CH646629A5 - CASSETTE FOR PROTECTED STORAGE OF A SET OF DRILLS. - Google Patents

Description

The invention relates to a cassette for the protected storage of a set of drills and for the optional removal of the drills, which are arranged in individual pockets, which can be closed by means of a cover device, which has at least one opening, which is guided by guided displacements of the cover device in each case suitable positions can be brought to the release of a single drill.

A well-known cassette of this type comprises a straight circular cylinder, on the upper base surface of which parallel pockets parallel to the cylinder axis open, which are arranged along two circles concentric with the cylinder axis at equidistant angular intervals. The pockets for the drills with the larger nominal diameters are arranged along one, for example the outer circle, and those for the drills with the smaller nominal diameters are arranged along the inner circle. A cover and selection cap rotatably arranged on the cylinder has two circular selection openings which can be brought into a concentric arrangement with one of the insert compartments of the inner or the outer circle for the targeted removal of a selected drill. In the intermediate positions, in which the openings do not overlap or only partially overlap with individual openings of the pockets, these are closed.

The known cassette has at least the following disadvantages due to this construction:

The shaping measures required for the captive and rotatable arrangement of the top cap on the cylinder can only be implemented in plastics technology with relatively complex molding tools and devices, which of course has a considerable impact on the manufacturing costs. Another disadvantage of the known cassette is that, due to its cylindrical shape with a relatively large diameter of approximately 7 to 8 cm, it is used for so-called blister packs, which has a plastic sleeve adapted to the shape of the cassette and a cardboard box with an opening attached to it include to insert a bracket, is unsuitable, which is particularly unfavorable for storage. It is also disadvantageous for the use of the known cassette that the selection positions of the top cap, which are associated with the larger nominal diameters and the smaller nominal diameters, and which are marked along the circumference of the cylinder, are nested one inside the other, and that the intermediate positions of the top cap, in which the pockets are locked should be subject to very tight tolerances, so that even slight displacements of the top cap, which are unavoidable when transported in a tool box, can lead to individual drills

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fall out and get damaged or lost, the sliding selector belt on the pocket of the removed

can. chose drill relieved.

The object of the invention is therefore to provide a cassette of the design of the cassette according to the features of the type mentioned that is simpler and cheaper. Claim 6 has the advantage that the selector belt can also be produced that requires less stacking space s can then be easily moved when the cassette reliably protects the drills stored in it and is still easy and convenient to use to guide the selector belt. a document is supported.

This object is achieved according to the invention by the features specified in the features of claim 7, a cassette-characterizing part of claim 1, which in a simple manner to a Kas- (a) to (c): io sette with more than two Rows of pockets is expandable.

This achieves at least the following advantages for the easy-to-use design of the selector belt according to the use of the cassette:

The selector belt can be used to shut off the pockets by sliding the selector belt along the sliding surface and

be placed in such a position that both selector buttons also ensure that the drill bit is attached to the insert

not have a very large distance from the nearest inner side of the tape with this pocket, so that it can practically be completely hooked out.

locks is that the band "by itself" can get the additional grip beads according to claim 9, in which an unintentional emergence of a easier adjustment of the dial openings of the dial-up drill is possible from an insert pocket. The cassette on the selected pocket and can be connected in a shape that is very suitable for accommodation in manure on the guide ribs and / or on the other usual tool box, which is for the appropriate side surfaces of the cassette body arranged corresponding use of such a cassette especially markings for displaying the nominal diameter of the favorable. The cassette can be used according to the usual procedure of the selected drill. Plastic injection molding technology is simple and inexpensive to manufacture. Due to the feature of claim 10, a cassette is adjustable and, due to its shape, can also be specified with an optimal design, which enables particularly convenient, hanging space utilization in large quantities and / or allows the cassette to be used.

or be stored. The elastic design of the selector belt according to the

It is understood that the clear diameter of the on-features of claim 11 enables simple assembly.

slots to the nominal diameter of the cassette contained therein and also allows a drill to be easily adapted and expediently slightly larger than 30 if necessary, the replacement of a damaged

than these are chosen. A common drill set includes the second selection band.

for example, a number of several drills of the same. The feature of claim 12 allows one of types (eg HSS hyper high-speed steel) but with sufficiently secure frictional fixation of the band in different nominal diameters, depending on the number of positions , into which two or more rows 35 plug compartments have been placed, for example to shut off the drills to be accommodated, are to be provided by insert compartments in the cassette. If, according to the features of claim 13, the loan also includes such drill sets, which drills are roughly divided into two strands, which in the manner of a nominal diameter but of different types, comprise bellows overall for the required stroke for the selection stroke e.g. a wood drill, a stone drill, a chrome section can be shortened or extended, the selector vanadium drill for soft metals and an HSS drill 40 being arranged between the two strands and which have the same nominal diameter, as well as those remote from the selector Ends of the strands on those taps that match metal drills. opposite end faces of the cassette are fixed,

An alternating release of the pockets of the front face, which is perpendicular to the mouth openings of the Emden rows due to the displacement of the selector band, can be achieved, for example, by the fact that the cover band, which is susceptible to wear along each 45, significantly reduces one of the two Rows of movable dial openings, in and the cover tape remains seen even when the cross direction of the tape is used frequently, cassette arranged next to one another can be moved easily.

are net, and that the pockets, in the longitudinal direction of the use advantages achieved by the inventive

Band seen, are arranged equidistantly, the unit cassette are at least the following:

pockets in one row with those in the other 50 The fold-like cover band lies on a gap at every height. After a pocket of the one position of use only loosely on the covered end faces of the

Row will then next each one compartment of the other cassette body, so that between the tape and this

Row released. Dirt parts never came into contact with surfaces vigorously

The arrangements of the selector openings according to claim the sliding surfaces are pressed and thereby damage 2 has the advantage over the same case that the same and / or the band and the slight displacement of the band initially cause the usual displaceability of the band and the selector Pockets in one row and then the pockets could interfere. It is also advantageous that the tape is released to the other row. encloses only part of the cassette, so that less. . ,. , ". _ ". At least the narrow boundary surface of the cassette which is located above the mouth openings of the compartments is not covered by the features of claim 3, possibly m, and the alternative according to claim 4 is enclosed with an alternative strap. This cassette surface can be used essentially as a second embodiment of the cassette - then as a stand surface without specifying the danger that is particularly suitable for a simple existing existing on the stand surface dirty parts production in plastic injection molding technology. come into contact with the dgm masking tape and apply this

The design of the cassette according to features 65 can damage. In addition, if suitably solvable

of claim 5 has the advantage that the drills with their design of the strand ends, the masking tape including the dial

what can be easily removed from the setting of the respective link used and so-

Selection opening of along the circumference of the cassette body with a possibly necessary cleaning of the cassette

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is easily possible. Another advantage is the shorter dialing path, which is at most equal to the length of a row of pockets.

The features of claim 14 ensure that the cover band lies loosely against the sliding guide surfaces over its entire length and nevertheless a sufficiently precise guidance of the corrugated member and the band is ensured.

In the design of the masking tape according to the features of claim 15, this has the property that it opposes an increasing elastic restoring force against a selection movement with increasing distance of the selector from its rest position, in which the two strands of the masking tape are relaxed or have the same elastic pretension. This property of the selector belt can be used to advantage by a suitable choice of length and a suitably symmetrical arrangement of its dreams so that the selector automatically returns from a selector position to its rest position, in which all of the pockets are covered.

The features of claim 16, possibly in combination with those of claim 17, provide a design of the cover tape of the cassette which promotes a defined wrinkling of the cover tape in the course of the selection movement and its simple and inexpensive manufacture in plastic technology.

The features of claim 18 provide an arrangement of the pockets and a design of the selector, which ensure particularly reliably that in a position of the selector in which a selected drill can be removed from its pocket, the other pockets in the longitudinal and transverse directions are safely covered.

The specified by the features of claim 19 and for a practically particularly important special case by the features of claim 20 specified in detail design of the selector and the cassette body results in a particularly space-saving and thus advantageous from the point of view of easy handling and inexpensive manufacture of the cassette Structure of the same.

Further details of the invention result from the following description of exemplary embodiments with reference to the drawing. Show it:

1 is an overall view of a drill cartridge according to the invention, in perspective, approximately on a scale of 1: 1,

2 shows a side view of the cassette according to FIG. 1, on a scale of 1: 1,

3 shows a section along the line III-III of FIG. 2, FIG. 4 shows the cassette according to FIG. 1 in a view of the mouth openings of the slots for the drills, with the selection tape removed, likewise on a scale of 1: 1,

5 in an illustration corresponding to FIG. 4, an alternative, essentially two-part embodiment of the cassette body,

6 shows details of plug-in latching connections for fastening the individual parts of the cassette body according to FIG. 5, on a larger scale,

7 shows a further embodiment of a cassette according to the invention in a section running at right angles to the axes of the pockets,

8 shows a side view of a further embodiment of the cassette according to the invention, with the groove cheeks of the guide groove partially broken off on the visible side for a two-part masking tape and a selector, approximately on a scale of 1: 1,

9 is a view of the narrow side of the cassette according to FIG. 1, partly in section along the line II-II of FIG. 8,

10 shows a special arrangement of the pockets of a cassette according to the invention, in a top view, with the cover tape removed,

11 shows a further arrangement of the pockets, which is possible in connection with a special design of the selector, in a representation corresponding to FIG. 3,

Fig. 12 details of the selector according to Fig. 4, and

13 and 14 a special design of a cover tape which can be used in the cassette according to the invention as a plastic folding tape, in the stretched or folded state.

The cassette 10 according to the invention shown in its details in FIGS. 1 to 4 is designed to hold a set of a total of 19 twist drills of standardized size, the nominal diameters of which vary in increments of 0.5 mm between 1 mm and 10 mm.

The cassette 10 has an essentially cuboid base body 11 with wide side surfaces 12 and 13, the aspect ratio a / b of which is approximately 4/3, the side length a being approximately 140 mm being somewhat larger than the length of the largest, the nominal diameter 10 mm having drill, and with narrow end faces 14, 16 and 17, 18, whose width c measured at right angles to the side faces 11 and 12 is approximately in the ratio 1/5 to the greatest side length a.

At the upper end face 14 of the cuboid base body 11 shown in FIG. 4 in plan view at the top according to FIGS. 3 and 4, in the arrangement shown in FIG. 4, to the details of which reference is expressly made, insert compartments 19 and 20, in 2, the drill 21 with the largest nominal diameter of 10 mm and a length of approx. 132 mm and the drill 22 with the average nominal diameter of 6.5 mm and a length of approx. 100 mm are shown, are inserted recessed. In the special exemplary embodiment according to FIGS. 2 to 4, the compartments 19 and 20 are designed as blind bores or circular cylindrical depressions, the axes 23 and 24 of which run perpendicular to the upper end face 14 and in two planes 26 parallel to the side faces 12 and 13, respectively or 27. In one plane 26 are the axes 23 of a total of 8 for receiving the drill with the larger nominal diameters between 6.5 and 10 mm with a symmetrical distribution with respect to the transverse central plane 28 of the cuboid base body 11 extending at right angles to the side surfaces 12 and 13 19, and in the other plane 27, also with a symmetrical distribution with respect to the transverse central plane 28, are the axes 24 of the 11 slots 20 for the drills with the smaller nominal diameters between 1 and 6 mm. The depth of the pockets 19 and 20 measured from the upper end face 14 is in each case a few (approx. 2 to 5 mm) greater than the length of the drills to be accommodated by the individual pockets, and the inside diameter of the pockets 19 and 20 is approximately 2/10 to 5/10 mm larger than the nominal diameter of the drill to be picked up.

Seen in the direction of arrow 29 in FIG. 4, the pockets 19 for the larger drills with the same center distances of approximately 11.5 mm according to the nominal diameters are arranged in ascending order, while the pockets 20 are arranged with the same center distance of 8 mm according to the descending order the nominal diameter are ordered. The lateral distance between the two axis planes 26 and 27 is 7 mm, the distance between the one plane 26, in which the axes of the “larger” pockets 19 lie, from the adjacent side surface 13 is 11 mm and the distance between the others

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Axis plane 27 from the side surface 12 adjacent to this is 9 mm.

The narrow end faces 14, 16, 17, 18, which connect smoothly to one another with curved 90 ° transition surfaces 30 to 33, the radius of curvature of which is approximately 8 mm, form the sliding surface for a flexible selector belt 34, which is full of through the narrow end faces 14 and 16 to 18 as well as the lateral surface of the cassette body 11 formed by the transition surfaces 30 to 33 abut, can be displaced along the latter and is guided in its displacement movement by guide ribs 36 and 37 projecting from the edges of the lateral surface on both sides.

The guide ribs 36 and 37 measured from the sliding surface have a height of approx. 4 mm and a foot width of also 4 mm. Their outer walls are flush with the side surfaces 12 and 13 of the base body 11. The distance between their mutually facing inner surfaces 38 and 39, which convey the tape guide, corresponds to the width of the selector belt 34. This selector belt has two preferably circular selector openings 40 and 41, which can be shifted appropriately of the selector belt with the mouth openings of the individual pockets 19 or 20 can be brought into a concentric position in which a selected drill can be removed from the cassette 10 through the selector opening 40 or 41. The one selection opening 40 is arranged in such a way that its center moves when the selection band is moved along the plane 26 containing the axes 23 of the pockets 19 for the larger drills. Their diameter is small, i.e. at most Vi mm larger than the diameter of the largest drill 21. The other selection opening 41 moves when the band is displaced along the plane 27 in which the axes 24 of the pockets 20 for the smaller drills lie and has a diameter which is also is slightly larger than the largest nominal diameter (6 mm) of the drills contained in these pockets 20. Seen in the longitudinal direction of the selector belt 34, the distance between the two selector openings 40 and 41 is selected such that both selector openings 40 and 41 cannot be brought into a position suitable for removing the respective drill at the same time, each with one of the insert compartments 19 or 20. This distance between the selection openings 40 and 41 is expediently chosen so that the selection band 34, a certain displacement direction of the same, must be displaced by a distance corresponding approximately to the center distance of one or the other pocket compartments 19 or 20 by which a selection opening 41 is inserted into it to bring the first position suitable for the removal of a drill after the other selection opening 40 had previously assumed its last position suitable for the removal of a drill. In the case of the cassette 10 according to FIGS. 1 to 4, this distance is approximately 10 cm.

