Trundle convenient to replace

Abstract

The utility model relates to the technical field of trundles, in particular to a trundle convenient for replacing wheels, which comprises a cross beam, a support and two wheels, the support is fixedly welded on the front side surface of the cross beam, the two wheels are distributed at two ends of the cross beam, two ends of the cross beam are respectively connected with a bearing, and the other end of each bearing is connected with a shaft rod. A threaded connector penetrating into a hub of the wheel is arranged at the outer end of the shaft rod, a locking mechanism is arranged between the threaded connector and the wheel and used for mounting and dismounting the wheel, a locking cavity connected with a connecting piece of matched equipment is formed in a support of the trundle, the locking cavity is composed of a sawtooth-shaped notch and a clamping ring, and therefore the locking cavity can be used for locking the trundle. The size of the locking cavity can be manually adjusted at any time through the adjusting mechanism, the structure on the support does not need to be dismantled, meanwhile, additional bolts and tools such as a screwdriver do not need to be additionally arranged for operation, and convenience is higher when the trundle and matched equipment are installed and dismantled.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of caster, concretely to a caster convenient to replace wheel. BACKGROUND

[0002] Casters are often used in furniture, such as sofas, beds, dining tables and cabinets, to facilitate the movement, cleaning or layout adjustment of the home, and are also widely used in mobile auxiliary devices, such as suitcases, trolleys and walkers, to facilitate easy movement. A caster generally consists of a bracket and a wheel mounted on the bracket. When the caster is installed on a device such as a trolley for use, it needs to be fixed to the trolley plate using bolts. The assembly of the bracket and the wheel is usually fixed by multiple bolts. The bolts need to be screwed in with the help of a screwdriver or other tools. In actual life, the wheels of the caster wear out seriously after a long time, so they need to be replaced frequently. However, this bolt mounting method is not convenient for replacing the entire caster or a single wheel on the caster by hand, which brings inconvenience to actual use. SUMMARY

[0003] To achieve the above purpose, the utility model provides the following technical scheme: a caster convenient to replace wheel, including crossbeam, support and two wheels, the support is fixedly welded on the front side surface of crossbeam, two the wheels are distributed in the both ends of crossbeam, the both ends of crossbeam are connected with a bearing, the other end of bearing is connected with a shaft, the outer end of shaft is provided with the threaded joint that passes in the wheel hub, and the threaded joint is provided with locking mechanism between wheel, is used for the installation and dismounting of wheel;

[0004] The locking mechanism comprises a fastening nut screwed onto the threaded joint, and a movable ring is rotatably arranged on the outer surface of the fastening nut. A plurality of fixed short plates two are fixedly arranged on the outer surface of the movable ring. A second connecting rod is movably connected to each fixed short plate two.

[0005] The locking mechanism further comprises a plurality of fixed short plates one fixedly arranged around the outer surface of the threaded joint. A first connecting rod is movably connected to each fixed short plate one. The first connecting rod and the second connecting rod are movably connected by a pin shaft.

[0006] The support is integrally welded with a trapezoidal plate perpendicular thereto at both upper and lower ends. A recess is formed in the front side edge of the trapezoidal plate. A clasp ring is movably mounted on the side surface of the support between the two trapezoidal plates. A locking cavity is formed between the clasp ring and the recess for connecting a device used in conjunction therewith.

[0007] As preferred, the side hub center position of the wheel is provided with an outer extension ring, and the end face of the outer extension ring is provided with a plurality of notches corresponding to the first connecting rod in number and position, and the width of the notches is greater than the sum of the thicknesses of the first connecting rod and the second connecting rod.

[0008] As preferred, the threaded joint penetrates one-third position of the outer extension ring, the diameter of the threaded joint is smaller than the diameter of the shaft, the outer diameter of the shaft is the same as the inner diameter of the outer extension ring and penetrates two-thirds position of the outer extension ring, and the outer diameter of the fastening nut is greater than the inner diameter of the outer extension ring.

[0009] As preferred, a plurality of the second fixed short plates are circularly arranged on the outer surface of the movable ring and are movably connected with the movable ring through a pin shaft, a plurality of the second fixed short plates are circularly arranged on the outer surface of the movable ring, and the number of the second fixed short plates is the same as that of the first connecting rods, and the second connecting rod is movably connected with the second fixed short plate through a pin shaft.

[0010] As preferred, the two clamping rings are parallel to each other and parallel to the two trapezoidal plates, respectively, and the notches are in a sawtooth structure to increase the friction with the connecting piece.

[0011] As preferred, the side surface of the support is provided with a through hole penetrating front and back, for allowing the clamping ring to horizontally penetrate the support, and the overlapping part of the support and the cross beam is provided with a through screw hole penetrating front and back, and the inside of the screw hole is fixedly provided with a screw rod through a bolt, and the screw rod is provided with an adjusting mechanism connected with the two clamping rings, respectively.

[0012] As preferred, the adjusting mechanism comprises a U-shaped frame, both ends of the U-shaped frame are fixedly connected with a same fixed frame, the two fixed frames are connected with the two clamping rings, respectively, and the outer surface of the U-shaped frame is further rotatably connected with a manual knob, and the manual knob is threadedly sleeved on the outer surface of the screw rod. Advantages

[0013] Compared with the prior art, the utility model provides a trolley wheel convenient to replace wheels, has the following advantages:

[0014] By setting the locking cavity connected with the connecting piece of the matched use equipment on the support of the trolley wheel, the locking cavity is composed of the sawtooth notch and the clamping ring, the size of the locking cavity can be manually adjusted at any time through the adjusting mechanism, without the need to disassemble the structure on the support, and without the need for additional bolts and the help of screwdrivers and other tools, so that the convenience of the trolley wheel and the matched equipment during installation and disassembly is higher.

[0015] The locking mechanism is arranged to fix the wheels at both ends of the cross beam, when installing the wheels, rotating the fastening nut to rotate on the threaded joint, the fastening nut drives the movable ring to push the plurality of second connecting rods and the first connecting rod to be clamped into the notch, at this time, the locking of the wheels at both ends of the cross beam is completed, when disassembling the wheels, only the fastening nut is unscrewed from the threaded joint, the effect of simple and quick replacement of the wheels is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and serve to explain the principles of the application, and do not limit the application. In the drawings:

[0017] Figure 1 It is a schematic diagram of the overall structure of the caster of the utility model;

[0018] Figure 2 It is a split view of the bracket and the wheel of the utility model caster;

[0019] Figure 3 It is a split view of the fastening nut and the threaded joint of the utility model;

[0020] Figure 4 It is a schematic diagram of the utility model Figure 3 from the symmetry perspective;

[0021] Figure 5 It is a structure diagram of the wheel of the utility model;

[0022] Figure 6 It is a top view of the utility model Figure 1 ;

[0023] Figure 7 It is a split view of the cross beam and the screw rod of the utility model;

[0024] Figure 8 It is a schematic diagram of the cross beam and the bracket connection structure of the utility model;

[0025] Figure 9 It is an enlarged view of area a in the utility model Figure 2 ;

[0026] Explanation of reference signs:

[0027] 1, cross beam; 11, bearing; 12, shaft rod; 121, threaded joint; 122, fixed short plate one; 123, first connecting rod; 13, threaded hole; 14, screw rod;

[0028] 2, bracket; 21, trapezoidal plate; 211, notch; 212, clamping ring; 22, perforated hole;

[0029] 3, wheel; 31, outer extension ring; 32, notch;

[0030] 4, U-shaped frame; 41, fixed frame; 42, manual knob;

[0031] 5, fastening nut; 51, movable ring; 52, second fixed short plate; 53, second connecting rod. DETAILED DESCRIPTION

[0032] The embodiments of the present application will be described in detail with the accompanying drawings and examples, so that the realization process of how to apply technical means to solve technical problems and achieve technical effects of the present application can be fully understood and implemented.

[0033] As Figures 1-9 shown, it is an embodiment of the present application, in order to achieve the above object, the present application provides the following technical scheme: a caster with wheels convenient to replace, comprising a cross beam 1, a support 2 and two wheels 3, the support 2 is fixedly welded on the front side surface of the cross beam 1, the two wheels 3 are distributed at both ends of the cross beam 1, both ends of the cross beam 1 are connected with a bearing 11, the other end of the bearing 11 is connected with a shaft 12, the outer end of the shaft 12 is provided with a threaded joint 121 penetrating into the hub of the wheel 3, a locking mechanism is arranged between the threaded joint 121 and the wheel 3, which is used for mounting and dismounting the wheel 3;

[0034] Further, as Figure 3 and Figure 4 shown, the locking mechanism comprises a fastening nut 5 screwed on the threaded joint 121, the outer surface of the fastening nut 5 is rotatably provided with a movable ring 51, the outer surface of the movable ring 51 is fixedly provided with a plurality of second fixed short plates 52, each second fixed short plate 52 is movably connected with a second connecting rod 53, the locking mechanism further comprises a plurality of first fixed short plates 122 fixedly arranged around the outer surface of the threaded joint 121, each first fixed short plate 122 is movably connected with a first connecting rod 123, the first connecting rod 123 and the second connecting rod 53 are movably connected through a pin shaft, the fastening nut 5 is located on the outer side of the wheel 3, as Figure 9 shown, when the fastening nut 5 is rotated to rotate on the threaded joint 121, the movable ring 51 is driven to move synchronously towards the direction of the wheel 3, at this time the movable ring 51 pushes the second connecting rod 53 to make the position of the connection between the second connecting rod 53 and the first connecting rod 123 move, until the first connecting rod 123 and a part of the second fixed short plate 52 are clamped into the notch 32, at this time the locking of the wheel 3 at both ends of the cross beam 1 is completed, when dismounting the wheel 3, only need to unscrew the fastening nut 5 from the threaded joint 121;

[0035] Further, as Figure 5As shown, the hub center of one side of the wheel 3 is provided with an outer extension ring 31, and the end face of the outer extension ring 31 is provided with a plurality of notches 32 corresponding to the number of the first connecting rods 123, the width of the notches 32 is greater than the sum of the thickness of the first connecting rod 123 and the second connecting rod 53, and when the first connecting rod 123 and the second connecting rod 53 are connected, they can be clamped into the notches 32, the threaded joint 121 is movably penetrated through one-third of the position of the outer extension ring 31, the diameter of the threaded joint 121 is smaller than the diameter of the shaft 12, the outer diameter of the shaft 12 is the same as the inner diameter of the outer extension ring 31 and penetrates through two-thirds of the position of the outer extension ring 31, the outer diameter of the fastening nut 5 is greater than the inner diameter of the outer extension ring 31, a plurality of fixed short plates two 52 are circularly arranged on the outer surface of the movable ring 51, and the fixed short plate two 52 and the movable ring 51 are movably connected through a pin shaft, a plurality of fixed short plates two 52 are circularly arranged on the outer surface of the movable ring 51, and the number of the fixed short plate two 52 is the same as the number of the first connecting rod 123, the second connecting rod 53 and the fixed short plate two 52 are movably connected through a pin shaft, wherein the fastening nut 5 and the movable ring 51 are rotatably connected in a clamping manner, so that the movable ring 51 does not rotate with the fastening nut 5, and the fastening nut 5 can be separated from the movable ring 51 at any time, when the fastening nut 5 is removed from the threaded joint 121, the movable ring 51 is not pushed by the fastening nut 5, at this time, the movable ring 51 can drive the plurality of second connecting rods 53 on its outer surface to move on the threaded joint 121, so that the second connecting rod 53 and the first connecting rod 123 are moved out of the notches 32, and then the wheel 3 is removed from the threaded joint 121, thereby facilitating the installation and disassembly of the wheel 3.

[0036] In the second embodiment, as shown in Figures 6-8 The upper and lower ends of the bracket 2 are integrally welded with two vertical trapezoidal plates 21, the front edge of the trapezoidal plate 21 is provided with a notch 211, and the side of the bracket 2 is movably provided with two clamping rings 212 between the two trapezoidal plates 21, each clamping ring 212 and the corresponding notch 211 form a locking cavity for connecting the equipment matched therewith,

[0037] As shown in Figure 6 The two clamping rings 212 are parallel and vertically arranged with the two trapezoidal plates 21, and the notch 211 has a sawtooth structure, which can increase the friction with the connecting member when connected, so as to enhance the connection strength and prevent easy falling off;

[0038] Further, as shown in Figure 2 The side of the bracket 2 is provided with a through hole 22 penetrating through the front and back, for allowing the clamping ring 212 to horizontally penetrate through the bracket 2, and Figure 7As shown, the overlapping part of the bracket 2 and the beam 1 is provided with a through-thread hole 13, the inside of the thread hole 13 is fixedly installed with a screw rod 14 through a bolt, the screw rod 14 is provided with an adjusting mechanism connected with the two clamping rings 212 respectively, the adjusting mechanism is used for adjusting the cavity size of the locking cavity composed of the two clamping rings 212 and the notches 211, so as to be suitable for being installed on the connecting piece of the equipment of different specifications matched with it, and the practicability of the caster is improved;

[0039] As shown, Figure 2 The adjusting mechanism includes a U-shaped frame 4, both ends of the U-shaped frame 4 are fixedly connected with a same fixing frame 41, the two fixing frames 41 are connected with the two clamping rings 212 respectively, the outer surface of the U-shaped frame 4 is further rotatably connected with a hand knob 42, the hand knob 42 is threadedly sleeved on the outer surface of the screw rod 14, when the hand knob 42 is rotated, the hand knob 42 drives the two clamping rings 212 to move forward and backward through the U-shaped frame 4 and the fixing frame 41, so as to achieve the effect of adjusting the size of the locking cavity formed between the two clamping rings 212 and the two notches 211, and the adjusting process makes the two locking cavities change consistently, so that the uniform connection between the equipment connecting piece and the caster can be ensured to be uniform.

[0040] The two ends of each fixing frame 41 are a sandwich structure, the sandwich structure includes through holes opened on the front and back two plate surfaces of the fixing frame 41, and a nut located between the through holes, the two through holes are used for penetrating the clamping ring 212, and the nut is threadedly connected with the threaded part on the clamping ring 212, so as to fix the clamping ring 212 on the fixing frame 41, so that the clamping ring 212 can be displaced synchronously with the movement of the fixing frame 41, therefore, when the caster is installed on the connecting piece of the equipment, the size of the locking cavity formed between the two clamping rings 212 and the two notches 211 can be adjusted by rotating the hand knob 42, without the need to disassemble the clamping ring 212, so that the convenience is higher.

[0041] When the caster is installed and disassembled, the hand knob 42 drives the two clamping rings 212 to move forward and backward through the U-shaped frame 4 and the fixing frame 41, so as to achieve the effect of adjusting the size of the locking cavity formed between the two clamping rings 212 and the two notches 211, so as to be suitable for being installed on the connecting piece of the equipment of different specifications matched with it, without the need to disassemble the clamping ring 212, so that the convenience is higher.

[0042] When the wheel 3 is installed and removed, the fastening nut 5 is rotated to rotate on the threaded joint 121, and the movable ring 51 is driven to move synchronously to the direction of the wheel 3, at this time, the movable ring 51 pushes the second connecting rod 53 to make the position of the connection between the second connecting rod 53 and the first connecting rod 123 move, until the first connecting rod 123 and a part of the fixed short plate two 52 are clamped into the notch 32, at this time, the locking of the wheel 3 at both ends of the cross beam 1 is completed, and when the wheel 3 is removed, the fastening nut 5 is only needed to be screwed off from the threaded joint 121.

[0043] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A caster with easily replaceable wheels, comprising a crossbeam (1), a bracket (2), and two wheels (3), wherein the bracket (2) is fixedly welded to the front surface of the crossbeam (1), and the two wheels (3) are distributed at both ends of the crossbeam (1), characterized in that: Both ends of the crossbeam (1) are connected to a bearing (11), and the other end of the bearing (11) is connected to a shaft (12). The outer end of the shaft (12) is provided with a threaded joint (121) that penetrates into the hub of the wheel (3). A locking mechanism is provided between the threaded joint (121) and the wheel (3) for installing and removing the wheel (3). The locking mechanism includes a fastening nut (5) threaded onto a threaded connector (121). A movable ring (51) is rotatably provided on the outer surface of the fastening nut (5). Multiple fixed short plates (52) are fixedly provided on the outer surface of the movable ring (51). A second connecting rod (53) is movably connected to each fixed short plate (52). The locking mechanism also includes a plurality of fixed short plates (122) fixedly disposed around the outer surface of the threaded joint (121). Each fixed short plate (122) is movably connected to a first connecting rod (123), and the first connecting rod (123) and the second connecting rod (53) are movably connected by a pin. Both ends of the bracket (2) are integrally welded with trapezoidal plates (21) perpendicular to them. A notch (211) is opened on the front edge of the trapezoidal plate (21). Two retaining rings (212) located between the two trapezoidal plates (21) are movably installed on the side of the bracket (2). A locking cavity is formed between the retaining rings (212) and the notch (211) for connecting the equipment used with it.

2. The caster with convenient wheel replacement according to claim 1, characterized in that: An outer extension ring (31) is provided at the center of the hub on one side of the wheel (3). The end face of the outer extension ring (31) has multiple notches (32) that are the same number and position as the first connecting rod (123). The width of the notches (32) is greater than the sum of the thicknesses of the first connecting rod (123) and the second connecting rod (53).

3. A caster for easy wheel replacement according to claim 1, characterized in that: The threaded connector (121) extends through one-third of the outer extension ring (31). The diameter of the threaded connector (121) is smaller than the diameter of the shaft (12). The outer diameter of the shaft (12) is the same as the inner diameter of the outer extension ring (31) and extends through two-thirds of the outer extension ring (31). The outer diameter of the fastening nut (5) is larger than the inner diameter of the outer extension ring (31).

4. A caster for easy wheel replacement according to claim 1, characterized in that: Multiple fixed short plates (52) are arranged in a circular array on the outer surface of the movable ring (51), and the fixed short plates (52) and the movable ring (51) are movably connected by a pin. The number of fixed short plates (52) is the same as the number of the first connecting rod (123), and the second connecting rod (53) is movably connected to the fixed short plates (52) by a pin.

5. A caster for easy wheel replacement according to claim 1, characterized in that: The two retaining rings (212) are parallel to each other vertically and to the two trapezoidal plates (21) vertically respectively. The notch (211) has a sawtooth structure to increase the friction with the connector.

6. A caster for easy wheel replacement according to claim 1, characterized in that: The side of the bracket (2) is provided with a through hole (22) that runs from front to back, so that the retaining ring (212) passes through the bracket (2) horizontally. The overlapping part of the bracket (2) and the crossbeam (1) is provided with a threaded hole (13) that runs from front to back. A screw (14) is fixedly installed inside the threaded hole (13) by bolts. An adjustment mechanism is provided on the screw (14) that is connected to the two retaining rings (212) respectively.

7. A caster for easy wheel replacement according to claim 6, characterized in that: The adjustment mechanism includes a U-shaped frame (4), with a fixed frame (41) fixedly connected to both ends of the U-shaped frame (4). The two fixed frames (41) are respectively connected to two retaining rings (212). A manual knob (42) is also rotatably connected to the outer surface of the U-shaped frame (4). The manual knob (42) is threaded onto the outer surface of the screw (14).

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