JP4012453B2 - Wheelbarrow brake equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wheelbarrow brake device. Wheelbarrows include baby strollers that carry infants, simple wheelchairs for nursing care, and silver cars that assist walking.
[0002]
[Prior art]
It is known to provide a normal brake device and a parking brake device on a wheelbarrow. Any brake device that can be operated near the handle that is held when pushing a wheelbarrow is also known. Japanese Patent Application Laid-Open No. 2002-087273 discloses a configuration in which switching between the normal brake mode and the parking brake mode can be performed by selectively locking the hand brake lever and the hook member.
[0003]
[Problems to be solved by the invention]
However, such switching of the brake mode has to be performed by manually operating both the hand brake and the hook member. In order to eliminate the possibility of the wheelbarrow moving inadvertently, it is preferable to easily switch the brake mode with one hand and hold the wheelbarrow handle firmly with the other hand.
[0004]
[Means for Solving the Problems]
In order to solve the above problems, according to the present invention,
A brake member having one end and the other end is pivotally attached to the frame near the wheel between the one end and the other end. During normal braking, the brake member pivots in the first direction, The normal brake position that engages with the outer surface of the wheel is taken, and at the time of parking brake, it pivots in the second direction opposite to the first direction, and the other end is located between the plurality of locking portions provided on the wheel. A brake member capable of engaging the parking brake position;
A spring that biases the brake member in the second direction;
A normal brake operation lever provided near the handle to hold the wheelbarrow,
An operation wire having an upper end and a lower end, the upper end is attached to the normal brake operation lever, the lower end is attached to the brake member, and the normal brake operation lever is pivoted in the operation direction to An operation wire adapted to pivot in the first direction against the biasing force of the spring;
A switching member for switching the normal brake operation lever to a normal brake mode position and a parking brake mode position;
A wheelbarrow brake device comprising:
The normal brake operating lever is provided with a stopper,
The switching member is provided with first and second locking portions that can be selectively engaged with the stopper, and a cam surface formed between the first and second locking portions. And
The switching member is pivotable between a first position where the first locking portion engages with the stopper and a second position where the second locking portion engages with the stopper. It is provided near the normal brake operating lever,
When the switching member is in the first position, the normal brake operation lever is set to the normal brake operation mode position, and the normal brake operation lever pivots in the operation direction against the biasing force of the spring. On the other hand, when the stopper is engaged with the first locking portion, the normal brake operation lever is moved in the operation direction so that the brake member is not moved to the parking brake position by the biasing force of the spring. When the second position is reached, the normal brake operation lever is set to the parking brake mode position, and the brake member is set to the parking brake position by the biasing force of the spring. The normal brake actuating lever is allowed to pivot in a direction opposite to the actuating direction, while the stopper is By engaging with the locking portion, and the shape associated to prevent the normal brake operating lever is pivoted to said actuation direction,
The cam surface is cam-engaged with the stopper when the switching member pivots between the first position and the second position so that the stopper is engaged with the first locking portion and the second locking portion. It is made to guide between the locking parts,
A wheelbarrow brake device is provided.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 and FIG. 2 are diagrams illustrating a lower portion of a handcart brake device according to an embodiment of the present invention. In principle, the configuration of the lower part of the brake device is not significantly different from that disclosed in the above-mentioned JP-A-2002-087273. The brake member 1 includes a pair of U-shaped members 2 and a bar 3 that connects the U-shaped members 2 to each other in order to interlock the movements of the pair of U-shaped members 2. The U-shaped member 2 is pivotally attached by a pivot pin 6 to a frame 5 near each of the left and right wheels 4 on the rear side. The wheel 4 is also rotatably attached to the frame 5 by the rotating shaft 7.
[0006]
The brake member 1 is in the form of a lever that pivots about a pivot pin 6. Each end 8 of the bar 3 connecting the pair of U-shaped members 2 to each other extends in the lateral direction and forms one end of the lever. As will be described later, when the brake member 1 pivots in the first direction during normal braking operation, the end 8 of the bar 3 engages with the outer surface 9 of the wheel 4 to brake the wheel 4. The position of the brake member 1 at this time is referred to as a normal brake position. The free end 10 of the longer leg of the U-shaped member 2 extends laterally and forms the other end of the lever. As will be described later, when the brake member 1 pivots in a second direction opposite to the first direction when the parking brake is operated, the free end 10 has a plurality of locking portions provided near the inner periphery of the wheel 4. 11 is engaged to prevent the wheel 4 from rotating. The position of the brake member at this time is referred to as a parking brake position. In this embodiment, the locking portion 11 is in the form of a pin arranged in an annular shape on the hub of the wheel 4.
[0007]
A lower end of the tension spring 12 is attached in the vicinity of the connecting portion between the two leg portions of the U-shaped member 2. The upper end of the spring 12 is attached to the frame 5. The spring 12 applies a force for urging the brake member 1 to pivot in the second direction about the pivot pin 6.
[0008]
A pin 13 is provided on the short leg portion of the U-shaped member 2 on the opposite side of the spring 12 with the pivot pin 6 interposed therebetween. A lower end of an operation wire to be described later is attached to the pin 13.
[0009]
Although the configuration of the lower part of the brake device is substantially bilaterally symmetric, the bar 3 connects the left and right U-shaped members 2 so as to be interlocked with each other. What is necessary is just to attach only to the character-shaped member 2. FIG.
[0010]
Next, the structure of the upper part of the brake device will be described with reference to FIGS. In each of these drawings, (a) shows the position of the upper part of the brake device in each brake mode, and (b) shows the position of the lower part of the brake device corresponding to the same brake mode. The upper part of the brake device is usually provided with a brake actuating lever 14. Usually, the brake operating lever 14 is disposed adjacent to the handle 15 that is held when the handcart is pushed, and is pivotally attached to the handle 15 by a pivot pin 16. The handle 15 has an inverted U-shaped frame shape so that it can be easily held and pushed by the handcart. The normal brake operating lever 14 also has an inverted U-shaped frame shape so that it can be easily pivoted with the thumb while holding the handle 15 by hand.
[0011]
The upper end of the operation wire 17 is attached to the normal brake operation lever 14. On the other hand, as described above, the lower end of the operation wire 17 is attached to the pin 13 provided on the U-shaped member 2. 3 to 5, when the normal brake operation lever 14 is pivoted counterclockwise, that is, the operation direction by the hand force, the operation wire 17 is pulled, and the brake member 1 is pivoted against the biasing force of the spring 12. It pivots clockwise about the pin 6 (first direction). When the hand force is released from the normal brake operating lever 14, the brake member 1 is pivoted counterclockwise (second direction) by the biasing force of the spring 12, and the normal brake operating lever 14 is connected via the operation wire 17. By receiving the force of the spring 12, it pivots clockwise about the pivot pin 6.
[0012]
The brake device of the present invention is most characterized by a switching member 18 constituting a part of the upper portion. The switching member 18 switches the normal brake operation lever 14 between the normal brake mode position and the parking brake mode position.
[0013]
The normal brake operating lever 14 is provided with a stopper 19 for interacting with the switching member 18. In this embodiment, the stopper 19 is in the form of a pin.
[0014]
The switching member 18 is pivotally attached to the handle 15 by a pivot pin 20, usually near the brake actuation lever 14. The switching member 18 is formed with a first locking portion 21 and a second locking portion 22 that are selectively engageable with the stopper 19 in the form of a recess. The switching member 18 is further provided with a cam surface 23 formed between the first locking portion 21 and the second locking portion 22.
[0015]
The switching member 18 includes a first position where the first locking portion 21 engages with the stopper 19 (FIG. 3) and a second position where the second locking portion 22 engages with the stopper 19 (FIG. 5). ). The switching member 18 has a knob portion 24. By operating the knob portion 24 with a finger of one hand, the switching member 18 can be easily pivoted between the first position and the second position. Can do. During this pivoting movement, the cam surface 23 is cam-engaged with the stopper 19 to guide the stopper 19 between the first locking portion 21 and the second locking portion 22.
[0016]
The action of the brake when the switching member 18 takes each position will be described. When the switching member 18 is in the first position (FIG. 3), the stopper 19 is engaged with the first locking portion 21 and the normal brake operation lever 14 is in the normal brake operation mode position. At this time, in the brake member 1, the end portion 8 of the bar 3 is not engaged with the outer surface 9 of the wheel 4, and the free end 10 of the U-shaped member 2 is also engaged between the plurality of locking portions 11 of the wheel 4. It is in a position that does not match. The first locking portion 21 of the switching member 18 is engaged with the stopper 19 so that the brake operating lever 14 pivots in the direction opposite to the operating direction so that the brake member 1 does not become the parking brake position by the biasing force of the spring 12. It is because it prevents by combining.
[0017]
Thus, when the switching member 18 is in the first position, the normal brake operating lever 14 can be pivoted in the operating direction against the biasing force of the spring 12 (FIG. 4). By such pivoting of the normal brake operating lever 14 in the operating direction, the end 8 of the bar 3 of the brake member 1 engages with the outer surface 9 of the wheel 4 to apply the brake, as shown in FIG. .
[0018]
When the switching member 18 is in the second position (FIG. 5), the stopper 19 is engaged with the second locking portion 22, and the normal brake operation lever 14 is in the parking brake mode position. When the switching member 18 moves from the first position to the second position, the normal brake operation lever 14 is not prevented from pivoting in the direction opposite to the operation direction by the force of the spring 12. Therefore, the brake member 1 can also be in the parking brake position by the biasing force of the spring 12. At the parking brake position, the free end 10 of the U-shaped member 2 of the brake member 1 engages between the plurality of engaging portions 11 of the wheel 4 to prevent the wheel 4 from rotating.
[0019]
On the other hand, when the switching member 18 is in the second position, the stopper 19 engages with the second locking portion 22, so that the normal brake operating lever 14 is prevented from pivoting in the operating direction. For example, the parking brake is unexpectedly released when the back of a person sitting in a wheelbarrow hits the normal brake operating lever 14 and the normal brake operating lever 14 is inadvertently pivoted in the operating direction. It means that it can be prevented.
[0020]
When canceling the parking brake mode and shifting to the normal brake mode, the switch member 18 is moved from the second position (FIG. 5) to the first position (FIG. 3) by operating the knob portion 24 with one finger. Just pivot.
[0021]
When the switching member 18 pivots between the first position and the second position, the cam surface 23 is cam-engaged with the stopper 19 so that the stopper 19 is engaged with the first locking portion 21 and the second engagement. Since guidance is provided between the stop portion 22 and the normal brake mode and the parking brake mode, the switching member 18 need only be operated with a finger of one hand. Therefore, the handle 15 can be held with the remaining one hand to ensure that the wheelbarrow does not move carelessly.
[Brief description of the drawings]
FIG. 1 is a fragmentary exploded perspective view showing one side of a lower portion of an embodiment of a brake device according to the present invention.
FIG. 2 is a fragmentary rear view showing the lower part of one embodiment of the brake device according to the present invention, omitting the middle part of the bar.
3A is a fragmentary side view showing an upper portion of an embodiment of a brake device according to the present invention, and FIG. 3B is a fragmentary side view showing a lower portion of the embodiment, both of which are in a normal brake mode. Shows the state at a certain time.
FIG. 4 is a view similar to FIG. 3, but shows a state when the brake is applied by operating the normal brake operation lever in the operation direction in the normal brake mode.
FIG. 5 is a view similar to FIG. 3, but showing the state when in the parking brake mode.
[Explanation of symbols]
1 Brake member, 2 U-shaped member, 3 bar, 4 wheel, 5 frame, 6 pivot pin, 7 rotating shaft, 8 bar end, 9 wheel outer surface, 10 U-shaped member longer leg free End, 11 Locking portion, 12 Spring, 13 Pin for attaching operation wire, 14 Normal brake operation lever, 15 Handle, 16 Axis pin, 17 Operation wire, 18 Switching member, 19 Stopper, 20 Axis pin, 21 First Locking part, 22 2nd locking part, 23 cam surface, 24 knob part.

Claims (1)

A brake member having one end and the other end is pivotally attached to the frame near the wheel between the one end and the other end. During normal braking, the brake member pivots in the first direction, The normal brake position that engages with the outer surface of the wheel is taken, and at the time of parking brake, it pivots in the second direction opposite to the first direction, and the other end is located between the plurality of locking portions provided on the wheel. A brake member capable of engaging the parking brake position;
A spring that biases the brake member in the second direction;
A normal brake operation lever provided near the handle to hold the wheelbarrow,
An operation wire having an upper end and a lower end, the upper end is attached to the normal brake operation lever, the lower end is attached to the brake member, and the normal brake operation lever is pivoted in the operation direction to An operation wire adapted to pivot in the first direction against the biasing force of the spring;
A switching member for switching the normal brake operation lever to a normal brake mode position and a parking brake mode position;
A wheelbarrow brake device comprising:
The normal brake operating lever is provided with a stopper,
The switching member is provided with first and second locking portions that can be selectively engaged with the stopper, and a cam surface formed between the first and second locking portions. And
The switching member is pivotable between a first position where the first locking portion engages with the stopper and a second position where the second locking portion engages with the stopper. It is provided near the normal brake operating lever,
When the switching member is in the first position, the normal brake operation lever is set to the normal brake operation mode position, and the normal brake operation lever pivots in the operation direction against the biasing force of the spring. On the other hand, when the stopper is engaged with the first locking portion, the normal brake operation lever is moved in the operation direction so that the brake member is not moved to the parking brake position by the biasing force of the spring. When the second position is reached, the normal brake operation lever is set to the parking brake mode position, and the brake member is set to the parking brake position by the biasing force of the spring. The normal brake actuating lever is allowed to pivot in a direction opposite to the actuating direction, while the stopper is By engaging with the locking portion, and the shape associated to prevent the normal brake operating lever is pivoted to said actuation direction,
The cam surface is cam-engaged with the stopper when the switching member pivots between the first position and the second position so that the stopper is engaged with the first locking portion and the second locking portion. It is made to guide between the locking parts,
Wheelbarrow brake device.

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