CA1189365A - Reversible lock washer - Google Patents
Reversible lock washerInfo
- Publication number
- CA1189365A CA1189365A CA000458475A CA458475A CA1189365A CA 1189365 A CA1189365 A CA 1189365A CA 000458475 A CA000458475 A CA 000458475A CA 458475 A CA458475 A CA 458475A CA 1189365 A CA1189365 A CA 1189365A
- Authority
- CA
- Canada
- Prior art keywords
- ring portion
- cam
- washer
- fastener
- outer ring
- 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
- 230000002441 reversible effect Effects 0.000 title claims abstract description 11
- 230000002093 peripheral effect Effects 0.000 claims abstract description 8
- 238000010276 construction Methods 0.000 description 1
Landscapes
- Bolts, Nuts, And Washers (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A reversible lock washer in combination with a threaded fastener which has at least one cam surface. The lock washer has an annular washer body with an outer peripheral ring portion and an inner peripheral ring portion, with the inner ring portion de-fining a central opening in the washer body. The washer body is formed having oppositely positioned engaging surfaces, with each engaging surface including an inner annular recess with the width of each recess being less than the total width of the washer body to define the inner and outer ring portions. Cam means are formed on opposite sides of the inner ring member for matching engagement with the cam surface on the fastener. The cam means on the washer consist of a plurality of contiguously arranged cam members formed on the opposite sides of the inner ring portion and are disposed in the recesses with the height of the cam members being equal to or less than the depth of the recesses. The fastener consists of a screw having the cam surface formed thereon and positioned to en-gage the cam members of the washer body, the latter cam members being arranged in a counterclockwise direction when faced to engage the cam surface of the screw. Frictional means are provided on opposite sides of the outer ring portion, whereby an axial force applied to the fastener is transmitted from the inner ring portion to the outer ring portion, thereby establishing an out-wardly extended moment arm.
A reversible lock washer in combination with a threaded fastener which has at least one cam surface. The lock washer has an annular washer body with an outer peripheral ring portion and an inner peripheral ring portion, with the inner ring portion de-fining a central opening in the washer body. The washer body is formed having oppositely positioned engaging surfaces, with each engaging surface including an inner annular recess with the width of each recess being less than the total width of the washer body to define the inner and outer ring portions. Cam means are formed on opposite sides of the inner ring member for matching engagement with the cam surface on the fastener. The cam means on the washer consist of a plurality of contiguously arranged cam members formed on the opposite sides of the inner ring portion and are disposed in the recesses with the height of the cam members being equal to or less than the depth of the recesses. The fastener consists of a screw having the cam surface formed thereon and positioned to en-gage the cam members of the washer body, the latter cam members being arranged in a counterclockwise direction when faced to engage the cam surface of the screw. Frictional means are provided on opposite sides of the outer ring portion, whereby an axial force applied to the fastener is transmitted from the inner ring portion to the outer ring portion, thereby establishing an out-wardly extended moment arm.
Description
1 This application is a di~isional of Application
2 Serial No. 384,173, filed August 19, 1981.
3 Field of the Invention
4 I'his invention relates to locking devices for threaded fasteners, and more particularly -to a lock washer having rever-6 sible oppositely disposed locking surfaces.
8 Description of the Prior Art .
9 Various problems and difficulaties have been and are 10 being encountered with the known lock washers which have a 11 cam-locking surface and an oppositely disposed engaging surface, 12 such as a plurality of radial teeth. Lock washers of this tvpe 13 are generally formed having one surface consisting of a plurality 14 of contiguous cam members, and the opposite surface having a 15 plurality of radially arranged tooth members.
16 Generally, this type of washer must ~e used in pairs to 17 provide a working arrangement. Each washer must then be posi- ¦
18 tioned so that the cam surfaces are in opposing engagement with 19 each other, and the toothed surfaces are facing outwardly, so that 20 one toothed surface is posi~ioned to engage the head of a bolt or 21 the nut thereof, and the other toothed surface is positioned to 22 engage the workpiece. This type of washer is disclosed in United 23 States Patents 3,2~3,727 and 4,134,438.
