A foot brake structure and a trolley with the same

Abstract

A foot brake structure and a storage cart with the same, the foot brake structure comprising: a mounting seat; a foot brake member for connecting an external brake wire, the foot brake member being constrained to the mounting seat and having a foot pedal movable up and down relative to the mounting seat, the foot pedal always having a tendency to move up to an initial position under the action of the brake wire; the foot pedal being movable down to a first position below the initial position and a second position below the first position under the action of an external force; further comprising: a locking member acting on the foot brake member and being switched from an unlocked state to a locked state in which the foot brake member is locked to avoid the movement of the foot pedal when the foot pedal moves from the initial position to the first position; the locking member being switched from the locked state to the unlocked state when the foot pedal moves from the first position to the second position, so that the foot pedal at the second position can move up to the initial position under the action of the brake wire. The foot brake structure is convenient to switch between locking and unlocking.

Description

Technical Field

[0001] This utility model belongs to the technical field of walking carts, specifically relating to a foot brake structure and a storage cart having the foot brake structure. Background Technology

[0002] Existing strollers are usually equipped with a foot brake mechanism. When the stroller is not moving forward, the foot brake mechanism can brake the wheels of the stroller to prevent the stroller from moving accidentally. When it is necessary to move the stroller, the foot brake mechanism can be unlocked to release the braking of the wheels.

[0003] The locking and unlocking operation of existing foot brake structures generally requires multiple actions from the user, such as pressing down the foot brake to lock and releasing the foot brake to unlock, or pressing the foot brake forward to lock and pressing the foot brake backward to unlock, etc., which requires at least two actions and is inconvenient to operate.

[0004] Specifically, as illustrated by the Chinese utility model patent application number 202420659435.6, "Braking Device for a Trolley and Trolley" (authorization announcement number CN221852014U), when the braking device is in the unlocked state, pressing the brake pedal towards the rear wheel causes the brake pedal to rotate relative to the brake lever. At this time, the cable is released, and the brake pin slides towards the wheel under the action of the first elastic element and engages in any brake groove. Simultaneously, the boss of the sliding block engages in the second groove, thus completing the braking action. When pressing the brake pedal towards the front wheel, the brake pedal rotates relative to the brake lever. At this time, the cable is tightened, and the brake pin slides away from the wheel under the tension of the cable and disengages from the brake groove. Simultaneously, the boss of the sliding block engages in the first groove, thus completing the unlocking action. Utility Model Content

[0005] The first technical problem to be solved by this utility model is to provide a foot brake structure that facilitates switching between locking and unlocking, in light of the current state of the technology.

[0006] The second technical problem to be solved by this utility model is to provide a storage vehicle with the above-mentioned foot brake structure.

[0007] The technical solution adopted by this utility model to solve the first technical problem mentioned above is: a foot brake structure, comprising:

[0008] Mounting base;

[0009] A foot brake assembly for connecting an external brake cable, the foot brake assembly being constrained by the mounting base and having a foot pedal that can move up and down relative to the mounting base, the foot pedal always having a tendency to move upward to the initial position under the action of the brake cable;

[0010] Its features are:

[0011] Under the action of external force, the foot pedal can move downward to a first position below the initial position and a second position below the first position;

[0012] It also includes:

[0013] A locking element acts on the foot brake component, and when the foot pedal moves from the initial position to the first position, the locking element switches from the unlocked state to the locked state that locks the foot brake component to prevent the foot pedal from moving; when the foot pedal moves from the first position to the second position, the locking element switches from the locked state to the unlocked state, so that the foot pedal in the second position can move upward to the initial position under the action of the brake cable.

[0014] In this invention, the locking component and the foot brake component work together to allow switching between the locked and unlocked states with a single action of stepping on the foot pedal, making it easy to operate.

[0015] Preferably, the locking element is arranged to switch states under the drive of a downwardly moving foot pedal.

[0016] Preferably, the foot brake component further includes a rotating cylinder connected to the foot pedal. The rotating cylinder is rotatably disposed on the mounting base about a first axis that extends left and right about its center, and can rotate in a first direction clockwise or counterclockwise as the foot pedal moves downward, and in a second direction opposite to the first direction as the foot pedal moves upward.

[0017] The side wall of the rotating drum is provided with a limiting groove, and the corresponding locking member has a limiting protrusion;

[0018] When the foot pedal moves from the initial position to the first position, the limiting protrusion inserts into the limiting groove to prevent the rotating drum from rotating;

[0019] When the foot pedal moves from the first position to the second position, the limiting protrusion disengages from the limiting groove.

[0020] Furthermore, the locking element includes:

[0021] A locking arm is provided corresponding to the side wall of the rotating drum. The first end of the locking arm is a free end, and the second end of the locking arm or a position adjacent to the second end is rotatably connected to the mounting base through a first rotating shaft extending to the left and right, so that the locking arm can rotate relative to the side wall of the rotating drum; and the first end of the locking arm or a position adjacent to the first end is provided with the aforementioned limiting protrusion.

[0022] A blocking arm is provided corresponding to the side wall of the rotating drum. The head end of the blocking arm is a free end, and the tail end or the position near the tail end of the blocking arm is rotatably connected to the mounting base through a second rotating shaft extending to the left and right, so that the blocking arm can rotate relative to the side wall of the rotating drum.

[0023] An elastic element, the first end of which is constrained to the first end of the locking arm, and the second end of which is constrained to the head end of the blocking arm;

[0024] The side wall of the rotating drum is provided with a stop block that cooperates with the blocking arm;

[0025] When the foot pedal is in the initial position, the first end of the locking arm tends to rotate closer to the side wall of the rotating cylinder under the action of the elastic element, and the limiting protrusion on the locking arm is located above the limiting groove of the rotating cylinder and contacts the side wall of the rotating cylinder. The head end of the blocking arm tends to rotate away from the side wall of the rotating cylinder to the normal position under the action of the elastic element.

[0026] When the foot pedal moves from the initial position to the first position, the first end of the locking arm rotates further closer to the side wall of the rotating cylinder under the action of the elastic element, so that the limiting protrusion on the locking arm is inserted into the limiting groove of the rotating cylinder. The head end of the blocking arm rotates closer to the side wall of the rotating cylinder under the action of the first end of the locking arm and the elastic element, and contacts the stop block to prevent the rotating cylinder from rotating in the second direction.

[0027] When the foot pedal moves from the first position to the second position, the limiting protrusion on the locking arm disengages from the limiting groove of the rotating cylinder, causing the first end of the locking arm to rotate away from the side wall of the rotating cylinder. The head end of the blocking arm disengages from the stop block and rotates close to the side wall of the rotating cylinder under the action of the elastic member, and contacts the side wall of the rotating cylinder. At this time, the first end of the locking arm always has a tendency to rotate away from the side wall of the rotating cylinder under the action of the elastic member.

[0028] When the foot pedal moves from the second position to the initial position, the head end of the blocking arm rotates away from the side wall of the rotating cylinder under the action of the stop block to the normal position. At this time, the first end of the locking arm always tends to rotate closer to the side wall of the rotating cylinder under the action of the elastic element.

[0029] In this invention, the structural design of the locking component allows switching between the locked and unlocked states to be achieved by stepping on the foot pedal, while ensuring the stability of the overall structure in the locked state.

[0030] Furthermore, the surface of the stop block that contacts the head end of the blocking arm is a first inclined surface, which protrudes relative to the side wall of the rotating drum and smoothly connects with the side wall of the rotating drum.

[0031] The surface at the head end of the blocking arm that contacts the first inclined surface is the second inclined surface.

[0032] Preferably, the locking arm is provided with a strip-shaped hole for the first rotating shaft to pass through and extending along the length direction of the locking arm, one end of the strip-shaped hole is relatively close to the second end of the locking arm, and the other end of the strip-shaped hole is relatively far away from the second end of the locking arm;

[0033] When the foot pedal moves from the initial position to the first position, the first pivot moves from one end of the strip hole to the other end of the strip hole.

[0034] When the foot pedal moves from the first position to the second position, the first pivot is still at the other end of the strip hole;

[0035] When the foot pedal moves from the second position to the initial position, the first pivot moves from the other end of the strip hole to one end of the strip hole.

[0036] The slotted hole mates with the first rotating shaft, ensuring smooth rotation of the locking arm while also facilitating the insertion of the limiting protrusion on the locking arm into the upper limit groove of the rotating drum when locked, and ensuring the stability of the overall structure when overfitting.

[0037] Furthermore, the elastic element is a torsion spring, and the first and second ends of the torsion spring tend to open towards each other. The design of the elastic element in this invention makes it possible for the locking element to switch between various states, and the structure of the elastic element is simple and easy to implement.

[0038] Furthermore, the limiting protrusion is triangular with its tip pointing towards the side wall of the rotating cylinder, and the limiting groove is triangular in shape matching the limiting protrusion. The cooperation between the triangular limiting protrusion and the limiting groove facilitates the movement of the limiting protrusion into and out of the limiting groove.

[0039] In the above embodiments, preferably, the first rotating shaft is disposed near the second end of the locking arm such that the second end of the locking arm is a free end that can rotate around the first rotating shaft;

[0040] The tail end of the blocking arm is formed with a hook portion for the second end of the locking arm to be inserted into the hook portion.

[0041] The technical solution adopted by this utility model to solve the second technical problem mentioned above is: a storage cart, including a vehicle body with wheels at the bottom, characterized in that it also has a foot brake structure as described above, the mounting seat is fixed relative to the vehicle body, and the foot brake acts on the wheels through a brake cable.

[0042] Compared with the prior art, the advantages of this utility model are: the cooperation between the locking component and the foot brake component in this utility model allows switching between the locked and unlocked states by a single action of stepping on the foot pedal, which is convenient for operation. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the foot brake structure according to an embodiment of the present invention (foot pedal in the initial position);

[0044] Figure 2 for Figure 1 A partial structural diagram of the center foot brake structure;

[0045] Figure 3 for Figure 2 3D exploded view of the center foot brake structure;

[0046] Figure 4 This is a schematic diagram of the foot brake structure according to an embodiment of the present invention (foot pedal in the initial position);

[0047] Figure 5 This is a schematic diagram of the foot brake structure according to an embodiment of the present invention (the foot pedal is in the first position);

[0048] Figure 6 This is a schematic diagram of the foot brake structure according to an embodiment of the present invention (the foot pedal is in the second position);

[0049] Figure 7 This is a schematic diagram of the foot brake structure according to an embodiment of the present invention (the foot pedal moves upward from the second position to the initial position);

[0050] Figure 8 This is a schematic diagram of the foot brake structure according to an embodiment of the present invention (foot pedal returned to its initial position);

[0051] Figure 9 This is a schematic diagram of the structure of the storage cart according to an embodiment of the present utility model. Detailed Implementation

[0052] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0053] like Figures 1-9 As shown, this is a preferred embodiment of a foot brake structure of the present invention and a storage vehicle having the foot brake structure. The foot brake structure includes a mounting base 1, a foot brake component 2, and a locking component 3.

[0054] Mounting base 1 is a hollow shell structure, consisting of two half-shells joined together.

[0055] The foot brake component 2 is used to connect to an external brake cable. The foot brake component 2 is constrained outside the mounting base 1 and has a foot pedal 21 that can move up and down relative to the mounting base 1. Under the action of the brake cable, the foot pedal 21 always has the ability to move upwards to its initial position (e.g., ...). Figures 1-4 The foot pedal 21 moves downward to a first position below the initial position under the action of an external force (as shown in the figure). Figure 5 As shown), the second position located below the first position (as shown) Figure 6 (As shown). The foot brake component 2 also has a rotating cylinder 22 connected to the foot pedal 21. The rotating cylinder 22 is rotatably disposed in the mounting base 1 with a first axis 220 extending left and right about its center. It can rotate in a first direction of clockwise or counterclockwise as the foot pedal 21 moves downward, and in a second direction opposite to the first direction as the foot pedal 21 moves upward.

[0056] The locking member 3 acts on the foot brake member 2, and when the foot pedal 21 moves from the initial position to the first position, the locking member 3 switches from the unlocked state to the locked state that locks the foot brake member 2 to prevent the foot pedal 21 from moving; when the foot pedal 21 moves from the first position to the second position, the locking member 3 switches from the locked state to the unlocked state, so that the foot pedal 21 in the second position can move upward to the initial position under the action of the brake cable.

[0057] In this embodiment, the locking member 3 is arranged to switch states under the drive of the downwardly moving foot pedal 21: the side wall of the rotating cylinder 22 is provided with a limiting groove 221, and correspondingly, the locking member 3 has a limiting protrusion 310. When the foot pedal 21 moves from the initial position to the first position, the limiting protrusion 310 inserts into the limiting groove 221 to prevent the rotating cylinder 22 from rotating; when the foot pedal 21 moves from the first position to the second position, the limiting protrusion 310 disengages from the limiting groove 221. Specifically:

[0058] The locking element 3 includes a locking arm 31, a blocking arm 32, and an elastic element 33.

[0059] The locking arm 31 is disposed on the side wall of the rotating cylinder 22. The first end 311 of the locking arm 31 is a free end. The locking arm 31 is rotatably connected to the mounting base 1 via a first rotating shaft 313 extending left and right, adjacent to its second end 312, so that the locking arm 31 can rotate relative to the side wall of the rotating cylinder 22. The second end 312 of the locking arm 31 is a free end that can rotate around the first rotating shaft 313. The locking arm 31 is provided with the aforementioned limiting protrusion 310 near its first end 311, and the limiting protrusion 310 is triangular with its tip pointing towards the side wall of the rotating cylinder 22. Correspondingly, the limiting groove 221 is triangular in shape matching the limiting protrusion 310. At the same time, the locking arm 31 is provided with a strip-shaped hole 314 for the first rotating shaft 313 to pass through and extending along the length direction of the locking arm 31. One end of the strip-shaped hole 314 is relatively close to the second end 312 of the locking arm 31, and the other end of the strip-shaped hole 314 is relatively far away from the second end 312 of the locking arm 31.

[0060] The blocking arm 32 is disposed on the side wall of the rotating drum 22. The head end 321 of the blocking arm 32 is a free end, and the tail end or a position near the tail end of the blocking arm 32 is rotatably connected to the mounting base 1 via a second rotating shaft 322 extending left and right, so that the blocking arm 32 can rotate relative to the side wall of the rotating drum 22. The tail end of the blocking arm 32 forms a hook portion 323 for the second end 312 of the locking arm 31 to be inserted into the hook portion. A stop block 222 that cooperates with the blocking arm 32 is protruding on the side wall of the rotating drum 22. The surface of the stop block 222 that contacts the head end 321 of the blocking arm 32 is a first inclined surface 2221. The first inclined surface 2221 protrudes relative to the side wall of the rotating drum 22 and smoothly connects with the side wall of the rotating drum 22. The surface of the head end 321 of the blocking arm 32 that contacts the first inclined surface 2221 is a second inclined surface 3211.

[0061] The elastic element 33 is a torsion spring. The first end and the second end of the torsion spring tend to open up towards each other. The first end of the torsion spring is inserted into the hole of the first end 311 of the locking arm 31 in the left-right direction, and the second end of the torsion spring is inserted into the hole of the head end 321 of the blocking arm 32 in the left-right direction, so that the position of the elastic element 33 can change with the rotation of the locking arm 31 and the blocking arm 32.

[0062] When the foot pedal 21 is in the initial position, the first end 311 of the locking arm 31 tends to rotate closer to the side wall of the rotating cylinder 22 under the action of the elastic member 33, and the limiting protrusion 310 on the locking arm 31 is located above the limiting groove 221 of the rotating cylinder 22 and contacts the side wall of the rotating cylinder 22. The head end 321 of the blocking arm 32 tends to rotate away from the side wall of the rotating cylinder 22 to the normal position under the action of the elastic member 33. In the normal position, the head end 321 of the blocking arm 32 contacts the limiting block 11 in the mounting base 1. The limiting block 11 can prevent the head end of the blocking arm 32 from rotating further away from the side wall of the rotating cylinder 22.

[0063] When the foot pedal 21 moves from the initial position to the first position, the first end 311 of the locking arm 31 rotates further closer to the side wall of the rotating cylinder 22 under the action of the elastic member 33, so that the limiting protrusion 310 on the locking arm 31 is inserted into the limiting groove 221 of the rotating cylinder 22. The first rotating shaft 313 moves from one end of the strip hole 314 to the other end of the strip hole 314. The head end 321 of the blocking arm 32 rotates closer to the side wall of the rotating cylinder 22 under the action of the first end 311 of the locking arm 31 and the elastic member 33, and contacts the stop block 222 to prevent the rotating cylinder 22 from rotating in the second direction.

[0064] When the foot pedal 21 moves from the first position to the second position, the limiting protrusion 310 on the locking arm 31 disengages from the limiting groove 221 of the rotating cylinder 22, causing the first end 311 of the locking arm 31 to rotate away from the side wall of the rotating cylinder 22. The first rotating shaft 313 is still at the other end of the strip hole 314. The head end 321 of the blocking arm 32 disengages from the stop block 222 and rotates close to the side wall of the rotating cylinder 22 under the action of the elastic member 33, and contacts the side wall of the rotating cylinder 22. At this time, the first end 311 of the locking arm 31 always has a tendency to rotate away from the side wall of the rotating cylinder 22 under the action of the elastic member 33.

[0065] When the foot pedal 21 moves from the second position to the initial position, the head end 321 of the blocking arm 32 rotates away from the side wall of the rotating cylinder 22 under the action of the stop block 222 to the normal position. At this time, the first end 311 of the locking arm 31 always tends to rotate close to the side wall of the rotating cylinder 22 under the action of the elastic member 33. The first rotating shaft 313 moves from the other end of the strip hole 314 to one end of the strip hole 314.

[0066] Therefore, in this embodiment, the locking member can be switched between the locked and unlocked states by a single action of stepping on the foot pedal 21:

[0067] like Figure 5As shown, when the foot pedal 21 is first pressed down in its initial position, the limiting groove 221 on the rotating cylinder 22, after rotation, will precisely engage with the limiting protrusion 310 on the locking arm 31, which has been pressed down. If the foot is lifted to release the foot pedal 21, the foot pedal 21 will move upward under the pull of the external brake cable. At the same time, the limiting groove 221 on the rotating cylinder 22 will press down on the limiting protrusion 310. After a slight downward press, the limiting protrusion 310 will drive the second end of the locking arm 31 to rotate upward until the second inclined surface 3211 on the blocking arm 32 contacts the first inclined surface 2221 on the rotating cylinder 22 (when the second inclined surface 3211 on the blocking arm 32 contacts the first inclined surface 2221 on the rotating cylinder 22, the torque on the blocking arm 32 is basically zero, which can prevent the blocking arm 32 from rotating accidentally), thus preventing the foot pedal 21 from moving further upward. In terms of sensation, when the foot pedal 21 is released, the foot pedal 21 will lock itself at a fixed angle. This angle difference will cause the locking pin on the external brake line to lock.

[0068] To release the brake, simply press the pedal down to the second position at the bottom, such as... Figure 6 As shown, at this time, the limiting groove 221 on the rotating drum 22 will lift the first end 311 of the locking arm 31 by a certain angle under the action of the inclined plane (i.e., the hypotenuse of the triangle). At the same time, the head end 321 of the blocking arm 32 is pressed down against the side wall of the rotating drum 22 under the action of the torsion spring, and the angle of the blocking arm 32 does not change much. When the first end 311 of the locking arm 31 rotates upward to a certain angle, the torsion spring just passes through a dead point. At this time, under the action of the torsion spring, the first end 311 of the locking arm 31 moves from its original downward rotation (as shown in the image). Figure 6 The clockwise rotation direction changes to the first state of counterclockwise rotation release.

[0069] In the first state described above, the limiting protrusion 310 on the locking arm 31 is lifted. At this time, after the external force applied to the foot pedal 21 is released, the foot pedal 21 moves upward and the rotating cylinder moves in the second direction ( Figure 7 The drum 22 rotates counterclockwise. During rotation, the limiting protrusion 310 is lifted, so it will not enter the limiting groove 221. When the drum 22 rotates to a certain angle, the first inclined surface 2221 on the drum 22 will press against the second inclined surface 3211 at the head of the blocking arm 32, causing the blocking arm 32 to rotate counterclockwise. Here, the tension of the foot pedal 21 under the external brake cable is much greater than the elastic force of the torsion spring, so it can successfully press the blocking arm 32 to rotate counterclockwise back to its original normal position.

[0070] like Figure 8 As shown, when the blocking arm 32 rotates counterclockwise to the normal position, the torsion spring transitions to the second dead point and re-presses the locking arm 31 to rotate clockwise and rest on the side wall of the rotating drum.

[0071] like Figure 9 As shown, the storage cart in this embodiment includes a vehicle body 4 with wheels 40 at the bottom and the aforementioned foot brake structure. The vehicle body 4 and wheels 40 can be designed with reference to existing technology, and will not be described in detail here. The mounting base 1 is fixed relative to the vehicle body 4, and the foot brake 2 acts on the wheels 40 through a brake cable. The cooperation between the brake cable and the wheels 40 is also existing technology, and will not be described in detail here.

[0072] In the specification and claims of this utility model, terms indicating direction, such as "front," "rear," "upper," "lower," "left," "right," "side," "top," and "bottom," are used to describe various exemplary structural parts and elements of this utility model. However, the use of these terms is merely for the purpose of explanation and is based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this utility model can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

Claims

1. A foot brake structure, comprising: Mounting base (1); A foot brake component (2) for connecting an external brake cable, the foot brake component (2) being constrained to the mounting base (1) and having a foot pedal (21) that can move up and down relative to the mounting base (1), the foot pedal (21) always having a tendency to move upward to the initial position under the action of the brake cable; Its features are: The foot pedal (21) can move downward to a first position below the initial position and a second position below the first position under the action of external force; It also includes: The locking member (3) acts on the foot brake member (2), and when the foot pedal (21) moves from the initial position to the first position, the locking member (3) switches from the unlocked state to the locked state that locks the foot brake member (2) to prevent the foot pedal (21) from moving; when the foot pedal (21) moves from the first position to the second position, the locking member (3) switches from the locked state to the unlocked state, so that the foot pedal (21) in the second position can move upward to the initial position under the action of the brake cable.

2. The foot brake structure according to claim 1, characterized in that: The locking element (3) is arranged to switch states under the drive of the downwardly moving foot pedal (21).

3. The foot brake structure according to claim 2, characterized in that: The foot brake component (2) also has a rotating cylinder (22) connected to the foot pedal (21). The rotating cylinder (22) is rotatably mounted on the mounting base (1) about a first axis (220) that extends left and right around its center. It can rotate clockwise or counterclockwise in a first direction as the foot pedal (21) moves downward, and rotate in a second direction opposite to the first direction as the foot pedal (21) moves upward. The side wall of the rotating drum (22) is provided with a limiting groove (221), and the corresponding locking member (3) has a limiting protrusion (310); When the foot pedal (21) moves from the initial position to the first position, the limiting protrusion (310) is inserted into the limiting groove (221) to prevent the rotating drum (22) from rotating; When the foot pedal (21) moves from the first position to the second position, the limiting protrusion (310) disengages from the limiting groove (221).

4. The foot brake structure according to claim 3, characterized in that: The locking element (3) includes: A locking arm (31) is provided corresponding to the side wall of the rotating cylinder (22). The first end (311) of the locking arm (31) is a free end. The second end (312) of the locking arm (31) or the position adjacent to the second end (312) is rotatably connected to the mounting base (1) through a left-right extending first rotating shaft (313), so that the locking arm (31) can rotate relative to the side wall of the rotating cylinder (22); and the first end (311) of the locking arm (31) or the position adjacent to the first end (311) is provided with the aforementioned limiting protrusion (310); A blocking arm (32) is provided corresponding to the side wall of the rotating drum (22). The head end (321) of the blocking arm (32) is a free end. The tail end or the position near the tail end of the blocking arm (32) is rotatably connected to the mounting base (1) through a second rotating shaft (322) extending to the left and right, so that the blocking arm (32) can rotate relative to the side wall of the rotating drum (22). The elastic element (33) has its first end constrained to the first end (311) of the locking arm (31) and its second end constrained to the head end (321) of the blocking arm (32). The side wall of the rotating drum (22) is provided with a stop block (222) that cooperates with the stop arm (32); When the foot pedal (21) is in the initial position, the first end (311) of the locking arm (31) tends to rotate closer to the side wall of the rotating cylinder (22) under the action of the elastic member (33), and the limiting protrusion (310) on the locking arm (31) is located above the limiting groove (221) of the rotating cylinder (22) and contacts the side wall of the rotating cylinder (22). The head end (321) of the blocking arm (32) tends to rotate away from the side wall of the rotating cylinder (22) to the normal position under the action of the elastic member (33). When the foot pedal (21) moves from the initial position to the first position, the first end (311) of the locking arm (31) rotates further closer to the side wall of the rotating cylinder (22) under the action of the elastic member (33), so that the limiting protrusion (310) on the locking arm (31) is inserted into the limiting groove (221) of the rotating cylinder (22), and the head end (321) of the blocking arm (32) rotates closer to the side wall of the rotating cylinder (22) under the action of the first end (311) of the locking arm (31) and the elastic member (33) and contacts the stop block (222) to prevent the rotating cylinder (22) from rotating in the second direction; When the foot pedal (21) moves from the first position to the second position, the limiting protrusion (310) on the locking arm (31) disengages from the limiting groove (221) of the rotating cylinder (22), causing the first end (311) of the locking arm (31) to rotate away from the side wall of the rotating cylinder (22). The head end (321) of the blocking arm (32) disengages from the stop block (222) and rotates close to the side wall of the rotating cylinder (22) under the action of the elastic member (33) and contacts the side wall of the rotating cylinder (22). At this time, the first end (311) of the locking arm (31) always tends to rotate away from the side wall of the rotating cylinder (22) under the action of the elastic member (33). When the foot pedal (21) moves from the second position to the initial position, the head end (321) of the blocking arm (32) rotates away from the side wall of the rotating cylinder (22) to the normal position under the action of the stop block (222). At this time, the first end (311) of the locking arm (31) always tends to rotate closer to the side wall of the rotating cylinder (22) under the action of the elastic member (33).

5. The foot brake structure according to claim 4, characterized in that: The surface of the stop block (222) that contacts the head end (321) of the blocking arm (32) is a first inclined surface (2221), which protrudes from the side wall of the rotating cylinder (22) and smoothly connects with the side wall of the rotating cylinder (22). The surface of the head end (321) of the blocking arm (32) that is in contact with the first inclined surface (2221) is the second inclined surface (3211).

6. The foot brake structure according to claim 4, characterized in that: The locking arm (31) is provided with a strip-shaped hole (314) through which the first rotating shaft (313) passes and extends along the length direction of the locking arm (31). One end of the strip-shaped hole (314) is relatively close to the second end (312) of the locking arm (31), and the other end of the strip-shaped hole (314) is relatively far away from the second end (312) of the locking arm (31). When the foot pedal (21) moves from the initial position to the first position, the first pivot (313) moves from one end of the strip hole (314) to the other end of the strip hole (314); When the foot pedal (21) moves from the first position to the second position, the first pivot (313) is still at the other end of the strip hole (314); When the foot pedal (21) moves from the second position to the initial position, the first pivot (313) moves from the other end of the strip hole (314) to one end of the strip hole (314).

7. The foot brake structure according to claim 4, characterized in that: The elastic element (33) is a torsion spring, and the first and second ends of the torsion spring tend to open towards each other.

8. The foot brake structure according to claim 3, characterized in that: The limiting protrusion (310) is triangular with its tip pointing toward the side wall of the rotating cylinder (22), and the limiting groove (221) is triangular with a shape matching that of the limiting protrusion (310).

9. The foot brake structure according to any one of claims 4 to 7, characterized in that: The first pivot (313) is disposed near the second end (312) of the locking arm (31) such that the second end (312) of the locking arm (31) is a free end that can rotate around the first pivot (313); The tail end of the blocking arm (32) is formed with a hook (323) for the second end (312) of the locking arm (31) to be inserted into the hook.

10. A storage cart, comprising a vehicle body (4) with wheels (40) at the bottom, characterized in that... It also has a foot brake structure as described in any one of claims 1 to 9, wherein the mounting base (1) is fixed relative to the vehicle body (4), and the foot brake component (2) acts on the driving wheel (40) through a brake cable.

Images