EP1136181B1 - Single-handed grinding device - Google Patents

Abstract

A grinding machine 1 can be operated with just one hand because all safety- , control- and regulator devices are correlated to the top handle 3 and are therefore easy to be operated. This is for one the holding clamp 14 as the on/off switch as well as the speed setting feature 2 which can be swiveled and which slightly juts out. Left- and right-handed users with different size hands can make easy adjustments so that a high comfort level for the user is reached.

Description

The invention relates to a portable grinder with housing, on the front a grinding tool driven by a rotor and at the back Holding head is arranged, the grinder with a speed controller is equipped, via which the rotational speed by means of a speed setting is adjustable (see e.g. US-A-6 004 197).

Grinding machines are used to coat, varnish and paint Remove surfaces of different objects and are made of, for example known from EP 0 577 575 or DE-PS 39 33 885. A possible area of application for these grinders is removing paint from the outside surface of Vehicles, with the aim of having the uneven contours of such a vehicle a grinder. Portable devices are used by the user grabs with one hand and touches the surface. Regulating the speed, with regard to the most varied of tasks, even for one Object must be changed several times, depending on whether, for example, over the entire area or working on chamfers or in throats is done via a speed controller, which can be operated with the second hand. To adjust the speed the device must usually be discontinued, since the grinder is located on the Surface pressure is not maintained constantly when regulating the speed leaves, so that damage to the surface cannot be excluded. In many known grinding machines, the switch for speed regulation is located even below the palm. Another disadvantage of known devices is that that holding heads in different sizes are used for different users and must be replaced accordingly. This applies in particular to legal or left-handed as well as for the usually different hand sizes of men and women. These at least four basic settings are satisfied, that the holding heads or the handles are designed to be interchangeable, so that each user can fall back on the more or less suitable holding head. Indeed some effort is required to do this since the device has a new holding head must be equipped and this must also be secured accordingly.

The object of the present invention is therefore a portable grinding device to create, the speed of which is easy and without stopping the Grinding device can be regulated from the surface of the object and that without expensive Conversion work can be used by different operators.

The object of the invention is achieved in that the speed setting about an axis running essentially perpendicular to the grinding tool is pivotable and is assigned to the upper edge of the holding head. Thereby one-hand operation of the grinder is possible for the user. With the palm of your hand the bale is gripped on the back of the device, while with the fingers, especially the index or middle finger Speed setting is actuated. This is pivoted on the top Edge of the holding head arranged. The speed setting is one in Axis that can be pivoted essentially vertically to the grinding tool, ie ultimately around the axis in the direction of which the user exerts the force on the grinder or tool. The speed can change during the grinding process is continuously varied and adapted to the circumstances, depending on the whether the grinding tool is over the entire surface, with a part of its surface or just about is used on an edge. Because with one hand both the pressure on the grinding tool or the surface to be worked, as well as the speed is set, a particularly uniform and safe processing is possible. Abrupt jerky movements while pressing the grinder onto the Surface that inevitably occurred when the speed was adjusted with the second hand are therefore excluded.

The grinder is particularly easy to handle if the Speed setting of the holding head in a one-hand operation of the holding head and enable speed adjustment and within reach of the holding head the distance between the index finger or middle finger. Is to the speed setting directly below one assigned to the holding head Cover arranged at the top of the holding head so that this adjustment device is easily accessible in height. At the same time, the distance is also radial Dimension the direction so that the speed setting for the index or middle finger is easy to bridge. It is generally assumed that the axis of the grinding tool and that of the holding head overlap approximately.

The speed setting is located outside the housing and corresponds to a speed controller designed within this. to Connection of these components is provided that the speed setting over a rotatably mounted regulator ring arranged within the holding head, the speed regulator assigned. The axis of the regulator ring also essentially falls with the axis of the grinding tool or the holding head. By When the speed setting is activated, the control ring is rotated around this axis and transmits this moment to the cylinder-shaped speed controller.

The regulator ring is provided with a cover, below which the speed setting is slightly protruding, more precisely, over whose radial boundary is protruding. It is understood that the radius the limit of the coverage in this area and the radius of that of the handle the speed setting orbiting path are at least approximately the same.

The grinding device according to the invention can be driven pneumatically or electrically his. A pneumatic drive is expediently provided, which has a Supply connection as well as an exhaust air connection, the supply connection an air inlet valve is assigned to the rotor space. The air intake valve is preferably spring-loaded and directly behind the compressed air inlet of the supply connection arranged. This air intake valve is, as explained below is controlled via a handle, which can also be operated with one hand is.

As a corresponding control element, a handle as an on / off switch is on Holding head provided, which is arranged and formed movable in the direction of the holding head is. This handle is adapted to the shape of the holding head, so that it too can be operated with the back of the hand. To switch on the grinder this handle is countered in the direction of the holding head or the grinding tool the force of a suspension is moved or pivoted about a corresponding joint. Even when the back of the hand is lifted slightly, the handle moves due to the Spring action again in the opposite direction to the starting position, releases So from the holding head, so that the device switches off immediately by the compressed air supply is canceled.

The contact between the handle and the supply connection or air inlet valve is achieved by the handle one picked up by the speed controller Valve tappet is associated with the end facing away from the handle is connected to the air inlet valve. When operating the handle, i.e. when moving the same in the direction of the holding head, the valve tappet is in the direction of its Longitudinal axis moves, so that the air inlet hole is released and the compressed air can flow into the rotor space. With opposite movement of the handle the valve tappet closes the air inlet hole and the compressed air supply is canceled. Due to the longitudinal displacement of the valve tappet, the rapid Switch the device on and off and by rotating the valve tappet Speed controller regulating the rotational speed of the Grinding tool between zero and maximum position.

To regulate the speed of the grinding tool, it is proposed that that the speed controller at its end facing the air inlet valve has at least one, preferably two bores leading to an air inlet bore are formed correspondingly in the air inlet valve. Through the over the Speed setting will be applied rotation of the speed controller the holes on the end of the speed controller facing the air inlet valve brought into position to the air inlet bore.

A preferred embodiment of the invention provides that the bore and the air inlet hole varies depending on the position of the speed controller fully or partially overlapping are formed and arranged. Depending on the extent to which one of these holes overlaps with the air intake valve there is air through the supply connection or air inlet valve and holes embedded in the rotor space. The speed of the rotor can thus be controlled the speed setting can be decreased or increased. It always says a hole on the speed controller opposite the air inlet hole. Which of both holes this depends on which side of the grinder the Speed setting is connected to the regulator ring.

To install the speed setting in different positions To be able to record in the housing on opposite sides are provided, through which the speed setting in each case with the regulator ring can be connected, preferably screwed. One and the same holding head can be on different positions can be equipped with a speed setting, each where it is most convenient for the operator. In particular is intended for right-handed or left-handed people who use the index finger to adjust the speed operate, which is useful for a right-hander on the left side of the grinder and for the left-hander on the right side the grinder is arranged. The housing has corresponding receptacles for this on, the regulator ring is also designed accordingly, for example with a thread, that he record a speed setting in multiple positions can. Regardless of the position of the speed setting on the left or on the right side of the device, the regulator ring is moved by the same amount, whereby this rotary motion is then transferred to the speed controller.

Operators with different sized hands, especially male and female, is satisfied by the fact that on each side of the grinder at least two receptacles arranged one behind the other are provided, through which the Speed setting can be connected to the controller ring, preferably screwed is. In interaction with the design of the holding head, on the still with the tapering width of the same are at least two consecutively arranged receptacles per side of the grinder, which can record the speed setting. This also ensures that different users, in addition to right and left-handers, also those with different hand sizes always allows one-hand operation of the device is advantageous for the index finger, because the speed setting is always within reach is arranged. By screwing the speed setting and Recording or regulator ring is a light, fast and without additional replacement or Supplementary components can be replaced.

To improve the handling of the grinding device, it is also provided that that the holding head of a human hand is formed integrally, wherein it is on the side corresponding recesses and the cover one ergonomically to the outside advantageously has a curved surface. This ensures precise guidance of the grinder given over the surface of the object to be processed. The curved surface is adapted to the palm of the hand, the speed setting in Range of index or middle finger is. In particular, it is possible to use one exert constant pressure on the surface of the object to be processed, whereby the speed of the grinding tool can be varied during the grinding process can.

In addition, the width of the holding head is expediently in addition Tapered in sections in the direction of the supply connection. With that it should Operators with different sized hands, especially female and male Operators are enabled that the grinder or its holding head safely and conveniently to be able to hold and lead while editing. For this reason, points the holding head tapered laterally, in the area of the holding head especially can be easily gripped by hand.

To rule out unintentional start-up of the grinder can, it is provided that the grinder with a safety handle on the Back of the grinder is equipped, via which the handle can be blocked. The handle can therefore only be operated if the safety handle has been used beforehand has been released from its blocking position. So it prevents the handle inadvertently moved in the direction of the holding head or the grinding tool can be. For this purpose, a corresponding recess is provided in the handle, which is designed to correspond to the safety handle.

An expedient development of the grinding device is that in which the grinding device is equipped with a suction connection assigned to the grinding tool. This suction connection removes chips and particles from the the surface of the object have been loosened, sucked off directly without it contamination of the air or the object. For this reason the suction connection engages directly in the area of the grinding tool or its protective cover on.

In a further embodiment of the invention, the exhaust air connection and Suction connection combined in a common connection. In order to the chips and particles, i.e. the material loosened by the grinding tool conveyed directly via a combined connection. The grinder can also have a separate exhaust and a separate suction connection.

The invention is particularly characterized in that a portable Grinding device is created, with which the processing of an object for the first time One-handed operation is possible. All safety, control and regulating devices can be reached with one hand. This applies to those who act as on / off switches Handle on the back of the holding head, an additional safety handle and especially for the speed controller, which is designed to be pivotable and over the Index finger to use. The speed setting can be released from the holding head and in at least four different positions for right-handed and left-handed people or users with different sized hands. Is to the holding head is not round, but has a curved surface, in addition, the device is rising from the back to the front in a gentle line built, so that the operator put the complete hand on the housing and the grinder can safely guide.

Fig. 1

ein Schleifgerät in perspektivischer Ansicht,

Fig. 2

ein Schleifgerät in Seitenansicht,

Fig. 3

ein Schleifgerät im Längsschnitt,

Fig. 4

ein Schleifgerät teilweise im Querschnitt,

Fig. 5

ein Schleifgerät in Draufsicht,

Fig. 6

ein Schleifgerät in Draufsicht ohne Abdeckung und Handhabe und

Fig. 7

ein Schleifgerät mit separat ausgebildetem Abluft- sowie Absauganschluss.

Further details and advantages of the subject matter of the invention emerge from the following description of the accompanying drawing, in which a preferred exemplary embodiment is shown with the details and individual parts required for this. Show it:

Fig. 1

a grinding device in perspective view,

Fig. 2

a grinder in side view,

Fig. 3

a grinder in longitudinal section,

Fig. 4

a grinder partly in cross section,

Fig. 5

a grinder in top view,

Fig. 6

a grinder in top view without cover and handle and

Fig. 7

a grinder with a separately designed exhaust and suction connection.

Fig. 1 shows a grinder 1 with housing 4 with the front 5 and not recognizable here because the grinding tool is hidden under the protective cover 28. On the back 6 of the grinder 1, the holding head 3 is arranged, which can advantageously be comprised in one-hand operation, all security, Regulation and control devices can be handled. The palm of the hand The user lies on the cover 27 on the holding head 3, the surface 19 of which is arched. With the palm of your hand, provided the safety handle 25 is released, the handle 14 against the force of a spring in the direction of the holding head 3 moves. For this purpose, the handle 14 has a corresponding one for the safety handle 25 corresponding recess 33. Blocks this security handle 25 the handle 14, it cannot be moved in the direction of the holding head 3. Furthermore, on the side 21 of the grinding device 1, here in the area of the cover 27, receptacles 24 are provided, which are in the direction of the supply connection 20 are tapered towards the rear end of the grinding device 1. Especially the user can simply and safely use the index finger 10 on the upper edge 10 of the holding head 3 reach the speed setting 2.

This embodiment is a pneumatically driven one Grinding device 1, which has a supply connection 20 and an exhaust air connection having. An additional suction connection extends into the area of the grinding tool 30 provided, which in this area when processing a Extracts swirled chips, particles and other components and collectively with the exhaust air through connection 31 to a collection.

Fig. 2 shows a grinder 1 in side view, in particular here Recesses 18, the hands or fingers are formed, can be seen are. These are present in the area of the holding head 3, more precisely the cover 27. Below, the speed setting 2 is slightly above the cover 27 formed on the upper edge 10 of the holding head 3 so that it protrudes from the holding head 3 in a one-hand operation of holding head 3 and speed setting 2 enabling and from the holding head 3 within reach of the index finger or the middle finger of the user is arranged. The little one In this illustration, the distance in terms of height is in the radial direction in FIG. 5 and 6 clarifies. The speed setting 2 sits in the receptacle 23 and is connected to the regulator ring (not shown here) by screwing. The speed setting 2 can alternatively also be inserted into the receptacle 23 ' and screwed there. In this case the speed setting would be 2 arranged opposite the holding head 3 so that a user with a smaller hand can operate the grinder 1.

3 shows a longitudinal section through the grinding device 1, in particular the Components arranged within the housing 4 are clearly visible. When actuated the handle 14 after loosening the safety handle 25 is the on / off switch Handle 14 moves towards holding head 3. For this purpose, this has a joint 33. The Handle 14 is associated with a valve lifter 8, which is thus in the same direction is moved. At its end facing away from the handle 14, the valve tappet blocks 8 the spring-loaded air inlet valve 13 or the air inlet bore 17. These are arranged directly behind the supply connection 20 for compressed air. With longitudinal displacement of the valve lifter 8, the air inlet bore 17 is released, so that the Compressed air can penetrate into the area of the rotor space 26. The valve lifter 8 will recorded by the speed controller 7. The latter is on the air intake valve 13 facing end 16 with bores, which are designated in Fig. 4 with 15 equipped. Depending on one of these holes 15 for the air inlet hole 17th the rate of ratios of the grinding tool can be regulated by drilling and cover the air inlet bore to a corresponding extent and a appropriate amount of compressed air is delivered to the rotor chamber 26 and the speed of the Rotor is reduced or increased. The second hole is used when speed setting 2 is in another shot. The speed controller 7 is on the regulator ring 9 by means of the speed setting 2 regulated. This can in different recordings 34, 34 'with the regulator ring 9 are screwed. The speed setting 2 is about the axis 11, which coincides with the axis of rotation of the grinding tool in this embodiment designed and arranged pivotable, which when pivoting Exerted torque transmitted to the speed controller 7 via the controller ring 9 and the amount of compressed air released is influenced accordingly. To recognize is furthermore that in this embodiment of the grinding device 1 exhaust air connection 29 and suction connection 30 open into a common connection 31.

Fig. 4 shows a partial section through a grinding device 1. The two holes 15 at the lower end 16 of the speed controller 7. Which of faces the two bores 15 of the air inlet bore of the air inlet valve depends on which side 21, 22 of the grinding device 1 the speed setting 2 is connected to the regulator ring. In this case the speed setting 2 adapted to a right-hander, in the recess 23 the left side 21 arranged in the working direction of the grinding device 1. For a left-hander would be speed setting 2 on the right 22 used in the recess 24, where it fits for a left-hander the index finger would have to be handled. When swiveling the speed setting 2 a moment is exerted on the speed regulator 7 via the regulator ring, so that ultimately the bore 15 corresponding to the air inlet bore at the bottom End 16 of the speed controller completely, partially or not at all with the air inlet hole comes into overlap. The more the corresponding holes cover, the more compressed air can flow.

5 illustrates the ease of handling of the grinding device according to the invention 1. The holding head 3 ergonomically adapted to the palm of a hand can be seen, The speed setting 2 only survives slightly beyond its outer dimension, so that it can be operated with the index finger. At 18 there are side recesses referred to, which tapers towards the supply connection 20 are. It is easy to imagine that every user, especially a male user and female with different sized hands can grasp the holding head 3. An example is a for male user access and b is one width appropriate for access by a female user.

6 was on a cover as well without a handle, so that the regulator ring 9, which uses the speed setting 2 is rotated, is exposed. This turn is on the speed control 7 transmitted, whereupon at the opposite end the speed controller 7 associated bores not recognizable here with the air inlet bore in partial or at most complete coverage. You can also see the valve lifter 8, which is not shown here Handle moved in its longitudinal direction to switch the grinder on and off becomes.

Fig. 7 shows a perspective view of a grinding device 1, in which the exhaust air connection 29 and the suction connection 30 are formed separately. Below the the rear supply connection 20, the exhaust air connection 29 is initially arranged, which serves to discharge the exhaust air flowing out of the rotor space. Separately For this purpose, the suction connection 30 is arranged, via which the during the grinding process whirled up chips and particles derived and a collection or disposal are fed. While in Figures 1 to 6 exhaust and suction connection combined are executed, these two connections are in the variant of the invention 7 separately formed.

All of the above-mentioned features, including those that can only be taken from the drawings, alone and in combination are regarded as essential to the invention.

Claims (16)

1. Portable grinding device (1) with a housing (4), on the front side (5) of which is arranged a grinding tool driven by a rotor and on the rear (6) of which is arranged a holding head (3), wherein the grinding device (1) is equipped with a speed controller (7), via which the rotational speed can be controlled by means of a speed adjustment mechanism (2), characterised in that the speed adjustment mechanism (2) is designed so as to be pivotable about an axis (11) extending substantially perpendicular to the grinding tool and is associated with the upper edge (10) of the holding head (3).
2. Portable grinding device according to claim 1, characterised in that the speed adjustment mechanism (2) of the holding head (3) is arranged at a distance which allows one-handed operation of the holding head (3) and speed adjustment mechanism (2) and located within reach of the index finger or middle finger from the holding head (3).
3. Portable grinding device according to one or more of the preceding claims, characterised in that the speed adjustment mechanism (2) is associated with the speed controller (7) via a pivotally mounted control ring (9) arranged inside the holding head (3).
4. Portable grinding device according to one or more of the preceding claims, characterised in that the control ring (9) is provided with a cover (27), below which the speed adjustment mechanism (2) is designed to slightly project.
5. Portable grinding device according to one or more of the preceding claims, characterised in that a pneumatic drive is provided which has a supply connection (20), and an exhaust connection (29), an air inlet valve (13) into the rotor space (26) being associated with the supply connection (20).
6. Portable grinding device according to one or more of the preceding claims, characterised in that a handle (14) is provided as an on/off switch on the holding head (3), which handle (14) is arranged and designed so as to be movable in the direction of the holding head (3).
7. Portable grinding device according to one or more of the preceding claims, characterised in that a valve plunger (8) which is received by the speed controller (7) and is connected at its end remote from the handle (14) to the air inlet valve (13), is associated with the handle (14).
8. Portable grinding device according to one or more of the preceding claims, characterised in that the speed controller (7), at its end (16) facing the air inlet valve (13) has at least one, preferably two holes (15) which are designed to correspond to an air inlet hole (17) in the air inlet valve (13).
9. Portable grinding device according to one or more of the preceding claims, characterised in that the hole (15) and the air inlet hole (17) are designed and arranged so as to completely or partially overlap as a function of the position of the speed controller (7).
10. Portable grinding device according to one or more of the preceding claims, characterised in that receivers (23, 24), by means of which the speed adjustment mechanism (2) can be connected, preferably screwed, in each case, to the control ring (9), are provided in the housing (4) on opposing sides (21, 22).
11. Portable grinding device according to one or more of the preceding claims, characterised in that at least two receivers (23, 23') arranged one behind the other, by means of which the speed adjustment mechanism (2) can be connected, preferably screwed, in each case, to the control ring (9), are provided on each side (21) of the grinding device (1).
12. Portable grinding device according to one or more of the preceding claims, characterised in that the holding head (3) is moulded for a human hand, wherein it has laterally corresponding recesses (18) and the cover (27) has a surface (19) which is outwardly curved in an ergonomically advantageous manner.
13. Portable grinding device according to one or more of the preceding claims, characterised in that the holding head (3) is designed so as to taper in sections in its width in the direction of the supply connection (20).
14. Portable grinding device according to one or more of the preceding claims, characterised in that the grinding device (1) is equipped with a safety handle (25) on the rear (6) of the grinding device (1), via which safety handle (25) the handle (14) can be blocked.
15. Portable grinding device according to one or more of the preceding claims, characterised in that the grinding device (1) is equipped with a suction connection (30) associated with the grinding tool.
16. Portable grinding device according to one or more of the preceding claims, characterised in that the exhaust connection (29) and suction connection (30) are combined in a common connection (31).

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