Machine element or mechanism – Control lever and linkage systems – Hand operated
Reexamination Certificate
2003-10-02
2004-11-30
Williams, Thomas (Department: 3683)
Machine element or mechanism
Control lever and linkage systems
Hand operated
C074S502600, C116S283000
Reexamination Certificate
active
06823758
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention is directed to bicycle brake devices and, more particularly, to a bicycle brake cable retainer, a bicycle brake lever assembly, a bicycle brake cable connector, and a bicycle brake system.
A bicycle brake system commonly comprises front and rear braking devices for applying braking forces to the front and rear wheels, front and rear brake levers mounted on the handlebar and designed to operate the front and rear braking devices, and brake cables secured to the front and rear braking devices and to the front and rear brake levers. Each brake cable comprises an inner wire that slides within an outer casing, wherein the inner wire is connected at one end to the brake lever and at the other end to the braking device. The outer casing ordinarily has one end mounted to a bracket for the brake lever and another end mounted to a bracket for the braking device.
The braking device comprises a braked member that rotates with the wheel and a braking member capable of coming into contact with the braked member. The braked member usually is the rim or hub of the wheel. The braking device for applying the braking force to a wheel rim may be a caliper brake or a cantilever brake, whereas the braking device for applying the braking force to a wheel hub may be an internal expanding brake in the form of a band brake, disk brake, roller brake, or the like. The braking device usually includes a play adjusting mechanism for adjusting the gap between the braked member and the braking member (that is, the play of the braking device) when the brake lever is not being operated. In a typical mechanism, an outer retainer for securing the outer casing is screwed into the braking device, the retention position of the outer casing is shifted in the axial direction of the cable by the rotation of the outer retainer, and the play is thus adjusted. This operation also sets the brake timing of the braking device.
A cable connector that allows the front and rear braking devices to be operated simultaneously with a single brake lever is disclosed in JP (Kokai) 4-2588, for example. In that device, the cable connector is disposed in the middle of the front and rear brake cables. The cable connector has a connection member for connecting exposed portions of the inner wires of the front and rear brake cables together and a bracket that allows the connection member to move. Outer retainers for securing the portions of the outer casings extending toward the braking devices and the portions of the outer casings extending toward the brake levers are disposed at opposite ends of the bracket. In a brake system having such a cable connector, both inner cables are pulled when a single brake lever is actuated, thus making it possible to obtain enhanced frame stability and stabilized braking characteristics. In addition, braking can be accomplished by operating either the left or right brake lever, thus making it possible to operate the brake levers with ease and to increase the service life of the braking devices by dispersing the braking force.
Since both inner cables are pulled when a single brake lever is actuated in such a system, the inner cable secured to the unactuated brake lever extends further from the outer casing, sags, and causes the brake lever to become loose. Furthermore, since the front and rear inner cables move simultaneously, the front and rear brake timing may vary considerably if the play is markedly different for each braking device. Since the inner cable connected to the rear braking device is longer than the one connected to the front braking device, it tends to stretch more during use. As a result, the rear brake timing gradually shifts away from the initial timing during use, thus making it necessary to readjust the amounts of play for the front and rear braking devices.
Optimally, the play of the front and rear braking devices should be kept the same or be limited to a specific difference. In a conventional braking device in which braking force is applied to the rim, the play can be kept constant by equalizing the gap between the brake shoe and the rim for the front and back wheels. In practice, however, this is difficult to do. In systems in which braking force is applied to the wheel hub, the braking member brought into contact with the drum is disposed inside the braking device, thus making it impossible to see the gap formed between the braking member and the hub. This makes it even more difficult to provide the front and back braking devices with the desired amounts of play.
SUMMARY OF THE INVENTION
The present invention is directed to an apparatus that can be used to simplify the adjustment of brake play and/or minimize looseness of the brake cable. In one embodiment of an invention directed to a cable connecting apparatus for a control cable having an inner wire that slides within an outer casing, the cable connecting apparatus includes a cable sleeve adapted to receive the outer casing of the control cable; a guide having a first end portion and a second end portion, wherein the guide supports the cable sleeve so that the cable sleeve moves toward the first end portion and the second end portion; and a biasing device for biasing the cable sleeve toward the second end portion of the guide. This allows slack to be taken up in a brake cable attached, for example, to a brake lever in a system wherein the front and rear cables are connected together for simultaneous operation.
In an embodiment of an invention directed to an indicating apparatus for a control cable having an inner wire that slides within an outer casing, the indicating apparatus includes a guide adapted to receive the outer casing of the control cable, an indicator adapted to be retained to the outer casing of the control cable, and a window for viewing the indicator. In another embodiment of an invention directed to an indicating apparatus for a control cable having an inner wire that slides within an outer casing, the indicating apparatus includes a guide adapted to receive the outer casing of the control cable, an indicator adapted to be retained to the outer casing of the control cable, and indicia supported by the guide for cooperating with the indicator to indicate a position of the outer casing of the control cable.
In an embodiment of an invention directed to a connecting apparatus for a first control cable having a first inner wire that slides within a first outer casing and a second outer casing and a second control cable having a second inner wire that slides within a third outer casing and a fourth outer casing, the apparatus includes a bracket including a first support for supporting the first outer casing, a second support for supporting the second outer casing, a third support for supporting the third outer casing, and a fourth support for supporting the fourth outer casing. A connecting member is provided for connecting a portion of the first inner wire located between the first outer casing and the second outer casing to a portion of the second inner wire disposed between the third outer casing and the fourth outer casing, wherein the connector moves together with the first inner wire and the second inner wire. A position confirmation means is provided that allows the position of at least one of the first outer casing, the second outer casing, the third outer casing and the fourth outer casing to be visually confirmed.
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Deland James A.
Shimano Inc.
Williams Thomas
LandOfFree
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