The Link Latch™ Underground Head Assembly features dual lip seals and a pump-in valve for faster tripping times and positive latch indication; the location of the lip seals prevents in ground fluid or gas pressure from releasing the latches and eliminates the need for drive keys or tangs to keep the head spinning with the rods.

The head assembly also features the knuckle-head spearpoint for easier unloading of the inner tube in tight spaces, and the new retracting case allows loading of the head assembly into the rods without a loading sleeve.

Boart Longyear’s overshots are an integral part of the Q™ Wireline system. Once the inner-tube is full of core, the overshot is lowered (or pumped-in for an inclined-hole) to the bottom of the hole. Its heavy-duty lifting dogs grab a secure hold at the top of the inner-tube assembly.

For maximum productivity in underground or pump-in applications, the Quick Pump-In™ Overshot provides significantly improved pump-in rates with dual pump-in lip-seals; as well as new ‘V-Lip’ pump-in seals in NQ™ and HQ™ sizes. The variable profile of the ‘V-Lip’ seal provides improved performance and accommodates both standard wall and W-Wall™ drill rods when used with the new Roller Latch™ underground head assembly.

In addition, this overshot incorporates the proven Boart Longyear™ “Landing Indicator” ball and bushing. The ball and bushing provide a pump-in valve, a bypass valve, and a landing indicator pressure signal.