Transformable bicycle

Abstract

The present invention proposes a transformable bicycle which has a basket frame configured to be foldable from a main frame so that the bicycle can be used for general purposes such as riding on a road, and moreover, when folded, the bicycle can be transformed into a cart for transporting items and in which the items can be loaded. Thus, in addition to the bicycle being used as a means for stable riding, the bicycle can be transformed into a foldable cart to be used as a cart in marketplaces, supermarkets, and department stores. In addition, because there are a plurality of front wheels, when the bicycle is transformed and used as the cart for transporting items, the items can be safely loaded and transported in the basket. Thus, the stable bicycle form can be used like when the bicycle is ridden on the road, and the transformable bicycle can be used as a cart in marketplaces, supermarkets, and department stores, and may be also used as a stroller for kids.

Description

Transformer bicycle

[0001] The present invention relates to a transformable bicycle, and more particularly, to a transformable bicycle configured by arranging a plurality of front wheels for use by transforming the bicycle into a cart for transporting goods, and wherein the plurality of front wheels can easily change the driving direction by simultaneously tilting in accordance with the operation of the handle.

[0002]

[0003] Typically, department stores and large discount stores sell a wide variety of daily necessities in bulk at discounted prices, and many people purchase various daily necessities in bulk.

[0004] When shopping at large discount stores, customer carts are used to temporarily store selected items and transport them to the checkout counter or parking lot.

[0005] In other words, although the above-mentioned carts are used as tools that consumers themselves push around to find and load the items they wish to purchase, most carts were operated separately for store use, and were generally only usable within the store (mart or department store) and only to the parking lot. In other words, shopping carts were mainly used only while moving items from the store to the car, and general small carts that were not for store use were generally not used frequently due to the inconvenience of carrying empty carts.

[0006] Meanwhile, bicycles are a prime alternative to cars for conveniently transporting shopping items. Bicycles manufactured for this purpose typically feature a front basket or a rear rack.

[0007] However, the structure of a bicycle for transporting goods has limitations in implementing the function of a cart that can carry a lot of goods, so there is an urgent need for transportation equipment that can simultaneously satisfy the functions of a cart and a bicycle.

[0008]

[0009] The purpose of the present invention is to provide a modified bicycle that can be used as a cart for transporting goods by arranging multiple front wheels, thereby enabling the transport of goods safely loaded in a basket.

[0010] Another object of the present invention is to provide a modified bicycle that can maintain the shape of a stable bicycle so that it can be used as a cart in a market or a mart or department store as well as when riding a bicycle on a road, and can even function as a stroller for infants.

[0011] Another object of the present invention is to provide a modified bicycle in which auxiliary wheels are installed on each side of the rear wheel, and when the bicycle is transformed into a cart, the auxiliary wheels are in contact with the ground so that the cart can be driven.

[0012]

[0013] In order to achieve the above-described objects, the present invention relates to a transformable bicycle that can be folded and transformed into a cart, comprising: a main frame having a saddle installed on the upper surface; a rear wheel connected to the lower rear of the main frame by an axle pin; a basket frame located on the front of the main frame and supporting a basket capable of storing items; a top tube having a front end connected to the upper portion of the basket frame and an end connected to the main frame, such that the top tube folds around the pin and connects the basket frame to the main frame; a down tube having a front end connected to the lower portion of the basket frame and an end connected to the main frame, such that the top end folds around the pin and connects the basket frame to the main frame; a head tube inserted into the basket frame and having a handle portion installed at the front end; a head tube support member that is bolted while being fitted to the lower end of the basket frame and has a hole formed in the center through which the lower end of the head tube passes; a direction adjustment connecting plate disposed below the head tube support member; and a direction adjustment connecting plate disposed at the lower center of the direction adjustment connecting plate. The invention is characterized by comprising: a center direction adjustment key having a square hole formed on one side for engaging a square bolt installed at the bottom of the head tube and a protruding pin formed on the other side thereof to be fitted into the direction adjustment connecting plate; a plurality of side direction adjustment keys each disposed on both sides of the lower end of the direction adjustment connecting plate, each having a square hole formed on one side thereof and a protruding pin formed on the other side thereof to be fitted into both sides of the direction adjustment connecting plate; a pair of forks having square bolts fitted into the square holes of the side direction adjustment keys and tilting by rotation of the head tube; and a pair of front wheels each fitted to the forks and connected by an axle pin to change the driving direction of the bicycle by the tilting operation of the forks.

[0014] A modified bicycle according to the present invention is preferably configured with a pair of handle brackets that are pin-attached to the front end of a head tube and rotate horizontally around the pin and perform a vertical rotational motion forward and backward around the pin, a handle fixing part that is fixedly installed to the basket frame while surrounding the front end of the head tube, and a handle fixing protrusion that is protruded from the upper end of one side of the handle fixing part and is fitted into a space between the handle brackets that perform a vertical rotational motion backward around the pin and restricts a horizontal rotation of the handle bracket.

[0015] It is preferable that auxiliary legs are formed extending on both sides at the rear of the main frame of the modified bicycle according to the present invention, auxiliary wheel brackets are rotatably connected to the auxiliary legs using hinge pins, and auxiliary wheels are each inserted into the auxiliary wheel brackets and connected using axle pins.

[0016] A modified bicycle according to the present invention is preferably configured to include a saddle support frame that supports the lower part of a saddle, a cylindrical frame that is installed at the lower part of the saddle support frame and inserted into the upper part of the main frame and has a rotation hole formed through the center thereof so as to be rotatably coupled to the main frame with an axle pin, a lever support groove that is recessed into the outer surface of the cylindrical frame, a lever that is pin-coupled to the upper part of the main frame, and an eccentric projection that is protruded at the tip of the lever and is caught in a state inserted into the lever support groove by the rotational motion of the lever and restricts the rotation of the cylindrical frame.

[0017]

[0018] The present invention is configured to have a basket frame that can be folded from a main frame, so that a bicycle can be used for general road riding purposes, and when folded, it can be transformed into a cart for carrying goods, so that it can carry goods, and it has the effect of being able to be used as a substitute for a cart in a market, mart, department store, etc. by being transformed into a foldable cart, as well as for stable driving.

[0019] Furthermore, when using the bicycle as a cart for carrying goods by arranging multiple front wheels, the basket can be safely loaded and transported, maintaining the stability of the bicycle for use as a cart in places like markets or department stores, just as it does on the road. This also allows the bicycle to function as a stroller for infants.

[0020]

[0021] Figure 1 is a three-dimensional drawing showing the overall configuration of a modified bicycle according to a preferred embodiment of the present invention.

[0022] Figure 2 is an exploded three-dimensional view of Figure 1.

[0023] Figure 3 is a front view of Figure 1.

[0024] Figure 4 is a plan view of Figure 3.

[0025] Fig. 5 is a three-dimensional drawing showing the connection structure between the fork, head tube support, and side adjustment plate in Fig. 4.

[0026] Fig. 6 is a drawing showing a state in which the driving direction of the front wheel is changed according to the operation of the handle part in Fig. 4.

[0027] Fig. 7 is a plan view of the joint structure of the direction adjustment connecting plate for changing the driving direction, the center direction adjustment plate, and the side direction adjustment plate in Fig. 6.

[0028] Figure 8 is a three-dimensional drawing showing an excerpt of the connection structure between the saddle and the main frame.

[0029] Figure 9 is a drawing sequentially illustrating the folding and unfolding process of the saddle in Figure 8.

[0030] Figures 10 to 13 are drawings illustrating a process of folding a bicycle to transform the bicycle of the present invention into a cart.

[0031] Fig. 14 is a drawing illustrating the joint structure of the handle part and the head tube in Fig. 2.

[0032] Fig. 15 is a drawing showing an operating state for using the handle part of Fig. 14 as a cart handle by rotating it backward.

[0033] Fig. 16 is a drawing showing the state in which the training wheels touch the ground when the bicycle is transformed into a cart as in Fig. 13.

[0034] Fig. 17 is a back view of Fig. 16.

[0035]

[0036] The best embodiment for implementing the modified bicycle proposed in the present invention comprises a main frame (100) having a saddle installed on the upper surface, a rear wheel (150) connected to the lower rear of the main frame (100) with an axle pin, a basket frame (20) located at the front of the main frame (100) and supporting a basket (10) capable of storing objects, a top tube (80) having a top end connected to the upper part of the basket frame (20) with a pin (27) and the end connected to the main frame (100) with a pin (83) so as to fold around the pin (83) and connect the basket frame (20) to the main frame (100), and a top tube (80) having a top end connected to the lower part of the basket frame (20) with a pin (26) and the end connected to the main frame (100) with a pin (93) so as to fold around the pin (93) and connect the basket frame (20) to the main frame (100). A down tube (90) connected to the main frame (100), a head tube (40) inserted into the basket frame (20) and having a handle portion (39) installed at the front end, a head tube support (50) that is bolted while being fitted to the lower end of the basket frame (20) and has a hole (53) formed in the center through which the lower end of the head tube (40) passes, a direction adjustment connecting plate (51A) arranged below the head tube support (50), a center direction adjustment key (54a) arranged at the lower center of the direction adjustment connecting plate (51A) and having a square hole (55a) formed on one side for coupling a square bolt (43) installed at the lower end of the head tube (40) and having a protruding pin (56a) fitted into the direction adjustment connecting plate (51A) protruding on the other side, and a center direction adjustment key (54a) arranged on both sides of the lower end of the direction adjustment connecting plate (51A) and having one side A pair of side direction adjustment keys (54) having a square hole (55) formed therein and a plurality of protruding pins (56) protrudingly formed on the other side to be fitted into both sides of the direction adjustment connecting plate (51A), and a pair of forks (60) having a square bolt (61) fitted into the square hole (55) of the side direction adjustment keys (54) and tilting by rotation of the head tube (40),A pair of front wheels (70) are connected by an axle pin (63) while each is fitted into the fork (60) and change the driving direction of the bicycle by the tilting motion of the fork (60).

[0037]

[0038] Hereinafter, embodiments of the present invention will be described with reference to the attached drawings. In the detailed description that follows, two embodiments of the present invention will be presented as representative examples to achieve the aforementioned technical objectives. Furthermore, other embodiments that may be presented according to the present invention will be described in the context of the present invention.

[0039] FIG. 1 is a three-dimensional view showing the entire configuration of a modified bicycle according to a preferred embodiment of the present invention, FIG. 2 is an exploded three-dimensional view of FIG. 1, FIG. 3 is a front view of FIG. 1, FIG. 4 is a plan view of FIG. 3, FIG. 5 is a three-dimensional view showing the connection structure between the fork and the head tube support and the side adjustment plate in FIG. 4, FIG. 6 is a view showing a state in which the driving direction of the front wheel is changed according to the operation of the handle part in FIG. 4, FIG. 7 is a plan view showing the connection structure of the direction adjustment connecting plate, the center direction adjustment plate and the side direction adjustment plate for changing the driving direction in FIG. 6, FIG. 8 is a three-dimensional view showing an excerpt of the connection structure between the saddle part and the main frame, FIG. 9 is a view sequentially showing the folding and unfolding process of the saddle part in FIG. 8, and FIGS. 10 to 13 are views showing the process of folding the bicycle to transform the modified bicycle of the present invention into a cart, and FIG. 14 is a three-dimensional view showing the connection structure of the handle part in FIG. 2. and a drawing illustrating the joint structure of the head tube, FIG. 15 is a drawing illustrating an operating state for using the handle part of FIG. 14 as a cart handle by rotating it backwards, FIG. 16 is a drawing illustrating a state in which the training wheel touches the ground when the bicycle is transformed into a cart as in FIG. 13, and FIG. 17 is a rear view of FIG. 16.

[0040] As illustrated in FIGS. 1 to 17, the modified bicycle may include a main frame (100), a basket frame (20), a handle portion (39), a head tube (40), a head tube support (50), a fork (60), a saddle portion (128), a front wheel (70), a rear wheel (150), and an auxiliary wheel portion (140).

[0041] The main frame (100) is a frame that constitutes the skeleton of a modified bicycle. A saddle (128) is installed on the top of the main frame (100), and a basket frame (20), a head tube (40), a handle (39), a basket (10), and a pair of front wheels (70) are installed on the front, and a rear wheel (150) and a pair of auxiliary wheels (140) are installed on the rear.

[0042] The above basket frame (20) is a frame that supports the basket (10) to the main frame (100). The hole (11) formed inside the basket (10) and the hole (21) formed on the outer wall of the basket frame (20) are connected to each other and are fastened with bolts and nuts to fix the basket (10) to the basket frame (20).

[0043] A handle fixing part (30) is fixedly installed on the upper part of the basket frame (20) so as to surround the head tube (40), and a pair of handle brackets (39a, 39b) constituting a handle part (39) are connected to a pin (38) at the front end of the head tube (40) inserted into the interior of the basket frame (20). The handle brackets (39a, 39b) rotate horizontally left and right about the pin (38) to change the driving direction of the head tube (40), and also rotate vertically forward and backward about the pin (38) to restrain the head tube (40) from rotating.

[0044] As shown in FIG. 14, a handle fixing projection (32) is formed protrudingly on one upper side of the handle fixing portion (30), and the handle fixing projection (32) is inserted into the space (39c) between the handle brackets (39a, 39b) when the handle brackets (39a, 39b) rotate around the pin (38), and in this state, the handle brackets (39a, 39b) are caught on the handle fixing projection (32) and cannot be rotated horizontally for changing direction, so that when transformed into a cart, the user can use the handle portion (39) in a fixed state like the handle of a general cart.

[0045]

[0046] The lower part of the above basket frame (20) (see FIGS. 2 and 4 to 7) is fastened with bolts and nuts while the head tube support (50) is fitted. A hole (53) is formed on the upper surface of the central portion of the above head tube support (50) for assembling the lower part of the head tube (40) which is inserted into the basket frame (20) and connected to the handle bracket (39a, 39b) with a pin (38).

[0047] A hole is drilled in the upper part of the head tube (40), and the hole is inserted so that the upper part of the head tube (40) is positioned inside the handle fixing part (30), and a pin (38) is inserted into the handle bracket (39a, 39b) of the handle part (39) to connect the handle bracket (39a, 39b) to the upper part of the head tube (40), so that the head tube (40) can rotate horizontally left and right in accordance with the change in direction of the handle part (39) and change the driving direction of the front wheel (70).

[0048] A plurality of forks (60) are installed on both sides of the lower portion of the head tube support (50). A square bolt (61) is formed to protrude from the upper portion of the fork (60), and the square bolt (61) passes through the square holes (52) on both sides of the head tube support (50) and is then fastened to the square holes (56) of the side direction adjustment key (54). The front wheel (70) is fitted onto the fork (60) and is connected to it by an axle pin (63).

[0049] That is, the bicycle of the present invention is characterized by being capable of being transformed into a cart. At this time, when transformed into a cart, if the front wheel (70) is one like a conventional general bicycle, there is a risk of falling over or tilting to one side during the process of loading a load. On the other hand, the present invention is characterized by arranging a plurality of front wheels (70) with the same structure so that the load can be loaded stably when transformed into a cart. At this time, when arranging a pair of front wheels (70), the plurality of front wheels (70) must simultaneously turn in the same direction according to the operation of the handle portion (39). To this end, the head tube support (50) is equipped with a configuration such as a side direction adjustment key (54), a center direction adjustment key (54a), and a direction adjustment connecting plate (51A).

[0050] The above direction adjustment connecting plate (51A) is installed on the lower surface of the head tube support (50), and a hole (51) for connecting the head tube support (50) and the head tube (40) is formed through the center of the direction adjustment connecting plate (51A), and also, on both sides of the direction adjustment connecting plate (51A), a hole (51b) is formed through the center for fastening a nut with a protruding pin (56) formed protruding from one end of a side direction adjustment key (54) fitted therein.

[0051] The above direction adjustment key is a means for connecting the fork and head tube support to the direction adjustment connecting plate. The above direction adjustment key is divided into a center direction adjustment key and a side direction adjustment key.

[0052] The center direction adjustment key (54a) is positioned at the bottom center of the direction adjustment frame (51A), and a square hole (55a) is formed on one side to allow a square bolt (43) installed at the bottom of the head tube (40) to be coupled thereto, and a protruding pin (56a) is formed protruding on the other side to be fitted into the hole (51) formed at the center of the direction adjustment frame (51A).

[0053] The side direction adjustment keys (54) are positioned on both sides of the lower side of the direction adjustment frame (51A), and a square hole (55) is formed on one side thereof, and a protruding pin (56) that is fitted into both sides of the direction adjustment frame (51A) is formed protruding on the other side thereof. A square bolt (61) of a fork (60) is fitted into the square hole (55) of the side direction adjustment keys (54).

[0054] When the head tube (40) is rotated by operating the handle part (39) through the direction adjustment connecting plate (51A) and the center direction adjustment key (54a) and the side direction adjustment key (54), the center direction adjustment key (54a) located in the center rotates in the direction of rotation, and at the same time, the direction adjustment connecting plate (51A) connecting the center direction adjustment key (54a) and the side direction adjustment key (54) to each other is pushed to the left or right by the operation of the center direction adjustment key (54a) and the side direction adjustment key (54). At this time, the side direction adjustment keys (54) on both sides tilt due to the operation of the direction adjustment connecting plate (51A), and the plurality of forks (60) are tilted to rotate the front wheel (70) in the direction of rotation of the head tube (40), thereby changing the driving direction at the same time.

[0055]

[0056] Next, the connection structure of the saddle (128) and the main frame (100) is described below.

[0057] As shown in FIGS. 8 and 9, a saddle support member (121) that tiltably supports a saddle member (128) is rotatably inserted into the center of the main frame (100).

[0058] The above saddle support part (121) is composed of a saddle support frame (121a) into which a saddle frame (127) provided at the lower end of the saddle part (128) is inserted, and a cylindrical frame (121b) provided at the lower end of the saddle support frame (121a).

[0059] A rotation hole (122) is formed through the center of the cylindrical frame (121b), and a hinge (122a) passes through the rotation hole (122). The hinge (122a) is coupled to the main frame (100) and supports the cylindrical frame (121b) so as to be rotatable about the hinge (122a). A lever support groove (124a) is formed recessed in the outer diameter of the cylindrical frame (121b), and a lever catch (124) is formed protrudingly above the lever support groove (124a).

[0060] Between the main frame (100) and the cylindrical frame (121b), a lever (108) is inserted and connected to the main frame (100) by a pivot pin (106). An eccentric projection (107) is provided on one side of the tip of the lever (108), and the eccentric projection (107) rotates eccentrically while the lever (108) rotates in one direction (counterclockwise in the drawing) along the pivot pin (106) and is caught on the lever support groove (124a) to prevent the cylindrical frame (121b) from rotating around the hinge (122a). In addition, when the lever (108) is rotated in the other direction (clockwise in the drawing) along the pivot pin (106), the eccentric projection (107) comes out of the lever support groove (124a), and through this, the cylindrical frame (121b) rotates around the hinge (122a) to fold the saddle (128).

[0061] The above main frame (100) is supported and foldably connected to the basket frame (20) through the top tube (80) and down tube (90).

[0062] Referring to FIG. 2 and FIG. 10 to FIG. 13, the top tube (80) is a frame that connects the upper part of the basket frame (20) to the main frame (100). A receiving groove (81) is formed at the front end of the top tube (80), and the basket frame (20) is fitted into the receiving groove (81) and coupled with a pin (27). In addition, the end of the top tube (80) is fitted into the receiving groove (101a) of the main frame (100) and coupled with a pin (83), thereby connecting the upper part of the basket frame (20) and the main frame (100). At this time, a catch (82) is provided at the end of the top tube (80). The catch (82) is hooked onto the inner wall surface of the receiving groove (101a) of the main frame (100) and restricts the one-way folding motion of the top tube (60).

[0063] The above down tube (90) is a frame that connects the lower part of the basket frame (20) to the main frame (100). A receiving groove (91) is formed at the front end of the down tube (90), and the basket frame (20) is fitted into the receiving groove (91) and connected with a pin (26). In addition, a receiving groove (92) is formed at the end of the single tube (90), and the main frame (100) is fitted into the receiving groove (92) and connected with a pin (93).

[0064] Through the pin connection structure of the above top tube (80) and down tube (90), the bicycle of the present invention can be transformed into a transport cart as needed. That is, when the bicycle is to be folded and transformed into a cart, the safety ring (100b) is released, and then the handle portion (39) and the main frame (100) are lifted up, so that the top tube (80) and the main frame (100) are bent at an angle close to 90° based on the pin (83) connecting the top tube (80) and the main frame (100), and at the same time, the down tube (90) and the main frame (100) are also bent based on the pin (93), and the distance between the front wheel (70) and the rear wheel (150) is narrowed.

[0065] Next, as the above operation continues, as shown in Fig. 13, the top tube (80) and main frame (100) and the down tube (90) and main frame (100) are each bent around the pins (83, 93) and transformed into a completely folded cart. Once the transformation into a cart is complete, the safety hook (100b) is re-hooked to the pins to prevent the front wheel (70) and the rear wheel (150) from unintentionally unfolding during the process of transporting the object due to the gap between them widening.

[0066]

[0067] At the rear of the above main frame (100), a plurality of auxiliary legs (112) are arranged on both sides with a rear wheel mounting groove (110) in between.

[0068] Referring to FIG. 2, FIG. 16 and FIG. 17, a rear wheel (150) is fitted into the rear wheel mounting groove (110) and connected with an axle pin (111), and an auxiliary wheel (140) is mounted on each of the auxiliary legs (112).

[0069] The connection between the auxiliary leg (112) and the auxiliary wheel (140) is made by connecting the auxiliary wheel bracket (131) to the auxiliary leg (112) with a hinge pin (133), and connecting the auxiliary wheel (140) with the auxiliary wheel bracket (131) fitted thereto with an axle pin (135). The auxiliary wheel bracket (131) can rotate around the hinge pin (133), and the auxiliary wheel (140) can rotate around the axle pin (135).

[0070] The above-mentioned training wheels (140) directly contact the ground instead of the rear wheels (150) when the bicycle is transformed into a cart, and guide the cart's direction of travel to be freely changed. That is, when the bicycle is folded and transformed into a cart, the rear wheels do not touch the ground, and only a pair of training wheels (140) directly touch the ground. In this state, when the cart's direction of travel is changed, the training wheel bracket (131) can rotate around the hinge pin (133), so that the cart's direction of travel can be easily controlled. On the other hand, when the bicycle is used as a normal bicycle, only the rear wheels (150) touch the ground, and the training wheels (140) float above the ground and do not affect the direction of travel of the bicycle.

[0071]

[0072] When the bicycle of the present invention configured in this way is to be transformed into a cart, first, the safety ring (100b) is released, and then the handle (39) and the main frame (100) are lifted upwards, so that the top tube (80) and the main frame (90) are folded at an angle close to 90°, starting from the pin (83) connecting the top tube (80) and the main frame (100), and at the same time, the down tube (90) and the main frame (100) also begin to fold starting from the pin (93), and the distance between the front wheel (70) and the rear wheel (150) is narrowed.

[0073] Next, if the above operation continues, as shown in Fig. ?, the top tube (80) and main frame (100) and the down tube (90) and main frame (100) are completely folded based on the pins (83, 93), thereby completing the transformation of the bicycle into a cart. Once the transformation into a cart is completed, the safety hook (100b) is hung on the pin again to lock it so that the distance between the front wheel (70) and the rear wheel (150) does not increase unintentionally during the process of transporting the object.

[0074] And when the transformation into a cart is completed, the auxiliary wheels (140) placed on both sides of the rear wheels (150) come into direct contact with the ground and guide the movement of the cart instead of the rear wheels (150) during the cart's use.

[0075] In addition, when the transformation into a cart is completed, the handle brackets (39a, 39b) of the handle portion (39) are rotated rearward relative to the handle fixing member (30) to be used as handles for driving the cart. At this time, after the handle brackets (39a, 39b) are vertically rotated rearward relative to the handle fixing member (32), no rotational movement should be performed to change the driving direction. To this end, a handle fixing projection (32) provided on the handle fixing member (30) is inserted into the space (39c) between the handle brackets (39a, 39b) so that the handle brackets (39a, 39b) do not rotate but remain in a locked and fixed state. Therefore, the user can transform the bicycle into a cart and then use the handle portion (39) in the fixed state as a handle for the cart. In addition, the bicycle of the present invention is configured by manufacturing a plurality of front wheels (70) and connecting them to the head tube (40), so that when transformed into a cart, it can be operated while stably supporting the load of an object during use.

[0076]

[0077] The modified bicycle according to the present invention can be used not only as a regular bicycle, but can also be converted into a cart for carrying items. Accordingly, the present invention can be used as a cart substitute in traditional markets, large supermarkets, department stores, and other locations. Furthermore, the modified bicycle according to the present invention can be used as a stroller for infants due to its stable operation.

Claims

1. In a transformable bicycle that can be folded and transformed into a cart, A main frame (100) on which a saddle is installed on the upper surface; A rear wheel (150) connected to the rear bottom of the main frame (100) by an axle pin; A basket frame (20) located at the front of the main frame (100) and supporting a basket (10) capable of storing items; A top tube (80) having a tip connected to a pin (27) at the upper part of the above basket frame (20) and an end connected to the main frame (100) with a pin (83), and performing a folding motion centered on the pin (83) and connecting the basket frame (20) to the main frame (100); A down tube (90) having a tip connected to a pin (26) at the lower part of the above basket frame (20) and an end connected to the above main frame (100) with a pin (93), and performing a folding motion centered on the pin (93) and connecting the basket frame (20) to the main frame (100); A head tube (40) inserted into the above basket frame (20) and having a handle portion (39) installed at the tip; A head tube support (50) that is bolted and fitted to the lower end of the basket frame (20) and has a hole (53) formed in the center through which the lower end of the head tube (40) passes; A direction adjustment connecting plate (51A) placed below the above head tube support (50); A center direction adjustment key (54a) is positioned at the lower center of the direction adjustment connecting plate (51A), and has a square hole (55a) formed on one side to allow a square bolt (43) installed at the lower end of the head tube (40) to be coupled thereto, and a protruding pin (56a) that is fitted into the direction adjustment connecting plate (51A) is protruded on the other side thereof; A plurality of side direction adjustment keys (54) are arranged on both sides of the lower side of the direction adjustment connecting plate (51A), each having a square hole (55) formed on one side and a protruding pin (56) formed on the other side to fit into both sides of the direction adjustment connecting plate (51A); A pair of forks (60) having a square bolt (61) that is fitted into a square hole (55) of the side direction adjustment key (54) and tilting by rotation of the head tube (40); A modified bicycle characterized by comprising a pair of front wheels (70) that are connected by an axle pin (63) while each is fitted to the fork (60) and change the driving direction of the bicycle by the tilting motion of the fork (60).

2. In paragraph 1, The above handle part (39) is; A pair of handle brackets (39a, 39b) that are connected to the tip of the head tube (40) via a pin (38) and rotate horizontally around the pin (38) and perform vertical rotation forward and backward around the pin (38); A handle fixing part (30) fixedly installed on the basket frame (20) while surrounding the tip of the head tube (40); A modified bicycle characterized by comprising a handle fixing projection (32) that is formed protrudingly on one upper side of the handle fixing portion (30) and is fitted into a space between the handle brackets (39a, 39b) that rotate vertically backwards around the pin (38) and restricts horizontal rotation of the handle brackets (39a, 39b).

3. In paragraph 1, A modified bicycle characterized in that auxiliary legs (112) are formed extending on both sides at the rear of the main frame (100), auxiliary wheel brackets (131) are rotatably connected to the auxiliary legs (112) with hinge pins (133), and auxiliary wheels (140) are each fitted to the auxiliary wheel brackets (131) and connected with axle pins (135).

4. In paragraph 1, A saddle support frame (121a) that supports the lower part of the above saddle (128); A cylindrical frame (121b) installed at the bottom of the saddle support frame (121a) and inserted into the upper part of the main frame (100), and having a rotation hole formed through the center thereof so as to be rotatably coupled to the main frame (100) with an axis pin (122a); A lever support groove (124a) formed in a recess on the outer surface of the above cylindrical frame (121b); A lever (108) coupled to a pin (106) on the upper part of the main frame (100); A modified bicycle characterized by comprising an eccentric projection (107) formed protrudingly at the tip of the lever (108) and inserted into the lever support groove (124a) and caught by the rotational motion of the lever (108) to restrict the rotation of the cylindrical frame (121b).

Images