CA2232745A1 - Telescopic vent pipe for waste liquids - Google Patents

Description

This invention relates to pipes for waste liquids such as pipes for removing waste from sewage holding tanks of recreational vehicles.
Connector pipes are needed to remove liquids from a large variety of reservoirs to direct the liquids to another place. For example, it is frequently required to remove waste liquids from holding tanks into a main disposal system such as the removal of sewage from sewage holding tanks into a sewage system, the removal of waste water from domestic appliances into a drainage system, waste water from eaves troughs to a drain-away and the like. Delivery vehicles for liquids such as heating oil, water, milk and chemicals and the like also require extension hoses for transport of the liquids from a tanker vehicle to a delivery site.
While flexible elongate hoses are satisfactory for some of these applications, especially those where relatively long tortuous transport paths are required, flexible hoses can have some disadvantages. For short transport distances the storage of flexible hoses can be frustrating, such hoses tend to have a resilient spring back towards a straight configuration. If there is insufficient length to coil easily, elaborate tie-down mechanisms may be necessary.
Moreover, such flexible hoses, especially those designed for the removal of various effluence are frequently made of corrugated flexible pipe because the corrugations add rigidity to the relatively large diameter hose which is required.
Such corrugations collect dirt and, where sewage is involved, may become contaminated with sewage and are not easy to clean. The present inventor has addressed the problems involved in the provision of a relatively short extension pipe for the delivery of liquids especially effluent liquids such as sewage.

- 2 -Accordingly the invention provides rigid telescopic extension pipe for effluent having at least two pipe sections telescopically connected one to the other through a liquid tight seal, one end of the sections having a connector for connection to a reservoir of effluent.
A short section of flexible hose may be connected between said one end of said one section and the connector so that the angle of the telescopic pipe may be adjusted with respect to the reservoir.
At the discharge end of the telescopic pipe the projecting end of the pipe section may be provided with a curved outlet spout. This may be particularly useful when the extension pipe is to be used for emptying the sewage holding tank of a recreational vehicle into a septic system, for example, at a campground. In other circumstances a tapered outlet spout may be provided The short length of flexible hose may be provided with a flush out nozzle whereby the inside of the whole hose may be connected to a source of clean water after emptying effluent and the inside of the hose may be cleaned.
Because the main body of the hose is smooth on the outside without corrugations or other ribs, it may be easily wiped down. Exemplary embodiments of the invention will now be described with reference to the drawings in which:
Figure 1 shows an unextended telescopic pipe according to the invention;
Figure 2 shows the pipe of Figure 1 in extended condition being used at different angles with respect to a reservoir;

- 3 -Figure 3 shows the pipe being used from a down spout eavestrough; and Figures 4A, 4B, 4C, 4D and 4E are engineering drawings showing one suitable embodiment of pipe with dimensions.
The pipe 10 of Figures 1 and 2 comprises two telescopic sections 12, 14 of rigid pipe fabricated from plastics material. While two sections are shown, three sections may be more suitable for some purposes, allowing greater extension with possibly smaller unextended length. Section 12 is of slightly larger diameter than section 14 and waxed felt seal 16 provided between them may prevent or mitigate and liquid seepage. Seals 16 may alternatively be rubber or other conventional material. The extended pipe of Figure 1 may be retracted telescopically into a compact form for storage by sliding section 14 over section 12 as far as possible.
An interior stop 13 may be provided at a proximal end of section 12 to latch with an exterior stop 15 at the distal end of section 15 to prevent the sections becoming disengaged. Seal 16 is located on either or both sections between stops 13 and 15.
In operation, connector 18 is connected to the outlet of an effluent tank connector 18 may be of any convenient form to fit standard outlets. The telescopic pipe 10 is then extended by sliding section 12 outwardly from section 14 to extend the length of pipe 10 until it is sufficient length to reach the desired delivery point. Sections 12 and 14 as illustrated in the drawings may conveniently be about four feet in length since this will provide an extended length of around eight feet which is frequently sufficient or more than sufficient to reach from a recreation vehicle effluence tank to a septic system. If greater distances are required, the pipe 10 may be made of sections of greater

- 4 -length or additional telescopic sections may be provided.
For example, three section may easily provide an extended length of 11 feet .
An intermediate flexible link 20 may be attached between connector 18 and section 12. The connecting link 20 may be a short length of corrugated rubber ducting having a length for example of about 12.5 cm. Only a short section 22 of this link need be corrugated to provide flexibility to angle the pipe 10 where desired. In a smooth surfaced portion 24 of the link a flush out nozzle 26 may be provided connectable through a length of ordinary garden hose to any suitable tap.
At the distal outlet end of the pipe 10 a reducing link 28 may be used as an exit nozzle or as a connecting link for a curved nozzle 30 (see Figures 1 and 2) which may be directed downwardly into a delivery receptacle.
Figure 2 shows the pipe at different extensions and at different angles, both vertical and horizontal showing the ease at which the pipe 10 may be adjusted in different directions over different distances.
Figure 3 shows a different application for pipe 10 in distributing waste water from eavestrough at different angles over different distances.
When not in use the unextended pipe 10 may be stowed in suitable brackets under a recreational vehicle or in a customized compartment.
Figures 4A, 4B, 4C, 4D and 4E are drawings indicating specific dimensions of one three section embodiment. Figure 4B shows an intermediate section having stops 13A and 15A
and a seal 16.

Claims