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Title:
INDUSTRIAL OR HOBBY BRUSH AND METHOD FOR MAKING IT
Document Type and Number:
WIPO Patent Application WO/2014/097097
Kind Code:
A1
Abstract:
Described is an industrial or hobby brush, comprising a first metal shell (2) made by cold moulding, with a circular cross section, equipped with a central portion (2a) and an annular peripheral portion (2b) positioned around the central portion (2a), where the centra! portion (2a) has a hole (4) in it which is coaxial with an axis of rotation (A) of the brush, and a second metal shell (3) made by cold moulding, with a circular cross section, positioned coaxial!y to the first shell (2) in such a way that an extrados (6a) of the second shell (3) faces towards an intrados (5b) of the first shell (2) to define a housing space (7). The brush also comprises a plurality of bristles (8) partly housed in the housing space (7) and partly protruding from an outer edge (2c) of the first shell (2), wherein the central portion (2a) of the first shell (2) is equipped with at least three radial reinforcement ribs (13) extending from the hole (4) away from the axis of rotation (A).

Inventors:
PALLADINI, Mattia (Via Donizzetti 28, Vignola, I-41058, IT)
Application Number:
IB2013/060931
Publication Date:
June 26, 2014
Filing Date:
December 13, 2013
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
BALESTRI, Marcella (Via Caduti in Guerra 65, Vignola, I-41058, IT)
International Classes:
A46B13/00
Foreign References:
EP0848921A1
US4408367A
GB2273237A
Other References:
"anderson cup brush with radial ribs connecting circumferential ribs", , 14 July 2010 (2010-07-14), XP055074893, nternet Retrieved from the Internet: URL:http://www.andersonproducts.com/images/catpages/crimpedcups.pdf [retrieved on 2013-08-12]
"Bossed cup brush - Jaz", , 3 September 2012 (2012-09-03), XP055074834, Internet Retrieved from the Internet: URL:http://web.archive.org/web/20120903025910/http://www.hireandhardware.ie/shop/cutting-tools-circular-saw-blades-flap-discs-grinding-discs/abrasives.html [retrieved on 2013-08-09]
"Disc brush with undulation", , 11 May 2012 (2012-05-11), XP055074859, Internet Retrieved from the Internet: URL:http://www.stafford.ie/uploads/Hilka2012brochureLR.pdf [retrieved on 2013-08-12]
AL A ALIEV: "Carbonitriding of Low and Medium-Carbon Steels in Fluidized Bed", METAL SCIENCE AND HEAT TREATMENT, KLUWER ACADEMIC PUBLISHERS-PLENUM PUBLISHERS, NE, vol. 47, no. 3-4, 1 March 2005 (2005-03-01), pages 107-110, XP019223138, ISSN: 1573-8973, DOI: 10.1007/S11041-005-0038-Y
None
Attorney, Agent or Firm:
ZERMANI, Umberto (BUGNION S.p.A, Via di Corticella 87, Bologna, I-40128, IT)
Download PDF:
Claims:
CLAIMS

1 . An industrial or hobby brush, comprising:

a first metal shell (2) made by cold moulding, having a circular cross section and equipped with a central portion (2a) and an annular peripheral portion (2b) disposed around the central portion (2a), where the central portion (2a) has a hole (4) in it which is coaxial with an axis of rotation (A) of the brush;

a second metal shell (3) made by cold moulding, having a circular cross section and disposed coaxially with the first sheli (3) in such a way that an extrados (6a) of the second shell (3) faces towards an intrados (5a) of the first sheil (2) to define a housing space (7);

a plurality of bristles (8) partly contained in the housing space (7) and partly protruding from an outer edge (2c) of the first shell (2);

characterized in that the central portion (2a) of the first shell (2) is provided with at least three radial reinforcement ribs (13) extending from the hole (4) away from the axis of rotation (A) and angularly equispaced from each other.

2. The brush according to claim 1 , characterized in that the radial ribs (13) are defined by respective elongate ridges (13a) protruding from the extrados (5a) of the first shell (2) and oriented radially away from the hole (4).

