GB2081577A - Extrusion for forming hair stylers or rollers - Google Patents

Abstract

An extrusion for forming hair stylers or rollers, consists of a tube 5 having a circular outer cross section 7, a number of equidistantly spaced, radially extending, elongate ridges 9 around the tube, and a groove 17, which is preferably of dove tailed or other undercut cross-section, between each pair of adjacent ridges 9. An extrusion shaped in this way requires little machining or other finishing after it has been formed by extrusion. <IMAGE>

Description

SPECIFICATION Extrusions for forming hair stylers or rollers This invention relates to extrusions, preferably of plastics material, for forming hair stylers or rollers.

The object of this invention is to provide an extrusion for forming a hair styler or roller which needs very little machining or other finishing after being formed by extrusion.

According to this invention, such an extrusion consists of a tube having an outer surface, circumferentially spaced parts of which lie on a circle, a number of equidistantly angularly spaced, radially projecting, axially elongate ridges around the tube, and a groove between each pair of adjacent ridges, Preferably, each ridge has a base part integral with the tube, a ridge projection extending circumferentially of the tube from each side of the base part, and a pair of substantially radially outwardly extending surfaces defining the ridge.

Preferably also, grooves are of undercut cross section.

Some examples of extrusions in accordance with the invention will now be described with reference to the accompanying drawings in which: Figure 1 is an isometric view of one example; Figure 2 is a cross-sectional view of a second example; Figure 3 is a cross-sectional view of a third example; Figure 4 is a cross-sectional view of a fourth example; Figure 5 is a cross-section view of a fifth example; Figure 6 is a cross-sectional view of a sixth example; Figure 7 is a cross-sectional view of a seventh example; and Figure 8 is a cross-sectional view of an eighth example.

Referring to Figure 1, the extrusion, which is of thermoplastic plastics material, consists of a tubular part 1 having a peripheral wall 5, defining a cylindrical aperture 3 and having a cylindrical outer surface 7. Extending radially, and, of course, integrally from the outer surface 7 are a number of equididistantly spaced ridges 9, each having a base 11, projections 12 projecting outwardly and circumferentially from each side of the base 11, and a pair of convergent side faces 13 ending in a point 15. The projections 12 from one ridge together with adjacent projections from adjacent ridges form grooves 17 having a somewhat dove-tailed shape in cross-section.

Figures 2 to 7 show variations of the configuration as shown in Figure 1,there being differences in the shape of the ridges 9 and the shape of the grooves 17.

Figure 8 shows an extrusion having a ridge and groove shape similar to that shown in Figure 2, but however, this example has an almost substantially solid cylindrical central part, having a rectangular opening 19 therethrough, in place of the cylindrical aperture within the wall 5 of the earlier examples.

The ridges and grooves may, of course, be different from those shown in the drawings. Modifications in the shape of the ridges 9 and grooves.17 can be made under the general teachings of this invention, as long as the ridges 9 are generally radially extending and the grooves are formed between the ridges.

1. An extrusion forforminga hairstylerorroller, the extrusion consisting of a tube having an outer surface, circumferentially spaced parts of which lie on a circle, a numberof equidistantly angularly spaced, radially projecting, axially elongate ridges around the tube, and a groove between each pair of adjacent ridges.

2. An extrusion according to Claim 1, wherein each ridge has a base part integral with the tube, a ridge projection extending circumferentially of the tube from each side of the base part, and a pair of substantially radially outwardly extending surfaces defining the ridge.

3. An extrusion according to Claim 2, wherein the adjacent ridge projections of adjacent ridges form between them the sides of the groove between the adjacent ridges.

4. An extrusion according to Claim 2 or Claim 3, wherein the outwardly extending surfaces extend from the ends of the ridge projections.

5. An extrusion according to Claim 2 or Claim 3, wherein the outwardly extending surfaces extend from locations inward from the ends of the ridge projections.

6. An extrusion according to one of Claims 1 to 5, wherein the radially outer ends of the outwardly extending surfaces meet along an axially extending line.

7. An extrusion according to any one of Claims 1 to 5, wherein the radially outer ends of the outwardly extending surfaces meet in a rounded end of each ridge.

8. An extrusion according to any one of the preceding Claims, wherein the tube has a central, longitudinal aperture of circular cross section.

g. An extrusion according to any one of Claims 1 to 7, wherein the tube has a central, longitudinal aperture of rectangular cross section.

10. An extrusion according to any one of the preceding Claims, which is of thermoplastic plastics material.

11. An extrusion according to any one of the preceding Claims, in which the grooves are of undercut cross section.

12. An extrusion according to Claim 11, in which the grooves are of dove tailed cross section.

13. An extrusion according to Claim 1, stibstan- tially as described with reference to any one of the Figures of the accompanying drawings.

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

Claims (13)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Extrusions for forming hair stylers or rollers This invention relates to extrusions, preferably of plastics material, for forming hair stylers or rollers. The object of this invention is to provide an extrusion for forming a hair styler or roller which needs very little machining or other finishing after being formed by extrusion. According to this invention, such an extrusion consists of a tube having an outer surface, circumferentially spaced parts of which lie on a circle, a number of equidistantly angularly spaced, radially projecting, axially elongate ridges around the tube, and a groove between each pair of adjacent ridges, Preferably, each ridge has a base part integral with the tube, a ridge projection extending circumferentially of the tube from each side of the base part, and a pair of substantially radially outwardly extending surfaces defining the ridge. Preferably also, grooves are of undercut cross section. Some examples of extrusions in accordance with the invention will now be described with reference to the accompanying drawings in which: Figure 1 is an isometric view of one example; Figure 2 is a cross-sectional view of a second example; Figure 3 is a cross-sectional view of a third example; Figure 4 is a cross-sectional view of a fourth example; Figure 5 is a cross-section view of a fifth example; Figure 6 is a cross-sectional view of a sixth example; Figure 7 is a cross-sectional view of a seventh example; and Figure 8 is a cross-sectional view of an eighth example. Referring to Figure 1, the extrusion, which is of thermoplastic plastics material, consists of a tubular part 1 having a peripheral wall 5, defining a cylindrical aperture 3 and having a cylindrical outer surface 7. Extending radially, and, of course, integrally from the outer surface 7 are a number of equididistantly spaced ridges 9, each having a base 11, projections 12 projecting outwardly and circumferentially from each side of the base 11, and a pair of convergent side faces 13 ending in a point 15. The projections 12 from one ridge together with adjacent projections from adjacent ridges form grooves 17 having a somewhat dove-tailed shape in cross-section. Figures 2 to 7 show variations of the configuration as shown in Figure 1,there being differences in the shape of the ridges 9 and the shape of the grooves 17. Figure 8 shows an extrusion having a ridge and groove shape similar to that shown in Figure 2, but however, this example has an almost substantially solid cylindrical central part, having a rectangular opening 19 therethrough, in place of the cylindrical aperture within the wall 5 of the earlier examples. The ridges and grooves may, of course, be different from those shown in the drawings. Modifications in the shape of the ridges 9 and grooves.17 can be made under the general teachings of this invention, as long as the ridges 9 are generally radially extending and the grooves are formed between the ridges. CLAIMS

1. An extrusion forforminga hairstylerorroller, the extrusion consisting of a tube having an outer surface, circumferentially spaced parts of which lie on a circle, a numberof equidistantly angularly spaced, radially projecting, axially elongate ridges around the tube, and a groove between each pair of adjacent ridges.

2. An extrusion according to Claim 1, wherein each ridge has a base part integral with the tube, a ridge projection extending circumferentially of the tube from each side of the base part, and a pair of substantially radially outwardly extending surfaces defining the ridge.

3. An extrusion according to Claim 2, wherein the adjacent ridge projections of adjacent ridges form between them the sides of the groove between the adjacent ridges.

4. An extrusion according to Claim 2 or Claim 3, wherein the outwardly extending surfaces extend from the ends of the ridge projections.

5. An extrusion according to Claim 2 or Claim 3, wherein the outwardly extending surfaces extend from locations inward from the ends of the ridge projections.

6. An extrusion according to one of Claims 1 to 5, wherein the radially outer ends of the outwardly extending surfaces meet along an axially extending line.

7. An extrusion according to any one of Claims 1 to 5, wherein the radially outer ends of the outwardly extending surfaces meet in a rounded end of each ridge.

8. An extrusion according to any one of the preceding Claims, wherein the tube has a central, longitudinal aperture of circular cross section.

g. An extrusion according to any one of Claims 1 to 7, wherein the tube has a central, longitudinal aperture of rectangular cross section.

10. An extrusion according to any one of the preceding Claims, which is of thermoplastic plastics material.

11. An extrusion according to any one of the preceding Claims, in which the grooves are of undercut cross section.

12. An extrusion according to Claim 11, in which the grooves are of dove tailed cross section.

13. An extrusion according to Claim 1, stibstan- tially as described with reference to any one of the Figures of the accompanying drawings.