GB1302928A - - Google Patents
Info
- Publication number
- GB1302928A GB1302928A GB1302928DA GB1302928A GB 1302928 A GB1302928 A GB 1302928A GB 1302928D A GB1302928D A GB 1302928DA GB 1302928 A GB1302928 A GB 1302928A
- Authority
- GB
- United Kingdom
- Prior art keywords
- switch
- brake
- brakes
- operated
- rod
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
-
- 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
- F16D66/025—Apparatus for indicating wear using electrical detection or indication means indicating that a lining is worn to minimum allowable thickness sensing the position of parts of the brake system other than the braking members, e.g. limit switches mounted on master cylinders
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Braking Arrangements (AREA)
Abstract
1302928 Indicating; shoe drum brakes; actuators; slack adjusters BENDIX WESTINGHOUSE Ltd 11 Aug 1971 [21 Sept 1970 27 Nov 1970] 44870/70 and 56418/70 Headings F2E and F2F A two-part electric circuit for indicating whether the brakes of a vehicle are being operated and also whether there is excessive wear in any of these brakes has in its first part a normally open switch 3 which is closed when the brakes are operated by a main controlling means to illuminate a bulb 7 and has in its second part a series of normally closed switches 9 respectively associated with the brakes which switches 9 will open if the respective brake suffers excessive wear to cause de-energization of a winding 11 of as solenoid 12, previously energized by closure of switch 3, and consequent movement of an armature 14 and an associated two part shutter 15 from a position in which a part 17 of one colour (e.g. green) is aligned with the bulb 7 to a position in which a second part 16 of another colour (e.g. red) is aligned with the bulb 7. Hence illumination of the bulb 7 indicates that the brakes are operated and the colour of the light emitted by the bulb 7 indicates whether there is excessive wear in any of the brakes. Fig. 4 illustrates a practical arrangement for the juxtaposition of the bulb 7 and the shutter 15, wherein they are mounted in a box 60 with a window at the front 62. The shutter 15 is carried on an arm 63 pivoted at 64 which is urged into the position shown by a spring 65 which is overcome by energization of solenoid 12. Fig. 1 shows a second normally open switch 20 in parallel with switch 3 which switch 20 may be used to test the circuit. Fig. 5 (not shown) illustrates a circuit suitable for a tractor-trailer vehicle wherein an additional circuit part (70) for the trailer incorporating normally closed switches (71) for the brakes of the trailer is added to the arrangement of Fig. 1 on the tractor a connection (72) normally out of circuit is brought into the tractor circuit when the tractor and trailer are uncoupled. The switch 3 may be a stop-light micro-switch closed by actuation of the foot pedal (30) of a master cylinder (31), Fig. 2, not shown. As seen in Fig. 3 a switch 9 is associated with a pneumatic actuator having a brake operating rod 46 operated by a diaphragm follower 41 engaging a diaphragm. The rod 46 is encircled by the normally closed switch 9 and excessive wear of the brake causes a roller 50 on the rod 46 to engage the rearward face of the switch 9 and open it. A spring 49 protects the switch 9 against damage by ultra-excessive movement of the rod 46. In the embodiment of Fig. 6 the switch 9 is mounted on a member 75 mounted on the vehicle chassis and has a rod 74 passing therethrough connected to a pneumatic actuator. The rod 14 is operable to move a lever 73 and thence a cam 71 which operates the shoes of a shoe drum brake. On the rod 74 collars 77, 78 trap between them abutments 79, 80 and the face 81 and of abutments 79 will cause opening of switch 9 upon excessive wear of the brake. In the embodiment of Fig. 7 a manual or automatic slack adjuster 90 is connected to a pneumatic actuator 91 and the lower part of the adjuster 91 is splined onto a splined shaft 94 by operation of which brake shoes are engaged with a drum 95. An arm 92 carried by the shaft 94 has a face 93 which opens the switch 9 on excessive wear of the brake shoes: with a manual adjuster opening of the switch 9 indicates the need for adjustment and with an automatic adjuster opening of the switch 9 indicates the limit or near-limit of the adjustment facility. The switches 9 of Figs. 6, 7 may be additional to the switches 9 of Figs. 1 and 5 to provide indication of failure of the connection between the actuator and the brake. A switch 9 may be arranged within a brake drum and operated by excessive movement of the shoes; a switch 9 could also be operated by excessive movement of the calipers of a disc brake. The switch 9 can also be a rotary switch attached to a lever 73 (Fig. 6) or slack adjuster (Fig. 7). The switches 9 can also be operated by rod, wire or fluid operated means which interconnect the brake with the switch
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4487070 | 1970-09-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1302928A true GB1302928A (en) | 1973-01-10 |
Family
ID=10435058
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1302928D Expired GB1302928A (en) | 1970-09-21 | 1970-09-21 |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1302928A (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2119880A (en) * | 1982-05-11 | 1983-11-23 | Peter Burton | Braking indicator |
EP0258625A2 (en) * | 1986-09-05 | 1988-03-09 | Eaton Corporation | S cam for drum brake |
US4945818A (en) * | 1989-01-12 | 1990-08-07 | Lear Siegler Truck Products Corporation | Stroke indicator for air operated diaphragm spring brakes |
WO1995016149A1 (en) * | 1993-12-09 | 1995-06-15 | Indian Head Industries, Inc. | Heavy duty electronic brake stroke indicator |
US5649469A (en) * | 1993-05-05 | 1997-07-22 | Nai Anchorlok, Inc. | Stroke indicator for an air-operated combination diaphragm spring brake |
US5825287A (en) * | 1995-02-02 | 1998-10-20 | Indian Head Industries | Vehicle brake monitoring system |
GB2326450A (en) * | 1997-05-27 | 1998-12-23 | Sanford Acquisition Company | A brake condition sensing system |
US6255941B1 (en) | 2000-02-24 | 2001-07-03 | Indian Head Industries, Inc. | Brake monitoring system |
US6501375B1 (en) | 1996-10-11 | 2002-12-31 | Indian Head Industries, Inc. | Brake monitoring system |
-
1970
- 1970-09-21 GB GB1302928D patent/GB1302928A/en not_active Expired
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2119880A (en) * | 1982-05-11 | 1983-11-23 | Peter Burton | Braking indicator |
EP0258625A2 (en) * | 1986-09-05 | 1988-03-09 | Eaton Corporation | S cam for drum brake |
EP0258625A3 (en) * | 1986-09-05 | 1989-09-06 | Eaton Corporation | S cam for drum brake |
US4945818A (en) * | 1989-01-12 | 1990-08-07 | Lear Siegler Truck Products Corporation | Stroke indicator for air operated diaphragm spring brakes |
US5649469A (en) * | 1993-05-05 | 1997-07-22 | Nai Anchorlok, Inc. | Stroke indicator for an air-operated combination diaphragm spring brake |
WO1995016149A1 (en) * | 1993-12-09 | 1995-06-15 | Indian Head Industries, Inc. | Heavy duty electronic brake stroke indicator |
US5450930A (en) * | 1993-12-09 | 1995-09-19 | Mgm Brakes | Heavy duty electronic brake stroke indicator |
US5825287A (en) * | 1995-02-02 | 1998-10-20 | Indian Head Industries | Vehicle brake monitoring system |
US6501375B1 (en) | 1996-10-11 | 2002-12-31 | Indian Head Industries, Inc. | Brake monitoring system |
GB2326450A (en) * | 1997-05-27 | 1998-12-23 | Sanford Acquisition Company | A brake condition sensing system |
US6255941B1 (en) | 2000-02-24 | 2001-07-03 | Indian Head Industries, Inc. | Brake monitoring system |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |