JPS644780B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a suction force indicating device for a vacuum cleaner.

Conventionally, an electric case is provided with a transparent pipe that communicates with the suction side of the electric blower, and an indicator tube that responds to the negative pressure state on the suction side of the electric blower is slidably fitted into the transparent pipe. Some vacuum cleaners are equipped with a suction force indicating device that indicates the suction state based on the position of the vacuum cleaner. However, in such devices, the suction force indicating device is generally provided in an electric case that is separated from the location where the user is located during cleaning, so it is difficult to know the indicated state. Therefore, there is a device that lights up a lamp when the suction force weakens due to filter clogging, etc., so that the situation can be known reliably from a distance. However, such a device has the disadvantage that the structure is complicated.

For this reason, for example,
As described in Publication No. 176664, in a dust collection amount display device equipped with a pointer whose movement distance is determined in accordance with the degree of negative pressure in the dust collection chamber, the pointer is made into an opaque cylindrical shape. Some devices have a lamp inside that does not move, and when the pointer moves, the lamp is exposed so that the clogged state of the filter can be recognized even from a distance.

However, in this type of dust collection amount display device, the lamp is disposed in the drive circuit of the electric blower, so even if the lamp is disconnected, the vacuum cleaner itself operates normally. Therefore, when the lamp burns out, even if the filter becomes clogged, the lamp is not lit and the intended purpose cannot be achieved.

The present invention has been made in view of the above points, and an object thereof is to obtain a suction force indicating device for a vacuum cleaner, which ensures that a lamp indicating a clogged filter is always lit when the filter is in a cleanable state. With the goal.

In this invention, an electric case is provided with a window and a transparent pipe located in the window and whose tip communicates with the suction side of the electric blower, and an indicator tube is placed inside the transparent pipe on the rear end side that resists negative pressure. Apply force and fit together so that they can slide freely.
A lamp connected in series with a remote control switch is installed in the center of the rear end of the transparent pipe,
A light shielding portion that covers the lamp is provided at the rear end of the indicator barrel. Therefore, when the lamp connected in series with the remote control switch is out, the electric blower cannot be started, and cleaning is therefore impossible, so the lamp indicates clogging. When cleaning is not necessary and the electric blower can be driven and cleaning is possible, the lamp is lit normally, so the state of clogging of the filter can be reliably indicated by the light of the lamp.

An embodiment of the present invention will be described based on the drawings. First, an electric case 1 and a dust collection case 2 are detachably attached. The electric case 1 houses a cord reel 3, a transformer relay 4, and an electric blower 5, and includes a communication port 6 communicating with the suction side of the electric blower 5, and an exhaust hole 7 communicating with the exhaust side of the electric blower 5. is formed.

The electric case 1 is provided with a suction force indicating device 8 that also serves as an overheat prevention device for the electric blower 5. That is, this suction force indicating device 8 has a transparent pipe 11 whose tip communicates with the communication port 6 via a rubber cap 9 and which is located below a window 10 formed in the electric case 1 from the center to the rear end. , a spring 12, an indicator barrel 13 whose outer diameter is approximately equal to the inner diameter of the light-transmitting pipe 11, which is biased toward the rear end side of the light-transmitting pipe 11 by the spring 12, and a lamp 14. At the rear end of the transparent pipe 11, a communication hole 15 for communicating the transparent pipe 11 with the outside of the electric case 1, and a holding piece 16 located in the communication hole 15 to hold the lamp 14 are provided. It is formed. Further, a plurality of irregularities 17 are formed on the peripheral surface of the rear end of the light-transmitting pipe 11 facing the window 10, and on the peripheral surface of the rear end of the light-transmitting pipe 11 facing away from the window 10. For example, a reflective surface 1 made of a polyester film coated with something that has a metallic luster.
8 is installed. Then, the indicator tube 13
A cylindrical light shielding part 1 that covers the lamp 14 and has an outer diameter smaller than the inner diameter of the transparent pipe 11 is provided at the rear end.
9 is formed, and an opening 20 is formed in the center of such an indicator barrel 13. Further, a communication hole 21 which is normally blocked by the indicator tube 13 is formed in the transparent pipe 11, and the electric case 1 and the transparent pipe 11 are communicated with each other through the communication hole 21 and the opening 20. A ventilation passage 22 is formed.

Next, the dust collection case 2 is formed with a suction port 23 to which a suction hose (not shown) is detachably attached, and a dust collection chamber 25 in which a filter unit 24 is housed.

As shown in FIG. 4, the electric circuit is such that the primary coil 27 of the transformer relay 4 is connected to the cord 26 wound around the cord reel 3, and the contacts 28 of the transformer relay 4 and the electric blower 5 are connected to each other. A series circuit of is connected. Further, the secondary coil 29 of the transformer relay 4, the remote control switch 30 provided on the suction hose, and the lamp 14 are connected in series.

In such a configuration, when the remote control switch 30 is turned on, the lamp 14 lights up and the electric blower 5 is driven, and the suction air generated by the electric blower 5 sucks in dust, and this dust is captured by the filter unit 24. The sucked air is collected in the dust collection chamber 25, and after being purified by the filter of the filter unit 24, the electric blower 5 is cooled and the air is discharged from the exhaust hole 7 to the outside of the electric case 1. Therefore, the suction air flows smoothly and the negative pressure on the suction side of the electric blower 5 does not become high, so the suction force indicator 8 does not operate, and the light shielding part 19 formed on the indicator tube 13 closes the lamp 1.
4 is covered and the lighting state cannot be visually observed.

As the cleaning progresses, the filter of the filter unit 24 becomes clogged, and the electric blower 5
When the negative pressure on the suction side increases, the indicator tube 13 gradually moves to the tip of the transparent pipe 11 against the spring 12, and the lamp 14 is exposed.
The lighting state of the lamp 14 can be reliably visually observed even from a distance from the electric case 1. Therefore, the user can reliably know the suction state. The structure for this can be simplified by providing the lamp 14 on the transparent pipe 11 and providing the light shielding part 19 on the indicator tube 13. Furthermore, the lamp 14 is held by a holding piece 16 formed on the transparent pipe 11, thereby further simplifying the structure. The light from the lamp 14 that is visible to the naked eye is increased in brightness because the light-transmitting pipe 11 is provided with a reflective surface 18, and the light is diffused because the unevenness 17 is provided. It can be viewed from any direction. In addition, due to the unevenness 17, the lamp 14
will be moderated and the value of the product will increase.

When the filter of the filter unit 24 becomes more clogged, the communication hole 21 that has been blocked by the indicator tube 13 and the opening 2 of the light-transmitting pipe 11 become clogged.
By forming the ventilation passage 22 in communication with the transparent pipe 11, outside air flows into the transparent pipe 11. This outside air flows into the suction side of the electric blower 5 to cool the electric blower 5 and prevent damage due to overheating.

As described above, this invention provides an electric case with a window and a transparent pipe located in the window and whose tip communicates with the suction side of the electric blower, and an indicator tube is placed inside the transparent pipe to resist negative pressure. It is biased toward the rear end side and slidably fitted, a lamp connected in series with a remote control switch is installed in the center of the rear end of the transparent pipe, and the lamp is covered at the rear end of the indicator tube. Since the light shielding part is installed, when the lamp connected in series with the remote control switch is out, the electric blower cannot be started, and cleaning is therefore impossible.
There is no need to use a lamp to indicate clogging, and the lamp lights up normally when the electric blower can be driven and cleaning is possible, so the clogging status of the filter can be reliably indicated by the light of the lamp. This has the effect of making it possible to

[Brief explanation of drawings]

The drawings relate to one embodiment of the present invention, and FIG. 1 is an overall longitudinal sectional side view, FIG. 2 is an enlarged longitudinal sectional side view of the main parts, and FIG. 3 is an enlarged illustration of a transparent pipe. The rear view, FIG. 4, is an electrical circuit diagram. 1...Electric case, 5...Electric blower, 10...Window,
11... Transparent pipe, 13... Indicator tube, 14... Lamp, 17... Unevenness, 18... Reflective surface, 19... Light shielding part,
22...Ventilation duct.

Claims (1)

[Claims] 1. The electric case is provided with a window and a transparent pipe located in the window, the tip of which communicates with the suction side of the electric blower, and inside this transparent pipe, the indicator tube is urged toward the rear end side against negative pressure. A lamp connected in series with a remote control switch is installed in the center of the rear end of the light-transmitting pipe, and a light-shielding part is provided at the rear end of the indicator tube to cover the lamp. Features a vacuum cleaner suction force indicating device.