3. The brush according to claim 1 or 2, characterized in that also the annular peripheral portion (2b) of the first shell (2) is provided with respective reinforcement ribs (14),

4. The brush according to claim 3, characterized in that the reinforcement ribs (14) of the annular peripheral portion (2b) are defined by extensions (15) of the radial ribs (13) of the central portion (2a).

5. The brush according to claim 3, characterized in that the reinforcement ribs (14) of the annular peripheral portion (2b) comprise a plurality of circumferential ribs (16) extending circularly around the central portion (2a).6. The brush according to claim 3, characterized in that the reinforcement ribs (14) of the annular peripheral portion (2b) are defined by a plurality of bosses (17) which are angularly spaced around the central portion (2a).

7. The brush according to any of the preceding claims, characterized in that the outer edge (2c) of the first shell (2) has an undulated shape, forming a succession of apexes (18a) and grooves (18b), where each groove (18a) defines a housing for a plurality of bristles (8) in order to limit the displacement thereof during use of the brush.

8. The brush according to any of the preceding claims, characterized in that at least the first shell (2) is made of steel with a carbon content greater than 0,5%.

9. A method for making an industrial or hobby brush, comprising the following steps:

forming, by cold moulding, a first metal shell (2) having a circular cross section and equipped with a central portion (2a) and an annular peripheral portion (2b) disposed around the central portion (2a), where the central portion (2a) has a hole (4) in it which is coaxial with an axis of rotation (A) of the brush;

forming a second metal shell (3) by cold moulding;

preparing a ring (9) provided with a plurality of bristles (8);

aligning the first shell (2), the second shell (3) and the ring (9) along an axis of rotation (A) of the brush (1) in such a way that the ring (9) is interposed between the first shell (2) and the second shell (3);

packing the first shell (2), the second shell (3) and the ring (8) tightly together through the agency of junction means (1 );

characterized in that the step of forming the first shell (2) is performed in such a way as to form on the central portion (2a) of the first shell (2) at least three radial reinforcement ribs (13) extending from the hole (4) away from the axis of rotation (A) and angularly equispaced from each other. 10. The method according to claim 9, characterized in that it comprises at least one heat treatment step performed after the step of forming the first shell (2) and intended to increase the mechanical strength of the first shell (2).

Description:
DESCRIPTION

INDUSTRIAL OR HOBBY BRUSH AND METHOD FOR MAKING IT

Technical field

This invention relates to an industrial or hobby brush and a method for making it.

The invention applies to the field of industrial and/or hobby brushes, that is to say, brushes used for machining processes (for example, deburring of surfaces, cleaning of welds, etc.) which can be used both in industrial and private contexts.

Background art

The prior art brushes are typically of three types; cup-shaped, cone- shaped or circular.

These brushes usually comprise a first and a second metal shell, made by cold moulding and with a circular cross section, which can be coupled together coaxiaily to define an annular space for receiving a plurality of bristles (metal or synthetic) of the brush.

The bristles are generally connected to a ring and they extend radially from it, in such a way that a positioning of the ring coaxial to the shells and interposed between them results in a circular positioning of the bristles peripherally to the brush.

The shells and the ring are packed tightly together by a reduction piece crossing through them so as to define the axis of rotation.

The reduction piece preferably has a threaded inner surface to allow the coupling of the brush with actuator means. Alternatively, the reduction piece could comprise a pin protruding away from an extrados of the first shell (or outer shell) to allow the coupling with a respective cavity of the actuator means (such as, for example, a driil).

It should be noted that this invention is mainly applicable to cup or cone- shaped brushes, but can also be applied to circular brushes.

The first sheil has a central portion, with a circular cross section, equipped with a central hole for the passing through of the above-mentioned reduction piece, and an annular peripheral portion, positioned around the central portion.

In the case of cup-shaped brushes, the central portion extends in a substantially flat manner, whilst the annular peripheral portion extends with an angle such as to define a lateral partition for containing the bristles of the brush. In other words, the peripheral portion extends transversely to the central portion to define a space for containing the bristles.

In the cone-shaped brushes, both the portions extend with substantial continuity with a frustoconical trend.

The second shell, depending on the type of brush, has a shape complementary to that of the first shell.

During use, the brushes are pressed against the surface to be worked, which induces a "bowing" of the bristles, which tend to open the peripheral portion of the first shell.

Disadvantageously, the peripheral portion discharges the action of the bristles on the central portion, which tends to deform, adversely affecting, with the passing of the work cycles, the functionality of the brush. Disclosure of the invention

The aim of this invention is to provide a an industrial or hobby brush and a method for making it which overcomes the above-mentioned drawbacks of the prior art.

More specifically, the aim of this invention is to provide an industrial or hobby brush which is extremely resistant and able to maintain its functionalities unchanged for numerous work cycles and at high speeds, without increasing the thicknesses.

These aims are fully achieved by the industrial or hobby brush which forms the object of this invention.

Brief description of the drawings These and other features of the invention wiil become more apparent from the following detailed description of a preferred, non-limiting example embodiment of it, with reference to the accompanying drawings, in which:

- Figures 1a to 1d show a succession of perspective, side, top and cross- section views of a first embodiment of an industrial brush according to the invention;

- Figures 2a and 2b show a succession of perspective and side views of a second embodiment of a cup for an industrial brush according to the invention;

- Figures 3a and 3b show a succession of perspective and side views of a third embodiment of a cup for an industrial brush according to the invention;

- Figures 4a and 4b show a succession of perspective and top views of a fourth embodiment of a cup for an industriai brush according to the invention;

- Figures 5a to 5c show a succession of perspective and top views of a fifth embodiment of a cup for an industrial brush according to the invention. Detailed description of the preferred embodiments of the invention

With reference to the accompanying drawings, the numeral 1 denotes an industrial or hobby brush according to the invention.

The brush 1 comprises a first 2 and a second shell 3 (or first and second cup), having circular cross sections and positioned coaxialiy one above the other.

More specifically, the first shell 2 comprises a central portion 2a and an annular peripheral portion 2b positioned around the central portion 2a. The central portion 2a has a through hole 4 coaxial with an axis of rotation "A" of the brush. More specifically, the hole 4 defines the axis of rotation "A" of the brush 1.

The first shell 2a has a geometry at least partly concave. Thus, a relative surface outside the concavity defines and extrados 5a of the first shell 2 and a relative surface inside the concavity defines an intrados 5b of the first shell 2.

A second shell 3, which also has a circular cross section, is positioned coaxially to the first shell 2. More specifically, the second shell 3 is housed substantially inside the first shell 2 in such a way as to define a substantially annular housing space 7 for a plurality of bristles 8 of the brush 1. It should be noted that also the second shell 3 has a central hole 3d.

The hole 4 of the first shell 2 is coaxial to the hole of the second shell 3. In detail, also the second shell 3 has a substantially concave geometry. Thus, a relative surface outside the concavity of the second shell 3 defines and extrados 6a and, consequently, a relative surface inside the concavity defines an intrados 6b. In light of this, the second shell 3 is abutted to the first shell 2 in such a way that the relative extrados 6a faces the intrados of the first shell 5b, thereby defining the above-mentioned housing space 7. More specifically, an outer edge of the second shell 2 faces and is spaced from a corresponding outer edge of the second shell 3 in in such a way as to define an annular cross section 10 for the crossing of a plurality of bristles 8 of the brush 1.

The brush 1 also comprises a plurality of bristles 8 (or twisted bundles), partly housed in the housing space 7 and partly protruding from an outer edge 2c of the first shell 2 (in particular of the peripheral portion 2b).

More specifically, the brush comprises a ring 9 interposed between the first 2 and the second shell 3, coaxially to them, to which the bristles 8 (or twisted bundles) are fixed.

Each bristle 8 (or bundle) extends away from the ring 9 between a relative first end 8a, fixed to the ring 9, and a relative second end 8b protruding outside the shells 2, 3. Each bristle 8 (in particular the first end 8a) is bent around the ring 9 to connect to it.

Thus, the bristles 8 (or twisted bundles) are positioned annularly, each crossing the annular cross section 10, that is, interposed between the outer edges 2c of the first 2 and the second shell 3.

