JP3161066U - Seat post prevention device - Google Patents

Abstract

The present invention relates to a seat post retaining device for a bicycle, and provides a retaining device for preventing the saddle from being stolen by simply restricting the withdrawal of the seat post. SOLUTION: A screw or protrusion having an outer diameter that is equal to or slightly smaller than the slit width of the vertical pipe 1 protrudes from the lower outer peripheral side surface of the seat post, and from the opening side of the stationary ring 3 of the vertical pipe. After the seat post 8 is inserted into the standing pipe, the seat post is fixed to the stationary ring by the fastening means 4 in a state where the seat post is rotated by a certain angle in the circumferential direction with respect to the standing pipe. Accordingly, when the seat post is pulled out, the screw or the projection cannot come into contact with the inner peripheral surface of the reduced diameter portion 2 close to the stationary ring, but cannot be pulled out. [Selection] Figure 1

Description

  The present invention relates to a seat post retaining device in a bicycle, and an object thereof is to prevent the saddle from being stolen by easily regulating the withdrawal of the seat post.

  As a means to prevent the seat post attached to the bicycle saddle, a protrusion that can be locked to the inner surface of the seat post tightening portion of the standing pipe has been formed near the lower end of the seat post that has been inserted into the standing pipe. There is known one (see Japanese Utility Model Publication No. 22-22394).

  Further, a cylindrical base (7) interposed between the inner peripheral surface of the vertical pipe and the outer surface of the seat post (3) in the seat rag (4) at the upper end of the vertical pipe (1), and the seat rug (4) A seat collar (6) comprising a cover portion (10) formed integrally with the cylindrical base portion (7) is crowned, and a small screw (30) is provided on the lower side surface of the seat post (3). When the seat post (3) is pulled up to a certain height, the machine screw (30) comes into contact with the seat collar (6) to prevent it from being pulled out. A device provided with means is also known (see Japanese Patent Application Laid-Open No. 2006-315610).

Japanese Utility Model Publication No. 22-22394 JP 2006-315610 A

  However, in the thing of above-mentioned patent document 1, since it is necessary to give a projection to the lower end part of a seat post, it is necessary to form a small hole corresponding to these projections also in a standing pipe, Issues such as appearance and rusting problems and deterioration of the strength of standing pipes remain.

  Furthermore, in the thing of patent document 2, in order to insert the cylindrical base part (7) which formed the flange at the upper end between the standing pipe (1) and the seat post (3), the structure is further complicated. Moreover, in order to attach the female screw (30) to the outer peripheral surface of the lower end portion of the seat post (3), problems such as appearance and rusting or deterioration of the strength of the standing pipe remain as in the above cited reference 1.

  The present invention solves the above-mentioned problems, so that the standpipe and the seatpost itself can be used with ready-made parts without any special processing, and the seat post can be reliably removed. It is a thing.

Specifically, the diameter of the upper part of the hollow pipe is reduced, and a fixed ring body is provided with fastening means on the outer periphery of the upper end, and the axial direction of the pipe extends from the opening edge of the fixed ring body to the reduced diameter part. When a seat post is inserted and fixed in a standing pipe having a slit formed in this manner, a screw or protrusion having an outer diameter equal to or slightly smaller than the slit width of the standing pipe is provided on the lower outer peripheral side surface of the seat post. In addition to projecting, the seat post is inserted into the standing pipe from the stationary ring opening side of the standing pipe, and then the seat post is rotated by a certain angle in the circumferential direction with respect to the standing pipe, and the fastening ring is fixed by the fastening means. When the seat post is pulled out, the screw or projection abuts against the inner peripheral surface of the reduced diameter portion near the fixed ring so that the seat post cannot be pulled out. On retaining prevention device of the post.

  As described above, the retaining device of the present invention is provided with a screw or protrusion having an outer diameter that is equal to or slightly smaller than the slit width of the standing pipe on the lower outer peripheral side surface of the seat post. After inserting the seat post into the standing pipe from the opening side of the stationary ring body, the seat post is fixed to the stationary ring body by the fastening and fixing means in a state where the seat post is rotated by a certain angle in the circumferential direction with respect to the standing pipe. In spite of a simple configuration, when the seat post is pulled out, the screw or the projection cannot abut on the inner peripheral surface of the reduced diameter portion near the fixed ring.

In particular, when a ridge is used instead of a screw as a protrusion projecting on the lower outer peripheral side surface of the seat post, it is possible to reduce the number of processing steps and further reduce the manufacturing cost. As a result, it is possible to make it difficult for the saddle to be stolen by pulling out the seat post, and to improve the productivity of the bicycle with good appearance.

The principal part rear view showing the intermediate process of attachment of the seat post to the standing pipe which is one example of the present invention. The principal part side view of the bicycle in the state of FIG. The main part rear view which showed the process of the attachment of the seat post which brought the screw part of the seat post from the state of FIG. 1 to the slit lower end part of the standing pipe. FIG. 4 is a side view of an essential part of the bicycle, showing a part of a state in which the screw head is positioned on the inner peripheral side of the standing pipe by screwing from the slit of the standing pipe in the state of FIG. 3. The principal part rear view showing the state just before attachment of the seat post with respect to a standing pipe which is another Example of this invention. FIG. 6 is a main part rear view showing a process of attaching the seat post in which the seat post is inserted into the standing pipe from the state of FIG. 5 and the thread portion of the seat post is brought to the lower end of the slit of the standing pipe. In the state shown in FIG. 6, the screw head is positioned on the inner peripheral side of the vertical pipe from the slit of the vertical pipe, the seat post is rotated in the circumferential direction with respect to the vertical pipe, the saddle is directed in the use direction, and the saddle is lifted to raise the seat post. The main part side view of the bicycle which represented the part of the state which moved to the drawing-out direction in the cross section.

  Hereinafter, the specific contents of the present invention will be described based on the illustrated embodiments. In the figure, 1 is a standing pipe, 4 is a fastening means, and 8 is a seat post. Further, the standing pipe 1 has a fixed ring body 3 in which the diameter of the upper part of the hollow pipe is gradually reduced and the tightening fixing means 4 is provided on the outer peripheral side of the upper end via the reduced diameter part 2. To the reduced diameter portion 2 and have slits 3a and 3b formed along the axial direction of the pipe.

In the figure, 3c represents an enlarged portion that is enlarged circularly at the end of the slit 3b on the reduced diameter portion 2 side and the slit width is partially enlarged. The fastening and fixing means 4 is located on the outer peripheral side of the stationary ring 3 that is the upper end of the standing pipe 1 and surrounds the stationary ring 3 and has a pair of hinges protruding laterally at both ends. A fastening screw 5 is attached between the pair of hinges, and the fastening screw 5 can be tightened or loosened by a handle 6.

In the figure, 7 indicates a back hawk and 11 indicates a horseshoe lock. The upper end of the back fork 7 is fastened together with the fastening means 4 by the fastening screw 5 described above. In this case, however, the upper end portion of the back hawk 7 may be welded integrally to the side surface near the upper end of the standing pipe.

The upper end seat post 8 is a pipe having an outer diameter that is substantially the same as the inner diameter of the stationary ring 3 at the upper end of the standing pipe 1. A saddle 8 a is attached to the upper end portion, and the seat post 8. The slit 3a (slit of the fixed ring 3 part), 3b (slit of the reduced diameter part 2) formed on the lower outer peripheral side of the pipe 1 from the opening edge of the fixed ring 3 which is the upper end of the standing pipe 1 to the reduced diameter part 2 The screw 9 having an outer diameter that is equal to or slightly smaller than the slit width (in the figure, 9a represents a screw head portion larger in diameter than the slits 3a and 3b, and the screw head 9a has a spiral shape. The part is a screw 9).

In this case, instead of the screw 9, a metal bar having the same thickness as that of the screw 9 may be press-fitted and fixed, or an appropriate protrusion may be formed by driving a scissors. In the above configuration, the seat post 8 is inserted into the standing pipe 1 from the opening side of the stationary ring 3 of the standing pipe 1.

In this case, when the head 9 is attached to the lower outer peripheral surface of the seat post 8 in advance with a screw 9 or a headed ridge, the seat post outer peripheral surface and the screw head 9a of the screw 9 or the heel trunk and head The distance of the width of the fixed ring body 3 can be secured to the height of the screw or the wharf height corresponding to the distance obtained by adding the dimension of the diameter of the rising pipe 1 on the side of the standing pipe 1 reaching the slit 3b and the enlarged portion 3c. A screw 9 is screwed into the seat post 8 side, or the height of the wharf is secured.

When the seat post 8 is inserted into the standing pipe 1 from the opening side of the stationary ring 3 of the standing pipe 1, the screw 9 is aligned and inserted so as to enter along the slit 3 a of the stationary ring 3, The screws 9 are sequentially inserted from the slit 3a of the fixed ring body into the slit 3b of the reduced diameter portion 2 (see FIG. 1 and FIG. 2), and further reach the enlarged portion 3c having a larger diameter than the screw head 9a (see FIG. 3). ), The screw portion 9 reaches the slit end, and in that state, the screw head 9a is screwed from the outside of the enlarged portion 3c and is screwed into the side wall of the seat post 8 so as to be positioned on the inner peripheral side of the reduced diameter portion 2 by the tool D. (See FIG. 4).

Further, in this case, when the rivet is driven instead of the screw portion 9, the pier is driven deeper toward the seat post 8 using the striking instrument from the outside of the enlarged portion 3c. Thereafter, the seat post 8 is fixed by the fastening means 4 in a state (a chain line position in FIG. 4) in which the seat post 8 is rotated in the circumferential direction by a certain angle (180 degrees in FIGS. 1 to 4) with respect to the standing pipe 1. It is made into a use state by fixing to the stationary ring body 4.

In this state, even if the handle 6 is operated to loosen the tightening and fixing means 4 and pull out the seat post 8, the screw head 9 a or the protrusion such as a metal rod or heel is inside the reduced diameter portion 2 near the fixed ring 4. It cannot abut on the peripheral surface and pull out any more (see the chain line position in FIG. 4).

5 to 7 show another embodiment of the present invention. In this case, the diameter of the screw head 10a of the screw 10 projecting from the lower side surface of the seat post 8 is approximately equal to the width of the slits 3a and 3b formed from the stationary ring 3 to the reduced diameter portion 2 of the standing pipe 1. Since the screws 10 are equal or somewhat smaller, the screws 10 are not screwed in advance in the lower portion of the seat post 8 but are completely screwed in (see FIG. 5). The seat post 8 can be inserted into the vertical pipe 1 along the slits 3a and 3b, and when the slit end of the reduced diameter portion 2 is reached (see FIG. 6), the seat is placed against the vertical pipe 1. The post 8 can be attached more simply by rotating it by a certain angle in the axial direction.

Also in this case, a small hole is simply formed in the side surface of the seat post 8 except for the screw 10 described above, and the width is substantially the same as or slightly smaller than the width of the slits 3a and 3b. The protrusion can be formed by press-fitting a metal rod or by driving a scissors. Accordingly, even in this case, the handle 6 is operated to loosen the tightening screw 5 and pull out the seat post 8 so that the screw head 10a of the screw 10 contacts the inner peripheral surface of the reduced diameter portion 3 (see FIG. 7). It cannot be pulled out any further.

DESCRIPTION OF SYMBOLS 1 Standing pipe 2 Reduced diameter part 3 Fixed ring body 3a Slit 3b Slit 3c Enlarged part 4 Tightening fixing means 5 Tightening screw 6 Handle 7 Back fork 8 Seat post 8a Saddle 9 Screw 9a Screw head 10 Screw 10a Screw head 11 Horseshoe lock

Claims (6)

  A slit that is formed along the axial direction of the pipe from the opening edge of the fixed ring body to the reduced diameter portion, having a fixed ring body in which the upper part of the hollow pipe is reduced in diameter and provided with fastening means on the outer periphery of the upper end When a seat post is inserted and fixed in a standing pipe having a protrusion, a screw or protrusion having an outer diameter that is equal to or slightly smaller than the slit width of the standing pipe is protruded on the lower outer peripheral side surface of the seat post, and After the seat post is inserted into the standing pipe from the stationary ring opening side of the standing pipe, the seat post is fixed to the stationary ring by the tightening and fixing means with the seat post being rotated at a certain angle in the circumferential direction with respect to the standing pipe. When the seat post is pulled out, the screw or projection is in contact with the inner peripheral surface of the reduced diameter portion near the fixed ring so that the seat post cannot be pulled out. Stop prevention device.   The slit formed along the axial direction of the pipe from the opening edge of the stationary ring of the standing pipe to the reduced diameter portion is enlarged in a circle at the slit end portion on the reduced diameter portion side, and the slit width is partially enlarged. The apparatus for preventing a seat post from falling off according to claim 1.   3. The screw or protrusion protruding from the lower outer peripheral side surface of the seat post according to claim 1 or 2, wherein at least a body portion thereof has an outer diameter that is equal to or slightly smaller than a slit width of the standing pipe. A device for preventing the seat post from coming off.   The screw or projection protruding from the lower outer peripheral side surface of the seat post has a protruding tip head portion equal to the slit width of the standing pipe or having a slightly smaller outer diameter. The device for preventing the seat post from coming off.   Screws or protrusions projecting on the lower outer peripheral surface of the seat post, the body part or projecting tip head is equal to the slit width of the standing pipe, or the outer diameter is somewhat smaller, and the standing pipe is fixed 5. The seat post omission according to any one of claims 1 to 4, wherein the seat post is attached so as to project from the slit of the standing pipe to the lower outer peripheral side surface of the seat post after the seat post is inserted into the standing pipe from the ring opening side. Stop prevention device. 6. The seat post retaining prevention device according to claim 1, wherein the protrusion protruding from the lower outer peripheral side surface of the seat post is formed by driving a heel.

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