JP2020133685A - Attachment/detachment device and range hood - Google Patents

Abstract

To provide a general-purpose attachment/detachment device which can be used in common even if shapes of tip parts of drive shafts are different, and can be held at a prescribed position of the drive shaft.SOLUTION: This attachment/detachment device 10 for detachably holding a drive shaft 20 and a rotating body 4 has an energization part 13 for energizing a lock member 14 arranged at the attachment/detachment device 10 to a side of a release part 12, and a common abutment part 144 arranged at the lock member 14. The common abutment part 144 can abut on tips of the drive shafts 20 having different shapes, the drive shaft 20 is brought into a held state by the bridging of the lock member 14 and the release part 12 by the movement of the lock member 20 by a prescribed distance <b> while withstanding the energization of the energization part 13 after the tip part of the drive shaft 20 abuts on the common abutment part 144, and a rotating body 4 is attached.SELECTED DRAWING: Figure 14

Description

The present invention relates to a fan attachment / detachment device and a range hood provided with the attachment / detachment device.

The range hood is equipped with a rotating body such as a sirocco fan for exhausting and a grease filter for collecting oil smoke and the like. These rotating bodies are rotated by a motor to recover the exhaust gas and the oil contained in the exhaust gas.
Rotating bodies such as sirocco fans and grease filters require regular cleaning because oil and the like derived from oil smoke generated by cooking tend to adhere to them. Therefore, in order to clean the dirty rotating body, it is necessary to periodically remove the rotating body from the drive shaft.
For example, in Patent Document 1, the drive shaft and the fan are fastened by rotationally inserting a knob into the thread groove portion at the tip of the drive shaft. In the case of such a mounting structure, it was necessary to rotate the knob to attach / detach the fan each time cleaning was performed. Fans are often installed at high places that are difficult to reach or horizontally, and it takes time and effort to rotate the knobs to attach and detach them.

In order to reduce such time-consuming attachment / detachment work, various attachment / detachment devices have been developed in which the drive shaft and the fan can be easily performed.
For example, a one-touch attachment / detachment device as described in Patent Document 2 (Patent 5298371, particularly paragraphs 0028 to 0036) has been developed. The one-touch attachment / detachment device of Patent Document 2 inserts a drive shaft having a tapered tip into the insertion hole of the operation lever of the attachment / detachment device at the time of attachment. At this time, the operation lever is guided by the tapered surface at the tip of the drive shaft, and when the operation lever reaches the locking groove (predetermined position) provided on the drive shaft, the operation lever that also serves as the drive shaft holding portion is driven. The drive shaft and fan are installed by being urged by the base end of the shaft.
As described above, among various devices having the tip shape of the drive shaft, in the conventional attachment / detachment device, the attachment / detachment device depends on the tip shape of the shaft, and the shaft tip shape has a specific shape. There was a problem that it could only be used for.

Japanese Unexamined Patent Publication No. 2000-283093 Japanese Patent No. 5298371

As for the tip shape of the drive shaft, as described above, a screw grooved one or a tapered one has been widely adopted, and in addition, there are various types such as a D type. Further, not only the shape but also the diameter of the drive shaft may be different. For example, even in the same range hood, the tip of the drive shaft that rotates the fan and the tip of the drive shaft that rotates the grease filter may have different diameters, and have been designed and developed respectively.
In this way, the tip shape of the drive shaft and the attachment / detachment device have been designed and developed in correspondence with each other, and the design cost has been increased. There has been a demand for a attachment / detachment device that can be used for general purposes even if the shape of the tip of the drive shaft is different.
The present invention has been made to solve the above-mentioned problems, and provides a detachable device that can be used for general purposes even when the shape of the shaft tip is different, and a range hood provided with the detachable device. The purpose.

The present invention is a detachable device 10 that detachably holds the drive shaft 20 and the rotating body 4, the holding portion 11 that holds the peripheral surface of the drive shaft 20 and puts it in the holding state, and releases the holding state. A lock member 14 having a release portion 12 that is operated to bring the holding release state into a holding release state, and a locking portion 141 that engages with the release portion 12 in the holding release state, and the lock member 14 toward the release portion 12. The urging portion 13 for urging and the common abutting portion 144 provided on the lock member 14 and with which the tip end portion of the drive shaft 20 abuts are provided, and in the holding release state, the engagement portion 141 and the release portion are provided. In the case where the engaged portion 124 provided in 12 is engaged to maintain the holding release state and shift from the holding release state to the holding state, after the tip portion comes into contact with the common contact portion 144. When the lock member 14 moves by a predetermined distance <b> against the urging of the urging portion 13, the engaging portion 141 and the engaged portion 124 are disengaged to be in the holding state. The common contact portion 144 is an attachment / detachment device characterized by having a plurality of contact portions (1441, 1442) corresponding to the tip portions of the drive shaft 20 having different shapes to solve the problem. Is.

Further, in order to further enhance versatility, in the attachment / detachment device 10, the predetermined distance <b> is configured to be constant even if the tip of the drive shaft 20 has a different shape.
As a result, the common contact portion 144 not only receives the tip portions of the drive shaft 20 having various shapes, but also always moves by a constant predetermined distance <b> regardless of the shape of the tip end of the drive shaft 20. , The engagement between the engagement portion 141 and the engagement portion 124 is disengaged, and the holding state can be obtained.

In order to further enhance versatility, in the attachment / detachment device 10, the rotating body 4 has a through hole through which the drive shaft 20 penetrates and a boss portion 40, and the boss portion 40 locks the drive shaft pin 205. The engaging portion 141 has a locking groove portion 401, and the engaging portion 141 has an engaging wall having a predetermined height <a>, and the distance from the locking groove portion 401 to the abutting portion (1441, 1442) in the holding state is set. The distance <c>, the distance from the position of the drive shaft pin 205 to the tip portion is defined as the distance <d>, the predetermined distance <b> is substantially equal to the predetermined height <a>, and the distance <a>. By setting c> to be substantially equal to the distance <d>, it has become possible to standardize parts.
That is, regardless of the shape of the tip of the drive shaft 20, the predetermined distance <b> is made substantially equal to the predetermined height <a> so that the engagement portion 141 and the engagement portion 124 can be reliably engaged with each other. Since it can be removed, it is no longer necessary to review the design of the member for each tip shape of the drive shaft 20.
Further, regardless of the tip shape of the drive shaft 20, the distance <c> is substantially equal to the distance <d> so that the drive can be reliably connected, and the design of the member is designed by the drive shaft 20. It is no longer necessary to review the design for each tip shape.

The tip of the drive shaft 20 has various shapes (tapered shape, screw shape), but is shared by having a plurality of contact portions (1441, 1442) corresponding to the tip of the drive shaft 20 having different shapes. The lock member 14 using the contact portion 144 can be used in common regardless of the shape of the tip portion, and can be held at a predetermined position of the drive shaft 20.
In this way, it has become possible to provide a highly versatile and stable attachment / detachment device while being able to standardize parts and reduce costs.
Further, in the range hood 1 for which drive shafts 20 having various tip shapes have already been developed, the above effects can be further utilized.

It is a drawing of the range hood of 1st Example which concerns on this invention. (A) Front view (B) Plan view (C) Bottom view (D) Right side view (E) Perspective view seen from the lower right (F) Perspective view seen from the upper right A perspective view of the range hood of the first embodiment according to the present invention as viewed from the lower right when the straightening vane is removed. Cross-sectional view of the range hood of the first embodiment according to the present invention (in the I-I cross section of FIG. 1A). External perspective view of the fan and motor provided with the attachment / detachment device External view of attachment / detachment device Exploded view of attachment / detachment device Enlarged view of the main part showing the relationship between the boss base and the holding part Side view of a drive shaft having a reduced diameter groove held by the first holding member and the second holding member Enlarged view of the release part Perspective view showing the structure of the inner surface of the first holding member Perspective view showing the engagement relationship between the first holding member and the releasing portion. Perspective view showing the positional relationship between the release portion, the lock member, and the pressing spring before the release portion is locked in the holding state. Perspective view showing the positional relationship between the release portion, the lock member, and the pressing spring when the release portion is locked in the holding release state. Perspective view showing the structure of the common contact portion of the lock member Cross-sectional view (including some external views) when a drive shaft with a thick tip is attached to the attachment / detachment device and held in a holding state. Cross-sectional view (including a part of the external view) when the drive shaft with a tapered tip is attached to the attachment / detachment device and held in the holding state. Cross-sectional view when a drive shaft with a screw-shaped tip is attached to the attachment / detachment device and held in a holding state

