Abstract: The apparatus is a trapped key safety interlock device for use with a coupling that comprises a body provided with a face seal, a rim on one side and a projecting spur on the diametrically opposite side. The safety device includes a coupling part (201) which is complimentary to the said coupling (102) and which comprises a body portion having a rim portion (207) on one side for engagement with the spur of the said coupling and having a spur portion (206) on the diametrically opposite side for engagement with the rim of the said coupling (102). The rim portion accommodates a release mechanism (16, 18) for selectively enabling and disabling a key retention mechanism within the device. The key retention mechanism has a key retention condition and a key releasable condition, wherein the release mechanism comprises a primary release mechanism (16) and a secondary latching mechanism (18) resisting movement of the primary release mechanism until it is actuated itself.

Abstract: The apparatus is a trapped key safety interlock device for use with a coupling that comprises a body provided with a face seal, a rim on one side and a projecting spur on the diametrically opposite side. The safety device includes a coupling part (201) which is complimentary to the said coupling (102) and which comprises a body portion having a rim portion (207) on one side for engagement with the spur of the said coupling and having a spur portion (206) on the diametrically opposite side for engagement with the rim of the said coupling (102). The rim portion accommodates a release mechanism (16, 18) for selectively enabling and disabling a key retention mechanism within the device. The key retention mechanism has a key retention condition and a key releasable condition, wherein the release mechanism comprises a primary release mechanism (16) and a secondary latching mechanism (18) resisting movement of the primary release mechanism until it is actuated itself.