Most historians attribute its lack of popularity in the United States to Henry Ford. Having been nearly bankrupted by shady European licensees, Robertson refused to license his invention to Ford. Without a guaranteed supply, Ford turned to the Phillips-head screw, cementing its reign in American industry.
What is a Robertson screwdriver used for?
Combination Robertson/Phillips drives are often used in the electrical trade, particularly for device and circuit breaker terminals, as well as clamp connectors. Robertson screwdrivers are easy to use one-handed, because the tapered socket tends to retain the screw, even if it is shaken.
What is the difference between a Robertson and a Phillips screwdriver?
Robertson’s design consists of a tapered square-tipped screwdriver that fits into a matching square recess (the “socket”) in the screw head. This design makes a Robertson screwdriver less susceptible to cam-out than a Phillips driver because the driver bit inserts deeper into the screw head.
Why is it called a Robertson screwdriver?
Peter frequently told the story- now a legend – about the accident in downtown Montréal. He was demonstrating a spring-loaded screwdriver when the blade slipped from the screw-slot and badly cut his hand. The incident inspired him, so he decided to invent an improved and safer screw – The Robertson® Drive.
Can you buy Robertson screws in the US?
American furniture, appliance and mobile-home industries use them, but the classic Canadian fastener is still virtually unknown to do-it-yourself home renovators. Home Depot reports Robertson screwdrivers account for less than 5 per cent of sales in the United States.
Why do we still use flat head screws?
Originally posted by FXWizard: Why? Because some manufacturers have not yet experienced the perfection that is the Robertson head screw Flat head screws are good for wood as they prevent overtightening and thus help prevent stripping.
Why are Robertson screws better?
The square-head screw was invented by P. I. Robertson, a Canadian, in 1908. It offered a big advantage over the slotted screw head because it was self-centering and not prone to slipping when driven.
What is the most common Robertson screwdriver size?
The medium-size that’s most common is red; anyone who calls this a “#2 Robertson” deserves arched eyebrows and a thorough looking-down-on. Black is the largest size, with green being smaller; yellow and orange are smaller still but much less common.
What is the common name for the Robertson tip screwdriver?
A Robertson screw, also known as a square or Scrulox screw drive, is specified as ANSI Type III Square Center and has a square-shaped socket in the screw head and a square protrusion on the tool.
Which of the following Robertson screwdriver tips is the largest?
Black Robertson drivers work with the largest screws, types 12 and higher, and have a recess range of 4.81 to 4.85 mm.
Which is better flathead or Phillips?
Only the strongest flathead driving bits are used for high-torque manufacturing processes. By comparison, a Phillips screwdriver is very well-suited for industrial processes. Once the Phillips bit is seated securely in the Phillips head screw, the operator can apply much more torque for fastening.
What are the disadvantages of a Phillips screwdriver?
One of these drawbacks was the tendency of slotted drivers to over-torque a screw. The Phillips screwdriver was designed to purposely pull-away or “cam-out” when the torque becomes too great. This prevents the screw head from snapping off and also allows the operator to know when the screw is fully seated.
Why are Robertson screws popular in Canada?
Phillips had invented another kind of socket screw and had no such reservations. Although the Robertson screw is most popular in Canada, it is used extensively in boat building because it tends not to slip and damage material, it can be used with one hand, and it is much easier to remove/replace after weathering.
Are Robertson screws Canadian?
Robertson | Robertson Inc | Woodworking | Millwork | Fasteners | Screws. In 1908, P. L. Robertson began to manufacture a square recess impression in the head of a screw in Milton, Ontario, Canada.
Are Robertson screws only in Canada?
The Robertson is now widely used only in Canada even though an independent study by the magazine Consumer Reports declared it far superior to the Phillips, which is notorious for slippage and stripped sockets.
When did they start using Robertson screws in furniture?
Robertson Screw
In 1908, square-drive screws were invented by Canadian P. L. Robertson (1879–1951), 28 years before Henry Phillips patented his Phillips head screws, which are also square-drive screws.
Why do tri wing screws exist?
The Tri-Wing is a type of screw and screw head. It is sometimes called a triangular slotted screw. It is used as a tamper-resistant screw on various products, typically electronics.
Which screw head is best?
The star head (sometimes known as the branded name Torx) is the best commonly-used screw head on the market. It allows for a huge amount of torque without stripping and it’s difficult for the bit to slip out.
