CA2708419A1 - Crack-proof screw - Google Patents
Crack-proof screw Download PDFInfo
- Publication number
- CA2708419A1 CA2708419A1 CA2708419A CA2708419A CA2708419A1 CA 2708419 A1 CA2708419 A1 CA 2708419A1 CA 2708419 A CA2708419 A CA 2708419A CA 2708419 A CA2708419 A CA 2708419A CA 2708419 A1 CA2708419 A1 CA 2708419A1
- Authority
- CA
- Canada
- Prior art keywords
- angle
- thread
- rod
- head
- expanding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000005553 drilling Methods 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 description 3
- 239000002023 wood Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- -1 woods Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
- F16B25/001—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed
- F16B25/0015—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed the material being a soft organic material, e.g. wood or plastic
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
- F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
- F16B25/0042—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw
- F16B25/0057—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw the screw having distinct axial zones, e.g. multiple axial thread sections with different pitch or thread cross-sections
- F16B25/0063—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw the screw having distinct axial zones, e.g. multiple axial thread sections with different pitch or thread cross-sections with a non-threaded portion on the shaft of the screw
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
- F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
- F16B25/0084—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by geometric details of the tip
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
- F16B25/10—Screws performing an additional function to thread-forming, e.g. drill screws or self-piercing screws
- F16B25/103—Screws performing an additional function to thread-forming, e.g. drill screws or self-piercing screws by means of a drilling screw-point, i.e. with a cutting and material removing action
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
- F16B39/28—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by special members on, or shape of, the nut or bolt
- F16B39/282—Locking by means of special shape of work-engaging surfaces, e.g. notched or toothed nuts
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Wood Science & Technology (AREA)
- Earth Drilling (AREA)
Abstract
A crack-proof screw comprises a head; a rod having a first end extending from the head and having a rod thread near the head and expanding threads far away from the head; each expanding thread encircled through an angle smaller than 360 degrees; the screwing direction of the expanding thread being identical to or different from that of the rod thread; a tapered tail extending from a second end of the head; the expanding threads on the rod being near the tapered tail; the tapered tail having two drilling threads; each drilling thread can be extended to or not extended to the tip end of the tapered tail.
Description
"CRACK-PROOF SCREW"
FIELD OF THE INVENTION
The present invention relates to screws, and in particular to a crack-proof screw which includes a rod thread, expanding threads and drilling threads.
The screw of the present invention can drill an object quickly with less force and achieve the object of the crack-proof.
BACKGROUND OF THE INVENTION
Many design ways are used in designs of screws, such as single section, double sections, single thread, double threads, single diameter, double diameters, single pitch angle, double pitch angles, etc. All these designs present different effects in use of screws, such as the effects of drilling speeds, dregs removing, and retaining.
In the design of the screws, the designs of screws are based on the characters of the material and the object to be drilled. Generally, screws are made of different material, such as woods, plastics, metals, compound materials, etc. For a screw screwing into a wood, due to the property of the wood, it is often that the wood will crack. Thus it is necessary to have screws which have the property of crack proof.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a crack-proof screw which includes a rod thread, expanding threads and drilling threads. The screw of the present invention can drill an object quickly with less force and achieve the object of the crack-proof.
To achieve above object, the present invention provides a crack-proof screw comprising: a head having a lateral surface which is formed with an axial annular outer ring at an upper side thereof; an upper annular area of the annular outer ring being a flat ring portion and a lower annular area of the annular outer ring being a ratchet tooth area; a lower side of the lateral surface of the head being formed with ratchet teeth; a rod having a first end extending from the head and having a rod thread near the head and expanding threads far away from the head;
each expanding thread encircled through an angle smaller than 360 degrees; the screwing direction of the expanding thread being identical to or different from that of the rod thread; an angle A being defined an angle between an upper side of each expanding thread and a line vertical to a surface of the rod; an angle B being defined an angle between an lower side of each expanding thread and a line vertical to a surface of the rod; the angle B being greater than the angle A
and the summation of the angle B and angel A being equal to or greater than 90 degrees;
and a tapered tail extending from a second end of the head; the expanding threads on the rod being near the tapered tail; the tapered tail having two drilling threads;
each drilling thread can be extended to or not extended to the tip end of the tapered tail.
FIELD OF THE INVENTION
The present invention relates to screws, and in particular to a crack-proof screw which includes a rod thread, expanding threads and drilling threads.
The screw of the present invention can drill an object quickly with less force and achieve the object of the crack-proof.
BACKGROUND OF THE INVENTION
Many design ways are used in designs of screws, such as single section, double sections, single thread, double threads, single diameter, double diameters, single pitch angle, double pitch angles, etc. All these designs present different effects in use of screws, such as the effects of drilling speeds, dregs removing, and retaining.
In the design of the screws, the designs of screws are based on the characters of the material and the object to be drilled. Generally, screws are made of different material, such as woods, plastics, metals, compound materials, etc. For a screw screwing into a wood, due to the property of the wood, it is often that the wood will crack. Thus it is necessary to have screws which have the property of crack proof.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a crack-proof screw which includes a rod thread, expanding threads and drilling threads. The screw of the present invention can drill an object quickly with less force and achieve the object of the crack-proof.
To achieve above object, the present invention provides a crack-proof screw comprising: a head having a lateral surface which is formed with an axial annular outer ring at an upper side thereof; an upper annular area of the annular outer ring being a flat ring portion and a lower annular area of the annular outer ring being a ratchet tooth area; a lower side of the lateral surface of the head being formed with ratchet teeth; a rod having a first end extending from the head and having a rod thread near the head and expanding threads far away from the head;
each expanding thread encircled through an angle smaller than 360 degrees; the screwing direction of the expanding thread being identical to or different from that of the rod thread; an angle A being defined an angle between an upper side of each expanding thread and a line vertical to a surface of the rod; an angle B being defined an angle between an lower side of each expanding thread and a line vertical to a surface of the rod; the angle B being greater than the angle A
and the summation of the angle B and angel A being equal to or greater than 90 degrees;
and a tapered tail extending from a second end of the head; the expanding threads on the rod being near the tapered tail; the tapered tail having two drilling threads;
each drilling thread can be extended to or not extended to the tip end of the tapered tail.
2 The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 shows the structure of the present invention.
Fig. 2 is a cross sectional view viewed from the line 2-2 of Fig. 1.
Fig. 3 is a schematic view showing the angles relations of the upper side and the lower side of the expanding thread.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
In order that those skilled in the art can further understand the present invention, a description will be provided in the following in details.
However, these descriptions and the appended drawings are only used to cause those skilled in the art to understand the objects, features, and characteristics of the present invention, but not to be used to confine the scope and spirit of the present invention defined in the appended claims.
Referring to Fig. 1, the embodiment of the present invention is illustrated. The crack-proof screw of the present invention includes the following elements.
A head 1 has a lateral surface which is formed with an axial annular outer ring at an upper side thereof. An upper annular area of the annular outer ring is a flat ring portion 12 and a lower annular area of the annular outer ring is a
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 shows the structure of the present invention.
Fig. 2 is a cross sectional view viewed from the line 2-2 of Fig. 1.
Fig. 3 is a schematic view showing the angles relations of the upper side and the lower side of the expanding thread.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
In order that those skilled in the art can further understand the present invention, a description will be provided in the following in details.
However, these descriptions and the appended drawings are only used to cause those skilled in the art to understand the objects, features, and characteristics of the present invention, but not to be used to confine the scope and spirit of the present invention defined in the appended claims.
Referring to Fig. 1, the embodiment of the present invention is illustrated. The crack-proof screw of the present invention includes the following elements.
A head 1 has a lateral surface which is formed with an axial annular outer ring at an upper side thereof. An upper annular area of the annular outer ring is a flat ring portion 12 and a lower annular area of the annular outer ring is a
3 ratchet tooth area 13. A lower side of the lateral surface of the head 1 is formed with ratchet teeth 14. However, within the scope of the present invention, the head 1 may have other form which is not used to confine the scope of the present invention.
A rod 10 has a first end extending from the head 1 and has a rod thread 12 near the head 1 and expanding threads 3 far away from the head 1.
Each expanding thread 3 is encircled through an angle smaller than 360 degrees. The screwing direction of the expanding thread 3 is identical to or different from that of the rod thread 12. An angle A is defined an angle between an upper side 3A of each expanding thread 3 and a line vertical to a surface of the rod 10. An angle B is defined an angle between a lower side 3B of each expanding thread 3 and a line vertical to a surface of the rod 10. In that, the angle B
is greater than the angle A and the summation of the angle B and angel A is equal to or greater than 90 degrees.
A tapered tail 11 extends from a second end of the head 1. The expanding threads 3 on the rod 10 are near the tapered tail 11. The tapered tail 11 has two drilling threads 4. Each drilling thread 4 can be extended to or not extended to the tip end 110 of the tapered tail 11.
Thus, by the structure of the present invention, the designs of the rod thread 12, the expanding threads 3 and the drilling threads 4, the screw of the present invention can drill an object quickly with less force and achieve the object of the crack-proof.
A rod 10 has a first end extending from the head 1 and has a rod thread 12 near the head 1 and expanding threads 3 far away from the head 1.
Each expanding thread 3 is encircled through an angle smaller than 360 degrees. The screwing direction of the expanding thread 3 is identical to or different from that of the rod thread 12. An angle A is defined an angle between an upper side 3A of each expanding thread 3 and a line vertical to a surface of the rod 10. An angle B is defined an angle between a lower side 3B of each expanding thread 3 and a line vertical to a surface of the rod 10. In that, the angle B
is greater than the angle A and the summation of the angle B and angel A is equal to or greater than 90 degrees.
A tapered tail 11 extends from a second end of the head 1. The expanding threads 3 on the rod 10 are near the tapered tail 11. The tapered tail 11 has two drilling threads 4. Each drilling thread 4 can be extended to or not extended to the tip end 110 of the tapered tail 11.
Thus, by the structure of the present invention, the designs of the rod thread 12, the expanding threads 3 and the drilling threads 4, the screw of the present invention can drill an object quickly with less force and achieve the object of the crack-proof.
4 The present invention is thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the present invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.
5
Claims (2)
1. A crack-proof screw comprising:
a head;
a rod having a first end extending from the head and having a rod thread near the head and expanding threads far away from the head;
each expanding thread encircled through an angle smaller than 360 degrees; the screwing direction of the expanding thread being identical to or different from that of the rod thread; an angle A being defined an angle between an upper side of each expanding thread and a line vertical to a surface of the rod; an angle B being defined an angle between an lower side of each expanding thread and a line vertical to a surface of the rod; the angle B being greater than the angle A
and the summation of the angle B and angel A being equal to or greater than 90 degrees;
a tapered tail extending from a second end of the head; the expanding threads on the rod being near the tapered tail; the tapered tail having two drilling threads; each drilling thread can be extended to or not extended to the tip end of the tapered tail.
a head;
a rod having a first end extending from the head and having a rod thread near the head and expanding threads far away from the head;
each expanding thread encircled through an angle smaller than 360 degrees; the screwing direction of the expanding thread being identical to or different from that of the rod thread; an angle A being defined an angle between an upper side of each expanding thread and a line vertical to a surface of the rod; an angle B being defined an angle between an lower side of each expanding thread and a line vertical to a surface of the rod; the angle B being greater than the angle A
and the summation of the angle B and angel A being equal to or greater than 90 degrees;
a tapered tail extending from a second end of the head; the expanding threads on the rod being near the tapered tail; the tapered tail having two drilling threads; each drilling thread can be extended to or not extended to the tip end of the tapered tail.
2. A crack-proof screw comprising:
a head having a lateral surface which is formed with an axial annular outer ring at an upper side thereof; an upper annular area of the annular outer ring being a flat ring portion and a lower annular area of the annular outer ring being a ratchet tooth area; a lower side of the lateral surface of the head being formed with ratchet teeth;
a rod having a first end extending from the head and the rod having a rod thread near the head and expanding threads far away from the head;
each expanding thread encircled through an angle smaller than 360 degrees; the screwing direction of the expanding thread being identical to or different from that of the rod thread; an angle A being defined an angle between an upper side of each expanding thread and a line vertical to a surface of the rod; an angle B being defined an angle between an lower side of each expanding thread and a line vertical to a surface of the rod; the angle B being greater than the angle A
and the summation of the angle B and angel A being equal to or greater than 90 degrees; and a tapered tail extending from a second end of the head; the expanding threads on the rod being near the tapered tail; the tapered tail having two drilling threads; each drilling thread can be extended to or not extended to the tip end of the tapered tail.
a head having a lateral surface which is formed with an axial annular outer ring at an upper side thereof; an upper annular area of the annular outer ring being a flat ring portion and a lower annular area of the annular outer ring being a ratchet tooth area; a lower side of the lateral surface of the head being formed with ratchet teeth;
a rod having a first end extending from the head and the rod having a rod thread near the head and expanding threads far away from the head;
each expanding thread encircled through an angle smaller than 360 degrees; the screwing direction of the expanding thread being identical to or different from that of the rod thread; an angle A being defined an angle between an upper side of each expanding thread and a line vertical to a surface of the rod; an angle B being defined an angle between an lower side of each expanding thread and a line vertical to a surface of the rod; the angle B being greater than the angle A
and the summation of the angle B and angel A being equal to or greater than 90 degrees; and a tapered tail extending from a second end of the head; the expanding threads on the rod being near the tapered tail; the tapered tail having two drilling threads; each drilling thread can be extended to or not extended to the tip end of the tapered tail.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2708419A CA2708419C (en) | 2010-06-21 | 2010-06-21 | Crack-proof screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2708419A CA2708419C (en) | 2010-06-21 | 2010-06-21 | Crack-proof screw |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2708419A1 true CA2708419A1 (en) | 2011-12-21 |
| CA2708419C CA2708419C (en) | 2017-05-09 |
Family
ID=45353946
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2708419A Expired - Fee Related CA2708419C (en) | 2010-06-21 | 2010-06-21 | Crack-proof screw |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2708419C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10570943B2 (en) | 2016-11-16 | 2020-02-25 | Illinois Tool Works Inc. | Threaded fastener |
| US11692578B2 (en) | 2018-09-26 | 2023-07-04 | Illinois Tool Works Inc. | Post-to-beam fastener |
-
2010
- 2010-06-21 CA CA2708419A patent/CA2708419C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10570943B2 (en) | 2016-11-16 | 2020-02-25 | Illinois Tool Works Inc. | Threaded fastener |
| US11578747B2 (en) | 2016-11-16 | 2023-02-14 | Illinois Tool Works Inc. | Threaded fastener |
| US11692578B2 (en) | 2018-09-26 | 2023-07-04 | Illinois Tool Works Inc. | Post-to-beam fastener |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2708419C (en) | 2017-05-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request |
Effective date: 20150408 |
|
| MKLA | Lapsed |
Effective date: 20220301 |
|
| MKLA | Lapsed |
Effective date: 20200831 |