JP2000185001A - Extensible vacuum cleaner suction pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the mounting capability of a packing sleeve and in some cases to thereby reduce cost for mounting of the packing sleeve. SOLUTION: At least one projection 22 projecting into an intermediate space Z between an inner pipe 10 and an outer pipe 20 is attached to the inner pipe 10 as an opposite locking means, the projection being secured to the wall 21 of the inner pipe 10. A sleeve side locking means is formed by a notch 23 being open to the inner peripheral surface 19 of a packing sleeve 13 and accommodating the projection 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner tube and an outer tube, and a synthetic gasket mounted on an end of the inner end of the inner tube and disposed in an intermediate space between the inner and outer tubes. A sleeve is provided, the material thickness of the packing sleeve not being greater than the fit play between the inner and outer tubes, the packing sleeve projecting axially beyond the inner end face of the inner tube and being self-supporting. It has a packing piece that is elastically supported on the inner peripheral surface of the outer tube, and in this case, the locking means on the sleeve side and the counter locking means on the tube side,
The present invention relates to a telescopic vacuum cleaner suction pipe that secures the packing sleeve at least axially on the inner pipe.

[0002]

2. Description of the Related Art Such a vacuum cleaner suction tube is known from DE 40 17 721 A1.

[0003] Known vacuum cleaner suction tubes have proved advantageous, in particular because of the minimized suction losses. This is achieved in that the play space between the outer circumferential surface of the inner tube and the inner circumferential surface of the outer tube, which is present anyway in the telescopic seam, is used to accommodate a packing sleeve made of synthetic material. .

For positioning and mounting of the packing sleeve on the outer peripheral surface of the inner tube, known packing sleeves have locking hooks which project radially inward and elastically flex radially as locking means on the sleeve side. Having.

[0005] The inner tube of a vacuum cleaner suction tube known as a tube side opposed locking means has locking notches (openings) passing through the inner tube wall, and a sleeve side is formed in these locking notches. Lock hook hooks.

[0006] DE-OS 4017
Although the vacuum cleaner suction tube according to '721 has been found to be practically superior on a large scale, the known device is felt to need improvement with respect to its mounting and handling.

In the known device, the mounting mode which is advantageous in itself is that the packing sleeve is moved forward beyond the inner end face of the inner tube on its outer peripheral surface by its outer axial extent away from the packing piece, on the inner tube side. Until the engagement hook on the sleeve side engages with the inside of the through hole.

Since the openings form punched cutouts with sharp edges that cannot be avoided at all times, the packing is made of a relatively soft synthetic material for a good sealing effect during inconvenient mounting and handling. It cannot be ruled out that the locking hooks of the sleeve are scraped off, so that a secure installation of the packing sleeve on the inner tube is not always guaranteed.

[0009]

SUMMARY OF THE INVENTION Given the telescopic vacuum cleaner suction tube known from DE-OS 40 17 721, the object of the invention is to:
It is an object of the present invention to improve the mounting capacity of the known packing sleeves and, in some cases, to reduce the cost associated with mounting the packing sleeves.

[0010]

According to the present invention, this object is achieved as follows. That is, in the inner tube,
At least one projection protruding into the intermediate space between the inner and outer tubes is attached as an opposing locking means, the projection is fixed to the wall of the inner tube, and the locking means on the sleeve side comprises: The inner peripheral surface of the sleeve is formed by a notch which opens and accommodates the counter locking means.

A particular advantage of the device according to the invention is that a projection on the inner tube side projecting into the intermediate space between the inner and outer tubes is disclosed in DE 40 17 721 A1.
In contrast to the locking cutouts which penetrate the wall of the inner tube according to the specification, it can be formed by simple means from the outset, so that the inner contour on the sleeve side is not damaged during the mounting of the packing sleeve. On the point.

In this connection, one aspect of the invention is to allocate the notch to the material of the material pair and thus to the soft material of the packing sleeve, and to provide the tube-side counter-locking means.
Therefore, it must be recognized that it is advantageous to form the projections from the hard material of the inner tube.

To this end, the invention contemplates that the projection is permanently and non-detachably connected to the wall of the inner tube, the connection being adapted to the purpose. It can consist of a material connection between the wall of the inner tube and the projection.

In another embodiment of the invention, in the case of an inner tube made of metal, the projection is a permanently deformed stamping position which projects outwardly from the inner space of the tube. The production of such a stamping position is particularly desirable when the inner tube has at least one stamping position which is in any case determined as a withdrawal stop for the outer tube and protrudes from the outer peripheral surface of the inner tube.

In such a case, in order to manufacture the pull-out stopper, the stamping tool includes an opposed locking means on the tube side.
That is, only a small dimension needs to be offset in the axial direction to produce a projection according to the invention. It is likewise possible to produce the pull-out stop and the projection according to the invention in a single operation by means of a double stamping tool.

The configuration modification according to the present invention has the following features. That is, the notch on the sleeve side forms at least one locking surface extending laterally or inclined with respect to the generatrix of the outer peripheral surface of the inner pipe on that side remote from the inner end face of the inner pipe. This locking surface subsequently grips the corresponding opposing locking surface of the projection remote from the inner end face of the inner tube.

In a further embodiment of the invention, the particularly secure mounting of the packing sleeve is achieved as follows. That is, the projection forms a sliding surface that gently decreases in the longitudinal direction of the inner tube toward the inner end surface thereof to the outer peripheral surface thereof. In this case, the sliding surface may be a surface that is reduced in the form of a hump or an inclined road.

Although the shape of the outer contour of the projection can take any possible form, the present invention provides an advantageous configuration variant as follows. That is, at the transition to the outer peripheral surface of the inner pipe, the outer contour of the projection is substantially triangular or trapezoidal, with the triangle or trapezoidal side of the outer contour facing the inner end face of the inner pipe being the sliding surface. And the bottom of the triangular or trapezoidal profile away from the inner end surface defines the opposing locking surface.

A variant corresponding to the invention consists in that the inner contour of the notch forming the locking means on the sleeve side is aligned with the outer contour of the projection.

Providing a notch forming a locking means on the sleeve side as a sinking portion on the inner peripheral surface of the sleeve member,
Although in principle feasible, the present invention considers the formation of such cutouts as openings in the wall of the packing sleeve particularly desirable for simple manufacturability. It is expedient if the radial height of the projections is equal to or less than the thickness of the wall of the packing sleeve.

[0021] German Patent Application No. 4017, Federal Republic of Germany
A known packing sleeve according to 721 has a support ring projecting radially inward at its inner end,
This support ring, after installation of the packing sleeve,
It contacts the inner end surface of the inner tube and thus forms a cover limit.

According to the present invention, such a cover limiter can be realized in the following manner by maintaining the known support ring or by replacing the known support ring. That is, the end surface of the packing sleeve remote from the inner end surface of the inner tube projects into the intermediate space between the inner and outer tubes and abuts at least one support stop fixed to the inner tube.

A special advantage is obtained by the fact that the support stop is a permanently deformed stamping position which projects outwardly from the inner space of the inner tube, which stamping position is formed by the draw-out stop already described. You can also.

[0024]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a preferred embodiment of the invention.

An inner tube 10 made of a metal, for example a steel plate, is provided on its outer peripheral surface 12 adjacent to its inner end surface 11 with a thermoplastic, such as polyamide, polyethylene or polypropylene, suitable for the purpose of packing. It supports a packing sleeve 13 made of a synthetic material.

The inner pipe 10 is a constituent part of a telescopic vacuum cleaner suction pipe device.

In FIGS. 3 and 5, the outer tube in the upper region is indicated by dashed lines and is indicated at 20. The inner peripheral surface of the outer tube 20 has the reference number 21, while the intermediate space between the outer peripheral surface 12 of the inner tube 10 and the inner peripheral surface 21 of the outer tube 20 is denoted by Z.

The locking device supported by the outer tube 20 is not shown, and the locking device is again
It cooperates with a locking recess (not shown) of 0 to allow adjustment of various telescopic positions.

Referring to FIGS. 1, 3 and 5, the outer tube 20
When viewed from the left with respect to the tube longitudinal axis x, it must be considered to grip one axial end region of the inner tube 10 from above, for example with a socket-like locking device.

In this case, the packing sleeve 13 is arranged in a normal play space or intermediate space Z of the outer peripheral surface 12 of the inner tube 10 and the inner peripheral surface 21 of the outer tube 20.

The packing pieces 14 of the packing sleeve 13 projecting to the left in the axial direction with respect to FIGS. It is pressed against the inner peripheral surface 21.

Packing sleeve 13 corresponding to FIGS.
In the arrangement, the area 15 of the packing sleeve 13 projecting axially to the left beyond the inner end face 11 is drawn radially inward in a substantially conical manner so that a support ring 16 pointing radially inward is present. This support ring abuts the inner end face 11 in the axial direction. For the purpose, the support ring 16 covers only a part of the inner end face 11 in order to avoid a disadvantageous reduction of the inner cross-sectional area of the inner tube 10.

The inner tube 10 has a radially outwardly deformed axial guide corrugation 17 in which the
An axial guide rib 18 protruding radially inward from an inner peripheral surface 19 of the packing sleeve 13 is fitted.

The inner tube 10 has, as opposed locking means, four projections 22 projecting into the intermediate space Z between the outer peripheral surface 12 of the inner tube 10 and the inner peripheral surface 19 of the outer tube 20.

Each projection 22 is accommodated by a sleeve-side locking means in the form of a notch 23, which forms an opening in the wall of the packing sleeve 13.

Each projection 22 is materially bonded to the wall of the inner tube 10. At that time, each protrusion 22
It forms a permanently deformed stamping position that projects from the interior space 24 of the inner tube 10 into the intermediate space Z.

Each notch 23 forms a locking surface S extending laterally with respect to the generatrix M of the outer peripheral surface 12 of the inner tube 10 on the side remote from the inner end surface 11 of the inner tube 10. This locking surface subsequently grips the corresponding opposing locking surface G of the projection 22 remote from the inner end face 11 of the inner tube 10.

Each of the projections 22 forms a sliding surface 25 that is slopingly lowered toward the inner end surface 11 of the inner tube 10 and the outer peripheral surface 12 thereof.

The outer contour of each projection 22 is substantially triangular or trapezoidal at the transition to the outer peripheral surface 12 of the inner tube 10. At this time, a triangular or trapezoidal side 26 of the outer contour facing the inner end face 11 of the inner tube 10
Defines the sliding surface 25, while the base 27 of the triangular or trapezoidal contour remote from the inner end surface 11 defines the opposing locking surface G.

As can be seen particularly from FIG. 1, the inner contour of the notch 23 is substantially aligned with the outer contour of the projection 22.

As is evident from FIG. 5, the packing sleeve 13 bears on its outer end face 30 at least one support stop 28 which projects into the intermediate space Z between the inner tube 10 and the outer tube 20 and this support stop. In addition, the support ring 16 can be omitted (unconditionally omitted) when it is formed in such a way that a draw-off stop for the outer tube 20 can be formed, especially when it is extended. Absent). Support stopper 29
Also form a stamping position.

[Brief description of the drawings]

FIG. 1 shows a radially outward view of an end region with a packing sleeve of the inner tube of a telescopic vacuum cleaner suction tube.

2 is a view of the axial end face of the inner tube corresponding to the arrow indicated by II in FIG. 1;

FIG. 3 is a longitudinal sectional view corresponding to a cutting line indicated by III-III in FIG. 2;

FIG. 4 is an exploded perspective view of the packing sleeve corresponding to the direction of the line of sight indicated by IV in FIG. 1;

5 is a somewhat enlarged view corresponding to the display style of FIG. 3, showing only the upper region of the inner tube with the packing sleeve in a modified configuration.

DESCRIPTION OF SYMBOLS 10 Inner pipe 11 Inner end face 12 Outer peripheral face 13 Packing sleeve 14 Packing piece 19 Inner peripheral face 20 Outer pipe 21 Inner peripheral face 22 Opposing locking means 23 Locking means 24 Pipe internal space 25 Sliding face 26 Side 27 Bottom 29 Support stopper G Opposing locking surface M Bus bar S Locking surface x Tube longitudinal direction Z Intermediate space

Claims (12)

[Claims] 1. An inner tube (10) and an outer tube (20), mounted on the end side of an inner end (at 11) of the inner tube (10) and of the inner (10) and outer tube (20). A packing sleeve (13) made of synthetic material is provided which is arranged in the intermediate space (Z) between them, the material thickness of which lies between the inner (10) and the outer tube (20). (Z), wherein the packing sleeve (13) projects axially beyond the inner end face (11) of the inner tube (10) and is self-elastically mounted on the inner circumferential surface of the outer tube (20). 21) having a packing piece (14) supported by the locking means (2) on the sleeve side.
3) In the telescopic vacuum cleaner suction pipe, wherein the packing sleeve (13) is at least axially fixed on the inner pipe (10), and the tube-side facing locking means (22), the inner pipe (10). Has at least one projection (22) projecting into the intermediate space (Z) between the inner (10) and outer tube (20) as an opposing locking means,
2) is fixed to the wall (21) of the inner tube (10), and the locking means on the sleeve side opens on the inner peripheral surface (19) of the packing sleeve (13) and opens the projection (22). A telescopic vacuum cleaner suction tube, characterized by being formed by a receiving notch (23). 2. The telescopic vacuum cleaner suction pipe according to claim 1, wherein the projection is fixedly connected to the wall of the inner pipe in a non-removable manner. . 3. The telescopic vacuum cleaner suction pipe according to claim 1, wherein the projections (22) are materially connected to the wall of the inner pipe (10). 4. In the case of an inner tube (10) made of metal, the projection (22) is a permanently deformed stamping position projecting outwardly from the tube interior space (24). The telescopic vacuum cleaner suction pipe according to any one of claims 1 to 3. 5. The notch (23) has, on its side remote from the inner end face (11) of the inner tube (10), a cutout (23) with respect to the generatrix (M) of the outer circumferential surface (12) of the inner tube (10). At least one locking surface (S) extending laterally or at an angle
And this locking surface is the inner end face (1
5. The telescopic vacuum cleaner suction tube according to claim 1, wherein a corresponding opposite locking surface (G) of the projection (22) away from 1) is gripped from behind. . 6. A sliding surface (25) in which the projection (22) gently drops in the longitudinal direction (x) of the inner tube (10) in the direction of the inner end surface (11) to the outer peripheral surface (12) thereof. The telescopic vacuum cleaner suction pipe according to one of claims 1 to 5, characterized in that: 7. The sliding surface according to claim 6, wherein the sliding surface forms a hump or ramp.
A telescopic vacuum cleaner suction pipe according to claim 1. 8. The outer contour of the projection (22) at the transition to the outer peripheral surface (12) of the inner tube (10) is substantially triangular or trapezoidal, with the inner end face (1) of the inner tube (10).
Triangle or trapezoidal side (2) of the outer contour facing toward 1)
6) defines a sliding surface (25), and the bottom (27) of the triangular or trapezoidal profile away from the inner end surface (11) defines an opposing locking surface (G). The telescopic vacuum cleaner suction pipe according to one of claims 1 to 7, characterized in that the suction pipe is telescopic. 9. An outer contour (K) of the notch (23) forming the locking means on the sleeve side is aligned with an outer contour (26, 26; 27) of the projection (22). The vacuum cleaner suction pipe according to claim 1, wherein the suction pipe is provided. 10. Vacuum cleaner suction pipe according to claim 1, wherein the cutout (23) forms an opening in the wall of the packing sleeve (23). 11. The end face (30) of the packing sleeve (13) remote from the inner end face (11) of the inner tube (10).
Projecting into the intermediate space (Z) between the inner tube (10) and the outer tube (20) and hitting at least one support stop (29) fixed to the inner tube (10). The telescopic vacuum cleaner suction pipe according to any one of 1 to 10. 12. A support stopper (29) for connecting an inner tube (1).
The telescopic vacuum cleaner suction pipe according to claim 11, characterized in that it is a permanently deformed stamping position which projects outwardly from the internal space (24) of (0).