JPH0867255A - Brake device for handcart - Google Patents

Abstract

PURPOSE: To apply a brake to a running handcart such as a baby carriage or the like and to perform an operation for this brake easily at hand further even during running. CONSTITUTION: In a brake device for a handcart, a brake means 5, having a brake member 9 coming into contact with a wheel 8 to apply a brake to rotating the wheel 8, is provided in the vicinity of the wheel 8, also to provide a brake operating part 3, operating a wire 7 pulled for operating this brake means 5 switched, in the vicinity of a push handle 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake device for a handcart that applies braking to the traveling of various handcarts such as strollers, shopping cars, luggage carriers, wheelchairs and the like.

[0002]

2. Description of the Related Art A handcart does not have the above-described brake device, but a similar device is merely provided with a stopper device that prevents the wheels from rotating when the vehicle is stopped.

This stopper device is provided for each wheel, and its operation is only to bend the body and operate the operation lever by hand, or to operate it with the tip of the foot. However, it is troublesome to bend the body and operate it, and it is a great burden on pregnant women and old people. In addition, even if it is operated with the tip of the foot, it cannot be quickly performed depending on the footwear and dexterity, and this cannot be solved only by devising the shape of the operation lever and the operation direction.

Moreover, this stopper device is one of two things, whether the wheel is rotated or not, and since the switching operation cannot be performed during traveling, it can be a braking device for imparting braking to traveling as described above. Absent. If there is a braking device, it is inevitable that the speed can be controlled and safety is improved, for example, when going down a slope.

[0005]

SUMMARY OF THE INVENTION Therefore, the present invention
An object of the present invention is to provide a brake device for a wheelbarrow that can provide a wheelbarrow with good usability by providing a wheel with a braking means and allowing the wheel to be operated at hand.

[0006]

That is, the means for solving the above-mentioned problems will be described with reference to FIG. 1 showing an embodiment, and the structure thereof is provided with a brake means 5 for applying a brake to the rotation of the wheel 8. At the same time, the operation unit 3 for switching the braking means 5 is a brake device for a handcart provided near the push handle 2.

Specifically, for example, the operation portion 2 is rotatably supported by the pusher handle 2, a brake lever 22 for rotating the rotation support member, and pulled by the rotation of the rotation support member. The wire 7 and the engagement / disengagement means 26 for engaging / disengaging the rotation support member to the wire pulling position.

In order to give a variety of operations, one end of the rotation supporting member is provided with an elastic locking claw, and the rotation supporting member is rotatably accommodated in a case. A lock portion that engages with a part in the width direction to hold the rotation support member at the wire pulling position is formed, and a slider that slides with the cam portion housed in the case is provided on the outer peripheral surface of the case. At the same time, a release surface is provided on the cam portion for retracting the locking claw engaged with the locking portion in the non-locking direction, and is engaged with the locking portion when the slider is set at a predetermined position on the rotation support member side. It is also possible to form a locking prevention surface that makes the locking claw to be retracted into a non-lockable state.

Further, in order to improve the operability, the brake lever may be formed in a gate shape which is installed between the pusher handles.

[0010]

That is, according to the above-mentioned structure, the operation of the brake means is performed by the operation portion near the pusher handle on which the user of the handcart is holding his hand while the vehicle is stopped or running.

In the case where the slider is provided in the case that rotatably accommodates the rotation supporting member, when the slider is positioned on the side opposite to the rotation supporting member and the brake lever is pulled to rotate the rotation supporting member, the brake is released. At the same time, when the locking claw of the rotation support member is engaged with the locking portion of the case, the wheel is in a state of being unable to rotate. To release this, slide the slider toward the rotation support member. That is, the release surface of the cam portion comes into contact with a part of the engaging claws, and the engaging claws are retracted by the material elasticity to release the engagement.

However, in the state where the slider is set in advance to the rotation supporting member side, even if the brake lever is pulled to rotate the rotation supporting member to the engagement position, the engagement preventing surface of the cam of the slider prevents the engagement. The pawl cannot engage the locking portion, and when the hand is released from the brake lever, the brake lever immediately returns to its original state, which is a brake-free state.

Further, when the brake lever of the operating portion is formed in a gate shape and is installed between the pusher handles, the right or left hand of the hand holding the pusher handle can be operated.

[0014]

As a result of the above, according to the brake device for a handcart of claim 1, since the braking means can be operated at hand, braking of the handcart can be applied easily and quickly. . Moreover, it is possible not only when the vehicle is stopped but also when the vehicle is running.

Further, according to the brake device for a handcart of claim 2, in addition to the above-mentioned effects, since the operating portion is constituted by the rotation supporting member, the brake lever, the wire, and the engaging / disengaging means, the link mechanism is used. The number of parts is small and the structure is simple as compared with the case of configuring.

According to the brake device for a handcart according to claim 3, since the brake-free state in which the brake lever is not maintained and the braked state is not maintained immediately after the operation of the brake lever, the variation of the operation is increased,
The usage mode is increased, and various uses according to the type of the wheelbarrow are possible.

According to the brake device for a handcart of claim 4, since the brake lever is formed in a gate shape and is installed between the pusher handles, the brake lever can be operated from the right or left of the pusher handle, from anywhere, and in an emergency. It is convenient for time operation. Also, when operating the brake lever,
For example, the thumb side of the hand may be hooked on the push handle, and the other finger side may be hooked on the brake lever, so that the operation is extremely easy and a large force is not required.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. 1 is a right side view of the frame 1 of the wheelbarrow, FIG.
Is a left side view, and as shown in this figure, the pusher handle 2 of the handcart is provided with operating portions 3 and 4, and the operating portions 3 and 4 are provided.
Thus, the brake means 5 for the rear wheels and the swing lock means 6 for the front wheels can be operated.

As shown in FIG. 3, the operating portions 3 and 4 are composed of a brake operating portion 3 and a swing lock operating portion 4, and each operating portion 3 and 4 pulls a wire 7, and the above-mentioned braking means 5 is used. The swing lock means 6 and the swing lock means 6 are configured as follows, for example.

The braking means 5 shown in FIG. 4 has a braking member 9 in which a contact piece 9a contacting the wheel 8 is projected outward.
Is pivotally attached to the leg 10 on the rear side of the frame 1 and the wire 7 is pulled to bring the above-mentioned contact piece 9a into contact with the wheel 8 to apply braking to the wheel 8.

More specifically, the braking member 9 is the contact piece 9
a and 9a are projected on both ends, and these are attached to both ends of
9b and the intermediate connecting piece 9c are connected by a U-shaped connecting portion. That is, an intermediate portion of the pivoting pieces 9b, 9b forming a right angle with the contact pieces 9a, 9a is set as a pivoting point 9d on the leg 10 on the rear side, and one end of a connecting piece 9c for connecting the pivoting pieces 9d to each other. The lower end of the wire 7 is fixed to the (right side of the drawing) with a bolt 11 and a nut 12. And the pivot piece 9b
The contact piece 9a, between the pivot point 9d of the
Spring 13 for urging 9a in the direction of moving away from wheels 8,8
Is installed. In the figure, numeral 14 is a wire fitting, and numeral 15 is a return spring.

The swing lock means 6 may be constructed as shown in FIG. 5, for example. That is, the lock lever 17 is pivotally attached to the lower end of the left leg 16 on the front side of the frame 1 and the wire 7 is pulled to lock the locking claw 17a of the lock lever 17.
Is to be disengaged from the locking groove 18a of the caster body 18 on the left side. When the pulling of the wire 7 is released and the wheels 19 and the caster body 18 are oriented straight, the lock lever 17 is rotated by the urging force of the return spring 20, and the locking claw 17a at the tip of the lock groove 17a of the caster body 18 moves. 1
It is set to engage with 8a. The left and right caster main bodies 18 are connected to each other by a connecting rod 21 so that they can be swung freely, and if one left caster main body 18 is swing-locked, the caster main bodies 18 are also transmitted to the right side.

As shown in FIG. 6, the above-mentioned brake operating portion 3 includes a brake lever 22 rotatably installed between the pusher handles 2, and a rotation support member 23 rotated by the brake lever 22. This rotation support member 23
Case 25 that houses the wire 7 pulled by the rotation of
a and 25b (see FIG. 3) and a slider 26 that slides on the outer peripheral surfaces of the cases 25a and 25b.

The rotation support member 23 is made of synthetic resin and has an insertion hole 27 through which the shaft 24 is inserted, and the end of the brake lever 22 is inserted and fixed above the insertion hole 27. While forming the portion 28, a locking hole portion 29 for locking the cylindrical locking member 7a at the upper end of the wire 7 is formed below the portion 28. In addition, the fixed portion 2 described above
An elastically deformable locking piece 30 is extended above 8 so as to extend along the rotation direction. The locking claw 30a at the tip of the locking piece 30 has a hook shape having an inclined surface at the tip.

The distance between the horizontal bar of the brake lever 22 and the pusher handle 2 is set so that when the thumb side is hooked on the pusher handle 2, the other finger side can be hooked on the brake lever 22. .

The cases 25a and 25b described above are also made of synthetic resin and have a circular cross section. Further, as shown in FIG. 7, a case body 25a and a cap member 25b are provided, and a rotation groove 31 for rotating the brake lever 22 and a slide groove 32 for sliding the slider 26 are provided on the peripheral surface. There is. In addition, as shown in FIG.
At a predetermined position on the inner peripheral surface of a, the above-mentioned rotation support member 23
The engaging portion 33 is formed so as to engage with a part of the engaging claw 30a in the width direction. In order to fix the cases 25a and 25b to the pusher handle 2, the retaining claws 34a and 34a of the grip portion 34 integrally formed inside the case body 25a (see FIG. 7).
Fixed portion 3 formed at a predetermined position of the pusher handle 2.
Fix at 5. The case body 25a may be integrally molded.

The slider 26 is composed of the cases 25a, 2
A main body 36, which is arcuate in side view and slides on the outer peripheral surface of 5b
And a cam portion 37 continuously provided on the inner surface of the main body 36 with a width corresponding to the thickness of the cases 25a and 25b. The cam portion 37 has a release surface 37a that is inclined similarly to the inclined surface of the locking portion 33 of the case body 25a described above,
It has the locking prevention surface 37b which does not incline. That is, the release surface 37a is brought into contact with a part of the locking claw 30a engaged with the locking portion 33, and the locking claw 30a is abutted.
Is to be retracted based on its elasticity to release the engagement with the locking portion 33 (see FIG. 12).
When the slider 26 is positioned in the direction of the rotation support member 23 and aligned with the engaging portion 33, the engaging portion 7b retracts the engaging claw 30a that tries to engage with the engaging portion 33, and engages with the engaging portion 33. It is intended to prevent this (see FIG. 13).

The slider 26 can be set to two slide positions by an L-shaped locking projection 38 formed integrally between the main body 36 and the cam portion 37 shown in FIG. . The two positions are the brake release / free positions where the slider 26 can be slid toward the rotation support member 23 and the front portion having the release surface 37a can be aligned with the locking portion 33 of the case body 25a. One is
The locking claw 30a of the rotation support member 23 is a stop position where the locking projection 33 can be engaged with the locking portion 33, and the locking projection 38 is locked at a position where the locking projection 38 is located at each time. The stop recess 39 and the second locking recess 40 are connected to the case body 25.
It is formed in a.

As shown in FIG. 9, the above-described swinging lock operating portion 4 includes a lever member 41 which is rotated to two positions, and a wire 7 which is pulled by one rotation of the lever member 41.
A brake lever holding member 42 that rotatably holds the other end of the brake lever 22 described above, and a case 43 that houses the brake lever holding member 42 and the lever member 41.
a, 43b.

The above-mentioned lever member 41 is made of synthetic resin,
An operation piece 44 projecting outward from the cases 43a and 43b is formed at the rear end, and a rotation restricting step portion 46, a cam portion 47, and a wire locking portion 48 are provided via the neck portion 45 ahead of this. Is forming.

That is, as shown in FIG.
The tip is formed wider, and the upper surface is formed into a concave shape. The rear end of the rotation restricting stepped portion 46 is the case 43.
The lever member 41 can be smoothly rotated by contacting the inner peripheral surfaces of a and 43b.

The cam portion 47 is set wider, and a contact surface 47a inclined at a predetermined angle is formed on the rear side. The contact surface 47a contacts the step portion 43c formed on the cases 43a and 43b, and the rotation restricting step portion 46 described above.
The wire 7 can be pulled by engaging with the locking projection 43d formed on the cases 43a and 43b and setting the stable posture as shown by a virtual line in FIG. Further, the cam portion 47 is formed higher than the other portions, and elongated holes 47b, 47b inclined at a predetermined angle are formed on both walls facing each other so that the shaft 49 can be inserted therethrough.

The wire locking portion 48 has an end portion of the bottom surface set in an arc shape, and the wire insertion hole 4 for inserting a wire into the bottom surface.
8a is formed so that the cylindrical locking member 7a can be locked.

The brake lever holding member 42 described above has a through hole 50 through which a shaft 49 for allowing the brake lever holding member 42 to rotate is inserted.
The brake lever 2 is formed on the upper side of the insertion hole 50.
A fixing portion 51 for inserting and fixing the two end portions is formed.

The above-mentioned cases 43a and 43b are made of synthetic resin and have a turning groove 52 for turning the brake lever 22.
And a turning groove 53 for turning the lever member 41 at a predetermined position respectively, and like the case 25a, 25b of the brake operating portion 3 described above, the case main body 43
It is composed of a and a cap member 43b. The above-described storage of the brake lever holding member 42 and the lever member 41 is performed in parallel, and the brake lever holding member 42 is stored.
The turning force of is not transmitted to the lever member 41. Further, the cases 43a and 43b are fixed to the pusher handle 2 by fixing the cases 25a and 2 of the brake operating portion 3 described above.
It is similar to the case of 5b.

Next, the operation and effect of the thus constituted wheelbarrow will be described below. When it is desired to apply braking to the traveling of the handcart or to lock the swing of the front wheels, the operation units 3 near the pusher handle 2 on which the handcart user holds his hand, regardless of whether the car is stopped or traveling. Four
To do.

That is, when it is desired to keep the hand cart in a traveling-disabled state, for example, when the hand truck must be separated from the hand cart, the slider 26 of the brake operating section 3 is set to the stop position, and then the brake lever 22 is set. To the limit and rotate. Then, as shown in FIG. 11, as the rotation support member 23 rotates, the wire 7
The locking member 7a at the upper end is pulled, the wire 7 is pulled, and the locking claw 3 of the locking piece 30 of the rotation support member 23 is pulled.
0a engages with the locking portion 33 formed on the case body 25a, and the engagement is maintained. When the wire 7 is pulled, the contact pieces 9a, 9a of the braking member 9 are moved to the wheels 8, 8
The wheels 8 and 8 cannot rotate due to frictional resistance.

In order to release this, as shown in FIG. 12, the slider 26 is slid to the rotation support member side to set the brake release / free position. Then, the release surface 37a of the cam portion 37 comes into contact with a part of the engaging claw 30a, and specifically, the release surface 37a of the engaging claw 30a is released to a part of the engaging claw 30a that is not engaged. The surface 37a enters and the locking claw 30a is retracted by its material elasticity, and the engagement with the locking portion 33 is released. Then, the rotation support member 23 returns to the original posture by the urging force of the spring 13 of the brake means 5 and the return spring 15. In addition, the above-described release is performed by the rotation support member 23.
Since both cases 25a and 25b are also made of synthetic resin, in an emergency, the brake lever 22 can be forcibly rotated.

Further, when it is desired to apply a brake, for example, when going down a slope, as shown in FIG. 13, the slider 26 is set to the brake release / free position and, if necessary, the desired speed is obtained. It suffices to pull the required amount of the brake lever and rotate it. Even if the brake lever 22 is rotated to a position where the locking claw 30a of the rotation support member 23 engages with the locking portion 33 of the case body 25a, the slider 26
Due to the existence of the lock prevention surface 37b in the cam portion 37 of
The locking claw 30a cannot engage with the locking portion 33, and as soon as the hand is released from the brake lever 22, the spring 1
The brake lever 22 returns to its original position due to the elasticity of 3 and the return spring 15 and the locking piece 30.

Further, for example, when the road surface is uneven or when the vehicle inclines on a slanted surface, if the front wheels are in a steering-free state, that is, in a so-called swing-unlocked state, the wheelbarrow does not travel well. In such a case, the lever member 41 of the swing-lock operation section 4 may be used even while traveling.
Can be rotated. When the lever member 41 is pushed up, the posture becomes stable as shown by the solid line in FIG. 9, and the pulling of the wire 7 is released. Then, as the pulling of the wire 7 is released, the lock lever 17 of the swinging lock means 6 also assists the biasing force of the return spring 20, and the locking claw 17a at its tip engages with the locking groove 18a. Rotate in the direction you want.

On the contrary, in order to make the swing-unlocked state, the lever member 41 is pushed down and the wire 7 is pulled.

As described above, both the brake means 5 and the swinging lock means 6 can be operated at hand, so that the operation can be performed easily and quickly. Moreover, it is possible not only when the vehicle is stopped but also when the vehicle is running. Being able to do it while driving makes it easier for pregnant women and the elderly to handle, and it is easy to use because it does not need to be stopped each time.

Further, since the input from the respective operating portions 3 and 4 to the brake means 5 and the swinging lock means 6 is performed through the wire 7, the number of parts is smaller than that of the case where the link mechanism is used. The structure is simple and the appearance can be improved.

Further, since the brake lever 22 is formed in a gate shape and is installed between the pusher handles 2, the brake lever 22 can be operated from right or left of the pusher handle 2, which is convenient for emergency operation. Good. Further, when operating the brake lever 22, for example, the thumb side of the hand may be hooked on the pusher handle 2 and the other finger side may be hooked on the brake lever 22 to be gripped, so that the operation is extremely simple. , Can be done without requiring great power. Moreover, since it can be operated with both hands, it is suitable for elderly people who are weak.

Further, since the wheels 18 on the front side of the caster body are connected to each other by the connecting rod 21, only one set of the swing lock means 6 and the swing lock operating section 4 is sufficient, and the number of parts is reduced and the operability is reduced. Can be improved. By this, at the same time, two kinds of means, that is, the operating means 3, 4 of the brake means 5 and the swinging lock means 6 can be easily made to coexist in one place.

Even if the two types of means coexist, the operation is simple and easy.

The relationship between the configuration of the present invention and that of the above-described embodiment is shown. The operating portion of the present invention corresponds to the brake operating portion 3 of the embodiment, and the engaging / disengaging means corresponds to the slider 26.

The operation part of the brake means 5 may be constituted by the swing lock operation part 4 in the embodiment, and the operation part of the swing lock means 6 may be constituted by the brake operation part 3 in the embodiment. In addition, two gate-shaped levers (a brake lever and a swinging lock lever) may be installed on the operation portion to operate each operation portion.

[Brief description of drawings]

FIG. 1 is a right side view of a frame of a wheelbarrow.

FIG. 2 is a left side view of the frame of the wheelbarrow.

FIG. 3 is a perspective view of an operation unit.

FIG. 4 is a side view of the braking means.

FIG. 5 is a side view of the swing lock means.

FIG. 6 is a sectional view of a brake operating portion.

FIG. 7 is a partially broken sectional view of a brake operating portion.

FIG. 8 is a perspective view of a slider.

FIG. 9 is a cross-sectional view of a swing-lock operating section.

FIG. 10 is a perspective view of a lever member.

FIG. 11 is a sectional view showing an operating state.

FIG. 12 is a sectional view showing an operating state.

FIG. 13 is a sectional view showing an operating state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Frame of a pushcart 2 ... Pusher handle 3 ... Brake operation part 5 ... Braking means 7 ... Wire 8 ... Wheel 9 ... Braking member 22 ... Brake lever 23 ... Rotation support member 25a ... Case main body 25b ... Cap member 26 ... Slider 30a ... Locking claw 33 ... Locking part 37 ... Cam part 37a ... Release surface 37b ... Locking blocking surface

Claims (4)

[Claims] 1. A brake device for a handcart, comprising brake means for applying braking to the rotation of wheels, and an operating portion for switching the brake means provided near a pusher handle. 2. A rotation support member that rotatably supports the operation portion on a pusher handle, a brake lever that rotates the rotation support member, a wire pulled by rotation of the rotation support member, and the rotation support. 2. The brake device for a handcart according to claim 1, further comprising: an engaging / disengaging means for engaging / disengaging the member at the wire pulling position. 3. A locking claw having elasticity is extended from one end of the rotation support member, and is engaged with a part of the locking claw in a width direction in a case that rotatably accommodates the rotation support member. And a locking portion for holding the rotation support member at the wire pulling position is formed, and a slider that slides in a state where the cam portion is housed in the case is provided on the outer peripheral surface of the case, and the cam portion is The release surface that retracts the locking claw that has engaged with the locking portion in the non-locking direction, and the locking claw that tries to engage with the locking portion when the slider is set to a predetermined position on the rotation support member side. The brake device for a handcart according to claim 2, further comprising: a locking prevention surface that is retracted to be in an unlockable state. 4. The brake device for a handcart according to claim 2, wherein the brake lever is formed in a gate shape that is installed between pusher handles.