CN220262874U - Push rod assembly and child cart - Google Patents

Abstract

The utility model discloses a push rod assembly and a child trolley, wherein the push rod assembly comprises a lower push rod, a middle push rod, an upper push rod, a first locking mechanism for locking the lower push rod and the middle push rod, a second locking mechanism for locking the middle push rod and the upper push rod, a first unlocking mechanism and a first unlocking piece which is rotatably arranged on the upper push rod and matched with the first unlocking mechanism, when the first unlocking mechanism is operated, the first unlocking piece is positioned at a first position, the second locking mechanism is unlocked, and when the upper push rod slides downwards, the first unlocking piece is matched with the first locking mechanism to unlock the first locking mechanism; when the first unlocking mechanism is released, the first unlocking piece is in the second position, and at the moment, when the upper push rod slides downwards, the first unlocking piece can be matched with the first locking mechanism so as not to drive the first locking mechanism to unlock. The push rod assembly can avoid unlocking the first locking mechanism when the upper push rod slides downwards and is close to the middle push rod due to misoperation.

Description

Push rod assembly and child cart

Technical Field

The utility model relates to the technical field of children products, in particular to a push rod assembly and a children handcart.

Background

Child carts are typically used when a adult is carrying a child outside. The child stroller can be folded generally, so that the child stroller is convenient to carry and store. The baby carriage generally comprises a carriage frame, wherein the carriage frame comprises a push rod assembly and a bottom bracket, and the push rod assembly is rotationally connected with the bottom bracket. In order to enable the structural volume of the folded child stroller to be smaller, a push rod assembly of a part of the child stroller in the prior art comprises an upper push rod, a middle push rod and a lower push rod which are sequentially connected in a sliding mode, and relative positions of the upper push rod and the middle push rod and between the middle push rod and the lower push rod are locked through locking mechanisms. In order to enable the child stroller to be folded conveniently, only one unlocking mechanism is arranged, and after the unlocking mechanism is operated to unlock the locking mechanism between the upper push rod and the middle push rod, the locking mechanism between the middle push rod and the lower push rod can be linked and unlocked when the upper push rod slides downwards and the middle push rod is close to each other. When the unlocking mechanism is operated by mistake, the locking mechanism between the upper push rod and the middle push rod and between the middle push rod and the lower push rod can be unlocked, so that the middle push rod also slides downwards to be close to the lower push rod, the awning slides downwards to collide with a child sitting on the child trolley, and the child trolley has certain potential safety hazard when in use.

Disclosure of Invention

The utility model aims at overcoming the defects in the prior art, and provides a push rod assembly capable of avoiding unlocking a first locking mechanism between a middle push rod and a lower push rod when an upper push rod slides downwards and the middle push rod is close due to misoperation.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a push rod assembly comprising a lower push rod, a middle push rod which can be arranged on the lower push rod in a sliding manner along the length extension direction of the lower push rod, an upper push rod which can be arranged on the middle push rod in a sliding manner along the length extension direction of the middle push rod, a first locking mechanism for locking the relative positions of the lower push rod and the middle push rod, a second locking mechanism for locking the relative positions of the middle push rod and the upper push rod, and a first unlocking mechanism, wherein the push rod assembly further comprises a first unlocking piece for driving the first locking mechanism to unlock, the first unlocking piece can be rotatably arranged on the upper push rod, and the first unlocking piece is matched with the first unlocking mechanism, and when the first unlocking mechanism is operated, the first unlocking piece is in a first position and the second locking mechanism is unlocked; when the first unlocking mechanism is released, the first unlocking piece is in a second position; when the first unlocking piece is positioned at the second position and the upper push rod slides downwards to be close to the middle push rod, the first unlocking piece is matched with the first locking mechanism and cannot drive the first locking mechanism to unlock; when the first unlocking piece is positioned at the first position and the upper push rod slides downwards to be close to the middle push rod, the first unlocking piece is matched with the first locking mechanism to drive the first locking mechanism to be unlocked.

Preferably, the first locking mechanism includes a first locking piece slidably provided on one of the middle push rod and the lower push rod and a first locking groove provided on the other, the first locking piece being insertable into or releasable from the first locking groove; when the first unlocking piece is positioned at the second position and the upper push rod slides downwards, the first unlocking piece can be in propping fit with the first locking piece and cannot slide the first locking piece; when the first unlocking piece is positioned at the first position and the upper push rod slides downwards, the first unlocking piece can be in propping fit with the first locking piece to drive the first locking piece to slide.

Further, an unlocking part is arranged on the first unlocking piece, and a first matching part and a second matching part are respectively arranged on the first locking piece; when the first unlocking piece is positioned at a first position, the position of the unlocking part corresponds to the position of the first matching part, and when the upper push rod slides downwards, the first unlocking piece can be propped against the first matching part to be matched; when the first unlocking piece is positioned at the second position, the position of the unlocking part corresponds to the position of the second matching part, and when the upper push rod slides downwards, the first unlocking piece can be propped against the second matching part to be matched.

Still further, the unlocking part is provided with a first inclined plane, the first matching part is provided with a second inclined plane matched with the first inclined plane, and when the first unlocking part is positioned at the first position, the first inclined plane and the second inclined plane can be propped against each other to be matched when the upper push rod slides downwards.

In a specific embodiment, the second mating portion is an upper end face of the first locking member, the first mating portion is a groove recessed from the upper end face of the first locking member, and the second inclined surface is a side face of the groove.

Preferably, the first unlocking mechanism comprises a second unlocking piece which can be slidably arranged in the upper push rod, the second unlocking piece is respectively in propping fit with the first unlocking piece and the second locking mechanism, and when the second unlocking piece is driven to slide relative to the upper push rod to unlock the second locking mechanism, the first unlocking piece rotates from a second position to a first position relative to the upper push rod.

Further, the first unlocking mechanism further comprises an unlocking button arranged on the upper push rod and a traction rope with one end part directly or indirectly arranged on the unlocking button, and the other end part of the traction rope is arranged on the second unlocking piece.

Preferably, the child stroller further comprises a first resilient member for urging the first unlocking member to rotate from the first position to the second position.

Preferably, the second locking mechanism comprises a second locking piece movably arranged on the upper push rod and a second locking groove arranged on the middle push rod, and the second locking piece can be inserted into or separated from the second locking groove.

Further, the first unlocking mechanism comprises a second unlocking piece which can be arranged in the upper push rod in a sliding mode, and the second unlocking piece is in propping fit with the second locking piece.

Further, the second locking piece comprises a body part with elasticity and a locking pin arranged at one end part of the body part, the locking pin can be inserted into or separated from the second locking groove, and the second unlocking piece is propped against the body part through an inclined plane to be matched.

The present utility model also provides a stroller having a push rod assembly according to any one of the above.

Preferably, the child stroller further comprises a bottom bracket, the push rod assembly is rotatably arranged on the bottom bracket, the child stroller further comprises a third locking mechanism for locking the relative positions of the push rod assembly and the bottom bracket, and a second unlocking mechanism movably arranged on the lower push rod and used for driving the third locking mechanism to unlock, and when the middle push rod slides downwards to be close to the lower push rod, the middle push rod can be matched with the second unlocking mechanism so as to drive the second unlocking mechanism to act to unlock the third locking mechanism.

Further, the first locking mechanism comprises a first locking piece capable of being slidably arranged on the middle push rod and a first locking groove arranged on the lower push rod, the first locking piece can be inserted into the first locking groove or separated from the first locking groove, the first locking groove is respectively arranged at the upper end and the lower end of the lower push rod, when the push rod assembly is in a unfolding state, the first locking piece is inserted into the first locking groove at the upper part, and when the middle push rod slides downwards to be close to the lower push rod, the first locking piece can be inserted into the first locking groove at the lower part, so that the middle push rod cannot slide downwards to be matched with the second unlocking mechanism.

Still further, the push rod assembly further comprises a third unlocking piece fixedly arranged on the lower push rod and positioned at the position of the first locking groove at the lower part, a third inclined surface is arranged on the third unlocking piece, and when the first locking piece is inserted into the first locking groove at the lower part, the first locking piece is in propping fit with the third inclined surface.

Due to the application of the technical scheme, compared with the prior art, the utility model has the following advantages: when the first unlocking mechanism is operated by mistake to unlock the second locking mechanism, and the upper push rod slides downwards to be close to the middle push rod, the first unlocking piece is matched with the first locking mechanism, so that the first locking mechanism cannot be unlocked, and the middle push rod cannot slide downwards, so that the awning cannot collide with a child sitting on the child trolley, and the safety performance of the child trolley in use can be improved.

Drawings

Fig. 1 is a schematic perspective view of a stroller in an unfolded state according to the present embodiment;

FIG. 2 is a perspective view of the push rod assembly of the present embodiment in an expanded state;

FIG. 3 is a schematic cross-sectional view of the push rod assembly of the present embodiment in an expanded state;

FIG. 4 is a rotational enlarged schematic view of FIG. 3 with a portion of the structure removed;

FIG. 5 is a schematic cross-sectional view of the push rod assembly of the stroller of the present embodiment in a deployed state after the first unlocking mechanism is operated to unlock the second locking mechanism;

FIG. 6 is a rotational enlarged schematic view of FIG. 5 with a portion of the structure removed;

FIG. 7 is a front view of the push rod assembly of the present embodiment with a portion of the structure removed when the upper push rod slides downward and the middle push rod approaches (the first locking mechanism is in a locked state);

FIG. 8 is a schematic cross-sectional view of the push rod assembly of the present embodiment with a portion of the structure removed when the upper push rod is slid downward and the middle push rod is closed (the first locking mechanism is in a locked state);

FIG. 9 is an enlarged schematic view of a portion of FIG. 8 at A;

FIG. 10 is a front view of the push rod assembly of the present embodiment with a portion of the structure removed when the upper push rod slides downward and the middle push rod approaches (the first locking mechanism is in an unlocked state);

FIG. 11 is a schematic cross-sectional view of the push rod assembly of the present embodiment with a portion of the structure removed when the upper push rod slides downward and the middle push rod approaches (the first locking mechanism is in an unlocked state);

FIG. 12 is an enlarged schematic view of a portion of FIG. 11 at A;

FIG. 13 is a front view of the push rod assembly of the present embodiment with a portion of the structure removed when the middle push rod slides downward and the lower push rod approaches together (the first locking mechanism is in a locked state);

FIG. 14 is a schematic cross-sectional view of the push rod assembly of the present embodiment with a portion of the structure removed when the middle push rod is slid downward and the lower push rod is closed (the first locking mechanism is in a locked state);

FIG. 15 is an enlarged schematic view of a portion of FIG. 14 at A;

FIG. 16 is a side view of the push rod assembly of the present embodiment with a portion of the structure removed when the middle push rod is slid downward and the lower push rod is closed (the first locking mechanism is in a locked state);

FIG. 17 is a front view of the push rod assembly of the present embodiment with a portion of the structure removed when the middle push rod slides downward and the lower push rod approaches together (the first locking mechanism is in an unlocked state);

FIG. 18 is a schematic cross-sectional view of the push rod assembly of the present embodiment with a portion of the structure removed when the middle push rod slides downward and the lower push rod approaches (the first locking mechanism is in an unlocked state);

FIG. 19 is an enlarged schematic view of a portion of FIG. 18 at A;

fig. 20 is a schematic side view of the push rod assembly of the present embodiment with a portion of the structure removed when the middle push rod slides downward and the lower push rod approaches (the first locking mechanism is in an unlocked state).

Wherein: 100. a bottom bracket; 1. an upper push rod; 2. a middle push rod; 21. a second locking groove; 3. a push rod is downwards pushed; 31. a first locking groove; 32. a third unlocking member; 321. a third ramp 4, a first locking member; 41. a first mating portion; 411. a second inclined surface; 42. a second mating portion; 51. a second locking member; 511. a body portion; 511a, a fourth bevel; 512. a locking pin; 52. a third elastic member; 6. a third locking member; 71. an unlock button; 72. a second unlocking member; 721. a fifth inclined surface; 73. a traction cable; 81. a first unlocking member; 811. an unlocking part; 811a, a first bevel; 82. a first elastic member; 9. and a second unlocking mechanism.

Detailed Description

The technical scheme of the utility model is further described below with reference to the attached drawings and specific embodiments.

The child stroller of the present utility model has an expanded state and a collapsed state. As shown in fig. 1, the stroller includes a bottom bracket 100 and a push rod assembly disposed on the bottom bracket 100.

As shown in fig. 2, the push rod assembly includes an upper push rod 1, a middle push rod 2, and a lower push rod 3. The middle push rod 2 is slidably provided on the lower push rod 3 in the longitudinal extension direction of the lower push rod 3, and the upper push rod 1 is slidably provided on the middle push rod 2 in the longitudinal extension direction of the middle push rod 2. In this embodiment, the upper push rod 1, the middle push rod 2 and the lower push rod 3 each have a lumen extending in the longitudinal direction thereof, the middle push rod 2 is slidably disposed in the lumen of the lower push rod 3, and the upper push rod 1 is slidably disposed in the lumen of the middle push rod 2.

When the stroller is in the unfolded state, the upper push rod 1 extends upwards to the outside of the lumen of the middle push rod 2, and the middle push rod 2 extends upwards to the outside of the lumen of the lower push rod 3. When the stroller is in the collapsed condition, the upper push rod 1 is mostly retracted into the lumen of the middle push rod 2, and the middle push rod 2 is mostly retracted into the lumen of the lower push rod 3.

The push rod assembly further comprises a first locking mechanism for locking the relative positions of the middle push rod 2 and the lower push rod 3. When the first locking mechanism is in the locked state, the middle push rod 2 and the lower push rod 3 cannot slide relatively. When the first locking mechanism is in the unlocked state, the middle push rod 2 can slide relative to the lower push rod 3.

The first locking mechanism includes a first locking piece 4 slidably provided on one of the middle push rod 2 and the lower push rod 3 and a first locking groove 31 provided on the other. When the first locking mechanism is in the locked state, the first locking piece 4 is inserted in the first locking groove 31 so that the middle push rod 2 and the lower push rod 3 cannot slide relatively, as shown in fig. 8, 9, 14 and 15. When the first locking mechanism is in the unlocked state, the first locking piece 4 is disengaged from the first locking groove 31, so that the center push rod 2 can slide with respect to the lower push rod 3, as shown in fig. 11, 12, 18 and 19. In this embodiment, the first locking member 4 is slidably disposed in the lumen of the middle push rod 2, and the first locking groove 31 is disposed on the lower push rod 3, so that the first locking member 4 can be inserted into the first locking groove 31 or removed from the first locking groove 31 by sliding the first locking member 4 relative to the middle push rod 12.

The push rod assembly further comprises a second elastic member (not shown in the drawings), and the elastic force of the second elastic member is used for driving the first locking member 4 to slide in the direction of inserting into the first locking groove 31.

The push rod assembly further comprises a second locking mechanism for locking the relative positions of the upper push rod 1 and the middle push rod 2. When the second locking mechanism is in the locked state, the upper push rod 1 and the middle push rod 2 cannot slide relatively. When the first locking mechanism is in the unlocked state, the upper push rod 1 can slide relative to the middle push rod 2.

The second locking mechanism includes a second locking piece 51 movably provided on the upper push rod 1 and a second locking groove 21 provided on the middle push rod 2. The second locking member 51 includes a body portion 511 and a locking pin 512, the body portion 511 having elasticity, the locking pin 512 being provided at one end portion of the body portion 511. When the second locking mechanism is in the locked state, the locking pin 512 is inserted in the second locking groove 21 so that the upper push rod 1 and the middle push rod 2 cannot slide relatively, as shown in fig. 3 and 4. When the second locking mechanism is in the unlocked state, the locking pin 512 is disengaged from the second locking groove 21, thereby enabling the upper push rod 1 to slide with respect to the middle push rod 2, as shown in fig. 5 and 6. By swinging the body portion 511 relative to the push-up lever 1, the lock pin 512 can be inserted into the second lock groove 21 or removed from the second lock groove 21.

The push rod assembly further includes a third elastic member 52, and the elastic force of the third elastic member 52 is used to urge the second locking member 51 to swing in a direction in which the locking pin 512 is inserted into the second locking groove 21.

The lower push rod 3 is rotatably connected with the bottom bracket 100, so that when the stroller is folded, the whole push rod assembly can rotate relative to the bottom bracket 100 to be close to the bottom bracket 100. The stroller further comprises a third locking mechanism for locking the relative position of the push down rod 3 and the bottom bracket 100, the position of the entire bottom bracket 100 being locked when the third locking mechanism is in the locked state. The third locking mechanism may adopt a structure in the related art, such as the third locking mechanism including a third locking piece 6 slidably provided between the push down lever 3 and the bottom bracket 100, the third locking piece 6 having locking teeth, as shown in fig. 3, 5, 8, 11, 14, and 18. The lower push rod 3 and the bottom bracket 100 are provided with tooth grooves capable of being engaged with the locking teeth. When the third locking mechanism is in the locked state, the locking teeth are engaged with the tooth grooves on the push down rod 3 and the bottom bracket 100, respectively. When the third locking mechanism is in the unlocked state, the locking teeth are engaged with the tooth grooves on one of the push down rod 3 and the bottom bracket 100, and are disengaged from the engagement of the tooth grooves of the other.

The push rod assembly further comprises a first unlocking mechanism, and when the second locking mechanism operates the first unlocking mechanism in a locking state, the second locking mechanism can be driven to unlock, so that the upper push rod 1 can slide downwards to be close to the middle push rod 2.

Specifically, as shown in fig. 3 to 6, the first unlocking mechanism includes an unlocking button 71, a second unlocking piece 72, and a pulling cable 73. The unlocking button 71 and the second unlocking piece 72 are both slidably arranged on the push rod 1, the second unlocking piece 72 is accommodated in the pipe cavity of the push rod 1, and the unlocking button 71 partially extends out of the push rod 1 so as to be conveniently operated by a human hand during unlocking. One end of the pulling rope 73 is directly or indirectly provided on the unlocking button 71, and the other end of the pulling rope 73 is provided on the second unlocking piece 72. In this embodiment, a fourth inclined surface 511a is disposed on the body 511 of the second locking member 51, a fifth inclined surface 721 corresponding to the fourth inclined surface 511a is disposed on the second unlocking member 72, the fourth inclined surface 511a and the fifth inclined surface 721 both obliquely intersect with the sliding direction of the second unlocking member 72, and the fourth inclined surface 511a and the fifth inclined surface 721 are in abutting engagement.

When the unlocking button 71 is operated by the second locking mechanism in the locked state, the second unlocking member 72 is pulled to slide upwards by the pulling rope 73, and the body 511 of the second locking member 51 swings relative to the push rod 1 through the abutting engagement of the fourth inclined surface 511a and the fifth inclined surface 721, so that the locking pin 512 is disengaged from the second locking groove 21, the second locking mechanism is unlocked, and the push rod 1 can slide downwards relative to the middle push rod 2 and close to the middle push rod 2.

The push rod assembly further includes a first unlocking member 81, and the first unlocking member 81 is disposed at a lower portion of the upper push rod 1. When the stroller is in the unfolded state, the first unlocking member 81 is away from the first locking member 4, as shown in fig. 3 to 6. When the upper push rod 1 slides downwards relative to the middle push rod 2 and approaches the middle push rod 2, the first unlocking piece 81 can be matched with the first locking piece 4, so that when the upper push rod 1 slides downwards, the first locking piece 4 can slide in the direction of being separated from the first locking groove 31, and the first locking mechanism is unlocked, and thus the unlocking operation of the first locking mechanism is convenient.

The first unlocking member 81 is rotatably provided at a lower portion of the upper push rod 1, and the first unlocking member 81 rotates with respect to the upper push rod 1 to have a first position and a second position.

The first unlocking piece 81 is abutted against the lower end part of the second unlocking piece 72. When the unlocking button 71 is operated to unlock the second locking mechanism, the first unlocking member 81 is driven to rotate to the first position relative to the push rod 1 by the cooperation of the first unlocking member 81 and the second unlocking member 72, as shown in fig. 5, 6, 11, 12, 18 and 19.

When the unlocking button 71 is released, the first unlocking member 81 is reversely rotated by the elastic force of the first elastic member 82, thereby being rotated from the first position to the second position, as shown in fig. 3, 4, 8, 9, 14 and 15. In this embodiment, the first elastic member 82 employs a torsion spring, one end of which is provided on the first unlocking member 81, and the other end of which is provided on the push-up lever 1.

When the push rod 1 slides down at the first position of the first unlocking member 81, the first unlocking member 81 can be matched with the first locking member 4, so that the first locking member 4 slides in the direction of being separated from the first locking groove 31, and the first locking mechanism is unlocked.

When the first unlocking member 81 is in the second position and the upper push rod 1 slides downward, the first locking member 4 cannot slide relative to the middle push rod 2, so that the first locking mechanism cannot be unlocked, and the locked state is maintained. Thus, when the child stroller is in use, after the unlocking button 71 is operated by mistake to unlock the second locking mechanism, the upper push rod 1 can slide downwards relative to the middle push rod 2 and close to the middle push rod 2, and when the unlocking button 71 is released in the process of sliding downwards the upper push rod 1, the first unlocking member 81 is located at the second position under the action of the elastic force of the first elastic member 82, and when the upper push rod 1 slides downwards relative to the middle push rod 2 for a certain distance, the first unlocking member 81 is abutted against the first locking member 4, so that the upper push rod 1 cannot slide downwards continuously, and the first locking member 4 cannot slide relative to the middle push rod 2, so that the first locking mechanism keeps in a locking state, and therefore, the middle push rod 2 cannot slide downwards, and the situation that the awning slides downwards and collides with a child riding in the child stroller can be avoided.

Specifically, the first unlocking member 81 is provided with an unlocking portion 811, and the first locking member 4 is provided with a first engagement portion 41 and a second engagement portion 42, respectively, and the distance between the first engagement portion 41 and the unlocking portion 811 is greater than the distance between the second engagement portion 42 and the unlocking portion 811. When the first unlocking piece 81 is at the first position, the position of the unlocking portion 811 corresponds to the position of the first fitting portion 41, as shown in fig. 11, 12, 18, and 19; when the first unlocking member 81 is at the second position, the position of the unlocking portion 811 corresponds to the position of the second engaging portion 42, as shown in fig. 8, 9, 14, and 15.

In this embodiment, the second engaging portion 42 is an upper end surface of the first locking member 4, and when the push-up lever 1 slides downward to make the unlocking portion 811 abut against the upper end surface of the first locking member 4, as shown in fig. 8, 9, 14 and 15, the push-up lever 1 cannot slide downward due to the blocking of the first locking member 4, and the first locking member 4 cannot slide.

In this embodiment, the first engaging portion 41 is a groove recessed from the upper end surface of the first locking member 4. The unlocking portion 811 has a first inclined surface 811a, and one side surface of the first fitting portion 41, i.e., the groove, is a second inclined surface 411 that matches the first inclined surface 811 a. When the push-up lever 1 slides down to bring the unlocking portion 811 into the groove, the first inclined surface 811a is fitted against the second inclined surface 411, as shown in fig. 11, 12, 18 and 19. This allows the upper push rod 1 to continue to slide downwardly in close proximity to the middle push rod 2 and allows the first locking member 4 to slide in a direction out of the first locking groove 31 until the upper push rod 1 slides downwardly in place, with the first locking mechanism unlocked.

That is, when the first locking mechanism needs to be unlocked when the stroller frame is folded, the unlocking button 71 needs to be operated during the downward sliding of the push-up lever 1, so that the first unlocking member 81 is driven to move to the first position by the second unlocking member 72.

As shown in fig. 14, 15, 18 and 19, the stroller further comprises a second unlocking mechanism 9, the second unlocking mechanism 9 being adapted to actuate the unlocking of the third locking mechanism. The second unlocking mechanism 9 is movably arranged in the pipe cavity of the lower push rod 3, when the middle push rod 2 slides downwards to be close to the lower push rod 3, the lower part of the middle push rod 2 can prop against the second unlocking mechanism 9, so that the second unlocking mechanism 9 acts, and then the third locking mechanism is unlocked, the unlocking operation of the third locking mechanism is convenient, and the folding of the baby carriage is convenient. The manner in which the unlocking of the third locking mechanism is actuated by the second unlocking mechanism 9 may employ a structure in the prior art.

The first locking grooves 31 are provided at the upper and lower end portions of the push down rod 3, respectively, and when the stroller is in the unfolded state, the first locking piece 4 is inserted into the first locking groove 31 located at the upper portion of the push down rod 3, thereby putting the first locking mechanism in the locked state. When the unlocking button 81 is released in the process that the push rod 2 slides down to approach the push rod 3, the first locking piece 4 can also be inserted into the first locking groove 31 at the lower part of the push rod 3, so that the first locking mechanism can be locked again.

In the push rod assembly, when the unlocking button 71 is released in the process of sliding the middle push rod 2 downward, the first unlocking member 81 is in the second position under the action of the elastic force of the first elastic member 82. When the middle push rod 2 slides down to the position of the first locking member 4 corresponding to the first locking groove 31 at the lower part of the lower push rod 3, the first locking member 4 is automatically inserted into the first locking groove 31 under the elastic force of the second elastic member, thereby locking the positions of the middle push rod 2 and the lower push rod 3, and the middle push rod 2 cannot slide down continuously, as shown in fig. 14 and 15. At this time, a space is provided between the lower part of the middle push rod 2 and the second unlocking mechanism 9, and the second unlocking mechanism 9 cannot be driven to act, so that the third locking mechanism still maintains the locked state. This prevents the third locking mechanism from unlocking when the middle push rod 2 is slid down by a malfunction, thereby rotating the push rod assembly relative to the bottom bracket 100, and the bars constituting the bottom bracket 100 can also be rotated and/or slid, so that the stroller frame is folded, which can improve the safety of the stroller.

When the third locking mechanism is required to be unlocked when the cart frame is folded, the unlocking button 71 is operated, the second unlocking piece 72 drives the first unlocking piece 81 to move to the first position, the middle push rod 2 can slide downwards continuously, the unlocking part 811 enters the groove, the first inclined surface 811a is matched with the second inclined surface 411 in a propping mode, the middle push rod 2 can slide downwards continuously to be close to the lower push rod 3, the first locking piece 4 can slide in the direction of being separated from the first locking groove 31 until the middle push rod 2 slides downwards to be in place, and the first locking mechanism is unlocked. During the process that the middle push rod 2 continues to slide downwards, the lower part of the middle push rod 2 is abutted against the second unlocking mechanism 9, so that the second unlocking mechanism 9 acts, and the third locking mechanism is unlocked.

As shown in fig. 14, 15, 18 and 19, the push rod assembly further includes a third unlocking member 32, and the third unlocking member 32 is fixedly disposed on the push rod 3 and is located at the position of the first locking groove 31 at the lower part of the push rod 3. The third unlocking piece 32 is provided with a third inclined surface 321, and when the first locking piece 4 is inserted into the first locking groove 31 positioned at the lower part of the push rod 3, the first locking piece 4 is abutted against the third inclined surface 321 to be matched. When the middle push rod 2 slides downwards to the first locking piece 4 inserted into the first locking groove 31 at the lower part of the lower push rod 3, and when the middle push rod 2 is pulled upwards, the first locking piece 4 can slide in the direction of being separated from the first locking groove 31 due to the abutting fit of the first locking piece 4 and the third inclined surface 321, so that the first locking mechanism is unlocked, and the middle push rod 2 can be pulled to slide upwards for resetting.

The above embodiments are provided to illustrate the technical concept and features of the present utility model and are intended to enable those skilled in the art to understand the content of the present utility model and implement the same, and are not intended to limit the scope of the present utility model. All equivalent changes or modifications made in accordance with the spirit of the present utility model should be construed to be included in the scope of the present utility model.

Claims (15)

1. The utility model provides a push rod subassembly, includes down the push rod, can follow the length extension direction of push rod is slided and is set up in the well push rod on the push rod of push rod down, can follow the length extension direction of well push rod is slided and is set up on the well push rod, be used for with the first locking mechanism of lower push rod with the relative position locking of well push rod, be used for with the second locking mechanism and the first unlocking mechanism of the relative position locking of well push rod with the last push rod, its characterized in that: the push rod assembly further comprises a first unlocking piece used for driving the first locking mechanism to unlock, the first unlocking piece can be rotatably arranged on the upper push rod and is matched with the first unlocking mechanism, and when the first unlocking mechanism is operated, the first unlocking piece is positioned at a first position and the second locking mechanism is unlocked; when the first unlocking mechanism is released, the first unlocking piece is in a second position; when the first unlocking piece is positioned at the second position and the upper push rod slides downwards to be close to the middle push rod, the first unlocking piece is matched with the first locking mechanism and cannot drive the first locking mechanism to unlock; when the first unlocking piece is positioned at the first position and the upper push rod slides downwards to be close to the middle push rod, the first unlocking piece is matched with the first locking mechanism to drive the first locking mechanism to be unlocked.

2. The pushrod assembly according to claim 1, wherein: the first locking mechanism comprises a first locking piece and a first locking groove, wherein the first locking piece is slidably arranged on one of the middle push rod and the lower push rod, and the first locking piece is arranged on the other, and can be inserted into the first locking groove or can be separated from the first locking groove; when the first unlocking piece is positioned at the second position and the upper push rod slides downwards, the first unlocking piece can be in propping fit with the first locking piece and cannot slide the first locking piece; when the first unlocking piece is positioned at the first position and the upper push rod slides downwards, the first unlocking piece can be in propping fit with the first locking piece to drive the first locking piece to slide.

3. The pushrod assembly according to claim 2, wherein: the first unlocking piece is provided with an unlocking part, and the first locking piece is respectively provided with a first matching part and a second matching part; when the first unlocking piece is positioned at a first position, the position of the unlocking part corresponds to the position of the first matching part, and when the upper push rod slides downwards, the first unlocking piece can be propped against the first matching part to be matched; when the first unlocking piece is positioned at the second position, the position of the unlocking part corresponds to the position of the second matching part, and when the upper push rod slides downwards, the first unlocking piece can be propped against the second matching part to be matched.

4. A putter assembly according to claim 3, wherein: the unlocking part is provided with a first inclined plane, the first matching part is provided with a second inclined plane matched with the first inclined plane, and when the first unlocking part is positioned at a first position, the first inclined plane can be matched with the second inclined plane in a propping way when the upper push rod slides downwards.

5. The pushrod assembly according to claim 4, wherein: the second matching part is the upper end face of the first locking piece, the first matching part is a groove which is downwards concave from the upper end face of the first locking piece, and the second inclined plane is one side face of the groove.

6. The pushrod assembly according to claim 1, wherein: the first unlocking mechanism comprises a second unlocking piece which can be arranged in the upper push rod in a sliding mode, the second unlocking piece is respectively matched with the first unlocking piece and the second locking mechanism in a propping mode, and when the second unlocking piece is driven to slide relative to the upper push rod to unlock the second locking mechanism, the first unlocking piece rotates from a second position to a first position relative to the upper push rod.

7. The pushrod assembly according to claim 6, wherein: the first unlocking mechanism further comprises an unlocking button arranged on the upper push rod and a traction rope with one end part directly or indirectly arranged on the unlocking button, and the other end part of the traction rope is arranged on the second unlocking piece.

8. The pushrod assembly according to claim 1, wherein: the push rod assembly further includes a first resilient member for urging the first unlocking member to rotate from the first position to the second position.

9. The pushrod assembly according to claim 1, wherein: the second locking mechanism comprises a second locking piece movably arranged on the upper push rod and a second locking groove arranged on the middle push rod, and the second locking piece can be inserted into the second locking groove or separated from the second locking groove.

10. The pushrod assembly according to claim 9, wherein: the first unlocking mechanism comprises a second unlocking piece which can be arranged in the upper push rod in a sliding mode, and the second unlocking piece is in propping fit with the second locking piece.

11. The pushrod assembly according to claim 10, wherein: the second locking piece comprises an elastic body part and a locking pin arranged at one end part of the body part, the locking pin can be inserted into or separated from the second locking groove, and the second unlocking piece is propped against the body part through an inclined plane to be matched.

12. A child stroller, characterized in that: a push rod assembly according to any one of claims 1 to 11.

13. The stroller of claim 12, wherein: the child stroller further comprises a bottom bracket, the push rod assembly can be rotatably arranged on the bottom bracket, the child stroller further comprises a third locking mechanism for locking the relative positions of the push rod assembly and the bottom bracket, and a second unlocking mechanism movably arranged on the lower push rod and used for driving the third locking mechanism to unlock, when the middle push rod slides downwards and is close to the lower push rod, the middle push rod can be matched with the second unlocking mechanism so as to drive the second unlocking mechanism to act to unlock the third locking mechanism.

14. The stroller of claim 13, wherein: the first locking mechanism comprises a first locking piece and a first locking groove, wherein the first locking piece can be arranged on the middle push rod in a sliding mode, the first locking groove is arranged on the lower push rod in a sliding mode, the first locking piece can be inserted into the first locking groove or separated from the first locking groove, the first locking groove is respectively arranged at the upper end portion and the lower end portion of the lower push rod, when the push rod assembly is in a unfolding state, the first locking piece is inserted into the first locking groove at the upper portion, and when the middle push rod slides downwards to be close to the lower push rod, the first locking piece can be inserted into the first locking groove at the lower portion, so that the middle push rod cannot slide downwards to be matched with the second unlocking mechanism.

15. The stroller of claim 14, wherein: the push rod assembly further comprises a third unlocking piece which is fixedly arranged on the lower push rod and located at the position of the first locking groove at the lower part, a third inclined surface is arranged on the third unlocking piece, and when the first locking piece is inserted into the first locking groove at the lower part, the first locking piece is in propping fit with the third inclined surface.