GB1493832A - Brakes - Google Patents

Brakes

Info

Publication number
GB1493832A
GB1493832A GB873177A GB873177A GB1493832A GB 1493832 A GB1493832 A GB 1493832A GB 873177 A GB873177 A GB 873177A GB 873177 A GB873177 A GB 873177A GB 1493832 A GB1493832 A GB 1493832A
Authority
GB
United Kingdom
Prior art keywords
shoe
lever
brake
clearance
drum
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
Application number
GB873177A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from GB9197/74A external-priority patent/GB1493831A/en
Application filed by Individual filed Critical Individual
Priority to GB873177A priority Critical patent/GB1493832A/en
Publication of GB1493832A publication Critical patent/GB1493832A/en
Expired legal-status Critical Current

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
    • B60T7/00—Brake-action initiating means
    • B60T7/12—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger
    • B60T7/20—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger specially for trailers, e.g. in case of uncoupling of or overrunning by trailer
    • B60T7/203—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger specially for trailers, e.g. in case of uncoupling of or overrunning by trailer with automatic brake release or reduction in case of reverse travel, e.g. by means of mechanisms mounted on the draw bar
    • B60T7/206—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger specially for trailers, e.g. in case of uncoupling of or overrunning by trailer with automatic brake release or reduction in case of reverse travel, e.g. by means of mechanisms mounted on the draw bar by means of mechanisms mounted on trailer drum brakes
    • 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
    • F16D2127/00—Auxiliary mechanisms
    • F16D2127/08—Self-amplifying or de-amplifying mechanisms

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)

Abstract

1493832 Internal shoe drum brakes for trailers L C CHOUINGS 3 Jan 1975 [28 Feb 1974] 08731/77 Divided out of 1493831 Heading F2E The brake includes torque-limitation means providing a clearance which is reduced or eliminated when braking occurs with the drum rotating in one direction, R, but which is maintained when braking occurs with the drum rotating in the opposite direction F. A lever 61 is pivoted on a pin 62 fixed in relation to the back plate 58; the lever is urged against a stop 65 (one side of a fixed pin 64) by a spring 72 connected between the upper end of the lever and shoe 54. Shoe 55 engages the lever at 71, and shoe 54 at 69. When the drum is rotating in the forward direction F and the brake is applied by a floating actuator 51, spring 72 and shoe 54 both hold the lever in the position shown, so the lower end of shoe 55 remains in the position shown, with a clearance 67 between a end of a slot 63 in lever 61 and a second stop 66 (the other side of pin 64) being maintained. For brake application in the reverse direction, R, of drum rotation, the force of shoe 55 acting at a greater radius about pivot 62 than the force of shoe 54 overcomes the latter force and that of the spring 72, so lever 61 pivots, and clearance 67 substantially eliminated. Hence the lower ends of the shoes move closer together while the upper ends move further apart. Travel of the service actuator is limited, so braking torque is minimal during reverse rotation (e.g. on reversing the trailer on which the brake is mounted). A parking brake actuator (not shown), with greater travel, serves to take up the clearance and apply the shoes when the trailer is stationary.
GB873177A 1974-02-28 1975-01-03 Brakes Expired GB1493832A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB873177A GB1493832A (en) 1974-02-28 1975-01-03 Brakes

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9197/74A GB1493831A (en) 1974-02-28 1974-02-28 Brakes
GB873177A GB1493832A (en) 1974-02-28 1975-01-03 Brakes

Publications (1)

Publication Number Publication Date
GB1493832A true GB1493832A (en) 1977-11-30

Family

ID=26242377

Family Applications (1)

Application Number Title Priority Date Filing Date
GB873177A Expired GB1493832A (en) 1974-02-28 1975-01-03 Brakes

Country Status (1)

Country Link
GB (1) GB1493832A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2496802A1 (en) * 1980-12-22 1982-06-25 Olbernhau Fahrzeug DEVICE FOR SUPPORTING INNER JAW BRAKES WITH AUTOMATIC REVERSE MECHANISM FOR AN INERTIA BRAKE TRAILER
EP0253463A1 (en) * 1986-03-18 1988-01-20 John Michael Graves A collapsing mechanism for a reversing drum brake
GB2275086A (en) * 1993-02-12 1994-08-17 Allen Patricia Isabel Margaret Reversing drum brake

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2496802A1 (en) * 1980-12-22 1982-06-25 Olbernhau Fahrzeug DEVICE FOR SUPPORTING INNER JAW BRAKES WITH AUTOMATIC REVERSE MECHANISM FOR AN INERTIA BRAKE TRAILER
DE3143683A1 (en) * 1980-12-22 1982-10-28 VEB Fahrzeugwerk Olbernhau, DDR 9330 Olbernhau SUPPORT DEVICE OF INNER JAW BRAKES WITH REVERSE AUTOMATIC FOR TRAILER BRAKE TRAILERS
EP0253463A1 (en) * 1986-03-18 1988-01-20 John Michael Graves A collapsing mechanism for a reversing drum brake
GB2275086A (en) * 1993-02-12 1994-08-17 Allen Patricia Isabel Margaret Reversing drum brake

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Legal Events

Date Code Title Description
PS Patent sealed
PLE Entries relating assignments, transmissions, licences in the register of patents
PCNP Patent ceased through non-payment of renewal fee