JP3420742B2 - Casters for transporting heavy objects - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to carrying in and out of heavy loads such as large transformers, large machine tools, and heating and cooling equipment.
The present invention relates to a caster for transporting heavy goods used for installation and for transporting various articles in other various factories and construction sites.

[0002]

2. Description of the Related Art Conventionally, a carriage having traveling wheels attached to a pedestal has been used to carry various heavy goods, and various heavy goods are placed on the pedestal and moved together with the dolly. I am trying.

At this time, since the traveling wheels attached to the lower surface of the base portion can freely rotate in the horizontal direction, the traveling wheels can be freely rotated in the horizontal direction so that they are fixed to the lower surface of the carriage. Wheels are supported on a rotating base, and the direction of the wheels is changed and moved while matching the carrying direction.

[0004]

However, for example, various transformers, large machine tools, various factories that carry in and out heavy objects such as air-conditioning equipment, and the traveling surface on which a trolley is moved at a construction site are If the traveling surface is uneven or has steps, the traveling wheels may not rotate smoothly and may stop at these positions.

This is not set so that the elevation angle can be arbitrarily adjusted even if the rotation base can be freely rotated in the horizontal direction, and since it has a rigid structure, it causes unevenness on the running surface. This is because it does not follow, and in particular, even if there are slight irregularities, they cannot be overcome and they stop.

That is, when a wheel is fitted into the upper part of a concave surface such as a dent, the load of a load or the like is concentrated on the wheel,
It is extremely difficult to escape from there, and if a wheel gets caught in a wiring member protruding above the floor, for example, it will not be able to get over it and it will be impossible to move in the carrying direction. It was

[0007] In such a case, even if the stopped wheel portion is lifted and an attempt is made to escape, it must be lifted together with a heavy load, which is not only difficult, but also when the entire trolley is tilted, the load is not enough. There was a risk of slipping on the dolly.

Therefore, the present invention was created in view of the various existing conditions as described above, and the wheel cart is freely adjusted in elevation in accordance with the unevenness of the running surface, undulations, etc. To provide a caster for transporting a heavy object that can be smoothly and safely carried by rolling at an elevated angle along which the object can be easily and safely transported even if the object is a heavy object. With the goal.

[0009]

In order to solve the above-mentioned problems, in the present invention, a wheel support in which wheels 24a and 24b are supported on the lower surface of the caster base 10 fixed to the lower surface of the bogie base B. In a caster in which the body 12 is horizontally rotatably attached via bearing means 14, the wheel support 12 has a pair of holding bodies 15a, 1 on the lower surface.
5b is provided, and the support member 19 is rotatably supported between the holding bodies 15a and 15b, and is rotated on both sides of a support shaft 20 that is orthogonal to the rotation axis of the support member 19 on the same horizontal plane. It is composed of a pair of wheels 24a and 24b that are freely rotatably supported, and casters 25 that are arranged close to the pair of wheels 24a and 24b in the direction of the axis of rotation of the support member 19. The support shafts 20 of the wheels 24a and 24b are configured to be lifted up and down within a predetermined range with respect to the caster base 10 around the rotation axis. Bearing means 14
Is a radial bearing 14a and a radial bearing 14a in an opening 28 formed through the center portion of the caster base 10.
A stepped portion 28a for fitting and holding the outer ring of a is formed, and is fixed to a substantially central portion of the upper surface of the wheel support 12 to hold the inner ring of the radial bearing 14a housed in the opening 28 by the stepped head portion 30a. The bearing support 12 and the thrust bearing 14b arranged outside the radial bearing 14a and interposed between the lower surface of the caster base 10 and the upper surface of the wheel support 12 can be used. Further, the wheel support 12 is formed with an inclined surface corresponding to a predetermined depression / elevation angle on its lower surface so as to regulate the depression / elevation range of the pair of wheels 24a, 24b by abutting.

In the caster 1 for carrying a heavy load according to the present invention constructed as described above, the pair of wheels 24a is rotated by the rotation of the support member 19 pivotally supported by the holding members 15a and 15b on the lower surface of the wheel support 12. , 24b are tilted about the rotation axis with respect to the caster base 10 at a predetermined elevation angle. At this time, the pair of inclined wheels 24a, 2
The range of the elevation angle of 4b is set by the contact between the upper ends of the wheels 24a, 24b and the inclined surfaces 38a, 38b formed on the lower surface of the wheel support 12 at a predetermined elevation angle. Further, the bearing means 14 for allowing the caster base 10 to freely rotate in the horizontal direction is integrally formed by rotatably connecting the caster base 10 and the wheel support 12 via the radial bearing 14a and integrating them. Base 10
The weight of the transported object P is supported by the thrust bearing 14b interposed between the lower surface and the upper surface of the wheel support 12. By this, the pair of wheels 24a, 2 can be freely followed in the carrying direction.
Combined with the flexibility of 4b, it ensures a free orientation on the transportation and running surface.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. Reference numeral B shown in FIG. 1 is, for example, a dolly on which various kinds of goods P are placed and are carried. A caster for carrying heavy objects of the present invention (hereinafter referred to as caster unit 1) is arranged and fixed to a part of a wheel unit arranged at four corners of a bottom surface of the carriage B.

The trolley base portion B is capable of traveling in the direction of the arrow, for example, and the caster units 1 are disposed on both sides in the front in the traveling direction, and at the center thereof, for example, a universally operable caster 2 which can be operated remotely is disposed. Further, the other weight wheel units 3 and 3 are arranged on both sides in the rear.

That is, the caster unit 1 is shown in FIG.
As shown in FIG. 6, a wheel 2 to be described later is provided on the lower surface of the disk-shaped caster base 10 fixed to the lower surface of the bogie base B.
The wheel support 12 on which the wheels 4a and 24b are supported is mounted via a bearing 14 so as to be rotatable in the horizontal direction.

More specifically, the wheel support 12 is formed in a disk shape having a diameter smaller than that of the caster base 10, and a pair of holding bodies 15a, 15b are formed on the lower surface in a block shape.
Are supported via four bolts B1 and are fitted between the two holding bodies 15a and 15b so that the rotary shaft 17a,
A support member 19 rotatably supported by 17b, and a pair of wheels 24 rotatably supported on both sides of a support shaft 20 orthogonal to the rotation axis of the support member 19 on the same horizontal plane.
a, 24b, and a caster 25 arranged in the axial direction of the rotating shafts 17a, 17b of the support member 19 in the vicinity of the pair of wheels 24a, 24b, and pivotally supports the pair of wheels 24a, 24b. The support shaft 20 is the support member 1
It is configured such that the caster base 10 can be lifted up and down within a predetermined range around the rotation shafts 17a and 17b of the nine shafts.

The bearing means 14 is, as shown in FIG.
An opening 28 having a stepped portion 28a for fitting and holding the outer ring of the radial bearing 14a is penetratingly formed in the center portion of the radial bearing 14a and the caster base 10, and the opening 28 is supported by the stepped portion 28a and inside the opening 28. The pivot 30 as a bearing support fixed by a bolt B2 to a substantially central portion of the upper surface of the wheel support 12 so that the inner ring of the accommodated radial bearing 14a is inserted and held by the stepped head 30a, and the outside of the radial bearing 14a. And a thrust bearing 14b which is disposed between the lower surface of the caster base 10 and the upper surface of the wheel support body 12.

As shown in FIGS. 5 and 6, the wheel support 12
Has a protruding portion 32 of a predetermined width formed in the center of the lower surface thereof in a direction transverse to the center, and a concave groove 35 into which the upper end portion of the support member 19 is fitted is formed behind the protruding portion 32. Groove 35
Seating surfaces 37a and 37b for attaching the holding bodies 15a and 15b are provided in front and rear of the above. The low surfaces on both sides of the protruding portion 32 are formed as surfaces inclined downward toward each other, that is, inclined surfaces 38a and 38b corresponding to a predetermined depression / elevation angle. And, in front of the protruding portion 32, as shown in FIG.
Stepped seat surface 40 for mounting the caster 25 shown in FIG.
Are formed. Although the front and rear seat surfaces 37a and 37b are projectingly provided so as to form the recessed groove 35 therebetween, the seat surfaces 37a and 37b are formed independently of the recessed groove 35. Sometimes (not shown).

Next, the procedure for assembling the caster unit 1 which is a caster for carrying heavy objects will be described with reference to FIG.

First, both rotation shafts 17a, 1 of a support member 19 rotatably supporting a pair of wheels 24a, 24b on both sides.
The holding holes 15a and 15b are held by inserting the fitting hole H into the 7b. Next, the upper end of the support member 19 is inserted into the concave groove 35 at the rear of the protruding portion 32 so that a slight gap is formed, and both holding bodies 15a and 15b are seated on the bearing surface via four bolts B1. It adheres to 37a and 37b.

In this state, the support member 19 is supported by both the holders 15a and 15b, so that the caster base 10 can be raised and lowered within a predetermined range around the pivot shafts 17a and 17b. The wheels 24a, 24b on the support shaft 20 that rotates together with the support member 19 have a limited elevation angle due to contact with the inclined surfaces 38a, 38b on the lower surface of the wheel support 12.

Next, the thrust bearing 14b is fitted into the ring-shaped recessed groove 42b formed on the upper surface of the wheel support 12, and the thrust bearing 14b is inserted into the caster base 1.
The caster base 10 is supported on the upper surface of the wheel support 12 by being fitted into the ring-shaped recessed groove 42a formed on the bottom surface of the wheel support member 0.

Therefore, the opening 28 of the caster base 10 is formed.
With the radial bearing 14a inserted and the outer ring fitted and held by the stepped portion 28a, the pivot 30 is inserted through the inner ring of the radial bearing 14a, and the pivot 30 is attached to the upper surface of the wheel support 12 with four bolts B2. The inner ring of the radial bearing 14a is fixed through the stepped head portion 30a.
The caster base 10 and the wheel support 12 are connected via the radial bearing 14a.

Next, an example of use of the caster for carrying heavy objects of the present invention will be described. As shown in FIG. 1, for example, on the bottom surface of the bogie base B of a bogie for carrying various heavy and heavy goods P. The caster units 1 of the present invention are arranged on both sides in front of the carriage base B in the traveling direction as a part of the wheel units arranged at the four corners, and the traveling direction indicated by the arrow is relative to the caster base 10. It can be set by means of bearings 14 which allow it to pivot freely in the horizontal direction and, if necessary, the direction can be set by means of a centrally located remotely operable universal electric caster 2.

When the carriage base portion B travels, if there are undulations on the transport traveling surface, a pair of wheels 24a, 24 follow the undulations.
The support shaft 20 of b is tilted around the rotation shafts 17a and 17b so that it can be raised and lowered with respect to the caster base 10 within a predetermined range, and either of the wheels 24a and 24b can run following the undulating surface. .

This means that if there are undulations on the transport surface,
The support shaft 20 of the wheels 24a and 24b tilts along the undulations to rotate the wheels 24a and 24b following the undulation surface, so that the bogie itself can smoothly travel.

Further, even if the wheels 24a and 24b are fitted in the deep dents and the load is concentrated on either of the wheels 24a and 24b, the wheels 24a and 24b follow the guide of the caster 25 arranged in front and the inclined surface of the dents. The support shaft 20 is tilted, the wheels 24
Since the a and 24b are smoothly rotated, they can be easily escaped, and even if the wheels 24a and 24b are caught by the wiring members or the like arranged on the floor surface, the tilting of the support shaft 20 is similarly performed. Thus, the wheels 24a, 24b can smoothly rotate and get over them, and in addition to the fact that the horizontal state of the bogie base B is almost maintained, the bogie itself can smoothly run.

[0026]

Since the present invention is configured as described above, the pair of wheels 24a, 24a, 24a is rotated by the rotation of the support member 19 pivotally supported by the holders 15a, 15b on the lower surface of the wheel support 12.
The support shaft 20 of 24b can be tilted about the rotation shafts 17a and 17b with respect to the caster base 10 at a predetermined elevation angle, which allows the wheels 24 to move while the truck is running.
Even if a and 24b encounter undulations on the transport surface, they are freely adjusted in elevation according to the undulations, and by rolling at an elevation angle that conforms to the shape of the travel surface, they run smoothly and have a considerable weight. Even a transported article P having a certain amount can be transported easily and safely.

Further, the bearing means 14 can rotatably connect the caster base 10 and the wheel support 12 via the radial bearing 14a and integrate them, and at the same time, the lower surface of the caster base 10 and the upper surface of the wheel support 12 can be connected. A heavy load P can also be supported by the thrust bearing 14b interposed between the two, so that it can freely follow the carrying direction and, in combination with the liftability of the pair of wheels 24a, 24b. It is possible to secure free directionality on the running surface.

Further, the wheel support 12 includes one wheel 24.
When a or 24b is fitted in a deep dent, the wheel 24a or 24b abuts the inclined surfaces 38a, 38b and the elevation range is restricted, and the other wheel 24b or 2b.
4a can escape by rolling along the outside which is the side of the deep depression.

[Brief description of drawings]

FIG. 1 is a perspective view of a truck using a caster for carrying heavy objects according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a heavy load carrying caster according to an embodiment of the present invention, which is a cross-sectional view taken along the line AA of FIG.

FIG. 3 is likewise a bottom view of FIG.

FIG. 4 is likewise a plan view of FIG.

FIG. 5 is a sectional view taken along line BB of FIG.

FIG. 6 is likewise an exploded perspective view of a caster for carrying heavy objects.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Caster unit (caster for carrying heavy objects) 2 ... Universal electric caster 3 ... Wheel unit 10 for heavy weight ... Caster base 12 ... Wheel support 14 ... Bearing means 14a ...
Radial bearing 14b ... Thrust bearing 15a,
15b ... Holding bodies 17a, 17b ... Rotating shaft 19 ... Support member 20 ... Support shaft 24a,
24b ... Wheels 25 ... Casters 28 ... Openings 28a ... Stepped portions 30 ... Pivot 30a ... Stepped heads 32 ... Projected portions 35 ... Recessed grooves 37a,
37b ... Seating surfaces 38a, 38b ... Inclined surface 40 ... Seating surfaces 42a, 42b ... Recessed groove B ... Truck stand H ... Fitting hole P ... Transported goods B1, B2 ... Bolts

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B60B 33/00

Claims (3)

(57) [Claims] 1. A caster in which a wheel support having wheels supported on a lower surface of a caster base fixed to a lower surface of a bogie base is rotatably mounted in a horizontal direction via bearing means. The body is provided with a pair of holding bodies on its lower surface, and a support member rotatably supported between the holding bodies and both sides of a support shaft orthogonal to the rotation axis of the support member on the same horizontal plane. A pair of wheels that are rotatably supported by a pair of wheels, and casters that are arranged close to the pair of wheels in the direction of the rotation axis of the support member. The support member rotates to rotate the support shaft of the pair of wheels. A caster for carrying heavy objects, characterized in that the caster base can be raised and lowered around a moving axis within a predetermined range. 2. The bearing means includes a radial bearing and a stepped portion that fits and holds an outer ring of the radial bearing in an opening formed through the center portion of the caster base and is housed in the opening. A bearing support fixed to the upper surface of the wheel support to hold the inner ring with a stepped head, and a bearing support disposed outside the radial bearing and interposed between the lower surface of the caster base and the upper surface of the wheel support. The caster for carrying heavy objects according to claim 1, which is composed of a thrust bearing. 3. The weight according to claim 1, wherein the wheel support has a lower surface on which an inclined surface corresponding to a predetermined elevation angle is formed so as to restrict the elevation range of the pair of wheels by abutting. Casters for transporting goods.