CN219769535U - Universal wheel with adjustable braking mode - Google Patents

Abstract

The universal wheel with the adjustable braking mode comprises an outer pipe and an inner pipe arranged in the outer pipe, wherein the lower end of the inner pipe penetrates out of the outer pipe downwards, through holes communicated with the inner space of the outer pipe are formed in the outer walls on the front side and the rear side of the upper end of the outer pipe, a cam matched with the outer pipe is arranged in the upper end of the outer pipe, an adjusting hole coaxial with the through holes is formed in the center of the cam, the adjusting hole is in a regular hexagon shape, and a tubular connector is arranged at the lower end of the inner pipe; the outer diameter of the connector is smaller than the outer diameter of the inner tube; the connector is sleeved with a main bearing attached to the lower end face of the inner tube; the outer wall of the lower end of the connector is outwards extended to form a limit flanging which is attached to the lower surface of the main bearing; the connector is connected with a rotating cover through a main bearing. The universal wheel with the adjustable braking mode can limit the rolling of the universal wheel, can limit the horizontal rotation of the universal wheel, achieves the double braking effect, and ensures the stability of the equipment in a standing state to the greatest extent.

Description

Universal wheel with adjustable braking mode

Technical Field

The utility model relates to a universal wheel, in particular to a universal wheel with an adjustable braking mode.

Background

The universal wheel is actually a movable castor, the support of the universal wheel can rotate horizontally by 360 degrees in dynamic load or static load, meanwhile, the wheel sheet of the universal wheel can roll by utilizing a bearing, the universal wheel is only required to be installed on the lower surface of the machine body of the equipment, flexible movement of the equipment can be easily realized, the traditional universal wheel is generally provided with a braking structure, but the braking structure utilizes friction force to realize standing of the wheel sheet of the universal wheel, so that the wheel sheet which can roll originally can stop rolling by utilizing the bearing, the braking mode is only used for limiting the wheel sheet of the universal wheel, the support of the universal wheel can rotate by 360 degrees, although the support of the universal wheel is required to bear gravity from the equipment after the wheel sheet cannot roll, the universal wheel is fixed at one position by the gravity of the equipment, and once the external force is applied to the equipment, the support can rotate by a certain angle, so that the equipment is rocked, and the stability of the equipment when the equipment is kept stand is affected.

Disclosure of Invention

The utility model aims to solve the technical problem of providing the universal wheel with the adjustable braking mode, which not only can limit the rolling of the universal wheel, but also can limit the horizontal rotation of the universal wheel, thereby realizing the double braking effect and ensuring the stability of the equipment in a standing way to the greatest extent.

The technical scheme adopted for solving the technical problems is as follows:

the utility model discloses a universal wheel capable of adjusting a braking mode, which comprises an outer tube and an inner tube arranged in the outer tube, wherein the lower end of the inner tube penetrates out of the outer tube downwards, through holes communicated with the inner space of the outer tube are formed in the outer walls at the front side and the rear side of the upper end of the outer tube, a cam matched with the outer tube is arranged in the upper end of the outer tube, an adjusting hole coaxial with the through holes is formed in the center of the cam, the adjusting hole is in a regular hexagon shape, and a tubular connector is arranged at the lower end of the inner tube; the outer diameter of the connector is smaller than the outer diameter of the inner tube; the connector is sleeved with a main bearing attached to the lower end face of the inner tube; the outer wall of the lower end of the connector is outwards extended to form a limit flanging which is attached to the lower surface of the main bearing; the connector is connected with a rotating cover through a main bearing; the upper end of the rotating cover is externally provided with a connecting sleeve; the lower end of the connecting sleeve is provided with a shell covered outside the rotating cover; the lower surface of the shell is provided with a rolling opening communicated with the inner space of the shell; the rotary cover is positioned at the center of the left side of the inner space of the shell; a fixing piece is arranged in the upper part of the rotating cover; a brake piece matched with the fixing piece is arranged in the lower part of the rotating cover; the outer walls of the front side and the rear side of the rotating cover are provided with extending openings communicated with the inner space of the rotating cover; the left side and the right side of the brake piece are provided with mutually symmetrical brake structures, and the brake structures extend into the shell through the extending openings; a rolling structure matched with the braking structure is arranged in the right part of the shell; an adjusting structure matched with the cam is arranged in the inner tube; the adjustment structure includes a stop that mates with the mount.

The rolling structure comprises a front support and a rear support which are arranged in the center of the inner wall of the upper side of the right part of the shell, the front support is attached to the front side wall of the rear support, and the front support and the rear support form a support frame; the lower part of the supporting frame is provided with a supporting hole; a supporting tube matched with the supporting hole is arranged in the supporting hole; the front end of the support tube penetrates out of the support hole forwards, and the rear end of the support tube penetrates out of the support hole backwards; a front limiting pipe attached to the side wall of the front side of the support frame is sleeved outside the front part of the support tube; the rear part of the supporting tube is sleeved with a rear limiting tube which is attached to the side wall of the rear side of the supporting frame; the outer wall of the front end of the support tube is provided with a front limit part, and the outer wall of the rear end of the support tube is provided with a rear limit part; the support tube is sleeved with a previous bearing positioned between the side wall of the rear side of the front limiting part and the front end face of the front limiting tube; the support tube is sleeved with a rear bearing which is positioned between the side wall of the front side of the rear limiting part and the rear end face of the rear limiting tube; the front end of the supporting tube is connected with a front wheel through a previous bearing; the rear end of the supporting tube is connected with a rear wheel through a rear bearing; the positions of the front wheel and the rear wheel correspond to the positions of the brake structure.

The middle part of the side wall of the front side of the front wheel is provided with a front clamping step which is annular; the middle part of the side wall at the rear side of the rear wheel is provided with a rear clamping step which is annular; the front clamping step and the rear clamping step are respectively provided with a face cover matched with the front clamping step and the rear clamping step.

The brake structure comprises arc-shaped side wings, and the outer walls of the front side and the rear side of the brake piece are provided with the arc-shaped side wings; the arc-shaped side wings arranged on the outer wall of the front side of the brake piece are opposite to the front wheel, the arc-shaped side wings arranged on the outer wall of the rear side of the brake piece are opposite to the rear wheel, and a side wall of the front arc-shaped side wings opposite to the front wheel and a side wall of the rear arc-shaped side wings opposite to the rear wheel are provided with a plurality of brake teeth which are uniformly distributed.

The adjusting structure comprises an adjusting rod arranged in the inner pipe; the inner wall of the inner tube and the outer wall of the adjusting rod are all regular hexagons, and the inner wall of the inner tube is attached to the outer wall of the adjusting rod; the inner wall of the pipe orifice at the upper end of the inner pipe is provided with an annular limiting step; a screw joint is arranged in the center of the upper end face of the adjusting rod; an adjusting nut is screwed outside the upper end of the screw joint; a positioning head is arranged on the upper surface of the adjusting nut; an upper spring sleeved outside the screw joint is arranged between the lower surface of the adjusting nut and the limiting step; the lower surface of the stop piece is provided with a plurality of stop teeth which are uniformly distributed in the circumference.

The upper surface of the fixing piece is provided with a plurality of stop grooves corresponding to the stop teeth in position; the stop tooth is positioned right above the stop tooth; the center of the fixing piece is provided with a first through hole longitudinally penetrating through the fixing piece; the center of the brake piece is provided with a second through hole which longitudinally penetrates through the brake piece, and the second through hole is coaxial with the first through hole; a groove communicated with the second through hole is formed in the middle of the upper surface of the brake piece; the right groove wall of the groove is inclined rightwards, and the hole at the upper end of the second through hole is positioned on the right groove wall of the groove; the inner wall of the hole at the upper end of the second through hole is provided with an annular positioning step; the middle part of the lower surface of the fixing piece is provided with an embedded block matched with the groove, and the embedded block is in a right-angle triangular shape; a square slide bar is arranged on the right-angle surface on the left side of the embedded block, and a chute matched with the square slide bar is arranged on the left side wall of the groove; the lower inclined surface of the embedded block is provided with a clamping hole communicated with the first through hole, and the width of the clamping hole is larger than the diameter of the first through hole; the center of the lower surface of the stop piece is provided with a moving rod; the lower end of the moving rod sequentially passes through the first through hole, the clamping hole and the upper slot opening of the groove downwards and penetrates into the upper slot opening of the second through hole; a middle spring sleeved outside the movable rod is arranged between the bottom of the clamping hole and the positioning step; an annular step is arranged on the inner wall of the hole at the lower end of the second through hole; a lower spring is arranged between the annular step and the inner wall of the lower side of the rotating cover, and the upper part of the lower spring is positioned in the orifice of the lower end of the second through hole; the right side of the upper surface of the brake piece is provided with a guide hole, and the lower surface of the fixing piece is provided with a guide rod matched with the guide hole.

The upper end of the positioning head is arc-shaped; the lower surface of the cam is provided with an initial groove matched with the positioning head; the right lower corner of the cam surface is provided with an orientation groove adjacent to the initial groove; the upper side of the cam surface is provided with an arc-shaped universal groove, and the radian of the universal groove is 90 degrees; the upper end of the outer tube is provided with an upper cover matched with the outer tube; the inner wall of the upper side of the upper cover is provided with a top block positioned in the middle of the universal groove.

A dust cover is arranged outside the lower end of the outer tube; the dustproof cover covers the upper end of the rotating cover and the upper end of the connecting sleeve; the inner peripheral surface of the dust cover is provided with an inner conical surface with a narrow upper part and a wide lower part; the outer wall of the upper end of the connecting sleeve is provided with an outer conical surface with a narrow upper part and a wide lower part; and a dustproof gap is arranged between the inner conical surface and the outer conical surface.

The beneficial effects of the utility model are as follows:

compared with the prior art, the universal wheel with the adjustable braking mode has the advantages that the braking mode can be effectively changed by rotating the cam, when the front wheel and the rear wheel are required to be limited in an oriented manner, the front wheel and the rear wheel can be limited to rotate horizontally by 360 degrees only by rotating the cam clockwise, so that the front wheel and the rear wheel can only stably roll towards one direction and can not freely turn, stability of the equipment in the process of moving in one direction by utilizing the universal wheel is ensured, when the front wheel and the rear wheel are required to be limited in an oriented manner and are limited in a rolling manner, the front wheel and the rear wheel can be kept in place only by rotating the cam anticlockwise, and meanwhile, the horizontal rotation by 360 degrees can not be performed, the double braking effect is realized, the situation that the equipment is rocked due to the horizontal rotation of the universal wheel under the action of external force is avoided, the stability of the equipment in the standing process is ensured to the maximum extent, and the safety of the equipment is ensured.

Drawings

FIG. 1 is a cross-sectional view of an adjustable brake mode universal wheel of the present utility model;

fig. 2 is an enlarged view of a portion a of fig. 1;

FIG. 3 is a partial cross-sectional view of the present utility model with front and rear wheels disposed within the housing of the adjustable brake mode universal wheel;

FIG. 4 is a schematic view of the structure of the brake assembly with the retainer and the retainer;

FIG. 5 is a schematic structural view of a fastener;

FIG. 6 is a schematic view of an angle configuration of a brake member;

FIG. 7 is a schematic view of another angle of the brake member.

Detailed Description

The utility model is described in further detail below with reference to the attached drawings and detailed description:

referring to fig. 1 to 7, the utility model provides a universal wheel capable of adjusting a braking mode, which comprises an outer tube 1 and an inner tube 2 arranged in the outer tube 1, wherein the lower end of the inner tube 2 penetrates out of the outer tube 1 downwards, through holes 3 communicated with the inner space of the outer tube 1 are formed in the front outer wall and the rear outer wall of the upper end of the outer tube 1, a cam 4 matched with the outer tube is arranged in the upper end of the outer tube 1, an adjusting hole 5 coaxial with the through holes 3 is formed in the center of the cam 4, the adjusting hole 5 is in a regular hexagon shape, and a tubular connector 6 is arranged at the lower end of the inner tube 2; the outer diameter of the connector 6 is smaller than the outer diameter of the inner tube 2; the connector 6 is sleeved with a main bearing 7 which is attached to the lower end face of the inner tube 2; the outer wall of the lower end of the connector 6 is outwards extended to form a limit flanging 8 which is attached to the lower surface of the main bearing 7; the connector 6 is connected with a rotating cover 9 through a main bearing 7; a connecting sleeve 10 is arranged outside the upper end of the rotating cover 9; the lower end of the connecting sleeve 10 is provided with a shell 11 covered outside the rotating cover 9; the lower surface of the shell 11 is provided with a rolling opening 12 communicated with the inner space of the shell; the rotating cover 9 is positioned at the center of the left side of the inner space of the shell 11; a fixing piece 13 is arranged in the upper part of the rotating cover 9; a brake piece 14 matched with the fixing piece 13 is arranged in the lower part of the rotating cover 9; the outer walls of the front side and the rear side of the rotating cover 9 are provided with extending openings 15 communicated with the inner space of the rotating cover; the left side and the right side of the brake piece 14 are provided with mutually symmetrical brake structures, and the brake structures extend into the shell 11 through the extension openings 15; a rolling structure matched with the braking structure is arranged in the right part of the shell 11; an adjusting structure matched with the cam 4 is arranged in the inner tube 2; the adjustment structure comprises a stop 16 matching the fixing 13.

The rolling structure comprises a front support 1701 and a rear support 1702 which are arranged in the center of the inner wall of the upper side of the right part of the shell 11, the front support 1701 is attached to the front side wall of the rear support 1702, and the front support 1701 and the rear support 1702 form a support frame 17; the lower part of the supporting frame 17 is provided with a supporting hole 18; a supporting pipe 19 matched with the supporting hole 18 is arranged in the supporting hole; the front end of the supporting tube 19 penetrates out of the supporting hole 18 forwards, and the rear end of the supporting tube 19 penetrates out of the supporting hole 18 backwards; a front limiting pipe 20 attached to the side wall of the front side of the supporting frame 17 is sleeved outside the front part of the supporting pipe 19; a rear limiting pipe 21 attached to the side wall of the rear side of the support frame 17 is sleeved outside the rear part of the support pipe 19; the outer wall of the front end of the supporting tube 19 is provided with a front limit part 22, and the outer wall of the rear end of the supporting tube 19 is provided with a rear limit part 23; the supporting tube 19 is sleeved with a previous bearing 62 positioned between the side wall of the rear side of the front limiting part 22 and the front end face of the front limiting tube 20; the supporting tube 19 is sleeved with a rear bearing 24 positioned between the front side wall of the rear limiting part 23 and the rear end face of the rear limiting tube 21; the front end of the supporting tube 19 is connected with a front wheel 25 through a previous bearing 62; the rear end of the supporting tube 19 is connected with a rear wheel 26 through a rear bearing 24; the positions of the front wheel 25 and the rear wheel 26 correspond to the positions of the brake structure.

The middle part of the side wall of the front side of the front wheel 25 is provided with a front clamping step 27 which is annular; the middle part of the rear side wall of the rear wheel 26 is provided with a rear clamping step 28 which is annular; the front clamping step 27 and the rear clamping step 28 are respectively provided with a face cover 29 matched with the front clamping step and the rear clamping step.

The braking structure comprises arc-shaped side wings 30, and the outer walls of the front side and the rear side of the braking piece 14 are provided with the arc-shaped side wings 30; the arc-shaped side wings 30 arranged on the front outer wall of the brake member 14 are opposite to the front wheel 25, the arc-shaped side wings 30 arranged on the rear outer wall of the brake member 14 are opposite to the rear wheel 26, and a side wall of the front arc-shaped side wings 30 opposite to the front wheel 25 and a side wall of the rear arc-shaped side wings 30 opposite to the rear wheel are provided with a plurality of brake teeth 31 which are uniformly distributed.

The adjusting structure comprises an adjusting rod 32 arranged in the inner tube 2; the inner wall of the inner tube 2 and the outer wall of the adjusting rod 32 are both regular hexagons, and the inner wall of the inner tube 2 is attached to the outer wall of the adjusting rod 32; the inner wall of the pipe orifice at the upper end of the inner pipe 2 is provided with an annular limiting step 33; a screw joint 34 is arranged in the center of the upper end face of the adjusting rod 32; an adjusting nut 35 is screwed outside the upper end of the screw joint 34; a positioning head 36 is arranged on the upper surface of the adjusting nut 35; an upper spring 37 sleeved outside the screw joint 34 is arranged between the lower surface of the adjusting nut 35 and the limiting step 33; the lower surface of the stopper 16 is provided with a plurality of stopper teeth 38 uniformly distributed circumferentially.

The upper surface of the fixing piece 13 is provided with a plurality of stop grooves 39 corresponding to the stop teeth 38 in position; the stop tooth 38 is located directly above the stop tooth 38; the center of the fixing piece 13 is provided with a first through hole 40 which longitudinally penetrates through the fixing piece; the center of the brake member 14 is provided with a second through hole 41 longitudinally penetrating through the brake member, and the second through hole 41 is coaxial with the first through hole 40; a groove 42 communicated with the second through hole 41 is arranged in the middle of the upper surface of the brake piece 14; the right side groove wall of the groove 42 is inclined rightwards, and the hole opening at the upper end of the second through hole 41 is positioned on the right side groove wall of the groove 42; the inner wall of the hole at the upper end of the second through hole 41 is provided with a positioning step 43 in a ring shape; the middle part of the lower surface of the fixing piece 13 is provided with an embedded block 44 matched with the groove 42, and the embedded block 44 is in a right-angle triangle shape; a square slide bar 45 is arranged on the right-angle surface on the left side of the embedded block 44, and a chute 63 matched with the square slide bar 45 is arranged on the left side wall of the groove 42; a clamping hole 46 communicated with the first through hole 40 is formed in the inclined surface of the lower side of the embedded block 44, and the width of the clamping hole 46 is larger than the diameter of the first through hole 40; the center of the lower surface of the stopper 16 is provided with a moving rod 47; the lower end of the moving rod 47 sequentially passes through the first through hole 40, the clamping hole 46 and the notch at the upper end of the groove 42 downwards and penetrates into the hole at the upper end of the second through hole 41; a middle spring 48 sleeved outside the moving rod 47 is arranged between the bottom of the clamping hole 46 and the positioning step 43; an annular step 49 is arranged on the inner wall of the hole at the lower end of the second through hole 41; a lower spring 50 is arranged between the annular step 49 and the inner wall of the lower side of the rotating cover 9, and the upper part of the lower spring 50 is positioned in the orifice of the lower end of the second through hole 41; the right side of the upper surface of the brake member 14 is provided with a guide hole 51, and the lower surface of the fixing member 13 is provided with a guide rod 52 matched with the guide hole 51.

The upper end of the positioning head 36 is arc-shaped; the lower surface of the cam 4 is provided with an initial groove 53 matched with the positioning head 36; the lower right corner of the surface of the cam 4 is provided with an orientation groove 54 adjacent to the initial groove 53; the upper side of the surface of the cam 4 is provided with an arc-shaped universal groove 55, and the radian of the universal groove 55 is 90 degrees; the upper end of the outer tube 1 is provided with an upper cover 56 matched with the outer tube; the inner wall of the upper side of the upper cover 56 is provided with a top block 57 positioned in the middle of the universal groove 55.

A dust cover 58 is arranged outside the lower end of the outer tube 1; the dustproof cover 58 covers the upper end of the rotating cover 9 and the upper end of the connecting sleeve 10; the inner circumferential surface of the dust cover 58 is provided with an inner conical surface 59 with a narrow upper part and a wide lower part; the outer wall of the upper end of the connecting sleeve 10 is provided with an outer conical surface 60 with a narrow upper part and a wide lower part; a dust-proof gap 61 is provided between the inner cone 59 and the outer cone 60.

The application method of the utility model is as follows:

because the radian of the universal groove 55 is 90 degrees, when the top block 57 is positioned in the middle of the universal groove 55, if the cam 4 rotates 45 degrees anticlockwise or 45 degrees clockwise, the top block 57 can freely move in the universal groove 55 and is not blocked, so that smoothness of the clockwise and anticlockwise rotation of the cam 4 is ensured, when the cam 4 rotates clockwise, the upper end of the positioning head 36 slides into the orientation groove 54 along the transitional cambered surface between the initial groove 53 and the orientation groove 54, under the condition that the upper spring 37 is arranged between the lower surface of the adjusting nut 35 and the limiting step 33, when the positioning head 36 passes through the transitional cambered surface between the initial groove 53 and the orientation groove 54, the upper spring 37 is extruded and moves downwards in a proper direction, and when the positioning head 36 slides into the orientation groove 54, under the condition that external force is applied, the upper spring 37 clamps the positioning head 36 into the orientation groove 54 through self elasticity, at this time, the positioning head 36 completes the position adjustment, the adjusting rod 32 moves down synchronously with the positioning head 36, when the adjusting rod 32 moves down, the stop piece 16 drives the stop tooth 38 to move down vertically, the stop tooth 38 is embedded into the stop groove 39 on the upper surface of the fixing piece 13, the fixing piece 13 is limited by the planes on two sides of the fixing piece, and cannot rotate on the rotating cover 9, but only moves up and down along the inner wall of the rotating cover 9, the inner wall of the inner tube 2 and the outer wall of the adjusting rod 32 are all regular hexagons, the adjusting rod 32 cannot rotate relative to the inner tube, the adjusting rod 32 can only move up and down along the inner tube 2, therefore, the stop piece 16 cannot rotate horizontally by 360 degrees, after the stop tooth 38 is embedded into the stop groove, the stop tooth 38 can limit the rotation of the fixing piece 13, thereby limiting the rotation of the rotating cover 9 through the main bearing 7, the shell 11 is connected with the rotating cover 9 through the connecting sleeve 10, when the rotating cover 9 cannot rotate, the housing 11 and the front wheel 25 and the rear wheel 26 provided in the housing 11 cannot rotate horizontally by 360 degrees, so that the front wheel 25 and the rear wheel 26 are oriented, and the front wheel 25 and the rear wheel 26 can roll in only one direction.

When the cam 4 rotates anticlockwise, the positioning head 36 slides to the surface position of the cam 4 through the transitional cambered surface between the initial groove 53 and the surface of the cam 4, at this time, the surface of the cam 4 pushes the positioning head 36 downwards, so that the stroke of the downward movement of the positioning head 36 is larger than the stroke of the downward movement of the positioning head 36 clamped in the directional groove 54, at this time, the stop teeth 38 further penetrate into the stop groove 39, finally, the fixing piece 13 is pushed downwards, so that the fixing piece 13 moves downwards along the inner wall of the rotating cover 9, at this time, the square sliding bar 45 plays a guiding role with the guide rod 52, so that the fixing piece 13 is stably close to the upper surface of the braking piece 14, meanwhile, the middle spring 48 is continuously compressed, the lower spring 48 pushes the braking piece 14 downwards after being compressed to a certain extent, when the braking piece 14 moves downwards, the lower spring 50 is compressed and generates elasticity, the arc-shaped flanks arranged on the front and rear sides of the braking piece 14 move downwards along with the braking piece 14, the arc-shaped flanks arranged on the front and rear sides of the braking piece 14 move downwards, the front and rear side flanks and the front and rear side flanks 25 just rotate along with the rolling wheels 25, the arc flanks 25 and the rear side flanks 26 and the front and the rear side flanks 25 are just limited by the arc flanks 30, the arc-shaped flanks 30 and the arc flanks 30 can not rotate horizontally, and the arc flanks 30 can not be limited, and the arc-shaped flanks 30 can be further limited by the arc-shaped wheels 30 and the arc flanks 30 and the arc-shaped flanks 25 can be rotated just move along with the front and the front side wheels 25 and the front side flanks 25 and the front side 30 and the side 30.

As can be seen from the above, according to the utility model, the braking mode can be effectively changed by rotating the cam 4, when the front wheel 25 and the rear wheel 26 are required to be limited in an oriented manner, the cam 4 is only required to be rotated clockwise, so that the front wheel 25 and the rear wheel 26 can be limited to rotate horizontally by 360 degrees, the front wheel 25 and the rear wheel 26 can only roll stably in one direction and cannot freely turn, stability of the device when the device moves in one direction by using the universal wheel is ensured, when the front wheel 25 and the rear wheel 26 are required to be limited in an oriented manner and limited in a rolling manner, the front wheel 25 and the rear wheel 26 can be kept in place by only rotating the cam 4 anticlockwise, and meanwhile, the horizontal rotation of 360 degrees cannot be performed, so that the double braking effect is realized, the situation that the device is rocked due to the horizontal rotation of the universal wheel under the action of external force after the limited rolling is avoided, the stability of the device when the device is kept still is ensured to the maximum, and the safety of the device is ensured.

The front wheel 25 front side lateral wall middle part is equipped with one and is annular preceding screens step 27, and rear wheel 26 rear side lateral wall middle part is equipped with one and is annular back screens step 28, all is equipped with rather than assorted face lid 29 on preceding screens step 27 and the back screens step 28, and face lid 29 can play decorative effect under the sunken circumstances in front wheel 25 and rear wheel 26 middle part, makes front wheel 25 and rear wheel 26 reduce a large amount of materials reduce cost in self middle part and still can have splendid aesthetic property.

The lower end of the outer tube 1 is externally provided with a dust cover 58, the dust cover 58 covers the upper end of the rotating cover 9 and the upper end of the connecting sleeve 10, and the existence of the dust cover 58 can effectively prevent external dust from entering the upper end of the rotating cover 9 in a self-covering mode, so that the condition that the external dust leaks into the main bearing 7 through the rotating upper end is avoided, the inner peripheral surface of the dust cover 58 is provided with an inner conical surface 59 with a narrow upper part and a wide lower part, the outer wall of the upper end of the connecting sleeve 10 is provided with an outer conical surface 60 with a narrow upper part and a wide lower part, so that an inclined dust-proof gap 61 is formed between the inner conical surface 59 and the outer conical surface 60, the external dust is directly blocked in the dust-proof gap 61, the normal use of the main bearing 7 is prevented from being influenced by the external dust to the greatest extent, and an excellent dust-proof effect is achieved.

Claims (8)

1. The utility model provides an adjustable brake mode's universal wheel, includes the outer tube, locates the inner tube in the outer tube, and the inner tube lower extreme wears out outside the outer tube downwards, and both sides outer wall all is equipped with the perforation that link up with its inner space around the outer tube upper end, is equipped with in the outer tube upper end rather than assorted cam, and the cam center is equipped with the regulation hole coaxial with the perforation, and the regulation hole is regular hexagon, its characterized in that: the lower end of the inner pipe is provided with a tubular connector; the outer diameter of the connector is smaller than the outer diameter of the inner tube; the connector is sleeved with a main bearing attached to the lower end face of the inner tube; the outer wall of the lower end of the connector is outwards extended to form a limit flanging which is attached to the lower surface of the main bearing; the connector is connected with a rotating cover through a main bearing; the upper end of the rotating cover is externally provided with a connecting sleeve; the lower end of the connecting sleeve is provided with a shell covered outside the rotating cover; the lower surface of the shell is provided with a rolling opening communicated with the inner space of the shell; the rotary cover is positioned at the center of the left side of the inner space of the shell; a fixing piece is arranged in the upper part of the rotating cover; a brake piece matched with the fixing piece is arranged in the lower part of the rotating cover; the outer walls of the front side and the rear side of the rotating cover are provided with extending openings communicated with the inner space of the rotating cover; the left side and the right side of the brake piece are provided with mutually symmetrical brake structures, and the brake structures extend into the shell through the extending openings; a rolling structure matched with the braking structure is arranged in the right part of the shell; an adjusting structure matched with the cam is arranged in the inner tube; the adjustment structure includes a stop that mates with the mount.

2. The steerable brake mode universal wheel of claim 1, wherein: the rolling structure comprises a front support and a rear support which are arranged in the center of the inner wall of the upper side of the right part of the shell, the front support is attached to the front side wall of the rear support, and the front support and the rear support form a support frame; the lower part of the supporting frame is provided with a supporting hole; a supporting tube matched with the supporting hole is arranged in the supporting hole; the front end of the support tube penetrates out of the support hole forwards, and the rear end of the support tube penetrates out of the support hole backwards; a front limiting pipe attached to the side wall of the front side of the support frame is sleeved outside the front part of the support tube; the rear part of the supporting tube is sleeved with a rear limiting tube which is attached to the side wall of the rear side of the supporting frame; the outer wall of the front end of the support tube is provided with a front limit part, and the outer wall of the rear end of the support tube is provided with a rear limit part; the support tube is sleeved with a previous bearing positioned between the side wall of the rear side of the front limiting part and the front end face of the front limiting tube; the support tube is sleeved with a rear bearing which is positioned between the side wall of the front side of the rear limiting part and the rear end face of the rear limiting tube; the front end of the supporting tube is connected with a front wheel through a previous bearing; the rear end of the supporting tube is connected with a rear wheel through a rear bearing; the positions of the front wheel and the rear wheel correspond to the positions of the brake structure.

3. The steerable brake mode universal wheel of claim 2, wherein: the middle part of the side wall of the front side of the front wheel is provided with a front clamping step which is annular; the middle part of the side wall at the rear side of the rear wheel is provided with a rear clamping step which is annular; the front clamping step and the rear clamping step are respectively provided with a face cover matched with the front clamping step and the rear clamping step.

4. The steerable brake mode universal wheel of claim 2, wherein: the brake structure comprises arc-shaped side wings, and the outer walls of the front side and the rear side of the brake piece are provided with the arc-shaped side wings; the arc-shaped side wings arranged on the outer wall of the front side of the brake piece are opposite to the front wheel, the arc-shaped side wings arranged on the outer wall of the rear side of the brake piece are opposite to the rear wheel, and a side wall of the front arc-shaped side wings opposite to the front wheel and a side wall of the rear arc-shaped side wings opposite to the rear wheel are provided with a plurality of brake teeth which are uniformly distributed.

5. The adjustable brake mode universal wheel of claim 4, wherein: the adjusting structure comprises an adjusting rod arranged in the inner pipe; the inner wall of the inner tube and the outer wall of the adjusting rod are all regular hexagons, and the inner wall of the inner tube is attached to the outer wall of the adjusting rod; the inner wall of the pipe orifice at the upper end of the inner pipe is provided with an annular limiting step; a screw joint is arranged in the center of the upper end face of the adjusting rod; an adjusting nut is screwed outside the upper end of the screw joint; a positioning head is arranged on the upper surface of the adjusting nut; an upper spring sleeved outside the screw joint is arranged between the lower surface of the adjusting nut and the limiting step; the lower surface of the stop piece is provided with a plurality of stop teeth which are uniformly distributed in the circumference.

6. The adjustable brake mode universal wheel of claim 5, wherein: the upper surface of the fixing piece is provided with a plurality of stop grooves corresponding to the stop teeth in position; the stop tooth is positioned right above the stop groove; the center of the fixing piece is provided with a first through hole longitudinally penetrating through the fixing piece; the center of the brake piece is provided with a second through hole which longitudinally penetrates through the brake piece, and the second through hole is coaxial with the first through hole; a groove communicated with the second through hole is formed in the middle of the upper surface of the brake piece; the right groove wall of the groove is inclined rightwards, and the hole at the upper end of the second through hole is positioned on the right groove wall of the groove; the inner wall of the hole at the upper end of the second through hole is provided with an annular positioning step; the middle part of the lower surface of the fixing piece is provided with an embedded block matched with the groove, and the embedded block is in a right-angle triangular shape; a square slide bar is arranged on the right-angle surface on the left side of the embedded block, and a chute matched with the square slide bar is arranged on the left side wall of the groove; the lower inclined surface of the embedded block is provided with a clamping hole communicated with the first through hole, and the width of the clamping hole is larger than the diameter of the first through hole; the center of the lower surface of the stop piece is provided with a moving rod; the lower end of the moving rod sequentially passes through the first through hole, the clamping hole and the upper slot opening of the groove downwards and penetrates into the upper slot opening of the second through hole; a middle spring sleeved outside the movable rod is arranged between the bottom of the clamping hole and the positioning step; an annular step is arranged on the inner wall of the hole at the lower end of the second through hole; a lower spring is arranged between the annular step and the inner wall of the lower side of the rotating cover, and the upper part of the lower spring is positioned in the orifice of the lower end of the second through hole; the right side of the upper surface of the brake piece is provided with a guide hole, and the lower surface of the fixing piece is provided with a guide rod matched with the guide hole.

7. The adjustable brake mode universal wheel of claim 6, wherein: the upper end of the positioning head is arc-shaped; the lower surface of the cam is provided with an initial groove matched with the positioning head; the right lower corner of the cam surface is provided with an orientation groove adjacent to the initial groove; the upper side of the cam surface is provided with an arc-shaped universal groove, and the radian of the universal groove is 90 degrees; the upper end of the outer tube is provided with an upper cover matched with the outer tube; the inner wall of the upper side of the upper cover is provided with a top block positioned in the middle of the universal groove.

8. The steerable brake mode universal wheel of claim 1, wherein: a dust cover is arranged outside the lower end of the outer tube; the dustproof cover covers the upper end of the rotating cover and the upper end of the connecting sleeve; the inner peripheral surface of the dust cover is provided with an inner conical surface with a narrow upper part and a wide lower part; the outer wall of the upper end of the connecting sleeve is provided with an outer conical surface with a narrow upper part and a wide lower part; and a dustproof gap is arranged between the inner conical surface and the outer conical surface.