| 摘要 |
Various forms of tools are disclosed for effecting reciprocal movements between jaw members to be located between and exerting opposing thrusts on the flange and bolt head of a hollow wall anchor. For such an anchor driven through a plaster wall or wallboard with the flange brought flush against the inner surface thereof, the threaded bolt is unthreaded sufficiently to position the jaws as described. Operation of the tool to thrust the jaws apart causes the bolt to be drawn out axially, carrying the inner end of the anchor so as to decrease the distance between flange and inner end and deforming the anchor body for interlocking it with the wall material. Where such an anchor is initially only partly driven through the wall, due to its inner end being obstructed, the bolt is unthreaded and the jaws located between the thus spaced head and flange in the same manner. However, thrusting the jaws apart in this instance results in the flange being driven into seating engagement with the inner wall surface, with accompanying deformation of the anchor body to interlock with the wall material. The tool in one embodiment employs an adjustable fulcrum for a lever via which to move a bar carrying one of the jaws relative to the other jaw carried on a base. In other embodiments, reciprocal jaw action is effected via a rack and pinion drive, and a linear actuator.
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