Quick dismounting structure of front and rear leg tubes of a walking dining car

Abstract

This utility model discloses a quick-release and detachable structure for the front and rear leg tubes of a walking-assist food cart, including a quick-release and detachable mechanism for the front and rear leg tubes. The quick-release and detachable mechanism for the front leg tubes includes a front upper leg tube, a front lower leg tube, a front inner leg tube, double-pressing springs, spring holes, and a screw. The quick-release and detachable mechanism for the rear leg tubes includes a rear upper leg tube, a rear lower leg tube, a rear inner leg tube, a single-hook spring, and a spring positioning hole. This structural solution enables quick detachment and detachment of the front and rear leg tubes of the walking-assist food cart. The quick detachment allows the front and rear leg tubes to be folded a second time after one fold, further reducing the folded volume and saving transportation and packaging costs. In this patent, the gap after the inner front leg tube and inner upper leg tube are inserted can be eliminated by the engagement of the opening groove and the screw, and the gap after the rear inner leg tube and rear upper leg tube are inserted can be eliminated by the setting of the elastic plug, so as to avoid affecting normal use.

Description

Technical Field

[0001] This utility model relates to the field of medical walking aid food cart structure technology, and in particular to a quick-assembly and disassembly structure for the front and rear leg tubes of a walking aid food cart. Background Technology

[0002] The applicant's previous application, CN219354581U, describes a walking food cart with a one-click folding function. While this function allows for one-click folding, the structure still cannot minimize the folded volume of the cart. This would increase costs for production and sales companies that require goods transportation and warehousing. Furthermore, it would hinder users from easily loading the cart for moving or camping applications. To address this issue, the applicant has further optimized the structure so that after one-click folding, the front and rear wheel tubes can be quickly disassembled and folded again to reduce the packaging and transportation volume. It can also be quickly installed without affecting normal use. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art, the purpose of this utility model is to provide a quick-release and detachable structure for the front and rear leg tubes of a walking food cart, so as to solve the technical problems mentioned in the background art.

[0004] To solve the technical problem, this utility model adopts the following technical solution: A quick-release and detachable structure for the front and rear leg tubes of a walking-assist food cart includes: The quick-release mechanism for the front leg tube includes an upper front leg tube, a lower front leg tube, an inner front leg tube, a double-press ball, a ball hole, and a screw. One end of the inner front leg tube is inserted into the lower front leg tube, and the other end is provided with a double-press ball and an opening groove in sequence. The upper front leg tube is provided with a double-press ball hole and a screw in sequence. When the inner front leg tube is inserted into the upper front leg tube, the double-press ball is elastically locked with the double-press ball hole, and the opening groove is engaged with the screw. The quick-release mechanism for the rear leg tube includes an upper rear leg tube, a lower rear leg tube, an inner rear leg tube, a single-hook ball, and a ball positioning hole. The lower end of the inner rear leg tube is inserted downward into the lower rear leg tube, and the upper end is sequentially provided with a single-hook ball and an elastic plug. The upper rear leg tube is provided with a ball positioning hole. When the inner rear leg tube is inserted into the upper rear leg tube, the ball end of the single-hook ball is elastically locked with the ball positioning hole, and the elastic plug is inserted inward into the cavity of the upper rear leg tube to eliminate gaps.

[0005] Specifically, the double-press marble includes a spring plate part and a marble part. The marble part is located on both outer sides of the U-shaped spring plate part, and a marble extension hole for the marble part to extend is provided on one side of the front inner leg tube.

[0006] It also includes a front horizontal leg tube, which is located between two front upper leg tubes. The front upper leg tube is provided with a screw through hole, and the front horizontal leg tube is provided with a screw inner hole at the position corresponding to the screw through hole. The screw passes through the screw through hole from the outside of the front upper leg tube to the screw inner hole and is screwed into the screw inner hole.

[0007] Specifically, the single-hook marble includes a wire end and a marble end. The marble end is located outside the V-shaped or U-shaped wire end, and the wire end is fitted into the cavity of the rear inner leg tube. Specifically, the elastic plug includes an insertion end and an elastic expansion end, wherein the elastic end is inserted into the hole of the rear inner leg tube, and the elastic expansion end expands and tightens after being inserted into the cavity of the rear upper leg tube to eliminate gaps.

[0008] It also includes a rear horizontal leg tube, which is located between two rear upper leg tubes. The rear horizontal leg tube has a fixing seat on both sides. The fixing seat has an inwardly concave arc surface that fits tightly against the outside of the rear upper leg tube. The fixing seat has a fixing outer hole, and the rear upper leg tube has a fixing inner hole. The bolt passes through the fixing outer hole and the fixing inner hole and is fixed by a nut.

[0009] Compared with the prior art, the beneficial effects of this utility model are as follows: (1) The structure of this vehicle can be quickly assembled and disassembled. The quick assembly and disassembly allows the front and rear legs of the vehicle to be folded twice after one fold, further reducing the folded volume and saving transportation and packaging costs. (2) In this patent, the gap between the inner front leg tube and the inner upper leg tube after insertion can be eliminated by engaging the opening groove with the screw, and the gap between the rear inner leg tube and the rear upper leg tube after insertion can be eliminated by setting the elastic plug, so as to avoid affecting normal use. Attached Figure Description

[0010] Figure 1 This is one of the schematic diagrams showing the overall structural installation effect of this patent. Figure 2 This is the second schematic diagram showing the overall structural installation effect of this patent. Figure 3 This is a schematic diagram showing the disassembly of the front lower tube and the front upper tube, and the disassembly of the rear lower tube and the rear upper tube in this patent. Figure 4 : This is an exploded view of the quick-release mechanism for the front and rear legs of the tube in this patent. Figure 5 : Rear view, which is a schematic diagram of the overall structure of this patent and its installation effect; Figure 6 :for Figure 5 AA section diagram; Figure 7 :for Figure 6 Enlarged view of section A in the middle; Figure 8 This is an exploded view of the rear horizontal leg tube structure in this patent. In the diagram: 1A for quick assembly / disassembly of front leg tubes, 1 for upper front leg tube, 2 for lower front leg tube, 3 for inner front leg tube, 4 for double-press ball bearing, 11 for ball bearing hole, 31 for opening groove, 12 for screw; 2A for quick assembly / disassembly of rear leg tubes, 5 for upper rear leg tube, 6 for lower rear leg tube, 7 for inner rear leg tube, 8 for single-hook ball bearing, 51 for ball bearing positioning hole, 71 for elastic plug, 41 for spring plate part, 42 for ball bearing part, 43 for ball bearing extension hole, 9 for front horizontal leg tube, 13 for screw through hole, 91 for screw inner hole, 81 for spring wire end, 82 for ball bearing end, 711 for plug end, 712 for elastic expansion end, 10 for rear horizontal leg tube, 101 for fixing seat, 101 for concave arc surface, 101b for fixing outer hole, 101c for fixing inner hole, 201 for front wheel, 202 for rear wheel, 1B for front leg tube, 2B for rear leg tube, 3B for armrest. Detailed Implementation

[0011] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0012] refer to Figures 1 to 8 : This embodiment discloses a quick-release and detachable structure for the front leg tube 1B and rear leg tube 2B of a walking-assistance food cart, including a quick-release and detachable mechanism 1A for the front leg tube 1B and a quick-release and detachable mechanism 2A for the rear leg tube 2B. The quick-release and detachable mechanism 1A for the front leg tube 1B includes an upper front leg tube 1, a lower front leg tube 2, an inner front leg tube 3, a double-pressing ball bearing 4, a ball bearing hole 11, and a screw 12. Figures 1 to 3As shown, the upper end of the front upper leg tube 1 is connected to the armrest 3B, and the lower end of the front lower leg tube 2 is fitted with the front wheel 201. The front upper leg tube 1 and the front lower leg tube are spliced ​​together to form the front leg tube 1B. One end of the front inner leg tube 3 is inserted into and fixed to the front lower leg tube 2 (fixed by rivets), and the other end is provided with a double-press ball 4 and an opening groove 31. The double-press ball 4 is located in the cavity of the front inner leg tube 3, and its output end (ball part 42) extends out of the ball protrusion hole 43. The opening groove 31 is located at the end of the front inner leg tube 3 facing the front upper leg tube 1, and the opening is U-shaped. When the front inner leg tube 3 is inserted into the front upper leg tube 1, the opening groove 31 extends into the tube of the front upper leg tube 1 and engages with the screw 12. The lower end of the front upper leg tube 1 is provided with a double-press ball 4 hole and the upper end is provided with a screw 12. When the front inner leg tube 3 is inserted into the front upper leg tube 1, the double-press ball 4 is elastically locked with the double-press ball 4 hole, and the opening groove 31 is locked with the screw 12. When the opening groove 31 is locked with the screw 12, because the groove diameter of the opening groove 31 is equivalent to the diameter of the screw 12, the front inner leg tube 3 and the screw 12 are locked together to prevent the gap between the front inner leg tube 3 and the front upper leg tube 1. The gap will affect the stability of the subsequent trolley movement and cause shaking. Thus, the quick disassembly and assembly of the front upper leg tube 1 and the front lower leg tube 2 in the front leg tube 1B are completed by the quick disassembly and assembly mechanism 1A of the front leg tube 1B. Specifically, the quick-release mechanism 2A for the rear leg tube 2B includes an upper rear leg tube 5, a lower rear leg tube 6, an inner rear leg tube 7, a single-hook ball bearing 8, and a ball bearing positioning hole 51, as shown below. Figures 1 to 3 As shown, the rear upper leg tube 5 and the rear lower leg tube 6 are spliced ​​together to form the rear leg tube 2B. The rear upper leg tube 5 is rotatably connected to one end of the front upper leg tube 1. The rear wheel 202 is installed at the lower end of the rear lower leg tube 6. As shown in publication number CN219354581U, after the front leg tube 1B and the rear leg tube 2B are folded with one click, the length of the front leg tube 1B and the rear leg tube 2B is still very long, resulting in a huge volume of the entire product after folding. Here, two quick disassembly and assembly mechanisms are used to help this mobile dining cart complete a second fold. Specifically, the lower end of the rear inner leg tube 7 is inserted downward and fixed into the tube of the rear lower leg tube 6, and the upper end is provided with single hook springs in sequence. The single-hook ball 8 and the elastic plug 71 are located in the cavity of the rear inner leg tube 7 and at the lower end of the elastic plug 71. The elastic plug 71 is located at the uppermost end of the rear inner leg tube 7. When the rear inner leg tube 7 is inserted into the cavity of the rear upper leg tube 5, the elastic plug 71 can tightly fit the cavity wall of the rear upper leg tube 5 through its expansion and opening characteristics, thereby eliminating the gap between the rear inner leg tube 7 and the rear upper leg tube 5. The rear upper leg tube 5 is provided with a ball positioning hole 51. When the rear inner leg tube 7 is inserted into the rear upper leg tube 5, the ball end 82 of the single-hook ball 8 is just elastically locked with the ball positioning hole 51, and the elastic plug 71 is inserted into the cavity of the front upper leg tube 1 to eliminate the gap.

[0013] Specifically, the double-pressed pin 4 includes a spring plate portion 41 and a pin portion 42. The pin portion 42 is located on both outer sides of the U-shaped spring plate portion 41. The front inner leg tube 3 has a pin extension hole 43 on one side for the pin portion 42 to extend outwards. The U-shaped spring plate portion 41 has an outwardly expanding elastic drive. When the spring plate portion 41 is placed inside the cavity of the front inner leg tube 3, the outwardly expanding elastic drive ensures that the pin portion 42 always faces the pin extension hole 43. When the front inner leg tube 3 is inserted into the front upper leg tube 1, the pin portions 42 on both sides can be slightly... Press it to retract slightly into the ball protrusion hole 43. When the ball part 42 enters the cavity of the front upper leg tube 1, and when the ball part 42 reaches the position of the double-press ball 4 hole, with the force of the ball part 42 always being pushed outward, the ball part 42 can automatically spring outward into the double-press ball 4 hole, thereby completing the locking and engagement of the front inner leg tube 3 and the front upper leg tube 1. When it is necessary to disassemble and fold, simply use both hands or a hard tool to press the ball part 42 of the double-press ball 4 inward, and then hold the front lower leg tube 2 and pull it down to easily disassemble the front lower leg tube 2.

[0014] Specifically, it also includes a front horizontal leg tube 9, which is located between two front upper leg tubes 1. The front upper leg tube 1 is provided with a screw through hole 13, and the front horizontal leg tube 9 is provided with a screw inner hole 91 corresponding to the screw through hole 13. The screw 12 passes through the screw through hole 13 from the outside of the front upper leg tube 1 to the screw inner hole 91 and is screwed into the screw inner hole 91. Thus, the screw 12 has a dual function: on the one hand, it is used to fix the front horizontal leg tube 9 and the front upper leg tube 1; on the other hand, the part located in the cavity of the front upper leg tube 1 can be used as a positioning rod to be inserted into the opening slot 31 to help eliminate gaps when the front inner leg tube 3 and the front upper leg tube 1 are inserted.

[0015] Specifically, the single-hook marble 8 includes a spring end 81 and a marble end 82. The marble end 82 is located outside the V-shaped or U-shaped spring end 81. The spring end 81 is fitted into the cavity of the rear inner leg tube 7. When the rear inner leg tube 7 is inserted into the rear upper leg tube 5, the marble end 82 of the single-hook marble 8 can automatically align with the marble positioning hole 51 of the rear upper leg tube 5 during the upward insertion of the rear inner leg tube 7 to complete the insertion and locking of the inner leg tube 7 and the rear upper leg tube 5. When disassembly is required, simply press the marble end 82 of the single-hook marble 8 in the opposite direction, and then pull out the rear lower leg tube 6 to complete the disassembly of the lower leg tube 6. After the lower leg tube 6 is disassembled, the rear inner leg tube 7 is pulled out together.

[0016] Specifically, the elastic plug 71 includes an insertion end 711 and an elastic expansion end 712, wherein the elastic end is inserted into the tube hole of the rear inner leg tube 7, and the elastic expansion end 712 expands and tightens after being inserted into the tube cavity of the rear upper leg tube 5, so as to eliminate the gap between the tube cavity of the rear inner leg tube 7 and the rear upper leg tube 5.

[0017] Specifically, it also includes a rear horizontal leg tube 10, which is located between two rear upper leg tubes 5. The rear horizontal leg tube 10 has a fixing seat 101 on both sides. The fixing seat 101 has an inwardly concave arc surface 101a that fits tightly against the outside of the rear upper leg tube 5. The fixing seat 101 has a fixing outer hole 101b, and the rear upper leg tube 5 has a fixing inner hole 101c. Bolts pass through the fixing outer hole 101b and the fixing inner hole 101c and are fixed by nuts. Here, because of the forward-concave tube structure of the rear horizontal leg tube 10, it will also hinder the reduction of the overall folding volume when folding. Through this technical solution, the traditional direct welding method is replaced. The rear horizontal leg tube 10 adopts a bolt connection, which is also convenient for disassembly. After disassembly, the folding volume of the product can be further reduced.

[0018] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A quick-release and detachable structure for the front and rear leg tubes of a walking-assist food cart, characterized in that, include The quick-release mechanism for the front leg tube includes an upper front leg tube, a lower front leg tube, an inner front leg tube, a double-press ball, a ball hole, and a screw. One end of the inner front leg tube is inserted into the lower front leg tube, and the other end is provided with a double-press ball and an opening groove in sequence. The upper front leg tube is provided with a double-press ball hole and a screw in sequence. When the inner front leg tube is inserted into the upper front leg tube, the double-press ball is elastically locked with the double-press ball hole, and the opening groove is engaged with the screw. The quick-release mechanism for the rear leg tube includes an upper rear leg tube, a lower rear leg tube, an inner rear leg tube, a single-hook ball, and a ball positioning hole. The lower end of the inner rear leg tube is inserted downward into the lower rear leg tube, and the upper end is sequentially provided with a single-hook ball and an elastic plug. The upper rear leg tube is provided with a ball positioning hole. When the inner rear leg tube is inserted into the upper rear leg tube, the ball end of the single-hook ball is elastically locked with the ball positioning hole, and the elastic plug is inserted inward into the cavity of the upper rear leg tube to eliminate gaps.

2. The quick-release structure for the front and rear leg tubes of a walking cart as described in claim 1, characterized in that, The double-press marble includes a spring plate part and a marble part. The marble part is located on both outer sides of the U-shaped spring plate part. A marble extension hole for the marble part to extend is provided on one side of the front inner leg tube.

3. The quick-release and detachable structure for the front and rear leg tubes of a walking-assistance food cart as described in claim 1, characterized in that, It also includes a front horizontal leg tube, which is located between two front upper leg tubes. The front upper leg tube is provided with a screw through hole, and the front horizontal leg tube is provided with a screw inner hole at the position corresponding to the screw through hole. The screw passes through the screw through hole from the outside of the front upper leg tube to the screw inner hole and is screwed into the screw inner hole.

4. The quick-release and detachable structure for the front and rear leg tubes of a walking cart as described in claim 1, characterized in that, The single-hook marble includes a wire end and a marble end. The marble end is located outside the wire end, which is V-shaped or U-shaped, and the wire end is fitted into the cavity of the rear inner foot tube.

5. The quick-release structure for the front and rear leg tubes of a walking-assistance food cart as described in claim 1, characterized in that, The elastic plug includes an insertion end and an elastic expansion end. The elastic end is inserted into the hole of the rear inner leg tube, and the elastic expansion end expands and tightens after being inserted into the cavity of the rear upper leg tube to eliminate gaps.

6. The quick-release structure for the front and rear leg tubes of a walking cart as described in claim 1, characterized in that, It also includes a rear horizontal leg tube, which is located between two rear upper leg tubes. The rear horizontal leg tube has a fixing seat on both sides. The fixing seat has an inwardly concave arc surface that fits tightly against the outside of the rear upper leg tube. The fixing seat has a fixing outer hole, and the rear upper leg tube has a fixing inner hole. The bolt passes through the fixing outer hole and the fixing inner hole and is fixed by a nut.

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