JPS5918957Y2 - bicycle rim brake - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bicycle rim brake, particularly a front wheel rim brake.

Conventionally, many caliper brakes have been used as brakes for front wheels, and the upper part of a pair of arc-shaped brake bodies is connected to a common fulcrum shaft at the upper end of the front fork above the wheel, that is, at the center of the fork crown. The brake shoe provided at the lower end of the brake body was opposed to the side of the wheel rim, and the output end of the brake wire connected to the brake lever was connected to the other free end of the brake body. When the brake wire is pulled by the brake lever, the upper free ends of the brake body are brought closer to each other by the action of the outer cable that is fitted around the wire, and the brake shoes are brought into contact with the side of the rim. Pressed.

With this conventional model, the entire brake component parts such as the brake body and brake wire are exposed to the outside, making it unsightly.
Moreover, these act as air resistance when driving at high speeds.

Furthermore, in the above caliper brake, the return force of the brake body is applied by a return spring attached directly to the brake body, and this return spring is attached via a common fulcrum shaft of the brake body. Since it is composed of a single spring, the gaps between each brake shoe and the rim are often not constant, and one gap is often larger than the other, resulting in unbalanced braking force.

Therefore, this type of brake requires balance adjustment.

In order to reduce the above-mentioned air resistance and make the above-mentioned balance adjustment unnecessary, the present invention biases a vertically moving body driven by a wire in the return direction with a spring and inserts it into the Hawk stem, The object of the present invention is to enable a pair of brake bodies attached to each fork leg to move positively with the movable body and return to normal position by the biasing force of the spring.

The technical means of the present invention for solving the above problems includes a pair of brake bodies pivotally supported at the upper part of each of the hawk legs of a hawk so as to be able to swing in opposite directions, and a pair of brake bodies provided at both ends of each of the brake bodies. A pair of arms connecting the brake shoe mounting portion and the shaft support, a brake shoe provided at the free end of the brake body facing the side surface of the rim of the wheel, and a lower end portion of the horn stem are assembled so as to be able to rise and fall freely. an elevating body; a spring that is directly or indirectly interposed between the elevating body and the Hawk stem and applies a downward biasing force to the elevating body; and a spring that connects the elevating body and the brake body and is located in a symmetrical position with respect to each other; It consists of a pair of rods provided and a brake wire that is connected to the elevating body and passes through a pulling rod that is inserted into the bundle post, and the brake wire is moved forward and backward by a brake lever.

The above technical means of the present invention operates as follows.

Most of the components that make up the brake device, including a part of the wire that transmits the action force of the bundle lever, a spring that returns the brake body, and an elevating body that serves as the brake body drive device, are built into the horn stem. That will happen.

Next, to explain the operation, when the brake lever is operated, the brake wire is pulled up and the elevating body is lifted against the biasing force of the spring, and the rod connected to this elevating body swings the brake body inward. let

This brings the brake shoe into pressure contact with the side surface of the knob.

Conversely, when the operating force of the brake lever is released, the elevating body is pushed down by the spring, and the brake body connected to the rod is returned to its initial position.

The present invention has the following unique effects.

Since most parts of the brake system are inserted into the horn stem or bundle post, air resistance during high speed driving is reduced.

Next, each brake body is provided so as to move symmetrically with respect to the elevating body, and a spring is applied to the elevating body, and the brake arm returns to the initial position by the return force of the elevating body caused by this spring. Because it is something that is forced,
The force applied by this spring is equally distributed to the brake arm, and there is no problem (one-sided effect) due to unbalanced force of the spring as in conventional caliper brakes.
This eliminates the inconvenience of balance adjustment.

In addition, the brake body is smaller than conventional ones, the outer cable of the brake wire is fewer than conventional ones, and the elevating body is only inserted into the horn stem, so the brake system Each part can be made lighter and smaller, and the weight of the rolling wheels can be reduced.

Since each brake body provided with brake shoes is supported by a pair of arms, the brake body does not vibrate during braking.

Embodiments of the present invention will be described in detail below with reference to the drawings.

In Fig. 1, reference numeral 1 denotes a horn, which is connected to the lower end of a horn stem 3 that is rotatably inserted into a helad tube 2 of the frame, and is pivotally supported near a shoulder 4 of the horn. A pair of brake bodies 5, 5 protrude oppositely from each other, and brake shoes 6.6 attached to the tips of the brake bodies 5, 5 are oppositely proximate to the side surface of the rim 7 of the wheel.

As shown in FIG. 3, the brake body has a pair of arms 9, 9 extending from the brake shoe mounting portion 8 at appropriate intervals, with their tips positioned across the horn 1. Both brake bodies 5, 5 have a mutually symmetrical shape, and a tongue piece 11.1 having a through hole 10.10 is provided on the upper side of the brake shoe mounting portions 8, 8.
1 is extended.

A bundle post 12 is inserted into the volk stem 3, and the bundle post 12 is lifted up by the action of a pulling rod 13 that passes through it and a nut 14 that is screwed into the lower end of the rod and is fitted inside the lower end of the bundle post. is fixed to the horn stem 3.

For this reason, the nut 14 has a tapered outer periphery, and when the nut 14 is pulled up by tightening the pulling rod 13, the tapered surface of the outer periphery acts to spread the lower end of the bundle post.

A cylindrical body 15 with an open bottom end is fitted into the lower end of the horn stem 3, and a through hole 16 of an appropriate size is bored in the top 18 of the upper end of the cylindrical body 15.

A lifting body 17 is inserted into the cylindrical body, and the tip of a brake wire 19 that passes through the lifting rod 13 and is led out from the through hole 16 of the top portion 18 is fixed to this with a set screw 23. A spring 20 interposed between the elevating body and the top 18 of the cylindrical body 15 provides a descending return force to the elevating body, and a pair of rods 21, 21 swingably attached to the lower end of the spring 20 provides the lower brake bodies 5, 5. The tongue piece 11.11 and the elevating body 17 are connected.

The outer cable 22 that swingably accommodates the brake wire 19 is connected to the brake lever 2 of the bundle (not shown).
4 and the upper end head of the pulling rod 13, the brake wire 19 has one end fixed to the brake lever 24, and is then inserted into the outer cable 22.
As already mentioned, - the other end is fixed to the elevating body 17, and the brake lever and the elevating body 17, that is, the brake body 5,
5 is linked.

That is, when the brake lever is squeezed, the elevating body 17 is pulled up, and the brake bodies 5, 5, which are connected to this by the rods 21 and 21, swing around their pivots, and the brake shoes 6.6 is pressed against the side surface of the rim 7 and is braked.

When the acting force of the brake lever 24 is released, the elevating body 17 is lowered by the spring 20, the brake body 5.5 is returned to its original position, and the braking force is released.

In the case of the above embodiment, the brake bodies 5, 5 are compactly mounted near the shoulders of the fork 1, and the brake bodies 5
, 5 have a simpler shape and are smaller in size than conventional caliper brakes, so the brake can be manufactured at low cost.

In addition, the arms 9, 9 of the brake bodies 5, 5 are equipped with the following functions when braking:
In the case of the illustrated embodiment, both ends of the brake shoe 6 are pivotally supported by a pair of arms 9, so that the brake shoe 6 is small and lightweight and has sufficient strength. In addition to functioning as a brake, the braking force by the brake wire 19 is transmitted to the brake shoes 6.6 with high efficiency, resulting in a high-performance brake.

Furthermore, in terms of appearance, since the brake wire 19 is inserted into the bundle post 12, the unsightly appearance of the conventional one is eliminated.

In particular, in the case of the illustrated embodiment, the fulcrum of the brake body 5.5 was set at an appropriate angle to accommodate a wheel with a substantially triangular rim cross section, and the contact surface of the brake shoe 6.6 was set appropriately. In the case of a competition bicycle, the cross-sectional shape of the wheel rim and the effects of interior components such as brake wires combine to cause air resistance.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the main part of the embodiment of the present invention, and Fig. 2 is the elevating body 1.
Another cross-sectional view near 7, Figure 3 is an exploded view of the main part, and in the figure

Claims (1)

[Scope of utility model registration request] A pair of arms 9 located front and back sandwiching the upper part of Hawk's legs,
9, and is pivotally supported by the hawk leg at the upper end of the iron arm,
A pair of brake bodies 5, 5 that swing in opposite directions, a brake shoe 6 provided at the free end of the brake body facing the side surface of the rim 7 of the wheel, and a brake shoe 6 provided at the lower end of the Hawk stem 3 so as to be movable up and down. The fitted elevating body, a spring 20 that is directly or indirectly interposed between the elevating body 17 and the bow stem 3 and applies a downward biasing force to the elevating body, and the elevating body and the brake bodies 5, 5, respectively. It consists of a pair of rods 21, 21 which are connected to each other and are provided in mutually symmetrical positions, and a brake wire 19 which is connected to the elevating body and which is inserted through the pulling rod 13 which is inserted into the bundle post. A bicycle rim brake that is moved forward and backward using a brake lever 24.