JPS6231350Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an inner wire attachment device in a lever device.

To explain a conventionally well-known brake lever device, for example, one for bicycles, Fig. 1 and Fig. 2 show an example.
In the brake lever device B shown in the figure, reference numeral 1 denotes a housing manufactured by forging a light alloy, and its base portion is fastened and fixed to a handlebar 2 via a band 3. A holder 4 is inserted into the tip of the housing 1 from the outside. Reference numeral 5 denotes a Bowden wire, which is composed of a cylindrical outer wire 6 and an inner wire 7 inserted into the outer wire 6, and the end of the outer wire 6 is supported by the holder 4.
An inner wire 7 is inserted into the housing 1 from a holder 4, and a nipple 8 having a circular cross section is fixed to the insertion end of the inner wire 7. 9 is the brake lever, which is forged from light alloy and formed into a roughly L-shape.
The proximal end is inserted into the housing 1 and is rotatably connected via a pivot shaft 10. This brake lever 9 is formed into a bifurcated shape in the thickness direction near the L-shaped bent part, so that the inner wire 7 can be inserted between the pair of forked pieces 11, and penetrates through the front and back of the pair of forked pieces 11. A locking hole 12 is formed to fit the nipple 8, and a groove 13 is provided extending from the periphery of the locking hole 12 to the outer periphery of one of the forked pieces 11. Therefore, the end of the inner wire 7 is inserted into the groove 13.
The locking hole 1 is opened from the distance between the pair of forked pieces 11 via the
2 and insert the nipple 8 into the locking hole 12 so that the inner wire 7 is attached to the brake lever 9. When the brake lever 9 is rotated about the pivot 10 in the direction of the handlebar 2, the outer wire 6 is attached to the brake lever 9. The inner wire 7 is pulled against the
A brake device (not shown) attached to the other end of the Bowden wire 5 is activated.

In the conventional brake lever device B mentioned above,
The nipple 8 is designed to be fitted for rotation within the locking hole 12. However, in reality, the nipple 8 and the brake lever 9 are manufactured by casting or forging a light alloy, and the locking hole 12 is punched out using a press, so the contact surface of the locking hole 12 with the nipple 8 is a rough surface. It has been found that the nipple 8 does not rotate smoothly inside the locking hole 12. This causes the end of the inner wire 7 to be bent at the outer surface of the nipple 8 as shown in the second figure when the brake lever 9 is rotated, and the bent portion 14 of the inner wire 7 becomes fatigued due to repeated brake operations. This poses a risk of being severed. Particularly in the case of inner wires for bicycle brakes, it has been found that almost all accidents caused by inner wire breakage are caused by the bent portion 14. To solve this problem, there is an inner wire 7 attachment device filed by the present applicant (Japanese Utility Model Publication No. 16788/1988). This is because, as shown in FIG. 3, the nipple 8 is formed into a circular cross section with an outer diameter slightly smaller than the locking hole 12, and a fixing hole 1 having two diameters, large and small, in the diameter direction of the nipple 8.
5 is opened, and the different diameter stepped portion of the fixing hole 15 is provided with a
A fixing element 16 fixed to the end of the inner wire 7 is inserted into engagement, thereby fixing the end of the inner wire 7 to the nipple 8. A bushing 17 is made of a wear-resistant synthetic resin, preferably nylon resin, and has a cylindrical shape, and is inserted between the nipple 8 and the locking hole 12. The bushing 17 has flanges 18, 18 integrally formed on the periphery of both ends, and a dividing groove 19 extending over the entire width direction to partially separate the circumferential surface of the bushing 17.
A guide groove 21 is provided at the center of the split groove 19 and is perpendicular to the split groove 19. The guide groove 21 is made wider than the outer diameter of the inner wire 7, the split groove 19 is made narrower than the outer diameter of the wire 7, and the outer diameter D of the bushing 17 is made larger than the inner diameter of the locking hole 12. When the bush 17 is contracted through the groove 19, it can be inserted into the locking hole 12,
On the other hand, the inner diameter d of the bushing 17 is slightly larger than the outer diameter of the nipple 8. Therefore, when the inner wire 7 is inserted into the guide groove 21 through the split groove 19 and the nipple 8 is inserted into the bush 17, and the bush 17 is contracted and inserted into the locking hole 12, the bush 17 is expanded. It is in close contact with the locking hole 12, and both flanges 18 are supported on the outside of the forked piece 11. When the brake lever 9 is rotated, the nipple 8 smoothly rotates on the inner surface of the bush 17 and the inner wire 7
is never bent.

However, in the above-mentioned inner wire 7 attachment device, the shape of the bush 17 is relatively complicated, so the manufacturing cost is high, and assembly is labor-intensive.
It has been desired to reduce costs by simply preventing bending of the inner wire 7. The present invention was devised in response to this demand, and is characterized in that the outer wire 6 end of the Bowden wire 5 is supported by the housing 1 to which the brake lever 9 is pivotally connected, and the inner wire 7 is inserted through the housing 1. In the brake lever device B, a nipple 8 having a circular cross section and fixed to the insertion end of the inner wire 7 is inserted into a locking hole 12 having a circular cross section and extending through the brake lever 9. Each of at least three notches 22 provided on the outer circumferential surface of the nipple 8 or the inner circumferential surface of the locking hole 12 along the axial direction of the locking hole 12 has the same number of notches 22 and each upper end thereof is provided with a connecting strip 24. Each of the combined wear-resistant sliding members 23 is fitted so as not to be movable in the axial direction of the locking hole 12.
A sliding wall 2 that is concentric with the locking hole 12 and prevents direct contact between the inner peripheral surface of the locking hole 12 and the outer peripheral surface of the nipple 8.
5 is attached to the inner peripheral surface of the locking hole 12 when the sliding member 23 is fitted on the nipple 8 side, and the sliding member 2
3 are fitted into the locking hole 12 side, the nipples 8 are slidably provided on the outer circumferential surface of the nipple 8, respectively.

Embodiments of the present invention will be described below with reference to the drawings.
Note that the same parts as those in the conventional example are indicated by the same reference numbers, and the explanation thereof will be omitted.

In FIG. 4, on the outer peripheral surface of the cylindrical nipple 8 inserted into the locking hole 12, three notches 22, 22, 22 having an arcuate cross-sectional shape are formed at approximately equal intervals in the locking hole. It is provided along the 12-axis direction. Each cutout 22, 22, 22 has three sliding members 23, 2 whose cross-sectional shape corresponds to the cutout cross-sectional shape.
3 and 23 are each press-fitted so as to be immovable in the axial direction of the locking hole 12. The material of each sliding member 23, 23, 23 is a wear-resistant synthetic resin, preferably nylon resin. In addition, each sliding member 2
The upper ends of 3, 23, and 23 are connected by a trifurcated connecting strip 24. And each sliding member 23, 23,
23 is concentric with the locking hole 12 and the locking hole 12
Sliding walls 25, 25, 25 that prevent direct contact between the inner circumferential surface and the outer circumferential surface of the nipple 8 are provided so as to be slidable on the inner circumferential surface of the locking hole 12.

As a result, when the brake lever 9 is rotated, the nipple 8 rotates smoothly inside the locking hole 12, the inner wire 7 is not bent, and the sliding members 23, 23, 23 do not fall off. Moreover, each sliding member 23, 23, 23 has notches 22, 22,
Since it is only necessary to press-fit the bushing into the bushing 22, the assembly is easier than the bushing 17 shown in FIG. Furthermore, although the bush 17 in FIG. 3 needs to be installed before inserting the nipple 8 into the locking hole 12, in the case of this embodiment, the sliding member 23 can be installed even after the nipple 8 is inserted into the locking hole 12. It is. Moreover, each sliding member 23,
Since the upper ends of 23 and 23 are connected by the connecting strip 24, handling is convenient, and since the material is wear-resistant synthetic resin, the connecting strip 24 can be used as a runner during molding, and the shape is relatively simple. , and its manufacturing cost is low. Although the number of sliding members 23 may be four or more, three is sufficient to prevent direct contact between the inner circumferential surface of the locking hole 12 and the outer circumferential surface of the nipple 8.

5 and 6 show the sliding member 23 and nipple 8.
This figure shows a different embodiment, and the explanation of the same parts as the embodiment of FIG. 4 will be omitted, and only the differences will be explained.

In FIG. 5, three sliding members 23, 23, 2
Projections 26, 26, 26 are provided at each lower end of 3 to sandwich the connecting strip 24 and the nipple 8.
This allows each sliding member 23, 23, 23 to be cut out 2
2, 22, 22 without being press-fitted, and the sliding members 23, 23, 23 will not come off from the nipple 8.

In Fig. 6, the notch 2 provided in the nipple 8
The cross-sectional shape of 2, 22, 22 is U-shaped, and the width between the two opposing sides becomes gradually narrower toward the lower end. Each sliding member 23, 23, 23 also has a notch 2.
Corresponding to the 2, 22, 22 shape, the width becomes gradually narrower toward the lower end. Thereby, the press-fitting of each sliding member 23, 23, 23 into the notch 22, 22, 22 becomes easy and reliable. Further, by providing the recess 27 for sealing grease in the sliding wall 25, smooth sliding of the sliding wall 25 against the inner peripheral surface of the locking hole 12, that is, smooth rotation of the nipple 8 can be achieved.

Next, FIG. 7 shows that the three notches 22, 22, 22 provided on the outer peripheral surface of the nipple 8 in FIG. The movable members 23, 23, 23 are provided with sliding walls 25, 25, 25 that can freely slide on the outer circumferential surface of the nipple 8, and the other configurations, functions and effects are the same as in the case of Fig. 4. Explanation will be omitted.

According to the present invention, each of at least three notches 22 provided on the outer circumferential surface of the nipple 8 or the inner circumferential surface of the locking hole 12 along the axial direction of the locking hole 12 has the same number of notches 22 as the upper ends of each of the notches 22. Each of the wear-resistant sliding members 23 connected by the connecting strip 24 is fitted so as not to be movable in the axial direction of the locking hole 12. A sliding wall 25 that prevents direct contact between the inner circumferential surface of the locking hole 12 and the outer circumferential surface of the nipple 8 is provided against the inner circumferential surface of the locking hole 12 when the sliding member 23 is fitted on the nipple 8 side. When the sliding member 23 is fitted to the locking hole 12 side, each nipple 8 is slidably provided on the outer peripheral surface of the nipple 8, so when the brake lever 9 is rotated, the nipple 8 is fitted into the locking hole. The inner wire 7 rotates smoothly inside the wire 12, and the inner wire 7 is not bent.
The sliding member 23 will not fall off. Moreover, since each sliding member 23 only needs to be fitted into the notch 22, its assembly is hassle-free.
Since the upper ends of each sliding member 23 are connected by a connecting strip 24, handling is convenient, and since the material is wear-resistant synthetic resin, the runner during molding can be used as the connecting strip 24, and the shape can also be compared. Since it is simple, its manufacturing cost is low.

[Brief explanation of the drawing]

Fig. 1 is an external view of a brake lever device according to a conventional example, Fig. 2 is a partially cutaway sectional view showing the same operating state, and Fig. 3 1 is a conventional example different from Figs. 1 and 2. 3.2 is an enlarged front view of the bushing of FIG. 3.1. FIG. 4.1 is an enlarged view of the main part of the inner wire attachment device according to the first embodiment of the present invention. Figure 4 2 is the fourth
A front view showing the assembled state of the nipple and sliding member in Fig. 1, Fig. 4 and 3 are brakes of the sliding member in Fig.
4 is a perspective view of the nipple shown in FIG. 4 1, FIG. 5 1 is a front view showing the assembled state of the nipple and sliding member according to the second embodiment of the present invention, and FIG. Figure 1
6.1 is a front view showing the assembled state of the nipple and the sliding member according to the third embodiment of the present invention. FIG. 6.2 is a perspective view of the sliding member of FIG. 6.1. 6.3 is a perspective view of the nipple shown in FIG. 6.1, FIG. 7.1 is an enlarged view of essential parts showing the inner wire attachment device according to the fourth embodiment of the present invention, and FIG. 7.2 is a perspective view of the nipple shown in FIG. 1
FIG. 3 is a perspective view of a sliding member of FIG. B... Brake lever device, 1... Housing, 5... Bowden wire, 6... Outer wire, 7... Inner wire, 8... Nipple, 9...
... Brake lever, 12 ... Locking hole, 22 ... Notch, 23 ... Sliding member, 24 ... Connection strip, 25 ...
...Sliding wall.

Claims (1)

[Scope of utility model registration request] The outer wire 6 end of the Bowden wire 5 is supported by the housing 1 to which the brake lever 9 is pivotally attached, and the inner wire 7 is inserted therethrough, and a nipple 8 having a circular cross section and fixed to the insertion end of the inner wire 7 is connected to the brake lever. In the brake lever device B which is inserted into the locking hole 12 having a circular cross section and extending through the nipple 8, a locking hole 12 is formed on the outer circumferential surface of the nipple 8 or on the inner circumferential surface of the locking hole 12 in the axial direction of the locking hole 12. Each of at least three notches 22 provided along the line has the same number of notches 22 and each upper end thereof has a connecting strip 2.
Each of the wear-resistant sliding members 23, which are supplied by the screws 4 and 4, is fitted so as not to be movable in the axial direction of the locking hole 12. A sliding wall 25 that prevents direct contact between the inner circumferential surface of the hole 12 and the outer circumferential surface of the nipple 8 prevents the sliding wall 25 from sliding against the inner circumferential surface of the locking hole 12 when the sliding member 23 is fitted on the nipple 8 side. An inner wire attachment device for a brake lever device, characterized in that when the member 23 is fitted into the locking hole 12 side, the member 23 is slidably provided on the outer peripheral surface of the nipple 8.