Trundle structure

Abstract

The utility model discloses a caster structure, which relates to the technical field of casters, and is characterized by comprising a mounting bottom plate, a mounting frame and a return structure, a cam shaft part is arranged on the back surface of the mounting bottom plate; the mounting frame is rotationally mounted on the back face of the mounting bottom plate in the axis direction of the cam shaft part, and a wheel body is connected to the end, away from the mounting bottom plate, of the mounting frame. According to the technical scheme provided by the utility model, the central main shaft of the trundle structure adopts the cam structure, the elastic deformation part and the follow-up part are matched for use, and the follow-up part is extruded around the peripheral side end of the cam shaft part to rotate by utilizing the elastic deformation part; and meanwhile, the mounting frame rotates and is used along with the follow-up part, so that the trundle structure has an automatic return universal function, the operation is simple, the manufacturing cost is low, the effect of automatically steering to the required direction can be realized without pushing by an assistant, and the practicability is improved.

Description

Technical Field

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

[0002] Casters is a general term, including movable casters, fixed casters and movable casters with brakes; movable casters are what we call universal wheels, and their structure allows 360-degree rotation; fixed casters are also called fixed casters, which have no rotating structure and cannot turn; usually the two types of casters are used in combination, for example, the structure of a trolley is two fixed wheels in the front and two universal wheels in the back near the pushing armrest.

[0003] Existing casters that can automatically return are mostly divided into two types. One type requires the user's assistance in pushing the return, and has a large turning range, which can easily cause inconvenience; the other type uses electronic control devices such as PCL controllers and sets detection devices such as optical path detectors to achieve automatic return. This method has a complex overall design and high cost. In view of this, we propose a caster structure to solve the above problems. Utility Model Content

[0004] The main purpose of the utility model is to provide a caster structure, aiming to provide a caster structure with simple structure, low use cost and the ability to return to its original position ingeniously.

[0005] In order to achieve the above-mentioned purpose, the caster structure proposed by the utility model is characterized by comprising:

[0006] A mounting base plate, wherein a camshaft portion is provided on the back side of the mounting base plate;

[0007] A mounting frame is rotatably mounted on the back of the mounting base plate along the axis direction of the cam shaft portion, and a wheel body is connected to one end of the mounting frame away from the mounting base plate; and

[0008] A return structure, comprising an elastic deformation part and a follower part, wherein the elastic deformation part is arranged between the follower part and the mounting frame, and the follower part can rotate with the mounting frame and always abuts against the circumferential side end of the cam shaft part;

[0009] The mounting frame rotates forwardly, and the follower portion follows the forward rotation around the contour of the camshaft portion and moves radially outward along the camshaft portion, so that the elastic deformation portion is deformed, and the elastic deformation portion is elastically reset to push the follower portion to move radially inward along the camshaft portion and rotate around the contour of the camshaft portion.

[0010] In one embodiment, the elastic deformation portion includes a spring, and the follower portion includes a positioning sleeve;

[0011] The positioning sleeve is located between the mounting frame and the camshaft portion and abuts against the contour of the camshaft portion. The spring sleeve is arranged on the outer peripheral side of the positioning sleeve. Both ends of the spring are fixed to the mounting frame and the opposite sides of the positioning sleeve.

[0012] In one embodiment, the return structure further includes a support portion, which is disposed on the mounting frame and is used to support the elastic deformation portion and the follower portion.

[0013] In one embodiment, the support portion is configured as a screw;

[0014] The mounting frame is provided with a through hole, and both ends of the screw rod are penetrated along the through hole to the outside of the mounting frame, and a locking nut is sleeved on one end of the screw rod located outside the mounting frame.

[0015] In one embodiment, the mounting frame further includes a shock absorbing portion;

[0016] The shock absorbing part is arranged on the mounting frame so as to reduce the shock of the wheel body on the mounting frame.

[0017] In one embodiment, the shock absorbing part includes a shock absorbing block, a shock absorbing spring, a locking rod and two mounting arms;

[0018] The shock-absorbing block is movably arranged inside the mounting frame, the two end surfaces on opposite sides of the two mounting arms are respectively fixed to the two end surfaces opposite to the shock-absorbing block, the two ends of the shock-absorbing spring are respectively fixed to the end surface of the mounting frame facing the shock-absorbing block and the inner wall of the shock-absorbing block, the locking rod is arranged along one end of the shock-absorbing block away from the shock-absorbing spring, the two ends of the locking rod are penetrated to the external threaded installation of the mounting frame, and the two mounting arms are fixed to the two ends on the axial side of the wheel body.

[0019] In one embodiment, the mounting frame further includes a protective shell, and the protective shell is fixed to one end of the mounting frame along the diameter direction of the wheel body.

[0020] In one embodiment, the caster structure further includes a steering portion, which is disposed between the mounting base plate and the mounting frame and is used for rotating the mounting frame.

[0021] In one embodiment, the steering unit includes two steering wheels and two sets of steering balls;

[0022] The two steering wheels are arranged along the axis direction of the camshaft part, one of the two steering wheels is rotatably mounted on the back of the mounting base plate, the two sets of steering balls are respectively located between the two steering wheels and the mounting base plate, and the mounting frame is fixed to one of the two steering wheels close to the mounting base plate;

[0023] The cross sections of the two steering wheels along their thickness directions are curved surfaces.

[0024] In one embodiment, the steering portion further comprises a protection strip and a jacket;

[0025] There are four jackets, two of which are adapted to be installed in one of the two groups of steering balls, and the protection strip is embedded between the mounting base plate and one of the two steering wheels close to the mounting base plate.

[0026] The technical solution of the utility model adopts a cam structure to set the central spindle of the caster structure, cooperates with the use of the elastic deformation and the follower part, and utilizes the elastic deformation part to make the follower part rotate around the circumferential end of the cam shaft part by squeezing, and at the same time the mounting frame rotates with the follower part, so that the caster structure has a universal function of automatic return, simple operation and low manufacturing cost, and can achieve the effect of automatic steering to the desired direction without the need for an assistant to push, thereby improving practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0028] Figure 1 A structural schematic diagram of an embodiment of a caster structure provided by the utility model;

[0029] Figure 2 A structural schematic diagram of another embodiment of the caster structure provided by the utility model;

[0030] Figure 3 A structural schematic diagram of yet another embodiment of the caster structure provided by the utility model;

[0031] Figure 4 For this utility model Figure 1 Schematic cross-sectional view of ;

[0032] Figure 5 For this utility model Figure 2 Schematic cross-sectional view of ;

[0033] Figure 6 For this utility model Figure 3 Schematic cross-section of .

[0034] Description of Figure Numbers:

[0035] 100. Caster structure; 1. Mounting base plate; 2. Mounting frame; 21. Protective shell; 22. Shock-absorbing part; 221. Shock-absorbing block; 222. Shock-absorbing spring; 223. Locking rod; 224. Mounting arm; 3. Return structure; 31. Elastic deformation part; 311. Spring; 32. Follower part; 321. Positioning sleeve; 33. Support part; 331. Screw rod; 332. Locking nut; 4. Camshaft part; 5. Wheel body; 6. Steering part; 61. Steering wheel; 62. Steering ball; 63. Protective strip; 64. Jacket.

[0036] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0039] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0040] Casters is a general term, including movable casters, fixed casters and movable casters with brakes; movable casters are what we call universal wheels, and their structure allows 360-degree rotation; fixed casters are also called fixed casters, which have no rotating structure and cannot turn; usually the two types of casters are used in combination, for example, the structure of a trolley is two fixed wheels in the front and two universal wheels in the back near the pushing armrest.

[0041] There are two types of existing casters that can automatically return to their original position. One type requires the user's assistance in pushing the caster back to its original position, and has a large turning range, which can easily cause inconvenience. The other type uses an electronic control device such as a PCL controller and a detection device such as an optical path detector to achieve automatic return. This method has a complex overall design and high cost. In view of this, we propose a caster structure to solve the above problems.

[0042] See also Figure 1 In one embodiment of the utility model, the caster structure 100 includes a mounting base plate 1, a mounting frame 2 and a return structure 3, wherein a camshaft portion 4 is provided on the back of the mounting base plate 1; the mounting frame 2 is rotatably mounted on the back of the mounting base plate 1 along the axial direction of the camshaft portion 4, and a wheel body 5 is connected to one end of the mounting frame 2 away from the mounting base plate 1; the return structure 3 includes an elastic deformation portion 31 and a follower portion 32, wherein the elastic deformation portion 31 is provided between the follower portion 32 and the mounting base plate The following part 32 can rotate with the mounting frame 2 and always abut against the circumferential side end of the camshaft part 4; when the mounting frame 2 rotates forward, the following part 32 follows the forward rotation around the contour of the camshaft part 4 and moves radially outward along the camshaft part 4 to deform the elastic deformation part 31, and the elastic deformation part 31 is elastically reset to push the following part 32 to move radially inward along the camshaft part 4 and rotate around the contour of the camshaft part 4.

[0043] It can be understood that in some embodiments, when using a conventional universal caster, the user needs to push the body to rotate. If the body is large or the load is heavy, it is difficult for the user to rotate the body alone, and an assistant is needed to help push it. In addition, the existing electronic control method for rotating the body has complex accessories for installation, which not only increases the cost but also increases the difficulty of installation. Therefore, this embodiment adopts the method of squeezing the follower part 32 and the circumferential end of the camshaft part 4, and utilizes the tension of the elastic deformation part 31 to drive the follower part 32 to rotate, thereby realizing the automatic rotation of the mounting frame 2, so that the caster structure 100 has the function of a universal caster during use, with a simple structure and low cost. The user does not need to use electronic control means to control the rotation, which reduces the production cost and operation difficulty, and can achieve the effect of automatic steering to the desired direction without the need for an assistant to push, thereby improving practicality.

[0044] It should be explained that the caster structure 100 described in this embodiment is suitable for a trolley device with movement direction requirements, and is generally used in conjunction with a transport tool such as a turtle cart or an AGV cart.

[0045] It should be added that the interior of the mounting base plate 1 is provided with mounting slots to facilitate installation and fixation with a trolley device, such as a turtle vehicle or an AGV vehicle.

[0046] During use, when the mounting base plate 1 is not subjected to gravity and the wheel body 5 is suspended in the air off the ground, the elastic deformation portion 31 restores the tension to drive the mounting frame 2 to return to its original position, so that the caster structure 100 realizes the universal function of automatic return; when the wheel body 5 is in contact with the ground and the mounting base plate 1 is subjected to gravity, it can also be used as a universal caster.

[0047] Further, the elastic deformation part 31 includes a spring 311, and the follower part 32 includes a positioning sleeve 321; the positioning sleeve 321 is located between the mounting frame 2 and the camshaft part 4 and abuts against the contour of the camshaft part 4, the spring 311 is sleeved on the outer peripheral side of the positioning sleeve 321, and the two ends of the spring 311 are fixed to the opposite sides of the mounting frame 2 and the positioning sleeve 321. It can be understood that in some embodiments, the positioning sleeve 321 is only installed on the end surface of the spring 311 and does not extend to the inside of the spring 311, which is easy to cause uncertainty in the force exerted by the spring 311, thereby affecting the extrusion of the camshaft part 4. Therefore, in this embodiment, through the matching arrangement of the spring 311 and the positioning sleeve 321, one end of the positioning sleeve 321 extends to the inside of the spring 311, supporting the spring 311, and when the positioning sleeve 321 and the camshaft part 4 are extruded by the elastic force of the spring 311, the elastic force can be effectively exerted.

[0048] In addition, the return structure 3 further includes a support portion 33, which is disposed on the mounting frame 2 to support the elastic deformation portion 31 and the follower portion 32. It is understandable that in some embodiments, the lack of support for the elastic deformation portion 31 and the follower portion 32 may easily cause uncertainty in the position of the force during the extrusion process. Therefore, in this embodiment, in order to make the elastic deformation portion 31 and the follower portion 32 drive the mounting frame 2 to be more stable during rotation, the support portion 33 is provided to assist the support of the elastic deformation portion 31 and the follower portion 32, so as to more safely allow the caster structure 100 to achieve an automatic return effect.

[0049] Furthermore, the support portion 33 is configured as a screw rod 331; a through hole is provided on the mounting frame 2, and both ends of the screw rod 331 are extended along the through hole to the outside of the mounting frame 2, and a locking nut 332 is sleeved on one end of the screw rod 331 located outside the mounting frame 2. It can be understood that in some embodiments, the structure for supporting the follower portion 32 and the elastic deformation portion 31 is fixedly installed, which results in that the subsequent parts cannot be separated and replaced due to damage, and can only be replaced as a whole, increasing the use cost. Therefore, in this embodiment, through the provision of the screw rod 331, the screw rod 331 can be detached from the mounting frame 2, thereby facilitating the replacement and maintenance of the follower portion 32, thereby ensuring the normal use of the caster structure 100 and reducing the use cost.

[0050] It should be supplemented that the screw 331 is preferably an M10 screw.

[0051] See also Figure 2 In another embodiment of the utility model, the mounting frame 2 further includes a shock absorbing portion 22; the shock absorbing portion 22 is disposed on the mounting frame 2 to reduce shock of the wheel body 5 on the mounting frame 2. It is understandable that in some embodiments, the caster structure 100 is configured in a single manner and does not have a buffering and shock absorbing function, and cannot be used better when facing the use requirements of different scenes. Therefore, in order to realize the functionality of the caster structure 100, this embodiment can also select different wheel bodies 5 for installation and use to realize the use requirements of different scenes.

[0052] Furthermore, the shock absorbing part 22 includes a shock absorbing block 221, a shock absorbing spring 222, a locking rod 223 and two mounting arms 224; the shock absorbing block 221 is movably arranged inside the mounting frame 2, and the two end surfaces on the opposite sides of the two mounting arms 224 are respectively fixed to the two end surfaces opposite to the shock absorbing block 221, and the two ends of the shock absorbing spring 222 are respectively fixed to the end surface of the mounting frame 2 facing the shock absorbing block 221 and the inner wall of the shock absorbing block 221, and the locking rod 223 is arranged along one end of the shock absorbing block 221 away from the shock absorbing spring 222, and the two ends of the locking rod 223 are penetrated to the external threaded installation of the mounting frame 2, and the two mounting arms 224 are fixed to the two ends on the axial side of the wheel body 5. In order to improve the practicality of the caster structure 100 , this embodiment achieves a shock-absorbing effect for the wheel body 5 by setting the shock-absorbing block 221 , the shock-absorbing spring 222 , the locking rod 223 and the two mounting arms 224 , thereby increasing the application surface of the caster structure 100 .

[0053] When in use, the shock absorbing block 221 squeezes the shock absorbing spring 222 , that is, the wheel body 5 squeezes the shock absorbing spring 222 , thereby providing a buffering effect for the caster structure 100 when in use.

[0054] See also Figure 3 In another embodiment of the utility model, the mounting frame 2 further includes a protective shell 21, and the protective shell 21 is fixed to one end of the mounting frame 2 along the diameter direction of the wheel body 5. It can be understood that in some embodiments, the existing mounting frame 2 is usually a separate bracket, lacks protection for the wheel body 5, and is easy to be used dangerously. Therefore, this embodiment protects the wheel body 5 well through the provision of the protective shell 21, thereby improving the safety of the caster structure 100.

[0055] Also, see Figure 4 , Figure 5 and Figure 6 The caster structure 100 further includes a steering portion 6, which is disposed between the mounting base plate 1 and the mounting frame 2 and is used for rotating the mounting frame 2. By disposing the steering portion 6, the mounting frame 2 can rotate more smoothly under the mounting base plate 1.

[0056] Furthermore, the steering portion 6 includes two steering wheels 61 and two groups of steering balls 62; the two steering wheels 61 are arranged along the axial direction of the camshaft portion 4, one of the two steering wheels 61 is rotatably installed on the back side of the mounting base plate 1, the two groups of steering balls 62 are respectively located between the two steering wheels 61 and the mounting base plate 1, and the mounting frame 2 is fixed to one of the two steering wheels 61 close to the mounting base plate 1; the cross-section of the two steering wheels 61 along their thickness direction is a curved surface, which is used to carry the steering balls 62 without causing them to fall.

[0057] It should be noted that if Figure 4 As shown, the mounting base plate 1 is also configured to be a curved surface along its thickness direction, and the mounting base plate 1 and the two steering wheels 61 are arranged along the axial direction of the camshaft portion 4, that is, the mounting base plate 1 and the two steering wheels 61 clamp the two groups of steering balls 62, and the mounting frame 2 is fixed to the steering wheel 61 located in the middle position, so that the mounting frame 2 rotates on the mounting base plate 1;

[0058] like Figure 6 As shown, the curved surface of the mounting base plate 1 is adapted to one of the two steering wheels 61, and the two end surfaces of the mounting frame 2 that are in contact with the two groups of steering balls 62 are both set as curved surfaces, and cooperate with the two steering wheels 61 to clamp the two groups of steering balls 62, so that the mounting frame 2 can rotate in the steering wheel 61 using the steering balls 62, that is, rotate on the mounting base plate 1.

[0059] It can be understood that, in some embodiments, the existing steering part 6 is generally set by a bearing, but the configuration of the bearing is relatively fixed, which makes it inconvenient to change and adjust the structural parts according to different usage requirements. Therefore, in this embodiment, through different combinations of the two steering wheels 61 and the two sets of steering balls 62, different mounting frames 2 can be used, thereby expanding the scope of use of the caster structure 100 and improving practicality.

[0060] Furthermore, the steering part 6 further includes a protection strip 63 and a jacket 64; four jackets 64 are provided, two of the four jackets 64 are adapted to be installed with one of the two groups of steering balls 62, and the protection strip 63 is embedded between the mounting base plate 1 and one of the two steering wheels 61 close to the mounting base plate 1. It can be understood that, in this embodiment, by adding the jacket 64 and the protection strip 63, the smoothness of the rotation is better guaranteed compared with the traditional ball sliding setting, and the falling of foreign matter is blocked, thereby improving the applicability of the caster structure 100.

[0061] It should be noted that if Figure 5 As shown, every two of the clamping sleeves 64 clamp one of the two groups of steering balls 62, and after clamping, they are respectively placed in the gap between the mounting base plate 1 and the two steering wheels 61 to facilitate the rotation of the steering wheels 61. The mounting frame 2 rotates by utilizing the rotation of the steering wheels 61, wherein the clamping sleeve 64 cooperates with the setting of the shock absorbing part 22 to make the rotation of the mounting frame 2 smoother.

[0062] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A caster structure, characterized in that: include: A mounting base plate, wherein a camshaft portion is provided on the back side of the mounting base plate; A mounting frame is rotatably mounted on the back of the mounting base plate along the axis direction of the cam shaft portion, and a wheel body is connected to one end of the mounting frame away from the mounting base plate; and A return structure, comprising an elastic deformation part and a follower part, wherein the elastic deformation part is arranged between the follower part and the mounting frame, and the follower part can rotate with the mounting frame and always abuts against the circumferential side end of the cam shaft part; The mounting frame rotates forwardly, and the follower portion follows the forward rotation around the contour of the camshaft portion and moves radially outward along the camshaft portion, so that the elastic deformation portion is deformed, and the elastic deformation portion is elastically reset to push the follower portion to move radially inward along the camshaft portion and rotate around the contour of the camshaft portion.

2. The caster structure according to claim 1, characterized in that: The elastic deformation part includes a spring, and the follower part includes a positioning sleeve; The positioning sleeve is located between the mounting frame and the camshaft portion and abuts against the contour of the camshaft portion. The spring sleeve is arranged on the outer peripheral side of the positioning sleeve. Both ends of the spring are fixed to the mounting frame and the opposite sides of the positioning sleeve.

3. The caster structure according to claim 1, characterized in that: The return structure further comprises a support portion, which is arranged on the mounting frame and is used to support the elastic deformation portion and the follower portion.

4. The caster structure according to claim 3, characterized in that: The support portion is configured as a screw; The mounting frame is provided with a through hole, and both ends of the screw rod are penetrated along the through hole to the outside of the mounting frame, and a locking nut is sleeved on one end of the screw rod located outside the mounting frame.

5. The caster structure according to claim 1, characterized in that: The mounting frame further includes a shock absorbing portion; The shock absorbing part is arranged on the mounting frame so as to reduce the shock of the wheel body on the mounting frame.

6. The caster structure according to claim 5, characterized in that: The shock absorbing part includes a shock absorbing block, a shock absorbing spring, a locking rod and two mounting arms; The shock-absorbing block is movably arranged inside the mounting frame, the two end surfaces on opposite sides of the two mounting arms are respectively fixed to the two end surfaces opposite to the shock-absorbing block, the two ends of the shock-absorbing spring are respectively fixed to the end surface of the mounting frame facing the shock-absorbing block and the inner wall of the shock-absorbing block, the locking rod is arranged along one end of the shock-absorbing block away from the shock-absorbing spring, the two ends of the locking rod are penetrated to the external threaded installation of the mounting frame, and the two mounting arms are fixed to the two ends on the axial side of the wheel body.

7. The caster structure according to claim 1, characterized in that: The mounting frame also includes a protective shell, and the protective shell is fixed to one end of the mounting frame along the diameter direction of the wheel body.

8. The caster structure according to claim 1, characterized in that: The caster structure also includes a steering portion, which is arranged between the mounting base plate and the mounting frame and is used for rotating the mounting frame.

9. The caster structure according to claim 8, characterized in that: The steering part includes two steering wheels and two sets of steering balls; The two steering wheels are arranged along the axis direction of the camshaft part, one of the two steering wheels is rotatably mounted on the back of the mounting base plate, the two sets of steering balls are respectively located between the two steering wheels and the mounting base plate, and the mounting frame is fixed to one of the two steering wheels close to the mounting base plate; The cross sections of the two steering wheels along their thickness directions are curved surfaces.

10. The caster structure according to claim 9, characterized in that: The steering part also includes a protection strip and a jacket; There are four jackets, two of which are adapted to be installed in one of the two groups of steering balls, and the protection strip is embedded between the mounting base plate and one of the two steering wheels close to the mounting base plate.

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