It should be noted that the bristles 8 can be of various types, that is, metallic (with twisted bundles or crimped wire) or synthetic (with smooth or crimped wire).

To keep the components together (shells 2, 3 and bristles 8), the brush 1 comprises junction means 1 associated with the first 2 and the second shell 3 for locking them in a "pack".

More specifically, the junction means 11 comprise a pin 11a inserted in the hole 4 of the first shell 2 and in that of the second shell 3 to keep them aligned (coaxial). The pin 11a is equipped with two abutment shoulders 11b at the relative ends to lock the first shell 2 to the second shell 3, preventing the moving away.

In the preferred embodiment, the pin 11a is defined by a threaded reduction piece 12 equipped with a nut at its upper end, abutting the extrados 5a of the first shell 2, and a stopping tooth at its lower end, abutting the intrados 6b of the second shell 3.

Operatively, the stopping tooth is made by drawing the reduction piece 12. The reduction piece 12 is a tubular body the lower end of which is drawn to make the stopping tooth for locking the brush 1.

it should be noted that the pin could also be of another shape, providing it is suitable for keeping the two shells 2, 3 (and the ring 9) coaxial and locked.

As indicated, the brush 1 can be cup or cone-shaped.

In the embodiment shown in Figures 1-4, the brush 1 is of the cup type. Thus, the centra! portion 2a and the peripheral portion 2b of the first shell 2 are set at an angle to one another.

More specifically, the central portion 2a has a substantially disc-shaped (flat) shape whilst the peripheral portion 2b is defined by an annular wall emerging from the central portion 2a to define a cup-shaped space.

More specifically, the peripheral portion 2b defines with the central portion 2a an angle a of between 30 and 90°.

In these embodiments, the second shell 3 also has a similar shape, that is, it is equipped with a substantially flat central portion and an annular peripheral portion.

in the embodiment shown in Figures 5a-5b, the brush 1 is of the cone type.

Thus, the central portion 2a of the first shell 2 and the peripheral portion 2b are substantially continuous to each other to define a cone-shaped (frustoconical) extension of the first sheil 2.

In other words, the central portion 2a and the peripheral portion 2b define a frustoconical annular wall extending between an inner edge, delimiting the hole 4, and an outer edge.

It should be noted that also in the cone-shape, the central portion 2a and the peripheral portion 2b could be at an angle to one another; in that case, there is an angle a between them of between 15 and 30°

In these embodiments, the second shell 3 also has a similar shape, that is, it has a substantially frustoconical geometry.

Alternatively, the brush could be of the circular type (not illustrated), with the central portion and the peripheral portion copianar with each other {angle a approximately equal to 0) and at right angles to the axis of rotation.

According to the invention, the central portion 2b of the first shell 2 is equipped with at least three radial reinforcement ribs 13 extending from the hole 4 away from the axis of rotation "A".

Advantageously, in this way the radial ribs 13 increase the rigidity of the central portion 2a opposing the deformation of the material during rotation of the brush.

Consequently, the brush 1 is more resistant and able to keep its functionalities unaltered for numerous operating cycles and increase the speed of rotation whilst keeping the thickness of the shells 2, 3 unchanged. Preferably, the brush 1 is equipped with three or four or five radial ribs 13. it should be noted that the radial ribs 13 are angularly equispaced from each other, in such a way as to maintain the equilibrium of the brush 1 during rotation about the axis of rotation "A".

Preferably, the radial ribs 13 are defined by respective elongate ridges protruding from the extrados 5a of the first shell 2 and oriented radially away from the hole 4,

In other words, each radial rib 13 is defined by a protuberance at the extrados 5a of the central portion 2a of the first shell 2.

It should be noted that the shells 2, 3 can have a thickness of between 0.2 and 5mm.

In the embodiment illustrated, each protrusion on the extrados 5a corresponds with a groove on the intrados of the central portion 2a. in light of this, the ribs are made by cold moulding, during their production.

Alternatively, in an embodiment not illustrated, the radial ribs 13 can be replaced by grooves.

In this embodiment, the moulding of the plate is performed substantially in the opposite manner to the previous case. Thus, each groove on the extrados 5a of the first shell 2 corresponds with a protuberance on the intrados 5b.

In an embodiment (such as, for example, in Figures 1a-1d, 2a, 2b, 3a, 3b, 4a, 4b), the central portion 2a of the first shell 2 comprises an annular inner rib 2 , delimiting substantially the hole 4, and an annular outer rib 22 interposed between the central portion 2a and the peripheral portion 2b. In this embodiment, the radial ribs 13 connect the annular inner rib 21 to the annular outer rib 22.

Thus, the central portion 2a is equipped with a plurality of recesses 23 delimited perimetrally by the radial ribs 13, by the annular inner rib 21 and by the annular outer rib 22.

Advantageously, the recesses 23 define a free surface on which it is possible to enter the technical and/or commercial data (such as, for example, the manufacturer's brand) of the brush 1.

Preferably, also the annular peripheral portion 2b of the first shell 2 is provided with respective reinforcement ribs 14.

In this way, the deformation action which the bristles 8, during rotation of the brush 1 , exert on the first shell 2 is also limited at the peripheral portion 2b, increasing even more the resistance of the brush 1.

In a first embodiment (Figures 1a-1d), the ribs 14 of the annular peripheral portion 2b are defined by extensions 15 of the radial ribs 13 of the central portion 2a.

In other words, the extensions 15 are aligned with the radial ribs 13 and oriented like the peripheral portion 2b.

Thus, if the peripheral portion 2b is aligned with the central portion 2a (that is, in the cone-shaped brushes), the extensions 15 (that is, the relative ribs 14) are substantially coplanar to the radial ribs 13.

On the other hand, if the peripheral portion 2b is set at an angle to the central portion 2a (that is, in the cup-shaped brushes), the extensions 15 (that is, the relative ribs 14) extend on a different plane, at an angle (transversal), with respect to that of the central portion 2a of the first shell 2.

Alternatively (or in addition), the ribs 14 of the annular peripheral portion 2b extend circumferentially about the central portion 2a; thus, they are circumferential ribs 16. in other words, the circumferential ribs 16 of the peripheral portion 2b are circular and positioned around the central portion 2a.

Advantageously, this embodiment considerabiy increases the resistance of the brush 1 as the circumferential ribs act as a chain for containing the forces exerted by the bristles 8 during rotation of the brush 1.

It should be noted that, similarly to the radial ribs 13 of the central portion 2a, the circumferential ribs 16 of the peripheral portion 2b can be defined both by protuberances and by grooves in the extrados 5a of the first shell 2. In another embodiment, the reinforcement ribs 14 of the annular peripheral portion 2b are defined by a plurality of bosses 17 which are angularly spaced around the central portion 2a.

In the embodiment illustrated, the bosses 17 are angularly equispaced from each other, in such a way as to not unbalance the brush 1 during use.

The radial ribs 13 extend from the inner edge towards the outer edge.

In the embodiment illustrated, the radial ribs 13 are only present at the central portion 2a. However, in some embodiments (not illustrated), the radial ribs 13 continue along the peripheral portion 2b, defining the relative reinforcement ribs 14 (and in particular the extensions 15).

To increase the resistance to the locking of the bristles 8, the outer edge

2c of the peripheral portion 2b of the first shell 2 has an undulated shape, forming a succession of apexes 18a and grooves 18b.

Each groove 18b defines a housing for a plurality of bristles 8 (or a twisted bundle ) in order to limit the displacement (bending) thereof during use of the brush 1.

Preferably, the second shell 3 also has the same ribs 13, 14 described for the first shell 2.

In addition, the second shell 3 also has a crimped outer edge, in such a way that each groove of the relative outer edge faces a corresponding groove 18b of the outer edge of the first shell 2.

Advantageously, in this way the bristles 8 have a greater stability and the deformation (movement) is limited during use of the brush 1.

it should be noted that the first shell 2 and the second shell 3 are made from metal.

in the embodiment illustrated, the first shell 2 is made with a steel having a percentage of carbon greater than 0.3%, preferably greater than 0.5%. In the preferred embodiment, the material is Fe 360 B or hardened steel plate.

