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The rolling lift trunnion (sometimes a "Scherzer" rolling lift), raises the span by rolling on a track resembling a rocking-chair base. The "Scherzer" rolling lift is a refinement patented in 1893 by American engineer William Donald Scherzer. [3] The rarer Rall type combines rolling lift with longitudinal motion on trunnions when opening. [4]
Single weight chain lamp. This construction uses a chain to keep the arm with the counterweight and the forearm parallel. The lamp-cap and counterweight move in opposite directions (both away from the base or both towards it). The balance that is required is shown by the following formula: d 1 = Lamp-cap to base; m 1 = weight of lamp-cap
In traction (non-hydraulic) elevators, a heavy counterweight counterbalances the load of the elevator carriage, so the motor lifts much less of the carriage's weight (specifically, the counterweight is the weight of the carriage plus 40-50% of its rated capacity). The counterweight also increases the ascending acceleration force and decreases ...
A cantilever is a rigid structural element that extends horizontally and is unsupported at one end. Typically it extends from a flat vertical surface such as a wall, to which it must be firmly attached. Like other structural elements, a cantilever can be formed as a beam, plate, truss, or slab.
The lift lines of a counterweight rigging systems are typically a specific type of steel wire rope known as galvanized aircraft cable (GAC). Oil-free 0.25-inch (6.4 mm) diameter, 7 x 19 strand, GAC is the most common counterweight system lift line. It has a minimum cable breaking strength of approximately 7,000 pounds (3,200 kg). Line control
A cantilever bridge is a bridge built using structures that project horizontally into space, supported on only one end (called cantilevers).For small footbridges, the cantilevers may be simple beams; however, large cantilever bridges designed to handle road or rail traffic use trusses built from structural steel, or box girders built from prestressed concrete.
A rigid chain actuator, known variously as a linear chain actuator, push-pull chain actuator, electric chain actuator or column-forming chain actuator, is a specialized mechanical linear actuator used in window operating, push-pull material handling and lift applications. The actuator is a chain and pinion device that forms an articulated ...
The vertical lift and 'beyond vertical' drop on a Gerstlauer Euro-Fighter. The Euro-Fighter is a type of steel roller coaster developed by Gerstlauer.First launched in 2003, the trademark feature of the roller coaster is its beyond-vertical drop, which reaches an angle greater than 90 degrees.