Lexicon: C
Castors
Hardly any other invention has influenced the world as much as that of wheels and castors. Industrialisation, globalisation and much more – without the castor such progress would scarcely have been possible. But what exactly are castors?
A distinction is made between fixed and swivel castors. Fixed castors are rigid, i.e. do not swivel. They give directional stability to the equipment to which they are attached, but limit their manoeuvrability. Swivel castors, on the other hand, swivel around a vertical axis, which allows them be moved in all directions. A combination of both types ensures both smooth running in a straight line and good manoeuvrability. Another type of castor has a tyre with a tread and steel band. These are used, for example, in transport applications.
What components are castors made of?
Basically, a castor consists of a wheel, a housing and a fitting. The wheel itself can be subdivided into the wheel centre, the tread and a wheel bearing with axle material. wheel bearings are available in different versions, such as plain, roller or ball bearings. Depending on the tread material, the running characteristics of the wheel may differ;
The housing design varies depending on whether it is for a swivel castor or a fixed castor. To ensure that swivel castors can move in any direction, the corresponding housing must be mounted so that it can rotate around a vertical axis. For fixed castor housing this is not necessary; they are therefore rigid and allow only one direction of movement. The fitting serves to connect the castor to the trolley or equipment. There are various different fitting options, including plate, tube and plug fittings as well as expander fittings. In addition, a castor may include other components such as a wheel lock that allows the wheels to be locked quickly, easily and safely. You can lock the wheel itself or the swivel action, or both at the same time. This latter feature is referred to as a total lock.
Where are they used?
Castors are used in almost all areas. On furniture in the home or office, in production facilities and warehouses, in hospitals and care homes and last but not least, of course, cars, bicycles and many other means of transport.