A brake lever assembly for actuating a hydraulic disc brake system is shown and described. The brake lever assembly provides two-stage braking by operatively connecting a lever to first and second pistons contained in a master cylinder. The first and second pistons are operatively connected to one a
A brake lever assembly for actuating a hydraulic disc brake system is shown and described. The brake lever assembly provides two-stage braking by operatively connecting a lever to first and second pistons contained in a master cylinder. The first and second pistons are operatively connected to one another such that they move together until the first piston reaches a threshold distance from a top end of the master cylinder, after which the second piston moves with respect to the first piston.
대표청구항▼
What is claimed is: 1. A master cylinder assembly comprising: a master cylinder having a length defining an axis, a top end and a bottom end, the master cylinder further defining a threshold distance along the axis from the top end of the master cylinder; a first piston having a top end and a botto
What is claimed is: 1. A master cylinder assembly comprising: a master cylinder having a length defining an axis, a top end and a bottom end, the master cylinder further defining a threshold distance along the axis from the top end of the master cylinder; a first piston having a top end and a bottom end disposed in and movable within the master cylinder, the first piston defining a distance along the axis from the top end of the master cylinder; and a second piston having a top end and a bottom end disposed in and movable within the master cylinder, the second piston being operatively connected to the first piston; wherein when the distance from the bottom end of the first piston to the top end of the master cylinder is at least the threshold distance, the second piston is movable with respect to the first piston, and wherein at least the bottom end of the second piston is movable beyond the threshold distance. 2. The master cylinder assembly of claim 1, wherein when the distance from the first piston to the top end of the master cylinder is less than the threshold distance, the second piston is not movable with respect to the first piston. 3. The master cylinder assembly of claim 1, wherein the first piston has an opening, at least a portion of the second piston is disposed in the opening and when the distance from the first piston to the top end of the master cylinder is at least the threshold distance, the second piston is movable within the opening. 4. A master cylinder assembly comprising: a master cylinder having a top end, a bottom end, and a length, the master cylinder further defining a first movement region along a first portion of its length; and a master piston assembly, comprising first and second pistons each having a top end and a bottom end, the first and second pistons being disposed in and movable within the master cylinder; wherein the first movement region extends from the top end of the master cylinder to a point past which the bottom end of the first piston cannot move, wherein when the master piston assembly is located within the first movement region, the first piston is movable together with the second piston and when the master piston assembly is at least partially outside of the first movement region, the second piston is movable with respect to the first piston and at least partially outside of the first movement region. 5. The master cylinder assembly of claim 4, wherein the master cylinder further comprises a first lengthwise region along a second portion of its length having a first cross-sectional area, and a second lengthwise region along a third portion of its length having a second cross-sectional area, and the first cross-sectional area is greater than the second cross-sectional area. 6. The master cylinder assembly of claim 4, wherein the first and second lengthwise regions are shaped to cooperatively define a projecting lip. 7. The master cylinder assembly of claim 6, further comprising a second biasing device positioned between the projecting lip and the first piston, wherein the second biasing device is configured to bias the first piston away from the projecting lip. 8. The master cylinder assembly of claim 4, wherein the first piston has an opening, at least a portion of the second piston is disposed in the opening, and the second piston is movable within the opening when the master piston assembly is not within the first movement region. 9. A hydraulic disc brake lever assembly, comprising: a housing; a lever connected to the housing and having a neutral position, a first actuating position, and a second actuating position with respect to the housing; and first and second pistons each having a top end and a bottom end disposed within the housing and operatively connected to the lever, wherein in the neutral position the bottom end of the first piston is a first distance from the bottom end of the second piston; wherein the movement of the lever from the neutral position to the first position causes the first and second pistons to move together, and the movement of the lever from the first actuating position to the second actuating position causes the second piston to move with respect to the first piston, wherein in the second actuating position the bottom end of the first piston is a second distance from the bottom end of the second piston, and wherein the second distance is greater than the first distance.
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이 특허에 인용된 특허 (17)
Kawaguchi Takeshi (Saitama JPX), Adjustable manipulating lever for motorcycle.
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