JPH0817755B2 - Electric vacuum cleaner - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric vacuum cleaner provided with a removable dust collecting filter and a safety device for preventing dust from flowing into an electric blower.

(Prior art) Conventionally, as a safety device to prevent the inflow of dust into the electric blower, when the dust collection filter is not attached, the dust collection chamber lid that opens and closes the dust collection winder insertion / removal opening of the main body case is closed. 2. Description of the Related Art An electric vacuum cleaner equipped with a filter attachment detection device that prevents operation and prevents forgetting to attach a dust collection filter is known. It should be noted that this filter attachment detection device generally has an actuating member that is biased in a fixed direction. When the dust collection filter is not attached, the operating body is in a position where it comes into contact with the dust collection chamber lid before the dust collection chamber lid is completely closed.When the dust collection filter is attached, the dust collection filter is pressed by the dust collection filter. As a result, the operating body is moved to a position where it does not come into contact with the dust collecting chamber cover, and it is apparent that it is abnormal when the dust collecting filter is not attached.

However, in the conventional electric vacuum cleaner of this type, the electric blower has a structure capable of being driven regardless of whether the dust collecting chamber cover is closed or opened. That is,
You can drive the electric blower even if you forget to attach the dust collection filter and the dust collection chamber lid is not completely closed.
At that time, since dust is sucked in without passing through the dust collecting filter, it may deteriorate the performance of the electric blower inside the main body case, and in particularly severe cases, the main body case may be deformed due to burning due to the lock of the electric blower. May be invited.

In addition, Japanese Utility Model Laid-Open No. 60-94152 or Japanese Utility Model Laid-Open No. 62-117.
As described in Japanese Patent Publication No. 950, for example, there is known an electric vacuum cleaner provided with a shutter body for opening and closing a suction port provided in a dust collection chamber lid. Alternatively, it has various structures such as a side-opening one.

(Problems to be Solved by the Invention) As described above, in the conventional vacuum cleaner provided with the filter device detection device that prevents the closing operation of the dust collecting chamber lid when the dust collecting filter is not attached, the dust collecting chamber lid is Since the electric blower can be driven even when the door is open, there is a problem that dust may flow into the electric blower.

Therefore, for example, as shown in FIG. 11 or FIGS. 12 and 13, it is conceivable that the electric blower can be driven only when the dust collecting chamber lid is completely closed.

In FIG. 11, reference numeral 1 denotes a main body case. Inside the main body case 1, an electric blower (not shown) is provided, and a dust collecting chamber 2 that is open upward and is equipped with a dust collecting filter (not shown). Are formed. Also,
Reference numeral 3 denotes a dust collecting chamber cover, and this dust collecting chamber cover 3 is pivotally attached to the main body case 1 at the rear end portion of the main body case 1 on the right side in the drawing, and covers the dust collecting chamber 2 so as to be openable and closable. It is a thing. Further, 4 is a locking device, which locks the dust collecting chamber lid 3
Is pivotally attached to the front end of the support shaft 5 by a support shaft 5 and a spring 6
Is always urged in the counterclockwise direction in the figure by the engaging portion 7 at the lower end to be detachably engaged with the engaged portion 8 formed in the main body case 1 so that the dust collecting chamber lid 3 is closed. It is to be kept in a closed state. A contact 9 on the main body side is fixed to the upper side of the front end of the main body case 1. On the other hand, on the lower side of the front end of the dust collecting chamber cover 3, the contact 9 on the main body side faces the dust collecting chamber cover 3. The leaf spring-like contact 10 on the lid side is in contact with the contact 9 on the main body side only when is closed. A lead wire 11 connected to the contact 9 on the main body side penetrates the main body case 1, and a packing 12 is provided in the penetrating portion. Electrically, the electric blower can be driven when the contacts 9 and 10 are in contact with each other, and the electric blower cannot be driven when the contacts 9 and 10 are separated from each other.

Further, in the electric vacuum cleaner shown in FIGS. 12 and 13, a leaf spring-shaped main body side contact 9 is provided on the engaged portion 8 of the main body case 1, while the engagement of the locking device 4 is performed. A plate-shaped cover-side contact 10 is provided at the tip of the portion 7. The contacts 9 and 10 contact each other when and only when the engaging portion 7 of the locking device 4 is engaged with the engaged portion 8. Even if the locking device 4 is provided on the body case 1 side, the same structure can be adopted. Thus, the dust collecting chamber cover 3 and the main body case 1
The locking device 4 for locking the and
By providing 10, the dust collection chamber lid 3 can be driven more reliably only when the dust collection chamber lid 3 is completely closed, and the connection between the dust collection chamber lid 3 and the main body case 1 can be made more reliable and strong. .

However, in any of the structures described above, since the contacts 9 and 10 are both exposed, there is a problem that contact failure is likely to occur due to dust adhering to the contacts 9 and 10, and a risk of electric shock may occur. is there.

The present invention is intended to solve such a problem, and includes a contact failure of a switch contact and an electric shock that can drive the electric blower only when the dust collection chamber lid is closed with the filter attachment detection device. The purpose is to prevent danger. It is also an object of the present invention to further reduce the risk of contact failure and electric shock, and to further enhance the function as a safety device that prevents dust from flowing into the electric blower.

(Means for Solving the Problems) An electric vacuum cleaner according to claim 1, wherein an electric blower and a dust collection chamber communicating with the electric blower are provided inside and an opening is provided facing the dust collection chamber. And a dust collection chamber lid that has a suction port that communicates the dust collection chamber to the outside and that opens and closes the opening so that the opening can be opened and closed slidably supported by the dust collection chamber lid. Shutter body, a dust collecting filter that is detachably mounted in the dust collecting chamber through the opening, and a filter device that prevents the closing operation of the dust collecting chamber cover when the dust collecting filter is not mounted The main body case is provided with a detecting device, and the main body case has a concave portion into which the shutter body is inserted when the shutter body is opened in a state where the dust collecting chamber lid is closed, and a non-insertion state of the shutter body provided in the concave portion. Can be opened and closed by insertion The electric blower cannot be driven when the shutter body is not inserted into the recess and the contact is open, and the shutter body is inserted into the recess to close the contact. Sometimes, it is provided with a normally open type switch that can drive the electric blower.

The vacuum cleaner according to claim 2 is the vacuum cleaner according to claim 1, wherein the main body is detachably engaged with an engaged portion of a main body case movably provided on the dust collecting chamber lid. A locking device for holding the dust collecting chamber lid in a closed state with respect to the case is provided, and the entrance and exit of the recess into which the shutter body is inserted is opened and closed in conjunction with the locking device, and the locking device is the main body case. The concave lid for opening the entrance is provided only when it is completely engaged with the engaged portion.

(Operation) In the electric vacuum cleaner according to claim 1, the dust collecting chamber lid is opened to open the opening of the main body case facing the dust collecting chamber, and the dust collecting filter is mounted in the dust collecting chamber through the opening. In the state,
The filter attachment detection device does not interfere with the closing operation of the dust collecting chamber lid, and the dust collecting chamber lid is closed. On the other hand, when the dust collection filter is not attached, the filter attachment detection device hinders the closing operation of the dust collection chamber lid, and the dust collection chamber lid is not completely closed. Also,
At the time of cleaning, with the dust-collecting chamber lid closed, open the shutter body that closes the suction port of the dust-collecting chamber lid, and open the suction port, so that the shutter body is inserted into the recess of the main body case, The pair of contacts of the normally open type switch arranged in this recess are closed, and the electric blower can be driven. On the other hand, in other states, that is, in the state where the dust collecting chamber lid is open or the shutter body is closed and is not inserted into the recess, the normally open switch is opened and the electric blower cannot be driven.

The vacuum cleaner according to claim 2 is the vacuum cleaner according to claim 1, wherein a locking device provided movably on the dust collecting chamber lid is engaged with an engaged portion of the main body case to collect the dust collecting chamber. While holding the lid closed, when opening the dust chamber lid, the locking device is disengaged from the engaged portion of the body case. Then, when the locking device is completely engaged with the engaged portion of the main body case,
When the locking device is not engaged with the main body case, the recess cover allows the shutter body to be inserted into the recess by opening the entrance of the recess in conjunction with the locking device. The door is closed and the shutter body cannot be inserted into the recess, and the contact of the normally open switch is not closed.

(Embodiment) Hereinafter, the configuration of an embodiment of the vacuum cleaner of the present invention will be described with reference to FIG. 1 to FIG.

In FIG. 1 and FIG. 2, reference numeral 21 denotes a cleaner body, and the cleaner body 21 has a body case 23 having an opening 22 formed on an upper front side thereof, and the opening 22 of the body case 23 can be freely opened and closed. The dust collection chamber cover 24 is closed. Further, the main body case 23 is composed of a lower main body case member 25 and an upper main body case member 26 coupled and fixed to the upper side of the lower main body case member 25. Further, the lower body case member 25,
A swivel wheel 27 is rotatably provided on the front side of the lower surface, and a rear wheel 28 is pivotally mounted on the lower rear sides of both side surfaces. A front handle 29 is integrally provided at the front end of the main body case 23, and an upper handle 30 is provided at the center of the upper surface.
Is pivotally attached.

Then, the inside of the main body case 23 is divided into front and rear by a partition wall 32 formed in a substantially central portion thereof and having a communication port 31, and an electric blower 33 is provided in a space portion behind the partition wall 32.
Is provided, and a space portion in front of the partition wall 32 serves as a dust collection chamber 34 having the opening 22 on the upper surface and located on the negative pressure side of the electric blower 33. An exhaust port 35 communicating with the positive pressure side of the electric blower 33 is formed on the rear surface of the main body case 23. A sponge-like exhaust filter 36 is mounted inside the main body case 23 so as to cover the exhaust port 35. In addition, inside the body case 23, an electric blower 33
A cord reel 38, which is located at the rear of the cord and which houses a power cord 37 connected to an AC power source, is rotatably provided. Further, on the rear side of the upper surface of the main body case 23, a cord reel button 39 for operating the cord reel 38 is provided.

On the other hand, the dust-collecting chamber lid 24 is formed in a thin box shape with an open lower surface, and is pivotally attached to the body case 23 by a support shaft 41 at the rear end thereof so as to be vertically rotatable. Further, a locking device 43 biased clockwise in the drawing by a spring 42 is pivotally attached to a tip end portion of the dust collecting chamber cover 24 by a support shaft 44.
An engaging portion 45 formed so as to project rearward from the lower end of the locking device 43 is detachably engaged with an engaged portion 46 formed at the upper end of the front surface of the main body case 23, and The dust chamber lid 24 is kept closed.

The front side of the upper surface of the dust collecting chamber lid 24 is formed with an inclined surface 51 that descends toward the front, and the inclined surface 51 is formed with a circular upper opening 52. Further, on the lower surface side of the dust collecting chamber lid 24, an inner wall is formed substantially parallel to the upper surface of the dust collecting chamber lid 24.
53 is coupled and fixed by a screw or the like, and a lower opening 54 facing the upper opening 52 is formed in the inner wall 53.
Further, in the space between the inclined surface 51 and the inner wall 53, the support 55
Is fixed, and the support 55 is formed with an intermediate opening 56 facing the upper opening 52 and the lower opening 54.

On the other hand, 57 is a rotating body, and the rotating body 57 is positioned between the inclined surface 51 and the inner wall 53 and is rotatably supported by the support body 55. That is, the rotating body 57 includes an upper rotating body member 58 and a lower rotating body member, which are substantially disc-shaped and fixed together by screws.
The upper rotary member member 58 and the lower rotary member member 59 are rotatably and slidably sandwiched at the peripheral portions of the intermediate opening 56 of the support body 55.

A cylindrical suction port 61 that faces the upper opening 52 of the dust collection chamber cover 24 is formed on the upper rotary member 58 so as to project downward. On the other hand, on the cylindrical lower rotating body member 59, a cylindrical tubular portion 62 facing the suction port 61 and the lower opening 54 of the dust collection chamber lid 24 is formed so as to project downward.

Further, an openable / closable inlet valve body 63 is airtightly mounted between the inlet 61 and the tubular portion 62. Also, the dust collection chamber lid 24
A seal packing 64 is attached to the peripheral portion of the lower opening 54, and the tip of the tubular portion 62 is hermetically and slidably pressed against the seal packing 64.

In addition, on the bottom surface of the rotating body 57, a pair of ring-shaped contacts 66, 6
6 is fixed. Further, the pair of receiving contacts 67, 6 shown in FIG. 7 are provided in the rotating body 57 so as to face the pair of insertion holes (not shown) formed on the upper surface of the upper rotating body member 58, respectively.
7 is fixed. And these receiving contacts 67,67
Are electrically connected to the ring-shaped contacts 66, 66 via lead wires (not shown), respectively. The ring-shaped contacts 66, 66 are slidably contacted with a pair of fixed contacts 69, 69 fixed to the inner wall 53 with screws 68. One fixed contact 69 is electrically connected to a control circuit 71 of the electric blower 33 shown in FIG. 7 provided in the main body case 23 via a lead wire (not shown). The other fixed contact 69 is electrically connected via a lead wire 73 to a leaf spring-shaped contact 72 on the lid body fixed to the front end of the upper surface of the inner wall 53. The free end side projects forward and downward from a gap 74 between the front end of the inner wall 53 and the lower end of the locking device 43.

On the other hand, a partition wall 75 is formed in the main body case 23 so as to face the front surface from the rear, and a front and rear entrance 76 that faces the gap 74 from below is provided on the upper surface. It has a groove-shaped recess 77. And this recess
A plate-shaped main body side contact 78, to which the lid side contact 72 comes in contact with the front side so that it can freely come into contact with and separate from the front side, is fixed to the upper part of the rear surface inside 77, and this main body side contact 78 leads to the control circuit 71. It is electrically connected through 79. And the contact 72 on the lid side
And the contact 78 on the main body side constitute a normally open switch 80.

A seal packing 81 with which the inner wall 53 is airtightly contacted is provided on the peripheral edge of the opening 22 of the main body case 23 including the upper edge of the partition wall 75.

Further, between the inclined surface 51 of the dust collecting chamber lid 24 and the rotating body 57, a flexible and substantially rectangular shutter body 86 that closes the upper opening 52 so as to be opened and closed is slidably supported. There is. The shutter body 86 has a knob 87 at the rear end, and is opened by sliding to the side opposite to the support shaft 41 of the dust collection chamber lid 24, that is, the front side, and the front end of the lower surface of the dust collection chamber lid 24. Part and upper rotating body member 58
A gap 88 between the upper surface of the support 55 and the upper surface of the support 55 is slidably inserted. Then, a part of the shutter body 86 is provided with the inner wall 53 and the locking device when the dust collecting chamber cover 24 is opened in a closed state.
It is removably inserted into the recess 77 of the main body case 23 through the gap 74 between the 43 and the doorway 76, and the contact 72 on the lid side is pressed from the front to come into contact with the contact 78 on the main body side. There is. A guide portion 89 is formed on the front surface and the rear surface of the recess 77 so as to sandwich the shutter body 86 and regulate its position.

On the other hand, 91 is a dust collecting filter made of paper or the like, and this dust collecting filter 91 includes a bag-shaped filter member 92 and a dust collecting port 93 provided on the opening side of the filter member 92 and facing the suction port 61. It has a mouth frame 94. The dust collecting filter 91 is detachably mounted in the dust collecting chamber 34 and is put in and out through the opening 22 of the dust collecting chamber 34.

In addition, in the dust collection chamber 34 of the main body case 23, the dust collection chamber lid 24
A substantially U-shaped holding plate 96, which is opposed to the inner wall 53 with a small gap therebetween, is pivotally mounted by a support shaft 97. This holding plate 96
As shown in FIGS. 5 and 6, a pair of upper and lower holding ribs 98 for detachably holding the peripheral portion of the mouth frame 94 of the dust collecting filter 91 are formed on the inner surface of the mouth frame 94. A filter device detection device 101 for preventing the closing operation of the dust collection chamber cover pair 24 when the filter is not attached is provided. The filter attachment detection device 101 is composed of an actuating body 102 that is slidable left and right. The actuating body 102 is located in the vicinity of a holding rib 98 and a detecting portion 103 that presses the mouth frame 94 from the side, and a holding portion. Board 96
And a restricting portion 102 protruding upward from a through hole 104 formed in the upper surface portion of the. The actuating body 102 is constantly urged by a spring (not shown) in the left direction in the drawing, that is, in the direction in which the detection unit 103 projects.

On the other hand, on the lower surface of the inner wall 53 of the dust collecting chamber lid 24, the regulating portion 105
Is located on the left side as shown in FIG. 5, the dust collection chamber cover 24 comes into contact with the regulating portion 105 from above before the lid 24 is completely closed, and as shown in FIG. The receiving rib 106 is formed so as not to abut when it is located at.

Further, 111 is a hose, and this hose 111 is a bellows-shaped and bendable hose body 112, and a tip end thereof is detachably inserted into a suction port 61 of a cleaner body 21 provided at one end of the hose body 112. The hose body 112 includes a bent cylindrical connection pipe 113 to be attached and a grip pipe (not shown) provided at the other end of the hose body 112. The connecting portion between the hose body 112 and the connecting pipe 113 is covered with a cover body 114 whose lower end is fitted into the upper opening 52 of the dust collecting chamber lid 24. Also, the cover body 114
On the lower surface of the pair of transmission side contacts 115, 115 shown in FIG.
Are laid vertically, and these transmitting contacts 115, 115 are connected to the hose 1
It is electrically connected to a hand-operated operation section provided on the grip tube through a signal line provided in the inside.

Next, a control circuit 71 that variably controls the input of the electric blower 33.
The configuration will be described with reference to FIG.

A triac 12 in which a snubber circuit as a protection circuit including a fuse 121, a resistor 122, and a capacitor 123 is connected to both electrodes of a power cord 37 connected to a commercial AC power source.
4, electric blower 33 is connected in series, this electric blower 33
Has a noise prevention circuit 125 including a capacitor.

A primary winding of the step-down transformer 126 is connected to the power cord 37, and a rectifier circuit 127 including a diode bridge is connected to the secondary winding of the transformer 126, and an output side of the rectifier circuit 127 is connected. Resistor 128 and Zener diode
A constant voltage circuit consisting of 129 is connected. Then, the resistor 1 connected in series with the Zener diode 129 in parallel.
30 and the resistor 131 are connected, the gate of the programmable unijunction transistor (PUT) 132 is connected to the connection point of the resistor 130 and the resistor 131, and the cathode of the PUT 132 is connected to one end of the primary winding of the transformer 133. It is connected. A charging capacitor 134 is connected between the anode of the PUT 132 and the other end of the primary winding of the transformer 133. Further, a resistor 135 and a diode 136 are connected to the secondary winding of the transformer 133 and are connected to the gate of the triac 124.

The connection point of the resistors 128 and 130 is the receiving contact 67 on one side.
The resistor 137 connected to the PUT 132 is connected to the other receiving side contact 67 via the normally open switch 80. In addition, the pair of transmitting contacts 115,115 of the hose 111.
A variable resistor 138, which also functions as a switch of the hand operation unit of the hose 111, is connected between them.

 Next, the operation of the above embodiment will be described.

When installing the dust collecting filter 91, first of all, the locking device.
43 is operated to engage the engaging portion 45 with the engaged portion 46 of the main body case 23.
While removing the dust collection chamber lid, the dust collection chamber lid 24 is rotated upward to open, and the opening 22 of the dust collection chamber 34 is opened. Next, the holding plate 96 is rotated to stand up, and as shown in FIG. 6, the mouth frame 94 of the dust collecting filter 91 is inserted from above between the holding ribs 98 of the holding plate 96, and then the holding plate 96 is placed. knock down. When the mouth frame 94 is thus inserted, the side edge of the mouth frame 94 presses the detection portion 103 of the actuation body 102, and the actuation body 102 moves to the right in the figure against the biasing force of the spring. Next, the dust collection chamber cover 24 is rotated downward to close, and the engaging portion 45 of the locking device 43 is engaged with the engaged portion 46 of the main body case 23.
To be engaged. At this time, as described above, since the regulating portion 105 of the actuating body 102 is located to the right, the receiving rib 106 on the dust collecting chamber lid 24 side does not contact the regulating portion 105, and the dust collecting The closing operation of the chamber lid 24 is not hindered. Further, when the dust collection chamber lid 24 is closed, the seal packing 64 near the suction port 61 is airtightly contacted with the periphery of the dust collection port 93 of the mouth frame 94 of the dust collection filter 91 and the main body case. The seal packing 81 on the peripheral edge of the opening 22 of 24 is brought into airtight contact with the inner wall 53 of the dust collecting chamber lid 24.

On the other hand, with the dust collection filter 91 not attached, the dust collection chamber lid
When closing 24, as shown in FIG. 5, the regulating portion 105 of the actuating body 102 is located on the left side in the figure by the urging force of the spring, so that before the dust collecting chamber lid 24 is completely closed. Receiving rib 10
6 comes into contact with the regulating portion 105 from above, the closing operation of the dust collection chamber lid 24 is hindered, and a certain gap remains between the dust collection chamber lid 24 and the main body case 23. This allows the user to
It is possible to know that the user has forgotten to attach the dust collecting filter 91.

