JPH0143643Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to a bicycle speedometer in which the frame of the speedometer mechanism is molded from synthetic resin.

(b) Prior art Conventionally, the frame of the speedometer mechanism of this type of bicycle speedometer was made by bending a metal steel plate, so there were many dimensional errors during stamping, etc., and screws were used. Since it was assembled, manufacturing costs were high.

(c) Purpose of the invention This invention eliminates dimensional errors by making the frame of the speedometer mechanism part from synthetic resin, and eliminates the use of conventional screws by assembling using the elasticity of synthetic resin. This is designed to significantly reduce costs.

(d) Structure of the invention The bicycle speedometer of the present invention houses a rotating magnet and a vortex plate in a frame, and the frame has a cross-sectional shape with left and right side walls extending from the base wall. It consists of a synthetic resin lower frame having positioning protrusions on the front and rear edges, and a synthetic resin upper frame having engagement pieces that fit between the protrusions on each of the side walls, the engagement pieces being It is characterized by having tapered side edges that become narrower toward the free end. Therefore, by fitting the tapered side edge of the engagement piece of the upper frame into the side wall between the positioning ridges of the lower frame, the upper frame and the lower frame can be integrated without shifting their fitting positions. be.

(E) Example 1 is a rear case with a front opening, 2 is a translucent front cover that closes this front opening and becomes a lens, 3 is a mounting bracket for a bicycle, 4 is a scale plate, and 5 is a speedometer mechanism part ,6
is a guideline.

In this speedometer mechanism section 5, 7 is a frame made of synthetic resin, and the frame 7 is a cross-sectional lower frame 8.
and an upper frame 9 that covers this.

The synthetic resin lower frame 8 has an output shaft mounting cylinder 11 protruding outward from its base wall 10, and also has an output shaft mounting cylinder 11 protruding from the base wall 10.
A pair of engagement ribs 13 with hook portions 12 are provided inwardly,
Further, from both left and right sides of the base wall 10, the left side wall 14
a and a right side wall 14b are extended, and a hooking protrusion 15 is provided on the outside of these left and right side walls 14a, 14b, and a reinforcement/reinforcing portion is provided on the front and rear edges of the left and right side walls 14a, 14b. Positioning protrusions 16, 17
are integrally molded.

The synthetic resin upper frame 9 has an engaging piece 19 having a hook 18 that fits between the positioning ridges 16 and 17 of the lower frame 9 and is latched to the latching protrusion 15 at both left and right ends of the substrate 20. A hanging piece 21 is bent and extended from the base plate 20 and has a small hole 21a in the substrate 20.
In addition, the engaging piece 19 is formed with tapered side edges 22, 22 that become narrower toward the tip. Therefore, the upper frame 9 has tapered side edges 22, 22. Positioning protrusions 16, 17 for lower frame 8
The hook bar 18 easily passes over the latching protrusion 15 due to the elasticity of the resin, is positioned below the latching protrusion 15, and is latched to the latching protrusion 15. By this, the front and rear edges of the engagement piece 19 are aligned with the positioning protrusion 16 of the lower frame 8,
17 and is integrated with the lower frame 8 without shifting the position of the upper frame 9 in the front-rear direction.

Reference numeral 23 designates an input shaft to which a rotational output is transmitted from a rotational speed measurement unit of a bicycle wheel, and 24 designates a rotating magnet pivotally attached to the shaft end of the input shaft 23.

25 is a mounting plate to prevent this input shaft 23 from coming off;
An insertion hole 26 having a larger diameter than the shaft portion of the input shaft 23 and a loose insertion hole 28 having a smaller diameter than the shaft portion of the input shaft 23 and a larger diameter than the peripheral groove 27 of the input shaft 25 are provided in the central portion. , furthermore, both ends are the engagement ribs 1 of the lower frame 18.
3. Fold back up to the lower end of the hook portion 12 and fold the hook portion 12
Therefore, after the input shaft 23 is inserted into the insertion hole 26, its circumferential groove 27 is rotatably latched into the loose insertion hole 28, and The mounting plate 25 is fixed in the lower frame 8 by hooking its latching hole 29 to the hook portion 12, and the rotating shaft 23 is lowered with the rotating magnet 24 housed in the lower frame 8. The output shaft is loosely inserted into the output shaft mounting cylinder 11 through a shaft support hole 30 so as to be accommodated in the frame 8 . 31 is a pointer shaft; 32 is a vortex plate that is pivoted on the pointer shaft 31 so as to face the rotating magnet 24 with a gap therebetween;
Reference numeral 33 denotes a spiral spring having one end fixed to the pointer shaft 31, and the pointer shaft 31 has its tip end thin shaft portion 33a protruding from the shaft hole 34 of the upper frame 9 to the outside of the frame body 5, and its base end is connected to the rotating magnet. 24, and the other end of the spiral spring 33 is pivoted on the rotation center A of the upper frame 9.
It is inserted and locked into the small hole 21a.

The rotational output transmitted to the input shaft 23 causes the rotating magnet 24 to rotate, and the eddy current plate 3 accordingly rotates.
2 applies rotational force in the clockwise direction to the pointer shaft 31,
The pointer shaft 31 is rotated until it balances the biasing force of the spiral spring 33, and the pointer 6 indicates this rotational position.

(f) Effects of the invention As described above, the bicycle speedometer of this invention has the frame of the speedometer mechanism composed of an upper frame made of synthetic resin and a lower frame made of synthetic resin. The dimensional accuracy is better than that of the product to be processed, and high-precision products can be manufactured, and the elasticity of this synthetic resin can be used to perform integration work.Moreover, the engagement piece on the upper frame has a positioning protrusion on the lower frame. Since tapered side edges are provided to make it easier to fit between the upper frame and the lower frame, the upper frame can be integrated with the lower frame without shifting, making assembly work very easy. Further, according to the present invention, since the positioning protrusion provided on the lower frame reinforces the side wall of the lower frame, the frame can be made stronger.

[Brief explanation of the drawing]

The drawings all relate to an embodiment of the proposed bicycle speedometer, with Figure 1 being a vertical front view, Figure 2 being a vertical side view, and Figure 2 being a vertical side view.
FIG. 3 is an exploded perspective view of the main parts, FIG. 4 is a view of the frame, A is a perspective view in an exploded state, and B is a perspective view in an assembled state. 5... Frame body, 10... Base wall, 14a... Left side wall, 14b... Right side wall, 16, 17... Positioning protrusion, 8... Synthetic resin lower frame, 19... Engaging piece,
9...Synthetic resin upper frame, 22...Tapered side edges.

Claims (1)

[Scope of utility model registration request] In a frame that houses a rotating magnet or a vortex plate, the frame has a substantially cross-sectional shape with left and right side walls extending from the base wall, and the synthetic resin has positioning ridges on the front and rear edges of each side wall. It consists of a lower frame made of synthetic resin, and an upper frame made of synthetic resin having an engaging piece that fits between the protrusions on each of the side walls, and the engaging piece tapers to become narrower toward the free end. A bicycle speedometer characterized by having a shaped side edge.