Screw

Abstract

The invention relates to a screw having a thread and a conically tapering tip, wherein directly behind the tip a cylindrical shaft is formed and behind the shaft a thicker portion is provided.

Description

The invention relates to a screw according to Claim 1. Screws, in particular wood screws, exist in different varieties in the prior art. However, conventional screws have the following disadvantages. When conventional screws are screwed into the material, they have the disadvantage of causing the wood to split. In addition, with conventional screws, there is a high level of friction when the screws are inserted. It is therefore the object of the present invention to eliminate the disadvantages of the prior art. This object is achieved with the subject of the independent claims. Advantageous further developments of the invention are given in the dependent claims. All combinations of at least two features given in the description, claims and / or figures also fall within the scope of the invention. In the specified value ranges, values lying within the specified limits are also to be disclosed as limit values and can be claimed in any combination. The invention relates to a screw, in particular wood screw, having a thread and a tapered tip, wherein a cylindrical shaft is formed behind the tip, wherein a thickened portion is arranged behind the shaft. By virtue of the fact that a cylindrical shaft and a thickened portion are arranged behind the tip, it is advantageously possible that the material, in particular the wood, into which the screw is screwed, is cut through and splitting of the material, in particular of the wood, is reduced. The screw has a longitudinal axis in a conventional manner. The screw extends along this longitudinal axis from a head with a drive to the tip. The characteristics “behind” and “in front” are defined in such a way that the rear part of the screw is provided with the head and the front part of the screw is provided with the tip. The characteristic that the cylindrical shaft is arranged behind the tip should be understood as meaning that the cylindrical shaft is located behind the tip in the longitudinal direction as seen from the front tip. The terms “thread depth” and “pitch of the thread” are known to a person skilled in the art. The thread extends in a conventional manner between the head and the tip. A further cylindrical shank can be located between the head and the thread, which has a diameter that is larger than the core diameter of the thread. The characteristic of the core diameter of the thread is known to a person skilled in the art. The thread can extend in a conventional manner up to the front end of the tip. Alternatively, a region where there is no thread can be arranged at the front end of the tip. In one preferred embodiment, it is provided that the thickened portion is cylindrical, in particular annular, in particular circular. Alternatively, it can be provided that the thickened portion is conical, wherein the thickened portion preferably gets wider towards the tip. In general, the thickened portion can also have other spherical shapes. In another preferred embodiment, it is provided that a step is arranged behind the shaft, wherein the step is preferably arranged at an angle of 60° to 120° to the screw longitudinal axis, wherein the step is particularly preferably arranged perpendicular to the screw longitudinal axis. The provision of a step advantageously makes it possible for the wood to be widened by the step when the screw is screwed in such that the friction can be reduced when the screw is screwed in further. In another preferred embodiment, it is provided that a diameter of the thickened portion is between 10% and 50% of a thread depth of the thread. In another preferred embodiment, it is provided that the thickened portion has a length in the direction of the screw longitudinal axis, wherein the length is less than 5 times a pitch of the thread. In another preferred embodiment of the invention, it is provided that the screw has at least one further thickened portion, wherein the at least one further thickened portion is arranged on the end of the thread, preferably at the transition to a shank on a head of the screw, and / or is arranged in a region of the thread, preferably in the centre of the region. This at least one further thickened portion can be used to widen the hole or opening into which the screw is screwed. This can reduce the friction generated by the adjoining shaft. In particular, the shaft can be circular-cylindrical or polygonal. The information provided above for the thickened portion applies accordingly to the at least one further thickened portion. The at least one further thickened portion can be identical to the thickened portion. However, the at least one further thickened portion can also have a different design than the thickened portion. In another preferred embodiment of the invention, it is provided that the at least one further thickened portion is cylindrical, in particular annular, in particular circular. In another preferred embodiment of the invention, it is provided that the at least one further thickened portion is conical, wherein the at least one further thickened portion preferably gets wider towards the tip. This can widen the hole or opening, which can reduce friction in the further process. In another preferred embodiment of the invention, it is provided that a step is arranged on the at least one further thickened portion, wherein the step is preferably arranged at an angle of 60°-120° to the screw longitudinal axis, wherein the step is particularly preferably arranged perpendicular to the screw longitudinal axis. In another preferred embodiment of the invention, it is provided that a diameter of the at least one further thickened portion is between 10% and 50% of the thread depth of the thread. In another preferred embodiment of the invention, it is provided that the at least one further thickened portion has a length in the direction of the screw longitudinal axis, wherein the length is less than 5 times the pitch of the thread. The information provided about the thickened portion applies in particular in terms of the advantages and further aspects of the at least one further thickened portion. Further advantages, features and details of the invention result from the following description of preferred exemplary embodiments as well as based on the schematic drawings in which: Figure 1a schematically shows a screw according to the invention in accordance with a first embodiment, Figure 1b shows a section of the screw from Figure 1a, wherein the screw has been turned 120° clockwise about the longitudinal axis, Figure 1c shows the section of the screw from Figure 1b, wherein the screw has been turned 120° clockwise about the longitudinal axis, Figure 2a schematically shows a screw according to the invention in accordance with a second embodiment, Figure 2b shows similarly to Figure 1b a section of the screw from Figure 2a, wherein the screw has been turned 120° clockwise along the longitudinal axis, Figure 2c shows similarly to Figure 1c the section of the screw from Figure 2b, wherein the screw has been turned 120° clockwise along the longitudinal axis, Figure 3a schematically shows a screw according to the invention in accordance with a third embodiment, Figure 3b shows a section of the screw from Figure 3a, Figure 4 schematically shows a screw according to the invention in accordance with a fourth embodiment. In the figures, advantages and features of the invention are marked with reference numbers identifying these in each case according to embodiments of the invention, wherein components or features with the same or equivalent function are marked with identical reference numbers. Figures 1a, 1b and 1c schematically show a screw 1 according to the invention in accordance with a first embodiment of the invention. The screw 1 extends along a screw longitudinal axis L. At the rear end of the screw, there is a head 2 with a conventional drive for a suitable actuating tool. In front of the head, there is a cylindrical shank with a diameter, wherein the diameter of this shank is greater than the core diameter of a thread 3, which is arranged in a region 7. The region 7 with the thread 3 is located in front of the cylindrical shank as seen in the longitudinal direction L. A chamfer is arranged between the cylindrical shank and the region 7 with the thread 3 such that the wider diameter of the shank tapers to the core diameter of the thread 3 in the region 7. The thread 3 has a pitch P. In addition, the thread 3 has a thread depth t. Furthermore, the screw 1 extends up to a front end, where there is a tapered tip 4. A cylindrical shaft 5, the length a of which is less than the pitch P of the thread 3, extends behind the tip 4. A cylindrical thickened portion 6 is arranged behind the cylindrical shaft 5, wherein the length a of the thickened portion 6 is less than the pitch P. A step 8 is arranged between the cylindrical shaft 5 and the cylindrical thickened portion 6, wherein, in this exemplary embodiment, this step 8 is arranged at an angle of 90° to the longitudinal axis L. Behind the cylindrical thickened portion 6, there is the region 7 with the thread 3, wherein the core diameter of the thread 3 is smaller than the diameter of the thickened portion 6. In this exemplary embodiment, the thread 3 extends in the longitudinal direction L beyond the thickened portion 6 and also beyond the cylindrical shaft 5 to the front end of the tip 4. Detail views and rotated views are shown in Figures 1b and 1c. Figures 2a, 2b and 2c schematically show a second embodiment according to the invention of the present invention. The screw 1‘ extends along a screw longitudinal axis L as in the first embodiment from a head 2 with a drive to a tapered tip 4 in the front region of the screw 1‘. Most of the features in the second embodiment are similar to the features and description of the first embodiment. The second embodiment has the following differences compared to the first embodiment. As in the first embodiment, the screw 1‘ has a thickened portion 6‘. In contrast to the first embodiment, the thickened portion 6‘ is conically widening, wherein the diameter of the thickened portion 6‘ gets bigger towards the tip. The conical thickened portion 6‘ thus starts in its rear region with the diameter of the core diameter of the thread 3 and widens into a larger diameter. As in the first embodiment, behind the tip 4, there is the cylindrical shaft 5 with an extension in the longitudinal direction L that is less than the pitch P of the thread 3. As in the first embodiment, there is a step 8‘ between the cylindrical shaft 5 and the thickened portion 6‘, wherein the step 8‘ extends at any angle of 90° to the longitudinal axis L. The thickened portion 6‘ extends in the longitudinal direction L along a length a, wherein the length a in this exemplary embodiment is less than the pitch P of the thread 3. For the rest, reference is made to the explanations on the first embodiment. Figures 2b and 2c show rotated views of the front region of the screw 1‘ with the tip 4. Figure 3a schematically shows a screw 1‘‘ according to the invention in accordance with a third embodiment. The screw 1‘‘ has a thickened portion 6‘ according to the invention on the tip 4, which is similar to the design in Figures 2a-2c in this example. In this respect, reference is made to the explanations on these figures. In this preferred exemplary embodiment, the screw 1‘‘ has a further thickened portion 6‘‘, which is arranged on the rear end of the region 7 with the thread 3 and is arranged at the transition to a shank 9, wherein the shank 9 can be cylindrical or polygonal, for example. In this special embodiment, the further thickened portion 6‘‘ is similar in design to the thickened portion 6‘ on the tip 4; in this respect, reference is made to the explanations on Figures 2a-2c. The further thickened portion 6‘‘ thus widens conically towards the tip 4. Thanks to the further thickened portion 6‘‘, this embodiment has the advantage that the opening into which the screw 1‘‘ is screwed is widened by the further thickened portion 6‘‘ before the shank 9 reaches the opening, which can significantly reduce friction and resistance. Figure 3b shows a section of the screw 1‘‘ from Figure 3a, which is marked with a circle in Figure 3a. Figure 3b shows that the diameter D4 of the shank 9 is smaller than the maximum diameter D3 of the further thickened portion 6‘‘. As a result, the opening into which the screw is screwed is advantageously widened. Further shown is the core diameter D1 of the region 7 with the thread 3, as well as the thread diameter D2 of the thread 3. The further thickened portion 6‘‘ extends along a length a‘ and widens out at an angle v. The angle v is the angle between the extensions of the outer contour of the further thickened portion 6‘‘. The angle v is 5-30 °. In addition, a step 8‘‘, which runs perpendicular to the longitudinal axis L of the screw 1‘‘, extends at the front end of the further thickened portion 6‘‘. The maximum diameter D3 is at this step 8‘‘. Figure 4 schematically shows a screw 1‘‘‘ according to the invention in accordance with a fourth embodiment. Similarly to the embodiment of Figures 3a and 4b, the screw has a conical thickened portion 6‘ in the region of the tip 4. Furthermore, the screw 1‘‘‘ has a further thickened portion 6‘‘ in the rear part of the region 7 with the thread 3 at the transition to the shank 9. In this respect, reference is made to the above explanations. In this special embodiment, the screw 1‘‘‘ has a further third thickened portion 6‘‘‘ , which is arranged centrally in the region 7 with the thread 3. This embodiment thus has a total of three thickened portions 6‘, 6‘‘, 6‘‘‘. The third thickened portion 6‘‘‘ extends in the direction of the longitudinal axis L along a length a‘‘ and widens out conically towards the tip 4 at an angle v‘. The angle v‘ is 5-30 °. The angle v‘ is the angle between the extensions of the outer contour of the further thickened portion 6‘‘‘. The third thickened portion 6‘‘‘ has a maximum diameter of D3‘ at the widest point. Diameter D3‘ is larger than diameter D1 of the region 7. In addition, a step 8‘‘‘, which runs perpendicular to the longitudinal axis L of the screw 1‘‘‘, extends at the front end of the third thickened portion 6‘‘‘. The maximum diameter D3‘ is at this step 8‘‘‘. The exemplary embodiments set out above merely serve to illustrate the invention and to provide a better understanding of the basic idea. The exemplary embodiments are in no way intended to limit the general idea of the invention. Reference list 1,1‘,1‘‘,1‘‘‘ Screw 2 Head 3 Thread 4 Tip 5 Cylindrical shaft 6,6‘,6‘‘,6‘‘‘ Thickened portion 7 Region 8,8‘,8‘‘,8‘‘‘ Step 9 Shank L Screw longitudinal axis P Pitch t Thread depth a,a‘,a‘‘ Length v,v‘,w Angle D1,D2,D3,D3‘,D4 Diameter

Claims

1. Screw (1,1‘1‘‘,1‘‘‘), in particular wood screw, having a thread (3) and a tapered tip (4), characterized in that a cylindrical shaft (5) is formed behind the tip (4), wherein a step (8,8‘) and a thickened portion (6,6‘) are arranged behind the shaft (5), wherein a core diameter of the thread (3) is smaller than a diameter of the thickened portion (6), wherein the step (8,8‘) is arranged at an angle (w) of 60°-120° to a screw longitudinal axis (L), wherein behind the thickened portion (6), there is a region (7) with a thread.

2. Screw (1,1‘1‘‘,1‘‘‘) according to Claim 1, wherein the thickened portion (6) is cylindrical, in particular annular, in particular circular.

3. Screw (1,1‘1‘‘,1‘‘‘) according to Claim 1, wherein the thickened portion (6‘) is conical, wherein the thickened portion (6‘) preferably gets wider towards the tip (4).

4. Screw (1,1‘1‘‘,1‘‘‘) according to at least one of the preceding claims, wherein the step (8,8‘) is arranged perpendicular to the screw longitudinal axis (L).

5. Screw (1,1‘1‘‘,1‘‘‘) according to at least one of the preceding claims, wherein a diameter of the thickened portion (6,6‘) is between 10% and 50% of a thread depth (t) of the thread (3).

6. Screw (1,1‘1‘‘,1‘‘‘) according to at least one of the preceding claims, wherein the thickened portion (6,6‘) has a length (a) in the direction of the screw longitudinal axis (L), wherein the length (a) is less than 5 times a pitch (P) of the thread (3).

7. Screw (1,1‘1‘‘,1‘‘‘) according to at least one of the preceding claims, having at least one further thickened portion (6‘‘,6‘‘‘), wherein the at least one further thickened portion (6‘‘,6‘‘‘) is arranged on the end of the2023369862   24 Jun 2026thread (3), preferably at the transition to a shank (9) on a head (2) of the screw (1,1‘1‘‘,1‘‘‘), and / or is arranged in a region (7) of the thread (3), preferably in the centre of the region (7).

8. Screw (1,1‘1‘‘,1‘‘‘) according to claim 7, wherein the at least one further thickened portion (6‘‘,6‘‘‘) is cylindrical, in particular annular, in particular circular.

9. Screw (1,1‘1‘‘,1‘‘‘) according to claim 7, wherein the at least one further thickened portion (6‘‘,6‘‘‘) is conical, wherein the at least one further thickened portion (6‘‘,6‘‘‘) preferably gets wider towards the tip (4).

10. Screw (1,1‘1‘‘,1‘‘‘) according to at least one of the preceding claims 7 to 9, wherein a step (8‘‘,8‘‘‘) is arranged on the at least one further thickened portion (6‘‘,6‘‘‘), wherein the step (8‘‘,8‘‘‘) is preferably arranged at an angle of 60°-120° to the screw longitudinal axis (L), wherein the step (8‘‘,8‘‘‘) is particularly preferably arranged perpendicular to the screw longitudinal axis (L).

11. Screw (1,1‘1‘‘,1‘‘‘) according to at least one of the preceding claims 7 to 10, wherein a diameter (D3,D3‘) of the at least one further thickened portion (6‘‘,6‘‘‘) is between 10% and 50% of a thread depth (t) of the thread (3).

12. Screw (1,1‘1‘‘,1‘‘‘) according to at least one of the preceding claims 7 to 11, wherein the at least one further thickened portion (6‘‘,6‘‘‘) has a length (a‘,a‘‘) in the direction of the screw longitudinal axis (L), wherein the length (a‘,a‘‘) is less than 5 times a pitch (P) of the thread (3).

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