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The internal-drive square socket for screws (as well as the corresponding triangular socket drive) had been conceived several decades before the invention of the Robertson screw and driver. An earlier patent covering both square-socket- and triangle-socket -drive wood screws, U.S. patent 161,390 , was issued to Allan Cummings of New York City ...
Before commercial wall plugs, fixings were made to brick or masonry walls by first chiselling a groove into a soft mortar joint, hammering in a crude wooden plug and then attaching to the wooden plug. This was time consuming and required a large hole, thus more patching of the wall afterwards. It also limited the holes' location to the mortar ...
A gimlet is a hand tool for drilling small holes, mainly in wood, without splitting. It was defined in Joseph Gwilt's Architecture (1859) as "a piece of steel of a semi-cylindrical form, hollow on one side, having a cross handle at one end and a worm or screw at the other". [1] A gimlet is always a small tool.
A butt joint with pocket hole screws. This is a variation of the screwed butt joint in which the screws are inserted into pocket holes drilled in the rear face of one of the joint members. The screws extend into cross grain in the adjacent member, so much shorter screws can be used. This method is preferred when the edges of the frame will be ...
mirror screw: This is a flat-head wood screw with a tapped hole in the head, which receives a screw-in chrome-plated cover. It is usually used to mount a mirror. sheet metal screw: Has sharp threads that cut into a material such as sheet metal, plastic or wood. They are sometimes notched at the tip to aid in chip removal during thread cutting.
Pilot holes may be used when driving a screw, typically in wood, concrete, or plastic where the screw cuts its own threads. When a screw is driven into a material without a pilot hole, it can act as a wedge, generating outward pressure which can cause many materials to split. By drilling a small pilot hole into the material, into which a screw ...