. . .. . . . ...... ApplICation ... . . ..... January, 26, 2013 0" K ING, BRAM' 4 FO'R t. FRONT 'EEL F BICYCLE j':'1Vn.:.-; I A for a afir An innovative invention ae by Francisco Javier Gonzalez ...... . ... iC ig- A. All ....... ... ij, .. . .. . ....... .... ........ 1 z .. ... . .... ..... . .... .. . ... M zP im M AM 44 1W Anti-locking Brake System for Front Wheel of Bicycles By Francisco Javier Gonzalez. Last revision of document on January the 26 of 2013 Purpose This invention improves the safeness of the riding experience especially in heavy traffic where unexpected circumstances can require a sudden stop of the bicycle. It is best suited for road pushbikes and for mountain bikes. The purpose of this invention is to prevent the front wheel of a bicycle from locking when sudden pressure is applied to the hand lever of the front wheel brake by the rider. Preventing the locking of the front wheel, will help the rider avoid loss of control and reduce the risk of falling and resulting injuries. Description The system regulates the braking of the front wheel based on the amount of pressure exercised on the saddle and on the hand lever. Pressure on the saddle is exercised by the mass of the rider's body. To detect such pressure, the saddle has a mechanism that, when the rider is seated on it, actuates a lever that regulates the tightness of the cable of the braking arms half way for the front wheel. The braking system can be fully engaged when the rider also presses the braking hand lever while seated on the saddle (see fig. 1 and 2 and prototype pictures 1 to 4). When there is a sudden deceleration due to a hard braking of the bicycle, the momentum of the body mass which is bigger than that of the bicycle, tends to separate the rider from the saddle frontwards and upwards. It is at this moment when there is less pressure over the saddle that the lever releases the tension on the brake cable thus releasing also pressure on the braking arms of the front wheel preventing it from locking.
Anti-locking Brake System for Front Wheel of Bicycles By Francisco Javier Gonzalez. Last revision of document on January the 26 of 2013 Applications This system can be ideally applied on Linear-pull brakes or direct-pull brakes, commonly referred to by Shimano's trademark as V-brakes and also on Single pivot side-pull calliper brakes. In either case, a small adaptation screw has to be done on one arm to allow for the cable going to the saddle lever, as can be seen on the prototype pictures 5 to 7 (highlighted with a yellow circle in Picture 7) and figure num. 3. In my prototype I added a spring for added strength to pull the saddle lever. The system can be applied following the same principles on mechanical (cable-actuated) disk brakes. It can also be applied on hydraulic actuated disk brakes provided the disc brakes have their pads actuated from both sides of the calliper (double cylinder). In that instance, similar to the hand lever which actuates a piston in a cylinder lined to one of the cylinders on one side of the calliper, the lever under the saddle would also actuate a piston in a hydraulic cylinder lined to the other cylinder on the brake calliper. 2 1 Anti-locking Brake System for Front Wheel of Bicycles By Francisco Javier Gonzalez. Last revision of document on January the 26 of 2013 SCHEMATIC DRAWINGS Folowing I have provided two schematic drawings picturing the basic concept of ussing the saddle as the innovative part of my brake system. Figure 1 This position with the weight pressing down the saddle, pulls the cable from the front brake. Figure 1 This drawing picturing the basic concept of using the saddle as the innovative part of my brake system. Note: The arrows show the direction of forces. Figure 2 This position without any weight pressing down the saddle, the spring from the brake pulls the cable and the lever rises the saddle. Figure 2 This drawing picturing the basic concept of using the saddle as the innovative part of my brake system. This position without any weight pressing down the saddle, the spring from the brake pulls the cable and the lever rises the saddle. Note: The arrows show the direction of forces. 3 a Anti-locking Brake System for Front Wheel of Bicycles By Francisco Javier Gonzalez. Last revision of document on January the 26 of 2013 Figure 3 Description from the drawing: This drawing pictures the adaptive screw, to hold the cable sleeve and to allow the brake cable to run through. b) M6 thread c) 5mm not through hole to accommodate and hold the sleeve d) 2mm through hole for cable Figure 4 Schematic drawing of the anti-locking brake system for front wheel of bicycles. When the cable is pulled from the saddle L shape lever and from the hand lever, the pulling pressure closes the gap between the brake levers. Descriptions from the drawing: A- Pulling pressure on Brake hand lever B- Downward pressure on Saddle C- Direction of Force a) Brake cable b) Tire c) Brake Pad d) Rim e) Linear pull brake lever f) Cable sleeve g) Saddle frame h) Cable sleeve goes into the tube that holds the saddle frame i) Saddle j) Hinge flange from saddle base k) Hinge flange from saddle frame I) L shape lever m) Cable locking pivoting bush 41 Anti-locking Brake System for Front Wheel of Bicycles By Francisco Javier Gonzalez. Last revision of document on January the 26 of 2013 n) Brake cable o) Pivoting hinge Note: Drawing not at scale Figure 5 Detail of L shape Lever with its pivoting bush to lock the brake cable Description from the drawing: a) Pivoting hole b) M3 grub screw locks the cable in the bush c) Cable Locking Pivoting Bush d) Hole where the cable passes through Drawing not at scale 5 1 Anti-locking Brake System for Front Wheel of Bicycles - By Francisco Javier Gonzalez. Last revision of document on January the 26 of 2013 PROTOTYPE PICTURES The following pictures show the prototipe for trials that I have built and tested. The following two pictures shows the prototype saddle with no weight and the lever is not tightening the brake cable Picture 1 Picture 2 Close up of the same condition view Pictures 3 and 4 show the prototype saddle with weight and the lever is tightening the brake cable Picture 3 Picture 4 Close up of the same condition view Picture 5 shows the position of the linear pull brake levers (V-Brake Shimano's TM) when no pressure is applied on the hand brake lever and the rider is of the saddle Picture 6 shows the "fully" tighten position of the linear pull front brake levers when both the hand brake lever and the saddle lever are pulling the cable Picture 7 shows the "half" tighten position of the linear pull front brake levers when either the hand brake lever or the saddle lever is pulling the cable As I mentioned before, in the pictures can be seen the added helical spring to add extra tension to pull the saddle up. Below, in figure 3, is the little adaptation screw (M6 in the case of my prototype with its nut) with a hole for the cable and its sleeve that I needed to do in my existing brake in order to allow for the cable to run free trough both levers of the brake. There will be no need for this adaptation in case of new designed brake levers where both side levers will have the two dimensional hole to accommodate the cable sleeve and to let go through the brake cable. 6 1