CA2310551C - Improved fastener for anti-loose - Google Patents
Improved fastener for anti-loose Download PDFInfo
- Publication number
- CA2310551C CA2310551C CA 2310551 CA2310551A CA2310551C CA 2310551 C CA2310551 C CA 2310551C CA 2310551 CA2310551 CA 2310551 CA 2310551 A CA2310551 A CA 2310551A CA 2310551 C CA2310551 C CA 2310551C
- Authority
- CA
- Canada
- Prior art keywords
- head
- tapered angle
- underside
- fastener
- incisions
- 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.)
- Expired - Fee Related
Links
- 239000002184 metal Substances 0.000 claims abstract description 16
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material 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
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
- F16B35/04—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
- F16B35/06—Specially-shaped heads
- F16B35/065—Specially-shaped heads with self-countersink-cutting means
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Connection Of Plates (AREA)
Abstract
The present invention is disclose a metal screw for attaching two thin panels together, such as an anti-loose fastener for joining metal panels. It comprises plurality of relatively small integral tapered angle blocks on underside of the head of the fastener spaced from one another by substantially planar uninterrupted portions of said head and projecting axially therefrom for engaging workpiece. And, the tapered angle block can generate counter stresses which can absorb any ways of torque; namely, be suitable for working in direction instability high frequency vibration environment, and won't loose.
Description
~
IMPROVED FASTENER FOR ANTI-LOOSE
BACKGROIJD OF THE INVENTION
w 1. Field of the Invention This invention relates generally to an anti-loose fastener for joining metal panels. Specifically, the invention is directed to a sheet metal screw for attaching two thin panels together, which screw exhibits an increased stripping torque over those of the prior art.
IMPROVED FASTENER FOR ANTI-LOOSE
BACKGROIJD OF THE INVENTION
w 1. Field of the Invention This invention relates generally to an anti-loose fastener for joining metal panels. Specifically, the invention is directed to a sheet metal screw for attaching two thin panels together, which screw exhibits an increased stripping torque over those of the prior art.
2. Description of the Prior Art With presently available sheet metal screw, the range between drive torque and strip torque is unacceptably small. For this reason, it is virtually impossible, given dimensional tolerances and variances in material, to find a single torque setting on power screwdrivers, which will drive the hardest-to-drive screw without stripping the most strippable screw. Such a situation results in a relatively high number of screws being stripped during installation, leading to reduce clamp load between two metal panels being joined or secured together, or requires substantial operator time for removal and replacement of stripped screws. On another situation, a type of screw probably has a solution to this problem by increasing the range between drive torque and strip torque, making it more difficult to strip the screw with the torque required to drive it into the panels being joined together.
One such attempt is disclosed in U.S. Pat. No. 5,183,359, issued to Barth on February 2,1993. Barth discloses a head 20a and a threaded shank 1 Oa, and the head 20a has a clamping face 210a which includes a number of polyhedral nibs 23a extending axially therefrom and separated from one another by substantially planar uninterrupted portions of the clamping face 210a. The nibs 23a include a leading wall 233a and a trailing wall 235a, facing in the direction of tightening and opposite thereto, respectively. The leading wall i 233a may be inclined at a steeper angle with respect to the plane of the clamping face 210a than is the trailing wall 235a, or vice versa. The leading wall 233a and trailing wall 235a meet to form an apex 231a which is also inclined with respect to the plane of the clamping face 210a, so that the nibs 23a increase in axial height as one views outward toward the periphery of the clamping face 210a. And the trailing wall 235a angle may be greater than the leading wall angle 231 a may still inhibit further tightening of the fastener member, while the trailing wall 235a may resist backout due to vibration, as shown in FIG. lA and 1B.
Unfortunately, the direction of vibration cannot be expected; particularly, the trailing walls 235a of the nibs 23a are designated for absorbing one-way vibration torque only Therefore, this type of fastener cannot be set in nondirective high frequency vibration environment.
However, the present invention can solve this problem; namely, not only overcome the one-way torque due to vibration, but also any ways It is a major object of the invention to provide plurality of relatively small integral tapered angle block on the underside of head spaced from one another by substantially planar uninterrupted portions of head and projecting axially therefrom for engaging workpiece.
Another object of the invention is to overcome the directional instability high frequency vibration environment by using the tapered angle block to absorb any ways of torque.
The present invention is directed to a sheet metal screw for attaching two thin panels together, such as an anti-loose fastener for joining metal panels.
It comprises a head having an uppers side and underside; a shank having threads throughout the entire length thereof, said shank attached to said underside of said head; and plurality of relatively small integral tapered angle blocks on said underside of head spaced from one another by substantially planar uninterrupted portions of said head and projecting axially therefrom for engaging workpiece.
Furthermore, each tapered angle block has an incision therefrom, which defines a angle from the periphery of said tapered angle block cutting to the vertex, and set on whose clockwise direction by substantially planar uninterrupted portions of said head and projecting axially therefrom.
In one embodiment the invention provides an anti-loosening fastener for joining metal panels, comprising: a head having an upper side and an underside; a shank extending from said underside of said head and having threads formed throughout an entire length thereof; and a plurality of relatively small tapered angle blocks integrally formed on said underside of said head spaced from one another by substantially planar uninterrupted portions of said head, said tapered angle blocks projecting axially from said underside of said head for engaging a workpiece, each said tapered angle block having an incision defining a pair of side walls disposed in angular relationship one with respect to the other, said side walls being joined at a vertex of said angle block.
More preferably the anti-loosening fastener for joining metal panels is defined wherein said incisions of tapered angle blocks each have an orientation that is angularly offset with respect to an adjacent tapered angle block, said angular offset of said incisions being in a clockwise direction.
More preferably the anti-loosening fastener for joining metal panels is defined wherein said incisions of tapered angle blocks each have an orientation that is angularly offset with respect to an adjacent tapered angle block, said angular offset of said incisions being in a counter clockwise direction.
More preferably the anti-loosening fastener for joining metal panels is defined wherein said pair of side walls are angularly disposed at an angle approximating 110 degrees.
These and other objects and advantages of the invention, as well as the details of an illustrative embodiment, will be more fully understood from the following description and drawings, in which:
DRAWING DESCRIPTION
FIG.1 A is a side perspective view of the prior art.
FIG.1B is a perspective view of the underside of the prior art FIG.2 is a side perspective view of the improved fastener for anti-loose of the present invention.
FIG.3 is a perspective view of the improved fastener for anti-loose of the present invention.
FIG.4 is a pictorial drawing of the tapered angle block according to a preferred embodiment of the present invention.
FIGS is a pictorial drawing of the tapered angle block according to another preferred embodiment of the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
With reference now to figure, FIG.2 and FIG.3 are a side perspective view and a perspective view of the improved fastener for anti-loose of the present invention. The fastener includes a head 20 having an upper side and underside;
a shank 10 having thread 13 throughout the entire length thereof, the shank 3a attached to underside of head 20; and plurality of relatively small integral tapered angle blocks 23 on underside of head space from one another by substantially planar uninterrupted portions of head 10 and projecting axially therefrom for engaging workpiece. Generally, the shank has a first shaft 5 section 11 and integral with a second substantially tapered section 15.
Each tapered angle block 23 defines a vertex 231 and two side wall 2301 and 2303, and has an incision 230 therefrom, which defines an angle a from the periphery of said tapered angle block cutting to said vertex 231 and two side wall 2301 and 2303, Classically, the angle a is 110 degree, as shown in 10 FIG.4. Furthermore, the iacision 230 of tapered angle block 23 is set on whose clockwise direction by substantially planar uninterrupted portions of head 20 and projecting axially therefrom. And, the side wall 2301 of the tapered angle block 23 is set in a direction tangent to the shank 10 extending axially from the underside of the head 20.
Thus, as long as being tightened, the vertexes 231 of the tapered angle blocks 23 projecting axially from underside of the head 20 engage a workpiece. In the meanwhile, the side wall 2301 and 2303 of the incision 230 generate two counter stress F~ and F2 which can absorb any ways of torque;
namely, be suitable for working in direction instability high frequency vibration environment, and won't loose Referring now to FIGS, is a pictorial drawing of the tapered angle block according to another preferred embodiment of the present invention. The incision 232 of tapered angle block 23 is set on whose counter clockwise direction by substantially planar uninterrupted portions of head 20 and projecting axially therefrom. That is different function from the above-mentioned incision 230. One is for anti-loose; the other one is for anti-fastened.
One such attempt is disclosed in U.S. Pat. No. 5,183,359, issued to Barth on February 2,1993. Barth discloses a head 20a and a threaded shank 1 Oa, and the head 20a has a clamping face 210a which includes a number of polyhedral nibs 23a extending axially therefrom and separated from one another by substantially planar uninterrupted portions of the clamping face 210a. The nibs 23a include a leading wall 233a and a trailing wall 235a, facing in the direction of tightening and opposite thereto, respectively. The leading wall i 233a may be inclined at a steeper angle with respect to the plane of the clamping face 210a than is the trailing wall 235a, or vice versa. The leading wall 233a and trailing wall 235a meet to form an apex 231a which is also inclined with respect to the plane of the clamping face 210a, so that the nibs 23a increase in axial height as one views outward toward the periphery of the clamping face 210a. And the trailing wall 235a angle may be greater than the leading wall angle 231 a may still inhibit further tightening of the fastener member, while the trailing wall 235a may resist backout due to vibration, as shown in FIG. lA and 1B.
Unfortunately, the direction of vibration cannot be expected; particularly, the trailing walls 235a of the nibs 23a are designated for absorbing one-way vibration torque only Therefore, this type of fastener cannot be set in nondirective high frequency vibration environment.
However, the present invention can solve this problem; namely, not only overcome the one-way torque due to vibration, but also any ways It is a major object of the invention to provide plurality of relatively small integral tapered angle block on the underside of head spaced from one another by substantially planar uninterrupted portions of head and projecting axially therefrom for engaging workpiece.
Another object of the invention is to overcome the directional instability high frequency vibration environment by using the tapered angle block to absorb any ways of torque.
The present invention is directed to a sheet metal screw for attaching two thin panels together, such as an anti-loose fastener for joining metal panels.
It comprises a head having an uppers side and underside; a shank having threads throughout the entire length thereof, said shank attached to said underside of said head; and plurality of relatively small integral tapered angle blocks on said underside of head spaced from one another by substantially planar uninterrupted portions of said head and projecting axially therefrom for engaging workpiece.
Furthermore, each tapered angle block has an incision therefrom, which defines a angle from the periphery of said tapered angle block cutting to the vertex, and set on whose clockwise direction by substantially planar uninterrupted portions of said head and projecting axially therefrom.
In one embodiment the invention provides an anti-loosening fastener for joining metal panels, comprising: a head having an upper side and an underside; a shank extending from said underside of said head and having threads formed throughout an entire length thereof; and a plurality of relatively small tapered angle blocks integrally formed on said underside of said head spaced from one another by substantially planar uninterrupted portions of said head, said tapered angle blocks projecting axially from said underside of said head for engaging a workpiece, each said tapered angle block having an incision defining a pair of side walls disposed in angular relationship one with respect to the other, said side walls being joined at a vertex of said angle block.
More preferably the anti-loosening fastener for joining metal panels is defined wherein said incisions of tapered angle blocks each have an orientation that is angularly offset with respect to an adjacent tapered angle block, said angular offset of said incisions being in a clockwise direction.
More preferably the anti-loosening fastener for joining metal panels is defined wherein said incisions of tapered angle blocks each have an orientation that is angularly offset with respect to an adjacent tapered angle block, said angular offset of said incisions being in a counter clockwise direction.
More preferably the anti-loosening fastener for joining metal panels is defined wherein said pair of side walls are angularly disposed at an angle approximating 110 degrees.
These and other objects and advantages of the invention, as well as the details of an illustrative embodiment, will be more fully understood from the following description and drawings, in which:
DRAWING DESCRIPTION
FIG.1 A is a side perspective view of the prior art.
FIG.1B is a perspective view of the underside of the prior art FIG.2 is a side perspective view of the improved fastener for anti-loose of the present invention.
FIG.3 is a perspective view of the improved fastener for anti-loose of the present invention.
FIG.4 is a pictorial drawing of the tapered angle block according to a preferred embodiment of the present invention.
FIGS is a pictorial drawing of the tapered angle block according to another preferred embodiment of the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
With reference now to figure, FIG.2 and FIG.3 are a side perspective view and a perspective view of the improved fastener for anti-loose of the present invention. The fastener includes a head 20 having an upper side and underside;
a shank 10 having thread 13 throughout the entire length thereof, the shank 3a attached to underside of head 20; and plurality of relatively small integral tapered angle blocks 23 on underside of head space from one another by substantially planar uninterrupted portions of head 10 and projecting axially therefrom for engaging workpiece. Generally, the shank has a first shaft 5 section 11 and integral with a second substantially tapered section 15.
Each tapered angle block 23 defines a vertex 231 and two side wall 2301 and 2303, and has an incision 230 therefrom, which defines an angle a from the periphery of said tapered angle block cutting to said vertex 231 and two side wall 2301 and 2303, Classically, the angle a is 110 degree, as shown in 10 FIG.4. Furthermore, the iacision 230 of tapered angle block 23 is set on whose clockwise direction by substantially planar uninterrupted portions of head 20 and projecting axially therefrom. And, the side wall 2301 of the tapered angle block 23 is set in a direction tangent to the shank 10 extending axially from the underside of the head 20.
Thus, as long as being tightened, the vertexes 231 of the tapered angle blocks 23 projecting axially from underside of the head 20 engage a workpiece. In the meanwhile, the side wall 2301 and 2303 of the incision 230 generate two counter stress F~ and F2 which can absorb any ways of torque;
namely, be suitable for working in direction instability high frequency vibration environment, and won't loose Referring now to FIGS, is a pictorial drawing of the tapered angle block according to another preferred embodiment of the present invention. The incision 232 of tapered angle block 23 is set on whose counter clockwise direction by substantially planar uninterrupted portions of head 20 and projecting axially therefrom. That is different function from the above-mentioned incision 230. One is for anti-loose; the other one is for anti-fastened.
Claims (4)
1. An anti-loosening fastener for joining metal panels, comprising:
a head having an upper side and an underside;
a shank extending from said underside of said head and having threads formed throughout an entire length thereof; and a plurality of relatively small tapered angle blocks integrally formed on said underside of said head spaced from one another by substantially planar uninterrupted portions of said head, said tapered angle blocks projecting axially from said underside of said head for engaging a workpiece, each said tapered angle block having an incision defining a pair of side walls disposed in angular relationship one with respect to the other, said side walls being joined at a vertex of said angle block.
a head having an upper side and an underside;
a shank extending from said underside of said head and having threads formed throughout an entire length thereof; and a plurality of relatively small tapered angle blocks integrally formed on said underside of said head spaced from one another by substantially planar uninterrupted portions of said head, said tapered angle blocks projecting axially from said underside of said head for engaging a workpiece, each said tapered angle block having an incision defining a pair of side walls disposed in angular relationship one with respect to the other, said side walls being joined at a vertex of said angle block.
2. The anti-loosening fastener for joining metal panels as claimed in claim 1, wherein said incisions of tapered angle blocks each have an orientation that is angularly offset with respect to an adjacent tapered angle block, said angular offset of said incisions being in a clockwise direction.
3. The anti-loosening fastener for joining metal panels as claimed in claim 1, wherein said incisions of tapered angle blocks each have an orientation that is angularly offset with respect to an adjacent tapered angle block, said angular offset of said incisions being in a counter clockwise direction.
4. The anti-loosening fastener for joining metal panels as claimed in claim 1, wherein said pair of side walls are angularly disposed at an angle approximating 110 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2310551 CA2310551C (en) | 2000-06-02 | 2000-06-02 | Improved fastener for anti-loose |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2310551 CA2310551C (en) | 2000-06-02 | 2000-06-02 | Improved fastener for anti-loose |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2310551A1 CA2310551A1 (en) | 2001-12-02 |
| CA2310551C true CA2310551C (en) | 2004-09-14 |
Family
ID=4166374
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2310551 Expired - Fee Related CA2310551C (en) | 2000-06-02 | 2000-06-02 | Improved fastener for anti-loose |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2310551C (en) |
-
2000
- 2000-06-02 CA CA 2310551 patent/CA2310551C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2310551A1 (en) | 2001-12-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |