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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 ...
Production grew so much that, by the 1890s, the firm was one of the largest trunk lock manufacturers in the world, employing nearly 500 workers. Products included trunk and cabinet locks, as well as high quality security-grade padlocks, and, in the early twentieth century, screw-machine products.
A common type of wafer tumbler lock, usually found on desk drawers, office cabinets, lockers and electrical panels. A wafer tumbler lock is a type of lock that uses a set of flat wafers to prevent the lock from opening unless the correct key is inserted. This type of lock is similar to the pin tumbler lock and works on a similar principle ...
Harry Soref founded the Master Lock Company in 1921 and patented an improved padlock in 1924 with a patent lock casing constructed out of laminated steel. Linus Yale Sr. invented a pin tumbler lock in 1848. Linus Yale Jr. improved upon his father's lock in 1861, using a smaller, flat key with serrated edges that is the basis of modern pin ...
In March 1844, Philip Corbin began working for the Matteson, Russell & Erwin Company (later Russell & Erwin). In the fall of 1844, Corbin worked for Henry Andrews, who had secured a contract to make locks for North & Stanley. At the Henry Andrews Company, Corbin apprenticed and learned the art of lock making.
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