Trundle with adjustable height

Abstract

The utility model discloses a height-adjustable trundle which comprises a mounting plate capable of being mounted under a vehicle bottom, a mounting disc arranged below the mounting plate, a trundle frame rotationally arranged below the mounting disc, a wheel arranged at the bottom end of the trundle frame, and a bearing pack arranged between the mounting disc and the trundle frame. A first lifting mechanism and a second lifting mechanism are arranged on the mounting plate, a guide group is arranged between the mounting plate and the mounting disc, and a driving mechanism capable of synchronously driving the first lifting mechanism and the second lifting mechanism is arranged in the mounting disc. The caster is supported by the multiple sets of lifting mechanisms, so that the caster has the advantages that the load borne by the caster can be shared through the multiple sets of lifting mechanisms, hinge joints on the lifting mechanisms are not prone to breakage, and therefore the caster can bear more load and is firmer and more durable.

Description

Technical Field

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

[0002] Casters are a general term, including movable casters, fixed casters and movable casters with brakes. Movable casters are also called universal wheels, and their structure allows 360-degree rotation; fixed casters are also called fixed casters, which have no rotating structure and cannot rotate. Usually, the two types of casters are generally 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 push handle.

[0003] For example, the Chinese patent: application number is 2021218092361, and the patent name is a caster with adjustable height, "including a mounting seat, a height adjustment member, a shaft member, and a wheel body rotatably connected to the shaft member, the mounting seat is provided with a mounting structure, the height adjustment member is mainly composed of four connecting arms, two adjustment plates and a long bolt, the four connecting arms are combined into a diamond shape, the two connecting arms at the lower part are respectively hinged to the shaft member, the two connecting arms at the upper part are hinged to the mounting seat, the upper and lower adjacent connecting arms are hinged with the adjustment plate, one of the adjustment plates is provided with a threaded hole, and the other one is provided with a threaded hole. The adjusting plate is provided with a through hole corresponding to the threaded hole, and the two adjusting plates are connected by a long bolt, and the head of the long bolt conflicts with the adjusting plate provided with the through hole. In the above technology, the long bolt rotates to make the adjusting plates approach or move away from each other, thereby controlling the distance between the adjusting plates, so that the link arm on the caster can swing, so that the height of the caster can be adjusted, but the caster is supported only by the link arm in the shape of an eight, and all the weight borne by the caster will be pressed on the link arm in the shape of an eight, so the hinge point on the figure eight is prone to overload and breakage, and the link arm is prone to deformation when loaded, so that the caster cannot work normally. Utility Model Content

[0004] The utility model aims to provide a caster with adjustable height.

[0005] In order to achieve the above purpose, the utility model adopts the following scheme:

[0006] 14. The height-adjustable caster according to claim 13, wherein the caster frame is rotatably provided below the mounting plate, a wheel is provided at the bottom end of the caster frame, a bearing group is provided between the mounting plate and the caster frame, a guide group is provided between the mounting plate and the mounting plate, a first screw is provided on the axis of the bottom of the mounting plate, a first lifting mechanism connected to the first screw is provided on the mounting plate, a connecting rod group is hinged on both sides of the first screw at the bottom of the mounting plate, a second lifting mechanism connected to the connecting rod group is provided on the mounting plate, and a driving mechanism that can synchronously drive the first lifting mechanism and the second lifting mechanism is provided in the mounting plate. The lifting mechanism for adjusting the height of the caster in the utility model is supported by the caster with a single group of link arm structures in an eight-shaped shape instead of a plurality of lifting structures. The advantage of this is that the load borne by the caster can be shared by the plurality of lifting mechanisms, and the hinged nodes on the lifting mechanisms are not easy to break, so that the caster can bear more load and be more sturdy and durable.

[0007] As a further solution of the utility model, the driving mechanism includes a first through groove arranged on the outer wall of the mounting plate, a circular plate is rotatably provided in the first through groove, a first rotating shaft is fixed at one end of the circular plate, and a hexagonal nut is provided at the other end, a first support plate that can support the first rotating shaft is provided on the inner wall of the mounting plate, a first bevel gear that can be engaged with the first lifting mechanism is fixed at one end of the first rotating shaft, and a second bevel gear that can mesh with the second lifting mechanism is fixed on the outer wall of the first rotating shaft.

[0008] As a further solution of the utility model, the first lifting mechanism includes a second through groove located on the axis of the mounting plate and penetrating the mounting plate, a first annular groove coaxial with the second through groove is provided on the inner wall of the mounting plate, the first screw passes through the second through groove, a threaded barrel that can be threadably connected to the first screw is rotatably provided in the first annular groove, and a third bevel gear meshing with the first bevel gear is provided at the top of the threaded barrel.

[0009] As a further solution of the present invention, the second lifting mechanism includes guide grooves symmetrically arranged on the inner wall of the mounting plate on both sides of the first screw rod, second support plates are rotatably provided at both ends of the guide grooves, a second rotating shaft is rotatably provided between the second support plates, external threads are symmetrically provided on the second rotating shaft, a movable plate is symmetrically provided in the guide groove, a threaded hole that can be threadedly connected to the external thread is provided on the movable plate, a fourth bevel gear is provided on the same side of the second rotating shaft and the second bevel gear, a third support plate is provided between the second bevel gear and the fourth bevel gear, a third rotating shaft is rotatably provided on the third support plate, fifth bevel gears that can respectively mesh with the second bevel gear and the fourth bevel gear are fixedly provided at both ends of the third rotating shaft, and a first hinged ear that can be connected to the connecting rod group is provided on the top of the movable plate.

[0010] As an advantageous solution of the present invention, the connecting rod assembly includes second hinged ears arranged at the bottom of the mounting plate and respectively located above the first hinged ears, and a connecting rod is hinged between the first hinged ears and the second hinged ears.

[0011] As an advantageous solution of the utility model, the guide group includes guide rods symmetrically arranged at the bottom of the mounting plate, and a guide cylinder sleeve-connected to the guide rods is fixed on the inner wall of the mounting plate.

[0012] As an advantageous solution of the utility model, a second annular groove is provided on the mounting plate, a sealing plate which can extend into the second annular groove is fixedly provided at the bottom of the second annular groove, and a clearance groove is provided on the sealing plate on the same side of the circular plate.

[0013] As a further solution of the utility model, the bearing group includes an installation groove arranged on the top axis of the caster frame, a bearing outer ring is embedded in the installation groove, a bearing inner ring is rotatably arranged in the bearing outer ring, a ball slide groove is provided between the bearing outer ring and the bearing inner ring, a plurality of balls are arranged in the ball slide groove, and a third rotating shaft rotatably arranged on the axis of the bearing inner ring is fixed to the bottom of the installation plate.

[0014] To sum up, the utility model has the following beneficial effects compared with the prior art: the lifting mechanism for adjusting the height of the casters in the utility model is changed from the original single set of eight-shaped link arm structures to support the casters, and multiple sets of lifting structures are used to support the casters. The advantage of this is that the load borne by the casters can be shared by multiple sets of lifting mechanisms, and the hinged nodes on the lifting mechanisms are not easy to break, so that the casters can bear more loads and are more sturdy and durable. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a three-dimensional view of the utility model.

[0016] Figure 2 This is an exploded view of the utility model.

[0017] Figure 3 This is one of the cross-sectional views of the utility model.

[0018] Figure 4 This is the second cross-sectional view of the utility model.

[0019] Figure 5 This is the third cross-sectional view of the utility model.

[0020] Figure 6 For this utility model Figure 3 Magnified view at A in the middle.

[0021] Description of the accompanying drawings: 1, mounting plate; 2, mounting plate; 3, caster frame; 4, wheel; 200, bearing group; 5, first screw; 40, first lifting mechanism; 60, connecting rod group; 80, second lifting mechanism; 100, driving mechanism; 101, first through groove; 102, circular plate; 103, first rotating shaft; 104, hexagonal nut; 105, first supporting plate; 106, first bevel gear; 107, second bevel gear; 41, second through groove; 42, first annular groove; 43, threaded cylinder; 44, third bevel gear: 81, guide groove: 8 2. Second support plate; 83. Second rotating shaft; 84. External thread; 85. Moving plate: 86. Threaded hole: 87. Fourth bevel gear; 88. Third support plate; 89. Third rotating shaft; 90. Fifth bevel gear: 91. First hinge ear: 61. Second hinge ear; 62. Connecting rod; 21. Guide rod; 22. Guide cylinder: 11. Second annular groove: 12. Sealing plate; 13. Give way groove; 201. Mounting groove: 202. Bearing outer ring: 203. Bearing inner ring; 204. Ball slide groove; 205. Ball: 206. Third rotating shaft. DETAILED DESCRIPTION

[0022] The following specific implementation content provides a variety of different embodiments or examples for implementing the utility model. Of course, these are only embodiments or examples and are not intended to be limiting. In addition, repeated reference numerals may be used in different embodiments, such as repeated numbers and / or letters. These repetitions are for the purpose of simply and clearly describing the utility model and do not represent a specific relationship between the different embodiments and / or structures discussed.

[0023] In addition, space-related words may be used, such as "below", "lower side", "from the inside out", "above", "upper side" and similar words. These relative words are for the convenience of describing the relationship between one element or feature and another element or feature in the drawings. These spatial relative words include different orientations of the device in use or operation, as well as the orientations described in the drawings. The device may be turned to different orientations, rotations or other orientations, and the space-related adjectives used therein may also be interpreted in the same way. Therefore, it cannot be understood as a limitation on the utility model. The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0024] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods: Figures 1 to 6The height-adjustable caster shown in the figure includes a mounting plate 1 that can be installed under a vehicle, a mounting plate 2 is provided below the mounting plate 1, a caster frame 3 is rotatably provided below the mounting plate 2, a wheel 4 is provided at the bottom end of the caster frame 3, a bearing group 200 is provided between the mounting plate 2 and the caster frame 3, a guide group 20 is provided between the mounting plate 1 and the mounting plate 2, a first screw rod 5 is provided on the axis at the bottom of the mounting plate 1, a first lifting mechanism 40 that can be connected to the first screw rod 5 is provided on the mounting plate 2, a connecting rod group 60 is hinged on both sides of the first screw rod 5 at the bottom of the mounting plate 1, a second lifting mechanism 80 that can be connected to the connecting rod group 60 is provided on the mounting plate 2, and a driving mechanism 100 that can synchronously drive the first lifting mechanism 40 and the second lifting mechanism 80 is provided in the mounting plate 2.

[0025] A further embodiment of the driving mechanism 100 in the present utility model: the driving mechanism 100 includes a first through groove 101 arranged on the outer wall of the mounting plate 2, a circular plate 102 is rotatably arranged in the first through groove 101, a first rotating shaft 103 is fixed at one end of the circular plate 102, and a hexagonal nut 104 is arranged at the other end, a first supporting plate 105 that can support the first rotating shaft 103 is arranged on the inner wall of the mounting plate 2, a first bevel gear 106 that can be engaged with the first lifting mechanism 40 is fixed at one end of the first rotating shaft 103, and a second bevel gear 107 that can mesh with the second lifting mechanism 80 is fixed on the outer wall of the first rotating shaft 103. In the initial state, when the user needs to adjust the height of the caster, he only needs to rotate the hexagonal nut 104 with a hexagonal wrench to rotate the first rotating shaft 103, so that the first lifting mechanism 40 and the second lifting mechanism 80 can be controlled to work through the first bevel gear 106 and the second bevel gear 107.

[0026] A further embodiment of the first lifting mechanism 40 in the utility model: the first lifting mechanism 40 includes a second through groove 41 located on the axis of the mounting plate 2 and penetrating the mounting plate 2, and a first annular groove 42 coaxial with the second through groove 41 is provided on the inner wall of the mounting plate 2, the first screw 5 passes through the second through groove 41, and a threaded barrel 43 that can be threadedly connected to the first screw 5 is rotatably provided in the first annular groove 42, and a third bevel gear 44 meshing with the first bevel gear 106 is provided on the top of the threaded barrel 43. When the first rotating shaft 103 rotates, the first bevel gear 106 will simultaneously drive the third bevel gear 44 to rotate, so that the threaded barrel 43 will also rotate, so that the threaded barrel 43 can move the first screw 5 up and down, thereby adjusting the height of the caster.

[0027] A further embodiment of the second lifting mechanism 80 in the utility model: the second lifting mechanism 80 includes a guide groove 81 symmetrically arranged on the inner wall of the mounting plate 2 and located on both sides of the first screw rod 5, a second support plate 82 is rotatably arranged at both ends of the guide groove 81, a second rotating shaft 83 is rotatably arranged between the second support plates 82, an external thread 84 is symmetrically arranged on the second rotating shaft 83, a movable plate 85 is symmetrically arranged in the guide groove 81, a threaded hole 86 that can be threadedly connected to the external thread 84 is arranged on the movable plate 85, a fourth bevel gear 87 is arranged on the same side of the second rotating shaft 83 and the second bevel gear 107, and a second bevel gear 107 is arranged between the second bevel gear 107 and the fourth bevel gear 87. A third support plate 88 is provided in between, and a third rotating shaft 89 is rotatably provided on the third support plate 88. Fifth bevel gears 90 which can respectively mesh with the second bevel gear 107 and the fourth bevel gear 87 are fixedly provided at both ends of the third rotating shaft 89. A first hinge ear 91 which can be connected to the connecting rod group 60 is provided on the top of the movable plate 85. When the first rotating shaft 103 rotates, the second bevel gear 107 can drive the fourth bevel gear 87 to rotate through the fifth bevel gears 90 on both ends of the third rotating shaft 89, so that the second rotating shaft 83 will rotate, and the external thread 84 can drive the movable plate 85 to move along the guide groove 81, so that the connecting rod 62 will swing, thereby adjusting the height of the caster.

[0028] A further embodiment of the second lifting mechanism 80 in the present invention: the connecting rod group 60 includes second hinged ears 61 arranged at the bottom of the mounting plate 1 and respectively located above the first hinged ears 91 , and a connecting rod 62 is hinged between the first hinged ears 91 and the second hinged ears 61 .

[0029] A further embodiment of the guide group 20 in the present invention: the guide group 20 includes a guide rod 21 symmetrically arranged at the bottom of the mounting plate 1, and a guide cylinder 22 is fixed on the inner wall of the mounting plate 2 and is sleeved and connected with the guide rod 21. The cooperation between the guide rod 21 and the guide cylinder 22 can ensure that the caster can only move up and down when adjusting the height, and can also ensure that the load direction borne by the caster is vertically downward.

[0030] A further embodiment of the mounting disk 2 in the utility model: a second annular groove 11 is provided on the mounting disk 2, a sealing plate 12 which can extend into the second annular groove 11 is fixedly provided at the bottom of the second annular groove 11, and a clearance groove 13 is provided on the sealing plate 12 on the same side as the circular plate 102. The sealing plate 12 cooperates with the second annular groove 11 to prevent garbage from entering between the mounting disk 2 and the mounting plate 1 as much as possible.

[0031] A further embodiment of the bearing group 200 in the utility model: the bearing group 200 includes a mounting groove 201 arranged on the top axis of the caster frame 3, a bearing outer ring 202 is embedded in the mounting groove 201, a bearing inner ring 203 is rotatably arranged in the bearing outer ring 202, a ball slide groove 204 is provided between the bearing outer ring 202 and the bearing inner ring 203, a plurality of balls 205 are provided in the ball slide groove 204, and a third rotating shaft 206 rotatably arranged on the axis of the bearing inner ring 203 is fixed at the bottom of the mounting plate 2. The function of the bearing group 200 is to make the caster smoother when rotating 360 degrees.

[0032] When in use: in the initial state, when the user needs to adjust the height of the caster, he only needs to use a hexagonal wrench to rotate the hexagonal nut 104 to rotate the first rotating shaft 103, so that the first lifting mechanism 40 and the second lifting mechanism 80 can be controlled to work through the first bevel gear 106 and the second bevel gear 107. When the first rotating shaft 103 rotates, the first bevel gear 106 will simultaneously drive the third bevel gear 44 to rotate, so that the threaded cylinder 43 will also rotate, so that the threaded cylinder 43 can move the first screw rod 5 up and down, thereby adjusting the height of the caster. When the first rotating shaft 103 rotates, the second bevel gear 107 can drive the third bevel gear 44 to rotate. The fifth bevel gear 90 on both ends of the rotating shaft 89 drives the fourth bevel gear 87 to rotate, so that the second rotating shaft 83 will rotate, and the external thread 84 can drive the movable plate 85 to move along the guide groove 81, so that the connecting rod 62 will swing, thereby adjusting the height of the caster. The guide rod 21 cooperates with the guide cylinder 22 to ensure that the caster can only move up and down when adjusting the height, and can also ensure that the load direction borne by the caster is vertically downward. The sealing plate 12 cooperates with the second annular groove 11 to prevent garbage from entering between the mounting plate 2 and the mounting plate 1 as much as possible. The function of the bearing group 200 is to make the caster smoother when rotating 360 degrees.

[0033] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. The technicians in this industry should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A caster capable of adjusting height, comprising a mounting plate (1) which can be mounted under a vehicle, a mounting plate (2) being provided below the mounting plate (1), a caster frame (3) being rotatably provided below the mounting plate (2), and a wheel (4) being provided at the bottom end of the caster frame (3), characterized in that: A bearing group (200) is provided between the mounting plate (2) and the caster frame (3), a guide group (20) is provided between the mounting plate (1) and the mounting plate (2), a first screw rod (5) is provided on the axis of the bottom of the mounting plate (1), a first lifting mechanism (40) which can be connected to the first screw rod (5) is provided on the mounting plate (2), a connecting rod group (60) is hinged on both sides of the first screw rod (5) at the bottom of the mounting plate (1), a second lifting mechanism (80) which can be connected to the connecting rod group (60) is provided on the mounting plate (2), and a driving mechanism (100) which can synchronously drive the first lifting mechanism (40) and the second lifting mechanism (80) is provided in the mounting plate (2).

2. The height-adjustable caster according to claim 1, characterized in that: The driving mechanism (100) comprises a first through slot (101) arranged on the outer wall of the mounting plate (2); a circular plate (102) is rotatably arranged in the first through slot (101); a first rotating shaft (103) is fixed at one end of the circular plate (102); a hexagonal nut (104) is arranged at the other end; a first supporting plate (105) capable of supporting the first rotating shaft (103) is arranged on the inner wall of the mounting plate (2); a first bevel gear (106) capable of engaging with a first lifting mechanism (40) is fixed at one end of the first rotating shaft (103); and a second bevel gear (107) capable of meshing with a second lifting mechanism (80) is fixed on the outer wall of the first rotating shaft (103).

3. The height-adjustable caster according to claim 2, characterized in that: The first lifting mechanism (40) comprises a second through groove (41) located on the axis of the mounting plate (2) and penetrating the mounting plate (2); a first annular groove (42) coaxial with the second through groove (41) is provided on the inner wall of the mounting plate (2); the first screw rod (5) passes through the second through groove (41); a threaded barrel (43) threadably connected to the first screw rod (5) is rotatably provided in the first annular groove (42); a third bevel gear (44) meshing with the first bevel gear (106) is provided at the top of the threaded barrel (43).

4. The height-adjustable caster according to claim 2, characterized in that: The second lifting mechanism (80) comprises a guide groove (81) symmetrically arranged on the inner wall of the mounting plate (2) and located on both sides of the first screw rod (5); a second support plate (82) is rotatably arranged at both ends of the guide groove (81); a second rotating shaft (83) is rotatably arranged between the second support plates (82); external threads (84) are symmetrically arranged on the second rotating shaft (83); a movable plate (85) is symmetrically arranged in the guide groove (81); a threaded hole (86) which can be threadedly connected to the external thread (84) is arranged on the movable plate (85); A fourth bevel gear (87) is provided on the same side of the second rotating shaft (83) and the second bevel gear (107); a third support plate (88) is provided between the second bevel gear (107) and the fourth bevel gear (87); a third rotating shaft (89) is rotatably provided on the third support plate (88); fifth bevel gears (90) are fixedly provided at both ends of the third rotating shaft (89) and are respectively meshed with the second bevel gear (107) and the fourth bevel gear (87); and a first hinged ear (91) which can be connected to a connecting rod assembly (60) is provided at the top of the movable plate (85).

5. The height-adjustable caster according to claim 4, characterized in that: The connecting rod assembly (60) comprises a second hinged ear (61) arranged at the bottom of the mounting plate (1) and located above the first hinged ear (91), and a connecting rod (62) is hinged between the first hinged ear (91) and the second hinged ear (61).

6. The height-adjustable caster according to claim 1, characterized in that: The guide group (20) comprises a guide rod (21) symmetrically arranged at the bottom of the mounting plate (1), and a guide cylinder (22) sleeved and connected to the guide rod (21) is fixed on the inner wall of the mounting plate (2).

7. The height-adjustable caster according to claim 2, characterized in that: A second annular groove (11) is provided on the mounting plate (2), a sealing plate (12) which can extend into the second annular groove (11) is fixedly provided at the bottom of the second annular groove (11), and a clearance groove (13) is provided on the sealing plate (12) on the same side as the circular plate (102).

8. The height-adjustable caster according to claim 1, characterized in that: The bearing group (200) comprises a mounting groove (201) arranged on the top axis of the caster frame (3), a bearing outer ring (202) is embedded in the mounting groove (201), a bearing inner ring (203) is rotatably arranged in the bearing outer ring (202), a ball slide groove (204) is provided between the bearing outer ring (202) and the bearing inner ring (203), a plurality of balls (205) are arranged in the ball slide groove (204), and a third rotating shaft (206) rotatably arranged on the axis of the bearing inner ring (203) is fixed at the bottom of the mounting plate (2).

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