JPS5824314B2 - How to use the digital camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gear engagement/disengagement device for a bicycle, which is provided with a mechanism for displacing the gear in a lateral direction with respect to the rear wheel of the bicycle.

As the displacement mechanism, for example, a jack disposed at right angles to the rear wheel of the bicycle or inclined at a certain angle, or a parallelogram link disposed in a plane parallel to the axis of the rear wheel is used, and the structure of the mechanism is as follows: One of the elements is integral with the frame of the bicycle, and in a direction perpendicular to the axis of the rear wheel there is a further parallelogram link, one or more of the latter parallelogram links. The portion is configured to act as a support member for a shaft supporting a clamping member on which a chain guide pulley and a chain tension control pulley are mounted.

Traditionally known bicycle gear disengagement systems usually use two parallelogram links, one of which acts as a support for the chain guide pulley, and the other on the rear wheel side. It was configured to act to laterally displace the pulley along a conical shape formed by all the transmission gears.

Therefore, the first parallelogram link ensures that the chain guide pulley is displaced parallel to the axis of the bicycle rear wheel or at an angle, and that this displacement changes the chain from one gear to another, while the second parallel A quadrilateral link displaces the chain guide pulley perpendicular to the rear wheel axis, thereby increasing the distance from the rear wheel to the guide pulley axis in such a way that the guide pulley is always in the immediate vicinity of said gear. can be changed so that it is a function of .

Of course, instead of the first parallelogram link it is also possible to use a jack as the lateral displacement mechanism.

In this case, the jack is placed near the transmission gear so that its axis is parallel to the axis of the transmission gear group or to the generatrix of the cone formed by the gear group.

Known gear engagement and disengagement devices for bicycles of this kind have a structure in which the rigidity of the device for ensuring the connection between the lateral displacement mechanism and the second parallelogram link is sufficient for all transmission gears. However, it did not escape the disadvantage that it could not be operated with high precision.

In certain known devices, only one connecting screw is used to connect the two sides belonging to the first and second links, so that in the connecting position the tension of the chain and the There is a drawback that deflection occurs due to the action of various springs, which is contradictory to the force for stably and accurately positioning the chain guide pulley.

It is an object of the present invention that the lateral displacement mechanism and the support parallelogram link are completely fixed in their relative positions with respect to each other, in other words, in the area where they are connected, there is no relative movement or movement of each member. It is an object of the present invention to provide a gear engagement/disengagement device which does not cause deformation of the gear and which does not cause such inconvenience even when there is a force in the pivoting portions of the two that would cause them to separate from each other. .

The present invention comprises a first portion fixed to a bicycle frame and a second portion movable laterally with respect to a plane including a rear wheel of the bicycle.
a displacement mechanism, a support parallelogram link arranged in a plane perpendicular to the bicycle rear wheel axis, and a shaft supported by the link.

a chain guide pulley mounted on the shaft, a clamping member provided on the link, a chain tension control pulley mounted on the clamping member, a second portion of the displacement mechanism, and one side of the link. The gist is that it consists of a rigid connecting member that connects the

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

The present invention basically relates to a mechanism for engaging and disengaging gears in a bicycle transmission mechanism, and as mentioned above, the elements of the lateral displacement mechanism are the elements facing the side fixed to the frame, and the parallel elements for support. one of the sides of the quadrilateral link comprises a rigid section having at least two pivots thereon, each pivot forming an opposite end of one side of the supporting parallelogram link; This provides an engaging and disengaging mechanism.

A first feature of the invention is that a rigidly connected part is assigned to both the lateral displacement mechanism and the support parallelogram link.

This prevents the possibility of any movement between the two, and also prevents the mechanism itself from flexing due to the fact that the mechanism as a whole is extremely long, thin, and has a baby-boom-like shape. Therefore, it is possible to provide a device that is extremely unlikely to be twisted.

As shown in the accompanying drawings, particularly in FIG. 1, the locking and disengaging mechanism according to the present invention has a first side fixed to the frame of the bicycle (not shown) in order to displace the bicycle rear wheel in the lateral direction. It has a first parallelogram link 1 constituted by a pivot shaft mounting member 1a which is a section.

The other two opposing sides of the parallelogram link are comprised of two parallel arms 1b and 1c pivotally attached to the pivot 1d of the pivot shaft attachment member.

The first parallelogram link 1 is arranged obliquely with respect to a plane parallel to the axis 2 of the rear wheel of the bicycle.

As can be seen in FIGS. 2 and 3, the device according to the invention further comprises a second parallelogram link 3. As can be seen in FIGS.

This link has three sides 3a, 3b and 3c which are pivoted to each other by two pivots 3d and 3e, and this link is arranged in a plane perpendicular to the axis 2 of the rear wheel of the bicycle. There is.

This device further includes a member 4 for connecting the two links to each other.
is arranged.

In a first embodiment of the invention, said member 4 has a V-shaped bracket 4a with two ears 4b, 4c.

This bracket consists of two parallel side plates 4d forming a U-shape.
, 4e, and these side plates are connected by a substrate 4f in a direction perpendicular thereto.

Holes 4g and 4h are formed in both side plates 4d and 4e, respectively, and these holes 4g and 4h are aligned with corresponding holes in the other side plate, and a pin 5 is inserted into each pair of holes. It has become so.

A hole is formed at the end of each arm 1b, 1c of the first link 1 at a position aligned with the hole 4g, 4h of the side plate, and a pin 5 is attached to each arm 1b.

1c is held between the side plates and passes through them.

The aforementioned two pivots 1d and the two pins 5 form the four vertices of the first parallelogram link 1.

One end of the pin 5 is attached to the side plates 4d, 4c, which holds the pin firmly, and the side plates 4d, 4c.
The space between the arms 1b and c is such that the arms 1b,
It is selected to maintain the axial clearance of lc.

Both ear parts 4b and 4c of the fixing member 4 are both side plates 4d.

4e, in other words perpendicular to the plane containing the first parallelogram ring 1.

Furthermore, these both ear parts 4b. 4c is formed integrally with one of the side plates 4d and 4e of the bracket 4a.

Also, holes 41 are formed in both ear parts 4b and 4c,
Pins 6 are fitted into these through holes.

The direction of these pins is perpendicular to the plane containing the ears 4b, 4c, in other words parallel to the axis 2 of the rear wheel of the bicycle.

Said pin 6 is pivotally connected to the arms 3a, 3b constituting the second parallelogram link 3 and forms the apex of said link.

The device of the invention further includes two
Holding member 11 formed by side plates 11a11b
A guide pulley 7 and a tension control pulley 8 are mounted on the shaft 9 and the other shaft 10, respectively.

The shaft 9 is inserted into the pivot hole 3d of the second link 3 and supports one of the arms of the link, in this case 3a.

A flange portion 3f is formed on the arm 3a of the second parallelogram link 3, and the flange is connected to the clamping member 1.
The movable range of the link around the shaft 9 is limited by engaging with the rear part 11c and the upper part 11e of the side plate 11a of No. 1.

The clamping member 11 is biased rearwardly by means of a pulley 8 provided thereon in order to maintain tension on the chain (not shown).

This biasing action is achieved by winding the shaft 9, one end 12a of which engages with an engaging portion 11d provided on the side plate 11a, and the other end 12b with a flange 3g provided on the arm 3b of the second link 3. This is done by a coil spring 12 engaged with the arm 3b, and by this biasing action the arm 3b is always biased in the direction of the arrow 13 in FIG.

As a result, the holding member 11, which includes the second parallelogram link 3 and the pulley 8, is biased in the opposite direction of rotation compared to when in use, and is constantly brought to the maximum height and the farthest position from the bicycle. ing.

The arm 3b of the second parallelogram link 3 is further provided with a flange 3h, which engages with a portion 31 of the other arm 3a of the second parallelogram link 3 and is connected to the spring 12.
The deformation of the link due to the biasing action in the direction of arrow 13 is limited.

The operation of the bicycle gear engagement and disengagement device according to the present invention as described above is substantially the same as that of known devices.

However, as is clear from the configuration described above, considering the position where the member 4 is attached, the member 4 constitutes the opposite side of the side 1a of the first link 1 on one side, and on the other side. A pivot shaft mounting member 1a fixed to the bicycle frame has two lights forming opposite sides of the side 3b of the second link 3.
The position of the member 4 relative to the
constitutes a complete and stable base supporting the second parallelogram link 3 on which the clamping member 11 supporting the guide pulley 7 and the tension control pulley 8 is mounted.

Furthermore, in order to further increase the rigidity, the links can be formed with articulated pivots in certain parts, in particular in the aforementioned arm 3a carrying the pin 6. .

The connecting member 40 shown in FIGS. 4 and 5 corresponds to the member 4 shown in FIG.

This connecting member 40 is arranged between the parallelogram link 3 and the lateral displacement mechanism jack 20 in this embodiment.

The cylinder 21 of the jack 20 is firmly fixed to a bicycle frame (not shown), for example, by a support arm 22 or the like.

The jack 20 has a rod 23 inside its cylinder 21, which has a rectangular cross section, for example, and has one end protruding from an opening of the same shape provided in the cylinder, and has a bearing plate 24 attached to the other end 23a. .

A return spring 25 is further disposed in the cylinder to surround the rod 23, and one end of the spring 25 abuts against the front end 21a of the cylinder 21, and the other end abuts against the bearing plate 24.

The cylinder 2 is located on the opposite side of the bearing plate 24 from the rod 23.
The tip of the control lever 26 extends into the cylinder through an axially extending slit 21b provided in the cylinder 1 and is pivoted by a pin 27 to a support member 28 attached to the cylinder. are in contact with each other.

A guide groove 26a for guiding a control cable 29 is formed on the outer periphery of the control lever 26, and one end of the cable is screwed to the outer end 26b of the lever 26.

The cable 29 passes through an opening 30a of a stopper 30 attached to the cylinder 21 on the opposite side from the slit 21b.

The stopper 30 is a sheath member 3 surrounding the cable 29.
This is to hold the end of 1.

A connecting member 40 is attached to the outer end 23b of the rod 23, the connecting member 40 having a recess corresponding to the cross-sectional shape of a rond on its side surface.

The connecting member 40 may be connected by brazing or by connecting the member 40 and the rod 2.
It is firmly fixed to the outer end 23b of the rod by a hole provided in the end surface of the rod 3 and a means such as a pin or a rivet.

It is convenient to form the connecting member 40 by cutting a metal plate into a suitable shape and then bending the metal plate to leave an opening on one side into which the rod outer end 23b is inserted.

The connecting member 40 further includes two ears 4b included in a plane perpendicular to or inclined to the axis of the rod 23;
4c is provided.

A hole 41 that engages with the pin 6 of the parallelogram link 3 is provided near the tip of each ear.

In the embodiment shown in Figures 1 to 3, the parallelogram link 3 has three arms 3a, 3b and 3c, arm 3a on the ear 4b, arm 3d on the ear 4c,
Arm 3b is pivotally connected to arms 3a and 3c, respectively.

The holding member 11 and the guide pulley 7 are mounted on a pin 6 that connects the arms 3a and 3b.

It is believed that it is easy to understand that the embodiments described above can be modified in various ways within the scope of the invention.

In addition, the embodiments of the present invention are listed below.

(1) A bicycle gear engagement/disengagement device according to claim 1, wherein the rotatable holding member is supported by a shaft supported by a parallelogram link.

(2) The bicycle gear engagement/disengagement device according to claim 1, wherein the displacement mechanism includes a parallelogram link.

(3) The first part is two of the parallelogram links of the displacement mechanism.
The bicycle gear mechanism according to item 2, comprising a first pair of pivots connected to two opposite sides of the parallelogram link and a second pair of pivots connected to two opposite sides of the parallelogram link. Detachment device.

(4) The pivot points in one of the first and second pairs are parallel to each other and perpendicular to the parallelogram link to which they are connected. (
3) Bicycle gear engagement/disengagement device described in section 3).

(5) Clause (3) above, wherein both pivot points in both pairs of pivot points are mutually parallel and perpendicular to the parallelogram link on which they are mounted. The described bicycle gear engagement/disengagement device.

(6) the above-mentioned (5), wherein both pivot joints in the first pair of pivot joints are at right angles to both pivot joints in the second pair;
Bicycle gear engagement and disengagement device as described in .

(Force The connecting member is the opposing 2 parallelogram links of the displacement mechanism.
It is provided with a V-shaped bracket that receives two parallel arms forming the sides, and two side plates for holding the bracket are formed in a V-shape, and a parallelogram link of the displacement mechanism. and is further pivotally connected to each of the two parallel arms by the first pivoting part, thereby firmly supporting each end of the pivoting part and supporting the pivoting part. 6. The bicycle gear engagement and disengagement device according to item (6), wherein the axial movement of the parallel arm at the portion is limited.

(8) The connecting member is provided with two ears formed integrally with one of the side plates of the bracket and in a plane perpendicular to the side plate, the ears having a parallelogram link. One of the pair of pivot points of is penetrated,
On the other hand, in the bicycle gear engagement/disengagement device described in the above-mentioned item (force), the ear portion constitutes a bearing.

(9) The bicycle gear engagement and disengagement device according to item (1), wherein the shaft is a pin at one vertex of a parallelogram link on the side remote from the connecting member.

(10) Wound around the shaft, one end of which is engaged with one side plate of the clamping member and the other end of which is engaged with one side of the parallelogram link to operate the chain guide pulley and the parallelogram link. The bicycle gear engagement/disengagement device according to item (1) above, wherein the gear engagement/disengagement device is biased in a direction opposite to the above.

(11) The bicycle gear engagement and disengagement device according to item (1) above, wherein at least one side of the parallelogram link is provided with a flange that engages with the bracket to limit lateral displacement of the bracket.

(12) A description of item (1) above, wherein at least one of the sides of the parallelogram is provided with a flange that engages with another side of the link to limit lateral displacement of the parallelogram link. Bicycle gear engagement/disengagement device.

[Brief explanation of the drawing]

FIG. 1 shows a first gear engagement/disengagement device for a bicycle according to the present invention.
FIG. 2 is an exploded perspective view showing a part of the apparatus shown in FIG. 1, FIG. 3 is a partial perspective view as seen from the direction between the arrows in FIG. 5 is a perspective view showing the connecting member of the second embodiment, and FIG. 5 is a partially cutaway view of the device including the connecting member shown in FIG. 4, showing both the jack as the displacement member and the parallelogram link. FIG. In the figure, numeral 1...first parallelogram link, 2...
Bicycle rear wheel axis, 3...second parallel-quadrant link, 4
... Rigid connecting member, 5, 6... Pin, 7...
Guide pulley, 8... Tension control pulley, 9... Shaft, 1
0... Support shaft, 11... Holding member, 12... Coil spring, 20... Jack, 21... Cylinder, 23... Rod, 24... Bearing plate, 25... Return spring, 26... lever, 27... pin, 2
8... Support member, 29... Cable, 30... Stopper, 40... Connection member.

Claims (1)

[Claims] 1. A displacement mechanism comprising a first part fixed to the bicycle frame, a second part displaceable in a transverse direction with respect to the bicycle rear wheel surface, and a parallelogram in a plane perpendicular to the bicycle rear wheel axis. a shaped link, a shaft supported by the link, a chain guide pulley mounted on the shaft, a rotatable holding member on the link, and a chain tensioner stored and mounted within the member. A bicycle gear engagement/disengagement device comprising: a control pulley; and a connecting member constituting a second portion of the displacement mechanism and forming one side of the parallelogram link.