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This is a trapped-key interlock on the door of an electrical switchgear cabinet. It is attached with one-way security screws to discourage casual removal, which would defeat the interlock scheme. Trapped-key interlocking utilizes locks and keys for sequential control of equipment and machinery to ensure safe operation. Trapped-key interlocks ...
The key will not turn unless the remaining keys are put back in place. Trapped key interlock transfer block. Another example is an electric kiln. To prevent access to the inside of an electric kiln, a trapped key system may be used to interlock a disconnecting switch and the kiln door. While the switch is turned on, the key is held by the ...
Allen-Bradley is the brand-name of a line of factory automation equipment owned by Rockwell Automation.The company, with revenues of approximately US $6.4 billion in 2013, manufactures programmable logic controllers (), human-machine interfaces, sensors, safety components and systems, software, drives and drive systems, contactors, motor control centers, and systems of such products.
Rockwell acquired the privately held Allen-Bradley Company for US$1.6 billion in February 1985 – US$1 billion of which was cash – and became a producer of industrial automation hardware and software. During the 1980s, Anderson, his CFO Bob dePalma, and the Rockwell management team built the company to #27 on the Fortune 500 list. It boasted ...
In 1985, Rockwell International purchased Allen-Bradley for $1.651 billion; this was the largest acquisition in Wisconsin's history to date. [3] For all intents and purposes, Allen-Bradley took over Rockwell's industrial automation division. The 1990s featured continued technology development, including the company's launch of its software ...
According to the Guinness Book of World Records: "The largest four-faced clock is that on the research and office addition of the Allen-Bradley Company. Each face has a diameter of 40 feet 3 + 1 ⁄ 2 inches (12.28 meters), and is octagonal to represent the outline of the Allen-Bradley logo. Dedicated on October 31, 1962, it rises 280 ft (85 m ...
Mayor Sara Funaro’s Cabinet also approved a 10-point plan that would ban key boxes on buildings in Florence’s historic centre, a statement from City Hall said last month.
Railway interlocking is of British origin, where numerous patents were granted. In June 1856, John Saxby received the first patent for interlocking switches and signals. [2] [3]: 23–24 In 1868, Saxby (of Saxby & Farmer) [4] was awarded a patent for what is known today in North America as “preliminary latch locking”.