Classifications

• • A—HUMAN NECESSITIES
  • A46—BRUSHWARE
  • A46D—MANUFACTURE OF BRUSHES
  • A46D3/00—Preparing, i.e. Manufacturing brush bodies
  • A46D3/04—Machines for inserting or fixing bristles in bodies
• • A—HUMAN NECESSITIES
  • A46—BRUSHWARE
  • A46B—BRUSHES
  • A46B3/00—Brushes characterised by the way in which the bristles are fixed or joined in or on the brush body or carrier
  • A46B3/16—Brushes characterised by the way in which the bristles are fixed or joined in or on the brush body or carrier by wires or other anchoring means, specially for U-shaped bristle tufts
• • A—HUMAN NECESSITIES
  • A46—BRUSHWARE
  • A46B—BRUSHES
  • A46B2200/00—Brushes characterized by their functions, uses or applications
  • A46B2200/10—For human or animal care
  • A46B2200/1066—Toothbrush for cleaning the teeth or dentures

Definitions

• the present invention relates to a brush with a carrier made of bamboo material for the arrangement of tufts of bristles, the carrier having a plurality of tuft holes which each serve to receive a tuft of bristles, the tufts of bristles being fastened in each case by means of a clamp in a tuft hole, the clamps to form clip projections formed at both longitudinal ends have a length 1 that is greater than the diameter D of the tuft hole, and the clips on at least one of two opposite longitudinal sides at least in the area of the clip projections at least two one above the other in the direction of the vertical axis have angeord designated and upwardly widening wedges, wherein at a lower end of the lower wedge a reduced in width compared to the width of the clamp press-in end of the clamp is formed.
• the invention also relates to a wire for forming clips for such a brush.
• a brush with a carrier made of plastic material is known, which is fastened in tuft holes with wire clips Has tufts of bristles.
• the wire clamps used for this purpose have a double wedge profile symmetrical to a clamp vertical axis, in which two mutually opposite longitudinal sides are arranged one above the other in the direction of the clamp vertical axis and widening upward.
• a press-in end corresponding in its width to the width of the clamp is formed, which is rounded over its entire width with a view to a contact that nestles against the tuft of bristles and does not injure the tufts of brushes as much as possible, so that the tuft of bristles Li- is shaped between the wire clip and the surrounding plastic material of the carrier.
• the wedge-shaped design of the long sides of the clip is intended to form sharp-edged grooves at the edges, which form a saw-tooth-like cross-section to enable appropriate anchoring in the plastic material of the carrier.
• wire clips designed in this way are not very suitable for anchoring tufts of bristles in tuft holes of a carrier made of bamboo material, the cause of which is obviously to be seen in the poor creep behavior of the bamboo material compared to a plastic material.
• the anchoring effect achieved with the known wire clip in the plastic material is attributed to the fact that the plastic material fills the sharp-edged grooves formed by the double wedge profile due to its creep behavior during its plastic deformation.
• the invention is therefore based on the object of proposing a brush that enables sufficient pull-out forces to be achieved with a carrier made of bamboo material for the arrangement of tufts of bristles, i.e. also enables the desired reliable attachment of tufts of bristles in the carrier in the case of a brush with a carrier made of bamboo material.
• the brush according to the invention has the features of claim 1.
• a wire which enables the formation of clamps which are suitable for producing such a brush has the features of claim 15.
• the brackets for training tion of clip protrusions formed at both longitudinal ends have a length 1 which is greater than the diameter D of the tuft hole, and the clips on at least one of two opposing longitudinal sides, at least in the area of the clip protrusions, are at least two one above the other in the direction of the vertical axis and have wedges widening upward, the upper ends of the wedges in the longitudinal direction of the bracket forming locking shoulders, a press-in end of the bracket that is reduced in width compared to the width of the bracket is formed at a lower end of the lower wedge.
• the clip When fastening the tuft of bristles, the clip is pressed into the tuft hole with the tufts of bristles resting on the press-in end, so that the at the longitudinal ends of the clip opposite the Penetrate diameter of the tuft holes formed clip protrusions into the bamboo material.
• the width of the press-in end of the clamp which is reduced in width compared to the width of the clamp, at the lower end of the lower wedge has a narrow front compared to the clamp width, which enables the unidirectionally arranged fiber bundles of the bamboo material to be spread apart without the bamboo fibers are destroyed when pressed in. Rather, the fiber bundles slide along the wedge surfaces during the pressing-in process in order to spring back into locking grooves formed by the superposed arrangement of the wedges due to elastic restoring forces.
• the press-in end can have a press-in flank which is inclined in accordance with the wedge angle.
• the press-in end is designed as an extension formed at the lower end of the lower wedge, so that the press-in flanks can have a flank angle that differs from the angle of the wedge surface.
• the press-in flanks are preferably parallel to the vertical axis of the clamp. It has been found to be particularly advantageous if the width of the press-in end is 0.5 to 1.5 times the width of a locking shoulder, so that the elastic restoring forces allow the bamboo fibers to nestle against the clamp after they have previously been spread apart by the press-in end .
• the groove base preferably has a width between 0.05 and 0.6 mm; particularly preferably a width between 0.2 and 0.4 mm.
• the locking grooves have a groove base parallel to the vertical axis of the clamp.
• Another embodiment which is advantageous in terms of reduced press-in forces, supports an arrangement of the bamboo fibers that is as consistently as possible nestled against the clamp over the entire height of the clamp, is made possible when the top of two wedges arranged one above the other has a locking shoulder with a greater width than the ridge formed by the lower wedge.
• the latching shoulder of the respective upper wedge preferably has a width between 5% and 15% greater than the latching shoulder of the respective lower wedge.
• the brush in which the clamp is symmetrical to the vertical axis, in such a way that the wedges formed on opposite longitudinal sides form a symmetrical double wedge profile, so that forces transverse to the vertical axis can be avoided during the pressing process and a defined alignment the bracket in the carrier is facilitated.
• the brush designed according to the invention makes it possible to provide a brush in which sufficient pull-out forces can be achieved with relatively smaller clip protrusions, so that a very high density of bristle tufts can be achieved with a large number of tuft holes arranged at a relatively small distance from one another, so that the brush according to the invention is particularly effective Way suitable for design as a toothbrush.
• the wire has wedges arranged one above the other in the direction of the vertical axis on at least one of two opposing longitudinal sides and widening upwards, the upper ends of the wedges in the longitudinal direction Formation of the wire running latching shoulders and a lower wire edge is formed at a lower end of the lower wedge, which has a reduced width compared to the wire width.
• the wire edge is formed through the lower end of the lower wedge.
• the wire edge is preferably designed as an extension formed at the lower end of the lower wedge.
• the width of the wire edge is preferably 0.5 to 1.5 times the width of a latching shoulder.
• the height of the wedges is preferably 4 to 8 times the width of the edge of the wire. It is particularly preferred if adjacent wedges are spaced from one another by spacers that form a groove base, such that a wedge surface of the upper wedge that rises from the groove base forms a groove flank and the detent shoulder of the lower wedge forms an opposite groove flank to form locking grooves.
• the groove base preferably has a width between 0.05 and 0.6 mm; particularly preferably a width between 0.2 and 0.4 mm.
• the locking grooves preferably have a groove base parallel to the vertical axis of the wire.
• a transition formed between a wedge surface and a locking shoulder is preferably configured as a convex transition edge.
• the respectively upper one of two wedges arranged one above the other preferably has a latching shoulder with a greater width than the latching shoulder formed by the lower wedge.
• the wire is preferably designed symmetrically to a vertical axis in such a way that the wedges formed in each case on the opposite longitudinal sides form a symmetrical double wedge profile.
• Fig. 1 is an isometric view of an embodiment of the brush designed as a toothbrush
• FIG. 2 shows a brush head of the brush shown in FIG. 1 with clips pressed into tuft holes of a brush head
• FIG. 4 shows a sectional illustration of the clip shown in FIG. 3 according to the section line IV-IV in FIG. 3;
• Fig. 5 is a partial sectional view of the brush head shown in Fig. 2 according to the section line V-V in Fig. 2;
• FIG. 6 is a partial sectional view of the brush head shown in FIG. 2 according to the section line VI-VI in FIG. 2.
• Fig. 1 shows a brush 10 designed in the illustrated embodiment as a toothbrush, which has a carrier 11, designed here as a brush head, which is shown in plan view in FIG. 2, with a plurality of tuft holes 12 arranged here in a grid shape, each with a tuft of bristles 13, which is anchored in the tuft hole 12 by means of a clamp 14.
