CA1275946C - Means for connecting a brake rod to the lever arm of an automatic slack adjuster - Google Patents
Means for connecting a brake rod to the lever arm of an automatic slack adjusterInfo
- Publication number
- CA1275946C CA1275946C CA000521519A CA521519A CA1275946C CA 1275946 C CA1275946 C CA 1275946C CA 000521519 A CA000521519 A CA 000521519A CA 521519 A CA521519 A CA 521519A CA 1275946 C CA1275946 C CA 1275946C
- Authority
- CA
- Canada
- Prior art keywords
- lever arm
- bushing
- pin
- bore
- brake
- 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 - Lifetime
Links
- 230000013011 mating Effects 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims 1
- 208000036366 Sensation of pressure Diseases 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000007775 late Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Landscapes
- Braking Arrangements (AREA)
Abstract
MEANS FOR CONNECTING A BRAKE ROD TO THE
LEVER ARM OF AN AUTOMATIC SLACK ADJUSTER
Abstract of the Disclosure A slack adjuster for vehicle brakes is adapted to be mounted between the vehicle brake chamber and the vehicle brake operating shaft and includes a body which positions a drive member movable relative thereto on the brake operating shaft. A lever arm is pivoted to the body and there is an adjustable connection between the lever arm and the drive member for adjusting the rela-tionship between the drive member and the body in response to body movement required for a brake application. The improvement herein is specifically directed to a means for connecting a brake rod to the lever arm and more specifically to a bushing threaded upon the brake rod and rotatably positioned within the lever
LEVER ARM OF AN AUTOMATIC SLACK ADJUSTER
Abstract of the Disclosure A slack adjuster for vehicle brakes is adapted to be mounted between the vehicle brake chamber and the vehicle brake operating shaft and includes a body which positions a drive member movable relative thereto on the brake operating shaft. A lever arm is pivoted to the body and there is an adjustable connection between the lever arm and the drive member for adjusting the rela-tionship between the drive member and the body in response to body movement required for a brake application. The improvement herein is specifically directed to a means for connecting a brake rod to the lever arm and more specifically to a bushing threaded upon the brake rod and rotatably positioned within the lever
Description
~2~
Summary of the Invention -The present invention r~lates to slack adjusters for use in over-the-road vehicles such as trucks or the like and has par~
ticular relation to such a slack adjuster and the means for con-necting the lever arm or yoke of the slack adjuster to the brake rod~
A primar~ purpose of the invention i5 a simply con-structed, reliably operable connection of t:he type described.
Another purpose is a connection for the lever arm or 1û yoke of a vehicle slack adjuster utilizing a threaded bushing and ~ locking member which can hold the ~ushing in position within the lever arm, once the bushing has been properly positioned.
Other purposes will appear in the ensuing specifica-tion, drawings and claims.
Brief Description of the Drawin~s ~ The invention is illustrated diagrammatically in the ; following drawings wherein:
Figure 1 is a side elevation of a slack adjuster of the - type descr ibed r ~ 20 Figure 2 is an end view of the slack ad j uster lever arm : with the bushing therein, Figure 3 is a side view, in part section, of the slack adjuster lever arm or yoke, ~igure 4 is an end view of the bushing, in part section, and Figure 5 is a side view of the bushing.
Descri tion of the Preferred Embodiment P
llhe present invention relates to slack ad3usters, both manual and automatic, of the type in use today on over the-road vehicleq such as truck~ or ~he like. Such an automat,ic slack adjuster is illustrated in U.S. patent number 4,544,046 ~o Lissan which issued ~c~ober 1, 1985.
The present invention is particularly concerned with the connection between the lever arm of the slack adjuster and the brake r~d. In prior such connection~, in order to aldjust the position o~ the lever arm or yoke, as it i~ call~d in the trade, on the brake rod, it is necessary tG remove the pin connection between the yoke and the slack adjuster body, after which the yo~e may be rotated on the brake rod. The present invention provi~es a subassembly for connection in which a bushing is threaded upon the brake rod and the bushing is then positioned within a bore in the yoke. A locking member is inser~ed once the bushing has been cor-rectly adjusted relative to the yoke and the brake rod, thereby preventing further movement relative thereto and locking the as-sembly together. The pin or locking member may be easily remoYed lf f urther adjustments are required.
In the drawingsr a shaft is indicated at 10 and is the brake operating shaft of a conventi3nal over-the-road vehicle brake system. The shaft 10 may be what is known in the trade as an S ca~ shaft in reference ~o the manner in which the shaft brings about operation of the bra~es. A drive member or worm gear 12 having a plurality o~ inwardly-directed splines 14 is connected to shaft 10 w:lth gear 12 being rotatably mounted within a body indicated generally at 16. A side cover plate 18 i5 mounted to the body and a seal may be inserted where re~uired to protect the body interior.
q'he opposite end of body 16 pivotalïy mounts a yoke or lever arm 20 which ig ~ournaled to ~he body and will be oonnected to a brake rod 22. The yoke is pivotally con~-ect~dl l:o a llnk ~4 ~2~
which forms a par~ of a slack adjustment apparatus indicated gen-erally at 26. The type of slack adjustment apparatus may v~ry from that shown in the above-mentioned copending application to other such constructions or the same purpose. The present inven-tion is not concerned with the particular apparatus used to make slack adjustment or whether the adjustment is au~omatic or man-ual.
Referring specifically to the yoke 20 as illustrated in Figure 3, ~here is a bore or cylindrical chamber 28 formed therein and a bushing 30 is positioned within the chamberO The bushing has an interior threaded surface 32 which will receive the thread-ed end of brake rod 22, thus providing a connection between the brake rod and the yoke. The bushing has a cylindrical exterior surface with a tangential groove 34 formed therein, which groove is positioned opposite, in the illustration of Figure 3, to a mat-ing groove 36 formed through the interior surface of bore 28, Groove 36 is a par~ of a transverse opening or hole 37 which re-ceives a pin 38~
The combination of groove 34 in the exterior surface of 2G bushing 30 and hole 37 provides a clear opening to receive pin 38 when the bushing i5 positioned wlthin the chamber and khe grooves are aligned. Pin 38 is used as a locking member to fasten the bushing within bore 28. Prior to the time that the pin is insert-ed, the bushing may be rotated upon the threaded end of rod 22 to connect and properly adjust the position of ~he rod and the yoke.
Once the connection is made~ the grooves of the bushing and the yoke are aligned and pin 38 is inserted, Pin 38 may have a head 40 which will bear against one side of the yoke when the pin is inserted and a cotter pin or the like 42 may be used to fasten the pin ~ the yokel Bore 28 has a supporting shoulder 44, illustrated in Figure 3~ at the inner end to provide support for bushing 30 in what is called the high pressure direction, Thus, the shoulcler prevents the bushing from being driven through the yoke when pres-sure is applied during a brake application. Pin 3B resists remov-al of the bushing from the yoke in the 13w pressure direction~
The pin takes the load in the low pressure direction and shoulder 44 prevents the bushing from being pushed through the yoke in the high pressure direction~
The particular means for locking the bushing within the yoke may vary. In the arrangement shown, the bushiny exterior is cylindrical and the pin extends through a gr~ove in the exterior of the bushing. In another embodiment, the exteri~r of the bush-ing may be non-cylindrical, e.g. rectangu:Lar, hexagonal, etc. In such an arrangement, the exterior of the bushing does not require a groove as the pin may extend through the yoke and be flush against a flatted surface of the bushing which will prevent the bushing from being rotated once the pin is inserted.
The present invention provides a means for quick assem-bly of the slack adjuster to brake rod 22. Not only does it pro-vide for qui~k assembly, but adjustment of the relative position of these two elements only requires removal of the pin, rotation ~0 of the bushing and then re-insertion of the locking pin.
