TWI573726B - A magnetic rotational speed sensor device - Google Patents

Description

Return speed induction magnet device

The present invention relates to an induction magnet device, and more particularly to a reciprocating speed induction magnet device for use in a bicycle.

The induction magnet device of a general bicycle includes a magnet and a plastic outer casing, and the magnet is enclosed in the plastic outer casing. The plastic housing includes two surface recesses for the straps to bypass the front surface of the inductive magnet assembly and the inductive magnet assembly mounted to the crank on the inside of the bicycle pedal. However, in general, the magnet in the induction magnet device of the bicycle is covered with plastic, and the magnetic force is thus greatly weakened, so that the sensing effect is not good. The recesses are located on the outer surface of the plastic housing, and the plastic housing has no blocking structure to prevent the straps from falling off the grooves, so that the straps are not easily clamped in the recesses. Moreover, since the belts bypass the induction magnet device from the front, the appearance of the induction magnet device is less beautiful.

Another U.S. Patent No. 6,694,845 is disclosed in which a blind hole is formed at the end of the shaft of the bicycle pedal, and a magnet is magnetically fixed in the blind hole. However, the magnet is fixed in the rotation shaft of the pedal. Blind holes, difficult for consumers to assemble themselves, can not be used in the market Different types of pedals must be standardized after the bicycle pedal has been standardized.

Therefore, how to develop a new induction magnet device that is fixed at a position close to the bicycle pedal, exposes the magnet without weakening the magnetic force, and can hide the belt and can easily fix the belt, has become a further discussion of the present invention. theme.

Accordingly, it is an object of the present invention to provide a return speed induction magnet device which is not weakened and more aesthetically pleasing.

Therefore, the reciprocating speed sensing magnet device of the present invention is suitable for a crank disposed inside a bicycle pedal, and includes a magnet holder and a magnet.

The magnet holder has a top surface, a bottom surface, a receiving groove formed by the top surface recessed toward the bottom surface, and a wire harness groove which is spaced apart from each other and penetrates the magnet seat, and each wire groove is used for laying A wire holder that fixes the magnet holder to the crank inside the bicycle pedal and limits the wire harness.

The magnet is fixed in the accommodating groove and exposed on a top surface of the magnet holder.

The effect of the invention is that the magnet is exposed on the top surface of the magnet holder to avoid being blocked by the shield and reducing the magnetic force, thereby ensuring the correctness of the magnetic induction. Moreover, the wire harness penetrates the magnet holder so that the wire harness passing through the wire harness is not easily removed and is not exposed on the surface of the rotating speed sensing magnet device, so that the user can easily operate the wire harness to fix the rotating speed sensing magnet device to the inside of the bicycle pedal. The crank increases and looks back to the aesthetics of the speed-sensing magnet device.

100‧‧‧Return speed induction magnet device

1‧‧‧magnet holder

11‧‧‧ top surface

12‧‧‧ bottom

13‧‧‧ accommodating slots

14‧‧‧beam trunking

15‧‧‧ gap

16‧‧‧Seat

17‧‧‧ Lower body

18‧‧‧Connecting Department

2‧‧‧ magnet

200‧‧‧Bundle

300‧‧‧ crank

400‧‧‧ bicycle pedal

Other features and advantages of the present invention will be apparent from the embodiments of the present invention. FIG. 1 is an exploded perspective view showing a combination of components of an embodiment of the reciprocating induction magnet device of the present invention; Figure 2 is a perspective view showing the embodiment; Figure 3 is a cross-sectional view taken along line III-III of Figure 2, illustrating the structure of the embodiment; and Figure 4 is a perspective view showing the embodiment disposed in a On the crank on the inside of the bicycle pedal.

Referring to FIG. 1 to FIG. 4, the reciprocating speed sensing magnet device 100 of the present invention is applied to a crank 300 disposed inside a bicycle pedal 400, and includes a magnet holder 1 and a magnet 2.

The magnet holder 1 has a top surface 11 , a bottom surface 12 , a receiving groove 13 and a second beam slot 14 . The accommodating groove 13 is recessed from the top surface 11 toward the bottom surface 12 to accommodate the magnet 2 and has a shape corresponding to the magnet 2. In this embodiment, the magnet 2 is a cylindrical body, so the accommodating groove 13 is a circular accommodating space, but is not limited thereto. In various embodiments, the shape of the receiving groove 13 can be adjusted according to the shape of the magnet 2. The wire harness grooves 14 are parallel to each other and are interposed between the accommodating groove 13 and the bottom surface 12 and parallel to the bottom surface 12 to penetrate the magnet holder 1 . Each of the wire grooves 14 is configured to pass through the magnet holder 1 . The wire harness 200 of the crank 300 inside the bicycle pedal 400 limits the wire harness 200.

In this embodiment, the magnet holder 1 is a cylindrical metal material. There is a gap 15 between the accommodating groove 13 and the bottom surface 12, and the gap 15 extends from the circumference of the magnet holder 1 toward the axis and is parallel to the bottom surface 12 and communicates with the wire harness grooves 14. The magnet holder 1 is separated from the gap 15 by an upper body 16 having a top surface 11 and a receiving groove 13, a lower body 17 having a bottom surface 12 and the wire harness grooves 14, and a connecting upper body 16 and a lower seat. The body 17 is located at the connecting portion 18 between the wire harness grooves 14. In the present embodiment, the upper body 16, the connecting portion 18 and the lower base 17 are integrally connected. The user can use the gap 15 to place the wire harness 200 laterally into the wire harness groove 14 without being pierced by both ends of the wire harness groove 14, so that the wire harness 200 can be easily disposed in the wire harness groove 14. Furthermore, the gap 15 can also reduce the weight of the magnet holder 1. Of course, it is also possible to implement the magnet holder 1 without the gap 15.

When the user wants to fix the magnet holder 1 to the crank 300 on the inner side of the bicycle pedal 400, the wire harness 200 that is inserted through the wire harness groove 14 is sandwiched between the upper body 16 and the lower seat body 17 to make the wire harness. The cable 200 is not easily removed, making it easier for the user to operate the wire harness 200 to secure the magnet holder 1 to the crank 300 on the inside of the bicycle pedal 400.

Further, since the wire harness groove 14 is located in the lower seat body 17, the wire harness 200 can be hidden under the upper seat body 16, and the overall appearance of the speed sensing magnet device 100 can be maintained. In addition, in the present embodiment, the magnet holder 1 is made of a metal material, which can increase the appearance texture and enhance the magnetism of the magnet 2. However, the magnet holder 1 can be made of other materials such as plastic, and is not limited to this embodiment.

The magnet 2 is fixed in the accommodating groove 13 and exposed to the top surface 11 of the magnet holder 1 . In this embodiment, since the magnet holder 1 is made of a metal material, the magnet 2 can be fixed in the accommodating groove 13 by magnetic attraction, but if the magnet The seat 1 is not made of metal and can be fixed by other means, such as fixing with a glue or fixing the magnet 2 in the receiving groove 13 in a tight fit manner. When the user steps on the bicycle pedal 400, a sensor (not shown) mounted on the bicycle frame can sense the magnetic force of the rotational speed sensing magnet device 100 to record the number of turns of the user pedaling the bicycle pedal 400. The magnet 2 is exposed on the top surface 11 of the magnet holder 1, so that the magnetic force is not blocked by the shield, and the correctness of the induction is ensured.

In summary, the magnet 2 can be exposed on the top surface 11 of the magnet holder 1 to prevent the magnetic force from being obscured and weakened, thereby ensuring the correctness of the magnetic induction. Furthermore, the wire harness groove 14 penetrates the magnet holder 1 so that the wire harness 200 that is passed through the wire harness groove 14 is not easily detached, so that the user can easily operate the wire harness 200 to easily fix the return speed sensing magnet device 100 to the bicycle pedal. The crank 300 on the inner side of the 400 is indeed capable of achieving the object of the present invention.

However, the above is only the embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made by the patent application scope and the patent specification of the present invention are still It is within the scope of the patent of the present invention.

100‧‧‧Return speed induction magnet device

1‧‧‧magnet holder

11‧‧‧ top surface

12‧‧‧ bottom

13‧‧‧ accommodating slots

14‧‧‧beam trunking

15‧‧‧ gap

16‧‧‧Seat

17‧‧‧ Lower body

18‧‧‧Connecting Department

2‧‧‧ magnet

Claims (5)

The utility model relates to a revolving speed induction magnet device, which is suitable for a crank disposed on a bicycle pedal inner side, comprising: a magnet seat having a top surface, a bottom surface, a receiving groove formed by the top surface recessed toward the bottom surface, and two a wire slot spaced apart from the magnet holder, each wire slot is configured to pass a wire harness of the crank that fixes the magnet seat to the inside of the bicycle pedal and to limit the wire harness; and a magnet, The accommodating groove is fixed in the accommodating groove and exposed on the top surface of the magnet holder. The reciprocating-speed sensing magnet device of claim 1, wherein the magnet holder is a columnar body and the axis thereof passes through the top surface and the bottom surface, and the magnet holder further has a receiving groove and the bottom surface a gap extending from the periphery of the magnet holder toward the axis and spaced apart from the bottom surface and communicating with the beam line slot, the magnet holder being separated by the gap region and having the top surface and the receiving portion The upper seat of the slot, a lower base having the bottom surface and the wire harness grooves, and a connecting portion connecting the upper base body and the lower base body between the wire harness grooves. The reciprocating speed sensing magnet device according to claim 2, wherein the upper seat body, the connecting portion and the lower seat body are integrally connected. The reciprocating speed induction magnet device according to claim 1, wherein the magnet holder has a cylindrical shape. The reciprocating speed sensing magnet device according to claim 1, wherein the magnet holder is made of a metal material.