CN2748364Y - Folding bicycle frame - Google Patents

Abstract

A folding bicycle frame at least comprises an upper tube, a head tube, a seat tube and a rear fork tube, wherein the middle section of the upper tube is provided with a folding mechanism; the upper tube is separated by the folding mechanism to form a front upper tube and a rear upper tube, the folding mechanism is mainly characterized in that two ends of the upper tube are respectively pivoted with the front upper tube and the rear upper tube through a pivoting shaft, the two plates can be ordered by a positioning device to be separated relatively, so that the front upper tube and the rear upper tube can be pivoted and positioned at a use position and a folding position relative to the two plates, and when the front upper tube and the rear upper tube are simultaneously in a folding state, the folding mechanism is integrally U-shaped, and when the two plates are ordered by the positioning device to be relatively close to each other, the upper tube and the lower side of the front upper tube and the lower side of the rear upper tube can be respectively clamped, and the angles of the front upper tube and the rear upper tube are fixed through the positioning device.

Description

foldable bike rack

technical field

The utility model is related to a foldable bicycle frame, and in more detail, mainly refers to a foldable bicycle frame that is convenient to carry and tow.

Background technique

Please refer to FIG. 13 , the frame 70 of a common foldable bicycle mainly includes an upper tube 71 with a folding mechanism 80 in the middle section, a head tube 72 at the front end of the upper tube 71 , and a head tube 72 at the front end of the upper tube 71 . The seat tube 73 at the rear end of the upper tube 71, and the rear upper fork 74 and the rear chain fork 75 which are respectively located at the other side of the seat tube 73 relative to the upper tube 71, wherein the head tube 72 is for pivoting the bicycle front fork (on the figure). not shown), to locate the front wheel and the handlebar, the seat tube 73 is used for inserting the seat post of the bicycle, and the junction of the seat stay 74 and the chain stay 75 is used for a rear wheel hub to set the position, And cooperate components such as chainring and pedal group, pass to form a bicycle that can be ridden.

The folding mechanism 80 of the upper tube 71 includes a main body 81 and a movable piece 82 pivotally connected in two phases, and a quick release assembly 83 for controlling the combination or separation of the main body 81 and the movable piece 82, that is, When the quick release part 83 locks the movable piece 82 on the main body 81, the vehicle frame 70 is formed into a use state (shown in FIG. 13 ); When the main body 81 is released, the user can pivot the front tube portion at the front end of the upper tube 71 to make the frame 70 folded (as shown in FIG. 14 ).

However, although the structure of the folding method of the existing vehicle frame 70 is simple and easy, the structure of the overall vehicle frame 70 after folding is unstable. It is not positioned, so it is easy to shake and increase the load on the pivot joint between the movable piece 82 and the main body 81, causing the vehicle frame 70 to be easily damaged by the folding mechanism 80; moreover, the existing vehicle frame 70 is based on the main body 81 and the pivot point 84 of the movable piece 82 is the axis, so that the upper tube 71 and the rear fork are bent and folded at a predetermined angle, and the folded bicycle front wheel and rear wheel cannot be in a parallel state. As a result, the user cannot move the bicycle in a dragging manner, which often causes troubles in handling and bending storage; also because of this lack, it cannot be used in combination with mass transportation such as MRT, trains or buses, and it still needs to be solved. Improve.

Utility model content

The main purpose of the utility model is to provide a foldable bicycle rack, which can make the bicycle more convenient for the user to move and drag when the bicycle is in the folded state.

The secondary purpose of the present invention is to provide a foldable bicycle rack, the operation of combining or folding is very simple and clear, and the combined state is very stable.

In order to achieve the purpose of exposing, the utility model provides a foldable bicycle frame, which at least includes: an upper tube with a folding mechanism in the middle section, a head tube at the front end of the upper tube, and a head tube at the front end of the upper tube. A seat tube at the rear end of the upper tube, and a rear fork tube located on the other side of the seat tube relative to the upper tube; the upper tube is divided into a front upper tube and a rear upper tube by the folding mechanism, and it is characterized in that the The folding mechanism further includes:

The two plates are arranged parallel to the upper and lower sides of the front upper tube and the rear upper tube. It is a first position that can be relatively close to the shortest distance, or a second position that is relatively separated by the push force;

at least one elastic member is arranged between the two plates, and is used to push the two plates to keep the two plates at the second position; and

A positioning device has at least one shaft passing through the two plates, at least one end of the shaft is pivotally provided with a pivoting member, and when the pivoting member pivots, it can position and fix the second plate in the first position. Location;

When the two plates are fixed at the first position by the positioning device, the front upper tube and the rear upper tube will be positioned by the pressure of the two plates; and when the positioning device is released, the two plates will Being in the second position due to the resistance of the elastic member, the front upper tube and the rear upper tube can respectively pivot between a use position and a folded position.

In addition to the advantages of easy transportation and storage, the utility model is more convenient for users to tow and move in a folded state. For short-distance users who need to take public transportation such as MRT, trains or buses, it is convenient to tow. Favorites will have considerable convenience. The utility model can also prevent the user's feet or clothing from being hooked to the two pivot shafts when the user is riding or moving the bicycle, causing accidental injury.

Description of drawings

Hereinafter, the preferred embodiments of the present utility model are enumerated, and are described in detail in conjunction with the following drawings, wherein:

Fig. 1 is a schematic diagram of a foldable frame applied to a bicycle according to the first preferred embodiment of the present invention;

Fig. 2 is a three-dimensional exploded view of the folding mechanism of the folding frame of the first preferred embodiment of the present invention;

Fig. 3 is a combined sectional view of Fig. 2, and shows the state where the folding mechanism is engaged;

Fig. 4 is the same assembled cross-sectional view of Fig. 3, and shows the state of the folding mechanism not being engaged;

Fig. 5 is a three-dimensional schematic view of the folding mechanism in a bent state according to the first preferred embodiment of the present invention;

Fig. 6 is a schematic diagram of the folding frame of the first preferred embodiment of the utility model when it is applied to a bicycle;

Fig. 7 is a three-dimensional exploded view of the folding mechanism of the folding frame according to the second preferred embodiment of the present invention;

Fig. 8 is a combined sectional view of the folding mechanism of the folding frame of the second preferred embodiment of the present invention;

Fig. 9 is a schematic diagram for continuing the operation of Fig. 8;

Fig. 10 is a three-dimensional exploded view of the folding mechanism of the folding frame according to the third preferred embodiment of the present invention;

Fig. 11 is a cross-sectional view of the folding mechanism of the folding frame according to the third preferred embodiment of the present invention; and

Fig. 12 is a three-dimensional exploded view of a fourth preferred embodiment of the present invention;

Fig. 13 is a schematic diagram of a folding bicycle frame in the prior art;

Fig. 14 is a schematic view of the use state of Fig. 13 .

Detailed ways

Please refer to Fig. 1, which is a schematic diagram of a state of the utility model folding bicycle frame 20 applied to a bicycle. 21 a head tube 22 at the front end, a seat tube 23 located at the rear end of the upper tube 21, and a rear fork tube 24 located at the other side of the seat tube 23 relative to the upper tube 21, wherein the head tube 22 is for pivoting The bicycle front fork 11, the upper and lower ends of the bicycle front fork 11 are respectively positioned with a telescopic handle 12 and a front wheel 13, the top of the seat tube 23 is for inserting the bicycle seatpost 14, and the rear fork The pipe 24 is used for a rear wheel 15 to be pivotally positioned, and cooperates with components such as the chainring 16 and the pedal group 17 to form a bicycle that can be ridden.

Referring to Fig. 2 again, the utility model is characterized in that by setting the folding mechanism 40, the upper tube 21 can be controlled to bend at a predetermined angle, and the upper tube 21 is divided by the folding mechanism 40 And form a front upper tube 211 and a rear upper tube 212, the opposite ends of the front and rear upper tubes 211, 212 are respectively provided with an axis hole 213, 214, and along the upper and lower end surfaces of the axis hole 213, 214, a square hole is provided. Dimples 215, 216, and the folding mechanism 40 then includes:

The two plates 41, 42 are arranged between the front upper tube 211 and the rear upper tube 212 in a parallel up-and-down manner, and each of the two plates 41, 42 has a through hole 411, 421 at the center relative to each other. The dimples 215, 216 of the front upper tube 211 and the rear upper tube 212, the two ends of the two plates 41, 42 are respectively provided with a square protrusion 412, 422 on the inner side relative to the inner surface, for combining with the two dimples 215, 216, And relative to the shaft holes 213, 214 of the front upper tube 211 and the rear upper tube 212, two through holes 413, 423 are respectively formed therethrough.

The two pivot shafts 43 pass through the two perforations 413, 423 of the same side ends of the two plates 41, 42 and the shaft holes 213, 214 of the front upper tube 211 and the rear upper tube 212, and are fixed by a screw 44. Locking and positioning, each rotating shaft 43 and the end of the screw 44 have a flange 431, 441, through which the two plates 41, 42 can move up and down along the two pivot shafts 43, and are used to limit the two plates. The range of displacement of 41,42, that is to say, impels the two plates 41,42 to only move up and down between a first position (as shown in Figure 3) and a second position (as shown in Figure 4), and when the When the two plates 41, 42 are located at the first position at the same time, the dimples 215, 216 are engaged with the projections 412, 422, and when the two plates 41, 42 are located at the second position at the same time At this time, the dimples 215, 216 are separated from the protrusions 412, 422, so that the front upper tube 211 and the rear upper tube 212 can rotate a predetermined angle along the two pivot axes 43 respectively, and use the dimples to The sockets 215, 216 and the protrusions 412, 422 are combined to change the angle so that the upper tube 21 is in a use position or a folded position.

Two elastic parts 45 are respectively embedded between the two plate bodies 41, 42 for two compression springs. On the positioning blocks 414, 424, by avoiding the two elastic parts 45 from jumping off during the process of being pressed by force, secondly, the two elastic parts 45 push the two boards 41, 42 to stretch outwards with their two ends, The two boards 41 and 42 are urged to be respectively located at the second position.

A positioning assembly 46, which includes a pivot member, in this embodiment is a quick release handle 461 with eccentric pressing effect, and a shaft 462 pivotally connected to one end of the quick release handle 461, the shaft rod 462 is the through hole 411, 421 that can pass through the two boards 41, 42, and then lock the end of the shaft 462 with a knob 463. The quick release handle 461 is formed by the principle of eccentric pressing. Make the two plates 41, 42 relatively close, and then make the two plates 41, 42 in the first position; conversely, when the quick release handle 461 is reversely rotated, the two plates 41, 42 can be The pushing of the two elastic members 45 separates relative to each other, and then they are in the second position.

It can be seen from the above structure that when the utility model folding bicycle rack 20 is used on a bicycle, the handle 461 of the positioning assembly 46 can be used to quickly control the displacement of the two plate bodies 41, 42, and then change the front upper tube 211 and The position of the rear upper tube 212 achieves the purpose of the bicycle being folded or in use in a simple and easy-to-operate manner; at the same time, when the front upper tube 211 and the rear upper tube 212 are in the folded position, they will be in contact with the two boards. Between 41 and 42, there is a U-shaped folded state (as shown in Figure 5 and Figure 6 ), and at this moment, the two wheels 13 & 15 of this bicycle are in a state parallel to each other.

Moreover, in order to make the two plates 41, 42 more balanced when stretched and moved by the elastic member 45, the utility model also has to tightly fix the two pivot shafts 43 on the The shaft holes 213, 214 of the front upper tube 211 and the rear upper tube 212, so that when the positioning assembly 46 is in a loose state, the protrusions 412, 422 of the two plates 41, 42 can break away from the recesses 215 , 216, and then make the bending of the front upper tube 211 and the rear upper tube 212 smoother.

In addition, the utility model further forms a chamber 415, 425 with an opening slightly larger than the opening of each of the perforations 413, 423 on the outside of each perforation 413, 423 of the two plate bodies 41, 42 to accommodate the two pivots. The two flanges 431, 441 of the rotating shaft 43 and the screw 44, this design has the function of preventing the two flanges 431, 441 from exceeding the two plates 41, 42, so that when the user rides or moves the bicycle, the user's feet or The clothes will not be hooked to the two pivot shafts 43 to cause accidental injury.

In addition, what is specifically stated here is that the utility model mainly provides another folding state of the folding bicycle in a stable structure and a simple and easy-to-operate manner, and makes the bicycle in the folded state easy to move. Therefore, like the structures of the following embodiments, the same operation mode and effect as the previous embodiments can be achieved. The following embodiments illustrate that those with the same components as the first embodiment still use the existing labels, and those with different structures are assigned New corresponding labels for comparison:

Continue referring to Fig. 7 to Fig. 9, it is the state schematic diagram of this folding mechanism 50 of the second preferred embodiment of the present utility model, and its components are roughly the same as the above embodiment, but, the front upper tube 51 and a rear The dimples 511, 512 of the upper tube 52 are cross-shaped, and the protrusions 531, 541 of the two plates 53, 54 are cross-shaped protrusions that are complementary to the dimples 511, 512. Secondly, the positioning device 55 is directly replaced by a screw rod, one end of which is provided with an external thread 551 and can be screwed to the plate body 42, and the other end is formed as a knob 552; when the bicycle transforms into a folded state, the user Rotating the knob 552 can be used to drive the screw end 551 of the positioning device 55 to continuously screw inward, so that the knob 552 is pressed against the plate body 41, and the two plates 41, 42 are relatively close. Similarly, when the knob 552 When the screw end 551 is driven to rotate outward, the two plate bodies 41 and 42 will be relatively separated due to being pushed by the elastic member 45. The ultimate purpose of the folding mechanism 50 is the same as that of the previous embodiment, here That is not to repeat the description.

See also Fig. 10 and shown in Fig. 11, it is the folding mechanism 60 of the third preferred embodiment of the present invention, in order to make the whole of the folding mechanism 60 more beautiful, the present embodiment is on the front upper tube 61 and The pivotal ends 611, 621 of the rear upper tube 62 are provided with a predetermined number of through holes 612, 622, and a corresponding number of elastic members 63 are accommodated in each through hole, and the elastic members 63 are respectively pierced through the through holes. 612, 622, and the two ends of the elastic member 63 protrude from the upper and lower sides of the front upper tube 61 and the rear upper tube 62, so as to push the two plates 64, 65 outward. That is, by hiding the elastic parts 63 in the pivotal ends 611 , 621 of the front upper tube 61 and the rear upper tube 62 , the aesthetics of the folding mechanism 60 can be improved.

Also, as shown in Figure 12, the folding mechanism 90 of the fourth preferred embodiment of the present invention is characterized in that the positioning device includes two shafts 91, 92, and one of the shafts 91 is pivotally mounted on the two plates Between the two perforations 423 at one end of 41, 42 and the perforation 213 at the pivotal end of the front upper tube 211, the other shaft 92 is pivotally arranged on the other two perforations 423 opposite to the two boards 41, 42 and the rear upper tube 212 pivot. Between the perforations 214 of the connection end 31, through this, the front upper tube 211 and the rear upper tube 212 are pivotally arranged on the two ends of the two plates 41, 42 respectively. In addition, the bottom ends of the two shafts 91, 92 are respectively provided There is a quick release assembly 93, and a knob 94 is provided on the top, so that the structure of this embodiment can also achieve the same effect as the previous embodiment.

It should be explained here that the design of the bumps and dimples of the two plates and the relative front upper tube and rear upper tube of the utility model is mainly used to control the relationship between the two plates and the relative front upper tube and rear upper tube. When the protrusions and dimples are engaged, the plate and the relative front upper tube and rear upper tube cannot produce relative rotation, but it does not limit the shape and number of these protrusions and dimples, and when these When the bump and the dimple are arranged on the pivoting surface of the two plates and the front upper tube and the rear upper tube (not concentric with the pivot axis), it can also achieve the above-mentioned effect; and the number of these elastic components And the setting position is not limited to the above-mentioned embodiment, for example, any latch assembly with relative combination or separation, and the elastic assembly with push against the relative separation of the two plates will be regarded as the equivalent of the present invention. implementation, and are protected by the patent scope of the utility model application.

Claims (12)

1. A foldable bicycle frame, which at least includes: a middle section with a top tube with a folding mechanism, a head tube at the front end of the top tube, a seat tube at the rear end of the top tube, and a The seat tube is opposite to the rear fork tube on the other side of the upper tube; the upper tube is separated by the folding mechanism to form a front upper tube and a rear upper tube, which is characterized in that: The folding mechanism includes: The two plates are arranged parallel to the upper and lower sides of the front upper tube and the rear upper tube. It is a first position that can be relatively close to the shortest distance, or a second position that is relatively separated by the push force; at least one elastic member is arranged between the two plates, and is used to push the two plates to keep the two plates at the second position; and A positioning device has at least one shaft passing through the two plates, at least one end of the shaft is pivotally provided with a pivoting member, and when the pivoting member pivots, it can position and fix the second plate in the first position. Location. 2. The foldable bicycle rack according to claim 1, wherein the two plates are pivotally arranged on the two ends of the front upper tube and the rear upper tube by means of two pivot shafts. , and each of the two ends of the pivot shaft has a flange, and the two flanges are used to limit the displacement of the two boards. 3 . The foldable bicycle rack according to claim 1 , wherein the outer peripheral surface of the shaft of the positioning device is provided with threads, and the pivoting member is a knob fixed on one end of the shaft. 4 . 4. The foldable bicycle rack according to claim 1, wherein the pivoting part of the positioning device is a quick release handle. 5 . The foldable bicycle rack according to claim 4 , wherein a pivoting member is further provided on the shaft of the positioning device opposite to the end of the quick release handle. 5 . 6. The foldable bicycle rack according to claim 5, wherein the pivoting member is a knob. 7. The foldable bicycle rack according to claim 1, characterized in that: the upper and lower sides of the two boards and the pivotal ends of the front upper tube and the rear upper tube are respectively formed with two opposite projections, and The front upper tube and the rear upper tube are recessed with complementary dimples. 8. The foldable bicycle rack according to claim 7, wherein the protrusions of the two plates are square. 9. The foldable bicycle rack according to claim 7, wherein the protrusions of the two boards are cross-shaped. 10. The foldable bicycle rack according to claim 1, wherein the pivotal end of the front upper tube and the pivotal end of the rear upper tube are provided with a plurality of perforations for the elastic parts of the folding mechanism It is provided that the two ends of the elastic member respectively protrude out of the upper and lower sides of the front upper tube and the rear upper tube, and simultaneously abut against the inner sides of the two boards. 11. The foldable bicycle rack according to claim 1, characterized in that: the elastic member is two springs; and the two plate bodies each have a positioning block corresponding to the elastic member for the two The two ends of the spring are clamped. 12. The foldable bicycle rack according to claim 1, wherein the positioning device includes two shafts, and the two plates are pivoted on the front upper tube and the rear upper tube by the two shafts The two upper and lower pivoting end sides of each shaft are respectively pivotally provided with a pivot piece. When each pivot piece pivots, the two plates can be respectively driven to displace along the two shafts, so that the The two plates are relatively close to or relatively separated.

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