EP1613190A1

EP1613190A1 - Ram for a plugging device for driving a strip-type retaining element into a bore of a toothbrush head that holds a tuft of bristles

Info

Publication number: EP1613190A1
Application number: EP04722171A
Authority: EP
Inventors: Georges Driesen; Wolfgang SCHÜPPERT; Michael DÜMIG
Original assignee: Braun GmbH
Current assignee: Braun GmbH
Priority date: 2003-04-12
Filing date: 2004-03-20
Publication date: 2006-01-11
Anticipated expiration: 2024-03-20
Also published as: EP1613190B1; CN1784158A; WO2004089157A1; DE10316963A1; US8052222B2; US20060208557A1; CN100464669C

Abstract

The invention relates to a ram (1) for a plugging device for driving a strip-type retaining element, preferably an anchor element, into a bore of a toothbrush head that holds a tuft of bristles, according to EP 1 088 495 A1. The front face of said ram (1) comprises a driving surface (2) that is designed to drive in the retaining element, the cross-section (3, 4, 15; 3, 5, 8; 3) of said surface being defined by longitudinal sides and faces (6, 7; 6, 8; 6, 10). The ram (1) has end regions (17, 20, 21) on its front face, which penetrate the material of a toothbrush head when the retaining element is driven into the bore. The cross-sectional region (24, 25, 26) of the ram (1), situated outside the end regions and penetrating the bristle hole is wider than the end regions (17) on the front face.

Description

Plunger for a stuffing tool for driving a strip-shaped retaining element in a bristle tufts receiving borehole of a toothbrush head

The invention relates to a plunger for a stuffing tool for driving a strip-shaped holding element in a bristle tufts receiving borehole of a toothbrush head according to the features of the preamble of claim 1.

From DE 195 28 762 C1 a plunger for a stuffing tool is already known according to the preamble of claim 1. According to Figures 1, 5 and 9, the plunger 30 has a rectangular cross-section, the thickness of which essentially corresponds to the individual driving surfaces of the stacked on top of each other according to Figures 1 and 5 staple 20, holding member in the future or anchor. In Fig. 9, the armature 20 are separated from a sheet metal strip 22 by the plunger 30, which is perpendicular to the longitudinal axis A of the plunger 30. The longitudinal axis A of the plunger 30 is parallel to the center lines of the bores 14 formed in the toothbrush body 12, that is, when a bore 14 is just stuffed with a tuft 16, its central axis is aligned with the longitudinal axis A of the plunger 30. The driving surface of the plunger 30 is in Fig. 5 referred to as the end face 32. The plunger 30 has wider longitudinal sides and narrower end faces, which form a rectangle and correspond in accordance with FIG. 5 in its cross section substantially to the cross section of the holding elements 20.

Perpendicular to the longitudinal axis A of the plunger 30 extends according to Figures 1 and 5, a bristle tufts 16, which is then subsequently U-shaped deformed during driving into the bore 14 and then pressed into the bore 14 as a bristle tufts. In this case, the lateral edges of the holding member 20 intersect in the edge of a bore 14 of the brush head 12, which is not apparent from the figures. The plunger 30 presses the holding element 20 so far into the edge material of a bore 14 of the brush head 12 until the armature 20 no longer protrudes from the surface of the brush head 12. The slot formed by the armature 20 during the pressing process in the bore wall - this is not shown in the figures - presses against the edges of the longitudinal sides of the armature 20 so firmly that it is firmly anchored in the brush head and so the bristle tufts 16 in the bore 14th firmly clamped.

From EP 1 088 495 A a plunger 12 for a stuffing tool 6 for driving a strip-shaped holding element 5, 22 in a bristle tufts 2 receiving bristle hole 3 according to the preamble of claim 1 is further known. According to Fig. 1 is here a thin sheet-metal wire 10 inserted into the Bestopfungswerkzeug 6, wherein this runs perpendicular to the plunger 12. The free end of the wire 10 projects transversely into the tappet 12 leading channel 11 a. If now the plunger 12 is moved in the direction of the toothbrush 4, it shears off a piece of the wire 10, which then forms the actual holding element 5, 22, which is now conveyed along the channel 11 in the direction of the toothbrush head 4. In this way, the holding element 5 according to FIG. 2 assumes a bundle of bristles 12 consisting of many filaments 16 in that it deforms in a U-shape on the holding element 5 and rests centrally. In this way, the bristle tufts 12 with the armature 5 is driven into a borehole of the toothbrush. In this case, the holding element 5 is pressed so deep into the borehole 3 until it is no longer accessible from the outside, however, now protrudes in one direction extending bristle tufts 2 with its free end a predetermined length out of the borehole. As can be seen from FIGS. 4 and 7, the end regions of the retaining element 5 dig into the bore wall of the borehole 3 and thereby form grooves (without position number) which, due to the elastic material of the brush body 4, become firmly attached to the side surfaces of the retaining element 5 Press and hold the retaining element 5 in this position in the borehole 3. In this way, the bristle tufts 2 is securely held in the borehole 3.

In practice, it has now been found that when the holes are no longer aligned with the longitudinal axis of the plunger, that is, when they are inclined to the longitudinal axis, which is often desirable today, thereby not only bristle tufts perpendicular from the toothbrush surface, but also obliquely run the toothbrush surface, there is the disadvantage that often damage the driving surfaces or even cancel the ends of the plunger. This leads to a considerable installation or repair effort, since the plunger must be removed from the stuffing tool, cut to length and reshaped. During this time, no more toothbrush heads can be stuffed, resulting in a significant loss of production.

The object of the invention is therefore to improve a plunger of the type mentioned in that it not only with aligned with the longitudinal axis of the plunger, but also with respect to the longitudinal axis of the plunger obliquely bores during the Bestopfungsvorgangs longer and does not break off early or otherwise it will be damaged. Furthermore, it is also an object of the invention to drive the holding elements or anchor clean and accurate in the holes with the plunger, so that they firmly hold the bristle tufts in the holes. This object is achieved by the characterizing features of claim 1. Characterized in that the plunger has an outwardly directed cross-sectional widening on its side surfaces in the central region, on the one hand increases the driving surface of the plunger and on the other hand increases the resistance or bending moment of the plunger. The increase in the driving surface also leads to the fact that when the retaining element or the armature when driving into the well tried to slip sideways easily still detected by the enlarged plunger surface and is driven cleanly into the bore of a brush head. By increasing the moment of resistance on the plunger holds during the pressing process of the holding element despite a possibly acting transverse load better this increased load and does not break off early. Even if the end face of the holding element is rounded, which often occurs in practice, brings the Eintreibflächenvergrößerung the plunger an effective advantage, since this also the "slip effect" largely and thus the risk of breakage of the plunger can be avoided. The same advantage is also achieved when driving partitions into a borehole, as they are driven into the boreholes on the same principle. The partitions are then used when an elongate oval well is to be divided into several sections and then each sub-well is to be poted.

The thickening and stabilization of the tappet in the bore area allows - regardless of the bore inclination or the rounding of the anchor wire - better guidance at the anchor wires. The number of ram breaks is significantly reduced. The width of the gap or cut at the edge of the hole (plunge area of the anchor) is further determined only by the anchor width and not by the design of the plunger, that a significant cross-sectional broadening of the plunger takes place only in that area, in the well - but not in the bore - dips. The bristle pull-out forces do not change compared to conventional plugging, since the brush body is mechanically deformed by the holding element or armature as before.

If you widen the anchor instead of the cross-sectional enlargement of the plunger, so you would damage their rims at higher Einpreßkräften more when it drives into a hole. With thicker anchor wires, one could also pile much less bristles with the same hole geometry, which would ultimately involve a greater wear of the brush during their use. For hole diameters of, for example, 1.5 mm, the use of an anchor width of 0.25 mm instead of 0.2 mm would lead to a reduction in the number of bores of at least 5.1%. These disadvantages are also avoided by the invention. In order to further reduce the stability of the plunger and the "slip effect" of the armature, the features of claim 2 are provided. Of course, the thickening of the side surfaces must not exceed the extent of the diameter of a bore, otherwise the thickening of the plunger would already dig into the edge of the wellbore when driving a retaining element and this would damage. The thickening on the driving surface of the plunger must therefore be present only in the area of the borehole. However, a cross-sectional enlargement of the driving surface of the plunger can already be effected according to the features of claim 3 by being formed only on a side surface of the plunger.

A plunger can be produced particularly simply if the cross-sectional widening attached to it takes place via a step (claim 4). This achieves the greatest possible increase in a cross-sectional widening beyond the region which no longer penetrates into the material of the bristle head. According to the features of claims 5 to 7, the cross-sectional widening in rectangular (claim 5), in trapezoidal (claim 6) or partially circular (claim 7) form take place. It is advantageous if the radii formed at the corners are as large as possible in order to keep notch stresses on the plunger as small as possible. The corners can be subsequently milled out of the sintered hard metal sheet, ground or otherwise mechanically worked out. But it is also possible according to the features of claim 8, to use as a ram rolled profile sheet, which has been tempered or hardened to obtain the required strength.

According to the features of claim 9, the driver of the plunger is wedge-shaped. This prevents that the plastic area is cut more than usual, which would otherwise lead to a reduction of the bristle extraction forces and an increase in the protruding bristles. With a punching range of 1, 1 mm for a hole diameter of 1, 5 mm and a minimum anchor depth of 0.85 mm, this means an angled tip of at least 75 °. With a hole diameter of 1, 7 mm, the punching area is increased by 0.2 mm, the minimum angle of 75 ° (claim 10) is maintained.

According to the features of claim 11, the supernatant of the driving surface against the acted upon by the plunger surface of the holding element is about 10 to 40%, preferably 25%. These dimensions are already a particularly stable Tappets created that have much longer life than the usual plunger have.

According to the features of claim 12, the bristle head is formed by a toothbrush head, which is preferably injection molded from plastic. In toothbrushes, in which a particularly large number of boreholes must be anchored with tufts of bristles, the tappet according to the invention has a particularly advantageous effect, since substantially longer lifetimes of the tappet are achieved. The brush head can also be part of a brush, a brush, a brush or a similar, provided with bristles tool (claim 13).

An embodiment of the invention is illustrated in the drawing and will be explained in more detail below. Show it:

1 is a plan view of the driving surface of a plunger according to the invention on an enlarged scale,

2 is a plan view of a comparison with FIG. 1 slightly modified driving surface of a plunger on an enlarged scale,

Fig. 3 is a side view of a plunger in the direction X in an enlarged scale and

Fig. 4 is a plan view of a further modified driving surface of a plunger, also on an enlarged scale.

First, it should be noted that the device for driving a retaining element into a borehole of a brush head by means of a plunger is known both from DE 195 28 762 C1 and from EP 1 088 495 A1 and has already been described there in great detail. Therefore, a re-description is omitted here. The disclosures of both applications should also be the subject of this application.

In the following, therefore, will be discussed only on the new design of the plunger 1, which is shown in Figures 1, 2 and 4 of the driving surface 2 ago. In Fig. 3, the plunger 1 is shown in fragmentary form from the side in the direction X in FIG. 4. The longitudinal axis A of the plunger 1 in FIG. 3 corresponds at the same time to that described in DE 195 28 762 C1 in FIGS. 1, 5 and 9. showed longitudinal axis same reference numerals, ie, as shown in FIG. 3, the plunger 1 extends vertically upwards, while its driving surface 2 is perpendicular to the plane of the drawing.

In FIGS. 1, 2 and 4, the driving surface 2 extends in the drawing plane. The tappet 1 according to the invention can therefore also be used in the tamping machines described in the prior art, wherein only the side profiles of the tappet 1 receiving slots in the tamping tool would have to be adapted to the newly designed plunger 1.

