CA1135089A - Fastening device - Google Patents
Fastening deviceInfo
- Publication number
- CA1135089A CA1135089A CA000324007A CA324007A CA1135089A CA 1135089 A CA1135089 A CA 1135089A CA 000324007 A CA000324007 A CA 000324007A CA 324007 A CA324007 A CA 324007A CA 1135089 A CA1135089 A CA 1135089A
- Authority
- CA
- Canada
- Prior art keywords
- projections
- fastening device
- engaging surface
- edges
- circle line
- 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
Links
Landscapes
- Connection Of Plates (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
An improved fastening device having toothed engaging surfaces, the fastening device including bolts, nuts, and the like having lower engaging surface projecting with teeth con-structed to afford material resistance to loosening of the fastening device after being brought into pressure engagement with an adjacent surface of a work piece by the tightening of the fastening device.
An improved fastening device having toothed engaging surfaces, the fastening device including bolts, nuts, and the like having lower engaging surface projecting with teeth con-structed to afford material resistance to loosening of the fastening device after being brought into pressure engagement with an adjacent surface of a work piece by the tightening of the fastening device.
Description
1~3S08g The present invention relates to an improvement of a fastening device having toothed engaging surfaces and more particularly to an improvement of a fastening device including bolts, nuts, and the like having lower engaging surface pro-jections with teeth constructed to afford material resistance to loosening of the fastening device after being brought into pressure engagement with an adjacent surface of a work piece by the tightening of the fastening device.
An object of the present invention is to provide an improved fastening device such as nut or bolt head having a toothed engaging surface to effect the requirement of re-lease torque value to loosen the fastening device which ex-tremely exceeds the application torque required for tightening it.
Another object of the present invention is to pro-vide an improved engaging surface of a threaded fastening device having ratchet-like projections in the form of double-edged sword, whereby when the fastening device is turned in a loosening direction an adjacent work piece surface is cut by the projections and engaged with the latter without abrasion or injury of the points of the projections, thereby obtaining ; locking action of the fastening device.
It is another object of the present invention to provide an integrally formed threaded fastening device having engaging surface provided with a number of ratchet-like pro-jections to cause, on an adjacent work piece, two group of engaging sections divided inward and outward so as to provide a good locking action when the fastening device is rotated in a loosening direction.
Still another object of the present invention is to provide an unique construction of the toothed engaging surface of a fastening device providing higher release torque to application torque ratio characteristics than generally known lock nut or bolt having engaging projections.
In one aspect of the present invention there is provided a fastening device comprising: a body having an en-gaging surface and threads concentric with the axis thereof, .
,.
~13S089 a plurality of ratchet-like projections formed on the engaging surface in the form of a sawtooth in cross section; each of said projections having a first side edge and a second side edge with leading point which forms high end of the projections;
said points being lain on an lma~lnat~ve circle line on the engaging surface and being faced to the opposite direction in relation to the direction of tightening of the fastening device; ~-each of said first side edge extending in a direction outward from the circle line; each of said second edge extending in a direction inward from the circle line; said circle line being positioned near an inner edge of the engaging surface, whereby length or cutting area of the first edges is larger than that of the second edges at approximately a four or five to one ratio.
The other objects and advantages of the present in- -vention will become apparent from the following detailed des-cription illustrating the invention by way of example with reference to the accompanying drawings, wherein:
Figure 1 is a side view showing the adaption of an embodiment of this invention to a flanged nut;
Figure 2 is an end view of the flanged nut illustrated in Figure l;
Figure 3 is a fragmentary enlarged end view of the flanged nut:
Figure 4 is a fragmentary sectional view taken along the line 4-4 in Figure 3;
Figure 5 is a fragmentary sectional view taken along the line 5-5 in Figure 3;
Figure 6 is a sectional view of a somewhat modified other embodiment which shows the relative position occupied by the projections and the work piece when the nut is rotated in loosening direction; and Figures 7, 8 and 9 are respectively side view of other embodiments of the present invention wherein Figure 7 is adapted for a standard nut, Figure 8 being adapted for bolt having a flanged head and Figure 9 being adapted for a standard bolt having a head.
