DE2359714A1 - Safety hood for hand grinders - capture cone for thrown off dust particles is fixed to safety hood close to disc operating point - Google Patents

Abstract

Safety hood for parting discs on hand grinders, especially angle grinding machines, with two segment-shaped walls which cover the disc sides and with an arc-shaped wall which connects the side walls. A captive cone for thrown off dust particles, which can be connected to a container is fixed to the safety hood close to the operating point of the parting disc. The captive cone can be connected via a suction line with a container which can be under vacuum. Specifically, the cone is connected with a bag of air-passing material to allow the air picked up from the disc to escape.

Description

DR.-ING. DIPL.-ΙΝβ. M. SC. DH "L.-PHYS. DR. DIFL.-PHYS.

HÖGER - LEGAL RIGHTS - GRiESSBACH -HAECKER

PATENT LAWYERS IN STUTTGART

A'40 421 m.

u - 160

19th November 1973

company
. Ackermarin &'Schmitt KG

7000 Stuttgart 1
Raitelsbergstrasse 4 9

Protective cover for cutting blades on hand grinders

The invention relates to a protective hood for cutting discs Hand grinders, especially angle grinders, with two essentially segment-shaped walls laterally covering the cutting disk and one connecting these walls arched wall.

It is known to cut through stone-like materials such. B Use slab or tile cut-off machines. A fast rotating, narrow cut-off wheel is used for these guided through the material and a severing cut in

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this ground in. In known, hand-operated cut-off machines, the cut-off wheel is for safety reasons covered by a protective hood that covers about half of the cutting disc.

When the cut is ground into the material, small particles of material are carried away by the rapidly rotating cutting disc and thrown off tangentially from this disk shortly after the job. When cutting plaster of paris, Marble, pressed stone or the like. The cut particles are possibly so small that they are spun off remain dispersed by the cutting disc as fine dust in the air. This makes working conditions difficult. In addition, health hazards are possible through inhalation of this dust. Finally, the hurled Particle z. B. cause injuries in the eyes of an operator. That being said, it can get severe Deposit particles in an obstructive manner at the work or interface.

It is the object of the invention to propose a hand grinder, in which the particles of material that are thrown off the cutting disc, some of which are similar to dust, are not unhindered can fly into space.

This object is achieved in that a container is attached to the protective hood in the vicinity of the work place of the cutting disk connectable collecting funnel for thrown off Dust particles is attached.

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The following description of a preferred embodiment the invention is used in connection with the drawing for a more detailed explanation. Show it:

Fig. 1 is a side view of an angle grinder;

FIG. 2 is a sectional view taken along line 2-2 in FIG. 1

and

Figure 3 is a partial plan view of the machine.

In Fig. 1 is a known, hand-operated angle grinder 1, the cutting disc 2 of which is covered by a protective hood 3 .: This consists of two the Separating disk 2 laterally covering protective walls 4 and 5, both of which are surrounded by an arched wall 6 on their outer edge are connected to each other. This connection can, 'as it is in 1 and 2 is shown, can be achieved by that both protective walls 4 and 5 are provided with bent edges which, similar to a can with the corresponding lid, overlap each other.

The protective walls 4 and 5 extend over the upper half of the cutting disc 2. In the area of the rotating shaft of the Winkelschlexf machine they have a semicircular recess 8 on, which gives access to the attachment of the cutting disc on the Shaft of the angle grinder facilitated. With the aid of a protective wall 4 adjacent to the angle grinder 1 connected clamp 7 can the protective hood 3 on the angle grinder 1 can be attached.

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In Fig. 1, the direction of rotation of the cutting disc 2 is through the arrow A and the job in which the cutting disc 2 penetrates the material, marked 11. On the The side of the protective hood 3 towards which the cutting disk 2 is moving - that is to say on the right-hand side in FIG. 1 - is in accordance with FIG the invention attached a collecting funnel 9 for the thrown off dust particles. The longitudinal axis of this collecting funnel 9 is preferably arranged approximately in such a way that it extends the outer edge of the cutting disk 2 in the vicinity of the work station 11 touched tangentially. The collecting funnel 9 has two openings, a larger opening or mouth facing the cutting disc 12 and a smaller opening facing away from the cutting disk 2

To attach the collecting funnel 9 to the protective hood 3, a U-shaped profile part 14 is arranged on its underside, its SchenkeiHTnaie side protective walls 4 and 5 and its web 17 merge into the arcuate wall 6 of the protective hood. The web 17 has one of the mouth 12 of the Collecting funnel 9 corresponding recess 18. On the The outside of the U-shaped profile part 14 is the collecting funnel 9 connected to the web 17 so that the mouth 12 of the collecting funnel 9 and the recess 18 in the web 17 to Get cover.

The smaller opening 13 of the collecting funnel 9 is with a Line, e.g. B. a suction line 19 connected. The ones in the

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Collecting funnel 9 thrown dust particles can through this Saugleitüng 19 sucked and transported into a collecting container.

The collecting funnel can also be connected directly to a container be under negative pressure.

In a further embodiment, the opening 13 of the collecting funnel is directly connected to a container, in particular one Sack, connected, which consists of an air-permeable material, e.g. B. made of paper, foam rubber, textiles or the like .. The Dust particles thrown off the cutting disc are collected in this sack; because of the fast rotating cutting disc also entrained a lot of air and into the collecting funnel 9 is pressed, it is necessary to use the collecting container in the described. Way to make air-permeable. Otherwise a back pressure of air would form in the collecting funnel 9, so that the dust particles thrown off under certain circumstances would no longer get into the interior of the collecting funnel 9.

The arrangement of the collecting funnel 9 on the protective hood 3, the size of the mouth 12 facing the cutting disc 2 and the inclination of the collecting funnel 9 are chosen so that the Particles thrown off by the cutting disc 2, regardless of the diameter of the cutting disc 2, into the interior of the collecting funnel 9 arrive. This ensures that even when used Cutting discs whose diameter is noticeably smaller than that of new cutting discs, the dust particles perfectly through the

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Collecting funnel 9 are collected.

The underside of the U-shaped profile part 14 serves as a Bearing block on which, rotatable about a horizontal axis 21, a support 22 is mounted. By means of one at the free end of this Support 22 rotatably mounted, arcuate retaining bracket 23, this support 22 can be locked. This is in the bracket a longitudinally extending slot 24 is provided through which opposite the work site 11, one radially through the arcuate one Wall 6 inserted screw 25 protrudes. With the help of a wing nut 26 screwed onto this screw 25, the Retaining bracket 23 pressed against the arched wall 6 and thereby secured against displacement occurring along the slot 24 will.

The support 23 is used to guide the hand grinder resting on the material to be cut. To the support surface to enlarge, the edition 22 z. B. be expanded laterally by a support bracket 27 (Fig. 3). By adjusting of the retaining bracket 23, the support 22 is pivoted about the axis. The distance from the lower edge of the changes Cutting disc 2 for support 22, that is, it changes the cutting depth. By adjusting the bracket 23 it is possible to define the depth of a cut to be made.

Although the position of the job 11 is also reflected in this little changed, the collecting funnel 9 is designed and positioned so that the dust particles thrown off by the cutting disc 2 in each case into the interior of the collecting funnel 9 arrive.

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Claims (1)

23597H A 40 421 m u - 160 19th November 1973 P a te η ta η s-p; r ü ,, c h e:% M. Protective cover for cutting discs on hand grinders, ^ - ^ especially angle grinders, with two the cutting disc laterally covering, essentially segment-shaped protective walls and one of these protective walls. binding arched wall, as you know right show that on the protective hood (3) in the Near the work place (11) of the cutting disc (2) a collecting funnel (9) can be connected to a container for thrown off Dust particles is attached. ' • 2. Protective hood according to Claim 1, characterized in that the Collecting funnel (9) via a suction line (19) with a Container is connected. 3. Protective hood according to claim 1, characterized in that; the collecting funnel (9) with a vacuum Container is connected. 4. Protective hood according to claim 1, characterized / characterized in that the Äuffangtrichter (9) is connected to a sack from air-permeable material exists in order to allow the Euft entrained by the cutting disc (2) to escape. ■■ "- ■■■" ■ "-. '■ .- ■ - 2 - 50 98 23/0148 A 40 421 m u - 160 19th November 1973 5. Protective hood according to one of the preceding claims, characterized in that at the mouth (12) of the collecting funnel (9) a U-shaped profile part (14) is arranged, the legs (15, 16) of which in the lateral Protective walls (4, 5) and its web (17) provided with a recess (18) in the arched wall (6) of the protective hood (3) skip. 6. Protective hood according to one of the preceding claims, characterized characterized in that on the collecting funnel (9) a support (22) which is adjustable relative to the cutting disc (2) is provided. 509823/0146 L eer s eite