US4557109A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brake for a hydraulic motor
Assignee: KOMATSU SEISAKUSHO 3-6 AAKASAKA 2-CHOME MINATO-KU TOKYO JAPAN KK
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Filing: 1983-07-22
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Granted: 1985-12-10
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Expires: 2003-07-22
Abstract
Abstract A spring applied and hydraulically released motor shaft brake apparatus for a hydraulic motor which is compact in size. The brake apparatus includes a piston slidably mounted in a cylinder defining a brake chamber and a drain chamber. The piston is slidably and rotatably mounted on the motor shaft and a spring is disposed in the drain chamber for biasing the piston towards the brake chamber to thereby lock the motor shaft against rotation. The brake chamber is selectively connectible with a pressurized fluid source while the drain chamber is connected with a drain. The piston has formed therein a passage with a restrictor disposed therein for restricting flow of fluid in the passage.
Inventors
- 👤 Yoshikazu Nagahara
- 👤 Nobuaki Inaba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:38
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/12; B60T13/22
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
151 words
A brake apparatus in combination with a hydraulic moter having a rotatable output shaft, said apparatus comprising: a cylinder; a piston slidably mounted in said cylinder defining with said cylinder a first and a second chamber, said piston being slidably and rotatably mounted on the output shaft, said first chamber being selectively communicated with a pressurized fluid source and said second chamber being communicated with a drain; spring means for biasing said piston towards said first chamber; means for locking the output shaft against rotation when biased by said spring means; a passage formed in said piston for communicating said first chamber with said second chamber; a restrictor formed in said passage for restricting flow of fluid in said passage; and a closure wall formed integral with the cylinder wall for closing said passage when said piston is hydraulically biased towards said second chamber against the bias of said spring means.
Claim 2
Dependent Claim
151 words
A brake apparatus in combination with a hydraulic moter having a rotatable output shaft, said apparatus comprising: a cylinder; a piston slidably mounted in said cylinder defining with said cylinder a first and a second chamber, said piston being slidably and rotatably mounted on the output shaft, said first chamber being selectively communicated with a pressurized fluid source and said second chamber being communicated with a drain; spring means for biasing said piston towards said first chamber; means for locking the output shaft against rotation when biased by said spring means; a passage formed in said piston for communicating said first chamber with said second chamber; a restrictor formed in said passage for restricting flow of fluid in said passage; and a closure wall formed integral with the cylinder wall for closing said passage when said piston is hydraulically biased towards said second chamber against the bias of said spring means.
Claim 3
Dependent Claim
40 words
A brake apparatus according to claim 1 wherein said locking means comprises a plurality of disks fixedly secured to said output shaft and a plurality of plates fixedly secured to said cylinder, said disks and said plates being alternately arranged.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-12-09 | 1989-06-10 | 1989-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-09 | 1993-06-10 | 1993-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-09 | 1997-06-10 | 1997-12-10 | $7700.00 | Window Closed / Lapsed |