Monter's claws - purpose, types, instructions for use

Monter's claws and holes

offers individuals, organizations and public utilities services for testing equipment necessary for working at height. One of our activities is:

• Manhole testing;
• Test of the monter's claws.

Testing work is carried out in a modern laboratory equipped with specialized stands. Our employees are professionals who take their assigned tasks responsibly.

Inspection and testing: general principles

Claws and manholes used at enterprises must be inspected and tested for static loading every six months.
Before carrying out the next one, a complete visual inspection of the devices is carried out. If necessary, repairs are carried out, which may involve replacing the main parts. The devices are cleaned of dirt and dried at room temperature. Tip No. 2. It is not necessary to subject the straps used to secure the electrician’s foot to a load test. Their compliance with all current requirements is checked visually.

External examination of claws

A visual inspection of manholes and claws is carried out in order to identify damage visible to the naked eye, in the presence of which the devices are rejected. During the inspection of the claws, the technical condition and serviceability of all elements are checked:

• correct sharpening of the spikes;
• safety of the connection between the crescent element and the footrest;
• reliability of buckle seams;
• continuity of stitching of belts;
• the degree of tightening of the locking nut and the presence of a locking ring cotter pin.

Claw load test

Upon completion of the visual examination, identified deficiencies must be eliminated before testing the claws for static loading. The device, located in working condition, is loaded in the weakest section. The test is carried out on a wooden support stand with a diameter suitable for this claw model. The device must bear the load for 5 minutes without damage or rupture of welds, damage to the buckle or rupture of the belt. After release from the load, the presence of residual deformations is not allowed; their absence is checked by measuring the rise and alignment of the device before and after loading.

Visual inspection of manholes

When inspecting manholes, the condition is analyzed:

• bolts and connections;
• main components;
• removable plates;
• the presence of locknuts and cotter pins;
• belts and other fastenings.

The degree of sharpening of the removable plates, the reliability of their attachment, and for models of universal use, the condition of the cable loop nodes and the mechanism that regulates the opening of its solution are checked especially carefully. When checking the cable loop, the level of wear of the wires and branches of the paired spring tape and the quality of its attachment to the cable are revealed. Welding seams are checked for mechanical deformation and cracks. Damaged or sufficiently worn studs must be replaced with new ones.

Testing manholes under load

For testing under load, the manholes are placed on a stand in the working position, with the help of which the outlines of the lower part of the column are simulated. Upon completion of the inspection, the manhole is carefully inspected for residual deformations, tears in the fastening belts, cracks, and malfunction of the mechanism that regulates the opening of the cable loop. If at least one of the listed defects is detected, the hole is rejected and removed from the working stock.

Installer's claws for working on wooden supports

The design capabilities of assembler's claws for wooden supports, commercially produced in accordance with GOST 14331-77, are presented below:

• Type KM-1 – recommended support diameter 140...245 mm, throat 245±10 mm;
• Type KM-2 – recommended support diameter 220...315 mm, throat 315±10 mm;
• Type KM-3 - recommended support diameter 310...415 mm, throat 415±10 mm.

The platform of the KM series claws is stamped, with perforated holes, which makes it possible to increase the reliability of contact of the foot with the surface, while simultaneously reducing the weight of the platform. After stamping, the platform is hardened to a hardness of HRC 38...42. On one of the side surfaces of each platform there are ears for attaching steel arches. Along the remaining edges of the platform there are low sides, the presence of which prevents the electrician’s foot from accidentally slipping. To strengthen it during manufacturing, stiffening ribs are formed on the rear surface of the platform.

The fixing part of the arc rotates freely in the ears, ensuring the fixation of the spikes along the support at the moment of lifting the electric line operator. The permissible play should be no higher than ±15º.

The quick-wearing part of repairman's claws are the spikes, despite the fact that their initial hardness after hardening is 45...50 HRC. For claws on wooden supports, spikes are always made with conical tips. Experiencing significant frictional stress, steel spikes become dull and deformed over time. The durability of carbide studs is much higher, but they are sensitive to impacts and bending loads. Replacing the studs is not difficult, since their fastening part is threaded. The rear part of the platform is also equipped with spikes of a similar design.

The leg of the working person is attached to the arch of the claw using straps. In order to ensure elasticity, their upper part is made of yuft, and the lower part is made of rawhide impregnated with animal fat. The stitching of the belt elements is carried out with nylon threads, and the thickness of the belt and the diameter of the threads are calculated for a load of at least 140...160 kg.

Application area

Concrete hooks are designed to quickly lift a worker along a concrete or wooden power line pole to its upper section. Using personal equipment makes it possible to get the job done easier and faster than using a turret truck. It is not always possible to use special equipment. This depends on the terrain and urban density.

In manholes, an electrician is able to carry out installation and cable laying, carry out urgent repair work, and change lamp bulbs on wooden poles. Replacing lamps is often carried out through manholes, since due to the large number of lamp supports it is not financially profitable to use special equipment. It’s easier and faster for an electrician to climb up on his own.

Electrician's manholes for electrical installation on concrete supports

Working at height is always accompanied by great risk, so you need to use only proven equipment and follow all safety standards. There are many devices and mechanisms for lifting a specialist onto a concrete or wooden power line pole, but the fastest of them are considered to be claws made specifically for climbing poles, which can be factory-made or home-made. This article discusses questions about the use of these items, as well as types of claws and their purpose.

Claws for lineman

Types of claws of monter KM

Based on the classification according to their purpose, electrical installation claws are of the following types:

1. Crescent-shaped products have the shape of a semicircle, with a flat platform at the base. A person inserts his feet into this plane and secures them with special straps that fasten the toes and heels around the foot. These products are also called tree climbing claws, since they are usually used for climbing wooden supports with a circular cross-section;

Crescent holes

1. Laza monter claws or KLM 2 - these parts are fundamentally different from the sickle-shaped ones in their shape. Here, the elements of the hook have the form of straight sections with protrusions that tightly compress the plane of the pillar, and due to the pressure of the installer’s weight on the base of the platform, the entire structure is securely fixed to the support. This tool is universal and suitable for use on any type of poles, both wooden and reinforced concrete, since their size can be adjusted by moving the bar forward. Concrete supports come in various shapes: trapezoidal, rectangular, hexagonal or conical, so when choosing manholes you need to size them according to the cross-section.

Universal manholes

Despite so many types of supports for electrical cables, there are only two types of claws, so if it is not possible to use one of the proposed options, then you need to use a special aerial platform equipped with an installer’s cradle. This machine is capable of lifting several people to the work site at once; its cost, as well as the time it takes to complete the work, are high. Concrete lineman's manholes are an excellent alternative to aerial platforms, and they also allow you to eliminate an accident on the line in a much shorter period of time.

Areas of application of KLM2

The main purpose of this product is to quickly deliver a worker to the top of a power line support, for example, during installation and cable laying, as well as for urgent repairs. It is much easier and faster to deliver a repairman upstairs using claws, since it is not always possible to fit special transport, for example, in mountainous areas or in dense urban areas.

Automotive tower

Tree climbers are often used on poles with a circular cross-section to replace lighting lamps on the streets, since there are a lot of lamps, and it is constantly too expensive to transport special vehicles, so it is easier for the worker to climb the climbers himself and make repairs.

The set of claws for an electrician includes two feet, as well as a special waist belt, which is looped around the support and fastened to the belt with a carabiner. This eliminates the possibility of a worker deviating from the pole and disrupting the platform’s grip. Installer's claws of the name km 1 are freely inserted and removed from the support profile with a simple movement of the foot, the coupling is strengthened by the presence of spikes on the U-shaped frame, when pressure is applied to the platform by the weight of the installer, the pins are stuck into the concrete and increase contact with the surface.

Rules for using claws, safety precautions

Manufacturers of such products clearly regulate the standards for the use of claws and issue special instructions that must be followed during work. According to this document, for proper operation of installation holes you need:

1. Coordinate the action plan and work out in detail all actions on the ground. The installer must have all permits for work and undergo safety training;
2. Line repairs should be carried out with the power off, using insulating gloves and other rubber products;
3. Installer's manholes are used only for working on the supports for which they are intended; it is prohibited to use claws of an unsuitable shape, since the contact with the surface will be inaccurate;
4. Before using electrician's claws, you must check the last test date and all welds for corrosion and cracks. Bolted connections also need to be carefully inspected and tightened. Destruction of the platform at height can cause the installer to fall, which will lead to injury;
5. According to the manufacturer's standards, once every six months the claws must undergo technical tests, as a result of which a report is drawn up indicating the date of the next test;
6. It is important to always use the safety belt that comes with the climbs. It is prohibited to climb onto the support without this device or with a damaged mechanism;
7. Straps and buckles securing the electrician's foot should also be checked before each lift to ensure that the skin is not pulled or torn. If these defects are found, then the use of claws is not recommended;
8. It is strictly forbidden to climb on concrete supports along which the grounding line is laid, since the spikes can stick into the cable and pierce through it.

These rules are the basic safety precautions when working at height using electrical claws, so breaking them can lead to negative consequences. It is recommended to use only factory-made manholes, since home-made products do not undergo inspections and tests, as well as periodic certification.

Thus, claws for climbing concrete and wooden supports are an excellent alternative to a car tower with a mounting cradle; moreover, they are much cheaper and the work is carried out much faster.

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Electrician's manholes, their types and application

Depending on their purpose, concrete power line supports can have different cross-sectional shapes:

• centrifuged (round);
• rectangular;
• trapezoidal;
• polygonal.

Types of electrical supports for power lines

Each type of support (see photo) has its own design of devices for safe and convenient maintenance of lighting elements.

Classification and purpose of the tool

Installation manholes, regardless of the type of work performed, must be equipped as follows:

1. sickle (hook);
2. thorns;
3. step;
4. leather straps to firmly secure the fitter's feet.

Electrical installation manholes
The sickle is the working part of the device, made of pipes of the required diameter with fastening elements (spikes) attached to it. The footrest looks like a flat metal structure. The installer's foot is secured using durable leather straps with clamps attached to the body of the footrest.

We advise you to study - Ohm's law for a section of a circuit and a complete circuit: formulas and definitions

All parts of the devices are designed for safe operation within temperatures from -40 to +50°C, and with proper use they retain their positive performance characteristics for 36 months.

Depending on the type of work and the shape of the lighting stand, installation manholes for concrete have several varieties:

1. KLM (1–2) - claws of Laza montera. They are used for servicing trapezoidal and rectangular lighting poles. Hook opening 160–180 mm. The weight of the sets is respectively 3.7–5.4 kg.

Manholes KLM-1

1. LMC - manholes on concrete for climbing and descending round or multifaceted pillars. The opening of the working part is 305 mm. Set weight 4.20 kg. Permissible force 180 kgf/unit.

Device for centrifuged supports

1. LU - universal manholes with the ability to adjust the gripper opening. Grip opening 175–190 mm. The structure is adjusted using two bolts located on the device body. Product weight 5.8 kg.

LU-2

Necessary conditions for safe use of devices

The instructions for performing electrical installation work with your own hands provide for the following conditions:

1. An electrician performing work at height must undergo training at a specialized center and obtain the necessary certificate allowing independent work.
2. Before starting work, you must carefully inspect the device and make sure that all connections are secure, including the condition of the belts for securing the tool.
3. The fixing belts must be made of two-layer fat-impregnated leather for installation work in any climatic conditions. The required belt thickness is 3 mm or more. The belt buckle must be made with a protective and decorative coating.
4. Metal elements of manholes should not have cracks, dents, breaks or sharp burrs. Welding seams of connections must be smooth without visible defects. Working spikes should not be beveled and have the required geometric shape.
5. The spikes of the device must move freely in the horizontal plane, but at the same time, the vertical play should not exceed 1 mm.

Safety belt

The video explains the rules of claw climbing and climbing.

Analysis

Repeat

Care, storage, service life

Manholes are a universal device; they can be used in almost any climate zone with a temperature range from minus 40 to 50 degrees above zero. This means that work on power lines can be carried out both in the northern regions and in hot and sultry conditions.

The service life is indicated by the manufacturer. Time is counted from the moment the products are put into operation. No later than a year later, such a tool must be removed and recycled or disposed of. The maximum operating life of manholes is 60 months. Components are changed during operation as needed. The warranty period is usually 1 year from the moment the product is put into operation.

Store the device in a temperature range from minus 20 to 30 degrees above zero. It is unacceptable to store manholes in a room with an open roof; precipitation will leave a sharply negative mark on the quality of the devices.

Monter's manholes do not require special care. After use, they must be cleaned, any remaining dirt must be removed with a rag and stored away. Do not wash under water or wipe with wet material.

In conclusion of our article, we suggest watching a video of how assembly manholes are made and how to correctly lift using them:

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Review of brands and manufacturers

The following companies deserve mention and are trusted by consumers:

• CJSC "Potential";
• electrical engineering plant KVT;
• production association "ZMO".

(Nizhny Novgorod)

Installer's claws No. 2, manufactured (Nizhny Novgorod) are used for electrical installation work on wooden vertical supports or wooden poles with reinforced concrete attachments for overhead power lines. The opening of the device is 315 (±10) mm, the lift is 160 (±10) mm.

• The diameter of the supports allowed for use is 220-315 mm.
• The cost of the device is about 2-2.5 thousand rubles.
• The main characteristics of claws No. 2 2 are presented in the table.

Products of the KVT enterprise (KVT electrical plant)

The KVT enterprise produces the popular and sought-after model of KLM claws in two versions - KLM-1 and KLM-2. Both options are used for work on trapezoidal overhead line supports.

• KLM-1 ensure safe operation on columnar supports of types SV110-1a and SV110-2a. The claw length is 168±4 mm, weight is 5.3 kg. The price of KLM-1 claws, depending on the region, is 2.2-2.8 thousand rubles.
• Claw-holes KLM-2 weighing 5.4 kg and opening 190±4 mm are widely used for posts SV105-3.6 and SV105-5. The cost of the device is approximately 3.5 thousand rubles.

Comparative characteristics of the KLM-1 and KLM-2 claws are presented in the table.

Production Association "Installation Equipment Plant"

The production association "Installation Equipment Plant" boasts two popular models. KM-1 claws are widely used for work on wooden and wooden with reinforced concrete inserts power transmission line supports, on communication line poles with a circumference of 140-245 mm.

• The forged sickle and spikes are made from reliable 40X steel and are supplied with leather straps. The device's opening is 245±10 mm with a fairly low mass of 3.6 kg. The cost of KM-1 ranges from 2400 to 2900 rubles.
• Universal switchgear manholes are used on supports of trapezoidal cross-section of overhead lines of the SV110-1a, SV95-1(2a), SV105-5 and SV105-3.6 brands. The manhole has an adjustable opening in the range from 168 to 190 mm. Reliable adhesion to the surface of the supports is ensured by carbide spikes. Supplied with leather straps.
• The weight of the product is approximately 5 kg.
• KRU manholes can be purchased for 2900-3700 rubles.

Comparative characteristics of KM-1 claws and KRU manholes are presented in the table.

Terms of use

There are special instructions for electricians that tell you how to use electrician's claws. First of all, it is necessary to take certain safety measures when performing various works in electrical networks, especially on power lines.

1. Before starting work, you need to agree on the procedure, draw up all the necessary documents, prepare the workplace and allow workers to complete the task. These measures are extremely important and necessary in order to protect workers. For example, when an electrician is working, voltage may be applied to live parts (namely wires).
2. You need to be able to properly use the protective insulating equipment used during work.
3. Installer's claws are used exclusively for those supports that are indicated in the device's passport.
4. Before starting work, you need to check the product for damage and check the test date. In this case, yarns and belts, bolted connections, welds, fasteners, and spikes are checked. Electricians who use assembly claws must undergo additional instruction and training. They are also tested on their knowledge and checked whether they have a record of permission to carry out the work independently.
5. Twice a year, claws and holes should be sent for inspection. This is necessary in order to detect and correct a defect or malfunction in a timely manner.
6. If the integrity of the device is compromised (for example, there is a crack or a hangnail), then they are not allowed to be used.
7. In addition to the structure itself, before carrying out work, you need to separately check the safety belt and climb the pole only with it.
8. It is prohibited to change anything in the structure of the device or its belts.
9. It is strictly forbidden to climb a pole through which fault currents passed to the ground.
10. The structure must be stable and integral.

We advise you to study - Malfunctions of lamps with fluorescent lamps and their repair

The video below clearly demonstrates how to use lineman's claws when climbing onto a support:

Hand tools

4.3.1. Hand tools must meet the following requirements:

wooden handles must be made of hard and tough wood, smoothly processed and securely fastened;

the working part of the tool should not have cracks, burrs or chips.

4.3.2. Hand tools must be inspected by a senior electrician at least once a quarter, as well as by the employee using the tool immediately before use. The faulty instrument must be removed.

4.3.3. Bench hammers must be made in accordance with GOST 2310 from steel grades 50.40X or U7. The working ends of the hammers must have a hardness of 50.5-57 HRC at 1/5 of the length at both ends.

4.3.4. The use of files, scrapers, screwdrivers without handles and bandage rings on them or with poorly secured handles is not allowed.

4.3.5. The handles (handles) of shovels must be smooth and firmly fixed in the holders.

4.3.6. The crowbars and mountings used during work must be smooth, without burrs, cracks or hardening.

4.3.7. Chisels, punches, bits must be made in accordance with GOST 7211, GOST 7213, GOST 7214 from steel grades U7, U7A, U8 or U8A. Chisels and bits should not have cracks, hairs, knocked down or beveled ends. The cutting edge of the chisels is hardened to 0.3 - 0.5 of the total length and subjected to tempering. The working part of beards, notches, cores, etc. hardened to a length of 15-25 mm. The back of the instruments must be smooth, without cracks, burrs or hardening. There should be no damage to the working end.

4.3.8. The shape and dimensions of the wrenches must comply with the requirements of GOST 6424, GOST 2838 and GOST 2839.

Single-sided wrenches must comply with the requirements of GOST 2841.

The jaws of the keys must be strictly parallel and not rolled up. The dimensions of the wrench mouth must correspond to the dimensions of the nuts and bolt heads. The dimensions of the wrench mouth should not exceed the dimensions of the nuts and bolts by more than 5%.

4.3.9. The handles of pliers and hand scissors should be smooth, without dents, nicks or burrs. There should be a stop on the inside to prevent pinching of the fingers.

4.3.10. The vice must be manufactured in accordance with GOST 4045, firmly attached to the workbench so that its jaws are at the level of the worker’s elbow. If necessary, wooden ladders should be installed along the entire length of the working area. The distance between the axes of the vice must be at least 1 m. The vice must ensure reliable clamping of the product.

The jaws of the vice must be parallel, have a notch and provide reliable clamping of the workpiece.

4.3.11. Before use, hand-held plumbing tools must be inspected in order to remove and repair faulty ones.

4.3.12. Tools with insulating handles (pliers, pliers, side and end cutters, screwdrivers) must:

have dielectric covers or coatings without damage (delamination, swelling, cracks) and fit tightly to the handles;

stored indoors, without touching heating radiators and protected from sunlight, moisture, and aggressive substances.

4.3.13. Testing of tools with insulating handles must be carried out in accordance with the requirements of the Rules for the Application and Testing of Protective Equipment Used in Electrical Installations and technical requirements for them.

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Structure

Monter's manholes (claws) are a design of two main parts:

• metal hook;
• belt.

The hook has the shape of a trapezoid or rectangle. For strong adhesion to the support, it is equipped with teeth and self-adjusting spikes. The belts are made of genuine leather, sewn in two layers. The total weight of the structure is from three to five kilograms.

The laz works using momentum: different levels of spikes allow the hooks to be more firmly fixed under the influence of a person’s weight. The more weight, the better the grip. The gravity of the body, whatever it may be, will create the necessary moment of momentum, allowing you to maintain the required mass.

Care, storage, service life

from - 40 to + 50 degrees

Each product has a certain service life, which must be indicated in the labeling. Its starting point is the moment when the device was first used for its intended purpose. However, after a year of active use of the tool, operation is stopped, and the tool is sent for recycling or disposal. All manholes have a service life limit of 60 months. To safely perform work on power lines, it is necessary to regularly change components. If all requirements for production technology are met, such a device can work effectively for a year from the moment it is put into operation.

Manhole storage

It is unacceptable to leave claws for storage in the open sun or in rooms where a humid environment is maintained. In order for the manholes to retain their quality characteristics even after the inactive period of operation, they must be kept in a warehouse where an average temperature regime is maintained and ventilation is provided.

If any part is faulty, then a specialist should not repair them if he does not have the necessary experience and knowledge. If any element of the tool is faulty, then it is unacceptable to use it.

In order for assembly manholes to perform their task equally effectively, they do not need to provide special care. To do this, it is enough to clean them from dirt after each use, using any rags, after which they are placed in a storage place. It is unacceptable to use wet material to clean claws.

Design and principle of operation

The simplest manholes for concrete supports consist of 2 elements for attaching to shoes, each of which consists of the following main components:

• Oval foot support with transverse reinforcements;
• 2 straps holding the foot on the platform;
• “Sickle” is a rectangular grip with 4 conical spikes attached at an angle of approximately 600 to the supporting platform.

Climbing onto a reinforced concrete pole using a similar device occurs as follows:

• The electrician securely fixes the manholes on his shoes using belts;
• Approaching the pillar, he grabs it with the grips of each of the elements of the claws;
• The electrician climbs the pole, thanks to the fact that the claw grips, which he alternately rearranges in the vertical plane, located at an angle to the supporting platforms, bite into the concrete with their spikes and prevent slipping.

Using a similar principle, electrical claws designed for this type of support help you climb onto a wooden pole. Their only differences from the crampons used for concrete pillars are the semicircular shape of the grips and softer spikes.

For legal entities:

1. Contact us by phone or send a request on our website

2. Send by email copies of the constituent documents and details of the organization for drawing up an agreement and issuing an invoice

3. Sign the lease agreement on your part and pay the invoice for rental services

4. Come to our office or warehouse with a power of attorney from the organization and pick up the equipment.

Payment accepted:

• Cash
• To Sberbank, Tinkov cards
• Cashless payment with VAT
• Cashless payment without VAT

Delivery

Delivery is carried out within the city at a cost of 150 rubles one way.

Delivery outside the city and intercity is carried out by agreement.

Safety Precautions - Inspection and Testing

When using this device, specialists working at height must have additional equipment in their arsenal in the form of a protective helmet, which will protect against an accidental blow, as well as a safety lanyard, which will help to avoid serious consequences.

Straps for fastenings should also be available. The design of the belts must guarantee convenience and reliability in use, therefore their thickness must be at least 3 mm. These devices are made of two-layer leather, which is impregnated with fat. Each access hole must be marked with the date of the next inspection.

Before climbing to a height, you should thoroughly inspect the claws and check the test date. In addition, it is necessary to ensure the reliability of the welds, the integrity of the spikes, and the serviceability of the worm mechanism.

The metal elements of the device must not contain dents, breaks, sharp edges, cracks, or burrs. The spikes must not be damaged, beveled or knocked down. It is prohibited to use claws whose spines are blunt or absent altogether.

The device must be loaded for five minutes, with the load passing through the center point of the footrest. Before testing, a visual inspection is carried out to ensure that all parts are fastened and that there is no damage to the belt firmware. The fixing nut must be tightened with a locking ring.

In addition, the correct sharpening of the spikes is checked. The tests are carried out on a wooden support, the diameter of which corresponds to the numbering of the claw. After testing on the claws and manholes, there should be no deformation of the elements, damage to the welds, or breakage of the belts. Then measurements are taken, which are compared with previous values ​​and recorded in a special journal.

If, after loading, defects are revealed, then such devices must be repaired; spikes and other damaged components are replaced. After troubleshooting, the device is again subjected to load.

Legislative framework of the Russian Federation

Free consultation

Federal legislation

• home
• “INDUSTRY RULES FOR OCCUPATIONAL SAFETY DURING MAINTENANCE AND REPAIR OF SIGNALING, CENTRALIZATION AND INTERLOCKING DEVICES ON FEDERAL RAILWAY TRANSPORT. POT RO-13153-TSSh-877-02" (approved by the Ministry of Railways of the Russian Federation on February 19, 2002)

Monter's claws and manholes

4.2.24. Assembly claws must comply with the requirements of TU 34-09-10147-88. The claws are designed to work on wooden and wooden with reinforced concrete stepson supports of power transmission and communication lines, on reinforced concrete supports of overhead power lines (OHT) 0.4 - 10 and 35 kV, as well as on cylindrical reinforced concrete supports with a diameter of 250 mm of 10 kV overhead power lines.

4.2.25. Metal parts of claws and manholes should not have dents, cracks, breaks, burrs, or sharp edges. Welding areas must be level, smooth, without cavities or other defects.

Removable tenons must not be knocked down or beveled.

4.2.26. By order of the workshop or area in the organization, persons responsible for the good condition of the claws and manholes must be appointed.

4.2.27. Claws and manholes must withstand a static load of 1765 N (180 kgf) without permanent deformation.

4.2.28. The service life of claws and manholes (except for spikes) is 5 years.

On the foot of the claw, the hole should be applied:

a) manufacturer's trademark;

c) date of manufacture.

4.2.29. The use of claws and manholes that have blunted or broken spikes is not permitted.

Care, storage, service life

The effectiveness of the claws is that they can be used at any temperature from -40 to +50 degrees. This device can be used in work both in hot areas and in the far north.

The invention is used only for a limited period. With constant use, the claws are used for no more than a year. The maximum service life is 5 years. In addition, it is recommended to periodically replace components. When using this method of lifting onto air supports, you must strictly follow the operating rules specified in the instructions.