<Example>
The range hood 1 according to the present invention will be described. FIG. 1 is a regular hexagonal view (part) of the range hood 1 in this embodiment, and FIG. 2 is a perspective view seen from the lower right when the straightening vane 7 of the range hood 1 in the present embodiment is removed. Shows a cross-sectional view in the front-rear direction from the front side to the back side when the range hood is installed.

The range hood 1 of the present invention has a thin hood 2 having an upward concave inner panel 5 on the inner surface for collecting steam, oily smoke, and the like generated by cooking performed downward or in the surroundings. The hood 2 is connected to a blower box 3 connected to an exhaust duct (not shown) near the communication port 6 located at the rear of the upper part. The blower box 3 has a fan 4 which is a sirocco fan and generates an air flow inside. Therefore, when the fan 4 operates, the communication port 6 becomes a negative pressure, and the air below the inner surface panel 5 is sucked through the communication port 6 and discharged to the outside through the exhaust duct.

A disk-shaped grease filter 8 having a hole for passing air flow is provided in the communication port 6, and a drive shaft is inserted into the center of the disk of the grease filter 8 and mounted by the attachment / detachment device 10 to form a motor 81. It is connected.

The air below the inner panel 5 contains oil smoke or the like generated by cooking, and when the fan 4 operates, it exists in the communication port 6, that is, on the flow path of the air flow generated by the fan 4 and is a fan. It is sucked into the hole of the grease filter 8 located on the upstream side of No. 4 and passes through the hole. The grease filter 8 is rotatably provided by a motor 81, and when the range hood 1 operates (normal operation), the fan 4 generates an air flow and the motor 81 rotates the grease filter 8. When the grease filter 8 rotates, air passes through the holes, but oil collides with the surface of the grease filter 8. The range hood 1 collects oil contained in air by rotating the grease filter 8.

Since the attachment / detachment device 10 that connects the grease filter 8 and the drive shaft 20 is located directly above the straightening vane 7, when an operator removes the grease filter 8 from the drive shaft for cleaning or the like, the straightening vane 7 is first removed. After removing and exposing the grease filter 8 as shown in FIG. 2, the attachment / detachment device 10 of the present invention is operated.
The structure of the range hood of the present invention is shown as an example, and is not limited thereto.

FIG. 4 is an external perspective view of the fan 4 and the motor 9 provided with the attachment / detachment device. The motor 9 drives the fan 4 via the drive shaft 20. The fan 4 and the drive shaft 20 are attached by the attachment / detachment device 10 of the present invention. An operation unit 121 of the release unit protrudes from the side surface of the attachment / detachment device 10, and the fan 4 can be pulled out from the drive shaft 20 by pushing the operation unit 121. When the drive shaft 20 and the fan 4 are fastened to each other by using the attachment / detachment device 10, the driving force of the power device such as the motor 9 is transmitted to the fan 4.

(Detachable device)
FIG. 5 is an enlarged perspective view of the attachment / detachment device 10 of the fan 4. The operation unit 121 of the release unit 12 protrudes from the attachment / detachment device 10, and by pushing the operation unit 121, the holding unit urged so as to sandwich the drive shaft 20 is pushed open as described later, and the fan from the drive shaft 20. 4 can be removed with a single touch. The attachment / detachment device 10 is covered with a attachment / detachment device cover 30 that covers the attachment / detachment device 10 in order to prevent oil from adhering to parts such as a holding portion, which will be described later, and to hide each internal mechanism so that the attachment / detachment device 10 looks neat. The attachment / detachment device cover 30 is provided with a plurality of attachment / detachment device attachment holes 301 around it. It is configured so that it can be fixed to the fan 4 with a screw or the like using the attachment / detachment device mounting hole 301, and the attachment / detachment device 10 and the fan 4 are integrated by fixing.

