GB2350394A

GB2350394A - An end cap for an open pipe or scaffold tube

Info

Publication number: GB2350394A
Application number: GB9929554A
Authority: GB
Inventors: John Cubbison
Original assignee: T T NINEFIELDS MOULDINGS Ltd
Current assignee: T T NINEFIELDS MOULDINGS Ltd
Priority date: 1998-12-14
Filing date: 1999-12-14
Publication date: 2000-11-29
Anticipated expiration: 2019-12-14
Also published as: GB9929554D0; GB2350394B

Abstract

An end cap (10) comprises a tubular portion (11), and a plugging member (13) for insertion into the open end of a pipe or scaffold tube. Optionally, a flange (12) is connected to the tubular portion. The tubular portion may be tapered may include ribs (Figure 3, ref. 21, 22, 23) extending either circumferentially or longitudinally on its outer surface and can be moulded from a plastic material, specifically HDPE, as a one piece component. A foam bung (Figure 2, ref 16) may be pushed into the tubular portion.

Description

2350394 0:\SPECS\PSD\43276 END CAPS This invention relates to end caps and

in particular although not exclusively to end caps for use with scaffold tubes.

Scaffold tubes are straight elongate metallic tubes which can be connected together to form structures known as scaffold. Scaffold is often constructed, for example, up the face of a building to provide platforms from which work on the face of the building can be carried out without the use of ropes and harnesses and the like.

It has been found that scaffold tubes, because they are formed from hollow open ended tubes, can become resting places for debris both whilst they form part of scaffold and whilst they are in a deconstructed state. Such debris can include welding rods, screwdrivers, dust, liquid and the like. The fact that debris can fall from the scaffold tubes, especially when tubes are manipulated at height when constructing or deconstructing scaffold, poses a potential safety risk. It is an object of the present invention to provide means whereby debris can be prevented from entering open-ended tubes, including scaffold tubes.

It is known to provide for scaffold tubes which appear at around pedestrian level on a pavement or the like a bung, which is made to be blue in colour. Such bungs are typically bulbous in shape and have a diameter which is noticeably greater than the outside diameter of the scaffold tube. Their prime purpose is to make the scaffold poles visible so that pedestrians are less likely to walk into them. To achieve their purpose, these bungs tend to be both easily attachable and easily removable.

In accordance with a first aspect of the present invention, there is provided an end cap, for plugging the end of an open tube, comprising:

a tubular portion having at a first end an external dimension comparable to an internal dimension of the tube; and a blocking member extending transversely across the tubular portion, the end cap being capable of insertion completely into the tube.

In accordance with a second aspect of the present invention, there is provided an end cap, for plugging the end of an open tube, comprising a tubular portion; a flange 2 connected at a first end of the tubular portion; and a plugging member connected across the tubular portion.

An embodiment of the present invention will now be described with reference to the accompanying drawings of which:

Figure 1 shows an end cap in accordance with the present invention; Figure 2 shows the Figure 1 end cap installed in a scaffold tube; and Figure 3 shows an end section and a lengthways section of a second embodied end cap in accordance with the present invention.

Referring to Figure 1, the end cap 10 comprises generally a tapered tubular portion 11, a rim or flange 12 and a plugging member 13. The end cap 10 is moulded from HDPE coloured with a blue colorant. The end cap 10 tapers from an outside diameter of 38.0 mm at A to a diameter of 41.0 mm at B, and onto the underside of the flange 12 at substantially the same degree of tapering. The inside diameter of a scaffold tube for which this end cap is suitable is 41.0 mm. The distance C between the underside of the flange 12 to the part of the tubular portion having a diameter of 41.0 mm is 5.0 mm. The thickness D of the plastics material forming the end cap 10 is about 3 mm throughout. The outer diameter E of the flange rim 12 is 49.5mm. The tapering of the tubular portion 11 allows the end cap 10 to be easily moulded.

Referring now to Figure 2, it can be seen that the end cap 10, particularly the tubular portion 11, is distorted at 15 by virtue of its inclusion in a scaffold tube 14. It is envisaged that it will be necessary for the end cap 10 to be inserted into the scaffold tube 14 with the use of a hammer, the resilience of the plastics material forming the end cap 10 serving to allow deformation of the end cap 10 without shattering or other damage occurring. This resilience allows the end cap 10 to be self securing in the scaffold tube 14 so that it cannot be easily removed either intentionally or accidentally.

This type of fit is known as an interference fit. The tapering of the tubular portion 11 eases fitting of the end cap 10 into the scaffold tube 14, as the end furthest from the flange 12 has a diameter smaller than that of the inside diameter of the scaffold tube 14.

The end cap 10 serves to close off the end of the scaffold tube 14 so that it is no longer open for debris to enter. To this end, it will be understood that the plugging member 13 need not be sheet like in structure but could equally well be replaced by a mesh or a series of bars or the like. The range of alternative configurations which 3 would prevent debris entering the scaffold tube 14 - it may be that only large debris is desired to be prevented from entering - will be apparent to the skilled person.

The end cap 10 serves also to cover the end face of the scaffold tube 14 and to cover the inner surface of the end of the scaffold tube 14. As both of these parts of the scaffold tube 14 often have metallic burrs and shards, which are formed as a result of the process of cutting scaffold tubes to length, the presence of the end cap 10 makes the scaffold tube 14 safer to hold with fingers placed inside the tube than previously.

Because the end plug 10 is made from HDPE, a significant amount of cushioning is provided on the end of the scaffold tube when the end plug 10 is fitted. This feature provides a less rigid object for contacting with, for example, workmen, machinery and such. HDPE is also chemical resistant.

In Figure 2, the end cap 10 is shown fitted with a foam bung 16. The bung 16 is self retained by virtue of its dimensions and the resilience of the foam from which it is made. The foam bung 16 may be used where especially high scaffold tube visibility is required, or where the scaffold tube is to be used near to glass structures and the like.

Referring to Figure 3, a second embodied end cap 20 comprises generally a tapered portion 11 and a plugging number 13. No flange or rim is present, which allows the end cap 20 to be inserted completely into a scaffold tube (not shown). The external dimensions of the end cap 20 are substantially the same as those of the Figure 1 end cap, except that the internal length dimension is 75 mm. to accommodate easily additional lengths of scaffold feet. The end cap 20 further comprises longitudinal ribs 21 and 22 extending longitudinally on the outer surface of the tubular portion 11 from the wider first end towards the plugging member end of the end cap. The ribs 21 are 22 mm long, and the ribs 22 are 20 mm long. The ribs 21 and 22 are tapered so as to be taller at their end furthest from the wider end of the end cap 20. When the end cap 20 is inserted into a scaffold tube, the ribs 21 and 22 are crushed and shaved off by the inner surface of the scaffold tube. This assists in providing a self-securing interference fit in the scaffold tube.

Circumferential ribs 23 are provided at spaced intervals on the inner surface of the tubular portion 11 of the end cap 20. These ribs 23 allow a scaffold pole in which the end cap is located to be more easily gripped, and provide means for retaining accessories such as flashing lights, tool holders and signs.

4

Claims

1. An end cap, for plugging the end of an open tube, comprising:

2. An end cap, for plugging the end of an open tube, comprising: 10 a tubular portion; a flange connected at a first end of the tubular portion; and a plugging member connected across the tubular portion.

3. An end cap in accordance with claim 2, in which the flange is an outwardly projecting flange having an outer diameter substantially equal to the outer diameter of the tube with which the end cap is to be used.

4. An end cap in accordance with any preceding claim, in which the blocking or plugging member extends transversely across the tubular portion at a position spaced from the first end.

5. An end cap in accordance with claim 4, in which the blocking or plugging member is at the opposite end of the tubular member to the first end.

6. An end cap in accordance with any preceding claim, in which the tubular portion is tapered so as to be larger in diameter at the first end.

7. An end cap in accordance with any preceding claim, in which the outer diameter of the tubular portion is chosen so that the end cap forms an interference fit in the tube with which the end cap is to be used.

8. An end cap in accordance with any preceding claim, in which the end cap is moulded from plastics material as a one-piece component.

9. An end cap according to claim 8, in which the plastic material is HDPE. 5

10. An end cap according to any preceding claim, comprising ribs extending substantially longitudinally on the outer surface of the tubular portion.

11. An end cap according to any preceding claim, comprising ribs extending 10 circumferentially around the inner surface of the tubular portion.

12. A scaffold end cap according to any preceding claim, the tube being a scaffold tube.

13. A scaffold tube having an end cap according to any of claims 1 to 12.

14. A scaffold tube according to claim 13, further comprising a bung which is fitted into the end cap.

15. A scaffold tube according to claim 14, in which the bung is made from foam.

16. An end cap substantially as herein described with reference to or as shown in any one of the accompanying drawings.