GB2110923A - Pressure indicating arrangement in a suction cleaner - Google Patents

Abstract

In a suction cleaner comprising a casing (2), a suction pipe (1) rotatably mounted in the casing and indicator (11) to indicate how full of dust a dust receiving bag or chamber of the cleaner is by reference to the suction pressure in the pipe, an annular chamber (3) is provided around the rotatable suction pipe and between it and the cleaner casing, the annular chamber being in communication with the pipe via bore (8) and with the indicator via bore (10). <IMAGE>

Description

SPECIFICATION Improvements in or relating to suction cleaners This invention relates to a suction cleaner includ ing a casing, a suction pipe rotatably mounted in the casing and means to indicate how full of dust a dust receiving bag or chamber of the cleaner is by reference to the suction pressure in the pipe.

Such a suction cleaner is known in which a hose is led from a position where the pressure is to be tested to means to indicate how full of dust a dust receiving bag or chamber of the cleaner is. The principle upon which this works is that, as the dust bag or chamber, or even a filter of the cleaner, becomes clogged by dust, the suction pressure drops and so this change in pressure can be indicated mechanically. It is also usual for the suction pipe to be the place where the pressure is tested and, since the suction pipe is rotatably mounted in the casing of the cleaner, then the hose has to be placed around the suction pipe in several convolutions and must also allow a sufficient free length of hose to prevent it becoming twisted when the suction pipe is rotated in any direction.Accordingly, it is disadvantageous that the hose is continuously subjected to being rotated and kinked and, depending on the material used, this more or less quickly destroys the hose. Moreover, care has to be taken that no sharp rubbing edges or corners are arranged in the space where the hose is laid, since these in time also destroy the hose.

According to the present invention, there is provided a suction cleaner including a casing, a suction pipe rotatably mounted in the casing and means to indicate how full of dust a dust receiving bag or chamber of the cleaner is by reference to the suction pressure in said pipe, communication of pressure between said pipe and said means being facilitated by an annular chamber around and in communication with said pipe, said annular chamber also being in communication via a bore in a wall of said casing with said means.

For a better understanding of the invention and to show how the same may be carried into effect, reference will now be made, by way of example, to the accompanying drawing, in which the single figure is a diagrammatic sectional view of part of a suction cleaner casing, a suction pipe and a filter-clogging indicator.

The drawing shows a suction pipe 1 which is rotatably mounted in a suction cleaner casing 2.

Between the outside of the suction pipe 1 and the suction cleaner casing 2, and by the design of the pipe 1 and casing 2, there is formed an annular chamber 3, which is sealed off at its top and bottom sides 4, 5 by respectively encircling packing rings 6, 7, which are substantially of V-section which each press on the outer wall of the suction pipe 1 and a wall of the casing 2 that defines the outer wall of the chamber 3.

The casing 2 also houses a pressure indicating element 11, this element 11 serving to give an indication, working on changing pressures, at to how full a dust bag or chamber of the cleaner is, this being achieved as a dust filter, which may, for example, be constituted by the dust bag itself, becomes clogged with dust.

Communication of pressure between the pipe 1 and the pressure indicating element 11 is facilitated by the annular chamber 3, there being a connecting bore 8 through the wall of the suction pipe 1 which connects the annular chamber 3 to the inside 9 of the suction pipe 1 and a filter 12 is provided in the pipe 1, this filter covering the bore 8 to prevent penetration of dust into the bore 8.

In addition, the casing 2 is provided with a connecting bore 10 which connects the outside of the annular chamber 3 to the pressure indicating element 11. Accordingly, pressure in the suction pipe 1 can be transmitted from the inside 9 of the pipe 1 via the connecting bore 8, the annular chamber 3 and the connecting bore 10 to the pressure indicating element 11.

With this arrangement, it can be seen that the suction pipe can be rotated through 3600 or more without restriction (for example, without requiring the provision of a hose) and facilitating pressure transmission from the pipe 1 to the indicating element 11. Because no hose is fitted around the rotatable suction pipe 1, it will be seen that the pressure indicating element 11 can be placed at a position remote from the pipe 1.

1. A suction cleaner including a casing, a suction pipe rotatably mounted in the casing and means to indicate how full of dust a dust receiving bag of chamber of the cleaner is by reference to the suction pressure in said pipe, communication of pressure between said pipe and said means being facilitated by an annular chamber around and in communication with said pipe, said annular chamber also being in communication via a bore in a wall of said casing with said means.

2. A suction cleaner as claimed in claim 1, wherein said annular chamber is closed at either end by means of encircling packing rings.

3. A suction cleaner as claimed in claim 2, wherein said packing rings are of substantially V-section which press between the walls of said annular chamber.

4. A suction cleaner as claimed in any one of the preceding claims, wherein communication between said pipe and said annular chamber is facilitated by a connecting bore in the wall of the suction pipe, said bore in said wall of said casing leading directly to said means.

5. A suction cleaner including a casing, a suction pipe rotatably mounted in the casing and means to indicate howfull of dust a dust receiving bag or chamber of the cleaner is, substantially as hereinbefore described with reference to the accompanying drawing.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (5)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Improvements in or relating to suction cleaners This invention relates to a suction cleaner includ ing a casing, a suction pipe rotatably mounted in the casing and means to indicate how full of dust a dust receiving bag or chamber of the cleaner is by reference to the suction pressure in the pipe. Such a suction cleaner is known in which a hose is led from a position where the pressure is to be tested to means to indicate how full of dust a dust receiving bag or chamber of the cleaner is. The principle upon which this works is that, as the dust bag or chamber, or even a filter of the cleaner, becomes clogged by dust, the suction pressure drops and so this change in pressure can be indicated mechanically. It is also usual for the suction pipe to be the place where the pressure is tested and, since the suction pipe is rotatably mounted in the casing of the cleaner, then the hose has to be placed around the suction pipe in several convolutions and must also allow a sufficient free length of hose to prevent it becoming twisted when the suction pipe is rotated in any direction.Accordingly, it is disadvantageous that the hose is continuously subjected to being rotated and kinked and, depending on the material used, this more or less quickly destroys the hose. Moreover, care has to be taken that no sharp rubbing edges or corners are arranged in the space where the hose is laid, since these in time also destroy the hose. According to the present invention, there is provided a suction cleaner including a casing, a suction pipe rotatably mounted in the casing and means to indicate how full of dust a dust receiving bag or chamber of the cleaner is by reference to the suction pressure in said pipe, communication of pressure between said pipe and said means being facilitated by an annular chamber around and in communication with said pipe, said annular chamber also being in communication via a bore in a wall of said casing with said means. For a better understanding of the invention and to show how the same may be carried into effect, reference will now be made, by way of example, to the accompanying drawing, in which the single figure is a diagrammatic sectional view of part of a suction cleaner casing, a suction pipe and a filter-clogging indicator. The drawing shows a suction pipe 1 which is rotatably mounted in a suction cleaner casing 2. Between the outside of the suction pipe 1 and the suction cleaner casing 2, and by the design of the pipe 1 and casing 2, there is formed an annular chamber 3, which is sealed off at its top and bottom sides 4, 5 by respectively encircling packing rings 6, 7, which are substantially of V-section which each press on the outer wall of the suction pipe 1 and a wall of the casing 2 that defines the outer wall of the chamber 3. The casing 2 also houses a pressure indicating element 11, this element 11 serving to give an indication, working on changing pressures, at to how full a dust bag or chamber of the cleaner is, this being achieved as a dust filter, which may, for example, be constituted by the dust bag itself, becomes clogged with dust. Communication of pressure between the pipe 1 and the pressure indicating element 11 is facilitated by the annular chamber 3, there being a connecting bore 8 through the wall of the suction pipe 1 which connects the annular chamber 3 to the inside 9 of the suction pipe 1 and a filter 12 is provided in the pipe 1, this filter covering the bore 8 to prevent penetration of dust into the bore 8. In addition, the casing 2 is provided with a connecting bore 10 which connects the outside of the annular chamber 3 to the pressure indicating element 11. Accordingly, pressure in the suction pipe 1 can be transmitted from the inside 9 of the pipe 1 via the connecting bore 8, the annular chamber 3 and the connecting bore 10 to the pressure indicating element 11. With this arrangement, it can be seen that the suction pipe can be rotated through 3600 or more without restriction (for example, without requiring the provision of a hose) and facilitating pressure transmission from the pipe 1 to the indicating element 11. Because no hose is fitted around the rotatable suction pipe 1, it will be seen that the pressure indicating element 11 can be placed at a position remote from the pipe 1. CLAIMS

1. A suction cleaner including a casing, a suction pipe rotatably mounted in the casing and means to indicate how full of dust a dust receiving bag of chamber of the cleaner is by reference to the suction pressure in said pipe, communication of pressure between said pipe and said means being facilitated by an annular chamber around and in communication with said pipe, said annular chamber also being in communication via a bore in a wall of said casing with said means.

2. A suction cleaner as claimed in claim 1, wherein said annular chamber is closed at either end by means of encircling packing rings.

3. A suction cleaner as claimed in claim 2, wherein said packing rings are of substantially V-section which press between the walls of said annular chamber.

4. A suction cleaner as claimed in any one of the preceding claims, wherein communication between said pipe and said annular chamber is facilitated by a connecting bore in the wall of the suction pipe, said bore in said wall of said casing leading directly to said means.

5. A suction cleaner including a casing, a suction pipe rotatably mounted in the casing and means to indicate howfull of dust a dust receiving bag or chamber of the cleaner is, substantially as hereinbefore described with reference to the accompanying drawing.