US3191384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-stage hydraulic master cylinder
Assignee: Individual
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Filing: 1963-05-17
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Granted: 1965-06-29
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Expires: 1983-05-17
Abstract
No abstract record available.
Inventors
- 👤 Frederick A Krusemark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:30
CPC Classifications
B; B60; B60T; B60T11/00; B60T11/10; B60T11/16; B60T11/224
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
242 words
A MULTI-STAGE MASTER CYLINDER FOR A HYDRAULIC BRAKE SYSTEM, COMPRISING IN COMBINATION: (A) A LOW PRESSURE CYLINDER, (B) A HIGH PRESSURE CYLINDER IN COAXIAL ALIGNMENT AND COMMUNICATION WITH SAID LOW PRESSURE CYLINDER, (C) A CYLINDRICAL SLEEVE OPERABLE IN SAID PRESSURE CYLINDER, (D) A CYLINDRICAL BORE IN SAID SLEEVE, (E) A COMPOUND PISTON HAVING A RELATIVELY LARGE PISTON HEAD AND A RELATIVELY SMALL PISTON HEAD OPERABLE WITHIN SAID CYLINDRICAL BORE AND SAID HIGH PRESSURE CYLINDER, SAID COMPOUND PISTON BEING DIRECTLY OPERABLY CONNECTED TO A BRAKE PEDAL, (F) A FIRST SPRING INTERPOSED BETWEEN SAID RELATIVELY LARGE PISTON HEAD AND A RETAINING MEANS AT ONE END OF SAID CYLINDRICAL BORE, URGING SAID RELATIVELY LARGE PISTON HEAD AGAINST AN ANNULAR FLANGE AT THE OPPOSITE END OF SAID CYLINDER BORE, (G) A RETURN SPRING IN SAID HIGH PRESSURE CYLINDER INTERPOSED BETWEEN SAID RELATIVELY SMALL PISTON HEAD AND A CHECK VALVE THAT OVERLIES AN OUTLET, (H) A FLUID RESERVOIR FOR SUPPLYING FLUID TO SAID CYLINDERS, (I) A VALVE MEANS SPRING INFLUENCED TO A NORMALLY CLOSED POSITION WITH RESPECT TO SAID FLUID RESERVOIR AND TO AN OPEN POSITION WITH RESPECT TO SAID HIGH PRESSURE CYLINDER, (J) A FIRST FLUID PASSAGE IN INTERCOMMUNICATION BETWEEN SAID LOW PRESSURE CYLINDER AND SAID VALVE MEANS, (K) A SECOND FLUID PASSAGE IN INTERCOMMUNICATION BETWEEN SAID LOW PRESSURE CYLINDER AND SAID HIGH PRESSURE CYLINDER, (1) AND A FIRST COMMUNICABLE BETWEEN SAID FLUID RESERVOIR AND SAID LOW PRESSURE CYLINDER POSITIONED SLIGHTLY FORWARD OF SAID CYLINDRICAL SLEEVE.
Claim 2
Dependent Claim
242 words
A MULTI-STAGE MASTER CYLINDER FOR A HYDRAULIC BRAKE SYSTEM, COMPRISING IN COMBINATION: (A) A LOW PRESSURE CYLINDER, (B) A HIGH PRESSURE CYLINDER IN COAXIAL ALIGNMENT AND COMMUNICATION WITH SAID LOW PRESSURE CYLINDER, (C) A CYLINDRICAL SLEEVE OPERABLE IN SAID PRESSURE CYLINDER, (D) A CYLINDRICAL BORE IN SAID SLEEVE, (E) A COMPOUND PISTON HAVING A RELATIVELY LARGE PISTON HEAD AND A RELATIVELY SMALL PISTON HEAD OPERABLE WITHIN SAID CYLINDRICAL BORE AND SAID HIGH PRESSURE CYLINDER, SAID COMPOUND PISTON BEING DIRECTLY OPERABLY CONNECTED TO A BRAKE PEDAL, (F) A FIRST SPRING INTERPOSED BETWEEN SAID RELATIVELY LARGE PISTON HEAD AND A RETAINING MEANS AT ONE END OF SAID CYLINDRICAL BORE, URGING SAID RELATIVELY LARGE PISTON HEAD AGAINST AN ANNULAR FLANGE AT THE OPPOSITE END OF SAID CYLINDER BORE, (G) A RETURN SPRING IN SAID HIGH PRESSURE CYLINDER INTERPOSED BETWEEN SAID RELATIVELY SMALL PISTON HEAD AND A CHECK VALVE THAT OVERLIES AN OUTLET, (H) A FLUID RESERVOIR FOR SUPPLYING FLUID TO SAID CYLINDERS, (I) A VALVE MEANS SPRING INFLUENCED TO A NORMALLY CLOSED POSITION WITH RESPECT TO SAID FLUID RESERVOIR AND TO AN OPEN POSITION WITH RESPECT TO SAID HIGH PRESSURE CYLINDER, (J) A FIRST FLUID PASSAGE IN INTERCOMMUNICATION BETWEEN SAID LOW PRESSURE CYLINDER AND SAID VALVE MEANS, (K) A SECOND FLUID PASSAGE IN INTERCOMMUNICATION BETWEEN SAID LOW PRESSURE CYLINDER AND SAID HIGH PRESSURE CYLINDER, (1) AND A FIRST COMMUNICABLE BETWEEN SAID FLUID RESERVOIR AND SAID LOW PRESSURE CYLINDER POSITIONED SLIGHTLY FORWARD OF SAID CYLINDRICAL SLEEVE.
Claim 3
Dependent Claim
127 words
A SIMPLY CONSTRUCTED AND OPERATED MOVABLE TOY ADAPTED TO IMPROVE A CHILD''S COORDINATION DURING SOLITARY PLAY WHILE SUSTAINING INTEREST WITH CONSTANT ACTION BUT WITHOUT REQUIRING SUBSTANTIAL SKILL OR EXCESSIVE ACTIVITY ON THE PART OF THE CHILD, COMPRISING: (A) A TOY HAVING A BODY INCLUDING ROLLING MEANS FOR FACILITATING EASY MOVEMENT OF SAID TOY ACROSS A SUPPORTING SURFACE; (B) A PROPELLING MEANS MOUNTED ON SAID BODY FOR EJECTING AN OBJECT PLACED ON SAID BODY; (C) POWER MEANS FOR MOVING SAID TOY MOUNTED ON SAID BODY AND CHARGED BY ROTATING SAID ROLLING MEANS IN A FIRST DIRECTION; AND (D) TRIGGER MEANS MOUNTED ON SAID BODY FOR RELEASING SAID PROPELLING MEANS, SAID TRIGGER MEANS BEING ACTUATED BY SAID POWER MEANS WHEN A SET LEVEL OF POWER IS REACHED DURING CHARGING.
Claim 4
Dependent Claim
127 words
A SIMPLY CONSTRUCTED AND OPERATED MOVABLE TOY ADAPTED TO IMPROVE A CHILD''S COORDINATION DURING SOLITARY PLAY WHILE SUSTAINING INTEREST WITH CONSTANT ACTION BUT WITHOUT REQUIRING SUBSTANTIAL SKILL OR EXCESSIVE ACTIVITY ON THE PART OF THE CHILD, COMPRISING: (A) A TOY HAVING A BODY INCLUDING ROLLING MEANS FOR FACILITATING EASY MOVEMENT OF SAID TOY ACROSS A SUPPORTING SURFACE; (B) A PROPELLING MEANS MOUNTED ON SAID BODY FOR EJECTING AN OBJECT PLACED ON SAID BODY; (C) POWER MEANS FOR MOVING SAID TOY MOUNTED ON SAID BODY AND CHARGED BY ROTATING SAID ROLLING MEANS IN A FIRST DIRECTION; AND (D) TRIGGER MEANS MOUNTED ON SAID BODY FOR RELEASING SAID PROPELLING MEANS, SAID TRIGGER MEANS BEING ACTUATED BY SAID POWER MEANS WHEN A SET LEVEL OF POWER IS REACHED DURING CHARGING.
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) | 1968-06-28 | 1968-12-28 | 1969-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-28 | 1972-12-28 | 1973-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-28 | 1976-12-28 | 1977-06-29 | $7700.00 | Window Closed / Lapsed |