(Members that make up the attachment / detachment device)
FIG. 6 is an exploded view of the attachment / detachment device 10. A boss fixing bracket 18 is provided on the motor side. Next, the boss base 17 is arranged on the boss fixing bracket 18. The attachment / detachment device mounting hole 301, the boss base mounting hole 171 and the fixing bracket mounting hole 181 are aligned and fixed to a boss portion (not shown) with screws or the like. As a result, the fan 4 and the attachment / detachment device 10 are integrated.

(Holding part)
See FIG. 6 again. A holding portion guide groove 172 is provided in the center of the boss base 17, and the first holding member 111 and the second holding member 112 are fitted therein.
The first holding member 111 and the second holding member 112 constituting the holding portion 11 are urged by the torsion spring 115 in the direction of being constantly closed (the direction of sandwiching the drive shaft 20).
A plate 15 is provided so that the first holding member 111 and the second holding member 112 fitted in the holding portion guide groove 172 of the boss base 17 do not come off, and are attached to the boss base 17 with screws using the plate mounting holes 152. There is.

FIG. 7 shows a state in which the first holding member 111 and the second holding member 112 are provided on the boss base 17. The boss base 17 is provided with a holding portion guide groove 172, and opening / closing guide portions 173 for guiding the opening / closing of both holding members (111, 112) are provided on both sides thereof. Both holding members (111, 112) are fitted in the holding portion guide groove 172. First open / close guided portions 1113 are provided on both sides of the first holding member 111. Further, on both sides of the second holding member 112, second opening / closing guided portions 1123 are similarly provided. Both holding members (111, 112) slide along the opening / closing guide portion 173 of the guide groove 172, so that both holding members (111, 112) move left and right.
When the attachment / detachment device 10 is attached, both holding members (111, 112) are held in the open holding release state as described later, the hole formed in the center is opened more, and the drive shaft 20 (not shown) is inserted. It will be. When the holding state is changed to the holding state, both holding members (111, 112) are closed, and the first drive shaft holding portion 1115 of the first holding member 111 and the second drive shaft holding portion 1125 of the second holding member 112 are driven. It abuts on the shaft 20.
The holding portion 11 is composed of a torsion spring (not shown) that abuts on the outside of the first holding member 111 and the second holding member 112, and both holding members (111, 112) are subjected to the urging force of the torsion spring 115. Holds the drive shaft 20 by sandwiching it.

As shown in FIG. 8, the portion where the first drive shaft holding portion 1115 and the second drive shaft holding portion 1125 of both holding members (111, 112) hold the drive shaft 20 is a reduced diameter portion 202. is there.

(Release part)
FIG. 9 is an enlarged view of the release unit 12. The release unit 12 is provided with an operation unit 121 for pushing the fan 4 when the operator pulls it out from the drive shaft 20. When the operation unit 121 is pushed, a pair of pressing portions 122 provided on both sides of the release portion 12 slide with both movement guide portions (1114) of the first holding member 111 and the second holding member 112 (not shown). It is configured to do.
In the middle of the release portion 12, an engaged portion 124 that engages with the lock member 14 described later is provided.

FIG. 10 is a perspective view seen from the side in order to explain the structure of the first holding member 111 in an easy-to-understand manner, and the movements of both holding members (111, 112) will be described together with FIGS. 7 and 9. In FIG. 10, the second holding member is not shown. The pressing portion 122 is in contact with the movement guide portion 1114 provided on the inner surface of the first holding member 111 (the same applies to the second holding member 112), and slides by pushing the operation portion 121 to hold both. The members (111, 112) open.

The movement of the holding portion 11 will be described more specifically. As shown in FIG. 9, pressing portions 122 are provided on both side surfaces of the release portion 12, and when the operation portion 121 is pressed, the movement guide portion on the inner surface of the first holding member 111 shown in FIG. The pressing portion 122 of the releasing portion 12 shown in 1114 and FIG. 9 slides as described above.
As a result, as shown in FIG. 7, the first holding member 111 is a torsion spring (not shown) along the opening / closing guide portions 173 provided on both sides of the holding portion guide groove 172 of the boss base 17. It slides against the pressing force, and the first holding member 111 is gradually pushed away from the drive shaft 20. The second holding member 112 also moves in the same direction as the first holding member 111.
In the first embodiment, both holding members (111, 112) are configured to move in a direction orthogonal to the moving direction of the release portion 12, but the moving directions of the first holding member 111 and the second holding member 112 are As appropriate, the directions shown in the examples are just one example.

