DE1938350A1 - Hand grinder - Google Patents

Description

June 27, 1969
rebit - $ 1758

Kurt Stoll KG., ÜTeidlingen / leak

Hand grinder

The invention relates to a hands-free device with a drive motor contained in a housing, which drives a worktop movably suspended on the housing in an oscillating movement contained in a plane displaces an abrasive on its underside, E.g. a sandpaper or sandpaper strip light exchangeable, and with a suction device for suctioning off the chips.

During the operation of such grinding devices each fall

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; 19383S0

depending on the material to be processed, coarse or fine Grinding chips, which are considered to be a major nuisance by the person running the device and the immediate vicinity be felt. In addition, soles lead to chips Soiling of the grinding device and in particular also for the faster unusable guide of the sandpaper used or abrasive linen, as chips settle into the depressions formed between the individual abrasive grains. '', ■

It is therefore already known to use hand-held grinders at the beginning mentioned type with a suction device for the accumulating Equip grinding chips. Such a known suction device contains a "frame that surrounds the worktop and between itself and the edges of the sandpaper surrounding suction slits. This arrangement has the disadvantage that it makes the worktop heavy

^w and becomes large in its planar extension without this size being able to be fully used for grinding, for example as an effective grinding surface. Rather, there is a unusable space between the edges of the sandpaper and the outer frame edge, which in particular allows the processing of angular edges, corners or the like. does not allow, since the outer frame edge, for example, abuts against a vertically upright angle leg and prevents the sanding paper edges from penetrating into the corners. The same applies to other types of contours. Despite the extremely large effort for the suction device

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their effectiveness is extremely low, especially when curved surfaces need to be machined. The object of the invention is therefore to provide a remedy here.

According to the invention, in a hand grinder of the type mentioned at the outset, the arrangement is such that the worktop is traversed by a cavity which, on the one hand, extends to the underside of the worktop via several through openings, also penetrating the sandpaper. is open and the other hand is connected via a AbsaugöfXnung with a compound -Absaugeinr.ichtung in. the cavity extends in practical. substantially over the entire extension of the countertop and ^bes? tz-t at an approximately cuboid-shaped worktop, eg flat

rismatic form. In such a work surface, the through holes are advantageous in two or three to LiAl ■ _c;? \ ¹ mastics UcIiSe the worktop symmetric and extending to the in-P.'ngfc r 'chtunc Rar; .ckanten the Arbeitspl / .TTE

; ralle "I ^: en lines and here within the line in jev; e.ls arranged in equal intervals t. The mi" .: der -Joza ^ ir- '. orri j.tung connected.-b? au £ cff ";: un: · of the cavity in the .. ^ rbe 'tspl'.tte is expedient in the rear, lower than the .jchleifgerl'tegehv 'Use the attached handle to lie.j-the area of the worktop in front of it: e: i. Zie ir-t vorte i llx-if t ir Jer deni C-chleifpa j er sent. Qover the .rbe I "'τ; / Ί atte et]; jlte- ,. C-enr '?, E'ner \; eitcre.j ..u - ;; e-

■ 00 9 8 07/09 42 "BAD ORIGINAL

According to the invention, the worktop is divided in a plane approximately parallel to the plane of the loop, with an ^{upper part suspended from the Cn; hi:} .Ui? e dee grinding device on the one hand and an upper part with the upper part in the plane of division on the other The lower part is detachably connected. The upper part consists of an approximately box-shaped frame which is open towards the parting plane and which contains the suction opening on its upper side. The lower part contains a flat plate which rests on the free edge of the frame pointing to the plane of division and which has essentially the same expansion as the surface area of the frame, sealing the cavity between the frame and plate along the frame edges rests against the frame and is releasably fastened, for example, by means of screws introduced from the top of the frame. The plate that forms the lower part contains a plate made of elastic material that is firmly attached to it, for example in love with it. Material, such as rubber or plastic, besides .. 'the cavity - facing away J? L. "", C3; -e a sandpaper - -strip rests on the. is held easily exchangeable by means of clamping elements fastened to the frame, with the rigid, for example metallic plates, the elastic lath and the sandpaper in each case being aligned with one another. - ■,;. Have bores that open the hollow space between the upper part and the lower part to the underside of the abrasive grit bearing the abrasive grit; open it up. ' ..- ■ "■■

With the hand clipping device according to the invention, ': Β'ηά the A ^r ach-:

share known "devices of this type in relation to suction the grinding chips: eliminated in excellent clay. The effort for all of the high individual parts of the suction device is · extremely low. The arrangement now also allows the grinding of angles, corners or other contours, with with the edge of the sanding paper up to the ■ tfinkel, corners or the like. can lead into it. Finally is the suction performance is also significantly improved, as the suction paths are already shorter when working on flat surfaces. In particular, however, when processing errammter Surfaces are smaller in the device according to the invention, the suction paths, which means that the suction power is essential is increased. It has been shown that with the. Hand grinder according to the invention an almost complete, e.g. about 90, suction is achieved. The arrangement according to the invention can in principle be provided for every grinding device. The suction device can be part of the grinding device and be driven by its Aririebsmotor. Likewise is it is possible to use an external suction device that is operated independently of the grinding device and connected to the suction opening; the Worktop connected via a flexible suction line, for example is. Here! Are suction devices like household vacuum cleaners Tie down zi | rindustrielien vacuum cleaners possible, with the choice of the device and thus the suction performance of the usual Schleifgui is determined. - ■ - -

Further details and advantages of the invention are based on

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the drawings explained in more detail. Show it:

Pig. 1 a hand grinder according to the invention in

• -

a side view with a detached. Sandpaper sheet,

Pig. 2 Details of the grinding device according to Propr. 1 in a vertical longitudinal section according to the section line II-II in Pig. 3, '■

3 shows the grinding device according to Pig. 1 in an insioat on its underside with detached sandpaper, · ■ '..,

Pig. 4 the lower part of the grinding device according to E ¹ Ig * 1 in a longitudinal section according to the section IV-IY

in Pig. 3; and _:

Pig. 5 Details of the sole grinder inPig. 1 in a graphical representation and partly. cut according to the YY cut in Tig.

The drawings show a hand-held grinding device 1 with a drive motor contained in the housing 2, which converts a work surface ^{3, which is movably suspended on the housing 2, into an approximately:}

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009887/0942

offset movement within level 4, in which an abrasive, especially a sheet of sandpaper or sandpaper 5 is included, which rests on the underside A of the worktop 3 when the device 1 is ready for operation and is held easily exchangeable on the worktop, e.g. by means of the clamping elements 6. At the front end of the Device 1 is a knob attached to the housing '2 handle 7 and at the rear end a handle or handle that is also fixed to the housing Handle 8 is provided on which the device is held.

According to the invention the work surface 3 is penetrated by a cavity, 'and the slip paper 5 at lo, lo ¹ passes through through-openings 11, II ¹ to the underside of the worktop 3 α out is open on the one hand over several and on the other hand through a suction opening. 12 is connected to a suction device, which is not shown here. This suction device can be part of the

Be grinding device 1 and driven by its drive motor be. However, it can also consist of an external unit operated independently of the grinding device 1 is connected to the suction opening 12 of the worktop 3. The suction device is connected via a e.g. flexible suction line 13. It can be seen that the cavity 9 extends essentially over the entire surface area the countertop 3 extends. With an approximately cuboid

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BAD ORJGINAL

. _ ■; '■ ..' ■■■■ "■■■.; - .8 -. ■ ■■ '■ - ■ .. ■■;

shaped worktop 5, as shown here, "the cavity 9 also has approximately the outline of a cuboid. From Mg * 1, 4 and 5 it can be seen that the through-openings Io, Io ', Tl * H ^{r run} at right angles to the plane 4 containing the sandpaper 5. The through-openings have the shape of bores. As can be seen in particular from Pig arranged in two rows 17, 18 symmetrical to the longitudinal center axis 14 of the worktop 3 and parallel to the longitudinal edge edges 15, 16 of the worktop 3, each at equal intervals. 2 along the longitudinal center axis 14 it can be seen that the suction opening 12 of the cavity 9 in the work surface 3, which is connected to the suction device, runs through the longitudinal center plane of the work surface 3, which is at right angles on the plane 4 of the sandpaper 5, this longitudinal center plane forming the plane of symmetry for the suction opening 12 . The suction opening 12 is provided in the rear region of the worktop 3 located below the handle 8 fastened to the soleplate housing 2, and is contained in the upper side B of the worktop 3 facing away from the sandpaper 5. The suction opening 12 runs approximately at right angles to the plane 4 containing the sandpaper 5. Depending on the plat ζ ratios sen, the suction opening 12 can also to the rear, below

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of the appliance handle 8 'lying end of the worktop 3 "run inclined, with its central axis" then being inclined to the plane 4 containing the sandpaper 5 at an * angle, for example an acute angle. In particular ¹ * from "*]? Ig. 1 and 2 it can be seen that a tubular connection piece 19 extending the suction opening 12 to the upper side B of the 'work plate' 3 for connecting the suction pipe 13 is attached to the work plate 3 ' . '

The worktop 3 is divided in a plane 2o "(Pig. 2) which is approximately parallel to the plane 4 of the sandpaper it " S "and contains on the one hand an upper part 21 suspended and attached to the housing 2 of the grinding device 1 and on the other hand a mrt dem. Upper portion 21 in the üleilungsebene 2o 'releasably connected lower part 22 Vie particular from Pig. Is ersiehtlich 5, the upper part 21 "of an approximately box-shaped' to the division plane 2ο open towards the frame 23 'contains on its upper side the Äbsauföffnung 12th The Unterteφΐ 22 contains one on the distribution level 2o. ! hinv / eisendän edges of the frame 23 resting flat plate 24 with a ⁴ "lächenausdehnung of: frame 23 substantially corresponding] lächenausdehnung that Hohlraumes.0 contained under sealing of the frame 23 and plate 24 'of the frame edges of the frame 23?..

between rather
along...

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mediumB from the top of the frame, B introduced 25 "Cligy, 1 and 2);:; Msbar attached, is. The in the

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Ϊ938350

22 · 24 given -Elatte "besitzt- also the sandpaper · 5 ■ '* ■; ■■""at Io, Io * (Mg 5.) Flüchtend penetrating .'Durchgangs-i · bohrungen'26 ^,.;., 26 * ·, over which the cavity 'S' between .frames .--

23 and - plate. 24 to the underside "A of the. 'Workplaces 3..ge- - ^{; is} open and is'in' connection with the area, i * ¹ the, at -der ^ c ^ eiibearb ^ eltiiKHg von Werlcs tu cköberf lachen Schlei- f * "- apply peering; The plate 24 is composed ^of: from bending and ver-- · '* -' torsion-proof iiaterialj zB'aus metal und'hierbei YW 'in part by way of steel or aluminum The -das-Unterteil'22. "-V-forming plate 2'4 contains on -ir -den / cavity -9 .abge -; - .. ^v turned plate a firmly connected with her, e.g." Terkleftsf "plate '2T" made of' elastic .. · material such as "rubber or synthetic -;>'substance' on the" remote dem''Hohlraum 9: Eläche * a sandpaper strip 5 (Fig. 5) rests', '' by means of the '' ^■■! the fixed to the frame 23 Klemmorgarie 6 x> ranges is kept interchangeable, wherein the "rigid, such as" metallic i plate 24, di ^{^:} elastic plate 27 and the Sohleifpäpier \ 5 aligned with one another each through holes 26, 26 ', 11, 11 «And lo, Io», which open the cavity - <9 * ■ '"between the upper part 21 and the lower part 22 to the ¹ " abrasive grain-bearing underside A of the abrasive paper 5 "' open * ' ^: '" ■■ '. · """- - ■ -; ■■ ·· ■ -; - -; "- '

At least one part of the through-hole eh lo, 11, 26, which is approximately right-angled to the sanding paper level 4 and which are "aligned with * -", has a shunt opening 28 ^ 28 *,

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which opens from an edge surface (edge edges 15, 16) of the lower part 22 into the through-hole Io, 11, 26, and in the side stream. from: the area of the end surfaces of the worktop 3 (arrows 29, 23 'in Pig. 5} leads to the associated through-hole. From Pig. 5 it can also be seen that the through-holes .. Io, 11, 26 and -Io% II ¹ , 26 'from the underside A loaded with sehlei shavings is sucked off (arrows 3o, 3ο ¹ ) »Both suction air flows 29, 3o, or 29', 3o 'mix in the passageway and run according to the suction in the direction of the arrows 31, 31 'towards the suction opening 12. In the exemplary embodiment shown, each through opening Ίο, 11, 26 or Io ^r , II ¹ , 26 ^{f has} a shunt opening 28, 28 * of this type to 5 can be seen, the lift lock openings 28, 2SV3eweils are provided on the "surface of the elastic plate 27 facing the sandpaper 5 between this plate and the sandpaper to the sandpaper h own in diverging planks. These shunt openings 28, 28 serve to suck up any sanding chips that may accumulate laterally next to the worktop 3 and at the same time to ensure that the adhesion between sandpaper 5 and the workpiece to be processed

surface as a result of the negative pressure in the through-holes Io, 11, 26 or Io · »II ¹ , 26 'does not become too strong.

■ - 12 -

009887/0942.

Claims (10)

A η s ρ r ■■ & : G -h'e ■■ - ly hand grinder with a drive motor contained in a housing, which sets a work surface, which is movably suspended on the housing, in an oscillating movement contained in one plane, which carries an abrasive on its underside, e.g. a sandpaper or abrasive cloth track, and with a suction device for suction. absorbent chips, characterized in that the worktop (3) is traversed by a cavity (9) which, on the one hand _, has several through openings (Io, 11, 26, lo ^f , II ¹ , 26 ) is open to the underside (A.) "of the worktop (3) and on the other hand is connected to a suction device via a suction opening (12). 2. Hand grinder according to claim 1, characterized in that that the suction device is part of the grinding device (l) and is driven by its drive motor. 3. Hand grinder according to claim 1, characterized in that that the suction device from one of the grinder (l) independently operated alien suction device exists that is connected to the suction opening (12) of the worktop (3) is connected via a flexible suction line (13), for example. . · ■■■■ ".-. - / - - 13 - ^: 009887/0942 4. Handheld grinding device according to one of claims 1 to 3, characterized in that the hollow mouth (9) extends essentially over the entire extent of the worktop (3) extends, for example in the case of an approximately cuboid Worktop (3) flat prismatic shape can own. 5. Hand grinder according to one of claims 1 to 4, characterized in that the through-openings, for example approximately at right angles to the plane of the sole paper (5) (lo, 11, 26) for an approximately cuboid Worktop (3) in two or three to Iiangsmittelaeh.se (14) of the worktop (3) symmetrical and to the in longitudinal edge edges (15, 16) of the worktop parallel lines (17, 18) and here within the Row arranged at the same distance from each other are. · 6. Hand grinder after one there; Claims 1 to 5, .. characterized in that the expedient in the rear ^ Area of the worktop and preferably on the top side facing away from the sandpaper, with the suction device connected suction opening (12) of the cavity (9) in the worktop (3) through the. . at right angles on the plane (4) of the sandpaper (5) standing longitudinal center plane of the worktop, where the longitudinal center plane is the plane of symmetry for the 009887/0942 " ¹⁴ " Forms suction opening (12) "." ■■■ · ■ ■ · 7. Hand grinder according to one of claims 1 to 6, 'characterized in that on the worktop (3) a The tubular connection piece (19) containing the suction opening (12) is attached, the connection to a suction line (13) is used. 8. Hand grinder according to one of claims 1 to 7, ■ characterized in that the worktop (3) is divided in a plane (2o) approximately parallel to the plane (4) of the sanding paper (5) and on the one hand one on the housing (2) of the The upper part (21) suspended from the sole device (l) and • on the other hand, a lower part (22) that is detachably connected to the upper part (21) in the dividing plane (2o), the upper part (21) consisting of an approximately box-shaped, · to the dividing plane (2o) open frame (23) with a to. P. There is a border indicating the dividing plane, through which the suction openings (12) pass upwards, while the lower part (22) rests on a free border of the frame (23) pointing to the dividing plane (2o). - ' ^J - flat plate (24) with the planar extent of the frame (23) essentially corresponding to the planar extent, which, with sealing of the cavity (9) contained between the frame and the plate, along the edge of the', frame (23) rests against this example by means of the frame upper side "(B) ago eingeführterSchrauben (idf releasable ' 009S87 / 0942 - 15 V is attached "bar and _{practical: a;} us bending and verwindungs'steifetn material, for example-is made of steel or aluminum, ■ - ,. _:: \ r ^ ■, · .- -..... 9 - Handsqhle _ifgerät: na oh "jAnsjgr.ucn 8 ,. dadur cn, g_eke nnzeiclmet ,. that- the one ^. _r I3jitjf3? {te3jU (p-2), Mldeaide plate (24): on its surface applied to the cavity (9) a-pit- her.-firmly connected, eg glued plate (27) made of elastic material, vrie .Rubber or - ICoplastic, contains, on. whose the cavity (9). A bgewand ten plane, a Sclileifpa-iiers.treifen (5) · rests, which _{is held easily exchangeable by means of the: Frame (23): he} fastened element organs (6), and that; the rigid, e.g. . metallic plate. (.24), -the "elastic. Had; (27).. And the sandpaper (5) aligned with each other. Durchgangsb.bohrungeii (Io "IX, 26 ,, lo",: II ¹ , 26 ') have -the plank space (9X between ... the upper part (2-1) and the lower part (22) to which the, grinding lc ; orn, wear. open the underside (A) of the sliver paper (5). ... ... ... 10.. Hand grinder according to Claim 8 or 9, characterized in that at least part of the plane (4) facing the sanding paper. approximately right-angled through bores (lo, 11, 26) has a lifting tube ₁ ^ opening (28, 28 ·), which opens from an edge surface (15, 16) of the lower part (22) into the Durcligangsbolirung and in the IT bypass. the area <3e: edge areas _: the-'working ruler (3) - - 16 009887/0942. extracted "fragrance leads to the assigned DurcligangslDohrung. · 00988.7 / 0942