24 Further, a single lock washer of this type is employed 25 wherein the undersurface of a screw head or one surface of the nuti 26 includes engaging cam members. Thus, the cam surface of the lock 27 washer will readily engaye the opposing cam surface of the head 28 or nut.
l' - 2 - .
36~
'I
1 However, during assembly of these types of fasteners and 2 lock wash~rs, error in correctly positioning the lock washer be- ¦
3 comes a critical problem. The opposing cam surfaces must be 4 positiGned correctly for locking engagement; and thus, if a lock washer is inadvertently mispositioned relative to the associated 6 cam surface of another washer or cam nut, a crucial situation 7 between the fastener and its associated workpiece is established, 8 by allowing the fastener to readi:ly loosen and separate Erom the 9 workpiece.
Hence, with the known-lock washer devices, extreme care 11 must be taken at all times when using them in the assembly of 12 parts or workpieces.
13 .
19 1.
22 .
!, ~l 1 S~MMARY AND OBJECTS OF THE IN~'ENTION
3 The present invention has for an important object to 4 provide a positive lock washer designed to be readily engageable between a fastener means and a workpiece by having two identical 6 locking sides, wherein each side thereof includes an inner 7 recessed ring ~ormed with a plu~ality of contiguous cam members, 8 and an outer raised ring defining a frictional surface for en-9 gagement with the surface of a workpiece or connecting part.
Thus, the lock washer can be randomly positioned between 11 the fastener and the workpiece, since both sides thereof are 12 identically formed. Therefore, one cam surface of the washer is 13 always positioned for engagement with the cam surface of the 14 opposing cam members formed on the bolt head or nut of the fastener, and one friction surface is always engaging the work-16 piece surface.
17 It is another object of the invention to provide a lock 18 washer that is reversible wherein the random positioning thereof I
19 will always provide an extended moment arm, whereby the clamping ¦
force of the fastener is extended outwardly about the outer, 21 annular, frictional surface for a more positive locking force 22 against the work surface.
23 A further object of the invention is to provide a revers 24 ible lock washer having opp~sitely disposed and contiguously arranged cams that are recessed within the surface and about the 26 inner peripheral edge of the washer body, thus extending inwardl~
27 a width less than the total width of the annular washer body.
28 The recessed cam portion of the washer has an outer diameter that 3Ei;~;
1 is equal to or greater than the diameter of the engaging carn 2 portion of the fastening means.
3 Another object is to provide a lock washer of this type 4 wherein the oppositely disposed surfaces of the washer body include an outer raised ring member, defining a frictional portior 6 Eor enga~ement with the surface of a workpiece, the frictional 7 portion being disposed about the outer peripheral edge of the 8 washer and extending inwardly thereof to a width substantially 9 less than the total width of the annular washer body, whereby the cam members and the frictional portion are offset from each other 11 The frictional surface may include a plurality of radially posi-12 tioned tooth members,a plain,ora continuous knurled surface. The 13 opposing frictional surface may also be tapered outwardly, 14 whereby the outer edge of the frictional ring is thicker than the~
inner edge thereof.
16 The characteristics and advantages of the invention are 17 further sufficiently referred to in connection with the accompany-18 ing drawings, which represent one embodiment. After considering ¦
19 this example, skilled persons will understand that variations may¦
20 ¦ be made without departing from the principles disclosed; and I
21 contemplate the employment of any structures, arrangements or 22 modes of operation that are properly within the scope of the 23 appended claims.
1, - 5 -3~ 5i 3 Referring more particularly to the accompanying drawings, 4 which are for illustrative purposes only:
FIG. l is a cross-sectional view of the present novel 6 lock washerinteracting with a double-sided cam-surface nut, the 7 washer being interposed between the nut of the fastener member 8 and the workpiece;
9 FIG. 2 iS a cross-sectional view of the lock washer, showing thescrewhead having an engaging cam surface;
11 FIG. 3 is a top-plan view of the present lock washer;
12 FIG. 4 iS an enlarged cross-sectional view taken sub-13 stantially along line 4-4 of FIG. 3;
'41 FIG. 5 is an enlarged top-plan view of a portion of the ¦
15l washer body having.a knurled frictional surface;
16 1 FIG. 6 is an enlarged cross-sectional view of the washer, 17¦ showing a smooth but inclined frictional surface; and 18 ¦¦ FIG. 7 is an enlarged top-plan view of a portion of the ¦
19ll washer body having another arrangement of the frictional surface.
201j . I
21'1l l 2211 ` ' I, 24l ` I
25 l! ¦
26 ~
27 li 28 !!
3 Referring more particularly to FIC,. 1, there is shown a 4 fastener means, generally indicated at 10, representing the nut-and-bolt-type fastener, having a bolt 12 which is secured to 6 a workpiece or joint member 1~ by nut 16. Interposed between the 7 nut 16 and the workpiece 14 is a reversible lock washer, generally 8 designated at 18.
9 As .is well known, this type of fastener is used under various conditions and arrangements wherein vibration may cause 11 loosening of the fastener from a workpiece. In order to prevent 12 such a problem, there is thus provided the present invention 13 which is particularly designed to prevent inadvertent placement 14 of the lock washer. Thus, lock washer 18 is formed having identical sides, allowing the washer to be randomly positioned 16 between the flat surface of the workpiece and the opposing and 17 engaging cam surface of the fastener means.
18 ¦ Accordingly, the reversible lock washer 18 comprises an 19 ¦ annular washer body 20 having a first side which includes a cam 20 ¦ means and a frictional means, and a second oppositely disposed 21 I side which also includes a cam means and a frictional means. Th2 22 ¦ washer body is formed having an inner ring member 22 which define~¦
23 ¦ the central washer opening 24 and an oppositely disposed recess 24¦! 26, and an s:uter raised peripheral ring 28.
25¦1 The cam means of the washer are formed by a plurality of 26¦¦ contiguously positioned cam members 30 which are provided on the 27¦¦ respective opposite surfaces of the inner ring. This is more 23, clearly shown in the cross-sectional view of FIG. 4. Each cam ! - 7 -.
6~
l .
1 member 30 includes an elongated inclined cam sur~ace 32 terminat~
2 ing with a front cam-locking face 34, the cam surface being in-3 clined upwardly in a counter-clockwise direction when faced to 4 engage the opposing cam surface of the nut 16. It should be notec that the cam-locking face 3~ must be equal to or less than the 6 depth of.the recess 26. FIG. 4 shows the leading cam edge below 7 the friction surface 35 of the outer raised peripheral ring 28.
8 The friction surface as previously mentioned is arranged 9 for engagement with the surface of the workpiece 14. However, th~
friction surface can be provided in various arrangements and form .
11 The preferred arrangement of the friction means comprises a 12 plurality of equally spaced tooth members 40 formed on the fric-13 tional surface 35. It is contemplated that the apex of each 14 tooth member will be tapered downwardl~ and inwardly from the outer edge thereof, as seen in FIG. 1. This is in order to 16 provide a greater leverage for the extended moment arm repre-17 sented by the distance Rf between the bolt centerline a-a and 18 the line b through the center portion of the outer ring 28. Thus, 19 the clamping force of the fastener is applied to the washer 20 through the action radius represented by Rc of the cam members.
21 That is, Rc is the radius between the centerline a-a and center-22 line c of the engaging cam members.
23 AS force is applied when tightening the fastener means, 24 the moment arm of the clamping force is transferred outwardly to the outer teeth 40, thereby providing positive locking condition 26 between the bolt and the workpiece.
27 Nut 16 in FIG, 1 includes a pair of oppositely arranged 28 cam surfaces, generally indicated at 420 Each cam surface is \
1 formed with a plurality of cam members 44 and arranged to engage 2 either cam surface of the washer body 20. Thus, nu-t 16 may also 3 be randomly mounted to bolt 12. That is, either cam surface of ~ the reversible washer 18 is adapted to engage either cam surface of the reversible nut. Thus, one cannot inadvertently miss-match 6 the nut and the washer -- which often happens with known lock 7 washers of this type.
8 Referring to FIG. 2, the fastening means 10 is shown 9 having the head 46 of screw 12a provided with a cam means ~8, com-prising a plurality of cam members 50. These cam members are also 11 arranged to engage either cam surface of the washer 18, when the 12 washer is interposed between head 46 and the workpiece 14. Thus, 13 as the screw 12a is tightened into a threaded member 16a, the same 14 reaction of the extended moment-arm forces is created as pre-viously described. I
16 It should be noted that various arrangements of the fric-j 17 tional surface may be employed, and examples of these are shown 18 herein. FIG. 5 illustrates a fxictional surface being provided 19 with a knurled raised surface 52; whereas in FIG. 6 the fxic-tional surfaces 54 are inclined inwardly from the outer edge of 21¦ the outer ring 28. ~nother frictional surface is formed on the 22 ¦outer ring 28, and it comprises a plurality of grooves 56 which 23 Idefine radial ribs 58.
24 ¦ The inventlon and its attendant advantages will be under-~
25 ¦stood from the foregoing description; and it will be apparent thati 26 ¦various changes may be made in the form, construction and arrange-27 ¦ment of the parts of the invention without departing from the 28 spirit and scope thereof or sacrificing its material advantages~
! I .
~ 3~
1 the arrangement hereinbefore described being merely by way of 2 example; and I do not wish to be restricted to the specific form 3 shown or uses mentioned, except as defined in the accompanying 4 l aims.' 11 .
~ .
24 .
.
28 ~ - lO -!
8 Description of the Prior Art .
9 Various problems and difficulaties have been and are 10 being encountered with the known lock washers which have a 11 cam-locking surface and an oppositely disposed engaging surface, 12 such as a plurality of radial teeth. Lock washers of this tvpe 13 are generally formed having one surface consisting of a plurality 14 of contiguous cam members, and the opposite surface having a 15 plurality of radially arranged tooth members.
16 Generally, this type of washer must ~e used in pairs to 17 provide a working arrangement. Each washer must then be posi- ¦
18 tioned so that the cam surfaces are in opposing engagement with 19 each other, and the toothed surfaces are facing outwardly, so that 20 one toothed surface is posi~ioned to engage the head of a bolt or 21 the nut thereof, and the other toothed surface is positioned to 22 engage the workpiece. This type of washer is disclosed in United 23 States Patents 3,2~3,727 and 4,134,438.
24 Further, a single lock washer of this type is employed 25 wherein the undersurface of a screw head or one surface of the nuti 26 includes engaging cam members. Thus, the cam surface of the lock 27 washer will readily engaye the opposing cam surface of the head 28 or nut.
l' - 2 - .
36~
'I
1 However, during assembly of these types of fasteners and 2 lock wash~rs, error in correctly positioning the lock washer be- ¦
3 comes a critical problem. The opposing cam surfaces must be 4 positiGned correctly for locking engagement; and thus, if a lock washer is inadvertently mispositioned relative to the associated 6 cam surface of another washer or cam nut, a crucial situation 7 between the fastener and its associated workpiece is established, 8 by allowing the fastener to readi:ly loosen and separate Erom the 9 workpiece.
Hence, with the known-lock washer devices, extreme care 11 must be taken at all times when using them in the assembly of 12 parts or workpieces.
13 .
19 1.
22 .
!, ~l 1 S~MMARY AND OBJECTS OF THE IN~'ENTION
3 The present invention has for an important object to 4 provide a positive lock washer designed to be readily engageable between a fastener means and a workpiece by having two identical 6 locking sides, wherein each side thereof includes an inner 7 recessed ring ~ormed with a plu~ality of contiguous cam members, 8 and an outer raised ring defining a frictional surface for en-9 gagement with the surface of a workpiece or connecting part.
Thus, the lock washer can be randomly positioned between 11 the fastener and the workpiece, since both sides thereof are 12 identically formed. Therefore, one cam surface of the washer is 13 always positioned for engagement with the cam surface of the 14 opposing cam members formed on the bolt head or nut of the fastener, and one friction surface is always engaging the work-16 piece surface.
17 It is another object of the invention to provide a lock 18 washer that is reversible wherein the random positioning thereof I
19 will always provide an extended moment arm, whereby the clamping ¦
force of the fastener is extended outwardly about the outer, 21 annular, frictional surface for a more positive locking force 22 against the work surface.
23 A further object of the invention is to provide a revers 24 ible lock washer having opp~sitely disposed and contiguously arranged cams that are recessed within the surface and about the 26 inner peripheral edge of the washer body, thus extending inwardl~
27 a width less than the total width of the annular washer body.
28 The recessed cam portion of the washer has an outer diameter that 3Ei;~;
1 is equal to or greater than the diameter of the engaging carn 2 portion of the fastening means.
3 Another object is to provide a lock washer of this type 4 wherein the oppositely disposed surfaces of the washer body include an outer raised ring member, defining a frictional portior 6 Eor enga~ement with the surface of a workpiece, the frictional 7 portion being disposed about the outer peripheral edge of the 8 washer and extending inwardly thereof to a width substantially 9 less than the total width of the annular washer body, whereby the cam members and the frictional portion are offset from each other 11 The frictional surface may include a plurality of radially posi-12 tioned tooth members,a plain,ora continuous knurled surface. The 13 opposing frictional surface may also be tapered outwardly, 14 whereby the outer edge of the frictional ring is thicker than the~
inner edge thereof.
16 The characteristics and advantages of the invention are 17 further sufficiently referred to in connection with the accompany-18 ing drawings, which represent one embodiment. After considering ¦
19 this example, skilled persons will understand that variations may¦
20 ¦ be made without departing from the principles disclosed; and I
21 contemplate the employment of any structures, arrangements or 22 modes of operation that are properly within the scope of the 23 appended claims.
1, - 5 -3~ 5i 3 Referring more particularly to the accompanying drawings, 4 which are for illustrative purposes only:
FIG. l is a cross-sectional view of the present novel 6 lock washerinteracting with a double-sided cam-surface nut, the 7 washer being interposed between the nut of the fastener member 8 and the workpiece;
9 FIG. 2 iS a cross-sectional view of the lock washer, showing thescrewhead having an engaging cam surface;
11 FIG. 3 is a top-plan view of the present lock washer;
12 FIG. 4 iS an enlarged cross-sectional view taken sub-13 stantially along line 4-4 of FIG. 3;
'41 FIG. 5 is an enlarged top-plan view of a portion of the ¦
15l washer body having.a knurled frictional surface;
16 1 FIG. 6 is an enlarged cross-sectional view of the washer, 17¦ showing a smooth but inclined frictional surface; and 18 ¦¦ FIG. 7 is an enlarged top-plan view of a portion of the ¦
19ll washer body having another arrangement of the frictional surface.
201j . I
21'1l l 2211 ` ' I, 24l ` I
25 l! ¦
26 ~
27 li 28 !!
3 Referring more particularly to FIC,. 1, there is shown a 4 fastener means, generally indicated at 10, representing the nut-and-bolt-type fastener, having a bolt 12 which is secured to 6 a workpiece or joint member 1~ by nut 16. Interposed between the 7 nut 16 and the workpiece 14 is a reversible lock washer, generally 8 designated at 18.
9 As .is well known, this type of fastener is used under various conditions and arrangements wherein vibration may cause 11 loosening of the fastener from a workpiece. In order to prevent 12 such a problem, there is thus provided the present invention 13 which is particularly designed to prevent inadvertent placement 14 of the lock washer. Thus, lock washer 18 is formed having identical sides, allowing the washer to be randomly positioned 16 between the flat surface of the workpiece and the opposing and 17 engaging cam surface of the fastener means.
18 ¦ Accordingly, the reversible lock washer 18 comprises an 19 ¦ annular washer body 20 having a first side which includes a cam 20 ¦ means and a frictional means, and a second oppositely disposed 21 I side which also includes a cam means and a frictional means. Th2 22 ¦ washer body is formed having an inner ring member 22 which define~¦
23 ¦ the central washer opening 24 and an oppositely disposed recess 24¦! 26, and an s:uter raised peripheral ring 28.
25¦1 The cam means of the washer are formed by a plurality of 26¦¦ contiguously positioned cam members 30 which are provided on the 27¦¦ respective opposite surfaces of the inner ring. This is more 23, clearly shown in the cross-sectional view of FIG. 4. Each cam ! - 7 -.
6~
l .
1 member 30 includes an elongated inclined cam sur~ace 32 terminat~
2 ing with a front cam-locking face 34, the cam surface being in-3 clined upwardly in a counter-clockwise direction when faced to 4 engage the opposing cam surface of the nut 16. It should be notec that the cam-locking face 3~ must be equal to or less than the 6 depth of.the recess 26. FIG. 4 shows the leading cam edge below 7 the friction surface 35 of the outer raised peripheral ring 28.
8 The friction surface as previously mentioned is arranged 9 for engagement with the surface of the workpiece 14. However, th~
friction surface can be provided in various arrangements and form .
11 The preferred arrangement of the friction means comprises a 12 plurality of equally spaced tooth members 40 formed on the fric-13 tional surface 35. It is contemplated that the apex of each 14 tooth member will be tapered downwardl~ and inwardly from the outer edge thereof, as seen in FIG. 1. This is in order to 16 provide a greater leverage for the extended moment arm repre-17 sented by the distance Rf between the bolt centerline a-a and 18 the line b through the center portion of the outer ring 28. Thus, 19 the clamping force of the fastener is applied to the washer 20 through the action radius represented by Rc of the cam members.
21 That is, Rc is the radius between the centerline a-a and center-22 line c of the engaging cam members.
23 AS force is applied when tightening the fastener means, 24 the moment arm of the clamping force is transferred outwardly to the outer teeth 40, thereby providing positive locking condition 26 between the bolt and the workpiece.
27 Nut 16 in FIG, 1 includes a pair of oppositely arranged 28 cam surfaces, generally indicated at 420 Each cam surface is \
1 formed with a plurality of cam members 44 and arranged to engage 2 either cam surface of the washer body 20. Thus, nu-t 16 may also 3 be randomly mounted to bolt 12. That is, either cam surface of ~ the reversible washer 18 is adapted to engage either cam surface of the reversible nut. Thus, one cannot inadvertently miss-match 6 the nut and the washer -- which often happens with known lock 7 washers of this type.
8 Referring to FIG. 2, the fastening means 10 is shown 9 having the head 46 of screw 12a provided with a cam means ~8, com-prising a plurality of cam members 50. These cam members are also 11 arranged to engage either cam surface of the washer 18, when the 12 washer is interposed between head 46 and the workpiece 14. Thus, 13 as the screw 12a is tightened into a threaded member 16a, the same 14 reaction of the extended moment-arm forces is created as pre-viously described. I
16 It should be noted that various arrangements of the fric-j 17 tional surface may be employed, and examples of these are shown 18 herein. FIG. 5 illustrates a fxictional surface being provided 19 with a knurled raised surface 52; whereas in FIG. 6 the fxic-tional surfaces 54 are inclined inwardly from the outer edge of 21¦ the outer ring 28. ~nother frictional surface is formed on the 22 ¦outer ring 28, and it comprises a plurality of grooves 56 which 23 Idefine radial ribs 58.
24 ¦ The inventlon and its attendant advantages will be under-~
25 ¦stood from the foregoing description; and it will be apparent thati 26 ¦various changes may be made in the form, construction and arrange-27 ¦ment of the parts of the invention without departing from the 28 spirit and scope thereof or sacrificing its material advantages~
! I .
~ 3~
1 the arrangement hereinbefore described being merely by way of 2 example; and I do not wish to be restricted to the specific form 3 shown or uses mentioned, except as defined in the accompanying 4 l aims.' 11 .
~ .
24 .
.
28 ~ - lO -!
Claims (4)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A reversible lock washer in combination with a fastener which has at least one cam surface, said lock washer comprising:
an annular washer body having an outer peripheral ring portion and an inner peripheral ring portion, said inner ring portion defining a central opening in said washer body;
said washer body being formed having oppositely positioned engaging surfaces;
each engaging surface including an inner annular recess, the width of each of said recesses being less than the total width of said washer body, thereby defining said inner and outer ring portions;
cam means formed on each opposite side of said inner ring member for matching engagement with said at least one cam surface on said fastener;
wherein said cam means of said washer comprising a plurality of contiguously arranged cam members formed on said opposite sides of said inner ring portion and disposed in said recesses, the height of said cam members being equal to or less than the depth of said recesses;
said fastener comprising a screw having a head member with at least one cam surface formed thereon and positioned to engage said cam members disposed in a said recess of said washer body, the latter cam members being arranged in a counter clockwise direction when faced to engage said at least one cam surface on the head member of the screw; and frictional means formed on each opposite side of said outer ring portion, whereby an axial force applied to said fastener is transmitted from said inner ring portion to said outer ring portion, thereby establishing an outwardly extended moment arm.
an annular washer body having an outer peripheral ring portion and an inner peripheral ring portion, said inner ring portion defining a central opening in said washer body;
said washer body being formed having oppositely positioned engaging surfaces;
each engaging surface including an inner annular recess, the width of each of said recesses being less than the total width of said washer body, thereby defining said inner and outer ring portions;
cam means formed on each opposite side of said inner ring member for matching engagement with said at least one cam surface on said fastener;
wherein said cam means of said washer comprising a plurality of contiguously arranged cam members formed on said opposite sides of said inner ring portion and disposed in said recesses, the height of said cam members being equal to or less than the depth of said recesses;
said fastener comprising a screw having a head member with at least one cam surface formed thereon and positioned to engage said cam members disposed in a said recess of said washer body, the latter cam members being arranged in a counter clockwise direction when faced to engage said at least one cam surface on the head member of the screw; and frictional means formed on each opposite side of said outer ring portion, whereby an axial force applied to said fastener is transmitted from said inner ring portion to said outer ring portion, thereby establishing an outwardly extended moment arm.
2. A reversible lock washer in combination as recited in claim 1, wherein said frictional means comprises a plurality of radially disposed teeth members formed on the surfaces of said sides of said outer ring portion.
3. A reversible lock washer in combination as recited in claim 2, wherein said teeth members are inclined downwardly and inwardly from the outer edge of said outer ring portion.
4. A reversible lock washer in combination as re-cited in claim 1, wherein said frictional means comprises a substantially flat surface inclined downwardly and inwardly on each side of said outer ring portion.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/180,411 US4377361A (en) | 1980-08-22 | 1980-08-22 | Reversible lock washer |
| US180,411 | 1980-08-22 | ||
| CA000384173A CA1174880A (en) | 1980-08-22 | 1981-08-19 | Reversible lock washer |
| GB08209401A GB2117857B (en) | 1980-08-22 | 1982-03-31 | Reversible lock washer |
| FR8205867A FR2524588B1 (en) | 1980-08-22 | 1982-04-05 | LOCKING WASHER THAT CAN BE USED ON ANOTHER SIDE OR ON THE OTHER, IN COMBINATION WITH A FIXING MEANS |
| DE19823212811 DE3212811C2 (en) | 1980-08-22 | 1982-04-06 | Washer for threaded fasteners with a cam formation |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000384173A Division CA1174880A (en) | 1980-08-22 | 1981-08-19 | Reversible lock washer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1189365A true CA1189365A (en) | 1985-06-25 |
Family
ID=27508197
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000458475A Expired CA1189365A (en) | 1980-08-22 | 1984-07-09 | Reversible lock washer |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1189365A (en) |
-
1984
- 1984-07-09 CA CA000458475A patent/CA1189365A/en not_active Expired
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| Date | Code | Title | Description |
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| MKEX | Expiry |
Effective date: 20020625 |