged state of the ventilating fan 10C according to the fourth embodiment of the present invention, and FIG. 9 is the main part showing the released state of the ventilating fan 10C according to the fourth embodiment of the present invention. It is a rear view of a part. In these drawings, the same functional parts as those in FIGS. 1 to 4 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The blower fan 30 is provided with an engagement mechanism 100 in place of the engagement member 40 in the first embodiment, and a push button 60 having a tapered portion 62 that comes into contact with the engagement mechanism 100.

  The engagement mechanism 100 includes a flat plate-shaped first half-engagement member 101 having a first cutout 105, a flat plate-shaped second half-engagement member 102 having a second cutout 106, and a rotating shaft 25. A fulcrum shaft 103 that is provided in parallel and supports the first half-engagement member 101 and the second half-engagement member 102 so as to be capable of opening and closing in a plane perpendicular to the rotation axis, and the first half-engagement member 101. And a coil spring 104 provided over the second half-engaging member 102.

  The first half-engagement member 101 and the second half-engagement member 102 are urged by the coil spring 104 in a direction in which the first half-engagement member 101 and the second half-engagement member 102 are closed. . When the push button 60 is pressed, the taper portion 62 of the push button 60 pushes and opens between the first half-engagement member 101 and the second half-engagement member 102 against the biasing force of the coil spring 104. In the state where the first half-engagement member 101 and the second half-engagement member 102 are pushed open, the gap between the first half-engagement member 101 and the second half-engagement member 102 is the rotation shaft 25. Is wide enough to be inserted easily.

  The first cutout 105 and the second cutout 106 are semicircular cutouts provided in the first half-engagement member 101 and the second half-engagement member 102. In a state where the two half-engaging members 102 are closed, a circular hole having a diameter larger than the diameter of the cross section of the engaging groove 26 provided in the rotating shaft 25 and smaller than the diameter of the cross section of the rotating shaft 25 is formed. It is a notch.

  The first half-engagement member 101 and the second half-engagement member 102 of the engagement mechanism 100 are closed by the operation of the push button 60 or the like. And the released state in which the first half-engagement member 101 and the second half-engagement member 102 are pushed open. The engagement mechanism 100 is normally positioned in the engaged state by the bias of the coil spring 104, and moves to the released state when the push button 60 is pressed.

  A method for attaching and detaching the rotary shaft 25 and the blower fan 30 configured as described above will be described. When the blower fan 30 is attached, the push button 60 is pressed to move the first half-engagement member 101 and the second half-engagement member 102 of the engagement mechanism 100 to the released state. In this state, the rotating shaft 25 is inserted from the boss 33 side into the fitting hole 33a. Since the engagement mechanism 100 is in the released state, the rotating shaft 25 can be easily inserted into the gap between the first half-engagement member 101 and the second half-engagement member 102.

  The rotary shaft 25 is inserted into the gap between the first half-engagement member 101 and the second half-engagement member 102, and the first notch 105, the second notch 106, and the engagement groove 26 are in the same position. When the pressing operation of the push button 60 is released in the state where the first half-engaging member 101 and the second half-engaging member 102 are engaged, the coil spring 104 is biased. That is, the first notch 105 and the second notch 106 are engaged with the engaging groove 26. At the same time, the recess 34 engages with both ends of the pin 25a.

  As a result, the first half-engaging member 101 and the second half-engaging member 102 are engaged with the engaging groove 26 by the bias of the coil spring 104, so that the blower fan 30 is prevented from being detached from the rotating shaft 25. It will be attached to.

  Therefore, the engagement mechanism 100 prevents the blower fan 30 from coming off. Further, the concave portion 34 engages with both end portions of the pin 25a, so that the rotation transmission from the rotary shaft 25 to the blower fan 30 is possible.

  When removing the blower fan 30, the push button 60 is pressed to move the first half-engagement member 101 and the second half-engagement member 102 of the engagement mechanism 100 to the released state, and the first notch 105 and The engagement between the second notch 106 and the engagement groove 26 is released. With the first half-engagement member 101 and the second half-engagement member 102 pushed and opened, the blower fan 30 is detached from the rotary shaft 25 by pulling the blower fan 30 toward the distal end of the rotary shaft 25.

  As described above, the first half-engagement member 101 and the second half-engagement member 102 are flat members, and are provided on the first half-engagement member 101 and the second half-engagement member 102. The first notch 105 and the second notch 106 engage with the engaging groove 26. Since the first notch 105 and the second notch 106 are engaged with the engagement groove 26 over the entire circumferential surface of the engagement groove 26, the amount of engagement with the engagement groove 26 is more stable than when a wire is used. Therefore, it is possible to reliably prevent the blower fan 30 from inadvertently falling off the rotating shaft 25.

  In addition, this invention is not limited to the said embodiment. For example, although the ventilation fan was demonstrated as a ventilation fan apparatus in the said embodiment, this invention is applicable also to a fan.

Of course, various modifications can be made without departing from the scope of the present invention.

The longitudinal cross-sectional view which shows schematic structure of the ventilation fan which concerns on the 1st Embodiment of this invention. The rear view which shows the principal part in the engagement state of the ventilation fan. The rear view which shows the principal part in the open state of the ventilation fan. The perspective sectional view of the important section of the ventilation fan. The front view which shows the engaging member in the 2nd Embodiment of this invention. The perspective view of the principal part in the engagement state in the 3rd Embodiment of this invention. The perspective view which shows the principal part in the non-engagement state of the ventilation fan. The rear view of the principal part in the engagement state in the 4th Embodiment of this invention. The rear view of the principal part in the open state of the ventilation fan. The longitudinal cross-sectional view which shows the conventional ventilation fan. The rear view which shows the principal part of the ventilation fan.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Ventilation fan, 25 ... Rotating shaft, 26 ... Engagement groove, 30 ... Blower fan, 40 ... Engagement member, 42 ... Engagement hole, 50 ... Leaf spring, 60 ... Push button

Claims (4)

In the blower fan device that detachably attaches the blower fan to the rotating shaft,
A rotation transmitting portion provided on the rotating shaft;
An engaging groove formed on the outer periphery of the rotating shaft;
A rotation transmission part which is provided in the blower fan and engages with the rotation transmission part by insertion into the rotation shaft;
A flat engagement member provided in the blower fan perpendicular to the rotation axis;
An engagement hole provided in the engagement member and engaged with the engagement groove to prevent the blower fan from coming off;
A spring member disposed on the distal end side of the engaging member;
An operation of releasing the engagement between the engagement hole and the engagement groove by moving the engagement member in a direction orthogonal to the rotation axis of the engagement member against the urging force of the spring member by a pressing operation. A blower fan device comprising: a member.   The blower fan device according to claim 1, wherein the engagement hole of the engagement member has a tapered shape that narrows toward a distal end direction of the engagement member. A second engagement hole provided in the engagement member;
A second engagement member provided on the blower fan and engaged with the second engagement hole;
A second operating member provided on the second engaging member, wherein the second engaging member is engaged with the second engaging hole by an operation in a state where the engaging member is prevented from coming off. The blower fan device according to claim 1, comprising: In the blower fan device that detachably attaches the blower fan to the rotating shaft,
A rotation transmitting portion provided on the rotating shaft;
An engaging groove formed on the outer periphery of the rotating shaft;
A rotation transmission part which is provided in the blower fan and engages with the rotation transmission part by insertion into the rotation shaft;
A flat plate-like first half-engagement member and a flat plate-like second half-engagement member that open and close using a fulcrum shaft provided parallel to the rotation shaft as a rotation shaft;
A first notch that is provided on the second half-engaging member side of the first half-engaging member, engages with the engaging groove, and prevents the blower fan from coming off;
A second notch that is provided on the first half-engagement member side of the second half-engagement member and engages with the engagement groove to prevent the blower fan from coming off;
A spring member provided across the first half-engagement member and the second half-engagement member and biasing the first half-engagement member and the second half-engagement member in a closing direction;
The first half-engagement member and the second half-engagement member closed by a pressing operation are opened against the urging force of the spring member, and the first notch and the second notch are opened. An air blower device comprising an operation member for removing the engaging shaft from the engaging groove.

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