JP4799960B2 - Bicycle post member tightening structure - Google Patents

Description

  The present invention provides a bicycle post in which a slit member is formed at an end portion into which a post member is inserted, and the end portion of the frame member is configured so that the diameter of the end portion can be expanded and contracted. The present invention relates to a member tightening structure.

  Conventionally, in order to fasten and secure a bicycle seat post or a folding bicycle handle post to a frame member such as a standing pipe or a handle tube, a slit portion is formed at the end of the frame member to expand or contract the end diameter. In addition to being configured freely, the seat post and handle post were inserted from the end, and a fastening member (seat band or the like) fixed to the end by spot welding or the like was fastened. However, in such a conventional apparatus, the seat band and the frame member such as the standing pipe are completely integrated by welding, so that it is necessary to tighten the free ends for tightening of the tightening member such as the seat band. The above power was required.

For this reason, in order to reduce the tightening force for tightening, the tightening member is simply attached and fitted to the end of a frame member such as a standing pipe without being fixed by welding or the like. was suggested. However, in this method, there is a possibility that a fastening member such as a seat band may be easily dropped or dropped, or may be rotated around the frame member and the fastening operation cannot be reliably performed. Therefore, there has been proposed a type in which such a fastening member such as a seat band is attached to and fitted to the frame member, and a rotation stopping function is given to the frame member (for example, Patent Document 1 below) reference).
Japanese Utility Model Publication No. 6-33791 (refer to the claims of utility model registration)

  With respect to what is disclosed in this conventional example, the one disclosed in Patent Document 1 will be described with reference to FIG. 4. The vertical pipe 24 and the seat post (not shown), and the vertical pipe 24 and the seat post are connected. The standing pipe 24 is provided with a convex portion 28 and a concave portion 29 fitted to the convex portion 28 is formed on the inner peripheral surface of the seat band 25. With such a configuration, the convex portion 28 of the standing pipe 24 and the concave portion 29 of the seat band 25 are fitted to prevent the seat band 25 from rotating with respect to the standing pipe 24. Reference numeral 27 denotes a slit.

  However, in this conventional one, the one disclosed in Patent Document 1 requires the formation of the convex portion 28 on the outer peripheral surface of the standing pipe 24 and the formation of the concave portion 29 on the inner peripheral surface of the seat band 25. Therefore, as in the case of the above-mentioned document, an increase in cost was caused with difficult processing operations such as punching from the inside of the pipe and formation of recesses on the inner peripheral surface of the seat band 25. In addition, the fitting accuracy between the convex portion 28 and the concave portion 29 is also required, which is not practical.

  Accordingly, the present invention solves the problem of the conventional bicycle post member fastening structure, and the bicycle post member having an effective rotation stopping function even with a simple structure without any structural modification of the fastening member. The purpose is to provide a tightening structure.

For this reason, the present invention provides a bicycle in which a tightening member is attached and fitted to the end of the frame member that is formed with a slit portion at the end where the post member is inserted so that the diameter of the end can be expanded and contracted. In the post member tightening structure, a rotation bracket formed with a locking portion that engages with the slit portion of the frame member is attached to a bolt member that tightens the tightening member, and a bolt to the bolt member of the rotation bracket The mounting hole is eccentric, and the protruding amount of the locking portion from the bolt mounting hole is made different . In the present invention, the rotation bracket is formed in a U-shape composed of a flat base portion and standing portions that are formed upright on both sides thereof, and the rising edges of the both side standing portions are formed on the frame member. This is characterized in that it is a locking portion to the slit portion, and these are used as means for solving the problem.

According to the present invention, a bicycle in which a tightening member is attached and fitted to the end portion of the frame member that is formed with a slit portion at the end portion into which the post member is inserted so that the end diameter can be expanded and contracted. In the post member tightening structure, a rotation bracket formed with a locking portion that engages with the slit portion of the frame member is attached to a bolt member that tightens the tightening member, and a bolt to the bolt member of the rotation bracket By decentering the mounting hole and changing the amount of protrusion of the locking part from the bolt mounting hole, the bolt member that tightens the tightening member is engaged without any processing on the tightening member and frame member. By simply mounting the anti-rotation bracket that forms the stop, the effective anti-rotation function of the tightening member can be added, and the post member is securely tightened to the frame member. It is possible. In addition, it is possible to cope with a tightening member in which the axial center of the frame member or the post member and the bolt mounting hole of the tightening member are different by changing the front and rear positions of the locking bracket. Become.

The anti-rotation bracket is formed in a U-shape composed of a flat plate-like base portion and standing portions formed so as to stand on both sides thereof, and rising edges of the both side standing portions are formed on the slit portions of the frame member. In this case, the four standing edges of both side standing portions of the U-shaped locking bracket can be used as the locking portions to the slit portions of the frame member. By appropriately varying the amount or the like, it is possible to select the front / rear / right / left mounting positions of the locking bracket on the bolt member to cope with the rotation of the tightening member having various dimensions.

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a first embodiment of a bicycle post member tightening structure according to the present invention. FIG. 1 (A) is a sectional view of an essential part, and FIG. 1 (B) is a front view thereof (from the rear of a vehicle body). 2) is an exploded perspective view. FIG. 3 shows a second embodiment of the bicycle post member tightening structure according to the present invention. FIG. 3 (A) is a plan view and a side view of the detent bracket, and FIG. 3 (B) is a front view of the detent bracket. A side view and FIG. 3C are cross-sectional views of main parts. As shown in FIG. 1, the basic configuration of the bicycle post member tightening structure of the present invention is configured such that a slit portion 6 is formed at an end portion where the post member 2 is inserted so that the end diameter can be expanded and contracted. In a bicycle post member tightening structure in which a horseshoe-shaped tightening member 3 is attached and fitted to the end of the frame member 1 so as to be tightened freely, a locking portion 7D that engages with the slit portion 6 of the frame member 1 is formed. The stop bracket 7 is attached to the bolt member 4 that fastens the tightening member 3, and the bolt mounting hole 13 to the bolt member 4 of the anti-rotation bracket 7 is eccentric so that the locking portion 7 </ b> D from the bolt mounting hole 13 is provided. It is characterized in that the protruding amount of is different .

  This will be described in detail below. In the embodiment, a seat post with a saddle installed at the upper end as the post member 2 and a standing pipe with a hanger lug installed at the lower end as the frame member 1 are exemplified, but the post member 2 and the frame member 1 are others. The present invention can also be applied to a tightening portion, for example, a portion where a handle post of a folding bicycle is fastened and fixed to a frame member such as a handle tube. As shown in FIG. 1 (B), in the upper end portion of the standing pipe 1 in which a hanger lug (not shown) is installed at the lower end portion, a longitudinally slit portion is formed on a part of the circumference on the vehicle body rear side (front side of the paper) 6 is formed. By tightening the horseshoe-shaped tightening member 3 attached and fitted to the upper end portion of the standing pipe 1 by the slit portion 6, the upper end portion of the standing pipe 1 can be reduced in diameter and inserted from the upper end portion of the standing pipe 1. The seat post 2 as the post member thus formed can be tightened and tightened.

  With reference to FIG. 2, the installation form of the fastening structure of this invention is demonstrated to the upper end part of the standing pipe 1. FIG. The horseshoe-shaped tightening member 3 to be attached and fitted to the upper end of the standing pipe 1 is configured to have a horseshoe shape having an inner diameter that is fitted and fitted to the outer diameter of the standing pipe 1. A lightweight material such as aluminum, which is unsuitable for welding or the like, is used. Both ends of the horseshoe-shaped tightening member 3 are opposed to each other as first and second free ends 3A and 3B, and bolt mounting holes 12 and 12 through which the tightening bolt 4 passes are formed. The tightening bolts 4 are inserted through these bolt mounting holes 12 and 12. A loosening bracket 8 is interposed between the head 4A of the bolt 4 to be inserted and the first free end. The loose bracket 8 is formed by bending the upper and lower cut-and-raised pieces and the left and right cut-and-raised pieces around the bolt mounting hole 11 to the opposite sides, and each cut and raised piece is the first of the horseshoe-shaped fastening member 3. By engaging the upper and lower surfaces of the free end and the side surface of the bolt head 4A, rotation / blind movement of the tightening bolt 4 with respect to the horseshoe-shaped tightening member 3 is suppressed.

  In the present invention, when the tightening bolt 4 is inserted into the bolt mounting holes 12, 12 of the horseshoe-shaped tightening member 3, the U-shaped rotation stopper is configured to hold the second free end 3 </ b> B of the horseshoe-shaped tightening member 3. A bracket 7 is attached. After the washer 9 is provided through the bolt mounting hole 14 on the tip screw portion 4B side of the tightening bolt 4 that has passed through the locking bracket 7, the screw tube portion 5B of the nut 5 that is rotatable by the lever 10 is screwed. The The anti-rotation bracket 7 is formed in a U-shape composed of a flat base portion 7A and upright portions 7B and 7C formed upright on both sides thereof.

  Bolt mounting holes 13 and 13 are formed in the both side standing portions 7B and 7C, respectively, and the tightening bolt 4 is inserted and inserted. In the example shown in the figure, the front rising edge of the left standing portion 7B is engaged with the slit portion 6 of the standing pipe 1 between the first and second free ends 3A and 3B of the horseshoe-shaped tightening member 3. The locking portion 7D is used. As shown by the plane of the arrow in FIG. 2, the flat base 7 </ b> A in the vicinity of the locking portion 7 </ b> D has the vertical portion 1 of the vertical pipe 1 when the locking portion 7 </ b> D is engaged with the slit portion 6 of the vertical pipe 1. An arc-shaped escape portion 7E is formed so as not to interfere with the outer peripheral surface, so that the rotation bracket 7 can be reliably attached to the standing pipe 1 via the horseshoe-shaped tightening member 3 and the tightening bolt 4. This state can be clearly understood from the cross-sectional view of FIG.

  FIG. 1A shows a cross-section in a state where the horseshoe-shaped tightening member 3 is attached to the upper end of the standing pipe 1 as described above. In the exploded perspective view of FIG. 2, the seat post 2, which is a post member to be inserted into the upper end portion of the upright pipe 1, is not shown. By tightening the nut 5 screwed to the tightening bolt 4 that is secured to the first free end 3A of the horseshoe-shaped tightening member 3 via the loosening bracket 8 with the lever 10, the first of the horseshoe-shaped tightening member 3 is tightened. When the free end 3A and the second free end 3B are close to each other, the gap between the slit portions 6 formed at the upper end of the standing pipe 1 is reduced, and the end diameter of the standing pipe 1 is reduced. As a result, the seat post 2 inserted into the upper end portion of the standing pipe 1 is tightened and tightened and fixed, and the rotational position and vertical position of the seat post 2 with respect to the standing pipe 1 are appropriately selected.

  During these tightening operations, the locking portion 7D of the locking bracket 7 attached to the tightening bolt 4 penetrating and inserted into the horseshoe-shaped tightening member 3 is effectively locked to the slit portion 6 of the standing pipe 1. Even in the tightening structure of the type in which the horseshoe-shaped tightening member is attached to and fitted to the standing pipe, the horseshoe-shaped tightening member 3 has no fear of rotating, blinding or dropping with respect to the standing pipe 1, so that the tightening work is large. Smooth and reliable with tightening force. FIG. 1B is a front view as seen from the rear of the vehicle body. The tightening bolt 4 is inserted through the horseshoe-shaped tightening member 3 and the engagement with the slit portion 6 of the locking bracket 7 attached to the tightening bolt 4 is shown. The state is clearly understood. Reference numeral 15 denotes a back hawk.

  FIG. 3 shows a second embodiment of the bicycle post member tightening structure according to the present invention. FIG. 3 (A) is a plan view and a side view of the detent bracket, and FIG. 3 (B) is a front view of the detent bracket. A side view and FIG. 3C are cross-sectional views of main parts. In the present embodiment, the bolt mounting hole 13 of the locking bracket 7 is eccentric, and the protruding amount of the locking portion 7D from the bolt mounting hole 13 is made different. As shown in FIG. 3 (B), the bolt mounting hole 13 of the U-shaped locking bracket 7 composed of a flat base portion 7A and upright portions 7B and 7C formed upright on both sides thereof is provided in the front-rear direction. It is formed eccentrically. That is, for example, for the standing portion 7C, a plate width of A (B> B) is formed on the front side and B (B> A) on the rear side. In FIG. 3C, the upper side of the drawing is the front of the vehicle body. As shown in the plan view of FIG. 3A, the plate width B side on the rear side of the vehicle body is engaged with the slit portion 6 of the vertical pipe 1 as shown in FIG. Is. Therefore, the state shown in FIG. 3 (C) is the one shown in FIG.

  As shown in FIG. 3 (C), the bolt mounting hole 13 of the anti-rotation bracket 7 is decentered and the amount of protrusion of the locking portion 7D from the bolt mounting hole 13 is made different. Even when using a horseshoe-shaped tightening member 3 having different dimensions B1 between the axis 1 and the shaft center of the bolt mounting hole 13 of the horseshoe-shaped tightening member 3, the mounting position and orientation of the locking bracket 7 should be appropriately selected. Thus, it is possible to correspond to the horseshoe-shaped tightening member 3 of various specifications. In other words, if the protruding amounts of the locking portions of the standing edges before and after the both-side standing portions in the locking bracket 7 are made different, without preparing a plurality of locking brackets of many dimensions, Before and after the locking bracket to the bolt member (the locking bracket is disposed on the rear side of the standing pipe 1 as in the embodiment of FIG. 1 or is disposed on the front side of the standing pipe 1 as in the embodiment of FIG. 3). By simply selecting the mounting position of the right and left (which of the free end portions 3A and 3B of the horseshoe-shaped tightening member 3 is held by the rotation bracket), the horseshoe-shaped tightening member 3 having various dimensions can be stopped. It becomes possible to make it correspond. As can be understood from FIG. 3A, the relief portion 7E in the rotation stop bracket 7 of the present embodiment is formed linearly and entirely in the width direction on either the front or rear side.

  As described above, the embodiments of the present invention have been described. However, within the scope of the present invention, the shape, type and material of the post member and the frame member (aluminum, appropriate steel pipe, etc.), and their target parts ( Inserting and tightening the seat post into the vertical pipe, inserting the handle post into the handle tube and tightening part, etc., slit shape, type, tightening member shape, type and material, tightening bolt shape (width, length) It is sufficient if there is a width, length, etc. with which the locking portion of the locking bracket can be engaged, but it is necessary to secure a diameter reduction allowance of the standing pipe), and the type and its tightening member Loosening form (The shape and type of the loosening washer, etc., without using the loosening washer, the noncircular head of the tightening bolt may be fitted into the corresponding recess of the tightening member), the shape of the detent bracket (U-shaped , The protruding amount of each standing edge before and after the both-side standing part constituting the locking part, the shape of the relief part, etc.), the type, and the mounting form to the tightening member (as in the embodiment, the locking bracket is any of the tightening members) It is mounted so as to hold one of the free ends, mounted with the front and rear direction changed, or mounted with the vertical direction changed, or the size of holding both free ends. A locking part that engages with the slit part of the frame member can be provided in the middle part of the locking bracket, and a mounting form to the tightening bolt (in some cases, a cross section of a part other than the screw part of the tightening bolt) The bolt mounting hole of each member may be adapted to the non-circular cross section so that rotation of the locking bracket itself with respect to the tightening bolt may be suppressed), and the eccentricity of the bolt mounting hole of the locking bracket Degree KazuSatoshi The degree or the like of the projecting amount of the locking portion can be appropriately selected.

1A and 1B show a first embodiment of a bicycle post member tightening structure according to the present invention, in which FIG. 1A is a cross-sectional view of an essential part, and FIG. FIG. Fig. 3 shows a second embodiment of the bicycle post member tightening structure of the present invention, in which Fig. 3 (A) is a plan and side view of the locking bracket, Fig. 3 (B) is a front and side view of the locking bracket, FIG. 3C is a cross-sectional view of the main part. It is explanatory drawing of the fixing device of the conventional seat post.

Explanation of symbols

1 Frame member (standing pipe, etc.)
2 Post members (seat posts, etc.)
3 tightening member 3A first free end portion 3B second free end portion 4 tightening bolt 5 nut 6 slit portion 7 rotation bracket 7A base portion 7B upright portion 7C upright portion 7D locking portion 7E escape portion

Claims (2)

In a bicycle post member tightening structure in which a tightening member is attached and fitted to the end of a frame member that is configured such that a slit portion is formed at an end where the post member is inserted to expand and contract the end diameter. A rotation bracket that forms a locking portion that engages with the slit portion of the frame member is mounted on a bolt member that tightens the tightening member, and a bolt mounting hole to the bolt member of the rotation bracket is eccentric. A bicycle post member tightening structure characterized in that the protruding amount of the locking portion from the bolt mounting hole is varied . The anti-rotation bracket is formed in a U-shape composed of a flat plate-like base portion and standing portions formed upright on both sides thereof, and the rising edges of the both side standing portions are engaged with the slit portions of the frame member. The bicycle post member tightening structure according to claim 1, wherein the structure is a stop portion.

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