Disc brake for a bicycle

Details Disc brake for a bicycle Disc brake for a bicycle

2000-01-28

2001-06-26

Oberleitner, Robert J. (Department: 3613)

Brakes

Wheel

Axially movable brake element or housing therefor

C188S072300, C188S072900

Reexamination Certificate

active

06250438

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a disc brake, and more particularly to a disc brake for a bicycle.
2. Description of Related Art
A conventional disc brake in accordance with the prior shown in
FIGS. 6 and 7
comprises a casing (
60
) having a recess (
61
) and a chamber (
601
). The chamber (
601
) communicates with the recess (
61
) and has a through hole (
602
) in the closed end. A bushing (
603
) is securely received in the through hole (
602
). The conventional disc brake further comprises a disc (
600
) mounted on a wheel (not shown).
A push block (
65
) is securely received in the chamber (
601
) of the casing (
60
) and has a circular hole (
654
) defined in the center. One side the push block (
65
) abuts the closed end of the chamber (
601
) of the casing (
60
), and multiple elongated egg-shaped concave recesses (
651
) are formed in the second side around the hole (
654
). Each egg-shaped concave recesses (
651
) has a large diameter end (
652
) and a small diameter end (
653
) with the depth of the elongated egg-shaped concave recess (
651
) deeper at the large diameter end (
652
).
A rotating block (
63
) is received in the chamber (
601
) of the casing (
60
) with a shaft (
64
) extending from one end. The shaft (
64
) extends through the hole (
654
) in the push block (
65
) and the bushing (
603
) of the casing (
60
). The rotating block (
63
) has multiple concave recesses (
631
) that face and correspond to one of the elongated egg-shaped concave recesses (
651
). A steel ball (
67
) received between the corresponding circular recess (
631
) and elongated egg-shaped concave recess (
651
). In normal position, the steel ball (
67
) is received in the large diameter end (
652
) of the elongated egg-shaped concave recess (
651
) in the push block (
65
).
One of two brake pads (
62
) is attached to the free end of the rotating block (
63
) and the other is aligned with the first brake pad (
62
) and attached to the side of the recess (
61
) of the casing (
60
). A keyed lever (
66
) is attached to the free end of the shaft (
64
) and is held in place by a locking nut (
660
).
The shaft (
64
) and the rotating block (
63
) are moved away from the push block (
65
) when the lever (
66
) is pulled. When the lever (
66
) is pulled, the steel balls are moved from the large diameter end (
652
) of the elongated egg-shaped recess (
651
) to the to the small diameter end (
653
) thereby generating a pushing force. The force pushes the rotating block (
63
) to make the brake pads (
62
) approach and clamp the disc (
600
) that is mounted on a wheel in order to apply a braking force to the bicycle.
There is a certain distance from the centers of the steel balls to the center of the rotating block (
63
) and the push block (
65
). The force arm and the output moment are inversely proportional when the input moment is fixed. The active force of the disc brake is degraded, thereby reducing the effectiveness of the disc brake.
The present invention has arisen to mitigate and/or obviate the disadvantages of the conventional disc brake for a bicycle.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, a disc brake for a bicycle includes a casing having a recess and a through hole defined therein. The through hole communicates with the recess. A rotating block is received in the through hole of the casing and has a shaft partially extending through the casing. A press block is received in the through hole of the casing and has one side abutting the rotating block. A push rod is mounted between the rotating block and the press block. One of two brake pads is attached to one side of the recess of the casing and the other is attached to the other side of the press block. The two brake pads face each other. The two brake pads clamp a disc that is mounted on a wheel of a bicycle when the shaft of the rotating block is turned.
Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.


REFERENCES:
patent: 3155195 (1964-11-01), Brawerman
patent: 4022301 (1977-05-01), Hansen
patent: 4633978 (1987-01-01), Hoff
patent: 4838386 (1989-06-01), Yoshigai
patent: 5038895 (1991-08-01), Evans
patent: 5220790 (1993-06-01), Allart et al.

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