CN118163849A - Driving piece, braking mechanism and trolley - Google Patents

Abstract

The present disclosure provides a brake mechanism of a cart, a drive member of the brake mechanism and a cart, wherein the drive member is arranged in the brake mechanism to be movable between a locking position and a unlocking position for locking or unlocking a wheel of the cart by the brake mechanism, wherein the drive member has a guiding side provided with a guiding groove comprising a stopping groove; wherein the brake mechanism is further provided with a brake member, the stop end of which is arranged to move in the guide groove, and by moving the driving member in the locking direction to the locking position, the stop end moves in the first direction in the guide groove to the stop groove and stays at the stop groove; wherein the stop slot is provided with a buffer arranged to resiliently block the stop end from moving away from the stop slot in a second direction, wherein the second direction is opposite to the first direction. According to the present disclosure, even if a user carelessly makes a malfunction during unlocking, the driving member can return to the unlocking position to unlock the wheel.

Description

Driving piece, braking mechanism and trolley

Technical Field

The present disclosure relates to carts and, more particularly, to a brake mechanism and a drive for the brake mechanism of a cart.

Background

The cart is typically provided with a brake mechanism to lock or unlock the wheels. In order to facilitate the user to operate the braking mechanism, the braking mechanism is provided with a pedal for the user to tread. When the user depresses the pedal, the brake mechanism brakes the wheels. Generally, when a commercial cart is unlocked, there are two modes of unlocking operation, the first is that the user presses the pedal again, and the second is that the user lifts the pedal, so that the brake mechanism can unlock the wheels. However, in actual use of the first design, the user sometimes uses the instep carelessly to lift the pedal, with the result that damage to the internal structure of the brake mechanism may occur.

Disclosure of Invention

The present disclosure proposes a drive of a brake mechanism of a cart, which drive is arranged in the brake mechanism to be movable between a locking position and a unlocking position for locking or unlocking a wheel of the cart by the brake mechanism, wherein the drive has a guide side provided with a guide slot comprising a stop slot; wherein the brake mechanism is further provided with a brake member, a stop end of which is arranged to move in the guide groove, the stop end moving in the guide groove in a first direction to the stop groove and resting at the stop groove by moving the driving member in a locking direction to the locking position; wherein the detent groove is provided with a buffer arranged to resiliently block movement of the detent end away from the detent groove in a second direction, wherein the second direction is opposite to the first direction.

In one embodiment, the cushioning element has an initial state, an intermediate state, and an extended state, the cushioning element being in one of the intermediate state and the extended state with the stopping end applying force to the cushioning element, the cushioning element being in the initial state with the stopping end not applying force to the cushioning element

In one embodiment, the cushioning element is arranged such that it is in the initial undeformed state without the stopping end applying a force to the cushioning element; in the case where the stopper end moves in the second direction to contact the buffer member and apply a force to the buffer member, the buffer member enters the intermediate state where elastic deformation starts, the buffer member in the intermediate state blocking the movement of the stopper end in the second direction; in the event that the stopping end exerts a force on the cushioning member sufficient to cause the cushioning member to elastically deform to allow the stopping end to move in the second direction, the cushioning member enters the extended state of final elastic deformation, the cushioning member in the extended state allowing the stopping end to move in the second direction.

In one embodiment, the buffer is provided with a fixed section and a movable section and a contact section between the fixed section and the movable section, the contact section being provided spaced apart from an inner sidewall of the stopper groove and protruding toward an outer sidewall of the stopper groove.

In one embodiment, the inner side wall of the stop groove is formed with a fixed groove and a movable groove, the fixed section is fixed in the fixed groove, and the movable section is movably arranged in the movable groove.

In one embodiment, the movable recess is arranged to be sufficient for movement of the movable section of the cushioning member within the movable recess during deformation of the cushioning member.

In one embodiment, the fixing section is in a hook shape, and the shape of the fixing groove corresponds to the shape of the fixing section.

In one embodiment, the inner side wall of the stop groove is provided with a protrusion, which together with the contact section forms a concave shape.

In one embodiment, the guide groove comprises a first guide groove, a second guide groove and a release groove, the first guide groove and the second guide groove being in communication at one end thereof by the stop groove and at the other end thereof by the release groove, the stop end being located in the release groove with the driver in the release position.

In one embodiment, the driving member is rotatable between the locking position and the unlocking position, and the driving member is provided with an operating member for driving the driving member to rotate.

In another aspect, the present disclosure provides a brake mechanism for a cart including a drive member as described above.

In one embodiment, the braking mechanism includes a fixed seat, the fixed seat is disposed at a wheel or a frame of the cart, and the driving member is rotatably disposed on the fixed seat.

In one embodiment, the fixed end of the brake is fixed to the fixed base.

In one embodiment, the brake mechanism includes a pin axially movable in an insertion direction or in an extraction direction, the pin having a contact end and an insertion end, the driver having a drive ramp in contact with the contact end, the drive ramp being capable of pushing the pin axially movable in the insertion direction to insert the insertion end into the wheel by rotating the driver.

In one embodiment, the drive ramp is arranged to extend in the circumferential direction of the drive member and has a locking end and a release end opposite the locking end, wherein the locking end protrudes towards the insertion direction and the release end is recessed towards the withdrawal direction.

In one embodiment, the brake mechanism further comprises a resilient member arranged to urge the axle pin axially towards the withdrawal direction to withdraw the insertion end from the wheel.

In yet another aspect, the present disclosure proposes a cart equipped with a braking mechanism as described above, said braking mechanism being able to lock or release the wheels of said cart.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.

In the drawings:

Fig. 1 is a schematic view of a cart with wheels mounted with a brake mechanism.

FIG. 2 is a schematic view of an embodiment of a braking mechanism.

FIG. 3 is an exploded schematic view of an embodiment of a braking mechanism.

FIG. 4 is another angularly exploded schematic view of an embodiment of a braking mechanism.

FIG. 5 is a schematic view of an embodiment of a driver of a brake mechanism.

FIG. 6 is an assembled schematic view of an embodiment of a brake mechanism.

Fig. 7 is a schematic view of the leading side of the driving member of the brake mechanism and the brake member engaged.

Fig. 8 is a schematic view of the mating of the leading side of the driver with the bumper mounted and the brake according to the present disclosure.

Fig. 9 is an exploded view of the guide side and the bumper shown in fig. 8.

Fig. 10 is a schematic view of the detent end within the detent groove with the drive member of the detent mechanism in the locked position.

FIG. 11 is a schematic view of the detent end within the release slot with the actuator of the detent mechanism in the release position.

Fig. 12 is a schematic view of the stop end exerting a force on the bumper during a false release.

Fig. 13 is a schematic view of the stop end passing over the bumper during a false release.

List of reference numerals

1 Wheel

10 Brake mechanism

100 Driving member

101 Second shaft hole

110 Leading side

120 Guide groove

121 First guide groove

122 Second guide groove

123 Stop groove

123A outer side wall

123B inner side wall

123B1 fixing groove

123B2 active groove

123B3 protrusion

123C recess

124 Release slot

130 Cushioning member

131 Fixing section

132 Active section

133 Contact section

140 Operating member

150 Drive ramp

20 Wheel axle

200 Brake piece

210 Stop end

220 Fixed end

300 Fixing seat

301 First shaft hole

302 Pin hole

303 Fixing hole

400 Shaft pin

401 Contact terminal

402 Insertion end

500 Elastic piece

600 Reset spring

D1 locking direction

D2 unlocking direction

S1 exit direction

S2 insertion direction

T space

Detailed Description

Exemplary embodiments of a brake mechanism according to the present disclosure will be described in detail below with reference to the accompanying drawings.

It should be understood that in the following description of the embodiments, directional terms such as "upper", "lower", "upward", "downward" and the like are merely schematic descriptions with reference to the drawings, and do not limit the direction and positional relationship of the related objects or elements.

As shown in fig. 1, the cart is braked by a brake mechanism 10 mounted at the inner side of the wheel 1. It should be appreciated that the brake mechanism 10 according to the present disclosure may also be mounted at the outboard side of the wheels 1 of the cart, or on other portions of the cart frame 2 (see fig. 1) or the like.

As shown in fig. 2, the brake mechanism 10 includes a driver 100. The drive 100 is arranged in the brake mechanism 10 to be movable between a locking position and a unlocking position to lock or unlock the wheels 1 of the cart by the brake mechanism 10.

It should be appreciated that the movement of the driver 100 between the locked and unlocked positions may take various forms, such as rotational or translational. For ease of description, the rotation of the driver 100 between the locked and unlocked positions is described below as an example.

As shown in fig. 4 and 5, when the driver 100 is rotated toward the locking direction D1 to the locking position, the brake mechanism 10 locks the wheels 1 of the cart. When the driving member 100 rotates to the unlocking position in the unlocking direction D2, the brake mechanism 10 unlocks the wheels 1 of the cart.

For convenience of user operation, the driving member 100 is provided with an operating member 140 for driving the driving member to rotate. In the illustrated embodiment, the operating member 140 is a pedal for the user to pedal downward. The present disclosure is not limited thereto. The operating member 140 can also be a tap lever or other member as long as it is capable of driving the driving member 100 to rotate.

In one embodiment, the brake mechanism 10 may include a mounting 300 provided at the wheel 1 (see fig. 1) or frame 2 of the cart for carrying the drive 100, as desired for use. However, the present disclosure is not limited thereto, and the brake mechanism 10 may not include the fixing base 300, and the driving member 100 may be directly provided on the hub of the wheel 1.

Fig. 2 and 4 show an embodiment in which the driving member 100 is provided to the fixing base 300. The wheel 1 has an axle 20 at the center, the axle 20 can pass through a first axle hole 301 on the fixing base 300 and a second axle hole 101 on the driving member 100 in succession, and the driving member 100 can be rotatably disposed on the fixing base 300 around the axle 20. Of course, the present disclosure is not limited thereto, and the driving member 100 may be rotatably disposed on the fixing base 300 in other manners. For example, a rotation shaft (not shown) may be disposed on the fixing base 300, and the rotation shaft may pass through the second shaft hole 101 of the driving member 100, so that the driving member 100 may be rotatably disposed on the fixing base 300. Alternatively, a rotation shaft (not shown) may be disposed on the driving member 100, and a shaft hole may be disposed at a corresponding position of the fixing base 300, so that the driving member 100 may be rotatably disposed on the fixing base 300 by passing the rotation shaft on the driving member 100 through the shaft hole at the corresponding position of the fixing base 300.

Next, an embodiment of locking and unlocking the wheel 1 by the brake mechanism 10 according to the present disclosure will be described with reference to fig. 2 to 5. In this embodiment, the user locks the wheel 1 and unlocks the wheel 1 by operating the operating member 140 on the driving member 100 twice in different directions.

As shown in fig. 2 and 4, the brake mechanism 10 may include an axially movable pin 400. For the sake of clearer description, hereinafter, a direction in which the axle pin 400 moves toward the wheel 1 is defined as an insertion direction S2 and a direction in which the axle pin 400 moves away from the wheel 1 is defined as an extraction direction S1 with reference to the wheel 1 (see fig. 4).

The driving member 100 can drive the shaft pin 400 to move axially toward the insertion direction S2 to be inserted into the wheel 1 when rotated, thereby locking the wheel 1. Specifically, as shown in fig. 4, the axle pin 400 has a contact end 401 and an insertion end 402, and the driving member 100 has a driving inclined surface 150 (see fig. 5) in contact with the contact end 401 of the axle pin 400, and by rotating the driving member 100, the driving inclined surface 150 of the driving member 100 can push the axle pin 400 to move axially toward the insertion direction S2 (see fig. 4) to insert the insertion end 402 into the wheel 1, thereby achieving locking of the wheel 1.

In addition, the brake mechanism 10 further includes an elastic member 500, and the elastic member 500 is configured to urge the shaft pin 400 to axially move toward the withdrawal direction S1 such that the insertion end 402 thereof withdraws from the wheel 1. The elastic member 500 may be a compression spring, a tension spring, a torsion spring, an elastic band, a pneumatic/hydraulic mechanism, or other members having elastic restoring force. In other embodiments, the brake mechanism 10 according to the present disclosure may not include the elastic member 500, but may include a driving member (not shown) exposed outside the brake mechanism 10, through which the user drives the shaft pin 400 to move axially toward the withdrawal direction S1 to withdraw the insertion end 402 thereof from the wheel 1.

As shown in fig. 4 and 5, the driving ramp 150 is provided to extend in the circumferential direction of the driving member 100, and has a locking end 151 and a releasing end 152 opposite to the locking end 151, wherein the locking end 151 protrudes toward the insertion direction S2, and the releasing end 152 is recessed toward the withdrawal direction S1.

When the user is ready to lock the wheel 1, he can operate the operating member 140 on the driving member 100 to rotate the driving member 100 toward the locking direction D1. Thus, the drive inclined surface 150 on the driver 100 moves circumferentially in the locking direction D1 with respect to the shaft pin 400, and when the drive inclined surface moves until the locking end 151 contacts the shaft pin 400, the locking end 151 projects in the insertion direction S2, so that the locking end 151 pushes the shaft pin 400 to move axially in the insertion direction S2 to insert the insertion end 402 into the wheel 1.

When the user is ready to unlock the wheel 1, he can operate the operating member 140 on the driving member 100 to rotate the driving member 100 in the unlocking direction D2. Thus, the driving ramp 150 on the driving member 100 moves circumferentially relative to the axle pin 400 in the unlocking direction D2, and when moved until the unlocking end 152 contacts the axle pin 400, since the unlocking end 152 is recessed in the withdrawing direction S1, it allows the axle pin 400 to move axially in the withdrawing direction S1, so that the elastic member 500 can drive the axle pin 400 to move axially in the withdrawing direction S1 to withdraw the insertion end 402 thereof from the wheel.

Fig. 4 shows an arrangement of the pin 400. As shown in fig. 4, the fixing base 300 is provided with a pin hole 302 for the pin 400 to movably pass through. Of course, the present disclosure is not limited thereto, and the shaft pin 400 may be movably disposed to the fixing base 300 in other manners. For example, a moving slot (not shown) may be disposed on the fixing base 300 for the shaft pin 400 to movably pass therethrough.

Of course, the present disclosure is not limited thereto, and the brake mechanism 10 may take other embodiments to lock the wheel 1. For example, the driving member 100 may be coupled to the shaft pin 400 by a traction member (not shown) such that the driving member 100 moves the shaft pin 400 axially via the traction member when rotated. For another example, the braking mechanism 10 may take the form of a braking member other than the axle pin 400, to which the driver 100 is connected by a traction member (not shown), such that the driver 100, when rotated, moves the braking member via the traction member to lock the wheel 1. For another example, a brake lever (not shown) extending parallel to the wheel axle 20 is provided on the driving member 100, and a plurality of brake grooves (not shown) arranged in the circumferential direction are provided at the hub of the wheel 1. When the driving member 100 is rotated in the unlocking direction to the unlocking position, the brake lever is engaged into the brake groove of the wheel 1 as the driving member 100 rotates together, thereby locking the wheel 1.

In order to achieve that the user locks the wheel 1 and unlocks the wheel 1 by operating the operating member 140 on the driving member 100 twice in the same direction, a guiding side 110 may be provided on the driving member 100. It should be appreciated that although in the embodiment shown in fig. 6 and 7, the guide side 110 is disposed on the opposite side of the driving member 100 from the driving ramp 150, the present disclosure is not limited thereto, and the guide side 110 may be disposed on the same side of the driving member 100 as the driving ramp 150.

As shown in fig. 6 and 7, the guide side 110 of the driving member 100 is provided with a guide groove 120. The guide groove 120 includes a stopper groove 123. In one embodiment, the guide groove 120 may further include a first guide groove 121, a second guide groove 122, and a release groove 124. The first guide groove 121 communicates with the second guide groove 122 at one end thereof through the stopper groove 123 and at the other end thereof through the release groove 124, so that the guide groove 120 is annular (see fig. 7).

In addition, the brake mechanism 10 is also provided with a brake 200. The brake 200 may be a rod-shaped clip spring as shown in fig. 4, or may be a member having another shape. The stopper 200 has a stopper end 210 and a fixing end 220, wherein the stopper end 210 is provided to be movable in the guide groove 120, and the fixing end 220 may be fixed to the fixing hole 303 of the fixing base 300. Of course, the present disclosure is not limited thereto, and the fixed end 220 may be fixed to the fixing base 300 or the hub of the wheel 1 in other suitable manners.

When the driver 100 is in the locked position, the stop end 210 is located in the stop slot 123. When the driver 100 is in the release position, the stop end 210 is positioned in the release slot 124. Of course, the present disclosure is not limited thereto, and the guide groove 120 may not be provided with the release groove 124, but ends of the first and second guide grooves 121 and 122 remote from the stopper groove 123 may be directly connected together.

Next, the operation principle of the driving member 100 will be described in detail. For convenience of description, referring to fig. 7, a direction in which the stopping end 210 of the stopper 200 moves sequentially through the release groove 124, the first guide groove 121, the stopping groove 123, and the second guide groove 122 in the guide groove is defined as a first direction, and a direction opposite to the first direction is defined as a second direction.

When the wheel 1 is to be locked, the user performs a first operation on the operation member 140 of the driving member 100, applies a downward force, for example, depresses the pedal with a foot, so that the driving member 100 is rotated to the locking position toward the locking direction D1, whereupon the stopper end 210 of the stopper 200 is moved from the lock release groove 124 to the stopper groove 123 via the first guide groove 121 in the first direction, and abuts against the outer side wall 123a of the stopper groove 123, so that the driving member 100 cannot continue to rotate toward the locking direction D1.

When the user no longer applies a downward force to the operating member 140 of the driving member 100, the driving member 100 rotates toward the unlocking direction D2 under the elastic force of the return spring 600 (see fig. 4), and then the stopping end 210 moves away from the outer sidewall 123a of the stopping groove 123 and then hooks the inner sidewall 123b of the stopping groove 123, so that the driving member 100 cannot continue to rotate toward the unlocking direction D2. Thus, as shown in fig. 6, the stopper end 210 finally stays in the stopper groove 123, and the driver 100 is maintained in the locking position. At this time, the wheel 1 is locked. Since the stroke of the driving member 100 rotating in the unlocking direction D2 is very short in this process, the brake mechanism 10 can keep locking the wheel 1.

When the wheel 1 is ready to be unlocked, the user operates the operating member 140 of the driver 100 in the same direction a second time, applies downward force again, for example, presses the pedal again with his foot, so that the driver 100 rotates again in the locking direction D1, and the stopper end 210 moves away from the inner side wall 123b of the stopper groove 123 to reach the outer side wall 123a. As the driver 100 continues to rotate toward the locking direction D1, the stopper end 210 moves toward the second guide groove 122 in the first direction in the stopper groove 123 until the stopper end 210 moves to the second guide groove 122 and abuts against an end wall of the second guide groove 122 where the second guide groove 122 is connected to the stopper groove 123, so that the driver 100 cannot continue to rotate toward the locking direction D1. In this process, the stroke of the rotation of the driving member 100 in the locking direction D1 is also very short, and thus the brake mechanism 10 still keeps locking the wheel 1.

When the user no longer applies a downward force to the operating member 140 of the driving member 100, the driving member 140 rotates toward the unlocking direction D2 under the elastic force of the return spring 600, and thus the stopper end 210 moves from the second guide groove 122 to the unlocking groove 124 in the first direction, and the driving member 100 returns to the unlocking position as shown in fig. 7. Thereby, the user causes the wheel 1 to be unlocked by operating the operating member 140 on the driving member 100 for the second time in the same direction.

However, in actual use, when the user prepares to unlock the wheel 1, sometimes an erroneous operation occurs, and carelessly applies an upward force to the operating member 140 of the driving member 100, for example, the pedal is lifted using the foot surface, which causes the driving member 100 to tend to rotate toward the unlocking direction D2, causing the stopper end 210 to tend to move in the second direction, but since the stopper end 210 catches the recess 123c (see fig. 7) on the inner side wall 123b and does not smoothly move from the stopper groove 123 to the first guide groove 121 in the second direction, this causes the operating member (for example, the pedal) 140 to be unable to move upward, and as a result, the user may operate with a larger force, such that the stopper end 210 can move further to the first guide groove 121 in the second direction against the blocking force of the recess 123c, which may cause damage to the internal structure of the brake mechanism, for example, deformation of the brake member 200, or breakage of the operating member (for example, pedal) 140, or the like.

To avoid this, as shown in fig. 8 and 9, the driving member 100 according to the present disclosure is provided with a buffer member 130, which buffer member 130 is arranged to elastically block the stopper end 210 from moving away from the stopper groove 123 in the second direction.

Herein, "elastically blocking" means that when the stopper 210 applies insufficient force to the buffer member 130 to deform the buffer member 130 to a degree that allows the stopper 210 to pass, the buffer member 130 will block the stopper 210 from moving from the stopper groove 123 to the first guide groove 121 in the second direction; when the force applied by the stopping end 210 to the buffer member 130 deforms the buffer member 130 to an extent that allows the stopping end 210 to pass, the buffer member 130 will allow the stopping end 210 to move from the stopping groove 123 to the first guide groove 121 in the second direction. Specifically, when the stopper end 210 does not apply a force to the buffer 130, the buffer 130 is in an initial state, i.e., an undeformed state; when the driving member 100 rotates toward the releasing direction D2, causing the stopper end 210 to move in the second direction to contact the buffer member 130 and apply a small force to the buffer member 130, the buffer member 130 enters an intermediate state, i.e., a state of starting elastic deformation, in which the deformation of the buffer member 130 is small to be able to block the stopper end 210 from moving in the second direction; when the stopper end 210 is further moved in the second direction to apply a large force to the buffer member 130 such that the buffer member 130 is elastically deformed to an extent that allows the stopper end 210 to move in the second direction, the buffer member 130 enters an extended state, i.e., a final elastically deformed state, in which the buffer member 130 allows the stopper end 210 to move in the second direction.

In one embodiment shown in fig. 9, the buffer 130 takes the form of a spring piece disposed on the inner sidewall 123b of the stopper groove 123. Of course, the present disclosure is not limited thereto, and the buffer 130 may take other forms of elastic members as long as it can achieve the effect of elastically blocking the stopper 210.

As shown in fig. 9, the buffer 130 is provided to have a fixed section 131 and a movable section 132, and a contact section 133 between the fixed section 131 and the movable section 132. As shown in fig. 10 and 11, the contact section 133 is provided to be spaced apart from the inner sidewall 123b of the stopping groove 123 by a space T having an initial size and protrude toward the outer sidewall 123a, so that the stopping end 210 can be elastically stopped from moving from the stopping groove 123 to the first guide groove 121 in the second direction.

Accordingly, as shown in fig. 9, the inner sidewall 123b of the stopper groove 123 is formed with a fixing groove 123b1 in which the fixing section 131 of the buffer member 130 is fixed and a movable groove 123b2 in which the movable section 132 of the buffer member 130 is movably disposed.

In the embodiment shown in fig. 9, the fixing segment 131 has a hook shape, and the shape of the fixing groove 123b1 corresponds to the shape of the fixing segment 131. Of course, the present disclosure is not limited thereto, and the fixing segment 131 and the fixing groove 123b1 may take other shapes such as an L shape or a wave shape, as long as the fixing segment 131 can be fixed in the fixing groove 123b 1.

The movable groove 123b2 on the inner sidewall 123b of the stopping groove 123 is configured such that the space in the movable groove 123b2 is sufficient for the movable section 132 of the buffer member 130 to move in the movable groove 123b2 during the deformation of the buffer member 130 into the intermediate state and the extended state. For example, the space of the movable groove 123b2 may be set deeper and/or wider to avoid restricting the movement of the movable section 132 of the buffer member 130 therein, thereby ensuring that the buffer member 130 can be deformed.

Of course, the buffer 130 according to the present disclosure is not limited thereto, and the buffer 130 may take other arrangements. For example, the buffer member 130 may take the form of a straight elastic sheet, one end of which is fixed in the inner sidewall 123b of the stopping groove 123, and the other end of which is exposed outside the inner sidewall 123b of the stopping groove 123 and may be bent and deformed to elastically block the stopping end 210 from moving from the stopping groove 123 to the first guide groove 121 in the second direction.

In one embodiment, as shown in fig. 8, 9 and 10, the inner sidewall 123b of the stopping groove 123 may be provided with a protrusion 123b3. The projection 123b3 cooperates with the contact segment 133 to form a recess for better positioning of the stop end 210 therein.

The driving member 100 provided with the buffer member 130 according to the present disclosure operates in substantially the same manner as the driving member not provided with the buffer member 130 before, and two release processes of the driving member 100 provided with the buffer member 130 will be mainly described in detail below.

Fig. 10 shows the stop end 210 abutting against the contact section 133 and the inner side wall 123b of the shock absorber 130 when the driver 100 is in the locked position (i.e., the wheel 1 is in the locked state). At this time, the force applied by the stopping end 210 to the buffer member 130 is zero or less, the buffer member 130 is in an initial state or an intermediate state, and the buffer member 130 has not been deformed to an extent that allows the stopping end 210 to pass through, so that the contact section 133 of the buffer member 130 is still spaced apart from the inner sidewall 123b of the stopping groove 123 by a certain space T, and the buffer member 130 blocks the stopping end 210 from moving from the stopping groove 123 to the first guide groove 121 in the second direction.

During a normal unlocking process (first unlocking process), the user performs a second operation of the operating member 140 of the driving member 100 in the same direction, applies downward force again, for example, presses the pedal again, so that the driving member 100 rotates again in the locking direction D1, and the stopper end 210 moves away from the contact section 133 and the inner side wall 123b of the buffer member 130 to the outer side wall 123a, see fig. 10. As the driver 100 continues to rotate toward the locking direction D1, the stopping end 210 moves along the stopping groove 123 toward the second guiding groove 122 in the first direction until the stopping end 210 moves to the second guiding groove 122 and abuts against an end wall of the second guiding groove 122 where the second guiding groove 122 is connected to the stopping groove 123, such that the driver 100 cannot continue to rotate toward the locking direction D1. In this process, the stroke of the rotation of the driving member 100 in the locking direction D1 is also very short, and thus the brake mechanism 10 still keeps locking the wheel 1.

When the user no longer applies a downward force to the operating member 140 of the driving member 100, the driving member 140 rotates toward the unlocking direction D2 by the elastic force of the return spring 600, and thus the stopper end 210 moves from the second guide groove 122 to the unlocking groove 124 in the first direction, as shown in fig. 11, and the driving member 100 returns to the unlocking position. Thereby, the wheel 1 is unlocked.

On the other hand, in the unlocking process of the erroneous operation (second unlocking process), the user carelessly applies an upward force to the operating member 140 of the driving member 100, for example, uses the foot surface to lift the pedal, so that the driving member 100 rotates in the unlocking direction D2, and the stopper end 210 moves from the stopper groove 123 toward the first guide groove 121 in the second direction, and thus the stopper end 210 applies a larger force to the buffer member 130.

When the large force deforms the buffer member 130 to such an extent that the stopper end 210 is allowed to pass, the buffer member 130 enters the extended state, the movable section 132 of the buffer member 130 goes deeper into the movable groove 123b2 of the inner side wall 123b, and the angle between the movable section 132 and the fixed section 131 of the buffer member 130 becomes larger, so that the contact section 133 of the buffer member 130 moves toward the inner side wall 123b of the stopper groove 123, so that the space T therebetween becomes smaller (see fig. 12), even the space T no longer exists (i.e., the contact section 133 of the buffer member 130 comes into abutment with the inner side wall 123b of the stopper groove 123), with the result that the contact section 133 of the buffer member 130 no longer blocks the stopper end 210, and the stopper end 210 can move from the stopper groove 123 to the first guide groove 121 in the second direction, as shown in fig. 13.

After the stopping end 210 passes over the contact section 133 of the buffer member 130, the buffer member 130 will elastically return to the original state, so that the movable section 132 of the buffer member 130 withdraws from the movable recess 123b2 of the inner sidewall 123b, the included angle between the movable section 132 and the fixed section 131 of the buffer member 130 becomes smaller, and the space T between the contact section 133 of the buffer member 130 and the inner sidewall 123b of the stopping groove 123 returns to the original size.

Subsequently, the driving member 100 may be rotated in the unlocking direction D2 by the same (upward) force applied to the operating member 140 by the user or by the elastic force of the return spring 600, and thus the stopper end 210 is moved from the first guide groove 121 to the unlocking groove 124 in the second direction, as shown in fig. 11, and the driving member 100 is returned to the unlocking position. Thereby, the wheel 1 is unlocked.

By providing the shock absorber 130 on the driving member 100, even if a user carelessly makes a mistake in unlocking (for example, lifts the pedal with the foot surface), the driving member 100 can return to the unlocking position and the wheel 1 can be unlocked. This not only increases the flexibility of use of the brake mechanism, so that the user can either depress the pedal again to unlock the wheel 1, or lift the pedal with the foot surface to unlock the wheel 1. In addition, the damage of the internal structure of the braking mechanism caused by misoperation is avoided, and the stability and the service life of the braking mechanism are improved.

As the features of the present disclosure may be embodied in several forms without departing from the characteristics thereof, it should also be understood that the above-described embodiments are not limited to any of the details of the foregoing description, unless otherwise specified, but rather should be construed broadly within its scope as defined in the appended claims, and therefore all changes and modifications that fall within the metes and bounds of the claims, or equivalents of such metes and bounds are therefore intended to be embraced by the appended claims.

Claims (17)

1. A drive member of a brake mechanism of a cart, said drive member being arranged in said brake mechanism to be movable between a locked position and a unlocked position to lock or unlock wheels of said cart by said brake mechanism,

Wherein the driving piece is provided with a guide side surface, the guide side surface is provided with a guide groove, and the guide groove comprises a stop groove;

Wherein the brake mechanism is further provided with a brake member, a stop end of which is arranged to move in the guide groove, the stop end moving in the guide groove in a first direction to the stop groove and resting at the stop groove by moving the driving member in a locking direction to the locking position;

Wherein the detent groove is provided with a buffer arranged to resiliently block movement of the detent end away from the detent groove in a second direction, wherein the second direction is opposite to the first direction.

2. The driver of claim 1, wherein the bumper has an initial state, an intermediate state, and an extended state, the bumper being in one of the intermediate state and the extended state with the stopping end applying a force to the bumper, the bumper being in the initial state with the stopping end not applying a force to the bumper.

3. The driver of claim 2, wherein the bumper is in the initial undeformed state without the stopping end applying a force to the bumper; in the case where the stopper end moves in the second direction to contact the buffer member and apply a force to the buffer member, the buffer member enters the intermediate state where elastic deformation starts, the buffer member in the intermediate state blocking the movement of the stopper end in the second direction; in the event that the stopping end exerts a force on the cushioning member sufficient to cause the cushioning member to elastically deform to allow the stopping end to move in the second direction, the cushioning member enters the extended state of final elastic deformation, the cushioning member in the extended state allowing the stopping end to move in the second direction.

4. A drive according to any one of claims 1 to 3, wherein the buffer is provided with a fixed section and a movable section and a contact section between the fixed section and the movable section, the contact section being provided spaced apart from an inner side wall of the stopper groove and protruding toward an outer side wall of the stopper groove.

5. The driving piece as claimed in claim 4, wherein the inner sidewall of the stopping groove is formed with a fixed groove in which the fixed section is fixed and a movable groove in which the movable section is movably disposed.

6. The driving member according to claim 5, wherein the movable recess is configured to be sufficient for movement of the movable section of the cushioning member within the movable recess during deformation of the cushioning member.

7. The driving member according to claim 5, wherein the fixing section is in the shape of a hook, and the fixing groove has a shape corresponding to the shape of the fixing section.

8. The driver of claim 4, wherein an inner sidewall of the detent groove) is provided with a protrusion that cooperates with the contact section to form a concave shape.

9. A driver according to any one of claims 1 to 3, wherein the guide slots comprise a first guide slot, a second guide slot and a release slot, the first guide slot and the second guide slot being in communication at one end thereof by the detent slot and at the other end thereof by the release slot, the detent end being located in the release slot with the driver in the release position.

10. A drive member according to any one of claims 1 to 3 wherein the movement of the drive member between the locked and unlocked positions is rotational and wherein the drive member is provided with an operating member for urging rotation thereof.

11. A brake mechanism for a stroller comprising a drive according to any one of claims 1 to 10.

12. The brake mechanism of claim 11, wherein the brake mechanism includes a fixed seat disposed at a wheel or a frame of the cart, the drive member being rotatably disposed at the fixed seat.

13. The brake mechanism of claim 12 wherein the fixed end of the brake member is secured to the anchor mount.

14. The brake mechanism of claim 12, wherein the brake mechanism includes a pin axially movable in an insertion direction or in an extraction direction, the pin having a contact end and an insertion end, the driver having a drive ramp in contact with the contact end, the drive ramp being capable of pushing the pin axially movable in the insertion direction to insert the insertion end into the wheel by rotating the driver.

15. The brake mechanism of claim 14, wherein the drive ramp is configured to extend in a circumferential direction of the drive member and has a locking end and a release end opposite the locking end, wherein the locking end protrudes toward the insertion direction and the release end is recessed toward the withdrawal direction.

16. The brake mechanism of claim 14, further comprising a resilient member configured to urge the axle pin axially toward the withdrawal direction to withdraw the insertion end from the wheel.

17. A trolley fitted with a braking mechanism as claimed in any one of claims 11 to 16, which is capable of locking or unlocking the wheels of the trolley.