JPH0246472Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

This invention relates to a bicycle brake lever adjustment device, and more particularly, to a bicycle brake lever adjustment device that allows the distance between the handle grip and the brake lever to be adjusted to any distance depending on the rider's preference and hand size.

[Conventional technology]

Various devices have already been proposed in which the distance between the brake lever and the handle grip can be adjusted.For example, the device shown in Japanese Utility Model Publication No. 44-26572 has a rotatable structure on the front wall of the brake lever bracket. A bolt attached to the end of the outer wire is screwed into the nut held in the bracket, and the end of the bolt is brought into contact with an appropriate part of the brake lever rotatably supported within the bracket.
That is, the end of the bolt, which moves forward and backward by rotating the nut, functions as a stopper for defining the most open state of the brake lever. Retracting the bolt widens the distance between the brake lever and the handle grip, and conversely, moving the bolt forward narrows the distance between the brake lever and the handle grip.

[Problem that the invention attempts to solve]

However, in the brake lever adjustment mechanism with the above structure, there is no special means for fixing the nut, so as the brakes are repeatedly operated, the nut rotates and the brake lever adjusts to the set position. There was a problem that the opening of the valve would change over time. In other words, since the above bolt is integrally connected to the outer wire of the double wire as the brake operation wire, the axial force due to the brake operation is applied between the bolt and the nut, or the force placed on the brake body side The axial force exerted by the returned spring is constantly acting on the nut, and the nut tends to rotate inadvertently due to the influence of such force. This idea was devised under the circumstances mentioned above, and it is a new brake lever that does not change the opening degree of the brake lever once it has been adjusted, and also allows for easier adjustment work. The object of the invention is to provide an adjustment device for the invention.

[Means to solve the problem]

In order to solve the above problem, the present invention takes the following technical measures. In other words, the present invention provides a bicycle brake lever device in which the base of the brake lever is rotatably supported on a support shaft provided across the left and right walls of the brake bracket. A stopper shaft includes a camshaft, a disk-shaped head formed at one end of the eccentric camshaft, and a small diameter tip portion formed concentrically with the head at the other end of the eccentric camshaft. , is rotatably supported in a through hole penetrating the left and right walls parallel to the spindle of the brake lever and via a step locking mechanism, and the step lock mechanism is provided on the back surface of the head. elastically engaging and disengaging the formed radially extending protrusions at equal intervals, the equally spaced radial grooves formed on the outer surface of the wall portion corresponding to the protrusions, and the protrusions and the grooves; and elastic pressing means capable of locking the stopper shaft at a desired rotational position, so that an appropriate portion of the brake lever comes into contact with the circumferential surface of the eccentric cam shaft portion, thereby defining an open state. Characterized by what has been done.

[Effect]

When the stopper shaft is rotated against the elastic pressing force exerted by the elastic pressing means, the protrusion and the groove repeatedly engage and disengage elastically, and are locked with moderation at each predetermined angle. be done. As a result, the contact point of the eccentric camshaft portion with respect to the brake lever changes in the radial direction of the stopper shaft. That is, the brake lever rotates as a result of the eccentric camshaft, and its opening relative to the handle grip when it is fully opened changes.

【effect】

As described above, with the brake lever adjusting device of the present invention, the opening degree of the brake lever relative to the handle grip can be adjusted as desired by the simple operation of rotating the stopper shaft. Also,
Since the stopper shaft in the brake lever adjustment device of the present invention is independent of the brake operating system such as the brake lever or operating wire, it is completely unaffected by the brake operating force unlike the conventional example, and therefore can be easily operated. By simply holding the rotational position of the stopper shaft at a predetermined position by the stepwise locking means, the stopper shaft will not rotate inadvertently and the opening degree of the brake lever will not be distorted. That is, the stepwise locking means does not hold the stopper shaft by frictional force, but includes radially extending protrusions at equal intervals formed on the back surface of the head of the stopper shaft, and a wall corresponding to the protrusions. With a concave groove formed on the outer surface,
Since the rotational position of the stopper shaft is reliably held through engagement, even if an impact force is applied to the eccentric cam portion of the stopper shaft, the rotational position will not be disturbed and the brake lever will not open. The temperature can be maintained with high precision.

