Guide for linear body

Abstract: To easily restrict the deflection of a flexible linear body hung between a first and second members which are relatively changed in position. A guide G integrally formed of soft synthetic resin is mounted between an inner tube 6 and an outer tube 7 of a front forked portion for holding an intermediate portion of a brake hose connected to a brake caliper for braking a front wheel of a motor-bicycle. The guide G includes a pair of ring-like mounting portions 12 fixed to the inner tube 6 and the outer tube 7, a band-like bridging portion 13 for connecting both the mounting portions 12 to each other, a plurality of holding portions 14 provided on the bridging portion 13 for holding the brake hose 10. The bridging portion 13 has a flat rectangular sectional shape and is mounted to be curved in the X-direction, which is easy to be deflected and is difficult to be deflected in the X'-direction and the Y-Y directions so that the brake hose 10 does not interfere with a boot 8 and the front fender.

Description: The present invention relates to a guide for a flexible linear body for holding an intermediate portion of the flexible linear body hung between a first member and a second member which are relatively movable, and for restricting the bending and the rocking of the flexible linear body, comprising: a pair of mounting portions connected to said first and second members and a bridging portion for connecting said mounting portions to each other. A guide of this type is known from the generic GB-2 237 854 A showing in a motorbike a rigid front fork protector for holding a brake hose. At its lower end, the protector is fixedly mounted on the inner tube of the front fork. At its upper end, the protector is slidably mounted on the outer tube of the front fork. Techniques for preventing the bending and the rocking of a flexible linear body such as a brake hose or brake cable of a motor-bicycle have been known in unexamined Japanese Utility Model Publication Nos. SHO 57-165586 and SHO 64-22593, and Examined Japanese Utility Model Publication Nos. HEI 3-36470 and SHO 62-38848, wherein the intermediate portion of the linear body is fixed by a clamp or held by insertion through an opening. In the case where a flexible linear body is hung between a first and second members which are relatively movable, the above-described prior art techniques have disadvantages that the mounting position of the clamp for preventing the linear body deflected by the deviation of the first and second members from interfering with the other member is limited, or the rigidity of the linear body is limited. In view of the foregoing, the present invention has been made, and an object of the present invention is to easily restrict the deflection of a flexible linear body hung between a first member and a second member which are relatively movable. To achieve the above object, according to the invention described in claim 1, there is provided a guide for a flexible linear body for holding an intermediate portion of the flexible linear body hung between a first member and a second member which are relatively movable, and for restricting the bending and rocking of the flexible linear body, including: a pair of mounting portions connected to the first and second members, a flexible bridging portion for connecting the mounting portions to each other, a plurality of holding portions provided on the bridging portion for holding the linear body, wherein the bridging portion has such a shape that the bridging portion is more easily deformable in a specified direction not interfering with the other member and is comparatively less easily deformable in the other directions. According to the invention described in claim 2, there is provided a guide body for a linear body according to claim 1, wherein the bridging portion is curved in the specified direction when said pair of the mounting portions are connected to the first and second members. According to the invention described in claim 3, there is provided a guide for a linear body according to claim 1, wherein the mounting portions and the bridging portion are formed of one member. According to the invention described in claim 4, there is provided a guide for a linear body according to claim 1, wherein the mounting portion and the bridging portion are constituted of removable different members. According to the invention described in claim 5, there is provided a guide for a linear body according to claim 1, wherein a holding portion having an approximately cylindrical shape with a slit is formed integrally with the bridging portion. According to the invention described in claim 6, there is provided a guide for a linear body according to claim 1, wherein the sectional shape of the bridging portion is an approximately rectangular shape which is narrow in width along the specified direction and is wide in width along the direction perpendicular thereto. Fig. 1 A side view of a front portion of a motor-bicycle according to a first embodiment. Fig. 2 An enlarged perspective view of an essential portion of Fig. 1. Fig. 3 A view showing a modification of the first embodiment. Fig. 4 A view showing another modification of the first embodiment. Fig. 5 A view showing a further modification of the first embodiment. Fig. 6 A side view of a rear portion of a motor-bicycle according to a second embodiment. Fig. 7 An enlarged perspective view of an essential portion of Fig. 6. Hereinafter, embodiments of the present invention will be described with reference to the drawings. Figs. 1 and 2 show a first embodiment of the present invention, wherein Fig. 1 is a side view of the front portion of a motor-bicycle, and Fig. 2 is an enlarged view of an essential portion of Fig. 1. As shown in Fig. 1, front fork portions 4 for rotatably supporting a front wheel Wf at their lower ends are pivotally supported by a head pipe 3 fixed to the front ends of a main pipe 1 and a down-tube 2 in such a manner as to be operable in the transverse direction. The front fork portion 4 includes an upper inner tube 6 connected to a handle 5, and a lower outer tube 7 telescopically fitted around the outer periphery of the lower portion of the upper inner tube 6. An expansible boot 8 is mounted between both the tubes 6 and 7. In this embodiment, the inner tube 6 constitutes a first member, and the outer tube 7 constitutes a second member. A brake hose 10 extending from a master cylinder (not shown) operated by a brake lever 9 provided on the handle 5 downwardly extends along the front fork portion 4, and is connected to a brake caliper 11 provided on the lower end of the outer tube 7. A guide G is mounted between the lower portion of the inner tube 6 and the upper portion of the outer tube 7 in such a manner that the upper and lower end of the guide G hold the boot 8 therebetween. An intermediate portion of the brake hose 10 is held by the guide G. The brake hose 10 constitutes a linear body in the first embodiment. The structure of the guide G will be described in detail below with reference to Fig. 2. The guide G is integrally formed of synthetic resin, which includes a pair of mounting portions 12, 12, a bridging portion 13 connecting the mounting portions 12, 12 to each other, and six pieces of holding portions 14... provided on the bridging portion 13. Each of the mounting portions 12 is formed in a ring shape, and it has a pair of mounting brackets 12 2 , 12 2 formed to hold a slit 12 1 therebetween. The mounting portion 12 can be fixed on the inner tube 6 or outer tube 7 by elastically opening the slit 12 1 , fitting the mounting portion 12 around the outer periphery of the inner tube 6 or outer tube 7, passing a bolt 15 through bolt holes 12 3 , 12 3 formed in the mounting brackets 12 2 , 12 2 , and fastening the bolt 15 by means of a nut 16. At this time, by engaging a positioning hole 12 4 formed on the mounting portion 12 with a pin (not shown) planted on the inner tube 6 or outer tube 7, the mounting portion 12 is pin-fitted. The bridging portion 13 is formed in a band shape having a flat rectangular section, and is connected at both the ends to a pair of the mounting portions 12, 12. In a free state (no lead state), the bridging portion 13 is curved in an arcuate shape; while in a mounting state, it is curved toward the rear side of a vehicle (X-direction). The bridging portion 13 is mounted while keeping a specified looseness so that even when the front fork portion 4 is most extended (full rebounding state), the bridging portion 13 does not fully extend and keeps the curved state. The bridging portion 13 has a small width in the curving directions (X-X' directions) and is easy to be deflected in the X-X' directions; while it has a large width in the directions (Y-Y' directions) perpendicular to the curving directions and is difficult to be deflected in the Y-Y' directions. However, since the bridging portion 13 is mounted in the state that it is previously curved in the X-direction, when the front fork portion 4 is extended and the distance between a pair of the mounting portions 12, 12 is changed, the bridging portion 13 is substantially deflected only in the X-direction and is little deflected in the X'-direction and in the Y-Y' directions. Each of the holding portions 14 provided integrally with the bridging portion 13 at specified intervals is formed in a cylindrical shape, and it has a slit 14 1 extending the axial direction. By elastically opening the slit 14 1 , the brake hose 10 can be simply held by the holding portion 14. The bridging portion 13 is positioned at the back of the boot 8, and the brake hose 10 is positioned at the back of the bridging portion 13. Accordingly, a stone flying from the front side is blocked by the boot 8 and the bridging portion 13. When the front fork portion 4 is extended/contracted during running of a motor-bicycle, the distance between the mounting portion 12 fixed on the inner tube 6 and the mounting portion 12 fixed on the outer tube 7 is increased/decreased, and thereby the bridging portion 13 is curved between the state shown by the solid line and the state shown by the chain line in Fig. 1. At this time, the curving direction of the bridging portion 13 is restricted on the rear-side of the vehicle (X-direction) and the brake hose 10 is held along the bridging portion 13. This eliminates inconveniences that the bridging portion 13 is rocked on the front side of the vehicle, causing the brake hose 10 to interfere with the boot 8; or the bridging portion 13 is rocked in the width direction of the vehicular, causing the brake hose 10 to interfere with the front fender 17. Since the brake hose 10 held along the bridging portion 13 is curved not sharply but smoothly, the brake hose 10 is not applied with a large bending stress, and further the intermediate portion of the brake hose 10 is not caught by the other member such as the front fender 17 and is thus not applied with a large tensile strength. Accordingly, it becomes possible to prevent the damage of the brake hose 10. Since the bridging portion 13 for holding the intermediate portion of the brake hose 10 is not directly connected to the inner tube 6 and the outer tube 7 but is indirectly connected at both the ends to the inner tube 6 and the outer tube 7 by way of the mounting portions 12, 12, the brake hose 10 can be easily held at a position where the brake hose 10 was difficult to be held because the clamp could not be held. Fig. 3 shows a modification of the first embodiment, wherein the sectional shape of the bridging portion 13 is formed approximately in an isosceles triangle having a height lower in the longitudinal direction of the vehicle, thereby making easy the deflection of the bridging portion 13 on the rear side of the vehicle. Fig. 4 shows another modification of the first embodiment, wherein cut-outs 13 1 are formed in the surface of a bridging portion 13 of a circular section on the rear side of the vehicle at specified intervals, thereby making easy the deflection of the bridging portion 13 on the rear side of the vehicle. Fig. 5 shows a further modification of the first embodiment, wherein the mounting portions 12, 12 of the guide G are made of a material different from that of the bridging portion 13. Bolts 15, 15 for fastening the mounting brackets 12 2 , 12 2 of the mounting portions 12, 12 are allowed to pass through bolt holes 13 3 , 13 3 of the mounting brackets 13 2 , 13 2 provided at both the ends of the bridging portion 13. With this arrangement, when the mounting portions 12, 12 are fixed on the inner tube 6 or the outer tube 7, the bridging portion 13 can be fastened together with the mounting portions 12, 12. In this modification, the number of parts of the guide G is increased as compared with the first embodiment; however, by molding the mounting portions 12, 12 separately from the bridging portion 13, the molding die can be reduced in size. Moreover, the versatility of the guide G can be enhanced by preparing a plurality of kinds of the mounting portions 12, 12 and bridging portion 13 different in size and shape, and using them in a suitable combination. A second embodiment of the present invention will be described with reference to Figs. 6 and 7. As shown in Fig. 6, a rear forked portion 23 (second member) is pivotally supported on the rear end of each rear tube 21 (first member) of a motor-bicycle by way of a pivot 22 in such a manner as to be vertically rockable. A brake arm 25 of a drum brake 24 for braking a rear wheel Wr rotatably supported at the rear end of the rear forked portion 23, and a brake pedal (not shown) are connected to each other by way of a brake cable (linear body) extending along the lower side of the rear tube 21 and the rear forked portion 23. The brake cable 26 hung between the rear tube 21 and the rear forked portion 23 is held by a guide G. As shown in Fig. 7, the guide G is integrally formed of a soft synthetic resin, and it includes a pair of mounting portions 12, 12, a bridging portion 13 for connecting both the mounting portions 12, 12 to each other, and five pieces of holding portions 14... provided on the bridging portion 13. The structures of the bridging portion 13 and the holding portion 14 are substantially the same as those in the first embodiment. The structure of the mounting portion 12 is different from that in the first embodiment. Namely, the mounting portion 12 is formed in a plate-like shape, and it is fixed to the rear tube 21 or rear forked portion 23 by means of a bolt 15 passing through a bolt hole 12 6 formed on the mounting portion 12 and a nut 16 screwed with the bolt 15. According to the second embodiment, when the rear forked portion 23 is vertically rocked relative to the rear tube 21 during running of a motor-bicycle, the guide G is curved only downwardly (from the position shown by the solid line to the position shown by the chain line in Fig. 6) together with the brake cable 26. This eliminates inconveniences that the bridging portion 13 is rocked upwardly and the brake cable 26 interferes with the rear tube 21 or the rear forked portion 23; or the bridging portion 13 is rocked in the width direction of the vehicle, and the brake cable 26 interferes with the other member or is caught by the other member thereby causing a large tensile strength. Moreover, since the brake cable 26 held along the bridging portion 13 is not sharply bent, it is not applied with a large bending stress. Even when a small stone flown by the rear wheel Wr is dropped in front of the rear wheel Wr, the brake cable 26 covered on the upper surface with the bridging portion 13 of the guide G is prevented from being damaged. Although the present invention has been described with reference to the embodiments, various changes in design are possible without departing from the scope of the present invention. For example, the first and second members of the present invention are not particularly limited as long as they are relatively movable. The linear body is not limited to the brake hose 10 and the brake cable 26 in the embodiments, and it may include an arbitrary linear body such as a hose, pipe, tube, cable, wire and electric wire. In particular, even a linear body, which cannot be positively held by a conventional clamp because of being low in rigidity and being easer to be deflected, can be positively held by the bridging portion 13. The bridging portion 13 may be molded to be in the straight line in a free state (no load state) and may be curved after mounting. Summarized the present invention easily restricts the deflection of a flexible linear body hung between a first and second members which are relatively movable. A guide G integrally formed of soft synthetic resin is mounted between an inner tube 6 and an outer tube 7 of a front forked portion for holding an intermediate portion of a brake hose connected to a brake caliper for braking a front wheel of a motor-bicycle. The guide G includes a pair of ring-like mounting portions 12 fixed to the inner tube 6 and the outer tube 7, a band-like bridging portion 13 for connecting both the mounting portions 12 to each other, a plurality of holding portions 14 provided on the bridging portion 13 for holding the brake hose 10. The bridging portion 13 has a flat rectangular sectional shape and is mounted to be curved in the X-direction, which is more easily deflectable and is less easily deflectable in the X'-direction and the Y-Y directions so that the brake hose 10 does not interfere with a boot 8 and the front fender.

Claims: A guide for a flexible linear body for holding an intermediate portion of said flexible linear body (10, 26) hung between a first member (6, 21) and a second member (7, 23) which are relatively movable, and for restricting the bending and rocking of said flexible linear body (10, 26), comprising: a pair of mounting portions (12) connected to said first and second members (6, 21; 7, 23) and a bridging portion (13) for connecting said mounting portions (12) to each other, characterized in that the bridging portion (13) is flexible and that a plurality of holding portions (14) are provided on said bridging portion (13) for holding said linear body, wherein said bridging portion (13) has such a shape that said bridging portion (13) is more deformable in a specified direction not interfering with the other member and is less deformable in the other directions. A guide body for a linear body according to claim 1, wherein said bridging portion (13) is curved in said specified direction when said pair of said mounting portions (12) are connected to said first and second members (6, 21; 7, 23). A guide for a linear body according to claim 1, wherein said mounting portions (12) and said bridging portion (13) are formed of one member. A guide for a linear body according to claim 1, wherein said mounting portion (12) and said bridging portion (13) are constituted of removable different members. A guide for a linear body according to claim 1, wherein a holding portion (14) having an approximately cylindrical shape with a slit (14 1 ) is formed integrally with said bridging portion (13). A guide for a linear body according to claim 1, wherein the sectional shape of said bridging portion (13) is an approximately rectangular shape which is narrow in width along said specified direction and is wide in width along the direction perpendicular thereto.

Inventors: UNETA HISASHI, YAMATE NAOYUKI, UNETA, HISASHI, YAMATE, NAOYUKI
Applicants: HONDA MOTOR CO LTD, HONDA GIKEN KOGYO KABUSHIKI KAISHA
Application year: 1995
Main classification: B62J23
IPC codes: B62K19, B60T17, B62J23, B62J11, B62L3, B62J99