A cart

Abstract

The application discloses a cart, which comprises a main support, a push rod rotatably connected with the main support through a rotating shaft, a locking mechanism for locking the relative position of the main support and the push rod, the locking mechanism comprising a locking piece rotatably arranged between the main support and the push rod, the locking piece comprising a locking portion, the locking portion having a first taper surface and a second taper surface arranged concentrically, the push rod being provided with a third taper surface, the main support being provided with a fourth taper surface, the first taper surface having the same taper as the third taper surface, the second taper surface having the same taper as the fourth taper surface, when the locking mechanism is in a locked state, one taper surface is in abutting engagement with the third taper surface, and the second taper surface is in abutting engagement with the fourth taper surface, so that the locking portion is pressed between the main support and the push rod, when the locking mechanism is in an unlocked state, the first taper surface is disengaged from the third taper surface, and / or the second taper surface is disengaged from the fourth taper surface. The push rod of the cart can be adjusted steplessly, and the push rod is not prone to shaking when the locking mechanism is in the locked state.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of stroller, in particular to a stroller. BACKGROUND

[0002] The general stroller includes a main frame and a push rod arranged on the main frame, the push rod is used for pushing the stroller during use. The push rod can generally rotate relative to the main frame, so that the push rod can rotate relative to the main frame to fold the stroller. At the same time, the stroller can also rotate the push rod relative to the main frame to adjust the height of the push rod when unfolded, so that the stroller can be suitable for different people to use. When the push rod is adjusted in place, the relative position of the push rod needs to be locked by a locking mechanism, and the stroller can be used.

[0003] In the prior art, the locking mechanism generally adopts the locking form of the bell, such as the bell disclosed in Chinese patent CN2013203693718, which has the following features: the rotating connection between the push rod and the front support is provided with a bell, the bell includes a first bell cover and a second bell cover which can rotate relative to each other, a bell saw gear which is arranged between the first bell cover and the second bell cover and can move along the axial direction, one of the first bell cover and the second bell cover is fixedly arranged on the push rod, and the other is fixedly arranged on the front support, the bell saw gear has at least one wheel saw tooth which protrudes outward in the radial direction, the first bell cover and the second bell cover are respectively provided with a first sliding groove and a second sliding groove which can be inserted by the wheel saw tooth in the axial direction, an elastic element is arranged between the first bell cover and the bell saw gear to provide elastic recovery force of the bell saw gear in the axial direction, the bell has a locking state and an unlocking state, when the bell is in the locking state, the two ends of the wheel saw tooth are respectively accommodated in the first sliding groove and the second sliding groove; when the bell is in the unlocking state, the wheel saw tooth is accommodated in the first sliding groove. This locking mode can only adjust the push rod to the set position, and cannot realize stepless adjustment. Moreover, in the locking state, there is a gap between the first bell cover and the bell saw gear, and between the second bell cover and the bell saw gear in the radial direction, so that the push rod is easy to shake. SUMMARY

[0004] The purpose of the present application is to overcome the shortcomings of the prior art, and to provide a stroller which can steplessly adjust the push rod and prevent the push rod from shaking when the locking mechanism is in the locking state.

[0005] To achieve the above purpose, the technical solution adopted by the present application is:

[0006] A cart comprises a main support and a push rod rotatably connected with the main support through a rotation shaft, and further comprises a locking mechanism for locking relative positions of the main support and the push rod, the locking mechanism comprising a locking piece rotatably arranged between the main support and the push rod about the rotation shaft, the locking piece comprising a locking portion with a first taper and a second taper arranged concentrically, the push rod being provided with a third taper, the main support being provided with a fourth taper, the first taper having the same taper as the third taper, the second taper having the same taper as the fourth taper, the first taper and the third taper being in abutting engagement when the locking mechanism is in a locked state, the second taper and the fourth taper being in abutting engagement, so that the locking portion is pressed between the main support and the push rod, the first taper and the third taper being disengaged when the locking mechanism is in an unlocked state, and / or the second taper and the fourth taper being disengaged.

[0007] Preferably, the first taper is provided with a first sawtooth, the second taper is provided with a second sawtooth, the third taper is provided with a third sawtooth, and the fourth taper is provided with a fourth sawtooth, the first sawtooth and the third sawtooth being in engagement when the locking mechanism is in the locked state, the second sawtooth and the fourth sawtooth being in engagement, the first sawtooth and the third sawtooth being disengaged when the locking mechanism is in the unlocked state, and / or the second sawtooth and the fourth sawtooth being disengaged.

[0008] Further, the push rod is slidably arranged on the main support along an axial direction of the rotation shaft, the push rod being capable of sliding relative to the main support to engage the first sawtooth with the third sawtooth or disengage the first sawtooth from the third sawtooth.

[0009] Further, one of the push rod and the locking piece is provided with a protrusion, and the other is provided with a groove matched with the protrusion, the groove extending along a sliding direction of the push rod, the protrusion being arranged in the groove and being slidably arranged along a length direction of the groove, the push rod being capable of driving the locking piece to rotate relative to the main support when the first sawtooth is disengaged from the third sawtooth.

[0010] Further, the locking piece is slidably arranged along an axial direction of the rotation shaft, the locking piece being capable of sliding relative to the main support and alternately engaging and disengaging the second sawtooth from the fourth sawtooth when the locking mechanism is in the unlocked state and the locking piece rotates about the rotation shaft.

[0011] Preferably, the push rod is slidably arranged on the main support along the axial direction of the rotating shaft, and the push rod is capable of sliding relative to the main support to lock and unlock the locking mechanism.

[0012] Further, the operating member is also slidably arranged on the main support along the axial direction of the rotating shaft, and the operating member cooperates with the main support.

[0013] Further, the main support is provided with a first inclined surface, and the operating member is provided with a second inclined surface cooperating with the first inclined surface, and when the locking mechanism is in the unlocked state, the first inclined surface cooperates with the second inclined surface.

[0014] Further, the operating member has a first end surface, and the push rod assembly has a second end surface, and the first end surface and the second end surface are both perpendicular to the sliding direction of the operating member, and the first end surface cooperates with the second end surface.

[0015] Further, the stroller further comprises an elastic member, one end of the elastic member is arranged on the push rod, and the other end of the elastic member is arranged on the locking member.

[0016] Thanks to the above technical scheme, the stroller of the present application has the following advantages compared with the prior art: when the push rod is rotated relative to the main support to any position, the position of the push rod can be locked through the cooperation between the push rod and the locking member and between the locking member and the main support, so that the stepless adjustment of the position of the push rod can be realized, and the use of the stroller is facilitated. Moreover, when the position of the push rod is locked through the locking mechanism, the locking member is pressed between the push rod and the main support through the cooperation between the push rod and the locking member and between the locking member and the main support, which can eliminate the radial clearance between the locking member and the push rod and between the locking member and the main support, so that the push rod will not shake when the stroller is unfolded and used, and the stability of the stroller is better. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a perspective view of the stroller of the present embodiment in the folded state (the locking mechanism is in the locked state); Figure 1 Figure 2 is a perspective view of the stroller of the present embodiment in the unfolded state (the locking mechanism is in the unlocked state);

[0018] Figure 2 Figure 3 is a perspective view of the connection part between the push rod and the main support of the stroller of the present embodiment in the unfolded state (the locking mechanism is in the locked state);

[0019] Figure 4 is a perspective view of the connection part between the push rod and the main support of the stroller of the present embodiment in the unfolded state (the locking mechanism is in the unlocked state); Figure 3 ​Fig. 6 is a partial cross-sectional view of the connection between the push bar and the main support of the cart of this embodiment in the unfolded state (the locking mechanism is in the locked state);

[0020] Fig. 7 is a partial enlarged view of portion A in Fig. 6; Figure 4 Figure 3 Fig. 8 is a perspective view of the cart of this embodiment in the unfolded state (the locking mechanism is in the unlocked state);

[0021] Fig. 9 is a perspective view of the connection between the push bar and the main support of the cart of this embodiment in the unfolded state (the locking mechanism is in the unlocked state); Figure 5 Fig. 10 is a partial cross-sectional view of the connection between the push bar and the main support of the cart of this embodiment in the unfolded state (the locking mechanism is in the unlocked state);

[0022] Figure 6 Fig. 11 is a partial enlarged view of portion A in Fig. 10;

[0023] Fig. 12 is one of the exploded views of the connection between the push bar and the main support of the cart of this embodiment in the unfolded state; Figure 7 Fig. 13 is a partial cross-sectional view of the connection between the push bar and the main support of the cart of this embodiment in the unfolded state (the locking mechanism is in the unlocked state);

[0024] Figure 8 Fig. 14 is a partial enlarged view of portion A in Fig. 13; Figure 7 Fig. 15 is one of the exploded views of the connection between the push bar and the main support of the cart of this embodiment in the unfolded state;

[0025] Figure 9 Fig. 16 is a perspective view of the cart of this embodiment when the push bar is in the folded position;

[0026] Fig. 17 is a perspective view of the connection between the push bar and the main support of the cart of this embodiment when the push bar is in the folded position (the locking mechanism is in the locked state); Figure 10 Fig. 18 is a partial cross-sectional view of the connection between the push bar and the main support of the cart of this embodiment when the push bar is in the folded position (the locking mechanism is in the locked state);

[0027] Figure 11 Fig. 19 is a partial enlarged view of portion A in Fig. 18;

[0028] Fig. 20 is one of the exploded views of the connection between the push bar and the main support of the cart of this embodiment when the push bar is in the folded position; Figure 12 Figure 11 Fig. 21 is a partial enlarged view of portion A in Fig. 20;

[0029] Fig. 22 is one of the exploded views of the connection between the push bar and the main support of the cart of this embodiment when the push bar is in the folded position; Figure 13 Fig. 23 is a partial enlarged view of portion A in Fig. 22;

[0030] Figure 14 Fig. 24 is one of the exploded views of the connection between the push bar and the main support of the cart of this embodiment when the push bar is in the folded position;

[0031] ​​​​​​​Wherein: 1, main support; 11, fourth taper; 111, fourth sawtooth; 12, end cover; 121, first inclined surface; 2, push rod; 21, third taper; 211, third sawtooth; 22, second end surface; 23, convex part; 3, rotating shaft; 4, front wheel assembly; 5, rear wheel assembly; 6, locking member; 61, locking part; 611, first taper; 611a, first sawtooth; 612, second taper; 62, groove; 7, operating member; 71, second inclined surface; 72, first end surface; 8, elastic member. DETAILED DESCRIPTION

[0032] The technical solutions of the present application will be further described below in combination with the drawings and specific embodiments.

[0033] As shown in Figure 1 , Figure 5 and Figure 9 , the stroller of the present application comprises a stroller frame, a front wheel assembly 4 arranged at the bottom front part of the stroller frame, and a rear wheel assembly 5 arranged at the bottom rear part of the stroller frame.

[0034] The stroller frame comprises a main support 1 and a push rod 2. The front wheel assembly 4 is arranged at the bottom front part of the main support 1, and the rear wheel assembly 5 is arranged at the bottom rear part of the main support 1.

[0035] The push rod 2 is rotatably connected to the main support 1 around a rotating shaft 3, the rotating shaft 3 extends in the left-right direction, and the push rod 2 can rotate around the rotating shaft 3, so as to unfold and fold the stroller, as shown in Figure 1 and Figure 9 . When the stroller is in the unfolded state, the push rod 2 can also rotate around the rotating shaft 3 to adjust the height position of the push rod 2.

[0036] The stroller further comprises a locking mechanism for locking the position of the push rod 2 when the stroller is used in the unfolded state. After the locking mechanism is unlocked, the push rod 2 can rotate relative to the main support 1, so as to adjust the position of the push rod 2, or fold the stroller.

[0037] As shown in Figure 4 , Figure 5 , Figure 7 , Figure 8 , Figures 11-14 , the locking mechanism comprises a locking member 6 rotatably arranged between the main support 1 and the push rod 2 around the rotating shaft 3. The locking member 6 comprises a locking part 61 having a first taper 611 and a second taper 612 arranged concentrically, the push rod 2 is provided with a third taper 21, the main support 1 is provided with a fourth taper 11, the first taper 611 has the same taper as the third taper 21, and the second taper 612 has the same taper as the fourth taper 11.

[0038] When the locking mechanism is in the locked state, the first conical surface 611 abuts against the third conical surface 21, and the second conical surface 612 abuts against the fourth conical surface 11, so that the locking part 61 is pressed between the main bracket 1 and the push rod 2. Figure 4 and Figure 5 As shown. The friction between the push rod 2 and the locking part 61, as well as the friction between the main support 1 and the locking part 61, fixes the push rod 2 to the main support 1, preventing it from rotating relative to the main support 1. This locking method allows the push rod 2 to be locked at any position in its circumferential direction of rotation, thus achieving stepless adjustment of the push rod 2's position. Furthermore, in each locked position, there is no radial clearance between the locking part 6 and the push rod 2, or between the locking part 6 and the main support 1, ensuring that the push rod 2 does not wobble when the trolley is unfolded and used, resulting in good trolley stability.

[0039] In this embodiment, the first conical surface 611 and the fourth conical surface 11 are outer conical surfaces, and the second conical surface 612 and the third conical surface 21 are inner conical surfaces.

[0040] When the locking mechanism is in the unlocked state, the first conical surface 611 disengages from the third conical surface 21, or the second conical surface 612 disengages from the fourth conical surface 11, or both the first conical surface 611 and the third conical surface 21, and the second conical surface 612 and the fourth conical surface 11, are disengaged. Figure 7 , Figure 8 , Figure 11 and Figure 12 As shown, at this time, push rod 2 can rotate around pivot 3 to adjust its position, or fold the trolley.

[0041] In this embodiment, as Figure 13 and Figure 14 As shown, a first serration 611a is provided on the first conical surface 611, a second serration 612a is provided on the second conical surface 612, a third serration 211 is provided on the third conical surface 21, and a fourth serration 111 is provided on the fourth conical surface 11. When the locking mechanism is in the locked state, the first serration 611a engages with the third serration 211, and the second serration 612a engages with the fourth serration 111. When the locking mechanism is in the unlocked state, the first serration 611a disengages from the third serration 211, and / or the second serration 612a disengages from the fourth serration 111. Thus, when the locking mechanism is in the locked state, the meshing of the first sawtooth 611a with the third sawtooth 211, and the meshing of the second sawtooth 612a with the fourth sawtooth 111, increases the friction between the first conical surface 611 and the third conical surface 21, and between the second conical surface 612 and the fourth conical surface 11, resulting in better stability of the locking mechanism in the locked state. When adjusting the position of the push rod 2, the tooth pitches of the first sawtooth 611a, the second sawtooth 612a, the third sawtooth 211, and the fourth sawtooth 111 are all small, allowing the push rod 2 to be adjusted approximately steplessly.

[0042] The push rod 2 is also capable of sliding relative to the main support 1 along the axis direction of the rotation shaft 3. When the locking mechanism is in the locked state, the push rod 2 slides relative to the main support 1 in the first direction E, so that the first sawtooth 611a is disengaged from the third sawtooth 211, thereby unlocking the locking mechanism. When the locking mechanism is in the unlocked state, the push rod 2 slides relative to the main support 1 in the second direction F opposite to the first direction E, so that the first sawtooth 611a is engaged with the third sawtooth 211, thereby locking the locking mechanism.

[0043] The trolley further comprises an operating member 7 and an elastic member 8. The operating member 7 is sleeved on the rotation shaft 3 and is capable of rotating about the rotation shaft 3. One end of the elastic member 8 is arranged on the push rod 2, and the other end of the elastic member 8 is arranged on the locking member 6.

[0044] When the locking mechanism is in the unlocked state and the operating member 7 is rotated forward, the push rod 2 is driven to slide relative to the main support 1 in the second direction F, thereby locking the locking mechanism. When the locking mechanism is in the locked state and the operating member 7 is rotated reversely about the rotation shaft 3, the push rod 2 is driven to slide relative to the main support 1 in the first direction E by the elastic force of the elastic member 8, thereby unlocking the locking mechanism.

[0045] Specifically, the operating member 7 is also capable of sliding along the axis direction of the rotation shaft 3, and the operating member 7 cooperates with the main support 1 and the push rod 2 respectively. When the locking mechanism is in the unlocked state and the operating member 7 is rotated forward, the operating member 7 is driven to slide in the second direction F simultaneously by the cooperation between the operating member 7 and the main support 1, and the push rod 2 is driven to slide in the same direction synchronously by the cooperation between the operating member 7 and the push rod 2. When the locking mechanism is in the locked state and the operating member 7 is rotated reversely, the push rod 2 is driven to slide in the first direction E by the elastic force of the elastic member 8, thereby driving the operating member 7 to slide in the first direction E synchronously.

[0046] As shown in Figure 13 and Figure 14 , the main support 1 comprises an end cover 12, and the end cover 12 is provided with a first inclined surface 121. The operating member 7 is provided with a second inclined surface 71 cooperating with the first inclined surface 121. When the locking mechanism is in the unlocked state, the first inclined surface 121 cooperates with the second inclined surface 71. At this time, when the operating member 7 is rotated forward about the rotation shaft 3, the operating member 7 is driven to slide in the second direction F simultaneously due to the cooperation between the first inclined surface 121 and the second inclined surface 71.

[0047] As shown in Figure 4 , Figure 5 , Figure 7 , Figure 8 , Figure 11 and Figure 12As shown, the operating member 7 has a first end surface 72, and the push rod assembly 2 has a second end surface 22, both of which are perpendicular to the sliding direction of the operating member 7, and the first end surface 72 is in abutting engagement with the second end surface 22. In this way, when one of the operating member 7 and the push rod assembly 2 slides, the other one is driven to slide in the same direction synchronously.

[0048] As shown in Figure 13 and Figure 14 , one of the push rod 2 and the locking member 6 is provided with a protrusion 23, and the other one is provided with a groove 62 which is in engagement with the protrusion 23 and extends along the sliding direction of the push rod 2, and the protrusion 23 is located in the groove 62 and can slide along the length direction of the groove 62. In this way, when the push rod 2 slides in the second direction F to unlock the locking mechanism, the protrusion 23 slides in the groove 62, but they are still in the engaged state, so that when the push rod 2 rotates around the rotation shaft 3 relative to the main support 1 to adjust the position or fold, the locking member 6 is driven to rotate around the rotation shaft 3 relative to the main support 1 synchronously.

[0049] The locking member 6 is also slidably arranged along the axis direction of the rotation shaft 3. When the locking member 6 is driven by the push rod 2 to rotate around the rotation shaft 3, the second sawtooth 612a and the fourth sawtooth 111 are alternately engaged and disengaged. In this process, due to the engagement of the second sawtooth 612a and the fourth sawtooth 111, the locking member 6 slides relative to the main support 1, and under the action of the elastic force of the elastic member 8, the locking member 6 reversely slides to reset.

[0050] When the stroller is in the unfolded state, the locking mechanism is in the locked state, that is, the first sawtooth 611a and the third sawtooth 211 are engaged, and the second sawtooth 612a and the fourth sawtooth 111 are engaged, so as to lock the position of the push rod 2, and at this time, the elastic member 8 is in the compressed state, as shown in Figures 1-4 .

[0051] When it is necessary to adjust the position of the push rod 2 or fold the stroller, the locking mechanism needs to be unlocked, and the specific operation method is as follows:

[0052] Reverse rotation of the operating member 7, the abutting effect of the end cover 12 on the operating member 7 is eliminated, and the elastic force generated by the elastic deformation of the elastic member 8 drives the push rod 2 to slide in the first direction E, and the operating member 7 slides in the same direction synchronously until the first sawtooth 611a and the third sawtooth 211 are disengaged, and the locking mechanism is unlocked, as shown in Figures 5-8 . At this time, the push rod 2 can be rotated relative to the main support 1.

[0053] When the push rod 2 is rotated to adjust the position relative to the main support 1, the locking member 6 is rotated synchronously, and in the process of rotating the locking member 6, the locking member 6 slides back and forth along the axis of the rotating shaft 3, so that the second sawtooth 612a and the fourth sawtooth 111 are alternately engaged and disengaged. When the locking member 6 is rotated to the position where the second sawtooth 612a and the fourth sawtooth 111 are engaged, a clicking sound will be produced due to the tooth contact. When the push rod 2 is rotated to the appropriate position, the position of the push rod 2 can be fixed by locking the locking mechanism again according to the sound.

[0054] When the locking mechanism is locked again, the forward rotating operation member 7 is operated, and through the slope matching between the operation member 7 and the end cover 12, the operation member 7 is driven to slide in the second direction F, and the operation member 7 is pushed to slide in the same direction synchronously until the first sawtooth 611a and the third sawtooth 211 are engaged again, so that the locking mechanism is locked and the position of the push rod 2 is fixed.

[0055] After the locking mechanism is unlocked, the push rod 2 can also be rotated to approach the main support 1, so that the stroller is folded, as shown in Figures 9-12

[0056] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.​

Claims

1. A cart comprising a main support and a push bar rotatably connected to the main support by a pivot, characterized in that: The stroller further comprises a locking mechanism for locking the relative position of the main support and the push rod, the locking mechanism comprising a locking piece rotatably arranged between the main support and the push rod about the rotation shaft, the locking piece comprising a locking portion having a first taper and a second taper arranged concentrically, the push rod being provided with a third taper, the main support being provided with a fourth taper, the first taper having the same taper as the third taper, the second taper having the same taper as the fourth taper, when the locking mechanism is in the locked state, the first taper and the third taper abut and engage each other, the second taper and the fourth taper abut and engage each other, so that the locking portion is pressed between the main support and the push rod, when the locking mechanism is in the unlocked state, the first taper and the third taper disengage each other, and / or the second taper and the fourth taper disengage each other; The first taper is provided with a first sawtooth, the second taper is provided with a second sawtooth, the third taper is provided with a third sawtooth, and the fourth taper is provided with a fourth sawtooth, when the locking mechanism is in the locked state, the first sawtooth and the third sawtooth engage each other, and the second sawtooth and the fourth sawtooth engage each other, when the locking mechanism is in the unlocked state, the first sawtooth and the third sawtooth disengage each other, and / or the second sawtooth and the fourth sawtooth disengage each other; The push rod is slidably arranged on the main support along the axis direction of the rotation shaft, the push rod can slide relative to the main support to make the first sawtooth engage or disengage the third sawtooth.

2. The cart of claim 1, wherein: One of the push rod and the locking piece is provided with a protrusion, and the other is provided with a groove matched with the protrusion, the groove extending along the sliding direction of the push rod, the protrusion being clamped in the groove and being slidably arranged along the length direction of the groove, when the first sawtooth and the third sawtooth disengage each other, the rotation of the push rod relative to the main support can drive the locking piece to rotate relative to the main support synchronously.

3. The cart of claim 1, wherein: The locking piece is slidably arranged along the axis direction of the rotation shaft, when the locking mechanism is in the unlocked state and the locking piece rotates about the rotation shaft, the locking piece can slide relative to the main support and make the second sawtooth and the fourth sawtooth engage or disengage each other alternately.

4. The cart of claim 1, wherein: The stroller further comprises an operating piece for driving the push rod to slide relative to the main support, the operating piece being rotatably arranged on the main support, the operating piece being matched with the push rod.

5. The cart of claim 4, wherein: The operating piece is also slidably arranged on the main support along the axis direction of the rotation shaft, the operating piece being matched with the main support.

6. The cart of claim 5, wherein: The main support is provided with a first inclined surface, and the operating piece is provided with a second inclined surface matched with the first inclined surface, when the locking mechanism is in the unlocked state, the first inclined surface and the second inclined surface abut and engage each other.

7. The cart of claim 5, wherein: The operation member has a first end surface, the push rod assembly has a second end surface, the first end surface and the second end surface are both perpendicular to the sliding direction of the operation member, and the first end surface is in abutting engagement with the second end surface.

8. The cart of claim 5, wherein: The trolley further comprises an elastic member, one end of the elastic member is arranged on the push rod, and the other end of the elastic member is arranged on the locking member.

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