JPH0120895B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a suction nozzle for a vacuum cleaner which can be attached to the vacuum cleaner by means of a suction conduit and is provided with two mutually movable working members, for example a brush nozzle and a flat surface nozzle. The nozzles can be alternately brought into contact with the work surface by the operating member while the operating member moves between the two ends.

In known vacuum cleaners with fixed and movable nozzles, the movable nozzle is moved to and from the working position by means of a pedal-actuated device. An external force is applied to the upper side of the pedal to move it into the working position, and a force is applied to the lower side of the pedal to move it in a direction away from the working position. The latter force eliminates the blocking effect exerted by the blocking member arranged on the pedal.

In other vacuum cleaners with fixed and movable nozzles, these nozzles are interconnected by springs that can be adjusted to two stable positions. The fixed nozzle is further connected to both longitudinal sides of the vacuum cleaner, while the movable nozzle is connected to the central part of the appliance where the attachment pipe to the vacuum cleaner is provided. The movable nozzle is brought into the working position by pushing down on the central part, while it is returned from the operating position by pushing down on one of the side parts.

In a further known type of vacuum cleaning device,
When one of the nozzles is to be brought into the working position, a force is applied to the casing of the instrument, whereas when the other nozzle is to be brought to the operating surface, a force is applied to a pedal arranged on the casing. .

These three known devices have one drawback in common. That is, two different operations are required to bring one or the other nozzle into working position. Moreover, additional large forces are required for the switching operation.

It is an object of the invention to simplify the handling of a vacuum cleaning appliance having two nozzles that are movable with respect to each other, and for this purpose the invention has the features that are covered by the claims. The invention thus provides a suction nozzle with only one actuating element, which can be arranged, for example, on the actuating shaft of the suction conduit, and the switching operation of the working element can be carried out by hand without touching the actuating element of the nozzle itself. It can be done.

An embodiment of the invention will be described below with reference to the accompanying drawing, in which a diagrammatic cross-sectional view of a device according to the invention is shown.

The suction nozzle shown in the figure comprises a housing 10, a flat surface nozzle 11 and a brush nozzle 12.
The central part of the flat-sided nozzle is provided with a substantially vertical wall 13 , the upper end of which adjoins the housing 10 . The wall 13 forms a suction channel 14 which conducts air from the suction opening 15 of the nozzle to its attachment pipe 16 connected to the nozzle via a suction conduit with a vacuum cleaner (not shown). The brush nozzle 12 is movable between a lower or working position against the force of a spring 18 and an idle position above it by the force of the spring.

Suction conduit 1 through which the suction nozzle can be moved to the work surface
7. A valve 19 is preferably arranged in its operating shaft, not shown, with the aid of which the flow area of the suction conduit can be closed as shown in FIG. A casing 20 is arranged between the nozzle housing and the mounting pipe 16, in which a flap 21 is pivotably mounted by a cylindrical boss 22. A stepping hook 23 is connected at one end around the boss. The other free end rests on a stepping wheel 24 which has four outwardly directed projections 25 on its periphery. Additionally, two diametrically opposed cam surfaces 26
is provided on the walking wheel 24. Spring 27 holds flap 21 in the position shown in FIG. 1, in which position it closes suction passage 14.

This device operates as follows. When no air is flowing through the suction nozzle, valve 19 and flap 21 are in the position shown in FIG. The flap is actuated into the closed position by a spring 27. When valve 19 is moved to the position shown in FIG.
is rotated against the spring force into the position shown in FIG. 2 by the negative pressure generated in the suction conduit. step hook 23
is pressed against one of the protrusions 25 of the stepping wheel 24,
This also causes the stepping wheel 24 to rotate 90 degrees counterclockwise together with its cam surface. The cam surface 26 assumes the position shown in FIG. 2 and the spring 18 lifts the brush nozzle to its idle position. One operating cycle thus consists of closing and opening valve 19. When the motor fan unit of the vacuum cleaner is stopped, the flap 21 returns to the position shown in FIG. Turn the walking wheel 24 counterclockwise.
Turn only 90 degrees.

The valve 19 is preferably arranged in the operating shaft of the suction conduit and is manually actuated against the force of a spring, not shown, so that this valve closes the flow-through area of the suction conduit in its end position. . The nozzle itself can be provided with means for visually indicating the position of the operating members 11, 12 with respect to the operating surface.

One advantage of the device according to the invention is the fact that the displacement of the operating member of the nozzle can be effected manually from the operating shaft without cumbersome transmission devices such as wires, hoses or the like. Furthermore, this device has a servo action, ie the actuating force is much smaller than in a directly actuated displacement mechanism.

[Brief explanation of drawings]

FIG. 1 is a diagrammatic cross-sectional view showing the position of the brush nozzle of the suction nozzle that can be attached to the vacuum cleaner according to the present invention directed toward the work surface, and FIG.
The figure is a view similar to FIG. 1 showing the flat surface nozzle being brought into contact with the surface to be cleaned. 10...Housing, 11...Flat surface nozzle,
12...Brush nozzle, 13...Wall, 14...Suction passage, 15...Suction opening, 16...Mounting pipe, 17...Suction conduit, 18...Spring, 19...
Valve, 20...Casing, 21...Flap, 2
2...Boss, 23...Stepping hook, 24...Stepping wheel, 25...Protrusion, 26...Cam surface.

Claims (1)

Claims: 1. It is attached to the suction conduit 17 of the vacuum cleaner and is provided with a brush nozzle 12 and a flat surface nozzle 11, said nozzles being working members and alternately connected to the working surface by means of an operating member. in a suction nozzle in which the operating member is a valve 19 mounted on the suction conduit 17 remote from the nozzle, the valve 19 being mounted on the suction conduit 17 by opening or closing the suction conduit 17 to change the pressure state in the conduit. a movable blocking element 21 which is movable between two end positions in order to do so and which is mounted on said nozzle to normally close the suction passage 14 of said nozzle and which opens said suction passage by opening of said valve 19; , and upon movement of said movement blocking element into an open position, one of said working members 11, 12 is pulled away from the working surface, while due to the substantially unlimited negative pressure generated in said suction conduit 17. A suction nozzle comprising means 23, 24, 26 for bringing the other of said working members 11, 12 into contact with said working surface. 2. A suction nozzle according to claim 1, wherein the blocking element (21) changes the position of one of the working members (11, 12) with respect to the working surface and thus changes the pressure conditions in the suction conduit (17). 3. said blocking element 21 is a flap, provided with means for pivotally mounting said flap between two end positions in the vicinity of said suction channel 14, and further provided with a spring 27 for displacing said flap into a first end position; 3. A suction nozzle according to claim 2, further comprising: after the valve 19 is opened, the flap is moved to its second position based on the negative pressure generated in the suction passage 14. . 4 The attachment means is a boss 2 for the flap.
2. a pivotally mounted stepping wheel 24; and a stepping hook 23; said hook being mounted on said boss to actuate said stepping wheel during movement of said flap; Suction nozzle as described in. 5 The stepping wheel 24 is provided with two cam surfaces on its outer periphery, and these cams cause the brush nozzle 1 to
5. The suction nozzle according to claim 4, wherein the suction nozzle 2 is in contact with the working surface. 6. A suction nozzle according to claim 1, wherein the valve 19 is manually operable and thus closes the flow-through section of the suction conduit 17 in one of its end positions. 7 the nozzle is connected to the working member 11 with respect to the working surface;
2. A suction nozzle as claimed in claim 1, comprising means for visually indicating the position of each of the 12.