JPS6181203A - Double wheel type caster - Google Patents

Abstract

PURPOSE:To reduce the inner and outer wheel differences of a wheel when a caster is turned and improve running and durability by subdividing the number of wheels inserted in a car shaft into arbitrarily two or more wheels and individually rotate the divided wheels. CONSTITUTION:Two or more wheels 4, 4' and 5, 5' are independently inserted in a car shaft 7 so as to freely be rotated. In addition, the car shaft 7 is provided with the mounting seat 2 of a caster and the mounting seat 2 is freely rotated by a rotary mechanism section 3. For example, assume that the caster is turned with the wheel 4 at the center, the inner and outer wheel differences of the wheel 4', those of the wheel 5, and those of the wheel 5' are represented in r4-r3, r6-r5, and r8-r7, respectively. In this case, if the wheels 5, 5' are integrated, the inner and outer wheel differences are represented in r8-r5. As a result, the comparison of the inner and outer wheel differences when the wheel is divided and integrated is represented in r8-r5>r8-r7, and for the subdivision of the wheel, the inner and outer wheel differences can be reduced when the caster is turned.

Description

【発明の詳細な説明】 〔発明の利用分野〕 本発明は重い装置に使用するキャスタに係り特に装置の
小形化のため、低床式キャスタの採用、および装置移動
性の向上を要求される場合に好適なキャスタ構造に関す
るものである。[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to casters used for heavy equipment, and particularly when it is required to use low-floor casters and improve equipment mobility in order to downsize the equipment. The present invention relates to a caster structure suitable for.

〔発明の背景〕[Background of the invention]

従来の双輪型キャスタは第１図に示すごとく車軸７に挿
入された車輪Ａ１と車輪Ｂ　１’の２車輪と回転自在な
取付座２から構成されている。As shown in FIG. 1, a conventional twin-wheel caster is comprised of two wheels, a wheel A1 and a wheel B1', inserted into an axle 7, and a rotatable mounting seat 2.

第２図はキャスタの旋回時の状態を示した平面視図であ
り旋回時は一方の車輪Ａ１の回転中心６を軸に他車輪Ｂ
ｌ’が二点鎖線のごとく旋回するものである。ここでｒ
、、ｒｌはそれぞれ車輪Ｂ１′の内側、外側の回転半径
を示す。ここでキャスタに加わる荷重が大きくなると、
キャスタは車輪径を大きくする。または車輪幅を大きく
する等の方法により耐荷重向上を図る必要があった。前
記の車輪径を大きくする場合は、キャスタ取付高さが高
くなり装置の小形化には不利になる欠点があった。また
取付高さを変えないで車輪幅を広げる場合は、第２図に
示すごとく回転半径ｒ、、ｒ２の差（内外輪差）が大き
くなるため内外輪の回転速度差が大きくなり、車輪外側
は床面をすべるようになる。この結果、旋回時のキャス
タの旋回抵抗が大きくなる（装置始動荷重大）、また、
車輪の摩耗量も大きくなるという問題があった。従来の
双輪型キャスタの構造については公知例として特公昭５
３−１３８６６号公報キャスタの例がある。FIG. 2 is a plan view showing the state of the caster when it is turning, and when turning, the other wheel B is centered around the rotation center 6 of one wheel A1.
l' rotates as shown by the two-dot chain line. Here r
, , rl indicate the inner and outer turning radii of the wheel B1', respectively. If the load applied to the caster increases,
Casters increase the wheel diameter. Alternatively, it was necessary to improve the load capacity by increasing the width of the wheels. Increasing the diameter of the wheels described above has the disadvantage that the height at which the casters are mounted becomes high, which is disadvantageous for downsizing the device. In addition, when increasing the wheel width without changing the mounting height, as shown in Figure 2, the difference in the rotational radii r, , r2 (difference between the inner and outer rings) increases, so the difference in rotational speed between the inner and outer rings increases, and the outer begins to slide on the floor. As a result, the turning resistance of the casters increases when turning (large device starting load), and
There was also the problem that the amount of wear on the wheels increased. Regarding the structure of conventional twin-wheeled casters, a publicly known example is the Japanese Patent Publication No. 5
There is an example of a caster disclosed in No. 3-13866.

〔発明の目的〕[Purpose of the invention]

本発明は前述のごとき従来の問題点を改善するものであ
り、キャスタ取付高さが低く、また耐荷重も大きく、か
つ旋回、走行性能が良く耐久性にも富む双輪キャスタを
提供することにある。The present invention is intended to improve the conventional problems as described above, and an object of the present invention is to provide twin-wheeled casters that have a low caster mounting height, a large load capacity, good turning and running performance, and are highly durable. .

〔発明の概要〕[Summary of the invention]

本発明は、装置を小形化するため、取付高さが低く、耐
荷重大で走行性能も良いというキャスタを選定するため
市販品を評価した結果、市販品キャスタでは車輪幅が狭
くＰタイル上を走行した場合、集中荷重が加わりＰタイ
ルを破損することがわかった。対策として車輪幅を広く
する方法を実施したが、その場合、旋回時の車輪の内外
輪差が大きくなり装置の始動抵抗が大きくなって移動性
が低下した。そこで、車輪を細分割化し、内外輪差を小
さくすることにより上記目的に合致するキャスタを製作
することができた。In order to downsize the device, the present invention evaluated commercially available casters to select casters that have a low mounting height, high load capacity, and good running performance. It was found that if this happens, a concentrated load will be applied and the P tile will be damaged. As a countermeasure, a method was implemented to widen the wheel width, but in that case, the difference between the inner and outer wheels during turning became larger, increasing the starting resistance of the device and reducing mobility. Therefore, by subdividing the wheel and reducing the difference between the inner and outer wheels, we were able to manufacture a caster that met the above objective.

以下、本発明の実施例を第３図、第４図により説明する
。第３図は本発明の斜視図であり車軸８に各々独立して
回転自在に車輪Ｃ４，車輪Ｄ　４’、車輪Ｅ５、車輪Ｆ
　５’が挿入されている。Embodiments of the present invention will be described below with reference to FIGS. 3 and 4. FIG. 3 is a perspective view of the present invention, in which wheels C4, D4', E5, and F are independently rotatable on the axle 8.
5' is inserted.

また、車軸７にはキャスタの取付座２が設けられ、取付
座２は回転機構部３により回転自在となっている。第４
図は第３図の平面視図を示したものである。装置に取付
けられたキャスタが旋回する場合、たとえば車輪ｃ４を
中心に旋回する場合は車輪Ｄ　４’の内外輪差はｒ４−
ｒａ、車輪Ｅ５の内外輪差は’６　　’ＩＩｓ車輪Ｆ　
５’の内外輪差は’８　　ｒ７であられされる。ここで
、車輪Ｅ５、車輪Ｆダが一体の場合、旋回時の内外輪差
はｒｓ−ｒ６であられされる。ゆえに車輪を分割した場
合と一体の場合の内外輪差の比較はｒ、　−ｒ５　＞ｒ
ａ−ｒｑとなり、あきらかに車輪の細分割は旋回時の内
外輪差を小さくすることを可能とし、旋回時の車輪の動
きをスムーズにする。Further, the axle 7 is provided with a caster mounting seat 2, and the mounting seat 2 is rotatable by a rotation mechanism section 3. Fourth
The figure shows a plan view of FIG. 3. When the casters attached to the device turn, for example, when turning around wheel c4, the difference between the inner and outer wheels of wheel D4' is r4-
ra, the difference between the inner and outer wheels of wheel E5 is '6' IIs wheel F
The difference between the inner and outer rings of 5' is 8 r7. Here, when the wheel E5 and the wheel Fda are integrated, the difference between the inner and outer wheels during turning is expressed as rs-r6. Therefore, the comparison of the difference between the inner and outer wheels when the wheels are divided and when they are integrated is r, −r5 > r
Obviously, subdivision of the wheels makes it possible to reduce the difference between the inner and outer wheels when turning, and makes the movement of the wheels smoother when turning.

本実施例によれば、車輪を分割することにょ、　３　。According to this embodiment, by dividing the wheel, 3.

す、キャスタの旋回時の車輪の内外輪差を小さくするこ
とができるため、 （１）　　旋回時の車輪のすべりが少なくなり、旋回抵
抗が小さくなる。ゆえに装置の始動荷重も小さくなり装
置の走行性が良くなる。Since the difference between the inner and outer wheels when the caster turns can be reduced, (1) the slippage of the wheels when turning is reduced, and the turning resistance is reduced; Therefore, the starting load of the device is also reduced, and the running performance of the device is improved.

（２）　　車輪のすべりによる車輪の摩耗が少なくなり
、キャスタの耐久性が向上する。(2) Wheel wear due to wheel slipping is reduced, and caster durability is improved.

第５図は本発明の応用実施例を示すものであり、車輪分
割数を任意のｎ個としたもので、本応用例においても前
記実施例と同様な効果を得ることができる。FIG. 5 shows an applied embodiment of the present invention, in which the number of wheel divisions is set to an arbitrary n number, and the same effects as in the above embodiment can be obtained in this applied example as well.

〔発明の効果〕〔Effect of the invention〕

本発明によれば、車輪を細分割化し、車輪部を多くする
ことＫより車輪総幅を大きくできる。According to the present invention, the total width of the wheel can be made larger than by dividing the wheel into smaller parts and increasing the number of wheel parts.

また、これにより旋回時の各車輪の内外輪差を小さくで
きるので、取付高さが低く、耐荷重も大きいという仕様
を満足した状態で、旋回時の抵抗が小さい（始動荷重が
小さい）、また車輪のすべりが少なく耐久性も良いとい
う効果がある。In addition, this makes it possible to reduce the difference between the inner and outer wheels of each wheel when turning, so while satisfying the specifications of low mounting height and high load capacity, the resistance during turning is small (small starting load), and This has the effect of reducing wheel slippage and improving durability.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は従来の双輪キャスタの斜視図、第２図は従来の
双輪キャスタの平面視図、第３図は本発明の一実施例に
ょる双輪キャスタ斜視図、第４図は第２図の平面視図、
第５図は応用実施例のキャスタ正面視図を示す。FIG. 1 is a perspective view of a conventional dual-wheel caster, FIG. 2 is a plan view of a conventional dual-wheel caster, FIG. 3 is a perspective view of a dual-wheel caster according to an embodiment of the present invention, and FIG. 4 is a perspective view of a conventional dual-wheel caster. Plan view,
FIG. 5 shows a front view of the caster of the applied example.

Claims (1)

【特許請求の範囲】[Claims] 車軸と車軸に通された車輪からなる車輪部と回転自在な
機構を有する取付座からなる双輪型キャスタにおいて、
前記車輪部の車輪部を２以上の任意の複数個に細分割化
し、かつ前記分割された車輪が各独立に回転することを
特徴とした双輪型キャスタ。A twin-wheeled caster consists of an axle, a wheel part consisting of a wheel passed through the axle, and a mounting seat with a rotatable mechanism.
A twin-wheel type caster characterized in that the wheel portion of the wheel portion is subdivided into two or more arbitrary plurality, and each of the divided wheels rotates independently.