The story begins in 1857, when one Halbert Greenleaf, a financier, met and established a business partnership with, Linus Yale Jnr. Not much after its initiation, a young but brilliant fledgling inventor, James Sargent, joined the firm. He had an enquiring mind and a natural understanding of mechanical practice – a natural locksmith! James was set to work as a sales rep for Yale & Greenleaf.
Halbert Greenleaf
Sargent’s Magnetic Bank Lock
Sargent’s inquisitive nature led him to search for vulnerabilities in existing lock mechanisms, both those manufactured by Yale and by their competitors. He discovered that through the application of a newly developed hand-held micrometer, he was able to crack combination safe locks from the outside, leaving no evidence that the lock had been defeated. He was the first person to employ this method.
Realising that his discovery instantly compromised every high-security safe or bank combination lock in America, and recognising the huge potential for a lock that could not be cracked, Sargent began work on a new design that would offer a hitherto unknown level of protection. The result – the world’s first key-changeable combination lock – Sargent’s Magnetic Bank Lock. The lock gained almost instant acclaim from the nation’s safe manufacturers and was snapped up by the United States Treasury. James Sargent’s place in the annals of lockmaking history was cemented.
Sargent & Greenleaf Factory. Rochester, New York
In April 1861, civil war broke out and Halbert Greenleaf left his business to serve as a Colonel in the Union Army. Yale & Greenleaf was no more. During Greenleaf’s military service, James Sargent continued to ply his trade as a master locksmith and inventor, developing his already impressive skills under the tutelage of Yale.
The American Civil War came to an end in 1865, and Greenleaf returned home. Still passionate about physical security and still impressed with the previous innovation and inventiveness of his former employee, Halbert Greenleaf sought out James Sargent. The two struck a deal and Sargent & Greenleaf was born.
Ever the financier, Greenleaf recognised Sargent’s mechanical engineering brilliance. A manufacturing facility was built in Rochester, New York, where Sargent would be given the freedom to practice his art. The Rochester factory remained the centre of operations for the S&G brand for the next 110 years.
Sargent & Greenleaf Time Lock
Under their own direction, Sargent & Greenleaf quickly capitalised on the success of Sargent’s Magnetic Bank Lock. Making refinements to the previous invention, a newly patented Automatic Lock was released. But time locks were to be Sargent’s greatest contribution to the world of physical threat mitigation.
A time lock will not open, regardless of whether a key is presented or a combination entered, until the allotted time. Time locks did exist before Sargent & Greenleaf, the first patented in England in 1831. They were not popular though, as bankers were reluctant to lock themselves out of secure areas.
As is often the way in the arena of security advancement, criminal activity was to be the catalyst for change. The late 1860s saw a trend for would be thieves to kidnap bank employees, threatening to harm them unless a key or combination was handed over. The banking world quickly changed its mind about time locks, and the race was on to perfect the mechanism.
In 1873, S&G created their first time-lock for a bank vault door. Sargent fitted the lock personally, to the vault door of First National Bank of Morrison, Illinois, where it remained until the bank was remodelled nearly 40 years later. By 1877, they had perfected the design. Sales reached the thousands, and Sargent & Greenleaf would eternally be synonymous with leading edge bank vault and safe security.
For the next 100 years, S&G continued to dominate the United States high security vault and safe lock market, although they did also branch into other markets. This was mostly in reaction to political and economic pressures, such as the Great Depression and two world wars. Interestingly, from 1940 to 1945, the entirety of S&G’s operations were devoted to ordinance work for the U.S. government, producing weapons guidance systems, depth charges, projectiles and special combination locks for weapon storage and arming.
Fast forward to 1994. The world is a very different place than it was when our protagonists were helping bank managers to deter the likes of Jesse James, but the risks to physical security remain much the same. Taking advantage of emerging technologies, S&G designed and manufactured their first ever Electronic Safe Lock, the 6120.
The S&G 6120
Sargent & Greenleaf have since expanded their range, continuing to push the boundaries of innovation in the safe locking industry. Each new emerging technology allows further development in a way that just was not possible in the day of Messrs Sargent & Greenleaf. Electronic locking in an increasingly connected world, has seen S&G focus on Audit Locks, Digital Time Locks and remotely managed Safe Locks, such as their Nexus IP Series.
For over 160 years, S&G have demonstrated ground-breaking innovation, resilience, trust and longevity. They have consistently delivered proven security solutions, protecting people and assets all over the world. Their expertise is depended upon by governments, banks, businesses and individuals around the globe. We had no hesitation in getting behind Sargent & Greenleaf and are incredibly proud to be a part of the brand’s expansive story.
A rich and immersive heritage has secured their position on the physical security world stage and the values and ingenuity of James Sargent and Halbert Greenleaf continue to inform the company’s growth. Their dedication to overcoming emerging security threats remains to this day and continues to drive advancements. S&G now serve an increasingly wide range of sectors, and are committed to meeting and anticipating their customer’s growing needs. Here’s to the next 160 years!
