DK177274B1 - Grinding head - Google Patents

Abstract

Abrasive head (1) adapted to rotate about a central central axis and having a surface (2) formed with retaining grooves (5) for edge portions of a plurality of abrasive paper blanks (3) with associated support brushes (4), wherein the sandpaper arms (3) are mounted at an obliquely angled angle (6) of 20 in the direction of rotation of said surface (2), preferably approx. 300, and wherein said holding grooves (5) for said edge parts of the sanding paper blanks (3) extend from said central axis obliquely backwards in the direction of rotation of the surface (2) at an angle (7) of approx. 5 ° in relation to a radial course. In a simple way, a more optimal grinding is achieved more easily, especially of edge areas of plate-shaped blanks.

Description

DK 177274 B1

Grinding head

FIELD OF THE INVENTION

The present invention relates to a grinding head of the kind specified in the preamble of claim 1.

BACKGROUND OF THE INVENTION EP1633530B1 describes a grinding head or grinding wheel of the kind specified in the preamble of claim 1 intended to be rotated about a central axis. The abrasive disk has a surface with radial retaining grooves for end portions of abrasive paper blanks and associated support brushes having a radial extension over most of the radius of the surface having increasing height 10 inwards from the periphery.

The abrasive disk is designed so that the surface has increasing height from the inside of a periphery of the surface and that the abrasive paper strips have an approximately radial extension over most of the radius of the surface. This ensures a stable and uniform grinding and is suitable for grinding concave, convex and flat surfaces as well as recesses / depressions.

In order to obtain a more stable and good grinding of a surface, the abrasive strips are distributed polar and evenly around the surface of the abrasive disc, so that the abrasive strips here cover 20 most of the radius of the surface, which means that most of the surface of the abrasive disc can be used for abrasive.

The fact that the surface has an increasing height inwards from the periphery of the surface means that the abrasive disc will feel very stable because it is the center part of the abrasive disc which first abuts the surface which is desired to be abraded. Around the center part of the grinding wheel there will be no large lateral forces pulling the grinding wheel across the surface and it will therefore be easy to hold the grinding wheel towards the surface.

Objects of the Invention In view of the foregoing, the object of the invention is to provide a further improved grinding head, which facilitates a more optimal grinding of especially edge areas of plate-shaped items - for example furniture plates and furniture doors - or similar plate-shaped items.

2 DK 177274 B1

Description of the Invention

The abrasive head according to the invention is characterized in that the abrasive paper strips are mounted at an inclined angle of said flat forwardly inclined angle of 20-40 °, preferably about 20 °. 30 °. In a simple way, a more optimal sanding is achieved, especially of 5 outer edge areas of plate-shaped workpieces.

Preferably, the abrasive head according to the invention is simultaneously designed such that said holding groove for said edge profile portions of the abrasive paper strips extend obliquely backwards in the direction of rotation of the surface at an angle of approx. 5 ° with respect to radial gradient.

10

Conveniently, the abrasive head of the invention is designed such that said support bristles consist of relatively soft pig hair brushes.

Alternatively, the abrasive head of the invention may be configured such that said support bristles consist of soft horsehair brushes.

Or the grinding head according to the invention may be designed such that said support brushes consist of relatively rigid brushes of tampico fibers.

20 It will further be possible that the said support brushes for the purpose of optimization for specific tasks consist of an appropriate mixture of pig brushes, horsehair and tampico fibers.

drawing Description

The invention is explained in more detail below with reference to the drawing, in which:

FIG. 1 is a plan view of a prior art grinding wheel; and FIG. 2 shows a plan view of a sectional view of the known grinding wheel, cf. FIG. 1, 30 FIG. 3 shows a plan view of one embodiment of a grinding head according to the invention - shown during grinding of a sheet metal blank; FIG. 4 is a perspective view of the embodiment of FIG. 3 for illustrating an oblique angular position of the abrasive paper strips, and 3 FIG. 177274 B1 FIG. 5 is a perspective view of the embodiment of FIG. 3 to illustrate an angular rotation of the abrasive paper strips relative to the radial.

Detailed Description of the Invention

FIG. 1 shows a known abrasive head 1 having a surface 2 to which a plurality of abrasive paper blanks 3 are attached and having a radial extension over most of the radius of the surface 2. Behind each abrasive paper blank 3, the abrasive disc 1 is provided with a series of support brushes 4.

The number of abrasive blanks 3 and support brushes 4 may be arbitrary. In the illustrated known embodiment of an abrasive head 1, there are eight radial abrasive paper blanks 3 with associated single brush brush supports 4.

FIG. 2 shows the known abrasive head 1 with two abrasive paper blanks 3, which are slit, so that the sandpaper strips 3 are divided into a number of abrasive strips 5. The abrasive paper strips 3 are attached to a surface 2 of the abrasive head 1. The surface 2 has an increasing height from the inside. its periphery 6. Behind the abrasive paper strips 3 are provided support brushes 4 which have a uniform height, whereby the plaster printing will be uniform.

FIG. 3-5 show a preferred embodiment of a grinding head 1 according to the invention, wherein the grinding head 1 of FIG. 3 during rotation is moved towards the right side of the drawing - across a side edge 9 of a plate-shaped blank 10 to be sanded.

FIG. 4 primarily serves to illustrate that the abrasive paper strips 3 and associated support brushes 4 are mounted in the grinding head 1 at an inclined angle 7 forwardly in the rotation direction of said surface 2, preferably about 20-40 °. 30 °. It should be mentioned that the angle 7 is measured with respect to a generator 11 which is perpendicular to the periphery of the grinding head 1.

Like FIG. 5 serves to illustrate that said holding groove for said edge portions of abrasive paper blank 3 from said center axis extends obliquely rearwardly in the direction of rotation of the surface 2 at an angle 8 of approx. 5 ° with respect to a radial course, i.e. that the inner end of the abrasive paper blades 3 is angularly rotated with respect to said center axis.

Claims (3)

4 DK 177274 B1 A grinding head (1) arranged to rotate about a central center axis having a surface (2) formed with holding grooves for edge profile parts of a plurality of abrasive paper blanks (3) with associated support brushes (4), which - seen in the direction of rotation - is located behind 5 abrasive paper strips (3), characterized in that the abrasive paper strips (3) are mounted in a forwardly inclined angle (7) of said surface (2) of 20-40 °, preferably approx. 30 °. Grinding head (1) according to claim 1, characterized in that said holding groove for said 10 edge profile parts of abrasive paper strips (3) extends inclined rearwardly in the direction of rotation of the surface (2) at an angle (8) of approx. 5 ° with respect to radial gradient. Grinding head (1) according to claim log 2, characterized in that said support brushes (4) consist of relatively soft pig hair brushes. 15 Grinding head (1) according to claim log 2, characterized in that said support brushes (4) consist of soft horsehair brushes. Grinding head (1) according to claim log 2, characterized in that said support brushes (4) consist of relatively stiff bristles of tampico fibers. Grinding head (1) according to claim log 2, characterized in that said support brushes (4) consist of a mixture of pig brushes, horse hair and tampico fibers. DK 177274 B1 3; "·" · \. - - · ^ \ Il I / ·· - '\ J || \ '%' - .. · ..; x 'II / pi- w- yp * 1 | / \ eyjp- \ / j | S *. .,> .- · *! il? "" '' .jiiv * · V /% ► / fe * # \ '// IP M \ ¥ V.V-'P' jK \\ ^ Λ. / | i \ i Ijl 4 '^ i L .1 / Ϊ x »** ψ:« ϊ.χ s-; «). llllullllllull ^ κγ ^^^^ κγ ^^^ "^ - ~ - ~ - ~ - · ^ · ^ · · ·: -ι · ·; · · - ·; ·. · : · -. · 1.-.- .. x K ^ \ '^ y'vk Λ ^ |;. Β' J \ Xwswv ^^ F li f ^ k / / 't 9 I * || t ^ β β \ # 2 ^ i%} * s / 'f ^' i * W, w * k ™ SWo ^ ^ ^ ^ 3 S ^ s * s> \ I / \ y / a. »^ YTT ^ TfifTOVl I ^ STjTyy ^» 1 f Hl_________________ I ι (·> ** wv> \ v ^^ v; s \ '\\\\ \\\\ v> \ v · ^ y φ> - *>. O / p. gy w * DK 177274 B1 ____—! f ^ - ^ ~ - ^ "'----------- - '^ -' V- ^ | «^^ \, '-¾ S5S ^ / $ S 1: W i ^“ 3 if 1 * S' Fig, 3 iV 1 ^^ yj 3