CN214325204U

CN214325204U - A brake mechanism and handcart for handcart

Info

Publication number: CN214325204U
Application number: CN202022825371.7U
Authority: CN
Inventors: 郭佛钟
Original assignee: Dongguan Jinwang Children Products Co ltd
Current assignee: Dongguan Jinwang Children Products Co ltd
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2021-10-01
Anticipated expiration: 2030-11-30

Abstract

The utility model discloses a brake mechanism for a handcart, which comprises a brake piece, a rear wheel seat and auxiliary teeth; the auxiliary teeth rotate synchronously with the rear wheel of the trolley, the rear wheel seat is fixed on the frame of the trolley, the brake piece is hinged on the rear wheel seat and comprises a locking part, the brake mechanism at least comprises a brake state and a non-brake state, and in the brake state, the brake piece rotates to a position where the locking part locks the auxiliary teeth, and the rear wheel is locked relative to the frame; when the bicycle is in a non-braking state, the braking piece rotates to a position where the locking part is separated from the auxiliary teeth, and the rear wheel is locked relative to the bicycle frame; be provided with angle location structure between brake spare and the rear wheel seat, angle location structure includes the elastic material spare, and at the in-process that the brake spare switches between brake state and non-brake state, the elastic material spare takes place extrusion deformation to can fix a position the brake spare at brake state or non-brake state. The utility model discloses in not needing the peripheral hardware metal elastic component, reduced the assemble duration, saved metal material, the cost is reduced.

Description

A brake mechanism and handcart for handcart

Technical Field

The utility model relates to a technical field of handcart especially relates to a brake mechanism and handcart for handcart.

Background

The existing handcart brake mechanism realizes the positioning in a braking state and a non-braking state through two rigid clamping structures and is configured with a metal spring for positioning and resetting. The configuration of the metal spring of the existing brake mechanism increases the assembly time on one hand and also increases the product cost; and the friction between the rigid materials is easy to wear, so that the problem that the brake structure is not flexible to brake or fails after being used for a period of time is caused, and the brake safety of the baby carrier is greatly influenced.

Accordingly, there is a need for a brake mechanism for a cart and a cart that reduces assembly time, is low cost, and improves safety.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art not enough, provide a reduce the brake mechanism and the handcart that are used for the handcart of assemble duration, with low costs and improve the security.

The technical scheme of the utility model provides a brake mechanism for a handcart, which is used for controlling the locking and unlocking of the rear wheel of the handcart relative to a frame, and comprises a brake piece, a rear wheel seat and auxiliary teeth; the auxiliary teeth rotate synchronously with the rear wheel of the handcart, the rear wheel seat is fixed on the frame of the handcart, the brake piece is hinged on the rear wheel seat,

the brake piece comprises a locking part, the brake mechanism at least comprises a brake state and a non-brake state,

when the vehicle is in the braking state, the braking piece rotates to a position where the locking part locks the auxiliary teeth, and the rear wheel is locked relative to the vehicle frame;

when the bicycle is in a non-braking state, the braking piece rotates to a position where the locking part is separated from the auxiliary teeth, and the rear wheel can rotate relative to the bicycle frame;

the brake piece with be provided with angle location structure between the rear wheel seat, angle location structure includes the elastic material piece, works as the in-process that the brake piece switches between brake state and non-brake state, the extrusion deformation takes place for the elastic material piece, and can with the brake piece location is in brake state or non-brake state. The scheme breaks through a rigid structure used by an angle positioning structure between a conventional brake piece and a rear wheel seat, realizes the positioning of the brake piece by utilizing the elastic deformation of an elastic material piece, reduces additional components such as springs and the like under the condition of keeping the positioning function, optimizes the design of a brake mechanism and saves the cost; and the friction between the rigid elements is changed into the friction between the elastic materials or the friction between the elastic materials and the rigid materials, so that the abrasion condition can be reduced.

Furthermore, the angle positioning structure comprises a positioning section and a positioning boss, the positioning boss is inserted into the positioning section and can move back and forth in the positioning section, the positioning section is arranged on one of the brake piece and the rear wheel seat, the positioning boss is arranged on the other of the brake piece and the rear wheel seat, and the elastic material piece is at least arranged on the positioning section and/or the contact surface of the positioning boss. The elastic material is arranged at least on the positioning section and/or the contact surface of the positioning boss, and the whole positioning section and/or the whole positioning boss are made of the elastic material. The positioning interval is an area which is only kept in contact with or matched with the positioning boss in the angular positioning process.

Furthermore, the positioning section comprises a squeezing surface, a first positioning surface and a second positioning surface, and the squeezing surface is positioned between the first positioning surface and the second positioning surface;

the elastic material piece is extruded and deformed when the positioning boss is contacted with the extrusion surface;

when the positioning boss enters the first positioning surface or the second positioning surface, the brake piece is positioned in the braking state or the non-braking state.

