Screw

Abstract

A screw contains: a head, a shank, and a tip. The head is configured to connect with a tool. The shank integrally extends from the head. The shank includes a screwing thread and a central axis. The tip is conical and includes a first segment and a second segment, wherein a diameter of the tip gradually decreases from the first segment to the second segment. The tip has a cone angle which is within 5 degrees to 30 degrees. The tip includes a conical drill portion having a pointed section away from the central axis. The tip further includes two chip elimination slots of different sizes, wherein two drilling edges are asymmetrical, and two cutting edges are asymmetric and are defined among the two chip elimination slots and the tip. The tip further includes a threaded guide section separated by the two chip elimination slots.

Claims

1. A screw comprising: a head configured to connect with a tool; a shank integrally extending from the head, the shank including a screwing thread surrounding around an outer wall of the shank, and the shank including a central axis extending along a center of the shank; and a tip integrally formed on an end of the shank away from the head, the tip including a first segment arranged on a first end of the tip close to the head, and the tip including a second segment arranged on a second end of the tip away from the head, wherein the tip is conical, a diameter of the tip gradually decreases from the first segment to the second segment, the tip has a cone angle which is within 5 degrees to 30 degrees, and the tip includes a conical drill portion formed on a distal end thereof and having a pointed section formed on a distal end of the conical drill portion and being away from the central axis, the tip further includes two chip elimination slots of different sizes extending from an outer rim of the tip to the pointed section of the conical drill portion, wherein two drilling edges are asymmetric and are defined among the two chip elimination slots and the conical drill portion, and the two drilling edges are connected with the pointed section, wherein an included angle between the two drilling edges is within 60 degrees to 110 degrees, and the pointed section is away from the central axis, hence two lengths of the two drilling edges are not equal, and two cutting edges are asymmetric and are defined among the two chip elimination slots and the tip, the tip further includes a threaded guide section formed between the tip and the screwing thread of the shank, wherein the threaded guide section is separated by the two chip elimination slots.

2. The screw as claimed in claim 1, wherein the cone angle is 15 degrees.

3. The screw as claimed in claim 1, wherein the included angle is 90 degrees.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG. 1 is a perspective view of a conventional screw.

[0018] FIG. 2 is a side plan view of the conventional screw.

[0019] FIG. 3 is a perspective view showing the assembly of a screw according to a preferred embodiment of the present invention.

[0020] FIG. 4 is a side plan view showing the assembly of the screw according to the preferred embodiment of the present invention.

[0021] FIG. 5 is another side plan view showing the assembly of the screw according to the preferred embodiment of the present invention.

[0022] FIG. 6 is also another side plan view showing the assembly of the screw according to the preferred embodiment of the present invention.

[0023] FIG. 7 is still another side plan view showing the assembly of the screw according to the preferred embodiment of the present invention.

[0024] FIG. 8 is a cross sectional view showing the operation of the screw according to the preferred embodiment of the present invention.

[0025] FIG. 9 is another cross sectional view showing the operation of the screw according to the preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] The present invention will be clearer from the following description when viewed together with the accompanying drawings, which show, for purpose of illustrations only, a preferred embodiment in accordance with the present invention.

[0027] With reference to FIGS. 3-7, a screw 1 according to a preferred embodiment of the present invention comprises: a head 10, a shank 20, and a tip 30.

[0028] The head 10 is configured to connect with a tool.

[0029] The shank 20 integrally extends from the head 10, the shank 20 includes a screwing thread 21 surrounding around an outer wall of the shank 20, and the shank 20 includes a central axis A0 extending along a center of the shank 20.

[0030] The tip 30 is integrally formed on an end of the shank 20 away from the head 10, the tip 30 includes a first segment 31 arranged on a first end thereof close to the head 10, and the tip 30 includes a second segment 32 arranged on a second end thereof away from the head 10, wherein the tip 30 is conical (i.e., a diameter of the tip 30 gradually decreases from the first segment 31 to the second segment 32), the tip 30 has a cone angle 1 which is within 5 degrees to 30 degrees (in this embodiment, the cone angle 1 is 15 degrees). The tip 30 includes a conical drill portion 33 formed on a distal end thereof and having a pointed section 331 formed on a distal end of the conical drill portion 33 and being away from the central axis A0. The tip 30 further includes two chip elimination slots 34 of different sizes extending from an outer rim of the tip 30 to the pointed section 331 of the conical drill portion 33, wherein two drilling edges 35 are asymmetric and are defined among the two chip elimination slots 34 and the conical drill portion 33, and the two drilling edges 35 are connected with the pointed section 331, wherein an included angle 2 between the two drilling edges 35 is within 60 degrees to 110 degrees (in this embodiment, the included angle 2 is 90 degrees), and the pointed section 331 is away from the central axis A0, hence two lengths of the two drilling edges 35 are not equal, and two cutting edges 36 are asymmetric and are defined among the two chip elimination slots 34 and the tip 30. The tip 30 further includes a threaded guide section 37 formed between the tip 30 and the screwing thread 21 of the shank 20, wherein the threaded guide section 37 is separated by the two chip elimination slots 34.

[0031] Referring to FIGS. 8 and 9, as desiring to screw the screw 1 into an object 2, the pointed section 331 of the tip 30 of the screw 1 abuts against the object 2 so that the tool is fitted or engaged with the head 10 of the screw 1, and the tool actuates the screw 1 to rotate so that the pointed section 331 drills and cuts the object 2. After the pointed section 331 is drilled into the object 2, the two drilling edges 35 and the two cutting edges 36 of the tip 30 drill and cut the object 2, thus producing chips. Thereafter, the chips are removed from the tip 30 along the two chip elimination slots 34, and the threaded guide section 37 and the screwing thread 21 of the shank 20 are screwed into the object 2, thus screwing the screw 1 with the object 2 quickly and easily.

[0032] Thereby, the screw 1 of the present invention has advantages as follow:

[0033] The pointed section 331 is away from the central axis A0, the tip 30 is conical, the two drilling edges 35 and the two cutting edges 36 are asymmetric, and two sizes of the two chip elimination slots 34 are different so that the cone angle 1 is within 5 degrees to 30 degrees, and the included angle 2 is within 60 degrees to 110 degrees, hence the screw 1 is screwed into the object 2 quickly and easily, and the chips are removed quickly. Furthermore, the screw 1 is not broken easily and is screwed into the object 2 completely.

[0034] While various embodiments in accordance with the present invention have been shown and described, it is clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.