Steel cables are one of the main types of flexible rigging, which is used for various lifting operations. Cables are also used for installing stationary guy wires, suspensions and other fastenings. The peculiarity of steel cable is that it is twisted from many thin threads and is very resistant to stretching in static and dynamic modes. But with high flexibility, the cable is relatively easy to break if the bending radius is less than permissible for a given diameter.
The main way to connect a cable to the hook of a lifting mechanism is through the loop at its end. But a regular loop is not suitable - under high loads it stretches and the bending radius becomes critically low. This will not lead to immediate rupture of the rigging, but some of the threads will be damaged. As a result, the strength of the rigging will decrease, and the service life will decrease by more than 50%.
Throttle for steel ropes and cables - a reliable fire
Externally, a rope thimble is a triangular, teardrop-shaped or round frame, which is made by forging or casting from high-strength carbon steel. The products are inserted inside the loop - the fire, and do not slip out thanks to the groove running along the outside. The dimensions of such a product as a thimble can be impressive - some forged marine examples weigh almost 37 kg on their own and are capable of withstanding enormous loads. Of course, smaller specimens are used in construction and everyday life - it all depends on the diameter of the rope or cable that needs to be secured at the bend of the loop.
So, with a rope diameter within 2.5 mm, you will need a thimble with a diameter of 10 mm and a groove radius of 1.5 mm. The diameter of the thimble in this case refers to the distance between the two outermost points of the circle inside the product. If the thickness of the rope is 10-12 mm, you will already need an option with a diameter of 40 mm and a groove radius of about 7 mm. That is, whatever cable or rope you choose, according to the requirements, the diameter of the inner circle of the thimble must be 4 times larger, and the groove must be of such a size that the product “sinks” almost 2/3 into it. Thanks to this, you will ensure maximum safety during work and extend the life of the cable.
There are marine, round, cable-stayed, steel and acid-resistant thimbles, as well as wedge sockets.
- Marine cable thimbles are usually made by hot forging and have a teardrop shape. There are two types of marine products - type C is used for fastening steel ropes, while type P is intended for plant ropes. Both types can be made from either carbon or low-magnetic steels. The largest representative of type C is designed for a cable with a thickness of 66.5 mm in diameter. The numbers in the marking after the letter indicate what load the fastener can withstand, for example, C400 can withstand a load of 40 tf, and P20 can withstand a load of 2 tf.
- Cable-stayed options also came to us from the marine theme, but now they are more often used in the construction industry in various kinds of braces, supports, telescoping and for connecting parts of mechanisms and metal structures. A distinctive feature of cable-stayed products is their smaller internal diameter.
- Acid-resistant elements are made of corrosion- and acid-resistant steel M1-M12. This provides additional reliability of fastenings in production. Such products are easily recognized by their shiny surface.
- Semi thimbles - used to prevent wear and tear of large diameter ropes at small bending radii, which is typical when lifting or towing loads.
- A round galvanized thimble is a solid round product, thanks to which an even circle is formed inside a loop of a cable or rope.
- Wedge options are clips for securing steel ropes in lifting mechanisms. The device consists of a clip, an insert and a wedge, which jams the rope between the walls of the clip, the insert and the wedge itself.
- The thimble for synthetic rope is characterized by the fact that its groove on the sides is closed, which prevents the soft synthetic material from slipping out.
How to make a thimble with your own hands.
Sometimes in everyday life there is a need to
make a clamp with your own hands
. Making your own clamp is not at all difficult. For this purpose, a small piece of aluminum pipe of suitable diameter into which the two ends of the cable could be inserted would be quite suitable.
The pipe must be bent in an arc at a distance of at least 120 mm. A cable is inserted into this arc, the ends of which are covered with aluminum brackets and secured with bolts and nuts. If you need to increase the cable, the diameter of the pipe is selected so that both pieces of the cable can be inserted into it.
When using homemade clamps, reliability and wear resistance will, of course, be lower than that of factory products.
Therefore, it is better not to use them under heavy loads, but for domestic needs their use is quite justified. Tweet
Methods for fixing the cable on the thimble
In mechanical engineering practice, several methods are used to fix the thimble in the end loop of a sling. This:
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- weaving the end of the cable covering the insert into the strands of the upper section;
- tightening the free end of the rope with screw clamps or clamps;
- crimping loop cables with ductile metal bushings;
- pouring unbraided strands with a metal alloy;
- wedge fastening - used in wedge thimbles included in the design of various lifting mechanisms.
When choosing a method for fixing a cable on a round thimble, you should take into account the operating load on the sling. The larger the diameter of the circle, the greater the angle between the vectors of forces acting on the cable. Therefore, the requirements for the quality of cable fixation are increased.
Types of clamps.
To ensure high reliability of the clamps, as well as to increase their service life, the clamps must be made of high-strength stainless steel. Copper and aluminum versions are acceptable for light loads. The most popular types of thimbles are:
- wedge clamp
. Mainly used for fixing rigging cables with a large diameter - up to 100 mm. The reliability of the grip in wedge clamps is ensured by a washer, which is made of soft grades of aluminum; also in this type of thimbles, bronze bushings are used to increase the wear resistance of the clamps; - single clamps of the Simplex brand.
The design of these clamps uses a stainless, durable steel plate that is inserted between the cable and a special steel plate that has beads on the edges. In addition, Simplex thimbles use a nut and bolt, which secure the cable when splicing; - barrel clamp.
It is a pair of half-cylinders that are fixed with a screw. The first one has a hole without a thread, the second one has a threaded hole. To fix the loop, two semicircular grooves are made in the semi-cylinders. The half cylinders are secured with a screw. - Duplex brand double clamp. The principle of operation of the Duplex double clamp is similar to Simplex clamps, the difference lies in the slightly longer length of the clamp elements, which makes it possible to install a second bolt with a nut;
Fixation options
It is important that the fire be reliable, otherwise the thimble will be useless. Various methods are used to form loops. For light loads, it is possible to prepare the loop using a clamp or tube.
For more reliable types, you will need to unravel the end of the cable in half. The approximate length of this part is 30 cm. We recommend using gloves to avoid damaging the skin of your hands. After unbraiding, the halves are placed in the groove of the thimble and secured to the whole part. For maximum strength, it is necessary to pass each half through the turns of the cable using a screwdriver. Additional enhancement is possible with suitable auxiliary means.
It is important to choose and install the thimble correctly. Be sure to pay attention to the load and maximum breaking force. Products with metal cores are more durable. The reliability is also affected by the type of lay, which can be single, double or triple. Before choosing, define your goals to quickly find the right option.
KOUSH is... What is KOUSH?
- KOUSH - male, marine ladle, an iron ring with edges curved outward, for tying it with rope. Splash the ladle. Dahl's Explanatory Dictionary. IN AND. Dahl. 1863 1866 ... Dahl's Explanatory Dictionary
- koush - noun, number of synonyms: 2 • kous (1) • clip (12) ASIS Dictionary of Synonyms. V.N. Trishin. 2013 ... Dictionary of synonyms
- thong - earring - [Ya.N.Luginsky, M.S.Fezi Zhilinskaya, Yu.S.Kabirov. English-Russian dictionary of electrical engineering and power engineering, Moscow, 1999] Topics of electrical engineering, basic concepts Synonyms earring EN thimble ... Technical Translator's Guide
- koush - thimble Kausche, Kauscheneinband - part of a hanging structure, the shape of the K. is round, long-lasting and in... Girnichy encyclopedic dictionary
- COUCH - a round or oval steel clip with a groove on the outside, inserted into the cable loop to protect it from abrasion. A bracket with a block for lifting a load, a hook, and another cable (or bolt) for fastening are threaded through the hole in the cable... ... Big Polytechnic Encyclopedia
- Koush - This term has other meanings, see Koush (meanings) ... Wikipedia
- thimble - 3.10 thimble: A metal loop clip at the end of the halyard at the point where it connects to the carabiner. Source: GOST R 12.4.184 95: System of occupational safety standards. Safety belts ... Dictionary-reference book of terms of normative and technical documentation
- A thimble is a rigging device in the form of a steel cage with a groove on the outside. The thimble is inserted into the loop of the cable to protect it from abrasion; a bracket or roller is inserted into the thimble for connection to a block or other cable. Source: Directory... ... Construction Dictionary
- KOUSH is a type of European halberd ... Encyclopedia of weapons
- A thimble is an iron ring that has a groove around the circumference of the rim, corresponding to the thickness of the rope into which the ring is spliced (embedded). K. protects the rope passing through it from friction with the rope into which it is inserted... Encyclopedic Dictionary of F.A. Brockhaus and I.A. Ephron
dic.academic.ru
The word KOUSH - What is KOUSH?
The word koush in English letters (transliterated) - koush
The word koush consists of 4 letters: k o u sh
Meanings of the word koush. What is a thimble?
Koush
Koush (Dutch kous (eye)) is a drop-shaped, round or triangular frame made of metal with a groove on the outside. The thimble is embedded in a cable loop (ogon) to protect it from abrasion and breakage. The loop is smoother.
en.wikipedia.org
KOUSH (from the Dutch. kous) - a round or oval steel cage with a groove on the outside. The cable is inserted into the loop of the cable to protect it from abrasion; a bracket or roller is inserted into the cable to connect the cable to a block, hook or other cable.
Big Encyclopedic Polytechnic Dictionary
A thimble is a metal ring with a groove along its outer surface. Thimbles: - are embedded in ogons, which serve to connect or fasten the main ends of the cable to the butts and eyes...
glossary.ru
KOUSH, an iron elongated ring, which on ships often ends the rigging gear, braiding the cable around the K.K. is grabbed by other gear using a hook or connects. staples, or sometimes the tackle passes through K’s point.
Military encyclopedia. — 1911—1914
A thimble is an iron ring that has a groove around the circumference of the rim, corresponding to the thickness of the rope into which the ring is spliced (embedded). K. protects the rope passing through it from friction with the rope into which it is inserted.
Encyclopedic Dictionary F.A. Brockhaus and I.A. Efron. — 1890-1907
Russian language
Koush, -ah, TV. -em (tech.).
Orthographic dictionary. — 2004
- cat
- Cooper
- hammer
- thimble
- cofactors
- cofactors
- coffee maker
wordhelp.ru
Koush is... What is Koush?
dic.academic.ru
KOUSH is... What is KOUSH?
polytechnic_dictionary.academic.ru
Where to buy steel thimbles?
Despite the emergence of high-strength polymers, steel remains the main material for making thimbles. The excellent performance characteristics of steel thimbles determine the high demand for slings made of wire ropes. TD "Stropkomplekt" sells a wide range of professional equipment for rigging work in St. Petersburg, Leningrad region, with delivery to any region of Russia at a reasonable, affordable cost. You can find out more details and place an order by calling toll-free 8 (800) 550-93-95 or by mail
Types of thimbles
According to their design and scope of application, thimbles are divided into round, cable-stayed, marine, acid-resistant, and wedge sockets. Let's take a closer look at their features.
Round cable holder
Synthetic rope thimble
