EP3551379A1

EP3551379A1 - Dust cover for a cutting grinder

Info

Publication number: EP3551379A1
Application number: EP17809211.0A
Authority: EP
Inventors: Oliver Ohlendorf
Original assignee: Hilti AG
Current assignee: Hilti AG
Priority date: 2016-12-06
Filing date: 2017-11-16
Publication date: 2019-10-16
Anticipated expiration: 2037-11-16
Also published as: EP3332908A1; WO2018104018A1; EP3551379B1

Abstract

A dust cover (100) having: a flange (90) for attaching the dust cover (100) to a transmission extension housing (210) of a cutting grinder (200); a cover body (10) for at least partially covering a circular cutting disc (220) on both sides; and a suction connection (40) by means of which removed surface material (S) can be suctioned from the cover body (10), wherein the dust cover (100) has a depth stop (80) by means of which a cutting depth of the cutting disc (220) can be limited, wherein the depth stop (80) is mounted on the cover body (10) by means of a single arm bearing (81) on the flange side.

Description

"Dust hood for a cut-off machine"

The present invention relates to a dust hood with a flange for attaching the dust hood to a gear neck of a cutting grinder. The dust hood is equipped with a hood body for at least sections, covering both sides of a circular cutting disc and with a suction through which a background abrasion can be extracted from the hood body. The dust hood has a depth stop by means of which a cutting depth of the cutting disk can be limited.

Dust hoods of the type mentioned are basically known from the prior art. They serve to prevent dust spreading during cutting operations in order to protect the health of a user of the cut-off grinder.

It is an object of the present invention to provide a particularly easy-to-handle dust cover.

The object is achieved in that the depth stop is mounted via a Einarmlagerung flange side on the hood body.

The invention includes the realization that depth stops are mounted on dust hoods of the prior art on both sides of the hood body, which on the one hand increases the complexity, on the other hand the power requirement in the depth adjustment (caused by friction) and the space requirement. As a result, the dust hood according to the invention is particularly easy to handle.

In an advantageous development of the prior art, the depth stop of the dust hood is mounted on the flange side via a single-arm bearing, in particular exclusively on the flange side of the hood body. This results in a comparatively small space requirement on the one hand. In addition, a simpler structural design of the depth stop is possible, which can be reflected for example in lower costs. It has proved to be advantageous if the Einarmlagerung has a bearing ring which surrounds the flange annular. Such a bearing diameter of the Einarmlagerung can be kept relatively small in order to keep frictional forces low.

A comparatively small height of the dust hood can be achieved in particular by the fact that the clamping nut side, that is, the side opposite the flange side of the hood body, is free from storage. Preferably, this clamping nut side is free of a bearing ring.

It has proved to be advantageous if the connection flange is formed on the hood body. A drive spindle of the cutter can, when the dust hood is connected to the cutter and the cutting disc is accommodated in the dust hood, coaxially project through the flange.

It has proved to be advantageous if the depth stop is integrally formed with the Einarmlagerung and the bearing ring. The depth stop can be designed as a sector-shaped hood. Alternatively or additionally, the depth stop can be guided on an end face of the hood body and / or the depth stop can embrace an end face of the hood body at least in sections. It has proved to be particularly advantageous if the depth stop consists of plastic.

In a further preferred embodiment, the depth stop on a Lagearretierung. Thus, the depth stop, in a relative position relative to the dust hood, be locked. The Lagearretierung may have a built-in depth stop spring element. About this spring element, a snap and / or latching mechanism can be realized, via which a step adjustment of the cutting disc, for example, in 5-mm steps can take place. Alternatively, a stepless cutting depth adjustment of the cutting disc by means of Lagearretierung conceivable. Preferably, the spring element is functionally integrated in a depth stop made of plastic. The spring element can, in the undeflected state, be part of a surface of the depth stop.

It has proven to be advantageous if the depth stop is adjustable in height exclusively by twisting about the axis of rotation of the cutting disc. Preferably, the depth stop is free of a linear guide.

In a further preferred embodiment, a main suction channel connected to the suction connection is formed in the hood body, which preferably extends tangentially to the cutting disk. The Hauptabsaugkanal may be divided by a hood web into two suction chambers, which are preferably formed symmetrically to each other.

The object is also achieved by a power cutter with a gear neck, in particular an angle grinder, and with a dust hood of the type described above, wherein the dust hood is arranged or to be arranged by means of its flange on the gear neck. The fact that the depth stop on a Einarmlagerung flange on the hood body is stored, a storage of the depth stop between grinder and hood body is realized.

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. Show it:

Fig. 1 shows a preferred embodiment of a dust hood according to the invention in

Top view;

Fig. 2 is a clamping nut side view of the dust hood of FIG. 1 with flared

Depth stop;

3 shows the dust hood of FIGS. 1 and 2 with the cutting disc received;

4 shows the dust hood of FIGS. 1 to 3 arranged on a cut-off machine;

5 shows the depth stop of the dust hood of FIGS. 1 to 4;

6 is a side view of the dust hood of Figures 1 to 4 from the perspective of

Cut-off machine.

Embodiment:

A dust hood 100 according to the invention is shown in FIG. The dust hood 100 is provided with a flange for fixing the dust hood 100 to a gear train of a cutter (see Fig. 4). The dust hood has a hood body 10 for at least partially covering both sides of a circular cutting disk (cf., Fig. 3, cutting disk 220). Furthermore, the dust hood 100 has a suction connection 40 via the background removal, for example in the form of dust, from which the hood body 10 can be sucked off.

According to the invention, the dust hood 100 is equipped with a depth stop 80, which is mounted on the flange body side via a single-arm bearing 81, that is, on a flange side FS, on the hood body 10. As can be seen from Fig. 1, the storage takes place via a bearing ring 83, which surrounds the flange 90 in an annular manner. The bearing ring 83 is part of the Einarmlagerung 81 of the depth stop 80th

The connecting flange 90 is formed on the hood body. A drive spindle 230 of the cutter 200 (see Fig. 4) protrudes coaxially through the flange 90 when the dust hood 100 is connected to the cutter 200 and the cutter 220 is received in the dust hood 100.

1, and will be explained with reference to the other figures, the depth stop 80 with the Einarmlagerung 81 and the bearing ring 83 is integrally formed of plastic.

As can be seen particularly clearly from the plan view shown in FIG. 1, the depth stop 80 is mounted via its single-arm bearing 81 and in particular the bearing ring 83 exclusively on the flange side FS. The clamping nut side SP is free from storage, in particular a centric storage by means of a bearing ring.

2, the depth stop 80 is formed as a circular sector-shaped hood, which is guided on an end face 15 of the hood body and the end face 15 of the hood body 10 engages in sections. This wraparound in the periphery of the hood body 10 should not be understood in the context of the present invention, in particular not as storage, but rather as a guide. Thus, the dust hood 100 shown in Fig. 1 is also free of a linear guide.

A circular cutting disc not visible in FIG. 1 is driven in separating operation about the axis of rotation R in the direction of rotation DR. On the right side of Fig. 1 is clearly visible the suction port 40, which opens into a main suction channel 50 connected to it. The Hauptabsaugkanal extends in the tangential direction T to the cutting disc 220 (see also Fig. 2 and 3). The Hauptabsaugkanal 50 is divided by a hood web 20 into two suction chambers 30, 30 ', which are formed symmetrically to each other and improve the flow situation in the dust hood 100 in the course of a suction process.

FIG. 2 shows the dust hood 100 of FIG. 1 with a view of the clamping nut side SP. Housed in the dust hood 100 is a circular cutting disk 220 in the form of a diamond disk. This is set in separation mode via the drive spindle 230 in motion. The circular blade 220 is covered by the hood body 10 on both sides in sections. An uncovered part of the cutting disc 220 protrudes through a disc outlet opening 70 on the underside of the hood body 10 from the hood body 10 addition.

As can be seen from FIG. 2, the clamping nut side SP is free of any bearings, or free from the bearing ring 83 described with reference to FIG. 1. It can be clearly seen that the depth stop 80 partially engages an end face 15 of the hood body 10 and thereby is guided in the alternative.

Fig. 2 shows the zero position NP of the depth stop 80, that is, the cutting wheel 220 can be immersed in the ground maximum. Thus, a full cut is possible in which a substrate, not shown here, the disk outlet opening 70 preferably completely contacted.

In the upper region, the depth stop 80 has a Lagearretierung 87, which has an integrated into the depth stop 80 spring element 89 in the present embodiment shown. About this spring element 89, a continuous rotation of the depth stop 80 about the rotation axis R of the cutting wheel 220 is possible in the present case.

Fig. 3 serves to illustrate a Ausstellposition AP of the depth stop 80. For this purpose, first the depth stop 80 is shown in the zero position NP based on Fig. 2. In addition, a depth stop 80 'displayed in the deployed position AP is shown. In this context, it should be mentioned that the representation of FIG. 3 is to be understood only schematically. In fact, the deployed position AP shown in Fig. 3 and the zero position NP can not be taken simultaneously.

In its exposed position AP, the depth stop 80 projects beyond the window outlet opening in the direction of the substrate UG. Thus, a depth of cut of not shown here Cutting disc to be limited. By the co-displaced spring element 89 'of the depth stop 80 is held in its exposed position AP.

Fig. 4 shows the dust hood together with a cut-off machine 200 (abrasive grinder only partially shown). About the flange 90, not shown here, the dust cover 100 is connected to a Getriebehals 210 of the cutter 200. The bearing ring 83, which is not shown here, is located between the cut-off grinder 200 and the hood body 10. The clamping nut side SP is free from storage.

Finally, FIG. 5 shows the depth stop 80 of the dust hood of FIGS. 1 to 4. The depth stop 80 of FIG. 5 is designed as a sector-shaped hood and realizes a single-arm bearing 81 on the hood body 10 via the depth stop 80 (as shown, for example, in FIG. 1) can be connected.

As can be seen from Fig. 5, the depth stop 80 with Einarmlagerung 81, bearing ring 83 and Lagearretierung 87 together with integrated spring element 89 is integrally formed of plastic. This results in a particularly favorable manufacturing possibility. For example, the depth stop 80 shown in FIG. 5 can be manufactured by a one-step injection molding process. The sector region SB extending between the bearing ring 83 and an end region ST defines an "arm" of the one-arm bearing 81.

Finally, FIG. 6 shows the dust hood 100, connected to a cut-off machine 200, from the viewpoint of the cut-off wheel 200. The circular cut-off wheel 220, which is received on both sides in the hood body 10, rotates in the direction of rotation DR in the separation mode, in the case of FIG. 6 this means one direction of rotation DR clockwise.

LIST OF REFERENCE NUMBERS

10 hood body

20 hood web

30, 30 'suction chambers

50 main suction channel

70 disc outlet opening

80 depth stop

81 Einarmlagerung

83 bearing ring

87 Lagearretierung

89 spring element

90 flange

100 dust hood

200 cutters

210 transmission neck

220 grinding wheel

230 drive spindle

AP Release position of the depth stop DR Direction of rotation of the grinding wheel

FS flange side

R axis of rotation of the grinding wheel

NP zero position of the depth stop

SP clamping nut side

SB sector area

ST forehead area

T tangential direction

Underground underground

Claims

claims

Dust hood (100) with a flange (90) for attaching the dust cover (100) to a gear neck (210) of a cutting grinder (200), and with a hood body (10) for at least partially covering both sides of a circular cutting disc (220), and with a suction connection (40) via which a background removal from the hood body (10) can be sucked off, wherein the dust hood (100) has a depth stop (80) by means of which a cutting depth of the cutting disc (220) can be limited

characterized in that the depth stop (80) via a Einarmlagerung (81) on the flange side of the hood body (10) is mounted.

Dust hood (100) according to one of the preceding claims,

characterized in that the Einarmlagerung (81) has a bearing ring (83) which surrounds the flange (90) annular.

Dust hood (100) according to one of the preceding claims,

characterized in that the connecting flange (90) is integrally formed on the hood body (10).

Dust hood (100) according to one of the preceding claims,

characterized in that the depth stop (80) with the Einarmlagerung (81) and the bearing ring (83) is integrally formed.

Dust hood (100) according to one of the preceding claims,

characterized in that the depth stop (80) is designed as a circular sector-shaped hood.

Dust hood (100) according to one of the preceding claims,

characterized in that the depth stop (80) on an end face (15) of the hood body (10) is guided and / or the depth stop (80) an end face (15) of the hood body (10) at least partially surrounds.

7. Dust hood (100) according to one of the preceding claims,

characterized in that the depth stop (80) consists of plastic.

8. Dust hood (100) according to one of the preceding claims,

characterized in that the depth stop (80) has a Lagearretierung (87), in particular a in the depth stop (80) integrated spring element (89).

9. Dust hood (100) according to one of the preceding claims,

characterized in that the depth stop (80) is height adjustable exclusively by rotation about the axis of rotation (R) of the cutting disc (220).

10. Dust hood (100) according to one of the preceding claims,

characterized in that the depth stop (80) is free of a linear guide.

1 1. Dust hood (100) according to one of the preceding claims,

characterized in that in the hood body (10) connected to the suction port (40) Hauptabsaugkanal (50) is formed, which extends tangentially to the cutting disc (220).

12. Dust hood (100) according to one of the preceding claims,

characterized in that the Hauptabsaugkanal (50) by a hood web (20) into two suction chambers (30, 30 ') is divided, which are preferably formed symmetrically to each other.

13. A cutting grinder (200) with a gear neck (210) and with a dust hood (100) according to one of the preceding claims, wherein the dust hood (100) by means of its flange (90) on the gear neck (210) is arranged or to be arranged.