Patent US6405048B1 successfully refreshed from Google Patents.
US3589477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slack adjusting vehicle brake apparatus
Assignee: Haldex AB
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Filing: 1968-11-20
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Granted: 1971-06-29
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Expires: 1988-11-20
Abstract
Abstract A vehicle automatic slack adjuster has a feeder nut rotatable on a threaded spindle which has axial teeth engaging a movable control member clutch surface to prevent rotation when brakes are released. A stop engages the control member to release the clutch and thereafter to move it into position to compress a spring transmitting a force to the nut to cause rotation during brake application when slack occurs thereby to effect slack adjustment automatically.
Inventors
- 👤 Nils Borje Lennart Sander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:53
CPC Classifications
B; B61; B61H; B61H15/00; B61H15/0035; B61H15/0042; B61H15/0057
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
192 words
In vehicle brake apparatus of the type comprising a brake cylinder enclosing automatic slack-adjusting means with a telescopically-adjustable axially-moving brake rod having a screw threaded spindle with two nuts being freely rotatable thereon without locking to vary the effective length of the brake rod and thereby effect slack adjustment, the improvement comprising in combination, a stop secured on said cylinder, axially movable control means moving axially within said cylinder into said stop when the brake rod exceeds a predetermined movement limit during a braking operation, a first one of said nuts comprising a feeding nut having axially overlapping clutch teeth engaging said control means as a clutch to prevent its rotation when the brake is released and to move away from engagement when the control means engage said stop during a braking operation, and prestressed spring means carried by said feeder nut and arranged to engage and bias said control means only when the feeder nut moves axially a distance greater than the overlap of said clutch teeth so that the clutch is disengaged before said prestressed spring means engages the control means to thereby apply a force to said feeder nut.
Claim 2
Dependent Claim
192 words
In vehicle brake apparatus of the type comprising a brake cylinder enclosing automatic slack-adjusting means with a telescopically-adjustable axially-moving brake rod having a screw threaded spindle with two nuts being freely rotatable thereon without locking to vary the effective length of the brake rod and thereby effect slack adjustment, the improvement comprising in combination, a stop secured on said cylinder, axially movable control means moving axially within said cylinder into said stop when the brake rod exceeds a predetermined movement limit during a braking operation, a first one of said nuts comprising a feeding nut having axially overlapping clutch teeth engaging said control means as a clutch to prevent its rotation when the brake is released and to move away from engagement when the control means engage said stop during a braking operation, and prestressed spring means carried by said feeder nut and arranged to engage and bias said control means only when the feeder nut moves axially a distance greater than the overlap of said clutch teeth so that the clutch is disengaged before said prestressed spring means engages the control means to thereby apply a force to said feeder nut.
Claim 3
Dependent Claim
49 words
Apparatus as defined in claim 1 wherein the spring means comprise a compression spring having an antifriction bearing affixed to said feeder nut at one end for transmitting the spring force thereto and axially movable along said feeder nut against an abutment on the nut at its other end.
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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |