EP3300839A1 - Dust hood for a grinding machine - Google Patents

Abstract

A dust hood (100) for a grinder (200) equipped with a gear neck (210) for mounting the dust hood (100), with a hood body (10) for covering a circular grinding wheel (220) and along a circumference (U) of the hood body (10) running curtain (30) for at least partially sealing the hood body (10) relative to a by means of the grinding wheel (220) to be machined substrate (UG), and with a suction port (40) via which a Untergrundabtrag from the hood body (10) sucked can be, wherein the dust hood (100) has a collar (50) by means of which the hood body (10) relative, preferably in the axial direction (A) relative to the axis of rotation (R) of the grinding wheel (220), with respect to the transmission neck (210). and / or the adjusting ring (50) can be adjusted.

Description

The present invention relates to a dust hood for a equipped with a Getriebehals for attaching the dust hood grinder. The dust hood is equipped with a hood body for covering a circular grinding wheel and with a curtain running along a circumference of the hood body for at least partially sealing the hood body with respect to a substrate to be machined by means of the grinding wheel. The dust hood has a suction connection, via which a background removal can be sucked out of the hood body.

Dust hoods of the type mentioned are basically known from the prior art. They serve to prevent the spread of dust during grinding work, inter alia to protect the health of a user of the grinder. It is known to provide the hood body with a curtain in the form of a brush ring or a lamellae curtain, so that the hood body terminates on the substrate to be processed. If the angle grinder is placed slightly obliquely on the substrate to be processed, then the curtain can seal a gap which may arise between the hood body and the substrate to be machined, whereby extraction of dust typically proceeds optimally if there is a gap of 1 between the brush ring or the slatted curtain and the substrate to 2 mm.

It is an object of the present invention to provide a dust hood which offers improved possibilities of use.

The object is achieved in that the dust hood has a collar by means of which the hood body relative, preferably in the axial direction relative to the axis of rotation of the grinding wheel, with respect to the gear neck and / or the adjusting ring can be adjusted.

The invention includes the recognition that a grinding wheel typically loses about 8 mm over its service life, and accordingly, for optimal extraction of dust, a height of the brush ring / slatted curtain should be adjustable.

The invention also includes the recognition that dust hoods known from the prior art either do not use any height adjustment or rubber lips which press the brush ring or Lammellenvorhang against the ground. Both lead to one Heavy wear on these same elements, so that the bust ring or Lammellenvorhang typically has to be changed with each grinding wheel. In addition, the suction result is not optimal when the bust ring or Lammellenvorhang rests because at the point no air can flow.

In departure from the dust hoods known from the prior art, the dust hood according to the invention can be adapted to the actual state of a grinding wheel. Thus, a dust hood is provided, which offers an improved use.

In a preferred embodiment, the curtain is designed as Lammellenvorhang. Alternatively, the curtain may be formed as a brush ring or as a brush.

It has proved to be advantageous if the adjusting ring comprises a guide neck formed on the hood body from the outside. The adjusting ring may have a handle to facilitate operation of the adjusting ring.

In a further preferred embodiment, the hood body has a central opening through which the gear neck can protrude. Through the Getriebehals a drive spindle is preferably performed, to which the circular grinding wheel is to be mounted for grinding operation.

Particularly preferably, an adjusting thread with a thread pitch is formed on the inside of the adjusting ring, which is in engagement with a corresponding adjusting thread, which is formed on the outside of the guide neck. The engagement is preferably designed such that a rotation of the adjusting ring about the axis of rotation causes a raising or lowering of the hood body relative to the gear neck and / or the hood body relative to the adjusting ring. Preferably, the adjusting thread and the corresponding adjusting thread are formed as a trapezoidal thread.

According to an alternative embodiment, it may also be possible that the adjusting thread is fixedly or stationarily connected to the transmission neck, so that the adjusting ring moves together with the hood body relative to the transmission neck.

In a preferred embodiment, the dust hood on a preferably U-shaped Umgriff-piece. The wrap-around piece can be designed to engage around a retaining collar formed on the adjusting collar to secure the adjusting ring on the gear neck. Particularly preferably, the Umgriff-piece engages with a proper arrangement of the dust hood on the grinder, a trained on Getriebehals housing collar. Especially Preferably, the collar, positively in the axial direction, connected to the transmission neck of the grinder.

Preferably, the Umgriff-piece is transverse to the axis of rotation, preferably perpendicular, arranged removable from the gear neck. This facilitates disassembly of the dust hood, for example for cleaning purposes. The wrap-around piece can be secured against removal from the gear neck by at least one retaining screw, preferably exactly two retaining screws. Alternatively or additionally, the wrap-around piece can be secured by a lock against removal from the gear neck. The lock may be formed for example as a spring-loaded pushbutton or as a pawl with snap hooks. In addition, the lock can also be formed by rivets, pins or the like.

The hood body can be infinitely adjustable. Alternatively, the hood body can be graduated adjustable. For this purpose, a preferably spring-loaded latching plunger and / or on the gripping piece a plurality of recesses may be provided on the adjusting ring, each corresponding to a height level.

It has been found to be advantageous if the hood body is adjustable by turning the adjusting ring by about 180 degrees, from an upper hood position to a lower hood position and vice versa, the upper and lower hood positions each defining a stop.

It has been found to be particularly advantageous if at least one threaded recess is provided in the thread of the adjusting thread. The thread of the adjusting thread may be formed as an interrupted thread. This makes it easier to knock off unwanted dust crusts. Alternatively or additionally, at least one core recess is provided between two adjacent threads of the corresponding adjusting thread. The core recess is preferably formed as a through hole to the interior of the guide neck. This advantageously makes it possible to remove dust from the thread.

Particularly preferably, the dust hood on a curtain carrier, with which the curtain can be fixedly connected. It has proved to be advantageous if the curtain carrier has a locking bush, which can be engaged in the hood body. Particularly preferably, the locking bushing has at least one bushing slot which can extend parallel to the axis of rotation and preferably at least partially overlaps with the core recess. Thus, a discharge of dust from the thread is further improved.

In a particularly preferred embodiment, the hood body is designed to cover a major part of the grinding wheel. The dust hood may comprise a hood sector slidable in the circumferential direction of the hood body along the hood body, which sector is provided for gradually covering and releasing, as required, a remaining part of the grinding wheel. This allows a separation operation by means of the remaining part of the grinding wheel, which is not covered by the hood body.

Preferably, the curtain is fixedly connected to the hood body. The dust cover may be free of any acting between the curtain and hood body in the axial direction spring elements.

The object is also achieved by a grinding device with a gear neck and with a dust hood of the type described above, wherein the dust hood is arranged or to be arranged on the gear neck.

Further advantages will become apparent from the following description of the figures. In the figures, various embodiments of the present invention are shown. The figures, the description and the claims contain numerous features in combination. The skilled person will conveniently consider the features individually and summarize meaningful further combinations.

In the figures, identical and similar components are numbered with the same reference numerals.

Fig. 1

ein Schleifgerät in Form eines Diamantschleifers an dem eine Staubhaube gemäß eines bevorzugten Ausführungsbeispiels der Erfindung angeordnet ist, wobei die Staubhaube im Schnitt dargestellt ist;

Fig. 2

eine perspektivische Darstellung des Ausführungsbeispiels der Fig. 1;

Fig. 3

eine Vorderansicht des Ausführungsbeispiels der Fig. 1 und 2;

Fig. 4

die Staubhaube der Fig. 1 bis 3 in der oberen Haubenposition, wobei das Schleifgerät nur ausschnittsweise dargestellt ist;

Fig. 5

die Staubhaube der Fig. 1 bis 4 in der unteren Haubenposition, wobei das Schleifgerät nur ausschnittsweise dargestellt ist;

Fig. 6

die Staubhaube der Fig. 1 bis 5 in abgenommen Zustand, wobei das Schleifgerät nur ausschnittsweise dargestellt ist;

Fig. 7

die Staubhaube der Fig. 1 bis 6 in teilweise geöffnetem Zustand, wobei das Schleifgerät nicht dargestellt ist; und

Fig. 8

eine bevorzugte Ausgestaltung des Stellrings und des Umgriff-Stücks.

Show it:

Fig. 1

a grinder in the form of a diamond grinder on which a dust hood according to a preferred embodiment of the invention is arranged, wherein the dust hood is shown in section;

Fig. 2

a perspective view of the embodiment of Fig. 1 ;

Fig. 3

a front view of the embodiment of the Fig. 1 and 2 ;

Fig. 4

the dust hood of the Fig. 1 to 3 in the upper hood position, the grinder is only partially shown;

Fig. 5

the dust hood of the Fig. 1 to 4 in the lower hood position, the grinder is only partially shown;

Fig. 6

the dust hood of the Fig. 1 to 5 in detached state, the grinder is only partially shown;

Fig. 7

the dust hood of the Fig. 1 to 6 in a partially opened state, wherein the grinder is not shown; and

Fig. 8

a preferred embodiment of the adjusting ring and the Umgriff-piece.

Embodiment:

Fig. 1 shows a grinder 100 in the form of a diamond grinder. The grinder 200 has a gear neck 210 for attachment of a dust hood 100, which is also in Fig. 1 is shown. For reasons of clarity, the dust hood 100 is shown in section.

The dust hood 100 is equipped with a hood body 10 for covering a circular grinding wheel 220, in the present case a diamond disk, and with a curtain 30 running along a circumference U of the hood body 10 for at least partially sealing the hood body 10 against a substrate UG to be machined by means of the grinding wheel 220 , The curtain 30 is designed as a slatted curtain.

Via a suction connection 40 of the dust hood 100, a background removal S in the form of dust can be extracted from the hood body 10.

The hood body 10 in Fig. 1 is designed to cover a major part of the grinding wheel 220, wherein dust hood 100 has a cover sector 20 which is displaceable in the circumferential direction U of the hood body 10 along the hood body 10, which is provided for the gradual covering and releasing of a remaining part 220 'of the grinding wheel 220 as required. In hood sector 20, a curtain 30 'is also provided in the form of a louver curtain. By releasing the remaining part 220 'of the grinding wheel 220, it is also possible to grind on a vertical wall.

According to the invention, the dust hood 100 has an adjusting ring 50 by means of which the hood body 10 can be adjusted in the axial direction A, relative to the axis of rotation R of the grinding wheel 220, with respect to the gear neck 210 and the adjusting ring 50.

The adjusting ring 50 is positively connected in the axial direction A with the gear neck 210 of the grinder 200. This is achieved by a U-shaped Umgriff-piece 25 (see also Fig. 6 and 8th ), which surrounds a collar 50 formed on the retaining collar 55 for securing the adjusting ring 50 on the gear neck 210. At in Fig. 1 shown designated arrangement of the dust hood 100 on the grinder 200 surrounds the Umgriff-piece 25 also formed on the gear neck 210 housing collar 215th

The hood body 10 has a central opening 13 through which the gear neck 210 can pass or protrude. Through the gear neck 210, a drive spindle (not shown) is guided on which the circular grinding wheel 220 is mounted for grinding operation.

In the following, the adjustability of the hood body 10 will be explained in more detail. How out Fig. 1 it can be seen, the adjusting ring 50 comprises a guide neck 15 formed on the hood body 10 from the outside.

On the inside of the adjusting ring 50, an adjusting thread 57 with a pitch G is formed (see. Fig. 7 ), which is in engagement with a corresponding adjusting thread 17, which is externally formed on the guide neck 15. It is thus achieved that a rotation of the adjusting ring 50 about the rotation axis R causes a raising or lowering of the hood body 10 relative to the gear neck 210 and the hood body 10 relative to the adjusting ring 50.

Fig. 2 shows a perspective view of the embodiment of Fig. 1 , Good to recognize in Fig. 2 is that the collar 50 has a handle 53 to facilitate operation of the adjusting ring 30.

The hood body 10 is rotated about 180 degrees by turning the adjusting ring 50 from an upper hood position OP (FIG. Fig. 1 to Fig. 4 ) into a lower hood position UP ( Fig. 5 ) and vice versa, wherein the upper and lower hood position each define a stop. In Fig. 2 an upper hood position OP of the hood body 10 is shown, which is why the grinding wheel 220, with respect to the axial direction A, projects beyond the hood body 10 at most.

A front view of the embodiment of Fig. 1 and 2 is in Fig. 3 shown.

Fig. 4 now shows the dust hood the Fig. 1 to 3 in the upper hood position OP, wherein the grinder 200 is only partially shown. Good to see is the U-shaped Umgriff-piece 25th

Fig. 5 shows the dust hood of the Fig. 1 to 4 in the lower hood position UP, wherein the grinder is also shown only in part. Below the adjusting ring 50 can be seen a part of the corresponding adjusting thread 17 which is formed on the outside of the guide neck 15.

The dust hood of the Fig. 1 to 5 in removed condition is in Fig. 6 shown, wherein the grinder 200 is shown only partially. The wrap-around piece 25, which is designed to be vertically removable with respect to the rotation axis R from the gear neck 210, is in Fig. 6 shown in withdrawn state. Two retaining screws 27, which are provided for securing the wraparound piece 25 against removal from the gear neck 210, are hereby solved. According to an alternative embodiment, the two retaining screws 27 may also be designed in the form of two retaining pins. Moreover, it is also possible that the two retaining screws 27 are also realized by two rivets.

Good to recognize in Fig. 6 are formed on the collar 50 retaining collar 55 and formed on the gear neck 210 housing collar 215, which are held with mounted Umgriff-piece 25 in the axial direction A positively by the Umgriff-piece 25, wherein the collar 50 rotatably remains.

The hood body 10 has a central opening 13 through which the gear neck 210 can pass or protrude. Through the gear neck 210 a drive spindle 230 is guided, to which the circular grinding wheel (not shown) can be attached for grinding operation. To recognize on the upper inside of the adjusting ring 50 is a part of the adjusting thread 57, which is formed on the inside of the guide neck 15.

In Fig. 7 shown is the dust cover 100 of Fig. 1 to 6 in partially open condition, the grinder is not shown. In Fig. 7 In particular, a measure for the effective extraction of background abrasion (dust) can be seen.

So is between each two adjacent threads 16, 16 '; 16 ', 16 "of the corresponding adjusting thread 17 are each provided with a core recess 18, 18' The core recesses 18, 18 'are formed as through-holes to the interior of the guide neck 15. Through the core recesses 18, 18', dust can be sucked out of the corresponding adjusting thread 17 ,

Again Fig. 7 can be removed below, the dust cover 100 on a curtain carrier 60 to which the curtain 30 is fixedly connected, wherein the curtain carrier 60 has a locking sleeve 65 which can be engaged in the hood body 10 and the guide neck 15. The locking bush 65 has in the presently illustrated embodiment six socket slot 67 which extend parallel to the axis of rotation R. The curtain carrier 60 and the dust hood 10 can be plugged together such that one of the socket slots 67 at least partially overlaps with the core recess 18. This allows optimal dust extraction from the corresponding adjusting thread 17th

Fig. 8 Finally, shows a preferred embodiment of the adjusting ring 50 and the Umgriff piece 25. For the purpose of graded height adjustment of the hood body (not shown), a preferably spring-loaded latching ram 59 is provided on the adjusting ring 50. A plurality of recesses 29, 29 ', 29 ", which correspond in each case to a height step, are formed on the wrap-around piece 25 Fig. 8 it can be seen, a plurality of threaded recesses 58 are provided in the thread 56 of the adjusting thread 57, which define an interrupted thread 56. This makes it easier to knock off unwanted dust crusts.

LIST OF REFERENCE NUMBERS

10

hood body

13

central opening

15

guide neck

16, 16 ', 16 "

adjacent threads of the corresponding adjusting thread

17

corresponding adjusting thread

18, 18 '

Kernausnehmung

20

sliding hood sector

25

Wraparound piece

27

retention screw

29, 29 ', 29 "

recesses

30, 30 '

curtain

40

suction

50

collar

53

grip

55

retaining collar

56

Thread of the adjusting thread

57

adjusting thread

58

threaded recess

59

Rest ram

60

curtain carrier

65

locking bush

67

female slit

100

dust cap

200

sharpener

210

transmission neck

215

housing collar

220

grinding wheel

220 '

remaining part of the grinding wheel

230

drive spindle

A

axial direction

G

Thread

operating room

upper hood position

R

axis of rotation

S

Untergrundabtrag

U

Circumference or circumferential direction

UG

underground

UP

lower hood position

Claims (16)

A dust hood (100) for a grinder (200) equipped with a gear housing (210) for mounting the dust hood (100), with a hood body (10) for covering a circular grinding wheel (220) and along a circumference (U) of the hood body (10) running curtain (30) for at least partially sealing the hood body (10) relative to a by means of the grinding wheel (220) to be processed substrate (UG), and with a suction port (40) via a subsurface (S) from the hood body ( 10) can be sucked off,
characterized in that the dust hood (100) has an adjusting ring (50) by means of which the hood body (10) relative, preferably in the axial direction (A) with respect to the axis of rotation (R) of the grinding wheel (220), with respect to the transmission neck (210) and / or the adjusting ring (50) can be adjusted. Dust hood (100) according to claim 1,
characterized in that the adjusting ring (50) comprises a cap body (10) formed on the guide neck (15) from the outside. Dust hood (100) according to claim 2,
characterized in that on the inside of the adjusting ring (50) is an adjusting thread (57) with a pitch (G) is formed, which with a corresponding adjusting thread (17) which is externally on the guide neck (15) is engaged, such that a rotation of the adjusting ring (50) about the rotation axis (R) causes a raising or lowering of the hood body (10) relative to the gear neck (210) and / or the hood body (10) relative to the adjusting ring (50). Dust hood (100) according to one of the preceding claims,
characterized in that the dust cap (100) has a preferably U-shaped throwing-piece (25) that an adjustment ring (50) surrounds formed support collar (55) for securing the positioning ring (50) on the gearbox neck (210), the wraparound piece (25), when the dust hood (100) is disposed on the grinding device (200) as intended, likewise encompasses a housing collar (215) formed on the gear neck (210). Dust hood (100) according to claim 5,
characterized in that the Umgriff-piece (25) with respect to the axis of rotation (R) transversely, preferably vertically, removable from the gear neck (210) is arranged. Dust hood (100) according to claim 5,
characterized in that the wraparound piece (25) is secured by at least one retaining screw (27) and / or locking against removal from the gear neck (210). Dust hood (100) according to one of the preceding claims,
characterized in that the hood body (10) is infinitely adjustable. Dust hood (100) according to one of claims 1 to 6,
characterized in that the hood body (10) is stepped adjustable, wherein on the adjusting ring (50) has a preferably spring-loaded latching plunger (59) and the wraparound piece (25) has a plurality of recesses (29, 29 ', 29 "), the each corresponding to a height level, is provided. Dust hood (100) according to one of the preceding claims,
characterized in that the hood body (10) is adjustable by turning the adjusting ring (50) about 180 degrees from an upper hood position (OP) to a lower hood position (UP) and vice versa, the upper and lower hood positions (UP; OP) define one stop each. Dust hood (100) according to claim 1 or 2,
characterized in that the adjusting ring (50), in the axial direction (A) positively, with the gear neck (210) of the grinder (200) is connected. Dust hood (100) according to one of claims 3 to 10,
characterized in that in the thread (56) of the adjusting thread (57) at least one threaded recess (58) is provided and / or between two adjacent threads (16, 16 ') of the corresponding adjusting thread (17) at least one core recess (18) is provided. Dust hood (100) according to one of the preceding claims,
characterized in that the dust hood (100) has a curtain carrier (60) to which the curtain (30) is fixedly connected, wherein the curtain carrier (60) has a locking bush (65) which can be engaged in the hood body (10). Dust hood (100) according to claims 11 and 12,
characterized in that the locking bushing (65) has at least one bushing slot (67) which extends parallel to the axis of rotation (R) and at least partially overlaps with the core recess (18). Dust hood (100) according to one of the preceding claims,
characterized in that the hood body (10) for covering a major part of the grinding wheel (200) is formed and the dust hood (100) in a circumferential direction (U) of the hood body (10) along the hood body (10) slidably hood sector (20) which is provided for gradually covering and releasing, as required, a remaining portion of the grinding wheel (220), and wherein a hood (30 ') is also provided in the hood sector (20). Dust hood (100) according to one of the preceding claims,
characterized in that the curtain (20) fixed with the cap body (10) and the dust cap (100) is free of any between the curtain (20) and cover body (10) in the axial direction (A) acting spring elements. Grinding apparatus (200) with a gear housing (210) and with a dust hood (100) according to any one of the preceding claims, wherein the dust hood (100) on the gear neck (210) is arranged or to be arranged.

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