초록 ▼

A centralizer apparatus for centralizing tubular casing in a borehole having two stop collars for securing to the casing in a spaced apart relationship and two moving collars, one slidably and rotatably coupled to each stop collar, a plurality of bow springs, each bow spring having a first end space

A centralizer apparatus for centralizing tubular casing in a borehole having two stop collars for securing to the casing in a spaced apart relationship and two moving collars, one slidably and rotatably coupled to each stop collar, a plurality of bow springs, each bow spring having a first end spaced apart from a second end, each bow spring biased outwardly from the center axis, the first ends connected to the first moving collar, the second ends connected to the second moving collar.

대표청구항 ▼

A centralizer apparatus for centralizing tubular casing in a borehole having two stop collars for securing to the casing in a spaced apart relationship and two moving collars, one slidably and rotatably coupled to each stop collar, a plurality of bow springs, each bow spring having a first end space

A centralizer apparatus for centralizing tubular casing in a borehole having two stop collars for securing to the casing in a spaced apart relationship and two moving collars, one slidably and rotatably coupled to each stop collar, a plurality of bow springs, each bow spring having a first end spaced apart from a second end, each bow spring biased outwardly from the center axis, the first ends connected to the first moving collar, the second ends connected to the second moving collar. sing holes of the lateral columns of the cord passing holes; and a plurality of horizontally arranged linking ropes, the ends of which are secured to respective lateral edges of the fabric drapery, and the linking ropes are further secured to the central pull cord via linking joints disposed above corresponding ones of the cord passing holes, such that when the central pull cord is pulled, the linkage ropes are pulled by the central pull cord and the lateral edges of the fabric drapery to which the linking ropes are attached, are pushed towards the central pull cord, thereby forming wave-shape patterns on lateral edges of the fabric drapery.