Then, in the state where the dust collecting chamber cover 24 is closed and the shutter body 86 is closed, as shown in FIG.
72 is located in the recess 77 of the body case 23 and faces the contact 78 on the body side with a slight distance from the front. On the other hand, as described above, the filter attachment detection device 101 causes the dust collection chamber lid 24
When the dust collection chamber cover 24 is not closed, including when the closing operation of the cover is blocked, the contact 72 on the cover side is located above the contact 78 on the body side.

In addition, at the time of cleaning, the shutter body that closed the suction port 61 of the dust collection chamber cover 24 with the dust collection chamber cover 24 closed.
Slide 86 forward to open and open suction port 61. Then, as shown in FIG. 4, the shutter body 86 descends and is inserted into the recess 77 of the main body case 23 from the entrance 76. Further, as shown in FIG. 2, the shutter body 86 is
The contact 72 on the lid side is pressed from the front through the front and rear guide parts 89 to elastically deform and contact the contact 78 on the body side, and the normally open switch 80 is closed. And as long as the shutter body 86 is open, this shutter body 86 is the contact 72 on the lid side.
Is continuously pressed, and the normally open type switch 80 is held in the closed state.

Further, the connection pipe 113 of the hose 111 is inserted into the opened suction port 61, and the suction port body is connected to the grip pipe of the hose 111 via, for example, an extension pipe.

Then, the user holds the grip tube and operates the hand operation section to control the electric blower 33 to perform cleaning. By driving the electric blower 33, the dust sucked together with the airflow from the suction port body is guided to the dust collecting chamber 34 of the cleaner body 21 through the extension pipe and the hose 111, and is trapped in the dust collecting filter 91. . Then, the airflow from which dust has been removed through the dust collecting filter 91 flows into the electric blower 33.

In addition, the user can adjust the variable resistance 1 of the hand operation part of the hose 111.
By operating 38, the input of the electric blower 33 can be adjusted and the suction force can be adjusted. The control of the electric blower 33 is performed by the control circuit 71. Here, the control circuit 71
The operation of will be described.

Increasing the resistance value of the variable resistor 138 increases the capacitance of the capacitor 134.
Charging time becomes longer, the PUT132 turn-on time is delayed when the anode potential exceeds the gate voltage set by the resistors 130 and 131, and the trigger phase control angle of the triac 124 becomes larger. , Electric blower 3
The power supplied to 3 decreases, and the input of the electric blower 33 decreases. On the other hand, when the resistance value of the variable resistor 138 becomes smaller, the charging time of the capacitor 134 becomes shorter, so the trigger phase control angle of the triac 124 becomes smaller and the electric blower 3
3 inputs increase. Further, if the switch that the variable resistor 138 also serves as is opened, the electric blower 33 stops. Therefore, the normal type switch 8 connected in series with the variable resistor 138
The electric blower 33 can be driven only when 0 is closed, and the electric blower 33 cannot be driven when the normally open switch 80 is open.

Also, after cleaning, connect the suction tube 61 to the connection tube 1 of the hose 111.
13 is removed, the shutter body 86 is slid backward and closed, and the suction port 61 is closed. When the shutter body 86 is closed, the shutter body 86 separates from the contact 72 on the lid side, the contact 72 on the lid body separates from the contact 78 on the main body side by its elasticity, and the normally open switch 80 opens.

Further, when a large amount of dust is collected in the dust collecting filter 91, the dust collecting chamber lid 24 is opened, the holding plate 96 is erected, and the mouth frame 94 is pulled out from between the holding ribs 98 of the holding plate 96 to remove the dust collecting filter 91. Remove and attach a new dust collection filter 91.

As is clear from the above description, the normally open type switch 80 is not closed and the electric blower 33 cannot be driven unless the dust collection chamber cover 24 is completely closed and the shutter body 86 is opened. For example, even if the dust collecting filter 91 is not mounted and the shutter body 86 is opened while the filter mounting detection device 101 prevents the closing operation of the dust collecting chamber lid body 24, the contact 72 on the lid body side does not contact the main body side. The contacts 72 and 78 do not come into contact with each other because they are displaced upward from the contact 78 of.

Therefore, unless the dust collecting filter 91 is attached or the dust collecting chamber cover 24 is not completely closed, the electric blower 33 does not drive, does not pass through the dust collecting filter 91, and is directly attached to the electric blower 33. Dust will not flow in. For this reason, it is possible to prevent the electric blower 33 from being locked due to foreign matter entering the electric blower 33, which is safe, the electric blower 33 is not greatly adversely affected, the life of the electric blower 33 is extended, and the suction is also reduced. The work rate will not decrease.

By the way, in the above embodiment, the variable resistor 138 with a switch for operating the electric blower 33 is provided in the hose 111, but the switch for operating the electric blower 33 may be provided in the cleaner body 21. Particularly in this case, the fact that the electric blower 33 is not driven with the shutter body 86 closed brings about an effect that the electric blower 33 is not overloaded.

Further, the contact 78 on the main body side is in the recess 77 of the main body case 23 and is not exposed even when the dust collecting vertebral cover 24 is opened, so that dust is unlikely to adhere to the contact 78 on the main body side and poor contact is unlikely to occur. At the same time, the contacts 72 and 78 are not easily short-circuited, and further, electric shock can be prevented, which is safe.

Although the lid-side contact 72 is provided on the inner wall 53 in the above-described embodiment, the lid-side contact 72 may be provided on the shutter body 86 or the like.

Further, it is possible to dispose a pair of contacts forming a normally open type switch corresponding to the normally open type switch 80 of FIG. 7 in the recess 77 of the main body case 23. However, in the case of adopting this structure, the switch is depressed by the concave portion 77 so that the switch is operated and closed by the shutter body 86 only when the dust collecting chamber lid body 24 is completely closed and the shutter body 86 is completely opened. Must be placed underneath.

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

Although not shown in the embodiment shown in FIGS. 8 to 10, a pair of contacts forming a switch corresponding to the normally open switch 80 of FIG.
It is arranged inside.

Further, the main body case 23 supports a recess cover 141 that opens and closes in the vicinity of the entrance / exit 76 of the recess 77, that is, at a position outside the contact point so as to be slidable back and forth within a certain range. This recess lid 141
Are fitted and supported in, for example, the groove portions 142 formed in the partition wall 75. Then, the recess lid 141 is provided with a spring 143.
Is always urged forward, that is, in the direction of closing the entrance 76 of the recess 77. Further, the concave lid 141 is the main body case 23.
Of the locking device 43 located near the engaged portion 46 of the
When 45 is pressed from the front, it slides backward. Further, in the center of the front part of the recess lid 141,
A notch 144 through which the shutter body 86 is inserted is formed.

In the state where the engaging portion 45 of the locking device 43 is not completely engaged with the engaged portion 46, including the time when the dust collecting chamber cover 24 is open, as shown in FIG. The recess lid body 141 is located in the front and closes the upper position of the recess 77. Therefore, in this state, the shutter body 86 is also not inserted below the recess cover body 141 and does not reach the contact point.

On the other hand, as shown in FIG. 9, when the engaging portion 45 is engaged with the engaged portion 46, the engaging portion 45 presses the recess lid body 141, and the recess lid body 141 retreats, The notch 144 of the recess lid 141
However, it is located facing the entrance / exit 76 of the recess 77, and a part of the entrance / exit 76 is opened. And in this state, the shutter body 86
When the shutter is opened, the shutter body 86 becomes the cutout portion 1 of the concave lid body 141.
After passing through 44, it is inserted into the concave portion 777, the switch is closed in contact with the contact, and the electric blower 33 can be driven.

Even if the dust collecting chamber lid 24 is opened with the shutter body 86 open, the shutter body 86 is pressed by the recess lid body 141 urged by the spring 143.
Can't open. That is, the dust collecting chamber lid 24 cannot be opened unless the shutter body 86 is closed.

According to the above configuration, when the dust-collecting chamber lid 24 is opened, the entrance / exit 76 of the recess 77 containing the contact is closed by the recess lid 141, so that the risk of poor contact, short circuit, electric shock, etc. is further reduced. To do. Further, since the shutter body 86 is not inserted into the recess 77 unless the dust collecting chamber lid 24 is closed, the dust collecting filter 91 is not attached or the dust collecting chamber lid body is attached.
This is more reliable than prevention of driving of the electric blower 33 when the 24 is not closed.

(Effect of the invention) According to the electric vacuum cleaner of claim 1, in addition to the filter attachment detection device that prevents the closing operation of the dust collection chamber lid when the dust collection filter is not attached, the dust collection chamber lid is closed. Since the normally open switch that allows the electric blower to be driven by closing the contact by operating the shutter body only when the shutter body of the suction port is opened and inserted into the recess of the main body case, a dust collection filter is installed. If it is not closed or the dust collection chamber lid is not closed, the electric blower is not driven, dust can be reliably prevented from flowing into the electric blower, the electric blower can be prevented from locking, and the deterioration and suction work of the electric blower can be prevented. The decrease in the rate can be prevented. Moreover, since the normally open type switch is arranged in the recess of the main body case and is not exposed when the dust collecting chamber cover is opened, dust is unlikely to adhere to the pair of contacts of the normally open type switch and contact failure is less likely to occur. Also, careless short circuit or electric shock can be prevented.

According to the electric vacuum cleaner of claim 2, in addition to the electric vacuum cleaner of claim 1, the locking device interlocks with a locking device that holds the dust chamber lid in a closed state, and the locking device covers the main body case. Since the recess lid opens the entrance of the recess only when it is engaged with the engaging part,
The risk of contact failure, short circuit, electric shock, etc. can be further reduced, and the shutter body is not inserted into the recess unless the dust collection chamber lid is closed, and the dust collection filter is not attached or the dust collection chamber lid is The drive of the electric blower in the unclosed state can be reliably prevented.

[Brief description of drawings]

FIG. 1 is a sectional view of an electric vacuum cleaner according to an embodiment of the present invention with a shutter body closed, FIG. 2 is a sectional view of a front portion of the electric vacuum cleaner with the shutter body opened, and FIG. Sectional view around the switch when the dust chamber lid is open, FIG. 4 is a sectional view near the switch when the shutter body is in the middle of opening,
FIG. 5 is a perspective view of the same holding body without a dust collecting filter attached, FIG. 6 is a perspective view of the same holding body with a dust collecting filter attached, and FIG. 7 is an electric circuit diagram of the same as above. FIG. 9 is a sectional view of the vicinity of a recessed cover before engagement of a locking device showing another embodiment of the present invention, and FIG. The figure is the same as above
FIG. 11 is a cross-sectional view showing an example of an electric vacuum cleaner that is considered to have the same purpose as the present invention, and FIG. 12 is another example of an electric vacuum cleaner that is considered to have the same purpose as the present invention. FIG. 13 is a sectional view of the vicinity of the contact point shown in FIG. 22 …… Aperture, 23 …… Main body case, 24 …… Dust collection chamber lid,
33: Electric blower, 34: Dust collection chamber, 43: Locking device, 46
...... Engaged part, 61 …… Suction port, 72 …… Contact on the lid side, 76
…… Gateway, 77 …… Concave, 78 …… Contact point on the main unit side, 80 ……
Normally open type switch, 86 ... Shutter body, 91 ... Dust collection filter, 101 ... Filter mounting detection device, 141 ... Recessed lid body.

Claims (2)

[Claims] 1. A main body case having an electric blower and a dust collection chamber communicating with the electric blower inside and having an opening facing the dust collection chamber, and a suction port for communicating the dust collection chamber to the outside. A dust collection chamber lid body that has the opening portion openably and closably closed, a shutter body that is slidably supported by the dust collection chamber lid body and opens and closes the suction port, and the opening portion in the dust collection chamber. And a filter device detection device that prevents the closing operation of the dust collecting chamber lid when the dust collecting filter is not attached, and the main body case includes the dust collecting filter. The shutter has a recess into which the shutter body is inserted when the shutter body is opened with the chamber cover closed, and a pair of contacts provided in the recess and opened and closed by inserting or not inserting the shutter body. Body is the recess A normally open switch that cannot drive the electric blower when the contact is open without being inserted into the inside, and can drive the electric blower when the shutter body is inserted into the recess and the contact is closed. An electric vacuum cleaner characterized by having and. 2. A dust collection chamber lid is movably provided and engageably and disengageably engages with an engaged portion of the body case to hold the dust collection chamber lid in a closed state with respect to the body case. A locking device is provided, and the doorway of the recess into which the shutter body is inserted is opened and closed in conjunction with the locking device, and the locking device is completely engaged with the engaged portion of the main body case. The electric vacuum cleaner according to claim 1, further comprising: a recess lid that opens the doorway.