In FIGS. 1, 2 and 4, the driving surface 2 is formed, on the one hand, by a longitudinal side 3 with end faces 6 perpendicular thereto, which have mutually equal lengths, to which, according to FIG. 1, the protrusion surface 16, which extends from the narrower end side 7 and 2, the protrusion surface 18 and the attached at the two end regions 17, triangular-shaped protrusion surfaces 20 and according to Figure 4, the protrusion surface 19 corresponding to the protrusion surfaces 16 and 18 in their size , And the attached to the two end portions 17 rectangular protruding surfaces 21 must be added. The triangular protrusion surface 20 is formed according to Figure 2 of the obliquely upwardly extending end face 8 and the end faces 30, 31 which are perpendicular to each other. The rectangular projection surface 21 is formed according to FIG. 4 by the vertically extending end faces 10 and the horizontally extending side faces 32. The longitudinal sides 3, parallel to the longitudinal sides 4, 15; 5; 33. In FIG. 1, the narrow end faces 7 run perpendicular to the longitudinal sides 3, 4.

In Fig. 1, the longitudinal side 3, the length a and the narrower longitudinal side 4, the length b. In Fig. 2, the longitudinal side 3, the length a and the narrower longitudinal side 5, the length b. According to Figures 1 and 2, the end faces 6 and the longitudinal side 3 form a rectangular surface, wherein the lower longitudinal side 3 opposite, imaginary longitudinal sides a - b 11, 12 are dashed lines in the drawing. In Fig. 1 is at a distance from on both sides

formed on the upper side 13 a step 14 which extend perpendicular to the longitudinal side 3 and thus parallel to the end faces 6. The short ones formed by the lengths

Longitudinal sides 15 extend in Fig. 1 parallel to the longitudinal side 3. The Überstansflächenbereich formed by the longitudinal sides 15 and the end faces 6 is the surface area which penetrates into a bore wall when driving a retaining element (not shown), as the corresponding surface areas in Figures 4 and 7 of EP 1 088 495 A1. The remaining surface area covered by the width b would, according to the EP, engage in a borehole and thus would have no contact with the bore wall.

According to FIG. 1, the area circumscribed by the end face 7 and the shorter longitudinal side 15 forms the projection area 16 on the plunger 1 according to the invention. This projection surface 16 increases the otherwise known in the art driving surface, which would be known only from the dimensions a • d would be composed. In FIG. 2, the drive-in surface 2, including the projection surface 18, is still increased by the triangular surface 20 in relation to the drive-in surface 2 including the projection surface 16 in FIG. 1. In this case, the narrow end face 8 preferably forms an angle g of about 8 + 2 °.

The area extending beyond the length b area, which, as shown in Figures 1, 2 and 4, the end portions 17 of the plunger 1 forms is that region which - according to the aforementioned EP - penetrates into the bore wall of a brush head and In doing so, the holding element is displaced into the borehole so far that it no longer protrudes on the bristle-side surface of the bristle head after the ram has moved out of the borehole again. The cross-sectional area 24, 25, 26 of the tappet 1, which lies between the end area surfaces 17, which dips into the bristle hole, is wider in FIG. 1 by the projection area 16 than the end-face area areas 17.

If one compares the narrow end face 8 according to FIG. 2 with the narrow end face 15 according to FIG. 1, it is found that due to the oblique formation in FIG. 2 it displaces more material on the bristle body when the ram 1 is driven into a bore wall this is the case with the plunger 1 of FIG. 1. Most material is displaced in the plunger 1 of FIG. 4, since here on the front side 6, the narrower end face 10 is packed in the form of a rectangle, and this end portion 21 connects directly to the end face 6. The protruding surfaces 19 shown in FIG. 4 represent, with the associated end regions 21, the largest area cross section, so that the rigidest plunger 1 results here as well. The plunger of FIG. 2 is slightly less rigid than the plunger 1 of FIG. 4, while the plunger 1 of FIG. 1 is the least rigid against the plunger 1 of Figures 2 and 4, since he no in his end 17 Has supernatant surfaces. However, the plunger 1 of Fig. 1 displaced even when driving into a borehole no material on the bore wall, while this is the case with the plunger 1 of FIG. 2 and even in the plunger 1 of FIG. 4 increases by twice the supernatant surfaces 21 of the end portions 17 are here almost twice as large as the protrusion surfaces 20 at the end portions 17 of FIG. 2nd

