Brakes – Operators – Fluid pressure
Patent
1987-11-24
1989-06-27
Halvosa, George E. A.
Brakes
Operators
Fluid pressure
60378, 60584, 137209, 285 8, 285346, B60T 1100, F16D 6500
Patent
active
048421073
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to apparatus for use in the bleeding of fluid systems, and especially but not exclusively for use in the bleeding of hydraulic brakes in motor vehicles.
In the hydraulic brake system of a motor vehicle, it is possible for air pockets to develop in the fluid line from the master cylinder or reservoir to the fluid operable brake actuators at the brake shoes or pads, and this can adversely affect brake operation to a severe and even dangerous degree. Also, the quality of fluid in a fluid system can deteriorate through time so necessatating replacement of the fluid. In these situations it is necessary to bleed the fluid from the system and then pass replacement or filling fluid to the system, and in motor vehicles bleed valves are located at the brake actuators to enable bleeding of the fluid brake system. Up until now, fluid brake bleeding has been achieved by fitting a discharge pipe between the bleed valve and a collector vessel containing brake fluid, and with the bleed valve open, pumping the brake pedal to discharge fluid from the fluid line. The method is completed by closing the bleed valve and topping the system with brake fluid. However this method has not proved entirely satisfactory and it is possible for air pockets to remain in the system even after applications of the method.
It is the principal subject of the present invention to provide a fluid system bleeding apparatus enabling fluid bleeding in systems, especially of vehicle brakes, in a more efficient and convenient manner.
According to the present invention there is provided apparatus for use in the bleeding of fluid systems, especially the hydraulic brake system of a motor vehicle, which systems include a master reservoir for fluid, said apparatus comprising a fluid pumping assemblage including a primary reservoir to supply fluid to the master reservoir of a fluid system to be bled, a pump for pumping air to said primary reservoir for the displacement of fluid from the fluid reservoir, a feed conduit connecting said pump and the primary reservoir, an electric motor connectible to an electric power supply source and serving to drive said pump, and control circuit means for the electric motor, said control circuit means including an air pressure control device controlling the operation of the electric motor dependent on the air pressure supply to said primary reservoir to maintain the pressure of the displaced fluid below a predetermined limit, said fluid pumping assemblage additionally including a support member carrying said pump, the supply conduit, the electric motor and the control circuit means all in an assembled condition; a supply conduit for the delivery of fluid displaced from the primary reservoir to the master reservoir of a fluid system via a fluid supply opening in said master reservoir; and a sealing unit removably fitted at an outer end portion of said supply conduit by releasable securing means, said sealing unit including resilient sealing means enabling the sealing unit to be sealingly fitted into a fluid supply opening in a master reservoir.
An embodiment of the present invention will now be described by way of example with reference to the accompanying drawing which shows schematically a fluid bleeding apparatus serving especially for the bleeding of motor vehicle brakes and in accordance with the present invention.
Thus a fluid bleeding apparatus B includes a fluid pumping unit 1 comprising a base plate 1A carrying an air pump 2 and a primary fluid reservoir 6 receiving pressurised air from the pump 2 via a conduit 2A. Intercalated in the conduit 2A are an air filter and moisture trap 3, an air pressure gauge 4, an air pressure control switch device 14 and a one way valve 17, while the inlet to the pump 2 is provided with an air filter 9. The pump 2 includes an electric drive motor 10 supplied with electric power via a circuit C1, which has a power source in the form of batteries 11: as an alternative to the batteries 11 the circuit C1 could be plugged into an external power source such a
REFERENCES:
patent: 509353 (1893-11-01), Austin
patent: 1372928 (1921-03-01), Barton
patent: 2295539 (1942-09-01), Beach
patent: 2721089 (1955-10-01), Shames
patent: 2872951 (1959-02-01), Wilkerson
patent: 3074746 (1963-01-01), Shasmes et al.
patent: 3149762 (1964-09-01), Decker
patent: 3339401 (1967-09-01), Peters
Brodie John
Buchanan Nigel
Buchanan Nigel
Halvosa George E. A.
LandOfFree
Fluid system bleeding apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fluid system bleeding apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fluid system bleeding apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-806356