CA1302131C - Locking fastener - Google Patents
Locking fastenerInfo
- Publication number
- CA1302131C CA1302131C CA000554769A CA554769A CA1302131C CA 1302131 C CA1302131 C CA 1302131C CA 000554769 A CA000554769 A CA 000554769A CA 554769 A CA554769 A CA 554769A CA 1302131 C CA1302131 C CA 1302131C
- Authority
- CA
- Canada
- Prior art keywords
- thread
- zone
- fastener
- crests
- flattened
- 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
- 239000000543 intermediate Substances 0.000 claims 11
- 230000013011 mating Effects 0.000 abstract description 5
- 239000011295 pitch Substances 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000001419 dependent effect Effects 0.000 description 3
- 230000003993 interaction Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 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
- 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
- F16B39/30—Locking exclusively by special shape of the screw-thread
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Dowels (AREA)
- Bolts, Nuts, And Washers (AREA)
- Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)
- Discharge Heating (AREA)
- Discharging, Photosensitive Material Shape In Electrophotography (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A vibration resistant threaded locking fastener which includes three zones of threads which extend along the length of the male threaded fastener. The first and third zones have standard thread forms for ease of assembly with the mating part and to meet the overall thread length specification for the fastener. The intermediate zone consists of a plurality of consecutive thread pitches with the crest of the threads deformed and flattened. The percentage of deformation is determined by the prevailing torque requirements of the fastener.
A vibration resistant threaded locking fastener which includes three zones of threads which extend along the length of the male threaded fastener. The first and third zones have standard thread forms for ease of assembly with the mating part and to meet the overall thread length specification for the fastener. The intermediate zone consists of a plurality of consecutive thread pitches with the crest of the threads deformed and flattened. The percentage of deformation is determined by the prevailing torque requirements of the fastener.
Description
~302~3i LOCKING FASTENER
BACKGROUND OF THE INVENTION
I. Field of the Invention This invention relates to fasteners and, in particular, to vibration resistant locking fasteners which utilize a series of deformed threads to retard release of the fastener.
II. Description of the Prior Art Interference fits between a male fastener member, such as a bolt or screw, and its receiving member has long been utilized to increase the torque necessary to remove the fastener thereby preventing inadvertent removal due to vibration. Initially, additional elements such as lock washers and the like were utilized which increased manufacturing and assembly costs. Non-circular thread forms and variable pitch threads have also been utilized to increase the torque necessary to remove the fastener.
However, such configurations require special tooling and manufacturing steps to complete the fastener.
Deformation of the thread crests has also been utilized to create the interference fit between the fastener and the nut~ Generally, a male fastener with a standard thread form is utilized in conjunction with a nut with deformed or truncated thread forms such that as the nut is mounted to the bolt, the thread crests are gradually deformed to create the interference. Usually, however, such fasteners are only usable once since the deformation cannot be reversed. Truncation of the thread forms of the male fastener have also been utilized to create an interference fit. Such devices are advantageous 1302~31 because they may be used with standard fastening nuts or a tapped hole. However, these types of fasteners are dependent upon vari-able thread forms over the entire length of the fastener or over the initial convolutions.
Because of the variable nature of the deformation, manu-facturing costs are substantially increased.
SUMMARY OF THE PRESENT INVENTIO~
The present invention overcomes the disadvantages of the prior known locking fasteners by providing a device which is simple and cost effective to manufacture yet provides the neces-sary interference fit to prevent release due to vibration.
This invention relates to a locking fastener adapted to be received in a threaded female member having a standard helical thread form, a male threaded member having a uniform axial thread pitch and consisting of three axial thread zones along its length, including:
a first engagement zone of standard helical thread forms extending through at least the initial complete convolution of the thread;
an intermediate zone extending through subsequent convolu-tions of the thread, the crests of said intermediate zone threads being uniformly flattened concentric with the thread roots along said intermediate zone thereby causing interference between the male member and female member; and a third zone of standard helical thread forms extending through the terminal convolutions of the thread of said male threaded member.
i,", :
The fastener according to the present invention includes three zones of thread forms to create the necessary interference fit. The first and third zones comprise standard thread forms to, respectively, facilitate assembly with the female or mating part and to meet the overall thread length specifications for the fastener. The second or intermediate zone includes a plurality of deformed thread crests designed to cooperate with the standard thread forms of the mating member to establish an interference fit. Preferably, the intermediate zone consists of two to eight consecutive thread convolutions depending upon the torque require-ments. The deformed thread crests are partially flattened concen-tric with the main body of the threaded member. The percentage of deformation is dependent upon the prevailing torque requirements of the part.
