Novel trundle

Abstract

The utility model provides a novel trundle. The novel trundle comprises a fixed seat, a roller unit, a rotating unit and a locking unit, the roller unit comprises a roller seat and a roller piece arranged on the roller seat; the locking unit comprises a positioning clamping groove formed in the fixed seat, an elastic pressing plate rotationally connected to the roller seat, and a connecting group for connecting the elastic pressing plate to the fixed seat; the connecting set comprises a brake pull wire and a compression spring, and the compression spring elastically presses the elastic pressing plate to be away from the fixing base. The elastic pressing plate is elastically pressed by the compression spring to be away from the fixed seat, and the roller seat can steer relative to the fixed seat; when the brake stay wire is drawn upwards, the elastic pressing plate takes the rotating part as a fulcrum, so that the positioning part is clamped with the positioning clamping groove, and the roller seat can be oriented relative to the fixed seat; and after the brake stay wire is continuously tensioned to a preset value, the stopping edge piece at the front end of the elastic pressing plate is in friction contact with the rolling wheel piece, the rolling wheel piece cannot roll, and therefore switching among the movable state, the directional state and the brake state of the novel trundle is completed.

Description

Technical Field

[0001] The utility model relates to the technical field of caster structures, and more specifically, to a new type of caster. Background Art

[0002] For the convenience of movement, casters are installed at the bottom of some furniture, medical devices, transport carts or seats for pushing. Casters are mainly divided into fixed-direction casters and swivel casters. Fixed-direction casters have strong load-bearing capacity but cannot turn casually, while swivel casters are more flexible in turning.

[0003] The Chinese patent application document with the publication number CN104589916A discloses a speed-controllable swivel caster, which includes a connection head. The connection head is rotatably connected to a connection body. A roller is provided on the connection body. A pressing piece is movably provided on the connection body. A protrusion is provided at the bottom of the pressing piece. A gasket is also provided on the connection body. The protrusion contacts the gasket to control the speed of the roller. A layer of anti-slip rubber is provided on the outer surface of the roller, and the gasket is made of wear-resistant rubber.

[0004] However, in the actual application process, casters need to switch among three states: moving, fixed-direction, and braking in different usage situations to achieve the effect of stable movement. Therefore, there is an urgent need for a caster structure to cope with different usage situations. Summary of the Utility Model

[0005] Based on this, in order to solve the problem that the existing casters cannot switch among the three states of moving, fixed-direction, and braking during use, the utility model provides a new type of caster, and its specific technical solution is as follows:

[0006] A new type of caster includes a fixed seat, a roller unit, a rotating unit, and a locking unit; the roller unit includes a roller seat and a roller member provided on the roller seat; the rotating unit is used to rotatably connect the fixed seat and the roller seat; the locking unit includes a positioning slot provided on the fixed seat, a spring pressing plate rotatably connected to the roller seat, and a connection group connecting the spring pressing plate to the fixed seat. The spring pressing plate is provided with a rotating part rotatably connected to the fixed seat, a positioning part adapted to the positioning slot, and a connecting part connected to the fixed seat; the spring pressing plate further includes a stop edge piece provided at the front end of the roller seat; the connection group includes a brake wire connected to the fixed seat and a compression spring sleeved on the brake wire, and the compression spring elastically presses the spring pressing plate away from the fixed seat.

[0007] For the above-mentioned new caster, when the compression spring compresses to spring the spring pressing plate away from the fixed seat, the roller seat can rotate relative to the fixed seat at this time; when the brake cable is pulled upward to make the spring pressing plate pivot around the rotating part and the positioning part snap into the positioning slot, the roller seat can be oriented relative to the fixed seat; after the positioning part snaps into the positioning slot and the brake cable is continuously tightened to a preset value, the stop edge piece at the front end of the spring pressing plate makes frictional contact with the roller part, the roller part cannot roll, and the roller seat cannot rotate relative to the fixed seat, thus completing the switching of the new caster between the movable state, the oriented state and the braking state.

[0008] Further, the positioning part includes a first positioning position arranged at the end of the spring pressing plate; the fixed seat includes a fixing plate and a mounting circular seat arranged below the fixing plate; the positioning slot includes a first positioning slot arranged on the mounting circular seat, and the first positioning slot is a positioning slot adapted to the length direction of the fixing plate.

[0009] Further, the rotating unit includes a lower bearing tile arranged on the fixed seat, and the positioning slot further includes a plurality of convex tooth grooves arranged on the circumferential lower edge of the lower bearing tile; the positioning part is a second positioning position arranged in the middle of the spring pressing plate, and the second positioning position is adapted to the convex tooth grooves.

[0010] Further, the rotating unit further includes an upper bearing tile, a rotating arc plate arranged on the roller seat, a first ball ring and a second ball ring; the first ball ring is arranged between the upper bearing tile and the rotating arc plate, and the second ball ring is arranged between the rotating arc plate and the lower bearing tile and the rotating arc plate.

[0011] Further, the ball diameter of the first ball ring is larger than the ball diameter of the second ball ring.

[0012] Further, the roller unit further includes a connecting piece arranged at the front end of the roller seat and a rotating pin arranged in the middle of the roller seat; the rotating part includes a bending buckle arranged at the front end of the spring pressing plate, an arc groove arranged in the middle of the spring pressing plate, and a pressing piece for pressing the roller seat; the bending buckle buckles on the connecting piece, and the arc groove is adapted to the rotating pin.

[0013] Further, the connecting piece is a V-shaped plate; the roller seat is provided with a clearance groove; the bending buckle buckles on the bottom of the V-shaped plate; the right upper end of the V-shaped plate passes through the clearance groove and is connected to the roller seat, and the left upper end extends out of the roller seat.

[0014] Further, the fixed seat includes a seat body and a cylindrical part arranged on the seat body; the upper bearing tile and the lower bearing tile are connected to the outer cylindrical wall of the cylindrical part; the compression spring is arranged in the circular cavity of the cylindrical part.

[0015] Further, the second fixed position is a toothed flange provided between the arc groove and the force-receiving flange. Description of the Drawings

[0016] The present utility model can be further understood from the following description in conjunction with the drawings. The components in the drawings are not necessarily drawn to scale, but the emphasis is on showing the principles of the embodiments. In different views, the same reference numerals designate corresponding parts.

[0017] Figure 1 is a schematic structural view of a novel caster according to an embodiment of the present utility model;

[0018] Figure 2 is a cross-sectional structural view of a novel caster according to an embodiment of the present utility model;

[0019] Figure 3 is a partial schematic structural view of a novel caster according to an embodiment of the present utility model;

[0020] Figure 4 is a schematic structural view of an elastic pressing plate according to an embodiment of the present utility model.

[0021] Description of Reference Numerals:

[0022] 1, fixed seat; 2, roller unit; 3, rotating unit; 4, locking unit;

[0023] 11, fixing plate; 12, mounting round seat; 13, cylindrical member;

[0024] 21, roller seat; 22, connecting piece; 23, rotating pin; 24, roller member;

[0025] 31, upper bearing tile; 32, lower bearing tile; 33, rotating arc plate; 34, first ball ring; 35, second ball ring;

[0026] 41, positioning slot; 42, elastic pressing plate; 43, connecting group;

[0027] 421, rotating part; 422, positioning part; 423, connecting part; 424, bending buckle; 425, arc groove; 426, pressing piece; 427, stopping edge piece; 428, force-receiving flange; 429, toothed flange;

[0028] 431, brake cable; 432, compression spring. Detailed Embodiments

[0029] In order to make the purpose, technical solution and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below in conjunction with its embodiments. It should be understood that the specific implementation manners described herein are only used to explain the present utility model and do not limit the protection scope of the present utility model.

[0030] It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation manner.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the description of the present utility model herein are only for the purpose of describing specific implementation manners and are not intended to limit the present utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0032] In the present utility model, the so-called "first" and "second" do not represent specific quantities and orders, but are only used for name distinction.

[0033] As Figure 1 and Figure 2 shown, a new type of caster in an embodiment of the present utility model includes a fixed seat 1, a roller unit 2, a rotating unit 3, and a locking unit 4; the roller unit 2 includes a roller seat 21 and a roller member 24 provided on the roller seat 21; the rotating unit 3 is used for rotatably connecting the fixed seat 1 and the roller seat 21; the locking unit 4 includes a positioning slot 41 provided on the fixed seat 1, a spring pressing plate 42 rotatably connected to the roller seat 21, and a connecting group 43 connecting the spring pressing plate 42 to the fixed seat 1. The spring pressing plate 42 is provided with a rotating portion 421 rotatably connected to the fixed seat 1, a positioning portion 422 adapted to the positioning slot 41, and a connecting portion 423 connected to the fixed seat 1; the spring pressing plate 42 further includes a stopping edge piece 427 provided at the front end of the roller seat 21; the connecting group 43 includes a brake cable 431 connected to the fixed seat 1 and a compression spring 432 sleeved on the brake cable 431, and the compression spring 432 elastically presses the spring pressing plate 42 away from the fixed seat 1.

[0034] The above-mentioned new caster can push the spring plate 42 away from the fixed seat 1 by compressing the spring 432. At this time, the roller seat 21 can rotate relative to the fixed seat 1; when the brake cable 431 is pulled upward, the spring plate 42 takes the rotating part 421 as a fulcrum, and the positioning part 422 is clamped into the positioning slot 41, so that the roller seat 21 can be oriented relative to the fixed seat 1; after the positioning part 422 is clamped into the positioning slot 41 and the brake cable 431 is continuously tightened to a preset value, the stop edge piece 427 at the front end of the spring plate 42 is in frictional contact with the roller part 24, the roller part 24 cannot roll, and the roller seat 21 cannot rotate relative to the fixed seat 1. Therefore, the switching between the active state, the oriented state and the braking state of the new caster is completed.

[0035] In one embodiment, the positioning part 422 includes a first positioning position arranged at the end of the spring plate 42; the fixed seat 1 includes a fixing plate 11 and a mounting circular seat 12 arranged below the fixing plate 11; the positioning slot 41 includes a first positioning slot arranged on the mounting circular seat 12, and the first positioning slot is a positioning slot adapted to the length direction of the fixing plate 11. In this way, by adjusting the tightening degree of the brake cable 431, the switching between the oriented state and the braking state of the new caster can be realized; when the brake cable 431 is tightened to the first preset value, the first positioning position at the end of the spring plate 42 is clamped into the positioning slot, so that the roller seat 21 can be oriented relative to the fixed seat 1; when the brake cable 431 is tightened to the second preset value, the spring plate 42 is deformed under pressure, and the stop edge piece 427 at the front end of the spring plate 42 is in frictional contact with the roller part 24, and the roller part 24 cannot roll.

[0036] In one implementation manner, the first positioning slot is a plurality of positioning slots adapted to the length direction of the fixing plate 11, and are respectively arranged in the directions parallel and perpendicular to the length direction of the fixing plate 11. In this way, the roller seat 21 can be oriented relative to the fixed seat 1 at angles such as 0°, 90°, 180°, 270°, etc.

[0037] In one embodiment, the rotating unit 3 includes a lower bearing tile 32 arranged on the fixed seat 1, and the positioning slot 41 further includes a plurality of convex tooth grooves arranged at intervals along the lower edge of the circumference of the lower bearing tile 32; the positioning part 422 is a second positioning position arranged in the middle of the spring plate 42, and the second positioning position is adapted to the convex tooth grooves. In this way, when the first positioning position and the positioning slot are not at the preset clamping angle, after the brake cable 431 is tightened to the preset value, the second positioning position is clamped into the convex tooth grooves to realize multi-angle or arbitrary-angle oriented braking.

[0038] In a specific implementation manner, the new caster can have multiple states:

[0039] In the active state, the compression spring 432 elastically presses the spring pressing plate 42 away from the fixed seat 1, and the first fixed positioning position is not in contact with the positioning groove;

[0040] In the oriented state, the brake cable 431 is tightened to the first preset value, the compression spring 432 is compressed and shortened, the spring pressing plate 42 approaches the fixed seat 1, the first fixed positioning position is engaged with the positioning groove, and the roller seat 21 is oriented relative to the fixed seat 1;

[0041] In the braking state, after the brake cable 431 is tightened to the preset value, the second fixed positioning position is engaged with the convex tooth groove, the stop edge piece 427 at the front end of the spring pressing plate 42 is in frictional contact with the roller member 24, the roller member 24 cannot roll, and the roller seat 21 cannot rotate relative to the fixed seat 1, realizing multi-angle or arbitrary-angle oriented braking.

[0042] In one embodiment, the rotating unit 3 further includes an upper bearing tile 31, a rotating arc plate 33 provided on the roller seat 21, a first ball ring 34, and a second ball ring 35; the first ball ring 34 is provided between the upper bearing tile 31 and the rotating arc plate 33, and the second ball ring 35 is provided between the rotating arc plate 33 and the lower bearing tile 32 and the rotating arc plate 33. Thus, a structure for supporting rotation is formed by the cooperation of the first ball ring 34 and the second ball ring 35 with the rotating arc plate 33, with high rotation stability, low friction, which is beneficial to increasing the load-bearing capacity, making the steering smoother and improving the service life.

[0043] In one embodiment, the ball diameter of the first ball ring 34 is larger than the ball diameter of the second ball ring 35. Thus, since the balls of the first ball ring 34 are mainly pressed and rotated on the rotating arc plate 33, the larger the ball diameter, the better the supporting rotation effect.

[0044] In one embodiment, the roller unit 2 further includes a connecting piece 22 provided at the front end of the roller seat 21, and a rotating pin 23 provided in the middle of the roller seat 21; the rotating portion 421 includes a bending buckle 424 provided at the front end of the spring pressing plate 42, an arc groove 425 provided in the middle of the spring pressing plate 42, and a pressing piece 426 for pressing the roller seat 21; the bending buckle 424 buckles on the connecting piece 22, and the arc groove 425 is adapted to the rotating pin 23.

[0045] In one embodiment, the connecting piece 22 is a V-shaped plate; the roller seat 21 is provided with a clearance groove; the bending buckle 424 is buckled on the bottom of the V-shaped plate; the upper right end of the V-shaped plate passes through the clearance groove and is connected to the roller seat 21, and the upper left end extends out of the roller seat 21. In this way, by pressing the upper left end of the V-shaped plate that extends out of the roller seat 21, the stop edge piece 427 is brought into frictional contact with the roller member 24, thereby achieving the effect of stopping the roller member 24.

[0046] In one embodiment, the fixed seat 1 includes a cylindrical member 13 provided on the fixing plate 11; the upper bearing tile 31 and the lower bearing tile 32 are connected to the outer cylindrical wall of the cylindrical member 13; the compression spring 432 is disposed in the circular cavity of the cylindrical member 13.

[0047] In one implementation manner, the upper bearing tile 31, the lower bearing tile 32, and the mounting circular seat 12 are sequentially sleeved on the cylindrical member 13.

[0048] In one embodiment, the second fixed position is a toothed flange 429 provided between the arc groove 425 and the force-receiving flange 428. In this way, by pressing the connecting piece 22, the elastic pressing plate 42 forms a lever with the rotating pin 23 as the fulcrum, and the force-receiving flange 428 is pressed against the limiting groove, thereby ensuring that the toothed flange 429 is better engaged with the positioning card slot 41 on the fixed seat 1.

[0049] In one embodiment, the fixing plate 11 is provided with a hollow hole, and the brake cable 431 passes through the hollow hole; the new caster further includes a pumping unit; the pumping unit is used to pump the brake cable 431, so that the wire end of the brake cable 431 presses against the elastic pressing plate 42, and the compression spring 432 is compressed, thereby causing the elastic pressing plate 42 to form a lever with the rotating pin 23 as the fulcrum, thereby controlling the engagement of the first fixed position with the positioning groove, or the engagement of the second fixed position with the convex tooth groove, and the frictional contact between the stop edge piece 427 and the roller member 24, realizing the switching of multiple states of the new caster.

[0050] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0051] The above-described embodiments merely represent several implementation manners of the present utility model. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all fall within the protection scope of the present utility model. Therefore, the protection scope of the present utility model patent shall be subject to the appended claims.

Claims

1. A new type of caster, characterized in that, It includes a fixed seat, a roller unit, a rotating unit, and a locking unit; The roller unit includes a roller seat and a roller member provided on the roller seat; The rotating unit is used for rotatably connecting the fixed seat and the roller seat; The locking unit includes a positioning slot provided on the fixed seat, a spring pressing plate rotatably connected to the roller seat, and a connecting group connecting the spring pressing plate to the fixed seat. The spring pressing plate is provided with a rotating portion rotatably connected to the fixed seat, a positioning portion adapted to the positioning slot, and a connecting portion connected to the fixed seat; The spring pressing plate further includes a stop edge piece provided at the front end of the roller seat; The connecting group includes a brake cable connected to the fixed seat and a compression spring sleeved on the brake cable. The compression spring elastically presses the spring pressing plate away from the fixed seat.

2. The novel caster according to claim 1, wherein, The positioning portion includes a first positioning position provided at the end of the spring pressing plate; The fixed seat includes a fixing plate and a mounting round seat provided below the fixing plate; The positioning slot includes a first positioning slot provided on the mounting round seat. The first positioning slot is a positioning groove adapted to the length direction of the fixing plate.

3. A novel caster according to claim 2, characterized in that, The rotating unit includes a lower bearing tile provided on the fixed seat. The positioning slot further includes a plurality of convex tooth grooves provided on the circumferential lower edge of the lower bearing tile; The positioning portion is a second positioning position provided in the middle of the spring pressing plate. The second positioning position is adapted to the convex tooth grooves; 4. A novel caster according to claim 3, characterized in that, The rotating unit further includes an upper bearing tile, a rotating arc plate provided on the roller seat, a first ball ring and a second ball ring; The first ball ring is provided between the upper bearing tile and the rotating arc plate, and the second ball ring is provided between the rotating arc plate and the lower bearing tile and the rotating arc plate; 5. A novel caster according to claim 4, characterized in that, The ball diameter of the first ball ring is larger than the ball diameter of the second ball ring; 6. The novel caster according to claim 3, characterized in that, The roller unit further includes a connecting piece provided at the front end of the roller seat and a rotating pin provided in the middle of the roller seat; The rotating portion includes a bending buckle provided at the front end of the spring pressing plate, an arc groove provided in the middle of the spring pressing plate, and a pressing piece for pressing the roller seat; The bending buckle clamps the connecting piece, and the arc groove is adapted to the rotating pin; 7. A novel caster according to claim 6, characterized in that, The connecting piece is a V-shaped plate; The roller seat is provided with a clearance groove; The bending buckle clamps the bottom of the V-shaped plate; The upper right end of the V-shaped plate passes through the clearance groove and is connected to the roller seat, and the upper left end extends out of the roller seat; 8. A novel caster according to claim 4, wherein, The fixed seat includes a seat body and a cylindrical member provided on the seat body; The upper bearing tile and the lower bearing tile are connected to the outer cylinder wall of the cylindrical member; The compression spring is provided in the circular cavity of the cylindrical member; 9. A novel caster according to claim 6, characterized in that, The second positioning position is a tooth-shaped flange provided between the arc groove and the force-bearing edge.

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