CA2053012C - Fixing means - Google Patents
Fixing meansInfo
- Publication number
- CA2053012C CA2053012C CA002053012A CA2053012A CA2053012C CA 2053012 C CA2053012 C CA 2053012C CA 002053012 A CA002053012 A CA 002053012A CA 2053012 A CA2053012 A CA 2053012A CA 2053012 C CA2053012 C CA 2053012C
- Authority
- CA
- Canada
- Prior art keywords
- section
- screw
- screw thread
- screw pitch
- pitch
- 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
- 239000011295 pitch Substances 0.000 claims abstract description 80
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
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/02—Locking of screws, bolts or nuts in which the locking takes place after screwing down
- F16B39/12—Locking of screws, bolts or nuts in which the locking takes place after screwing down by means of locknuts
- F16B39/16—Locking of screws, bolts or nuts in which the locking takes place after screwing down by means of locknuts in which the screw-thread of the locknut differs from that of the nut
- F16B39/18—Locking of screws, bolts or nuts in which the locking takes place after screwing down by means of locknuts in which the screw-thread of the locknut differs from that of the nut in which the locknut grips with screw-thread in the nuts as well as on the bolt
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Connection Of Plates (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
- Bolts, Nuts, And Washers (AREA)
Abstract
The nut includes a first half having a short shank with an internal screw thread therethrough and an external screw thread on the short shank and a second half with a threaded bore.
The internal thread has a first pitch and the external thread has a second screw pitch, the second and third screw pitches having different vertical lengths. The threaded bore includes a first section and a second section wider than the first section and the length of the short shank. The first section has a screw pitch equal to the first screw pitch and the second section has a third screw pitch slightly finer than that of the second screw pitch.
The internal thread has a first pitch and the external thread has a second screw pitch, the second and third screw pitches having different vertical lengths. The threaded bore includes a first section and a second section wider than the first section and the length of the short shank. The first section has a screw pitch equal to the first screw pitch and the second section has a third screw pitch slightly finer than that of the second screw pitch.
Description
FIXING MEANS
- . ~ . . ~ . .
- .20~3.Q12 - ~.. . -.
1. FIELD OF THE INVENTION
This invention relates to a nut and bolt set, more particularly to a nut and bolt set which locks more tightly and securely than prior art sets.
- . ~ . . ~ . .
- .20~3.Q12 - ~.. . -.
1. FIELD OF THE INVENTION
This invention relates to a nut and bolt set, more particularly to a nut and bolt set which locks more tightly and securely than prior art sets.
2. DESCRIPTION OF THE RELATED ART
Nuts and bolts are well known in the art. They are widely used as a fastening means for fastening two objects together. There are already nut and bolt sets, such as disclosed in British Patent Nos; 15,391 and 553,936 and in French Patent No. 430,249, each set of which includes a nut having two parts, the combination of said two parts together with the threaded bolt providing a locking mechanism which is difficult to remove or disassemble by easy handling.
SUMMARY OF THE INVENTION
The main object of the present invention is to provide an improved lock nut of said type which lock nut can fasten objects together more firmly and permanently than prior art.
Another object of the present invention is to provide an improved lock nut of the type in which, the .
lock nut includes two parts which provide a deformation of the threads between the two parts and which synchronously provide a firm and difficult locking mechanism which is difficult to remove or disassemble.
According to the present invention, the lock nut includes a first half and a second half, said first half having a short shank with an internal screw thread therethrough and an external screw thread on the short shank, said internal screw thread of the first half having a first screw pitch and being engageable with the threaded bolt of the present invention and the external screw thread having a second screw pitch different from the first screw pitch. The second half includes a threaded bore with two sections of differing radii, a f~rst section and a second section wider than the first section. The first section has a screw pitch equal to the first screw pitch. The second section has a screw pitch which is slightly finer than the second screw pitch and a length which is slightly longer than the length of the short shank of the first half. The difference in screw pitches between the second section of the second half and the external screw thread of the short shank of the first half provide a deformation of screw pitches when the two parts are locked together leading to a locking mechanism which firmer and more secure than the prior sets.
BRIEF DESCRIPTION OF THE DRAWINGS
~, __3__ Other features and advantages of the present invention.will become apparent in the following detailed description, including drawings, all of which show a non-limiting form of the present invention, and in which:
Figure 1 shows a lock nut of the present invention in application; and Figure 2 shows two parts of the lock nut of the present invention, illustrating each part being provided with a screw thread of differing pitch.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
As illustrated in Figures 1 and 2, a bolt of the present invention includes.a threaded shaft (b) having a first screw pitch which passes through two objects (51,52) and is fastened by the nut member of the present invention.
The nut member includes two parts, a first half (1) and a second half (2). The first half (1) has a short shank (13) with an internal screw thread (11) therethrough and an external screw thread (12) on the short shank (13). The internal screw thread (11) has a pitch equal to the first screw pitch of the threaded shaft (b) so that it is engageable with the threaded shaft (b) and the external screw thread has a second screw pitch different from the first screw pitch.
The second half (2) includes a threaded bore with two sections of differing radii, a first section and a second section larger than the first section. A first radius defines the first section which has a screw pitch equal to the first screw pitch of the threaded shaft (b) and a second radius defines the second section which has a third screw pitch. It is important to note here that one of either of the pitches in the third screw pitch or the second screw pitch on the short shank of the first half is finer than the other.
As can be seen in the illustration the second screw pitch has a vertical length "x" and the third screw pitch has a vertical length "y," where "y" is less than "x." The second section of the second half has a horizontal length (Ll) slightly longer than the horizontal length (L2) of the short shank of the first half.
When in application, the second half (2) is threaded on the first half (1) as in the illustration and the whole assembly is unitedly threaded on the shaft (b) which passes through two pieces of objects up to a certain tightness. Since the length Ll is greater than the length L2, there is no clearance remaining between the two halves (1,2) as indicated at (c). In order to make a firmer locking, the second half is turned further as the whole nut is turned in a clockwise direction relative to the first half.
Whereupon, a deformation of screw pitches occurs between the screw pitch of the internal screw thread of the second half and the external screw pitch on the short shank of the first half. The more the second half (2) is tightened, the more severe the deformation becomes, which provides firm engagement between the two S halves. This is the most distinguishing feature of the present invention which is different from the prior art set.
Nuts and bolts are well known in the art. They are widely used as a fastening means for fastening two objects together. There are already nut and bolt sets, such as disclosed in British Patent Nos; 15,391 and 553,936 and in French Patent No. 430,249, each set of which includes a nut having two parts, the combination of said two parts together with the threaded bolt providing a locking mechanism which is difficult to remove or disassemble by easy handling.
SUMMARY OF THE INVENTION
The main object of the present invention is to provide an improved lock nut of said type which lock nut can fasten objects together more firmly and permanently than prior art.
Another object of the present invention is to provide an improved lock nut of the type in which, the .
lock nut includes two parts which provide a deformation of the threads between the two parts and which synchronously provide a firm and difficult locking mechanism which is difficult to remove or disassemble.
According to the present invention, the lock nut includes a first half and a second half, said first half having a short shank with an internal screw thread therethrough and an external screw thread on the short shank, said internal screw thread of the first half having a first screw pitch and being engageable with the threaded bolt of the present invention and the external screw thread having a second screw pitch different from the first screw pitch. The second half includes a threaded bore with two sections of differing radii, a f~rst section and a second section wider than the first section. The first section has a screw pitch equal to the first screw pitch. The second section has a screw pitch which is slightly finer than the second screw pitch and a length which is slightly longer than the length of the short shank of the first half. The difference in screw pitches between the second section of the second half and the external screw thread of the short shank of the first half provide a deformation of screw pitches when the two parts are locked together leading to a locking mechanism which firmer and more secure than the prior sets.
BRIEF DESCRIPTION OF THE DRAWINGS
~, __3__ Other features and advantages of the present invention.will become apparent in the following detailed description, including drawings, all of which show a non-limiting form of the present invention, and in which:
Figure 1 shows a lock nut of the present invention in application; and Figure 2 shows two parts of the lock nut of the present invention, illustrating each part being provided with a screw thread of differing pitch.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
As illustrated in Figures 1 and 2, a bolt of the present invention includes.a threaded shaft (b) having a first screw pitch which passes through two objects (51,52) and is fastened by the nut member of the present invention.
The nut member includes two parts, a first half (1) and a second half (2). The first half (1) has a short shank (13) with an internal screw thread (11) therethrough and an external screw thread (12) on the short shank (13). The internal screw thread (11) has a pitch equal to the first screw pitch of the threaded shaft (b) so that it is engageable with the threaded shaft (b) and the external screw thread has a second screw pitch different from the first screw pitch.
The second half (2) includes a threaded bore with two sections of differing radii, a first section and a second section larger than the first section. A first radius defines the first section which has a screw pitch equal to the first screw pitch of the threaded shaft (b) and a second radius defines the second section which has a third screw pitch. It is important to note here that one of either of the pitches in the third screw pitch or the second screw pitch on the short shank of the first half is finer than the other.
As can be seen in the illustration the second screw pitch has a vertical length "x" and the third screw pitch has a vertical length "y," where "y" is less than "x." The second section of the second half has a horizontal length (Ll) slightly longer than the horizontal length (L2) of the short shank of the first half.
When in application, the second half (2) is threaded on the first half (1) as in the illustration and the whole assembly is unitedly threaded on the shaft (b) which passes through two pieces of objects up to a certain tightness. Since the length Ll is greater than the length L2, there is no clearance remaining between the two halves (1,2) as indicated at (c). In order to make a firmer locking, the second half is turned further as the whole nut is turned in a clockwise direction relative to the first half.
Whereupon, a deformation of screw pitches occurs between the screw pitch of the internal screw thread of the second half and the external screw pitch on the short shank of the first half. The more the second half (2) is tightened, the more severe the deformation becomes, which provides firm engagement between the two S halves. This is the most distinguishing feature of the present invention which is different from the prior art set.
Claims (15)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A fixing means comprising a bolt having a threaded end threaded at a first screw pitch and a nut member detachably engaged with said threaded end;
wherein the improvement is characterized by said nut member including a first half and a second half, said first half having a short shank with an internal screw thread therein and an external screw thread on said short shank, said internal screw thread of said first half having said first screw pitch and being engageable with said threaded end of said bolt, said external screw thread having a second screw pitch different from said first screw pitch;
said second half having a threaded bore with two sections of differing radii, a first section and a second section wider than said first section, said first section of said second half having said first screw pitch and being engageable with said threaded end of said bolt, said second wider section of said second half having an internal screw thread having a third screw pitch and being engageable with said external screw thread of said first half, one of said second and third screw pitches being slightly finer than the other, wherein said second and third screw pitches have different vertical lengths for lockingly deforming at least one of said external screw threads of said first half and said internal screw thread of said second section of said second half on engagement thereof, and said second wider section having a length slightly longer than a length of said short shank of said first half.
wherein the improvement is characterized by said nut member including a first half and a second half, said first half having a short shank with an internal screw thread therein and an external screw thread on said short shank, said internal screw thread of said first half having said first screw pitch and being engageable with said threaded end of said bolt, said external screw thread having a second screw pitch different from said first screw pitch;
said second half having a threaded bore with two sections of differing radii, a first section and a second section wider than said first section, said first section of said second half having said first screw pitch and being engageable with said threaded end of said bolt, said second wider section of said second half having an internal screw thread having a third screw pitch and being engageable with said external screw thread of said first half, one of said second and third screw pitches being slightly finer than the other, wherein said second and third screw pitches have different vertical lengths for lockingly deforming at least one of said external screw threads of said first half and said internal screw thread of said second section of said second half on engagement thereof, and said second wider section having a length slightly longer than a length of said short shank of said first half.
2. A fixing means comprising a bolt having a threaded end threaded at a first screw pitch and a nut member detachably engaged with said threaded end;
wherein the improvement is characterized by said nut member including a first half and a second half, said first half having a short shank with an internal screw thread therethrough and an external screw thread on said short shank, said internal screw thread of said first half having said first screw pitch and being engageable with said threaded end of said bolt, said external screw thread having a second screw pitch different from said first screw pitch, wherein said internal and external screw threads are substantially concentric with one another;
said second half having a threaded bore with two sections of differing radii, a first radius defining a first section and a second radius defining a second section wider than said first section, said first section of said second half having said first screw pitch and being engageable with said threaded end of said bolt, said second section of said second half having an internal screw thread having a third screw pitch and being engageable with said external screw thread of said first half and a length longer than a length of said short shank of said first half and one of said second and third screw pitches being finer than the other, wherein said second and third screw pitches have different vertical lengths for lockingly deforming at least one of said external screw threads of said first half and said internal screw thread of said second section of said second half on engagement thereof.
wherein the improvement is characterized by said nut member including a first half and a second half, said first half having a short shank with an internal screw thread therethrough and an external screw thread on said short shank, said internal screw thread of said first half having said first screw pitch and being engageable with said threaded end of said bolt, said external screw thread having a second screw pitch different from said first screw pitch, wherein said internal and external screw threads are substantially concentric with one another;
said second half having a threaded bore with two sections of differing radii, a first radius defining a first section and a second radius defining a second section wider than said first section, said first section of said second half having said first screw pitch and being engageable with said threaded end of said bolt, said second section of said second half having an internal screw thread having a third screw pitch and being engageable with said external screw thread of said first half and a length longer than a length of said short shank of said first half and one of said second and third screw pitches being finer than the other, wherein said second and third screw pitches have different vertical lengths for lockingly deforming at least one of said external screw threads of said first half and said internal screw thread of said second section of said second half on engagement thereof.
3. A fixing means as recited in claim 2, wherein said external screw thread of said short shank of said first half is defined by substantially constant first and second radii and said internal screw thread of said second section of said second half is defined by substantially constant third and fourth radii, a difference between said third and fourth radii defining said vertical length of said third screw pitch and a difference between said first and second radii defining said vertical length of said second screw pitch.
4. A fixing means as recited in claim 3, wherein said vertical length of said second screw pitch is greater than said vertical length of said third screw pitch.
5. A fixing means as recited in claim 2, wherein said external screw thread of said short shank of said first half is defined by first and second radii and said internal screw thread of said second section of said second radii defining said vertical length of said second screw pitch.
6. A fixing means as recited in claim 5, wherein said vertical length of said second screw pitch is greater than said vertical length of said third screw pitch.
7. A fixing means as recited in claim 1, wherein said external screw thread of said short shank of said first half is defined by substantially constant first and second radii and said internal screw thread of said second section of said second half is defined by substantially constant third and fourth radii, a difference between said third and fourth radii defining said vertical length of said third screw pitch and a difference between said first and second radii defining said vertical length of said second screw pitch.
8. A fixing means as recited in claim 7, wherein said vertical length of said second screw pitch is greater than said vertical length of said third screw pitch.
9. A fixing means as recited in claim 1, wherein said external screw thread of said short shank of said first half is defined by first and second radii and said internal screw thread of said second section of said second half is defined by third and fourth radii, a difference between said third and fourth radii defining said vertical length of said third screw pitch and a difference between said first and second radii defining said vertical length of said second screw pitch.
10. A fixing means as recited in claim 9, wherein said vertical length of said second screw pitch is greater than said vertical length of said third screw pitch.
11. A fixing means comprising a bolt having a threaded end threaded at a first screw pitch and a nut member detachably engaged with said threaded end;
wherein the improvement is characterized by said nut member including a first half and a second half, said first half having a short shank with an internal screw thread therein and an external screw thread no said short shank, said internal screw thread of said first half having said first screw pitch and being engageable with said threaded end of said bolt, said external screw thread having a second screw pitch different from said first screw pitch;
said second half having a threaded bore with two sections of differing radii, a first section and a second section wider than said first section, said first section of said second half having said first screw pitch and being engageable with said threaded end of said bolt, said second wider section of said second half having an internal screw thread having a third screw pitch and being engageable with said external screw thread of said first half, one of said second and third screw pitches being slightly finer than the other;
wherein said second and third screw pitches have different vertical lengths for lockingly deforming at least one of said external screw threads of said first half and said internal screw thread of said second section of said second half on engagement thereof.
wherein the improvement is characterized by said nut member including a first half and a second half, said first half having a short shank with an internal screw thread therein and an external screw thread no said short shank, said internal screw thread of said first half having said first screw pitch and being engageable with said threaded end of said bolt, said external screw thread having a second screw pitch different from said first screw pitch;
said second half having a threaded bore with two sections of differing radii, a first section and a second section wider than said first section, said first section of said second half having said first screw pitch and being engageable with said threaded end of said bolt, said second wider section of said second half having an internal screw thread having a third screw pitch and being engageable with said external screw thread of said first half, one of said second and third screw pitches being slightly finer than the other;
wherein said second and third screw pitches have different vertical lengths for lockingly deforming at least one of said external screw threads of said first half and said internal screw thread of said second section of said second half on engagement thereof.
12. A fixing means as recited in claim 11, wherein said external screw thread of said short shank of said first half is defined by substantially constant first and second radii and said internal screw thread of said second section of said second section of said second half is defined by substantially constant third and fourth radii;
a difference between said third and fourth radii defining said vertical length of said third screw pitch and a difference between said first and second radii defining said vertical length of said second screw pitch.
a difference between said third and fourth radii defining said vertical length of said third screw pitch and a difference between said first and second radii defining said vertical length of said second screw pitch.
13. A fixing means as recited in claim 12, wherein said vertical length of said second screw pitch is greater than said vertical length of said third screw pitch.
14. A fixing means as recited in claim 11, wherein said external screw thread of said short shank of said first half is defined by first and second radii and said internal screw thread of said second section of said second half is defined by third and fourth radii;
a difference between said third and fourth radii defining said vertical length of said third screw pitch and a difference between said first and second radii defining said vertical length of said second screw pitch.
a difference between said third and fourth radii defining said vertical length of said third screw pitch and a difference between said first and second radii defining said vertical length of said second screw pitch.
15. A fixing means as recited in claim 14, wherein said vertical length of said second screw pitch is greater than said vertical length of said third screw pitch.
10.
10.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9115994A GB2258026A (en) | 1991-07-24 | 1991-07-24 | Two-part lock nuts. |
| CA002053012A CA2053012C (en) | 1991-07-24 | 1991-10-08 | Fixing means |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9115994A GB2258026A (en) | 1991-07-24 | 1991-07-24 | Two-part lock nuts. |
| CA002053012A CA2053012C (en) | 1991-07-24 | 1991-10-08 | Fixing means |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2053012A1 CA2053012A1 (en) | 1993-04-09 |
| CA2053012C true CA2053012C (en) | 1995-01-17 |
Family
ID=25674815
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002053012A Expired - Fee Related CA2053012C (en) | 1991-07-24 | 1991-10-08 | Fixing means |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA2053012C (en) |
| GB (1) | GB2258026A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3071569B1 (en) | 2017-09-26 | 2019-10-18 | Lisi Aerospace | NUT LOCKOUT DEVICE AND ASSEMBLY ASSEMBLY THEREFOR |
| FR3071568B1 (en) * | 2017-09-26 | 2019-10-18 | Lisi Aerospace | NUT LOCKOUT DEVICE AND ASSEMBLY ASSEMBLY THEREFOR |
| FR3071570B1 (en) | 2017-09-26 | 2019-10-18 | Lisi Aerospace | NUT LOCKOUT DEVICE AND ASSEMBLY ASSEMBLY THEREFOR |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS608519A (en) * | 1983-06-27 | 1985-01-17 | 小松 実 | Double nut for preventing loosening |
| GB2233058B (en) * | 1989-06-16 | 1993-08-04 | Crawford Collets Ltd | Locking nut |
-
1991
- 1991-07-24 GB GB9115994A patent/GB2258026A/en not_active Withdrawn
- 1991-10-08 CA CA002053012A patent/CA2053012C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2053012A1 (en) | 1993-04-09 |
| GB9115994D0 (en) | 1991-09-11 |
| GB2258026A (en) | 1993-01-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |