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A swivel caster with a wheel lock. The vertical swivel on this type of caster cannot be locked in position. Caster central locking mechanism on an old Stryker hydraulic stretcher. Shown in the locked position with the center cam rotated downward. Common inexpensive casters may include a brake feature, which prevents the wheel from turning. This ...
Consequently, it may be difficult or impossible to move a wagon that has a large number of swivel casters when the casters are unaligned. As a result, rigid casters are preferred for larger wagons, which typically require a proportionally higher number of casters. [2] Air casters are sometimes used in place of rolling casters. These require ...
There is usually a locking lever that can be used to stop the chair from swinging. The lock should be used occasionally to challenge and promote the body's postural muscles by not leaning when the chair is locked. Standards for the design and testing of office chairs include: EN 1335:2012; EN 1728:2012; ANSI/BIFMA X 5.1; DIN EN 1335; DIN 4551 ...
Trunnion. The trunnions are the protrusions from the side of the barrel that rest on the carriage. A trunnion (from Old French trognon 'trunk') [1] is a cylindrical protrusion used as a mounting or pivoting point. First associated with cannons, they are an important military development.
A swivel chair with a pump to raise and lower the seat. A swivel, swivelling, spinny, or revolving chair is a chair with a single central leg that allows the seat to rotate 360 degrees to the left or right. A concept of a rotating chair with swivel castors was illustrated by the Nuremberg noble Martin Löffelholz von Kolberg in his 1505 ...
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