CN110450845B - Braking mechanism and trolley using the same - Google Patents

Abstract

The invention discloses a brake mechanism and a handcart using the same, wherein the brake mechanism comprises a first locking part arranged on a wheel hub, a second locking part sleeved on a wheel connecting shaft in a sliding way and a pushing part pushing the second locking part to slide to the first locking part on the connecting shaft, a locking bulge or a locking groove for limiting the rotation of a wheel is arranged on the first locking part, and a locking groove or a locking bulge matched with the locking bulge or the locking groove is arranged on the second locking part; the pushing part comprises a rotating part sleeved on the connecting shaft, a blocking part for the rotating part to lean against and fixedly connected with the connecting shaft, and a rotating pushing structure arranged between the rotating part and the blocking part, and the rotating pushing structure pushes the rotating part to move towards the second locking part when the rotating part rotates.

Description

Braking mechanism and trolley using the same

Technical Field

The invention relates to a brake mechanism and a cart using the brake mechanism, belonging to the field of baby carts.

Background technique

Children's cars are commonly used as a means of leisure, entertainment and transportation for children. When a common children's car brakes, the brake pads rub against the wheels to stop the wheels from rotating. This type of brake structure causes great damage to the wheel tires, and children do not have much strength. In many cases, the children's car needs to rub for a certain distance before it can stop moving forward. In this case, danger cannot be avoided in time.

Summary of the invention

In view of the deficiencies of the prior art, the present invention provides a brake mechanism that can achieve braking without rubbing tires.

To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a brake mechanism, comprising a first locking portion arranged on a wheel hub, a second locking portion slidably mounted on a wheel connecting shaft, and a pushing portion pushing the second locking portion to slide on the connecting shaft toward the first locking portion, the first locking portion being provided with a locking protrusion or a locking groove for limiting the rotation of the wheel, the second locking portion being provided with a locking groove or a locking protrusion matching the locking protrusion or the locking groove; the pushing portion comprising a rotating portion mounted on the connecting shaft, a blocking portion for the rotating portion to abut against and fixedly connected to the connecting shaft, and a rotating pushing structure being arranged between the rotating portion and the blocking portion, and the rotating pushing structure pushing the rotating portion to move toward the second locking portion when the rotating portion rotates; a brake mechanism with such a setting can achieve braking without rubbing the wheel, and at the same time, compared with friction brakes, the present invention does not require a lot of force to achieve braking, and the brake can be braked by stepping on the foot, which is more convenient for children to use.

The present invention is further configured such that the rotating pushing structure includes a protrusion or sliding surface arranged on the side wall of the rotating part and a sliding surface or protrusion arranged at a corresponding position on the side wall of the blocking part, the protrusion slides on the sliding surface, the sliding surface is arranged along the rotation direction of the rotating body, and the sliding surface intersects with a vertical plane of the axis of the connecting shaft; this configuration enables the rotating body to approach or move away from the wheel when the protrusion slides on the sliding surface, thereby pushing the second locking part to approach or move away from the wheel so that the locking protrusion sinks into the locking groove or the locking protrusion disengages from the locking groove.

The present invention is further configured such that the sliding surface is an inclined surface or at least has a section of an inclined surface, the inclined surface is inclined relative to the longitudinal section of the connecting shaft, and a pedal for stepping on is provided on the rotating body.

The present invention is further configured such that the sliding surface has at least one inclined surface, the surface where the protrusion contacts the sliding surface is a curved surface containing a section of the inclined surface, the middle of the sliding surface is an inclined surface, and the two ends are transition surfaces that cooperate with the curved surface of the protrusion; the transition surface is a curved surface, and the setting of the transition surface curve makes the braking process smoother.

The present invention is further configured such that the sliding surface is a smooth curved surface.

The present invention is further configured such that the blocking portion or the side wall of the rotating body is concave to form a slide groove, and the sliding surface forms the bottom surface of the slide groove; the side wall of the slide groove can block the protrusion to prevent the protrusion from flipping over, thereby preventing the rotating body from shaking during braking.

The present invention is further configured such that the first locking portion is in the shape of a circular cylinder, and the locking protrusion or locking groove is arranged on the end face of the circular cylinder-shaped first locking portion; the second locking portion includes two concentric circular cylinders, one large and one small, which are connected to each other, and the inner diameter of the large circular cylinder is larger than the inner diameter of the small circular cylinder. The large circular cylinder is sleeved on the first locking portion, and the small circular cylinder is sleeved on the connecting shaft, and a locking groove or locking protrusion corresponding to the locking protrusion or locking groove on the first locking portion is provided on the inner wall of the connection between the large circular cylinder and the small circular cylinder; this configuration makes the brake structure compact and avoids exposing too many interfaces to the outside.

The present invention is further configured to include an elastic member for resetting the second locking part, the elastic member is located between the second locking part and the connecting shaft, the elastic member is arranged on the connecting shaft, an inward inner protrusion is provided on the end of the second locking part close to the propulsion part, a long strip groove matching the inner protrusion is provided on the connecting shaft, the inner protrusion resists one end of the elastic member, and an elastic member block is provided on the connecting shaft to block the other end of the elastic member; when braking, when the second locking part moves in a direction close to the wheel, the spring is compressed, and when the pedaling force disappears, the spring returns to its original state and pushes the second locking part to move in a direction away from the wheel, i.e., resetting is achieved, and the setting of the inner protrusion and the groove prevents the second locking part from rotating relative to the connecting shaft, which is more convenient for limiting.

The present invention is further configured such that the elastic member is a spring, the elastic member gear is a spring gear, the spring gear includes two circular columns, one thick and one thin, the outer diameter of the thick circular column is larger than the outer diameter of the thin circular column, the thick circular column is tightly sleeved on the end of the connecting shaft, the thin circular column is located in the circular ring of the circular cylindrical first locking part, and the end of the thin circular column abuts against the wheel hub or the inner ring of the bearing at the center of the wheel; this configuration can make the spring gear abut against the inner ring of the bearing to prevent the end of the spring gear from hindering the rotation of the wheel.

A trolley comprises a frame, a front wheel and a rear wheel, wherein two rear wheels are provided, a cross piece and a connecting shaft are provided between the two rear wheels, the connecting shaft is provided at both ends of the cross piece, the connecting shaft and the wheel hub are provided with the above-mentioned brake mechanism, and the rear wheel is connected to the connecting shaft by bolts.

The present invention is further configured such that the cross section of the cross piece is in the shape of a runway, and the side of the blocking portion away from the wheel extends in a direction away from the wheel to form a mounting portion connected to the cross piece, the mounting portion is hollow, a spring clip is provided on the mounting portion, and a clip hole for the spring clip to extend out is provided on the cross piece.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a cross-sectional view of the structure of the brake mechanism of the present invention;

FIG2 is a structural disassembly diagram of the brake mechanism of the present invention;

FIG3 is a schematic structural diagram of the second locking portion in FIG1 ;

FIG4 is a schematic diagram of the structure of the spring stop in FIG1 ;

FIG5 is a schematic structural diagram of the rotating part in FIG1 ;

FIG6 is a structural schematic diagram 1 of the blocking portion, the connecting shaft, and the mounting portion in FIG1 ;

FIG7 is a second structural schematic diagram of the blocking portion, the connecting shaft, and the mounting portion in FIG1 ;

FIG8 is a schematic structural diagram of the trolley of the present invention.

In the figure: 2, second locking part; 21, locking protrusion; 22, large circular ring column; 23, small circular ring column; 3, rotating part; 31, pedal; 32, bump; 4, blocking part; 41, sliding surface; 411, transition surface; 412, inclined surface; 5, spring; 6, spring stop; 61, thin circular ring column; 62, thick circular ring column; 63, anti-rotation protrusion; 7, connecting shaft; 8, mounting part; 9, spring buckle; 11, first locking part; 111, locking groove; 12, wheel hub; 13, bearing; 14, bolt; 101, rear wheel; 102, front wheel; 103, cross piece; 104, frame.

Detailed ways

The following is a further description of an embodiment of a brake mechanism and a trolley using the brake mechanism of the present invention in conjunction with FIGS. 1 to 8 .

As shown in Figures 1 and 2, the brake mechanism includes a first locking portion 11 arranged on the wheel hub 12, a second locking portion 2 slidably sleeved on the wheel connecting shaft 7, a propulsion portion for pushing the second locking portion 2 to slide on the connecting shaft 7, and an elastic member for resetting the second locking portion 2.

The first locking portion 11 is in the shape of an annular column coaxial with the wheel, and is integrally formed with the wheel hub 12. A locking groove 111 for limiting the rotation of the wheel is provided on the end face of the annular columnar first locking portion 11, and a plurality of the locking grooves are provided, which are evenly distributed on the end face of the annular first locking portion 11.

As shown in Figure 3, the second locking part 2 includes two concentric circular ring columns, one large and one small. The inner diameter of the large circular ring column 22 is larger than the inner diameter of the small circular ring column 23. The large circular ring column 22 is sleeved on the first locking part 11, and the small circular ring column 23 is sleeved on the connecting shaft 7. A step is formed at the connection between the large circular ring column 22 and the small circular ring column 23, and a locking protrusion 21 that cooperates with the above-mentioned locking groove 111 is provided on the step.

The locking protrusion 21 may also be arranged on the first locking portion, and the locking groove 111 may be arranged on the second locking portion.

As shown in Figures 1 and 2, the elastic member is a spring 5, which is sleeved on the connecting shaft 7. The spring 5 is located between the small circular column 23 and the connecting shaft 7. An inner protrusion is provided at the end of the small circular column 23. The inner protrusion resists one end of the spring 5. A groove matching the inner protrusion is provided on the connecting shaft 7. The groove is in the shape of a long strip. When the second locking portion 2 is pushed by the propulsion portion, the inner protrusion slides in the long strip groove. A spring stop 6 is also provided at one end of the connecting shaft 7 to block the other end of the spring 5.

As shown in Figure 4, the spring stop 6 includes two circular columns, one thick and one thin. The outer diameter of the thick circular column 62 is larger than the outer diameter of the thin circular column 61. The thick circular column 62 is tightly sleeved on the end of the connecting shaft 7. The inner wall of the thick circular column 62 is provided with an anti-rotation protrusion 63 that matches the groove on the connecting shaft 7. The thin circular column 61 is located in the circular ring of the circular cylindrical first locking part 11, and the end of the thin circular column 61 is against the inner ring of the bearing 13.

As shown in Figures 1 and 2, the propulsion part includes a rotating part 3 sleeved on the connecting shaft 7, a blocking part 4 for the rotating part 3 to abut against, and a rotating pushing structure. The rotating part 3 can rotate around the connecting shaft 7, and the blocking part 4 is fixed on the connecting shaft 7; the rotating pushing structure includes a protrusion 32 arranged on the side wall of the rotating part and a sliding surface arranged on the side wall of the blocking part.

As shown in FIGS. 5 and 6 , the protrusion 32 is arranged on the side wall of the rotating part 3 and is integrally formed with the rotating part; a pedal 31 for stepping on is provided on the rotating part, and the pedal 31 is integrally formed with the rotating part; the protrusion 32 faces the blocking part 4, and a sliding surface 41 is provided on the side wall of the blocking part 4 at a position corresponding to the protrusion 32. The side wall of the rotating part 3 and the side wall of the blocking part 4 are both perpendicular to the connecting shaft 7. With the rotation of the rotating part 3, the protrusion 32 slides on the sliding surface, and the sliding surface has at least one inclined surface 412, which is inclined relative to the longitudinal section of the connecting shaft 7 so that one end of the inclined surface is closer to the wheel and the other end is away from the wheel. The longitudinal section refers to a surface perpendicular to the axis of the rotating shaft; the surface where the protrusion 32 contacts the sliding surface is a curved surface containing a section of the inclined surface 412, the middle of the sliding surface is an inclined surface, and the two ends are transition surfaces 411 that match the curved surface of the protrusion 32, and the transition surface is a curved surface; the side wall of the blocking part 4 is concave to form a slide groove, and the sliding surface forms the bottom surface of the slide groove.

Stepping on the pedal 31 makes the rotating part 3 rotate around the connecting shaft 7, and the protrusion 32 arranged on the side wall of the rotating part 3 rotates around the connecting shaft 7 along with the rotation of the rotating part 3, causing the protrusion 32 to slide on the sliding surface. Since the sliding surface has an inclined surface, when the protrusion 32 slides on the inclined surface, the inclined surface pushes the protrusion 32 to translate on the connecting shaft 7, thereby realizing the translation of the rotating part 3 on the connecting shaft 7, and then pushing the second locking part 2 close to the first locking part 11. At this time, the protrusion on the second locking part 2 sinks into the groove of the first locking part 11, which limits the rotation of the wheel.

In another embodiment, the sliding surface 41 is a smooth curved surface, which is arranged in a long strip shape, with one end close to the wheel and the other end away from the wheel; viewed from the side of the curved surface, the curved surface is similar to the middle section of a sine or cosine curve.

The sliding surface 41 gradually approaches or moves away from the first locking portion in the rotation direction of the protrusion.

As shown in Figures 1, 2, 6 and 7, the blocking portion 4 is integrally formed with the connecting shaft 7, the cross section of the cross piece 103 is in the shape of a runway, and the side of the blocking portion 4 away from the wheel extends in the direction away from the wheel to form a mounting portion 8, and the mounting portion 8 can be installed in cooperation with the cross piece arranged between the rear wheels of the child vehicle. The mounting portion 8 is hollow, and a spring buckle 9 is arranged on the mounting portion 8, and a buckle hole for the spring buckle 9 to extend out is arranged on the cross piece 103, and a nut groove for accommodating a nut is arranged at the connection between the mounting portion 8 and the blocking portion 4, and the bolt 14 passes through the bearing 13, the spring block 6, the connecting shaft 7 and the blocking portion 4 in sequence and is threadedly connected to the nut.

As shown in FIG8 , a child stroller includes a frame 104, a front wheel 102 and a rear wheel 101. Two rear wheels 101 are provided. A crosspiece 103 and a connecting shaft 7 are provided between the two rear wheels 101. The connecting shaft 7 is provided at both ends of the crosspiece 103. The above-mentioned brake mechanism is provided on the connecting shaft 7. A bearing 13 is installed in the middle of the wheel hub 12 of the above-mentioned rear wheel 101. The rear wheel 101 is connected to the connecting shaft 7 by bolts 14. The above-mentioned bolts 14 pass through the bearing 13. The above-mentioned connecting shaft 7 and the wheel hub are provided with brake mechanisms.

The following illustrates the braking principle using the projection 32 disposed on the rotating part 3. When braking is required, the pedal 31 is stepped on. At this time, the rotating part 3 rotates, and the projection 32 on the rotating part 3 slides on the sliding surface 41. Since the sliding surface 41 is inclined, the projection 32 drives the rotating part 3 to move toward the direction close to the wheel under the obstruction of the sliding surface 41. The rotating part 3 pushes the second locking part 2 to slide toward the direction close to the first locking part 11 until the locking protrusion 21 sinks into the locking groove 111. At this time, the wheel stops rotating, and braking is achieved.

The brake mechanism of the present invention is not limited to being used on a stroller, but can also be applied to other child strollers with a connecting shaft 7 between two wheels.

The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims (6)

1. A brake mechanism, characterized in that it comprises a first locking portion arranged on a wheel hub, a second locking portion slidably sleeved on the wheel connecting shaft, and a pushing portion that pushes the second locking portion to slide on the connecting shaft toward the first locking portion, the first locking portion being provided with a locking protrusion or locking groove that limits the rotation of the wheel, and the second locking portion being provided with a locking groove or locking protrusion that matches the locking protrusion or locking groove; the pushing portion comprises a rotating portion sleeved on the connecting shaft, a blocking portion for the rotating portion to abut against and fixedly connected to the connecting shaft, and a rotating pushing structure arranged between the rotating portion and the blocking portion, wherein the rotating portion is pushed toward the second locking portion when the rotating portion rotates; the rotating pushing structure comprises a convex block or sliding surface arranged on a side wall of the rotating portion and a sliding surface or convex block arranged at a corresponding position on the side wall of the blocking portion, the convex block slides on the sliding surface, the sliding surface is arranged along the rotation direction of the rotating portion, and the sliding surface intersects with a vertical plane of the axis of the connecting shaft; the first locking portion is annular columnar, and the locking protrusion or locking groove is arranged on the first annular columnar The end face of the locking part; the second locking part includes two concentric circular ring columns, one large and one small, connected to each other, the inner diameter of the large circular ring column is larger than the inner diameter of the small circular ring column, the large circular ring column is sleeved on the first locking part, and the small circular ring column is sleeved on the connecting shaft, and the inner wall of the connection between the large circular ring column and the small circular ring column is provided with a locking groove or locking protrusion corresponding to the locking protrusion or locking groove on the first locking part; it also includes an elastic member for resetting the second locking part, the elastic member is located between the second locking part and the connecting shaft, the elastic member is arranged on the connecting shaft, and the second locking part is close to the push An inward protrusion is provided at one end of the advancing portion, and a long strip groove matching the inner protrusion is provided on the connecting shaft. The inner protrusion abuts one end of the elastic member, and an elastic member stop is provided on the connecting shaft to block the other end of the elastic member; the elastic member is a spring, and the elastic member stop is a spring stop, and the spring stop includes two connected circular columns, one thick and one thin. The outer diameter of the thick circular column is larger than the outer diameter of the thin circular column. The thick circular column is tightly sleeved on the end of the connecting shaft, and the thin circular column is located in the circular ring of the circular cylindrical first locking portion, and the end of the thin circular column abuts against the inner ring of the bearing at the center of the wheel. 2. The brake mechanism according to claim 1 is characterized in that the sliding surface is an inclined surface or at least has a section of an inclined surface, the inclined surface is inclined relative to the longitudinal section of the connecting shaft, and the rotating part is provided with a pedal for stepping on. 3. The brake mechanism according to claim 2 is characterized in that the sliding surface has at least one inclined surface, the surface of the protrusion in contact with the sliding surface is a curved surface containing a section of the inclined surface, the middle of the sliding surface is an inclined surface, and the two ends are transition surfaces that cooperate with the curved surface of the protrusion. The brake mechanism according to claim 1 , wherein the sliding surface is a smooth curved surface. 5 . The brake mechanism according to claim 1 , wherein the side wall of the blocking portion or the rotating portion is concave to form a slide groove, and the sliding surface forms a bottom surface of the slide groove. 6. A trolley, comprising a frame, front wheels and rear wheels, characterized in that there are two rear wheels, a cross piece and a connecting shaft are arranged between the two rear wheels, the connecting shaft is arranged at both ends of the cross piece, the connecting shaft and the wheel hub are provided with the brake mechanism according to any one of claims 1 to 5, and the rear wheel is connected to the connecting shaft by bolts.