| 主权项 |
1. An open-ended ratchet wrench assembly for use in rotating rotatable fittings, the wrench assembly comprising:
a plurality of interchangeable wrench heads, each wrench head having: a head arcuate mating feature; and
a fitting engagement opening; anda wrench body having:
a body arcuate mating feature for mating engagement with the head arcuate mating feature of one of the wrench heads when the wrench head is in a working position, so as to permit rotational movement of the wrench head relative to the wrench body about an axis of rotation defined by the arcuate mating features, while impeding movement of the wrench head in one direction along the axis of rotation and movement of the wrench head laterally with respect to the axis of rotation; and a cover affixed to the wrench body and resiliently biased in a head retention position in which the cover overlies one of the wrench heads in the working position so as to impede movement of the wrench head in the other direction along the axis of rotation, the cover hand manipulable from the head retention position, in a plane of movement to which the axis of rotation is substantially normal, so as to permit the installation and removal of wrench heads in the working position; and a ratchet assembly permitting rotation of the wrench head in the working position relative to the wrench body in one direction about the axis of rotation and impeding rotation in the other direction. |
