Tools for setting gemstones

Abstract

Tool (1) for setting gemstones, comprising a clamping shaft (3) and a drill head (5), wherein the drill head (5) has a first drill section (7) with a first maximum diameter d1 and a second drill section (9) with a second maximum diameter d2, wherein the first drill section (7) has at least one first cutting edge (11a) and the second drill section (9) has at least one second cutting edge (11b), and wherein the second drill section (9) has a curved section (9a) which tapers towards the first drill section (7), and the at least one second cutting edge (11b) is formed on the curved section (9a), wherein the maximum diameter d1 of the first drill section (7) is smaller than the maximum diameter d2 of the second drill section (9), and wherein the drill head (5) has a total length L gand the first drilling section (7) has a length L1, wherein the length L1 of the first drilling section (7) is between 40% and 50% of the total length L g of the drill head (5).

Description

[0001] The present invention relates to a tool for setting gemstones.

[0002] Settings are used to secure and hold gemstones, for example, in jewelry. Different settings exist for setting gemstones. Some polished gemstones, such as brilliant-cut gemstones, have a point that extends relatively far downwards. One challenge when setting such gemstones is therefore creating sufficient space for the point.

[0003] For some settings, a practice has therefore been adopted to first drill a hole of a certain diameter into the material, which will later serve to accommodate the tip. Then, using another cutter, the stone seat is machined, which has a larger diameter than the first hole. While the stone seat is being machined, the previously created hole serves as a guide for the cutter. The stone can then be inserted into the resulting socket in the setting.

[0004] Therefore, several steps are required to create the setting. It would be desirable to simplify the process of creating gemstone settings.

[0005] CN 105965071 A1 discloses a tool for producing through-holes with a clamping shank and a drill head, wherein the drill head has curved and uncurved drill sections to prevent the formation of drill burrs when drilling through material. DE 10 2010 012 963 A1 discloses a drilling tool for drilling fiber-reinforced materials, wherein the drilling tool has a drill head with a first drill section whose length is very small compared to the length of the drill head.

[0006] It is therefore the object of the present invention to provide a tool that simplifies the setting of gemstones.

[0007] The tool according to the invention is defined by the features of claim 1.

[0008] The tool according to the invention for setting gemstones has a clamping shaft and a drill head. The drill head has a first drill section with a first maximum diameter d1 and a second drill section with a second maximum diameter d2, wherein the first drill section has at least one first cutting edge and the second drill section has at least one second cutting edge. The second drill section has a curved section that tapers towards the first drill section, and the at least one second cutting edge is formed in the curved section. The first maximum diameter d1 of the first drill section is smaller than the second maximum diameter d2 of the second drill section, and wherein the drill head has a total length Lg and the first drill section has a length L1, wherein the length L1 of the first drill section is between 40% and 50% of the total length Lg of the drill head.

[0009] The first drilling section is arranged on the side of the second drilling section facing away from the clamping shaft.

[0010] According to the invention, the curved section has a surface that has a curved profile toward the first drilled section. In principle, the curvature of the curved section can also be formed by arranging flat sections of different pitches. The surface can thus also have a discontinuous curved profile.

[0011] The curvature of the curved section can be radiused or elliptical in shape.

[0012] Because the at least one second cutting edge is arranged in the curved section, the at least one second cutting edge has an arcuate shape or a shape corresponding to the shape of the curved section. The tool according to the invention for setting gemstones enables both the drill hole for receiving the tip of a gemstone and the stone seat to be produced in a single operation. The drill hole for receiving the tip of the gemstone is drilled through the first drill section. The stone seat is milled out using the second drill section.

[0013] The tool according to the invention is a rotating tool.

[0014] The tool according to the invention thus makes it possible to create a setting for a gemstone in a simple and quick manner, since two different work steps are combined into one work step and a change of tools, as is necessary in the prior art, can be dispensed with.

[0015] By forming the second drilling section with a curved section having the at least one second cutting edge, the stone seat is formed with a curved wall against which the gemstone can advantageously clamp itself during setting.

[0016] Several first and / or second cutting edges can be provided on the drill head of the tool according to the invention, for example 2 or 3 each.

[0017] Preferably, the first drilling section has a drill bit, and the at least one first cutting edge is formed on the drill bit, wherein the drill bit preferably has an angle between 100° and 120°, particularly preferably 110°. Such a configuration of the first drilling section enables advantageous drilling using the first drilling section. For settings in which the setting receptacle is designed as a blind hole and thus does not penetrate the entire material, such a drill bit is advantageous in order to create sufficient space for the tip of the stone.

[0018] Preferably, the at least one first cutting edge and the at least one second cutting edge have a common chip surface. In other words, a jointly formed chip surface extends from the first drilling section into the second drilling section. Such a configuration of the drill head of the tool according to the invention has proven particularly advantageous, since advantageous chip removal occurs. Furthermore, the first and second cutting edges can be manufactured in an advantageous manner.

[0019] The at least one first and at least one second cutting edge can each be formed by a sharpened edge, each formed by a recess or a common recess. The recess can be a chip groove, for example. The chip surface can be formed in the common recess.

[0020] Preferably, a transition section is formed between the clamping shank and the drill head, which tapers towards the drill head at least in one area. The chip surface can extend into the transition section. This enables advantageous chip removal, allowing the drill head to penetrate completely or almost completely into the material.

[0021] The tapered transition section allows the clamping shank, for example, to have a significantly larger diameter than the drill head, allowing the clamping shank to be connected to existing drive machines while also providing greater stability. Furthermore, the tapered section allows a better view of the machining area, allowing the tool user to better monitor the machining process.

[0022] The transition section can have a taper angle between 3° and 5°. The taper angle is preferably 4°. The transition section thus has the shape of a truncated cone, wherein the taper angle corresponds to the opening angle of the truncated cone. The transition section can also have multiple sections that extend, for example, at different taper angles. The transition section or a section of the transition section can also have a constant diameter. It can also be provided that the transition section or a section of the transition section has a curvature with a constant radius in the longitudinal direction of the tool. In this case, the transition section thus has the shape of a concave truncated cone, for example. The curvature can, for example, have a radius of 50 mm.

[0023] Preferably, the drill head has a groove at its end facing the clamping shaft, which delimits the second drilling section. The groove serves as a depth marker, so that when using the tool according to the invention, a visual indication is provided for reaching the depth required, for example, for setting a gemstone.

[0024] In a preferred embodiment of the tool according to the invention, the ratio of the first diameter d1 of the first drilling section to the maximum diameter d2 of the second drilling section is at least 0.25 and at most 0.75. Preferably, d1 / d2 = 0.5.

[0025] Such a ratio of the first diameter to the second diameter has proven to be particularly advantageous for the setting of diamonds.

[0026] In the tool according to the invention, the following applies to the length L1 of the first drilling section: 0.4 ≤ L1 / d1. Preferably, the following applies: 0.4 ≤ L1 / d1 ≤ 0.7, particularly preferably 0.5 ≤ L1 / d1 ≤ 0.55.

[0027] The length L1 of the first drill section includes the drill bit. Designing the first drill section with this length L1 is advantageous for setting gemstones with a point, especially for brilliant-cut gemstones.

[0028] The total length L g of the drill head is, for example, the length from the drill tip of the first drilling section to the groove or to the transition section.

[0029] In a preferred embodiment of the tool according to the invention, it is provided that the at least one first cutting edge runs at a first angle to a longitudinally extending center plane of the drill head and the at least one second cutting edge runs at a second angle to the center plane, wherein the first angle is not equal to the second angle. For example, in the case of a drill head rotating counterclockwise in a plan view of the drill head, the first angle of the first cutting edge to the center plane, measured in the mathematically negative sense, can be smaller than the correspondingly measured second angle of the second cutting edge, wherein none of the cutting edges runs in the center plane and the center plane does not run between the first and second cutting edges. It has been found that with a drill head with cutting edges at different angles, improved smoothness during drilling can be achieved.

[0030] Within the scope of the invention, a length is understood to mean an extension that extends in the longitudinal direction of the tool and thus in the direction of the tool's central axis. Within the scope of the invention, a maximum diameter is understood to mean the maximum extension of the drill section in the diameter direction, i.e., the nominal diameter of the corresponding drill section, and thus the diameter of the drill section without taking into account the recess of the corresponding cutting edge. Based on the nominal diameter, the diameter of the hole created with the corresponding drill section can be estimated.

[0031] Preferably, the at least one first cutting edge and / or the at least one second cutting edge have at least one interruption. The interruption causes the chip removed by the cutting edge to break.

[0032] Preferably, the rake face extends at an angle between 0° and 20° to a central axis of the drill head. Preferably, the rake face extends at an angle between 4° and 6°, for example, at an angle of 5°, to the central axis of the drill head. This type of cutting edge arrangement has proven particularly advantageous for creating the holders for the sockets.

[0033] In a preferred embodiment of the tool according to the invention, the at least one first cutting edge and / or the at least one second cutting edge have a chamfer. This can increase the stability of the cutting edge.

[0034] In a preferred embodiment, the tool is made of steel or a hard metal. The tool according to the invention can also have a coating applied at least in the area of the drill head. The coating can consist of a metal, a metal alloy, or be a carbon layer. For example, the coating can be a titanium nitride layer or a DLC (diamond-like carbon) layer.

[0035] The invention further relates to the use of a tool according to the invention for setting gemstones.

[0036] The invention is explained in more detail below with reference to the following figures.

[0037] It shows Fig. 1 shows a first embodiment of a tool according to the invention for setting gemstones, Fig. 2 a second embodiment of the tool according to the invention for setting gemstones, Fig. 3 a third embodiment of a tool according to the invention for setting gemstones and Fig. 4 a top view of the drill head of the Fig. 3 shown embodiment.

[0038] In Fig. 1 shows a first embodiment of a tool 1 according to the invention for setting gemstones schematically in a side view.

[0039] The tool 1 according to the invention has a clamping shank 3 and a drill head 5. The drill head 5 consists of a first drill section 7 and a second drill section 9. The first drill section 7 has a drill tip 7a. The drill tip 7a extends at an angle α, which is, for example, 120°. The second drill section 9 has a curved section 9a that tapers towards the first drill section 7.

[0040] The first drilling section 7 has a first cutting edge 11a arranged at the drill tip, and the second drilling section 9 has a second cutting edge 11b arranged at the curved section 9a. The second cutting edge 11b has an arcuate shape.

[0041] The first cutting edge 11a and the second cutting edge 11b have a common chip surface 11c. Chips can be removed via the chip surface 11c when using the tool 1 according to the invention.

[0042] A transition section 13 is formed between the clamping shank 3 and the drill head 5, which tapers in a first region 13a and extends with a constant diameter in a second region 13b. The chip surface 11c extends into the transition section 13, thereby simplifying chip removal.

[0043] The curved section 9a has a curvature with a constant radius. The second drilling section has Fig. 1 essentially has the shape of a spherical layer.

[0044] The first drilling section 7 has a first maximum diameter d1, which is smaller than the maximum diameter d2 of the second drilling section. The maximum diameter of the first or second drilling section is understood to be the maximum extension in a direction transverse to a central axis 17 of the drill head 5. Fig. 1, the maximum diameter d2 of the second drilling section 9 corresponds to the diameter of the second region 13b of the transition section 13.

[0045] For the ratio of the first diameter d1 to the maximum diameter D2, the Fig. In the embodiment shown in Figure 1: d1 / d2=1 / 2.

[0046] The first drilling section 7 further has a length L1, the length extending from the drilling tip 7a to the second drilling section 9.

[0047] The drill head 5 can have a total length L G The total length L G is measured from the drill tip to the area of the second drill section 9 in which the second drill section 9 reaches the maximum diameter d2. The length L1 can, for example, be one-third of the total length of the drill head.

[0048] The chip surface 11c is arranged at an angle δ to the central axis 17 of the drill head 5, which is, for example, 5°.

[0049] In Fig. 2 shows a second embodiment of the tool 1 according to the invention for setting gemstones schematically in a side view.

[0050] The Fig. The embodiment of the tool 1 according to the invention shown in Figure 2 differs from the embodiment of Fig. 1 in that the second drilling section 9 has a spherical ring shape. The second drilling section 9 tapers, on the one hand, with the curved section 9a toward the first drilling section 7 and, on the other hand, toward the transition section 13, wherein the second drilling section 9 has a constant radius.

[0051] The Fig. The shape of the second drilling section 9 shown in Figure 2 has particular advantages with regard to chip evacuation. Furthermore, it provides a favorable view of the work area, as the user can see exactly how deeply the tool has penetrated the material.

[0052] The transition section 13 tapers in the Fig. 2, from the shaft 3 to the drill head 5, wherein the transition section 13 has a curvature with a constant radius R in the longitudinal direction of the tool. In other words, the transition section 13 has the shape of a concave truncated cone. The radius can be, for example, 50 mm.

[0053] In the Fig. In the embodiment shown in Fig. 2, the first drilling section has a length L1 which is, for example, 0.3 times the total length L G of the drill head 5.

[0054] The further conditions and characteristics of the Fig. 2 shown tool 1 correspond to the one in Fig. 1 illustrated tool 1 according to the invention.

[0055] In Fig. 3 shows a second embodiment of the tool 1 according to the invention for setting gemstones schematically in a side view.

[0056] The Fig. The embodiment of the tool 1 according to the invention shown in Figure 3 differs from the embodiment of Fig. 1 in that the second drilling section 9 tapers on the one hand with the curved section 9a towards the first drilling section 7 and on the other hand with a frustoconical shape towards the transition section 13.

[0057] The Fig. The tool shown in Figure 3 also has a drilling head 5 with two first cutting edges 11a and two second cutting edges 11b.

[0058] In this embodiment, the chip surfaces 11c extend into the region of the second drilling section 9 which tapers towards the transition section 13 and are arranged at an angle δ to the central axis 17 of the drilling head 5, which is, for example, 20°.

[0059] The transition section 13 tapers in the Fig. 3, the transition section 13 extends from the shaft 3 to the drill head 5, wherein the transition section 13 has a curvature with a constant radius R in a first region 13a in the longitudinal direction of the tool. In other words: the first region 13a of the transition section 13 has the shape of a concave truncated cone. The radius can be, for example, 10 mm. In a second region 13b, the transition section 13 extends with a constant diameter.

[0060] The further conditions and characteristics of the Fig. 3 shown tool 1 correspond to the one in Fig. 1 illustrated tool 1 according to the invention.

[0061] In Fig. 4 is the drill head of the Fig. 3. illustrated embodiment of the tool 1 according to the invention is shown schematically in a plan view.

[0062] As from Fig. 4, the first cutting edges 11a each extend at a first angle β1 to a center plane 19 extending through the center axis 17. The second cutting edges 11b each extend at a second angle β2 to the center plane 19. The drill head rotates, as in Fig.4 is indicated by an arrow, in a top view of the drill head in an anti-clockwise direction. The first angle β1 of the first cutting edge 11a to the center plane 19, measured in the mathematically negative sense, is smaller than the correspondingly measured second angle β2 of the second cutting edge 11b, whereby none of the cutting edges 11a, 11b runs in the center plane 19 and the center plane does not run between the first and the cutting edge 11a, 11b. It has been found that with a drill head 5 with cutting edges 11a, 11b at different angles β1, β2, improved smoothness during drilling can be achieved. By cutting edges 11a, 11b at different angles β1, β2, the rake face 11c of a pair of first and second cutting edges 11a, 11b is not flat, but has two partial surfaces that also run at different angles. In this case, the rake face 11c has a kink.

[0063] The tool 1 according to the invention can be made of steel or hard metal, for example.

[0064] By means of the tool 1 according to the invention, a receptacle for a gemstone in a setting can be advantageously created, wherein the receptacle can be produced essentially in one work step.

Claims

[1] Tool (1) for setting gemstones, comprising a clamping shaft (3) and a drill head (5), wherein the drill head (5) has a first drill section (7) with a first maximum diameter d1 and a second drill section (9) with a second maximum diameter d2, wherein the first drill section (7) has at least one first cutting edge (11a) and the second drill section (9) has at least one second cutting edge (11b), and wherein the second drill section (9) has a curved section (9a) which tapers towards the first drill section (7), and the at least one second cutting edge (11b) is formed on the curved section (9a), wherein the maximum diameter d1 of the first drill section (7) is smaller than the maximum diameter d2 of the second drill section (9), and wherein the drill head (5) has a total length L gand the first drilling section (7) has a length L1, wherein the length L1 of the first drilling section (7) is between 40% and 50% of the total length L g of the drill head (5). [2] Tool according to claim 1, characterized by that the first drilling section (7) has a drilling tip (7a) and the at least one first cutting edge (11a) is formed on the drilling tip (7a). [3] Tool according to claim 2, characterized by that the drill tip (7a) has an angle between 100° and 120°. [4] Tool according to one of claims 1 to 3, characterized by that a transition section (13) is formed between the clamping shaft (3) and the drill head (5), which tapers towards the drill head (5). [5] Tool according to claim 4, characterized bythat the transition section (13) or a section of the transition section (13) has a taper angle between 3° and 5° and / or that the transition section (13) or a section of the transition section (13) has a curvature with a constant radius in the longitudinal direction of the tool and / or that the transition section (13) or a section of the transition section (13) has a constant diameter. [6] Tool according to one of claims 1 to 5, characterized by that the drill head (5) has a groove at its end directed towards the clamping shaft (3) which delimits the second drilling section (9). [7] Tool according to one of claims 1 to 6, characterized by that the ratio of the diameter d1 of the first drilling section (7) to the maximum diameter d2 of the second drilling section (9) is: 0.25 ≤ d1 / d2 ≤ 0.75, preferably d1 / d2 = 0.

5. [8] Tool according to one of claims 1 to 7, characterized bythat for the first drilling section (7) the following applies: 0.4 ≤ L1 / d1 ≤ 0.7, preferably 0.5 ≤ L1 / d1 ≤ 0.

55. [9] Tool according to one of claims 1 to 8, characterized by that the at least one first cutting edge (11a) and / or the at least one second cutting edge (11b) have at least one interruption. [10] Tool according to one of claims 1 to 9, characterized by that the at least one first cutting edge (11a) extends at a first angle (β1) to a longitudinally extending center plane (19) of the drill head (5) and the at least one second cutting edge (11b) extends at a second angle (β2) to the center plane (19), wherein the first angle (β1) is not equal to the second angle (β2). [11] Tool according to one of claims 1 to 10, characterized by that the at least one first cutting edge (11a) and / or the at least one second cutting edge (11b) have a chamfer. [12] Tool according to one of claims 1 to 11, consisting of steel or a hard metal and / or with a coating of a metal or of a metal alloy or a coating which is designed as a carbon layer, wherein the coating is applied at least in the region of the drill head (5).

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