Referring to the drawing more in detail wherein I
have employed like characteristics to denote similar parts in the various figures it will be seen that one embodiment of the present invention contemplates a threaded flange nut designated by the numeral 10~
The nut 10 is provided with a body 11 having an annular flange 12 formed at lower portion of the body, a threaded bore 13 extending through the axis of the body and an engaging end surface 14 having a number of ratchet-like projections 15.
Each of said projections has a first side edge 17 and a second side edge 18 defined by a leading point 19 which is formed at high end of the projection. Each of said points is lain on a circle line 16 and being faced to the direction of tightening of the nut 10.
Said first side edges 17 extend in a direction outward from the circle line 16 and the second surface or edge 18 being extended in a direction inward from the circle line. The circle line 16 is positioned near the inner edge 20 of the engaging surface so that length of the first edges 17 are larger than that of the second side edges 18, several times as large, pre-ferably in a five to one ratio.
An angle X formed by the first and second edges 17, 18 is 65 to 90, preferably 72 to form sharp points, and pre-ferably slowly inclined surfaces 22 and suddenly inclined sur-faces 23 of the ratchet-like projection are intersected in sub-stantially right angular relationship as shown in Figure 5.
In operation, it will be understood that the arcuate angle points 19 of the projection on the engaging surface 14 serve as spearheads when the nut is turned in a clockwise direction, that is, loosening direction as shown at numeral 21 in Figure 2, thereby cutting into the surface on an adjacent work piece 24. In this case, the points easily bite into the adjacent work piece by effect of double-edged sword of the projections formed of the leading points 19 with the first and the second edges 17, 18, thereby preventing abrasion of injury of the pointed projections.
Furthermore, the cut material cut by the projections is divided into two directions along the first and the second side edges 17, 18 at shown arrows 25 and 26 in Figure 3. As the cutting area of the first side edges are quintuple as large ~' ~1 .: . ' ` :
.
.
113S~)89 as that of the second side edges, a large quantity of cut material is generated in the first side edges 17, and it serves as material resistance. In general, the co-efficient of friction of outer portion on the engaging surface 14 is larger than that of inner portion on the engaging surface, so that the afore-mentioned large material resistance generated by the first edges 17 serves as a large amount of locking resistance and is effectively acted to prevent loosening of the nut.
In addition, each of said projections is compressed between the both sides 17, 18 by said outer cut material and inner cut material so as to cause a wedge effect of the pro-jections, thereby increasing locking action of the nut. If, as shown in Figure 6, the inner edge 20 of the engaging surface 14 is arranged near the threaded bore 13A, said inner cut mat-erial 27 generated by the second edge 18 is compressed between the projections and threads 28 of a bolt 29 and provides large resistance to rotate loosening direction, thereby obtaining high locking action of the fastening device.
Referring to the Figure 7, the present invention is applied to a standard nut lOA in which projections 14A having same construction of the projections 14 in the first embodiment is provided to give the same locking action as in the case of the first embodiment.
Figures 8 and 9 also illustrate other embodiments of the present invention in which projections 14B similar to the aforementioned projections in the first embodiment are formed on the lower surface of a flange head 30 of a bolt 31 in Figure 8, and projections 14C similar to the projections 14 being adapted to a standard headed bolt 32 in Figure 9. It will be understood that the bolts illustrated in Figures 8 and 9 also may be applied the same locking action as in the case of the aforementioned first embodiment.
Changes and modifications will occur to those skilled in the art, and the foregoing is not intended to limit the scope of the present invention, which is defined by the following claims.
An object of the present invention is to provide an improved fastening device such as nut or bolt head having a toothed engaging surface to effect the requirement of re-lease torque value to loosen the fastening device which ex-tremely exceeds the application torque required for tightening it.
Another object of the present invention is to pro-vide an improved engaging surface of a threaded fastening device having ratchet-like projections in the form of double-edged sword, whereby when the fastening device is turned in a loosening direction an adjacent work piece surface is cut by the projections and engaged with the latter without abrasion or injury of the points of the projections, thereby obtaining ; locking action of the fastening device.
It is another object of the present invention to provide an integrally formed threaded fastening device having engaging surface provided with a number of ratchet-like pro-jections to cause, on an adjacent work piece, two group of engaging sections divided inward and outward so as to provide a good locking action when the fastening device is rotated in a loosening direction.
Still another object of the present invention is to provide an unique construction of the toothed engaging surface of a fastening device providing higher release torque to application torque ratio characteristics than generally known lock nut or bolt having engaging projections.
In one aspect of the present invention there is provided a fastening device comprising: a body having an en-gaging surface and threads concentric with the axis thereof, .
,.
~13S089 a plurality of ratchet-like projections formed on the engaging surface in the form of a sawtooth in cross section; each of said projections having a first side edge and a second side edge with leading point which forms high end of the projections;
said points being lain on an lma~lnat~ve circle line on the engaging surface and being faced to the opposite direction in relation to the direction of tightening of the fastening device; ~-each of said first side edge extending in a direction outward from the circle line; each of said second edge extending in a direction inward from the circle line; said circle line being positioned near an inner edge of the engaging surface, whereby length or cutting area of the first edges is larger than that of the second edges at approximately a four or five to one ratio.
The other objects and advantages of the present in- -vention will become apparent from the following detailed des-cription illustrating the invention by way of example with reference to the accompanying drawings, wherein:
Figure 1 is a side view showing the adaption of an embodiment of this invention to a flanged nut;
Figure 2 is an end view of the flanged nut illustrated in Figure l;
Figure 3 is a fragmentary enlarged end view of the flanged nut:
Figure 4 is a fragmentary sectional view taken along the line 4-4 in Figure 3;
Figure 5 is a fragmentary sectional view taken along the line 5-5 in Figure 3;
Figure 6 is a sectional view of a somewhat modified other embodiment which shows the relative position occupied by the projections and the work piece when the nut is rotated in loosening direction; and Figures 7, 8 and 9 are respectively side view of other embodiments of the present invention wherein Figure 7 is adapted for a standard nut, Figure 8 being adapted for bolt having a flanged head and Figure 9 being adapted for a standard bolt having a head.
Referring to the drawing more in detail wherein I
have employed like characteristics to denote similar parts in the various figures it will be seen that one embodiment of the present invention contemplates a threaded flange nut designated by the numeral 10~
The nut 10 is provided with a body 11 having an annular flange 12 formed at lower portion of the body, a threaded bore 13 extending through the axis of the body and an engaging end surface 14 having a number of ratchet-like projections 15.
Each of said projections has a first side edge 17 and a second side edge 18 defined by a leading point 19 which is formed at high end of the projection. Each of said points is lain on a circle line 16 and being faced to the direction of tightening of the nut 10.
Said first side edges 17 extend in a direction outward from the circle line 16 and the second surface or edge 18 being extended in a direction inward from the circle line. The circle line 16 is positioned near the inner edge 20 of the engaging surface so that length of the first edges 17 are larger than that of the second side edges 18, several times as large, pre-ferably in a five to one ratio.
An angle X formed by the first and second edges 17, 18 is 65 to 90, preferably 72 to form sharp points, and pre-ferably slowly inclined surfaces 22 and suddenly inclined sur-faces 23 of the ratchet-like projection are intersected in sub-stantially right angular relationship as shown in Figure 5.
In operation, it will be understood that the arcuate angle points 19 of the projection on the engaging surface 14 serve as spearheads when the nut is turned in a clockwise direction, that is, loosening direction as shown at numeral 21 in Figure 2, thereby cutting into the surface on an adjacent work piece 24. In this case, the points easily bite into the adjacent work piece by effect of double-edged sword of the projections formed of the leading points 19 with the first and the second edges 17, 18, thereby preventing abrasion of injury of the pointed projections.
Furthermore, the cut material cut by the projections is divided into two directions along the first and the second side edges 17, 18 at shown arrows 25 and 26 in Figure 3. As the cutting area of the first side edges are quintuple as large ~' ~1 .: . ' ` :
.
.
113S~)89 as that of the second side edges, a large quantity of cut material is generated in the first side edges 17, and it serves as material resistance. In general, the co-efficient of friction of outer portion on the engaging surface 14 is larger than that of inner portion on the engaging surface, so that the afore-mentioned large material resistance generated by the first edges 17 serves as a large amount of locking resistance and is effectively acted to prevent loosening of the nut.
In addition, each of said projections is compressed between the both sides 17, 18 by said outer cut material and inner cut material so as to cause a wedge effect of the pro-jections, thereby increasing locking action of the nut. If, as shown in Figure 6, the inner edge 20 of the engaging surface 14 is arranged near the threaded bore 13A, said inner cut mat-erial 27 generated by the second edge 18 is compressed between the projections and threads 28 of a bolt 29 and provides large resistance to rotate loosening direction, thereby obtaining high locking action of the fastening device.
Referring to the Figure 7, the present invention is applied to a standard nut lOA in which projections 14A having same construction of the projections 14 in the first embodiment is provided to give the same locking action as in the case of the first embodiment.
Figures 8 and 9 also illustrate other embodiments of the present invention in which projections 14B similar to the aforementioned projections in the first embodiment are formed on the lower surface of a flange head 30 of a bolt 31 in Figure 8, and projections 14C similar to the projections 14 being adapted to a standard headed bolt 32 in Figure 9. It will be understood that the bolts illustrated in Figures 8 and 9 also may be applied the same locking action as in the case of the aforementioned first embodiment.
Changes and modifications will occur to those skilled in the art, and the foregoing is not intended to limit the scope of the present invention, which is defined by the following claims.
Claims (6)
1. A fastening device comprising:
a body having an engaging surface and threads con-centric with the axis thereof;
a plurality of ratchet-like projections formed on the engaging surface in the form of a sawtooth in cross section each of said projections having a first side edge and a second side edge with leading point which forms high end of the projections;
said points being lain on an imaginary circle line on the engaging surface and being faced to the opposite direction in relation to the direction of tightening of the fastening device;
each of said first side edge extending in a direction outward from the circle line;
each of said second edge extending in a direction in-ward from the circle line;
said circle line being positioned near an inner edge of the engaging surface, whereby length or cutting area of the first edges is larger than that of the second edges at approx-imately a four or five to one ratio.
a body having an engaging surface and threads con-centric with the axis thereof;
a plurality of ratchet-like projections formed on the engaging surface in the form of a sawtooth in cross section each of said projections having a first side edge and a second side edge with leading point which forms high end of the projections;
said points being lain on an imaginary circle line on the engaging surface and being faced to the opposite direction in relation to the direction of tightening of the fastening device;
each of said first side edge extending in a direction outward from the circle line;
each of said second edge extending in a direction in-ward from the circle line;
said circle line being positioned near an inner edge of the engaging surface, whereby length or cutting area of the first edges is larger than that of the second edges at approx-imately a four or five to one ratio.
2. A fastening device as claimed in claim 1 wherein each of said first edges and said second edges of the projections being intersected at an angle of approximately 70°, and each angle of the ratchet-like projections in cross section being substantially a right angle, whereby said points are relatively sharp.
3. A fastening device as claimed in claim 1 or 2 wherein the engaging surface having the projections is formed on the bottom surface of a flange nut.
4. A fastening device as claimed in claim 1 or 2 wherein the engaging surface having the projections is provided on the bottom surface of a standard nut.
5. A fastening device as claimed in claim 1 or 2 wherein the engaging surface having the projections is formed on the bottom surface of a flange head of a flange head bolt.
6. A fastening device as claimed in claim 1 or 2 wherein the engaging surface having the projections is formed on the bottom surface of a head of a standard headed bolt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000324007A CA1135089A (en) | 1979-03-22 | 1979-03-22 | Fastening device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000324007A CA1135089A (en) | 1979-03-22 | 1979-03-22 | Fastening device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1135089A true CA1135089A (en) | 1982-11-09 |
Family
ID=4113807
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000324007A Expired CA1135089A (en) | 1979-03-22 | 1979-03-22 | Fastening device |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1135089A (en) |
-
1979
- 1979-03-22 CA CA000324007A patent/CA1135089A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |