Patent US3744596A successfully refreshed from Google Patents.
US3744596A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic cylinder-piston unit for railway brake riggings
Assignee: Haldex AB
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Filing: 1971-12-27
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Granted: 1973-07-10
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Expires: 1991-12-27
Abstract
Abstract A pneumatically operated slack adjuster is used on an auxiliary light inexpensive brake pad used along with disc brakes on a railway wheel to clean the surface of the wheel and has two telescopically related displaceable parts, one a spindle with screw threads and the other a tubular rod with a nut threaded on the spindle with a non-locking pitch. Slack may be taken up in one or both directions when radially extending clutch surfaces are released during a braking stroke or release. The piston actuates an adjuster spring by transmitting a force to the tubular rod.
Inventors
- 👤 N Sander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:49
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/02; F16H61/0202; F16H61/0204; F16H61/0213; C; C08; C08J; C08J3/00; C08J3/20; C08J3/22; C08J3/226; B; B61; B61H; B61H1/00; B61H1/003; B60; B60T; B60T17/00; B60T17/18; B60T17/22; B60T17/228; B60W; B60W10/00; B60W10/02; B60W10/04; B60W10/06; B60W10/10; B60W10/11; B60W10/111; B60W30/00; B60W30/18; B60W30/19; B61H15/00; B61H15/0007; B61H15/0014; B61H15/0028; B61H5/00; C08J9/00; C08J9/22; C08J9/228; C08J9/236; C08J9/32; C08K; C08K7/00; C08K7/16; C08K9/00; C08K9/10; C08L; C08L101/00; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0846; C08L23/0869; C08L33/00; C08L33/04; C08L33/06; C08L33/08; C08L33/18; F16D; F16D49/00; F16D55/00; F16D55/02; F16D55/22; F16D55/224; F16D55/2245; F16D65/00; F16D65/0037; B60W2520/00; B60W2520/10; B60W2552/00; B60W2552/05; C08J2201/00; C08J2201/02; C08J2201/024; C08J2203/00; C08J2203/22; C08J2205/00; C08J2205/04; C08J2205/044; C08J2300/00; C08J2300/12; C08J2300/22; C08J2300/26; C08J2323/00; C08J2333/00; C08J2333/04; C08J2333/06; C08J2333/08; C08J2423/00; C08J2423/02; C08J2423/04; C08J2423/08; C08L2205/00; C08L2205/14; C08L2205/18; C08L2207/00; C08L2207/04; C08L2310/00; F16H2061/0216
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
103 words
Slack adjusting apparatus for a brake rigging comprising in combination, a cylinder piston transmitting force for a braking in an axial movement, a threaded spindle, a tubular rod telescopically mounted with a nut threaded on said spindle with non-locking pitch, clutch means extending radially from said spindle, cooperating clutch surfaces affixed to said piston to prevent movement of said nut on said spindle, and an adjuster spring mounted to transmit force between said piston and said tubular rod to thereby open said clutch means and permit said nut to rotate on said spindle when the braking force exceeds the force of said spring.
Claim 2
Dependent Claim
103 words
Slack adjusting apparatus for a brake rigging comprising in combination, a cylinder piston transmitting force for a braking in an axial movement, a threaded spindle, a tubular rod telescopically mounted with a nut threaded on said spindle with non-locking pitch, clutch means extending radially from said spindle, cooperating clutch surfaces affixed to said piston to prevent movement of said nut on said spindle, and an adjuster spring mounted to transmit force between said piston and said tubular rod to thereby open said clutch means and permit said nut to rotate on said spindle when the braking force exceeds the force of said spring.
Claim 3
Dependent Claim
76 words
Slack adjusting apparatus as defined in claim 1, wherein said adjuster spring is a cylindrical coil spring surrounding said tubular rod, a spring support axially engaging said piston and a shoulder surface on said tubular rod engaging said adjuster spring at opposite ends, and a spider sleeve being locked against rotation relative to said spring support and positioned to engage a stationary part of said cylinder after a predetermined axial distance of travel of the piston.
Claim 4
Dependent Claim
31 words
Slack adjusting apparatus as defined in claim 2 including an axial low friction bearing carried on said spindle and having a spring engaging said piston and said spindle through said bearing.
Claim 5
Dependent Claim
18 words
Slack adjusting apparatus as defined in claim 2 including an axially adjustable abutment for engaging said spider sleeve.
Claim 6
Dependent Claim
33 words
Slack adjusting apparatus as defined in claim 1 including further double acting means for permitting said nut to rotate on said spindle upon the return stroke of the piston when insufficient slack exists.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |