SCREW WITH STEPPED HEAD

Description

[0001] The invention relates to a screw with a head according to claim 1.

[0002] State-of-the-art screws include conical heads to ensure a secure fit in wood or hardware. They are suitable for universal use.

[0003] However, conventional screws have the following disadvantages: The conical head, when countersunk, pushes the wood fibers apart, causing the wood to split.

[0004] In the edge area, splicing leads to considerable problems with screwing.

[0005] Various manufacturers have further developed such countersunk head screws, equipping the heads with various shapes of ribs and pockets. The pockets and ribs are designed to open up the wood fibers when countersunk, thus reducing the risk of splitting. However, this can cause some of the wood fibers to tear off, or they can form splinters around the screw head, hindering the screw's ability to secure the screw.

[0006] A wood screw is known from JP 2004 108531 A.

[0007] It is therefore the object of the present invention to overcome the disadvantages of

[0008] state of the art and in particular to improve screwing in the screws.

[0009] This task is solved with the subject matter of the independent claim.

[0010] Advantageous developments of the invention are specified in the subclaims. The scope of the invention also includes all combinations of at least two of the features specified in the description, the claims, and / or the figures. Values within the specified ranges of values are also intended to be disclosed as limit values and claimable in any combination. The invention relates to a screw with a head, the head being of stepped design.

[0011] According to the invention, it is advantageously possible for the stepped design to act similarly to a punching tool when it hits a wood surface, so that wood fibers are punched through, particularly in the direction of the screw's longitudinal axis. Advantageously, hardly any wedge effect is exerted when the screw is countersunk, so that unwanted splinters cannot occur, or at least only minimally. The undesirable milling effect thus hardly occurs.

[0012] In a preferred embodiment, the head has a plurality of steps, wherein the steps are arranged one behind the other along a longitudinal axis of the screw, wherein the steps are arranged in particular directly behind one another. This arrangement advantageously allows the advantageous punching action to occur several times in succession, and it is particularly preferred that the punching action can occur directly one after the other.

[0013] In another preferred embodiment, the steps extend perpendicular to the longitudinal axis of the screw, with the lower edges of the steps, in particular, running perpendicular to the longitudinal axis. This advantageously makes it possible to achieve a particularly good punching effect, especially when the angle between the lower edges of the steps and the screwing direction or longitudinal axis of the step is 90°.

[0014] In another preferred embodiment, a conical region is provided between adjacent steps. This advantageously makes it possible to create a smooth transition between successive steps, compared to vertical steps arranged directly one behind the other, so that the punching action can occur with a lesser gradient rather than a sudden impact.

[0015] In another preferred embodiment, the head is rotationally symmetrical to the longitudinal axis of the screw. As a result, the steps, or rather the stepped configuration, are also rotationally symmetrical to the longitudinal axis. This advantageously allows the punching action to be uniform on all sides in the lateral direction of the screw.

[0016] In another preferred embodiment, the steps are arranged circumferentially around the longitudinal axis of the screw, in particular in a ring-shaped arrangement. Similar to the rotationally symmetrical design, it is also advantageously possible here for the punching action to be uniform in all lateral directions.

[0017] In another preferred embodiment, the steps are circular-cylindrical in shape and, in particular, have central openings for the application of force by a tool. This design advantageously makes it possible, on the one hand, to achieve a uniform punching action in the lateral direction and, on the other hand, to achieve a direct transfer of the force of a tool into the desired punching action.

[0018] In another preferred embodiment, the steps are designed such that a connection of outermost lateral points forms a lateral surface M, M', wherein the lateral surface M, M' has an opening angle W of 80° to 100°, preferably 90°. This advantageously makes it possible to use the screw according to the invention in conventional fittings with opening angles of 80° to 100°, so that advantageously no additional fittings need to be used.

[0019] 2 According to the invention, the head has support pieces on the steps for support in a fitting. The support pieces can advantageously improve the support in the fitting, since a larger support surface is available.

[0020] Preferably, the support pieces are arranged symmetrically with respect to the longitudinal axis. This advantageously achieves a uniform distribution of the load in the fitting.

[0021] In another preferred embodiment, the screw has at least two steps, with several support pieces arranged at each step. This advantageously allows the screw to rest more securely in the fitting.

[0022] In another preferred embodiment, the support pieces each extend at a radial angle of 10 to 50°. This achieves optimal support in the fitting, while simultaneously reducing the undesirable milling effect.

[0023] In another preferred embodiment, two of the fittings are arranged one behind the other, aligned along the longitudinal axis, at different steps, preferably at directly adjacent steps. This advantageously ensures that the loads in the fitting can be evenly absorbed.

[0024] Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments and from the drawings, each of which shows a schematic view: Figure 1 shows a head of a screw according to a first embodiment not according to the invention in a side view, Figure 2 shows the head of the Figure 1 in a perspective view, Figure 3 shows a head of a screw according to a second, non-inventive embodiment in a side view, Figure 4 shows the head of the Figure 3 in a perspective view, Figure 5 shows the head Figure 1 in a conventional fitting, Figure 6 shows a head of a screw according to a third embodiment of the invention, Figure 7 shows the head of the Figure 6 in a perspective view, Figure 8 shows the head of the Figure 6in a view from below of the head, Figure 9 shows the head Figure 6 in a conventional fitting, and Figure 10 shows a head of a screw of a fourth embodiment according to the invention in a view from below onto the head.

[0025] In the figures, advantages and features of the invention are identified by reference numerals identifying them in accordance with embodiments of the invention, wherein components or features with the same or equivalent function are identified by identical reference numerals.

[0026] Figure 1 shows a schematic side view of a head 2 of a screw 1 according to a first embodiment not according to the invention. The screw 1 is not shown in detail. Those skilled in the art know how screws, in particular wood screws, are designed. Figure 2 shows the screw 1 in a schematic perspective view.

[0027] The head 2 is rotationally symmetrical to a longitudinal axis L of the screw 1. The screw 1 extends along the longitudinal axis L from the head 2 to a front end, which is not shown.

[0028] The head 2 is stepped. In this exemplary embodiment, the head 2 has three steps 3, 3', 3".

[0029] In the Figure 1 It is further shown in dashed lines that the head 2 has a receiving opening 4 for a force application by a tool, e.g., a bit. The steps 3, 3', 3" are circular-cylindrical and have central openings for the force application of the tool.

[0030] The steps 3, 3', 3" extend perpendicular to the longitudinal axis L. The lower edges of the steps run perpendicular to the longitudinal axis L. The steps are arranged directly behind one another when viewed along the longitudinal axis L.

[0031] The screw 1 has a circular cylindrical portion 6, on which a thread (not shown) is arranged. A widening, conical portion 5 extends from this portion 6. Behind this conical portion 5 is the first step 3, behind the first step 3 is the second step 3', and behind it is the third step 3".

[0032] In the Figure 1 Furthermore, a lateral surface M of the head 2 is shown. This lateral surface M results from the connection of the outermost lateral points of the lower edges of the steps 3, 3', 3". In this exemplary embodiment, the opening angle W of the lateral surface M is 80°-100°, so that the screw 2 according to the invention can be used in conventional fittings.

[0033] Figure 3shows a schematic side view of a head 2' of a screw 1' according to a second embodiment not according to the invention. The screw 1' is not shown in detail. Those skilled in the art know how screws, in particular wood screws, are designed. Figure 4 shows the screw 1' in a schematic perspective view.

[0034] The head 2' is rotationally symmetrical to a longitudinal axis L' of the screw 1'. The screw 1' extends along the longitudinal axis L' from the head 2' to a front end, which is not shown.

[0035] The head 2' is stepped. In this exemplary embodiment, the head 2' has only two steps 3' and 3'.

[0036] In the Figure 3It is further shown in dashed lines that the head 2' has a receiving opening 4' for the application of force by a tool, e.g., a bit. The steps 3‴, 3 IV< are circular-cylindrical and have central openings for the application of force by the tool. The steps 3‴, 3 IV< extend perpendicular to the longitudinal axis L'.

[0037] In contrast to the first embodiment, this second embodiment has only two steps 3‴, 3 IV<. Between the two steps 3‴, 3 IV< extends a widening conical region 7, which widens to the diameter of the step 3 IV<.

[0038] As in the first embodiment, the screw 1' has a circular-cylindrical portion 6' on which a thread (not shown) is arranged. A widening, conical portion 5' extends from this portion 6'. Behind this conical portion 5' extends another conical portion 8, which widens toward the step 3'.

[0039] In the Figure 3 A lateral surface M' of the head 2' is also shown. This lateral surface M' results from the connection of the outermost lateral points of the lower edges of the steps 3"', 3 IV< and the conical areas 7, 8.

[0040] In this exemplary embodiment, the opening angle W' of the lateral surface M' is 80-100°, so that the screw 1' according to the invention can be used in conventional fittings.

[0041] Figure 5 shows schematically the screw 1 from the Figures 1 and 2in a conventional fitting B.

[0042] Regarding the design of the screw, please refer to the explanations on the Figures 1 and 2 This illustration shows that the screw 1 can be easily used in conventional fittings B due to the opening angle W of 80°-100° of the lateral surface M. The lower edges of the screw 1 advantageously lie against the fitting, so that no specially manufactured fittings are necessary for the screw according to the invention. The same applies analogously to the embodiment from the Figures 3 and 4 , which could also be used with conventional fittings.

[0043] Figures 6 to 9 show a head 2" of a screw 1" according to a third embodiment of the invention. Some statements regarding the embodiments described above also apply to this embodiment.

[0044] In contrast to the above-mentioned embodiments, the screw 1" has a head 2", which has a total of eight support pieces 9,9',9",9"', 9 IV<,9 V< and two in the Figure 8 shown support pieces 9 VI< ,9 VII<. All eight support pieces are in the Figure 8 which shows the head 2" in a plan view from below.

[0045] The support pieces each have a support surface which is inclined at an angle of 40° to 50° with respect to the longitudinal axis L" so that the support piece with the support surface is flush with a side edge of a fitting B ( Figure 9 ) rests on.

[0046] The support pieces 9,9',9",9‴,9 IV< , 9 V< ,9 VI< ,9 VII< ,9 VIII< ,9 IX< ,9 X< ,9 XI< ,9 XII< , 9 XIII< ,9 XIV< , 9 XV< are arranged symmetrically with respect to the longitudinal axis L".

[0047] In the Figure 8one can see that the support pieces 9,9',9",9‴,9 IV< ,9 V< ,9 VI< ,9 VII< , 9 VII< ,9 IX< ,9 X< ,9 XI< ,9 XII< ,9 XIII< ,9 XIV< ,9 XV< each extend over an angle a around the longitudinal axis L". Between adjacent support pieces 9,9',9",9‴,9 IV< ,9 V< ,9 VI< ,9 VII< ,9 VIII< ,9 IX< ,9 X< ,9 XI< ,9 XII< ,9 XIII< ,9 XIV< ,9 XV< an angle b extends.

[0048] In this particular embodiment, the angle a is approximately 10 to 30°; since the support pieces 9,9',9",9‴,9 IV< ,9 V< ,9 VI< ,9 VII< ,9 VIII< ,9 IX< ,9 X< ,9 XI< ,9 XII< ,9 XIII< , 9 XIV< ,9 XV< are arranged symmetrically, the angle b between adjacent support pieces 9,9',9",9‴,9 IV< ,9 V< ,9 VI< ,9 VII< ,9 VIII< ,9 IX< ,9 X< ,9 XI< ,9 XII< ,9 XIII< , 9 XIV< ,9 XV< is correspondingly between 60 and 80°.

[0049] Furthermore, four support pieces 9', 9", 9 IV<, 9 VI< are attached symmetrically to the step 3 V<.

[0050] The other support pieces 9,9‴,9 V< ,9 VII< are arranged on the further step 3 VI<.

[0051] The support pieces 9,9',9",9‴,9 IV< ,9 V< ,9 VI< ,9 VII< ,9 VIII< ,9 IX< ,9 X< ,9 XI< ,9 XII< ,9 XIII< , 9 XIV< ,9 XV< enable an improved fit of the 1" screw or the 2" head in fitting B, whereby the desired punching effect can still be achieved.

[0052] Figure 10shows schematically from below a view of a head 2‴ of a fourth embodiment of a screw 1"' according to the invention. This fourth embodiment essentially has the features of the third embodiment. This fourth embodiment differs from the third embodiment in that the support pieces 9 VIII< ,9 IX< , 9 X< , 9 XI< ,9 XII< ,9 XIII< ,9 XIV< ,9 XV< extend with respect to the longitudinal axis in the radial direction at a larger angle a' than in the third embodiment with the angle a. In this embodiment, the angle a' is approximately 45°.

[0053] As a result, the total contact surface of the support pieces 9 VIII< ,9 IX< , 9 X< , 9 XI< , 9 XII< ,9 XIII< ,9 XIV< ,9 XV< is larger than in the third embodiment, so that an improved fit in the fitting B can be achieved, whereas the desired punching effect is somewhat lower.

[0054] Accordingly, the angle b' between adjacent support pieces 9 VIII< ,9 IX< , 9 X< , 9 XI< ,9 XII< ,9 XIII< ,9 XIV< ,9 XV< is smaller than in the third embodiment and is also approximately 45°.

[0055] The embodiments described above serve only to illustrate the invention and in no way limit the subject matter of the invention or the idea of the invention. List of reference symbols

[0056] 1,1'1",1‴ screw 2,2',2",2‴ Head 3,3',3",3‴,3 IV< ,3 V< ,3 VI< ,3 VII< , 3 VIII< ,3 IX< ,3 X< Level 4,4' Receiving opening 5,5' conical area 6,6'," circular cylindrical area 7 conical area 8 conical area 9.9',9",9‴,9 IV< ,9 V< ,9 VI< ,9 VII< ,9 VIII< 9 IX< ,9 X< ,9 XI< ,9 XII< ,9 XIII< ,9 XIV< ,9 XV< support piece B fitting L,L',L" Longitudinal axis of the screw M, M', M" lateral surface of the head W,W',W" Angle of the lateral surface a,a',b,b' angle

Claims

1. Screw (1, 1', 1", 1‴), in particular wood screw, having a head (2, 2', 2", 2‴), characterized in that the head (2, 2', 2", 2‴) is stepped, wherein the head (2, 2', 2", 2‴) has support pieces (9, 9', 9", 9‴, 9IV, 9V, 9VI, 9VII, 9VIII, 9IX, 9X, 9XI, 9XII, 9XIII, 9XIV, 9XV) on the steps (3, 3', 3", 3‴, 3IV, 3V, 3VI, 3VII, 3VIII, 3IX, 3X) for support in a fitting (B).

2. Screw (1, 1', 1", 1‴) according to Claim 1, wherein the head (2, 2', 2", 2‴) has several steps (3, 3', 3", 3‴, 3IV, 3V, 3VI, 3VII, 3VIII, 3IX, 3X), wherein the steps (3, 3', 3", 3‴, 3IV, 3V, 3VI, 3VII, 3VIII, 3IX, 3X) are arranged one behind the other along a longitudinal axis (L, L', L") of the screw (1, 1', 1", 1‴), wherein the steps (3, 3', 3", 3‴, 3IV, 3V, 3VI, 3VII, 3VIII, 3IX, 3X) are in particular arranged directly one behind the other.

3. Screw (1, 1', 1", 1‴) according to at least one of the preceding claims, wherein the steps (3, 3', 3", 3‴, 3IV, 3V, 3VI, 3VII, 3VIII, 3IX, 3X) extend perpendicular to the longitudinal axis (L, L', L") of the screw (1, 1', 1", 1"'), wherein in particular lower edges of the steps (3, 3', 3", 3‴, 3IV, 3V, 3VI, 3VII, 3VIII, 3IX, 3X) run perpendicular to the longitudinal axis (L, L', L").

4. Screw (1, 1', 1", 1‴) according to at least one of the preceding claims, wherein a conical region (7) is formed between adjacent steps (3‴, 3IV).

5. Screw (1, 1', 1", 1‴) according to at least one of the preceding claims, wherein the head (2, 2', 2", 2‴) is formed rotationally symmetrical to the longitudinal axis (L, L', L") of the screw (1, 1', 1", 1‴), wherein the steps (3, 3', 3", 3‴, 3IV, 3V, 3VI, 3VII, 3VIII, 3IX, 3X) are arranged circumferentially around the longitudinal axis (L, L', L") of the screw, in particular annularly.

6. Screw (1, 1', 1", 1‴) according to at least one of the preceding claims, wherein the steps (3, 3', 3", 3‴, 3IV, 3V, 3VI, 3VII, 3VIII, 3IX, 3X) are circular-cylindrical in shape and have in particular centrally located openings (4, 4') for a drive of a tool.

7. Screw (1, 1', 1", 1‴) according to at least one of the preceding claims, wherein the steps (3, 3', 3", 3‴, 3IV, 3V, 3VI, 3VII, 3VIII, 3IX, 3X) are designed in such a way that a connection of outermost lateral points forms a lateral surface (M, M', M"), wherein the lateral surface (M, M', M") has an opening angle (W, W', W") of 80° to 100°, preferably 90°.

8. Screw (1, 1', 1", 1‴) according to at least one of the preceding claims, wherein the support pieces (9, 9', 9", 9‴, 9IV, 9V, 9VI, 9VII, 9VIII, 9IX, 9X, 9XI, 9XII, 9XIII, 9XIV, 9XV) are preferably arranged symmetrically with respect to the longitudinal axis (L, L', L").

9. Screw (1, 1', 1", 1‴) according to Claim 8, wherein the screw (1, 1', 1", 1‴) has at least two steps (3, 3', 3", 3‴, 3IV, 3V, 3VI, 3VII, 3VIII, 3IX, 3X), and a plurality of support pieces (9, 9', 9", 9‴, 9IV, 9V, 9VI, 9VII, 9VIII, 9IX, 9X, 9XI, 9XII, 9XIII, 9XIV, 9XV) are arranged on each step (3, 3', 3", 3‴, 3IV, 3V, 3VI, 3VII, 3VIII, 3IX, 3X).

10. Screw (1, 1', 1", 1‴) according to at least one of Claims 8 or 9, wherein the support pieces (9, 9', 9", 9‴, 9IV, 9V, 9VI, 9VII, 9VIII, 9IX, 9X, 9XI, 9XII, 9XIII, 9XIV, 9XV) respectively extend at a radial angle of 10 to 50°.

11. Screw (1, 1', 1", 1‴) according to at least one of the preceding Claims 8 to 10, wherein two support pieces (9, 9', 9", 9‴, 9IV, 9V, 9VI, 9VII, 9VIII, 9IX, 9X, 9XI, 9XII, gXIII, 9XIV, 9XV) are respectively arranged on different steps (3, 3', 3", 3‴, 3IV, 3V, 3VI, 3VII, 3VIII, 3IX, 3X) one behind the other in alignment along the longitudinal axis (L"), preferably on directly successive steps (3, 3', 3", 3‴, 3IV, 3V, 3VI, 3VII, 3VIII, 3IX, 3X).