TWI616374B - Bicycle mode chain use mode switching mechanism - Google Patents

Abstract

The utility model relates to a use mode switching mechanism of a bicycle derailleur, which has a body and an outer cover which are covered, and a positioning component and a switch component are accommodated in an inner space of the body and the outer cover. The positioning assembly has a ratchet, at least one positioning pawl and at least one elastic member, the switch assembly includes a bracket and a control member, wherein the bracket is positioned between the outer cover and the positioning assembly, and the control member is slidably disposed on the bracket and the positioning assembly And a plurality of spaced apart at least one stop is disposed adjacent to or away from the moving path of the positioning pawls; wherein the ratchet is provided with a plurality of annular ratchets arranged at equal intervals, and the positioning pawl is provided with meshing teeth To engage the ratchet.

Description

Bicycle mode chain use mode switching mechanism

The present invention relates to a bicycle derailleur, and more particularly to a bicycle derailleur that can switch the mode of use of the chain guide.

The conventional bicycle derailleur, as described in the new patent No. M481882, is mainly composed of a base, a link mechanism and a chain guide, and the base is fixed on the frame of the bicycle. The link mechanism is coupled to the base and is configured to drive the chain guide to swing relative to the base, and the swing axis direction of the chain guide intersects with the traveling direction of the bicycle, thereby guiding the bicycle chain to the sprocket of different teeth. Up, achieve the effect of shifting, and provide the proper tension of the chain to ensure smooth operation.

In order to stabilize the chain for accurate shifting, a one-way resistance mechanism is usually added to the chain guide. However, this mechanism does not have a design for the relevant switching, thus causing inconvenience in use, in US No. 8,870,692. The invention discloses a bicycle derailleur which is provided with a control rod at a link mechanism and exerts different resistance to the rotation of the chain guide by switching the control rod at the first position and the second position, even though The lever still does not have the effect of allowing the link mechanism to produce a two-way rotation relative to the chain guide, so there is still room for improvement.

It is an object of the present invention to provide a use mode switching mechanism for a bicycle derailleur that allows a user to quickly switch the mode of use of the chain guide.

To this end, the present invention provides a use mode switching mechanism of a bicycle derailleur, which has a body and a cover, a positioning component and a switch component are accommodated in the inner space of the body and the outer cover, wherein the top surface of the body is provided with a receiving groove and pivoted to the shaft of a chain guide The positioning component has a ratchet capable of synchronously pivoting with the rotating shaft, at least one positioning pawl adjacent to the ratchet and relatively close to or away from the ratchet, and at least An elastic member for applying an elastic force toward the ratchet to the positioning pawl; the switch assembly includes a bracket and a control member, wherein the bracket is positioned between the outer cover and the positioning assembly, and the control member is Slidably disposed between the bracket and the positioning assembly, and at least one of the spaced apart at least one stop is disposed adjacent to or away from the moving path of the positioning pawl; wherein the ratchet is provided with a plurality of annularly spaced intervals Each of the positioning pawls is provided with a meshing tooth for engaging one of the ratchets.

Thereby, the user can adjust the position of the control member to move the stopper of the control member away from the moving path of the positioning pawls, so that the positioning pawls can freely move to perform their functions normally, or the control member The stops are located on the path of movement of the positioning pawls such that the positioning pawls are constrained in the receiving apertures, at which point the chain guides can be bi-directionally rotated relative to the body.

1‧‧‧ clutch unit

2‧‧‧Chain guides

2a‧‧‧ reel

2b‧‧‧ screw holes

10‧‧‧ Ontology

11‧‧‧ accommodating slots

20‧‧‧ Positioning components

21‧‧‧ ratchet

21a‧‧‧ ratchet

22‧‧‧Carry

23‧‧‧ accommodating holes

24‧‧‧Locating the pawl

24a‧‧‧Meshing teeth

25‧‧‧Fixed tablets

26‧‧‧Flexible parts

30‧‧‧ Pressurized components

31‧‧‧shims group

32‧‧‧ Plate-shaped shrapnel

33‧‧‧ collar

34‧‧‧Adjustment bolts

40‧‧‧ Cover

41‧‧‧ openings

50‧‧‧Switch components

51‧‧‧ bracket

51a‧‧‧ slot

52‧‧‧Controls

53‧‧‧ board

54‧‧‧ rod body

55‧‧‧ block

60‧‧‧Toggle button

θ, θ 1, θ 2, θ 3‧‧‧ angle

1 is a perspective view of a clutch unit of a bicycle derailleur according to a preferred embodiment of the present invention; FIG. 2 is an exploded view of a clutch unit of a bicycle derailleur according to a preferred embodiment of the present invention; and FIG. 3 is a perspective view of FIG. 3 is a cross-sectional view of a ratchet and a positioning ratchet according to a preferred embodiment of the present invention; and FIG. 5 is an exploded perspective view of the switch assembly and the positioning ratchet according to a preferred embodiment of the present invention.

1 to 3, a clutch unit 1 for a bicycle derailleur is provided between a chain guide 2 and a link mechanism (not shown), and the clutch unit 1 is provided in the preferred embodiment of the present invention. package A body 10, a positioning component 20, a pressurizing component 30 and an outer cover 40 are disposed on the body 10 to enclose the positioning component 20 and the pressurizing component 30 in the inner space of the body 10 and the outer cover 40.

The body 10 is provided with a receiving groove 11 in a hollow cylindrical shape and away from the chain guide 2, so that the rotating shaft 2a of the chain guide 2 can penetrate the body 10 and protrude from the center of the bottom of the receiving groove 11. Therefore, the body 10 is pivotally coupled to the chain guide 2 so as to be rotatable relative to each other. Further, the following description is performed by the direction in which the above-mentioned rotating shaft 2a protrudes from the receiving groove 11 as the upper direction.

The positioning assembly 20 has a ratchet 21 pivotally connected to the receiving groove 11 with the rotating shaft 2a as a center, and rotates synchronously with the rotating shaft 2a, and the circumferential surface of the ratchet 21 is provided with a plurality of ratchet teeth 21a arranged at equal intervals in an annular shape; The frame 22 is fixed to the body 10 on both sides and adjacent to the circumferential surface of the ratchet 21; at least one positioning pawl 24 (four in this embodiment) is linearly slidably disposed in the at least one receiving hole 23 of the retainer 22. (in this embodiment, also four), and one end of each positioning pawl 24 relatively close to the ratchet 21 is provided with engaging teeth 24a for engaging with the ratchet teeth 21a of the ratchet 21; a fixing piece 25 is locked to the cage 22 above all of the accommodating holes 23; and at least one elastic member 26, which is a compression spring in the present embodiment and has four numbers, respectively, with its both ends abutting between the positioning pawl 24 and the cage 22, The elastic force toward the ratchet 21 is applied to the positioning pawl 24. Further, each of the ratchet teeth 21a is formed by an inclined surface and an upright stop surface, so that the ratchet 21 can only be rotated in one direction by the engagement of the positioning pawl 24 with the ratchet teeth 21a. In addition, it is worth mentioning that the positioning pawl 24, the receiving hole 23 and the elastic member 26 only need one, and the bicycle derailleur can be activated. Can be achieved.

Referring to Fig. 4, in the present embodiment, the circumferential surface of the ratchet 21 is provided with 24 ratchet teeth 21a, so that the angle θ between the ratchet teeth 21a and the center of the ratchet 21 is 15 degrees. In order to achieve the purpose of improving the accuracy, the positioning pawl 24, the accommodating hole 23 and the elastic member 26 need to be provided in plural numbers. In this embodiment, the meshing teeth 24a and the ratchet of the two adjacent positioning pawls 24 are provided. Angles θ 1 and θ 2 of the center of 21 (ie, the center of the shaft 2a) And θ 3 are respectively arranged at an angular interval of θ 1 = θ 2 = θ 3 = 33.75 degrees (i.e., 360 / 24 * 2 + (360 / 24) / 4, where N = 2). By setting the position of the positioning pawl, the rotation accuracy of the positioning assembly 20 can be increased from the original 15 degrees to 3.75 degrees, that is, 4 times.

In other words, it is assumed that the top surface of the ratchet 21 is provided with X ratchets 21a, in the case of having Y positioning pawls 24 (where X is a positive integer greater than 2, and Y is a positive integer greater than or equal to 2), if The positioning pawls 24 are arranged at equal angular intervals, and the accuracy of the positioning assembly 20 is only Δ=360/X degrees; if the positioning pawls 24 are arranged at equal angular intervals by the above formula, that is, two adjacent positioning pawls 24 and When the angle between the centers of the ratchets 21 is set to Δ degree * N plus (Δ / Y) degrees, the rotation accuracy of the positioning assembly 20 will be increased to Δ / Y degrees, which can be greatly improved!

In detail, the positioning pawl does not simultaneously mesh with the ratchet teeth of the ratchet. In the present embodiment, the positioning pawls 24 are in turn engaged with the ratchet 21, so that there is only one positioning ratchet 24 at a time. The engaging teeth 24a are engaged with a ratchet 21a of the ratchet 21, and when the ratchet is rotated again (360/X)/Y degrees, there is another engaging tooth 24a of the positioning pawl 24 and the other ratchet 21a of the ratchet 21 The meshing, that is, the rotation accuracy of the rotating shaft 2a is surely increased to (360/X)/Y degrees. If necessary, those skilled in the art may also make some fine adjustments of θ 1 , θ 2, and θ 3 such that θ 1 ≠ θ 2 ≠ θ 3 , which will result in different precisions.

Referring to FIGS. 1 and 2 again, the pressurizing assembly 30 is provided with two spacer sets 31 for clamping the ratchet 21, a pair of plate-like elastic pieces 32 and a set of rings 33 are simultaneously sleeved on the rotating shaft 2a, and an adjusting bolt 34 is locked. A screw hole 2b that is fitted to the top surface of the rotating shaft 2a. Wherein, the plate-shaped elastic piece 32 abuts against the top surface of the gasket group 31 and the bottom surface of the collar 33 with both ends thereof, and the user can move the collar 33 upward or downward by rotating the screwing depth of the adjusting bolt 34. Then, the downward pressure applied to the spacer 31 by the plate-like elastic piece 32 is changed to achieve the resistance of the adjustment positioning assembly 20 applied to the rotating shaft 2a and the chain guide 2.

Thereby, since the positioning pawl 24 is arranged at an equiangular interval arranged by calculation The column can easily improve the rotation accuracy of the chain guide 2 with the same number of components. In addition, the ratchet teeth can also be placed on the circumferential surface of the ratchet, and the positioning pawls can still be arranged at equal angular intervals to improve accuracy.

In addition, referring to the figures 2, 4, and 5, the clutch unit 1 further includes a switch assembly 50 including a bracket 51 and a control member 52, wherein the bracket 51 is positioned on the outer cover 40 and the fixed piece 25. And a slot 51a is formed. The control member 52 is formed by integrally forming a plate body 53 with a rod body 54. The plate body 53 is slidably disposed between the bracket 51 and the fixing piece 25, and Four spaced-apart stops 55 (as shown in FIG. 5) are protruded downward; the rod 54 passes upward through the slot 51a and the opening 41 of the outer cover 40, so that one end of the rod 54 can be connected with a toggle Key 60. Therefore, the user can use the hand to push the toggle button 60 to cause the control member 52 to be displaced along the slot 51a. When the control member 52 is at one end of the slot 51a, the stop 55 will not be in the moving path of the positioning pawl 24. The positioning pawls 24 are freely movable to function normally (as shown in FIG. 4), but when the control member 52 is located at the other end of the slot 51a, the aforementioned stop 55 will be located at the movement of the positioning pawl 24. The path blocks the positioning pawls 24 from being constrained into the receiving apertures 23, at which point the chain guide 2 will be capable of bi-directional rotation relative to the body 10. In addition, it should be additionally noted that the number of the stoppers 55 can be adjusted according to the number of the positioning pawls 24, for example, when the number of the positioning pawls 24 is one, the number of the stoppers 55 need only be one. It is possible to achieve the effect of switching the action mode.

In summary, the present invention and its specific embodiments are not limited to the above examples.

Claims (7)

A use mode switching mechanism for a bicycle derailleur includes: a body having a receiving groove on a top surface thereof and pivotally connected to a rotating shaft, the rotating shaft protruding from a bottom of the receiving groove; a positioning component having A ratchet wheel is pivotally connected to the accommodating groove and rotates synchronously with the rotating shaft, at least one positioning pawl is adjacent to the ratchet wheel and can be relatively close to or away from the ratchet wheel, and at least one elastic member for applying an elastic force toward the ratchet wheel Providing the positioning pawl; an outer cover covering the body; and a switch assembly including a bracket and a control member, wherein the bracket is positioned between the outer cover and the positioning assembly, the control member is slidable Positioned between the bracket and the positioning assembly, and at least one of the spaced apart spacers is disposed adjacent to or away from the moving path of the positioning pawls; wherein the ratchet is provided with a plurality of annularly spaced intervals The ratchet teeth, each of the positioning pawls is provided with a meshing tooth for engaging one of the ratchet teeth. The use mode switching mechanism of the bicycle derailleur according to claim 1, further comprising a pressing component disposed between the body and the outer cover to apply resistance to the ratchet. The use mode switching mechanism of the bicycle derailleur according to claim 2, wherein the ratchet spacing is disposed on a circumferential surface of the ratchet, the positioning assembly further has a retainer locked to the body and adjacent to the ratchet, The positioning pawl is slidably disposed in the at least one receiving hole of the holder, and each of the elastic members is disposed in one of the receiving holes. The use mode switching mechanism of the bicycle derailleur according to claim 3, wherein the positioning component further has a fixing piece locked to the holder and covering the receiving holes, the elastic members are at both ends thereof The top is between the positioning pawl and the cage. The use mode switching mechanism of the bicycle derailleur according to claim 4, wherein the bracket is positioned between the outer cover and the fixing piece, and the control member is slidably disposed between the bracket and the fixing piece. The use mode switching mechanism of the bicycle derailleur according to claim 1, wherein the bracket is provided with a slot, the control member is composed of a rod body and a plate body, and the rod body passes through the slot and the outer cover. The stops are formed by the protrusion of the plate body. The use mode switching mechanism of the bicycle derailleur according to claim 6, wherein one end of the rod protruding from the outer cover is connected to a toggle button.