Double-pedal trundle

Abstract

The utility model discloses a double pedal caster, including mounting shell, pulley and wheel brake piece, the wheel brake piece includes first pedal, second pedal and locking unit, first pedal and second pedal both can rotatablely install on the mounting shell, the pulley is rotatablely connected with the mounting shell, locking unit is rotatablely connected with the second pedal, and locking unit is rotatablely connected with the mounting shell. The mounting shell is used for being rotatably connected with a foot column; the first pedal and the second pedal are mutually linked, and when the first pedal is treaded down, the second pedal is driven to tilt, and the locking unit is driven to unlock the pulley and the foot column at the same time; when the second pedal is treaded down, the first pedal is driven to tilt, and the locking unit is driven to lock the pulley and the foot column at the same time. Through the linkage between the first pedal and the second pedal, the switching between the wheel brake and the brake release can be realized only by treading, the operation of a user is facilitated, and the wheel brake and the brake release can be quickly realized.

Description

Technical Field

[0001] The utility model relates to the technical field of casters, in particular to a double-pedal caster. Background Art

[0002] Existing casters are usually provided with a wheel brake member. When the wheel brake is needed, the operator's foot presses down the wheel brake member; when the brake is needed, the operator's foot needs to extend under the wheel brake member to lift the wheel brake member upward.

[0003] However, due to the limited space under the wheel brake and the limited size of the wheel brake itself, the operator's feet may not be able to accurately lift the wheel brake upwards and quickly release the brake due to the differences in the size and shape of different shoes. Especially when the caster is used in the medical industry, it causes a lot of inconvenience in use.

[0004] In addition, dust and hair are easily absorbed into the existing casters during use, which shortens the service life of the casters.

[0005] Therefore, it is necessary to design a double-pedal caster that can be dustproof and can quickly realize wheel brake and brake release operation. Utility Model Content

[0006] The utility model aims to overcome the deficiencies of the prior art and provide a double-pedal caster which is dustproof and can quickly realize wheel braking and brake release operations.

[0007] The technical solution of the utility model provides a double-pedal caster, comprising a mounting housing, a pulley and a wheel brake, wherein the wheel brake comprises a first pedal, a second pedal and a locking unit, wherein the first pedal and the second pedal are both rotatably mounted on the mounting housing, the pulley is rotatably connected to the mounting housing, and the mounting housing is used to be rotatably connected to a foot column;

[0008] The first pedal and the second pedal are linked to each other. When the first pedal is stepped on, the second pedal is lifted up and the locking unit is driven to unlock the pulley and the foot column at the same time; when the second pedal is stepped on, the first pedal is lifted up and the locking unit is driven to lock the pulley and the foot column at the same time.

[0009] Further, the first pedal is located above the second pedal, a first hinge point is provided on the surface of the mounting housing, a sunken surface is provided below the first hinge point, and the first pedal is hinged to the first hinge point;

[0010] After the first pedal is stepped on, the first pedal fits with the sunken surface, and the second pedal tilts upward and docks with the first pedal;

[0011] After the second pedal is stepped on, the first pedal tilts upward and separates from the sunken surface.

[0012] Further, the locking unit includes a linkage, a foot locking assembly and a pulley locking assembly;

[0013] After the second pedal is stepped on, the second pedal drives the linkage member to push upward, and the linkage member contacts and locks with the foot column locking assembly and the pulley locking assembly;

[0014] After the first pedal is stepped on, the first pedal drives the second pedal to tilt upward, and the linkage member falls back and is separated and unlocked from the foot column locking assembly and the pulley locking assembly.

[0015] Further, the first pedal includes a first convex portion, and the second pedal includes a first concave portion and a second convex portion;

[0016] The linkage member includes a third convex portion, and the second pedal includes a second concave portion and a fourth convex portion;

[0017] After the second pedal is stepped on, the second convex portion pushes the first convex portion to disengage from the first concave portion, the first pedal tilts upward, the fourth convex portion pushes the third convex portion to disengage from the second concave portion, and the fourth convex portion pushes the linkage member upward;

[0018] After the first pedal is stepped on, the first convex portion enters into the first concave portion and pushes the second pedal to tilt upward, the third convex portion falls back into the second concave portion, and the linkage member falls back downward.

[0019] Further, the foot post locking assembly includes a mounting post, a first gear ring, a foot post bearing and a compression spring;

[0020] The first gear ring and the compression spring are both sleeved on the outside of the mounting column, the compression spring is located above the first gear ring, the foot column bearing is installed between the mounting column and the mounting shell, and the mounting column is fixedly connected to the foot column;

[0021] The linkage member is provided with a first tooth portion. When the linkage member is lifted up, the first tooth portion contacts the first gear ring, and the first tooth portion pushes the first gear ring upward, and the compression spring is compressed. When the mounting column is rotated until the first gear ring is aligned with the first tooth portion, the compression spring pushes the first gear ring downward to engage with the first tooth portion.

[0022] When the linkage member falls back, the first tooth portion is separated from the first gear ring and unlocked.

[0023] Furthermore, rectangular teeth are provided on the first gear ring and the first gear portion.

[0024] Further, the pulley locking assembly includes a locking wheel, the locking wheel is rotatably connected to the mounting housing, the outer ring of the locking wheel is fixedly connected to the pulley, the inner ring of the locking wheel is provided with a second gear ring, and the linkage member is provided with a second tooth portion;

[0025] When the linkage member is lifted up, the second tooth portion meshes with the second gear ring to lock the pulley;

[0026] When the linkage member falls back, the second tooth portion is separated from the second gear ring, unlocking the pulley.

[0027] Furthermore, triangular teeth are provided on the second gear ring and the second gear portion.

[0028] Furthermore, a notch is provided at the bottom of the installation shell, and the linkage member enters through the notch and is installed in the installation shell.

[0029] Furthermore, a limiting plate arranged in the longitudinal direction is provided at the edge of the notch, and the second tooth portion is installed between two of the limiting plates.

[0030] After adopting the above technical solution, the following beneficial effects are achieved:

[0031] The utility model realizes the switching between wheel braking and brake release only by stepping on the first pedal and the second pedal is linked, which is convenient for the user to operate and can quickly realize the wheel braking and brake release operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The disclosure of the present invention will become easier to understand with reference to the accompanying drawings. It should be understood that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the drawings:

[0033] Figure 1 It is a three-dimensional diagram of a double-pedal caster in an embodiment of the utility model when the brakes are released;

[0034] Figure 2 It is a cross-sectional view of a double-pedal caster in an embodiment of the utility model when the brakes are released;

[0035] Figure 3 It is a three-dimensional diagram of a double-pedal caster wheel brake in one embodiment of the utility model;

[0036] Figure 4 It is a cross-sectional view of a double-pedal caster wheel brake in one embodiment of the utility model;

[0037] Figure 5It is an exploded view of a double-pedal caster in one embodiment of the utility model;

[0038] Figure 6 It is a partial enlarged view of the foot column locking assembly in one embodiment of the utility model;

[0039] Figure 7 It is a partial exploded view of a double-pedal caster in one embodiment of the utility model.

[0040] Reference table of reference numerals:

[0041] Installation housing 1: first hinge point 11, sinking surface 12, notch 13, limit plate 14;

[0042] Pulley 2;

[0043] First pedal 3: first convex portion 31;

[0044] Second pedal 4: first concave part 41, second convex part 42, second concave part 43, fourth convex part 44, stopper 45;

[0045] Linkage member 5: a third protrusion 51, a first tooth portion 52, a second tooth portion 53, and a return spring 54;

[0046] The foot column locking assembly 6 includes a mounting column 61, a first gear ring 62, a foot column bearing 63, a compression spring 64, a cover plate 65, and a pad 66;

[0047] Pulley locking assembly 7: locking wheel 71 and second gear ring 711 . DETAILED DESCRIPTION

[0048] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings.

[0049] It is easy to understand that according to the technical solution of the utility model, without changing the essential spirit of the utility model, a variety of structural modes and implementation modes can be replaced by those skilled in the art. Therefore, the following specific implementation methods and drawings are only exemplary descriptions of the technical solution of the utility model, and should not be regarded as the entirety of the utility model or as a limitation or restriction on the technical solution of the utility model.

[0050] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. They are relative concepts and may change accordingly according to different positions and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0051] In some embodiments of the present invention, Figure 1 and Figure 3As shown, the double-pedal caster comprises a mounting housing 1, a pulley 2 and a wheel brake component, the wheel brake component comprises a first pedal 3, a second pedal 4 and a locking unit, the first pedal 3 and the second pedal 4 are both rotatably mounted on the mounting housing 1, the pulley 2 is rotatably connected to the mounting housing 1, and the mounting housing 1 is used to be rotatably connected to a foot post (not shown);

[0052] The first pedal 3 and the second pedal 4 are linked to each other. When the first pedal 3 is stepped on, the second pedal 4 is lifted up, and the locking unit is driven to unlock the pulley 2 and the foot column at the same time; when the second pedal 4 is stepped on, the first pedal 3 is lifted up, and the locking unit is driven to lock the pulley 2 and the foot column at the same time.

[0053] Specifically, Figure 1 As shown, Figure 1 It is a double-pedal caster in the brake-released state. At this time, the first pedal 3 is stepped on, and the second pedal 4 is tilted. The second pedal 4 drives the locking unit to unlock the pulley 2 and the foot column at the same time.

[0054] The locking unit is at least partially installed in the installation housing 1 , and the locking unit is connected to the first pedal 3 and the second pedal 4 .

[0055] There are two pulleys 2, one on the left and one on the right side of the mounting housing 1. In the brake-released state, the pulley 2 can rotate relative to the mounting housing 1, and the pulley 2 rotates around the transverse axis. When the pulley 2 rolls, the double-pedal caster can move on the ground.

[0056] The foot post is an external mounting part for installing a double-pedal caster, such as a table leg, a bed leg or a furniture leg. When the brake is released, the foot post is rotatably connected to the mounting shell 1, and the foot post rotates around the longitudinal axis. When the foot post rotates, the direction of the double-pedal caster is adjusted.

[0057] like Figure 2 As shown, Figure 2 The double-pedal caster is in the wheel brake state, at this time, the second pedal 4 is stepped on, the first pedal 3 is tilted, and the second pedal 4 can lock the unit to lock the pulley 2 and the foot column at the same time. At this time, the double-pedal caster is completely locked and can neither roll nor turn.

[0058] In this embodiment, the first pedal 3 and the second pedal 4 are linked to realize the switching between wheel braking and brake release by stepping only. The user does not need to put the foot under the wheel brake member to lift the wheel brake member to achieve the switching. The space for the user to step from top to bottom is large, and there is no restriction on the size and model of shoes. Therefore, the user's operation is convenient, and the wheel braking and brake release operations can be quickly achieved.

[0059] Furthermore, if Figure 1 , Figure 3 and Figure 7As shown, the first pedal 3 is located above the second pedal 4, a first hinge point 11 is provided on the surface of the mounting housing 1, a sunken surface 12 is provided below the first hinge point, and the first pedal 3 is hinged to the first hinge point 11;

[0060] After the first pedal 3 is stepped on, the first pedal 3 fits with the sunken surface 12, and the second pedal 4 tilts upward and docks with the first pedal 3;

[0061] After the second pedal 4 is stepped on, the first pedal 3 tilts upward and separates from the sunken surface 12 .

[0062] Specifically, Figure 7 As shown, the surface of the mounting housing 1 is provided with a first hinge point 11, the first pedal 3 is rotatably connected to the first hinge point 11, and the second pedal 4 is coaxially rotatably connected to the center of the mounting housing 1 through the mounting shaft 8. The sunken surface 12 is located on the surface of the mounting housing 1 and is sunken toward the center compared with other outer surfaces.

[0063] like Figure 1 As shown, in the brake release state, the first pedal 3 is stepped on, the first pedal 3 is fitted with the sinking surface 12, and the second pedal 4 is docked with the first pedal 3, just covering the sinking surface 12, and the outer surface of the first pedal 3 and the other surfaces of the mounting housing 1 just form a complete arc surface, so that the first pedal 3 and the mounting housing 1 form a whole, and only the second pedal 4 is tilted from the appearance. When the wheel brake is needed, the first pedal 3 will not affect the user's operation, and the user can only step on the second pedal 4 to implement the wheel brake.

[0064] like Figure 3 As shown, when the second pedal 4 is stepped on, the first pedal 3 is lifted and separated from the sunken surface 12. The sunken surface 12 can shield the internal structure of the mounting housing 1, preventing dust, hair, etc. from entering the interior of the mounting housing 1 and affecting the service life of the caster.

[0065] Furthermore, if Figure 2 , Figure 4 and Figure 5 As shown, the locking unit includes a linkage 5, a foot locking assembly 6 and a pulley locking assembly 7;

[0066] After the second pedal 4 is stepped on, the second pedal 4 drives the linkage member 5 to push upward, and the linkage member 5 contacts and locks with the foot column locking assembly 6 and the pulley locking assembly 7;

[0067] After the first pedal 3 is stepped on, the first pedal 3 drives the second pedal 4 to tilt upward, and the linkage member 5 falls back and is separated from the foot locking assembly 6 and the pulley locking assembly 7 and unlocked.

[0068] Specifically, Figure 5As shown, the foot locking assembly 6 is installed in the installation housing 1 and is used to connect with the foot.

[0069] The pulley locking assembly 7 is mounted on the pulley 2 and connected to the linkage 5;

[0070] The linkage member 5 is installed in the installation shell 1 and moves up and down in the longitudinal direction in the installation shell 1. When the linkage member 5 is pushed upward, the linkage member 5 contacts the foot locking assembly 6 and the pulley locking assembly 7, and locks the foot locking assembly 6 and the pulley locking assembly 7, thereby realizing the locking of the foot and the pulley 2.

[0071] When the linkage member 5 falls back downward, the linkage member 5 is separated from the foot locking assembly 6 and the pulley locking assembly 7, thereby unlocking the foot locking assembly 6 and the pulley locking assembly 7, and the foot and the pulley 2 can rotate freely again.

[0072] Furthermore, if Figure 2 , Figure 4 and Figure 7 As shown, the first pedal 3 includes a first convex portion 31, and the second pedal 4 includes a first concave portion 41 and a second convex portion 42;

[0073] The linkage member 5 includes a third protrusion 51, and the second pedal 4 includes a second concave portion 43 and a fourth protrusion 44;

[0074] After the second pedal 4 is stepped on, the second convex portion 42 pushes the first convex portion 31 out of the first concave portion 41, the first pedal 3 tilts upward, the fourth convex portion 44 pushes the third convex portion 51 out of the second concave portion 43, and the fourth convex portion 44 pushes the linkage member 5 upward;

[0075] After the first pedal 3 is stepped on, the first protrusion 31 enters into the first recess 41 and pushes the second pedal 4 to tilt upward, the third protrusion 51 falls back into the second recess 43, and the linkage member 5 falls back downward.

[0076] Specifically, Figure 7 As shown, the first pedal 3 and the second pedal 4 are at least partially installed inside the linkage member 5. The first protrusion 31 of the first pedal 3 can be inserted into the first recess 41 of the second pedal 4, and the third protrusion 51 of the linkage member 5 can be inserted into the second recess 43 of the second pedal 4. Therefore, the first pedal 3, the second pedal 4 and the linkage member 5 can be linked to each other, so as to realize the up and down movement of the linkage member 5, and finally realize the locking or unlocking of the foot column locking assembly 6 and the pulley locking assembly 7.

[0077] like Figure 2As shown, in the brake release state, after the first pedal 3 is stepped on, the first protrusion 31 enters into the first recess 41 and pushes the second pedal 4 to tilt upward. At the same time, the third protrusion 51 of the linkage 5 enters downward into the second recess 43 of the second pedal 4 under the action of the return spring 54.

[0078] like Figure 4 As shown, in the wheel brake state, after the second pedal 4 is stepped on, the second pedal 4 moves along Figure 4 The second protrusion 42 pushes the first protrusion 31 out of the first recess 41, thereby pushing the first pedal 3 upward. Figure 4 At the same time, the fourth protrusion 44 pushes the third protrusion 51 of the linkage member 5 out of the second recess 43 of the second pedal 4, and the fourth protrusion 51 pushes the linkage member 5 upward, the linkage member 5 presses the return spring 54 upward, and the linkage member 5 is locked with the foot locking assembly 6 and the pulley locking assembly 7.

[0079] In this embodiment, the internal mechanical structure of the first pedal 3, the second pedal 4 and the linkage member 5 realizes mutual linkage, does not require complex structures and other transmission structures, has a stable structure, and has lower costs.

[0080] Furthermore, if Figure 4 , Figure 5 and Figure 6 As shown, the foot column locking assembly 6 includes a mounting column 61, a first gear ring 62, a foot column bearing 63 and a compression spring 64;

[0081] The first gear ring 62 and the compression spring 64 are both sleeved on the outside of the mounting column 61, the compression spring 64 is located above the first gear ring 62, the foot column bearing 63 is installed between the mounting column 61 and the mounting housing 1, and the mounting column 61 is fixedly connected to the foot column;

[0082] The linkage member 5 is provided with a first tooth portion 52. When the linkage member 5 is lifted up, the first tooth portion 52 contacts the first gear ring 62, and the first tooth portion 52 pushes the first gear ring 62 upward, and the compression spring 64 is compressed. When the mounting column 61 rotates until the first gear ring 62 is aligned with the first tooth portion 52, the compression spring 64 pushes the first gear ring 62 downward to mesh with the first tooth portion 52.

[0083] When the linkage member 5 falls back, the first tooth portion 52 is separated from the first gear ring 62 and unlocked.

[0084] Specifically, Figure 5As shown, the mounting column 61 is cylindrical and is used to be fixedly connected to the foot column. The first gear ring 62, the foot column bearing 63 and the compression spring 64 are all sleeved on the outside of the mounting column 61. The foot column locking assembly 6 also includes a cover plate 65, the foot column bearing 63 is sleeved on the outside of the mounting column 61, and the cover plate 65 covers the top of the foot column bearing 63.

[0085] like Figure 4 As shown, the foot column bearing 63 is installed between the mounting housing 1 and the mounting column 61 , so that the mounting column 61 can rotate relative to the mounting housing 1 .

[0086] like Figure 6 As shown, the linkage member 5 is provided with a first tooth portion 52 , and the first tooth portion 52 can cooperate with the first gear ring 62 to achieve locking.

[0087] When the linkage member 5 is lifted up, the first tooth portion 52 contacts the first gear ring 62 first. At this time, the first tooth portion 52 and the first gear ring 62 are not necessarily exactly engaged. The convex teeth of the first tooth portion 52 may contact the convex teeth of the first gear ring 62.

[0088] At this time, the first toothed portion 52 of the linkage member 5 pushes the first gear ring 62 upward, and the compression spring 64 is compressed, so that the first gear ring 62 and the first toothed portion 52 can still rotate relative to each other. When the mounting post 61 rotates a small distance so that the convex teeth of the first gear ring 62 are aligned with the concave teeth of the first toothed portion 52, the compression spring 64 pushes the first gear ring 62 downward to mesh with the first toothed portion 52, thereby locking the foot post locking assembly 6.

[0089] When the linkage member 5 falls back downward, the first tooth portion 52 separates from the first gear ring 62 , and the foot locking assembly 6 can rotate relative to the mounting housing 1 together with the foot.

[0090] In this embodiment, since the compression spring 64 is provided, the first tooth portion 52 and the first gear ring 62 can be automatically aligned and meshed, thereby increasing the stability of the locking.

[0091] Preferably, rectangular teeth are provided on the first gear ring 62 and the first tooth portion 52. The rectangular teeth are larger in width and thickness, and are more stable when locked. The teeth are not easy to slip, but the rectangular teeth are not easy to align. In this embodiment, the compression spring 64 can realize that the first tooth portion 52 and the first gear ring 62 can be automatically aligned and meshed, and a more stable locking effect is achieved.

[0092] Furthermore, if Figure 4-6 As shown, a pad 66 is arranged above the foot column bearing 63, and the pad 66 is located below the cover plate 65. The pad 66 is annular and is used to increase the placement surface of the inner ring of the foot column bearing 63, and part of the structure of the mounting column 61 is placed on the pad 66.

[0093] Furthermore, if Figure 5 As shown, the pulley locking assembly 7 includes a locking wheel 71, the locking wheel 71 is rotatably connected to the mounting housing 1, the outer ring of the locking wheel 71 is fixedly connected to the pulley 2, the inner ring of the locking wheel 71 is provided with a second gear ring 711, and the linkage member 5 is provided with a second tooth portion 53;

[0094] When the linkage member 5 is lifted up, the second tooth portion 53 meshes with the second gear ring 711 to lock the pulley 2;

[0095] When the linkage member 5 falls back, the second tooth portion 53 separates from the second gear ring 711 , unlocking the pulley 2 .

[0096] Specifically, there are two locking wheels 71, which are arranged on the left and right sides of the mounting housing 1 and are mounted on the inner side of the pulley 2. The locking wheel 71, the pulley 2 and the mounting housing 1 are all mounted on the same axis through the mounting shaft 8. The second tooth portion 53 of the linkage member 5 extends out of the mounting housing 1 and faces the locking wheel 71.

[0097] Correspondingly, the second tooth portions 53 also have two. When the linkage member 5 is lifted up, the second tooth portions 53 mesh with the second gear ring 711 to lock the pulley 2.

[0098] When the linkage member 5 falls back, the second tooth portion 53 separates from the second gear ring 711 , unlocking the pulley 2 .

[0099] Preferably, triangular teeth are provided on both the second gear ring 711 and the second tooth portion 53. The second gear ring 711 and the second tooth portion 53 are easy to cooperate with each other, so that the pulley 2 can be stopped in time.

[0100] Furthermore, if Figure 7 As shown, a notch 13 is provided at the bottom of the installation housing 1 , and the linkage member 5 enters through the notch 13 and is installed in the installation housing 1 .

[0101] The linkage member 5 is connected to the mounting housing 1 through the mounting shaft 8, and the position where the mounting shaft 8 passes through the linkage member 5 is set as an elliptical hole to facilitate the up and down movement of the linkage member 5. After the linkage member 5 is installed in the mounting housing 1, the position of the gap 13 is filled, and the gap 13 also provides space for the linkage member 5 to move up and down.

[0102] Furthermore, a limiting plate 14 arranged in the longitudinal direction is provided at the edge of the notch 13 , and the second tooth portion 53 is installed between two limiting plates 14 .

[0103] Specifically, Figure 7As shown, there are two limit plates 14 on the left and right sides of the mounting housing 1, one second tooth portion 53 is installed between two of the limit plates 14, and the other second tooth portion 53 is installed between the other two limit plates 14. The limit plates 14 can limit the second tooth portion 53 to only move up and down, thereby limiting the entire linkage member 5 to only move in the up and down directions.

[0104] The utility model realizes the switching between wheel braking and brake release only by stepping on the first pedal and the second pedal is linked, which is convenient for the user to operate and can quickly realize the wheel braking and brake release operations.

[0105] The above description is only the principle and preferred embodiment of the utility model. It should be pointed out that for ordinary technicians in this field, on the basis of the principle of the utility model, several other variations can be made, which should also be regarded as the protection scope of the utility model.

Claims

1. A double-pedal caster, comprising a mounting housing, a pulley and a wheel brake, characterized in that: The wheel brake member comprises a first pedal, a second pedal and a locking unit, the first pedal and the second pedal are both rotatably mounted on the mounting housing, the pulley is rotatably connected to the mounting housing, and the mounting housing is used to be rotatably connected to the foot column; The first pedal and the second pedal are linked to each other. When the first pedal is stepped on, the second pedal is lifted up and the locking unit is driven to unlock the pulley and the foot column at the same time; when the second pedal is stepped on, the first pedal is lifted up and the locking unit is driven to lock the pulley and the foot column at the same time.

2. The double-pedal caster according to claim 1, characterized in that: The first pedal is located above the second pedal, a first hinge point is provided on the surface of the mounting housing, a sunken surface is provided below the first hinge point, and the first pedal is hinged to the first hinge point; After the first pedal is stepped on, the first pedal fits with the sunken surface, and the second pedal tilts upward and docks with the first pedal; After the second pedal is stepped on, the first pedal tilts upward and separates from the sunken surface.

3. The double-pedal caster according to claim 1, characterized in that: The locking unit includes a linkage, a foot locking assembly and a pulley locking assembly; After the second pedal is stepped on, the second pedal drives the linkage member to push upward, and the linkage member contacts and locks with the foot column locking assembly and the pulley locking assembly; After the first pedal is stepped on, the first pedal drives the second pedal to tilt upward, and the linkage member falls back and is separated and unlocked from the foot column locking assembly and the pulley locking assembly.

4. The double-pedal caster according to claim 3, characterized in that: The first pedal includes a first convex portion, and the second pedal includes a first concave portion and a second convex portion; The linkage member includes a third convex portion, and the second pedal includes a second concave portion and a fourth convex portion; After the second pedal is stepped on, the second convex portion pushes the first convex portion to disengage from the first concave portion, the first pedal tilts upward, the fourth convex portion pushes the third convex portion to disengage from the second concave portion, and the fourth convex portion pushes the linkage member upward; After the first pedal is stepped on, the first convex portion enters into the first concave portion and pushes the second pedal to tilt upward, the third convex portion falls back into the second concave portion, and the linkage member falls back downward.

5. The double-pedal caster according to claim 3, characterized in that: The foot column locking assembly includes a mounting column, a first gear ring, a foot column bearing and a compression spring; The first gear ring and the compression spring are both sleeved on the outside of the mounting column, the compression spring is located above the first gear ring, the foot column bearing is installed between the mounting column and the mounting shell, and the mounting column is fixedly connected to the foot column; The linkage member is provided with a first tooth portion. When the linkage member is lifted up, the first tooth portion contacts the first gear ring, and the first tooth portion pushes the first gear ring upward, and the compression spring is compressed. When the mounting column is rotated until the first gear ring is aligned with the first tooth portion, the compression spring pushes the first gear ring downward to engage with the first tooth portion. When the linkage member falls back, the first tooth portion is separated from the first gear ring and unlocked.

6. The double-pedal caster according to claim 5, characterized in that: Rectangular teeth are arranged on the first gear ring and the first gear portion.

7. The double-pedal caster according to claim 3, characterized in that: The pulley locking assembly comprises a locking wheel, the locking wheel is rotatably connected to the mounting housing, the outer ring of the locking wheel is fixedly connected to the pulley, the inner ring of the locking wheel is provided with a second gear ring, and the linkage member is provided with a second tooth portion; When the linkage member is lifted up, the second tooth portion meshes with the second gear ring to lock the pulley; When the linkage member falls back, the second tooth portion is separated from the second gear ring, unlocking the pulley.

8. The double-pedal caster according to claim 7, characterized in that: Triangular teeth are arranged on the second gear ring and the second gear portion.

9. The double-pedal caster according to claim 7, characterized in that: A notch is provided at the bottom of the installation shell, and the linkage member enters through the notch and is installed in the installation shell.

10. The double-pedal caster according to claim 8, characterized in that: The edge of the notch is provided with a limiting plate arranged in the longitudinal direction, and the second tooth portion is installed between two limiting plates.

Images