Pedal adjusting mechanism

Abstract

The utility model provides a pedal adjusting mechanism. The pedal adjusting mechanism comprises a fixed end connected with a seat, a pedal arm and a movable meshing piece, wherein a rotating end at the upper end of the pedal arm is rotationally connected with the fixed end; one end of the movable meshing piece is slidably arranged at the fixed end, and the other end of the movable meshing piece is provided with a pawl and the rotating end to form a ratchet mechanism with the rotating end rotating upwards in one direction for gear shifting. The device further comprises a rotary unlocking piece. One end of the rotary unlocking piece is rotationally arranged in the rotary end, a preset relative rotation angle exists between the rotary end and the rotary end, and the other end of the rotary unlocking piece is provided with a deep locking groove and a shallow unlocking groove; a locking tooth matched with any one of the locking groove or the unlocking piece is arranged on the movable meshing piece; after the rotating end rotates to the position where the rotating unlocking piece is driven to rotate, the rotating unlocking piece rotates so that the locking teeth can be switched between the locking groove and the unlocking groove, and switching between gear shifting and unlocking of the movable meshing piece and the rotating end is achieved.

Description

Technical Field

[0001] This utility model belongs to the field of children's strollers, and specifically relates to a foot pedal adjustment mechanism. Background Technology

[0002] A stroller includes a frame, on which a seat with a backrest is mounted. A footrest is located at the lower end of the seat to prevent injury to the child's legs and feet. The footrest needs to maintain its position when subjected to downward force from the child and also requires an angle adjustment mechanism to adjust to different angles. Patent prior art CN211252741U discloses a footrest tube joint structure, a seat assembly, and a stroller. When rotated downwards, the footrest remains stationary. When rotated upwards, several adjustment positions are available. To adjust the angle downwards, the footrest needs to be rotated upwards to the unlocked position. After unlocking, the footrest can freely fall to a lower position, and then the adjustment position can be readjusted upwards. However, the structure of the aforementioned patent also has some problems. First, the blocking block 313 of the clutch 31 is located radially, i.e., on the circumferential surface, which increases the diameter of the already relatively thick rotating tube. Second, during adjustment, the clutch 31 rotates with the rotating arm 1; in the final unlocking step, the clutch 31 does not rotate but moves axially with the 2nd arm. In other words, the clutch both moves and rotates, making it more prone to damage. A smaller, less prone-to-damage foot pedal adjustment mechanism is needed. Summary of the Invention

[0003] This utility model provides a foot pedal adjustment mechanism.

[0004] The purpose of this utility model is achieved in the following manner: a foot pedal adjustment mechanism includes a fixed end connected to a seat, a foot pedal arm with its lower end fixedly connected to the foot pedal and its upper left and right rotating ends respectively rotatably connected to the fixed end on the corresponding side, and a movable engaging member that can only move axially; one end of the movable engaging member is slidably disposed on the fixed end, and the other end is provided with a pawl, which together with the rotating end forms a ratchet mechanism for unidirectional upward rotation adjustment; the movable engaging member is subjected to an elastic force from an elastic member that moves towards the rotating end; it also includes a rotating unlocking member; one end of the rotating unlocking member is rotatably disposed in the rotating end and the two have a predetermined relative rotation angle, and the other end of the rotating unlocking member is provided with a deeper locking groove and a shallower unlocking groove; the movable engaging member is provided with a locking tooth that engages with either the locking groove or the unlocking member; after the rotating end rotates to a position that drives the rotating unlocking member to rotate: the rotating unlocking member rotates so that the locking tooth switches between the locking groove and the unlocking groove, realizing the switching between adjustment and unlocking of the movable engaging member and the rotating end.

[0005] The rotating unlocking component and the rotating end are connected by a sliding groove slider mechanism to achieve a predetermined relative rotation angle: wherein the end face of the rotating unlocking component is provided with a protrusion, and the cavity of the rotating end is provided with a sliding groove corresponding to the protrusion with an angle not less than the sum of the angles corresponding to the protrusion and the distance between the centers of at least two ratchet teeth.

[0006] The rotating end cavity is provided with several gear teeth along the circumference. The moving engagement member is a hollow cylindrical shape. The outer surface of the moving engagement member is provided with at least one pawl along the circumference. The pawl is long and narrow. One end of the pawl is slidably connected to the fixing groove of the fixed end. The other end of the pawl is engaged with the gear teeth through an inclined surface to achieve unidirectional rotation.

[0007] The inner surface of the movable engagement member is provided with at least one locking tooth, the head of the locking tooth protruding from the end face of the movable engagement member; the two sides of the locking tooth are inclined surfaces that gradually approach the head; the shape of the locking groove corresponds to the locking tooth; and the shape of the unlocking groove corresponds to the head of the locking tooth.

[0008] The elastic element is a compression spring, which is disposed inside the fixed end, between the bottom surface of the fixed end cavity and the end face of the movable engagement element.

[0009] The lower left and right ends of the seat are each coaxially provided with a fixed end, and the upper end of the footrest arm is cylindrical and rotatably disposed between the two fixed ends.

[0010] Compared to existing technologies, this invention features a simpler structure. The rotating unlocking component only rotates during unlocking and locking, remaining stationary at other times. The movable locking component only moves laterally. This mechanism is simpler, reduces component damage, and extends service life. By placing the protrusion on the end face of the rotating unlocking component, rather than its circumference, the required diameter of the unlocking component and its rotating end is reduced, thereby decreasing the overall size of the mechanism and saving space and cost. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the seat and footrest of this utility model.

[0012] Figure 2 yes Figure 1 Exploded view.

[0013] Figure 3 yes Figure 2 A magnified view of the middle section.

[0014] Figure 4 This is a sectional view of the connecting section on the left.

[0015] Figure 5 yes Figure 4 Hide the sectional view of the rotating end.

[0016] Figure 6 It is a 3D view of the rotating end.

[0017] Figure 7 This is a diagram showing the angles of the moving engaging part and the rotating unlocking part during unlocking.

[0018] Among them, 1 is the seat, 2 is the fixed end, 20 is the fixed groove, 3 is the foot pedal arm, 4 is the rotating end, 40 is the sliding long groove, 41 is the gear tooth, 42 is the reinforcing rib, 5 is the moving meshing part, 50 is the pawl, 51 is the locking tooth, 6 is the rotating unlocking part, 60 is the protrusion, 61 is the locking groove, and 62 is the unlocking groove. Detailed Implementation

[0019] In this utility model, unless otherwise expressly specified and limited, the technical terms used in this application shall have the ordinary meaning understood by those skilled in the art. Terms such as "connected," "linked," "fixed," and "set" shall be interpreted broadly, referring to fixed connections, detachable connections, or integral connections; direct connections or indirect connections via an intermediate medium; mechanical connections or electrical connections. Unless otherwise expressly specified and limited, "above" or "below" a second feature may mean that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," or "over" a second feature may mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "under" a second feature may mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. Relational terms such as "first," "second," etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. The terms used in the description, such as “center,” “lateral,” “longitudinal,” “length,” “width,” “thickness,” “height,” “front,” “rear,” “left,” “right,” “up,” “down,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “axial,” “radial,” “circumferential,” “clockwise,” and “counterclockwise,” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation.

[0020] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. Figure 1-7As shown, a foot pedal adjustment mechanism includes a fixed end 2 connected to a seat 1, a foot pedal arm 3 with its lower end fixedly connected to the foot pedal and its upper left and right rotating ends 4 respectively rotatably connected to the fixed end 2 on the corresponding sides, and a movable engaging member 5 that can only move axially; one end of the movable engaging member 5 is slidably disposed on the fixed end 2, and the other end is provided with a pawl 50, which together with the rotating end 4 forms a ratchet mechanism for unidirectional upward rotation adjustment of the rotating end 4; the movable engaging member 5 is subjected to an elastic force from an elastic member that moves towards the rotating end 4; it also includes a rotation unlocking member 6; the... One end of the rotating unlocking member 6 is rotatably disposed in the rotating end 4, and the two have a predetermined relative rotation angle. The other end of the rotating unlocking member 6 is provided with a deeper locking groove 61 and a shallower unlocking groove 62. The movable engaging member 5 is provided with a locking tooth 51 that engages with either the locking groove 61 or the unlocking member. After the rotating end 4 rotates to the position that drives the rotating unlocking member 6 to rotate, the rotating unlocking member 6 rotates, causing the locking tooth 51 to switch between the locking groove 61 and the unlocking groove 62, thereby realizing the switching between gear adjustment and unlocking between the movable engaging member 5 and the rotating end 4.

[0021] When the locking tooth 51 engages with the deeper locking groove 61, the moving engagement member 5 moves axially closer to the rotating unlocking member 6 and the rotating end 4. At this time, the pawl 50 of the moving engagement member 5 engages with the ratchet of the rotating end 4 to achieve unidirectional rotation. When the pedal is turned upward, the rotating end 4 can rotate to different angles to adjust the gear. The pedal is subjected to a downward force and will not rotate downward. During gear adjustment, the rotating end 4 rotates, but the rotating unlocking member 6 located in the rotating end 4 does not rotate with it; at this time, the locking tooth 51 always engages with the locking groove 61. Until the relative rotation angle between the two is exhausted, the pedal is turned upward, and the rotating end 4 pushes the rotating unlocking member 6 to rotate upward together. Rotation occurs between the rotating unlocking member 6 and the locking tooth 51, and the inclined surface of the locking groove 61 of the rotating unlocking member 6 pushes the locking tooth 51 and the moving engagement member 5 to move away from the rotating end 4. When the unlocking slot 62 rotates to engage with the locking tooth 51, the moving engagement member 5 stops moving. At this time, the pawl 50 of the moving engagement member 5 separates from the rotating end 4, and the moving engagement member 5 is unlocked from the rotating end 4. The rotating arm can then rotate freely up and down. When the rotating end 4 rotates downwards to contact the rotating unlocking member 6 in another direction, the rotating end 4 drives the rotating unlocking member 6 to rotate downwards. The locking tooth 51 re-engages with the locking slot 61, allowing the foot pedal angle to be adjusted upwards again. This invention has a simple structure. The rotating unlocking member 6 only rotates during unlocking and locking, and does not move or rotate at other times. The moving locking member only moves laterally. This type of movement is simpler, the components are less prone to damage, and the lifespan is longer.

[0022] The rotating unlocking component 6 and the rotating end 4 are rotatably connected with a predetermined relative rotation angle via a sliding block mechanism. The rotating unlocking component 6 has a protrusion 60 on its end face, and the rotating end 4 has a sliding groove 40 within its cavity corresponding to the protrusion 60. The sliding groove 40 has an angle not less than the sum of the angles corresponding to the protrusion 60 and the distance between the centers of at least two ratchet teeth. The ratchet teeth are located on the outer ring of the rotating end 4, and the sliding groove 40 is located on the inner ring of the rotating end 4. The sliding groove 40 only contacts one end of the protrusion 60 after the rotating end 4 has rotated at least one stop, after which both rotate together. Figure 6 A low-height reinforcing rib 42 is also provided in the middle of the sliding groove 40, but the reinforcing rib 42 does not interfere with the protrusion 60.

[0023] Of course, the sliding block mechanism can also be configured in other ways. For example, the protrusion 60 can be located on the rotating end 4, and the sliding groove 40 can be located on the end face of the rotating unlocking member 6. This invention places the protrusion 60 on the end face of the rotating unlocking member 6, rather than on the circumferential surface, reducing the required diameter of the rotating unlocking member 6 and the rotating end 4, thereby reducing the overall size of the mechanism and saving space and cost. Furthermore, a cylinder is located at the center of the rotating end 4, and a cylinder is also located at the center of the fixed end 2. The moving engaging member 5 is fitted onto the cylinder of the fixed end 2, and the rotating unlocking member 6 is rotatably mounted on the cylinder of the rotating end 4. The two cylinders are rotatably connected through stepped holes at their ends. The same rotating shaft can pass through both cylinders. These are common technologies and will not be described in detail further.

[0024] The rotating end 4 has a plurality of shift teeth 41 arranged circumferentially within its cavity. The movable engaging member 5 is a hollow cylindrical shape, and at least one pawl 50 is arranged circumferentially on its outer surface. The pawl 50 is elongated, with one end slidably connected to the fixing groove 20 of the fixed end 2, and the other end engaging with the shift teeth 41 via an inclined surface to achieve unidirectional rotation. The shift teeth 41 are ratchet teeth. When the rotating end 4 rotates upward, the contact surface between the shift teeth 41 and the pawl 50 is an inclined surface, while the other side is a vertical surface, preventing rotation in the opposite direction. Preferably, the surface where the pawl 50 engages with the inclined surface of the shift teeth 41 is also an inclined surface. In this invention, the other end of the pawl 50, which engages with the rotating end 4 to achieve unidirectional rotation, engages with the fixed end 2 to achieve linear movement. These two functions are integrated into a single elongated pawl 50, making this invention simpler and easier to manufacture than separate structures.

[0025] The inner surface of the movable engaging member 5 is provided with at least one locking tooth 51, the head of which extends out of the end face of the movable engaging member 5. The two sides of the locking tooth 51 are inclined surfaces that gradually approach the head. The shape of the locking groove 61 corresponds to the locking tooth 51, and the shape of the unlocking groove 62 corresponds to the head of the locking tooth 51. The inclined surface shape on both sides facilitates bidirectional rotation.

[0026] The elastic element is a compression spring, which is disposed inside the fixed end 2, between the bottom surface of the cavity of the fixed end 2 and the end face of the movable engaging member 5. The compression spring can also be disposed in other locations, as long as it provides elastic force in a suitable direction. The compression spring is not shown in the figure.

[0027] The lower left and right ends of the seat 1 are respectively coaxially provided with a fixed end 2, and the upper end of the foot pedal arm 3 is cylindrical and is rotatably disposed between the two fixed ends 2.

[0028] In practice: When adjusting the pedal angle, rotate the pedal upwards. Multiple gears are available, and the rotating end 4 can be rotated to different angles to adjust the gear. At this time, the pedal is subjected to a downward force and will not rotate downwards. To retract the pedal or adjust it downwards, continue rotating the pedal upwards until the moving engagement 5 is unlocked from the rotating end 4. At this point, the rotating arm and pedal can fall freely. Once the pedal has rotated downwards to its original position and can no longer be rotated downwards, it can be rotated upwards again to adjust the gear and angle.

[0029] The technical features of the embodiments described above can be combined in any way, and as long as there is no contradiction in the combination of these technical features, they should all be considered within the scope of this specification. Without departing from the overall concept of this utility model, any equivalent substitutions or modifications made to the technical solution of this utility model, as well as any changes and improvements, should also be considered within the protection scope of this utility model.

Claims

1. A foot pedal adjustment mechanism, comprising a fixed end connected to a seat, a foot pedal arm with its lower end fixedly connected to the foot pedal and its upper left and right rotating ends respectively rotatably connected to the fixed end on the corresponding side, and a movable engagement member that can only move axially; one end of the movable engagement member is slidably disposed on the fixed end, and the other end is provided with a pawl to form a ratchet mechanism with the rotating end for unidirectional upward rotation adjustment; the movable engagement member is subjected to an elastic force from an elastic member that moves towards the rotating end; characterized in that: It also includes a rotating unlocking component; one end of the rotating unlocking component is rotatably disposed in the rotating end and the two have a predetermined relative rotation angle, and the other end of the rotating unlocking component is provided with a deeper locking groove and a shallower unlocking groove. The movable engaging component is provided with locking teeth that cooperate with either the locking groove or the unlocking component; After the rotating end rotates to the position that drives the rotating unlocking component to rotate: the rotation of the rotating unlocking component causes the locking teeth to switch between the locking groove and the unlocking groove, realizing the switching between the moving engagement component and the rotating end in gear adjustment and unlocking.

2. The foot pedal adjustment mechanism according to claim 1, characterized in that: The rotating unlocking component and the rotating end are connected by a sliding groove slider mechanism to achieve a predetermined relative rotation angle: wherein the end face of the rotating unlocking component is provided with a protrusion, and the cavity of the rotating end is provided with a sliding groove corresponding to the protrusion with an angle not less than the sum of the angles corresponding to the protrusion and the distance between the centers of at least two ratchet teeth.

3. The foot pedal adjustment mechanism according to claim 1, characterized in that: The rotating end cavity is provided with several gear teeth along the circumference. The moving engagement member is a hollow cylindrical shape. The outer surface of the moving engagement member is provided with at least one pawl along the circumference. The pawl is long and narrow. One end of the pawl is slidably connected to the fixing groove of the fixed end. The other end of the pawl is engaged with the gear teeth through an inclined surface to achieve unidirectional rotation.

4. The foot pedal adjustment mechanism according to claim 3, characterized in that: The inner surface of the movable engagement member is provided with at least one locking tooth, the head of the locking tooth protruding from the end face of the movable engagement member; the two sides of the locking tooth are inclined surfaces that gradually approach the head; the shape of the locking groove corresponds to the locking tooth; and the shape of the unlocking groove corresponds to the head of the locking tooth.

5. The foot pedal adjustment mechanism according to claim 1, characterized in that: The elastic element is a compression spring, which is disposed inside the fixed end, between the bottom surface of the fixed end cavity and the end face of the movable engagement element.

6. A foot pedal adjustment mechanism according to any one of claims 1-5, characterized in that: The lower left and right ends of the seat are each coaxially provided with a fixed end, and the upper end of the footrest arm is cylindrical and rotatably disposed between the two fixed ends.

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