JPS61139501A - Pallet with caster - Google Patents

Abstract

PURPOSE:To enable simple moving and stopping of a pallet and to facilitate loading and unloading of cargoes, by a method wherein a screw shaft is vertically moved through rotational driving of a sprocket, and the wheel of a caster is moved in and from the lower end of a pallet frame body. CONSTITUTION:A cylidrical upper bearing 13 is located to the upper surface of an upper frame 29 of a pallet 1A, a screw shaft 7 is located within the bearing 13, a sprocket 21 is situated to the screw shaft 7, and a roller chain 23 is engaged with the sprocket. A lower brearing 15, supporting the sprocket 21, is provided, and a universal caster 1 and a wheel 3 are attached to the lower end of the screw shaft 17 through a mounting metal 5. With a handle 46 turned, the roller chain 23 is moved, the screw shaft 7 is moved, for example, downward through rotation of the sprocket 21, the wheel 3 is protruded from a casing 27, and this brings the pallet 1A into a movable state.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a pallet with casters, and more particularly to a pallet with casters that facilitates horizontal movement of the pallet using wheels.

(Prior art) This type of conventional pallet is equipped with swivel casters with stoppers at the four corners of the pallet frame, and when loading cargo onto the pallet, the wheels are fixed by the stoppers and the pallet is moved. When necessary, the stopper would be released, the wheels would rotate, the vehicle would stop at a designated location, and the stopper would be activated again to unload the cargo.

(Problem to be Solved by the Invention) However, in such a device, the load is always applied to the main shaft and wheels of the caster, so there is a natural limit to the amount of cargo that can be loaded, and the caster stopper must be activated to avoid loading the loaded pallet. When storing a bicycle, the position of the bicycle may shift due to a defective stopper, and since the load is supported by wheels, there is a drawback that the bicycle lacks stability.

On the other hand, fixed pallets have been used for a long time,
In order to load and unload cargo using this pallet, it is necessary to use a forklift as well.For example, when loading cargo into a trunk in a narrow space such as a market, there are cases where a forklift cannot be used, and a hand truck etc. is used. Loading and unloading of cargo had to be carried out manually, which required a tremendous amount of effort and time.

In view of the above-mentioned problems of the prior art, an object of the present invention is to provide a pallet with casters that can horizontally move a pallet loaded with cargo with a simple operation, stop at a predetermined location, and unload the cargo in a stable state. Our goal is to provide the following.

(Means for Solving the Problems) The present invention provides a pallet having caster portions at the four corners of a frame body constituting the pallet, in which each of the caster portions includes:
A screw shaft constituting the main shaft of the caster, a bearing portion of the screw shaft fixed to the frame, a sprocket threaded onto the screw shaft, a driving chain belt stretched over the sprocket, and the chain belt. and a swivel caster provided at the lower end of the screw shaft, the screw shaft is moved up and down by the rotational drive of a sprocket, and the wheels of the caster can be moved in and out slightly from the lower end of the pallet frame. It is characterized by the following.

(Example of the invention) Embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of the caster part installed in the pallet with casters of the present invention, and FIG. 2 is a sectional view showing the pallet with casters of FIG. 1 in a state where the wheels are stored. .

In FIG. 1, this device includes a cylindrical upper bearing 13 provided on the lower surface of the upper frame 29 of the pallet, a lip 17 connecting the bearing 13 and the casing 27, and a lip 17 lined within the upper bearing 13. A screw shaft 7 that is in sliding contact with the upper bushing 9, a sprocket 21 that is threaded onto the screw shaft 7, a roller bearing 25 that is provided between the sprocket 21 and the upper bearing 13, and a roller bearing 25 that is connected to the sprocket 21. A combined roller chain 23, a cylindrical lower bearing 15 that supports the sprocket 21, a lower bushing 11 lined within the lower bearing 15 and on which the screw shaft 7 is slidably contacted, the bearing 15, and a casing. 27, a caster fitting 5 provided at the lower end of the screw shaft 7, and a swivel caster 1 and wheels 3 attached to the fitting. By rotating the
Drive the screw shaft 7 up and down to move the wheel 3 to the casing 2
It is inserted and removed slightly below and above the lower end of 7.

The caster part is attached to the pallet IA as shown in Fig. 4.
A chain 29 of the sprocket is wound around the sprocket, and the chain 23 is meshed with a driving sprocket. The drive sprocket is provided, for example, on the side of the pallet frame, as shown in FIG.
A driving sprocket 40 is engaged with the chain 23 wound around the four corners of the pallet, and the sprocket 40 is
It is connected to a handle 46 by a wheel gear 42 fixed to the main shaft 4 and a worm gear 44 meshed with the wheel gear 42 . By turning the handle 46 and driving the worm gear 44, the driving sprocket 40, which is provided integrally with the wheel gear 42, is driven. In addition, 50
is a free sprocket 1- to prevent the chain from slackening.

In the above configuration, when moving the pallet,
Turn the handle 46 to move the roller chain 29, and rotate the sprockets 21 at the four corners of the pallet to lower the screw shaft 7 to a predetermined position below, with the wheel 3 slightly protruding from the casing 27 as shown in FIG. Fix it.

In this state, since the lower end of the casing 27 is above the wheels 3, the pallet is rotatably supported on the ground by the wheels 3, and therefore the pallet can be moved to a desired position.

Next, when fixing the pallet in a predetermined position, the handle 46 is rotated in the opposite direction, and the chain 23 is driven to rotate the sprocket 21 and screw shaft 7 in the opposite direction, as shown in FIG. Casing 27 as shown in
When the lower end of the wheel 3 is raised slightly above the lower end, the lower end of the casing 27 comes into contact with the ground.

In this way, the pallet is not supported on the ground by the wheels 3 but by the casing 27, so that the pallet loaded with cargo can be stably installed on the ground.

In the present invention, it is sufficient that the height at which the wheels 3 are taken in and out from the lower end of the pallet casing 27 is at least 10 to 20 cm, and the wheels 3 of the caster fixed to the screw shaft 7 can move up and down the required height. The number of lives of the sprocket 21 and the screw shaft 7, etc. are set so that the sprocket 21 and the screw shaft 7 can be moved.

According to the above embodiment, the cargo loaded on the pallet can be moved horizontally by lowering the wheels of the casters as necessary, so that the cargo can be loaded and unloaded onto a truck or the like in units of pallets. By simply moving it to a predetermined location and retracting the caster wheels to secure it in a stable state, it becomes extremely convenient to load and unload cargo, transport, and store it. In addition, pallets can be used to load and unload cargo from all four directions, which is advantageous for cargo handling operations.Also, pallets can be moved relatively short distances while loaded, without taking up much space, unlike in the case of four-crits. Moreover, it is extremely convenient because it can be easily loaded and unloaded onto a transport vehicle such as a truck in a loaded state.

In the above embodiment, the sprocket 21 and roller chain 23 can be replaced with rollers and belts, and the sprocket or rollers may be driven by an electric motor or the like instead of manually using a handle.

(Effects of the Invention) The pallet with casters of the present invention can be easily moved to a predetermined location using the casters of the pallet, and is extremely convenient for loading and unloading cargo.

[Brief explanation of drawings]

1 and 2 are explanatory diagrams of the main parts of the pallet with casters of the present invention, FIG. 3 is a detailed explanatory diagram of the drive unit, and FIG. 4 is a schematic diagram of the pallet with casters of the present invention. FIG. l...Flexible caster, IA...Pallet, 3...
・Free wheel, 5... Caster mounting bracket, 7...
Screw shaft, 9... Upper bushing, 11... Lower bushing, 13... Upper bearing, 15... Lower bearing,
17... Lip for upper bearing, 19... Rib for lower bearing, 21... Sprocket, 23... Roller chain, 25... Bearing, 27... Casing, 2
9... Upper frame, 31... Lower frame. Agent Patent Attorney Takenaga Kawakita Fig. 1 1...Swivel caster 1A...Pallet 3 - Wheels for swivel caster Fig. 2 Fig. 8 T''1LnJL^50 29...Upper frame 31--Lower flame

Claims (1)

[Claims] (1) In a pallet having caster parts at the four corners of a frame body constituting the pallet, each caster part has a screw shaft constituting the main shaft of the caster, a bearing part of the screw shaft fixed to the frame body, It has a sprocket screwed onto the screw shaft, a driving chain belt stretched over the sprocket, a driving means for the chain belt, and a swivel caster provided at the lower end of the screw shaft, and rotates the sprocket. A pallet with casters, characterized in that the screw shaft is moved up and down by driving, so that the wheels of the casters can be moved in and out slightly from the lower end of the pallet frame.