Folding cart chassis having single open side

Abstract

The invention relates to a folding cart chassis having a single open side. The chassis comprises a front frame, a rear frame, a single side frame, and a bottom frame; the front frame and the rear frame are respectively connected to the front side and the rear side of the bottom frame; the front side and the rear side of the single side frame are respectively connected to the left side of the front frame and the left side of the rear frame; the bottom frame and the single side frame are foldable structures that move in unison, and the bottom frame is provided with a limiting mechanism used for allowing the folding cart frame body to retain an unfolded state when unfolded. By means of only providing a single side frame, the folding cart can be used for both placing objects and carrying people, where people can sit on the open side of the folding cart and lean against the single side frame, thereby improving comfort and safety when sitting; also, even if a table top is placed on the front frame and the rear frame, objects can still be retrieved via the open side of the folding cart, providing convenience during use. Therefore, the technical problem in the prior art where folding carts are unable to both allow comfort and safety when carrying people and provide convenience when retrieving objects is solved.

Description

A folding cart frame with one side open Technical Field

[0001] The present invention relates to the technical field of folding carts, and in particular to a folding cart frame with a single-side open structure. Background Art

[0002] Currently, there are two main types of folding stroller frames: one with a closed or semi-enclosed design on all sides, such as those disclosed in Chinese patents CN209700727U and CN207416897U; and one with open sides and closed or semi-enclosed front and back, such as those disclosed in Chinese patent CN215284881U. The first type, with its closed frame, cannot accommodate side seating. Furthermore, when the panel is laid flat on the stroller, the closed frame requires the user to remove the tabletop before accessing items, making it very inconvenient. While the second type allows for seating, the open frame on both sides means that when a person sits on one side, the back is open, providing no support and resulting in poor comfort. This also poses a safety hazard of falling backwards.

[0003] Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a folding stroller frame with a single-side open structure to solve the technical problem that the folding strollers in the prior art cannot take into account both the comfort and safety of the passengers and the convenience of taking out items.

[0005] In order to solve the above technical problems, the present invention provides a folding cart frame with a single side open, comprising a front frame, a rear frame, a single side frame and a bottom frame, the front frame and the rear frame are respectively connected to the front and rear sides of the bottom frame, the front and rear sides of the single side frame are respectively connected to the left side of the front frame and the left side of the rear frame, the bottom frame and the single side frame are both foldable structures that are interconnected, and the bottom frame is provided with a limiting mechanism for keeping the folding cart frame in the unfolded state when unfolded.

[0006] After adopting the above structure, the folding cart frame with one side open of the present invention has the following advantages: by only providing a single-side frame, the folding cart can not only be used to place items, but also can be used for people to sit. People can sit on the open side of the folding cart and lean their backs against the single-side frame, which improves the comfort and safety of people when sitting. Even after placing a table top on the front frame and the rear frame, items can still be taken from the open side of the folding cart, which is convenient to use.

[0007] As an improvement, the bottom frame includes a first frame and a second frame, one end of the first frame is hinged to the bottom end of the front frame, the other end of the first frame is hinged to one end of the second frame, and the other end of the second frame is hinged to the bottom end of the rear frame. The limiting mechanism includes a baffle arranged on the other end of the first frame. When the folding cart frame is in the unfolded state, the baffle is against one end of the second frame and prevents one end of the second frame and the other end of the first frame from rotating downward. When folding is required, the other end of the first frame and one end of the second frame are rotated upward. With this structure, when folding, the hinge between the first frame and the second frame is lifted upward, and the first frame and the second frame are folded together, making the folding operation convenient.

[0008] As an improvement, the single-side frame includes several first scissor-type hinges, which are hinged front to back in sequence. The upper end of the first scissor-type hinge located on the front side is hinged to the front frame, and the lower end of the scissor-type hinge rod located on the front side is hinged to the first slider slidably connected to the front frame. The upper end of the first scissor-type hinge located on the rear side is hinged to the rear frame, and the lower end of the scissor-type hinge rod located on the rear side is hinged to the second slider slidably connected to the rear frame.

[0009] As an improvement, the upper ends of the first scissor-type hinges located at the frontmost and rearmost sides each have a first bent section, and the first bent section is hinged to the upper right side of the front frame and the rear frame respectively; with this structure, since one side of the entire cart frame is an open design without rigid support, when the upper end of the opening part on the right side of the front frame or the rear frame is subjected to an outward force along the vehicle body, such as when too many items are transported or a person sits on the bottom frame and places his palm on the upper end of the opening part on the right side of the front frame or the rear frame, the front frame or the rear frame is easily damaged. At this time, the first bent section hinged to the upper right side of the front frame and the rear frame is provided at the upper end of the first scissor-type hinges on the frontmost and rearmost sides, which can better strengthen the front frame and the rear frame.

[0010] As an improvement, the bottom frame includes a connecting block and four first connecting rods, the projection of the connecting block on the horizontal plane falls at the center of the bottom frame, one end of the four first connecting rods are hinged to the connecting block, and the other ends of the four first connecting rods are obliquely arranged and hinged to the left and right sides of the bottom end of the front frame and the left and right sides of the bottom end of the rear frame respectively, the front frame and the rear frame are both foldable structures foldable along the left and right directions, the limiting mechanism includes a baffle connected to the upper end face of the connecting block, when the folding cart frame is in the unfolded state, the upper end face of one end of each first connecting rod is against the baffle, so that one end of each first connecting rod cannot rotate downward, and when folding is required, one end of each first connecting rod rotates upward; with this structure, the bottom frame, single-side frame, front frame and rear frame all adopt a foldable structure, which also makes the left and right width of the cart smaller after folding and the structure more compact.

[0011] As an improvement, the front frame includes two first columns and several second scissor-type hinges, and the several second scissor-type hinges are hinged left and right in sequence. The upper end of the second scissor-type hinge located on the far left is hinged to the first column located on the left, and the lower end of the second scissor-type hinge located on the far left is hinged to the first slider slidably connected to the first column located on the left, the upper end of the second scissor-type hinge located on the far right is hinged to the first column located on the right, and the lower end of the second scissor-type hinge located on the far right is hinged to the third slider slidably connected to the first column located on the right. Hinge, the rear frame includes two second columns and several third scissor-type hinges, and the several third scissor-type hinges are hinged left and right in sequence. The upper end of the third scissor-type hinge located on the far left is hinged to the second column located on the left, and the lower end of the third scissor-type hinge located on the far left is hinged to the second slider slidably connected to the second column located on the left, the upper end of the third scissor-type hinge located on the far right is hinged to the second column located on the right, and the lower end of the third scissor-type hinge located on the far right is hinged to the fourth slider slidably connected to the second column located on the right.

[0012] As an improvement, the single side frame includes two second links and two third links. The two second links are cross-arranged and hinged to each other. One end of one of the third links is hinged to the upper end of the second link among the two second links, whose upper end is close to the front frame, and the other end is hinged to the front frame. One end of the other third link is hinged to the upper end of the second link among the two second links, whose upper end is close to the rear frame, and the other end is hinged to the rear frame.

[0013] As an improvement, the other ends of the two third connecting rods are bent to the right to extend to form a second bent section, and the second bent section is hinged to the right upper end of the front frame and the rear frame respectively; with this structure, since one side of the entire cart frame is an open design without rigid support, when the upper end of the right opening of the front frame or the rear frame is subjected to an outward force along the vehicle body, such as when too many items are transported or a person sits on the bottom frame and places his palm on the upper end of the right opening of the front frame or the rear frame, it is easy to damage the front frame or the rear frame. At this time, a second bent section hinged to the right upper end of the front frame and the rear frame is provided at the other ends of the two third connecting rods, which can better strengthen the front frame and the rear frame.

[0014] As an improvement, the present invention also includes a desktop panel placed on the front frame and the rear frame; with this structure, it is convenient to place items on the desktop panel, and when the desktop panel is placed, items can still be taken from the open side of the folding cart, which is convenient to use.

[0015] As an improvement, the front frame is connected to a push-pull rod, which is hinged to the front frame, and the bottom ends of the front frame and the rear frame are connected to rollers; this structure makes it easier to move the cart and saves effort when moving. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] FIG1 is a schematic diagram of the overall three-dimensional structure when no desktop panel is placed in the first embodiment of the present invention.

[0017] FIG2 is a schematic diagram of the overall three-dimensional structure when the desktop panel is placed in the first embodiment of the present invention.

[0018] FIG3 is a schematic diagram of the overall three-dimensional structure of the first embodiment of the present invention when folded.

[0019] FIG4 is a schematic diagram of the overall three-dimensional structure of the second embodiment of the present invention.

[0020] FIG5 is a schematic diagram of the overall three-dimensional structure of the second embodiment of the present invention when folded.

[0021] FIG6 is a schematic diagram of the overall three-dimensional structure of the third embodiment of the present invention.

[0022] FIG7 is a schematic diagram of the overall three-dimensional structure of the third embodiment of the present invention when folded.

[0023] Figure markings: 100, front frame; 200, rear frame; 300, single-side frame; 400, bottom frame; 500, push-pull rod; 600, roller; 700, desktop panel; 1, first frame; 2, second frame; 3, first scissor-type hinge; 31, first bending section; 4, first slider; 5, second slider; 6, connecting block; 7, first connecting rod; 8, first column; 9, second scissor-type hinge; 10, third slider; 11, second column; 12, third scissor-type hinge; 13, fourth slider; 14, second connecting rod; 15, third connecting rod; 151, second bending section. DETAILED DESCRIPTION

[0024] The following is a detailed description of a folding cart frame with one side open according to the present invention with reference to the accompanying drawings.

[0025] Example 1:

[0026] As shown in Figures 1 to 3, this embodiment provides a folding stroller frame with a single side open, including a front frame 100, a rear frame 200, a single side frame 300 and a bottom frame 400. The front frame 100 and the rear frame 200 are respectively connected to the front and rear sides of the bottom frame 400, and the front and rear sides of the single side frame 300 are respectively connected to the left side of the front frame 100 and the left side of the rear frame 200. The front frame 100 is connected to a push-pull rod 500, and the lower end of the push-pull rod 500 is hinged to the bottom end of the front frame 100; the bottom frame 400 and the single side frame 300 are both mutually linked foldable structures that are folded in the front and rear directions, wherein the bottom frame 400 is folded in the front and rear directions, and the single side frame 300 is also folded in the front and rear directions. The bottom ends of the front frame 100 and the rear frame 200 are both connected to rollers 600. In this embodiment, there are four rollers 600 distributed at the four corners. The bottom frame 400 is provided with a limiting mechanism for keeping the folding cart frame in the unfolded state when unfolded.

[0027] As shown in Figure 1, the bottom frame 400 includes a first frame 1 and a second frame 2. One end of the first frame 1 is hinged to the bottom end of the front frame 100, the other end of the first frame 1 is hinged to one end of the second frame 2, and the other end of the second frame 2 is hinged to the bottom end of the rear frame 200. The axis direction during rotation is along the left and right direction. The limiting mechanism includes a baffle arranged on the other end of the first frame 1. When the folding cart frame is in the unfolded state, the baffle is against one end of the second frame 2 and prevents one end of the second frame 2 and the other end of the first frame 1 from rotating downward. When folding is required, the other end of the first frame 1 and one end of the second frame 2 are rotated upward.

[0028] As shown in Figure 1, the single-side frame 300 includes a plurality of first scissor-type hinges 3, and the plurality of first scissor-type hinges 3 are hinged to each other in sequence. In this embodiment, there are three groups of first scissor-type hinges 3. The middle first scissor-type hinge 3 is hinged to a group of first scissor-type hinges 3 in front and back, respectively. The upper end of the first scissor-type hinge 3 located at the frontmost side is hinged to the front frame 100, and the lower end of the first scissor-type hinge 3 located at the frontmost side is hinged to the first slider 4 slidably connected to the front frame 100. The first scissor-type hinge 3 located at the rearmost side is hinged to the first slider 4 slidably connected to the front frame 100. The upper end of the first scissor-type hinge 3 is hinged to the rear frame 200, and the lower end of the first scissor-type hinge 3 located on the rear side is hinged to the second slider 5 slidably connected to the rear frame 200; in addition, the upper end of the first scissor-type hinge 3 located on the front side is bent to the right and extends to form a first bending section 31, and the right end of the first bending section 31 is hinged to the upper right side of the front frame 100; the upper end of the first scissor-type hinge 3 located on the rear side is bent to the right and extends to form another first bending section 31, and the right end of the first bending section 31 is hinged to the upper right end of the rear frame 200.

[0029] The present invention provides a foldable cart with only a single side frame, so that it can not only be used to place items but also to accommodate people. People can sit on the open side of the foldable cart and lean their backs against the single side frame 300, thereby improving the comfort and safety of the people when sitting. In addition, the present invention also includes a desktop panel 700 placed on the front frame 100 and the rear frame 200. When the foldable cart is in the unfolded state, the desktop panel 700 is placed on the front frame 100 and the rear frame 200. Even after the desktop panel 700 is placed on the front frame 100 and the rear frame 200, items can still be taken from the open side of the foldable cart, making it convenient to use. As shown in Figure 3, when the foldable cart needs to be folded, the desktop panel 700 is removed, the bottom frame 400 is folded upward, the connection between the first frame 1 and the second frame 2 is arched upward, the front frame 100 and the rear frame 200 are brought closer together, and the single side frame 300 is folded simultaneously.

[0030] Example 2:

[0031] As shown in Figures 4 to 5, this embodiment provides another folding cart frame with one side open. The difference between this embodiment and Example 1 is that the bottom frame 400 includes a connecting block 6 and four first connecting rods 7. The projection of the connecting block 6 on the horizontal plane falls at the center of the bottom frame 400. One end of the four first connecting rods 7 is hinged to the connecting block 6. The other ends of the four first connecting rods 7 are obliquely arranged and hinged to the left and right sides of the bottom end of the front frame 100 and the left and right sides of the bottom end of the rear frame 200 respectively. The front frame 100 and the rear frame 200 are both foldable structures foldable in the left and right directions. The limiting mechanism includes a baffle connected to the upper end surface of the connecting block 6. When the folding cart frame is in the unfolded state, the upper end surface of one end of each first connecting rod 7 is against the baffle, so that one end of each first connecting rod 7 cannot be rotated downward. When folding is required, one end of each first connecting rod 7 is rotated upward.

[0032] As shown in Figure 4, the front frame 100 includes two first columns 8 and a plurality of second scissor-type hinges 9, and the plurality of second scissor-type hinges 9 are hinged to each other left and right in sequence. In this embodiment, two groups of second scissor-type hinges 9 are provided; the upper end of the second scissor-type hinge 9 located on the far left is hinged to the first column 8 located on the left, the lower end of the second scissor-type hinge 9 located on the far left is hinged to the first slider 4 slidably connected to the first column 8 located on the left, the upper end of the second scissor-type hinge 9 located on the far right is hinged to the first column 8 located on the right, and the lower end of the second scissor-type hinge 9 located on the far right is hinged to the third slider 10 slidably connected to the first column 8 located on the right. The rear frame 200 includes two second columns 11 and a plurality of third scissor-type hinges The knife-type hinge 12 and several third scissor-type hinges 12 are hinged left and right in sequence. In this embodiment, two groups of third scissor-type hinges 12 are provided; the upper end of the third scissor-type hinge 12 located on the far left is hinged to the second column 11 on the left, and the lower end of the third scissor-type hinge 12 located on the far left is hinged to the second slider 5 slidably connected to the second column 11 on the left, the upper end of the third scissor-type hinge 12 located on the far right is hinged to the second column 11 on the right, and the lower end of the third scissor-type hinge 12 located on the far right is hinged to the fourth slider 13 slidably connected to the second column 11 on the right; the four first connecting rods 7 are respectively hinged to the lower ends of the two first columns 8 and the lower ends of the two second columns 11.

[0033] As shown in FIG5 , when folding, the connecting block 6 is lifted upward, and the four first connecting rods 7 rotate, thereby driving the front frame 100 , the rear frame 200 and the single side frame 300 to fold.

[0034] Example 3:

[0035] As shown in Figures 6 and 7, another folding stroller frame with a single-side opening is provided in this embodiment. The difference between this embodiment and the first embodiment is that the single-side frame 300 includes two second connecting rods 14 and two third connecting rods 15. The two second connecting rods 14 are cross-arranged and hinged to each other, and the hinge points of the two second connecting rods 14 are located in the upper part of the second connecting rods 14. One end of one of the third connecting rods 15 is connected to the upper end of the second connecting rod 14 of the front frame 100. One end of the third link 15 is hinged to the upper end of the second link 14, the upper end of which is close to the rear frame 200, and the other end is hinged to the rear frame 200 and bends to the right to extend to form another second bending section 151, and the right end of the second bending section 151 is hinged to the upper end of the right side of the front frame 100.

[0036] As shown in FIG7 , when folding, the bottom frame 400 folds upward, the connection between the first frame 1 and the second frame 2 arches upward, the front frame 100 and the rear frame 200 move closer to each other, and the single side frame 300 folds at the same time.

[0037] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above three embodiments. All other embodiments obtained by those skilled in the art without making any creative work shall fall within the scope of protection of the present invention.

Claims

1. A folding cart frame with one side open, characterized in that: The foldable stroller comprises a front frame (100), a rear frame (200), a single side frame (300) and a bottom frame (400); the front frame (100) and the rear frame (200) are respectively connected to the front and rear sides of the bottom frame (400); the front and rear sides of the single side frame (300) are respectively connected to the left side of the front frame (100) and the left side of the rear frame (200); the bottom frame (400) and the single side frame (300) are both mutually linked foldable structures; the bottom frame (400) is provided with a limiting mechanism for keeping the foldable stroller frame in an unfolded state when unfolded.

2. A folding cart frame with one side open according to claim 1, characterized in that: The bottom frame (400) comprises a first frame (1) and a second frame (2), one end of the first frame (1) is hinged to the bottom end of the front frame (100), the other end of the first frame (1) is hinged to one end of the second frame (2), and the other end of the second frame (2) is hinged to the bottom end of the rear frame (200), the limiting mechanism comprises a stop bar arranged on the other end of the first frame (1), when the folding stroller frame is in an unfolded state, the stop bar abuts against one end of the second frame (2) and prevents one end of the second frame (2) and the other end of the first frame (1) from rotating downward, and when folding is required, the other end of the first frame (1) and one end of the second frame (2) rotate upward.

3. A folding cart frame with one side open according to claim 1 or 2, characterized in that: The single-side frame (300) includes a plurality of first scissor-type hinges (3), and the plurality of first scissor-type hinges (3) are hinged to each other front and back in sequence. The upper end of the first scissor-type hinge (3) located at the frontmost side is hinged to the front frame (100), the lower end of the first scissor-type hinge (3) located at the frontmost side is hinged to a first slider (4) slidably connected to the front frame (100), the upper end of the first scissor-type hinge (3) located at the rearmost side is hinged to the rear frame (200), and the lower end of the first scissor-type hinge (3) located at the rearmost side is hinged to a second slider (5) slidably connected to the rear frame (200).

4. A folding cart frame with one side open according to claim 3, characterized in that: The upper ends of the first scissor-type hinges (3) located at the frontmost side and the rearmost side are each provided with a first bending section (31), and the first bending section (31) is hinged to the upper right sides of the front frame (100) and the rear frame (200), respectively.

5. The one-side open folding stroller frame according to claim 1, characterized in that: The bottom frame (400) comprises a connecting block (6) and four first connecting rods (7), the projection of the connecting block (6) on a horizontal plane falls at the center of the bottom frame (400), one end of the four first connecting rods (7) are hinged to the connecting block (6), the other ends of the four first connecting rods (7) are obliquely arranged and respectively hinged to the left and right sides of the bottom end of the front frame (100) and the left and right sides of the bottom end of the rear frame (200), the front frame (100) and the rear frame (200) are both foldable structures foldable in the left and right directions, the limiting mechanism comprises a baffle plate connected to the upper end surface of the connecting block (6), when the folding cart frame is in an unfolded state, the upper end surface of one end of each first connecting rod (7) is against the baffle plate, so that one end of each first connecting rod (7) cannot be rotated downward, and when folding is required, one end of each first connecting rod (7) is rotated upward.

6. A folding cart frame with one side open according to claim 5, characterized in that: The front frame (100) comprises two first upright posts (8) and a plurality of second scissor-type hinges (9), wherein the plurality of second scissor-type hinges (9) are hinged to each other left and right in sequence, wherein the upper end of the second scissor-type hinge (9) located on the leftmost side is hinged to the first upright post (8) located on the left, the lower end of the second scissor-type hinge (9) located on the leftmost side is hinged to a first slider (4) slidably connected to the first upright post (8) located on the left, the upper end of the second scissor-type hinge (9) located on the rightmost side is hinged to the first upright post (8) located on the right, and the second scissor-type hinge (9) located on the rightmost side is hinged to the first upright post (8) located on the right. The lower end is hinged to a third slider (10) slidably connected to the first column (8) on the right side, and the rear frame (200) includes two second columns (11) and a plurality of third scissor-type hinges (12). The plurality of third scissor-type hinges (12) are hinged to each other left and right in sequence. The upper end of the third scissor-type hinge (12) on the left side is hinged to the second column (11) on the left side, the lower end of the third scissor-type hinge (12) on the left side is hinged to the second slider (5) slidably connected to the second column (11) on the left side, the upper end of the third scissor-type hinge (12) on the right side is hinged to the second column (11) on the right side, and the lower end of the third scissor-type hinge (12) on the right side is hinged to the fourth slider (13) slidably connected to the second column (11) on the right side.

7. A folding cart frame with one side open according to claim 1 or 2, characterized in that: The single-side frame (300) comprises two second connecting rods (14) and two third connecting rods (15), wherein the two second connecting rods (14) are cross-arranged and hinged to each other, wherein one end of the third connecting rod (15) is hinged to the upper end of the second connecting rod (14) of the two second connecting rods (14) close to the upper end of the front frame (100), and the other end is hinged to the front frame (100); and the other end of the third connecting rod (15) is hinged to the upper end of the second connecting rod (14) of the two second connecting rods (14) close to the upper end of the rear frame (200), and the other end is hinged to the rear frame (200).

8. A folding stroller frame with one side open according to claim 7, characterized in that: The other ends of the two third connecting rods (15) are bent rightward to extend into a second bent section (151), and the second bent section (151) is hinged to the upper right ends of the front frame (100) and the rear frame (200), respectively.

9. The one-side open folding stroller frame according to claim 1, characterized in that: It also includes a desktop panel (700) placed on the front frame (100) and the rear frame (200).

10. The one-side open folding stroller frame according to claim 1, characterized in that: The front frame (100) is connected to a push-pull rod (500), the push-pull rod (500) is hinged to the front frame (100), and the bottom ends of the front frame (100) and the rear frame (200) are both connected to rollers (600).

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