Washer-Grover is a simple solution to a complex problem

Washers are the fasteners manufacturedof various materials, mainly of metal or plastic. Their shape is often circular, but sometimes there is another (square, rectangular and even polygonal). They are designed for load distribution when screwing nuts, screws, screws, bolts, studs and other threaded connections, to prevent dents and other damage, and to ensure good electrical contact.

But there is an unusual puck. Grover has a special purpose.

Technical problem and its solution

The rapid development of machine building, which occurred insecond half of the XIX century, revealed a significant shortage of threaded connections. Mechanical loads, vibration and various vibrations of the moving parts of the machine nodes caused, in addition to fatigue failure, the risk of spontaneous reduction in the strength of their joints. Nuts and bolts loosened, and in order to control their condition, effort and time were required. At the same time, riveted joints, which were an alternative to threaded ones, made it more difficult to dismantle, and therefore also to maintain the technical equipment, which became more complicated. The special washer-Grover was the solution to this problem.

Principle of operation

All ingenious is arranged simply, and workswithout fail. Washer Grover is a single coil spring or a ring with a slot, slightly curved so that the gap diverges in a direction that prevents the rotation of the nut when it is unscrewed. During a straight run, nothing prevents the movement of the fastening assembly consisting of a bolt (screw or hairpin) and a nut. But if you try to rotate it in the opposite direction, the sharp edge digs into the metal and makes it difficult.

Where did the name "Grover" come from?

There are two main versions of why the washerSpring Grover is so called. According to the first, the name of the inventor was immortalized. In favor of this assumption is the fact that right up to the beginning of the fifties the word "Grover" in Soviet technical documentation was written with a capital letter. After the campaign against foreign words began in the USSR, in the opinion of the then linguists who only littered the "great and mighty", transistors were called triodes, resistors were resistances, and the puck-Grover was renamed to spring, or at least recommended to write this the term with a small letter.

The second variant of the origin of the term is based onhis alleged kinship with the English word "Grow", meaning "growth." If you think figuratively, then the stronger the clamping junction is clamped, the more the puck-Grover is resisting this, due to its spring nature. And when unscrewing, it straightens, and its maximum transverse dimension increases, that is, it grows.

All fasteners manufactured in ourcountry, are strictly standardized. Is not an exception and washer-Grover. GOST 6402-70 clearly regulates the mechanical properties of "spring washers", the materials from which they are manufactured, and the geometric dimensions by which they are performed. In this there is nothing surprising, from this, at first glance, a secondary assembly unit, the safety of the operation of a complex machine can depend.