JPH0356235B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a support structure for a bicycle seat, and more particularly to one configured to allow the height of the seat to be adjusted while riding the bicycle.

[Conventional technology]

A bicycle seat is basically configured so that its height can be adjusted according to the physique of the rider. That is, at the top of the vertical pipe into which the pipe-shaped seat post that supports the seat body (saddle) is slidably inserted, there is a tightening device that can reduce the inner diameter of the upper end of the vertical pipe by operating a lever. This tightening device allows the seat post to be tightened and fixed at a desired sliding height.

[Problem to be solved by the invention]

However, the above-mentioned bicycle seat and its height adjustment mechanism simply fix the seat post that can slide inside the vertical pipe with a tightening device, so the seat height can be adjusted from the bicycle. I have no choice but to. In other words, if the tightening device is loosened, the seat post inside the vertical pipe will fall to the lower end of the sliding range due to its own weight, so for example, while holding the seat at the desired height with one hand, hold the seat post with the other hand. It is necessary to operate the tightening device by hand. In other words, adjusting the height of the seat requires both hands, and therefore, such adjustments cannot be made while the passenger is in the vehicle. On the other hand, off-road riding by mountain bikes, for example,
In road driving competitions and the like, in order to improve running ability, it is important for riders to shift their weight while riding in accordance with the topography of the road they are traveling on. That is, when traveling uphill, it is desirable for the rider to travel while shifting his/her weight forward, and when traveling downhill, it is desirable for the rider to travel while shifting his/her weight backward. In this case, raising the height of the seat makes it easier to shift your weight forward and maintaining that posture, and lowering the height of the seat makes it easier to shift your weight backwards and maintain that posture. is easy to maintain. However, if you adjust the seat height one by one after getting off the vehicle, you will waste too much time. Therefore, if the height of the seat could be adjusted while driving, the above problem would be solved and off-road driving would be extremely safe.
It is easy and versatile. For this reason, various ideas have been proposed in the past to allow the seat height to be adjusted while the passenger is in the vehicle.
Publication No. 176091 describes the saddle support (seat post)
is biased upward by a coil spring built into the frame pipe (vertical pipe), while a stop pin provided in the frame pipe is engaged and released through a plurality of stop holes provided in the longitudinal direction of the saddle support. shows a bicycle saddle height adjusting device for adjusting the height of the saddle. However, in the case of the height adjustment device shown in this publication,
The above-mentioned stop holes, etc. must be provided on the saddle support, and the above-mentioned stop pins, etc. must be provided on the frame pipe, so the above-mentioned saddle can be installed without making any changes to the existing vertical pipe and seat post configuration. No support structure can be constructed. That is, when configuring the support structure for the saddle, the existing bicycle cannot be used as is. In other words, it would be very convenient for both manufacturers and users if it were possible to construct a seat support structure that allows the height position of the seat to be adjusted while riding the bicycle without requiring changes to the conventional bicycle configuration. . The present invention was devised under the above circumstances, and provides a bicycle seat that allows the height of the seat to be adjusted while riding without requiring almost any changes to the configuration of conventional bicycles. Its purpose is to provide a supporting structure for

[Means to solve the problem]

In order to solve the above problems, the present invention takes the following technical measures. That is, the bicycle seat support structure of the present invention is configured such that the seat post, which is slidably inserted into the upright pipe, can be fixed at a desired sliding position by the tightening device provided at the top of the upright pipe. A support structure for a bicycle seat, which includes a seat support rod having a predetermined length, and a large-diameter rod that is substantially fixedly provided above the seat support rod and has an outer diameter that corresponds to the inner diameter of the seat post. By operating the lock portion and an operating portion provided at an appropriate portion of the seat support rod, a pressing force in the axial direction is applied to the large diameter lock portion, thereby substantially increasing the outer diameter of the large diameter lock portion. A vertical pipe fixing body having a locking mechanism that can be increased in size, and a vertical pipe fixing body that is inserted into the lower part of the seat support rod so that the lowermost position thereof can be relatively slidable but not relatively rotatable, and that has an engagement hole in the outer peripheral wall. and a compression coil spring inserted between the large-diameter lock portion and the vertical pipe fixing body while being inserted into the seat support rod, the seat adjuster The device is connected to the lower end of the seat post by inserting the large diameter lock portion into the seat post and activating the lock mechanism, and the seat post and seat adjuster device thus connected are inserted into the vertical pipe. , the seat is supported by the vertical pipe by engaging an adjuster support member that is removably provided at a predetermined portion of the vertical pipe into the engagement hole of the vertical pipe fixing body inserted into the vertical pipe; It is characterized by the fact that

[Action and effect]

In the seat support structure of the present invention, the seat post is basically attached to the bicycle by fixing it to the upright pipe using a tightening device provided on the upright pipe, as in conventional general bicycles. Installed. In the present invention, the installation of the seat post to the vertical pipe is achieved by connecting the seat adjuster device to the lower end of the seat post, inserting these into the vertical pipe, and attaching the seat post to the vertical pipe. This is done with an adjuster support member provided at a predetermined portion of the vertical pipe inserted into the engagement hole of the pipe fixing body, so that the seat post is supported by the vertical pipe via the seat adjuster device. To connect the above seat adjuster device and seat post, insert the large-diameter lock portion of the seat adjuster device into the seat post, and operate the operating portion provided at the appropriate portion of the seat support rod to activate the lock mechanism. This is done by activating it. That is, since the large diameter lock portion normally has an outer diameter corresponding to the inner diameter of the seat post, it can be inserted into the seat post without any problem before the lock mechanism is activated.
Thereafter, by operating the lock mechanism, its outer diameter is increased, so the outer surface of the large diameter lock portion is stretched against the inner surface of the seat post, and the frictional force causes the seat adjuster to be pushed into the seat. It can be fixed to a post. Then, insert the seat post and seat adjuster device connected as described above into the vertical pipe, and insert the adjuster support into the engagement hole of the vertical pipe fixing body of the seat adjuster device installed inside the vertical pipe. By engaging the member, the seat post and the seat adjuster device can be supported by the vertical pipe. Due to the engagement between the engagement hole and the adjuster support member, the vertical pipe fixing body is supported and fixed to the vertical pipe, and the large diameter lock portion directly connected to the seat post and the large diameter The seat support rod, which is substantially fixed to the large-diameter lock part and is slidable relative to the vertical pipe fixing body, supports the vertical pipe via a compression coil spring interposed between the large-diameter lock part and the vertical pipe fixing body. This is because it will be supported by a fixed body. That is, the seat post and the seat support rod connected thereto are slidably supported by the vertical pipe fixing body and the vertical pipe while being biased upward by the compression coil spring. Note that the vertical pipe fixing body is inserted into the sleeve with its lowest end position regulated with respect to the seat support rod, so in other words, the uppermost sliding position of the seat support rod with respect to the vertical pipe fixing body is restricted. Therefore, the seat support rod will not come out of the vertical pipe fixing body. Then, the seat is fixed by pressing the top surface of the seat downward to push down the seat post (and the large-diameter lock portion or seat support rod) by a desired amount against the elastic biasing force, and then the tightening device This is done by operating the seat post and fixing it against the vertical pipe. In the case of the seat support structure of the present invention in which the seat post is attached to the vertical pipe as described above, the height of the seat can be adjusted while riding by loosening the tightening device with one hand and moving the buttocks up and down. After the height of the seat is set at a desired position, the seat post may be fixed using a tightening device. When the tightening device is loosened, the seat body and seat post (and the large-diameter lock portion and seat support rod) move upward due to the biasing force of the compression coil spring, so if you lift your buttocks, the seat will follow suit. If you apply your weight to the seat, you can push the seat down against the biasing force. Therefore, the height of the seat can be adjusted with only one hand, so the height of the seat can be adjusted safely even while riding. Further, the seat post is fixed to a large-diameter lock portion and a seat support rod, and the seat support rod is inserted through a vertical pipe fixing body fixed to the vertical pipe so as not to rotate relative to the vertical pipe. Therefore, since the seat post does not rotate relative to the vertical pipe, the orientation of the seat can be kept constant during adjustment of the seat height. In other words, to avoid inadvertently rotating the seat post and changing the orientation of the seat, make sure to
There is no need to correct the orientation of the seat, and the height can be adjusted safely and easily while riding. Furthermore, as described above, the seat support rod is prevented from coming off the vertical pipe fixing body, and the seat post is connected and fixed to the seat support rod. Therefore, even if the tightening device is loosened without holding the seat in any way, the seat post will not fall out of the vertical pipe due to the elastic force of the compression coil spring. This allows, for example,
To effectively prevent injury caused by the seat hitting the face when the tightening device is inadvertently tightened with the face positioned above the seat. Further, since the seat adjuster device and the seat post are connected and fixed by a locking mechanism constructed on the device side, there is no need to provide any new mechanism on the seat post side. Therefore, in configuring the seat support structure of the present invention, an existing seat post can be used as is. Furthermore, for example, in the case of mountain bikes, touring cars, etc., bolts for attaching the bottle cage to the vertical pipe are generally installed, and in the case of such bicycles, the bolts are attached to the vertical pipe fixing body. It can be used as an adjuster support member for supporting and fixing to a vertical pipe. In this case, there is no need to make any changes to the configuration of not only the seat post but also the vertical pipe, so that the seat support structure of the present invention can be constructed by using the conventional bicycle as is. Note that the bottle cage is a bolt holder for holding a bottle container for storing drinking water or the like.

[Explanation of Examples]

Embodiments of the present invention will be specifically described below with reference to the drawings. The present invention is applied to conventional general bicycles. That is, as shown in FIGS. 1 and 5, a tightening device 4 is provided at the upper end of the vertical pipe 1, and by operating a lever 5 of this tightening device 4, the seat body is attached to the upper part. 6
A pipe-shaped seat post 7 which is supported and slidably inserted into the vertical pipe 1 can be fixed to the vertical pipe 1. In addition, in this example, a cage mounting bolt 2 for attaching a bottle cage (not shown) to the vertical pipe 1 as shown in FIG. This figure shows a case where the present invention is applied to a bicycle. Note that the above cage mounting bolts 2 are usually attached to the vertical pipe 1.
It is provided at two places in the vertical direction, and is screwed onto a boss nut 3 fixed to the vertical pipe 1. Now, in this example, the tightening device 4 is configured as follows. That is, on the outer peripheral wall of the upper end of the vertical pipe 1,
As shown in FIGS. 1 and 5, a split groove 8 of a predetermined length is formed from the upper end, and a pair of ears 9, 9 facing each other with the split groove 8 in between are provided. A shaft body 10 having a threaded portion 10a at one end and a head 10b at the other end is inserted into the through holes 9a, 9a formed in the ear pieces 9, 9. A nut 11 is screwed into the threaded portion 10a of the shaft body 10, and a pressing cap 12 is mounted on the head 10b, which is forcibly moved in the axial direction of the head 10b by rotation of the lever 5. is covered. The lever 5 has a camshaft portion 5a that is inserted through the press cap 12 and the head portion 10b of the shaft body 10 in a direction perpendicular to the axis, and an arm portion 5b that is bent into a substantially L-shape with respect to the camshaft portion 5a. In addition, the camshaft portion 5a
rotates around the shaft support hole 12a of the press cap 12, but the cam portion inserted through the through hole 10c of the head 10b is eccentric to the rotation center, that is, the shaft support hole 12a. It is being Therefore, when the lever 5 is rotated, the cam portion pivoting about the rotation axis forcibly moves the shaft body 10 in the axial direction relative to the pressing cap 12. This means that by rotating the lever 5, the distance between the nut 11 and the pressing cap 12 can be increased or decreased, and therefore the distance between the ear pieces 9, 9 can be increased or decreased. It is. In this case, when the lever 5 is rotated in the tightening direction to reduce the distance between the ear pieces 9, 9, the inner diameter of the upper end of the vertical pipe 1 is reduced, and the inner peripheral surface of the vertical pipe 1 is aligned with the seat post. The seat post 7 can be fixed to the vertical pipe 1 by stretching the outer peripheral surface of the seat post 7. Conversely, when the lever 5 is rotated in the loosening direction, the distance between the ear pieces 9, 9 is expanded by the elastic return force of the vertical pipe 1, and the seat post 7
is in a state where it can slide freely. In the present invention, such attachment of the post 7 to the vertical pipe 1 is carried out with the seat post 7 supported by the vertical pipe 1 via the seat adjuster device 13 installed inside the vertical pipe 1. be exposed. The configuration of the seat adjuster device 13 will be described below. The seat adjuster device 13, as shown in FIGS. 1 and 2, includes a seat support rod 14 having a predetermined length. In this example, a square rod with a square cross section is used as the seat support rod 14, and screw portions 14a and 14b having a predetermined length from the shaft end are formed on the outer periphery of both the upper and lower ends, respectively. . Even if it is a square bar, you can form a threaded part in the same way as a round bar by selecting the thread size according to the size of the bar. For example, if the size is 5□, M6 (mounted All you need to do is cut a screw with a diameter of 6 and a root diameter of 4.917. Further, a large diameter lock portion 15 having an outer diameter corresponding to the inner diameter of the seat post 7, in other words, a large diameter lock portion 15 that can be inserted into the seat post 7 in a normal state is attached to the upper part of the seat support rod 14 in a substantially fixed manner. It is being In the case of this example, this large diameter lock portion 15
is constituted by an annular rubber body 15a having a predetermined length in the axial direction and slidably inserted into the seat support rod 14. Further, the seat support rod 14 is provided with a locking mechanism 16 that can apply an axial pressing force to the large diameter lock part 15 to increase the outer diameter of the large diameter lock part 15. This locking mechanism 16 has an axial threaded hole 17a and a tightening seat body 17 that is screwed onto the upper threaded portion 14a of the seat support rod 14, and above the tightening seat body 17, the upper and lower parts of the rubber body 15a are connected to each other. A pair of upper and lower support plates 18a and 18b are provided which are slidably inserted into the seat support rod 14 so as to be narrower. Further, a stopper nut 19 is screwed onto the upper threaded portion 14a of the seat support rod 14 above the upper support plate 18a, and when the stopper nut 19 is squeezed between the stopper nut 19 and the tightening seat body 18, The axial movement of each support plate 18a, 18b and the rubber body 15a relative to the seat support rod 14 is restricted. The shaft holes of the support holes 18a, 18b and the rubber body 15a are square holes corresponding to the seat support rods 14, so that the support holes 18a, 18b and the rubber body 15a can Rotation relative to the support rod 14 is prevented. In the locking mechanism 16 of this example, when the tightening seat body 17 is screwed and moved upward, the both support plates 18a, 18
The distance b is reduced, thereby compressing the rubber body 15a in the axial direction. Due to the deformation of the rubber body 15a compressed in this manner, the outer diameter of the axially intermediate portion thereof increases as shown by the imaginary line in FIG. 3. Therefore, when the large-diameter lock portion 15 is inserted into the seat post 7 and the above-described operation is performed, the outer surface of the rubber body 15a will be stretched against the inner peripheral surface of the seat post 7, and due to the friction, The large diameter lock portion 15 can be connected and fixed to the seat post 7. Further, in this case, since the large diameter lock portion 15 is fixed to the seat support rod 14, the seat support rod 14 is also fixed to the seat post 7. That is, the large diameter lock portion 15
and a seat support rod 14 that supports and fixes it.
is connected and fixed to the seat post 7. Note that the screwing operation of the tightening seat body 17 can be performed with the seat support rod 14 held and fixed with a spanner or the like, and in the case of this example, since the seat support rod 14 is a square rod, The seat support rod 14 can be easily held and the above-mentioned screwing operation can be performed easily. Further, the tightening seat body 17 has a pair of diametrically opposed flat surfaces 17c on the outer periphery of its base end flange 17b, as shown in FIG. 2, for example.
17c is preferably formed. When screwing the tightening seat body 17 using a tool such as a spanner, the flat surfaces 17c, 17c can be used as tool contact surfaces, thereby making it easier to screw the tightening seat body 17. This is because the operability of the device is improved. Further, a substantially annular vertical pipe fixing body 20 having an outer diameter approximately corresponding to the inner diameter of the vertical pipe 1 is inserted into the lower part of the seat support rod 14 so as to be relatively slidable therein. A stopper nut 21 for preventing the vertical pipe fixing body 20 from coming off the seat support rod 14 is installed below the seat support rod 14.
It is screwed onto the lower threaded portion 14b of. As shown in FIG. 4, the vertical pipe fixing body 20 has a shaft hole 20a through which the seat support rod 14 is inserted, which is made into a square hole corresponding to the seat support rod 14. to prevent relative rotation. In addition, the vertical pipe fixing body 2
As shown in FIGS. 1, 2, and 4, the outer circumferential wall of No. 0 is formed with a boss nut engagement groove 20c extending in the axial direction and having a support wall portion 20b at the upper end and opening at the lower end. At the same time, the bottom wall of the boss nut engagement groove 20c is provided with the shaft through hole 20a.
An engagement hole 20d in the form of a radial threaded hole is bored through the radial direction. Furthermore, the vertical pipe fixing body 20
A boss nut passage groove 20e is formed over the entire length in the axial direction at a portion of the outer peripheral wall that is displaced in the circumferential direction from the boss nut engagement groove 20c. A compression coil spring 22 is inserted between the vertical pipe fixing body 20, the tightening seat body 17 and the large diameter lock portion 15, and the upper and lower ends thereof are tightened. It is interposed so as to be in contact with the lower surface of the seat body 17 and the upper surface of the vertical pipe fixing body 20, respectively. That is, the seat adjuster device 13 of this example
A large-diameter lock portion 15 whose outer diameter can be increased by a lock mechanism 16 is substantially fixed to the upper portion of the seat support rod 14. Further, the seat support rod 14 and the large diameter lock portion 15 are able to slide relative to the vertical pipe solid body 20 while being biased upward by a compression coil spring 22. Next, a description will be given of the seat mounting method of this example in which the seat post 7 is mounted to the vertical pipe 1 using the seat adjuster device 13 described above. First, the large-diameter lock portion 15 of the seat adjuster device 13 is inserted into the seat post 7, and then the lock mechanism 16 is activated by rotating the operating portion such as the base end flange portion 17b of the tightening seat body 17. let As a result, as described above, the rubber body 1
By increasing the outer diameter of the rubber body 15a, the large diameter lock part 15 can be connected and fixed to the lower end of the seat post 7 by the tension between the outer surface of the rubber body 15a and the inner peripheral surface of the seat post 7. The lock portion 15 and the seat support rod 14 are now fixed to the seat post 7. Next, as shown in FIG. 1, the seat post 7 and the seat adjuster device 13 connected in this way are
Insert into vertical pipe 1. In this case, the boss nut engagement groove 20c of the vertical pipe fixing body 20 and the boss nut 3 are aligned in the circumferential direction so that the boss nut 3 slides into the boss nut engagement groove 20c, and Groove 2
Insert the seat post 7 and the seat adjuster device 13 until the support wall portion 20b at 0c contacts the boss nut 3. After that, the cage mounting bolt 2, which has been unscrewed from the boss nut 3 in advance, is inserted into the engagement hole of the vertical pipe fixing body 20.
Screw into 0d. Thereby, the vertical pipe fixing body 20 is connected to the cage mounting bolt 2 and the above-mentioned engagement hole 2.
It is fixed to the vertical pipe 1 by engagement with 0d. Further, the seat support rod 14 and the seat post 7 connected and fixed thereto via the large-diameter lock portion 15 are fixed to the vertical pipe via the compression coil spring 22 while receiving an upward biasing force from the compression coil spring 22. 20 bodies or 1 vertical pipe
It will be supported by. After the seat post 7 and seat adjuster device 13 have been inserted into the vertical pipe 1, the seat post 7 can be moved against the urging force by pressing the top surface of the seat body 6. When the height of the seat is determined, the seat post 7 may be fixed to the vertical pipe 1 by operating the tightening device 4. Note that when the length of the seat post 7 is relatively long, in order to prevent the biasing force of the compression coil spring 20 against the seat post 7 from becoming too large, one of the pair of upper and lower cage mounting bolts 2, 2 is used. , Use the lower cage mounting bolts 2 to attach the vertical pipe fixing body 20 to the vertical pipe 1.
It is recommended to fix it to . In this case, if the seat adjuster device 13 is inserted into the vertical pipe 1 with the circumferential positions of the boss nut passage groove 20e and the boss nut 3 aligned, the vertical pipe fixing body 20 can be placed on the lower side of the upper boss nut 3. After that, the seat adjuster device 13 may be further inserted so that the boss nut engagement groove 20c and the lower boss nut 3 are aligned in the circumferential direction. Furthermore, as shown in FIG.
The size of the engagement hole 20 is slightly larger than the size of 4.
If the cage mounting bolt 2 is provided eccentrically so that the radius length on the opposite side to d is slightly larger, the length of the cage mounting bolt 2 is relatively long and its tip is connected to the shaft through hole 20a.
Even if they protrude inward, interference between the cage mounting bolts 2 and the seat support rods 14 inserted through the shaft holes 20a can be effectively prevented. That is, due to the above interference, the seat support rod 14
If the smoothness of sliding relative to the vertical pipe fixing body 20 is hindered, the problem will not occur. Now, in the seat support structure of this example configured as described above, the height of the seat can be adjusted while the rider is riding in the vehicle, and this is done as follows. That is, after loosening the tightening device 4 by rotating the lever 5 of the tightening device 4 with one hand, move the buttocks up and down to determine the seat position, and then use the tightening device 5 to raise the seat post 7 again. It is fixed to pipe 1. Loosen the tightening device 4,
When you lift your buttocks, the seat support rod 14 and seat post 7, which are biased upward by the compression coil spring 22, automatically move upward following the movement of your buttocks, and also transfer your weight to the seat. This is because the sheet can be pushed down against the elastic urging force. Further, the seat support rod 14 cannot rotate relative to the vertical pipe fixing body 20, and the vertical pipe fixing body 20 is fixed to the vertical pipe 1.
Therefore, the seat post 7 fixed to the seat support rod 14 does not rotate relative to the vertical pipe 1, so the orientation of the seat does not change during seat height adjustment, and the seat position remains unchanged. Adjustments can be made easily and safely. Furthermore, the stopper nut 21 prevents the vertical pipe fixing body 20 from coming off the seat support rod 14.
That is, the seat support rod 14 does not separate from the upright pipe fixing body 14 fixed to the upright pipe 1, so even if the tightening device 4 is loosened and the seat is not held at all, the seat post 7 remains attached to the upright pipe 1. From the above compression Koito spring 2
It won't jump out due to the spring force of 2. Therefore, even if the user inadvertently loosens the tightening device 4 by positioning his or her face above the seat, the seat may fly out from the vertical pipe and hit the user's face, causing injury. Prevented. Moreover, the connection between the seat post 7 and the seat adjuster device 13 is performed using the mechanism on the device side, and the seat post does not require any modification at all, and a conventional one can be used as is. Further, in this example, the adjuster support member used to fix the vertical pipe fixing body 20 to the vertical pipe 1 utilizes the cage mounting bolts 2 and boss nuts 3 that are originally provided on the vertical pipe 1. Therefore, there is no need to provide any special mechanism in the vertical pipe 1. Therefore, in the case of this example, the seat support structure of the present invention can be applied as is to a conventional bicycle without requiring any changes in its configuration. Furthermore, in this example, the vertical pipe fixing body 20 is engaged and supported by the boss nut 3 in addition to the cage mounting bolt 2, so that the support for the vertical pipe fixing body 20 can be sufficiently stabilized. can. Therefore, no inconvenience occurs even if the user puts his or her weight on the seat while adjusting the height of the seat.
Note that even when using a single adjuster support member, if a relatively large adjuster support member is used, support and stabilization of the vertical pipe fixing body 20 can be handled without any problem. By the way, the scope of the present invention is not limited to the above-described embodiments. For example, the large diameter lock portion 15 and lock mechanism 16 may be constructed as shown in FIG. That is, in this example, a pipe-shaped body 15b, which has an outer diameter corresponding to the inner diameter of the seat post 7 and is inserted into the seat support rod 14 in a relatively non-rotatable manner, is used as the large-diameter lock portion 15. It is interposed between 18a and the tightening seat body 17. This pipe-shaped body 15b has a plurality of slits 15c extending in the axial direction from the lower end formed at appropriate intervals in the circumferential direction on its outer circumferential wall. The diameter is configured to increase elastically. Further, between the pipe-shaped body 15b and the tightening seat body 17, a truncated cone-shaped push-up foot 23 is inserted into the seat support rod 14 so as to be slidable but not relatively rotatable. When the tightening seat body 17 is screwed to move the push-up foot 23 upward, the slope effect of the outer peripheral surface of the push-up foot 23 causes the pipe-shaped body to
The outer diameter of 5b can be increased. Therefore, by performing the above-described operation with the large-diameter lock portion 15 inserted into the seat post 7, the large-diameter lock portion 15 and the seat support rod 14 can be connected and fixed to the seat post 7. . Note that, as described above, instead of configuring the push-up foot separately, the push-up foot portion may be provided integrally with the tightening seat body 17. In addition, in the present invention, the vertical pipe fixing body is inserted into the seat support rod so that it cannot rotate relative to the seat support rod. In order to make the sliding movement relative to the fixed body smoother, the shaft hole of the vertical pipe fixed body should be made slightly larger than the diameter of the seat support rod, as long as the wobble of the seat is acceptable. It is also permissible to do so. Further, in the case of the above embodiment, the engagement hole 20d is a through hole, but it goes without saying that it may be a simple hole. Furthermore, it goes without saying that the tightening device is not particularly limited to that shown in the above embodiments, and may be configured such that the inner diameter of the upper part of the vertical pipe can be reduced by some kind of operating device. That's fine.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention;
FIG. 2 is a perspective view of the seat adjuster device according to the embodiment, FIG. 3 is a sectional view illustrating the operation of the lock mechanism of the seat adjuster device, and FIG. 4 is the −− of FIG.
5 is a sectional view of a tightening device according to an embodiment, and FIG. 6 is a sectional view showing a large diameter lock portion according to another embodiment. DESCRIPTION OF SYMBOLS 1... Vertical pipe, 2... Adjuster support member (cage mounting bolt), 3... Adjuster support member (boss nut), 4... Tightening device, 7... Seat post, 13... Seat adjuster device, 14... Seat support rod, 15 ...Large diameter lock portion, 16...Lock mechanism, 20...Vertical pipe fixing body, 20c...Engagement hole (boss nut engagement groove), 20d...Engagement hole, 2
2...Compression coil spring.

Claims (1)

[Claims] 1. A support for a bicycle seat configured such that a seat post slidably inserted into a vertical pipe can be fixed at a desired sliding position by a tightening device provided at the top of the vertical pipe. The structure includes a seat support rod having a predetermined length, a large-diameter lock portion that is substantially fixedly provided above the seat support rod and has an outer diameter corresponding to the inner diameter of the seat post, and the seat support rod. A lock capable of substantially increasing the outer diameter of the large-diameter lock portion by applying an axial pressing force to the large-diameter lock portion by operating an operating portion provided at an appropriate portion of the support rod. a mechanism, a vertical pipe fixing body that is inserted into the lower part of the seat support rod so that it can be relatively slidable but not relatively rotatable with its lowest end position being regulated, and has an engagement hole in its outer peripheral wall; A seat adjuster device is provided with a compression coil spring interposed between the large diameter lock portion and the vertical pipe fixing body in a state that the seat adjuster device is inserted into the large diameter By inserting the shaped lock part into the seat post and activating the lock mechanism, it is connected to the lower end of the seat post, and the seat post and seat adjuster device connected in this way are inserted into the vertical pipe, and the seat post is inserted into the vertical pipe. The seat is supported by the vertical pipe by engaging an adjuster support member detachably provided in the vertical pipe into the engagement hole of the vertical pipe fixing body inserted into the vertical pipe. Features: Bicycle seat support structure.