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double lock
Founded in 1998, China Tianwai Safety Equipment Co., Ltd. is a comprehensive double lock manufacturer and wholesaler of safty equipment and safety industry. With the integrity of research, development, quality production, CAD technical system and high propagation sale, our products are widely used in the fire fighting, road safety, lighting, public secuity, family, automobile safety, petroleum, metallurgy and construction and other fields. The products passed certification of ISO9000 quality system and CCC certification. Each custom double locks product has passed the strict quality test to guarantee credible product functions before being put into markets, and the return rate of our products is below 1%.
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double lock
Exclusive SilvaBond antimicrobial protected finish
Security sets provide deadbolt and keyed entry knob that work with the same key
Dependable security, meets ANSI grade 3 standards
Polished Brass Finish
The SilvaBond antimicrobial protected finish has proved to be very effective in controlling bacteria, mold and mildew on surfaces. Independent laboratory testing has confirmed the effectiveness of this long lasting and durable finish.
Part two of the story takes place a few years later when Orson C. Phelps invents and patents (on July 17, 1866) his version of a rachet handcuff. The Phelps design brought the notches for the ratchet to the inside of the square bow and featured a heavier and more secure lock case. Phelps handcuffs are very well made and although the lock is not very secure it is a vast improvement over any earlier handcuff design. The example shown above is marked "O. C. Phelps Patented July 17 66" on the side of each bow. It is unknown if Phelps paid a royalty to Adams, who held the original ratchet handcuff patent.
double locks
Removable Thumb-Turn Piece
Conversion from Single Sided to Double Sided
ANSI Grade 1 Locking Mechanism
UL Fire Rated Latch
Adjustable Backset (2 3/8", 2 3/4")
The story begins with W. V. Adams who introduced the adjustable ratchet principle to handcuffs in his patent of June 17, 1862. Prior to Adams all handcuffs, at least those in America, were of fixed size. The most common design of the time was the classic Darby, popularized in England by Hiatt, but also made in America most commonly by the Providence Tool Company. At this point John J. Tower enters the picture. After establishing his company in 1865, Tower introduced a series of handcuffs initially built under license of both the Adams and Phelps patents. The exact date of the first Tower handcuffs is unknown, but a sequence of at least three distinct models were released bearing only the Adams and Phelps patent dates.
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