A disability walker is a piece of equipment for elderly or disabled people who need help walking or to maintain balance. Other words used for a walker is walking frame or Zimmer frame. Disability walkers can be either with or without wheels. A walking frame with wheels is often called a rollator. The rollators are often more expensive and sophisticated than the standard walking frame. Some walking frames have wheels on two of their legs and two legs without wheels on them.
The most common walker we have to day was patented by Andrejs Muiza in the 1940s. The design he patented was an iron fram about waist high, about 25 cm deep and 5-10 cm wider than the user. Walkers come in standard sizes, which usually are adjustable in height to a certain degree. However, people who are either extremely tall or extremely short need special walking frame models. There are also special walking frames for children and overweight persons.
The wheeled walkers are designed of light weight sturdy materials these days. They are very popular to use among elderly people for going shopping with, as they often comes with a basket in front. The wheeled walker, or rollator, comes with breaks, and also usually a seat so that you can lean on it if you have to stop and take a break. The breaks can also be used when taking a sharp turn. Most modern day rollators have fairly large wheels, often 15 cm i diameter or more.