Furthermore, a deformation groove is formed below the extrusion surface, and when the extrusion surface is extruded, the deformation groove is compressed and deformed.

Furthermore, the first positioning surface and the second positioning surface are semicircular surfaces, a rounded angle is arranged at the edge of each semicircular surface, and the part corresponding to the contact of the positioning boss is a semicircle or a fan shape matched with the shape.

Further, the elastic material piece is made of a PP polypropylene material or a PA polyamide material.

Further, the locking part is a clamping groove, and in the braking state, the braking piece rotates to enable the clamping groove to be clamped with the auxiliary teeth.

Further, the locking part is an insert, and in the braking state, the braking piece rotates to enable the insert to be inserted between the adjacent auxiliary teeth.

The utility model also provides a handcart, including frame, front wheel and rear wheel, still include above-mentioned arbitrary brake mechanism.

Furthermore, the frame comprises a rear foot rod and a rear wheel shaft, the rear wheel seat is fixedly inserted into the rear foot rod, and the rear wheel shaft penetrates through the rear wheel seat and is connected with the rear wheel.

After adopting above-mentioned technical scheme, have following beneficial effect:

the utility model discloses in the elastic material spare through angle location structure, work as the in-process that the brake spare switches between brake state and non-brake state, the extrusion deformation takes place for the elastic material spare, and can with the brake spare location is at brake state or non-brake state. The utility model does not need to be externally provided with independent metal elastic structures such as springs and torsional springs, thereby reducing the assembly time, saving the use of metal materials and reducing the cost; just the utility model discloses a scheme can reduce the wearing and tearing between brake spare and the rear wheel seat, prolongs the life of brake spare, improves the security.

Drawings

The disclosure of the present invention will become more readily understood by reference to the drawings. It should be understood that: these drawings are for illustrative purposes only and are not intended to limit the scope of the present disclosure. In the figure:

fig. 1 is a schematic view of a cart according to a third embodiment of the present invention;

FIG. 2 is an enlarged view of the brake mechanism of FIG. 1;

fig. 3 is a schematic view of a brake mechanism in a braking state according to a first embodiment of the present invention;

fig. 4 is an exploded view of the brake mechanism according to the first embodiment of the present invention in a braking state;

FIG. 5 is a partial enlarged view of a brake mechanism according to a first embodiment of the present invention in a braking state;

fig. 6 is an exploded view of a brake mechanism according to a first embodiment of the present invention in a non-braking state;

FIG. 7 is a perspective view of a brake component according to a first embodiment of the present invention;

fig. 8 is a perspective view of a rear wheel seat according to a first embodiment of the present invention;

fig. 9 is a perspective view of an auxiliary gear and an auxiliary wheel seat according to a first embodiment of the present invention;

fig. 10 is a schematic view of a brake mechanism according to a second embodiment of the present invention;

fig. 11 is an exploded view of a brake mechanism according to a second embodiment of the present invention;

FIG. 12 is a schematic view of a brake component according to a second embodiment of the present invention;

fig. 13 is a schematic view of a rear wheel seat according to a second embodiment of the present invention;

fig. 14 is a schematic view of an auxiliary gear and an auxiliary wheel sleeve in a second embodiment of the present invention;

fig. 15 is a brake state diagram of the brake mechanism according to the second embodiment of the present invention;

fig. 16 is a non-braking state diagram of the brake mechanism according to the second embodiment of the present invention.

Reference symbol comparison table:

FIGS. 1 to 9:

the brake part 1: the clamping groove 11, the positioning section 12, the hinge point 13, the ear plate 14, the first positioning surface 121, the second positioning surface 122, the extrusion surface 123 and the deformation groove 124;

rear wheel seat 2: the positioning boss 21, the pipe sleeve 22, the shaft hole 23 and the hinge block 24; an auxiliary tooth 3;

an auxiliary wheel sleeve 4;

rear wheel 10, frame 20, front wheel 30, rear foot bar 201, rear wheel axle 202.

FIGS. 10 to 16:

the brake part 1: the plug-in 11 ', the positioning convex part 12', the first hinge hole 13 'and the anti-skid surface 14';

rear wheel seat 2: the device comprises a first positioning groove 21 ', a second positioning groove 22 ', a squeezing surface 23 ', an ear plate 24 ', a second hinge point 25 ', a pipe sleeve 26 ' and a shaft hole 27 ';

auxiliary teeth 3 and an auxiliary wheel sleeve 4;

Detailed Description

The following describes the present invention with reference to the accompanying drawings.

It is easily understood that, according to the technical solution of the present invention, a plurality of structural modes and implementation modes that can be mutually replaced by those of ordinary skill in the art can be achieved without changing the spirit of the present invention. Therefore, the following detailed description and the accompanying drawings are only exemplary illustrations of the technical solutions of the present invention, and should not be construed as limiting or restricting the technical solutions of the present invention in its entirety or as a limitation of the present invention.

The terms of orientation of up, down, left, right, front, back, top, bottom, and the like referred to or may be referred to in this specification are defined relative to the configuration shown in the drawings, and are relative terms, and thus may be changed correspondingly according to the position and the use state of the device. Therefore, these and other directional terms should not be construed as limiting terms.

The first embodiment is as follows:

fig. 3 to 9 are schematic views of the brake mechanism according to the first embodiment.

A braking mechanism for a trolley for controlling the locking and unlocking of the rear wheel 10 of the trolley with respect to the frame 20, comprising a braking member 1, a rear wheel seat 2 and an auxiliary tooth 3; the auxiliary teeth 3 rotate synchronously with the rear wheel 10 (see fig. 2) of the handcart, the rear wheel seat 2 is fixed on the frame 20 of the handcart, the brake piece 1 is hinged on the rear wheel seat 2,

the brake component 1 comprises a clamping groove 11, the brake mechanism at least comprises a brake state and a non-brake state,

when the bicycle is in a braking state, the braking piece 1 rotates to a position where the clamping groove 11 is clamped with the auxiliary teeth 3, and the rear wheel 10 is locked relative to the bicycle frame 20;

when the bicycle is in a non-braking state, the braking piece 1 rotates to a position where the clamping groove 11 is separated from the auxiliary teeth 3, and the rear wheel 10 can rotate relative to the bicycle frame 20;

be provided with angle location structure between brake spare 1 and rear wheel seat 2, angle location structure includes the elastic material spare, and at the in-process that brake spare 1 switched between brake state and non-brake state, the elastic material spare takes place extrusion deformation to can fix a position brake spare 1 at brake state or non-brake state.

Specifically, in this embodiment, as shown in fig. 2-3, the auxiliary gear 3 is mounted on the auxiliary gear sleeve 4, the auxiliary gear sleeve 4 is fixedly mounted on the rear wheel 10, and when the rear wheel 10 rotates, the auxiliary gear sleeve 4 and the auxiliary gear 3 are driven to rotate together.

Alternatively, the auxiliary sleeve 4 may not be provided, and the auxiliary teeth 3 may be directly mounted on the inner side of the rear wheel 10.

As shown in fig. 2, the rear wheel seat 2 is fixedly mounted on the frame 20, and the rear wheel seat 2 is located inside the rear wheel 10.

The brake piece 1 is hinged with the rear wheel seat 2, and the brake piece 1 can swing up and down relative to the rear wheel seat 2.

As shown in fig. 3, the braking member 1 is provided with a slot 11, and the slot 11 is used for matching with the auxiliary teeth 3. In fig. 3, the auxiliary tooth 3 is inserted into the slot 11, so that the auxiliary tooth 3 is locked, and the rear wheel 10 is locked, so that the trolley cannot be pushed, and the trolley is in a braking state.

As shown in fig. 6, the brake component 1 rotates upward relative to the rear wheel seat 2, so that the engaging groove 11 is disengaged from the auxiliary tooth 3, the auxiliary tooth 3 can be driven by the rear wheel 10 to rotate, and cannot interfere with the engaging groove 11, so as to unlock the rear wheel 10, and at this time, the brake component is in a non-braking state.

When the non-braking state needs to be switched to the braking state again, the braking piece 1 is rotated downwards, so that the clamping groove 11 is clamped with the auxiliary tooth 3 again.

Alternatively, when the braking piece 1 rotates upwards, the auxiliary teeth 3 are locked to switch to the braking state; when the brake pedal rotates downwards, the auxiliary gear 3 is unlocked and is switched to a non-braking state.

In this embodiment, through the elastic material member of the angle positioning structure, when the brake member 1 is switched between the braking state and the non-braking state, the elastic material member is extruded and deformed, and the brake member 1 can be positioned in the braking state or the non-braking state. In the embodiment, a rigid structure used by an angle positioning structure between a conventional brake piece and a rear wheel seat is broken through, the brake piece is positioned by utilizing the elastic deformation of the elastic material piece, additional components such as springs and the like are reduced under the condition of keeping the positioning function, the design of a brake mechanism is optimized, and the cost is saved; and the friction between the rigid elements is changed into the friction between the elastic materials or the friction between the elastic materials and the rigid materials, so that the abrasion condition can be reduced.

Furthermore, the angle positioning structure comprises a positioning section and a positioning boss, the positioning boss is inserted into the positioning section and can move back and forth in the positioning section, the positioning section is arranged on one of the brake piece and the rear wheel seat, the positioning boss is arranged on the other of the brake piece and the rear wheel seat, and the elastic material piece is arranged on the contact surface of the positioning section and/or the positioning boss.

In the first embodiment, as shown in fig. 3-6, the positioning section 12 is disposed on the brake element 1, the positioning boss 21 is disposed on the rear wheel seat 2, and the positioning section 12 is made of an elastic material, i.e. the elastic material is integrated with the positioning section 12; the positioning boss 21 is made of a hard plastic material.

Between the positioning boss 21 and the positioning section 12, in the switching process from the braking state to the non-braking state, the positioning section 12 is extruded and deformed, so that the positioning section 12 and the positioning boss 21 keep a relatively stable relationship.

When the brake is in the braking state and the non-braking state, the positioning boss 21 and the positioning section 12 realize positioning, and the brake piece 1 is kept in the positions of the braking state and the non-braking state. At this time, the positioning section 12 and the positioning boss 21 may be pressed and deformed or may be positioned without being pressed and deformed.

The matching between the positioning boss 21 and the positioning section 12 avoids the problem that the positioning boss is sheared off or abraded due to overlarge shearing force, and the service life is prolonged.

Alternatively, it is also possible that the positioning boss 21 is made of an elastic material and the positioning section 12 is made of a hard plastic material. Or the positioning boss 21 and the positioning section 12 are made of elastic materials. Or the elastic material part is a layer of rubber layer and is coated on the contact surface between the positioning lug boss 21 and/or the positioning section 12.

The elastic material is arranged at least on the contact surface of the positioning section 12 and/or the positioning projection 21, including the case that the entire positioning section 12 and/or the entire positioning projection 21 is made of elastic material. The positioning section 12 is the area which is only in contact with or co-operates with the positioning boss 21 during angular positioning.

Further, as shown in fig. 5 and 7, the positioning section 12 includes a pressing surface 123, a first positioning surface 121, and a second positioning surface 122, and the pressing surface 123 is located between the first positioning surface 121 and the second positioning surface 122;

the elastic material piece is pressed and deformed when the positioning boss 21 is in contact with the pressing surface 123;

when the positioning boss 21 enters the first positioning surface 121 or the second positioning surface 122, the brake piece 1 is positioned in the braking state or the non-braking state.

Specifically, under normal conditions, the pressing surface 123 protrudes outward relative to the first positioning surface 121 and the second positioning surface 122, the first positioning surface 121 and the second positioning surface 122 are recessed downward, and the positioning boss 21 protrudes outward.

When the positioning boss 21 contacts with the extrusion surface 123, the extrusion surface 123 is extruded and deformed, and a certain elastic deformation force exists between the positioning boss 21 and the extrusion surface 123, so that the braking piece 1 is subjected to a certain damping force in the rotating process, and when the braking piece 1 is not pushed to rotate, the braking piece 1 can stop at any position of the extrusion surface 123 and keeps relatively positioned or fixed with the rear wheel seat 2.

With the rotation of the brake piece 1, the positioning boss 21 slides from the pressing surface 123 to the first positioning surface 121 or the second positioning surface 122, the positioning boss 21 is clamped into the first positioning surface 121 or the second positioning surface 122, and is positioned at the position by the first positioning surface 121 or the second positioning surface 122, so that the positioning in the braking state or the non-braking state is realized.

When the positioning boss 21 enters the first positioning surface 121 or the second positioning surface 122, a small compressive deformation may still be maintained between the positioning boss and the first positioning surface 121 or the second positioning surface 122, or only positioning may be achieved without compressive deformation.

Alternatively, the positioning section 12 can also be arranged on the rear wheel seat 2 and the positioning projection can be arranged on the brake element 1.

Further, as shown in fig. 7, a deformation groove 124 is formed below the pressing surface 123, and when the pressing surface 123 is pressed, the deformation groove 124 is compressed and deformed.

The deformation groove 124 is a through groove formed below the pressing surface 123 on the brake element 1, so that the thickness of the part where the pressing surface 123 is located is reduced, the part is more easily pressed and deformed, and the deformation is elastic deformation.

Further, as shown in fig. 7, the first positioning surface 121 and the second positioning surface 122 are semi-circular surfaces, and the edges of the semi-circular surfaces are provided with rounded corners, and the portions corresponding to the contact of the positioning bosses 21 are semi-circles or sectors with matching shapes. The positioning boss 21 is convenient to reduce friction in moving out of and entering the first positioning surface 121 and the second positioning surface 122.

Preferably, the elastic material is made of a PP polypropylene material, or a PA polyamide material. When the elastic material piece is integrated with the positioning boss and the positioning section, the positioning boss and the positioning section are made of PP polypropylene materials or PA polyamide materials. The brake element 1 and the rear wheel seat 2 can be made partly or entirely of PP polypropylene material, or PA polyamide material.

Furthermore, the brake piece 1 is a brake pedal, the clamping groove 11 is arranged on the brake pedal, and the brake pedal is hinged with the rear wheel seat 2.

When the brake state needs to be switched, the foot of the user treads the brake pedal downwards, so that the clamping groove 11 is clamped with the auxiliary teeth 3, and the brake of the rear wheel 10 is realized.

Optionally, the brake component 1 can also be a brake handle, and the brake handle extends upwards, so that a user can switch to a braking state when lifting the hand upwards.

Further, as shown in fig. 7, the brake component 1 further includes a pedal 15 and two ear plates 14, the ear plates extend from the pedal 15, the pedal 15 is used for a user to step on to drive the brake component 1 to rotate, the ear plates 14 are provided with hinge points 13, and the hinge points 13 are hinged to the rear wheel seat 2. The edge of the ear plate 14 is provided with a positioning section 12, and two clamping grooves 11 are arranged below the ear plate 14.

As shown in fig. 8, the rear wheel seat 2 further includes a tube sleeve 22, a shaft hole 23 and a hinge block 24, the hinge block 24 is inserted between the two ear plates 14 and is hinged to the ear plates 14, the tube sleeve 22 is sleeved outside a rod member of the frame 20, and the shaft hole 23 is used for a rear wheel shaft 202 of the frame 20 to pass through.

Further, as shown in fig. 9, there are a plurality of auxiliary teeth 3, and a plurality of auxiliary teeth 3 are arranged at intervals in a wheel shape and are disposed on the auxiliary wheel cover 4, and the auxiliary wheel cover 4 is coaxially and fixedly connected with the rear wheel 10. The auxiliary wheel sleeve 4 is a hollow cylinder and is covered on the inner side of the rear wheel 10.

When the rear wheel 10 rotates, the auxiliary teeth 3 are driven to rotate synchronously, and when the brake piece 1 rotates downwards, the two clamping grooves 11 are clamped with the two auxiliary teeth 3.

In the first embodiment, the brake mechanism is used as follows:

as shown in fig. 6, in the non-braking state, the rear wheel seat 2 is fixedly connected with the frame 20, the auxiliary teeth 3 and the auxiliary gear sleeve 4 are fixedly connected with the rear wheel 10, the cart can be pushed normally, the rear wheel 10 rotates, and the auxiliary teeth 3 are driven to rotate synchronously. At this time, the positioning boss 21 is engaged with the second positioning surface 122 to position the brake shoe 1 at a position not interfering with the auxiliary teeth 3.

As shown in fig. 4, when a brake is required, the brake piece 1 is stepped down, the brake piece 1 rotates downward, the engaging groove 11 rotates to engage with the auxiliary tooth 3 at the corresponding position, and the engaging groove 11 locks the auxiliary tooth 3, so that the rear wheel 10 is locked and switched to a braking state. At this time, the positioning boss 21 is snapped into the first positioning surface 121 so that the brake member 1 is held in the braking position. The brake piece 1 and the auxiliary tooth 3 are not easy to be disengaged even if the handcart is pushed forcibly.

The extrusion surface 123 in the positioning section 12 slides relative to the positioning boss 21 along with the brake piece 1, and the extrusion surface 123 is extruded and deformed in the sliding process, so that the brake piece 1 is subjected to a certain damping force in the rotating process, and the brake piece does not shake.

In the embodiment, a metal elastic part is not required to be arranged independently to connect the brake part and the rear wheel seat, so that the assembly process is simplified, the material is saved, and the cost is reduced; and the abrasion between the brake piece and the rear wheel seat can be reduced, the service life of the brake piece is prolonged, and the safety is improved.

Example two:

a braking mechanism for a trolley for controlling the locking and unlocking of the rear wheel 10 of the trolley with respect to the frame 20, comprising a braking member 1, a rear wheel seat 2 and a plurality of auxiliary teeth 3; the auxiliary teeth 3 rotate synchronously with the rear wheel 10 of the handcart, the rear wheel seat 2 is fixed on the frame 20 of the handcart, the brake piece 1 is hinged on the rear wheel seat 2,

the braking piece 1 comprises an insert 11', the braking mechanism at least comprises a braking state and a non-braking state,

in the braking state, the braking piece 1 rotates to enable the insert 11' to be inserted between the adjacent auxiliary teeth 3, and the rear wheel 10 is locked relative to the frame 20;

in the non-braking state, the braking piece 1 rotates to enable the insert 11' to be disengaged from the position between the adjacent auxiliary teeth 3, and the rear wheel 10 can rotate relative to the frame 20;

Specifically, in this embodiment, as shown in fig. 10, the auxiliary gear 3 is mounted on the auxiliary gear sleeve 4, the auxiliary gear sleeve 4 is fixedly mounted on the rear wheel 10, and when the rear wheel 10 rotates, the auxiliary gear sleeve 4 and the auxiliary gear 3 are driven to rotate together.

As shown in fig. 1, the rear wheel seat 2 is fixedly mounted on the frame 20, and the rear wheel seat 2 is located inside the rear wheel 10.

As shown in fig. 10-11, the brake element 1 is provided with an insert 11 ', the insert 11' being intended to cooperate with the auxiliary tooth 3. In fig. 15 the insert 11' is inserted between adjacent auxiliary teeth 3 and locks the auxiliary teeth 3 and thus the rear wheel 10 such that the trolley cannot be pushed, in this case the braking situation.

As shown in fig. 16, the brake element 1 rotates upward relative to the rear wheel seat 2, so that the insert 11 'is disengaged from the auxiliary tooth 3, the auxiliary tooth 3 can be driven to rotate by the rear wheel 10, and will not interfere with the insert 11', so as to unlock the rear wheel 10, which is in a non-braking state.

When it is desired to switch from the non-braking condition to the braking condition again, the braking member 1 is turned downwards so that the insert 11' is again inserted between adjacent auxiliary teeth 3.

In this embodiment, through the elastic material member of the angle positioning structure, when the brake member 1 is switched between the braking state and the non-braking state, the elastic material member is extruded and deformed, and the brake member 1 can be positioned in the braking state or the non-braking state. Independent metal elastic structures such as springs and torsion springs do not need to be arranged outside, so that the assembly time is shortened, the use of metal materials is saved, and the cost is reduced.

Furthermore, the angle positioning structure comprises a positioning convex part 12 ', two positioning grooves and a pressing surface 23 ' positioned between the two positioning grooves, the positioning grooves are arranged on one of the brake piece 1 and the rear wheel seat 2, the positioning convex part 12 ' is arranged on the other of the brake piece 1 and the rear wheel seat 2, and the elastic material part is arranged on the contact surface of the pressing surface 23 ' and/or the positioning convex part 12 ';

the positioning convex part 12 'is in close contact with the extrusion surface 23' when moving between the two positioning grooves;

when the positioning convex piece 12' is clamped into the positioning groove, the braking mechanism is in a braking state or a non-braking state.

In the first embodiment, as shown in fig. 11. The positioning convex part 12 'is arranged on the brake part 1, the rear wheel seat 2 is provided with two positioning grooves, namely a first positioning groove 21' and a second positioning groove 22 ', and the extrusion surface 23' is positioned in the area between the first positioning groove 21 'and the second positioning groove 22'. The positioning lug 12 'is formed integrally with the elastic material part, and the pressing surface 23' is made of a hard plastic material.

When the positioning convex part 12 ' slides between the first positioning groove 21 ' and the second positioning groove 22 ', the positioning convex part is contacted with the extrusion surface 23 ', the extrusion surface 23 ' enables the positioning convex part 12 ' to be extruded and deformed, so that certain damping force is generated in the rotation process of the brake part 1, the brake part 1 is prevented from shaking in the rotation process, and when the brake part 1 is not applied with rotation force, the brake part 1 can stay at any position of the extrusion surface 23 '. When the positioning projection 12 'enters the first positioning groove 21' or the second positioning groove 22 ', the positioning projection 12' is positioned at the position by the first positioning groove 21 'or the second positioning groove 22'.

In this embodiment, the first positioning groove 21 'is used for positioning the position in the braking state, and the second positioning groove 22' is used for positioning the position in the non-braking state.

When entering the positioning groove, the positioning convex part 12' is not pressed and deformed, but is limited in the positioning groove and is not easy to fall out. When the brake member 1 needs to be rotated again, a large rotating force is applied, so that the positioning projection 12 'is deformed to come out of the positioning groove, and is again brought into contact with the pressing surface 23' and is pressed and deformed.

Alternatively, the positioning lug 12 'can also be arranged on the rear wheel seat 2, the positioning groove and the pressing surface 23' being arranged on the brake element 1.

Alternatively, it is also possible that the pressing surface is made of an elastic material and the positioning projection 12' is made of a hard plastic material. Or the positioning lug 12 'and the pressing surface 23' are both made of an elastic material. Or the elastic material element is a rubber layer and is coated on the contact surface between the positioning convex element 12 'and/or the extrusion surface 23'.

Further, as shown in fig. 11, the positioning protrusion 12' is a hemisphere, and the positioning groove is a circular through hole. When the positioning convex part 12' enters the positioning groove, the hemispheroid is embedded into the circular through hole.

Furthermore, the angle positioning structure further comprises two ear plates 24 ', two positioning grooves are formed in the ear plates 24', the squeezing surface 23 'is positioned between the two positioning grooves in the ear plates 24', and the positioning convex part 12 'is inserted between the two ear plates 24'.

In the first embodiment, as shown in fig. 13, two ear plates 24 ' extend from the rear wheel seat 2, and the ear plates 24 ' are formed with a first positioning groove 21 ', a second positioning groove 22 ' and a second hinge point 25 '.

As shown in fig. 12, a first hinge point 13 'is formed on the corresponding brake element 1, the first hinge point 13' is hinged to the second hinge point 25 ', and when the hinge points rotate relatively, the positioning protrusion 12' can move between the first positioning groove 21 'and the second positioning groove 22'.

Further, as shown in fig. 13, the rear wheel seat 2 further includes a tube sleeve 26 'and a shaft hole 27', the tube sleeve 26 'is sleeved on a rod of the frame 20 and is fixedly connected, and the shaft hole 27' is used for connecting a rear wheel shaft 202 (see fig. 10) of the frame 20 with the rear wheel 10 after passing through.

Further, as shown in fig. 10, the insert 11' is an arc-shaped plate, and the thickness of the arc-shaped plate becomes gradually thicker toward the direction in which the auxiliary teeth are located.

Two arc plates are symmetrically arranged on the brake piece 1, wherein one plate close to the auxiliary tooth 3 is an insertion piece 11' which can be matched with the auxiliary tooth 3, and the other arc plate does not work. Two arc plates on the brake piece 1 are symmetrically arranged, so that the brake piece 1 can be suitable for being installed on brake mechanisms on the left side and the right side, and the universality of parts is improved.

Further, as shown in fig. 12, the braking member 1 is a brake pedal, and an anti-slip surface 14' is arranged above the braking member 1, so that a user can conveniently step on the braking member.

When the brake state needs to be switched, the foot of the user downwards steps on the brake pedal, so that the plug-in 11' is clamped with the auxiliary teeth 3, and the brake of the rear wheel 10 is realized.

When it is desired to switch to the non-braking condition, the user's foot turns the brake member 1 upwards from the bottom of the brake member 1, so that the insert 11' is disengaged from between the auxiliary teeth 3.

Preferably, the elastic material is made of a PP polypropylene material, or a PA polyamide material. When the elastic material piece is integrated with the positioning boss and the positioning groove, the positioning boss and the positioning groove are made of PP polypropylene materials or PA polyamide materials. The brake element 1 and the rear wheel seat 2 can be made partly or entirely of PP polypropylene material, or PA polyamide material.

Further, as shown in fig. 14, there are a plurality of auxiliary teeth 3, the plurality of auxiliary teeth 3 are arranged in a wheel shape at intervals and are disposed on an auxiliary wheel sleeve 4, the auxiliary wheel sleeve 4 is coaxially and fixedly connected with the rear wheel 10, and the auxiliary wheel sleeve 4 is a hollow cylinder and covers the inner side of the rear wheel 10.

In the second embodiment, the brake mechanism is used as follows:

as shown in fig. 16, in the non-braking state, the rear wheel seat 2 is fixedly connected with the frame 20, the auxiliary teeth 3 and the auxiliary gear sleeve 4 are fixedly connected with the rear wheel 10, the cart can be pushed normally, the rear wheel 10 rotates, and the auxiliary teeth 3 are driven to rotate synchronously. At this time, the positioning projection 12 ' is snapped into the second positioning groove 22 ' to position the brake element 1 in a position where the insert 11 ' does not interfere with the auxiliary teeth 3.

As shown in fig. 15, when braking is required, the braking member 1 is stepped down, the braking member 1 rotates downward, the insert 11 'rotates to be inserted between two adjacent auxiliary teeth 3 at the corresponding position, and the insert 11' locks the auxiliary teeth 3, so that the rear wheel 10 is locked and switched to the braking state. At this time, the positioning projection 12 'is snapped into the first positioning groove 21' so that the brake element 1 is held in the braking position. The brake piece 1 and the auxiliary tooth 3 are not easy to be disengaged even if the handcart is pushed forcibly.

When the positioning convex part 12 ' slides between the extrusion surfaces 23 ' between the first positioning groove 21 ' and the second positioning groove 22 ', the extrusion surfaces 23 ' extrude and deform, so that the brake part 1 is subjected to certain damping force in the rotating process, and cannot shake.

In the embodiment, the metal elastic part is not required to be arranged independently to connect the brake part and the rear wheel seat, so that the assembly process is simplified, the material is saved, and the cost is reduced.

Example three:

as shown in fig. 1-2, the cart includes a frame 20, a front wheel 30, and a rear wheel 10, and further includes a brake mechanism in the first embodiment, the second embodiment, and the modifications thereof.

Further, the frame 20 includes a rear foot bar 201 and a rear wheel axle 202, the rear wheel seat 2 is fixed to the rear foot bar 201 in an inserting manner, and the rear wheel axle 202 penetrates through the rear wheel seat 2 and is connected to the rear wheel 10.

As shown in fig. 4, one end of the rear wheel axle 202 is connected to the rear wheel 10 after passing through the rear wheel seat 2 and the auxiliary wheel seat 4.

Specifically, two sets of brake mechanisms are mounted on the cart and are respectively located at the left end and the right end of the rear wheel shaft 202, and the rear wheel shaft 202 is used for connecting the two rear wheels 10.

When one of the brake pieces 1 is stepped on, the brake of the rear wheel 10 on the corresponding side can be realized, and when both the brake pieces 1 are stepped on, both the rear wheels 10 can be locked.

Optionally, a linkage rod can be added between the two brake pieces 1, and when any one brake piece 1 is trampled, synchronous braking of the other brake piece 1 can be realized.

What has been described above is merely the principles and preferred embodiments of the present invention. It should be noted that, for those skilled in the art, on the basis of the principle of the present invention, several other modifications can be made, and the protection scope of the present invention should be considered.

Claims

1. A brake mechanism for a trolley for controlling the locking and unlocking of the rear wheel (10) of the trolley with respect to the frame (20) comprises a brake member (1), a rear wheel seat (2) and auxiliary teeth (3); the auxiliary teeth (3) rotate synchronously with the rear wheel (10) of the trolley, the rear wheel seat (2) is fixed on the frame (20) of the trolley, the brake piece (1) is hinged on the rear wheel seat (2), the trolley is characterized in that,

the brake piece (1) comprises a locking part, the brake mechanism at least comprises a brake state and a non-brake state,

when the brake is in the braking state, the brake piece (1) rotates to a position where the locking part locks the auxiliary teeth (3), and the rear wheel (10) is locked relative to the frame (20);

when the brake is in the non-braking state, the brake piece (1) rotates to a position where the locking part is separated from the auxiliary teeth (3), and the rear wheel (10) can rotate relative to the frame (20);

brake spare (1) with be provided with angle location structure between rear wheel seat (2), angle location structure includes the elastic material spare, works as the in-process that brake spare (1) switched between brake state and non-brake state, the elastic material spare takes place extrusion deformation, and can with brake spare (1) location is at brake state or non-brake state.

2. Brake mechanism for trolleys according to claim 1, wherein the angular positioning means comprise a positioning section (12) and a positioning boss (21), the positioning boss (21) being inserted into the positioning section (12) and being able to move back and forth in the positioning section (12), the positioning section (12) being provided on one of the brake piece (1) and the rear wheel seat (2), the positioning boss (21) being provided on the other of the brake piece (1) and the rear wheel seat (2), the piece of elastic material being provided at least on the contact surface of the positioning section (12) and/or the positioning boss (21).

3. A brake mechanism for a trolley according to claim 2, characterised in that the locating section (12) comprises a pressing surface (123), a first locating surface (121) and a second locating surface (122), the pressing surface (123) being located between the first locating surface (121) and the second locating surface (122);

the elastic material piece is extruded and deformed when the positioning boss (21) is contacted with the extrusion surface (123);

when the positioning boss (21) enters the first positioning surface (121) or the second positioning surface (122), the brake piece (1) is positioned in the braking state or the non-braking state.

4. A brake mechanism for a trolley according to claim 3, wherein a deformation groove is formed below the pressing surface (123), and the deformation groove (124) is compressed and deformed when the pressing surface (123) is pressed.

5. A brake mechanism for trolleys according to claim 3, wherein said first (121) and second (122) locating surfaces are semi-circular surfaces, and wherein said semi-circular surfaces are provided with rounded corners near the edges, and the portions corresponding to the contact of said locating bosses (21) are in the form of matching semi-circles or sectors.

6. A brake mechanism for a trolley according to claim 1, wherein the resilient material is made of PP polypropylene material or PA polyamide material.

7. Brake mechanism for trolleys according to claim 1, wherein said locking portion is a catch (11), and in said braking condition, said braking member (1) is rotated to engage said catch (11) with said auxiliary tooth (3).

8. Brake mechanism for trolleys according to claim 1, wherein said locking portion is an insert (11 '), and in said braking condition, said brake member (1) is rotated so as to insert said insert (11') between adjacent auxiliary teeth (3).

9. A trolley comprising a frame (20), a front wheel (30) and a rear wheel (10), characterized in that it further comprises a brake mechanism according to any one of claims 1-8.

10. A trolley according to claim 9, characterized in that the frame (20) comprises a rear foot bar (201) and a rear wheel axle (202), the rear wheel holder (2) being fixed in connection with the rear foot bar (201), the rear wheel axle (202) passing through the rear wheel holder (2) and being connected to the rear wheel (10).