The selector belt 34 is preferably designed as a closed belt which is elastically extensible to such an extent that it can be brought over one of the guide ribs 36 or 37 into which the base body 11 can be brought into contact with the sliding surface. The elasticity of the belt 34 required for this can also be achieved by inserting, for example in the arrangement shown in FIG. 2, a rubber-elastic section 42 of a few centimeters in length into the selector belt 34, but the remaining selector belt has no significant elasticity. The selector belt 34, which is preferably made of a thermoplastic, preferably polypropylene (PP), is smooth on its side facing the sliding surface and has grip ribs 43, which are approximately rectangular in cross-section on the outside and extend transversely to the direction of displacement, so that the belt as a whole is a roller shutter -like structure with cross-directional,

formed by the grip ribs 43 "lamellae" and intermediate film hinges 44 of lesser material thickness, which give the selector belt the required flexibility. The material thickness of these film hinges 44 is between 0.5 and 1 mm. Measured in the longitudinal direction of the selector belt 34, the film hinges 44 and the grip ribs 43 have approximately the same width of 3 to 4 mm and the material thickness of the selector belt 34 in the region of its grip ribs is approximately 3 to 4 mm. It is thus somewhat less than the height of the guide ribs 36 and 37, so that the selector belt 34 can also be moved comfortably when the cassette 10 is placed on a base 46.

On one narrow side 17 of the cassette 10, the i5 guide ribs 36 and 37 are somewhat lower than the grip ribs 43 on an area 47 comprising approximately 2/3 of their length, which enables the selector belt 34 to be moved easily with one hand, the user placing the cassette 10 on hold the opposite narrow side 18 and 20 can move the selector belt 34 in the area 47 with a lower guide rib height with the thumb.

The position of the selection openings 40 and 41 is emphasized on the one hand and on the other hand, in particular when the selection belt 34 is otherwise, emphasized by means of grip beads 45 arranged on both sides of the selection openings 40 and 41, which are designed as somewhat reinforced grip ribs in the exemplary embodiment shown in FIG. 1 is smooth, the dial-shift easier. In conjunction with diameter markers 30 arranged on the guide ribs 36 and 37, the grip beads 40 can also be advantageously used to identify the desired selection position.

In the case of the cassette 10 described so far, the cassette body 11 together with the guide ribs 36 and 37 is made as a 35 one-piece, for example made of acrylic glass or an injection-moldable, curable thermosetting plastic such as polyethylene. Alternatively, the cassette body 11 can also be formed in two or three parts in the manner shown in FIGS. 5, 6 and 7, the details of which are expressly shown, which is important both for the manufacture and for the assembly and The first loading of the cassette with the drills to be picked up is advantageous:

The cassette body 50 according to FIG. 5 differs from that according to FIGS. 2 to 4 essentially 45 by the design of its insert compartments 51 and 52 for the drills with the larger or the smaller nominal diameters, the open-edge grooves here with a U-shaped cross section comprise which are arranged on the mutually facing sides of the plate-shaped partial bodies 53 and 54 and are separated from one another by a film or thin plate 56 which is arranged between the partial bodies 53 and 54 or their grooves 51 and 52.

If, as shown in FIG. 5, the dividing wall 56 runs parallel to the side surfaces 12 and 13 of the cassette body composed in this way, the compartments 51 and 52 can be arranged in both rows according to the increasing or decreasing nominal diameters. In this case, neglecting the layer thickness of the partition, the minimum width of the guide surface required between the guide 60 ribs 36 and 37 is given by the sum of the diameters of the largest drills in each of the two rows of pockets 51 and 52. This minimum width is then at selected special case example 16 mm. If one sees for each of the partial bodies 53 and 54, a wedge-shaped design indicated in dashed lines in FIG. 5, with the insert compartments 51 and 52 being arranged once according to descending and once ascending nominal diameters, then the minimum is mentioned

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width is equal to the larger value of the sum of nominal diameters, if one adds the nominal diameter of the largest drill of the one group of pocket compartments to the nominal diameter of the smallest drill of the other group of pocket compartments. In the selected case example, this minimum value is then 12.5 mm. The material saving for the cassette body that is possible hereafter can of course also be used in connection with a one-piece cassette body, as explained with reference to FIGS. 2 to 4.

For the fixed connection of the partial bodies 53 and 54 and the separating film or plate 56, screw connections can be provided which pass through openings of these parts which are aligned with one another in the corner regions of the cassette body 50. The two partial bodies 53 and 54 can also be connected to one another or to the partition wall 56 by gluing or welding. For quick assembly of the cassette 50, plug connections 57 with the structure shown in FIG. 6, which shows a pair of such plug connections, are also suitable. One partial body 53 has plate-shaped projections designed as resilient tabs 58, which can be inserted through openings 59 of the partition 56 into continuous slots 60 of the opposite partial body 54. The resilient tabs 58 have on the opposite sides of their free ends projecting, in cross-section approximately trapezoidal locking strips 61, the inner, with the adjoining tab surface 62 enclosing an obtuse angle of approximately 120 ° inclined surfaces 63 in the inserted state, a correspondingly inclined inclined surface Reach behind step surface 64 of an outer extension 66 of slots 60. The outer inclined surfaces 67 of the latching strips 61 facilitate the insertion of the resilient tabs 58 into the slots 60, the clear width of which is dimensioned sufficiently large that the tabs which sag when inserted can be brought into their engagement position. Due to the inclination of the inner inclined surfaces of the locking edges 61 and the inclined surfaces 64 of the slot extensions 66 that are engaged by them, it is achieved that the two partial bodies 53 and 54 are pulled towards one another as soon as the locking edges 61 enter the extension 66 of the slots 60, and that one too with slightly different thicknesses of the partition 56, a firm connection of the partial bodies 53 and 54 is achieved.

Finally, FIG. 7 shows a cassette 70 with a solid, plate-shaped middle part 71 and attached flat-plate-shaped side parts 72 and 73, the edges 74 and 76 of which protrude beyond the narrow end faces of the middle part 71, the guide ribs for the in FIG. 7 forming selector belt, not shown. The cassette 70 also has two rows of pockets 77 and 78 for the larger and smaller drills of an HSS twist drill set, these pockets 77 and 78 in turn having the particularly space-saving arrangement explained in connection with the cassette according to FIG. 5. Here, too, the recesses receiving the drills are formed by open-edged grooves with a U-shaped clear cross section, which are arranged on the opposite sides of the central part 71 and are closed to the outside by the side parts 72 and 73. An expansion of this two-row cassette to a three-row or multi-row cassette is possible in that, in the manner shown in dashed lines, a further cassette body 79 is attached to one side part 76, its insert compartments 80 in connection with those in the insert compartments 77 and 78 of the first cassette body included HSS drills usable taps for example for the common threads M3-M10. In the design of such an expanded cassette 70 shown in FIG. 7, two selection tapes would then be required. However, it would also be possible to fasten the middle part 71 and the further cassette body 79 directly to one another and to use a single selector belt with three appropriately staggered selector openings. The individual parts of the cassette 70 can be produced particularly efficiently due to their simple shape.

The above-described designs of the cassette according to the invention are particularly suitable for production using plastic injection molding technology or else in light metal die-casting technology.

Of course, designs of the cassette are also possible in which the cassette body is at least partially made of suitably punched, bent, folded and optionally embossed sheet metal parts which are connected to one another by spot welds. The compartments can then be delimited, for example, by corrugated sheet metal strips which are arranged between two side wall sheets provided with viewing windows; the selector belt can also be designed in the manner of a roller shutter and can be composed of articulated, but inherently rigid sheet metal lamellae.

In the designs of further embodiments of a cassette 110 according to the invention shown in FIGS. 8 to 14, the design of the cassette body 11 is largely analogous to that of the cassette 10 according to FIGS. 1 to 4. To this extent, the same reference numerals are also used below for corresponding parts.

The cassette 110 according to the invention shown in FIGS. 8 to 10, to the details of which are expressly referred to, is also specially designed for accommodating a set of a total of 19 twist drills of standardized size, the nominal diameters of which are in increments of 0.5 mm between 1 and 10 mm vary.

In one plane 26 lie with a symmetrical distribution with respect to that perpendicular to the side surfaces 12 and

13 extending transverse center plane 38 of the cuboid base body, the axes of a total of 10 pockets 19, which are provided for receiving the drill with the larger nominal diameters between 10 and 5.5 mm. In the other plane 27, also with a symmetrical distribution with respect to the transverse central plane 28, are the axes 24 of the 9 pockets 20 for the drills with the smaller nominal diameters of between 1 and 5 mm, the axes 24 of the pockets 20 with the axes 23 of the Pockets 19 stand on gap. The center distance is the same in both rows and is approx. 12 mm.

The lateral distance between the two axis planes 26 and 27 is 7 mm in the special embodiment. The distance between the axis plane 26 of the “larger” pockets 19 from the adjacent side surface 13 is 12 mm and the distance between the other axis plane 27 from the adjacent side surface 12 is 10 mm.

Along the narrow end face, as shown in FIG. 8

14, a rectangular-plate-shaped selector member 133 is slidably mounted. This selector 133 is provided with side-by-side selection openings 134 and 136, each of which is assigned to one of the two rows of pockets 19 and 20 and which is brought into a concentric position by suitable displacement of the selector 133 with the mouth openings of the individual pockets 19 and 20 in which a selected drill can be removed from the cassette 10 through the selection opening 34 or 36. To facilitate the selection movement, the selector 133 preferably has a flat-concave recessed grip on its upper side, or it is ent5

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provided with raised grip ribs along its edges which run transversely to the direction of displacement.

The diameters of the two dialing openings are each small, i.e. approx. '/> mm larger than the diameter of the largest pocket 19 or 20 contained in the respective row. Seen in the direction of displacement of the selector element 133, this is arranged between two runs 137 and 138 of a cover band, the selector ends distal ends 139 and 140 of which in the arrangement shown in FIGS. 1 and 2 at a distance corresponding to approximately 2/3 of the side length a from the curved transition surfaces 31 and 32 on the narrow end faces 17 and 18 of the cassette body 11. Otherwise the two dreams lie

137 and 138 of the masking tape, which are designed as bellows-like extendable or shortenable foldable or corrugated tapes, loosely on the end faces 14, 17 and 18.

The guidance of the selector member 133 and the strands 137 and 138 of the masking tape is mediated by the guide ribs 139 and 140 projecting on both sides from the edges of the end faces 14, 17 and 18, each with a narrow edge flange 141 and 142, an edge strip of approximately 3 mm Width of the selector 133 or the dreams 137 and

Reach behind the outside of the masking tape 138 and thus prevent the masking tape from lifting off.

The clear distance between the edge flanges 141 and 142 from the end faces 14, 17 and 18 is approximately 8 mm in the exemplary embodiment shown, but can also be slightly larger or smaller depending on the nature of the masking tape used.

A suitable design of a single or both strands 137 and 138 of the masking tape as a plastic folding tape is shown in FIG. 13 in the extended state and in FIG. 14 in the folded state. In this design, the masking tape is an approximately 1.5 to 2 mm thick, e.g. made of soft PVC or polyethylene plastic tape formed, the width of which corresponds to the clear distance between the guide ribs 139 and 140. It is divided by alternating transverse grooves 143 on its upper and lower sides into segment plates 144, which in the longitudinal step have the flat-parallel-logram-shaped form shown in FIG. 13 and are connected by film hinges 146, which convey the foldability. The distance of adjacent film hinges measured in the longitudinal direction of the band is approximately 9 mm, the length 1 of the segment plates 144 measured along the longitudinal central plane 147 according to FIG. 13 is approximately 6 mm. The fold tape 143, 144 designed in this way can, as shown in FIG. 14, be folded very closely, so that such a fold tape 143, 144, which in the stretched state has a length of e.g. Has 250 mm, in the folded state only a length of about 80 mm. With the specified aspect ratio a / b of the cassette body 11, the length of the lateral end faces 17 and 18 is therefore sufficient to accommodate the masking tape strands 137 and 138 in the unfolded state, which can be extended or shortened by a length corresponding to the length of the upper end face 14 are.

The same also applies to the design of a cover band dream 137 running back and forth between the end face 17 and the opposite edge flanges 141 and 142 of the guide ribs present there shown in the left part of FIG. 8, smoothly curved in a longitudinal section In this design, it is advantageous if the masking tape consists of a thin-walled, spring-elastic material and the design of the two strands 137 and 138 is such that the relaxed state of the one strand as much as possible, eg of dream 137, as its resting position, its narrowest state of folding and that of the other dream, its most elongated condition

status corresponds. The selector 133 arranged between the two strands 137 and 138 then automatically returns to a rest position, which is expediently chosen in such a way, from a selection position into which it has been brought while extending one strand 137 and folding up the other strand 138 s. that all pockets 19 and 20 are covered in this rest position.

Such a locked position of the selector member 133 is given in the case of an arrangement of the pockets 19 and 20 according to FIG. 10, when the selector member 133 is shifted from the selector position shown in dashed lines for the largest drill 21 by 2.3 mm to the left, so that the drill 21 can no longer emerge through the selection opening 134. In the equidistant anise arrangement shown in FIG. 10, the compartments 19 and 20 and the formation of the selector 133 with two merging dial openings 134 and 136, the clear width measured in the direction of displacement of which corresponds to that of the largest pocket of the assigned row of pockets 19 and 20 respectively -20 speaks, there is no position of the selector 133, in which two drills from one of the pockets 19 or 20 would be removed simultaneously. In addition, a relatively slight displacement of the selector 133 from its position shown is sufficient to close all of the pockets 19 and 20 2s. A prerequisite for this design of the cassette 110 and its selector 133, which is favorable from the point of view of simple handling and design, is, however, a relatively large expansion of the cassette body 11 as seen in the direction of displacement of the selector 133. In contrast, a cassette 10 according to the invention with the one shown in FIG Arrangement of the pockets 19 and 20 and the training shown in Fig. 12 inres selector 133 the advantage of a significantly more compact structure.

35 The material saving compared to the exemplary embodiment according to FIG. 10 is more than 20% with an otherwise analog structure of the cassette body 11.

In the case of the cassette 110 according to FIG. 11, to the details of which reference is expressly made, the 8 pockets 19 40 for the larger drills with the nominal diameters between 10 and 6.5 mm in one pocket row and the pockets 20 for the 11 drills with the between 1 and 6 mm nominal diameters in the other row of pockets. In the row of pockets 45 for the larger drills, the center distance of adjacent pockets 19 is given by the sum of their clear radii increased by the thickness d of a partition wall present between the pockets 19. In the other row, the pockets 20 for the smaller 50 drills are arranged with an equidistant distribution of their axes 24, the axes of the pockets for the largest and the smallest drill and the axes of the pockets for the drills with the nominal diameters 6.5 and 6 mm are each arranged side by side. On the selector 55, a cover plate 151 is additionally provided, displaceably guided in the transverse direction marked by arrow 150 in FIG. 12, with which alternatively the selector opening 136 for the smaller drills or the selector opening 134 for the larger drills can be covered.

60 In order to be able to insert the selector member 133 into the U-guide grooves delimiting by the end face 14 and the guide ribs 139 and 140 and the facing edge flanges 141 and 142, it is expedient if at least one of the guide ribs 139 or 140 part 65 is one on the Cassette body 11 is attachable plate which is releasably attached to this. Such a design of the cassette 10 thus facilitates its assembly and, on the other hand, also enables it to be given in a simple manner

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if necessary, replacement of the cover band 137, 138 and / or its selector member 133.

It is also advantageous for the production of the cassette body 11 using injection molding technology if it is composed of prefabricated parts that can be glued or welded to one another along the axis planes 26 and 27, so that the insert compartments 19 and 20 are arranged through mutually opposite grooves of the essentially plate-shaped fastened together Partial bodies 152 and 153 or 153 and 154 are limited, which considerably simplifies the production of suitable injection molds.

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5 sheets of drawings

Claims (18)

646629 PATENT CLAIMS 1.Cassette for the protected storage of a set of drills and for the targeted removal of the drills, which are individually arranged in insert compartments, which can be closed by means of a covering device which has at least one opening, which is guided by guided displacements of the covering device in order to release an individual Suitable positions can be brought, characterized by the following features: a) the cassette (10) has the shape of a flat cuboid, which has at least two straight rows of parallel, one-sided open pockets (19, 20; 51, 52) for receiving drills, the pockets on one of the narrow end faces ( 14) of the cuboid; b) the narrow end faces (14, 16, 17 and 18) of the cassette body adjoin one another with 90 ° curvatures (30, 31, 32, 33) and form a sliding surface for a selector and cover band (34) which is attached to the the narrow end faces (14, 16, 17 and 18) and the curved transition surfaces (30, 31, 32 and 33) comprising the narrow lateral surface of the cuboid cassette body (11; 50) are slidably guided; c) the selector belt (34) has a number of dial openings (40; 41) corresponding to the number of rows of pockets, which can alternatively be moved by its displacement into the dialing position which releases the mouth opening of its plug-in pocket and is required for the removal of a selected drill from the respective row the diameter of the selection opening (40 or 41) assigned to each of the rows of pockets is at least equal to the larger diameter of the drill intended for receiving in the respective row and the distance between the axes of the pockets (19 or 20) is selected to be at least equal to the clear width of the selection opening (40 or 41). 2. Cassette according to claim 1, characterized in that the selection openings (40 and 41), which can be moved over one of the two rows (19 or 207), viewed in the longitudinal direction of the band (34), are at a distance from one another which is somewhat larger than the length of one of the two rows of pockets (19 or 20) measured in the direction of displacement of the band (34). 3. Cassette according to claim 2, characterized in that the cassette body (50) is formed in two parts, wherein the separating surface is a plane running between two rows of pockets (51 and 52), that the pockets (51 and 52) through on the sides facing each other grooves of the two cassette parts (53 and 54) are formed, which are offset against each other by a partition (56) inserted between the two partial bodies (53 and 54), and that the two partial bodies (53 and 54) are formed by interlocking locking means ( 57) are attached to each other. 4. Cassette according to claim 3, characterized in that the grooves (51 and 52) of the two partial bodies (53 and 54) have a U-shaped clear cross-section, and that the depth of the grooves measured at right angles to the separating surface and their depth in the direction of displacement Dial opening measured clearance is only slightly larger, for example 0.2 to 0.5 mm, than the nominal diameter of the drill to be picked up. 5. Cassette according to claim 3 or claim 4, characterized in that the grooves (51 or 52) having partial body (53 or 54 of the cassette made of a colorless transparent material and the partition (56) one between the partial body (53 and 54 ) inserted opaque Is foil or plate that has a color contrasting with the drills. 6. Cassette according to one of the preceding claims, characterized in that from the edges of the sliding surface 5 che the edge guides or ribs (36 and 37) conveying the tape guide, the height of which, measured from the sliding surface, is somewhat ok at least on the narrow side of the cuboidal cassette body (11; 70) opposite the mouth openings of the pockets (19, 20; 51, 52) is greater than the greatest thickness of the band (34). 7. Cassette according to claim 6 and 2, characterized in that a substantially plate-shaped central part (71) of the cassette body, the narrower end faces of which form the sliding surface for the selection belt (34), as a one-piece 15 plate-shaped part is formed, which is provided on its opposite sides with open edges, the slots (77 and 80) forming grooves, which are closed on the outside by the central part (71) attached flat plates (72 and 73), the over the The edges (74 and 76) form the side guide ribs for the selector belt (34). 8. Cassette according to one of the preceding claims, characterized in that the band (34) is a flexible plastic band which extends transversely to the direction of displacement. 25 fende reinforced grip ribs (43) and arranged between them, the flexibility-imparting narrow film hinges (44) and is smooth on its side facing the sliding surface. 9. Cassette according to one of the preceding claims, 30 characterized in that the selector belt (34) is provided on both sides of the selector openings (40; 41) with raised grip beads (45) extending transversely to its longitudinal direction. 10. Cassette according to one of the preceding claims, characterized in that at one of the at right angles 35 of the narrow end face (17 or 18) of the cassette body which has the opening openings (14), the height of the guide ribs (36 and 37) on a partial area (47) of 5 to 8 cm is significantly lower than the maximum thickness of the selection belt (34 ). 40 11. Cassette according to one of the preceding claims, characterized in that the selector belt (34) is a closed belt which has at least on a portion (42) of its length an elastic extensibility sufficient for application to the sliding surface. 45 12. Cassette according to one of the preceding claims, characterized in that the selector belt (34) rests on the sliding surface with a slight elastic bias. 13. Cassette according to claim 1, characterized in that the masking tape is designed as a folding tape which is divided into two strands (137, 138) which can be shortened or lengthened in total in the manner of a bellows by the distance required for the selection stroke , a selector (133) pointing the dial openings (134, 136) to 5s is arranged between the two strands (37, 38) and the ends (139, 140) of the strands (137, 138) remote from the dial member on the opposite narrow end faces (17 and 18) of the cassette body (11) are fixed, which run at right angles to the end face (14) 6o having the mouth openings. 14. Cassette according to claim 13, characterized in that ■ the strands (137, 138) of the masking tape and the selector (133) are guided between guide ribs (139, 140) which are on both sides of the end faces (14, 17 and 18) of the cassette. 65 bodies (11) are arranged to run and each have a narrow edge flange (141 or 142), each of which overlaps an edge area of the strands (137, 138) on the outside, the clear distance between the edge flanges (141, 142) from the respective end face (14, 17 or 18) of the cassette body corresponds at least to the maximum fold depth of the cover tape (137, 138). 15. Cassette according to claim 13 or 14, characterized in that the cover band (137, 138) consists of a resilient material which has a wavy structure with parallel wave peaks and valleys running transversely to its longitudinal direction. 16. Cassette according to claim 13, 14 or 15, characterized in that the folding band used as the cover band (137, 138) comprises a periodic sequence of transverse strips (144) with increased rigidity and film hinges connecting them to one another. 17. Cassette according to claim 16, characterized in that the film hinges are marked by alternately open to the outside or towards the sliding surface transverse grooves of the masking tape. 18. Cassette according to claim 13,14,15,16 or 17, with two rows of pockets, the axes of which run in two parallel longitudinal planes of the cassette, in one row the pockets for the larger drill bits and in the other row those for the smaller drills are arranged and the axes of the pockets are arranged equidistantly in both rows, seen in the longitudinal direction of the cassette or in the direction of movement of the selector belt, characterized in that the distance between the axis planes (26, 27) is at least equal to the diameter of the largest of the pockets (19) is that the axes (24) of the pockets (20) for the smaller drills are seen in the longitudinal direction of the cassette (10), with the axes (23) of the pockets (19) for the larger drills are in a gap, and that the selector belt is symmetrical with respect to its central plane perpendicular to the axis planes (26, 27) and a selector opening with the contour of an envelope of two circles has, whose center points each lie in one of the two axis planes (26, 27) and whose diameter corresponds to or is slightly larger than that of the largest of the pockets (19 or 20) of the assigned pocket row. 19. Cassette according to one of the preceding claims 13, 14, 15, 16, 17 or 18, with two rows of pockets whose axes run in parallel axis planes, the pockets for the group of drills whose nominal diameter is larger than a minimum value, in one row and the slots for the drills with the smaller nominal diameters are arranged in the other row, and the slots, viewed in the same direction in each case, are arranged in one row according to ascending diameters and in the other row according to descending diameters characterized in that the distance between adjacent pockets (19.20), if the sum of their radii is less than 70% of the diameter of the largest pocket of the respective row of pockets, is equal to the largest pocket diameter, that the distance between neighboring pockets, if their radius sum is more than 70% of the largest pocket compartment diameter in the respective row is equal to that of a constant distance d, the amount of which corresponds to the minimum thickness of the partition between the pockets (19, 20), the sum of their radii, and that on the selector belt (34) a cover plate (51) perpendicular to the direction of displacement of the selector belt is arranged to be displaceable, with which at least the central region of the mouth openings arranged along one and the other row of pockets can alternatively be covered. 20. Cassette according to one of the preceding claims, for a graded in 0.5 mm increments set of drills with sizes between 1 and 10 mm, 646 629 net that in one row the pockets (20) for 11 drills with the nominal diameters between 1 and 6 mm and in the other row those for 8 drills with the nominal diameters between 6.5 and 10 mm are arranged, that the distance the axis levels (26 and 27) of the rows of pockets are 8 mm, that the minimum thickness d of the dividing walls between the pockets (19, 20) measured along their axis planes (26 or 27) is 2 mm, and that the central axes of the largest and the smallest pocket are in a right angle to the axis planes (26 and 27) extending transverse plane are arranged side by side.