JP5058942B2 - Handlebar telescopic mechanism - Google Patents

Description

  The present invention relates to a handlebar telescopic mechanism for a motorcycle configured by slidably mounting left and right handlebars on a center pipe.

2. Description of the Related Art Conventionally, two-wheeled vehicles such as bicycles have a handlebar that can be expanded and contracted to be compact when stored (see, for example, Patent Document 1 below). In addition, there is also a configuration in which a handlebar can be extended and contracted in order to adapt a training motorcycle capable of various types of simulation of fixed installation to the physique of a passenger (see Patent Document 2 below). Furthermore, in order to select the most suitable handle grip position for the user when creating a custom-made bicycle that has been proposed in recent years, a configuration is also proposed in which the handle bar of the boarding measurement means to be mounted is extendable (for example, (See Japanese Utility Model Publication No. 6-75982).
Japanese Utility Model Publication No. Hei 4-67197 Full Text Microfilm (Refer to Claim of Utility Model Registration) Japanese Patent Laid-Open No. 9-71281 (refer to the claims of the gazette)

  Such a conventional example will be described with reference to the drawings. The handle of the bicycle disclosed in Patent Document 1 is the left and right member having a handshake portion at the end in the first embodiment of FIG. When the left and right members 102 and 103 are rotated to the vertical positions 102 'and 103' as shown in the figure, the housings 102 and 103 are mounted so that they can be raised and lowered around the pins 107 at both ends of the central member 101. The storage space for time was reduced. In the second embodiment shown in FIG. 9B, the left and right members 102 and 103 of the tubular body similarly slide in the axial direction in the central member 101 of the tubular body fixed to the center of the handle shaft 104. The small diameter portion 103a of the right member 103 is fitted in the left member 102. The distal end of the left member 102 contacts the left end of the overhanging step portion 105 of the central member 101, the large diameter portion 103b of the right member 103 stops in contact with the right end of the overhanging step portion 105 of the central member 101, This position is a shortened storage state of the handle bar, and the stop pin 106 is passed through the aligned and aligned holes of the central member 101 and the left and right members 102 and 103 to lock the shortened position.

  As shown in FIG. 10 (A), the steering device with a telescopic mechanism disclosed in Patent Document 2 includes a slide groove 254a (FIG. 10 (B) defined in the holding portions 256a and 256b constituting the handle bar 246. )) 254b and engaging convex portions 258a (FIG. 10B) and 258b formed on the holding portions 256a and 256b, and the engaging convex portions 258a along the slide grooves 254a and 254b. 258b is slidably displaced, so that the height H and the width W of the handlebars on the gripping portions 260a and 260b can be adjusted. When the screw member 266a screwed into the hole 265 is removed by loosening the knob 264a of the stopper member 262a, the gripping portion 260a is slidable along the slide groove 254a.

  With such a handlebar expansion and contraction mechanism, in the first conventional example described in Patent Document 1 of FIG. 9, the storage space of the handlebar at the time of storage can be reduced. There were only two types of bar expansion and contraction during use and storage, and fine adjustment of the expansion and contraction position was impossible. Moreover, in what was described in the second embodiment, since the fitting sliding portion of the left and right members 102 and 103 with respect to the central member 101 and the lock portion by the stop pin 106 are formed of a tubular body, It is easy to be deformed at the time of the tightening lock by 106, the alignment work of the insertion hole in each member for the stop pin 106 is troublesome, and there is a possibility that the stop pin 106 that must be removed at the time of adjustment is lost. Further, in the second conventional example described in Patent Document 2 of FIG. 10, the telescopic mechanism is provided at two places on the left and right sides, each of which requires adjustment work, and is troublesome. Like the conventional example, there is a possibility that the stopper member 262a that must be removed during adjustment may be lost. In addition, the telescopic mechanism is exposed and may be exposed to dust.

  SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a handlebar adjustment mechanism that solves the problems in the conventional handlebar expansion / contraction mechanism and is protected from the outside world and has a high rigidity of the expansion / contraction adjustment section and can be adjusted in multiple stages. To do.

For this reason, the present invention provides a two-wheeled vehicle handlebar expansion / contraction mechanism in which left and right handlebars are slidably attached to a center pipe, and the inner end portions of the left and right handlebars are a pair of left and right slide portions in the center pipe. Is configured to be slidable and tightenable with respect to the center pipe, and long holes are formed in the respective slide portions in the axial direction of the handlebars, and inserted into the long holes through the center pipe. By tightening the tightening bolt and the tightening nut, the slide portions of the left and right handlebars are pressed against the inner wall of the center pipe and fixed so that the appropriate position of each slide portion with respect to the center pipe can be adjusted, and the side surface of the tightening nut Is cut as a rotation stop surface, and either one of the long holes of the slide portion or the Wherein the aligned inserted into the hole for the tightening nut is bored to Tapaipu. Further, the present invention is characterized in that moderation means for selectively positioning each slide portion with respect to the center pipe is provided between the center pipe and the slide portion. The present onset Ming, the holes for the tightening nut, which is formed in the center pipe, in which collapse against the center pipe tightening bolts and tightening nuts is characterized by being configured to be inhibited, these problems solved As a means for

According to the present invention, in a handlebar telescopic mechanism of a motorcycle configured such that left and right handlebars are slidably attached to a center pipe, the inner end portions of the left and right handlebars are a pair of left and right slide portions in the center pipe. Is configured to be slidable and tightenable with respect to the center pipe, and long holes are formed in the respective slide portions in the axial direction of the handlebars, and inserted into the long holes through the center pipe. By tightening the tightening bolt and the tightening nut, the slide portions of the left and right handlebars are pressed against the inner wall of the center pipe and fixed so that the appropriate position of each slide portion with respect to the center pipe can be adjusted, and the side surface of the tightening nut As a rotation stop surface, either one of the long holes of the slide part or the center By aligned inserted into the hole for the tightening nut is bored to Paipu, sliding portions of the left and right inside the handlebar constituting the telescopic adjustment portion that is protected from the outside by the center pipe, the polymerization unit Since the center pipe is fastened together with a relatively wide area of the arcuate cross section, the fastening strength is secured with a high strength at a low surface pressure. In addition, since the overlapping slide portion has a circular arc surface in section, high stretch accuracy is ensured by stably stretching smoothly. In addition, since the relative position of each slide portion, that is, the expansion and contraction of the handlebar can be adjusted by simply loosening without removing the tightening bolt and the tightening nut inserted in each of the long holes, the tightening bolt and the tightening nut may be lost. In addition, the tightening of the tightening bolts to the slide portion of the handle bar ensures that the pair of slide portions are pressed against the inner wall of the center pipe, thereby ensuring a predetermined tightening strength. In addition, it is possible to arrange the tightening nut so as not to rotate with respect to the slide portion or the center pipe, and it is not necessary to hold the tightening nut with a spanner or the like when the tightening bolt screwed to the tightening nut is tightened. Tightening work is simplified.

In the case of providing the detent means for selectively positioning the front position of the slide portion to the xenon centers the pipe between the center pipe and the slide portion, each based on the matching function between the tightening bolt and elongated hole The slide part can be surely and easily expanded and contracted in multiple stages at an appropriate position in the axial direction by the moderation mechanism without shifting in the rotational direction.

Furthermore, the hole for the cell the tightening nut drilled in the centers pipe, if the inclination with respect to the center pipe of the tightening bolt and tightening the nut is configured to be suppressed, with free pore diameters for tightening nut just enough The center pipe does not cause a large shift in the axial and circumferential directions of the handlebar with respect to the center pipe when the handlebar is extended and contracted, and the clamp bolts are effectively prevented from falling, preventing smooth sliding of the slide part. Thus, the handlebar can be smoothly expanded and contracted.

Embodiments of the handlebar expansion and contraction mechanism of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the basic structure of the handlebar telescopic mechanism of the present invention is a handlebar telescopic mechanism for a two-wheeled vehicle constructed by slidably mounting left and right handlebars 5, 6 on a center pipe 2. The inner end portions of the left and right handlebars 5 and 6 are configured such that a pair of left and right slide portions can overlap and slide with respect to the center pipe 2 in the center pipe 2 , and can be fastened to the center pipe 2 . Long holes 3D and 4D are formed in the directions, and the left and right handlebars 5 and 6 are slid by tightening tightening bolts 9 and tightening nuts 7 inserted through the center pipe 2 in the long holes. The portion is pressed against and fixed to the inner wall of the center pipe 2 so that the appropriate position of each slide portion with respect to the center pipe 2 can be adjusted, As cut the sides of the fastening nut 7 arresting surfaces 7A, one of the long hole 3D of the sliding portion, 4D or that it has aligned inserted into the hole for said tightening nut which is formed in the center pipe 2 Features.

  In order to make it compact for storage, or to adapt a fixed installation type training motorcycle to the physique of the passenger, and to optimize the position of the handle of the riding measurement means to board when creating a custom-made bicycle As shown in FIGS. 1 (A) and 3 (B), the handle bar assembly 1 according to the present invention has a half of the handle post upper end as shown in FIGS. 1 (A) and 3 (B). Left and right handlebars 5 and 6 are slidably and tightly attached to a center pipe 2 that is inserted into a bifurcated handle stem 11 and fixed by a fastening bolt 12. A flat, flat surface in which the main body portions 3A and 4A of the right and left slide members 3, 4 having a substantially semicircular cross section as a slide portion in the circular pipe-shaped center pipe 2 are opposed surfaces thereof. The slide surfaces 3C and 4C are configured so that they can slide smoothly and reliably. When the solid left and right slide members 3 and 4 are tightened by tightening bolts 9 described later, the flat slide surfaces 3C and 4C can receive a tightening force in a relatively wide area. Reliable tightening force can be obtained with high rigidity.

  A moderation means 10 is interposed between the center pipe 2 and the vicinity of the outer end of the upper surface of each slide member 3, 4. The moderation means 10 includes, for example, a moderation ball 10A housed by being urged outward by a spring 10B in a hole formed in the upper surface of each slide member 3, 4, and a plurality of selections for receiving the moderation ball 10A. A plurality of moderation holes 5A,... Are formed in the axial direction of the center pipe 2 (see FIGS. 1B and 3A). The moderation means 10 in the right slide member 4 can be disposed on the lower portion or the side surface instead of the upper portion as in the illustrated example. Joined small-diameter portions 3B and 4B (see also FIG. 2) are formed at the outer end portions of these slide members 3 and 4, and the left and right handlebars 5 and 6 are respectively formed on these joined small-diameter portions 3B and 4B. The inner end is fitted and joined by brazing or the like. Since the handlebars 5 and 6 and the slide members 3 and 4 can be configured as separate members, the slide member is required to improve the degree of freedom of design of the handlebar that is often bent and to have high rigidity and slidability. The degree of freedom in selecting the material can be improved. Of course, it is needless to say that the handlebar and the slide member are integrally configured within the scope of the present invention.

  Referring to FIG. 2, as shown in FIG. 1 (A), the left and right slide members 3 and 4 are slid onto the flat flat slide surfaces 3C and 4C which are opposed surfaces thereof. Is guided within the arc inner circumferential surface of the center pipe 2 without deviation of the outer arc surfaces of the slide members 3 and 4. Then, long holes 3D and 4D having a predetermined length are formed in the axial direction perpendicular to the slide surfaces 3C and 4C. The shaft portion 9B of the tightening bolt 9 that passes through the center pipe 2 in the vertical direction in alignment with the long holes 3D and 4D is inserted and penetrated. As shown in FIG. 3A, a bolt hole 2 </ b> B is formed in the approximate center of the center pipe 2. As shown in FIG. 1B, a non-circular tool hole 9A is formed in the head of the tightening bolt 9. As shown in FIG. 1C, a socket member 8 is interposed between the head of the tightening bolt 9 and the surface of the center pipe 2. The lower surface of the socket member 8 is formed on a surface that is aligned with the outer surface of the center pipe 2, and the tightening force from the head of the tightening bolt 9 can be transmitted to the outer surface of the center pipe 2 without being biased.

  Further, the screw cylinder portion 7C (FIG. 3D) of the tightening nut 7 is screwed into the screw portion 9C at the lower end portion of the tightening bolt 9. As shown in FIGS. 3C to 3E, the tightening nut 7 has a rotation stop surface 7A having a cut side surface, and one of the slide members (right slide member 4 in the illustrated example). The tightening nut 7 can be disposed by being inserted into the long hole 4D so that the tightening nut 7 is prevented from rotating with respect to the slide member 4, and the tightening nut 7 is screwed and tightened with the tightening bolt 9 screwed to the tightening nut 7. There is no need to hold the frame with a spanner or the like, and the tightening operation is simplified. Further, the tightening nut 7 is formed with a step portion 7B formed from the lower end portion of the rotation stop surface 7A, and the step portion 7B is formed in an arc shape of the right slide member 4 as shown in FIG. The tightening nut 7 can be surely arranged orthogonally by being seated on a flat nut seating surface 4E formed at the lower portion of the outer peripheral surface (see also FIG. 1C). Here, the expansion / contraction adjusting portion is composed of left and right slide members 3, 4 in the center pipe 2, moderation means 10, tightening bolts 9, and tightening nuts 7.

  With such a configuration, in order to adjust the left and right lengths of the handlebar assembly 1, a tool suitable for the tool hole 9 </ b> A of the head of the tightening bolt 9 is inserted, and the tightening bolt 9 is screwed into the tightening nut 7. The left and right handlebars 5 and 6 are expanded and contracted to the right and left, and the moderation ball 10A in each moderation means 10 of the left and right slide members 3 and 4 is moderated (clicked to the appropriate moderation hole 2A in the center pipe 2) ), The provisional expansion / contraction length is selected stepwise, the tightening bolt 9 is tightened, and the left and right slide members 3 and 4 are fastened together to form the handlebar 1 It is possible to complete the expansion / contraction adjustment of the left and right lengths. Needless to say, this does not prevent fine adjustment of the expansion / contraction position by tightening the tightening bolt 9 at a portion other than the moderation position by the moderation means 10. Further, by forming a slit portion in the axial direction in the center pipe 2 so that the outer periphery can be reduced in diameter, and by tightening a fastening band or the like around the outer periphery thereof, the tightening bolt 9 and the tightening nut 7 can be used. Tightening means can be omitted.

  FIG. 4 shows a second embodiment of the handlebar expansion / contraction mechanism of the present invention, and is a front cross-sectional view of the main part of the handlebar expansion / contraction mechanism before and after expansion / contraction. FIG. 4A shows the state when the widest extension is performed, and FIG. 4B shows the state when the narrowest width is shortened. In this embodiment, as shown in FIG. 5, the solid slide member 4 is installed only on the right handle bar 6 side. Therefore, as shown in FIG. 6, no slide member is installed on the left handlebar 5 side. On the left handlebar 5 side, as will be described later, the inner wall surface 5B of the left handlebar 5 inserted into the center pipe 2 constitutes a slide portion, and the slide portion is constituted on the right handlebar 6 side. Thus, the slide fitting is performed on the outer peripheral slide surface 4F of the solid slide member 4 to be performed. As is well understood in FIG. 4, the outer peripheral surface of the left handle bar 5 fitted to the outer periphery of the slide member 4 on the right handle bar 6 side forms a slide portion between the inner wall surface of the center pipe 2. And slide it over.

  As shown in FIG. 4 (A), a large-diameter portion provided with moderation means 10 is provided on the inner side in the axial direction of the joint small-diameter portion 4B of the slide member 4 to which the inner end of the right handle bar 6 is fitted and joined. The main body 4A of the slide member 4 is extended and formed toward the left handlebar 5 side. At the tip of the main body 4A, a moderation means 10 that engages with a plurality of selected moderation holes 5A formed at positions corresponding to the left handlebar 5 is installed, and used for adjusting the expansion and contraction of the left handlebar 5. A step is formed between the large-diameter portion of the slide member 4 and the main body portion 4A, and this step portion is a stopper portion 4G (FIG. 4A) as well understood in FIG. 4B. As a result, the position of the right inner end of the left handlebar 5 when the handlebar assembly 1 is shortened to the narrowest width is restricted.

  FIG. 5 is a front view and a bottom view of a right handlebar having a slide member. The small-diameter main body portion 4A of the slide member 4 constituting the slide portion has a slide surface 4F on the outer peripheral surface, and a long hole 4D for a tightening bolt 9 to be described later penetrates in the middle portion in the axial direction. A flat nut seating surface 4E is formed in the lower part. FIG. 6 is a front view and a bottom view of a partial cross section of the left handle bar. A slide member is not joined to the left handle bar 5. The left handlebar 5 is provided with a plurality of selected moderation holes 5A that engage with the moderation means 10 on the distal end side of the right slide member 4, and a long hole 5C for a tightening bolt 9 to be described later is formed on the upper side. A long hole 5D for the tightening nut 7 is formed on the lower side. As shown in FIG. 4, a tightening bolt 9 is inserted vertically through the long hole 4 </ b> D of the slide member 4 and the long holes 5 </ b> C and 5 </ b> D of the left handlebar 5, and tightened with a tightening nut 7.

  FIG. 7 is a longitudinal cross-sectional view and a cross-sectional view of a center pipe including a tightening bolt and a tightening nut. As shown in FIG. 7B, the tightening nut 7 is seated on the nut seating surface 4E and the non-rotating cut surface 7A to be inserted into the long hole 4D of the slide member 4 and the nut seating surface 4E, as in the first embodiment. A stepped portion 7B is formed. A tightening nut hole 2 </ b> C is formed in the center pipe 2 that receives the outer periphery of the tightening nut 7, and the inner diameter of the tightening nut hole 2 </ b> C is configured to substantially match the outer periphery of the tightening nut 7. Accordingly, the tilting bolt 9 is effectively prevented from falling when the handlebars 5 and 6 are extended or contracted, and the smooth sliding of the slide portion is not hindered, and the handlebar can be smoothly adjusted. In addition, if the outer periphery of the tightening nut 7 is non-circular (such as hexagonal) and the tightening nut hole 2C has a similar shape to the outer periphery of the nut, it is possible to eliminate the need for rotation by the cut surface 7A or the like.

  As shown in FIG. 4, in order to adjust the left and right handlebars 5 and 6 to expand and contract in multiple stages between FIGS. 4A and 4B, the left and right handlebars 5 and 6 are adjusted in the width direction of the bicycle. Pressing inward, the two moderation means 10 and 10 in the slide member 4 selectively engage appropriate ones of the plurality of selected moderation holes 2A in the center pipe 2 and the plurality of selected moderation holes 5A in the left handlebar 5. At that time, between the outer peripheral surface of the right handle bar 5 and the inner wall surface of the center pipe 2 constituting the slide portion, between the outer peripheral slide surface 4F of the slide member 4 and the inner wall slide surface 5B of the left handle bar 5, Between the outer peripheral surface of the left handlebar 5 and the inner wall surface of the center pipe 2 slid smoothly by the circumferential surface having an arcuate cross section. At the selected position, the tightening bolt 9 is screwed and fastened to the tightening nut 7. As a result, the stepped portion 7B of the tightening nut 7 presses the slide member 4 against the inner wall surface side of the center pipe 2 via the flat fence-shaped seating surface 4E. Thus, due to the high rigidity of the solid slide member 4, the tubular portions of the left and right handlebars 5, 6 can be reliably and firmly pressed against the inner wall side of the center pipe 2, and the tightening strength can be secured.

  FIG. 8 shows a third embodiment of the handlebar expansion / contraction mechanism of the present invention, and is a cross-sectional view of the main part of the handlebar expansion / contraction mechanism before and after expansion / contraction. In the present embodiment, the solid slide member is eliminated, and the inner end portions of the left and right handlebars 5 and 6 overlap each other to form a slide portion. In the embodiment, a small-diameter portion 6A is formed on the inner end side of the right handle bar 6, and the small-diameter portion 6A is inserted into the inner wall surface 5B of the left handle bar 5 to be polymerized. A stopper portion 6G (FIG. 8B) for restricting the movement of the inner end surface of the left handle bar 5 is formed at the stepped portion at the starting end of the small diameter portion 6A of the right handle bar 6. The moderation means 10 is disposed at a position where the large diameter portion of the right handle bar 6 near the stopper portion 6G and the inner end surface of the right handle bar 6 in the left handle bar 5 are close to each other. The selected moderation holes 2A with which the moderation balls 10A of the moderation means 10 are engaged are formed at corresponding positions on both ends of the center pipe 2.

  On the top and bottom of the left handlebar 5 and on the top and bottom of the right handlebar 6, holes 5C for tightening bolts, holes 5D for tightening nuts, holes 6C for tightening bolts, and holes 6D for tightening nuts are formed, respectively. The tightening bolt 9 and the tightening nut 7 are vertically inserted and screwed through the hole. Accordingly, the sliding portions of the left and right handlebars 5, 6 that slide together are pressed against the inner wall surface of the center pipe 2 via the tightening nut 7 by screwing the tightening bolt 9 to the tightening nut 7. Preferably, the upper surface of the tightening nut 7 is formed in a circular arc surface that is aligned with the inner wall surface of the right handle bar 6. As a result, the center pipe 2 and the overlapping slide portions of the left and right handlebars can be tightened uniformly and firmly with low surface pressure. Further, if the hole 2C for the tightening nut 7 in the center pipe 2 has a diameter that is not excessive or insufficient with respect to the outer diameter of the tightening nut 7, a large deviation in the axial direction and the circumferential direction of the handle bar with respect to the center pipe when adjusting the expansion and contraction of the handle bar. This prevents the tightening bolt from falling down effectively, so that smooth sliding of the slide portion is not hindered, and smooth adjustment of the handlebar can be performed.

  As described above, the embodiments of the present invention have been described. However, within the scope of the present invention, the type of the two-wheeled vehicle such as a bicycle, the fixed form of the center pipe to the handle post, the shape of the center pipe (the cylindrical shape is preferred, Cylindrical shape is not excluded), type, left and right handlebar shapes (bent shape up to the grip, placement site, etc.), type and material (a material different from the slide member is preferred, but homogeneous materials are not excluded) ) And its joining form to the slide member (such as brazing joining using a joining small diameter part, screwing joining using spline fitting, etc.), the shape of the sliding member (a shape that matches the cross-sectional shape of the center pipe), type and material (Preferably a high-rigidity material), superposition form of the slide surface in the slide member (preferably a high-precision smooth surface, but increase mutual friction tightening force) (It can also be a rough surface), long hole drilling form (the end may be formed in an arc shape that matches the cross section of the tightening bolt shaft), and tightening nut alignment insertion form for the long hole (It is preferable to align and insert the locking surface, but if a locking part is formed on the tightening nut between the center pipe and the locking member, it is not necessary to form a locking surface to be inserted into the long hole.) Shape, type and material, shape of tightening bolt including tool hole, type, shape of tightening nut including locking surface and step, shape, shape of moderation means, type (in addition to moderation ball and coil spring combination) , A combination of a wedge piece and a leaf spring, etc. The selected moderation hole in the center pipe may be a press-formed concave groove) or the like.

It is sectional drawing in the front principal part sectional view, principal part top view, and fastening bolt part of an expansion-contraction mechanism which shows 1st Example of the handlebar expansion-contraction mechanism of this invention. FIG. 6 is a front view of each slide member of the handlebar expansion / contraction mechanism and a plan view of the slide surface. FIG. 6 is a plan view and a side view of a center pipe of the handlebar extension mechanism, and a front view, a side view, and a plan view of a tightening nut. The 2nd Example of the handlebar expansion-contraction mechanism of this invention is shown, It is front principal part sectional drawing before and behind expansion / contraction of a handlebar expansion-contraction mechanism. It is the front and bottom view of a right handlebar which has a slide member equally. It is the front and bottom view of the partial cross section of a left handlebar. It is the longitudinal cross section and center cross section of the center pipe. FIG. 7 is a front cross-sectional view of a main part of the handlebar expansion / contraction mechanism of the present invention before and after expansion / contraction of the handlebar expansion / contraction mechanism. It is explanatory drawing of the storage state of the handle | steering_wheel of the bicycle as a 1st prior art example. It is explanatory drawing of the steering apparatus with an expansion-contraction mechanism as a 2nd prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Handlebar assembly 2 Center pipe 2A Selection moderation hole 2B Bolt hole 3 Left slide member 3A Main body part 3B Joining small diameter part 3C Slide surface 3D Long hole 4 Right slide member 4A Main body part 4B Joining small diameter part 4C Slide surface 4D Long hole 4E Nut Seating surface 5 Left handlebar 6 Right handlebar 7 Tightening nut 7A Cut surface (rotation stop surface)
7B Step portion 8 Socket member 9 Tightening bolt 9A Tool hole 9B Shaft portion 9C Screw portion 10 Moderation means 10A Moderation ball

Claims (3)

In the handlebar telescopic mechanism of a two-wheeled vehicle constructed by slidably mounting the left and right handlebars with respect to the center pipe, the inner end of the left and right handlebars can slide in a pair of left and right slide portions in the center pipe, And a tightening bolt and a tightening nut that are configured to be capable of being tightened with respect to the center pipe, and that each slide portion has a long hole in the axial direction of the handlebar, and is inserted through the center pipe into the long hole. By tightening, the slide parts of the left and right handlebars are pressed against the inner wall of the center pipe and fixed so that the appropriate position of each slide part with respect to the center pipe can be adjusted, and the side surfaces of the tightening nuts are cut and stopped As a surface, drilled in either the long hole of the slide part or the center pipe Handlebar extension mechanism, wherein alignment inserted it into the hole for the tightening nuts. The handlebar telescopic mechanism according to claim 1, wherein moderation means for selectively positioning each slide portion with respect to the center pipe is provided between the center pipe and the slide portion. The handlebar telescopic mechanism according to claim 1 or 2 , wherein the tightening nut and the tightening nut are configured to be prevented from being tilted with respect to the center pipe by the hole for the tightening nut formed in the center pipe.

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