Deformation of the thread crests is conducted in such a manner as to maintain the overall volume of the thread. In this fashion, as the fastener is mated with the receiving member, the thread crests are re-shaped in I " ;
~ .
-`` 1302~31 accordance with the configuration of the receiving thread form thereby forming a snug interference fit.
Other objects, features, and advantages of the present invention will be apparent from the following 5detailed description taken in connection with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWING
The present invention will be more fully understood by reference to the following detailed description of a preferred embodiment of the present invention when read in 10conjunction with the accompanying drawing, in which like reference characters refer to like parts throughout the views and in which:
FIGURE 1 is a side perspective, partly in section of a fastener constructed in accordance with the present 15invention;
FIGURE 2 is a partial sectional view of 2 portion of the threads of the fastener of the present invention; and FIGURE 3 is a partial sectional view of a portion of the threads of the fastener in conjunction with a mating 20fastener.
DETAILED DESCRIPTION OF A PREFERRED
EMBODIMENT OF THE PRESENT INVENTION
Referring first to Figure 1, there is shown a locking fastener 10 embodying the present invention and generally comprising a head 12 of any known configuration and a shank or male threaded portion 14 having a helical thread 25form. Preferably, the thread form includes a substantially uniform axial thread pitch. In addition, each thread convolution includes a crest 16 and a root 18 wherein the root diameter along the length of the threaded portion 14 is uniform. The fastener 10 is adapted to be 1302~3i received in a threaded female member 20 having a standard helical thread form with conventional crest 22 and root 24 cross-sectional configurations (Fig. 3). Examples of such female receiving members include conventional fastening nuts and tapped bore holes.
The male threaded member 14 includes three thread zones along its length. The first zone A acts as an engagement zone to facilitate mating of the male member 14 with the female member 20 as is well known. Preferably, the engagement zone A includes at least one convolution of standard helical thread forms although this number may be increased depending upon the specifications for the fastener.
Intermediate thread zone B includes a plurality of subsequent thread convolutions and provides the fastener 10 with its vibration-resistant prevailing torque characteristics. The thread crests of the intermediate zone threads 30 are uniformly flattened parallel to or concentric with the roots 18 of the member 14. As is best shown in Fig. 2, the crests 32 of the threads 30 have a substantially rectangular cross-sectional configuration with a flat outer surface 34 and side walls 36 which extend inwardly perpendicular to the flat outer surface 34 to engage the standard sloped surfaces 38 of the thread form 30. Deformation of the thread crests 32 is conducted in such a manner as to substantially maintain the overall volume of the individual threads 30 such that as the fastener 10 is mated with a receiving member, the thread crests 32 are re-shaped in accordance with the receiving thread form. In the preferred embodiment of the invention, each of the threads 30 in the intermediate zone 8 are uniformly flattened such that the outer surfaces 34 of each thread convolution are even with each other and all eguidistant from the root surface 18. Moreover, the , ~
` i302131 outer surface diameter 34 is preferably between 90% and 98% of the diameter of the fully formed thread crests depending upon the torque requirements for the fastener.
In addition, the intermediate zone B consists of two to eight consecutive thread convolutions depending upon the prevailing torque requirements specified for the fastener 10 .
Referring asain to Fig. l, the third thread zone C
also consists of a plurality of standard helical thread forms through the terminal convolutions of the fastener 10. The number of thread convolutions of zone C is dependent upon the overall thread length requirements for the fastener 10. The third thread zone C terminates with the b~lt head 12.
Referring now to Fig. 3, the interference fit is created upon inserting the male fastener 10 within the female receiving member 20. Over the first few rotations of the threaded member 14 the threads of zone A cooperate with the thread forms of the female member 20 in a conventional manner. As the flattened threads 30 of zone B engage the female member 20 the rectangular crests 32 are deformed by the interaction thereof to substantially conform to the configuration of the root 24. However, because conventional thread forms are provided with a certain amount of leeway space to allow smooth coupling, the deformed crests of the present invention eliminate this space to create the interference fit. As is shown in Fig. 3, a portion of the conventional leeway space 40 is eliminated in the area of the flattened thread crest 32 such that the thread crest 32 simultaneously contacts opposing surfaces of the female thread form. Moreover, because of the uni-directional interaction of the male member 14 within the female member 20, the thread crest 32 is deformed in such a manner that the leading edge 42 of ~ 1302~3~
the thread 30 is in full contact with the female thread form while only the crest portion 32 of the trailing edge 44 is in contact with the female thread form thereby creating the interference fit. As has been noted above, the prevailing torque of the fastener 10 can be altered by varying the degree of deformation of the thread crests 32.
The foregoing detailed description has been given for clearness of understanding only and no unnecessary limitations should be understood therefrom as some modifications will be obvious to those skilled in the art without departing from the scope and spirit of the present invention as defined in the appended claims.
I claim:
BACKGROUND OF THE INVENTION
I. Field of the Invention This invention relates to fasteners and, in particular, to vibration resistant locking fasteners which utilize a series of deformed threads to retard release of the fastener.
II. Description of the Prior Art Interference fits between a male fastener member, such as a bolt or screw, and its receiving member has long been utilized to increase the torque necessary to remove the fastener thereby preventing inadvertent removal due to vibration. Initially, additional elements such as lock washers and the like were utilized which increased manufacturing and assembly costs. Non-circular thread forms and variable pitch threads have also been utilized to increase the torque necessary to remove the fastener.
However, such configurations require special tooling and manufacturing steps to complete the fastener.
Deformation of the thread crests has also been utilized to create the interference fit between the fastener and the nut~ Generally, a male fastener with a standard thread form is utilized in conjunction with a nut with deformed or truncated thread forms such that as the nut is mounted to the bolt, the thread crests are gradually deformed to create the interference. Usually, however, such fasteners are only usable once since the deformation cannot be reversed. Truncation of the thread forms of the male fastener have also been utilized to create an interference fit. Such devices are advantageous 1302~31 because they may be used with standard fastening nuts or a tapped hole. However, these types of fasteners are dependent upon vari-able thread forms over the entire length of the fastener or over the initial convolutions.
Because of the variable nature of the deformation, manu-facturing costs are substantially increased.
SUMMARY OF THE PRESENT INVENTIO~
The present invention overcomes the disadvantages of the prior known locking fasteners by providing a device which is simple and cost effective to manufacture yet provides the neces-sary interference fit to prevent release due to vibration.
This invention relates to a locking fastener adapted to be received in a threaded female member having a standard helical thread form, a male threaded member having a uniform axial thread pitch and consisting of three axial thread zones along its length, including:
a first engagement zone of standard helical thread forms extending through at least the initial complete convolution of the thread;
an intermediate zone extending through subsequent convolu-tions of the thread, the crests of said intermediate zone threads being uniformly flattened concentric with the thread roots along said intermediate zone thereby causing interference between the male member and female member; and a third zone of standard helical thread forms extending through the terminal convolutions of the thread of said male threaded member.
i,", :
The fastener according to the present invention includes three zones of thread forms to create the necessary interference fit. The first and third zones comprise standard thread forms to, respectively, facilitate assembly with the female or mating part and to meet the overall thread length specifications for the fastener. The second or intermediate zone includes a plurality of deformed thread crests designed to cooperate with the standard thread forms of the mating member to establish an interference fit. Preferably, the intermediate zone consists of two to eight consecutive thread convolutions depending upon the torque require-ments. The deformed thread crests are partially flattened concen-tric with the main body of the threaded member. The percentage of deformation is dependent upon the prevailing torque requirements of the part.
