Rolex Industries Sakinaka, Mumbai, Maharashtra

A thruster shoe brake has a pair of cast iron shoes which are lined up with friction pads. The shoes are hinged on main arm and side arm of the brake, each of them have a hinge pin fitted in the base. They are connected to each other on top by a tie rod, which is hinged in the main arm and locked to the swivel block in the side arm, by a lock nut. A crank lever is hinged on the main arm and the other end is fixed to the top clevis of the thruster by a hinge pin. A brake spring is fixed on the main arm and is pre-loaded by a locknut on the lever. The pre-tension in this spring decides the braking torque. The thruster is fitted on the base by a hinge pin. When the thruster is not energized, the brake shoes are pressed on the brake drum fitted on the drive motor shaft and hold it under the effect of braking force provided by the spring. In such condition, the brake is applied and the drum cannot rotate. As the piston travels upwards the angle lever turns, pushes the brake rod and compresses the brake spring. Simultaneously, the brake lever on the other side of the wheel (Brake Drum) is retracted. When the first lever reaches the stop on the brake base member the brake lever at the thruster begins to move, releasing the brake drum. Technical Specification

Thruster Brake is a device used to retard the speed of moving machinery and to stop it accurately to the desired position. The braking force is applied to the brake shoes by a pre-stressed comprising spring. The shoes press on the rotating brake drum retarding its speed and finally stop it. The releasing of the brake drum and compressing of the spring is done by thruster.

ROLEX make Resistance Boxes are designed to meet requirements of AC & DC application for EOT Cranes, Winches, Rubber Mills, Flour Mills, Coal Mines, Cement Mills, Power Plants, Conveyors, Coke Oven, Blowers etc. for Speed control and developing Starting Torque.

Rotary Geared Limit Switch is used to trip motor supply when the Moving loads reach the extreme end positions of working zone. Rotary Geared Limit Switches are suitable for use on reversing drives Such as Hoists, winches, rolling mills and various other mechanisms used in steel plants such as coke oven, feeding machinery etc.

Master Controllers are used for operation of contractor’s equipment controlling E.O.T. Cranes & Rolling mills drives. The controllers are made in dust proof enclosure in IP-54 degree of protection, up to 6 notches either side with maximum 24 contacts as per desired sequence with spring return arrangement & deadman's handle arrangement are available. Master Controllers are compact up to 4-0-4 step suitable for Hoist, Grab, CT-LT maximum contacts 16 per motion with spring return arrangement.

Clutch is used to transmit the power only & Brake is used to stop machine only. When starting & stopping both are to be controlled, Clutch and Brake both are to be controlled; Clutch and Brake both are required. Clutch will engage drive to machine and when brake is applied clutch will only disconnect drive from machine and brake will stop machine only. The drive will keep rotating. This is ideal for inching operation. These are in two parts: 1) Magnet Body & 2) Armature Plate. These Clutches / Brakes engage when current is supplied to them. Slip rings are fitted to clutch only. The liner wear can be adjusted and wearing parts are replaceable. A sproket, gear or pulley can be mounted if desired.

Lever Limit Switches are used for Heavy duty E.O.T. Cranes, Hoists to prevent over Travel of hoisting motion on power and control circuit up to 500 V and 40 Amps. continuous current. The limit switch normally remains closed and cuts off power to stop the motor of the crane. The Lever limit switch operates when it reaches a Predetermined position when the lever is moved over a projecting member fixed on the girder.

A Grab Differential limit Switch is Driven by holding and closing winches used in Auxiliary circuit for single lever grabs control. It is used to stop or start the function of the motor at required preset position, irrespective of the height of the grab. It works at the highest & lowest grab position. A key is provided with the switch to release the locking nut to Adjust the cam disc.

Geared couplings are used to connect two different shafts or offset shafts. Geared couplings are made of EN material to absorb shocks. Geared coupling consists of gear which transmit the motion smoothly by absorbing shocks.

Rotary geared limit switch is used to trip motor supply when the Moving loads reach the extreme end positions of working zone.

For infallible operation of machinery, modern methods are necessary, any machines which requires its motion to be controlled, whether it is lifting Crane, Hoist, Wintch or Mining Haulage today employs an Electro Magnetic Brake, enabling the operator not only to control the motion but also to hold the load at any desired point without danger of falling, merely by release of the starting handle. Electro Magnetic Brake is adequate equipment for safer operations of machinery. Electro Magnetic Brakes are used when a load must be stopped rapidly to prevent it from roatating.These brakes are used in Paper Mills, Drives of certain Textile Machines, Sugar Mill Machinery, Rubber Mixing Mills. Assembly and Function : The shoes are of cast iron and other components are of fabricated steel. The lever is hinged on main arm, which is connected to the side arm through a tie rod, and is stress by pre-loaded compression spring. The compression of spring can be adjust to set the braking torque to desired value. The brake liner of selected quality material is reveted to the shoes by aluminium rivets. A.C. solenoid with laminated magnetic sheet steel houses a copper magnetizing coil which is impregnated with class F materials. The plunger which is connected to the lever, is drawn into the coil, when it is energised with A.C. source. This loads the spring and releases the brakes shoes from brake drum. When the supply is cut off, the plunger is pull out of the coil, and spring force clamp the brake shoes on the brake drum and the brake is applied.   A.C. Drum Brakes are suitable for single phase A.C. supply up to 440V and are available for drum  diameters of 100 mm to 380 mm and braking torques up to 69 kg-m.  Features : - Compact design - Fail Safe - Reliable in operation - Clean work environment - Braking Torque can be easily adjusted - Requires less maintenance

Very compact and modern in design. Foundation is not necessary as they are directly mounted on non-driving end shaft of the motor. It consist of Liner Plates (Brake Disc) with square hole ate the centre. One corresponding piece of square hub is supplied with the Brake. This hub is keyed to the motor shaft and the Liner Plate is free on this hub. Normally Liner Plate is gripped between two discs with the help of Spring Pressure. They work on 230 / 415 V.A.C. When the current is supplied to the brake one disc is attracted by electromagnet against spring pressure and Liner Plate is released. Thus the Brake is 'off'. Once the Brake is set it does not require adjustment or maintenance. When the liner plate wears with the use then only air gap is required to be maintained periodically. An arrangement to release the brake manually could be provided on request.

Thruster Brake is a device used to retard the speed of moving machinery and to stop it accurately to the desired position. The braking force is applied to the brake shoes by a pre-stressed comprising spring. The shoes press on the rotating brake drum retarding its speed and finally stop it. The releasing of the brake drum and compressing of the spring is done by thruster.

Counter Weight Limit Switches are used for Heavy duty E.O.T. Cranes, Hoists to prevent over travel of hoisting motion on power and control circuit up to 500v.a.c. and 40 Amps. Continuous current.

Brakes are applied on brake drum. The shoes of the brakes are applied on brake drum in normal condition. When the motion is to be obtained the brake shoe are released and the brake drum is free to rotate