JP4091830B2 - caster - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a caster of a type that is fixed by screwing a screw portion provided on an upper portion of a main shaft into a screw hole or a nut to be attached.
[0002]
[Prior art]
Conventionally, in a caster of a type that is fixed to an attachment target by screwing a screw portion provided on the upper part of the main shaft into a screw hole or a nut to be attached, a tool is hung directly on the upper plate of the main body that supports the wheel. A flat hexagonal portion is provided. When the caster is attached to the lower part of the attachment target, a dedicated flat spanner is hung on the hexagonal part, the main shaft is rotated, and the screw part is screwed into the screw hole to be attached. Since the hexagonal part of the spindle is located in a narrow space between the upper surface of the upper plate of the main body and the lower surface of the mounting target, the work space is limited and the spanner is flat and not easy to operate, etc. Therefore, there is a difficulty associated with the installation work of casters.
[0003]
[Problems to be solved by the invention]
Therefore, the present invention is a caster of a type that is fixed to an attachment target by screwing a screw portion provided on the upper part of the main shaft into a screw hole or a nut to be attached, and is easy to mount on the attachment target. The purpose is to provide things.
[0004]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, in the present invention, the main shaft 4 is protruded downward from the main body 3, a corner head 15 is formed at the lower end thereof, and an operation nut 17 is fitted non-rotatably thereto, With the configuration in which the nut 17 is fixed to the lower end of the main shaft 4 with the fixing bolt 18, the operation nut 17 is rotated from below the caster that is easy to operate, and the main shaft 4 is screwed into the attachment object A. The operation nut 17 is formed with a recess 17b in which the head portion 18a of the fixing bolt 18 is buried, and the head portion 18a of the fixing bolt 18 is formed with a square hole 18b for rotation operation. The caster 1 is prevented from being disassembled even if the 17 is rotated, and it is difficult to accidentally rotate the fixing bolt 18.
In addition, by disposing the obstacle pin 18c in the square hole 18b for engaging the wrench of the fixing bolt 18, the use of a general-purpose wrench is refused, and it is impossible to perform a rotation operation only with a dedicated tool, and an erroneous disassembly operation is performed. To prevent.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings. 1 is a sectional view of a caster, FIG. 2 is a front view of the caster, FIG. 3 is a rear view of the caster, FIG. 4 is a plan view of the caster, FIG. 5 is a bottom view of the caster, FIG. Is an exploded perspective view of the caster, FIG. 8 is a plan view of the caster body, and FIG. 9 is a sectional view of the caster body.
[0006]
1 to 7, the caster 1 includes a wheel 2, a main body 3 that pivotally supports the wheel 2, and a main shaft 4 that vertically penetrates the main body 3.
[0007]
The main body 3 is made of aluminum or aluminum alloy, and a bearing block 7 that vertically penetrates the main shaft 4 via bearings 5 and 6, and extends obliquely downward from the bearing block 7. And a pair of legs 8 supporting the. The bearing block 7 has a vertical shaft hole 9. The shaft hole 9 is provided with large-diameter portions 9a and 9b for receiving bearings at the upper and lower portions, and an inner peripheral flange 9c is formed between the upper and lower large-diameter portions 9a and 9b. On the inner periphery of the flange 9c, a pair of vertical grooves 9d are formed in the opposing portion. A thrust bearing 5 is inserted into the large diameter portion 9a, and a conical roller bearing 6 is inserted into the large diameter portion 9b.
[0008]
The main shaft 4 is supported by the shaft hole 9 so as to be rotatable relative to the main body 3 around the axis. The main shaft 4 has a mounting screw part 10, a flange 11, a large diameter part 12, a step part 13, a small diameter part 14, and a square head part 15 in order from the top. The main shaft 4 is formed with a screw hole 16 extending upward from the center of the lower end of the corner head 15 along the axis. A square hole 20 for rotating operation is formed at the upper end of the main shaft 4.
[0009]
An outer ring of the bearing 5 is disposed on the inner peripheral flange 9c of the shaft hole 9, and an outer ring of the bearing 6 is disposed below the inner peripheral flange 7b. The main shaft 4 is inserted into the shaft hole 9 so that the flange 11 is placed on the inner ring of the bearing 5 and the stepped portion 13 is placed on the upper surface of the inner ring of the bearing 6, and the square head 15 protrudes below the bearing block 7. Incorporated into the main body 3
[0010]
An operation nut 17 is fitted to the angular head 15 of the main shaft 4 projecting downward from the bearing block 7. A cover ring 19 is attached to the main shaft 4 by an operation nut 17 so as to cover the lower surface of the bearing 6. In the fitted state, the upper end of the operation nut 17 contacts the lower end of the inner ring of the bearing 6. The operation nut 17 has an outer peripheral square shape, and has a square hole 17a fitted to the corner head 15 at an upper center portion, and a circular recess 17b having a larger diameter than the square hole 17a. The recess 17b is open downward.
[0011]
A fixing bolt 18 is screwed into the screw hole 16 of the main shaft 4 via an operation nut 17. The circular head 18a of the fixing bolt 18 has a square hole 18b for rotational operation, and is buried in the recess 17b of the operation nut 17 at the time of screwing. In the center of the square hole 18b, an obstacle pin 18c for rejecting the use of a general-purpose wrench is provided. Therefore, the fixing bolt 18 is hidden in a position that cannot be seen in the use state. The operation nut 17 is fixed to the main shaft 4 by a fixing bolt 18 and is pressed against the lower surface of the inner ring of the bearing 6.
[0012]
As described above, the main shaft 4 is supported by the main body 3 so as to be rotatable around the shaft with the bearing block 7 interposed between the flange 11 and the operation nut 17. When the main shaft 4 is directly screwed to the mounting object A or screwed with a fixing nut, the main shaft 4 is rotated by applying a spanner to the operation nut 17. The spindle 4 can also be rotated from the attachment target A side by putting a tool on the square hole 20 at the upper end thereof. Since the operation nut 17 is not screwed to the main shaft 4, there is no possibility that the caster 1 is disassembled by rotating the nut 17. Further, since the fixing bolt 18 is not visible in the use state, there is no possibility that the user will operate it by mistake. Even if this is to be operated, the obstacle pin 18c is present in the square hole 18b, so that it cannot be rotated with a general-purpose hexagon wrench, and therefore there is no possibility of inadvertently disassembling the caster.
[0013]
【The invention's effect】
As described above, in the present invention, the main shaft 4 protrudes downward from the main body 3, the corner head 15 is provided at the lower end portion thereof, the operation nut 17 is fitted thereto, and this is further fixed to the fixing bolt 18. Since the head 18a with the square hole 18b of the fixing bolt 18 is buried in the recess 17b of the operation nut 17, the mounting screw portion 10 on the upper portion of the main shaft 4 is attached to the mounting target A. When screwing in, in the work space with a relatively large degree of freedom below the main body 3, the tool can be rotated on the operation nut 17, and tightened quickly using a general tool in a wide work space. Work can be completed. Further, since the mounting nut 17 for the main shaft 4 and the fixing bolt 18 for mounting the main shaft 4 are separate and the fixing bolt 18 is hidden, there is no possibility that the caster 1 is accidentally disassembled during the mounting operation. Has an effect.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a caster.
FIG. 2 is a front view of a caster.
FIG. 3 is a rear view of the caster.
FIG. 4 is a plan view of a caster.
FIG. 5 is a bottom view of a caster.
FIG. 6 is a side view of a caster.
FIG. 7 is an exploded perspective view of a caster.
FIG. 8 is a plan view of a caster body.
FIG. 9 is a cross-sectional view of a caster body.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Caster 2 Wheel 3 Main body 4 Main shaft 5 Bearing 6 Bearing 7 Bearing block 8 Leg part 9 Shaft hole 9a Large diameter part 9b Large diameter part 9c Inner peripheral flange 9d Groove 10 Screw part 11 Girder part 12 Large diameter part 13 Step part 14 Small diameter Part 15 Square head 16 Screw hole 17 Operation nut 17a Square hole 17b Circular recess 18 Fixing bolt 18a Head 18b Square hole 18c Obstacle pin 19 Cover 20 Square hole A Installation target

Claims (2)

A caster comprising a wheel, a main body that pivotally supports the wheel, and a main shaft that vertically passes through the main body and is mounted so as to be relatively rotatable about the axis with respect to the main body and has a mounting screw portion protruding above the main body. In
The main shaft is located below the mounting screw portion and is in contact with the upper surface of the main body so as to be relatively rotatable around the shaft, a corner head projecting downward from the main body, and a lower end of the corner head A screw hole extending upward along the axis from the center,
A main shaft operating nut whose upper part is non-rotatably fitted to the angular head of the main shaft, and a fixing bolt screwed into the screw hole of the main shaft via the main shaft operating nut in order to fix the main shaft operating nut to the main shaft And
The main shaft operating nut has a square hole portion through which the shaft portion of the fixing bolt penetrates and fits into a corner head portion of the main shaft, and a receiving recess for receiving the head portion of the fixing bolt at the lower portion. ,
The head of the fixing bolt has a square hole for wrench engagement, and is configured to be buried in a receiving recess of the spindle operation nut,
A caster characterized in that the main body is sandwiched between the collar portion and the main shaft operating nut so as to be relatively rotatable around an axis, and is tightened up and down with the fixing bolt. The caster according to claim 1, wherein an obstacle pin for rejecting the use of a general-purpose wrench is protruded in a square hole for engaging the wrench of the fixing bolt.

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