Deformation of the thread crests is conducted in such a manner as to maintain the overall volume of the thread. In this fashion, as the fastener is mated with the receiving member, the thread crests are re-shaped in I " ;
~ .
-`` 1302~31 accordance with the configuration of the receiving thread form thereby forming a snug interference fit.
Other objects, features, and advantages of the present invention will be apparent from the following 5detailed description taken in connection with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWING
The present invention will be more fully understood by reference to the following detailed description of a preferred embodiment of the present invention when read in 10conjunction with the accompanying drawing, in which like reference characters refer to like parts throughout the views and in which:
FIGURE 1 is a side perspective, partly in section of a fastener constructed in accordance with the present 15invention;
FIGURE 2 is a partial sectional view of 2 portion of the threads of the fastener of the present invention; and FIGURE 3 is a partial sectional view of a portion of the threads of the fastener in conjunction with a mating 20fastener.
DETAILED DESCRIPTION OF A PREFERRED
EMBODIMENT OF THE PRESENT INVENTION
Referring first to Figure 1, there is shown a locking fastener 10 embodying the present invention and generally comprising a head 12 of any known configuration and a shank or male threaded portion 14 having a helical thread 25form. Preferably, the thread form includes a substantially uniform axial thread pitch. In addition, each thread convolution includes a crest 16 and a root 18 wherein the root diameter along the length of the threaded portion 14 is uniform. The fastener 10 is adapted to be 1302~3i received in a threaded female member 20 having a standard helical thread form with conventional crest 22 and root 24 cross-sectional configurations (Fig. 3). Examples of such female receiving members include conventional fastening nuts and tapped bore holes.
The male threaded member 14 includes three thread zones along its length. The first zone A acts as an engagement zone to facilitate mating of the male member 14 with the female member 20 as is well known. Preferably, the engagement zone A includes at least one convolution of standard helical thread forms although this number may be increased depending upon the specifications for the fastener.
Intermediate thread zone B includes a plurality of subsequent thread convolutions and provides the fastener 10 with its vibration-resistant prevailing torque characteristics. The thread crests of the intermediate zone threads 30 are uniformly flattened parallel to or concentric with the roots 18 of the member 14. As is best shown in Fig. 2, the crests 32 of the threads 30 have a substantially rectangular cross-sectional configuration with a flat outer surface 34 and side walls 36 which extend inwardly perpendicular to the flat outer surface 34 to engage the standard sloped surfaces 38 of the thread form 30. Deformation of the thread crests 32 is conducted in such a manner as to substantially maintain the overall volume of the individual threads 30 such that as the fastener 10 is mated with a receiving member, the thread crests 32 are re-shaped in accordance with the receiving thread form. In the preferred embodiment of the invention, each of the threads 30 in the intermediate zone 8 are uniformly flattened such that the outer surfaces 34 of each thread convolution are even with each other and all eguidistant from the root surface 18. Moreover, the , ~
` i302131 outer surface diameter 34 is preferably between 90% and 98% of the diameter of the fully formed thread crests depending upon the torque requirements for the fastener.
In addition, the intermediate zone B consists of two to eight consecutive thread convolutions depending upon the prevailing torque requirements specified for the fastener 10 .
Referring asain to Fig. l, the third thread zone C
also consists of a plurality of standard helical thread forms through the terminal convolutions of the fastener 10. The number of thread convolutions of zone C is dependent upon the overall thread length requirements for the fastener 10. The third thread zone C terminates with the b~lt head 12.
Referring now to Fig. 3, the interference fit is created upon inserting the male fastener 10 within the female receiving member 20. Over the first few rotations of the threaded member 14 the threads of zone A cooperate with the thread forms of the female member 20 in a conventional manner. As the flattened threads 30 of zone B engage the female member 20 the rectangular crests 32 are deformed by the interaction thereof to substantially conform to the configuration of the root 24. However, because conventional thread forms are provided with a certain amount of leeway space to allow smooth coupling, the deformed crests of the present invention eliminate this space to create the interference fit. As is shown in Fig. 3, a portion of the conventional leeway space 40 is eliminated in the area of the flattened thread crest 32 such that the thread crest 32 simultaneously contacts opposing surfaces of the female thread form. Moreover, because of the uni-directional interaction of the male member 14 within the female member 20, the thread crest 32 is deformed in such a manner that the leading edge 42 of ~ 1302~3~
the thread 30 is in full contact with the female thread form while only the crest portion 32 of the trailing edge 44 is in contact with the female thread form thereby creating the interference fit. As has been noted above, the prevailing torque of the fastener 10 can be altered by varying the degree of deformation of the thread crests 32.
The foregoing detailed description has been given for clearness of understanding only and no unnecessary limitations should be understood therefrom as some modifications will be obvious to those skilled in the art without departing from the scope and spirit of the present invention as defined in the appended claims.
I claim:
Claims (7)
1. In a locking fastener adapted to be received in a threaded female member having a standard helical thread form, a male threaded member having a uniform axial thread pitch and consisting of three axial thread zones along its length, includ-ing:
a first engagement zone of standard helical thread forms extending through at least the initial complete convolution of the thread;
an intermediate zone extending through subsequent convolu-tions of the thread, the crests of said intermediate zone threads being uniformly flattened concentric with the thread roots along said intermediate zone thereby causing interference between the male member and female member; and a third zone of standard helical thread forms extending through the terminal convolutions of the thread of said male threaded member.
a first engagement zone of standard helical thread forms extending through at least the initial complete convolution of the thread;
an intermediate zone extending through subsequent convolu-tions of the thread, the crests of said intermediate zone threads being uniformly flattened concentric with the thread roots along said intermediate zone thereby causing interference between the male member and female member; and a third zone of standard helical thread forms extending through the terminal convolutions of the thread of said male threaded member.
2. The fastener as defined in claim 1 wherein said third thread zone terminates with head means for rotating said male threaded member.
3. The fastener as defined in claim 1 wherein said inter-mediate thread zone comprises a plurality of consecutive thread convolutions whereby the number of thread convolutions in said intermediate thread zone is directly proportional to the prevail-ing torque requirements of the fastener.
4. The fastener as defined in claim 1 wherein the diameter of the flattened thread crests of said intermediate thread zone is uniform along the length of said thread zone, said diameter being between .90 and .98 of the crest diameter of said standard helical thread forms, whereby the diameter of said flattened thread crests is directly proportional to the prevailing torque requirements of the fastener.
5. The fastener as defined in claim 1 wherein said flat-tened thread crests of said intermediate thread zone have a substantially rectangular cross-sectional configuration.
6. In a locking fastener adapted to be received in a thread-ed female member having a standard helical thread form, a male threaded member having a uniform axial thread pitch and root dia-meter throughout the major portion of its length, said male threaded member comprising three axial thread zones along its length including:
a first engagement zone of standard helical thread forms extending through at least the initial complete convolution of the thread;
an intermediate zone extending through subsequent convolu-tions of the thread, the crests of said intermediate zone threads being uniformly flattened concentric with the thread roots along said intermediate thread zone, said flattened thread crests having a substantially rectangular cross-sectional configuration wherein the outer diameter of said flattened thread crests is uniform along the length of said intermediate thread zone: and a third zone of standard helical thread forms extending through the terminal convolutions of the thread of said male threaded member.
a first engagement zone of standard helical thread forms extending through at least the initial complete convolution of the thread;
an intermediate zone extending through subsequent convolu-tions of the thread, the crests of said intermediate zone threads being uniformly flattened concentric with the thread roots along said intermediate thread zone, said flattened thread crests having a substantially rectangular cross-sectional configuration wherein the outer diameter of said flattened thread crests is uniform along the length of said intermediate thread zone: and a third zone of standard helical thread forms extending through the terminal convolutions of the thread of said male threaded member.
7. The fastener as defined in claim 6 wherein said third thread zone terminates with head means for rotating said male threaded member.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US94363686A | 1986-12-19 | 1986-12-19 | |
| US943,636 | 1986-12-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1302131C true CA1302131C (en) | 1992-06-02 |
Family
ID=25479998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000554769A Expired - Fee Related CA1302131C (en) | 1986-12-19 | 1987-12-18 | Locking fastener |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS63176810A (en) |
| CA (1) | CA1302131C (en) |
| DE (1) | DE3743010A1 (en) |
| GB (1) | GB2198801B (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02271103A (en) * | 1989-04-13 | 1990-11-06 | Lock Seal Kk | Self-locking screw member |
| DE4111854C1 (en) * | 1991-04-11 | 1992-06-17 | Sfs Stadler Holding Ag, Heerbrugg, Ch | |
| JPH0687713U (en) * | 1993-06-01 | 1994-12-22 | イワタボルト株式会社 | Lock screw |
| JPH11125230A (en) * | 1997-10-24 | 1999-05-11 | Topura Co Ltd | Detent screw |
| US6827538B2 (en) * | 2001-09-10 | 2004-12-07 | Htg-Wyandotte, Llc | Torque prevailing stud |
| DE10238055B4 (en) * | 2002-08-20 | 2004-10-28 | Ejot Gmbh & Co. Kg | Screw with self-locking thread |
| DE102005050919A1 (en) * | 2005-10-21 | 2007-04-26 | Holscher, Winfried K.W. | Locking nut or bolt has integral locking section with thread of different pitch and profile to non-locking sections, increasing force required to release it |
| US8128671B2 (en) * | 2007-04-04 | 2012-03-06 | Warsaw Orthopedic, Inc. | Variable flank bone screw |
| JP4730411B2 (en) * | 2008-08-07 | 2011-07-20 | マツダ株式会社 | Engine intake passage structure at the front of the vehicle body |
| DE102009010390A1 (en) * | 2009-02-26 | 2010-12-02 | Page Profilverbindungstechnik Gmbh | Nut, screw connection, profile connection and method for producing a nut |
| JP5027916B2 (en) | 2010-11-30 | 2012-09-19 | 日東精工株式会社 | Locking screw |
| CN102588413B (en) * | 2011-12-13 | 2014-04-02 | 温州市长江标准件有限公司 | Grounding bolt and manufacture method for same |
| WO2015049761A1 (en) * | 2013-10-03 | 2015-04-09 | 株式会社青山製作所 | Bolt |
| CN105299015B (en) * | 2015-11-27 | 2016-10-12 | 宁波敏达机电有限公司 | Paint tooth bolt processing dental lamina scraped by band |
| JP7316123B2 (en) * | 2019-07-08 | 2023-07-27 | 中島特殊鋼株式会社 | bolt and nut |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2371365A (en) * | 1942-12-07 | 1945-03-13 | American Screw Co | Locking screw and method of making |
| US3381733A (en) * | 1966-07-01 | 1968-05-07 | Glenn W. Stanwick | Thread form |
| US3520344A (en) * | 1968-07-17 | 1970-07-14 | Eric G Gabbey | Self-locking screw thread |
| US3664400A (en) * | 1970-03-02 | 1972-05-23 | George W Moore Inc | Locking set screw |
| US4150702A (en) * | 1978-02-10 | 1979-04-24 | Holmes Horace D | Locking fastener |
| US4826377A (en) * | 1981-04-27 | 1989-05-02 | Holmes Horace D | Self-locking fastener and tool for making same |
-
1987
- 1987-11-26 GB GB8727726A patent/GB2198801B/en not_active Expired - Fee Related
- 1987-12-18 CA CA000554769A patent/CA1302131C/en not_active Expired - Fee Related
- 1987-12-18 DE DE19873743010 patent/DE3743010A1/en active Granted
- 1987-12-18 JP JP31917687A patent/JPS63176810A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| GB2198801B (en) | 1991-02-20 |
| DE3743010A1 (en) | 1988-06-30 |
| GB2198801A (en) | 1988-06-22 |
| GB8727726D0 (en) | 1987-12-31 |
| DE3743010C2 (en) | 1992-01-02 |
| JPS63176810A (en) | 1988-07-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |