SELF-RETAINING HYDRAULIC ARMATURE Russian patent published in 2017 - IPC E21B23/01 

FIELD: machine engineering.

SUBSTANCE: armature includes a hollow rod, rams, a cylinder, a collet and a piston-pusher of the cone bushing made in the form of two-sided collet with internal and external helical thrust thread which is engaged with mating screw thrust thread on the outer surface of the armature hollow rod and the inner surface of the cone bushing which is movably joined by its upper end with inner groove of dovetail type in the cone bushing, which outer inclined surface is made with a groove of the dovetail type engaged with similar reciprocal groove on inner surface of the ram which is movably joined with the groove of dovetail type in a supporting coupling. The lower end of the collet rests on the annular piston moving in annular cavity of the cylinder bushing formed between the hollow rod and the lower extension of the cone bushing. The annular cavity is sealed with seals and hydraulically communicated with the inner cavity of the armature through a radial hole in the hollow rod.

EFFECT: enhanced reliability of the armature.

2 dwg