Whereas the preferred form of the invention has been shown and described herein, it should be realiz2d that there may be many modifications, substitutions and alterations thereto.
Summary of the Invention -The present invention r~lates to slack adjusters for use in over-the-road vehicles such as trucks or the like and has par~
ticular relation to such a slack adjuster and the means for con-necting the lever arm or yoke of the slack adjuster to the brake rod~
A primar~ purpose of the invention i5 a simply con-structed, reliably operable connection of t:he type described.
Another purpose is a connection for the lever arm or 1û yoke of a vehicle slack adjuster utilizing a threaded bushing and ~ locking member which can hold the ~ushing in position within the lever arm, once the bushing has been properly positioned.
Other purposes will appear in the ensuing specifica-tion, drawings and claims.
Brief Description of the Drawin~s ~ The invention is illustrated diagrammatically in the ; following drawings wherein:
Figure 1 is a side elevation of a slack adjuster of the - type descr ibed r ~ 20 Figure 2 is an end view of the slack ad j uster lever arm : with the bushing therein, Figure 3 is a side view, in part section, of the slack adjuster lever arm or yoke, ~igure 4 is an end view of the bushing, in part section, and Figure 5 is a side view of the bushing.
Descri tion of the Preferred Embodiment P
llhe present invention relates to slack ad3usters, both manual and automatic, of the type in use today on over the-road vehicleq such as truck~ or ~he like. Such an automat,ic slack adjuster is illustrated in U.S. patent number 4,544,046 ~o Lissan which issued ~c~ober 1, 1985.
The present invention is particularly concerned with the connection between the lever arm of the slack adjuster and the brake r~d. In prior such connection~, in order to aldjust the position o~ the lever arm or yoke, as it i~ call~d in the trade, on the brake rod, it is necessary tG remove the pin connection between the yoke and the slack adjuster body, after which the yo~e may be rotated on the brake rod. The present invention provi~es a subassembly for connection in which a bushing is threaded upon the brake rod and the bushing is then positioned within a bore in the yoke. A locking member is inser~ed once the bushing has been cor-rectly adjusted relative to the yoke and the brake rod, thereby preventing further movement relative thereto and locking the as-sembly together. The pin or locking member may be easily remoYed lf f urther adjustments are required.
In the drawingsr a shaft is indicated at 10 and is the brake operating shaft of a conventi3nal over-the-road vehicle brake system. The shaft 10 may be what is known in the trade as an S ca~ shaft in reference ~o the manner in which the shaft brings about operation of the bra~es. A drive member or worm gear 12 having a plurality o~ inwardly-directed splines 14 is connected to shaft 10 w:lth gear 12 being rotatably mounted within a body indicated generally at 16. A side cover plate 18 i5 mounted to the body and a seal may be inserted where re~uired to protect the body interior.
q'he opposite end of body 16 pivotalïy mounts a yoke or lever arm 20 which ig ~ournaled to ~he body and will be oonnected to a brake rod 22. The yoke is pivotally con~-ect~dl l:o a llnk ~4 ~2~
which forms a par~ of a slack adjustment apparatus indicated gen-erally at 26. The type of slack adjustment apparatus may v~ry from that shown in the above-mentioned copending application to other such constructions or the same purpose. The present inven-tion is not concerned with the particular apparatus used to make slack adjustment or whether the adjustment is au~omatic or man-ual.
Referring specifically to the yoke 20 as illustrated in Figure 3, ~here is a bore or cylindrical chamber 28 formed therein and a bushing 30 is positioned within the chamberO The bushing has an interior threaded surface 32 which will receive the thread-ed end of brake rod 22, thus providing a connection between the brake rod and the yoke. The bushing has a cylindrical exterior surface with a tangential groove 34 formed therein, which groove is positioned opposite, in the illustration of Figure 3, to a mat-ing groove 36 formed through the interior surface of bore 28, Groove 36 is a par~ of a transverse opening or hole 37 which re-ceives a pin 38~
The combination of groove 34 in the exterior surface of 2G bushing 30 and hole 37 provides a clear opening to receive pin 38 when the bushing i5 positioned wlthin the chamber and khe grooves are aligned. Pin 38 is used as a locking member to fasten the bushing within bore 28. Prior to the time that the pin is insert-ed, the bushing may be rotated upon the threaded end of rod 22 to connect and properly adjust the position of ~he rod and the yoke.
Once the connection is made~ the grooves of the bushing and the yoke are aligned and pin 38 is inserted, Pin 38 may have a head 40 which will bear against one side of the yoke when the pin is inserted and a cotter pin or the like 42 may be used to fasten the pin ~ the yokel Bore 28 has a supporting shoulder 44, illustrated in Figure 3~ at the inner end to provide support for bushing 30 in what is called the high pressure direction, Thus, the shoulcler prevents the bushing from being driven through the yoke when pres-sure is applied during a brake application. Pin 3B resists remov-al of the bushing from the yoke in the 13w pressure direction~
The pin takes the load in the low pressure direction and shoulder 44 prevents the bushing from being pushed through the yoke in the high pressure direction~
The particular means for locking the bushing within the yoke may vary. In the arrangement shown, the bushiny exterior is cylindrical and the pin extends through a gr~ove in the exterior of the bushing. In another embodiment, the exteri~r of the bush-ing may be non-cylindrical, e.g. rectangu:Lar, hexagonal, etc. In such an arrangement, the exterior of the bushing does not require a groove as the pin may extend through the yoke and be flush against a flatted surface of the bushing which will prevent the bushing from being rotated once the pin is inserted.
The present invention provides a means for quick assem-bly of the slack adjuster to brake rod 22. Not only does it pro-vide for qui~k assembly, but adjustment of the relative position of these two elements only requires removal of the pin, rotation ~0 of the bushing and then re-insertion of the locking pin.
Whereas the preferred form of the invention has been shown and described herein, it should be realiz2d that there may be many modifications, substitutions and alterations thereto.
Claims
1. In a slack adjuster for vehicle brakes adapted to be mounted between the brake chamber and the brake operating shaft, a body, a drive member movable relative to and positioned by said body on the brake operating shaft, a lever arm pivoted to said body, an adjustable connection between said lever arm and drive member for adjusting the relationship between said drive member and body, the improvement comprising means for connecting a brake rod to said lever arm including a generally cylindrical bore in said lever arm, a bushing having a generally cylindrical exterior surface rotatably mounted upon the brake rod and rotatably positioned within the lever arm bore, mating chordal grooves on the exterior of said bushing and in said bore, an opening extending through said lever arm and coextensive with said bore groove, a pin extending from the exterior of said lever arm, through said opening and positioned within said mating grooves to prevent rotation of said bushing relative to said lever arm when inserted therein, said pin having an enlarged head at one end which contacts the exterior of said lever arm and a fastener extending through the other end of said pin to hold said pin within said opening and thereby prevent rotation of said bushing within said lever arm bore, a reinforcing shoulder at one end of said bore for supporting said bushing, with said pin preventing pullout of said bushing from said lever arm in one direction, and said shoulder supporting said bushing in the lever arm against removal in the opposite direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000521519A CA1275946C (en) | 1986-10-27 | 1986-10-27 | Means for connecting a brake rod to the lever arm of an automatic slack adjuster |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000521519A CA1275946C (en) | 1986-10-27 | 1986-10-27 | Means for connecting a brake rod to the lever arm of an automatic slack adjuster |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1275946C true CA1275946C (en) | 1990-11-06 |
Family
ID=4134225
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000521519A Expired - Lifetime CA1275946C (en) | 1986-10-27 | 1986-10-27 | Means for connecting a brake rod to the lever arm of an automatic slack adjuster |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1275946C (en) |
-
1986
- 1986-10-27 CA CA000521519A patent/CA1275946C/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |