GB2527198A

GB2527198A - Cutting arrangement

Info

Publication number: GB2527198A
Application number: GB1507659.9A
Authority: GB
Inventors: Kenneth Johnson
Original assignee: KEAH PRODUCTS Ltd
Current assignee: KEAH PRODUCTS Ltd
Priority date: 2014-05-08
Filing date: 2015-05-05
Publication date: 2015-12-16
Anticipated expiration: 2035-05-05
Also published as: GB201408174D0; GB201507659D0; GB2527198B

Abstract

A cutting arrangement 10 includes a rotatable cutting means 12 having an axis of rotation X-X. A connecting means 14 connects the cutting arrangement to a rotary tool to rotate the cutting member about the axis of rotation. The cutting means has an inwardly facing surface 30 facing the axis of rotation. The inwardly facing surface has a cutting formation 52. The inwardly facing surface extends at an acute angle relative to the axis of rotation. The inwardly facing surface may have a conical or frustoconical configuration. The cutting means may include a cylindrical skirt/side wall 18 for locating the article to be cut. The cutting arrangement may be used for cutting a chamfer in the end of a pipe.

Description

Cutting Arrangement This invention relates to cutting arrangements. More particularly, but not exclusively, this invention relates to chamfer cutters. Embodiments of the invention relate to chamfer cutters for cutting chamfers in the ends of pipes.

The installation of water carrying pipes into buildings requires the ends of the pipes to be chamfered in order to allow them to be connected to the various appliances.

The present means by which the chamfers are formed on the end of the pipes is for the fitter to cut the end at an angle with a metal file. This is unsatisfactory, because it can often lead to connections being not well made, or significant wastage of material.

According to one aspect of this invention, there is provided a cutting arrangement comprising: a rotatable cutting means having an axis of rotation; and a connecting means for connecting the cutting arrangement to a rotary tool to rotate the cutting member about the axis of rotation; the cutting means having a inwardly facing surface facing the axis of rotation, wherein the inwardly facing surface extends at an acute angle relative to the axis of rotation.

The inwardly facing surface may be of a substantially conical or substantially frustoconical configuration. The inwardly facing surface may define a receiving space for receiving the article to be cut.

According to another aspect of this invention, there is provided a cutting arrangement comprising a rotatable cutting means having an axis of rotation, and a connecting means for connecting the cutting arrangement to a rotary tool to rotate the cutting means about the axis of rotation, wherein the cutting means has a substantially conical or substantially frustoconical inwardly facing surface defining a space for receiving an article to be cut.

The cutting means may comprise a cutting portion having the inwardly facing surface. The cutting means may further include a support portion for supporting the

I

cutting portion. The support portion may extend between the cutting portion and the connecting means. The cutting portion may be of a substantially conical or substantially frustoconical configuration. The cutting portion may define a receiving space for receiving the article to be cut.

The support portion may extend radially inwardly from the cutting portion to the connecting means. The support portion may comprise an end wall, which may be circular in configuration.

The cutting means may further include a locating portion for locating the article to be cut. The locating portion may extend from the cutting portion. The locating portion may comprise a side wall, which may be annular in configuration. The locating portion may comprise a skirt extending from the cutting portion. The locating portion may be substantially cylindrical.

The cutting portion may extend between the support portion and the locating portion.

The inwardly facing surface may be bevelled relative to the locating portion and the support portion.

The inwardly facing surface may be provided with at least one cutting formation for cutting the article. Desirably, the inwardly facing surface is provided with a plurality of the cutting formations, which may be substantially equally spaced from each other around the cutting portion.

The, or each, cutting formation may comprise an inwardly extending projection on the inwardly facing surface.

The, or each, cutting formation may comprise an aperture defined by the cutting portion. The, or each, aperture may be in the form of a slot, which may be substantially rectangular. In one embodiment, the, or each, aperture may extend substantially wholly across the cutting portion. In another embodiment, the cutting portion may comprise a spacer portion between the, or each, aperture and the support portion.

The, or each, aperture may be formed by pressing or punching a region of the cutting portion inwardly thereof. The, or each, projection may comprise a burr extending inwardly from the inwardly facing surface. The, or each, burr may be formed during formation of the respective aperture. Alternatively, the cutting means may be formed by a casting process, and the projection may be formed during the casting process.

The connecting means may comprise an elongate connecting member, and may extend along the axis of rotation of the cutting means. The connecting member may comprise a connecting member suitable for connection to the chuck of a drill. In one embodiment, the connecting means may comprise an SDS connector.

The cutting arrangement may comprise a chamfer cutter. The article may comprise a pipe, and the chamfer cutter may be suitable for cutting a chamfer in an end of the pipe.

At least one embodiment of the invention will now be described by way of example only, with reference to the accompanying drawings, in which: Figure 1 is a view from one end of a first embodiment of a cutting arrangement; Figure 2 is a side view of the cutting arrangement shown in Figure 1; Figure 3 is a view along the lines Ill -Ill in Figure 2; Figure 4 is a view along the lines IV -IV in Figure 2; Figure 5 is a view along the lines V -V in Figure 4; Figure 6 is a side view of a second embodiment of a cutting arrangement; and Figure 7 is a view along the lines VII -VII in Figure 6 Figures 1 to 5 of the drawings show a first embodiment of a cutting arrangement in form of a chamfer cutter 10 for cutting a chamfer at an end of a pipe (not shown), such as a pipe made of a plastics material. The chamfer cutter 10 comprises a cutting means in the form of a cutting member 12 and an elongate connecting means 14 for connecting the chamfer cutter 10 to a tool (not shown), such as a rotary power drill. The chamfer cutter 10 is rotatable about a main axis of rotation X -X when so connected to the tool. The connecting means 14 may comprise an SDS connector.

The cutting member 12 comprises a locating portion 16, which comprises an annular cylindrical side wall 18 defining a locating space 20. An end region of a pipe to be cut is received in the locating space 20, thereby locating the pipe within the cutting member 12. The locating portion has a free end 22 defining an opening 24 through which the pipe can be inserted to be received in the locating space 20. A rolled edge formation 26 is provided at the free end 22.

The cutting member 12 further includes a cutting portion 28 having an inwardly facing surface 30, which faces the axis of rotation X -X. The cutting portion 28 and the inwardly facing surface 30 are of a frustoconical configuration. The cutting portion 28 defines an inner frustoconical cutting space 29 in which the end region of a pipe to be cut can be received.

The cutting portion 28 has a first edge 32 to which the locating portion 16 is attached. A support portion 34 extends from the cutting portion 28 to the connecting means 14. The cutting portion 28 has a second edge 36 opposite the first edge 32.

The support portion 34 is attached to the cutting portion at the second edge 36.

The support portion 34 is in the form of a substantially circular end wall 38, and extends radially inwardly from the second edge 36 to the connector 14. The support portion 34 supports the cutting portion 28 and the locating portion 16 on the connector 14. The support portion 34 is arranged substantially at right angles to the locating portion 16. The frustoconical cutting portion 28 is in the form of a bevelled wall extending between the locating portion 16 and the support portion 34.

The connecting means 14 comprises an elongate connecting member 40, which may be any connecting member suitable for connecting the cutting member 12 to a tool, such as a power drill. In the embodiment shown, the connecting member 40 comprises an SDS connector. The connecting means 14 further includes securing means for securing the connecting member 40 to the support portion 34. The securing means comprises a.

The support portion 34 defines a central aperture through which a threaded end region of the connecting member 40 is inserted. The nut and washer arrangement 42 comprises a first nut 44 and a first washer 46 mounted. The nut and washer arrangement 42 further includes a second nut 48 and a second washer 50 on the threaded end region of the connecting member 40 on the opposite side of the support portion 34. By tightening both nuts 44, 48 against the respective washers 46, 50 to urge the washers 46, 50 into tight engagement with the support portion 34, the connecting member 40 is secured to the support portion 34.

Referring to Figures 4 and 5, the cutting portion 28 includes a plurality of cutting formations 52 spaced at substantially equal intervals around the cutting portion 28.

Each cutting formation 52 comprises a through aperture in the form of a substantially rectangular slot 54 defined in the cutting portion 28 and a pair of projections 56 provided at opposite edges of the slot 54.

The projections 56 extend inwardly into the cutting space 29 from the inwardly facing surface 30. Each projection is in the form of a burr, and is less than 1/2 mm in depth.

The depth of the projections is sufficient to create a cutting action on the end of the pipe when it is inserted into the cutting space 29 and engaged with the burrs during rotation of the cutting arrangement 10.

Each slot 54 is of an elongate rectangular shape, and extends from the first edge 32 of the cutting portion 28 to the second edge 36 thereof. Each slot 54 is formed by pressing or punching inwardly on the cutting portion 28 with a suitably shaped tool to force the rectangular regions of the cutting portion into the cutting region 29. The projections 56 are formed automatically when the material is punched from the cutting portion 28. Figure 5 shows a sectional end view of one of the slots 54, in which the projections 56 can be seen. In Figure 5 the projections are shown exaggerated in size.

In use, the cutting arrangement 10 is attached to a power drill by means of the connecting means 14 in a manner that would be known to the person skilled in the art. The end region of a pipe to be chamfered is then inserted into the locating space 20 defined by the locating portion 16 and the end inserted into the cutting space 29 to engage the inwardly facing surface 30. The drill is then switched on to rotate the cutting arrangement 10 about its axis of rotation X -X, and the projections 56 cut the end of the pipe into a chamfered configuration as the pipe end is held against the inwardly facing surface 30.

Various modifications can be made without departing from the scope of the invention, for example, the frustoconical cutting portion 28 could have a greater diameter to accommodate larger diameter pipes.

Figures 6 and 7 show a further embodiment of the chamfer cutter, genrally designated 1 OA. The chamfer cutter 1 OA includes many of the features of the chamfer cutter 10 shown in Figures 1 to 5, and these features have been designated with the same reference numerals as the corresponding features of the embodiment shown in Figures 1 to 5.

The cutting portion 28 of the chamfer cutter 1 OA includes a spacer portion 60 between the slots 54 and the second edge 26. The slots 54 extend from the first edge 32 to the spacer portion 60. The provision of the spacer portion 60 provides the following advantage in the second embodiment. During the formation of the slots 54, the pressing or punching of the cutting portion 28 more cleanly removes the aforesaid rectangular regions of the cutting portion 28, compared with the formation of the slots 54 of the first embodiment. C)

There is thus described a cutting arrangement 10, 1OA that can be used to simply and effectively cut a chamfered end on to a pipe.

Claims

Claims 1. A cutting arrangement comprising: a rotatable cutting means having an axis of rotation; and a connecting means for connecting the cutting arrangement to a rotary tool to rotate the cutting member about the axis of rotation; the cutting means having an inwardly facing surface facing the axis of rotation, wherein the inwardly facing surface has a cutting formation and wherein the inwardly facing surface extends at an acute angle relative to the axis of rotation.
2. A cutting arrangement according to claim 1, wherein the inwardly facing surface defines a receiving space for receiving the article to be cut, and the inwardly facing surface is of a substantially conical or substantially frustoconical configuration.
3. A cutting arrangement according to claim 1, wherein the cutting means comprises a cutting portion having the inwardly facing surface, and wherein the cutting means further includes a support portion for supporting the cutting portion, the support portion extending between the cutting portion and the connecting means.
4. A cutting arrangement according to claim 3, wherein the cutting portion is of a substantially conical or substantially frustoconical configuration, and the cutting portion defines a receiving space for receiving the article to be cut.
5. A cutting arrangement according to claim 3 or 4, wherein the support portion extends radially inwardly from the cutting portion to the connecting means, the support portion comprising a substantially circular end wall.
6. A cutting arrangement according to claim 3, 4 or 5, wherein the cutting means further includes a locating portion for locating the article to be cut, the locating portion extending from the cutting portion.
7. A cutting arrangement according to claim 6, wherein the locating portion comprises an annular side wall.
8. A cutting arrangement according to claim 7, wherein the locating portion comprises a substantially cylindrical skirt extending from the cutting portion.
9. A cutting arrangement according to claim 6, 7 or 8, wherein the cutting portion extends between the support portion and the locating portion, and wherein the inwardly facing surface is bevelled relative to the locating portion and the support portion.
10. A cutting arrangement according to any of claims 3 to 9, wherein the inwardly facing surface is provided with at least one cutting formation for cutting the article.
11. A cutting arrangement according to claim 10, wherein the inwardly facing surface is provided with a plurality of the cutting formations, said cutting formations being substantially equally spaced from each other around the cutting portion.
12. A cutting arrangement according to claim 10 or 11, wherein the, or each, cutting formation comprises an inwardly extending projection on the inwardly facing surface.
13. A cutting arrangement according to claim 10, 11 or 12, wherein the formation is formed by pressing or punching a region of the cutting portion inwardly thereof.
14. A cutting arrangement according to any of claims 10 to 13, wherein the, or each, cutting formation comprises an aperture defined by the cutting portion,
15. A cutting arrangement according to claim 14, wherein the, or each, aperture extends substantially wholly across the cutting portion.
16. A cutting arrangement according to claim 14, wherein the cutting portion comprises a spacer portion between the, or each, aperture and the support portion.
17. A cutting arrangement according to claim 14, 15 or 16, wherein the, or each, projection comprises a burr extending inwardly from the inwardly facing surface, the, or each, burr being formed during formation of the respective aperture.
18. A cutting arrangement according to any of claims 14 to 17, wherein the aperture is in the form of a substantially rectangular slot.
19. A cutting arrangement according to any preceding claim, wherein the connecting means comprises an elongate connecting member, which extends along the axis of rotation of the cutting means.
20. A cutting arrangement according to any preceding claim in the form of a chamfer cutter for cutting a chamfer in an end of the pipe.
21. A cutting arrangement substantially as herein described with reference to the accompanying drawings.