JPH04212687A - Tension adjuster including wire, etc. - Google Patents

Abstract

PURPOSE:To offer such a tension adjuster such as a wire or the like that can automatically adjust its tension condition by imparting a constant tension at all times even if elongation is produced in the wire or the like to be set up in a braking device. CONSTITUTION:A fixed pulley 3 with a built-in one-way clutch 5 and a moving pulley 6 being supported by a shaft frame 7 with a second wire mounting part 7d both are installing in a frame 2 provided with a first wire mounting part 2c, while there is provided a spring member 9 being clamped to an inner wall of the frame 2 whose one end side is rolled on by the fixed pulley 3 and the other end side is wound on the moving pulley 6 and thereby is turned over, and two wires 11, 12 are stretched at a constant tension by dint of tensile force of the spring member 9. When elongation is produced in these wires 11, 12, the moving pulley 6 is shifted by the tensile force of the spring member 9, thereby preventing any slack in the wire from occurring.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tension adjuster for wires, etc., which is used to constantly apply constant tension to a wire, electric wire, etc. to prevent the wire from sagging.

0002

2. Description of the Related Art Some types of brakes used for bicycles, motorcycles, etc. consist of a brake operating section provided near the handlebar and a brake operating section connected to the brake operating section via a wire.

[0003] In this type of brake, the wire stretched between the brake operating part and the actuating part must always have a certain distance, and if the wire stretches, the brake The play in the operating section becomes large, which impairs the feeling of operation.

Conventionally, as a measure when the wire is stretched,
A connecting member consisting of, for example, a bolt and a nut that is screwed together is interposed between the wire and the brake actuating part or the operating part, and the degree of threading of this connecting member is adjusted, that is, the wire is stretched. By screwing in the bolts, etc.
The wire was re-strung at a constant tension to compensate for the increase in play caused by the wire stretching.

[0005]

[Problems to be Solved by the Invention] However, performing such operations is troublesome. Additionally, since it is difficult to judge the degree of adjustment, it is common practice to transport the bicycle to a dealer or repair shop and have it adjusted.
There is also the problem that it takes time and effort. The present invention has been made to solve the above-mentioned problems, and even if the wire etc. stretches, it can be adjusted by automatically applying a constant tension to the wire etc. without performing any special adjustment operation. The purpose of the present invention is to provide a tension adjuster for wires, etc., which can be kept in place.

[0006]

[Means for Solving the Problems] A tension adjuster such as a wire according to the present invention includes a frame that rotatably supports a fixed pulley and houses a movable pulley that rotates substantially parallel to the fixed pulley, and a frame that supports the fixed pulley and the movable pulley. A one-way clutch is interposed between the rotary shaft and one end thereof is wound around the fixed pulley, and the other end is wound around the movable pulley and after being reversed, is fixed to the inner wall of the frame. a tabular spring member; a first wire attachment portion provided on the outer wall of the frame on the fixed pulley side; and a second wire attachment portion capable of rotatably supporting the movable pulley; A shaft frame of the movable pulley to which a wire or the like can be connected to the second wire attachment part through a through hole formed in the frame part on the movable pulley side opposite to the second wire attachment part. .

[0007]

[Operation] In this structure, when the wire or the like stretches, the movable pulley moves toward the fixed pulley by the amount of stretch of the wire or the like due to the tensile force of the spring member. therefore,
A constant tension is always applied to the wires and the like, so that they are stretched without sagging. Moreover, due to the action of the one-way clutch disposed on the fixed pulley, the spring member wound around the fixed pulley is not pulled out from the fixed pulley.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in more detail below based on embodiments shown in the drawings. In the figure, reference numeral 1 indicates a tension adjuster such as a wire according to the present embodiment, which includes a frame 2, a fixed pulley 3, a one-way clutch 5, a movable pulley 6, a shaft frame 7, a constant torque spring 9, etc. .

[0009] The frame 2 is formed into a substantially box shape, and its upper surface is comprised of a removable lid member 2a. Further, a first wire attachment part 2c for connecting and fixing wires, electric wires, etc. is protruded from the outer wall of one end face 2b, and a first wire attachment part 2c is provided on the other end face 2d opposite to the first wire attachment part 2c. A through hole 2e is formed in the portion. Note that the through hole 2e is not limited to being formed by drilling a part of the end surface 2d, and may be formed by cutting out a groove from the upper edge of the end surface 2d. .

The fixed pulley 3 is located inside the frame 2 on the side surface 2 of the frame 2 on the side of the first wire attachment portion 2c.
It is held freely rotatable by a rotating shaft 4 which is disposed across f and 2g.

The one-way clutch 5 is interposed between the fixed pulley 3 and the rotating shaft 4, and has the function of preventing the fixed pulley 3 from rotating in reverse.

The structure of the one-way clutch 5 is not particularly limited, and various conventionally known types can be used. As shown in FIG. 3, the one-way clutch 5 used in this embodiment has a bearing hole 5a that fits into the rotating shaft 4, and a roller holding groove 5e that is gradually narrowed on one side at a predetermined location on the inner circumference. The roller receiving outer ring 5b formed therein and the rotating shaft 4 loaded into the roller holding groove 5e
The needle roller 5c that comes into sliding contact with the roller holding groove 5e
A spring 5d is supported by a spring housing groove 5f formed adjacent to the spring 5d, and constantly urges the needle roller 5c in the direction in which the roller holding groove 5e becomes narrower.

Therefore, when the fixed pulley 3 attempts to rotate so as to cause the needle roller 5c to roll in the direction in which the roller holding groove 5e becomes narrower, the fixed pulley 3 engages with the rotating shaft 4 and is prevented from rotating. On the other hand, needle roller 5
When rotating so as to roll c in the opposite direction, it can rotate freely.

The movable pulley 6 is disposed within the frame 2 so as to rotate substantially parallel to the fixed pulley 3 and positioned on the other end surface 2d side in which the through hole 2e is formed.

Here, 7 is a shaft frame arranged to support the movable pulley 6, and includes support plates 7b and 7c that are bifurcated from the base 7a and protrudes from the rear end of the base 7a. and a second wire attachment part 7d. This shaft frame 7
connects the wire attachment portion 7d to the other end surface 2d of the frame 2.
The frame 2 is loosely inserted into a through hole 2e formed in the frame 2, with a part thereof facing the outside of the frame 2. Therefore, the movable pulley 6 is rotatably supported within the frame 2 by the rotary shaft 8 which is disposed between the support plates 7b and 7c.

Reference numeral 9 denotes a constant torque spring, which is made of a thin strip of stainless steel, and in the free state, as shown in FIG.
It has a shape in which the heat-treated material is wrapped closely together. This constant torque spring 9 is attached to the outer periphery of the fixed pulley 3.
One end is wound with or without being fixed, and the other end 9a is wound around the outer periphery of the movable pulley 6 and reversed.
It is fixed and arranged by 0 etc.

Next, the operation of the wire tension adjuster 1 according to this embodiment will be explained. First, for example, a wire stretched over a brake device of a bicycle or the like is composed of two wires, one wire 11 is connected to a brake operating section, and the other wire 12 is connected to a brake operating section.

Furthermore, the end of one wire 11 is connected to the first wire attachment portion 2c of the tension adjuster 1 of this embodiment.
while connecting and fixing the end of the other wire 12 to the second wire 12.
The tension adjuster 1 is connected and fixed to the wire attachment portion 7d of the wire attachment portion 7d. Although not shown, it is preferable to provide a guide member outside the frame 2 of the tension adjuster 1 to slidably hold the frame 2 to stabilize the tension adjuster 1.

In this state, the constant torque spring 9 is pulling the wires 11, 12 with a constant tensile force, so that the wires 11, 12 are tensioned without sagging.

On the other hand, if the wires 11 and 12 are elongated due to long-term use, a constant tensile force is always acting on the constant torque spring 9, so the constant torque spring 9
gets caught up in the fixed pulley 3. As a result, the movable pulley 6 moves within the frame 2 toward the fixed pulley 3 together with the shaft frame 7.

[0021] Therefore, since a constant tension is always applied to the wires 11 and 12, the wires 11 and 12 are always stretched with a constant tension without sagging.

Furthermore, even if the wire 12 is pulled in the F direction as shown in FIG. Torque spring 9 is fixed pulley 3
It will not be pulled out to the moving pulley 6 side. Therefore, there is no problem with brake operation.

Furthermore, since a pulley structure is adopted in which the fixed pulley 3 and the movable pulley 6 are arranged, the tensile force applied to the fixed pulley 3 by pulling the wire 12 is reduced, allowing long-term use. It is.

In the above embodiment, the moving pulley 6 is directly supported on the rotating shaft 8, but for example,
A viscous liquid layer (not shown) formed by filling oil may be provided between the moving pulley 6 and the movable pulley 6. With such a configuration, a predetermined viscous resistance can be exerted in the winding direction of the constant torque spring 9, so that instantaneous viscous resistance can be applied to the winding direction of the constant torque spring 9. - It is possible to prevent transient wire slack from being absorbed by the return force of the constant torque spring 9. On the other hand, even with such a configuration, even if elongation occurs due to long-term use, if the overall length of the wire becomes long, it is possible to absorb the slack, as in the above-described embodiment.

Furthermore, in the above embodiment, the wires 11 and 12
are integrally fixed to the wire attachment parts 2c and 7d, respectively, but considering the possibility of replacing only the wires 11 and 12, it is also possible to connect them detachably. When replacing the wire, it is necessary to return the shaft frame 7 to the initial position, so a mechanism is provided in the one-way clutch 5 that can be unlocked as necessary so that the constant torque spring 9 can be pulled out from the fixed pulley 3 toward the movable pulley 6. It is preferable to provide one.

Further, in the above-described embodiments, the case where the wire tension adjuster is used in a brake device is explained, but the wire tension adjuster of the present invention is not limited to this. It can also be used in cases where it is kept stretched. According to this, electric wires such as power supply cords do not get in the way.

[0027]

[Effects of the Invention] The tension adjuster for wires, etc. of the present invention has a structure that includes a spring member that always applies a constant tensile force to the wires, etc., so that the wires, etc., which should be tensioned at a predetermined tension, do not slacken. do not have. Furthermore, since the structure is such that a one-way clutch is interposed in the fixed pulley, the spring member is pulled out by reversing the fixed pulley, and the tension applied to the wire etc. is reduced, so that no slack occurs. Therefore, if used for wires used in brake devices of bicycles, etc., it is possible to automatically adjust the elongation of wires etc. due to long-term use.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of a tension adjuster such as a wire according to the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG. 1;

FIG. 3 is a sectional view showing a one-way clutch.

FIG. 4 is a perspective view of the constant torque spring in a free state.

[Explanation of symbols]

1 Tension adjuster for wire etc. 2 Frame 3 Fixed pulley 4 Rotation axis 5 One-way clutch 6. Moving pulley 7 Shaft frame 8 Rotation axis 9 Constant torque spring

Claims (2)

[Claims] 1. A frame that rotatably supports a fixed pulley and accommodates a movable pulley that rotates substantially parallel to the fixed pulley; a one-way clutch interposed between the fixed pulley and its rotating shaft; One end side is wound around the fixed pulley, and the other end side is wound around the movable pulley and after being reversed, a spring member is fixed to the inner wall of the frame, and a spring member is provided on the outer wall of the frame on the fixed pulley side. 1st
a wire attachment portion capable of rotatably supporting the movable pulley and a second wire attachment portion;
a shaft frame of the movable pulley to which a wire or the like can be connected to the second wire attachment part through a through hole formed in the frame part on the movable pulley side opposite to the second wire attachment part; Features a tension adjuster for wires, etc. 2. The tension adjuster for a wire or the like according to claim 1, wherein the movable pulley is held with respect to its rotating shaft via a viscous liquid layer.