Steering device for pushcart

Abstract

The present invention relates to a steering device for a push car. The objective of the present invention is to provide a steering device for a push car that can greatly enhance power transmission and directional changeability, such as by forming an auxiliary steering unit of the push car with a drive pinion and a transfer rack, forming a steering drive transmission unit of the push car with a driven pinion and a transfer traction rod, and then connecting the auxiliary steering unit and the main steering unit via an interconnected power structure using the formed steering drive transmission unit as an organic power transmission medium, and additionally connecting a rear handle to the auxiliary steering unit, thereby enabling the steering power from the rear handle to be fully transmitted to the main steering unit without unnecessary loss. Accordingly, specific means of the present invention for achieving the above objective include: A steering device for a push car comprising a push car body, a main steering unit, an auxiliary steering unit, and a steering drive transmission unit; The above auxiliary steering unit is formed with a configuration including a drive guide rail, a drive rack, and a drive pinion; The above steering drive transmission unit is formed with a configuration including a driven pinion, a drive rod, and a rotational connecting member; The above-mentioned push car body is achieved by forming a configuration in which an operating guide is further combined.

Description

Technology Field

[0001] The present invention relates to a push-type stroller vehicle, also known as a push car, and more specifically, to a steering device for a push car comprising a means for manually changing the driving direction by selectively operating a front handle or a rear handle, such as a main steering unit operated by a riding child and an auxiliary steering unit operated by a guardian, wherein the organic connection structure of the main steering unit and the auxiliary steering unit is improved to enhance power transmission and direction changing power, as well as management efficiency such as maintenance, and additionally, the steering device for a push car whose direction is changed by a guardian is capable of safely maintaining the stationary state of the push car by means of an extendable braking means when stopping or parking. Background Technology

[0003] A "Push Car" refers to a stroller-type vehicle that is pushed around; it signifies a type of combined ride-on toy that allows a child to play while riding on it, and enables a guardian to move it by pushing it while the child is seated inside.

[0004] Looking at the general configuration of such a push car, it has an appearance similar to a regular passenger car and forms front and rear wheels, as well as a front handle and a rear handle. In addition, it forms a main steering unit that changes the driving direction by operating the front handle and an auxiliary steering unit that changes the driving direction of the push car by operating the rear handle.

[0005] In addition, the configuration is formed by further providing a steering drive transmission unit that interconnects the main steering unit and the auxiliary steering unit and transmits power from the auxiliary steering unit, which is operated by the rear handle, to the main steering unit to change the driving direction of the front wheels.

[0006] Accordingly, the push car configured as described above can adjust the driving direction by operating the front handle by the child riding on it, and in addition, when a guardian pushes the car while the child is riding on it, the driving direction of the push car can also be adjusted in combination by operating the rear handle by the guardian.

[0007] Meanwhile, another conventional steering drive transmission unit connecting the main steering unit and the auxiliary steering unit of the above-mentioned push car is formed by combining a steering cable in the form of a wire inserted and received in a protective tube of a predetermined length having flexibility, divided into two left and right sections, and connecting the main steering unit and the auxiliary steering unit by power using a fastening bracket at one end and the other end of each steering cable provided.

[0008] At this time, the steering drive transmission unit connected by the above combination is formed as a pair of symmetrically separated left and right sections so as to smoothly select and transmit the power of the rear steering wheel to the left or right direction of the main steering unit in accordance with the rotational direction of the rear steering wheel, thereby enabling adjustment of the driving direction of the front wheels.

[0009] However, the conventional steering drive transmission unit applied to the aforementioned push car has significant structural problems, as it is formed with a pair of mutually divided symmetrical configurations, requiring excessive installation space and making not only the series of installation tasks but also maintenance tasks very complex and difficult.

[0010] In addition, conventional steering drive transmission units applied to push cars are formed with steering cables made of wires, so the wires are easily tensile deformed during frequent power transmission processes, and due to such tensile deformation of the wires, power from the rear handle to change the driving direction is not smoothly transmitted to the main steering device, and in particular, as the tension of the wires must be adjusted frequently to restore the tension of the tensile deformed wires to their original state, there are problems with use and function, including very poor durability and handling.

[0011] Furthermore, the aforementioned conventional push car is a ride-on toy for children, such as one that performs a driving function, and although it requires a braking means to reduce the speed or stop the push car while driving, it has a significant problem in that it inevitably lacks relative convenience and safety because it does not provide any separate braking means for reducing or stopping the driving of the push car. Prior art literature

[0013] Patent Registration No. 2232404 (Registered on March 33, 2021) Utility Model Registration No. 0253002 (Registered on October 23, 2001) Utility Model Registration No. 0308768 (Registered on March 13, 2003) The problem to be solved

[0014] This invention was devised to solve the various problems of conventional steering devices for push cars.

[0015] The objective of the present invention is to provide a steering device for a push car that can greatly enhance power transmission and directional changeability, such as by forming the auxiliary steering unit of the push car with a drive pinion and a transfer rack, forming the steering drive transmission unit of the push car with a driven pinion and a transfer traction rod, and then connecting the auxiliary steering unit and the main steering unit via an interconnected power structure using the formed steering drive transmission unit as an organic power transmission medium, and additionally connecting a rear handle to the auxiliary steering unit, thereby enabling the steering power from the rear handle to be fully transmitted to the main steering unit without unnecessary loss.

[0016] The objective of the present invention is to provide a steering device for a push car that can greatly improve durability and maintainability by forming a steering drive transmission unit with a driven rack and a transfer traction rod to minimize the occurrence of defects such as tensile deformation when transmitting steering power to a rear handle for turning, and also by making it easy to replace or repair parts when replacement or repair is required due to various causes other than tensile deformation.

[0017] The objective of the present invention is to provide a steering device for a push car that simplifies the combination of power transmission components for changing the driving direction and thereby enables a series of manufacturing operations to be quick and convenient by installing and connecting a steering drive transmission unit as a single configuration in either the left or right direction and allowing the driving direction of the push car to be freely integrated and adjusted to the left and right directions by the forward and backward power transfer action of the steering drive transmission unit connected as a single configuration.

[0018] The objective of the present invention is to provide a steering device for a push car that can greatly increase reliability and safety of use by further forming means for reducing or stopping the speed of the push car while driving, such as an extendable braking unit, thereby making it easier to perform a series of braking control operations for stopping or parking the push car. means of solving the problem

[0020] Accordingly, specific means for a steering device for a push car according to the present invention for achieving the above objective include:

[0021] A push car body including a front handle, a rear handle, and front and rear wheels;

[0022] A main steering unit that transmits driving direction switching power to the front wheels by the rotational operation of the above-mentioned front handle;

[0023] An auxiliary steering unit driven by the rotational operation of the above-mentioned rear handle;

[0024] A steering device for a push car comprising a steering drive transmission unit that connects the main steering unit and the auxiliary steering unit and transmits power from the auxiliary steering unit to the main steering unit;

[0025] The above auxiliary steering unit is formed with a configuration including a drive guide rail provided with an uneven guide groove, a drive rack coupled to the uneven guide groove, and a drive pinion that meshes with the drive rack and transmits rotational power of the rear handle to the drive rack;

[0026] The above steering drive transmission unit is formed with a driven pinion, a drive rod that converts the rotational power of the driven pinion into linear motion, and a rotary connecting member that converts the linear motion of the converted drive rod into left / right translational motion and transmits it to a main steering device;

[0027] The above-mentioned driven pinion further forms a drive connector having a rod guide hole provided on its upper surface, and further forms a rotation guide pin coupled to the rod guide hole at one end of the drive rod, and the rotation connecting member is formed to connect the drive rod and the main steering unit with a link rotation structure;

[0028] The above-mentioned push car body is achieved by further forming an operating guide on one side of the bottom surface. Effects of the invention

[0030] In summary, the steering device for a push car according to the present invention comprises an auxiliary steering unit formed by a driving pinion and a transfer rack, and a steering drive transmission unit formed by a driven rack and a transfer traction rod; furthermore, the auxiliary steering unit and the main steering unit are connected by an interconnected power structure using the formed steering drive transmission unit as an organic power transmission medium, and a rear handle is coupled to the auxiliary steering device. This provides the effect of increasing power transmission and directional changeability, such as enabling steering power from the rear handle to be fully transmitted to the main steering unit without unnecessary loss.

[0031] In addition, the steering device for a push car according to the present invention forms a steering drive transmission unit with a driven rack and a transfer traction rod to minimize the occurrence of defects such as tensile deformation when transmitting steering power by a rear handle, and also enables easy replacement or repair of other parts when replacement or repair is required, thereby providing the effect of improving durability and maintainability.

[0032] In addition, the steering device for a push car according to the present invention is configured such that a steering drive transmission unit is installed and connected as a single unit in either the left or right direction, and the driving direction of the push car can be freely and integrally adjusted to the left and right directions by the single steering drive transmission unit. This simplifies the combination of power transmission components for changing the driving direction and, accordingly, provides the effect of making a series of manufacturing operations quick and convenient.

[0033] Alternatively, the steering device for a push car according to the present invention further comprises an extendable braking unit for reducing the speed of the push car or stopping it while driving, thereby enabling easy braking operation when the push car stops or parks, which provides highly useful expected effects such as increasing reliability and safety in use. Brief explanation of the drawing

[0035] FIG. 1 is a planar configuration diagram of a steering device for a push car according to the present invention. FIG. 2 is a perspective view of the configuration of a steering device for a push car according to the present invention. FIG. 3 is an enlarged perspective view of the key parts of the auxiliary steering unit and steering drive transmission unit applied to the present invention. FIG. 4 is an enlarged perspective view of the main steering unit and steering drive transmission unit applied to the present invention. FIG. 5 is an operating state diagram of a steering device for a push car according to the present invention. FIG. 6 is an exploded perspective view of a key part of an expandable braking device applied to the present invention. FIG. 7 is a cross-sectional view of the combined operating state of the retractable braking device applied to the present invention. FIG. 8 is a plan view of this embodiment of a steering device for a push car according to the present invention. FIG. 9 is an enlarged perspective view of a key part of this embodiment of a steering device for a push car according to the present invention. Specific details for implementing the invention

[0036] Hereinafter, the configuration of a preferred embodiment of a steering device for a push car according to the present invention will be described in detail with reference to the attached drawings.

[0037] Referring to the attached drawings, the schematic configuration of the steering device for a push car according to the present invention is composed of a push car body (1), a main steering unit (2), an auxiliary steering unit (3), a steering drive transmission unit (4), and an extendable braking device (5), as shown in FIG. 1.

[0039] In the present invention, the push car body (1) has an appearance similar to a regular passenger car and is configured to be a play means for a child to ride and play on, and to be moved by a guardian while the child is riding on it.

[0040] The push car body (1) comprises a front handle (11) that allows a riding child to control the driving direction themselves, and a rear handle (12) that allows a guardian to control the driving direction while pushing it. (Unexplained reference numeral 111 in the drawing is a steering drive shaft, and 121 is a drive transmission shaft.)

[0041] In addition, the push car body (1) is formed with a configuration that further includes a pair of left and right front wheels (13) and a pair of left and right rear wheels (14) that are in contact with the ground and roll. Since the push car body (1) is identical in configuration to the external configuration of a general push car, the detailed and specific components of the push car body (1) will be omitted.

[0042] At this time, when applying the above-mentioned push car body (1) to the present invention, as shown in FIG. 1 or FIG. 2, it is preferable to further combine and form an operating guide member (15) in a linear arrangement configuration, such as one or more means for fixing and supporting the drive rod (42) of the steering drive transmission unit (4) described later and guiding it in the forward and backward directions.

[0043] In addition, the left and right pair of rear wheels (14) are preferably connected by a pivot shaft (14) as shown in FIG. 2.

[0045] In the present invention, the main steering unit (2) is a means for receiving rotational power from the aforementioned front handle (11) and selectively switching the driving direction of the front wheel (13) to the left or right direction by the received rotational power.

[0046] It is preferable that the main steering unit (2) forms a direction control piece (21) connected to the steering drive shaft (111) of the front handle (11) as shown in FIG. 2 or FIG. 4, and forms a fixed frame (22) that is fixedly coupled to the bottom surface of the aforementioned push car body (1) and supports the inner surface of the direction control piece (21).

[0047] At this time, the fixed frame (22) further forms an operating space (221-1) that protrudes in a stepped structure in the central part and forms a predetermined space on the protruding lower side, and a mechanism hole (221-2) that penetrates in an arc shape and forms an arc structure on the protruding upper surface, for example, an adjustment comfort guide (221).

[0048] And, the above direction adjustment piece (21) further forms a mechanism guide pin (211) that is coupled to the rotation mechanism hole (221-2) and an insertion locking structure while maintaining a gap in the part supported by the fixed frame (22) as shown in FIG. 4.

[0049] In addition, it is preferable that the main steering unit (2) be formed with a configuration that further includes a driving switching member (23) which is connected to the end portion of the direction control member (21) by a hinge rotation structure and causes the driving direction of the aforementioned front wheel (13) to be switched to the left or right direction by the left / right transfer action resulting from such hinge connection.

[0051] In the present invention, the auxiliary steering unit (3) is a means for receiving rotational power from the rear handle (12) described above, and continuously transmitting the received rotational power of the rear handle (12) to the main steering unit (2) described above through the steering drive transmission unit (4) described later, thereby allowing the driving direction of the front wheel (13) to be selectively switched to the left or right direction.

[0052] It is preferable that the auxiliary steering unit (3) has a rod shape having a predetermined length as shown in FIG. 3 and forms a driving guide rail (31) having an uneven guide groove (311), and a driving rack (32) that is inserted and coupled to the uneven guide groove (311) in a sliding locking structure.

[0053] Additionally, the auxiliary steering unit (3) is preferably formed with a configuration including a drive pinion (33) that engages with the drive rack (32) as shown in FIGS. 1 to 3 and transmits the rotational power of the rear handle (12) to the drive rack (32).

[0055] In the present invention, the steering drive transmission unit (4) is a type of intermediate power medium that connects the aforementioned main steering unit (2) and auxiliary steering unit (3) through a mutual power transmission structure, and transmits the power of the auxiliary steering unit (3) to the main steering unit (2) in such a connected state so that the driving direction of the front wheel (13) can be switched and adjusted to the left or right direction.

[0056] It is preferable that the steering drive transmission unit (4) forms a driven pinion (41) that engages with one side of the drive rack (32) of the aforementioned auxiliary steering unit (3), as illustrated in FIGS. 1 to 3. At this time, the driven pinion (41) further forms a drive connector (411) that has a rod guide hole (H) provided in the form of an elliptical through-hole on the upper surface, such as a protruding configuration that extends horizontally for a predetermined length toward one side direction as illustrated in FIG. 3.

[0057] Additionally, the steering drive transmission unit (4) preferably forms a drive rod (42) that converts the rotational power of the driven pinion (41) into linear motion, as shown in FIGS. 1 to 3. At this time, the drive rod (42) further forms a rotation guide pin (421) that is coupled to the rod guide hole (H) at one end, maintaining a gap, as shown in FIG. 3.

[0058] Additionally, the steering drive transmission unit (4) preferably forms a pivot connecting member (43) that converts the linear motion of the converted drive rod (42), as shown in FIGS. 1 to 3, into left / right transfer motion and transmits it to the main steering unit (2) described above. At this time, the pivot connecting member (43) is formed in a configuration that connects the other end of the drive rod (42) and one end of the main steering unit (2) described above with a link pivot structure, for example, in an articulated configuration as shown in FIG. 4.

[0060] Finally, in the present invention, the retractable braking device (5) is installed in either one direction or the other direction of the means connecting the aforementioned left / right pair of rear wheels (14), such as a pivot shaft (141), and is provided to control the movement of the rear wheels (14) that roll while a guardian pushes the push car body (1) with a child on board, thereby reducing or stopping the speed of the push car body (1).

[0061] It is preferable that such a retractable braking device (5) has a braking pedal (P) provided on one side of the outer diameter and a rotating shaft (141) accommodated in the inner diameter, and has a cylindrical tube shape of a predetermined length as shown in FIG. 6 or FIG. 7, and forms a braking control unit (51) in which rotational action in forward and reverse directions is controlled by the braking pedal (P).

[0062] At this time, the braking control unit (51) is formed with a configuration including a cam-type drive body (511) having a curved uneven surface configuration, such as a wave drive surface (511-1), on one side as shown in FIG. 6, a rotation gap (r) to prevent contact friction with the rotation shaft (14) on the inner diameter surface, and a shaft bearing (B1) that maintains the rotation gap (r) on the other side and guides the rotation shaft (14) received in the inner diameter surface of the braking control unit (51) to rotate freely.

[0064] In addition, the above-described retractable braking device (5) preferably forms a braking installation unit (52) that is fixedly coupled to the lower surface of the aforementioned push car body (1) as shown in FIG. 6 or FIG. 7 and guides the braking control unit (51) to be rotatably coupled.

[0065] At this time, the braking installation unit (52) is provided with a fixing installation member (521) that extends as a split protrusion structure on one outer surface as shown in FIG. 6, a braking contact hole (522) of a circular through-hole structure having an elastic operating groove (522-1) on the inner surface, a coil spring (S) coupled to the elastic operating groove (522-1), and a shaft guide hole (523-1), and a fastening bracket (52-1) having a finishing piece (523) formed on the front surface of the elastic operating groove (522-1) to prevent the coil spring (S) from coming off.

[0066] In addition, the configuration is formed to include an auxiliary bracket (52-2) which is fastened and assembled to the rear surface of the braking contact hole (522) of the fastening bracket (52-1) and further has a pivot bearing (B2) attached to the inner central part.

[0068] In addition, the above-described retractable braking device (5) preferably forms a braking pad unit (53) that performs a retractable transfer action in the left / right direction by the forward / reverse rotational power of the braking control unit (51) as shown in FIG. 6 or FIG. 7.

[0069] At this time, the braking pad unit (53) forms a shaft passage hole (531) that is circularly penetrated on the inner side as shown in FIG. 6, and forms a cam-type driven body (532) that has a curved structure on one side and a surface configuration, such as a wave driven surface (532-1), that contacts the aforementioned wave driven surface (511-1).

[0070] Then, a spring insertion surface (533) is formed on the outer diameter surface of the brake pad unit (53) with a spring catch piece (533-1) provided as shown in FIG. 6, and a friction force transmission surface (534) is formed on the other end surface of the brake pad unit (53) in the form of a protrusion structure, such as serrations or an uneven surface, to increase friction force.

[0071] In addition, the above-described retractable braking device (5) is preferably formed with a circular protruding structure as shown in FIG. 7 in the inner central part of the rear wheel (14) to which the aforementioned pivot shaft (141) is connected, and further includes a wheel braking unit (54) that can receive braking friction force from the aforementioned braking pad unit (53).

[0072] At this time, the wheel braking unit (54) further forms a friction braking surface (541) that is formed of a serration or an uneven surface-shaped protrusion, which is a means for increasing braking friction force by contacting the aforementioned friction force transmission surface (534) on the end surface protruding in a circular structure.

[0074] Accordingly, the mutual coupling installation relationship of the steering device for a push car according to the present invention, which is composed of a series of configurations as described above, is as follows.

[0075] First, the main steering unit (1) is installed in the front center of the bottom of the push car body (1) with the steering drive shaft (111) of the front handle (11) connected by power, and additionally, the auxiliary steering unit (3) is installed in the rear center of the bottom of the push car body (1) with the driving transmission shaft (121) of the rear handle (12) connected by power.

[0076] Next, one of the left and right directions of the bottom surface of the push car body (1) on which the main steering unit (2) and auxiliary steering unit (3) are installed is selected, and one side of the main steering unit (2) and auxiliary steering unit (3) installed thereon is power-connected by a single-configuration steering drive transmission unit (4) as shown in FIG. 1.

[0077] And, by selecting one direction from one side and the other direction of the pivot shaft (141) connecting the left and right rear wheels (14), and installing a retractable braking device (5) in the selected direction as shown in FIG. 1, a steering device for a push car according to the present invention is implemented.

[0078] At this time, in the above-mentioned coupling relationship, the steering drive transmission unit (4) is connected to the other end of the drive rod (42) and the one end of the main steering unit (2) described above by a link structure through a pivot connecting member (43). Accordingly, a power transmission means that changes the direction of the front wheel (13), such as a driving conversion shaft (C) connected to the inner side of the front wheel (13) as shown in the enlarged view of parts A and B of FIG. 1, is connected to the inner side of the pivot connecting member (43) connected by the link structure in a fixed installation structure.

[0080] Meanwhile, the steering device for a push car according to the present invention, which is composed of the aforementioned combined configuration, allows the driving direction of the push car body (1), which can be moved by pushing, to be adjusted more smoothly and easily by operating the rear handle (12) by a guardian, and the interaction function of the combined components is as follows.

[0081] First, when the rear handle (12) is selectively rotated to the left or right direction to change the driving direction of the push car body (1), the rotational power of the rear handle (12) is transmitted to the drive rack (33) engaged with the drive pinion (33), and accordingly, the drive rack (33) moves in the left / right direction along the drive guide rail (31).

[0082] Next, the left / right transfer power of the drive rack (33) is transmitted to the steering drive transmission unit (4) and rotates the driven pinion (41) engaged with the drive rack (33), and the rotational power of the driven pinion (41) is continuously transmitted to the drive rod (411) and causes the drive rod (411) to be moved in a forward / backward linear direction (movement).

[0083] At this time, the drive rod (42) that converts the rotational power of the driven pinion (41) into linear motion is connected to a movable structure with a gap at one end by a rod guide hole (H) and a rotation guide pin (421), and is slidably guided in the forward and backward directions by an operating guide (15) formed in a row arrangement configuration, thereby performing a transfer action in a straight direction without any positional deformation.

[0084] In succession, the drive rod (42) that performs the forward / rear linear movement action transmits forward / rear movement power to the main steering unit (2) by means of a pivot connecting member (43) connected by a link structure, and the forward / rear movement power transmitted from the drive rod (42) is converted into left / right movement power by the direction control piece (21) of the main steering unit (2), and by the left / right movement action of the converted direction control piece (21), the driving direction of the front wheel (12) is changed to the right or left direction, thereby completing the operation of a series of steering devices for a push car.

[0086] In addition, the steering device for a push car according to the present invention can control the driving speed of the push car body (1) by using an extendable braking device (5) when the guardian wants to reduce or stop the driving speed of the push car body (1) while pushing the push car body (1) and the driving (moving) process. The function of the extendable braking device (5) is as follows.

[0087] First, when the braking control unit (51) is rotated in the forward direction using the brake pedal (P), the cam-type drive body (511) having a wave drive surface (511-1) also performs a rotational action.

[0088] Accordingly, the above cam-type drive body (511) pushes the wave driven surface (532-1) of a cam-type driven body (532), which is in contact with the wave driven surface (511-1) in a meshing structure as shown in FIG. 7 by rotational movement, and causes the frictional force transmission surface (534) formed by the braking pad unit (53) to come into contact with the frictional braking surface (541) formed by the wheel braking unit (54), and transmits braking force to the push car body (1) by the frictional action of the frictional force transmission surface (534) and the frictional braking surface (541) that are in contact in this way.

[0089] And, subsequently, when the braking force of the push car body (1) is to be released, if the braking control unit (51) is rotated in the reverse direction using the braking pedal (P), the cam-type drive body (511) having a wave drive surface (511-1) will perform a rotational action opposite to the braking direction.

[0090] Accordingly, the cam-type drive body (511) returns to its original position by reverse rotational movement, and the brake pad unit (53) that is in frictional contact with the friction braking surface (541) of the wheel braking unit (54) also returns to its original position by the elastic action of the coil spring (S).

[0091] And, as described above, when the braking pad unit (53) returns to its original position, the wave driven surface (532-1) formed by the cam-type driven body (532) also comes into contact with the wave driven surface (511-1) formed by the cam-type driven body (511) in its original state, thereby releasing the braking force of the push car body (1). Thus, the steering device for a push car according to the present invention is implemented through this series of functions.

[0093] Alternatively, FIG. 8 is a plan view of another embodiment of a steering device for a push car according to the present invention, and FIG. 9 shows an enlarged perspective view of a key part of another embodiment of a steering device for a push car according to the present invention.

[0094] The present invention as an embodiment completely excludes the drive guide rail (31) and drive rack (32) formed as auxiliary steering unit (3) in the configuration of the aforementioned embodiment, for example, by forming the drive pinion (33) coupled to the drive transmission shaft (121) of the rear handle (12) as a simple single configuration;

[0095] The driving pinion (33) of the auxiliary steering unit (3) formed as a single unit and the driven pinion (41) formed by the steering drive transmission unit (4) can be connected by a gear belt (100) as shown in FIG. 8 or FIG. 9, so that the power of the driving pinion (33) can be directly transmitted to the driven pinion (41). Explanation of the symbols

[0097] 1 : Push car body 2 : Main steering unit 3: Auxiliary steering unit 4: Steering drive transmission unit 5 : Retractable braking system 11 : Front handle 12 : Rear handle 13 : Current 14 : Rear wheel 15 : Operation guide 21 : Direction adjustment part 22 : Fixed frame 31 : Drive guide rail 32 : Drive rack 33 : Driving pinion 41 : Driven pinion 42 : Drive rod 43 : Rotating connecting member 51: Braking control unit 52: Braking installation unit 53 : Brake pad unit 54 : Wheel braking unit

Claims

Claim 1 A push car body (1) comprising a front handle (11) and a rear handle (12) for controlling the driving direction, and a pair of left and right front wheels (13) and rear wheels (14) that are in contact with the ground and roll; a main steering unit (2) that is driven to move in the left / right direction by the rotational operation of the front handle (11) and transmits driving direction switching power to the front wheels (13); and an auxiliary steering unit (3) that is driven to move in the left / right direction by the rotational operation of the rear handle (12); A steering device for a push car comprising a steering drive transmission unit (4) that connects the main steering unit (2) and the auxiliary steering unit (3) by a power transmission structure and transmits the power of the auxiliary steering unit (3) to the main steering unit (2) to change the driving direction of the front wheel (13); wherein the auxiliary steering unit (3) is formed with a configuration including a drive guide rail (31) provided with an uneven guide groove (311), a drive rack (32) coupled to the uneven guide groove (311) by a sliding locking structure, and a drive pinion (33) that engages with the drive rack (32) and transmits the rotational power of the rear handle (12) to the drive rack (32); The above steering drive transmission unit (4) is formed with a driven pinion (41) engaged with one side of the drive rack (32) of the auxiliary steering unit (3), a drive rod (42) that converts the rotational power of the driven pinion (41) into linear motion, and a pivot connecting member (43) that converts the linear motion of the converted drive rod (42) into left / right transfer motion and transmits it to the main steering unit (2); wherein the driven pinion (41) further forms a drive connecting member (411) with a rod guide hole (H) provided on its upper surface as a side extension structure, and the drive rod (42) further forms a pivot guide pin (421) that is coupled to the rod guide hole (H) while maintaining a gap at one end, and the pivot connecting member (43) is formed to connect the other end of the drive rod (42) and one end of the main steering unit (2) with a link pivot structure.A steering device for a push car, characterized in that the above-described push car body (1) further combines and forms one or more operation guide members (15) in a linear arrangement configuration that fixes and supports a drive rod (42) formed by a steering drive transmission unit (4) on one side of the bottom surface and guides it to slide in the forward and backward directions.; Claim 2 In claim 1; the main steering unit (2) is formed with a configuration including a direction adjustment piece (21) connected to the steering drive shaft (111) of the front handle (11), a fixed frame (22) fixedly coupled to the bottom surface of the push car body (1) and supporting one inner surface of the direction adjustment piece (21), and a drive switching piece (23) hingedly coupled to the end of the direction adjustment piece (21) and switching the driving direction of the front wheel (13) by left / right transfer action; The above fixed frame (22) is formed with a step structure protruding from the central part and further forms an adjustment guide (221) having an operating space (221-1) on the protruding lower side and a rotation mechanism hole (221-2) on the protruding upper surface; the above direction adjustment piece (21) is further formed with a mechanism guide pin (211) that maintains a gap in the part supported by the fixed frame (22) and is coupled with the rotation mechanism hole (221-2) by an insertion locking structure, characterized by a steering device for a push car. Claim 3 A steering device for a push car according to claim 1; wherein the steering drive transmission unit (4), which connects the main steering unit (2) and the auxiliary steering unit (3) and transmits the power of the auxiliary steering unit (3) to the main steering unit (2), is formed as a single unit in either the left or right direction of the bottom surface of the push car body (1). Claim 4 A steering device for a push car according to claim 1; wherein the auxiliary steering unit (3) is formed as a single-component driving pinion (33) coupled to the driving transmission shaft (121) of the rear handle (12); and the single-component driving pinion (33) and the driven pinion (41) of the steering drive transmission unit (4) are connected by a gear belt (B) so that the power of the driving pinion (33) is directly transmitted to the driven pinion (41). Claim 5 In claim 1; a pair of rear wheels (14) formed by a push car body (1) are connected by a pivot shaft (141), and a retractable braking device (5) for controlling the rolling of the rear wheels (14) is further installed in either one direction or the other direction of the pivot shaft (141); wherein the retractable braking device (5) comprises: a braking control unit (51) that accommodates the pivot shaft (141) and is controlled to rotate in forward and reverse directions by a braking pedal (P) formed on one side of the outer diameter; and a braking installation unit (52) that is fixed to the lower surface of the push car body (1) and induces and connects the braking control unit (51) in a rotatable structure; A steering device for a push car characterized by being formed with a configuration including a brake pad unit (53) that performs an extension and retraction movement by the forward and reverse rotational power of the brake control unit (51); and a wheel brake unit (54) that is installed in a circular protruding structure in the inner central part of the rear wheel (14) to which the rotation shaft (141) is connected, and receives braking friction force from the brake pad unit (53). Claim 6 In claim 5; the braking control unit (51) is formed as a cylindrical tube comprising a cam-type drive body (511) having a wave drive surface (511-1) provided on one side, a rotation gap (r) that prevents contact friction with the rotation shaft (14) on the inner diameter surface, and a shaft bearing (B1) that maintains the rotation gap (r) on the other side and induces the rotation shaft (14) to rotate freely; The braking installation unit (52) is formed with a configuration including: a fixed installation member (521) extending as a split protrusion structure on one outer surface; a braking contact hole (522) having a circular through-hole structure with an elastic operating groove (522-1) provided on the inner surface; a coil spring (S) coupled to the elastic operating groove (522-1); a fastening bracket (52-1) having a shaft guide hole (523-1) and a finishing piece (523) formed on the front surface of the elastic operating groove (522-1) to prevent the coil spring (S) from detaching; and an auxiliary bracket (52-2) which is fastened and fixed to the rear surface of the braking contact hole (522) of the fastening bracket (52-1) and further has a pivot bearing (B2) coupled to the inner center. A steering device for a push car, characterized in that the braking pad unit (53) is formed with a configuration including a shaft passing hole (531) that is circularly penetrated on the inner side, a cam-type driven body (532) having a wave driven surface (532-1) on one side, a spring insertion surface (533) having a spring catch piece (533-1) on the outer diameter perimeter, and a friction force transmission surface (534) having a protrusion structure on the other end surface; and the wheel braking unit (54) is formed with a configuration including a friction braking surface (541) having a protrusion structure on a circularly protruding end surface.

Images