JP6304827B2 - Cart with lock mechanism - Google Patents

Description

  The present invention relates to a carriage used for transporting articles, and particularly to a carriage having a small placement surface and having a lock mechanism.

Conventionally, Patent Document 1 or Patent Document 2 has been proposed as a lock mechanism for a cart that can place and carry articles.

Patent Document 1 is a grounding-capable locking mechanism provided on a carriage provided with wheels, and the locking mechanism is composed of a support body that can be grounded and connected to the lower part of the carriage, and a locking means provided on the support body. The support body is connected to the lower portion of the carriage and is formed in a square shape in plan view, and is formed in a square shape in plan view so as to be in contact with the ground and provided with a base member having a first cylindrical member opened at least downward. A leg member provided with a second cylinder member; and a third cylinder member that is positioned in the middle of the base member and the leg member and that is formed in a square shape in plan view and that is open at least below, and below the first cylinder member A third cylindrical member is provided in the opening portion on the side so as to be slidable in the vertical direction, and a second cylindrical member is provided in the opening portion on the lower side of the third cylindrical member so as to be slidable in the vertical direction.
Patent Document 2 discloses a hand cart that supports a wheel on a pair of side pieces of a caster frame that is attached to a loading platform so that the wheels can roll freely. The side carriage is arranged on one side piece and the side pieces of the caster frame. A restriction rod installed on the support piece, a pressing spring for urging the restriction rod so as to intersect the wheel portion of the wheel, and an operation for retracting the restriction rod from the wheel portion against the urging force of the pressing spring. Disclosed is a handcart stop device comprising a piece and a drive lever for driving the actuating piece.

JP 2007-283902 A Japanese Patent Laid-Open No. 9-207786

Since the lock mechanism of the cart of Patent Document 1 is a mechanism that locks by stepping on the pedal member for locking, it is necessary to install the pedal member so that it protrudes backward from the back surface of the cart. Then, in this kind of lock mechanism, since the popped-out pedal member contacts the worker or an obstacle, there is a problem that the worker is in danger, and the pedal member is damaged by contacting the obstacle. . In addition, there was a problem that the brake pedal could not stand up when it was stored with the cart upright.
In addition, since Patent Document 2 is configured to operate the lock of the carriage by rotating the drive lever, the number of various components that transmit power from the drive lever and the drive lever to the lock mechanism increases. The assembly volume is required.
2. Description of the Related Art In recent years, a truck with a lock that has a size that is as small as possible and that has a volume that is smaller than that of a conventional example, such as eliminating working pieces, and has a lock is desired.

  The present invention solves the above-described conventional problems, prevents the pedal member from coming into contact with obstacles, ensures the safety of the operator and the cart, and can maintain the cart in an upright state. Therefore, the purpose is to save space and to reduce the number of parts, and to reduce costs and assembly volume.

The cart according to the present invention includes a loading platform on which an article is placed, a caster frame provided on the rear side of the back of the loading platform, wheels provided on the caster frame, and both sides or at least the inside of the wheels in a horizontal direction. A plurality of recesses formed in an annular shape;
In the cart provided with a lock mechanism for locking the wheel by inserting and removing the wheel lock pin in the recess in the width direction of the cart,
The lock mechanism includes the wheel lock pin provided with a flange, a pair of shaft support portions provided with holes passing through the wheel lock pin in the horizontal direction, a pressing spring surrounding the wheel lock pin, and a left rear wheel. A rotating body holding portion fixed to the back of the main body of the carriage between the right rear wheel, and a rotating body that is held by the rotating body holding portion and includes a lock lever portion and a cam portion,
The shaft support portion includes a wheel side shaft support portion and a rotating body side shaft support portion,
At the time of locking, by rotating the lock lever portion of the rotating body, the cam portion of the rotating body increases the pushing width in the width direction of the wheel lock pin against the elastic force of the pressing spring, thereby rotating the wheel lock pin. Move it in the width direction of the carriage so that the end of the wheel lock pin meshes with the recess of the wheel,
When unlocking,
By rotating the lock lever in the direction opposite to that when the rotating body is locked, the cam portion of the rotating body reduces the pushing width in the width direction of the wheel lock pin, and the pressing spring is caused by the elastic force of the flange portion of the wheel lock pin. By pressing the wheel side shaft support portion, the end portion of the wheel lock pin is prevented from meshing with the recess of the wheel.

According to the cart of the present invention, since it has a rotating body having a lock lever portion and a cam portion, the lock lever portion does not jump out from the back surface of the cart both when locked and unlocked. It is possible to prevent the lock lever portion from coming into contact with an obstacle. Therefore, when the carriage is transported or stopped, the safety of the worker and the carriage can be ensured, and the carriage can be stored in a standing state.
In addition, since the lock mechanism has a relatively small number of parts, such as a wheel lock pin, a shaft support part, a pressing spring, a rotating body holding part, and a rotating body, and the volume of each part is small, cost reduction and assembly volume reduction can be achieved.
Furthermore, the cam portion of the rotating body moves the wheel lock pin in the width direction of the carriage by increasing the pushing width in the width direction of the wheel lock pin against the elastic force of the pressing spring, and the end of the wheel lock pin is Since it is formed so as to mesh with the recess of the wheel, it can be reliably locked unlike a conventional mechanism that presses and locks the brake shoe.

It is a perspective view which shows the conveyance trolley | bogie in one Example of this invention. It is an expansion perspective view in FIG. It is a bottom view at the time of unlocking in FIG. It is a bottom view at the time of lock in FIG. FIG. 5 is an enlarged bottom view in FIG. 4. FIG. 5 is a cross-sectional view taken along line A-A ′ in FIG. 4.

  FIG. 1 shows a perspective view of a carriage in one embodiment of the present invention. FIG. 2 shows an enlarged perspective view of the carriage in one embodiment of the present invention.

  First, the structure of the trolley | bogie 100 in one Example of this invention is demonstrated.

The cart 100 has a loading platform 10 on which articles can be placed (the loading platform 10 is shown in FIG. 6), and caster frames 20 are provided on the left and right sides of the rear surface of the loading platform 10. Each frame 20 is provided with wheels 21. A plurality of recesses 22 formed in an annular shape in the horizontal direction are formed on both sides or at least the inside of the wheel 21. The wheel 21 can be locked by inserting and removing the wheel lock pin 30 in the recess 22 in the width direction of the carriage 100.
Although not limited, the loading platform 10 is made of synthetic resin, metal, wood, or the like, and is formed in a substantially rectangular shape having a long planar shape on one side.

The wheel lock pin 30 is provided with a flange 31 for receiving the pressure of the pressure spring 32, and the pressure spring 32 is surrounded by the wheel lock pin 30.
The shaft support portion 40 is provided with a hole for passing the wheel lock pin 30 in the horizontal direction, and is composed of a set of a wheel side shaft support portion 41 and a rotating body side shaft support portion 42. However, since the shaft support mainly plays a role of maintaining the operation of the wheel lock pin, it may be composed of one or more sets as long as the operation is not hindered.
The wheel side shaft support portion 41 and the rotating body side shaft support portion 42 mainly have a role of supporting the wheel lock pin 30. Further, the wheel-side shaft support portion 41 is pressed by the pressing spring 32, and the reaction force of the pressing spring 32 is applied to the flange portion 31 of the wheel lock pin 30 so that the wheel width of the wheel lock pin 30 is unlocked. The pushing width in the direction is reduced so that the end of the wheel lock pin 30 does not mesh with the recess 22 of the wheel 21.

A rotating body holding unit 50 is fixed to the back surface of the main body of the carriage 100 between the left rear wheel and the right rear wheel.
As shown in FIG. 2, the rotating body holding unit 50 holds the rotating body 60, and the cam unit 62 is restricted in the vertical direction to prevent the rotating body 60 from being detached from the rotating body holding unit 50. Yes.
The rotating body 60 includes a lock lever portion 61 and a cam portion 62. By rotating the lock lever portion 61, the cam portion 62 rotates in conjunction with the rotation, and transmits the force to the wheel lock pin 30. Can do. Therefore, it is possible to lock or unlock (unlock) by operating the lock lever portion 61.
Although not shown, in order to stably maintain the locked state and the unlocked state, an engagement recess is provided in the wall surface of the rotating body holding portion 50, and the inner wall surface of the cam portion 62 that contacts the rotating body holding portion 50 It is conceivable to provide an engaging projection on the surface. Thereby, when the cam part 62 is rotated, only when locked or unlocked, the engaging concave part and the engaging convex part engage with each other, and the locked state and the unlocked state can be stably maintained. .

  FIG. 3 shows a bottom view when the carriage is unlocked in one embodiment of the present invention. FIG. 4 shows a bottom view when the carriage is locked in one embodiment of the present invention.

  Next, the usage method of the cart 100 and the mechanism of the lock mechanism in one embodiment of the present invention will be described.

FIG. 3 shows the cart 100 when unlocked, which is used when the cart 100 moves. Since the method of moving the carriage 100 is the same as that of a general carriage, a description thereof will be omitted. The method of locking the carriage 100 from the time of unlocking only needs to rotate the lock lever portion 61 in the clockwise direction. However, in order to lock completely, it is necessary to rotate the lock lever part 61 until the wheel lock pin 30 meshes with the recessed part 22 of the wheel 21.
In this embodiment, a method of locking by rotating in the clockwise direction is adopted, but it is also possible to lock by rotating in the counterclockwise direction by creating the rotating body 60 for the left and right objects.

  The mechanism of this locking mechanism is that when the lock lever portion 61 of the rotating body 60 is rotated, the cam portion 62 of the rotating body 60 is pushed in the width direction of the wheel lock pin 30 against the elastic force of the pressing spring 32. The wheel lock pin 30 is moved in the width direction of the carriage 100 by increasing the width, and the end of the wheel lock pin 30 is engaged with the recess 22 of the wheel 21 so that the lock can be achieved. The cart 100 after locking is as shown in FIG.

  The method of unlocking the carriage 100 from the time of locking only needs to rotate the lock lever portion 61 counterclockwise. In order to unlock completely, it is necessary to rotate the wheel lock pin 30 to a position where it does not mesh with the recess 22 of the wheel 21. In addition, by creating the rotating body 60 for the left and right objects, the rotating body 60 can be unlocked by rotating clockwise.

  The mechanism of the lock mechanism when unlocked is that the cam portion 62 of the rotary body 60 is pushed in the width direction of the wheel lock pin 30 by rotating the lock lever in the opposite direction (clockwise) to the rotary body 60 when locked. The pressure spring 32 presses the flange 31 and the wheel side shaft support 41 of the wheel lock pin 30 so that the end of the wheel lock pin 30 does not accidentally mesh with the recess 22 of the wheel 21. Therefore, it is possible to unlock safely.

FIG. 5 shows an enlarged bottom view when the carriage is locked in one embodiment of the present invention. FIG. 6 is a cross-sectional view taken along line AA ′ of the carriage in one embodiment of the present invention.
As shown in FIG. 6, at the time of locking, the lock lever portion 61 does not jump out rearward from the back surface of the carriage, so that the lock lever portion 61 can be prevented from coming into contact with an obstacle. Therefore, it is possible to ensure the safety of the worker and the cart 100 when the cart 100 is transported or stopped. Although not shown, even when unlocked, the lock lever portion 61 does not protrude rearward from the rear surface of the carriage 100 in the same manner as when locked, ensuring safety.

In addition, this invention is not limited to the said Example. For example, the brake is made of synthetic resin, but may be made of metal or the like. The material of the top plate is the same.

DESCRIPTION OF SYMBOLS 10 Loading platform 20 Caster frame 21 Wheel 22 Recessed part 30 Wheel lock pin 31 Hook part 32 Pressing spring 40 Shaft support part 41 Wheel side shaft support part 42 Rotating body side shaft support part 50 Rotating body holding part 60 Rotating body 61 Lock lever part 62 Cam part 100 Carriage

Claims (1)

A loading platform on which goods are placed;
A caster frame provided on the rear side of the back of the cargo bed;
Wheels provided on the caster frame;
A plurality of recesses formed annularly in the horizontal direction inside the wheel;
Have
In the carriage provided with a lock mechanism that locks the wheel by inserting and removing the wheel lock pin in the recess in the width direction of the carriage,
The lock mechanism includes the wheel lock pin provided with a flange,
A set of shaft support portions provided with holes for passing the wheel lock pins in the horizontal direction;
A pressing spring surrounding the wheel lock pin;
A rotating body holding part fixed to the back of the carriage body between the left rear wheel and the right rear wheel;
A rotating body that is held by the rotating body holding portion and includes a lock lever portion and a cam portion;
Have
The shaft support portion includes a wheel side shaft support portion and a rotating body side shaft support portion,
When locking
By rotating the lock lever part of the rotating body,
The cam part of the rotating body moves the wheel lock pin in the width direction of the carriage by increasing the pushing width in the width direction of the wheel lock pin against the elastic force of the pressing spring, and the end of the wheel lock pin is So that it meshes with the recess,
When unlocking,
By rotating the lock lever in the direction opposite to that when the rotating body is locked, the cam portion of the rotating body reduces the pushing width in the width direction of the wheel lock pin, and the pressing spring is caused by the elastic force of the flange portion of the wheel lock pin. By pushing the wheel side shaft support part, the wheel lock pin end part is prevented from meshing with the recessed part of the wheel.

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