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A tubular lock and key. A tubular pin tumbler lock, also known as a circle pin tumbler lock, radial lock, or the trademark Ace lock popularized by manufacturer Chicago Lock Company since 1933, is a variety of pin tumbler lock in which a number of pins are arranged in a circular pattern, and the corresponding key is tubular or cylindrical in shape.
Plomb acquired a number of companies during the 1940s, including Cragin Tool of Chicago, Illinois in 1940, P&C Tool of Oregon in 1941, Penens Tool of Cleveland, Ohio in 1942, and J.P. Danielson of Jamestown, New York in 1947. [2] Penens Tool would produce tools under the Fleet and Challenger brand names after its acquisition. [3]
Chicago Lock Co. is a lock manufacturer, founded in Chicago in 1920. Since 1933, it has sold a tubular pin tumbler lock marketed under the registered trademark "Ace." Millions of Ace locks have been sold; for instance, these locks are used in Northwestern Corporation 's Triple Play bulk vending machine.
By 1935, Milwaukee Electric Tool Corporation developed a lightweight 3/4" electric hammer drill. This power tool was designed to drill and sink anchors into concrete. This drill could also be converted into a standard 3/4" drill. Milwaukee also designed an easy-to-handle, single-horsepower sander/grinder that weighed only 15 pounds. [7]
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 ...
A plan and side view of a generic, empty canal lock. A lock chamber separated from the rest of the canal by an upper pair and a lower pair of mitre gates.The gates in each pair close against each other at an 18° angle to approximate an arch against the water pressure on the "upstream" side of the gates when the water level on the "downstream" side is lower.