[Explanation of Examples]

Hereinafter, embodiments of the bicycle brake lever adjusting device of the present invention will be described in detail with reference to the drawings. The brake bracket 3 has a box-like shape with an open rear part, and has an annular clamp portion 3a formed at its base that holds the grip 2 of the handlebar 1.
By tightening and holding the nearby parts,
Mounted against the handlebar. A support shaft 6 is supported across the left and right walls 4 and 5 sandwiching the box space, and with respect to this support shaft 6,
A substantially L-shaped brake lever 7 is rotatably supported by fitting a boss portion 8 formed at its base. On the other hand, a screw hole 10 is bored in the thick wall portion 9 formed on the front wall of the tip end of the brake bracket 3, and the screw hole 10 has an axial through hole 11, and one end of the outer wire W1 is inserted into the screw hole 10. The holding bolt 12 is screwed in. The inner wire W2 extending from one end of the outer wire W1 is attached to the bolt 12.
The nipple end 13 is introduced into the box space of the bracket 3 through the through hole 11 of the brake lever 7, and the nipple end 13 is connected to the L-shaped bent portion of the brake lever 7. By adjusting the amount by which the bolt 12 is screwed into the screw hole 10, the actual length of the outer wire W1 changes, and thereby the effectiveness of the brake can be adjusted.
The lock nut 14 screwed into the outer wire W1 is applied to the surface of the bracket 3 to apply a force in the pulling direction to the bolt 12, so that the actual length of the outer wire W1 that has already been set does not change due to the bolt 12 being inadvertently rotated. There is. At a portion located in front of the front edge 7a of the brake lever 7 in the box space, a stopper shaft 16 is provided with an eccentric camshaft 15 that can come into contact with the front edge 7a. It is rotatably supported so as to pass. Details of the stopper shaft 16 and its support structure are shown in the drawings from FIG. 3 onwards. As shown in FIG. 4, the stopper shaft 16 has a disk-shaped head 17, a large-diameter portion 18 under the neck of the head, and a large-diameter portion 18 as shown in FIG. The eccentric camshaft 15 includes an eccentric camshaft portion 15 that is eccentric, and a small diameter tip portion 19 that protrudes from the eccentric camshaft 15 concentrically with the large diameter portion 18 . On the other hand, the left wall 4 of the bracket 3 is provided with a counterbore 20 for accommodating the head 17 and a through hole 21 for rotatably accommodating the large diameter section 18, and the right wall is provided with a counterbore 20 for accommodating the large diameter section 18. 22
A through hole 23 concentric with the through hole 21 in the left wall, which rotatably accommodates the small diameter portion 19 at the tip end,
Each can be opened. When the stopper shaft 16 is inserted from the left side of the bracket 3 so that the small diameter portion 19 at the tip is accommodated in the through hole 23 on the right wall, and the large diameter portion 18 under the neck is accommodated in the through hole 21 on the left wall. A rotatable eccentric camshaft portion 15 is disposed between the left and right walls 4 and 5 within the box space. Further, the stopper shaft 16 has protrusions 24 extending radially at equal intervals as shown in FIGS. 5 and 6 on the back surface 17a of the disc-shaped head 17. Equally spaced radial grooves 25 that can engage with the projections 24 are formed on the bottom surface 20a of the counterbore portion 20 of the left wall 4 where the back surface should come into contact, and the back surface 17a of the disk-shaped head 17 is By elastically pressing against the bottom surface 20a of the counterbore portion 20, it is held at a predetermined rotational position. That is, with the above configuration, the stopper shaft 16 can be moved according to the spacing between the protrusion and the groove.
It is held in stepwise rotational positions. Bottom surface 20 of counterbore portion 20 on back surface 17a of disk-shaped head 17
The elastic pressing means that applies an elastic pressing force to the counterbore 22 of the right wall 5 is a spring washer between the push nut 26 fitted in the small diameter portion 19 of the tip protruding from the counterbore 22 of the right wall 5 and the bottom surface 22a of the counterbore 22. 27 to elastically pull the entire stopper shaft 16 to the right in FIG.
As a result, when a rotational force of more than a predetermined value is applied to the stopper shaft 16, the projection 24 and the groove 25 repeatedly engage and disengage elastically, and are locked with a sense of moderation at every predetermined angle. This makes it possible to reliably hold the stopper shaft 16 at a desired rotational position. As shown in FIG. 3, in this example, the stopper shaft 1
The eccentric shaft portion 15 is attached to the surface 17b of the head 17 of 6.
A decorative pattern 28 is provided to indicate the eccentric direction of the
In addition, a concave groove 29 is provided so that the stopper shaft 16 can be easily turned using a piece of plate such as a coin.
is formed. This groove may be replaced with any engagement means that can be engaged by a driver or a hex wrench. When the stopper shaft 16 is rotated, the point of contact of the eccentric shaft portion 15 with the front edge 7a of the brake lever 7 is displaced in the radial direction with respect to the rotation axis of the stopper shaft 16, so that the solid line in FIG. The opening degree of the brake lever 7 is varied by varying the distance between the protrusion 24 and the groove 25 from the widest distance to the handle grip 2 as shown to the narrowest distance to the handle grip 2 as shown by the virtual line in FIG. It can be adjusted accordingly. Further, by narrowing the distance between the upper protrusion 24 and the groove 25, the opening degree of the brake lever 7 can be finely adjusted. In order to expand the adjustment range of the brake lever, the amount of eccentricity of the eccentric shaft portion 15 may be increased. Note that the eccentric shaft portion 15 does not need to be cylindrical, and may have a substantially triangular shaft shape that is substantially eccentric with respect to the rotation axis, as shown in FIG. In this case, the first surface 15 closest to the rotation center
a, selectively move the farthest third surface 15c and the intermediate second surface 15b to the front edge 7a of the brake lever 7;
The opening degree of the brake lever 7 can be adjusted in three steps by bringing it into contact with the brake lever 7. As explained above, in the bicycle brake lever adjustment device of the present invention, by simply rotating the stopper shaft 16 located in front of the front edge 7a of the brake lever 7, the opening of the brake lever relative to the handle grip 2 can be adjusted very easily. can be adjusted to the desired opening degree. Further, the stepwise locking means of the present invention does not hold the stopper shaft 16 by frictional force, but by using protrusions 24 extending radially at equal intervals formed on the back surface of the head 17 of the stopper shaft 16. , with a groove 25 formed on the bottom surface 20a of the counterbore portion 20 corresponding to the protrusion 24,
Since the rotational position of the stopper shaft 16 is reliably held through elastic engagement, even if an impact force or the like is applied to the eccentric cam portion 15 of the stopper shaft 16, the rotational position will not be distorted. Therefore, the opening degree of the brake lever 7 can be maintained with high accuracy. Of course, the scope of the invention is not limited to the embodiments described above. In particular, the shapes of the projections 24 and grooves 25 are not limited to the embodiments.
Further, the spring washer 27 constituting the elastic pressing means can be replaced with a compression coil spring or elastic rubber.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view of a brake lever to which the bicycle brake lever adjustment device of the present invention is applied, Fig. 2 is a cross-sectional view showing an example of a brake bracket mounting structure, and Fig. 3 is a cross-sectional view of the head of the stopper shaft. Detailed view, Figure 4 is an exploded view of the stopper shaft mounting structure,
Fig. 5 is a back view of the stopper shaft, Fig. 6 is a sectional view taken along the - line of Fig. 5, and Fig. 7 is a - of Fig. 1.
FIG. 8 is a partially sectional back view of another embodiment of the stopper shaft. 3... Brake bracket, 4... Left wall, 5... Right wall, 6... Support shaft, 7... Brake lever, 15... Eccentric cam shaft portion, 16... Stopper shaft.

Claims (1)

[Scope of Claim for Utility Model Registration] In a bicycle brake lever device in which the base of the brake lever is rotatably supported on a support shaft provided across the left and right walls of a brake bracket, with respect to the center of rotation. The eccentric camshaft includes an eccentric camshaft, a disc-shaped head formed at one end of the eccentric camshaft, and a small diameter tip portion formed concentrically with the head at the other end of the eccentric camshaft. A stopper shaft is rotatably supported in a through hole penetrating the left and right walls in parallel with the spindle of the brake lever and via a stepwise locking mechanism, and the stepwise locking mechanism radially extending equally spaced protrusions formed on the back surface of the wall portion, and equally spaced radial grooves formed on the outer surface of the wall portion corresponding to the protrusions, and the protrusions and the grooves elastically engaging. and elastic pressing means capable of disengaging the stopper shaft and locking the stopper shaft at a desired rotational position, the brake lever being in an open state with an appropriate portion of the brake lever in contact with the peripheral surface of the eccentric cam shaft portion. An adjustment device for a bicycle brake lever, characterized in that the adjustment device is configured to do so.