AU2012101395A4

AU2012101395A4 - A screw used for screwing onto a corrugated board

Info

Publication number: AU2012101395A4
Application number: AU2012101395A
Authority: AU
Inventors: Gu-Yao Chen
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-07-30
Filing date: 2012-09-07
Publication date: 2012-10-11
Anticipated expiration: 2020-09-07
Also published as: AU2012101395B4; TWM446845U

Abstract

A screw comprises symmetrical reaming units extended outward from the shank. Each reaming unit includes a top section, a side section connected to the top section, and a bottom section connected to the side section. The side 5 section is parallel to the shank. The side section further forms a chamfered inclined surface and a cutting blade pointing in a screwing direction. When a sharp cutting edge is defined on a convergence of the side section and the bottom section, the cutting blade extends from the top section to the cutting edge to present a long cutting side section and efficiently enhance the cutting 10 strength of the reaming unit. The cutting blade is allowed to repeatedly cut the debris subjected to the cutting of the cutting edge of the reaming unit, facilitating a neater side wall of a perforation caused by the cutting and increasing a waterproof effect.

Description

Our Ref: 57991nno P/00/009 Regulation 3.2 AUSTRALIA Patents Act 1990 INNOVATION SPECIFICATION FOR AN INVENTION ENTITLED Invention title: A screw used for screwing onto a corrugated board Name of Applicant: Gu-Yao Chen Address for Service A.P.T. Patent and Trade Mark Attorneys PO Box 222 Mitcham, S.A. 5062 The invention is described in the following statement: A SCREW USED FOR SCREWING ONTO A CORRUGATED BOARD BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw, particularly to a screw used 5 for screwing onto a corrugated board. 2. Description of the Related Art Referring to Fig. 1, a conventional screw 1 used for screwing onto a corrugated board comprises a head 11 and a shank 12 stretched out from the head 11; wherein, the shank 12 includes a threaded section 121 with a plurality 10 of threads 1211 spirally arranged thereon, two symmetrical wings 122 disposed between the threaded section 121 and the head 11, and a drilling portion 123 disposed opposite to the head 11. Each wing 122 is designed sharp and reversely hooked. In use, a washer 13 is initially sleeved onto the screw 1, and then the drilling portion 123 is driven to penetrate through the corrugated board 15 2 to form a perforation 21. Then, the wings 122 keep drilling and render the perforation 21 able to provide a diameter greater than the diameter of the shank 12. When the wings 122 completely penetrate through the board 2, the washer 13 keeps compressed by the head 11 until the washer 13 is tightly fixed between the corrugated board 2 and the head 11 without moving, so as to 20 achieve a waterproof effect. However, due to the reverse-hooked configuration of the wings 122, the stress resulted from the cutting process is centered on the peak of the wings 122. The conventional screw 1 relied only on the peak of the wings 122 to cut 2 the corrugated board 2. In this manner, it is extremely hard to cut the perforation 21 with a complete side wall if the wings 122 are broken and the peaks thereof are abraded due to an external force or under an improper cutting condition. Concerning the outer sides of the wings 122 which are structured into a 5 gradual-reduced shape and the corrugated board 2 which is made of plastic, the problems attendant on the abraded peaks of the wings 122 are to decrease the cutting efficiency and incompletely cut the perforation 21. Namely, the side wall of the perforation 21 may become rough since the debris is easily to be accumulated around the periphery of the perforation 21, which may, however, 10 affect the drilling effect of the screw 1 and decrease the waterproof effect of the washer 13. Referring to Fig. 2, a further improved design of the conventional screw 3 used for screwing onto a corrugated board which comprises the elements similar to the foregoing conventional screw 1, except that each wing 15 31 is designed into the shape of an inverted triangle. This configuration allows the wings 31 to screw progressively and enlarge the bore diameter of the perforation 21 gradually in order to save labors in screwing. However, there are still some problems in the screws. For example, the structure of the screw 3 leads to the wings 31 contacting with the corrugated board 2 by a single point, 20 namely touching and cutting the board 2 by using only the edge of each wing when the wings 31 gradually penetrate through the board 2. Therefore, the upper part of the wings 31 continuingly cut the corrugated board 2 before cutting off the previous debris by the lower part of the wings 31, which leads to the 3 uncut-off debris creating continuingly. Because of the uncut-off debris, the corrugated board 2 could not be cut smoothly and the debris could not be removed effectively. The side wall of the perforation 21 may become irregular, and the uncut-off debris may also be adhered to the surface of the wings 31, 5 which inevitably affects the waterproof effect of the screw 3. SUMMARY OF THE INVENTION It is therefore the purpose of this invention to provide a screw used for screwing onto a corrugated board that has symmetrical reaming units with enhanced cutting strength and sharpness. Each reaming unit could cut the 10 corrugated board in a large area so as to enhance the waterproof effect after screwing. The screw in accordance with the present invention comprises a head, and a shank stretched out from the head; wherein, two symmetrical reaming units extended outward from the shank. Each reaming unit includes a top 15 section extending outward and defined perpendicular to the shank, a side section connected to the top section and arranged parallel to the shank, and a bottom section defined opposite to the top section and connected to the side section; wherein, at one side of the side section forms an inclined surface that is chamfered and arranged on the side section in a direction pointing opposite to a 20 screwing direction of the screw so that a sharp cutting blade is able to be defined on the side section in a direction toward the screwing direction. A sharp cutting edge is defined on a convergence of the side section and the bottom section, whereby the cutting blade is able to extend from the top section to the 4 cutting edge. Due to the configuration of the inclined surface and the cutting blade on the side section, the cutting strength of each reaming unit is effectively enhanced. Moreover, the cutting blade repeatedly and continuously cuts the debris of a corrugated board resulted from the prior cutting of the cutting edge 5 and form a perforation with a complete periphery of the side wall on the board so as to enhance the great waterproof effect after screwing. Preferably, the bottom section has one side thereof connected to the side section and the other side thereof connected to an extending portion with an outer diameter greater than an outer diameter of the shank. The extending 10 portion is arranged extendedly and pointed to the drilling portion. Preferably, the extending portion includes an extending bevel that is chamfered and arranged in a direction pointing opposite to the screwing direction and a sharp extending edge that is arranged in a direction relative to the screwing direction. 15 Preferably, the extending portion is parallel to the shank. Preferably, a curved surface is defined to connect the top section with the side section. Preferably, a non-threaded section is defined on the shank and between the head and the reaming area. 20 Preferably, a washer is disposed on the shank. The advantages of the present invention would be apparent in following embodiments with drawings, and like elements are denoted by same numerals throughout the disclosure. 5 BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing a conventional screw used for screwing onto a corrugated board; Fig. 2 is a schematic view showing a further conventional screw used for 5 screwing onto a corrugated board; Fig. 3 is a perspective view showing the first preferred embodiment of the present invention; Figs. 4-6 are schematic views showing a first preferred embodiment of the present invention in use; 10 Fig. 7 is a cross-sectional view showing the A-A section in Fig. 4; Fig. 8 is a perspective view showing a second preferred embodiment of the present invention; and Fig. 9 is a schematic view showing a second preferred embodiment of the present invention in use. 15 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts. Referring to Fig. 3, a first preferred embodiment of the present invention is shown. A screw 4 comprises a head 41, and a shank 42 connected 20 to the head 41; wherein, the shank 42 includes a threaded section 421 with a plurality of threads 4211 spirally arranged thereon, a reaming area 422 disposed between the thread section 421 and the head 41, and a drilling portion 423 disposed opposite to the head 41. In the first preferred embodiment of the 6 present invention, a non-threaded section 424 is preferably defined between the head 41 and the reaming area 422, and a washer 43 is disposed on the non-thread area 424 of the shank 42(as shown in Fig. 4). Further, at least two symmetrical reaming units 44 are extended 5 outward from the reaming area 422. Each reaming unit 44 includes a top section 441 extending outward from the shank 42 and defined perpendicular thereto, a side section 442 connected to the top section 441 and disposed parallel to the shank 42, and a bottom section 443 connected to the side section 442 and defined opposite to the top section 441; wherein, a curved surface 446 is 10 preferably defined to connect the top section 441 with the side section 442 in this embodiment. At one side of the side section 442 forms an inclined surface 4421 that is chamfered and arranged on the side section 442 in a direction pointing opposite to a screwing direction of the screw 4 so that a sharp cutting blade 4422 is able to be defined on the side section 442 in a direction toward the 15 screwing direction. Furthermore, a sharp cutting edge 444 is defined on a convergence of the side section 442 and the bottom section 443, whereby the cutting blade 4422 is able to extend from the top section 441 to the cutting edge 444, allowing the length of the cutting blade 4422 to be equal to the length of the reaming unit 422 for performing a long dimension of cutting section. 20 Referring to Fig. 4, the screw 4 is applied to screw onto a corrugated board 5. The threads 4211 are initially drilled into the corrugated board 5 to create a perforation 51 thereon. When the reaming units 44 contact with the corrugated board 5, the cutting edge 444 cuts the corrugated boards 5 first and 7 then enlarges the bore diameter of the perforation 51 to allow the remands of the reaming units 44 to screw into the corrugated board 5 continuingly. Referring to Figs. 5 and 6, because of the parallel configuration of the side section 442 and the shank 42, each cutting blade 4422 repeatedly scrapes off 5 and cuts the debris of the perforation 51 that is firstly cut by the cutting edge 444 when the cutting blade 4422 progressively contacts with the corrugated board 5 and drills into the perforation 51 so as to avoid the generation of uncut-off debris when the side section 442 continues cutting and to make the inner periphery of the side wall of the perforation 51 neater and burr-free. Because of the 10 configuration of the inclined surface 4421 of the side section 442 of the reaming unit 44, the screwing strength of the cutting blade 4422 is enhanced when the cutting blade 4422 scrapes and cuts the debris. Moreover, as shown in Fig. 7, the inclined surface 4421 is also applied to reduce the contact surface of the side section442 and the perforation 51 advantageously so that the friction 15 resistance is decreased when the cutting blade 4422 continuingly scrapes and cuts the debris of the perforation 51. By means of the side section 442 of the reaming unit 44 parallel to the shank 42 and the configuration of the cutting blade 4422 and the inclined surface 4421, the reaming units 44 are stably drilled into the corrugated board 5 to efficiently scrap off the generation of debris and 20 form the perforation 51. The cutting blade 4422 and the inclined surface 4421 can sweep away the burrs of the perforation 51 continuingly and prevent the uncut-off debris from being adhered to the perforation 51, thereby attaining a neater appearance of the side wall of the perforation 51. After screwing, the 8 washer 43 between the head 41 and the reaming area 44 can completely cover the perforation 51 to achieve the great waterproof effect. Referring to Figs. 8 and 9, the second preferred embodiment of the present invention is shown. In particular, one side of the bottom section 442 5 connected to the side section 442 and the other side thereof connected to an extending portion 445 with an outer diameter which is greater than the shank 42. Wherein, the extending portion 445 is extendedly arranged and pointed to the drilling portion 423. Preferably, the extending portion 445 is also arranged parallel to the shank 42. Moreover, the extending portion 445 includes an 10 extending bevel 4451 that is chamfered and arranged in a direction pointing opposite to a screwing direction of the screw 4 so that a sharp extending edge 4452 is able to be defined in a direction toward the screwing direction. Following the drilling of the threaded section 421 and the shank 42, the extending portion 445 is applied to ream in advance, namely having a perforation 51 with an outer 15 diameter that is greater than the shank 42, which allows the reaming unit 44 to be much easier to cut and scrape the debris off for attaining a neater periphery of a side wall of the perforation caused by the cutting and increasing a waterproof effect. To sum up, the screw used for screwing onto a corrugated board 20 makes use of a side section parallel to a shank and the configuration of the cutting blade and the inclined surface to enhance the cutting strength in screwing and allow the reaming units to stably drill into the corrugated board and form a perforation with a larger diameter. Moreover, the cutting blade 9 repeatedly and continuously scrapes the debris off to obviate the burrs of the perforation and prevent the debris from being adhered to the periphery of the perforation, thereby allowing the washer to tightly cover the perforation and increasing the waterproof effect. 5 While we have shown and described the embodiment in accordance with the present invention, it should be clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention. 10

Claims

1. A screw used for screwing onto a corrugated board comprising a head and a shank connected to said head; wherein, said shank includes a threaded section with a plurality of threads spirally arranged thereon, a reaming area 5 disposed between said thread section and said head, and a drilling portion disposed opposite to said head; said reaming area having a plurality of reaming units symmetrically and extending outward from said shank; characterized in that, each reaming unit includes a top section extending outward from said shank and defined perpendicular to said shank, 10 a side section connected to said top section and disposed parallel to said shank, and a bottom section connected to said side section and defined opposite to said top section; wherein, at one side of said side section forms an inclined surface that is chamfered and arranged on said side section in a direction pointing opposite to a screwing direction of said screw so that a 15 sharp cutting blade is able to be defined on said side section in a direction toward said screwing direction; a sharp cutting edge being defined on a convergence of said side section and said bottom section, whereby said cutting blade is able to extend from said top section to said cutting edge.

2. The screw as claimed in claim 1, wherein, said bottom section has one side 20 thereof connected to said side section and the other side thereof connected to an extending portion with an outer diameter greater than an outer diameter of said shank; said extending portion is extendedly arranged and pointed to said drilling portion. 11

3. The screw as claimed in claim 2, wherein, said extending portion includes an extending bevel that is chamfered and arranged in a direction pointing opposite to said screwing direction and a sharp extending edge arranged in a direction relative to said screwing direction. 5

4. The screw as claimed in claim 2, wherein, said extending portion is parallel to said shank.

5. The screw as claimed in claim 1, wherein, a curved surface is defined to connect said top section with said side section.

6. The screw as claimed in claim 2, wherein, a curved surface is defined to 10 connect said top section with said side section.

7. The screw as claimed in claim 1, wherein, a non-threaded section is defined on said shank and between said head and said reaming area.

8. The screw as claimed in claim 2, wherein, a non-threaded section is defined on said shank and between said head and said reaming area. 15

9. The screw as claimed in claim 1, wherein, a washer is disposed on said shank.

10. The screw as claimed in claim 2, wherein, a washer is disposed on said shank. 12