Patent Application
20150075920
1. Technical Field of the Invention
The present embodiment is related in general to systems for reducing the braking power of a two wheel vehicle, and in particular to a system for the reduction of the braking power by releasing brake cable tension and thereby preventing over the handlebar accidents due to excessive brake force.
2. Description of the Related Art
Braking systems have improved as materials and engineering know-how have evolved. All brakes, regardless of the mechanism, share a common thing that they increase the amount of brake friction allowing the rider to slow down or stop. Most brake problems result from excessive friction or poor installation of the cables or poor quality brakes. Traditional cantilever brakes used two cables, a main cable running down the centerline of the bike, and a second, transverse cable connecting the cantilever units on each side of the wheel. The main cable would pull upward on the middle of the transverse cable, causing the cantilever units to rotate inward. The operation of like brake systems such as applying the front brake only with too much pressure can lock up the front wheel and cause a forward rollover accident.
Conventional brake levers used with direct-pull cantilevers will not pull enough cable to stop in wet conditions without bottoming out against the handlebars. In dry conditions, they either won't work, or will grab too suddenly. The bicycle brake has been redesigned over the years to provide the rider with increased braking power. However, this increased braking power may be difficult for the inexperienced rider to control. Specifically, a bicycle brake with a very large braking power can possibly cause the bicycle wheel to lock up. This may cause the bicycle to skid for the inexperienced rider. With any braking system, failure to properly adjust, maintain, and use your brakes may result in a loss of control and injury.
One of the existing systems for reducing braking power describes a braking power modulator for a bicycle brake device. More specifically, the present invention relates to an adjustable braking power modulator, which can be mounted midway along a brake cable of a bicycle brake device to modulate the braking power corresponding to a stroke of an inner wire of the brake cable. The adjustable braking power modulator provides different braking powers to meet the needs of different riders or different road conditions. However, this system cannot be operated in all weather conditions. The system is not cost effective or convenient for use.
Another existing system for reducing braking power discloses a cable connecting apparatus that includes a cable sleeve adapted to receive the outer casing of a control cable; a guide having a first end portion and a second end portion for movably supporting the cable sleeve; and a biasing device for biasing the cable sleeve toward the second end portion of the guide. In another device, a connecting member is provided for connecting a portion of a first inner wire located between a first outer casing and a second outer casing to a portion of a second inner wire disposed between a third outer casing and a fourth outer casing, wherein the connector moves together with the first inner wire and the second inner wire. A position confirmation means 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. The system does not provide simple and reliable design.
Another existing system provides a device for a two wheeled vehicle with two independent cable operated brake systems consisting of two pivoting levers connecting the two cables operating the brake calipers via cables enclosed in casings from the hand lever to the calipers, one operating the front brake and one operating the rear brake. Regardless of which or both hand levers are applied first, the rear brake will be actuated before and with more force that to the front brake through the offset pivot point of the two levers, the fulcrum action will alter the length of the casing relative to the cable length of one brake and by tension transfer the differences of casing length to cable length on the opposite side and apply the brakes rear first with more force than front brake. However, this system requires no adjustment or maintenance over time.
Various other systems exist that reduce the brake power of a two wheel vehicle. One such system is a braking power modulator for a bicycle brake device. More specifically, the present invention relates to an adjustable braking power modulator, which can be mounted midway along a brake cable of a bicycle brake device to modulate a braking power corresponding to a stroke of an inner wire of the brake cable. The adjustable braking power modulator provides different braking powers to meet the needs of different riders or different road conditions. Various other systems use a spring to limit the force that a brake lever can transmit to a brake caliper. This is done by placing a spring on one end of a brake cable at either the lever end or the caliper end. When the rider moves the brake lever, some of the force is used to move the spring, not the brake cable, thus limiting the amount of force the brake cable transmits to the brake caliper. The disadvantage of these systems is that the braking power is limited all the time so that the performance of the braking system is limited. Thus the safety of the braking system is reduced.
Based on the foregoing, there is a need for a system that would prevent over the handlebar accidents when the front brake is applied too rapidly or aggressively. Such a needed system would reset automatically. Such a needed system would provide a simple and reliable design. Further, the system could be operated in all weather conditions. The system would require no adjustment or maintenance over time. Such a system would be installed in all types of bicycles and anywhere in a bicycle brake system. Finally, the system would be cost effective and convenient for use. The present invention overcomes prior art shortcomings by accomplishing these critical objectives.
To minimize the limitations found in the prior art, and to minimize other limitations that will be apparent upon the reading of the specifications, the preferred embodiment of the present invention provides a device for brake power reduction of two-wheel vehicles.
The present embodiment is a brake release system. The brake release system comprises a brake cable, brake cable housing held by a piston. The piston is held in the latched position by the hardened steel ball. The hardened steel ball is pushed into the groove in the piston and held in place by a compression spring. The amount of spring force on the hardened steel ball and the amount of the hardened steel ball that is engaged in the groove determines the release force. The brake cable housing is held in place by the piston. When the brake cable is pulled quickly and the longitudinal force on the piston reaches the release force, the piston slides down the bore in the brake release housing. This action partially releases the brakes. A plurality of O-rings prevent water and debris from entering the housing. Pluralities of washers are available inside the cap. A compression spring is also seen inside the cap. The plurality of washers adjust the force the spring pushes on the hardened steel ball. The housing is made of a wall tubing and is also available in the brake release system. A changeable end cap is connected to a brake release housing. A noodle for V-brakes is present in the brake release system and is connected to the changeable end cap.
The brake release system works by extending the length of the brake cable connected between the brake lever and the brake caliper on the front brake of a bicycle. The method of extending the brake cable is to release the brake cable housing. The brake release system routes the brake cable through the center of the brake release system. This eliminated any side loads or friction on the brake cable during normal braking operation. The brake will feel the same to the rider during normal operation even with the brake release system installed on the bicycle.
A piston is used to hold the brake cable housing. A hardened steel ball is used to keep the piston from moving and releasing the brake cable. A spring is used to push the ball against the piston. The amount of engagement of the ball with the piston and the spring force determine the release force. When the brake is applied smoothly, the ball and piston can resist approximately two and a half times the brake lever load compared to when the rider aggressively applies the brake lever with the resulting shock load on the ball and piston. When the brake is applied smoothly, about 90% of the braking power can be achieved. When the brake is applied aggressively and rapidly, the brake releases at about 50% of its braking power.
The brake release system is a safety device for bicycles with cable actuated brakes. The brake release system prevents over the handlebar accidents on bicycles that result from applying the front brake too rapidly and aggressively. The front brake works normally with the brake release system when the brake lever is squeezed smoothly. The front brake applies about one third of its braking power after the brake release system releases the brake. The brake automatically resets when the brake lever is released.
The brake release system takes one half second from brake release to brake reset. The brake release system is a simple and reliable mechanical design. It has high reliability with no moving parts during normal braking. The brake release system has an enclosed design and can operate for years in all weather conditions. No adjustments or maintenance is needed over time. It is easy to confirm that the brake release system is functioning by rapidly squeezing the brake lever and seeing that the front brake is partially released. The brake release system works with all types of bicycles that have cable actuated brake including rim and disc brakes. The brake release system can be installed anywhere in the bicycle brake system including at the brake lever, the brake caliper or anywhere along the brake cable route.
The present embodiment is easy to install on new bicycles and can be retrofitted easily to existing bikes. The brake release system is cost efficient. Other features and advantages of the present invention will become apparent from the following more detailed description, taken in conjunction with the accompanying drawings, which illustrate, by way of example, the principles of the invention.
These and other advantages and features of the present invention are described with specificity so as to make the present invention understandable to one of ordinary skill in the art.
Elements in the figures have not necessarily been drawn to scale in order to enhance their clarity and improve understanding of these various elements and embodiments of the invention. Furthermore, elements that are known to be common and well understood to those in the industry are not depicted in order to provide a clear view of the various embodiments of the invention, thus the drawings are generalized in form in the interest of clarity and conciseness.
In the following discussion that addresses a number of embodiments and applications of the present invention, reference is made to the accompanying drawings that form a part hereof, and in which is shown by way of illustration specific embodiments in which the invention may be practiced. It is to be understood that other embodiments may be utilized and changes may be made without departing from the scope of the present invention.
The following describes example embodiments in which the present invention may be practiced. This invention, however, may be embodied in many different ways, and the description provided herein should not be construed as limiting in any way. Among other things, the following invention may be embodied as methods or devices. As such, the present invention may take the form of an entirely hardware embodiment, or an embodiment combining software and hardware aspects such as when the brake release system is used in conjunction with a computer to form an antiskid system. The following detailed descriptions should not be taken in a limiting sense.
The brake release system 100 comprises the brake cable 102, a brake cable housing 104 held by piston 110 (not shown). Piston 110 is held in the latched position by the hardened steel ball 112 (not shown). The hardened steel ball 112 is pushed into the groove in the piston 110 and held in place by a compression spring 118 (not shown). Compression spring 118 is used to push the hardened steel ball 112 against the piston 110. The amount of spring force on the hardened steel ball 112 and the amount of the hardened steel ball 112 that is engaged in the groove determines the release force. The brake cable housing 104 is held in place by the piston 110. When the brake cable 102 is pulled quickly and the longitudinal force on the piston 110 reaches the release force, the piston 110 slides down the bore in the housing 120. This action partially releases the brakes. An O-ring (not shown) keeps water and debris from entering housing 120. Pluralities of washers (not shown) are available inside the cap 116. When the brake release system partially releases the brake, compression spring 132 pushes piston 110 back to the latched position when the brake lever is released. This action automatically resets the brake release system.
The brake release system 100 comprises the brake cable 102, a brake cable housing 104 held by a piston 110 (not shown). The piston is held in the latched position by the hardened steel ball 112 (not shown). The hardened steel ball 112 is pushed into the groove in the piston and held in place by a compression spring 118 (not shown). Compression spring 118 is used to push the hardened steel ball 112 against the piston 110. The amount of spring force on the hardened steel ball 112 and the amount of the hardened steel ball 112 that is engaged in the groove determines the release force. The brake cable housing 104 is held in place by piston 110. When the brake cable 102 is pulled quickly and the longitudinal force on the piston 110 reaches the release force, the piston 110 slides down the bore in the housing 120. This action partially releases the brakes. An O-ring (not shown) keeps water and debris from entering housing 120. Inside the cap 116 shown in
The brake release system 100 comprises the brake cable 102, a brake cable housing 104 held by a piston 110 (not shown). The piston is held in the latched position by the hardened steel ball 112 (not shown). The hardened steel ball 112 is pushed into the groove in the piston and held in place by compression spring 118 (not shown). The compression spring is used to push the hardened steel ball 112 against the piston 110. The amount of spring force on the hardened steel ball 112 and the amount of the hardened steel ball 112 that is engaged in the groove of piston 110 determines the release force. The brake cable housing 104 is held in place by the piston 110. When the brake cable 102 is pulled quickly by brake lever 128 and the longitudinal force on the piston 110 reaches the release force, the piston 110 slides down the bore in the housing 120. This action partially releases the brakes. An O-ring (not shown) keeps water and debris from entering the brake release housing 120. Inside the cap 116 shown in
The brake release system 100 has no moving parts during normal braking thus giving it high reliability. There are no batteries to maintain and no adjustments to be made. The front brake operates normally when the brake is applied smoothly. When the front brake is applied abruptly and aggressively in a panic stop situation, the front brake is released at approximately half of its maximum braking power. This prevents the rider from decelerating too quickly and possibly going over the handlebar. When the brake is released, the front brake is still operating with approximately 33% of the braking power being applied. The front brake automatically resets when the brake lever 128 is released by the rider. The brake release system 100 is also beneficial to any two wheel vehicles with cable actuated brakes that are prone to over the handlebar accidents. This includes electric bikes, electric scooters and small motor bikes. The brake release system 100 can also be used to limit the force being applied to any device using a flexible cable in a flexible housing.
The brake release system 100 works by extending the length of the brake cable 102 connected between the brake lever 128 and the brake caliper (not shown) on the front brake of a bicycle. The method of extending the brake cable 102 is to release the brake cable housing 104. The brake release system 100 routes the brake cable 102 through the center of the brake release system 100. This eliminated any side loads or friction on the brake cable 102 during normal braking operation. The brake will feel the same to the rider during normal operation when the brake release system 100 is installed on the bicycle.
Piston 100 (not shown) is used to hold the brake cable housing 104. A hardened steel ball 112 is used to keep the piston from moving and releasing the brake cable 102. A spring 118 is used to push the hardened steel ball 112 against the piston. The amount of engagement of the hardened steel ball 112 with the piston and the spring force determine the release force. When the brake is applied smoothly, the ball 112 and piston can resist approximately two and a half times the brake lever 128 load compared to when the rider aggressively applies the brake lever 128 with the resulting shock load on the ball 112 and piston. When the brake is applied smoothly, about 90% of the braking power can be achieved. When the brake is applied aggressively and rapidly, the brake release at about 50% of its braking power.
The brake release system 100 can be located anywhere along the path of the brake cable 102. It can be connected to the brake lever housing 130, the brake caliper (not shown) or anywhere along the brake cable 102 route. There is no cutting of the brake cable 102 or brake cable housing 104. It is easy to confirm that the brake release system 100 is operational by simply squeezing the brake lever 128 quickly to see that the front brake releases. The brake release system 100 is a simple design and is cost efficient.
The foregoing description of the preferred embodiment of the present invention has been presented for the purpose of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form disclosed. Many modifications and variations are possible in light of the above teachings. It is intended that the scope of the present invention not be limited by this detailed description, but by the claims and the equivalents to the claims appended hereto.
