TEI Rock Drills
Leaders in Drilling Attachments and Limited Access
TEI Awarded Patent on New Line of Drifters
The new series of drifters from TEI provides an internal dampening of the piston. This is a completely new way of thinking about how to deal with the problem of free oscillation of the hammer piston.
Rather than using an external dampening which, only absorbs the impact of the piston, and wastes energy, the TEI hammer changes the stroke of the piston. This method saves the drifter from self-exploding and huge parts orders.
The rear landing of the piston overlaps the cylinder bore to slow the shifting of the shuttle valve, which then will slow down the piston. This motion keeps the piston from reaching its power stroke when not engaged by the shank adapter or striker bar.
The internal oil passage from the forward oil compartment syncs with the trip point of the shuttle valve. This allows an internal dampening of the piston while the front of the piston is not engaged with the striker. A small amount of oil is transferred between the chambers to create internal dampening of the piston. This transfer compensates for the compression of the oil so that the high-pressure seals in the front of the piston are not destroyed by excessive pressure.
When the piston is engaged by the shank/striker it is moved backwards opening the fluid flow required to shift the shuttle valve, beginning the oscillation of the piston. In this position the piston reaches its power stroke for drilling.
The over lapping of the rear landing of the piston combined with the new internal bypass will make the drill much more user friendly. Because the piston cannot reach its power stroke without being engaged with the shank adapter the front seal life is also extended because of the limited compression of the oil while the piston is not engaged with the shank adapter.
Patent Claims; An internal hydraulic dampening system that automatically reduces the power oscillation of the piston when the shank adaptor is not in the power impact position.
So what does this mean to the drilling contractor?
- A more efficient percussion unit that does not waste energy/parts.
- Best drifter design on the market for "heavy handed" operators.
- Simple design, built for easy service and repair.
- Best method for installation of the hollow bar technology.