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Four heavy duty casters on a large subwoofer whose weight can exceed 500 pounds (230 kg) depending on driver and top loading, and must be able to withstand rough handling. Industrial casters are heavy duty casters that are designed to carry heavy loads, in some cases up to thirty thousand pounds.
In 2007, TENTE-ROLLEN GmbH founded a subsidiary in Poznań, Poland, which became a subsidiary of TENTE International GmbH in 2013. TENTE Schwerlasttechnik GmbH, specialising in the manufacture of heavy duty castors and wheels, was founded in 2008. The agent in Denmark (a TENTE agent since 1961) became a subsidiary in the same year.
Wheel alignment is simplified. Traction, braking and tire wear characteristics do not change as the suspension is compressed. These are great benefits in a vehicle that carries heavy loads, and together with the beam axle's characteristic strength, this has resulted in front and rear beam axles being nearly universal in buses and heavy-duty trucks.
The wheel rate is calculated by taking the square of the ratio (0.5625) times the spring rate, thus obtaining 281.25 lbs/inch (49.25 N/mm). The ratio is squared because it has two effects on the wheel rate: it applies to both the force and the distance traveled. Wheel rate on independent suspension is fairly straightforward.
Caster displacement moves the steering axis ahead of the axis of wheel rotation, as with the front wheels of a shopping cart. Caster angle moves the steering axis from vertical. [3] In automobile racing, the caster angle may be adjusted to optimize handling characteristics for a particular venue. This is all connected to the front wheels.
This can be contrasted with steer, which is the antisymmetric angle, i.e. both wheels point to the left or right, in parallel (roughly). Negative toe, or toe out, is the front of the wheel pointing away from the centreline of the vehicle. Positive toe, or toe in, is the front of the wheel pointing towards the centreline of the vehicle. [2]