JP3341874B2 - Wheel mounting structure on trolley - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a wheel unit comprising a wheel unit having idle wheels and a mounting member inserted into a lower end opening of a round pipe erected at four corners of a bogie. And a wheel attaching structure to a bogie for attaching to a lower end opening of a round pipe.

[0002]

2. Description of the Related Art As described above, when a mounting member of a wheel unit is inserted into a lower end opening of a round pipe to mount the wheel unit, when the mounting member of the wheel unit relatively rotates with respect to the round pipe, the wheel is mounted. Since the mounting of the unit becomes unstable, it is necessary to prevent the relative rotation in some way. Therefore, conventionally, a through hole has been formed between the round pipe and the mounting member, and a split pin or the like has been inserted into the through hole to prevent relative rotation between the two.

[0003]

However, in such a conventional structure, a through hole must be formed in the round pipe and the mounting member of the wheel unit. An extra process for drilling is required, and when installing the wheel unit, it is necessary to insert the cotter pin etc. by matching the through hole of the round pipe with the through hole of the mounting member. However, there is a disadvantage that the manufacturing cost is increased.

The present invention focuses on such drawbacks of the prior art. It is an object of the present invention to provide a method for mounting a round pipe and a wheel unit without forming a through hole for a split pin or the like in a mounting member of a wheel unit. An object of the present invention is to provide a wheel mounting structure for a bogie that can reliably prevent relative rotation with a member and can stably mount a wheel unit to a lower end opening of a round pipe.

[0005]

According to the first aspect of the present invention, a deformed portion is provided at the base of a mounting member of a wheel unit, and a deformed hole to be fitted with the deformed portion is provided. The regulating members provided at both ends are provided with two
Positioned so as to correspond to the lower end opening of the round pipe of the book,
In the state where the deformed portion of the wheel unit is fitted into the deformed hole of the regulating member, the mounting member of the wheel unit is inserted into the lower end opening of the round pipe to mount the wheel unit. The relative rotation of the wheel unit mounting member with respect to the round pipe can be reliably prevented by fitting with the deformed portion at the base.

Therefore, although a regulating member having a deformed hole is required, a step of forming a through hole for a split pin or the like in a round pipe or a mounting member as in the prior art is not required, and a wheel is not required. When installing the unit, the troublesome work of inserting the split pin etc. by matching the through hole of the round pipe with the through hole of the mounting member is unnecessary,
Costs can be reduced as a whole. Moreover,
Since the relative rotation of the wheel unit mounting member is prevented by fitting the deformed portion and the deformed hole, the relative rotation is more reliably prevented than when blocked by a split pin, etc. Even if it acts, there is little risk of breakage, and it can be used for many months.

According to the second aspect of the invention, a wheel mounting socket is inserted and fixed in the lower end opening of the round pipe,
In this case, the mounting member of the wheel unit is passed through the through hole of the socket, and a retaining member is attached to a protruding portion of the mounting member from the through hole to prevent the wheel unit from falling off. Thus, even if the truck is lifted significantly upward, the wheel unit does not fall off from the lower end opening of the round pipe, and is convenient and convenient in actual use.

According to the third aspect of the present invention, the socket for mounting the wheel has a concave groove on the outer periphery thereof, and the socket is connected to the lower end of the round pipe via an O-ring fitted into the concave groove. Since it is fixed in the opening, the wheel mounting socket can be fixed in the lower end opening of the round pipe without special processing etc. on the round pipe side, and the manufacturing error of the inner diameter of the round pipe Can be absorbed by deformation of the O-ring. In other words, when the bogie-side round pipe is a commercially available pipe material, a certain manufacturing error is recognized in the inner diameter, and thus there is some variation. However, since the variation in the inner diameter can be absorbed by the deformation of the O-ring, even if there is some variation in the inner diameter of the round pipe, the wheel mounting socket can be securely fixed in the lower end opening of the round pipe. It is possible to more reliably prevent the wheel unit from falling off the round pipe.

According to the fourth aspect of the present invention, since the wheel unit is not a caster type free wheel unit but a fixed wheel unit, the function of the fixed wheel unit can be sufficiently exhibited. In other words, in the case of the caster-type free wheel unit, since the original function is to be able to freely change the direction of the idler wheel, the mounting member of the wheel unit is slightly rotated relative to the round pipe. Does not matter too much. However, in the case of a fixed wheel unit, it is necessary to keep the direction of the idle wheel constant at all times, and the relative rotation of such a fixed wheel unit is reliably prevented by fitting the deformed portion and the deformed hole. In this state, it is attached to the opening at the lower end of the round pipe, so that the idler wheel of the fixed wheel unit can always be held in a fixed direction, and it is possible to fully use the original function and use it. it can.

According to the fifth aspect of the present invention, the regulating member having the deformed hole is made of a pipe material, and both ends of the pipe material are crushed flat, and the deformed hole is formed in the crushed flat portion. Since the restricting member is formed to penetrate, the restricting member can be made durable for a light weight, and furthermore, by forming a penetrating hole that fits with the deformed part on the wheel unit side, the formation of the deformed hole is also reduced. It is also easy, and the regulating member itself can be manufactured at low cost using a commercially available pipe material. Although both ends are flat, the whole is pipe-shaped, so that even if the user's foot abuts on this restricting member when using a bogie, the whole is safer than a flat one. The same applies to the case of collision with another object.

According to the sixth aspect of the present invention, the bogie has a rectangular planar shape, and the regulating member is located between the two round pipes located on the short side of the rectangle. This restricting member can be shortened as compared with the case where it is located between two round pipes located on the side, which is advantageous in terms of material used, and can reduce the weight. Further, in a case where the caster-type free wheel units are attached to all four round pipes in the existing bogie, the free wheel units of the two round pipes located on the short side are replaced with fixed wheel units. Thus, a bogie having a free wheel unit on one short side and a fixed wheel unit on the other short side can be used in a state of good mobile steering.

According to the invention described in claim 7, the fixed wheel unit is attached to the lower end openings of two round pipes located on one short side of the two short sides of the rectangular carriage, and Since the free wheel unit is attached to the lower end openings of the two round pipes located on the short sides of the cart, as described above, the cart can be conveniently used with good operability. .

[0013] Claim 1 which has the above-mentioned functions and effects.
The present invention described in Nos. 1 to 7 can be carried out not only at the time of attachment to a newly manufactured bogie, but also with existing bogies and fixed shelves. That is, in the existing bogie,
If the wheel unit is broken and replaced with a new wheel unit, of course, if a caster type free wheel unit is installed and part of it is replaced with a fixed wheel unit, or if the lower end opening of a round pipe The present invention can also be applied to a case where the user wants to use the fixed shelf as a trolley in a fixed shelf having an installation stand or the like attached to the section.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a wheel mounting structure for a bogie according to the present invention will be described with reference to the drawings. FIG. 1 shows a hand-held trolley 1. The trolley 1 has a rectangular planar shape, and four round pipes 2 are erected at its four corners.
On the round pipe 2 of the book, a shelf 3 is arranged over a plurality of upper and lower stages. The shelf 3 has a structure in which a large number of wires are assembled and connected by welding, and is fixedly supported on each round pipe 2 via cylindrical connecting tools 4 provided at four corners thereof. A wheel unit 5 is attached to the lower ends of the four round pipes 2, and a handle 6 for hand pushing is fixed between the upper end openings of the two round pipes 2 located on the short sides. Have been.

As shown in FIGS. 2 and 3, the wheel unit 5 includes a free wheel 7 that rotates in contact with the floor surface and a rod-shaped mounting member 8 that can be inserted into the lower end opening of the round pipe 2. The caster-type free wheel unit 5a shown in FIG.
And a fixed wheel unit 5b shown in FIG. 2 in which the direction of the idler wheel 7 is fixed. Of these free wheel unit 5a and fixed wheel unit 5b, a square square shaft 9 acting as a deformed portion is integrally formed at the base of the mounting member 8 of the fixed wheel unit 5b. When the fixed wheel unit 5b is attached to the opening at the lower end of the round pipe 2, the angular axis 9 prevents and restricts the relative rotation of the fixed wheel unit 5b with respect to the round pipe 2. A bracket 10 is used as a working regulating member.

As shown in FIG. 2, the bracket 10 is formed from a commercially available round pipe material, and only its both ends are squashed flat and bent upward, and are bent into a flat portion bent upward. A square hole 11 as a deformed hole into which the square shaft 9 is fitted is bored vertically. This bracket 10 has square holes 11 at both ends located on the short side.
In a state where the square shaft 9 of the fixed wheel unit 5b is fitted into each of the square holes 11, the mounting member 8 is formed in a length that can be positioned corresponding to the lower end opening of the round pipe 2.
Is configured to be insertable into the lower end opening of the round pipe 2. As shown in FIG. 1, a bracket 10 is provided at the lower end openings of the two round pipes 2 on the shorter side of the rectangular carriage 1 to which the handle 6 is not attached.
The free wheel unit 5a is directly attached to the fixed wheel unit 5b via the lower end openings of the two round pipes 2 located on the other short side.

Sockets 12 for preventing the wheel units 5a and 5b from falling off from the round pipe 2 are inserted and fixed in the lower end openings of the four round pipes 2. The socket 12 is used commonly for the free wheel unit 5a and the fixed wheel unit 5b. As shown in FIG. 4, a main body 12a having an outer diameter smaller than the inner diameter of the round pipe 2 and a round pipe 12 And a flange 12b having an outer diameter substantially matching the outer diameter of the main body 2 and two recessed grooves 13 formed in the outer peripheral portion of the main body 12a. The recessed groove 13 is for fitting an O-ring 14 made of an elastic member such as rubber. The O-ring 14 has an outer diameter larger than the inner diameter of the round pipe 2. By inserting the socket 12 into the lower end opening of the round pipe 2 with the fitting 14 inserted, the socket 12 is fixed and held in the lower end opening of the round pipe 2 by the frictional force between the O-ring 14 and the round pipe 2. It is configured to:

The main body 12a and the flange 12b of the socket 12
A through hole 15 for inserting the mounting member 8 of each of the wheel units 5a, 5b is formed along the axial direction, and near the tip of the mounting member 8 of each of the wheel units 5a, 5b, A groove 17 for inserting a spring ring 16 formed from a round bar as a retaining member is formed. Therefore, the fixed wheel unit 5b is connected to the round pipe 2
In order to attach to the lower end opening of the bracket 10, the square shaft 9 is fitted into the square hole 11 of the bracket 10,
After the spring ring 16 is inserted into the groove 17 or the spring ring 16 is inserted into the groove 17 of the mounting member 8,
The square hole 11 of the bracket 10 is externally fitted to the square shaft 9, and then the socket 12 is externally fitted to the mounting member 8. With the external fitting of the socket 12, the spring ring 16
Is reduced in diameter to allow the passage of the socket 12, and thereafter the spring ring 16 returns to the original diameter, and the socket 12 externally fitted to the mounting member 8 is inserted into the lower end opening of the round pipe 2. As a result, the socket 12 is fixed in the lower end opening of the round pipe 2 by the O-ring 14 as described above, and each fixed wheel unit 5b rotates relative to the round pipe 2 by fitting the square shaft 9 and the square hole 11. And is prevented from falling off by the spring ring 16.

On the other hand, in the free wheel unit 5a,
Groove 1 of mounting member 8 without using bracket 10
The spring ring 16 is inserted into the connector 7, the socket 12 is fitted to the mounting member 8, and the socket 12 is inserted into the lower end opening of the round pipe 2. Then, the socket 12 is fixed in the opening at the lower end of the round pipe 2 by the O-ring 14 to prevent the socket 12 from falling off, and the relative rotation of the mounting member 8 in the through hole 15 of the socket 12 causes the free wheel unit 5 a Is a state in which the direction of the idler wheel 7 is freely changed about the mounting member 8, and each round pipe 2
It is attached to the lower end opening.

Reference numeral 18 in the drawing denotes a protective rotating body rotatably fitted near the lower end of each round pipe 2. The free wheel unit 5 a and the fixed wheel unit 5 b are connected to the lower end opening of the round pipe 2. Before being attached to the round pipes, they are attached to the respective round pipes 2 by external fitting. When the free wheel unit 5a or the fixed wheel unit 5b is about to come into contact with the wall when the carriage 1 moves near the wall or the like, the rotating body 18 comes into contact with the wall and rotates before the free wheel unit 5a or the fixed wheel unit 5b comes into contact.
a, 5b and walls are prevented from being damaged.

[Alternative Embodiment] In the above-described embodiment, the bracket 10 is formed of a pipe material. However, the bracket 10 can be formed of various materials such as a plate material and a rod material.
The shape can also be changed appropriately. Although the length of the bracket 10 is shown to correspond to the shorter side of the rectangular carriage 1, it can be set to a length corresponding to the longer side.
Furthermore, the bracket 10 can be divided into two parts so as to be relatively slidable, and the length can be changed by the relative sliding.

Deformed holes 1 formed at both ends of bracket 10
1 can also be a recessed hole other than the through hole penetrating in the vertical direction as in the previous embodiment, and the shape thereof can be a polygon other than a square, a triangle, a pentagon or more, or a half. Various shapes such as a circle are possible. In short, the deformed hole 11 and the deformed portion 9 on the wheel unit 5a, 5b side may have any shape as long as the relative rotation can be prevented by fitting the two.

Further, in the above-described embodiment, only the example in which the bracket 10 is used as the regulating member when the fixed wheel unit 5b is attached to the lower end opening of the round pipe 2 is shown, but the free wheel unit 5a is attached. In this case, the bracket 10 can be used.
That is, the free wheel unit 5a shown in the previous embodiment
Is a structure in which the mounting member 8 is relatively rotated with respect to the through hole 15 of the socket 12, and the direction of the idler wheel 7 is changed by the relative rotation of the mounting member 8 with respect to the through hole 15. However, as the free wheel unit 5a, in addition to the above-described structure, the mounting member 8 is kept fixed and the free wheel unit 5a is rotated about the axis of the mounting member 8 or the axis parallel to the axis of the mounting member 8. There is also a structure in which the direction of the rolling wheel 7 is changed. In the free wheel unit 5a having such a structure,
Like the fixed wheel unit 5b shown in the previous embodiment,
The free wheel unit 5a can be mounted on the lower end opening of each round pipe 2 in a state where the relative rotation of the mounting member 8 with respect to the round pipe 2 is prevented by using the bracket 10.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an entire cart.

FIG. 2 is an exploded perspective view of a fixed wheel unit.

FIG. 3 is an exploded perspective view of a free wheel unit.

FIG. 4 is a sectional view showing a mounted state of the wheel unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cart 2 Round pipe 5 Wheel unit 5a Free wheel unit 5b Fixed wheel unit 7 Idler wheel 8 Attachment member 9 Deformed part 10 Restriction member 11 Deformed hole 12 Socket 13 Recessed groove 14 O ring 15 Through hole 16 Retaining member

Claims (7)

(57) [Claims] An idler wheel (7) and a mounting member (8) are provided at the lower end opening of a round pipe (2) erected at four corners of a cart (1).
The wheel mounting structure for a bogie to which the mounting member (8) of the wheel unit (5) having the following is inserted, and the wheel unit (5) is mounted on a lower end opening of the round pipe (2), A regulating member (10) provided with a deformed portion (9) at the base of a mounting member (8) of the wheel unit (5), and a deformed hole (11) fitted to the deformed portion (9) at both ends. The deformed hole (11) is positioned so as to correspond to the lower end openings of the two round pipes (2), and the deformed portion (9) of the wheel unit (5) is moved to the deformed hole (11) of the regulating member (10). With the fitting member (8) inserted into the round pipe (2),
Wheel mounting structure for a bogie to which the wheel unit (5) is inserted by being inserted into a lower end opening of the vehicle. 2. A wheel mounting socket (12) is inserted and fixed in a lower end opening of the round pipe (2), and the wheel unit (5) is mounted in a through hole (15) of the socket (12). The member (8) is penetrated, and a retaining member (16) is attached to a protruding portion of the attachment member (8) from the through hole (15), so that the round pipe (2) of the wheel unit (5) is inserted. The structure for mounting a wheel to a bogie according to claim 1, wherein the wheel is prevented from falling off. 3. The socket (12) is provided with a concave groove (13) on an outer peripheral portion thereof, and the socket (12) is rounded through an O-ring (14) fitted into the concave groove (13). 3. The wheel mounting structure for a bogie according to claim 2, wherein the wheel is fixed in an opening at a lower end of the pipe (2). 4. The wheel mounting structure for a truck according to claim 2, wherein the wheel unit (5) is a fixed wheel unit (5b). 5. The regulating member (10) is made of a pipe material, and both ends of the pipe material are crushed flat, and the deformed hole (11) is formed through the crushed flat part. The wheel mounting structure to the bogie described in 2, 3, or 4. 6. The cart (1) has a rectangular planar shape,
The wheel mounting structure according to claim 1, 2, 3, 4, or 5, wherein the regulating member (10) is located between two round pipes (2) located on the short side of the rectangle. 7. A fixed wheel unit (5b) is attached to a lower end opening of two round pipes (2) located on one short side of the two short sides of the cart (1), and The wheel mounting structure for a bogie according to claim 6, wherein the free wheel unit (5a) is mounted on the lower end openings of the two round pipes (2) located on the short sides.