Headrest adjusting mechanism of trolley

Abstract

The utility model provides a pusher headrest adjusting mechanism which comprises a headrest arranged on a backrest in a sliding mode, a headrest height adjusting mechanism is arranged between the headrest and the backrest, any one of the backrest or the headrest is provided with at least one long groove, the length direction of the long groove is parallel to the sliding direction of the headrest, and the upper end and the lower end of the long groove are closed. The other one of the backrest or the headrest is provided with a sliding clamping hook corresponding to each long groove; the width of the head of the sliding clamping hook is larger than that of the clamping groove. The head of the sliding clamping hook penetrates through the long groove from the rear side of the headrest to the front side of the headrest. The sliding connection of the headrest and the backrest is realized through the matching of the long groove and the sliding clamping hook; the two ends of the long groove are closed to limit the up-down moving distance of the headrest, and the sliding clamping hook and the long groove are assembled and disassembled through the elasticity between the sliding clamping hook and the long groove. The structure is simple and manufacturing is convenient.

Description

Technical Field

[0001] The utility model belongs to the field of baby and child strollers, and particularly relates to a stroller headrest adjustment mechanism. Background Art

[0002] The headrest is where the baby's head rests. Babies of different ages have different heights, and the position of their heads also varies. A stroller's headrest needs to meet the needs of babies of all ages. Existing strollers, such as patent CN206031452U, feature a retractable backrest that allows for adjustable headrest height. However, this adjustment requires pressing a dedicated unlock button to adjust the position, making it cumbersome to operate.

[0003] Patent CN222022748U discloses a baby stroller headrest adjustment mechanism that eliminates the need for buttons; simply pulling the headrest adjusts its position. A slide plate is fixed to the backrest, and the headrest slides onto the slide plate. Slots are provided on the left and right sides of the headrest's back, located on the axis. The slide plate slides into the corresponding slots, one opening to the left and one to the right. When installing the headrest between the slide plate and the headrest, the headrest must be placed on the slide plate from above and then secured to the backrest after installation. If the headrest is pulled upward or pushed downward, the displacement is too great, and the headrest may fall off the slide plate. To facilitate installation, a stopper mechanism cannot be provided on the slide plate. Instead, upper and lower stoppers are provided at corresponding positions on the backrest to limit the headrest's position. A connection structure between the headrest and the slide plate is needed for use in a headrest adjustment mechanism that is simple in structure, convenient for position control, and prevents it from falling off. Summary of the Invention

[0004] The utility model provides a cart headrest adjustment mechanism.

[0005] The purpose of the utility model is achieved in the following way: a stroller headrest adjustment mechanism includes a headrest slidably arranged on a backrest, a headrest height adjustment mechanism is arranged between the headrest and the backrest, either the backrest or the headrest is provided with at least one long slot whose length direction is parallel to the sliding direction of the headrest, and the upper and lower ends of the long slot are closed; the other of the backrest or the headrest is provided with a sliding hook corresponding to each long slot; the width of the head of the sliding hook is greater than the width of the slot; the head of the sliding hook passes through the long slot from the rear side of the headrest to the front side of the headrest.

[0006] At least one spring sheet is provided on either the left or right side or both sides of the long slot to facilitate the sliding hook to pass through the long slot, and the end face of the spring sheet is part of the side face of the long slot; the length of the spring sheet in the upper and lower directions is not less than the length of the sliding hook in the upper and lower directions, and notches are respectively provided at the upper and lower ends of the spring sheet to separate them from the rest of the positions on the same side of the long slot.

[0007] The thickness of the elastic sheet is smaller than the thickness of the remaining positions on both sides of the long slot, and the sum of the width of the long slot and the width of the elastic sheet at the corresponding position is not less than the width of the sliding hook head.

[0008] Two parallel long slots are provided on the headrest; the spring sheets are provided on the right side of the left long slot and on the left side of the right long slot respectively, and the two spring sheets are symmetrically provided on the headrest; the sliding hook is provided at the position of the backrest corresponding to each long slot; the two sliding hooks on the backrest are symmetrically provided; the head of the sliding hook is stuck on the side of the long slot where the spring sheet is not provided.

[0009] A slide plate is fixedly provided on the surface of the backrest close to the headrest, the two long grooves are respectively provided on the headrest, two long grooves are provided on the headrest, and the two sliding hooks cooperating with the two long grooves are fixedly provided on the slide plate; the headrest height adjustment mechanism is provided between the slide plate and the headrest.

[0010] The headrest height adjustment mechanism includes a plurality of gear teeth arranged in a vertical row on the headrest, located between two long slots, and a card shaft is provided on the slide rail plate between the two sliding hooks; at least one of the card shaft and the gear teeth is an elastic part, and when the headrest is pulled, the elastic parts in the card shaft and the gear teeth are elastically deformed so that the card shaft passes over the gear teeth.

[0011] Compared to the existing technology, the headrest adjustment mechanism of the present invention achieves a sliding connection between the headrest and the backrest through the cooperation of the long slot and the sliding hook. The long slot is closed at both ends to limit the vertical movement of the headrest, eliminating the need for special limiters on the backrest. The sliding hook and the long slot are installed and removed through the elasticity between them. The structure is simple and easy to manufacture. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a diagram of the backrest and headrest.

[0013] Figure 2 yes Figure 1 Enlarged view of the connection between the center headrest and backrest.

[0014] Figure 3 This is a front view of the center part of the headrest.

[0015] Figure 4 yes Figure 3 the back of .

[0016] Figure 5 This is a schematic diagram of the slide rail plate.

[0017] Figure 6This is the back side of the headrest and slide plate connection diagram.

[0018] Figure 7 This is the fixed connection diagram of the slide rail plate and the backrest.

[0019] Figure 8 This is the matching diagram of the card shaft and the gear slot.

[0020] Among them, 1 is the backrest, 2 is the headrest, 3 is the long slot, 4 is the sliding hook, 5 is the spring, 6 is the slide plate, 7 is the gear gear, and 8 is the card shaft. DETAILED DESCRIPTION

[0021] In this utility model, unless otherwise specified or limited, the technical terms used herein shall have the ordinary meanings understood by persons skilled in the art to which this utility model relates. Terms such as "connected," "connected," "fixed," and "disposed" should be interpreted broadly and may refer to fixed, removable, or integral connections; direct or indirect connections through an intermediary; and mechanical or electrical connections. Unless otherwise specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact or indirect contact through an intermediary. Furthermore, a first feature being "above," "above," or "above" a second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," or "below" a second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature. Relational terms such as first and second are used solely to distinguish one entity or operation from another and do not necessarily require or imply any actual relationship or order between these entities or operations. The terms used in the description, such as "center", "transverse", "longitudinal", "length", "width", "thickness", "height", "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", "clockwise", "counterclockwise", etc., to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operate in a specific orientation.

[0022] The following will combine the accompanying drawings and specific embodiments to clearly and completely describe the technical solution of the present invention. Figure 1-8A stroller headrest 2 adjustment mechanism is shown, comprising a headrest 2 slidably mounted on a backrest 1, with a height adjustment mechanism disposed between the headrest 2 and the backrest 1. The mechanism is characterized in that: either the backrest 1 or the headrest 2 is provided with at least one slot 3 whose length is parallel to the sliding direction of the headrest 2, and the slot 3 is closed at both ends. A sliding hook 4 is provided on the other of the backrest 1 or the headrest 2, corresponding to each slot 3. The width of the head of the sliding hook 4 is greater than the width of the slot. The head of the sliding hook 4 passes through the slot 3 from the rear side of the headrest 2 to the front side of the headrest 2. The side of the headrest 2 that contacts the user is the front side, and the other side is the rear side. The length of the slot 3 is the direction of the vertical sliding of the headrest 2. The closed ends of the slot 3 mean that the sliding hook 4 within the slot 3 has an upper and lower limit position, preventing it from moving out of the slot 3 during vertical movement. The headrest 2 and the backrest 1 can be made of existing materials, such as plastic. The height adjustment mechanism of the headrest 2 can be any of the existing height adjustment mechanisms, such as the mechanism described in Patent CN222022748U. In a specific structure, the headrest 2 is provided with an elongated slot 3 and the sliding hook 4 is provided on the backrest 1; or the headrest 2 is provided with a sliding buckle and the backrest 1 is provided with the elongated slot 3. Both solutions are within the scope of protection of the present invention. Preferably, a single elongated slot 3 or two parallel elongated slots 3 are provided for ease of installation. The shape of the sliding hook 4 can be set as needed and can take various forms, such as an L-shaped hook or an inverted T-shaped hook, as long as they function. The headrest 2 adjustment mechanism of the present invention achieves a sliding connection between the headrest 2 and the backrest 1 through the cooperation of the elongated slot 3 and the sliding hook 4. The closed ends of the elongated slot 3 limit the vertical movement distance of the headrest 2, eliminating the need for a dedicated limiter on the backrest 1. The elasticity between the sliding hook 4 and the elongated slot 3 enables installation and removal of the sliding hook 4 and the elongated slot 3. The structure is simple and easy to manufacture.

[0023] At least one spring clip 5 is provided on either or both of the left and right sides of the elongated slot 3 to facilitate the sliding hook 4's passage through the slot 3. The end surface of the spring clip 5 forms a portion of the side surface of the slot 3. The vertical length of the spring clip 5 is no less than that of the sliding hook 4. Notches are provided at the upper and lower ends of the spring clip 5, separating it from the rest of the slot 3 on the same side. The left and right sides of the slot 3 are overall strong and less susceptible to bending or deformation. The spring clip 5 separated from the rest of the slot by the notch is less strong and more easily bent, facilitating the passage of the head of the sliding hook 4 through the slot 3 at the location of the spring clip 5. The spring clip 5 can be provided on either or both sides of the slot 3, or on only one side. One spring clip 5 on each side is generally sufficient, but two or more may also be provided. A single spring clip 5 can be provided at the same height within the slot 3, or a pair of spring clips 5 can be symmetrically arranged on the left and right sides. These configurations are tailored to individual needs and fall within the scope of this invention.

[0024] The thickness of the spring clip 5 is smaller than the thickness of the remaining locations on either side of the long slot 3. The sum of the width of the long slot 3 plus the width of the spring clip 5 at the corresponding location is no less than the width of the head of the sliding hook 4. Reducing the thickness of the spring clip 5 further reduces the strength of the spring clip 5 and increases its elasticity. When the sum of the width of the long slot 3 plus the width of the spring clip 5 at the corresponding location is no less than the width of the head of the sliding hook 4, the sliding hook 4 is more likely to pass through. Of course, since the head of the elastic hook also has a certain degree of elasticity, the sum of the width of the long slot 3 plus the width of the spring clip 5 at the corresponding location is slightly less than the width of the hook head, and the hook can still pass through.

[0025] The headrest 2 is provided with two parallel slots 3. Spring clips 5 are provided on the right side of the left slot 3 and on the left side of the right slot 3, respectively. The two spring clips 5 are symmetrically arranged on the headrest 2. A sliding hook 4 is provided on the backrest 1 corresponding to each slot 3. The two sliding hooks 4 are symmetrically arranged on the backrest 1. The tops of the sliding hooks 4 engage the side of the slot 3 where the spring clip 5 is not provided. Specifically, the two sliding hooks 4 are symmetrical in shape: one can be L-shaped, and the other a mirror image of the L. Preferably, both sliding hooks 4 hook outwardly onto the upper surface of the headrest 2. Because the spring clip 5 has notches at both ends and its thickness can be smaller than the thickness of the headrest 2, i.e., a certain recess, the sliding hook 4 can engage the other side of the corresponding slot 3, i.e., the side where the spring clip 5 is not provided. This prevents the sliding hook 4 from entering the notches or recessed grooves of the spring clip 5 when the headrest 2 moves, causing a jam.

[0026] A slide plate 6 is fixedly provided on the surface of the backrest 1 near the headrest 2, and the two long slots 3 are respectively provided on the headrest 2. The headrest 2 is provided with two long slots 3, and the two sliding hooks 4 that cooperate with the two long slots 3 are fixedly provided on the slide plate 6; a height adjustment mechanism for the headrest 2 is provided between the slide plate 6 and the headrest 2. The height adjustment mechanism for the headrest 2 can also be provided directly between the backrest 1 and the headrest 2. The slide plate 6 and the backrest 1 can be connected by bolts or other detachable connection methods.

[0027] The headrest 2 height adjustment mechanism includes a plurality of vertically arranged shift teeth 7 disposed on the headrest 2 between the two elongated slots 3. A latching shaft 8 is disposed on the slide rail 6 between the two sliding hooks 4. At least one of the latching shaft 8 and the shift teeth 7 is an elastic member. When the headrest 2 is pulled, the elastic member in the latching shaft 8 or the shift teeth 7 elastically deforms, allowing the latching shaft 8 to pass over the shift teeth 7. Specifically, a mounting plate is disposed between the two sliding hooks 4, on which the latching shaft 8, which may be semicircular or otherwise shaped, is mounted. The highest point of the latching shaft 8 is slightly lower than the highest point of the sliding hooks 4. A shift slot is formed between two adjacent shift teeth 7. In operation, the latching shaft 8 is disposed in one of the shift slots. The common side surface of the shift slot and the shift teeth 7 is an inclined surface, and the angle between the common side surface and the bottom surface of the shift slot is greater than 90 degrees. Alternatively, the common side surface of the shift slot and the shift teeth 7 is a smoothly curved surface, and the vertically arranged shift teeth 7 form a wavy surface. Preferably, the clamping shaft 8 is an elastic part, and the upper surface of the row of gear slots is wavy. The material of the elastic part is the elasticity of the plastic part itself, or metal spring 5, or elastic materials such as built-in springs. In the present invention, the headrest 2 can be adjusted in height on the backrest 1, which is suitable for use by babies of different age groups. The height adjustment mechanism of the headrest 2 is unlocked by the elastic deformation between the clamping shaft 8 and the gear teeth 7. No special unlocking key is required. The headrest 2 can be unlocked by pulling it with a certain force, thereby adjusting the height of the headrest 2. The headrest 2 and the backrest 1 of the present invention are slidably connected, and the structure is simple and easy to install and disassemble.

[0028] During installation, the head of the sliding hook 4 passes through the elongated slot 3 from the back of the headrest 2 to the front through the elastic bending and deformation between the sliding hook 4 and the spring 5, completing the installation between the headrest 2 and the slide plate 6. The slide plate 6 is then fixed to the backrest 1. To adjust the height of the headrest 2, pull the headrest 2 upward or push it downward with appropriate force. The locking shaft 8 on the slide plate 6 moves over the gear teeth 7. Once the desired position is reached, the headrest 2 is released, and the locking shaft 8 snaps into the gear slot.

[0029] The technical features of the above-described embodiments may be combined in any manner, and as long as there are no contradictions in the combination of these technical features, they shall be deemed to be within the scope of this specification. Without departing from the overall concept of the present invention, the technical solutions of the present invention, their equivalent replacements or modifications, and certain changes and improvements made thereto shall also be deemed to be within the scope of protection of the present invention.

Claims

1. A stroller headrest adjustment mechanism, comprising a headrest slidably mounted on a backrest, and a headrest height adjustment mechanism disposed between the headrest and the backrest, characterized in that: Either the backrest or the headrest is provided with at least one long slot whose length direction is parallel to the sliding direction of the headrest, and the upper and lower ends of the long slot are closed; the other of the backrest or the headrest is provided with a sliding hook corresponding to each long slot; the width of the head of the sliding hook is greater than the width of the slot; the head of the sliding hook passes through the long slot from the rear side of the headrest to the front side of the headrest.

2. A stroller headrest adjustment mechanism according to claim 1, characterized in that: At least one spring sheet is provided on either the left or right side or both sides of the long slot to facilitate the sliding hook to pass through the long slot, and the end face of the spring sheet is part of the side face of the long slot; the length of the spring sheet in the upper and lower directions is not less than the length of the sliding hook in the upper and lower directions, and notches are respectively provided at the upper and lower ends of the spring sheet to separate them from the rest of the positions on the same side of the long slot.

3. The stroller headrest adjustment mechanism according to claim 2, characterized in that: The thickness of the elastic sheet is smaller than the thickness of the remaining positions on both sides of the long slot, and the sum of the width of the long slot and the width of the elastic sheet at the corresponding position is not less than the width of the sliding hook head.

4. The stroller headrest adjustment mechanism according to claim 2, characterized in that: Two parallel long slots are provided on the headrest; the spring sheets are provided on the right side of the left long slot and on the left side of the right long slot respectively, and the two spring sheets are symmetrically provided on the headrest; the sliding hook is provided at the position of the backrest corresponding to each long slot; the two sliding hooks on the backrest are symmetrically provided; the head of the sliding hook is stuck on the side of the long slot where the spring sheet is not provided.

5. The stroller headrest adjustment mechanism according to claim 4, characterized in that: A slide plate is fixedly provided on the surface of the backrest close to the headrest, the two long grooves are respectively provided on the headrest, two long grooves are provided on the headrest, and the two sliding hooks cooperating with the two long grooves are fixedly provided on the slide plate; the headrest height adjustment mechanism is provided between the slide plate and the headrest.

6. The stroller headrest adjustment mechanism according to claim 5, characterized in that: The headrest height adjustment mechanism includes a plurality of gear teeth arranged in a vertical row on the headrest, located between two long slots, and a card shaft is provided on the slide rail plate between the two sliding hooks; at least one of the card shaft and the gear teeth is an elastic part, and when the headrest is pulled, the elastic parts in the card shaft and the gear teeth are elastically deformed so that the card shaft passes over the gear teeth.

Images