CA1116104A - Electrical brake lining wear indicator - Google Patents
Electrical brake lining wear indicatorInfo
- Publication number
- CA1116104A CA1116104A CA280,385A CA280385A CA1116104A CA 1116104 A CA1116104 A CA 1116104A CA 280385 A CA280385 A CA 280385A CA 1116104 A CA1116104 A CA 1116104A
- Authority
- CA
- Canada
- Prior art keywords
- brake
- brake lining
- support member
- bolt
- brake shoe
- 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
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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
- F16D66/02—Apparatus for indicating wear
- F16D66/021—Apparatus for indicating wear using electrical detection or indication means
- F16D66/022—Apparatus for indicating wear using electrical detection or indication means indicating that a lining is worn to minimum allowable thickness
- F16D66/023—Apparatus for indicating wear using electrical detection or indication means indicating that a lining is worn to minimum allowable thickness directly sensing the position of braking members
- F16D66/024—Sensors mounted on braking members adapted to contact the brake disc or drum, e.g. wire loops severed on contact
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
Abstract
ELECTRICAL BRAKE LINING WEAR INDICATOR
Abstract of the Disclosure An indicator for indicating a predetermined amount of wear of a brake lining comprises a brake lining support member operably connected to a brake actuating means and supported thereby, a brake lining is fixedly attached to the brake lining support member and when actuated by the brake actuating means frictionally engages a rotating member rotatably mounted on an axle means which carries the brake actuating means, is connected to an electrical circuit and is disposed on the brake lining support member and insulated therefrom by insulating means, the electrical switch means has a head portion which contacts the rotating member when the brake lining support member frictionally engages the rotating member and the brake lining is worn to a predetermined level to complete the electrical circuit to energize an indicatingmeans connected to the electrical circuit.
Abstract of the Disclosure An indicator for indicating a predetermined amount of wear of a brake lining comprises a brake lining support member operably connected to a brake actuating means and supported thereby, a brake lining is fixedly attached to the brake lining support member and when actuated by the brake actuating means frictionally engages a rotating member rotatably mounted on an axle means which carries the brake actuating means, is connected to an electrical circuit and is disposed on the brake lining support member and insulated therefrom by insulating means, the electrical switch means has a head portion which contacts the rotating member when the brake lining support member frictionally engages the rotating member and the brake lining is worn to a predetermined level to complete the electrical circuit to energize an indicatingmeans connected to the electrical circuit.
Description
1~16~
ELECTRICAL B~AKE LI~ING WEAR INDICATOR
Back~round o the Invention This invention relates generally to an indicator means to remotely indicate the degrees of ~ear of the vehicle brake lining. More particularily, the present invention relates to an indicator for indicating the predetermined amount of wear of the brake lining. The predetermined amount of wear being that amount characterized as "end-of-life" wear.
A continuing problem that plagues the trucking and automobile industry is the unexpected depletion of the brake linings. This occurs due to nonuniform driving and maintenance practices and procedures on the vehicle.
Should the brake linings wear to a point where the shoes or the like are exposed to the brake system they become gene~ally inoperati~e and, in fact, may cause erratic and unpredictable braking responses. This latter hazard, i.e., erratic and unpredictable brake responses, can result in placing the vehicle in an accident situatiQn- Additionally, undetected worn brake lin-ings can result in considerable damage to the various operational parts of the braking system including ~he brake drum which, in turn, may result in high repair and replacement cost~. Accortingly, from both an economic and saety point o view, it becomes imperative that a predetermined amount of wear on the brake lining may be remotely indicated or timely maintenance and repair.
Summary o the Invention According to the present invention there is provided an indicator or indicating a predetermined amount of wear of a brake lining comprising:
a brake lining support member adapted for assembly in a brake mechanism to be supported thereby, a brake lining fixedly bolted to said brake lining support member, said brake lining adapted to frictionally engage a rotating m0mber associated with said brake mechanism, an eleGtrical switch resiliently dis-posed on said brake lining support member and insulated therefr~m by a resil-3Q ient insulated bushing, said electrical switch comprising a threaded bolt attached to said brake lining support member and held thereon by a threaded f-~
~16~
nut, said insulating bushing completely surrounding said threaded bolt and extending ~hrough said support member to insulate said threaded bolt from said brake lining support member, a resilient annular insulating washer surrounding said bolt and disposed between said brake lining support member and said nut to urther insulate said nut and bolt combination from said brake lining support member, said nut capturing an electrical connector on said bolt to electrically connect it thereto, said electricaL connector electrically con-nected to an insulated wire memberl said brake lining support member being a brake shoe comprising a brake shoe table supported by and attached to a brake shoe web and said rotating member being a brake drum, said brake lining being provided in two longitudinal segments on said brake shoe table and said threaded bolt having a head di~posed within a groove formed in a longitudinal end of each of said lining segments and within an opening separating said two segments of said lining midway from the end of said table, the threaded shank of said bolt being disposed in an aperture in said brake shoe table offset on said table from an intersection of said brake shoe table and said brake;shoe web, said head of said threaded bolt having a cylindrical head portion which engages the grooves and acts as an electrical contact, said threated bolt being of brass and which material is a soter material than said drum and of a greater height than the bolt heads of the bolts that mechanically fasten said brake l~nings to said brake shoe table and said insulating bushing being provided with an annular shoulder disposed adjacent to said head pDrtion to insulate said portion rom said brake shoe table, said insul~ting washer dis-posed on the side of said brake shoe table opposite said annular shoulder~
It i`~ an object o the present invention to provide an indicator for indi`cating the predetermined amount of wear of a brake lining which is itself easy to maintain, reliable in service and generally immune to the hostile environment to which it is exposed.
Another obiect of the present invention is that the indicator is simple in deslgn and inexpensive to manufacture.
As a further important object of the present invention, the indic~
` ~161~4 tor can be manufactured using automatic high volume manufacturing techni~ues.
Oth~r objects of ~h~ present inve~tion and detalls of the struct-ure of the indicator assembly will appear more ully from the following ~, , description and accompanying drawings.
Description of the Drawings Figure I is a side elevational view partially in phantom form showing a brake shoe including a brake shoe web, a brake shoe table and a brake lining, the brake shoe embodying the preferred embodiment of the present invention;
Figure 2 is a partial sectional view in elevation taken along the line 2-2 of Figure 1.
Description of the preferred Embodiment lû Referring now to the drawings, including Figures I and 2, there is shown a brake shoe lû embodying the concept of the present invention. The brake shoe lû is adapted to be operably connected to and supported by various forms of brake mechanisms known in the prior art as, for example, the brake shoe lû is adapted to be assembled in a brake apparatus as manufactured by Rockwell International Corporation and referred to as their "STOP MASTER"
brakes. Typically, such a brake mechanism or assembly would include a brake spider (not shown) which is adapted to be bolted to an axle assembly (also not shown). The brake spider may typically form various parts of a brake actuating mechanism such as the housing for the wedge assembly and its associated 2û plungers which interact with the brake shoe 10. Typically, the wedge assembly is driven by an air chamber which is connected to the service air of the vehicle with which the brake mechanism is associated. The brake plunger, which may include a self-adjusting mechanism, typically is actuated by the wedge assembly and is in driving engagement with the ends of the brake show web 12. The brake shoe web 12 is typically formed with or fixedly attached to a brake shoe table 14.
It is the table 14 that provides the seating surface for the brake lining 16 and the brake lining 16 may be attached to the table in various ways as, for example, by a nut and bolt assembly 18. The brake lining 16 may be formed in a single piece and attached to the brake ~hoe table 14 or may be in the form of segments as shown in Figures I and 2.
- The aforementioned parts and the descriptions thereof are 1~161~4 consistent with what is known in the prior art and the present invention is to be found in the provision of an indicator for indicating a predetermined amount of wear of the brake lining 16. The basic concept of the present invention is to provide a contact means on the brake shoe lû which, when in contact with the brake drum (not shown), is contacted by the brake lining 16 and completes the circuit to indicate that a predetermined amount of brake lining has been used orconsumed.
To accomplish this object a threaded bolt 20 is disposed within aperture 22 in the brake shoe table 14. The threaded bolt 20 is provided with a lûcircular head portion 24. The threaded bolt 20 and its head portion 24 may be manufactured from cartridge brass (SAE-CA-260 wire), 1/8 hard.
It may be added at this juncture that such brass material would be softer than the material typically found on the inner surface of the brake drum. Surrounding the threaded bolt 20 is a shouldered insulator 26 whose cylindrical portion 28 surrounds a portion of the threaded shank of the bolt 20 while the shoulder 30 provides an insulating gap between the head portion 24 andthe brake shoe table 14, that is to say the shoulder 30 is provided on the same side of the brake shoe table as the head portion 24. The shouldered insulator 26may be manufactured from a wide range of insulating material, for example, 20NEMA Grade 7 material. An annular washer 32 also surrounds the insulating bolt 2û on the side of the table 14 opposite the shoulder 30 of the shouldered insulator 26. An additional insulating washer 34 may also be provided adjacent the aforementioned washer 32. Both of the washers 32 and 34 may be manufactured from the same material as the shouldered insulator 26, namely NEMA Grade 7.
A terminal 36 of the eyelet type is also disposed on the bolt 20 and to electrically connect the bolt 20 to an electrical lead 38. The function of the electrical lead 38 will be further described below. The above-noted assemblage of washers, terminals and the like are all mechanically captured on the bolt 20 by a threaded torque nut 40. In a typical arrangement, the shouldered insulator 26 3ûmay be placed in the aperture 22 in the brake shoe table 14. After assembling the insulating washers 32 and 34 and the terminal 36 on the bolt 20. The nut 40 may be torqued on the bolt 20 to approximately 30 - 40 inch pounds.
1~161Q4 The electricql lead 38, as before mentioned, electrically connects the bolt 20 to an electrical system of the vehicle in which the brake shoe 10 is installed. The electrical system may include an indicating light or the like in the driver's compartment to indicate that the brake lining 16 is worn to a predetermined point. The completion of the circuit will occur when the brass bolt 20 contacts the rotating drum against which the brake lining 16 acts. For example, it can be seen from Figure I that the bolt 20 and, more particularly, the head portion 24 thereof will contact the brake drum when the lining 16 wears to a point where its thickness is substantially equal to the height of the head portion 24 and the shoulder 30 of the shouldered insulator 26. At this point the drum will act as a ground for the electrical circuit; thus electricity will flow through the lead 38 through the terminal 36 and bolt 20 and will be grounded on and through the drum. As before noted, the brake lining 16 may be provided in segments and the bolt 20 may be provided within a bore 42 machined or drilled in the lining 16.
A suitable place for such a bore 42 would be at the opening separating the two segments of the lining 16. Further, the aperture 22 may offset on the table 14 so as not to interfere with the brake shoe web 12. The indicator, as above described, may be provided on one brake shoe per axle or may be provided for each brake shoe assemblage on the vehicle, depending upon the degree of selectivity desired. Furthermore, the shouldered insulator 26 and the insulatingwashers 32 and 34 can be of suitably resilient material such that the bolt 20 floats with respect to the brake shoe table 14.
It is, therefore, obvious that the present invention is not to be limited to the specific details of the indicator above described; but is capable of other modifications and changes without departing from the spirit and scope of the appended claims.
ELECTRICAL B~AKE LI~ING WEAR INDICATOR
Back~round o the Invention This invention relates generally to an indicator means to remotely indicate the degrees of ~ear of the vehicle brake lining. More particularily, the present invention relates to an indicator for indicating the predetermined amount of wear of the brake lining. The predetermined amount of wear being that amount characterized as "end-of-life" wear.
A continuing problem that plagues the trucking and automobile industry is the unexpected depletion of the brake linings. This occurs due to nonuniform driving and maintenance practices and procedures on the vehicle.
Should the brake linings wear to a point where the shoes or the like are exposed to the brake system they become gene~ally inoperati~e and, in fact, may cause erratic and unpredictable braking responses. This latter hazard, i.e., erratic and unpredictable brake responses, can result in placing the vehicle in an accident situatiQn- Additionally, undetected worn brake lin-ings can result in considerable damage to the various operational parts of the braking system including ~he brake drum which, in turn, may result in high repair and replacement cost~. Accortingly, from both an economic and saety point o view, it becomes imperative that a predetermined amount of wear on the brake lining may be remotely indicated or timely maintenance and repair.
Summary o the Invention According to the present invention there is provided an indicator or indicating a predetermined amount of wear of a brake lining comprising:
a brake lining support member adapted for assembly in a brake mechanism to be supported thereby, a brake lining fixedly bolted to said brake lining support member, said brake lining adapted to frictionally engage a rotating m0mber associated with said brake mechanism, an eleGtrical switch resiliently dis-posed on said brake lining support member and insulated therefr~m by a resil-3Q ient insulated bushing, said electrical switch comprising a threaded bolt attached to said brake lining support member and held thereon by a threaded f-~
~16~
nut, said insulating bushing completely surrounding said threaded bolt and extending ~hrough said support member to insulate said threaded bolt from said brake lining support member, a resilient annular insulating washer surrounding said bolt and disposed between said brake lining support member and said nut to urther insulate said nut and bolt combination from said brake lining support member, said nut capturing an electrical connector on said bolt to electrically connect it thereto, said electricaL connector electrically con-nected to an insulated wire memberl said brake lining support member being a brake shoe comprising a brake shoe table supported by and attached to a brake shoe web and said rotating member being a brake drum, said brake lining being provided in two longitudinal segments on said brake shoe table and said threaded bolt having a head di~posed within a groove formed in a longitudinal end of each of said lining segments and within an opening separating said two segments of said lining midway from the end of said table, the threaded shank of said bolt being disposed in an aperture in said brake shoe table offset on said table from an intersection of said brake shoe table and said brake;shoe web, said head of said threaded bolt having a cylindrical head portion which engages the grooves and acts as an electrical contact, said threated bolt being of brass and which material is a soter material than said drum and of a greater height than the bolt heads of the bolts that mechanically fasten said brake l~nings to said brake shoe table and said insulating bushing being provided with an annular shoulder disposed adjacent to said head pDrtion to insulate said portion rom said brake shoe table, said insul~ting washer dis-posed on the side of said brake shoe table opposite said annular shoulder~
It i`~ an object o the present invention to provide an indicator for indi`cating the predetermined amount of wear of a brake lining which is itself easy to maintain, reliable in service and generally immune to the hostile environment to which it is exposed.
Another obiect of the present invention is that the indicator is simple in deslgn and inexpensive to manufacture.
As a further important object of the present invention, the indic~
` ~161~4 tor can be manufactured using automatic high volume manufacturing techni~ues.
Oth~r objects of ~h~ present inve~tion and detalls of the struct-ure of the indicator assembly will appear more ully from the following ~, , description and accompanying drawings.
Description of the Drawings Figure I is a side elevational view partially in phantom form showing a brake shoe including a brake shoe web, a brake shoe table and a brake lining, the brake shoe embodying the preferred embodiment of the present invention;
Figure 2 is a partial sectional view in elevation taken along the line 2-2 of Figure 1.
Description of the preferred Embodiment lû Referring now to the drawings, including Figures I and 2, there is shown a brake shoe lû embodying the concept of the present invention. The brake shoe lû is adapted to be operably connected to and supported by various forms of brake mechanisms known in the prior art as, for example, the brake shoe lû is adapted to be assembled in a brake apparatus as manufactured by Rockwell International Corporation and referred to as their "STOP MASTER"
brakes. Typically, such a brake mechanism or assembly would include a brake spider (not shown) which is adapted to be bolted to an axle assembly (also not shown). The brake spider may typically form various parts of a brake actuating mechanism such as the housing for the wedge assembly and its associated 2û plungers which interact with the brake shoe 10. Typically, the wedge assembly is driven by an air chamber which is connected to the service air of the vehicle with which the brake mechanism is associated. The brake plunger, which may include a self-adjusting mechanism, typically is actuated by the wedge assembly and is in driving engagement with the ends of the brake show web 12. The brake shoe web 12 is typically formed with or fixedly attached to a brake shoe table 14.
It is the table 14 that provides the seating surface for the brake lining 16 and the brake lining 16 may be attached to the table in various ways as, for example, by a nut and bolt assembly 18. The brake lining 16 may be formed in a single piece and attached to the brake ~hoe table 14 or may be in the form of segments as shown in Figures I and 2.
- The aforementioned parts and the descriptions thereof are 1~161~4 consistent with what is known in the prior art and the present invention is to be found in the provision of an indicator for indicating a predetermined amount of wear of the brake lining 16. The basic concept of the present invention is to provide a contact means on the brake shoe lû which, when in contact with the brake drum (not shown), is contacted by the brake lining 16 and completes the circuit to indicate that a predetermined amount of brake lining has been used orconsumed.
To accomplish this object a threaded bolt 20 is disposed within aperture 22 in the brake shoe table 14. The threaded bolt 20 is provided with a lûcircular head portion 24. The threaded bolt 20 and its head portion 24 may be manufactured from cartridge brass (SAE-CA-260 wire), 1/8 hard.
It may be added at this juncture that such brass material would be softer than the material typically found on the inner surface of the brake drum. Surrounding the threaded bolt 20 is a shouldered insulator 26 whose cylindrical portion 28 surrounds a portion of the threaded shank of the bolt 20 while the shoulder 30 provides an insulating gap between the head portion 24 andthe brake shoe table 14, that is to say the shoulder 30 is provided on the same side of the brake shoe table as the head portion 24. The shouldered insulator 26may be manufactured from a wide range of insulating material, for example, 20NEMA Grade 7 material. An annular washer 32 also surrounds the insulating bolt 2û on the side of the table 14 opposite the shoulder 30 of the shouldered insulator 26. An additional insulating washer 34 may also be provided adjacent the aforementioned washer 32. Both of the washers 32 and 34 may be manufactured from the same material as the shouldered insulator 26, namely NEMA Grade 7.
A terminal 36 of the eyelet type is also disposed on the bolt 20 and to electrically connect the bolt 20 to an electrical lead 38. The function of the electrical lead 38 will be further described below. The above-noted assemblage of washers, terminals and the like are all mechanically captured on the bolt 20 by a threaded torque nut 40. In a typical arrangement, the shouldered insulator 26 3ûmay be placed in the aperture 22 in the brake shoe table 14. After assembling the insulating washers 32 and 34 and the terminal 36 on the bolt 20. The nut 40 may be torqued on the bolt 20 to approximately 30 - 40 inch pounds.
1~161Q4 The electricql lead 38, as before mentioned, electrically connects the bolt 20 to an electrical system of the vehicle in which the brake shoe 10 is installed. The electrical system may include an indicating light or the like in the driver's compartment to indicate that the brake lining 16 is worn to a predetermined point. The completion of the circuit will occur when the brass bolt 20 contacts the rotating drum against which the brake lining 16 acts. For example, it can be seen from Figure I that the bolt 20 and, more particularly, the head portion 24 thereof will contact the brake drum when the lining 16 wears to a point where its thickness is substantially equal to the height of the head portion 24 and the shoulder 30 of the shouldered insulator 26. At this point the drum will act as a ground for the electrical circuit; thus electricity will flow through the lead 38 through the terminal 36 and bolt 20 and will be grounded on and through the drum. As before noted, the brake lining 16 may be provided in segments and the bolt 20 may be provided within a bore 42 machined or drilled in the lining 16.
A suitable place for such a bore 42 would be at the opening separating the two segments of the lining 16. Further, the aperture 22 may offset on the table 14 so as not to interfere with the brake shoe web 12. The indicator, as above described, may be provided on one brake shoe per axle or may be provided for each brake shoe assemblage on the vehicle, depending upon the degree of selectivity desired. Furthermore, the shouldered insulator 26 and the insulatingwashers 32 and 34 can be of suitably resilient material such that the bolt 20 floats with respect to the brake shoe table 14.
It is, therefore, obvious that the present invention is not to be limited to the specific details of the indicator above described; but is capable of other modifications and changes without departing from the spirit and scope of the appended claims.
Claims
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An indicator for indicating a predetermined amount of wear of a brake lining comprising: a brake lining support member adapted for assembly in a brake mechanism to be supported thereby, a brake lining fixedly bolted to said brake lining support member, said brake lining adapted to frictionally engage a rotating mem-ber associated with said brake mechanism, an electrical switch resiliently disposed on said brake lining support member and in-sulated therefrom by a resilient insulating bushing, said elect-rical switch comprising a threaded bolt attached to said brake lining support member and held thereon by a threaded nut, said in-sulating bushing completely surrounding said threaded bolt and extending through said support member to insulate said threaded bolt from said brake lining support member, a resilient annular insulating washer surrounding said bolt and disposed between said brake lining support member and said nut to further insulate said nut and bolt combination from said brake lining support member, said nut capturing an electrical connector on said bolt to elec-trically connect it thereto, said electrical connector cally connected to an insulated wire member, said brake lining support member being a brake shoe comprising a brake shoe table supported by and attached to a brake shoe web and said rotating member being a brake drum, said brake lining being provided in two longitudinal segments on said brake shoe table and said threaded bolt having a head disposed within a groove formed in a longitudinal end of each of said lining segments and within an opening separating said two segments of said lining midway from the end of said table, the threaded shank of said bolt being dis-posed in an aperture in said brake shoe table offset on said table from an intersection of said brake shoe table and said brake shoe web,said head of said threaded bolt having a cylindrical head portion which engages the grooves and acts as an electrical contact, said threaded bolt being of brass and which material is a softer material than said drum and of a greater height than the bolt heads of the bolts that mechanically fasten said brake linings to said brake shoe table and said insulating bushing being provided with an annular shoulder disposed adjacent to said head portion to insulate said portion from said brake shoe table, said insulating washer disposed on the side of said brake shoe table opposite said annular shoulder.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US70743576A | 1976-07-21 | 1976-07-21 | |
| US707,435 | 1976-07-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1116104A true CA1116104A (en) | 1982-01-12 |
Family
ID=24841690
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA280,385A Expired CA1116104A (en) | 1976-07-21 | 1977-06-13 | Electrical brake lining wear indicator |
Country Status (8)
| Country | Link |
|---|---|
| JP (2) | JPS5313069A (en) |
| AU (1) | AU514555B2 (en) |
| BR (1) | BR7704778A (en) |
| CA (1) | CA1116104A (en) |
| DE (1) | DE2732676C2 (en) |
| FR (1) | FR2359322A1 (en) |
| GB (1) | GB1577230A (en) |
| SE (1) | SE434988B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3721959A1 (en) * | 1987-07-03 | 1989-01-19 | Mannesmann Kienzle Gmbh | SENSOR FOR THE OPERATING CONDITION OF BRAKES |
| DE8712263U1 (en) * | 1987-09-10 | 1987-10-29 | Bergische Achsenfabrik Fr. Kotz & Söhne, 5276 Wiehl | Device and axle body for measuring, recording and displaying important operating data of a trailer axle |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2146357A (en) * | 1936-07-09 | 1939-02-07 | Otto W Schweikle | Brake condition indicator |
| US2217176A (en) * | 1938-08-15 | 1940-10-08 | Walter W Madison | Brake wear indicating apparatus |
| US2636090A (en) * | 1950-07-13 | 1953-04-21 | Edward A Branschofsky | Vehicle brake lining wear indicator |
| US2814684A (en) * | 1956-11-08 | 1957-11-26 | Depascale Anthony | Wear indicator for brakes |
| GB980977A (en) * | 1962-09-25 | 1965-01-20 | Maurice Barton | Means for indicating visually wear in the brake linings of motor vehicles |
| GB1267518A (en) * | 1968-11-06 | 1972-03-22 | Self Energising Disc Brakes Lt | Improvements in or relating to devices for indicating the operating condition of brakes |
| DE1817601A1 (en) * | 1968-12-31 | 1970-07-16 | Wolfgang Mueller | Motor vehicle brake designed as a drum or disc brake |
| US3783979A (en) * | 1972-05-15 | 1974-01-08 | Girling Ltd | Brake pads and wear indicators therefor |
-
1977
- 1977-06-13 CA CA280,385A patent/CA1116104A/en not_active Expired
- 1977-06-16 AU AU26150/77A patent/AU514555B2/en not_active Expired
- 1977-06-20 GB GB2563677A patent/GB1577230A/en not_active Expired
- 1977-07-19 FR FR7722039A patent/FR2359322A1/en active Granted
- 1977-07-20 DE DE19772732676 patent/DE2732676C2/en not_active Expired
- 1977-07-20 SE SE7708364A patent/SE434988B/en not_active IP Right Cessation
- 1977-07-20 BR BR7704778A patent/BR7704778A/en unknown
- 1977-07-20 JP JP8618377A patent/JPS5313069A/en active Pending
-
1980
- 1980-10-28 JP JP15408580U patent/JPS5672941U/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| SE7708364L (en) | 1978-01-22 |
| BR7704778A (en) | 1978-05-02 |
| AU2615077A (en) | 1978-12-21 |
| FR2359322B1 (en) | 1983-01-07 |
| DE2732676A1 (en) | 1978-01-26 |
| JPS5313069A (en) | 1978-02-06 |
| SE434988B (en) | 1984-08-27 |
| AU514555B2 (en) | 1981-02-19 |
| GB1577230A (en) | 1980-10-22 |
| DE2732676C2 (en) | 1986-04-10 |
| JPS5672941U (en) | 1981-06-15 |
| FR2359322A1 (en) | 1978-02-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |