JP4272736B2 - Wheelbarrow - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a handcart such as a load transporting handcart, and more specifically, an initial movement and direction change of an excessively heavy cart body can be easily and smoothly performed.
[0002]
[Prior art]
Conventionally, in this type of hand cart for load conveyance, the loaded cart body with wheels is manually pushed by the pushing operation of the hand handle fixed in the standing state at the rear end portion of the cart body. Yes.
[0003]
[Problems to be solved by the invention]
However, in such a conventional hand cart, since the hand handle is fixed to the cart body in an upright state, the pushing force of the hand handle is directly applied to the cart body. A great deal of force is required during the initial movement of the main body or when the vehicle is evacuated on a rough road during hand-running, or when the direction is changed.
[0004]
In addition, there is a problem in that the base of the handwheel handle to the cart body is easily damaged because stress is concentrated and an unreasonable force acts on each initial hand pushing action, resulting in poor durability of the handwheel handle.
[0005]
The present invention has been made in view of the above circumstances, and makes it possible to easily and smoothly carry out the initial movement of the heavy truck body, the escape by wheel removal, etc., or the direction change, and the durability of the handwheel handle. An object is to provide a wheelbarrow that can be enhanced.
[0006]
[Means for Solving the Problems]
To solve the problems described above, wheelbarrow according to claim 1 of the present invention, Do Ri rear wheel from accompanying the front wheels is two-wheel comprises a wheeled carriage body comprising a steering wheel of the at least one wheel, the carriage A pair of operation handles are pivotally supported on the left and right sides of the hand handle that is erected and fixed to the rear end of the main body so as to be pivotable in the front-rear direction. A wheel actuating device is provided, and each wheel actuating device is individually linked to each wheel actuating device independently and can be driven to rotate in the pushing direction.
[0008]
According to a second aspect of the present invention, in the first aspect of the invention, the operation handle is restricted to a rotation range from a standing pushing position in a standing state to a standby fixed position in an initial backward tilted state, The wheel operating device and the associated wheels of the cart body are allowed to be interlocked at the standby fixed position, while the interlocking state is released and locked at the fixed pushing position.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an overall configuration of a handcart according to the present invention, for example, a handcart for carrying a load, and reference numeral 1 denotes a wheeled carriage body. The bogie main body 1 is a four-wheeled vehicle having both front and rear wheels, for example, front wheels 2 and 2 composed of two accompanying wheels and rear wheels 3 and 3 composed of steering wheels freely rotatable in the horizontal direction. The hand push handle 4 is fixed in an upright state at the rear end.
[0010]
As shown in FIG. 2, a pair of left and right operation handles 5 and 5 are provided at portions corresponding to the left and right side portions of the hand push handle 4 on the rear end side of the cart body 1. The lower end portion 5a side of each of the operation handles 5 is pivotally supported by a bracket 6 provided at the rear end portion of the cart body 1 through a support shaft 7 so as to be rotatable in the front-rear direction X.
[0011]
Each operation handle 5 has a tilting range θ from a vertical standing pushing position Q in an upright position to a standby standing position P in an initial rearward tilting state, and a lower end portion 5a includes each of the cart main bodies 1. A wheel actuating device 10 for independently rotating and driving the associated wheels 2 is provided.
[0012]
The wheel operating device 10 includes a gear 11 coaxially provided on the associated wheel 2 of the carriage body 1, a gear claw 12 that meshes with the gear 11, and a first shaft that pivotally supports the gear claw 12 so as to be rotatable up and down. , The second operating link 14 connected to the first operating link 13, and the swing link 15 connecting the first and second operating links 13, 14 to each other. It is composed of a ratchet mechanism.
[0013]
The swing link 15 is pivotally supported on the side of the carriage body 1 via a support shaft 16 so as to be swingable in the front-rear direction X, while the second operating link 14 is operated via a shaft 17. The first operating link 13 that is coupled to the lower end portion 5a of the handle 5 and pivotally supports the gear claw 12 so as to be pivotable up and down is inserted and held in a link guide 18 that prevents lifting during reciprocating movement. .
[0014]
Further, the swing range α of the swing link 15 is regulated by a pair of front and rear stoppers 19, 19 provided on the side of the cart body 1, whereby the operation handle 5 is pushed out in an upright state. It is regulated by the tilting range θ from the fixed position Q to the standby fixed position P in the initial rearward tilted state.
[0015]
On the other hand, the gear claw 12 that is pivotally supported by the distal end portion of the first operating link 13 so as to be rotatable up and down has its distal end portion 12a at the lower end of the front end of the carriage main body 1 at the push-out fixed position Q when the operation handle 5 is raised. It is guided and rotated so as to abut on the provided guide plate 8 and away upward, so that the meshed state with the gear 11 provided coaxially on the associated wheel 2 of the carriage body 1 is released. Thereby, the interlocking state of the wheel operating device 10 by the operation handle 5 is released, and the smooth pushing operation or the pulling traveling in the pushing direction Y of the cart body 1 by the normal hand pushing handle 4 together with the lock mechanism 20 described later is enabled. Yes.
[0016]
As shown in FIG. 3, the lock mechanism 20 is provided on each of the operation handles 5, and includes an operation lever 21 and an operation rod 22 that can be moved up and down in the up-down direction Z connected to the operation lever 21. A locking claw 24 that is pivotally supported by the operation handle 5 via a shaft 23 so as to be interlocked with the raising / lowering operation of the operating rod 22 and a locking claw 24 that can be engaged and locked. It is comprised with the stop piece 25. FIG.
[0017]
The operating rod 22 connected to the operation lever 21 of the lock mechanism 20 is normally held at a raised position where it is released from the locking claw 24, and the locking claw 24 has a tip 24a from a tapered surface with a check claw shape. And is rotatably supported by the operation handle 5 so as to always maintain a horizontal locking posture by its own weight. The locking piece 25 is fixed by being raised at the rear end portion of the carriage body 1, and the locking claw 24 is engaged with the distal end portion 25 a of the locking piece 25 at the push-out fixed position Q in the standing state of the operation handle 5. The locked state is maintained by engaging and locking, so that the cart body 1 can be smoothly pushed and pulled by the normal push handle 4.
[0018]
On the other hand, when the operation mechanism 5 is unlocked by the lock mechanism 20, the operation rod 22 is lowered by manual operation of the operation lever 21, and the rear end portion 24b of the locking claw 24 is self-weighted by the lower end portion 22a of the operation rod 22. The operation handle 5 is pushed down and is rotated by rotating the tip 24a upward from the locking piece 25, thereby allowing the operation handle 5 to rotate backward.
[0019]
Then, the unlocking operation rod 22 is held by returning to the original raised position released from the locking claw 24 by manual operation of the operation lever 21 so that the locking claw 24 maintains a horizontal locking posture. Free rotation due to its own weight.
[0020]
In this case, in addition to the manual operation of the operation lever 21, the return operation of the operating rod 22 to the original raised position may be automatically returned, for example, by a biasing force of a spring.
[0021]
Next, the operation of the wheel operating device 10 will be described. When the operation handle 5 is rotated from the push-out fixed position Q to the standby fixed position P by unlocking the lock mechanism 20 shown in FIG. 3, the second operation link 14 is interlocked with the rotation operation of the operation handle 5. Moves forward, and in conjunction with the movement of the second operating link 14, the first operating link 13 moves rearward due to the swing of the swing link 15. At the same time, the gear claw 12 provided at the distal end portion of the first operating link 13 is released from the guide plate 8 and rotated downward by its own weight, and the gear 11 provided coaxially on each associated wheel 2 of the cart body 1. Wait to be located behind.
[0022]
In this state, when the operation handle 5 is pushed and rotated from the standby fixed position P to the forward pushing position Q by a manual pushing operation, as shown in FIG. In conjunction with the backward movement of the second operating link 14, the first operating link 13 moves forward by the swing of the swing link 15. At the same time, the gear claw 12 provided at the tip of the first operating link 13 meshes with the gear 11 provided coaxially with the associated wheel 2 of the cart body 1, and the gear 11 is moved to the cart body by the lever principle of the operation handle 5. 1 is rotated in the extrusion direction Y, and the associated wheel 2 of the cart body 1 is rotationally driven in the extrusion direction Y. Thereby, the rowing movement of the cart body 1 in the pushing direction Y is possible.
[0023]
When the operation handle 5 is pushed and rotated to the pushing position Q, as shown in FIG. 2, the tip 12a of the gear claw 12 provided at the tip of the first operating link 13 is provided at the lower front end of the carriage body 1. The guide is pivoted so as to abut against the guide plate 8 so as to be separated upward, and the meshing state with the gear 11 is released, whereby the interlocking state of the wheel operating device 10 by the operation handle 5 is released, and Thus, it is possible to carry out the smooth manual pushing in the pushing direction Y of the cart body 1 by the hand push handle 4.
[0024]
At this time, the distal end portion 24a of the locking claw 24 constituting the lock mechanism 20 provided on the operation handle 5 is abutted and guided by the distal end portion 25a of the locking piece 25 fixed to the rear end portion of the carriage body 1. While rotating upwards against its own weight, when it gets over the distal end portion 25a of the locking piece 25, it rotates downward due to its own weight and engages and locks into the distal end portion 25a of the locking piece 25. Thus, the operation handle 5 can be automatically locked at the fixed pushing position Q in the standing state.
[0025]
Then, the rowing operation of the cart body 1 by the operation handle 5 is performed by pushing the left and right operation handles 5 and 5 at the same time as shown in FIG. This is done by rotationally driving the left and right front wheels 2, 2 of the cart body 1.
[0026]
Further, when turning the cart body 1 to the right when changing the direction of the cart body 1, as shown in FIG. 6, the left operating wheel 5 is pushed out H to rotate the left front wheel 2 of the cart body 1. When the cart body 1 is turned to the left by making it move forward, as shown in FIG. 7, the right operating wheel 5 is pushed out H to drive the right front wheel 2 of the cart body 1 to rotate forward. Is done.
[0027]
At this time, the right turn or left turn forward movement on the front end side of the cart body 1 by the rotational drive of the left or right front wheel 2 is a steering wheel on the rear side of the cart body 1 located diagonally with the left or right front wheel 2. In order to rotate about the right or left rear wheel 3, the left and right direction change of the carriage body 1 is performed with a small turn in the minimum rotation range, and no excessive force is required.
[0028]
In this way, the initial movement of the excessively heavy cart body 1 is facilitated by moving the cart body 1 forward by the rowing operation with the operation handle 5 during the initial movement of the cart body 1 and using the movement momentum. Thus, the handwheel 1 can be smoothly pushed and turned by the handwheel 4. Moreover, the initial movement of the cart body 1 by the operation of the operation handle 5 makes it possible to reduce the push-out force of the hand handle 4, and the stress concentration at the base of the hand handle 4 as before is alleviated. Since damage to the base portion of 4 is prevented, durability can be improved.
[0029]
Further, if the operation handles 5 and 5 are repeatedly pushed out in the unlocked state, the cart body 1 can be continuously rowed.
[0030]
In the embodiment described above, the wheelbarrow for loading has been described as an example. However, for example, it can be applied to a wheelbarrow on which an elderly person or the like is placed. Further, the form of the bogie body is not limited to a four-wheeled vehicle. In addition, it goes without saying that the present invention can be variously modified without departing from the gist of the present invention.
[0031]
【The invention's effect】
As is apparent from the above description, according to the handcart according to the present invention, the front wheel is provided with a wheeled carriage main body including two accompanying wheels and the rear wheel is constituted by at least one steering wheel, and the rear end of the carriage main body is provided. A pair of operation handles are pivotally supported on both the left and right sides of the hand handle that is erected and fixed in the front and rear directions, respectively, and a wheel actuator that interlocks with the forward rotation of each of these operation handles is provided. Each of the wheel actuating devices is provided with each wheel, and the associated wheels of the cart body are independently linked to each other so that the wheels can be driven to rotate in the pushing direction. Escape or change of direction can be performed easily and smoothly, and the fatigue level of the operator can be reduced.
[0032]
In addition, the initial movement of the carriage body by pushing out the operation handle alleviates stress concentration at the base of the push handle as before, and prevents damage to the push handle, thus improving the durability of the push handle. be able to.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an overall configuration of an embodiment of a handcart according to the present invention.
FIG. 2 is an enlarged cross-sectional view of a main part of the wheel operating device.
FIG. 3 is an enlarged explanatory view of a main part of the lock mechanism of the operation handle.
FIG. 4 is an explanatory view showing the moving state of the main body of the carriage by the pushing operation from the fixed standby position to the rear of the operation handle.
FIG. 5 is a schematic explanatory view showing a straight traveling operation state of the cart body by the operation handle.
FIG. 6 is a schematic explanatory view showing a state in which the cart body is turned to the right by the operation handle.
FIG. 7 is a schematic explanatory view showing the left turn direction changing operation state of the cart body by the operation handle.
[Explanation of symbols]
1 Bogie body 2 Associated wheel (front wheel)
3 Steering wheel (rear wheel)
4 Hand handle 5 Operation handle 10 Wheel actuator 20 Lock mechanism X Front-rear direction Y Push-out direction θ Rotation range of operation handle

Claims (2)

Front wheels comprises a wheeled carriage body rear wheels Ri Do the accompanying wheel motorcycle is made of a steering wheel of the at least one wheel, the left and right side portions of the hand-push handle upright fixed to the rear end of the truck body, a pair of operation handles A wheel actuator that is pivotally supported in the front-rear direction and interlocked with the push-out pivoting operation of each of the operation handles is provided, and each wheel actuator is associated with each of the cart bodies. A handcart characterized in that the wheels can be independently driven in an interlocking manner to be driven to rotate in the pushing direction. The operation handle is restricted to a rotation range from a standing push-out position to an initial rearward stand-by stand position in the rearward direction, and at the stand-by fixed position, the wheel operating device and an associated wheel of the cart body The handcart according to claim 1, wherein the handcart is allowed to be locked by releasing the interlocking state at the fixed pushing position.

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