Foldable trundle

Abstract

The utility model discloses a foldable trundle which comprises an installation piece, and a supporting arm is welded to the front end of the installation piece. A support is attached to the interior of the supporting arm, wheels are rotatably connected to the bottom of the support, a round pin is fixed to the top of the support, a special-shaped pin is slidably connected to the left end of the round pin, the left end of the special-shaped pin penetrates through the interior of a through hole to form a clamping mechanism, and the through hole is formed in the left end of the supporting arm. A first spring is connected to the middle of the round pin in a nested mode, the left end of the first spring is connected with the right end of the special-shaped pin, the right end of the first spring is connected with the inner wall of the support, and a rivet penetrates through the supporting arm and the upper middle side of the support in a sliding mode. The foldable trundle is provided with the special-shaped pins, and the special-shaped pins are clamped with the through holes, so that after the support is folded, the wheel can be stably clamped on the supporting arms, and the wheel has high stability after being folded.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of trundle, concretely is a foldable trundle. BACKGROUND

[0002] Trundle is usually applied in the equipment such as wheelchair, trolley, folding luggage cart, storage cage, etc. The main feature of trundle is to save space, improve the portability and flexibility of equipment, and the movement of equipment can be facilitated through trundle.

[0003] The existing trundle can only be locked through the rubber block, and the tire of the locked trundle still contacts the ground. Since the contact area of the tire with the ground is small, the equipment may be deviated after being locked on the slope, and then the stability is not enough.

[0004] To solve the above-mentioned defects, a folding trundle device with adjustable height is disclosed in publication No. CN207449525U. The device is folded and landed through the second rotating shaft. When folding, the first tongue piece is locked through the slot on the positioning block. When landing, the second tongue piece is locked through the gap on the positioning block. Then, the device realizes quick folding and landing, and is convenient to unlock without the need for tool assistance. The folding wheel height is adjustable, which reduces the processing difficulty, improves the applicability of the folding wheel, and can temporarily adjust the folding wheel height when encountering a non-horizontal ground.

[0005] In the actual use of the above-mentioned device, although it can be folded conveniently, the universal wheel will be fitted into the arc-shaped wheel groove after folding. However, the universal wheel does not have a clamping mechanism, which will cause the universal wheel to shake after folding, and thus the universal wheel is not stable enough.

[0006] Therefore, we propose a foldable trundle that can solve the above problems. UTILITY MODEL CONTENTS

[0007] The utility model aims to provide a foldable trundle to solve the problem that the universal wheel will be fitted into the arc-shaped wheel groove after folding on the market, but the universal wheel does not have a clamping mechanism, which will cause the universal wheel to shake after folding, and thus the universal wheel is not stable enough.

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a foldable trundle, comprising a mounting piece, a support arm is welded at the front end of the mounting piece;

[0009] Further comprising:

[0010] The inside of the support arm is attached with a support, the bottom of the support is rotationally connected with a wheel, the top of the support is fixedly connected with a round pin, the left end of the round pin is slidably connected with a female pin, the left end of the female pin penetrates through the inside of a through hole to form a clamping mechanism, the through hole is arranged on the left end of the support arm, the middle part of the round pin is nested with a first spring, the left end of the first spring is connected with the right end of the female pin, and the right end of the first spring is connected with the inner wall of the support, and the middle upper side of the support arm and the support is slidably penetrated with a rivet.

[0011] Preferably, the middle part of the female pin is nested with a circlip, and the left end of the circlip is attached to the inner wall of the support.

[0012] Preferably, the left end of the rivet is slidably connected with a clamping block, and the right end of the clamping block is attached to the left side of the support arm.

[0013] Preferably, the right end of the clamping block is slidably connected with a protruding block, and the right side of the outer end of the protruding block is arc-shaped.

[0014] Preferably, the outer end of the protruding block extends into the inside of a groove to form a clamping mechanism, and the groove is arranged in the inside of the rivet.

[0015] Preferably, the inner end of the protruding block is connected with a second spring, and the inner end of the second spring is connected in the inside of the clamping block.

[0016] Preferably, the inner end of the protruding block is connected with a pull rope, the left end of the pull rope extends out of the inside of the clamping block through a pulley to form a sliding mechanism, and the pulley is connected in the inside of the clamping block through a bearing.

[0017] Compared with the prior art, the folding trolley has the advantages of good stability and convenient disassembly, the wheel has good stability after being folded through the movement of the female pin, and the support can be conveniently disassembled through the clamping of the protruding block, and the specific contents are as follows:

[0018] (1) The female pin is arranged, the female pin and the through hole are clamped, the support is folded, the wheel can be stably clamped on the support arm, and the wheel has high stability after being folded;

[0019] (2) The protruding block is arranged, the support can be individually disassembled through the movement of the protruding block, the wheel can be disassembled when not needed, and the purpose of convenient disassembly is achieved;

[0020] (3) The circlip is arranged, the middle part of the female pin is nested with the circlip, the left end of the circlip is attached to the inner wall of the support, the circlip can limit the female pin, and the female pin is prevented from separating from the inside of the through hole.

[0021] (4) provided with a protruding block, by the outer end of the protruding block into the inside of the groove constitutes a clamping mechanism, and the groove is opened in the inside of the rivet, and then by the movement of the protruding block can be separated from the clamping of the groove, so as to facilitate the disassembly of the clamping block;

[0022] (5) provided with a pulley, the inner end of the protruding block is connected with a pull rope, and the left end of the pull rope is extended into the inside of the clamping block through the pulley to constitute a sliding mechanism, and the pulley is connected in the inside of the clamping block through the bearing, and then the pulley can reduce the friction of the pull rope movement, thereby prolonging the service life of the pull rope. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a schematic diagram of the present utility model;

[0024] Figure 2 It is a schematic diagram of the present utility model;

[0025] Figure 3 It is a schematic diagram of the present utility model;

[0026] Figure 4 It is a schematic diagram of the present utility model Figure 1 It is a schematic diagram of the present utility model;

[0027] Figure 5 It is a schematic diagram of the present utility model;

[0028] Figure 6 It is a schematic diagram of the present utility model.

[0029] In the figure: 1, mounting piece; 2, support arm; 3, support; 4, wheel; 5, round pin; 6, different sex pin; 7, through hole; 8, first spring; 9, clamping spring; 10, rivet; 11, clamping block; 12, protruding block; 13, groove; 14, second spring; 15, pull rope; 16, pulley. DETAILED DESCRIPTION

[0030] The technical scheme in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, not all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present utility model.

[0031] Embodiment one: the present utility model solves the problem that the existing folding universal wheel will be in the arc-shaped wheel groove, but the universal wheel does not have a clamping mechanism, which will cause the universal wheel to shake after folding, thereby the universal wheel is not stable enough. The movement of the different sex pin 6 can improve the stability after folding, and the present utility model is disclosed:

[0032] The mounting sheet 1, the front end of the mounting sheet 1 is welded with the support arm 2, further comprising: the inside of the support arm 2 is matched with the support 3, and the bottom of the support 3 is rotatably connected with the wheel 4, the top of the support 3 is fixed with the round pin 5, and the left end of the round pin 5 is slidably connected with the female pin 6, and the left end of the female pin 6 penetrates through the inside of the through hole 7 to form a clamping mechanism, the through hole 7 is arranged at the left end of the support arm 2, and the middle part of the round pin 5 is nested with the first spring 8, and the left end of the first spring 8 is connected with the right end of the female pin 6, and the right end of the first spring 8 is connected with the inner wall of the support 3, and the middle upper side of the support arm 2 and the support 3 penetrates and slides the rivet 10;

[0033] Reference Figures 1 to 3 And Figure 5 When the wheel 4 needs to be folded, the female pin 6 is pressed to slide on the round pin 5, so that the female pin 6 moves to press the first spring 8, so that the first spring 8 is compressed under stress, and the female pin 6 moves to be separated from the clamping of the large hole of the through hole 7, then the wheel 4 is rotated, so that the wheel 4 can be rotated around the rivet 10 as the center through the support 3, after the wheel 4 is folded, the force of the first spring 8 can top the female pin 6 into the inside of the through hole 7, so that the female pin 6 is clamped with the through hole 7, so that the wheel 4 can have high stability after being folded, and when the wheel 4 needs to be restored, the above operation is reversed, so that the folding is convenient;

[0034] Embodiment two: the embodiment one solves the problem that the female pin 6 and the through hole 7 are not stable enough, the stability of the female pin 6 can be improved by the snap spring 9, and the female pin 6 is convenient to disassemble, and the utility model discloses:

[0035] The middle part of the female pin 6 is nested with the snap spring 9, and the left end of the snap spring 9 is matched on the inner wall of the support 3;

[0036] Reference Figure 1 When disassembling is needed, the snap spring 9 is taken off from the female pin 6, so that the female pin 6 can be separated from the inside of the round pin 5, and the female pin 6 can be separated from the through hole 7 by sliding, then the rivet 10 is pulled, so that the rivet 10 can be separated from the support arm 2, so that the support 3 can be separated from the support arm 2, and then the support 3 is convenient to disassemble;

[0037] Embodiment three: the utility model solves the problem that the existing rivet 10 will produce metal fatigue due to bending after long-time disassembly, so that the stability is decreased, the movement of the convex block 12 can avoid the metal fatigue of the rivet 10, and the utility model discloses:

[0038] The left end of the rivet 10 is slidingly connected with the clamping block 11, the right end of the clamping block 11 is attached to the left side of the supporting arm 2, the right end of the clamping block 11 is slidingly connected with the protruding block 12, the right side of the outer end of the protruding block 12 is arc-shaped, the outer end of the protruding block 12 extends into the inside of the recess 13 to form a clamping mechanism, the recess 13 is arranged in the inside of the rivet 10, the inner end of the protruding block 12 is connected with the second spring 14, the inner end of the second spring 14 is connected in the inside of the clamping block 11, the inner end of the protruding block 12 is connected with the pull rope 15, the left end of the pull rope 15 extends out of the inside of the clamping block 11 through the pulley 16 to form a sliding mechanism, and the pulley 16 is connected in the inside of the clamping block 11 through the bearing;

[0039] Reference Figure 1 And Figure 4 By pulling the pull rope 15, the pull rope 15 moves through the pulley 16 to drive the protruding block 12 to move, so that the protruding block 12 moves and is accommodated in the inside of the clamping block 11, so that the protruding block 12 is separated from the clamping of the recess 13, and the protruding block 12 moves to compress the second spring 14, so that the second spring 14 is forced to compress, then pull the clamping block 11, so that the clamping block 11 can be separated from the rivet 10, so that the rivet 10 can be moved away from the supporting arm 2, and by reversing the above operation, the protruding block 12 is pushed into the inside of the recess 13 by the second spring 14 to form a clamping, so that the rivet 10 can be stably clamped in the inside of the supporting arm 2, so that the rivet 10 can be disassembled and used many times, so as to avoid replacing the rivet 10 due to metal fatigue caused by bending.

[0040] Working principle: when using the foldable caster, first of all, Figures 1 to 3 And Figure 5 When the wheel 4 needs to be folded, the non-circular pin 6 is pressed to make the non-circular pin 6 slide on the round pin 5, and the non-circular pin 6 moves to separate from the clamping of the large hole of the through hole 7, then the wheel 4 is rotated, so that the wheel 4 can be rotated around the rivet 10 as the center through the support 3, after the wheel 4 is folded, the force of the first spring 8 pushes the non-circular pin 6 into the inside of the through hole 7, and when the wheel 4 needs to be restored, the above operation is reversed, so as to achieve the purpose of convenient folding;

[0041] Reference Figure 1 When disassembling is needed, the clamping spring 9 is removed from the non-circular pin 6, so that the non-circular pin 6 can be separated from the inside of the round pin 5, then the rivet 10 is pulled, so that the rivet 10 can be separated from the supporting arm 2, so as to facilitate the disassembly of the support 3;

[0042] Reference Figure 1 And Figure 4, by pulling the pull rope 15, in turn, the pull rope 15 moves through the pulley 16 to drive the protrusion 12 to move, in turn, the protrusion 12 will be disengaged from the engagement of the groove 13, then pull the block 11, in turn, the block 11 can be disengaged from the rivet 10, and by reversing the above operation, in turn, the second spring 14 drives the protrusion 12 to extend into the inside of the groove 13 to form engagement, so that the rivet 10 can be stably engaged in the inside of the support arm 2, so that the rivet 10 can be used multiple times, in turn, to avoid the rivet 10 to be replaced due to bending and metal fatigue.

[0043] The contents not described in detail in the specification belong to the prior art known to those skilled in the art.

[0044] Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacement to part of the technical features, and any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model shall be included in the protection scope of the utility model.

Claims

1. A foldable caster, comprising a mounting sheet (1), a support arm (2) welded to the front end of the mounting sheet (1); characterized in that Further comprising: An inner part of the support arm (2) is fitted with a bracket (3), a wheel (4) is rotatably connected to the bottom of the bracket (3), a round pin (5) is fixed to the top of the bracket (3), a female pin (6) is slidably connected to the left end of the round pin (5), the left end of the female pin (6) penetrates through the inside of a through hole (7) to form a clamping mechanism, the through hole (7) is arranged at the left end of the support arm (2), a first spring (8) is nestedly connected to the middle part of the round pin (5), the left end of the first spring (8) is connected with the right end of the female pin (6), and the right end of the first spring (8) is connected with the inner wall of the bracket (3), a rivet (10) penetrates and slides through the middle upper side of the support arm (2) and the bracket (3).

2. The foldable caster according to claim 1, wherein: The middle part of the female pin (6) is nested with a clamping spring (9), and the left end of the clamping spring (9) is fitted on the inner wall of the bracket (3).

3. The foldable caster wheel of claim 1, wherein: The left end of the rivet (10) is slidably connected with a clamping block (11), and the right end of the clamping block (11) is fitted on the left side of the support arm (2).

4. A foldable caster according to claim 3, wherein: The right end of the clamping block (11) is slidably connected with a protruding block (12), and the right side of the outer end of the protruding block (12) is arc-shaped.

5. A foldable caster according to claim 4, wherein: The outer end of the protruding block (12) extends into the inside of a groove (13) to form a clamping mechanism, and the groove (13) is arranged in the inside of the rivet (10).

6. A foldable caster according to claim 5, wherein: The inner end of the protruding block (12) is connected with a second spring (14), and the inner end of the second spring (14) is connected in the inside of the clamping block (11).

7. A foldable caster wheel according to claim 5, wherein: The inner end of the protruding block (12) is connected with a pull rope (15), the left end of the pull rope (15) extends out of the inside of the clamping block (11) through a pulley (16) to form a sliding mechanism, and the pulley (16) is connected in the inside of the clamping block (11) through a bearing.

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