JP2001228163A - Magnetic body holder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lower the cost per a single magnetic body holder, to increase the fixing strength of a magnetic body holder to a spoke, to allow the magnetic body holder to be installed to various kinds of bicycles, and to improve the numerical detection accuracy such as the number of revolutions and a rotation angle by a sensor when the magnetic body holder is used in an automatic speed changing device or a speed meter provided with an electromagnetic pickup system. SOLUTION: This magnetic body holder is constituted of a holder main body, which is installed to the wheel of a bicycle having a hub in the center and a rim in the circumference via a spoke extending radially from the hub and provided with a holding part arranged on one side for holding a magnetic body and at least a part of clamping pieces arranged on the other side for clamping the magnetic body, and an expansion preventing member arranged across a pair of clamping pieces so as to hold them from the outside for preventing the pair of clamping pieces clamping the spoke from extending outward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic material holder for holding a magnetic material on spokes of a bicycle.

[0002]

2. Description of the Related Art Conventionally, flasher devices, speedometers and the like have been known as electronic control devices for bicycles. In recent years, a variety of automatic transmissions and security devices have been proposed.

[0003] Most of the electronic controls used for such bicycles are of the electromagnetic pickup type. The outline is described below.

[0004] An apparatus equipped with an electromagnetic pickup system is known as L
It includes a circuit board made of SI or the like, a sensor for detecting the rotation speed of the wheel, and a power supply for supplying a current to these devices. The circuit board is generally housed in a resin box and attached to the bicycle frame, the sensor is attached to one of the front and rear forks, and the magnetic body is attached to the spoke of the rear wheel or front wheel so as to face the sensor .

In this sensor, a coil is wound around a permanent magnet. When a magnetic body attached to a spoke passes through the sensor as the wheel rotates, the magnitude of the magnetic flux passing through the coil changes, and An AC voltage is generated at both ends. Since the frequency of the AC voltage is proportional to the speed of the rotating body, the rotation speed is detected by measuring the frequency. The above electronic control system is called an electromagnetic pickup system.

The magnetic body is fixed to the spokes after being held by the magnetic holder. FIG. 8 is a view showing a state where the magnetic material holder invented by the present inventors is attached to the spoke. FIG. 9 is a perspective view of a holder body constituting the magnetic material holder, and FIG. 10 is a perspective view of a state where the magnetic material holder holds a magnetic material.

The magnetic holder 125 is made of a non-magnetic metal such as aluminum, and has a holding portion 103 for holding the magnetic material 116 on one side and a pair of holding pieces 102 for holding the spokes 107 on the other side. 101
And straddle a pair of holding pieces 102 and hold from the outside,
An expansion prevention member 108 for preventing the pair of holding pieces 102 holding the spokes 107 from spreading outward, and a pair of holding pieces inserted between the pair of holding pieces 102 to forcibly open the pair of holding pieces 102. It is constituted by an insertion member 110 that presses the 102 against the inner wall of the expansion preventing member 108.

The insertion member 110 used here has a screw tip angle of 90 degrees or more and an angle of the screw thread 111 of 6 degrees.
This is an ISO screw standardized by ISO at 0 degrees.
The ISO screw has a diameter larger than the distance L between the pair of holding pieces 102.

Hereinafter, the magnetic material holder 125 is connected to the spoke 10
The step of attaching to 7 will be described. First, the holding unit 1
The magnetic body 116 is bonded to the concave portion 114 provided in the substrate 03 by using an adhesive. Next, a pair of holding pieces 102 (102
a, 102b), one spoke 107 is sandwiched, and the spoke 107 is inserted to the deepest part 113. Next, the expansion preventing member 108 is inserted into the pair of holding pieces 102. Then, the insertion member 110 is screwed into the spoke 107 from between the pair of holding pieces 102.

As a result, the insertion member 110 forcibly opens the pair of holding pieces 102 and presses the outer surfaces of the holding pieces 102a and 102b against the inner wall of the expansion preventing member 108. Through the above steps, the magnetic material holder 125 is fixed to the spoke 107. Further, the magnetic material holder 125
Since it is made of metal, it has a high fixing force when attached to the spoke 107 and has excellent durability against various external impacts.

[0011]

However, since the magnetic material holder 125 invented by the present inventors is made of metal, there is a problem that the cost per magnetic material holder is increased. .

Therefore, the present inventors have proposed a magnetic material holder 12.
An attempt was made to reduce the cost by using a resin instead of metal without changing the shape of No. 5. Then, in the case of resin, there has been a problem that the fixing force, which has been increased by the mechanical properties such as the strength, toughness, ductility, and hardness of the metal, cannot be obtained. When the magnetic holder 125 made of resin is attached to the spoke 107 in the same manner as the magnetic holder 125 made of metal, the pair of holding pieces 102 become V-shaped by inserting the insertion member 110 so that the holding pieces 102a and 102b are V-shaped. Form an inclined surface. Along with this, the expansion preventing member 108 attached from the outside so as to straddle the pair of holding pieces 102 is moved toward the holding portion 103 and comes into contact with the spoke 107. The force applied when inserting the insertion member 110 is concentrated on the deepest portion 113 in contact with the spoke 107. Then, since the resin has a very good ductility, the force acting in the direction of the holding portion 103 is transmitted to the deepest portion 113 via the spoke 107, and the position of the deepest portion 113 is further moved to the holding portion 103 side. Along with this, the bottom surface of the concave portion 114 rises, and the bonding area with the magnetic body 116 is reduced, so that the magnetic body 116 may fall off even if bonding is performed using a strong adhesive.

Further, the spoke 107 is deformed accordingly. Then, the tension of the spokes 107 becomes uneven, and the balance of the entire wheel 19 is lost. Therefore, when a lateral load is applied to the wheel 19 due to a steering wheel operation during running of the bicycle, the rim 21 cannot be tolerated and collapses. There is also a problem that it will happen.

Further, since the single-point fixing method of fixing only one spoke 7 is used, the magnetic holder 12
In No. 5, there is also a problem that rotation cannot be performed with respect to rotation about the spoke 107 as an axis.

Further, when the magnetic holder 125 is used in an automatic transmission or a speedometer of an electromagnetic pickup system, a sensor 24 attached to the fork 20 is used.
The distance S between the magnetic body 116 and the spokes 107 must always be maintained at 2 to 3 mm. However, there is some difference in the distance between the fork 20 and the spoke 107 depending on the bicycle. For this reason, the magnetic material holder 125 invented by the present inventors cannot cope with the difference in the distance, and there is a problem that the accuracy of the numerical value detection by the sensor 24 such as the number of rotations and the rotation angle is reduced. .

Further, since an ISO screw is used for the insertion member 110, the threading is weak, and a female screw is not easily formed on the inner walls of the pair of holding pieces 102, so that there is a problem that a sufficient fixing force cannot be obtained.

An object of the present invention is to solve such various problems in the conventional magnetic holder 125, and can be manufactured at low cost and has high mounting strength. Is to provide.

[0018]

SUMMARY OF THE INVENTION The present invention is a magnetic holder, and is configured as follows to solve the above-mentioned technical problem. That is, the magnetic material holder of the present invention is a magnetic material holder for holding a magnetic material on a bicycle wheel having a hub at the center and having a rim on a peripheral edge via spokes extending radially from the hub. A holder body attached to the spoke, having a holding portion for holding the magnetic body on one side, and a holder body having at least one pair of holding pieces for holding the spoke on the other side,
The present invention is characterized in that it comprises an expansion preventing member that straddles the pair of holding pieces and holds the pair from the outside, and prevents the pair of holding pieces holding the spoke from spreading outward.

Further, the magnetic material holder has an insertion member inserted between the pair of holding pieces to forcibly open the pair of holding pieces and press the pair of holding pieces against the inner wall of the expansion preventing member. It is characterized by having.

The magnetic material holder according to the present invention comprises the above-mentioned essential components. However, the present invention is also established when the components are specifically as follows. The specific constituent element is that in the magnetic material holder of the present invention, the insertion member is formed by opening one end of the pair of holding pieces outwardly larger than the other end and tilting each holding piece. It is characterized in that the expansion prevention member is pressed and moved toward the spoke by a surface.

Further, it is preferable that the insertion member is a tapping screw having a diameter larger than that between the holding pieces.

Still further, the holding portion has a concave portion for holding the magnetic material, and at the periphery of the concave portion, at least a drop-off preventing portion for projecting inward of the concave portion and holding the magnetic material is spaced apart from each other. It is characterized by having one.

Further, the magnetic material holder has a tongue piece having a base end on the holder body and extending toward a spoke different from the spoke held by the holding piece, and the tongue piece is provided with the tongue piece. It is characterized in that it is engaged with a spoke different from the spoke held between the pieces. Further, in the present invention, in order to convert the pressure from the insertion member into elastic energy, accumulate it and obtain a sufficient fixing force, a washer is provided in contact with the spoke and between the spoke and the tongue piece. Is preferred.

Further, the magnetic material holder is provided with a spacer which is located between the spoke held by the holding piece and the holding portion and adjusts a distance from the spoke to the magnetic material.

According to the magnetic material holder of the present invention configured as described above, after the magnetic material is adhered to the concave portion of the holding portion with an adhesive, the falling-off preventing portion is projected inward of the concave portion. By applying pressure, the falling-off preventing portion is in a state of holding down the magnetic body. Thereby, when the insertion member is inserted from between the pair of holding pieces, the spoke is moved to the holding portion side, the bottom surface of the recess is raised, and the bonding area with the magnetic body is reduced. Even in this case, the magnetic material can be prevented from falling off by the falling-off prevention member.

Further, according to the magnetic holder of the present invention configured as described above, since the tongue piece holds a different spoke from the spoke held by the pair of holding pieces, It is possible to prevent the rotation about the spoke on which the piece is held as an axis. Further, by attaching the washer between the spoke and the tongue piece and the spoke, the fixing force is improved. Further, since the spokes are in two-point contact with the washer, the pressure acting on the holding portion side from the insertion member is dispersed by the washer and transmitted uniformly to the holding portion. This prevents the bottom surface of the concave portion from rising and reducing the adhesion area of the magnetic body, and prevents the magnetic body from falling off. In addition, it is possible to prevent the spoke from being deformed.

Further, according to the magnetic holder configured as described above, since the spacer is provided between the holding portion and the spoke, the distance between the magnetic body and the spoke can be freely adjusted. Becomes possible. Accordingly, even when the magnetic holder according to the present invention is used in an automatic transmission or a speedometer using an electromagnetic pickup system, it is possible to sufficiently cope with a difference in the distance from the fork to the spoke depending on the bicycle model of concern. This makes it possible to detect a rotation value and a rotation angle with higher accuracy.

[0028]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a magnetic holder according to the present invention. FIG.
7 to 7 show a magnetic holder according to an embodiment of the present invention.

As shown in FIGS. 1 to 3, the magnetic material holder 25 has a holding portion 3 for holding the magnetic material 16 on one side and a pair of holding pieces 2 (2a, 2a, 2) for holding the spokes 7 on the other side.
b), a pair of holding members 2 that straddle a pair of holding pieces 2 and hold from outside thereof to prevent the pair of holding pieces 2 holding the spokes 7 from spreading outward, and a pair of holding members. An insertion member 10 inserted between the pieces 2 to forcibly open the pair of holding pieces 2 and press against the inner wall of the expansion preventing member 8.

Further, the magnetic material holder 25 has a holder stopper 9 attached to the holder main body 1 with a base end and extending toward a spoke different from the spokes 7 sandwiched between the pair of holding pieces 2, An annular washer 6 having a contact point with the spoke 7 and being mounted between the spoke 7 and the holder stopper 9, and a distance S from the spoke 7 to the magnetic body 16 provided between the spoke 7 and the holding portion 3 can be freely adjusted. And an adjustment ring 5.

FIG. 2 is a perspective view of the holder main body 1. The holder body 1 is formed by a holding portion 3 and a pair of holding pieces 2. The holding portion 3 and the pair of holding pieces 2 are provided at positions facing each other.

The holding section 3 has a cylindrical shape with a bottom and accommodates the magnetic body 6 in the recess 4. In the magnetic material holder 25 according to one embodiment of the present invention, since the magnetic material 16 used is cylindrical, the concave portion 14 is also formed in a cylindrical shape.
A plurality of falling-off preventing portions 4 are provided on the periphery of the concave portion 14. The falling-off preventing portion 4 projects vertically with the peripheral edge of the concave portion 14 as a reference plane. It is curved along the periphery of the concave portion 14 and is provided at a predetermined interval from each other.

The pair of holding pieces 2 are formed by providing two cuts at opposite positions from ends of a hollow cylindrical column having a smaller outer diameter and a constant thickness than the holding section 3. The gap between the holding piece 2a and the holding piece 2b formed by the cut has a constant distance L regardless of the cut depth. The deepest part 13 of the cut is formed in a semicircular shape whose diameter is the distance between the holding pieces 2a and 2b.

The expansion preventing member 8 is an annular member having a diameter slightly larger than the pair of holding pieces 2, and is attached to the outside so as to straddle the pair of holding pieces 2. Further, a substantially U-shaped member or a C-shaped member may be used as the expansion preventing member 8. Further, it is preferable to use a non-magnetic material as the material.

The insertion member 10 is preferably a self-tapping screw. A tapping screw has an angle of 9
It is a screw having a sharp point of 0 ° or less and a screw thread provided near the sharp point. Furthermore, since the thread of the self-tapping screw is formed in a spiral shape with an acute angle, the self-tapping screw itself can be easily threaded.

As shown in FIG. 4 and FIG.
Is an aluminum plate having a thickness of 0.5 mm, having a hole 17 having a diameter large enough to insert the pair of holding pieces 2 and a tongue piece 18 extending in one direction from the periphery of the hole 17. Have. The tongue piece 18 extends perpendicularly to a spoke different from the spoke 7 held by the holder body 1 and has a length for winding and fixing the spoke.

The washer 6 is an annular member having a thickness of 1.6 mm. This inner diameter is a diameter large enough to allow the pair of holding pieces 2 to be inserted.

The adjusting ring 5 is an annular member having the same inner diameter as the expansion preventing member 8 and the washer 6. There are two types of adjusting rings 5; an adjusting ring 5a having a thickness of 2 mm and an adjusting ring 5b having a thickness of 3 mm. Also, the adjustment ring 5 may be a substantially U-shaped member or a C-shaped member, like the expansion preventing member 8. Further, it is preferable to use a non-magnetic material also for the adjusting ring 5.

Hereinafter, a process of attaching the magnetic material holder 25 of the present invention will be described. FIG. 6 shows a magnetic material holder 25 of the present invention.
FIG. 7 shows a state in which the magnetic body holder 25 of the present invention is attached to the spokes 7.

First, the magnetic body 6 is bonded into the recess 14 of the holder body 1. Thereafter, as shown in FIG.
Is pressed toward the inside of the concave portion 14. Next, the holder stopper 9, the adjusting ring 5, and the washer 6 are inserted into the pair of holding pieces 2 so as to be in close contact with each other in this order. Then, the spokes 7 are sandwiched between the pair of holding pieces 2 in accordance with predetermined positions of the spokes 7 of the bicycle wheel, and the expansion preventing member 8 is attached to the pair of holding pieces 2.
Insert Then, the insertion member 10 is vertically screwed into the spoke 7 from between the pair of holding pieces 2. Finally, the tongue piece 18 of the holder stopper 9 is folded back and fixed so that a different spoke from the spoke 7 held by the holder body 1 is involved.

As described above, by pressing the material of the fall prevention portion 4 into the recess 14, the magnetic body 16 is prevented from falling from the recess 14. Therefore, even if the portion adhered by the adhesive comes off, the falling-off prevention member 4 presses the magnetic body 16 so that the magnetic body 16 can be prevented from falling off from the concave portion 14.

Further, since the distance L between the pair of holding pieces 2 is smaller than the diameter of the spokes 7, the spoke 7 is connected to the pair of holding pieces 2
When the spoke 7 is inserted to the deepest portion 13, the spoke 7 forcibly opens the pair of holding pieces 2. As a result, the spoke 7 and the pair of holding pieces 2 can be further pressed against each other.

Further, since the adjusting ring 5 is provided between the spoke 7 and the holding portion 3, the distance from the spoke 7 to the magnetic body 16 can be freely adjusted.
Accordingly, when the magnetic material holder 25 of the present invention is used for a bicycle automatic transmission or a speedometer having an electromagnetic pickup method, the sensor 24 attached to the fork 20 is not affected by the attachment position and the type of bicycle. The distance from to the magnetic body 16 can always be in the most preferable state.

By attaching the washer 6, the attachment state of the holder stopper 9 and the adjustment ring 5 is improved. Further, since the washer 6 is in two-point contact with the spoke 7, the force applied to the spoke 7 via the expansion preventing member 8 when the insertion member 10 is screwed is directly absorbed.
Therefore, the force can be uniformly transmitted to the holding section 3 side. As a result, the bottom surface 15 of the recess 14 can be prevented from being deformed, so that the adhesion area between the bottom surface 15 of the recess 14 and the magnetic body 16 is not reduced, and the magnetic body 16
The problem of detachment from the bottom surface can be solved. In addition, since the two points are in contact with the washer 6, the force concentrated on the spokes 7 can be distributed to two places, so that the spokes 7 can be prevented from being deformed. As a result, the tension of the spokes 7 is made uniform, and the balance of the entire wheel 19 is normally maintained, so that the safety when riding the bicycle is enhanced.

When the insertion member 10 is inserted between the pair of holding pieces 2 using a tapping screw and is inserted while performing thread cutting, a screw 11 formed on the tapping screw thread and the inner wall of the pair of holding pieces 2 is formed. The groove 12 is in a threaded state without leaving a gap. Therefore, displacement and rotation of the magnetic material holder 25 itself are prevented, and the mounting strength for fixing the magnetic material holder 25 of the present invention to the spokes 7 is improved.

Further, a holder stopper 9 is provided vertically to a spoke different from the spoke 7 sandwiched by the pair of holding pieces 2, and the spoke is folded back and fixed so that the spoke 7 is used as an axis. Rotation can be prevented. The spokes 7 are provided so as to narrow the distance between the spokes 7 and the adjacent spokes from the rim 21 toward the hub 22. Therefore, by fixing the holder stopper 9 to another adjacent spoke, the magnetic material holder 25 is moved in the direction toward the rim 21 by the centrifugal force generated by the rotational movement of the wheels during running of the bicycle.
Can be prevented from moving.

[0047]

According to the present invention, the fixing force for attaching the magnetic holder to the spoke can be improved while the cost per magnetic holder is sufficiently reduced. Further, according to the present invention, the magnetic material holder can be mounted on various types of bicycles, and when used in an automatic transmission or a speedometer equipped with an electromagnetic pickup system, a numerical value such as a rotation speed or a rotation angle by a sensor is used. Detection accuracy can be improved.

[0048]

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a magnetic holder according to an embodiment of the present invention.

FIG. 2 is a perspective view of a holder main body according to the embodiment of the present invention.

FIG. 3 is a perspective view showing a state in which a magnetic body is held in a holder main body according to the embodiment of the present invention.

FIG. 4 is a front view of the holder stopper according to the embodiment of the present invention.

FIG. 5 is a side view of the holder stopper according to the embodiment of the present invention.

FIG. 6 is a side view showing a state where the magnetic material holder according to the embodiment of the present invention is attached to a bicycle.

FIG. 7 is a partially enlarged view showing a state where the magnetic material holder according to the embodiment of the present invention is attached to the spokes.

FIG. 8 shows a partial cross-sectional view of a conventional magnetic material holder.

FIG. 9 shows a perspective view of a conventional holder body.

FIG. 10 is a perspective view showing a state where a magnetic material is held in a conventional magnetic material holder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 101 Holder main body 2, 102 Nipping piece 3, 103 Holding part 4 Fall prevention part 5 Adjustment ring 6 Washer 7, 107 Spoke 8, 108 Expansion prevention member 9 Holder stopper 10, 110 Insertion member 11, 111 Thread 12, 112 Screw groove 13,113 Deepest part 14,114 Concave part 15 Bottom part 16,116 Magnetic body 17 Hole part 18 Tongue piece part 19 Wheel 20 Fork 21 Rim 22 Hub 23 Bicycle 24 Sensor 25,125 Magnetic body holder

Claims (7)

[Claims] 1. A magnetic material holder for holding a magnetic material on a bicycle wheel having a hub at a center and having a rim on a peripheral edge via a spoke extending radially from the hub, wherein the magnetic material holder is provided on the spoke. A holder body having at least one holding portion for holding the magnetic body and having at least one pair of holding pieces for holding the spokes on the other side, and holding the pair of holding pieces from the outside across the pair of holding pieces, A magnetic material holder, comprising: an expansion prevention member for preventing the pair of holding pieces holding the pair from spreading outward. 2. An insertion member which is inserted between said pair of holding pieces to forcibly open said pair of holding pieces and presses said pair of holding pieces against an inner wall of said expansion preventing member. The magnetic material holder according to claim 1, wherein the magnetic material holder is provided. 3. The insertion member pushes the expansion preventing member toward the spokes by an inclined surface of each of the holding pieces formed by opening one end of the pair of holding pieces outward more than the other end. The magnetic material holder according to claim 2, wherein the magnetic material holder is moved by pressing. 4. The magnetic holder according to claim 2, wherein the insertion member is a tapping screw having a diameter larger than that between the holding pieces. 5. The holding portion has a concave portion for holding the magnetic body, and at least a drop-off preventing portion that protrudes inward of the concave portion and holds the magnetic body is provided at the periphery of the concave portion at a distance from each other. The magnetic material holder according to claim 1, wherein the magnetic material holder has one. 6. The magnetic material holder includes a tongue piece having a base end on the holder body and extending toward a spoke different from the spokes held by the holding piece, wherein the tongue piece is provided on the holding body. The magnetic material holding holder according to any one of claims 1 to 5, wherein the magnetic material holding holder is engaged with a spoke different from the spoke held between the pieces. 7. The magnetic material holder according to claim 1, further comprising: a spacer positioned between the spoke held by the holding piece and the holding portion to freely adjust a distance from the spoke to the magnetic body. Item 7. A magnetic holder according to any one of Items 1 to 6.