Another object of this invention is a method for making the brush 1 (in αο

particular the first shell 2).

The method comprises preparing a metal sheet, preferably made from steel having a high percentage of carbon.

Preferably, the percentage of carbon is greater than 0.3%, more preferably greater than 0.5% (more preferably greater than 0.6%).

The method then comprises making a concave shell {corresponding to the first shell 2) by a cold moulding step.

More specifically, the cold moulding step makes a shell 2 having a circular cross section, equipped with a central portion 2a and an annular peripheral portion 2b positioned around the central portion 2a, wherein the central portion has a hole 4 coaxial with an axis of rotation "A" of the brush 1.

In addition, the method comprises making a plurality of radial ribs 13 at least on the central portion 2a of the shell 2.

Preferably, the radial ribs 13 are made simultaneously with the step of making the shell 2.

Thus, the radial ribs 13 are made by coid moulding using the same mould as the shell 2.

in addition, in a first embodiment, the method comprises making a plurality of reinforcement ribs 14 also on the peripheral portion 2b of the shell 2.

This step comprises, in a first embodiment, making an extension 15 of the radial ribs 13 on the peripheral portion 2b. Preferably, this step is performed simultaneously with that of making the radial ribs 13 {which is also performed by cold moulding).

Alternatively (Figures 2a, 2b), the step of making a plurality of reinforcement ribs 14 comprises making on the peripheral portion 2b a plurality of circumferential (annular) ribs 16.

In a further alternative, the step of making a plurality of reinforcement ribs 1 comprises making on the peripheral portion 2b a plurality of bosses 17. In ail these case, preferably, the making of the reinforcement ribs 14 is performed simultaneously with the making of the radial ribs 13, more preferably by cold moulding.

Consequently, the method comprises making the shell 2 and a plurality of reinforcement ribs 13, 14 in a single cold moulding step.

It should be noted that also the second shell 3 is preferably made with the same cold moulding cycle.

There is then a step for assembling the two shells 2, 3 with a plurality of bristles 8 (or twisted bundles) according to known methods.

More specifically, the method comprises a step of forming, by cold moulding, a second shell 3 and a step of preparing a ring 9 equipped with a plurality of bristles 8 (or twisted bundles).

The step for assembling comprises aligning the first shell 2 and the second shell 3 and the ring 9 along an axis of rotation "A" of the brush , in such a way that the ring 9 is interposed between the first shell 2 and the second shell 3;

These components (first shell 2, second she!! 3 and the ring 9) are then packed tightly together using junction means 11 (described above);

In the preferred embodiment, each shell 2, 3 is subjected to a heat treatment aimed at increasing the mechanical strength.

More specifically, if the shell 2, 3 is made from mild steel (C<0.5%), it is subjected to a carbonitriding, in order to reach a hardness of between 38 and 80 HRA.

Alternatively, if the shell 2, 3 is made from steel with C≥0.5%, it is subjected to a conventional hardening, of the surface type, in order to reach a surface hardness of between 40 and 62 HRC, without the core of the material being affected.

Clearly, the time and the temperature of these treatments (hardening or carbonitriding) are a function of the thickness and the type of material. Preferably, the shell 2 undergoes a treatment for steels for springs.

Advantageously, in this way the brush 1 is more resistant as it is able to maintain its original shape even at speeds of rotation greater than those currently permitted. In a preferred embodiment, the shell 2 is then coated with a gaseous or liquid mixture which is able to transfer carbon and nitrogen.

Preferably, the duration of this step is at least 3 or 4 hours, so as to obtain a layer cemented on the surface of the shell 2.

The invention achieves the set aims and brings important advantages. In effect, the making of the radial ribs on the central portion (and on the peripheral portion), as well as improving the aesthetic appeal of the brush, considerably increases the resistance to deformation, and in particular to the bending of the peripheral portion of the shell.

In addition, the making of circumferential ribs on the peripheral portion acts as a retaining chain, giving the brush high performance levels.

Further, the heat treatment which the shell (or the entire brush) undergoes not only relieves the stresses in the material (eliminating the internal stresses arising as a result of moulding) but increases both the hardness and the elasticity, thus increasing the bending resistance.