JP2012035774A - Carrier - Google Patents

Abstract

[PROBLEMS] To move straightly in a transport vehicle in which a pillar having a mountain-shaped cross section is fixed around a right-angled quadrangular flat plate and a free caster is attached to the lower end of each pillar so that the carriage can freely move in any direction. Provided is a transport vehicle that can be easily modified so that it can go straight when needed.
SOLUTION: A downward female screw is provided at the lower end of each strut, and the outer surface of the lower end of the female screw is protruded from the strut with a square pillar, and a new detent is prepared. A through hole of the mounting bolt and a notch for fitting the prism into the periphery of the through hole are provided, and a detent is fixed between the support column and the free caster.
[Selection] Figure 4

Description

  The present invention relates to a transport vehicle. In particular, the present invention relates to a transport vehicle whose principle is that the traveling direction can be freely changed, but relates to a transport vehicle that can be easily modified so that it can be easily moved straight in a certain direction as required.

A transport vehicle capable of freely changing the traveling direction is known. This is described, for example, in JP-A-12-60656, JP-A-2000-153761, and JP-A-2006-122191.
A typical transport vehicle described in these publications has a structure as shown in FIG. The transport vehicle shown in FIG. 1 has a right quadrilateral flat top plate P and a bottom plate Q arranged in parallel in the vertical direction, and four struts R made of angle iron are fixed at the four corners, and the lower ends of the respective struts R are fixed. It is made with a free caster S attached.

  The universal caster S used in the transport vehicle shown in FIG. 1 has a structure as shown in FIG. In FIG. 2, A is a main body part of a free caster, and is composed of a cylindrical part B and a wheel support part C. The cylindrical part B is a part for supporting the mounting bolt D and the substrate E. The mounting bolt D is rotatable on the cylindrical portion B together with the substrate E around itself. In particular, a steel ball H is interposed between the substrate E and the cylindrical portion B, so that the substrate can be easily rotated. A nut J between the mounting bolt D and the substrate E is for rotating the mounting bolt D, and is used when the universal caster is attached to the support column. The support C of the wheel has a U-shaped cross section, supports the wheel F with the shaft G, and holds the wheel F rotatably.

In the universal caster S, the shaft G is located away from the axis of the mounting bolt D. Therefore, when the universal caster is moved in a certain direction, the universal caster is arranged with the mounting bolt in front and the axis G behind. As a result, the wheel F is naturally directed in the moving direction, and is in a convenient state for proceeding in the moving direction. Therefore, the universal caster can easily travel in any direction.
In the transport vehicle shown in FIG. 1, since the free casters are attached to all the four columns, the transport vehicle can easily travel in any direction in which it is pushed.

  However, it has been found that such a transport vehicle has a drawback in that it is difficult to go straight in a certain direction because each of the casters travels in the direction in which each free caster is pushed too easily. In particular, when a heavy load is loaded and pushed, or when the road has unevenness, this defect appears remarkably. Therefore, in such a case, it has been demanded that the transportation vehicle can be modified to go straight ahead and that the modification can be easily performed.

Japanese Patent Laid-Open No. 12-60656 JP 2000-153761 A JP 2006-122191 A

  The present invention has been made to satisfy the above-described demand. That is, the present invention is a transport vehicle in which at least four pillars having a mountain cross section are fixed around a right-angled quadrangular flat plate, and a free caster is attached to the lower end of each pillar so that the carriage can freely move in any direction. In this case, it is an object of the present invention to provide a transport vehicle that can be easily modified so that it can be moved straight when it is required to travel straight.

  This invention is a transport vehicle in which a free caster is attached to the lower end of each strut, and when the free caster is detachable at the lower end of each strut and is going to go straight, a detent is attached between the strut and the free caster, In this way, the traveling direction of the free caster is restricted, and the straight traveling is easily and reliably performed.

  For this reason, the present invention uses a structure as shown in FIG. 3 as a detent. In FIG. 3, the rotation stopper X is made by bending a metal plate, forming a shaft portion 1 at one end and forming a fixing portion 2 at the other end. A through hole 3 is formed in the shaft portion 1, and a square notch 5 is formed around the through hole 3. In order to form the notch 5 in this detent, a simple means is adopted in which the upper plate 4 with the notch 5 punched out is fixed on the lower plate provided with the shaft portion 1 and the fixing portion 2 for convenience. The through-hole 3 is for penetrating the mounting bolt D of the free caster, and the shaft portion 1 is a portion located on the cylindrical portion B of the free caster.

In FIG. 3, reference numeral 6 denotes a positioning hole formed in the upper plate 4, and a positioning projection provided on the lower plate is inserted so that the notch 5 of the upper plate 4 penetrates the lower plate. It is surely positioned around the hole 3. Reference numeral 7 denotes a welded portion for fixing the upper plate 4 to the lower plate.
The fixing part 2 of the detent X has a U-shaped cross section that opens downward, accommodates the upper end of the wheel support part C of the free caster inside, circumscribes the support part C, and is a free caster. This is a part for fixing the direction of the wheel F.
In this invention, a female screw is attached downward to the lower end of the support column so that the mounting bolt of the free caster can be attached and detached, the lower end of the female screw is projected, and the outer surface of the protruding portion is a polygonal column. When the non-rotating stopper has a square notch 5 as shown in FIG. 3, the polygonal column has a square cross section, and the protruding portion is shaped to fit exactly within the notch 5 of the non-rotating stopper.

  In the present invention, the free caster attached to the lower end of the support column is once removed, and the detent X as shown in FIG. 3 is brought into contact therewith, and the rectangular column at the lower end of the support column is fitted into the notch 5 of the detent. Next, the mounting bolt D of the universal caster is inserted into the through-hole 3 of the non-rotating, and the nut J of the universal caster is rotated to fit the mounting bolt D into the female thread of the column, thereby fixing the universal caster to the column.

Thus, when the rotation stopper X is interposed between the support column and the free caster and the free caster is fixed to the support column, the rotation stop cannot move relative to the support column because the support column is inserted into the notch. Fixed to state. Further, since the fixed part 2 circumscribes the wheel support part C of the free caster, the rotation of the wheel of the free caster cannot be changed. As a result, the universal caster can advance only in a certain direction.
Of the four free casters attached to the transport vehicle, when the anti-rotation X is attached to the two free casters arranged vertically or horizontally as described above, the transport vehicle can easily and reliably go straight. . For this reason, even if a heavy vehicle is placed on the vehicle or the road is inclined or uneven, the vehicle is prevented from traveling in an unexpected direction.

  Thus, according to the present invention, at least four struts having a mountain-shaped cross section are fixed around a right-angled quadrilateral flat plate, downward female screws are fixed to the lower ends of the respective struts, and mounting bolts for the free casters can be attached to and detached from the female screws. In the transport vehicle that can travel in either direction, the lower end of the female screw protrudes to make the outer surface of the protrusion a square column made of square, regular hexagon, or regular octagon, and a new detent is prepared. The stopper is provided with a fixing part for fixing the main body part of the free caster, a through hole of the mounting bolt for the free caster, and a notch for fitting the square pillar around the through hole. It is intended to provide a transport vehicle that is fixed between a support column and a free caster to facilitate straight travel.

  In this invention, since the downward female screw is fixed to the lower end of each strut, and the free caster is attached to the strut by fitting the mounting bolt of the free caster to the female screw, the free caster is detachable from the strut. On the other hand, since the shaft portion 1 is provided in the detent X and the through hole 3 is formed there, the detent can be freely used as a support by inserting the mounting bolt D for the free caster into the through hole and fitting it in the female screw. Can be easily fixed between casters.

  Further, since the notch 5 is provided in the rotation stopper X, the rotation stopper can be easily and surely fixed at a fixed position of the column by fitting the prism at the lower end of the column into the notch 5. Further, since the rotation stopper X is provided with a fixing portion, the direction of the wheel can be controlled to be constant by circumscribing the fixing portion to the wheel support portion C of the free caster. Thus, according to the present invention, the direction of the wheel can be easily and reliably restricted to a certain direction. Therefore, the transport vehicle can be easily moved straight.

The straight traveling direction when the cart is moved straight must be parallel to the sides of the right-angled quadrangular flat plate constituting the base plate of the cart, particularly the long side. In the present invention, since the pillar has a chevron cross section, the outer surface of the chevron constituting the pillar is naturally parallel to the side of the right quadrilateral. Therefore, by adjusting the relationship between the notch 5 and the pillars so that the direction in which the detent fixing part 2 faces is parallel to the outer surface of the angle pillars, the sides of the right quadrilateral can be easily and reliably adjusted. The carriage can be driven straight in parallel with
In particular, in this invention, the prism is made of square, regular hexagon or regular octagon, so that the direction of the free caster can be easily oriented parallel to the side of the flat plate by directing one surface of the prism parallel to one surface of the column. Can do.

  In this invention, since the thing with a cross-sectional cross section is used as a support | pillar, the direction which a mountain faces changes according to the attachment position to four plates of 4 support | pillars. However, since the prism provided on the support column has a square cross section, a regular hexagonal shape, or a regular octagonal shape, the shape of the prism does not change even if the direction of the mountain changes, so the same support column can be used. Therefore, it is economical because the transportation vehicle can be assembled with a reduced number of parts.

It is a perspective view of a well-known transport vehicle. It is a perspective view of a well-known universal caster. It is a perspective view of the rotation stopper used in this invention. It is the perspective view which showed the state when attaching a rotation stopper between the support | pillar of a transport vehicle and a universal caster by this invention. It is a top view of the other detent used in this invention.

In the present invention, it is necessary to prepare a new detent. Therefore, the detent plays an important role in the present invention. First, the rotation stop will be described.
The rotation stopper shown in FIG. 3 is provided with a square notch 5 in the shaft portion 1. The reason why the notches are square is that they fit into the prisms T projecting from the lower ends of the columns R as shown in FIG. In this case, as shown in FIG. 3, the wall surface 51 of the notch 5 is oriented parallel to the direction Z in which the fixing portion 2 extends, and on the other hand, in the column R, the outer surface of the prism T is as shown in FIG. If the detent X is attached to the support column R, the direction in which the fixing portion extends coincides with the direction in which the support column faces, so that the traveling direction of the wheel can be easily known. Therefore, the transport vehicle can be surely moved straight in the edge direction of the base plate, that is, the right-sided quadrilateral plate.

FIG. 5 is a plan view of a detent used when the prism column protruding from the lower end of the column R is a regular hexagonal column. Since the square column becomes a regular hexagonal column, it occurs when an ordinary nut is used for the internal thread, which is important.
When the prism is a regular hexagonal column, unlike the regular quadrangular prism or regular octagonal column, when the same column is used at the four corners, the direction in which the hexagonal column is directed depends on the direction of the mountain that constitutes the column. become. More specifically, the hexagonal pillars are not in the same shape between adjacent struts, but are rotated by an angle of 30 degrees.

Therefore, if a detent having the same regular hexagonal notch is fitted to adjacent struts, the directions of the fixing portions are different. In order to avoid this, two types of detents with different notch orientations must be prepared. However, it is cumbersome to prepare two types of detents and use them properly.
Therefore, in the present invention, the rotation stopper Y as shown in FIG. 5 is used. The rotation stopper Y shown in FIG. 5 differs from the rotation stopper X shown in FIG. 3 only in the shape of the notch. The notch of the non-rotating Y is notched along a regular hexagon, and the regular hexagon is overlapped along another regular hexagon that is rotated by an angle of 30 degrees with the center in the same position. A notch is made.

  In the rotation stopper Y shown in FIG. 5, it is desirable that the edge of one regular hexagonal cutout, that is, the wall surface 51 of the cutout, extends in parallel to the extending direction Z of the fixing portion 2. This is because, in this case, when the detent Y is fixed to the support column, the direction in which the wheel faces is easily matched with the outer surface of the support column, and accordingly, the transport vehicle is easily advanced in the direction toward the outer surface of the support column.

In addition, the rotation stopper Y of FIG. 5 fixes the upper board 4 which punched the notch 5 on the lower board provided with the axial part 1 and the fixing | fixed part 2 similarly to the rotation stopper X shown in FIG. It is made. In FIG. 5, 6 is a positioning hole, and 7 is a weld.
When the prism column protruding from the lower end of the support column is a regular octagonal column, the present invention can be carried out by providing a regular octagonal notch for the rotation stopper in exactly the same manner as when the square column cross section is a square.
According to the present invention, since the support column is provided with a rectangular column, a simple detent is prepared, and the simple attachment is provided, the transport vehicle can be moved straight forward easily. Is big.

P Top plate Q Bottom plate R Post S Swivel caster T Square column A Swivel caster main body B Cylindrical portion C Support portion D Mounting bolt E Substrate F Wheel G Axis H Ball X, Y Detent Z Extending direction of fixed portion 2 1 axis Part 2 Fixing part 3 Through hole 4 Upper plate 5 Notch 6 Positioning hole 7 Welded part

Claims (5)

  Fix at least four struts with a mountain cross-section around a right-angled quadrilateral plate, fix a downward female screw to the lower end of each strut, and detachable caster mounting bolts to the female screw in any direction. In addition, the lower end of the female screw is projected to form a square, regular hexagonal or regular octagonal prism, and a new detent is provided. A fixing portion for fixing the main body portion, a through hole of a mounting bolt for a free caster, and a notch for fitting the prisms around the through hole, and a detent as a post and a free caster. A transport vehicle characterized by being fixed between and making it easy to go straight.   2. The transport vehicle according to claim 1, wherein the rotation stopper is made by welding an upper plate having a notch punched to a lower plate having the fixing portion and the through hole.   A positioning hole and a positioning projection are provided between the lower plate and the upper plate, the positioning projection is fitted into the positioning hole, and is provided on the upper plate around a through hole provided in the lower plate. The transport vehicle according to claim 2, wherein the notch is securely positioned and welded to make a detent.   The transport vehicle according to any one of claims 1 to 3, wherein at least two of the outer surfaces constituting the prisms extend in parallel with one of the outer surfaces constituting the support column. .   When the prism is a regular hexagon, the notch provided in the rotation stopper is provided with a regular hexagonal notch and a regular hexagonal notch formed by rotating the hexagonal notch concentrically by an angle of 30 degrees. The transport vehicle according to any one of claims 1 to 4, wherein the transport vehicle has a shape.

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