A lip wider than the hole prevents it from falling behind the wall, and often features such as cleats/spikes prevent it from rotating when being compressed. The fastener is an anchor, an expandable sleeve that slides into a hole drilled into the wall. Although his patent acknowledges that expandable fasteners of this general kind were already known, Croessant's patent is intended to provide "an improved and adequate anchoring grip that may be retightened if necessary and that will permit repeated withdrawals and reengagements of the associated bolt." The same year, Croessant also registered the trademark "MOLLY". The molly bolt was patented in 1934 by George Frederick Croessant. History Figure 1 of the original patent for the molly bolt, U.S. The name drywall anchor sometimes is used in a way that includes both mollies and plastic deformable anchors, and sometimes it is used to distinguish the plastic type ( wall plugs) from mollies. Other names used for this same general type of fastener include hollow-wall anchor and hollow-door anchor, sometimes with design variations but always with the same design theme of expansion via deformation as the screw is tightened. The name Molly was formerly trademarked but is now often used in generic reference. For heavy objects, multiple molly bolts may be required. Larger sizes permit reasonably heavy objects, such as shelving, flatscreen-TV mounts or central-heating radiators, to be attached to drywall in locations where there is no stud behind the drywall. A fastener providing an expandable metal anchor Molly fastenerĪ molly or molly bolt (often misspelled moly ) is a type of screw fastener that fastens objects to plaster or gypsum board hollow walls by providing an anchor to be lodged inside a hole and expanded once in position.
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