Patent ID: 8491012

Claim:
A coupling for connection to an end of a tubular element for receiving a source of fluid pressure, the coupling comprising: a generally tubular body having a bore therethrough extending into the body from an open end thereof towards an internal shoulder, the bore having a counterbored portion extending from the open end of the body to an internal end wall, and the shoulder being defined in the counterbored portion between the end wall and the body open end; a slidably movable jaw ring received coaxially in the bore counterbored portion between the end wall and the shoulder, the jaw ring having a forward surface facing the shoulder and defining a movable jaw face; a generally annular bushing fitted coaxially into the body open end, the bushing having a rearward surface facing the movable jaw face and defining a stationary jaw face positioned between the shoulder and the body open end; a resiliently expandable grab ring received coaxially in the bore counterbored portion, the grab ring having an outer diameter portion disposed between the shoulder and the stationary jaw face, and an inner diameter portion divided into a plurality of teeth, each of the teeth having a height extending from the outer diameter portion to the inner diameter portion, and the tubular element end being receivable coaxially into the bore through the teeth of the grab ring; and a seal ring received coaxially in the bore counterbored portion between the end wall and the jaw ring, wherein with the tubular element end being inserted coaxially from the body open end into the bore and through the bushing and the teeth of the grab ring, and with the tubular element being grabbed by the teeth of the grab ring to retain the tubular element end in the bore, the seal ring is responsive to fluid pressure received within the tubular element to slidably move forwardly towards the stationary jaw face, such movement urging the jaw ring towards the stationary jaw face such that a portion of the height of the grab ring teeth between the grab ring outer diameter portion and inner diameter portion is clamped between the movable jaw face and the stationary jaw face restricting the removal of the tubular element end out of the bore.