JPS5819998Y2 - External gearbox on bicycle - Google Patents

Description

[Detailed description of the invention] This invention relates to an external transmission device for a bicycle.
An object of the present invention is to provide an external transmission for a bicycle that prevents loosening of a pair of adjustable adjustment bolts that regulate the swing angle of a cheno guide.

Generally, this type of external transmission device consists of a fixed body, a movable body equipped with a chain guide, and a unit that connects these fixed bodies and the movable body.
A pantograph mechanism is constructed from four members including a pair of parallel links, and the movable body is moved to a predetermined position by an operating mechanism such as a wire, and the wire guide is used to guide a ceno, while the pantograph mechanism is returned to the pantograph mechanism. In addition to providing a spring, a pair of adjustment bolts is provided on one of the four members constituting the pantograph mechanism, and these pair of adjustment bolts regulate the movement range of the movable body, and each adjustment A jig such as a screwdriver is engaged with the cut groove provided on the head of the bolt, and the threaded portion is moved forward and backward relative to the link into which each adjustment bolt is screwed, so that the range of movement is limited by the position of the tip. Allows changes to be made.

Therefore, unlike fixing bolts, each of the adjusting bolts is not completely tightened against a fixed wall or the like, so that they gradually loosen due to vibrations and other causes, and their adjustment positions often change.

However, in the past, in order to eliminate the above-mentioned drawbacks, a spring was interposed between the head of each adjustment bolt and a fixed wall to which the bolt was screwed, and the force of the spring was used to prevent loosening. It was.

However, in such a device, not only a spring is required, but the length of each adjustment bolt must be increased to accommodate the spring, and a spring receiving portion is formed in the head. However, there was a drawback that it was still impossible to completely prevent rotation.

Therefore, the present invention was devised to eliminate the above-mentioned drawbacks and ensure that each of the adjustment bolts is prevented from rotating with a simple structure. forming a stopper made of an elastic material having two through holes, and attaching the stopper to one of the four members to which each of the bolts is screwed;
It is characterized in that each of the bolts that are screwed into the member is fitted into each of the through holes of the stopper.

Hereinafter, embodiments of the external transmission device for the bicycle of the present invention will be described in detail based on the drawings.

10 is a fixed body attached to the fixed shaft; 12 and 13 are parallel links pivotally connected to the fixed body 10 via pins; 11;
is a moving body which is pivotally connected to each link 12.13 through a pin, and these four members constitute a pantograph mechanism, and one of the parallel links 12.13 has a pair of adjustment bolts 1, 2 is installed.

The movable body 11 is deviated in one direction as shown in FIG. 1 by the action of a spring (not shown), and this deviation position is regulated by one bolt 1 of the adjustment bolts 1, 20). It is.

Moreover, this movable body 11 is swung in the direction of arrow A against the above-mentioned spring from the deflected position by the operation of an operating mechanism (not shown) consisting of a wire or the like, and the movable body 1
1, the maximum movement range is regulated by another adjustment bolt 2.

Thus, as described above, the adjustment bolts 1 and 2 act as a stopper that limits the movement range of the moving body 11.
By adjusting these adjustment bolts 1 and 2, the limit on the movement range of the moving body 11 can be changed.

In the figure, reference numeral 14 denotes a mounting base for the adjustment bolts 1 and 2 fixed to the link 12, and has a pair of screw holes.

Further, 15 is a contact for the adjustment bolt 1 provided on the movable body 11, and 16 is a contact for the adjustment bolt 2 provided on the fixed body 10.

Further, although the drawing shows the case where the adjustment bolts 1 and 2 are attached to the link 12, the adjustment bolts 1 and 2 can be attached to any one of the fixed body 10, the link 12, 13, and the movable body 11 if they are one member. It may be a member of

Therefore, the present invention provides an external transmission device configured as described above, which is smaller than the outer diameter d1 of the male thread provided on the bolt 1.2 and slightly larger than the root diameter d1, as shown in FIGS. 4 and 5. A stopper piece 3 is formed with two through holes 3a, 3a having an inner diameter of 100.degree., and the stopper piece 3 is formed as shown in FIGS.
Adjustment bolts 1 and 2 are attached to the mounting base 14 and are screwed into the through holes 3a and 3a to be attached to the mounting base 14.

This stopper 3 is made of, for example, nylon, and the adjustment bolt 1,
It is made of a synthetic resin that is softer than the material of 2, and no screw grooves are formed in the through holes 3a, 3a.
Installation to the through hole 3a p3a is performed using the mounting base 1.
4, the adjustment bolts 1 and 2 are screwed into the through holes 3a,
This is done by fitting it into 3a and rotating it while screwing it forward.

That is, by rotating the adjustment bolts 1 and 2, the through hole 3
Since the inner walls of a and 3a are made of a softer material than the adjustment bolts 1 and 2, they deform plastically to receive the bolts 1 and 2, and when the rotation is stopped, the percentage of the material is reduced.
After being restored by FtE, the adjusting bolts 1 and 2 are firmly gripped by the second inner wall as shown in FIG.

In this way, the adjustment bolts 1 and 2 are fixed at the adjusted positions, and relative rotation with the stopper piece 3 is reliably prevented.

Also, this stopper piece 3 is provided with two through holes 3a, 3a,
Two adjustment bolts 1 are installed in each through hole 3a, 3a as described above.
, 2 will be attached, the rotation of the locking piece 3 will be prevented by the fixing means consisting of the bolts 1 and 2 in parallel, so that the adjustment bolts 1 and 2 will be mutually attached to the mounting base 14. Adjustment bolt 1, which can prevent rotation.
2 will remain fixed unless it is forcibly rotated.

However, the adjustment of the adjustment bolts 1 and 2 of the lever is
This can be easily done by forcibly rotating it using a jig such as a screwdriver, and it is fixed again after adjustment.

Further, as described above, the size and thickness of the stopper 3 attached to the adjustment bolts 1 and 2 are not particularly limited, but the thickness should be such that the adjustment bolts 1 and 2 can be fixed, for example, the screw 2.
The thickness is equivalent to ~3 pitches).

Further, the stopper piece 3 may be attached to one side of the mounting base 14 instead of being attached to the middle part of the mounting base 14 having a double-shaped cross section as shown in FIG.

As described above, the present invention forms a stop piece made of an elastic material having two through holes smaller than the outer diameter of the thread of the adjustment bolt and larger than the root diameter, and the stop piece is connected to each of the bolts. The bolts are attached to one of the intermediate members to be screwed together, and each of the bolts to be screwed to the member is fitted into each through hole of the stopper, so the structure is extremely simple. Despite the structure, it has become possible to reliably prevent the adjusting bolt from loosening due to vibration, etc., and it has become possible to always hold the bolt in the adjusted position.

In addition, by fitting a pair of adjustment bolts into one stop piece, the stop piece can be prevented from rotating by restraining the bolts from each other. There is no need to provide any structure.

Furthermore, since the length requires a stop piece, and this stop piece can be thin, the length of the bolt is shorter than when using a conventional spring, and a flange is formed on the head to receive the spring. There is no need to do so.

Therefore, the adjusting bolt also has the advantage of being simple in structure and compact, and having less protrusion from the transmission to the outside.

In addition, since this stopper is made of synthetic resin, it can be mass-produced by molding, and the inner diameter of the through hole does not have to be formed with great precision, so it can be provided at a low cost. Since no processing is required on the fixed wall portion, it has the advantage that it can be easily applied to existing wall portions.

[Brief explanation of drawings]

Fig. 1 is a partially omitted bottom view showing an embodiment of the device of the present invention, Fig. 2 is an enlarged front view of the section viewed from arrow A in Fig. 1, and Fig. 3 is Fig. 2 I.
[An enlarged sectional view taken along line 1-1, FIG. 4 is a plan view of only the stopper, and FIG. 5 is a sectional view taken along line v--v in FIG. 1.2...adjustment bolt, 3...stop piece,
3a...Through hole, 10...Fixed body, 1
1...Moving body, 11a...Chain guide, 12, 13...Parallel link.

Claims (1)

[Scope of utility model registration request] It consists of four members: a fixed body and a movable body equipped with l pairs of parallel links and a chino guide, and one of these four members has a pair of adjustment bolts for regulating the movement range of the movable body. An external transmission device for a bicycle, which is screwed together in a parallel manner, and a stop piece made of an elastic material is formed with two through holes whose diameter is smaller than the outer diameter of the screw in the adjustment bolt and larger than the root diameter. Then, the stop piece is attached to one of the four members to which each of the bolts is screwed, and the bolt to be screwed to the member is fitted into each through hole of the stop piece. An external transmission device for a bicycle characterized by: