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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.
The first known example of a tumbler lock was found in the ruins of the Palace of Khorsabad built by king Sargon II (721–705 BC.) in Iraq. [1] Basic principles of the pin tumbler lock may date as far back as 2000 BC in Egypt; the lock consisted of a wooden post affixed to the door and a horizontal bolt that slid into the post.
When closed, the top of the caisson often provides a convenient bridge across the dock. Unlike the chevron gate, this bridge is straight and so may be used for vehicle traffic. [iii] Busy gates, such as for a canal lock, may have dock sides high enough that the caisson can run beneath them. In this case, the roadway on top of the caisson, or ...
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.
The underside of a disc tumbler lock A key for a disc tumbler lock. A disc tumbler or disc detainer lock is a lock composed of slotted rotating detainer discs. The lock was invented by Finnish founder of Abloy, Emil Henriksson (1886–1959) in 1907 and first manufactured under the Abloy brand in 1918.
Adolph Schoepe and friend [2] Karl Rhinehart founded Gateway Manufacturing Company in South Gate just before the end of World War II. They manufactured locks under the Kwikset brand. They moved the company to Anaheim in 1948. [2] During the Korean War, demand plummeted, but the company took a risk, producing more goods than they could sell.