According to Figures 1 and 2, the width d of the plunger with a hole diameter of about 1, 5 mm is preferably about 0.2 mm and the length a of about 2 mm, while the length b is about 1 mm. The total lengths c and f at the end face 6, 7 and 8 are about 0.25 mm, the length d at the end face 6 is about 0.2 mm. In Fig. 4, the length a of the side surface 3 is also about 2 mm and the length f is about 0.25 mm. When increasing the hole diameter, the corresponding parameters are increased according to the mathematical rule of three calculation.

In Fig. 3 it can be seen that at the longitudinal sides 3 on both opposite sides of the longitudinal surfaces 22 and the end portions 17 on both opposite sides of the end faces 23 connect upwards and so form the outer surface of the plunger 1. At the end regions 17, the end faces 23 are chamfered towards the outside and form an angle e of approximately 75 °. This facilitates the penetration of the plunger 1 into a bore wall of a bristle head, since the surface of the end regions 17 also penetrates the material slowly but steadily as the penetration depth increases. The end regions 17 thus form a kind of wedge surface according to FIG. 3 in order to allow the penetration resistance to rise only slowly, which avoids damage to the plunger and to the toothbrush body.

Claims

Claims:

1. plunger (1) for a tamping tool for driving a strip-shaped holding element, preferably an armature, into a bristle hole of a brush head that receives a tuft of bristles, the plunger (1) having a driving surface (2) provided for driving in the holding element, the cross-section of which Longitudinal (3, 4, 15; 3, 5, 8; 3,33,32) and end faces (6, 7; 6; 6 ^' , 10) is defined in that the plunger (1) has end areas (17 ), which penetrate into the material of the brush head when the holding element is driven in, and that the remaining cross-sectional area of the plunger (1), which plunges into the bristle hole, is wider than the front end areas (17).

2. Tappet according to claim 1, characterized in that the remaining cross-sectional area extending between the front end regions (17) is provided with an enlarged overhang (16, 18, 19) on both longitudinal sides.

3. Tappet according to claim 2, characterized in that the area of the enlarged projection (16, 18, 19) is formed only on one long side of the tappet (1).

4. Tappet according to claim 2, characterized in that the transition to the enlarged projection (16) is formed by a step as a narrower end face (7) and that the width (d) of the end region (17) corresponds essentially to the width of a holding element.

5. Tappet according to claim 1, characterized in that the entire enlarged projection (16) also extends with partial projections (20, 21) in the end regions (17).

6. Tappet according to claim 1, characterized in that the entire projection (16; 16, 19, 21) is formed by a projection or a rib which has a rectangular shape.

7. Tappet according to claim 5, characterized in that the entire enlarged projection (16, 18, 20) are formed by a projection or a rib which has a trapezoidal shape.

8. Tappet according to one of claims 1 to 5, characterized in that the enlarged projection is formed by a projection or a rib which have a part-circular shape.

9. Tappet according to claim 1, characterized in that the tappet (1) and the remaining cross-sectional area form a profile bar with a constant cross-section in its longitudinal direction.

10. Tappet according to one of the preceding claims, characterized in that the tappet (1) widens in a wedge shape from the driving surface (2).

11. Tappet according to claim 10, characterized in that the wedge tip includes an angle e of 75 °.

12. Tappet according to claim 2, characterized in that the enlarged projection (16, 18, 19) has a projection of 10% to 40%, preferably 25%, compared to the width of the respective holding element to be driven.

13. Ram according to claim 1, characterized in that the brush head is part of a toothbrush.

14. A plunger according to claim 1, characterized in that the brush head is part of a brush, a broom, a brush or a similar tool provided with bristles.

15. Tappet according to claim 1, characterized in that the length b of the narrower longitudinal side (4, 5) is smaller than the hole diameter of a tuft and a holding element receiving bore.