FIG. 11 is a perspective view showing the engagement relationship between the first holding member 111 and the second holding member 112 and the releasing portion 12, and the drive shaft 20 is not shown for explanation. In this state, the fan 4 is mounted on the drive shaft 20, that is, the holding portion 11 including the torsion spring 115, the first holding member 111, and the second holding member 112 holds the drive shaft 20 in between. The state is illustrated.
A concave regulating portion 123 is provided at the end of the releasing portion 12, and when both sandwiching members (111, 112) sandwich the drive shaft 20, the first sandwiching member 111 is contained in the regulating portion 123. The engaging portion 1119 is inserted. When the operating portion 121 of the releasing portion 12 is pushed to release the pinching, the engaging portion 1119 is pulled out from the concave restricting portion 123. The same applies to the second holding member 112. Since there is the restricting portion 123, even if some kind of attempt to open both sandwiching members (111, 112) to the left or right occurs, the regulating portion engages with the engaging portion of both sandwiching members (111, 112). I can't open it because I'm doing it. Both holding members (111, 112) will not open unless the operation unit 121 is pushed and the release unit 12 is pushed in to move.
The release unit 12 has an operation unit 121 used when removing the fan 4 from the drive shaft 20. In the state where the fan 4 is mounted on the drive shaft 20 (both holding portions 111 and 112), the operating portion 121 protrudes from the attachment / detachment device 10 as shown in FIG. (See Fig. 5)

(Lock member and release part)
The lock member 14 has the following functions.
(1) Drive shaft holding state Centrifugal force generated by the rotation of the fan 4 when the fan 4 is mounted on the drive shaft 20 and the peripheral surface of the drive shaft 20 is held by the holding portion 11 of the attachment / detachment device 10 to be in the holding state. As a result, the release portion 12 is held in a state where it does not protrude out of the attachment / detachment device cover 30.
(2) Drive shaft holding release state In order to facilitate attachment / detachment of the fan 4 from the drive shaft 20, when the operation unit 121 of the release unit 12 is pushed in, the holding unit 11 is locked in the holding release state.

(Holding release state)
The explanation will be returned to FIG. 6, which is an exploded view of the attachment / detachment device 10. Although shown separately, the lock member 14 is provided in contact with the release portion 12. The lock member 14 is provided with a first engaging portion 141 (“engagement portion” of the present invention) and a second engaging portion 142 separately thereof, both of which engage with the releasing portion 12.
The engaged portion 124 provided in the release portion 12 of FIG. 9 will be engaged with the first engaging portion 141 or the second engaging portion 142 of the lock member 14 depending on the situation.
Further, the lock member 14 is not fixed to any member in the attachment / detachment device 10 and can move freely in the direction of the drive shaft 20, but an urging portion is provided on the lock member 14. Since a certain pressing spring 13 is in contact with the lock member 14 and always presses the lock member 14 toward the release portion 12, the lock member 14 does not move freely unless a force resisting the urging force of the pressing spring 13 is applied.

(Holding state)
FIG. 12 is a perspective view showing a state in which the lock member 14 is in contact with the release portion 12. The second engaging portion 142 of the lock member 14 and the engaged portion 124 of the releasing portion 12 are not engaged with each other, and there is a slight gap 146. When the fan is attached, the gap 146 disappears by moving the release portion 12 in the [movement direction of the release portion when the second engagement portion 142 and the engaged portion 124 are engaged] indicated by the arrow in FIG. The engaging portion 142 and the releasing portion 124 are in contact with each other.
When the fan 4 is attached to the drive shaft 20, the operation unit 121 of the release unit 12 is in a state of protruding from the attachment / detachment device cover 30, and receives a strong centrifugal force due to the rotation of the fan 4. By engaging the second engaging portion 142 of the lock member 14 with the engaged portion 124, the releasing portion 12 is prevented from popping out in the direction of the operating portion 121 due to centrifugal force.

(Movement from holding release state to holding state: at the time of removal)
Next, a step of removing the fan 4 from the drive shaft 20 will be described.
When removing the fan 4 from the drive shaft 20, in order to release the holding by the first holding member 111 and the second holding member 112, the operating portion 121 of the releasing portion 12 is pushed and indicated by an arrow in FIG. The release unit 12 is moved in the direction of movement of the release unit.
As shown in FIG. 11, the first holding member 111 and the second holding member 112 are constantly pressed in the direction of holding the drive shaft 20 by the torsion spring 115, and come into contact with both holding members (111, 112). The pressing portion 122 of the releasing portion 12 also receives the pressing force of the torsion spring 115. By pushing the release portion 12 against the pressing force of the torsion spring 115, both holding members (111, 112) are separated from the drive shaft 20.
At this time, as shown in FIG. 12, the upper surface of the release portion 12 and the sliding surface 143 of the lock member 14 slide, and the engaged portion 124 gradually moves in the direction of the first engaging portion 141.
Since the pressing spring 13 is provided on the locking member 14, the locking member 14 is always urged toward the release portion 12 (the [pressing spring urging direction] indicated by the arrow in the drawing. ] See direction).
When the meshed portion 124 reaches the end of the first engaging portion 141 while sliding, the lock member 14 is pushed down by the urging force of the pressing spring 13 and is deeply covered by the first engaging portion 141. The engaging portion 124 is pushed in and engaged with each other. Since the engagement between the first engagement portion 141 of the lock member 14 and the engagement portion 124 of the release portion 12 is continued while being pushed by the pressing spring 13, the release portion 12 cannot move due to the engagement and is locked. It will be in the state of being. FIG. 13 shows this state.
Since the release portion 12 is locked, the first holding member 111 and the second holding member 112 are also maintained (locked) away from the drive shaft 20 so that the fan 4 can be easily pulled out from the drive shaft 20. Become.

(Movement from holding release state to holding state: at the time of installation)
When the fan is mounted, both holding portions (111, 112) are locked by the lock member 14 in the holding released state as shown in FIG. 13, so that the fan 4 can be easily mounted on the drive shaft 20. The lock member 14 is provided with a common contact portion 144 that comes into contact with the drive shaft 20.

FIG. 14 is a perspective view of the lock member 14 as viewed from the side opposite to that of FIG. As shown in FIG. 14, the common contact portion 144 is provided with a first contact portion 1441 and a second contact portion 1442 composed of a plurality of steps, and the diameters of the tip portions of the drive shaft 20 are different. Even if it is, the tip portion can come into contact with any of the contact portions (1441, 1442). It is also shown that the height of the engagement wall of the first engagement portion 141 is <a>.

In the state of FIG. 13, when the drive shaft (not shown) is inserted into the attachment / detachment device 10 integrated with the fan 4, the drive shaft 20 comes into contact with the common contact portion 144 of the drive shaft 20 of the lock member 14. When the drive shaft 20 is continuously pushed while being in contact with the lock member 14, the lock member 14 which is not fixed to any member moves by a predetermined distance <b> against the urging force of the pressing spring 13.
On the other hand, the release portion 12 was fitted into the first holding member 111 and the second holding member 112 and could not move as shown in FIG. 11, and only the lock member 14 pushed the drive shaft 20. Sometimes move.

Assuming that the height of the engagement wall of the first engagement portion 141 (“engagement portion” of the present invention) is a predetermined <a>, in the first embodiment of the present invention, a predetermined distance <b> and a predetermined height <a> Are designed to be equal. Therefore, after the tip of the drive shaft 20 comes into contact with the common contact portion, the lock member 14 moves by a predetermined distance <b> against the urging of the urging portion (pressing spring 13), so that the engagement wall The release portion 12 that is disengaged from the engagement portion 124 at the height <a> can move.

In the torsion spring 115, the first holding member 111 and the second holding member 112 are constantly pressed in the direction of sandwiching the drive shaft 20, and when the engagement is released, both holding members (111, 112) are pressed by the drive shaft. It moves in the direction of holding the peripheral surface of 20. Along with this, the release portion 12 moves so that the pressing portion 122 of the release portion 12 that comes into contact with both holding members (111, 112) is pushed out as the both holding portions (111, 112) move.
After that, the second engaging portion 142 of the lock member 14 and the engaged portion 124 of the releasing portion 12 are engaged and slide until they stop. In this way, the mounting of the fan 4 on the drive shaft 20 is completed.

(Members that make up the drive mechanism)
As described above, the attachment / detachment device 10 is provided on one side of the boss fixing bracket 18 (the fan is not shown), but the boss portion is provided on the motor side of the other side of the boss fixing bracket 18 as shown in FIG. 40 is provided. When the fan 4 is attached to the drive shaft 20, the tip of the drive shaft 20 is inserted into the insertion hole provided in the center of the boss portion 40. A pair of drive shaft pins 205 are provided on the drive shaft 20, and are fitted into locking groove portions 401 provided on all sides of the boss portion 40.
Alignment is required to fit the drive shaft pin 205 into the locking groove 401, but the locking groove 401 is arranged at four locations with respect to the pair of drive shaft pins 205 and is inclined toward the locking groove 401. Since the surface is provided, even if the fitting position is slightly deviated, it can be easily fitted by being guided by the inclined surface.
By fitting the drive shaft pin 205 and the locking groove portion 401, the drive shaft 20 and the fan 4 are driven and connected.

(Relationship between drive shaft, shaft pin and contact part)
FIG. 15 is a cross-sectional view (including a partial external view) of a drive shaft 20 having a large diameter at the tip when the drive shaft 20 is attached to the attachment / detachment device 10 and held in a holding state.
The drive shaft pin 205 is fitted in the locking groove portions 401 provided on the four sides of the boss portion 40. As shown in the right figure of FIG. 15, in the holding state, the drive shaft 20 having a large diameter at the tip is in contact with the first contact portion 1441 of the common contact portion 144 provided in multiple stages. Nothing is in contact with the second contact portion 1442. The distance from the position of the drive shaft pin 205 to the tip of the drive shaft 20 in this holding state is defined as the distance <d>.
Further, the left figure of FIG. 15 does not show the drive shaft 20 in contact with the first contact portion 1441 for the sake of explanation. The tip of the drive shaft 20 is in contact with the first contact portion 1441 as shown in the right figure.
The distance <c> from the locking groove portion 401 of the boss portion 40 to the first contact portion 1441 with which the tip end portion of the drive shaft 20 abuts in the holding state is set.
In the holding state, the distance <c> is designed to be substantially equal to the distance <d>, so that the drive shaft pin 205 is securely fitted in the locking groove 401.

FIG. 16 is a cross-sectional view (partially including an external view) of a drive shaft 20 having a tapered tip portion attached to the attachment / detachment device 10 and held in a holding state. Since the tip of the drive shaft 20 has a tapered shape and a small diameter, it cannot contact the first contact portion 1441 of the common contact portion 144 and is in contact with the second contact portion 1442. In the holding state, the position of the drive shaft pin 20 is set so that the distance <c> is substantially equal to the distance <d>, so that the drive shaft pin 205 is securely fitted in the locking groove portion 401. ing.

FIG. 17 shows a case where the drive shaft 20 has a screw-shaped tip. The drive shaft 20 is attached to the attachment / detachment device 10 and is in a holding state. Since the diameter of the tip of the drive shaft 20 is small, the tip does not contact the first contact portion 1441 of the common contact portion 144, but contacts the second contact portion 1442.

As described above, the common contact portion 144 of the present invention can correspond to the shape of the tip portion of the drive shaft 20 having various shapes, and can cope with the change in the diameter of the tip portion. Since the parts can be standardized, it can contribute to cost reduction.

In the first embodiment, as described above, <a>, which is the height of the engagement wall of the first engagement portion 141 (“engagement portion” of the present invention) of the lock member 14, and the tip portion of the drive shaft 20 are shared contact portions. The distance <b> at which the lock member 14 moves against the urging of the urging portion (pressing spring 13) after abutting on 144 is designed to be equal. Even if the tip of the drive shaft 20 has a different shape, the shared contact portion 144 accepts it as described above. Therefore, as long as the drive shaft 20 moves by a distance <b>, the lock member 14 and the release portion 12 can be engaged with each other. It comes off.
That is, even if the tip of the drive shaft 20 has a different shape, the distance <b> is always constant.

(Aspects of other common contact parts)
The shape of the common contact portion 144 may be conical. If it is conical, it can correspond to the diameter of the tip of the drive shaft 20 steplessly.

(Aspect of rotating body)
In the embodiment, the rotating body is a sirocco fan. The fan 4 implemented by the range hood 1 may be of any type such as a sirocco fan, a turbo fan, and a propeller fan. Further, the direction of the drive shaft 20 may be any direction such as vertical, horizontal, and inclined. Further, the rotating body may be a grease filter 8.
In particular, when the motor 81 dedicated to the grease filter 8 is provided as shown in FIG. 3, the drive shaft for driving the grease filter 8 may have a smaller diameter than the drive shaft for driving the fan. If the attachment / detachment device using the common contact portion 144 of the present invention that can correspond to the tip portions of drive shafts having various diameters is adopted, the parts of the attachment / detachment device 10 of the grease filter 8 and the attachment / detachment device 10 of the fan 4 can be standardized. , Can contribute to cost reduction.
Furthermore, it can be applied to a rotating body used other than the range hood.

(Ambushing part that urges the lock member)
In the embodiment, the pressing spring 13 is used as the urging portion for urging the lock member 14, but any elastic body such as rubber can be applied as long as the lock member 14 can be urged.

1 Range hood 2 Hood 3 Blower box 4 Fan (rotating body)
5 Inner panel 6 Communication port 7 Rectifier plate 8 Grease filter 81 Grease filter motor 9 Fan motor 10 Detachable device

11 Holding part 111 1st holding member 1113 1st opening / closing guided part 1114 Release part movement guide part 1115 1st drive shaft holding part 112 2nd holding member 1123 2nd opening / closing guided part 1125 2nd drive shaft holding part 115 Torsion spring

12 Release part 121 Operation part 122 of release member Pressing part 124 Engagement part

13 Pressing spring (urging part)

14 Lock member 141 First engaging portion 142 Second engaging portion 143 Sliding surface

144 Shared contact part 1441 First contact part 1442 Second contact part

146 void

15 Plate 152 Plate mounting hole

17 Boss base 171 Boss base mounting hole 172 Holding part guide groove 173 Opening and closing guide part

18 Boss fixing bracket 181 Fixing bracket mounting hole

20 Drive shaft 205 Drive shaft pin 202 Reduced diameter

30 Detachable device cover 301 Detachable device mounting hole

40 Boss 401 Locking groove

Claims (4)

A detachable device that detachably holds the drive shaft and the rotating body.
A holding portion that holds the peripheral surface of the drive shaft and puts it in a holding state,
A release unit operated to release the holding state and bring it into the holding release state,
A lock member having an engaging portion that engages with the releasing portion in the holding release state,
An urging portion that urges the lock member toward the release portion, and
A common contact portion provided on the lock member and with which the tip end portion of the drive shaft abuts,
With
In the holding release state,
The engaging portion and the engaged portion provided on the releasing portion are engaged with each other to maintain the holding release state.
In the case of transitioning from the holding release state to the holding state
After the tip portion comes into contact with the common contact portion, the lock member moves a predetermined distance <b> against the urging of the urging portion, so that the engaging portion and the engaged portion are brought into contact with each other. The engagement is released and the holding state is reached.
The shared contact portion is a attachment / detachment device characterized by having a plurality of contact portions corresponding to the tip portions of the drive shaft having different shapes. The attachment / detachment device according to claim 1, wherein the predetermined distance <b> is constant even if the tip of the drive shaft has a different shape. The rotating body has a through hole through which the drive shaft penetrates and a boss portion.
The boss portion has a locking groove portion for locking the drive shaft pin.
The engaging portion has an engaging wall having a predetermined height <a>.
The distance from the locking groove portion to the contact portion in the holding state is defined as the distance <c>.
The distance from the position of the drive shaft pin to the tip is defined as the distance <d>.
The predetermined distance <b> is substantially equal to the predetermined height <a>.
The attachment / detachment device according to claims 1 to 2, wherein the distance <c> is substantially equal to the distance <d>. A range hood including the attachment / detachment device according to claims 1-3.