Marland Clutch products

These extremely reliable roller style, bearing supported backstops provide positive protection against potentially dangerous and damaging reverse torque runaways of inclined conveyors. Units are designed to be installed on the low-speed side of the conveyor’s head shaft drive -- where reverse torque loads originate. Self-contained, oil-lubricated BC models are built to operate in dusty, high temperature mine and quarry environments. All units feature a grease labyrinth seal that prevents dust from attacking internal oil lip seals that could wear and leak if infiltrated.

Automatic freewheel clutch mounted on hydrodynamic brake. Allows brake to work only when lowering loads from drawworks cable reel. Uniform Load Distribution is assured by full-phase true cylindrical rollers enclosed in a cage to act in unison on flat cam surfaces. The cage forces all the rollers to engage simultaneously, accurately maintaining their relative positions, thereby assuring that each roller will carry an equal share of the load.

Marland Clutch brings to the North American market a line of proven sprag type free-wheel clutches. Marland utilizes the knowledge of its sister divisions, Stieber of Germany and Formsprag of the United States, to manufacture world class high performance sprag clutches in the United States. The RMS, RMT and RMI model freewheels include ball bearings and seals. These self-contained freewheels have a bolt circle on their outer race to which pulleys, gears and torque arms can be mounted. The freewheels are mounted onto shafts which may be of any diameter up to and including the maximum bore shown below. Keyways are provided.

Model RSCI is a centrifugal throwout sprag type overrunning backstop with the inner race rotating. Only the inner race is designed for overrunning. The RSCI is not a self-supported design, therefore bearings must be provided to ensure concentricity of the inner and outer race and to support axial and radial loads. This model makes an excellent long-life backstop as there is no contact of the load surfaces during normal running of the equipment.