US3662865A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic adjuster for shoe drum brake
Assignee: Girling Ltd
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Filing: 1970-06-23
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Granted: 1972-05-16
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Expires: 1990-06-23
Abstract
Abstract A bolt on adjuster unit for auto-adjustment of the manual adjuster spindle of a drum brake comprises an actuating spring means which is loaded progressively and incrementally by successive mechanical input signals corresponding to brake shoe movements; when a predetermined number of signals have been received, the spring means is automatically released to drive a transfer means which operates to effect adjustment of the spindle. The unit also exhibits a novel manual re-setting arrangement in which a final driven member of the mechanism is formed with a ring of gear teeth in constant mesh with a pinion. A manually depressable and rotatable plunger is used to engage and rotate the pinion and driven member, and at the same time to break the driving engagement between the driven member and the rest of the transmitting mechanisms.
Inventors
- 👤 Charles Newstead
- 👤 Norman S Moss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:32
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/38; F16D65/40; F16D65/52; F16D65/56; F16D65/561
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
130 words
In an adjuster unit for use with a vehicle internal shoe drum brake having a back plate and an manual adjuster spindle projecting therethrough, said unit comprising a housing and a signal transmitting mechanism within said housing whereby in use with said housing secured to said back plate and said mechanism engaged with said spindle mechanical input signals corresponding to brake shoe movement are transmitted to said spindle to effect auto-adjustment thereof, the improved signal transmitting mechanism which comprises: resilient means; means for transmitting successive input signals to said resilient means for progressive incremental loading of the same; means responsive to completion of a predetermined number of input signals for releasing energy stored in said resilient means; and transfer means for transmitting said released energy to drive said adjuster spindle.
Claim 2
Dependent Claim
130 words
In an adjuster unit for use with a vehicle internal shoe drum brake having a back plate and an manual adjuster spindle projecting therethrough, said unit comprising a housing and a signal transmitting mechanism within said housing whereby in use with said housing secured to said back plate and said mechanism engaged with said spindle mechanical input signals corresponding to brake shoe movement are transmitted to said spindle to effect auto-adjustment thereof, the improved signal transmitting mechanism which comprises: resilient means; means for transmitting successive input signals to said resilient means for progressive incremental loading of the same; means responsive to completion of a predetermined number of input signals for releasing energy stored in said resilient means; and transfer means for transmitting said released energy to drive said adjuster spindle.
Claim 3
Dependent Claim
71 words
The improved adjuster unit of claim 1, wherein said signal transmitting mechanism comprises an oscillating input member; a rotary cam in uni-directional drive engagement with said input member and a cam follower member driven by said cam to load said resilient means incrementally as said cam is stepped round by said input member, said cam being adapted to release said follower and resilient means at selected operation positions of said cam.
Claim 4
Dependent Claim
50 words
The improved adjuster unit of claim 1, wherein said transfer means comprises a rotary transfer member rotatable by said resilient means and a final driven rotary member co-axial with said transfer member and having uni-directional driven engagement therewith, said driven member being adapted for driving engagement with said adjuster spindle.
Claim 5
Dependent Claim
142 words
The improved adjuster unit of claim 1, wherein said signal transmitting member comprises an input member journaled for reciprocation about an axis in said housing; a rotary cam rotatable about said axis and in uni-directional driven engagement with said input member; a pivoted lever cam follower operatively engaged with said rotary cam and with said resilient means; a transfer member mounted for rotation about said axis and drivingly engaged with said pivoted lever cam follower; and a final driven member mounted for rotation about said axis in uni-directional driven engagement with said transfer member and adapted for driving engagement with said adjuster spindle; and wherein successive input signal applied in operation to said rotary cam by said input member effect stepping of said cam and incremental loading of said resilient means which, when released drive said transfer member and said driven member.
Claim 6
Dependent Claim
80 words
The improved adjuster unit of claim 1, further comprising manual reset means including a final driven member of said mechanism having a ring of gear teeth therein, a rotatable pinion gear member in meshing engagement with said ring of gear teeth, a manually operable plunger mounted co-axially with said gear member for movement into and out of rotary driving engagement therewith and means responsive to movement of said plunger into driving engagement to disengage said driven member from said mechanism.
Claim 7
Dependent Claim
26 words
The improved adjuster unit of claim 5, wherein the last said means comprises pivotal lever means engageable respectively by said plunger and with said driven member.
Claim 8
Dependent Claim
33 words
The improved adjuster of claim 5 further comprising spring loaded plunger means yieldingly engaged with said pinion gear member to restrain undesired rotation of said pinion gear member and thus of driven member.
Claim 9
Dependent Claim
117 words
Means for operating an adjuster of shoe drum brakes in response to brake shoe wear, said adjuster including spindle means rotatable in a predetermined direction for effecting adjustment of said brakes, signal transmitting means responsive to brake shoe movement, resilient energy storage means, means operatively connecting said signal transmitting means with said resilient energy storage means and being constructed and arranged to progressively incrementally load said resilient means in response to signals Derived from successive brake shoe movements, means responsive to a predetermined number of said signals for releasing the energy stored in said resilient means, and transfer means for transmitting said released energy to said spindle means to rotate the same in its predetermined adjusting direction.
Claim 10
Dependent Claim
117 words
Means for operating an adjuster of shoe drum brakes in response to brake shoe wear, said adjuster including spindle means rotatable in a predetermined direction for effecting adjustment of said brakes, signal transmitting means responsive to brake shoe movement, resilient energy storage means, means operatively connecting said signal transmitting means with said resilient energy storage means and being constructed and arranged to progressively incrementally load said resilient means in response to signals Derived from successive brake shoe movements, means responsive to a predetermined number of said signals for releasing the energy stored in said resilient means, and transfer means for transmitting said released energy to said spindle means to rotate the same in its predetermined adjusting direction.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |