EP2913151B1 - Tool for surface finishing - Google Patents

Description

The invention relates to a tool for surface finishing in the form of a grinding plate, polishing plate o. The like., Which has a fitted with lamella underside and with this underside flat to create a workpiece and use with flat working movements. Such tools can be designed both for manual operation, as well as - with mating drive connections - for mechanical operation, wherein the machine operation in most cases a rotation about an underside of the tool substantially vertical axis, more rarely an eccentric or oscillating translational Movement provides. The use of fins as a working means allows the provision of a significantly larger amount of working fluid compared to abrasive sheets and the like. Working tools and thus longer life of the tool and provides the effective lamella width below the bottom of a volume ready to store in the worn or worn material and that even in the surface finishing of wavy or curved surfaces allows an adjustment.

Tools of the type considered here are, for example, from WO 2012/163357 A1 or the EP 1 633 530 A known in which slats used in grooves on the underside of a top-closed working medium carrier and, for example are fixed by gluing or pouring. A manufacturing method of this type is not very suitable for mass production and requires a variety of different manufacturing and assembly steps.

A generic tool is in the WO 2010/028 255 A1 , in Fig. 11 discloses with a circular tool carrier and with a ring gear inside, top and bottom open grooves in the plastic strips are inserted as a working means from top to bottom. The grooves are closed at the ends and can be closed off at the top with a flat cover with screw connections. Inserting working material strips is difficult with tightly seated in the working medium carrier to avoid vibration and dirt accumulation and impractical especially for long and flexible slats.

The object of the invention is in contrast to provide a tool that is cheap to produce as a standard product and easy to assemble with lamellas for various requirements and that also allows the user side a conversion or renewal with replacement worn lamellae.

According to the invention, this object is achieved with a tool according to claim 1. With such a tool, in which the working medium carrier consists of a one-piece plastic injection-molded part, which holds the lamellae in grooves, which open towards the bottom narrows, a constructive key component for the entire tool is created. The upwardly unobstructed open grooves allow Designs of the injection molding tool with simple shapes and easy opening to make the injection molding and in particular the demolding quickly and safely. Nevertheless, the slats in the grooves are already held on several sides. The lid closes the grooves on the top side, holds the lamella captive in the grooves and also covers the top of the tool carrier, so that with rotating or oscillating tool protection against contact is given, the surface can be made appealing and less susceptible to dirt and handles such as hand-operated tools Form on the lid and form are.

Advantageously, the lid cooperatively designed with the working medium carrier that he picks up with its underside on the slats or their retaining edge and fixed or clamped the slats in the groove and in particular against longitudinal displacements in the frictionally or positively fixed. Furthermore, a lid is suitable to form ducts for air guidance of suction air with the working medium carrier, which open approximately between the slats on the underside and lead out with connection openings in the top of the lid - approximately matching exhaust ports in standard versions of drive machines.

The lid, which itself may also consist of several parts and approximately in a rotating tool of one or more ring elements, must be regularly connected for work use of the tool firmly with working medium carrier. This involves a detachable connection of the lid or part thereof the resource carrier is not sufficient and requires neither a significant manufacturing cost in the production nor a complicated structure of the tool.

The connection between the lid and working medium carrier can be done by simple screwing or brackets, as well as locking can be provided. In rotationally symmetrical tools, such as for use on rotating drives such as hand drills, threaded connections, bayonet joints or the like complementary connection pairs can already be formed during injection molding and engaged with a simple rotation, the direction of rotation preferably corresponds to the workload to preclude disengagement at workload , A detachable connection can give the user of the tool the possibility of slats in whole or in part to replace wear or adaptation to the work.

Otherwise, the lid can be simply and robustly connected to the working medium carrier to form a "disposable tool", such as by gluing or - in the case of matching thermoplastic materials of injection-molded materials in the lid and working medium carrier - welding. In any case, the design of the tool according to the invention allows a variable assembly in the production with advantages for simple operations in mass production.

For mechanically actuated tools of this type, a drive connection suitable for the drive is to be provided, which is expediently fixedly connected to the working medium carrier itself and thus enables a robust and direct guidance of the drive forces, while the cover remains stress-free and, accordingly, can be carried out easily.

For hand-operated tools of this type, on the other hand, advantageously a lid in the form of a cap closed on the top can be provided with a grip area, the handle being able to be grasped in the manner of a knob, or even with a flat imprint and tangible in a wrist strap.

Fig. 1

Ansicht eines Werkzeugs in Explosionsdarstellung, schräg von unten,

Fig. 2

Ansicht einer Lamelle für ein Werkzeug nach Fig. 1,

Fig. 3

vergrößertes Detail aus Fig. 2,

Fig. 4

Ansicht einer weiteren Lamelle zu einem Werkzeug nach Fig. 1,

Fig. 5

vergrößertes Detail aus Fig. 4,

Fig. 6, 7, 8

Ansicht von weiteren Lamellen mit besonders konturierter Unterkante,

Fig. 9, 10, 11

Ansichten der Lamellen nach Fig. 6, 7 bzw. 8, eingesetzt in ein Werkzeug nach Fig. 1

Fig. 12

Explosionsdarstellung eines anderen Werkzeugs gemäß der Erfindung in Ansicht schräg von unten,

Fig. 13, 14, 15

Details aus Fig. 12,

Fig. 16

Explosionsdarstellung eines noch weiteren Werkzeugs gemäß Erfindung in Ansicht schräg von oben

Fig. 17

Detail aus Fig. 16

Fig. 18

Explosionsdarstellung eines noch weiteren Werkzeugs gemäß der Erfindung in Ansicht schräg von oben,

Fig. 19

Ansicht eines Werkzeugs gemäß der Erfindung in Ansicht schräg von oben,

Fig. 20

Explosionsdarstellung zu dem Werkzeug nach Fig. 19,

Fig. 21

Ansicht eines weiteren Werkzeugs gemäß der Erfindung in Ansicht schräg von oben

Fig. 22

Explosionsdarstellung zum Werkzeug nach Fig. 21,

Fig. 23

Ansicht eines Werkzeugs gemäß der Erfindung in Ansicht schräg von oben und

Fig. 24

Explosionsdarstellung zum Werkzeug nach Fig. 23.

Embodiments of the invention are illustrated in the drawings and will be described in more detail below. In the drawing show:

Fig. 1

View of a tool in an exploded view, diagonally from below,

Fig. 2

View of a slat for a tool behind Fig. 1 .

Fig. 3

enlarged detail Fig. 2 .

Fig. 4

View of another slat to a tool after Fig. 1 .

Fig. 5

enlarged detail Fig. 4 .

Fig. 6, 7, 8

View of further lamellae with a specially contoured lower edge,

FIGS. 9, 10, 11

Views of the slats after Fig. 6, 7 or 8, used in a tool according to Fig. 1

Fig. 12

Exploded view of another tool according to the invention in view obliquely from below,

FIGS. 13, 14, 15

Details from Fig. 12 .

Fig. 16

Exploded view of yet another tool according to the invention in view obliquely from above

Fig. 17

Detail off Fig. 16

Fig. 18

Exploded view of a still further tool according to the invention in view obliquely from above,

Fig. 19

View of a tool according to the invention in a view obliquely from above,

Fig. 20

Exploded view of the tool after Fig. 19 .

Fig. 21

View of another tool according to the invention in view obliquely from above

Fig. 22

Exploded view of the tool after Fig. 21 .

Fig. 23

View of a tool according to the invention in view obliquely from above and

Fig. 24

Exploded view of the tool after Fig. 23 ,

An in Fig. 1 A total of 1 designated tool for surface finishing such as cleaning, grinding or polishing by means of underside projecting and provided with suitable working fluid slats 2 is rotationally symmetrical with respect to a vertical center axis formed with a working medium carrier 3 and a lid 4, both firm and sufficiently reliable over thread formations too are connect, wherein a thread forming 5 in a central opening 6 of the lid 4 on matching male threaded portions on the opening 6 by a cross-shaped drive connection (not shown) engages, which is integrally connected to the working medium carrier 3 and projects in the middle of this upwards. Basically similar designs of such a drive are described below with reference to Fig. 16 and 18 illustrated.

The thread formations as the thread 5 in Fig. 1 but are only one example of many practical connection possibilities between the lid and working medium carrier, which may for example also be formed like a bayonet, but could also be provided on the periphery of the working medium carrier 3 and the lid 4. In addition, there is the possibility of the connection between the cover 4 and the working medium carrier 3 by screwing, which are provided for example on a screwing circle, or brackets, possibly also by profiling or meshing between cover 4 and working medium carrier. 3 could be relieved against rotation to provide a releasable connection. However, if for the user of the tool, a solubility of the lid from the working medium carrier is not interested in or after use, both can be permanently connected to each other during assembly, for example by gluing or welding.

These diverse embodiments can be produced quickly, easily and inexpensively by way of an injection molding production with a working medium carrier 3 and a lid 4 made of plastic. The working medium carrier 3 has for receiving lamellae 2 predominantly radially aligned grooves 7, whose groove cross-section is designed for the cross section of an upper thickened retaining edge 8 of the slats 2, which point from the retaining edge down and thereby pass through a constriction 9 of the groove cross-section before they emerge functionally effective on an underside 10 of the working medium carrier 3 with an exposed strip.

The grooves 7 open at the edge with open groove cross-section and thus allow placement of the working medium carrier 3 with the strip-shaped, stiffened by the thickened retaining edge 8 slats 2 by these are inserted from outside to inside in the longitudinal direction in the grooves 7.

The grooves 7 are - due to manufacturing technology - formed unobstructed upwards open. This makes it possible in particular to refrain from complicated multipart injection molds for a working medium carrier 3 with narrowed and accessible grooves and instead a simple, preferably only two-part mold pretending to be fast, easy and robust to handle also for demolding in a simple opening movement.

With the underside, top and end-side opening grooves 7 gaps are formed, between which the working medium carrier 3 keeps sectors that are interconnected only in a central region. The grooves are indeed, how Fig. 1 indicated by the lower edges of the slats 2, different lengths, namely alternately shorter or longer to cover the bottom 10 of the working medium carrier more uniformly with the flock of slats 2, nevertheless, results from the grooves 7, a mechanical weakening of the working medium carrier 3. This weakening could Although basically still be reduced via a (not shown) connecting ring on the outer edge, which extends above the open end sections of the grooves 7 as well as outside the upper-side openings of the grooves. In the present case, however, a stiffening using the cover 4 is achieved.

In the one-piece lid 4, a collar 12 is circumferentially formed in addition to a substantially flat top plate 11, which then after the working medium carrier 3 equipped with slats 2 and connected to the lid 4, a peripheral edge 13 of the working medium carrier 3 tightly encloses. Thus, the open end sections of the grooves 7 are sealed off against ejection of the slats 2.

In addition, the annular collar 12 is equipped with internally formed locking knobs 14, which engage in the end cross sections of the grooves 7 and the sectors of the working medium carrier 3 against each other, but at the same time also represent a Rasthemmung in the circumferential direction against a loosening or loosening movement in the connection between the working medium carrier 3 and cover 4, when about during use of the tool torque loads occur. In principle, however, the direction of rotation in the thread formations 5 between the cover 4 and the working medium carrier 3 is selected so that the loading moments act in the sense of a firm connection.

Suitably, the annular collar 12 also has a total or at least partially encircling locking rim 15, with which the annular collar 12 can also engage below the working medium carrier 3 on the underside, in order to secure the connection between the lid 4 and the working medium carrier 3.

The lid 4 has, in addition to the central recess 6, a ring of evenly distributed openings in the circle, which serve as connection openings 16 for a dust extraction. These are, for example, suitable for a concentric suction air connection of a drive with the outside diameter. The Saugluftführung below the lid 4 but then, as with open channels in the working medium carrier 3 and conclusion by the cover 4 from above, optionally be designed to access suction openings 17 on the underside of the working medium carrier 3, between the grooves 7 and are laid by these outgoing slats. In the design of the tool 1 to Fig. 1 Cover the connection openings 16 and the farther outward suction still so far that a direct suction air is given. The lid 4 Thus, if such a tool is to be equipped for use with a dust extraction, then in a simple manner to set up the suction openings 17 and place the top-side connection openings in the cover suitable for the machine-side conclusion.

In the Fig. 2 to 11 Examples are shown in which the lamellae, which allow not only compared to grinding or polishing papers or the like surface work equipment to provide larger amounts of working fluid and also provide intermediate volume for abrasion and dirt, are also different. A tool of the type presented here is suitable to be equipped with different slats, although a vote of the upper retaining edge is to specify the grooves 7 of the working medium carrier.

A simple embodiment of a blade 19 according to Fig. 2 provides that three strips of double width, centrally folded longitudinally around an inner cable 20 are placed with a round cross-section and fixed in this position. Thus, the slats provide a longitudinally insertable strip mold according to the invention with thickened retaining edge.

A variant of a blade 21 according to 4 and 5 has a relatively thin inner cable 22, but is reinforced in the region of the reinforced retaining edge on the periphery with a piping 23 to achieve an easily retractable, but nevertheless low-play in the groove 7 of the tool carrier 3 to be arranged form the retaining edge.

In FIGS. 6, 7 and 8 different lamellae 24, 25, 26 are shown, whose lower edge is not simply formed parallel to the retaining edge, but contoured in a special way, for example, a concave envelope surface 27 in the assembled state according to Fig. 9 or a convex envelope surface 28 according to FIG Fig. 10 or a wavy lower surface 29 according to Fig. 11 to achieve. Thus, embodiments for specific applications, such as hollow or spherical shapes to capture specifically. One opposite the tool 1 to Fig. 1 modified embodiment of a tool 31 results from the Fig. 12 to 15 , The description of the tool 1 can be referred to. The hereafter emphasized deviations are in particular complementary in both sides profiled configurations of a work support 32 and a lid 33, wherein the work support 32 has grooves over which the fins 34 with thickened Halteränder 35 survive, but from the top by matching profiles of the lid 33rd to the work support 32 out to clamp the thickened holder edges of the fins 34 between the work support 32 and lid 33.

Furthermore, the lid 33 is not integrally provided with an annular collar but is gripped and clamped together with the working medium carrier 32 by a peripheral ring 36. A solubility of the retaining ring 36 can be achieved in that this radially inwardly directed coupling pins 37 (FIG. Fig. 15 ), which in circumferential grooves 38 in the lid 33 and in the working medium carrier 32 (FIG. FIGS. 13 and 14 ) movably engage to achieve a retaining connection, wherein the grooves guided in the manner of a bayonet connection and thus the connection are secured against easy release.

Another tool 41 after FIGS. 16 and 17 has to a lower surface from which open the lamellae over narrowed groove cross-sections, a highly curved edge region on which the arc-shaped Halträndern 43 suitably shaped lamellar strips 42 also emerge radially. Grooves 44 in one of the lower surface having work support means 45 are not straight, but formed on the outside ascending.

A cover 46 has a convex, the holder edges 43 of the fins 42 of the cupped bottom 47 with open Nutausformungen 48 for top fixing the holder edges 43 of the fins 42nd

Outwardly projecting latching formations 49, enlarged in Fig. 17 shown, engage in the end open groove cross-sections 44 of the working medium carrier 45 so as to one to stabilize the working medium carrier 45 and to set the cover 46 against rotation of the working medium carrier 45. The connection between the cover 46 and working medium carrier 45 in the axial direction is in Fig. 16 not illustrated. This can, as stated above, be achieved in various ways by common means.

At the working medium carrier 45, a conventional drive connection 50 is shown in a pin shape, in which the injection molding process, a metal form nut 51 is embedded because of the greater strength. This drive port 50 passes through the lid 46 in a central opening, so that the power flow from Drive over a short distance can go directly into the working medium carrier 45 while the lid remains unloaded.

The working medium carrier 45 has suction slots 52 which open on the underside between the fins 42 and the upper side with Sauganschlussschlitzen 53 in the lid 46 in conjunction to create an air duct for dust extraction, the slots 52 and 53 by no means must be congruent. Typically, the slots 52 extend radially farther outward than the slots 53 radially defined for the corresponding machine port.

Another embodiment according to Fig. 18 shows a tool 54 according to the invention, in which in a working medium carrier 55 of the otherwise previously described type slats 56 are not issued vertically downwards but obliquely. In the present case, the employment "sluggish", ie for a rotation of the working medium carrier 55 in the clockwise direction aligned. This facilitates a flat overlapping working position of the slats. For other applications, an inclination of the slats against the direction of rotation may also be considered, for example, to allow the slats build a bending stress during polishing or grinding and thus to achieve a cushioning effect. In any case, the respective desired inclination of grooves 57 can be predetermined and stabilized by picking up a cover 58.

Again, the work support means 55 is provided with an integrally molded drive connection 59, so that the forces applied by the respective drive or moments within the working medium carrier 55 are transferred to the fins 56, while the cover 58 is so far outside the power flow.

In FIGS. 19 and 20 is a tool 60 for surface finishing by hand, wherein Fig. 20 only shows the exploded view or single part view before the finished installation of the tool. The tool 60 has a working medium carrier 61 in a rotationally symmetrical shape with radial grooves 62 for receiving fins 63, but is not provided in the middle with a drive connection for mechanical operation, but with a coupling ring 64, on which a hand knob 65, by a Central opening 66 of a lid 67 with a locking pin 68 inserted and latched. The design of the working medium carrier 61 and the lid 67, as well as their adaptation to each other follows the above-described designs for a machine-operated tool. Again, the force is introduced from the hand knob 65 directly into the working medium carrier 61, bypassing the lid 67, which is interpreted on the cover of the working medium carrier 61 and the determination of the fins 63 in the grooves 62.

Another hand operated tool 70 is seen obliquely from above in FIG Fig. 21 and in an exploded view in FIG Fig. 22 can be seen, wherein the design of a rotationally symmetrical working medium carrier 71 with grooves 72 for storage of fins 73 corresponds to the above-described design lines, but has no central introduction of force. The working medium carrier 71 is rather firmly connected to a cover 74, which not only the cover of the working medium carrier 71 and the positional fixing of the slats 73 in this with its (not shown) underside and an outer cross-annular collar 75 accepts, but also with a convex top side 76 provides a handle area for manual operation. The forces of manual operation are then primarily in the lid 74 and initiated by this via points of contact and connections to the working medium carrier 71 and in the fins 73. For easier manual operation, a hand strap 77 is provided on the upper side, which can be welded or sealed, for example, of plastic material, if the lid 74 is made of a suitable plastic material, otherwise screwed or riveted, for example, wherein the hand strap 77 in terms of width adjustment of two strips 78, 79 is to be fixed with spaced ends on the lid 74 and to be fixed to overlapping areas by a hook and loop fastener or other releasable connection.

Another hand-operated tool 80 for surface finishing according to the oblique top view according to Fig. 23 and the exploded view according to Fig. 24 is executed in rectangular basic form (instead of the planned round basic shapes). Again, lid 81 serves as a grip surface for a hand grip, supported by a hand strap 82 of two against each other for width adjustment detachable and connectable strips, the hand strap 82 is placed diagonally on the lid 81. The lid 81 engages over a working means carrier 83 on two opposite longitudinal sides, at each of which a part of grooves 87 for storage and holding of lamellae 84 open out. The fins 84 and the grooves 87 are given as a set of parallel, which does not over the entire width of the Work medium carrier 83 run, but leave an end area. The fact that the grooves are alternately guided by the one and the other longitudinal side of the working medium carrier 83 inwardly, the working medium carrier 83 remains in one piece. The distances between the parallelepiped of the lamellae are less in a central region over the width of the tool 80 than in the edge regions to the longitudinal sides. This is also a desired in practice marginal attenuation in surface finishing can be achieved.

The lid 81 has on an underside 85 on the lamellar upper edges aufgreifende shape in order to determine this as possible without play in the working medium carrier 83. Next, the lid 81 engages with downwardly directed side portions 86 over the longitudinal edges of the working medium carrier 83 to smoothly complete the edges and to fix the embedded lamellae.

It is understood that the above-described round embodiments as well as the rectangular embodiment according to FIGS. 23 and 24 represent only exemplary examples of a variety of design options to meet in particular rotating or reciprocating working movements. In practice, there are also, for example, tools for surface finishing with approximately triangular outline, such as for eccentric mixing movements on a surface to be machined.

Claims (13)

1. Tool for finely processing surfaces, such as cleaning, grinding or polishing, comprising a working medium carrier (3, 32, 45, 55, 61, 71, 83), the lower face of which is fitted with a number of blades (8, 19, 21, 24, 25, 26, 34, 42, 56, 63, 73, 84) which are uniformly distributed, point predominantly downwards and each extend, together with an upper holding rim that has a thickened cross section, in grooves (7, 44, 57, 62, 72, 87) in the working medium carrier (3, 32, 45, 55, 61, 71, 83), the grooves (7, 44, 57, 62, 72, 87) narrowing towards the lower face of the working medium carrier (3, 32, 45, 55, 61, 71, 83) and each blade (8, 19, 21, 24, 25, 26, 34, 42, 56, 63, 73, 84) being abie to pass through as far as the holding rim, the working medium carrier (3, 32, 45, 55, 61, 71, 83) consisting of an injection-moulded plastics component in which the grooves (7, 44, 57, 62, 72, 87) are formed so as to be open and not narrowing upwards and are covered on the top thereof by a cover (4, 33, 46, 58, 67, 76, 81) which is rigidly connected to the working medium carrier (3, 32, 45, 55, 61, 71, 83), closes the top of the grooves (7, 44, 57, 62, 72, 87) together with the blades (8, 19, 21, 24, 25, 26, 34, 42, 56, 63, 73, 84) located therein, and grips the blades (8, 19, 21, 24, 25, 26, 34, 42, 56, 63, 73, 84), characterised in that, at least at one end, the grooves (7, 44, 57, 62, 72, 87) lead outwards out of the working medium carrier (3, 32, 45, 55, 61, 71, 83) so as to have an open groove cross section, and in that the cover (4, 58, 67, 76, 81) engages over the edges of the working medium carrier (3, 55, 61, 71, 83) and closes the ends of the grooves (7, 57, 62, 72, 87) at least in part.
2. Tool according to claim 1, characterised in that, distributed across the lower surface thereof, the working medium carrier (3, 45) comprises suction openings (17, 52) connected to suction channels extending upwards through the working medium carrier (3, 32, 45, 55, 61, 71, 83), which channels are covered on top at least in part by the cover (4, 33, 46, 58, 67, 76, 81).
3. Tool according to either claim 1 or claim 2, characterised in that the working medium carrier (3, 32, 45, 55, 61, 71) is circular and has radially extending grooves (7, 44, 57, 62, 72) which open out circumferentially.
4. Tool according to claim 3, characterised in that the grooves (7, 44, 57, 62, 72) extend towards a central region of the working medium carrier (3, 32, 45, 55, 61, 71) so as to be alternately shorter and longer.
5. Tool according to any of claims 1 to 4, characterised in that the lower face of the working medium carrier (45) is convex and in that the blades (42) have a curved strip shape.
6. Tool according to any of claims 1 to 5, characterised in that the working medium carrier (3, 32, 45, 55) is directly connected to a drive connection (50).
7. Tool according to any of claims 1 to 6, characterised in that the cover (4) is detachably connected to the working medium carrier (3) by a screw connection (5) or a latching connection.
8. Tool according to claim 7, characterised in that the screw connection (5) or latching connection is formed in the region of two annular surfaces of the cover (4) and the working medium carrier (3), which are one inside the other.
9. Tool according to claim 8, characterised in that the working medium carrier comprises a drive cut-out which penetrates upwards through the cover (4), the connection (5) being formed between the drive cut-out and the cover (4).
10. Tool according to any of claims 1 to 5, characterised in that the cover (76, 81) engages over the working medium carrier (71, 83) in the form of a cap with a closed top and comprises a handle region.
11. Tool according to claim 10, characterised in that the cover (67) is provided with a knob-like handle (65).
12. Tool according to claim 9, characterised in that the cover (76, 81) comprises a hand loop (77, 82).
13. Tool according to claim 12, characterised in that the hand loop (77, 82) consists of two loop pieces (78, 79) that are opposite one another and can provide width adjustment.

Images