GB1339009A – Internal shoe-drum brakes
– Google Patents
GB1339009A – Internal shoe-drum brakes
– Google Patents
Internal shoe-drum brakes
Info
Publication number
GB1339009A
GB1339009A
GB4211270A
GB1339009DA
GB1339009A
GB 1339009 A
GB1339009 A
GB 1339009A
GB 4211270 A
GB4211270 A
GB 4211270A
GB 1339009D A
GB1339009D A
GB 1339009DA
GB 1339009 A
GB1339009 A
GB 1339009A
Authority
GB
United Kingdom
Prior art keywords
piston
cylinder
spindle
shoe
movement
Prior art date
1970-09-03
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
GB4211270A
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.)
Girling Ltd
Original Assignee
Girling Ltd
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.)
1970-09-03
Filing date
1970-09-03
Publication date
1973-11-28
1970-09-03
Application filed by Girling Ltd
filed
Critical
Girling Ltd
1973-11-28
Publication of GB1339009A
publication
Critical
patent/GB1339009A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
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
F16D65/00—Parts or details
F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
F16D65/22—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for pressing members apart, e.g. for 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
F16D65/00—Parts or details
F16D65/38—Slack adjusters
F16D65/40—Slack adjusters mechanical
F16D65/52—Slack adjusters mechanical self-acting in one direction for adjusting excessive play
F16D65/56—Slack adjusters mechanical self-acting in one direction for adjusting excessive play with screw-thread and nut
F16D65/561—Slack adjusters mechanical self-acting in one direction for adjusting excessive play with screw-thread and nut for mounting within the confines of a drum brake
Abstract
1339009 Mechanical and fluid-pressure actuation of drum brakes; slack-adjusting GIRLING Ltd 2 Sept 1971 [3 Sept 1970] 42112/70 Headings F2E and F2F Actuating apparatus for the arcuate shoes 10, 11 of a drum brake comprises hydraulic cylinder 14 mounted on stationary back-plate 18 for movement in a direction parallel to shoe-end movement on brake application, a piston 21 working in a bore 15 of larger diameter and adapted to engage shoe 10, a piston 25 working in a bore 16 of smaller diameter and adapted to engage shoe 11, the bores communicating, e.g. by passage 17, provision for limiting inward movement of the pistons (e.g. the ends of passage 17), and a manually-operable bell-crank lever 31, 32, pivotally mounted at 28 on the cylinder and adapted to engage shoe 11. For normal service braking fluid under pressure is supplied to the inner end of bore 15. Because of the difference in piston areas only piston 21 is moved out, the cylinder moving left by reaction, and piston 25 remaining in engagement with its shoulder. For mechanical actuation, bell crank lever 31, 32, is pivoted clockwise, urging shoe 11 outwardly. Reaction on pivot 28 on cylinder 14 moves the cylinder to the right to apply shoe 10, piston 21 remaining in engagement with its shoulder. Since the cylinder moves in one direction on hydraulic application and in the opposite direction on mechanical application, it is less likely to adhere to the back-plate when rust and dirt have affected the co-operating surfaces. Spring washers 19 are provided at this location. If the bell-crank lever is actuated while the brake is held applied hydraulically, piston 21 is initially in its outward position, but the movement of the cylinder produced by reaction on pivot pin 28 will cause the cylinder to re-engage piston 21 fully, so that the smaller piston is in turn forced outwardly, following up the shoe 11. Fig. 2 incorporates one form of slack adjuster. A spindle 35 is in irreversible screw-threaded engagement with piston 21 and the spindle head 37 is interposed between the inner end of the piston and the inner end of the bore. A screw 38 having a steep thread engaging spindle 35 has a coned head 40 co-operating with a sleeve 41 fixed in the cylinder body between bores 15 and 16. When the brake is applied hydraulically, piston 21 moves to the right taking spindle 35 with it. If owing to lining wear, piston movement exceeds the play between the threads of spindle 35 and screw 38 (running clearance), the spindle is rotated by its engagement with the screw, whereby the effective length of the piston is increased. On release, coned head 40 is disengaged from sleeve 41, and screw 38 can rotate within spindle 35, permitting the shoes to retract to their normal «off» positions. (The cylinder bores communicate by a passage not shown). Fig. 3 shows a linear slack adjuster where a rod 45 having four circumferentially-spaced rows of ratchet teeth 47 is fixed to the part of the cylinder between the bores and a ring 50 fitting freely over the rod has resilient fingers 49 having internal teeth engaging with teeth 47. When outward movement of piston 21 exceeds a certain clearance, the piston pulls the ring &c. over one or more ratchet teeth on the rod. On release, movement in the reverse direction is prevented by tooth shape and contacting coned surfaces.
GB4211270A
1970-09-03
1970-09-03
Internal shoe-drum brakes
Expired
GB1339009A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
GB4211270
1970-09-03
Publications (1)
Publication Number
Publication Date
GB1339009A
true
GB1339009A
(en)
1973-11-28
Family
ID=10422903
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB4211270A
Expired
GB1339009A
(en)
1970-09-03
1970-09-03
Internal shoe-drum brakes
Country Status (5)
Country
Link
US
(1)
US3779348A
(en)
JP
(1)
JPS5111732B1
(en)
BR
(1)
BR7105843D0
(en)
DE
(1)
DE2144270A1
(en)
GB
(1)
GB1339009A
(en)
Families Citing this family (6)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
JPS537656U
(en)
*
1976-07-07
1978-01-23
EP0047244B1
(en)
*
1980-03-13
1987-07-15
Caterpillar Industrial Inc.
Wheel brake arrangement
US4345673A
(en)
*
1980-03-13
1982-08-24
Towmotor Corporation
Wheel brake arrangement
US4549636A
(en)
*
1982-11-06
1985-10-29
Lucas Industries Public Limited Company
Disc brakes for vehicles
US5484042A
(en)
*
1991-04-04
1996-01-16
Brake And Clutch Industries Australia Pty, Ltd.
Fluid pressure and mechanical drum brake actuator
US5615754A
(en)
*
1994-03-18
1997-04-01
Tokico Ltd.
Disc brake
Family Cites Families (7)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US1972829A
(en)
*
1930-01-10
1934-09-04
Hydraulic Brake Co
Hydraulic brake
US2239916A
(en)
*
1939-06-26
1941-04-29
Motor Wheel Corp
Vehicle brake
US2281150A
(en)
*
1939-08-17
1942-04-28
Bendix Aviat Corp
Brake
US2347366A
(en)
*
1941-01-03
1944-04-25
Automotive Prod Co Ltd
Internal shoe drum brake
US2445061A
(en)
*
1946-06-20
1948-07-13
Bendix Aviat Corp
Hydraulic brake actuator
US2513015A
(en)
*
1947-01-21
1950-06-27
Floyd M Fike
Self-adjusting hydraulic brake actuator
GB961734A
(en)
*
1962-03-16
1964-06-24
Girling Ltd
Improvements in internal shoe drum brakes
1970
1970-09-03
GB
GB4211270A
patent/GB1339009A/en
not_active
Expired
1971
1971-09-02
US
US00177890A
patent/US3779348A/en
not_active
Expired – Lifetime
1971-09-03
BR
BR5843/71A
patent/BR7105843D0/en
unknown
1971-09-03
JP
JP46068478A
patent/JPS5111732B1/ja
active
Pending
1971-09-03
DE
DE19712144270
patent/DE2144270A1/en
active
Pending
Also Published As
Publication number
Publication date
BR7105843D0
(en)
1973-03-29
DE2144270A1
(en)
1972-03-30
JPS5111732B1
(en)
1976-04-13
US3779348A
(en)
1973-12-18
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(en)
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Legal Events
Date
Code
Title
Description
1974-04-10
PS
Patent sealed [section 19, patents act 1949]
1982-03-31
PCNP
Patent ceased through non-payment of renewal fee
