TWM544448U - Comfortable and flexible bicycle seat-post with triple curvatures design - Google Patents

Abstract

A comfortable and flexible bicycle seat-post with triple curvature design for constituting a bicycle seat tube assembly to reduce the vibration originated from the bicycle wheels and transmitted to the bicycle rider is disclosed to include a first seat-post wall having a first radius of curvature R1 and an arc length less than [pi]R1, a second seat-post wall having a second radius of curvature R2, R2 > R1, and a third radius of curvature R3 defined the two opposite ends of the second seat-post wall that are respectively connected to the two opposite ends of the first seat-post wall, and thus, the bicycle seat-post exhibits the shape of a non-circular tube. By means of utilizing the geometrical characteristic that the inertial moment of forward bending is relatively smaller than the inertial moment of lateral bending, the seat post has a relatively larger flexibility to weaken the vibration and to make the rider feel supple and comfortable when the rider is forced to bend the body forward and backward during riding.

Description

Comfortable seatpost for bicycle with high deflection and three curvature section

This creation relates to bicycles, in particular to a high-flexion bicycle seatpost that is configured to be coupled to the seat tube of the frame to reduce the vibration transmitted to the bicycle rider for the purpose of riding comfort.

Design of high-performance bicycles In addition to factors such as lightweight and air resistance, the comfort of suspension and riding is also considered to be a very important performance appeal. Road rides and long-distance rides often cause the rider to feel uncomfortable and tired; especially when riding a mountain bike on a hillside terrain, the shock is swayed by the Wheel and the Frame. The seat (Seat Post) is passed to the seat cushion (Saddle), causing the rider's ankle to be very uncomfortable.

Although the use of Vibration Damping is better than Carbon Fiber Reinforced Plastics (CFRP) in the selection of materials for high-performance bicycles, the requirements for comfort are still not met, and vibration may still occur. It is transmitted to the rider through the frame and seatpost made of CFRP, resulting in discomfort. Therefore, how to improve these components, especially the configuration of the seatpost, has become the goal of all brands. In a modification, for example, US Patent No. 9,039,024 B1, discloses a seatpost section between a connecting seat cushion and a frame seat tube, which is a design of a radius of curvature of a general full-circle tube, intended to change the seatpost arc type. The curvature (Curvature) is used to further increase the shock absorption. The shape of the seat post is divided into two parts, as shown in Fig. 1, the first part is an arc of curvature radius r ₁ (Arc). The length of the arc (Arc length) is greater than or equal to πr ₁ (half circumference) and less than 2π r ₁ (full circumference); the second portion is joined to the first portion, the radius of curvature is r ₂ , and r ₂ > r ₁ . The problem is that the second portion of the seat post arc length r ₂ is no backing and the seat tube (Seat tube) contacting (Business Card), this can be illustrated with reference to FIG its front and rear swing rider does not have sufficient support of the reaction force, Relatively unstable; when moving in the riding direction, the backward swing is only 2 times the arc length of αr ₁ is in contact with the seat tube. The arc length is much smaller than the half circumference ( πr ₁ ), and the weight of all riders is Applying force to this area (theoretically the area shared by 2 αr ₁ ) causes the stress (Stress) in this area to become much higher, and the seat post is easily deformed and damaged. In actual use, if the seat post is made of carbon fiber composite (CFRP), this design is more because the stress concentration factor of the CFRP material is higher than that of the metal aluminum. The contact surface of the seat rod contacting the seat tube is more likely to be damaged. There is no pragmatic effect on the application.

Based on the above, the inventors provide a comfortable seatpost for a bicycle having a high-deflection three-curvature section, the upward end of the seatpost is connected to a pad of a bicycle, and the other end of the seatpost is connected to the frame of the bicycle. By using the geometric characteristics of the bicycle riding direction, the forward bending moment of inertia (Inertia moment) is small and the lateral bending moment of inertia is large, so that the seat rod has greater flexibility when the rider bends back and forth. When the side turns, the seat post still retains the bending rigidity of the nearly round pipe, and does not affect the energy efficiency when turning.

The present invention is a bicycle seatpost having a three-curvature section, as shown in FIG. 2, comprising: a first pole wall having an arc of a first radius of curvature R1, the arc length being less than π R 1 The first rod wall is disposed in a forward direction toward a bicycle; a second rod wall having a second radius of curvature R2, the second radius of curvature R2 being greater than the first radius of curvature R1 The second rod wall is disposed in a direction toward the rear end of the bicycle; a third radius of curvature R3 is connected to both ends of the first rod wall by the two end portions of the second rod wall As defined by the portion, the third radius of curvature R3 <the first radius of curvature R1; the bicycle travels on the ground, and the seatpost of the present invention is configured to reduce ground impact feedback from the bicycle wheel and transmit it to the bicycle rider. Vibration, compared to the seat frame of the existing frame, the rider feels the softness of the creative seatpost and the comfort of riding.

The seat post or the connected frame and the seat tube thereof and the like may be constructed as a composite of a plurality of layers of Carbom fiber materials in a resin substrate, such as a carbon fiber prepreg (Prepreg) ) stacked up. Other suitable materials and/or construction methods may also be used in the present invention, as those skilled in the art can understand and implement.

The following embodiments are in which the second radius of curvature R2>the first radius of curvature R1 (or the third radius of curvature R3<the first radius of curvature R1<the second radius of curvature R2), wherein the arc length of the first radius of curvature R1 is less than πR 1.

In an embodiment of the present invention, the seat post is coupled to a frame that is an extension of the seat tube of the frame.

In an embodiment of the present invention, the seat post is combined with a shim support (Back-up) in a space of a circular seat tube of a frame (with respect to a circular arc portion of the second radius of curvature R2) to improve riding. Time stability and safety.

In an embodiment of the present invention, the shape of the seat tube is changed without using a spacer, so that the three-curvature design of the seat post is matched with the cross-section of the seat tube to combine the three-curvature seat post.

This design can be designed according to the requirements of the rider to design a first radius of curvature R1, a second radius of curvature R2, and a third radius of curvature R3, which can be designed to be smaller in the positive moment of inertia. When there is a large amount of deformation, it can absorb a large vibration and make the rider feel comfortable. The distance between the first radius of curvature R1 and the second radius of curvature R2 is adjustable. The parameter, this parameter can be adjusted by the arc length of the third radius of curvature R3. This D value must be adjusted to the strength of the material, otherwise the seatbar that is too "soft" cannot be damaged by the weight of the rider. Designed according to the diameter of the current CFRP bicycle seat tube, the D value of the present invention is experimentally obtained to be about 25 ± 5 mm, preferably in a test case of 25 ± 3 mm (adult car), more preferably 25 mm.

1‧‧‧ seatpost

11‧‧‧First pole wall

13‧‧‧Second wall

15‧‧‧shims

3‧‧‧Cushion

5‧‧‧ frame

51‧‧‧Upper tube

53‧‧‧Under the tube

54‧‧‧ head tube

55‧‧‧ seat tube

550‧‧‧round opening

551‧‧‧Three-curvature section opening

57‧‧‧Back fork

59‧‧‧ rear fork

R1‧‧‧first radius of curvature

R2‧‧‧second radius of curvature

R3‧‧‧ third radius of curvature

IM‧‧‧ Forward bending moment of inertia

Distance between D‧‧‧R1 and R2 arcs

Figure 1 is a cross-sectional view of a prior art seatpost.

Figure 2 is a perspective view of the seatpost combined with the frame and the seat.

Figure 3 is a perspective view of the seatpost.

Figure 4 is a schematic cross-sectional view of the third figure of the seatpost along the section AA.

Figure 5 is an exploded perspective view of the circular seat tube of the seatpost, gasket and frame.

Figure 6 is a perspective view of the seat post of Figure 5, which is fixed in the circular seat tube of the frame by a gasket backing.

Figure 7 is a perspective view of the seatpost tube of the present invention combined with a frame having the same three-curvature cross section.

Features, aspects, and advantages of the present invention are described with reference to the drawings of a preferred embodiment, which is intended to illustrate and not to limit the present invention.

Please refer to Figure 3 and Figure 4 for carbon fiber CFRP based on high-toughness epoxy resin. Different laminates can be designed to achieve light weight and different softness according to the requirements of the rider. A seat bar that will rupture, showing a rod 1 having a first radius of curvature R1, a second radius of curvature R2, and a third curvature half along a cross-sectional view taken perpendicular to the longitudinal axis of the seatpost (Fig. 4). The diameter R3, the third radius of curvature R3 < the first radius of curvature R1 < the second radius of curvature R2. As shown in the figure, the seat post 1 is a thin-walled hollow structure to reduce the weight, and the geometrical characteristics of the forward bending moment of inertia IM (Inertia Moment) and the lateral bending moment of inertia of the bicycle riding direction are utilized. When the rider flexes before and after the force, there is greater flexibility of the seatpost, while the lateral turning seatpost still retains the bending rigidity of the round pipe, which does not affect the energy efficiency when turning, the seatpost 1 and the frame The seat tube assembly can be configured to improve the comfort of the knight and the vertical compliance of the bicycle frame.

Referring to FIG. 2, FIG. 3, and FIG. 4, a three-curvature cross-section bicycle seatpost 1 includes a first pole wall 11 having a first radius of curvature R1. The arc length is less than π R ₁ , the first rod wall 11 is disposed toward the front end of a bicycle; and the second rod wall 13 has a second radius of curvature R2, the second radius of curvature R2 More than the first radius of curvature R1, the second rod wall 13 is disposed in a direction toward the rear end of the bicycle; a third radius of curvature R3 is connected to the two ends of the second rod wall 13 respectively The first rod wall 11 is defined by the two ends, the third radius of curvature R3<the first radius of curvature R1; the upper end of the seat rod 1 is connected to a pad 3 of a bicycle, and the seat rod 1 is downward. The other end is connected to the bicycle frame 5, and the bicycle travels on a ground. The seatpost 1 of the present invention is configured to reduce the vibration caused by the ground impact of the bicycle wheel and transmitted to the rider, compared to the existing vehicle. The seatpost rider realizes the flexibility of the seatpost and the comfort of riding.

In the embodiment, the distance between the first radius of curvature R1 of the first rod wall 11 and the second radius of curvature R2 of the second rod wall 13 is a D value, which is used for comfort adjustment. The parameter can be adjusted by the arc length of the third radius of curvature R3. The value of D must be adjusted with the strength of the material. Otherwise, the seat bar that is too "soft" cannot be damaged by the weight of the rider. The third curvature radius R3 is adjusted to be smaller in arc length, the D value is also smaller, and the moment of inertia is smaller, the seat post 1 Further, the arc length of the third radius of curvature R3 is adjusted to be large, the D value is also increased, and the moment of inertia is increased, and the seat post 1 is more rigid.

According to the diameter of the current bicycle CFRP seat tube, the D value is experimentally obtained, and the D value is 25±5 mm; wherein the D value is preferably 25±3 mm (adult car); the D value is better. It is 25mm.

Referring to FIG. 2 , an embodiment of the present invention, wherein the seat post 1 is further combined with a bicycle, the bicycle includes a pad 3 , a frame 5 , and an upward end of the seat bar 1 is coupled to the seat pad 3 , The other end of the seatpost 1 is coupled to the frame 5.

In the foregoing embodiment, the frame includes a tube 55, and the other end of the seat rod 1 is coupled to the seat tube 55. The seat tube 55 can also adopt the shape of a seat post having the same three-curvature cross section, that is, The seat post 1 also includes the seat tube function, wherein the frame 5 further includes an upper tube 51, a lower tube 53, a head tube 54, a rear upper fork 57, a rear lower fork 59, and the upper tube 51 and the An end of the lower tube 53 facing the front side of the bicycle is coupled to the head tube 54. The rear upper fork 57 is coupled to one end of the rear lower fork 59 at one end of the bicycle rear side, and the other end of the seat rod 1 is coupled to the lower tube respectively. The other end of the 53 and the other end of the rear lower fork 59 are connected to the other end of the rear upper fork 57 and the other end of the upper tube 51, respectively.

Referring to FIG. 5 and FIG. 6 , an embodiment of the present invention, wherein the bicycle seat bar of the three-curvature section comprises: a first pole wall 11 having a first radius of curvature R1 The arc length is less than π R ₁ , the first rod wall 11 is disposed toward the front end of a bicycle; and the second rod wall 13 has a second radius of curvature R2, the second radius of curvature R2 is greater than the first radius of curvature R1, the second rod wall 13 is disposed in a direction toward the rear end of the bicycle; and a third radius of curvature R3 is connected to the first portion by the two end portions of the second rod wall 13 The third radius of curvature R3<the first radius of curvature R1 is defined by the two ends of the rod wall 11; wherein the seat post 1 is further combined with a spacer 15, the frame 5 further includes an upper tube 51 and a lower tube 53. a head tube 54, a tube 55, a rear upper fork 57, and a rear lower fork 59. The upper tube 51 and the lower tube 53 are connected to the head tube 54 at one end toward the front side of the bicycle, and the rear upper fork 57 is behind the bicycle. One end of the side direction is coupled to one end of the rear lower fork 59. The seat tube 55 is a circular middle tube, and the free end of the seat tube 55 has an upward end. a circular opening 550, the other end of the seat post 1 is disposed inside the seat tube 55 by the circular opening 550, and the spacer 15 is backed on the rear side of the seat post 1 and the inside of the seat tube 55. The lower end of the lower end of the seat tube 55 is coupled to the other end of the lower tube 53 and the other end of the lower fork 59. The upward side of the seat tube 55 is coupled to the other end of the rear upper fork 57 and The other end of the upper tube 51.

The space between the seatpost and the seat tube (with respect to the arc portion of the second radius of curvature R2) is supported by a shim to improve stability and safety during riding.

Referring to FIG. 7 , in an embodiment of the present invention, the seat post 1 can change the shape of the seat tube without using a spacer, so that the cross-section of the seat tube is matched with the three-curvature design of the seat post 1 , and the bicycle with the three-curvature cross section is designed. The seat post includes: a first rod wall 11 having a first radius of curvature R1 having an arc length less than πR1, the first rod wall 11 being disposed toward a front end of a bicycle; a second rod wall 13 having a second radius of curvature R2, the second radius of curvature R2 being greater than the first radius of curvature R1, the second rod wall 13 being disposed in a direction toward the rear end of the bicycle; The third radius of curvature R3 is defined by the two ends of the second rod wall 13 being respectively connected to the two end portions of the first rod wall 11, the third radius of curvature R3 < the first radius of curvature R1; wherein The frame 5 further includes an upper tube 51, a lower tube 53, a head tube 54, a tube 55, a rear upper fork 57, and a rear lower fork 59. The upper tube 51 and the lower tube 53 face the front end and the head of the bicycle. The tube 54 is coupled, and one end of the rear upper fork 57 toward the rear side of the bicycle is coupled to one end of the rear lower fork 59. Shape and The seat rod 1 has the same three-curvature cross-section. The inner diameter of the seat tube 55 is slightly larger than the outer diameter of the seat rod 1. The upward end of the seat tube 55 has a three-curvature section opening 551. The lower end is inserted into the inner side of the seat tube 55 by the three-curvature section opening 551, and the seat rod 1 and the seat tube 55 form a tight-fit combination, and the lower end of the seat tube 55 is coupled to the bottom side respectively. The other end of the lower tube 53 and the other end of the rear lower fork 59 are connected to the other end of the rear upper fork 57 and the other end of the upper tube 51, respectively.

The above embodiments of the present invention are provided for convenience of explanation. When the meaning of the case cannot be limited, that is, various transformation designs according to the scope of the listed patent application, for example, the design of different frame shapes, etc., should be included. In the scope of the patent in this case.

1‧‧‧ seatpost (Seat Post)

11‧‧‧First pole wall

13‧‧‧Second wall

R1‧‧‧first radius of curvature

R2‧‧‧second radius of curvature

R3‧‧‧ third radius of curvature

IM‧‧‧ Forward bending moment of inertia

Distance between D‧‧‧R1 and R2 arcs

Claims (17)

A comfortable seatpost for a bicycle with a high deflection and a three-curvature section includes: a first pole wall having a first radius of curvature (R1) having an arc length less than ( π R1 ), the first pole wall Is disposed in a direction toward a front end of a bicycle; a second pole wall having a second radius of curvature (R2), the second radius of curvature (R2) being greater than the first radius of curvature (R1), the second The rod wall is disposed in a direction toward the rear end of the bicycle; a third radius of curvature (R3) is defined by connecting the two end portions of the second rod wall to the two end portions of the first rod wall, respectively. The radius of three curvature (R3) < the first radius of curvature (R1). A comfortable seatpost for a bicycle having a high-deflection three-curvature section according to claim 1, wherein a first radius of curvature (R1) of the first pole wall and a second radius of curvature of the second pole wall (R2) The distance between the arcs is the (D) value, which is used to match the comfort adjustable parameter, which can be adjusted by the arc length of the third radius of curvature (R3), the third radius of curvature ( R3) The arc length adjustment tends to be small, the (D) value also becomes smaller, the moment of inertia becomes smaller, and the seat post becomes softer; on the contrary, the arc length of the third radius of curvature (R3) is adjusted to be larger, (D The value also becomes larger, the moment of inertia becomes larger, and the seat post becomes stiffer. A comfortable seatpost for a bicycle having a high-deflection three-curvature section as described in claim 2, wherein the (D) value is 25 ± 5 mm. A comfortable seatpost for a bicycle having a high-deflection three-curvature section as described in claim 3, wherein the (D) value is preferably 25 ± 3 mm. A comfortable seatpost for a bicycle having a high-deflection three-curvature section as described in claim 4, wherein the (D) value is preferably 25 mm. The bicycle seat comfortable seat of the high-definition three-curvature section according to the first aspect of the patent application, wherein the seat post further comprises a bicycle, the bicycle comprises a pad and a frame, and the upper end of the seat bar is combined. The seat cushion, the other end of the seat post is coupled to the frame. The bicycle seat frame of the high-definition three-curvature section of claim 6, wherein the frame comprises a tube, and the other end of the seat rod is coupled to the seat tube, and the seat tube is also The shape of the seat post is the same as the cross section of the three curvatures, that is, the seat rod also includes the function of the seat tube, wherein the frame further comprises an upper tube, a lower tube, a tube, a rear fork, and a lower back a fork, the upper tube and the lower tube are coupled to the head tube at one end of the front side of the bicycle, the rear fork is coupled to one end of the rear lower fork at one end of the bicycle rear side direction, and the other end of the seat rod is coupled to the lower end The other end of the tube and the other end of the lower fork are connected to the other end of the rear upper fork and the other end of the upper tube respectively. A comfortable seatpost for a bicycle having a high-definition three-curvature section includes: a first pole wall having a first radius of curvature (R1) having an arc length less than (πR1), the first pole wall system Provided in a front end direction of a bicycle; a second pole wall having a second radius of curvature (R2), the second radius of curvature (R2) being greater than the first radius of curvature (R1), the second pole The wall is disposed in a direction toward the rear end of the bicycle; a third radius of curvature (R3) is connected to the two ends of the second rod wall to The first radius of the first rod wall is defined by the third radius of curvature (R3) <the first radius of curvature (R1); wherein the seat post is further combined with a bicycle, the bicycle comprises a pad and a frame. The upper end of the seat rod is coupled to the seat cushion, and the other end of the seat rod is coupled to the frame. The frame further includes an upper tube, a lower tube, a tube, a tube, a rear fork, and a lower portion. a fork, the upper tube and the lower tube are coupled to the head tube at an end of the front side of the bicycle, and an end of the rear upper fork toward the rear side of the bicycle is coupled to one end of the lower fork, the seat tube is a circular middle tube The free end of the seat tube has a circular opening, and the seat rod is further combined with a gasket, and the other end of the seat rod is disposed through the circular opening inside the seat tube, the back of the seat Lining between the rear side of the seat post and the inner side of the seat tube, the lower end sides of the seat tube are respectively coupled to the other end of the lower tube, and the other end of the lower fork, the upward side of the seat tube respectively The other end of the rear upper fork and the other end of the upper tube are joined. A comfortable seatpost for a bicycle having a high-deflection three-curvature section according to claim 8, wherein a first radius of curvature (R1) of the first pole wall and a second radius of curvature of the second pole wall (R2) The distance between the arcs is the (D) value, which is used to match the comfort adjustable parameter, which can be adjusted by the arc length of the third radius of curvature (R3), the third radius of curvature ( R3) The arc length adjustment tends to be small, the (D) value also becomes smaller, the moment of inertia becomes smaller, and the seat post becomes softer; on the contrary, the arc length of the third radius of curvature (R3) is adjusted to be larger, (D The value also becomes larger, the moment of inertia becomes larger, and the seat post becomes stiffer. A comfortable seatpost for a bicycle having a high-deflection three-curvature section as described in claim 9 wherein the (D) value is 25 ± 5 mm. A comfortable seatpost for a bicycle having a high-deflection three-curvature section as described in claim 10, wherein the (D) value is preferably 25 ± 3 mm. A comfortable seatpost for a bicycle having a high-deflection three-curvature section as described in claim 11 wherein the (D) value is preferably 25 mm. A comfortable seatpost for a bicycle with a high deflection and three curvature section includes: a first pole wall having an arc length of a first radius of curvature (R1) less than ( π R1), the first pole wall Is disposed in a direction toward a front end of a bicycle; a second pole wall having a second radius of curvature (R2), the second radius of curvature (R2) being greater than the first radius of curvature (R1), the second The rod wall is disposed in a direction toward the rear end of the bicycle; a third radius of curvature (R3) is defined by connecting the two end portions of the second rod wall to the two end portions of the first rod wall, respectively. a radius of curvature (R3) < a first radius of curvature (R1); wherein the seatpost is further combined with a bicycle, the bicycle comprises a pad, a frame, and an upward end of the seatpost is coupled to the seat cushion, the seatpost The other end of the lower side is combined with the frame, the frame further comprises an upper tube, a lower tube, a tube, a tube, a rear fork, a rear fork, and the upper tube and the lower tube are directed to the front side of the bicycle Combined with one end of the head tube, one end of the rear upper fork toward the rear side of the bicycle is coupled with one end of the rear lower fork, the seat tube The cross-sectional shape is the same as the three-curvature section of the seat post, the inner diameter of the seat tube is slightly larger than the outer diameter of the seat post, and the upward end of the seat tube has a three-curvature section opening, and the lower end of the seat rod The three-curvature section opening is bored to the inner side of the seat tube, and the seat post and the seat tube form a tight fit, and the lower end of the seat tube is coupled to the other end of the lower tube and the lower side respectively At the other end of the fork, the upward side of the seat tube is coupled to the other end of the rear upper fork and the other end of the upper tube, respectively. A comfortable seatpost for a bicycle having a high-deflection three-curvature section according to claim 13, wherein a first radius of curvature (R1) of the first pole wall and a second radius of curvature of the second pole wall (R2) The distance between the arcs is the (D) value, which is used to match the comfort adjustable parameter, which can be adjusted by the arc length of the third radius of curvature (R3), the third radius of curvature ( R3) The arc length adjustment tends to be small, the (D) value also becomes smaller, the moment of inertia becomes smaller, and the seat post becomes softer; on the contrary, the arc length of the third radius of curvature (R3) is adjusted to be larger, (D The value also becomes larger, the moment of inertia becomes larger, and the seat post becomes stiffer. A comfortable seatpost for a bicycle having a high-deflection three-curvature section as described in claim 14 wherein the (D) value is 25 ± 5 mm. A comfortable seatpost for a bicycle having a high-deflection three-curvature section as described in claim 15 wherein the (D) value is preferably 25 ± 3 mm. A comfortable seatpost for a bicycle having a high-deflection three-curvature section as described in claim 16 wherein the (D) value is preferably 25 mm.