Wheel steering mechanism and cart

Abstract

The present invention relates to a wheel steering mechanism (100) for steering a wheel mechanism (400) of a cart (1), the wheel steering mechanism (100) comprising: a linkage member (160) for steering a pair of wheel mechanisms (400) of the cart (1) in a linked manner; a crossbar (150) for connecting two wheel seats (210) of the cart (1), the crossbar (150) being pivotally connected to each of the wheel seats (210) on the crossbar (150); and a holding device (110) disposed between the linkage member (160) and the crossbar (150) for holding the pair of wheel mechanisms (400) so that they can be steered in a linked manner. The present invention further relates to a cart (1) including the wheel steering mechanism.

Description

[Technical Field]

[0001] The present invention relates to the field of carts, and more particularly to a wheel steering mechanism and its unlocking retention assembly that provides wheel drift functionality for carts. [Background technology]

[0002] Currently, carts with drifting functions are available on the market. These carts have front and rear wheels that can rotate in all directions around a nearly vertical axis, allowing the vehicle to travel in any direction. There are few carts with drifting functions on the market, and even those that do exist are relatively small carts, usually with two wheels. If one wheel has a drifting function, the carts are prone to tipping over during use and are not very stable. Applying such a mechanism to a stroller poses a safety risk.

[0003] Therefore, there is a need to provide a steering mechanism suitable for relatively large wheels, which can provide better stability while providing two-wheel drift capability. Summary of the Invention

[0004] According to the present invention, there is provided a wheel steering mechanism for steering the wheel mechanisms of a cart, characterized in that it comprises an interlocking member for steering a pair of wheel mechanisms of the cart in conjunction with one another, a crossbar for connecting two wheel seats of the cart, each of the wheel seats being pivotally connected to a wheel mechanism, and a holding device arranged between the interlocking member and the crossbar for holding the pair of wheel mechanisms so that they can be steered in conjunction with one another.

[0005] According to one embodiment of the present invention, the holding device has a locking member for locking the wheel mechanism in the forward direction, and after the locking member is unlocked, the wheel mechanism can be steered in an interlocking manner.

[0006] According to one embodiment of the present invention, the holding device comprises a guide rail for holding and guiding the locking member.

[0007] According to one embodiment of the present invention, the retaining device comprises a blocking member, which is arranged between the linking member and the crossbar.

[0008] According to one embodiment of the present invention, when the wheel mechanism is in the forward direction, the locking member is insertable into the blocking member to lock the wheel mechanism in the forward direction.

[0009] According to one embodiment of the present invention, the blocking member comprises a locking groove, and the locking member is insertable into the locking groove.

[0010] According to one embodiment of the present invention, the wheel steering mechanism includes an unlocking member for unlocking the locking member from the blocking member to enable the wheel mechanism to be steered in an interlocked manner.

[0011] According to one embodiment of the present invention, the unlocking member unlocks the locking member and the blocking member via the pulling member.

[0012] According to one embodiment of the present invention, the unlocking member is disposed within the accommodation mechanism, and the accommodation mechanism is fixed to the underside of a cover body that covers the wheel steering mechanism.

[0013] According to one embodiment of the present invention, the blocking member is connected to the storage mechanism or cover body via a tension spring, and is movable so that the blocking member moves away from the crossbar together with the interlocking member when the wheel mechanism returns to the forward direction.

[0014] According to one embodiment of the present invention, an unlocking member is disposed on the receiving mechanism, and the receiving mechanism is fixed to the handlebar of the cart.

[0015] According to one embodiment of the present invention, the blocking member is connected to a fixed portion arranged on the underside of the cover body of the wheel steering mechanism via a tension spring, and when the wheel mechanism returns to the forward direction, the blocking member can move away from the crossbar together with the connecting member.

[0016] According to one embodiment of the present invention, the blocking member has a first long groove, the crossbar has a through hole, and the first guide post passes through the first long groove and the through hole, allowing the blocking member to move relative to the crossbar.

[0017] According to one embodiment of the present invention, the blocking member comprises a U-shaped guide portion connected to the crossbar, the U-shaped guide portion comprising two first long slots parallel to the tension direction of the tension spring.

[0018] According to one embodiment of the present invention, the holding device includes a protective cover for covering the blocking member, the protective cover includes a first protective cover hole, and the first guide post is inserted into the first protective cover hole.

[0019] According to one embodiment of the present invention, on the opposite side of the interlocking member from the crossbar, the protective cover has a second protective cover hole, and the second protective cover hole and the second long groove of the blocking member are used to receive a second guide post.

[0020] According to one embodiment of the present invention, a guide rail is disposed on the protective cover, and a locking member is operatively disposed on the guide rail to realize locking or unlocking of the blocking member.

[0021] According to one embodiment of the present invention, the unlocking member comprises a towing portion, which is towed by movement of the towing portion within the towing chute, such that the locking member unlocks from the blocking member.

[0022] According to one embodiment of the present invention, the accommodation mechanism includes a bottom cover and a lower cover for enclosing an accommodation space for accommodating the unlocking member, and a positioning member disposed in the accommodation space for positioning the unlocking member at different positions so as to move the towing portion.

[0023] According to one embodiment of the present invention, the accommodating mechanism comprises a compression spring supported between the button of the unlocking member and the bottom of the accommodating mechanism, and a fixing member for fixing the positioning member at the end of the bottom of the accommodating mechanism and supporting the compression spring, and the other end of the positioning member can be positioned in multiple grooves of the unlocking member by the compression spring.

[0024] According to one embodiment of the present invention, the wheel mechanism includes a fixed seat pivotally connected to a wheel seat via a connection portion, and the connection portion is pivotally connected to an interlocking member so that the pair of wheel mechanisms move synchronously when steering.

[0025] According to one embodiment of the present invention, the angle range of the left steering or right steering of the wheel mechanism is 30° to 40°.

[0026] According to one embodiment of the present invention, the wheel steering mechanism is a rear wheel steering mechanism.

[0027] According to the present invention, there is provided a cart equipped with the wheel steering mechanism of the present invention. [Brief explanation of the drawings]

[0028] [Figure 1] 1 is a perspective view showing a cart according to a first embodiment of the present invention, with the rear wheels facing forward. [Figure 2] 1 is a perspective view showing a kart according to a first embodiment of the present invention, in which the rear wheels are steered to the left to drift. FIG. [Figure 3] 1 is a perspective view showing a kart according to a first embodiment of the present invention, in which the rear wheels are steered to the right to drift. FIG. [Figure 4] 1 is a bottom view showing a rear wheel steering mechanism of a cart according to a first embodiment of the present invention. FIG. [Figure 5] 1 is a plan view showing a rear wheel steering mechanism of a cart according to a first embodiment of the present invention, with the rear wheels in a forward direction. [Figure 6] 1 is a plan view showing a rear wheel steering mechanism of a kart according to a first embodiment of the present invention, in which the rear wheels are steered to the left to drift. [Figure 7]1 is a perspective view showing a rear wheel steering mechanism of a cart according to a first embodiment of the present invention, in which a holding device, a storage mechanism, and a lock release member are cut away. [Figure 8] 8 is an enlarged view showing the holding device, the accommodation mechanism, and the lock release member cut away in FIG. 7. FIG. [Figure 9] 1 is a rear view showing the rear wheel steering mechanism of the cart according to the first embodiment of the present invention, with the holding device disconnected and the locking member inserted. FIG. [Figure 10] 1 is a rear view showing the rear wheel steering mechanism of the cart according to the first embodiment of the present invention, in which the holding device is disconnected and the locking member is pulled out. FIG. [Figure 11] 1 is a perspective view showing a rear wheel steering mechanism of a cart according to a first embodiment of the present invention, in which a cover body is attached to a holding device. [Figure 12] 1 is a perspective view showing a rear wheel steering mechanism of a cart according to a first embodiment of the present invention, in which a cover body is not attached to a holding device. [Figure 13] 12 is a perspective view showing the rear wheel steering mechanism of the cart according to the first embodiment of the present invention from the opposite side to FIG. 11, with a protective cover attached to the holding device. FIG. [Figure 14] 14 is a perspective view showing the rear wheel steering mechanism of the cart of FIG. 13, in which the holding device, the storage mechanism, and the lock release member are shown in exploded form. [Figure 15] 15 is an exploded perspective view showing an enlarged view of the holding device, the accommodation mechanism, and the lock release member of FIG. 14. FIG. [Figure 16] 1 is a perspective view showing a wheel mechanism for rear wheels of a cart according to a first embodiment of the present invention, with the rear wheels facing forward. [Figure 17] 1 is a perspective view showing a wheel mechanism for rear wheels of a cart according to a first embodiment of the present invention, in which the rear wheels are steered so as to drift to the left. FIG. [Figure 18] 1 is a plan view showing a rear wheel steering mechanism of a cart according to a first embodiment of the present invention, with the rear wheels in a forward direction. [Figure 19]1 is a plan view showing a rear wheel steering mechanism of a cart according to a first embodiment of the present invention, in which the rear wheels are steered to drift to the left. [Figure 20] 1 is a perspective view showing a rear wheel steering mechanism of a cart according to a first embodiment of the present invention, in which only a holding device without a protective cover is attached and the rear wheels are in a forward direction. [Figure 21] 21 is a rear view showing the rear wheel steering mechanism of the cart of FIG. 20, with the storage mechanism and the unlocking member attached, and at this time, the unlocking member is in a locked state. [Figure 22] 22 is an enlarged view of the receiving mechanism and the unlocking member of FIG. 21, where the unlocking member is in a locked state. [Figure 23] FIG. 1 is a perspective view showing the rear wheel steering mechanism of a cart according to a first embodiment of the present invention, in which only a retaining device without a protective cover is attached, the rear wheel is steered to drift to the left, and the locking member is pulled out from the blocking member. [Figure 24] FIG. 24 is a rear view showing the rear wheel steering mechanism of the cart of FIG. 23, with the storage mechanism and the lock release member attached. [Figure 25] 25 is an enlarged view of the accommodation mechanism and the unlocking member of FIG. 24, with the unlocking member in an unlocked state. FIG. [Figure 26] FIG. 10 is a perspective view showing a cart according to a second embodiment of the present invention, with the rear wheels facing forward. [Figure 27] FIG. 10 is a perspective view showing a rear wheel steering mechanism of a cart according to a second embodiment of the present invention, in which a protective cover is attached to a holding device. [Figure 28] FIG. 10 is a perspective view showing a rear wheel steering mechanism of a cart according to a second embodiment of the present invention, in which a protective cover is not attached to a holding device. [Figure 29] 29 is a perspective view of the rear wheel steering mechanism of the cart according to FIG. 28, without the storage mechanism attached. [Figure 30] FIG. 30 is an enlarged view of the holding device and the unlocking member in FIG. 29, with the unlocking member in a locked state. [Figure 31]FIG. 10 is a perspective view showing the rear wheel steering mechanism of the cart, with the storage mechanism not attached and the unlocking member in the unlocked state. [Figure 32] 32 is an enlarged view of the holding device and the unlocking member in FIG. 31, with the unlocking member in an unlocked state. FIG. [Figure 33] FIG. 10 is a front perspective view showing a cart according to a third embodiment of the present invention. [Figure 34] FIG. 10 is a rear perspective view showing a cart 1 according to a third embodiment of the present invention. [Figure 35] FIG. 10 is a bottom perspective view showing a cart 1 according to a third embodiment of the present invention. [Figure 36] 35 is a rear perspective view of the cart 1 according to FIG. 34, without the cover body attached. FIG. [Figure 37] 37 shows a rear perspective view of the cart 1 according to FIG. 36, without the protective cover of the holding device and with the locking member inserted. [Figure 38] 38 is a rear perspective view of the cart corresponding to FIG. 37, with the protective cover of the holding device removed and the locking member withdrawn. [Figure 39] 10 shows a handlebar according to a third embodiment of the present invention, with the lock release member in a locked state. [Figure 40] 10 shows a handlebar according to a third embodiment of the present invention, with the unlocking member in an unlocked state. [Figure 41] 10 shows a handlebar according to a third embodiment of the present invention, in which the unlocking member has a retention function. DETAILED DESCRIPTION OF THE INVENTION

[0029] Although the invention is described herein with reference to specific embodiments, the invention should not be limited to the details shown. Rather, various changes can be made to these details, within the scope and range of equivalents of the claims, without departing from the invention.

[0030] The descriptions of directions such as "front," "rear," "upper," and "lower" in this specification are for ease of understanding, and the present invention is not limited to these directions and can be adjusted according to actual circumstances. Although the present invention has been described with reference to exemplary embodiments, the terms used are illustrative and not limiting.

[0031] Because the present invention can be specifically embodied in various forms without departing from its spirit or essence, the above-described embodiments are not limited to any of the above details, but should be interpreted most broadly within the scope defined by the claims, and therefore, all changes that come within the scope of the claims or equivalents thereof should be understood to be embraced within the scope of the claims.

[0032] The basic structural principle of the present invention is that when the button of the unlocking member is operated, the traction member drives the locking member to unlock, and the rear wheels are held in a shiftable state.

[0033] The technical problem to be solved by the present invention is to provide a cart, especially a cart with large rear wheels, especially a stroller, and to prevent the cart from becoming unstable by controlling the drift of the rear wheels within a certain range, and the first, second and third embodiments can have a drift control function. The embodiments of the present invention have a simple structure and are easy to operate.

[0034] The present invention will be described in detail below with reference to the drawings. FIGS. 1 to 25 show the configuration of a cart 1 according to a first embodiment of the present invention.

[0035] 1 is a perspective view showing a kart 1 according to a first embodiment of the present invention, with rear wheels 410 facing forward. In this case, the rear wheels 410 may be in a drift-locked state or a drift-enabled state.

[0036] In this embodiment, the cart 1, which may be a stroller in particular, has a frame 200, a handlebar 300, four wheel mechanisms 400, and a wheel steering mechanism 100. The frame 200 is preferably assembled from a plurality of hollow rods, for example, by connecting parts, which allows the stroller 1 to be folded, for example. Similarly, the handlebar 300 is preferably assembled from a hollow rod and is connected to the upper part of the frame 200 in a manner that is inserted into the upper part of the frame 200 in order to propel the stroller 1. In this embodiment, four wheel mechanisms 400 are symmetrically arranged in pairs on the underside of the vehicle frame 200, and two wheel mechanisms 400 located at the front of the stroller 1 are used for the cart's front wheels 410, and two wheel mechanisms 400 located at the rear of the stroller 1 are used for the cart's rear wheels 410. According to this embodiment, in particular, the cart rear wheels 410 may be larger than the cart front wheels 410, and the wheel mechanisms 400 used for the cart rear wheels 410 each include a wheel 410 and a fixed base 420. The fixed base 420 is pivotally connected to the wheel 410 and pivotally coupled to the lower rear part of the frame 200. The rear wheel 410 is pivotally connected to the frame 200 via the fixed base 420, so that the rear wheel 410 can be steered left and right, and thus can be set in the forward direction indicated by the arrow in FIG. 1, the left steering direction (see FIG. 2), or the right steering direction (see FIG. 3). The forward direction here refers to the direction in which the rear wheel 410 faces the same direction as the forward direction of the cart 1, i.e., the direction in which the wheel 410 faces as shown in FIG. 1.

[0037] According to this embodiment, the stroller 1 is equipped with a rear wheel steering mechanism 100 on the rear wheels 410. FIG. 1 shows a cover body 140 for the rear wheel steering mechanism 100 located between the two rear wheels 410 or the two rear wheel mechanisms 400. The cover body 140 is fixed to the frame 200, for example, and can be selectively used for standing a child or placing items. A lock release holding assembly (described in detail below) is provided to lock and unlock the rear wheel steering mechanism 100. A button 135 of the lock release member 130 of the lock release holding assembly extends upward from a perforation on the rear upper surface of the cover body 140. A user can press or step on the button 135 to release the rear wheels 410 from a drift locked state or to place the rear wheels 410 in a drift unlocked state. When the rear wheels 410 are locked, the stroller 1 can only travel in a straight line, and when the rear wheels 410 are unlocked, the stroller 1 can rotate left or right by a certain angle (see FIGS. 2 and 3). According to the present invention, the range of rotation of the rear wheels 410 is preferably 30° to 40°, but the present invention is not limited thereto.

[0038] FIG. 2 is a perspective view showing the kart 1 according to the first embodiment of the present invention, in which the rear wheels 410 are steered to the left to drift.

[0039] Unlike FIG. 1, in FIG. 2, for example, the drift lock of the rear wheel 410 is released by pushing or stepping on the unlocking member 130, in which case the rear wheel 410 is steered left so that it is aligned with the left steering direction.

[0040] 3 is a perspective view of a cart 1 according to a first embodiment of the present invention, in which the rear wheels 410 are steered to drift in the right steering direction. This figure shows that the rear wheels 410 are steered right in the right steering direction until a certain state after the drift is unlocked.

[0041] As can be seen from Figures 1 to 3, the rear wheel 410 of the present invention travels linearly in the forward direction and after being unlocked from the drift-locked state, the rear wheel 410 can be rotated left and right by a certain angle, improving the operability of the stroller 1 when in use.

[0042] FIG. 4 is a bottom view showing the rear wheel steering mechanism 100 of the cart 1 according to the first embodiment of the present invention. This figure shows the remaining components of the rear wheel steering mechanism 100 that are covered by the cover body 140 in FIGS. 1 to 3, including the retaining device 110, the receiving mechanism 120, the crossbar 150, and the interlocking member 160. The retaining device 110, the receiving mechanism 120, and the unlocking member 130 including the button 135 described above constitute the main components of the unlocking and holding assembly. The unlocking and holding assembly is used to enable the pair of wheels 410 attached to the wheel steering mechanism 100 to be switched between a forward direction and a steering direction.

[0043] The crossbar 150 connects the two wheel seats 210 of the stroller 1 or connects other parts of the frame 200 near the wheel seats 210. The wheel seats 210 are located on the underside of the frame 200 at the rear ends of rods extending in the forward direction, and are pivotally connected to the wheel mechanisms 400 so that the two wheel mechanisms 400 can deviate left and right from the forward direction to achieve left and right drift of the rear wheels 410. In order to achieve stable steering drift by rotating the rear wheels 410 left and right synchronously by a certain angle, according to the present invention, the crossbar 150 is located on the two wheel seats 210 or other parts of the frame 200 near the wheel seats 210 so as to limit the forward position of the retaining device 110 of the rear wheel steering mechanism 100 (described in detail later).

[0044] According to the present invention, the interlocking member 160 is pivotally disposed between the fixed seats 420 of the rear wheels 410, or preferably between the connection portions 421 of the fixed seats 420 connected to the wheel seats 210, so that the two rear wheels 410 can be rotated together while drifting left and right, and at the same time, the rearward position of the holding device 110 of the rear wheel steering mechanism 100 is advantageously limited (as will be described in detail later). The crossbar 150 and the interlocking member 160 are disposed parallel to each other in the horizontal direction.

[0045] As shown in FIG. 4 , the two pivot points 211 between the wheel base 210 and the fixed base 420 and the two pivot points 422 between the interlocking member 160 and the fixed base 420 or the connecting portion 421 form a rectangular mechanical structure when the rear wheel 410 is in the forward direction (see the four-dot connecting line in FIG. 5 ). When the rear wheel 410 is steered left or right, the rectangular mechanical structure transforms into a non-rectangular parallelogram mechanical structure (see the four-dot connecting line in FIG. 6 ). According to the above-described mechanical structure relationship, the four pivot points 211, 422, which are formed in a dotted shape, are arranged to allow the rear wheel 410 to drift. When the drift lock is released, the rear wheel 410 can rotate left or right by a certain angle around the four dots. When the rear wheel 410 rotates (drifts), the interlocking member 160 can be displaced parallel and / or perpendicular to the crossbar 150. As a result, the two rear wheels 410 can move synchronously and stably while being steered left and right, and drift steering of the rear wheels 410 of the stroller 1 can be realized.

[0046] Furthermore, according to the present invention, a retaining device 110 is disposed between the interlocking member 160 and the crossbar 150 to maintain the distance between the interlocking member 160 and the crossbar 150 when the interlocking member 160 moves in the front-to-rear direction, and to obtain a more stable rotation angle for left and right steering. In FIG. 4, the blocking member 111 of the retaining device 110 can be seen. The front side of the blocking member 111 abuts against the crossbar 150, and the first guide post 152A passes through the first long groove 112A of the blocking member 111 and the through-hole 151 (not shown) of the crossbar 150, thereby fixing the protective cover 115 to the crossbar 150 and guiding the blocking member 111 to move back and forth in a direction perpendicular to the crossbar 150. The rear side of the blocking member 111 may partially or completely abut against the interlocking member 160, so that when the interlocking member 160 moves forward, the blocking member 111 moves toward the crossbar 150, maintaining the interlocking member 160 at a certain distance from the crossbar 150. To realize the rearward displacement of the blocking member 111, tension springs 113 are provided according to the present invention, and preferably, two tension springs 113 are provided. According to this embodiment, one end of each tension spring 113 is connected to the blocking member 111, and the other end of each tension spring 113 is connected to an accommodation mechanism 120 (not shown) for accommodating the unlocking member 130, but may also be connected to the underside of the cover body 140, for example.

[0047] The accommodation mechanism 120 is connected to the underside of the cover body 140 via a connection portion 124 and includes a bottom cover 122 and a lower cover 121. The bottom cover 122 and the lower cover 121 enclose an accommodation space for accommodating an unlocking member 130 (not shown). A tension spring contact point 123, for example in the form of a contact tab, for connecting a tension spring 113 is provided on the side of the lower cover 121 facing the blocking member 111. When the rear wheel 410 returns from the steering direction to the forward direction, causing the interlocking member 160 to be displaced in a direction away from the crossbar 150, the interlocking member 160 is displaced rearward in a reset manner due to the contraction of the tension spring 113 via the accommodation mechanism 120 fixedly connected to the cover body 140, and can be applied to the interlocking member 160.

[0048] FIG. 5 is a plan view showing the rear wheel steering mechanism 100 of the cart 1 according to the first embodiment of the present invention. In FIG. 5, the cover body 140 is removed, revealing the button 135 of the unlocking member 130 housed in the housing mechanism 120. The blocking member 111 shown in FIG. 4 is covered by a protective cover 115, which is fixedly connected to the cover body 140 or formed integrally with the cover body 140. The protective cover 115 has a first protective cover hole 116A corresponding to the positions of the first long groove 112A of the blocking member 111 and the through hole 151 of the crossbar 150 in FIG. 4. The first guide post 152A passing through the first long groove 112A and the through hole 151 can also pass through the protective cover hole 116A. According to this embodiment, the protective cover 115 preferably has a second protective cover hole 116B on the other side of the interlocking member 160. The second protective cover hole 116B cooperates with the corresponding second long groove 112B of the blocking member 111 to allow the second guide post 152B to pass through the second protective cover hole 116B and the second long groove 112B, thereby better limiting the position of the blocking member 111 and realizing guided forward and backward displacement of the blocking member 111. FIG. 5 also shows the guide rail 117 of the holding device 110 and the locking member 114 disposed on the guide rail 117. The locking member 114 and the guide rail 117 are preferably disposed on both sides of the protective cover 115 and the blocking member 111. According to the present invention, the guide rail 117 is integrally formed on the protective cover 115 to hold and guide the left-right movement of the locking member 114 (see FIG. 15 ). The locking member 114 is operably disposed on the guide rail 117 of the protective cover 115 and has a locked position and an unlocked position relative to the blocking member 111. According to other embodiments, the guide rail 117 and the locking member 114 may be disposed on the cover body 140 , or the guide rail 117 and the locking member 114 may be disposed on the interlocking member 160 .

[0049] In the locked position, the locking member 114 locks the blocking member 111 between the interlocking member 160 and the crossbar 150, so that the interlocking member 160 remains stationary relative to the crossbar 150. In the unlocked position, the locking member 114 releases the lock on the blocking member 111, so that the interlocking member 160 and the crossbar 150 can slide or move relative to each other. That is, when the locking member 114 is inserted into the blocking member 111, it is used to lock the wheel mechanism 400 in the forward direction. After being unlocked via the operatively connected lock release member 130, the locking member 114 is withdrawn from the blocking member 111, allowing the wheel mechanism 400 to steer in an interlocked manner. Specifically, when the rear wheel 410 is in the forward position, the locking member 114 can, for example, be inserted into the blocking member 111 to limit the forward / rearward displacement of the blocking member 111. In FIG. 5, the locking member 114 can be inserted into the blocking member 111 to lock the wheel 410 in the forward direction. At this time, the button 135 is not pressed or stepped on, and in the example shown in this figure, the locking member 114 is simply pulled out of the blocking member 111 and is in an unlocked state with a portion still inside the protective cover 115, so that the wheels 410 can be steered left and right at any time. At this time, the button 135 must be pressed or stepped on.

[0050] 6 is a plan view showing the rear wheel steering mechanism 100 of the cart 1 according to the first embodiment of the present invention. In FIG. 6, the rear wheel 410 is steered to drift to the left, and the button 135 is in a pressed or depressed state.

[0051] 7 is a perspective view showing the rear wheel steering mechanism 100 of the cart 1 according to the first embodiment of the present invention. In FIG. 7, the holding device 110, the receiving mechanism 120, and the unlocking member 130 of the unlocking holding assembly are disconnected, the rear wheels 410 are in the forward direction, and the locking member 114 may be in an inserted state or a withdrawn state.

[0052] FIG. 8 is an enlarged view of the retaining device 110, receiving mechanism 120, and unlocking member 130 of the unlocking retention assembly shown in FIG. 7, showing the crossbar 150 and interlocking member 160 at the same time.

[0053] 8 shows the through-hole 151 in the crossbar 150 for guiding the first guide post 152A and the first protective cover hole 116A in the protective cover 115. The blocking member 111 has a U-shaped guide portion 119 located at its front end and spanning the crossbar 150. The U-shaped guide portion 119 has an opening that opens forward for attaching the crossbar 150, and the crossbar 150 is movable within the U-shaped guide portion 119. Two corresponding first long grooves 112A that are parallel to the tension direction of the tension spring 113 are provided on the upper and lower walls of the U-shaped guide portion 119 on the two legs of the U. Among these, a first guide post 152A (not shown) penetrates the first protective cover hole 116A, the two first long grooves 112A, and the corresponding through-hole 151 of the crossbar 150 at a position overlapping the crossbar 150, fixing the position of the blocking member 111 in the longitudinal direction of the crossbar 150 and guiding the blocking member 111 to move toward or away from the crossbar 150 in the tension direction of the tension spring 113. On the other side of the interlocking member 160, the protective cover 115 and the blocking member 111 have a second protective cover hole 116B and a second long groove 112B having the same shape as the first protective cover hole 116A and the first long groove 112A, so that another guide post (not shown) can guide the displacement of the blocking member 111 in the forward and backward directions.

[0054] In FIG. 7, the rear wheel 410 is in the forward direction, so the locking member 114 can be inserted or pulled out on the guide rail 117 accordingly.

[0055] The receiving mechanism 120 is connected to the blocking member 111 via a tension spring 113, which is connected to a bottom cover 121 of the receiving mechanism 120. After removing the bottom cover 122 of the receiving mechanism 120, the internal components of the receiving mechanism 120 and the unlocking member 130 can be seen in detail in FIG.

[0056] The internal components of the accommodating mechanism 120 include a compression spring 126 supported between the button 135 and the bottom of the accommodating mechanism 120 and fixed to the button 135 and the bottom of the accommodating mechanism 120, respectively, a positioning member 127 for positioning the unlocking member 130, and a fixing member 125 for pivotally fixing the positioning member 127 at the end of the bottom of the accommodating mechanism 120 and supporting the compression spring 126.

[0057] The unlocking member 130 includes a button 135, a puller 131 connected to the underside of the button 135, a chute 132 attached to the puller 131, and a passage 133. The puller 131 moves up and down together with the button 135 and pulls a puller member 134 (not shown) of the unlocking member 130 inside the chute 132, which is then pulled by the up and down movement of the puller 131, thereby pulling the locking member 114 out of the blocking member 111. The passage 133 has a plurality of grooves 133A, 133B, 133C, 133D, and 133E. The specific structures and functions of the plurality of grooves 133A, 133B, 133C, 133D, and 133E will be described in detail later with reference to other drawings.

[0058] According to the present invention, when pressed or stepped on, the other movable end of the positioning member 127 can be moved in a positioned manner in multiple grooves 133A, 133B, 133C, 133D, and 133E of the passage portion 133 of the lock release member 130 by the compression spring 126, so that as the pulling portion 131 moves, the pulling member 134 of the chute 132 pulls the lock member 114 out of the blocking member 111. As shown in the figure, the passage portion 133 is non-through, and the two free ends of the movable end of the positioning member 127 can be respectively inserted into the passage portions 133 on both sides. Furthermore, the passage portion 133 may be an integral through-type.

[0059] 9 is a rear view showing the rear wheel steering mechanism 100 of the cart 1 according to the first embodiment of the present invention. In this figure, the holding device 110 is disengaged, and the locking member 114 is inserted into or locked in the blocking member 111. Therefore, the blocking member 111 has locking grooves 118A on both sides, and the protective cover has locking grooves 118B on both sides. The locking members 114, which are arranged on guide rails 117 on both sides of the protective cover 115, are guided and inserted into the locking grooves 118A and 118B when the rear wheels 410 are in the forward direction, thereby locking the drift steering of the rear wheels 410.

[0060] FIG. 10 is a rear view showing the rear wheel steering mechanism 100 of the cart 1 according to the first embodiment of the present invention. In this figure, the holding device 110 is disconnected and the locking member 114 is pulled out. In this embodiment, the locking member 114 is pulled out from the opening of the protective cover 115. However, the locking member 114 may be pulled out only from the locking groove 118A (see FIG. 15) of the blocking member 111, with its end remaining in the locking groove 118B (see FIG. 15) of the protective cover 115. In FIG. 10, the rear wheel 410 is in the forward direction, and the blocking member 111 is unlocked by the locking member 114, so the stroller 1 can be steered in any direction at any time.

[0061] 9 and 10 exemplarily show other embodiments of the interlocking member 160, which can be connected to the connecting pipes or joints on both sides of the cart in various possible forms. For example, unlike the embodiment shown in FIG. 5 in which the diameter of the middle of the interlocking member 160 is larger than the diameters at both ends, the interlocking member 160 shown in FIGS. 9 and 10 has a smaller diameter than the joints on both sides of the cart 1, and the interlocking member 160 is indirectly connected to the joints via other connecting components. According to the exemplary embodiment, the interlocking member 160 can be flexibly designed to accommodate other components of the cart, such as blocking members. Alternatively, the diameter of the interlocking member 160 may remain unchanged.

[0062] 11 to 15 show the holding device 110, the accommodation mechanism 120, and the lock release member 130 from different angles.

[0063] FIG. 11 is a perspective view showing the rear wheel steering mechanism 100 of the cart 1 according to the first embodiment of the present invention, with a protective cover 115 attached to the holding device 110. FIG. 12 shows the holding device 110 of FIG. 11, with the protective cover 115 not attached to the holding device 110. FIG. 13 is a perspective view showing the rear wheel steering mechanism 100 of the cart 1 as seen from the opposite side to FIG. 11, with the protective cover 115 attached to the holding device 110. FIG. 14 is a perspective view showing the rear wheel steering mechanism 100 of the cart 1 of FIG. 13, with the holding device 110, storage mechanism 120, and lock release member 130 shown exploded.

[0064] FIG. 15 is an exploded perspective view showing an enlarged view of the holding device 110, the accommodation mechanism 120, and the lock release member 130 of FIG.

[0065] According to this embodiment, the holding device 110 is disposed in the through hole 151 of the crossbar 150 between the crossbar 150 and the interlocking member 160, and includes a blocking member 111 and a protective cover 115 that covers the blocking member 111.

[0066] On one side of the interlocking member 160, the blocking member 111 has a U-shaped guide portion 119 that straddles the crossbar 150. The U-shaped guide portion 119 has two first long grooves 112A located on either side of the through-hole 151 and parallel to the tension direction of the tension spring 113. On the other side of the interlocking member 160, the blocking member has a second long groove 112B that matches the shape and direction of the two first long grooves 112A. To save material, the second long groove 112B may be arranged, for example, on the protrusion shown in the figure. On two side surfaces of the blocking member 111 transverse to the longitudinal direction of the first long groove 112A and the second long groove 112B, locking grooves 118A are arranged for operatively connecting and particularly inserting the locking member 114.

[0067] The protective cover 115 has an outer shape that matches the blocking member 111, and has first and second protective cover holes 116A and 116B that correspond to the first and second long grooves 112A and 112B, two locking grooves 118B that correspond to the locking groove 118A, and guide rails 117 extending from two side surfaces. The guide rails 117 are aligned with the locking slots 118B to hold the locking member 114 and guide the sliding of the locking member 114.

[0068] When assembly is complete, the guide post 152A passes through the two first long grooves 112A and the through hole 151 and is inserted into the first protective cover hole 116A, guiding the blocking member 111 to slide vertically relative to the crossbar 150.

[0069] According to this embodiment, the receiving mechanism 120 includes a bottom cover 122 and a lower cover 121. The bottom cover 122 and the lower cover 121 enclose a receiving space for receiving the unlocking member 130, and a compression spring 126, a fixing member 125, and a positioning member 127 are disposed within the receiving space. The cooperative relationship between the compression spring 126, the fixing member 125, and the positioning member 127 is shown in FIG. 8, for example, and will be described again later. The side of the lower cover 121 facing the blocking member 111 is provided with tension spring contact points 123 in the form of contact tabs for connecting the tension spring 113. The bottom cover 122 is provided with connection portions 124 at both ends for connecting to the underside of the cover body 140, and the connection portions 124 are through-holes for passing through fixing members such as screws. Receptacles 128 for engaging with fixing members 125 are arranged on the undersides of lower cover 121 and bottom cover 122, and only half of the receptor 128 provided on lower cover 121 is visible in the drawing.

[0070] According to this embodiment, the unlocking member 130 has a button 135 and a traction part 131 connected to the underside of the button 135. In the figure, chutes 132 symmetrically arranged on both sides of the traction part 131 can be clearly seen. The chutes 132 are used to receive the traction member 134 connected to the locking member 114.

[0071] According to this embodiment, at least one of the bottom cover 122 and the lower cover 121 is provided with lateral slots 129A and 129B corresponding to the chute 132, and one end of the traction member 134 can also be arranged to pass through the lateral slots 129A and 129B and move along the lateral slots 129A and 129B.

[0072] Fig. 16 is a perspective view showing the wheel mechanism 400 for the rear wheel of the cart 1 according to the first embodiment of the present invention, with the rear wheel 410 facing forward. Fig. 17 is a perspective view showing the wheel mechanism 400 for the rear wheel 410 of the cart 1 according to the first embodiment of the present invention, with the rear wheel 410 being steered to drift leftward.

[0073] 16 and 17 mainly show the connection part 421 between the fixed seat 420 of the wheel mechanism 400 and the wheel seat 210 of the frame 200. The left connection part 421 differs from the right connection part 421 in that the cover part has been removed from the left connection part 421 to reveal a bell-mouth-shaped notch 423 inside the connection part 421, and the interlocking member 160 is pivotally connected to the connection part 421 via a pivot point 422 at the bottom of the bell-mouth. This notch advantageously prevents the connection part 421 from interfering with the interlocking member 160 when the rear wheel 410 rotates. FIG. 16 shows the state before the rear wheel 410 rotates, and FIG. 17 shows the state after the rear wheel 410 has rotated.

[0074] 18 to 25 are diagrams illustrating the operation of the lock release member 130. FIG.

[0075] 18 is a plan view showing the rear wheel steering mechanism 100 of the cart 1 according to the first embodiment of the present invention, showing the state in which the rear wheels 410 are in the forward direction. In this figure, the unlocking member 130 is not pressed or stepped on, the locking member 114 is locked to the blocking member 111, the rear wheels 410 are in a drift lock state, and the stroller 1 can only move forward.

[0076] 19 is a plan view showing the rear wheel steering mechanism 100 of the cart 1 according to the first embodiment of the present invention, illustrating a state in which the rear wheel 410 is steered to drift to the left. In this figure, the unlocking member 130 is pressed or stepped on, the locking member 114 is pulled out from the blocking member 111, and the rear wheel 410 is placed in a state in which it can be drift-steered, making the stroller 1 steerable.

[0077] 20 is a perspective view showing the rear wheel steering mechanism 100 from another angle, with only the retaining device 110 without the protective cover 115 attached, and the rear wheel 410 facing forward. In this figure, the interlocking member 160 is located away from the crossbar 150, the guide post 152A (not shown) is located at a first position along the first long groove 112A, for example, at the front end of the first long groove 112A (along the direction of the single arrow), the blocking member 111 is pressed against the interlocking member 160 by the action of the tension spring 113 (see FIG. 8), and the locking member 114 is inserted into the blocking member 111, thereby achieving a drift lock state.

[0078] Figure 21 is a rear view showing the rear wheel steering mechanism 100 of the cart 1 of Figure 20. This figure shows the storage mechanism 120 and the unlocking member 130 in the locked state.

[0079] FIG. 22 is an enlarged view of the receiving mechanism 120 and the unlocking member 130 in FIG. 21. At this time, the unlocking member 130 is in a locked state for inserting or locking the locking member 114 shown in FIG. 20 into the blocking member 111. At this time, the button 135 of the unlocking member 130 is not pressed or stepped on, the traction portion 131 connected to the button 135 is at its highest position, and the traction members 134 (not shown) located in the two chutes 132 of the traction portion 131 do not exert a pulling action on the locking member 114, allowing the locking member 114 to be inserted into the blocking member 111 in FIG. 20. The fixing member 125 is engaged with the lower receiving portion 128 of the lower cover 121. The fixing member 125 pivotally fixes the lower end of the positioning member 127 and supports the compression spring 126. The positioning member 127 is used to position the traction portion 131. The upper or movable end of positioning member 127 is located in passageway 133. Passageway 133 includes a continuous passageway with five grooves 133A, 133B, 133C, 133D, and 133E, and the movable end of positioning member 127 is currently located in groove 133A. At this time, button 135 is not pressed or stepped on.

[0080] Contrary to FIG. 20 , FIG. 23 is a plan view showing the rear wheel steering mechanism 100 of the cart 1 according to the first embodiment of the present invention, in which only the retaining device 110 without the protective cover 115 is attached. The rear wheel 410 is steered to drift leftward, and the locking member 114 is pulled out from the blocking member 111. When the rear wheel 410 is steered to drift leftward, the interlocking member 160 moves leftward in the direction of the double arrow from the position shown in FIG. 20 . During this movement, due to the parallelogram relationship described above, the interlocking member 160 moves the blocking member 111 toward the crossbar 150 in the direction of the single arrow, and the blocking member 111 slides forward so that the guide post 152A (not shown) is switched from the first position of the first long groove 112A to a second position, for example, the rear end of the first long groove 112A (in the direction of the single arrow). At this time, the blocking member 111 is applied to the crossbar 150, so that the drift holding function of the rear wheel 410 can be realized at an advantageous angle.

[0081] FIG. 24 is a diagram corresponding to FIG. 21 and is a rear view showing the rear wheel steering mechanism 100 of the cart 1 of FIG. 23, in which the storage mechanism 120 and the unlocking member 130 in the unlocked state are attached.

[0082] Figure 25 is an enlarged view of the receiving mechanism 120 and the unlocking member 130 of Figure 24. As shown in the figure, at this time, the unlocking member 130 is in an unlocked state, the locking member 114 is pulled out from the blocking member 111, and the button 135 is pressed or stepped on once and is in a low position (not the lowest position).

[0083] According to this embodiment (see Figures 22 and 25 simultaneously), the unlocking member 130 unlocks the locking member 114 by pulling it out of the blocking member 111, and locks the locking member 114 by inserting it into the blocking member 111 in the following manner.

[0084] When unlocking, when button 135 of unlocking member 130 is pressed to its maximum stroke (i.e., it is no longer pressed), and then released by the user's hand or foot, button 135 first moves traction portion 131 downward together with passage portion 133, compressing compression spring 126. As a result, the movable end of positioning member 127 moves upward from groove 133A along passage portion 133, with the pivotally fixed end of fixing member 125 as its pivot axis, passes through groove 133B of passage portion 133 at the leftmost end in the drawing, and then moves toward groove 133C. Button 135 reaches its maximum stroke at groove 133C (at which point the user releases his / her hand or foot), and compression spring 126 resets button 135, causing the movable end to finally stop in groove 133D, as shown in FIG. In this case, the chute 132 also moves downward, thereby moving the towing member 134 or its head (not shown) inside the chute 132, and the locking member 114 connected to the other end of the towing member 134 is pulled out from the locking groove 118A of the blocking member 111, thereby releasing the lock.

[0085] When locking, button 135 is pressed to the maximum stroke again (i.e., it is no longer pressed), and then when the user releases his / her hand or foot, button 135 first moves upward along passage 133 from groove 133D, with the pivotally fixed end of fixing member 125 as the pivot axis, and then moves traction part 131 downward together with passage 133 so that the movable end of positioning member 127 reaches groove 133E of passage 133 at the rightmost end in the drawing. Button 135 reaches the maximum stroke at groove 133E, and when the user releases his / her hand or foot at this time, compression spring 126 resets button 135, causing the movable end to move to groove 133A and finally stop in groove 133A, as shown in FIG. 22 . In this case, the chute 132 also moves upward, thereby moving the towing member 134 or its head inside the chute 132, and the locking member 114 connected to the other end of the towing member 134 is inserted into the locking groove 118A of the blocking member 111, thereby locking it.

[0086] According to the above-mentioned continuous process, the present invention can easily lock and unlock the drift steering function by pressing or stepping on it twice discontinuously, making it easier for the user to operate and use.

[0087] 26 to 32 show the structure of a cart 1 according to a second embodiment of the present invention. Unlike the first embodiment, the unlocking member 130 of the wheel steering mechanism 1 according to the second embodiment is arranged to extend horizontally from the rear side of the cover body 140, and therefore the storage mechanism 120 and the unlocking member 130 are also arranged horizontally.

[0088] FIG. 26 is a perspective view showing a cart 1 according to a second embodiment of the present invention, with the rear wheels facing forward.

[0089] In the second embodiment, the cart 1, which may be a stroller 1 in particular, has a frame 200, a handlebar 300, four wheel mechanisms 400, and a wheel steering mechanism 100. The frame 200 is preferably assembled from a plurality of hollow rods, for example, by connecting parts, which allows the stroller 1 to be folded, for example. Similarly, the handlebar 300 is preferably assembled from a hollow rod and is connected to the upper part of the frame 200 in a manner that inserts it into the upper part of the frame 200 in order to propel the stroller 1. In this embodiment, four wheel mechanisms 400 are symmetrically arranged in pairs on the underside of the vehicle frame 200, and two wheel mechanisms 400 located at the front of the stroller 1 are used for the cart front wheels 410, and two wheel mechanisms 400 located at the rear of the stroller 1 are used for the cart rear wheels 410. The wheel mechanisms 400 used for the cart rear wheels 410 each include a wheel 410 and a fixed base 420. The fixed base 420 is pivotally connected to the wheel 410 and pivotally coupled to the rear lower part of the frame 200. The rear wheel 410 is pivotally connected to the frame 200 via the fixed base 420, so that the rear wheel 410 can be steered left and right, and thus the rear wheel 410 can be set to a forward direction, a right-steered direction (see FIG. 2), or a left-steered direction (see FIG. 3). The forward direction here refers to the direction in which the rear wheel 410 faces the same direction as the forward direction of the cart 1, i.e., the direction in which the wheel 410 faces as shown in FIG. 26.

[0090] According to the second embodiment, the stroller 1 includes a rear wheel steering mechanism 100 on the rear wheel 410. FIG. 26 shows a cover body 140 for the rear wheel steering mechanism 100, located between the two rear wheels 410 or the two rear wheel mechanisms 400. The cover body 140 is fixed to the frame 200, for example, and can be selectively used for allowing a child to stand or placing an object. The button 135 of the unlocking member 130 for the rear wheel steering mechanism 100 extends horizontally rearward from a perforation on the side of the cover body 140. A user can press or step on the button 135 to release the rear wheel 410 from a drift-locked state. According to this embodiment, the upper surface of the cover body 140 is not obstructed by the button 135, making it smoother and more convenient for a child to stand or place an object. Specifically, the button 135 controls the rear wheel steering mechanism 100 to be locked or unlocked. When the rear wheels 410 are locked, the stroller 1 can only travel in a straight line, and when the rear wheels 410 are unlocked, the stroller can rotate left or right by a certain angle. According to the present invention, the range of rotation of the rear wheels 410 is preferably 30° to 40°, but the present invention is not limited thereto.

[0091] 27 is a perspective view showing a rear wheel steering mechanism 100 of a cart 1 according to a second embodiment of the present invention, in which a protective cover 115 is attached to the holding device 110. Unlike the first embodiment, the storage mechanism 120 in this embodiment is arranged horizontally, the unlocking member 130 extends horizontally rearward from a storage space surrounded by the lower cover 121 and the bottom cover 122 of the storage mechanism 120, the tension spring 113 of the storage mechanism 110 is fixed horizontally in a corresponding recess in the bottom cover 121, and the protrusion of the blocking member 111 for locating the long groove 112b can also extend into the recess. This embodiment advantageously allows the unlocking and holding assembly, i.e., the holding device 110, the storage mechanism 120, and the unlocking member 130 in particular, to be arranged more compactly.

[0092] Figure 28 is a perspective view showing a rear wheel steering mechanism 100 of a cart 1 according to a second embodiment of the present invention. As shown in the figure, the protective cover 115 has been removed from the holding device 110. The holding device 110 of the second embodiment is basically the same in structure and function as the holding device 110 of the first embodiment, except for the shape of the connection portion between the tension spring 113 and the blocking member 111 (see Figure 15). Two different embodiments of the connection portion are shown by way of example, but the present invention is not limited thereto.

[0093] FIG. 29 is a perspective view showing the rear wheel steering mechanism 100 of the cart 1 shown in FIG. 28. As shown in the figure, the lower cover 121 and the bottom cover 122 of the storage mechanism 120 have been removed to better illustrate the interaction between the holding device 110 and the unlocking member 130. At this time, the unlocking member 130 is in a locked state with the locking member 114 inserted into the blocking member 111. In FIG. 29, the interlocking member 160 is located away from the crossbar 150, the guide post 152A (not shown) is located at a first position along the first long groove 112A, for example, at the front end of the first long groove 112A (along the direction of the single arrow), and the blocking member 111 is pressed against the interlocking member 160 (see FIG. 8) by the action of the tension spring 113, thereby achieving a drift-locked state.

[0094] Figure 30 is an enlarged view of the holding device 110 and the unlocking member 130 in Figure 29 (which can be understood by referring to Figure 22 of the first embodiment). As shown in the figure, at this time, the unlocking member 130 is in a locked state, the locking member 114 is inserted into the blocking member 111, and the button 135 is not pressed or depressed and is at the position farthest from the holding device 110. The end of the tension spring 113 on one side of the unlocking member 130 is currently in a disconnected and unforced state. The compression spring 126, positioning member 127, and fixing member 125 belonging to the receiving mechanism 120 cooperate with each other, and the movable end of the positioning member 127 is currently located in the groove 133A of the passage portion 133.

[0095] FIG. 31 is a perspective view showing the rear wheel steering mechanism 100 of the cart 1. Compared with FIG. 29, at this time, the lock release member 130 is in an unlocked state, and the lock member 114 is pulled out from the blocking member 111. In the state shown in FIG. 31, the interlocking member 160 is movable left and right substantially parallel to the crossbar 150. During the movement process, the interlocking member 160 moves the blocking member 111 toward the crossbar 150 in the direction of the arrow, and the blocking member 111 slides forward (along the direction of the arrow) so that the guide post 152A (not shown) moves rearward along the first long groove 112A to a second position, for example, the rear end of the first long groove 112A. At this time, the blocking member 111 is pressed against the crossbar 150, enabling the drift retention function of the rear wheel 410 to be realized at an advantageous angle.

[0096] Figure 32 is an enlarged view of the holding device 110 and the unlocking member 130 (which can be understood by referring to Figure 25 of the first embodiment) in Figure 31. As shown in the figure, at this time, the unlocking member 130 is in an unlocked state, the locking member 114 is pulled out from the blocking member 111, and the button 135 is pressed or stepped on once and is in a position close to the holding device 110 (not the closest position).

[0097] According to this embodiment (see Figures 30 and 32 simultaneously), the unlocking member 130 unlocks the locking member 114 by pulling it out of the blocking member 111, and locks the locking member 114 by inserting it into the blocking member 111 in the following manner.

[0098] To release the lock, button 135 of unlocking member 130 is pressed to its maximum stroke (i.e., it is no longer pressed), and then when the user releases his / her hand or foot, button 135 first moves traction portion 131 together with passage 133 toward holding device 110, compressing compression spring 126. As a result, the movable end of positioning member 127 moves from groove 133A along passage 133, with the pivotally fixed end of fixing member 125 as its pivot axis, passes through groove 133B of passage 133 at the rightmost end in the drawing, and then moves toward groove 133C. Button 135 reaches its maximum stroke at groove 133C (at which point the user releases his / her hand or foot), and compression spring 126 resets button 135, causing the movable end to finally stop in groove 133D as shown in FIG. In such a case, the chute 132 also moves downward, thereby moving the towing member 134 or its head (not shown) inside the chute 132, and the locking member 114 connected to the other end of the towing member 134 is pulled out of the locking groove 118A of the blocking member 111, thereby releasing the lock.

[0099] To lock the button, button 135 is pressed again to its maximum stroke (i.e., it is no longer pressed). When the user then releases his or her hand or foot, button 135 first moves the movable end of positioning member 127 from groove 133D along passage 133 to groove 133E, with the pivotally fixed end of fixing member 125 as the pivot axis, and moves traction portion 131 together with passage 133 toward holding device 110 so that button 135 reaches groove 133E in the leftmost passage 133 in the drawing. Button 135 reaches its maximum stroke at groove 133E. At this time, compression spring 126 resets button 135, causing the movable end to move to groove 133A and finally stop in groove 133A, as shown in FIG. 30 . In this case, the chute 132 also moves upward, thereby moving the towing member 134 or its head inside the chute 132, and the locking member 114 connected to the other end of the towing member 134 is inserted into the locking groove 118A of the blocking member 111, thereby locking it.

[0100] According to the above-mentioned continuous process, the present invention can easily lock and unlock the drift steering function by pressing or stepping on it twice discontinuously, making it easier for the user to operate and use.

[0101] 33 to 40 show the structure of a cart 1 according to a third embodiment of the present invention. Unlike the first and second embodiments, the unlocking member 130 and the storage mechanism 120 of the wheel steering mechanism 1 according to the third embodiment are disposed on the handlebar 300. The other components of the wheel steering mechanism 1, particularly the retaining device 110 and the cover body 140, are disposed on the wheel mechanism 400, as in the first and second embodiments. For simplicity of explanation, the structure and function of the unlocking member 130 and the storage mechanism 120 of the third embodiment will be mainly described.

[0102] 33 is a front perspective view showing a cart 1 according to a third embodiment of the present invention. As shown in the figure, the lock release member 130 and the accommodation mechanism 120 are disposed on the handle bar 300.

[0103] FIG. 34 is a rear perspective view showing a cart 1 according to a third embodiment of the present invention.

[0104] 35 is a bottom perspective view showing a cart 1 according to a third embodiment of the present invention. As shown in the figure, the tension spring 113 of the holding device 110 in this embodiment is fixed to a fixing portion 141 on the underside of the cover main body 140 instead of being fixed to the storage mechanism 120.

[0105] Figure 36 is a rear perspective view of the cart 1 according to Figure 34. As shown in the figure, the cover body 140 is removed and the locking member 114 is inserted into the protective cover 115.

[0106] Figure 37 is a rear perspective view of the cart 1 according to Figure 36. As shown in the figure, the protective cover 115 of the holding device 110 is removed, and the locking member 114 is inserted into the blocking member 111 to lock the rear wheels from drift steering.

[0107] Figure 38 is a rear perspective view of the cart 1 corresponding to Figure 37. As shown in the figure, the protective cover 115 of the holding device 110 is removed, the locking member 114 is pulled out from the blocking member 111, and the drift steering of the rear wheels is unlocked.

[0108] 39 shows a handlebar 300 according to a third embodiment of the present invention. As shown in the figure, the unlocking member 130 of the handlebar 300 is in a locked state in which the locking member 114 is inserted into the blocking member 111, the button 135 is extended to its maximum distance from the accommodating mechanism 120, and the chute 132 is in a position in which the locking member 114 connected to the other end of the towing member 134 cannot be slid out of the blocking member 111 by the towing member 134. The towing member 134 can be disposed on a hollow rod of the handlebar 300 and the frame 200.

[0109] 40 shows a handlebar 300 according to a third embodiment of the present invention. As shown in the figure, the unlocking member 130 is in an unlocked state in which the locking member 114 is pulled out from the blocking member 111, the button 135 is partially pressed into the accommodating mechanism 120, and the chute 132 formed integrally with the button 135 moves the towing member 134, thereby pulling out the locking member 114 connected to the other end of the towing member 134 from the blocking member 111, and the drift steering of the rear wheel 410 is unlocked.

[0110] According to the third embodiment, the user can easily press and control the unlocking member 130 by hand at the handlebar 300 to lock or unlock the locking member 114, and the towing member 134 can be hidden within the hollow rod, which contributes to an aesthetic appearance.

[0111] FIG. 41 shows a handlebar according to a third embodiment of the present invention, in which the unlocking member has a retention function. According to the third embodiment, the retention device 110 of the first or second embodiment may be designed to be installed on the handlebar 300, and the drift retention function of the present invention can also be realized. Specifically, for the button 135 of the unlocking member 130 shown in FIG. 39, the opening portion of the button 135 that exposes the chute 132 is schematically removed to show the chute 132 and, for example, the towing portion 131. For the structure and operation of the chute 132 and the towing portion 131, reference can be made to the specific explanations shown in FIGS. 22 and 25 (first embodiment) and FIGS. 30 and 32 (second embodiment).

[0112] The technical effect of the present invention is to provide a cart 1, particularly a stroller 1, with large rear wheels 410, and to prevent rear wheel drift, i.e., to prevent instability of the cart 1 by controlling the interlocking steering of the two rear wheels 410 within a certain range, and in this regard, embodiments of the present invention also have a drift maintenance function. Embodiments of the present invention are simple in structure and convenient in operation. The key feature of the present invention is that, when the button 135 of the unlocking member 130 is operated, the traction member 134 unlocks the locking member 114, thereby maintaining the rear wheels 410 in a driftable state.

[0113] Because the present invention can be embodied in various forms without departing from the spirit and essence of the present invention, it is to be understood that the above embodiments are not limited to the details set forth above, but should be interpreted as broadly as possible within the scope defined by the claims, and therefore all modifications that come within the scope of the claims or their equivalents should be covered by the claims. [Explanation of symbols]

[0114] 1 cart, stroller 100 Wheel steering mechanism, rear wheel steering mechanism 110 Holding device 111 Blocking member 112A First Long Groove 112B Second Slot 113 Tension spring 114 Lock Parts 115 Protective Cover 116A First protective cover hole 116B Second protective cover hole 117 Guide Rail 118A, 118B lock groove 119 U-shaped guide 120 Containment Mechanism 121 Lower cover 122 bottom cover 123 Tension spring contact point 124 Connection 125 Fixing member 126 Compression spring 127 Positioning member 128 Storage Unit 129A, 129B Horizontal slots 130 Lock release member 131 Traction section 132 shots 133 Passage section 133A, 133B, 133C, 133D, 133E Groove 134 Traction parts 135 Button 140 Lid 141 Fixed part 150 Crossbar 151 Through hole 152A First guide post 152B Second guide post 160 Interlocking parts 200 frames 210 Wheel seat 211 Pivot point 300 Handlebar 400 wheel mechanism 410 Wheels, front and rear 420 Fixed seat 421 Connection 422 Pivot point 423 Notch

Claims

1. A wheel steering mechanism (100) for steering a wheel mechanism (400) of a cart (1), comprising: a linkage member (160) for linking and steering a pair of wheel mechanisms (400) of the cart (1); a crossbar (150) for connecting two wheel seats (210) of the cart (1), each of the wheel seats (210) being pivotally connected to the wheel mechanism (400); A wheel steering mechanism (100) characterized by comprising a holding device (110) arranged between the interlocking member (160) and the crossbar (150) for holding the pair of wheel mechanisms (400) so that they can be steered together.

2. The wheel steering mechanism (100) according to claim 1, characterized in that the holding device (110) is provided with a locking member (114) for locking the wheel mechanism (400) in a forward direction, and after the locking member (114) is unlocked, the wheel mechanism (400) can be steered in an interlocking manner.

3. The wheel steering mechanism (100) according to claim 2, characterized in that the holding device (110) comprises a guide rail (117) for holding and guiding the locking member (114).

4. The wheel steering mechanism (100) according to claim 2, characterized in that the holding device (110) comprises a blocking member (111), the blocking member (111) being arranged between the interlocking member (160) and the crossbar (150).

5. The wheel steering mechanism (100) of claim 4, characterized in that when the wheel mechanism (400) is in the forward direction, the locking member (114) is insertable into the blocking member (111) to lock the wheel mechanism (400) in the forward direction.

6. The wheel steering mechanism (100) according to claim 5, characterized in that the blocking member (111) has a locking groove (118A), and the locking member (114) is insertable into the locking groove (118A).

7. The wheel steering mechanism (100) according to claim 5, characterized in that it is provided with an unlocking member (130) for unlocking the locking member (114) from the blocking member (111) so that the wheel mechanism (400) can be steered in conjunction.

8. The wheel steering mechanism (100) according to claim 7, characterized in that the unlocking member (130) unlocks the locking member (114) and the blocking member (111) via a pulling member (134).

9. The wheel steering mechanism (100) of claim 8, characterized in that the unlocking member (130) is arranged within a storage mechanism (120), and the storage mechanism (120) is fixed to the underside of a cover body (140) that covers the wheel steering mechanism (100).

10. The wheel steering mechanism (100) of claim 9, characterized in that the blocking member (111) is connected to the storage mechanism (120) or the cover body (140) via a tension spring, and when the wheel mechanism (400) returns to the forward direction, the blocking member (111) can move away from the crossbar (150) together with the interlocking member (160).

11. The wheel steering mechanism (100) according to claim 8, characterized in that the unlocking member (130) is arranged in a storage mechanism (120), and the storage mechanism (120) is fixed to a handlebar (300) of the cart (1).

12. The wheel steering mechanism (100) of claim 11, characterized in that the blocking member (111) is connected to a fixed portion (141) arranged on the underside of the cover body (140) of the wheel steering mechanism (100) via a tension spring (113), and when the wheel mechanism (400) returns to the forward direction, the blocking member (111) can move away from the crossbar (150) together with the connecting member (160).

13. The wheel steering mechanism (100) of claim 10 or 12, characterized in that the blocking member (111) has a first long groove (112A), the crossbar (150) has a through hole (151), and a first guide post (152A) passes through the first long groove (112A) and the through hole (151), so that the blocking member (111) is movable relative to the crossbar (150).

14. The wheel steering mechanism (100) according to claim 13, characterized in that the blocking member (111) has a U-shaped guide portion (119) connected to the crossbar (150), and the U-shaped guide portion (119) has two first long slots (112A) parallel to the tension direction of the tension spring (113).

15. The wheel steering mechanism (100) of claim 13, characterized in that the holding device (110) includes a protective cover (115) for covering the blocking member (111), the protective cover (115) includes a first protective cover hole (116A), and the first guide post (152A) is inserted into the first protective cover hole (116A).

16. 16. The wheel steering mechanism (100) of claim 15, wherein the protective cover (115) has a second protective cover hole (116B) on the opposite side of the interlocking member (160) from the crossbar (150), and the second protective cover hole (116B) and the second long groove (112B) of the blocking member (111) are used to receive the second guide post (152B).

17. The wheel steering mechanism (100) according to claim 15, characterized in that a guide rail (117) is arranged on the protective cover (115), and the locking member (114) is operatively arranged on the guide rail (117) to lock or unlock the blocking member (111).

18. The wheel steering mechanism (100) according to any one of claims 9 to 12, characterized in that the unlocking member (130) comprises a traction portion (131), and the traction member (134) is pulled by movement of the traction portion (131) within a chute (132) of the traction portion (131), thereby unlocking the locking member (114) from the preventing member (111).

19. The receiving mechanism (120) a bottom cover (122) and a lower cover (121) for enclosing an accommodation space for accommodating the unlocking member (130); 19. The wheel steering mechanism (100) according to claim 18, further comprising: a positioning member (127) disposed in the storage space for positioning the unlocking member (130) at different positions so as to move the traction portion (131).

20. The receiving mechanism (120) a compression spring (126) supported between the button (135) of the unlocking member (130) and the bottom of the receiving mechanism (120); a fixing member (125) for fixing the positioning member (127) at the bottom end of the receiving mechanism (120) and for supporting the compression spring (126); The wheel steering mechanism (100) of claim 19, characterized in that the compression spring (126) allows the other end of the positioning member (127) to be positioned in a plurality of grooves (133A, 133B, 133C, 133D, 133E) of the unlocking member (130).

21. The wheel steering mechanism (100) of any one of claims 1 to 12, characterized in that the wheel mechanism (400) comprises a fixed seat (420) pivotally connected to the wheel seat (210) via a connection portion (421), and the connection portion (421) is pivotally connected to the interlocking member (160) so that the pair of wheel mechanisms (400) move synchronously when steering.

22. The wheel steering mechanism (100) according to any one of claims 1 to 12, characterized in that the angle range of the left steering or right steering of the wheel mechanism (400) is 30° to 40°.

23. The wheel steering mechanism (100) according to any one of claims 1 to 12, characterized in that the wheel steering mechanism (100) is a rear wheel steering mechanism.

24. A cart (1) comprising a wheel steering mechanism (100) according to any one of claims 1 to 23.

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