Sansome Bend

The Sansome Bend is used to join two ropes together, particularly when working with slippery, non-compliant cordage such as bungee cord or modern synthetic materials. It addresses the common complaint about the Sheet Bend's tendency to work loose by incorporating an extra locking turn at the start of the knot. This bend is well suited for applications where the standard Sheet Bend proves unreliable—elastic cords, stiff materials, or situations where the knot may be subject to intermittent loading or vibration.

According to Nic Compton's The Knot Bible, the Sansome Bend apparently originated in the weaving trade during the 19th century. The textile mills of that era employed various knots for joining threads and yarns, with the Sheet Bend (also known as the Weaver's Knot) being the most prominent. It is plausible that weavers developed variations like the Sansome Bend to address specific challenges with certain materials. However, independent documentation of the knot's weaving trade origins has proven difficult to locate, and the Sansome Bend remains relatively obscure compared to other bends. The name 'Sansome' most likely refers to a person or family associated with either its invention or popularization, echoing a pattern seen with other knots, but the exact historical person, place, or event remains unidentified.

The Sansome Bend is described as a development of the Sheet Bend, distinguished by an extra locking turn cleverly inserted at the start of the knot. This additional turn provides extra friction and grip that counters the tendency of the Sheet Bend to work loose, particularly in slippery or stiff materials. Like the Sheet Bend, the knot begins with forming a bight in one rope, with the second rope passing through and wrapping around the bight. The specific placement and method of the additional locking turn creates a more secure grip than the standard Sheet Bend. As with the Sheet Bend, the two working (short) ends should emerge on the same side of the knot.

The Sansome Bend's primary advantage over the standard Sheet Bend is its enhanced security with difficult materials. The extra locking turn provides additional friction that helps prevent the knot from working loose under cyclic loading or when tied in materials that don't hold knots well. It is recommended for joining bungee cords, shock cord, and other elastic or slippery synthetic cordage where traditional bends may prove unreliable. As with any bend, it should be properly inspected, dressed and set before use.