screw

Abstract

A screw (1) comprising a screw head (2), a screw shaft (3), and a substantially conical screw tip (4), having threads (5) extending along the screw shaft (3) toward the screw head (2) starting from the screw tip (4), wherein the screw (1) has at least one protrusion (6), the at least one protrusion (6) extending toward the screw shaft (3) starting from at least one point of the protrusion (6) that is furthest forward in the screwing direction (E) of the screw (1), and the screw (1) has a course corresponding to at least one section of an ellipse, the ellipse being positioned in a plane that intersects the screw shaft (3) at an angle between 15 and 75 degrees, and the height of the protrusion (6) is lower than the height of the threads (5).

Description

Technical Field

[0001] The present invention relates to a screw having the features recited in the preamble of claim 1 and a rolling jaw as recited in claim 16.

Background Art

[0002] Screws are widely used in the field of fixing technology and serve to firmly interconnect several objects. Thus, screws are used, for example, in the assembly of buildings or furniture. Screws according to the prior art comprise a screw head, a screw shaft, and a substantially conical screw tip. In addition, screws according to the prior art have threads extending along the screw shaft from the screw tip towards the screw head.

[0003] The purpose of a screw is to connect elements which may be made of the same material or different materials. For example, a screw for connecting elements made of wood is called a wood screw. Wood screws generally serve to fix or connect components made of wood or wood-like materials. For this purpose, wood screws automatically cut appropriate mating threads into the material, which helps to absorb the forces occurring on the screw. Such wood screws are screwed into the components from their tips, whereby the material of the components is displaced and sliced by the wood screws.

[0004] The main parameter for a screw is the thread extraction force or pull-out capacity. This is the holding force provided by the threads of the screw screwed into the component for the connection of the components screwed to each other. It is evident that a screw should have a design that provides a high thread extraction force.

[0005] When a screw is being screwed in, the displaced material generates pressure, which acts both on the screw being screwed in and within the material of the component. This pressure can have detrimental consequences, such as the component expanding or breaking during screwing due to the splitting effect of the screw being screwed in. Furthermore, the pressure generated during screwing leads to increased effort and / or an increased screwing torque that must be applied to tighten the screw. As a result, excessive screwing torque can cause the screw to twist as it is being screwed in, thus potentially damaging the component. Moreover, it is desirable for a screw to have a screw-out torque that exceeds its screwing torque.

[0006] When screws are threaded, conventional screws typically slice the fibers of the material into which they are threaded, thereby creating chips. These chips remain within the mating threads etched into the material of the component by the screw. This results in the disadvantage of increasing the threading torque while simultaneously decreasing the thread extraction force and unthreading torque. [Overview of the project] [Problems that the invention aims to solve]

[0007] The object of the present invention is to provide a screw and a rotary jaw for manufacturing such a screw, which further improves the mentioned properties and avoids the drawbacks of the prior art. [Means for solving the problem]

[0008] According to the present invention, this objective is achieved by providing a screw comprising a screw head, a screw shaft, and a substantially conical screw tip. In addition, the screw comprises threads extending along the screw shaft from the screw tip toward the screw head. According to the present invention, the screw has at least one protrusion, which extends toward the screw shaft from at least one point of the foremost protrusion in the screwing direction, and the screw has a course corresponding to at least one section of an ellipse. This ellipse is positioned in a plane that intersects the screw shaft at an angle between 15 and 75 degrees, and the height of the protrusion is lower than the height of the threads.

[0009] The raised portion having an elliptical course in at least some sections, and its inclination relative to the screw axis at an angle between 15 and 75 degrees, provides the advantage of creating a perforating action when the screw is driven into the constituent material such as wood. This perforating action prevents the screw from generating an excessively strong splitting action when it is driven in. As a result, some of the fibers of the constituent material are perforated along the direction of screw threading, thereby effectively preventing the constituent material from splitting when the screw is driven in.

[0010] The course of the raised portion preferably forms an ellipse that opens in the opposite direction to the screwing direction. Alternatively, the course of the raised portion forms an ellipse that opens in the direction of screwing. These configurations have the effect of preventing dusty constituent materials, such as wood chips, from accumulating within the ellipse, which can lead to increased splitting action and higher screwing torque.

[0011] According to a modified version of an alternative embodiment of the screw according to the present invention, the raised portion has a course corresponding to a perfect ellipse. As a result, the drilling action of the screw according to the present invention is improved, and the splitting action is further reduced.

[0012] The foremost point of the raised portion is preferably positioned on the screw tip. As a result, the drilling action occurs immediately when the screw is tightened, thereby effectively preventing cracking of highly unstable or easily fractured materials.

[0013] The screw preferably has two protrusions, which in either case extend toward the screw axis on both sides of the screw, starting from at least one point of each protrusion that is located furthest forward in the screwing direction, and each protrusion has a course corresponding to at least a portion of an ellipse, and each ellipse is positioned in a plane that intersects the screw axis at an angle between 15 and 75 degrees. As a result, the drilling action of the screw according to the present invention is further improved.

[0014] According to a preferred embodiment of the screw according to the present invention, the foremost points of each of the protrusions are offset from each other in the screwing direction. As a result, the protrusions enable a gradual increase in the drilling action. In addition, this prevents the increased screwing torque from having to be overcome when the screw is installed.

[0015] The courses of the raised sections can each form an ellipse opening in the opposite direction of screwing, or each can form an ellipse opening in the direction of screwing. These configurations have the effect of preventing dusty constituent materials, such as wood chips, from accumulating within the ellipses, which can lead to increased splitting action and higher screwing torque. Alternatively, the raised sections can have courses corresponding to a perfect ellipse.

[0016] Preferably, the foremost point of at least one of the raised portions is positioned on the screw tip. As a result, the drilling action occurs immediately when the screw is tightened, thereby effectively preventing cracking of very unstable or easily cracked materials. Preferably, the foremost points of both raised portions are positioned on the screw tip.

[0017] According to a modified version of a preferred embodiment of the screw according to the present invention, the courses of the ridges intersect at an intersection located in a plane containing the central axis of the screw extending through the tip of the screw. In this way, the screw is prevented from wobbling during the screwing process. Alternatively, the courses of the ridges intersect at an intersection, and the connecting line passing through the intersection is located at a certain distance from the central axis of the screw extending through the tip of the screw. As a result, wobble of the screw is induced during the screwing process, thereby reducing the screwing torque. According to a further alternative embodiment of the screw according to the present invention, the ridges do not intersect.

[0018] Furthermore, the object of the present invention is achieved by providing a rotary jaw designed for mass production of screws according to the present invention.

[0019] Advantageous embodiments of the screw according to the present invention, as well as modifications of alternative embodiments, will be described in more detail below with reference to the figures. [Brief explanation of the drawing]

[0020] [Figure 1a] This figure shows a screw according to the present invention, which includes a raised portion, and the raised portion has a semi-elliptical course that is positioned in a plane where it intersects the screw axis of the screw at a small angle. [Figure 1b] This figure shows a screw according to the present invention, which includes a raised portion, and the raised portion has a semi-elliptical course that is positioned in a plane where it intersects the screw axis of the screw at a small angle. [Figure 1c] This figure shows a screw according to the present invention, which includes a raised portion, and the raised portion has a semi-elliptical course that is positioned in a plane where it intersects the screw axis of the screw at a small angle. [Figure 1d] This figure shows a cross-section of a screw, as shown in Figure 1a. [Figure 2a] This figure shows a screw according to the present invention, which includes a raised portion, and the raised portion has a semi-elliptical course positioned in a plane that intersects the screw axis of the screw at a larger angle. [Figure 2b]A view showing a screw according to the present invention, including a raised portion, the raised portion having a semi-elliptical course arranged in a plane intersecting the screw axis of the screw at a larger angle. [Figure 2c] A view showing a screw according to the present invention, including a raised portion, the raised portion having a semi-elliptical course arranged in a plane intersecting the screw axis of the screw at a larger angle. [Figure 2d] A view showing a cross-section of the screw according to FIG. 2a. [Figure 3a] A view showing a screw according to the present invention, including a raised portion, the raised portion having a complete elliptical course arranged in a plane intersecting the screw axis of the screw at a small angle. [Figure 3b] A view showing a screw according to the present invention, including a raised portion, the raised portion having a complete elliptical course arranged in a plane intersecting the screw axis of the screw at a small angle. [Figure 3c] A view showing a screw according to the present invention, including a raised portion, the raised portion having a complete elliptical course arranged in a plane intersecting the screw axis of the screw at a small angle. [Figure 3d] A view showing a cross-section of the screw according to FIG. 3a. [Figure 4a] A view showing a screw according to the present invention, including a raised portion, the raised portion having a complete elliptical course arranged in a plane intersecting the screw axis of the screw at a larger angle. [Figure 4b] A view showing a screw according to the present invention, including a raised portion, the raised portion having a complete elliptical course arranged in a plane intersecting the screw axis of the screw at a larger angle. [Figure 4c] A view showing a screw according to the present invention, including a raised portion, the raised portion having a complete elliptical course arranged in a plane intersecting the screw axis of the screw at a larger angle. [Figure 4d] A view showing a cross-section of the screw according to FIG. 4a. [Figure 5a]This figure shows a screw according to the present invention, which includes a raised portion, the raised portion having a course in the shape of a perfect ellipse positioned in a plane that intersects the screw axis of the screw at a small angle, and the raised portion is offset along the screw axis compared to the screw shown in Figures 3a-3d. [Figure 5b] This figure shows a screw according to the present invention, which includes a raised portion, the raised portion having a course in the shape of a perfect ellipse positioned in a plane that intersects the screw axis of the screw at a small angle, and the raised portion is offset along the screw axis compared to the screw shown in Figures 3a-3d. [Figure 5c] This figure shows a screw according to the present invention, which includes a raised portion, the raised portion having a course in the shape of a perfect ellipse positioned in a plane that intersects the screw axis of the screw at a small angle, and the raised portion is offset along the screw axis compared to the screw shown in Figures 3a-3d. [Figure 5d] This figure shows a cross-section of a screw, as shown in Figure 5a. [Figure 6a] This figure shows a screw according to the present invention, which includes a raised portion, the raised portion having a course in the shape of a perfect ellipse positioned in a plane that intersects the screw axis of the screw at a larger angle, and which is offset along the screw axis compared to Figures 3a-3d. [Figure 6b] This figure shows a screw according to the present invention, which includes a raised portion, the raised portion having a course in the shape of a perfect ellipse positioned in a plane that intersects the screw axis of the screw at a larger angle, and which is offset along the screw axis compared to Figures 3a-3d. [Figure 6c] This figure shows a screw according to the present invention, which includes a raised portion, the raised portion having a course in the shape of a perfect ellipse positioned in a plane that intersects the screw axis of the screw at a larger angle, and which is offset along the screw axis compared to Figures 3a-3d. [Figure 5d] This figure shows a cross-section of a screw, as shown in Figure 5a. [Figure 7a] This figure shows a screw according to the present invention, which includes two protrusions, each having a course in the shape of a perfect ellipse, positioned in a plane that intersects the screw axis of the screw at a small angle. [Figure 7b]This figure shows a screw according to the present invention, which includes two protrusions, each having a course in the shape of a perfect ellipse, positioned in a plane that intersects the screw axis of the screw at a small angle. [Figure 7c] This figure shows a screw according to the present invention, which includes two protrusions, each having a course in the shape of a perfect ellipse, positioned in a plane that intersects the screw axis of the screw at a small angle. [Figure 7d] Figure 7a shows a cross-section of a screw. [Figure 8a] This figure shows a screw according to the present invention, which includes two protrusions, each having a course in the shape of a perfect ellipse, positioned in a plane that intersects the screw axis of the screw at a larger angle. [Figure 8b] This figure shows a screw according to the present invention, which includes two protrusions, each having a course in the shape of a perfect ellipse, positioned in a plane that intersects the screw axis of the screw at a larger angle. [Figure 8c] This figure shows a screw according to the present invention, which includes two protrusions, each having a course in the shape of a perfect ellipse, positioned in a plane that intersects the screw axis of the screw at a larger angle. [Figure 8d] This figure shows a cross-section of a screw, as shown in Figure 8a. [Figure 9a] This figure shows a screw according to the present invention, which includes two protrusions, each of which has a semi-elliptical course that is open in the opposite direction to the screwing direction and is positioned in a plane that intersects the screw axis at a small angle. [Figure 9b] This figure shows a screw according to the present invention, which includes two protrusions, each of which has a semi-elliptical course that is open in the opposite direction to the screwing direction and is positioned in a plane that intersects the screw axis at a small angle. [Figure 9c] This figure shows a screw according to the present invention, which includes two protrusions, each of which has a semi-elliptical course that is open in the opposite direction to the screwing direction and is positioned in a plane that intersects the screw axis at a small angle. [Figure 9d]This figure shows a cross-section of a screw, as shown in Figure 9a. [Figure 10a] This figure shows a screw according to the present invention, which includes two protrusions, each of which has a semi-elliptical course that is open in the opposite direction of screwing and positioned in a plane that intersects the screw axis at a larger angle. [Figure 10b] This figure shows a screw according to the present invention, which includes two protrusions, each of which has a semi-elliptical course that is open in the opposite direction of screwing and positioned in a plane that intersects the screw axis at a larger angle. [Figure 10c] This figure shows a screw according to the present invention, which includes two protrusions, each of which has a semi-elliptical course that is open in the opposite direction of screwing and positioned in a plane that intersects the screw axis at a larger angle. [Figure 10d] Figure 10a shows a cross-section of a screw. [Figure 11a] This figure shows a screw according to the present invention, which includes two protrusions, each of which has a semi-elliptical course that is open in the screwing direction and positioned in a plane that intersects the screw axis at a small angle. [Figure 11b] This figure shows a screw according to the present invention, which includes two protrusions, each of which has a semi-elliptical course that is open in the screwing direction and positioned in a plane that intersects the screw axis at a small angle. [Figure 11c] This figure shows a screw according to the present invention, which includes two protrusions, each of which has a semi-elliptical course that is open in the screwing direction and positioned in a plane that intersects the screw axis at a small angle. [Figure 11d] Figure 11a shows a cross-section of a screw. [Figure 12a] This figure shows a screw according to the present invention, which includes two protrusions, each of which has a semi-elliptical course that is open in the screwing direction and positioned in a plane that intersects the screw axis at a larger angle. [Figure 12b]This figure shows a screw according to the present invention, which includes two protrusions, each of which has a semi-elliptical course that is open in the screwing direction and positioned in a plane that intersects the screw axis at a larger angle. [Figure 12c] This figure shows a screw according to the present invention, which includes two protrusions, each of which has a semi-elliptical course that is open in the screwing direction and positioned in a plane that intersects the screw axis at a larger angle. [Figure 12d] Figure 12a shows a cross-section of a screw. [Figure 13a] This figure shows a screw according to the present invention, which includes two protrusions, each of which has a course in the shape of a perfect ellipse, open in the screwing direction and positioned in a plane that intersects the screw axis at a small angle. [Figure 13b] This figure shows a screw according to the present invention, which includes two protrusions, each of which has a course in the shape of a perfect ellipse, open in the screwing direction and positioned in a plane that intersects the screw axis at a small angle. [Figure 13c] This figure shows a screw according to the present invention, which includes two protrusions, each of which has a course in the shape of a perfect ellipse, open in the screwing direction and positioned in a plane that intersects the screw axis at a small angle. [Figure 13d] This figure shows a cross-section of a screw, as shown in Figure 13a. [Figure 14a] This figure shows a screw according to the present invention, which includes two ridges offset along the threading direction, each of which has a semi-elliptical course that opens in the opposite direction to the threading direction. [Figure 14b] This figure shows a screw according to the present invention, which includes two ridges offset along the threading direction, each of which has a semi-elliptical course that opens in the opposite direction to the threading direction. [Figure 14c]This figure shows a screw according to the present invention, which includes two ridges offset along the threading direction, each of which has a semi-elliptical course that opens in the opposite direction to the threading direction. [Figure 14d] Figure 14a shows a cross-section of a screw. [Figure 15a] This is a perspective view showing a rotary jaw for mass-producing screws according to the present invention. [Figure 15b] Figure 15a is a top view showing the rotating jaws. [Modes for carrying out the invention]

[0021] The screw 1 according to the present invention, shown in various embodiments and modifications in Figures 1a to 14d, comprises a screw head 2, a screw shaft 3, and a substantially conical screw tip 4. As is generally known to those skilled in the art of screws, the screw head 2 has a screw head drive (not shown in the figures), such as a Phillips screw, slotted screw, or Torx screw geometry. The screw head drive helps to apply torque to the screw head 2 by a suitable screwdriver tool for screwing the screw 1 according to the present invention into a workpiece or component not shown in the figures. Furthermore, the screw 1 according to the present invention has threads 5 that extend along the screw shaft 3 toward the screw head 2, starting from the screw tip 4. In this case, the threads 5 may extend along the entire screw shaft 3, or, as seen in Figures 1a and 1b, for example, the threads 5 may extend along the screw shaft 3 in only a few sections, starting from the screw tip 4. The screw 1 according to the present invention is preferably a wood screw.

[0022] According to the present invention, the screw 1 has at least one protrusion 6, which extends toward the screw shaft 3, originating from at least one point of the protrusion 6 located furthest forward in the threading direction E of the screw 1, indicated by an arrow in Figure 1a. This protrusion 6 is shown in detail, for example, in Figure 1c. Figure 1d shows a cross-section of the screw 1 in the region of the protrusion 6. The protrusion 6 has a course corresponding to at least one section of an ellipse. In this case, the ellipse is positioned on a plane that intersects the screw shaft 3 at an angle between 15 and 75 degrees. In addition, as seen in Figure 1d, the height of the protrusion 6 is lower than the height of the thread 5. The height of the thread is also called the thread height or thread depth. This is the height to which the thread turn of the thread 5 protrudes perpendicular to the threading direction E from the screw shaft 3 or the tip of the screw 4. The height of the protrusion 6 represents the height to which the protrusion 6 protrudes perpendicular to the screwing direction E from the screw shaft 3 or screw tip 4. According to a modification of an alternative embodiment, the ellipse may also be positioned in a plane that intersects the screw shaft 3 at an angle between 30 and 60 degrees.

[0023] The course of the elliptical raised portion 6 in at least some sections, and its inclination relative to the screw shaft 3 at an angle between 15 and 75 degrees, provides a drilling action when the screw 1 is screwed into a component material such as wood, while simultaneously reducing the required screwing torque. This drilling action prevents an excessively strong splitting action from acting on the component as a result of the screw 1 being pushed in. As a result, the component is effectively prevented from splitting when the screw 1 is being screwed in. The lower height of the raised portion 6 compared to the height of the screw thread 5 has the advantage that the screw thread 5 obtains sufficient engagement depth for effective forward thrust in the component material.

[0024] According to a modified embodiment of the screw 1 of the present invention, the course of the raised portion 6 can form an ellipse that opens in the opposite direction to the screwing direction E. Alternatively, the course of the raised portion 6 can form an ellipse that opens in the direction to the screwing direction E. In the screw 1 shown in Figures 1a to 1d, the course corresponds to a semi-ellipse that opens in the opposite direction to the screwing direction E. As a result, the advantage is obtained that dusty or crushed constituent material accumulated in the course of the raised portion 6 is carried away.

[0025] Figures 2a to 2d also show modified embodiments of the screw 1 according to the present invention, in which the course of the raised portion 6 corresponds to a semi-ellipse opening opposite to the screwing direction E. However, in the modified embodiments of the screw 1 according to the present invention shown in Figures 2a to 2d, the ellipse of the course intersects the screw axis 3 in a plane positioned at a larger angle than in the modified embodiments shown in Figures 1a to 2d. According to the present invention, this angle is between 15 and 75 degrees.

[0026] According to the alternative embodiments shown in Figures 3a to 5d, the raised portion 6 can also have a course corresponding to a perfect ellipse. As a result, the advantage is obtained that the drilling action occurs more rapidly and uniformly along the entire circumference of the screw shaft 3 when the screw 1 is being screwed in. In addition, it is preferable that the foremost point of the raised portion 6 is positioned on the screw tip 4. This can be seen, for example, in Figures 3b and 3c. This further increases the drilling action.

[0027] According to an alternative embodiment of the screw 1 of the present invention, the screw 1 has two protrusions 6, which in either case extend toward the screw axis 3 on both sides of the screw 1, starting from at least one point of each protrusion 6 that is located furthest forward in the screwing direction E of the screw 1, and each of the protrusions 6 has a course corresponding to at least a portion of an ellipse, and each ellipse is positioned in a plane that intersects the screw axis 3 at an angle between 15 and 75 degrees. Modifications of the embodiment of the screw 1 of the present invention designed in such a manner are shown, for example, in Figures 7a to 7d. The two protrusions 6 achieve a stronger displacement of the workpiece material when the screw 1 is screwed into the workpiece, thereby further improving the drilling action. According to the modification of the alternative embodiment, the ellipse may also be positioned in any case in a plane that intersects the screw axis 3 at an angle between 30 and 60 degrees. Generally, for example, 15 degrees, 16 degrees, 17 degrees, 18 degrees, 19 degrees, 20 degrees, 21 degrees, 22 degrees, 23 degrees, 24 degrees, 25 degrees, 26 degrees, 27 degrees, 28 degrees, 29 degrees, 30 degrees, 31 degrees, 32 degrees, 33 degrees, 34 degrees, 35 degrees, 36 degrees, 37 degrees, 38 degrees, 39 degrees, 40 degrees, 41 degrees, 42 degrees, 43 degrees, 44 degrees, 45 degrees, 46 degrees, 4 The angles between the planes at 7 degrees, 48 ​​degrees, 49 degrees, 50 degrees, 51 degrees, 52 degrees, 53 degrees, 54 degrees, 55 degrees, 56 degrees, 57 degrees, 58 degrees, 59 degrees, 60 degrees, 61 degrees, 62 degrees, 63 degrees, 64 degrees, 65 degrees, 66 degrees, 67 degrees, 68 degrees, 69 degrees, 70 degrees, 71 degrees, 72 degrees, 73 degrees, 74 degrees, and 75 degrees and the screw shaft 3 can be considered.

[0028] As can be inferred from modified embodiments of the screw 1 according to the present invention shown in Figures 7a to 7d, the foremost points of each of the protrusions 6 may be offset from each other in the screwing direction E of the screw 1. In this way, the screwing torque is prevented from increasing excessively at a certain point along the screwing direction E of the screw 1. Such a configuration can also be seen from modified embodiments of the screw 1 according to the present invention shown in Figures 8a to 8d, in which case the angle of the plane in which the ellipse of the protrusion is positioned is greater than in the modified embodiments shown in Figures 7a to 7d.

[0029] As shown in Figures 7a to 8d, the course of the raised portion 6 can in any case form a perfect ellipse. Alternatively, the course of the raised portion 6 can in any case form an ellipse that opens in or out of the threading direction E. A screw 1 constructed in this manner is shown in Figures 9a to 12d and 14a to 14d. This prevents threading from being hindered by the accumulation of stock material removed during the threading process within the ellipse.

[0030] Preferably, the foremost points of at least one or both of the raised portions 6 are positioned on the screw tip 4. This can be seen, for example, in Figures 14a to 14d. In this way, a drilling action is achieved even with a small screwing depth, thereby effectively suppressing cracking of the stock material during the initial turning of the screw 1 in the material. In Figures 14a to 14d, the foremost points of both raised portions 6 are positioned on the screw tip 4.

[0031] According to a modification of an alternative embodiment, the course of the raised portion 6 intersects at an intersection 7 located in a plane containing the screw central axis Z extending through the screw tip 4. For example, the screw 1 according to the present invention shown in Figures 9a to 13d is designed in this manner. According to a further modification of an alternative embodiment, the course of the raised portion 6 intersects at an intersection 7, and the connecting line passing through the intersection 7 is located at a certain distance from the screw central axis Z extending through the screw tip 4. A screw 1 according to the present invention designed in this manner is shown, for example, in Figures 7a to 8d and Figures 14a to 14d. When the course of the raised portion 6 intersects at an intersection 7 located in a plane containing the screw central axis Z extending through the screw tip 4, fluctuations in the screwing torque are avoided when screwing is performed. As a result, uniform effort is achieved for the user of the screw 1 according to the present invention when screwing is performed. When the courses of the raised portions 6 intersect at the intersection 7, and the connecting line passing through the intersection 7 is located at a certain distance from the screw central axis Z extending through the screw tip 4, a variable screwing torque is achieved when screwing is performed. This results in further displacement of the stock material, thereby increasing the pull-out torque compared to the screwing torque. According to a further alternative embodiment of the screw 1 according to the present invention, the raised portions 6 do not intersect. This is seen, for example, in Figures 14a to 14c. Thus, the advantage is obtained that the removal of workpiece material from the raised portions 6 is facilitated.

[0032] Figures 15a and 15b show the rotary jaw 8 according to the present invention for mass production of the screw 1 according to the present invention.

Claims

1. A screw (1) comprising a screw head (2), a screw shaft (3), and a substantially conical screw tip (4), having screw threads (5) that extend along the screw shaft (3) from the screw tip (4) toward the screw head (2), The screw (1) has at least one protrusion (6), the at least one protrusion (6) extends toward the screw shaft (3) starting from at least one point of the protrusion (6) that is located furthest forward in the screwing direction (E) of the screw (1), and the screw (1) has a course corresponding to at least one section of an ellipse, the ellipse is arranged in a plane that intersects the screw shaft (3) at an angle between 15 and 75 degrees, and the height of the protrusion (6) is lower than the height of the screw thread (5).

2. The screw (1) according to claim 1, characterized in that the course of the raised portion (6) forms an ellipse that opens in the opposite direction to the screwing direction (E).

3. The screw (1) according to claim 1, characterized in that the course of the raised portion (6) forms an ellipse that opens in the screwing direction (E).

4. The screw (1) according to claim 1, characterized in that the raised portion (6) has a course corresponding to a perfect ellipse.

5. The screw (1) according to any one of claims 1 to 4, characterized in that the foremost point of the raised portion (6) is positioned on the screw tip (4).

6. A screw (1) according to any one of claims 1 to 5, having two protrusions (6), wherein the two protrusions (6) in each case extend toward the screw axis (3) on both sides of the screw (1), starting from at least one point of each protrusion (6) that is located furthest forward in the screwing direction (E) of the screw (1), and each of the protrusions (6) has a course corresponding to at least a portion of an ellipse, and each ellipse is positioned in a plane that intersects the screw axis (3) at an angle between 15 and 75 degrees.

7. The screw (1) according to claim 6, characterized in that the foremost points of each of the raised portions (6) are offset from each other in the screwing direction (E) of the screw (1).

8. The screw (1) according to claim 6 or 7, characterized in that the courses of the raised portion (6) each form an ellipse that opens in the opposite direction to the screwing direction (E).

9. The screw (1) according to claim 6 or 7, characterized in that the courses of the raised portion (6) each form an ellipse that opens in the screwing direction (E).

10. The screw (1) according to claim 6 or 7, characterized in that the raised portion (6) has a course corresponding to a perfect ellipse.

11. The screw (1) according to any one of claims 6 to 10, characterized in that at least one of the foremost points of at least one of the raised portions (6) is positioned on the screw tip (4).

12. The screw (1) according to any one of claims 6 to 10, characterized in that the foremost points of both protrusions (6) are positioned on the screw tip (4).

13. The screw (1) according to any one of claims 6 to 12, characterized in that the course of the raised portion (6) intersects at an intersection (7) located in a plane containing the screw central axis (Z) extending through the screw tip (4).

14. The screw (1) according to any one of claims 6 to 12, characterized in that the course of the raised portion (6) intersects at an intersection (7), and the connecting line passing through the intersection (7) is located at a certain distance from the screw central axis (Z) extending through the screw tip (4).

15. The screw (1) according to any one of claims 6 to 12, characterized in that the raised portions (6) do not intersect.

16. A rotary jaw (8) characterized by being designed for mass production of a screw (1) according to any one of claims 1 to 15.

Images