Brakes – Vehicle – Velocipede
Patent
1983-04-29
1985-11-12
Reger, Duane A.
Brakes
Vehicle
Velocipede
188 2422, B62L 112
Patent
active
045522510
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a cycle wheel rim brake with central traction, containing two two-armed brake levers which are pivotably mounted on a mounting plate, are held under spring tension and have actuating arms which cross over each other, and also containing a central traction cable, a cable carrier provided with a clamping screw to clamp the traction cable onto the cable carrier at an adjustable effective traction length, further containing a connection between the cable carrier and the free ends of the brake lever actuating arms.
In a known construction of a rim brake with central traction for a bicycle (German Offenlegungsschrift No. 26 39 008) the lower end of the traction cable is fixed on the free end of one brake lever actuating arm at an adjustable effective traction length. One end of a rigid traction member is articulated on the free end of the other brake lever actuating arm, the other end of the traction member being constructed as a gripping device to enclose the traction cable. The end of the traction member connected to the free end of one brake lever actuating arm is constructed with a longitudinal slot and has a cam plate with means for adjusting the brake lever arms bearing the brake shoes relative to the rim of a bicycle wheel. Apart from this costly construction for connecting the traction cable to both brake lever actuating arms this known rim brake also has the disadvantage that it always has a tendency to pull asymmetrically.
In a rim brake with central traction of the type described in the introduction which is known in the art the lower end of the central traction cable is clamped on the cable carrier with the aid of the clamping screw so that its effective traction length is adjustable. The lower part of the cable carrier is constructed in the form of a hook on which a short connecting cable which connects the free ends of the two brake lever actuating arms is loosely suspended. Here, however, mounting proves awkward in so far as the cable carrier has to be gripped with one hand whilst loosening or tightening the clamping screw if the effective traction cable length is to be adjusted.
The object of the invention, therefore, is to improve a rim brake with central traction of the type described in the introduction in such a way as to simplify mounting and especially to simplify adjustment of the traction cable on the cable carrier.
This object is achieved according to the invention in that the connection between the cable carrier and the free ends of the brake lever actuating arms is formed by two pull rods of equal length which are pivotably connected at corresponding ends to the cable carrier and at their opposite ends to the free ends of the brake lever actuating arms and have a stop surface which comes to rest on a matching surface on the cable carrier when the brake is released.
In the rim brake with central traction according to the invention the connection between the free ends of the brake lever actuating arms is formed by the two pull rods and this results on the one hand in a comparatively rigid and particularly stable connection which nevertheless provides the freedom of movement which is necessary for a rim brake with central traction in order to pull the two brake actuating arms; on the other hand the construction, arrangement and connection of these two pull rods with the cable carrier provides a rotationally fixed retaining means for the cable carrier so that the clamping screws on the cable carrier can be easily loosened and tightened and at the same time the traction cable can be adjusted and mounted in the desired manner with one hand.
Further details of the invention are set out in the subordinate claims and in the following description of an embodiment which is illustrated in the drawings, in which:
FIG. 1 shows a front view of the rim brake with central traction according to the invention;
FIG. 2 shows a rear view of the rim brake with central traction according to FIG. 1 in which the rim brake is in the open position;
FIG. 3 shows a partial view (section III
REFERENCES:
LeCycle, vol. 17, No. 29, Oct. 1962 (Paris, FR) p. 21.
Oberley Alvin
Reger Duane A.
Weinmann AG
LandOfFree
Cycle wheel rim brake construction does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Cycle wheel rim brake construction, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cycle wheel rim brake construction will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1875570