JPH0345897Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) The present invention relates to a hand truck.

(Prior art and its problems) Conventional carriers with push handles attached to the trolley are designed to be moved on a horizontal floor. You have to apply force in the direction of pushing up the carrier, which is hard work, and if your hand slips from the push handle while pushing the carrier up and you let go of the carrier, the carrier will move backwards on its own.
There was also a risk of injury to workers.

The present invention reveals a transport vehicle that can solve the above problems.

(Means for Solving the Problems) The transport vehicle of the present invention is equipped with a one-way brake device 7 and a release device 9 for the brake, which allow the truck 1 to move forward and only prevent backward movement, and the brake device 7
In this example, a contact surface 70 is provided on the frame 11 of the truck 1 at a position behind the wheel 13, and the wheel 13 and the contact surface 70 are connected to each other.
A space 79 with an enlarged upper part is formed between the space 79 and a brake rolling element 72 having a diameter larger than the minimum gap of the space 79, which is rollable and movable up and down. space 79
The brake release device 9 is constructed so as to be in contact with the front wheel 13 and the rear contact surface 70, and the rolling element 72 is linked to a lever pivotably supported in a vertical plane.

(Operation and Effect) When the wheels 13 rotate in the forward direction, the wheels 13
An upward frictional force is generated between the space 79 and the rolling element 72 and acts to rub the rolling element 13 up to the enlarged part at the upper part of the space, preventing the rolling element 13 from digging into between the space 79 and the contact plate 70. This is prevented and there is no problem with the forward movement of the transport vehicle.

When the carrier is released from the carrier while it is being pushed up the climbing slope, a backward force due to its own weight acts on the carrier, causing the wheels 13 to rotate backward. At this time, a downward frictional force is generated between the wheel 13 and the rolling element 13 and acts to rub the rolling element 13 down into the narrow part at the bottom of the space 79, causing the rolling element 13 to contact the space 79 and the contact plate 70. It bites in between to apply a braking force to the wheel 13 and prevent the wheel from rotating backwards.

Therefore, even if the carrier vehicle takes a rest while being pushed up the slope, the danger of the carrier vehicle sliding down the slope and injuring the worker can be eliminated.

In addition, since the brake device is provided on the outside of the wheel, the wear condition of the rolling elements 72 can be seen from the outside, and
Maintenance of the brake system is possible without removing the wheels.

(Example) FIGS. 1, 2, and 3 show a transport vehicle exclusively for drums, and the transport vehicle also has a function to raise fallen drums.

The trolley 1 of the transport vehicle has a base plate 12 protruding from the center of a U-shaped frame 11, and caster-type rear wheels 14 are attached to the base plate.
A bifurcated mounting portion 17 is formed at both ends of the front wheel 1 to support a front wheel 13 thereon.

A hollow guide rod 15 is vertically erected on the base plate 12, and the elevating frame 2 is disposed on the guide rod 15 so as to be movable up and down.

An elevating drive device 4 is connected to the elevating frame 2, and the elevating drive device 4 of the embodiment has a hydraulic cylinder 43 with the piston rod facing upward in the guide rod 15.
and two hanging plates 21 on the piston rod.
The lifting frame 2 is connected to the cylinder 43 via the lift frame 2, and a foot-operated hydraulic pressure generator 42 disposed on the base plate 12 is connected to the cylinder 43.
2 is connected to a hand-cranked knob 44 for releasing hydraulic pressure.

The two hanging plates 21, 21 are located on both the left and right sides of the guide rod 15.

A clamping device 3 for the drum can 8 is disposed on the lifting frame 2. The clamping device 3 is a known mechanism, and includes a support rod 22 projecting upward from the lifting frame 2 at a position in front of the guide rod 15. A fixed lower claw plate 33 that supports the lower surface of the upper edge 81 of the drum rod is provided at the upper end of the support rod to project forward.

A holding member 31 is swingably supported at the upper end of the support rod 22, and a shaft 34 protruding from the hanging plate 21 is engaged with a horizontally long hole 30 formed at the base end of the member 31, and the holding member 31 is A movable upper claw plate 32 is protrudingly provided at the tip of 31 in correspondence with the fixed lower claw plate 33.

When the upper edge 81 of the drum can 8 is placed on the lower claw plate 33 and a load is applied, a rotational force is applied to the front end of the holding member 31 downward about the pivot 35, and the upper claw plate 32 and the lower claw plate 33 hold the drum can together. The upper edge 81 of 8 can be clamped.

The front side of the holding member 31 can rotate upward by the allowance of the elongated hole 30, and the upper edge 81 of the drum can 8 and the upper claw plate 3
2 engagement/disengagement is possible.

A U-shaped frame 11 is attached to the lower part of the elevating frame 2, and a horizontal rod 6 that moves up and down together with the frame 2 is attached in a direction perpendicular to the direction of movement of the truck 1, as shown in FIG. A pair of arm rods 5, 5 are arranged at both ends of the rod 6 so as to be able to rise and fall on a vertical plane facing the traveling direction of the truck 1.

Brackets 65 are provided at both ends of the horizontal rod 6 to protrude in the direction of movement of the truck 1, and the base end of the arm rod 5 is attached to the brackets 65 by a pivot 62 so as to be movable up and down.

As shown by the chain line in FIG. 5, when the arm rod 5 is erected, it hits the horizontal rod 6 and is held in a state where it falls slightly backward from the vertical state.

The bracket 65 is provided with a stop plate 61 for holding the arm rod 5 in a horizontal position, and the front end of the stop plate is formed into an arcuate surface 63 along the peripheral wall of the drum can 8. As will be described later, the arcuate surface 63 plays the role of keeping the drum 8 in a substantially vertical position by coming into contact with the peripheral wall of the drum 8 when the drum 8 is raised.

The distance between the arm rods 5 is slightly smaller than the diameter of the drum can 8, and the length of the arm rod 5 is slightly smaller than the diameter of the drum can 8 in the fallen state.
The length corresponds approximately to the length of the protrusion 82 of the first can body from one end, and the protrusion 82 is attached to the tip of the arm rod 5.
A substantially spherical abutting member 51 that can be hooked onto 2 is provided in a protruding manner.

The contact member 51 is made of a material with a large coefficient of friction, such as rubber.

At both ends of the U-shaped frame 11, a one-way brake device 7, which is a feature of the present invention and prevents only the backward movement of the carrier, is removably provided.

As shown in FIG. 3, the brake device 7 forms a contact surface 70 on the bifurcated mounting portion 17 of the frame 11, the lower part of which is inclined in a direction toward the wheel 13 in accordance with the rear position of the wheel 13. A space 79 whose upper part is enlarged is formed between the slope surface 70 and the wheel 13. A roller-shaped brake rolling element 72 having a diameter larger than the minimum gap of the space 79 is fitted into the space 79.

The outer periphery of the rolling element 72 is made of an elastic material with excellent wear resistance, and a shaft 73 passes through the center. ing.

When a backward force acts on the transport vehicle, that is, the third
In the figure, when the wheel 13 rotates backward in the direction of arrow A, the rolling elements 72 rotate in the opposite direction to the rotation as shown by arrow a due to friction with the wheel 13, and at this time, the rolling elements 72 rotate downward. Upon receiving the force, it bites between the abutting surface 70 and the wheel 13 to generate a strong braking force on the wheel 13, thereby preventing the wheel from rotating backward.

When the transport vehicle moves forward, that is, when the wheels 13 rotate forward in the direction of arrow B, the rolling elements 72 rotate in the direction shown by arrow B. At this time, an upward force acts on the rolling elements 72, causing the contact surface 70 and the wheels to rotate. 13 and does not interfere with the forward rotation of the wheel 13.

A brake release device 9 is connected to the one-way brake device 7.

As shown in FIGS. 1 and 3, the brake release device 9 has brackets 93 projecting downward from both bent portions of the U-shaped frame 11 of the truck 1.
A lever 91 is rotatably supported in a vertical plane toward the front wheel 13.

The free end of the lever 91 is located directly below the rolling element 72, and a roller 92 that pushes up the rolling element 72 is rotatably supported on the free end.

As shown in FIG. 2, the base ends of both levers 91 on the pivot side are connected together by a substantially U-shaped connecting rod 94, and a U-shaped hand handle 95 is attached to the connecting rod 94 so as to extend rearward and diagonally upward. The lever 91 and the handle 95 are provided in a protruding manner, and the lever 91 and the handle 95 rotate together.

As shown in Fig. 1, the lever 91 and the U-shaped frame 1
A spring 98 is provided between the handle 95 and the lever 91 to urge the free end of the lever 91 downward, and the handle 95 is stopped against a front stopper 96 formed on the U-shaped frame 11. At this time, the thrust roller 92 is in the lowered position and is away from the brake rolling element 72, and the brake is in a state where it is applied. That is, if the handle 95 is not touched or the handle is pushed forward, the one-way brake is always applied and the transport vehicle is prevented from moving backward.

Pull the push handle 95 backward and remove the base plate 1.
When the hand handle 95 is placed in contact with the rear stopper 97 protruding from the rear stopper 97, the free end of the lever 91 is lifted and the push-up roller 92 pushes up the brake rolling element 72, as shown by the chain line in FIG. ,
The rolling element 72 is separated from the wheel 13 and the contact surface 70, and the brake is released.

Next, a method of using the carrier according to the embodiment will be explained.

Raising a Drum To raise a fallen drum, as shown in Figure 1, lower the lifting frame 2 of the transport vehicle, and with the arm lever 5 tilted forward, raise the transport vehicle onto the fallen drum 8. Poke from the top plate side.

When the contact member 51 at the tip of the arm rod 5 passes over the protrusion 82 of the drum can 8, the foot pedal 41 is operated to raise the elevator frame 2.

As the lifting frame 2 rises, the arm rod 5 also rises, and the abutting member 51 of the arm rod 5 catches on the protrusion 82 of the drum can 8. In this state, the arm rod 5 rises and reaches the top of the drum can 8. Raise the board side.

When the center of gravity of the container exceeds the vertical plane relative to the floor, the container will stand up under its own weight.

Transporting the Drum The lifting frame 2 is lowered to raise the arm rod 5, and the drum 8 is clamped against the container in the upright state by the clamping device 3 on the lifting frame 2, as is known in the art.

The elevating frame 2 is raised again and the drum is lifted off the floor. At this time, the circumferential wall of the drum can 8 comes into contact with the arcuate surface 63 of the bracket 65 supporting the arm rod 5, and the drum is lifted up in a substantially vertical position.

In this state, push the hand handle 95 forward.
Since the handle 95 is in contact with the front stopper 96, the force pushing the handle becomes the force pushing the transport vehicle.
A truck loaded with drums can be transported to the desired location.

When the handle 95 hits the front stopper 96, the one-way brake device 7 is activated as described above, so there is no problem with forward movement.
Cannot move backwards. Therefore, even if you release your hand from the carrier when pushing the carrier up the climbing slope, the carrier will not slide off.

Reverse movement of the transport vehicle When it becomes necessary to move the transport vehicle backwards,
Pull the push handle 95 backward against the spring 98 and hit the rear stopper 97. As mentioned above, the free end of the lever 91 rises, and the brake rolling element 7
2 is pushed up and away from the wheel 13 and the contact surface 70, and the brake is released.

Furthermore, when the push handle 95 is pulled, the carrier moves backward.

Other Embodiments FIG. 6 shows another embodiment of the brake device 7 and the brake release device 9.

A plate piece 75 is provided on the front end side of the frame 11 to protrude upward corresponding to the rear position of the front wheel 13.
5 is used as a contact surface 70, and a space 79 whose upper part is enlarged is formed between the contact surface 70 and the wheel 13.

Brake rolling element 72 that fits into the space 79
is rotatably disposed on a U-shaped lever 71 that is rotatably attached to the pivot shaft 78 of the wheel 13 so as to straddle the wheel 13 .

The mounting shaft 73 of the rolling element 72 is fitted into a hole 76 formed in the lever 71 with a margin, and can be moved by the margin of the hole 76.

A holding means for holding the lever 71 in a position where the rolling element 72 is spaced apart from the contact surface 70 is connected to the free end of the lever 71 .

The holding means is constructed by disposing a hanging shaft 77 with a handle on the free end of the lever 71 so as to be slidable toward the center of the wheel 13, and engaging the shaft 77 with the plate piece 75. The shaft 77 is connected to the plate piece 75.
When hooked to the upper end, the rolling element 72 separates from the plate piece 75, and when the shaft 77 is pulled to avoid the plate piece 75 and the lever 71 is allowed to fall, the rolling element 72 moves away from the plate piece 75.
comes into contact with both the plate piece 75 and the wheel 13, and the brake is applied.

In the above two embodiments, the brake rolling elements 72 are formed into a roller shape, and the center is supported by the shaft 73, but the brake rolling elements are not limited to this, and the brake rolling elements may be spherical. Even if the spherical rolling element is housed in the space 92 between the contact surface 70 and the wheel 13 without being supported by a shaft, the same effect as described above can be obtained.

Furthermore, the present invention is not limited to the above-mentioned embodiments, and various modifications can be made within the scope of the claims of the utility model registration.

[Brief explanation of the drawing]

Figure 1 is a front view of the carrier vehicle with the brake device applied, Figure 2 is a plan view of the carrier vehicle, Figure 3 is an explanatory diagram of the brake device, and Figure 4 is the front view of the vehicle with the brake device released. Figures 5 and 5 are oblique views of the arm rod support section, and Figure 6 is an explanatory view of another embodiment of the brake device. 1... Trolley, 13... Wheels, 2... Lifting frame, 3
... Clamp device, 4 ... Lifting drive device, 7 ...
Brake device, 72...Rolling element for brake.

Claims (1)

[Claims for Utility Model Registration] The truck 1 is equipped with a one-way brake device 7 that allows forward movement and only prevents backward movement, and a release device 9 for the brake. A contact surface 70 is provided at a rear position to form a space 79 with an expanded upper part between the wheel 13 and the contact surface 70, and a brake rolling element 72 having a diameter larger than the minimum gap of the space 79 is provided in the space 79. The brake release device 9 is arranged so as to be able to roll and move up and down, and the rolling elements 72 are applied to the front wheels 13 and the rear abutment surface 70 of the space 79 by their own weight, and the brake release device 9 is disposed in a vertical plane. The rolling element 72 is linked to a rotatably supported lever, and by rotating the lever, the rolling element 72 is
2 from the narrow part of the space 72 to release the brake. The brake release device has a lever 91 pivotally supported on the frame 11 so as to be rotatable in a vertical plane, and the free end of the lever on the opposite side from the operating side free end is located below the brake rolling element 72. A transport vehicle as set forth in item 1 of the claims for new patent registration. In the brake release device, a shaft 73 is attached to a lever 71 rotatably supported in a vertical plane on a frame 11 so as to be movable up and down, and a rolling element 72 is attached to the shaft 73.
The transportation vehicle according to claim 1 of the utility model registration claim supporting.