• the bracket 14 shown in Figs. 3 and 4 is made from a portion of a wire which, in the case of the illustrated domesticsbei, game on both of the opposite longitudinal sides 15, 16 symmetrically to a vertical axis 17, four wedges 18 arranged one above the other in the direction of the vertical axis 17 , 19, 20 and 21, wherein the wedges 18, 19, 20 and 21 in the case of the present embodiment have a matching height h 2 and form locking shoulders 22, 23, 24 and 25 running in the longitudinal direction of the clamp 14.
• the wedges 18, 19, 20, 21 widen towards the upper ends forming the locking shoulders 22, 23, 24, 25, with between the wedges 18 and 19 adjacent in the direction of the vertical axis 17 and the wedges 19 and 20 and the wedges 20 and 21 each have an intermediate piece 26 which has a width bi and a height hl defined by the lower, tapered end of the wedges 19, 20 and 21.
• a press-fit end 27 is formed, which in the present exemplary embodiment coincides with the intermediate piece 26 both in width bi and in height hi.
• a locking groove 28 is formed, whereby a groove base 29 is formed by the intermediate pieces 26, with a groove flank 30 rising from the groove base 29 through a wedge surface 30 of the respective upper wedge 19, 20 or 21 and an opposite groove flank 31 is formed by the locking shoulder 22, 23 and 24, respectively.
• FIG. 4 also shows in particular, the locking shoulders 22, 23, 24 and 25 of the wedges 18, 19, 20 and 21 arranged one above the other in the direction of the vertical axis 17 have an increasing width b 2 , b 3 , b 4 and b 5 , due to the symmetrical arrangement of the wedges 18, 19, 20 and 21 with respect to the vertical axis 17, an upper wire edge 32 formed by the locking shoulders of the uppermost wedge 21 has twice the width b 5 .
• the press-in end 27 formed by a lower wire edge 41 has the reduced thickness bi.
• the tufts of bristles 13 are held in the tuft holes 12 in such a way that the tufts of bristles 13 in an egg-shaped form on the longitudinal sides 15, 16 and the press-in end 27 are snuggled together with the clip 14 in the tuft hole 12th are recorded that parallel tuft strands 33, 34 each Weil between a longitudinal side 15, 16 of the bracket 14 and a hole wall 35 are added.
• the tuft of bristles 13 guided around the press-in end 27 is inserted into the Bü schelloch 12 in the direction of the vertical axis 27, while at the same time formed by the longitudinal ends 36, 37 of the bracket 14, the diameter D of the tuft hole 12 überra lowing Clip protrusions 38, 39 (Fig. 2) in the direction of the vertical axis 17 are pressed into the bamboo material of the carrier 11 delimiting the tuft hole 12, in such a way that, as shown in FIG. 6, an essentially flush arrangement of the upper wire edge 32 in a carrier surface 40 is achieved.
• the locking grooves 28 formed between the wedges 18, 19 and 19, 20 and 20, 21 adjacent in the direction of the vertical axis 17 allow the formation of a free space between the locking shoulder 22, 23, 24 of the respective lower wedge and the lower end of the respective upper wedge, which the fiber strands F of the bamboo material formed unidirectionally in the bamboo material and oriented essentially parallel to the longitudinal sides 15, 16 and in the direction of the longitudinal axis of the clamp 14 after the fiber strands F had been spread apart in the course of the pressing process elastic restoring forces can fill in a large area, so that between tween the clamp 14 and the bamboo material, a corresponding form fit is formed.
• FIG. 6 clearly shows, the arrangement of the wedges 18, 19, 20, 21 one above the other in the direction of the vertical axis 17 in combination with an increasing width of the locking shoulders in the direction of the vertical axis 17 from the press-in end 27 to the upper wire edge 32 22, 23, 24, 25 the formation of an overall wedge-shaped bracket indicated in FIG. 4 by the dashed line course mercross section 42.
• the clamp 14 thus has a wedge-shaped overall cross section composed of wedge-shaped sections.
• the formation of the clamp 14 is made possible with a wedge-shaped overall cross-section, which, as shown in Fig. 4, is composed of wedge-shaped subsections arranged one above the other in the direction of the vertical axis 17, a substantial increase in the pull-out forces compared to a bracket designed accordingly in WO 98/05238.

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• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Brushes (AREA)

Priority Applications (7)

Applications Claiming Priority (2)

Publications (1)

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ID=73343998

Family Applications (1)

Country Status (8)

Cited By (2)

Citations (3)

Family Cites Families (10)

• 2020
  • 2020-10-23 PL PL20804448.7T patent/PL4048119T3/pl unknown
  • 2020-10-23 JP JP2022524148A patent/JP7554826B2/ja active Active
  • 2020-10-23 EP EP20804448.7A patent/EP4048119B1/de active Active
  • 2020-10-23 ES ES20804448T patent/ES2991087T3/es active Active
  • 2020-10-23 KR KR1020227015504A patent/KR102884997B1/ko active Active
  • 2020-10-23 US US17/770,388 patent/US12150543B2/en active Active
  • 2020-10-23 CN CN202080074504.1A patent/CN114667086B/zh active Active
  • 2020-10-23 WO PCT/EP2020/079903 patent/WO2021078948A1/de not_active Ceased

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