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Other varieties of wall plug are mechanical anchors for heavy duty loads and hollow wall fixings for fixing to plasterboard. The first mechanical anchor, the Rawlbolt, was designed in the 1930s by the Rawlplug company and the first fixing for hollow walls was the Toggle Bolt, which was also designed by Rawlplug in 1941.
Figure 1 of the original patent for the molly bolt, U.S. Patent No. 2,018,251. The molly bolt was patented in 1934 by George Frederick Croessant. [3] 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 ...
Expandable wall anchors with toggle arms. A drywall anchor, also known as a wall anchor, is an insert that, combined with the appropriate screw, can create a strong mount anywhere on a drywall panel or similar hollow wall. [1] A drywall anchor goes between the screw and the drywall, gripping the drywall much more effectively than a screw would. [2]
Bonded anchors are also referred as adhesive anchors [9] or chemical anchors. The anchoring material is an adhesive (also called mortar) [3] usually consisting of epoxy, polyester, or vinylester resins. [1] In bonded anchors, the force-transfer mechanism is based on bond stresses provided by binding organic materials.
Various sized cuts of 1 ⁄ 2 in (13 mm) drywall with tools for maintenance and installation . Drywall (also called plasterboard, dry lining, [1] wallboard, sheet rock, gib board, gypsum board, buster board, turtles board, slap board, custard board, gypsum panel and gyprock) is a panel made of calcium sulfate dihydrate (), with or without additives, typically extruded between thick sheets of ...
A rail fastening system is a means of fixing rails to railroad ties (North America) or sleepers (British Isles, Australasia, and Africa). The terms rail anchors, tie plates, chairs and track fasteners are used to refer to parts or all of a rail fastening system.
A simple timber frame made of straight vertical and horizontal pieces with a common rafter roof without purlins.The term box frame is not well defined and has been used for any kind of framing (with the usual exception of cruck framing).
In 1894, Richter applied his "Anchor" trademark to the Richter's Anchor Stone Building Sets (Richters Anker-Steinbaukasten). More than 600 different sets were produced over the multi-decade life of these sets; more than 1,000 stone shapes were made (CVA Stone Catalog). In 1910 Richter died, heralding the end of the first era for Anchor Stones.