The best storage temperature for the device is considered to be from -20 to +30 degrees. This will not interfere with its effectiveness in use. In order not to spoil the functional properties, repair claws are stored in a dry, well-ventilated area. Also during storage it is necessary to avoid sunlight.

In addition, to preserve the manholes, it is necessary to clean them from dirt and wipe them dry after each use. If the claws are wet, they must be dried and taken to a warehouse or other room that maintains the required temperature for storage and ventilation.

We advise you to study - Open and closed loop regulation in control and automation systems

If one of the device components breaks down, its further operation is strictly prohibited. Repairs should only be carried out by a specialist in the field.

Selection rules

To make the right choice of claws, you need to have some knowledge in this area. When choosing a device, you should pay attention to the following nuances:

Product price. In this case, it is worth remembering that cheaper versions of the claws may use insufficiently high-quality metal, as a result of which the device will be unreliable and dangerous. Focus on medium or high price, which guarantees quality.

Manufacturer. As you know, it is better to trust proven and well-known manufacturers.

Quality. Products must comply with current GOST or TU and have quality certificates. Upon external inspection, no defects or unevenness of the seams should be noticeable. The thickness of the belts must be at least 0.3 mm, the stitches must be even and securely fixed.

Operating rules

Work at height has an increased danger, which is why there are a number of rules for its implementation and operation of equipment. Every worker - a high-altitude worker, an electrician - must know and apply the following rules for using assembly claws.

• The equipment may only be used for its intended purpose. This means that when climbing up a concrete base, you need to use claws that are designed for that material.
• You must adhere to safety rules.
• It is worth considering the technical characteristics of the claws, because each model has a certain maximum load capacity.
• Before putting on the device, it must be checked, namely the spikes and belts for deformations. Every bolt, tenon, strap and fastener must be free of damage. If defects are found on at least one of the parts, it is strictly not recommended to use the equipment.
• Carefully study the product data sheet. The document must indicate the expiration date and dates of mandatory inspections.
• You need to have your claws checked at least twice a year.

Also, experts do not recommend using claws from dubious and little-known manufacturers in high-altitude work.

There is a certain permissible operating temperature, which is also indicated in the product passport.

Watch the video about monter's claws below.

Types and their characteristics

You can purchase the required type of manholes by deciding on their purpose. If you plan to work on wooden poles, then you should buy one type of device. When working on concrete supports, a different type is chosen.

Manholes are divided into several types:

• lineman's claws (for round metal and wooden poles), now they are practically not used;
• assembly manholes for concrete (for round or trapezoidal concrete pillars), very common;
• Installer's manhole claws (for supports made of reinforced concrete in the shape of a trapezoid) are quite popular, the opening of the manholes is adjustable, which allows them to be used on any support.

Where and how to use a safety lanyard, read in this publication.

A safety harness is used to cover the worker’s body to prevent him from being caught in the future. What are the requirements for a harness, read here.

Product selection criteria

Smooth-haired cats lead a very active lifestyle and love to climb trees and claw at each other. A sharpener for them can be made from thin twigs that are equipped with bark. Fluffy cats are less active and more phlegmatic. They are not characterized by high activity and have no desire to climb branches. For such cats, you need to make a stable sharpener with a resting area.

Do not place the product near your sleeping area. Home safety is important for a cat , and he will not tolerate unnecessary objects near the house. This arrangement will cause anxiety in the cat; most likely, he will move away from such a complex.

The exception is cats of wild breeds. A Siamese, Bengal, or Abyssinian cat will be quite happy with a complex in which there will be a house and a sharpener. In nature, they live in trees, and therefore such close proximity of two favorite places is the norm for them. Experts advise making a bench and inspection platform on a pole. It must be branched enough to allow the animal to move around the scratching post. If it is not possible to buy a wooden pole, then you can build such a tree from cardboard tubes.

What it is?

Claws or claws are special devices for lifting a worker onto a power line pole. They are fixed on a person’s legs and make it possible to gain a foothold on a support and stay in one position for the required amount of time. The structure of the manholes will be improved to increase the reliability of the equipment and the speed of climbing to the top. There are three groups of such devices:

It is convenient to climb the round pillars using universal equipment.

• Lazy. Designed for lifting reinforced concrete structures of round and trapezoidal shape in section.
• Universal hooks. The installation tools are suitable for round pillars made of concrete or wood. The latter have lost their relevance.
• Claw-holes. They differ in structure. Equipped with a specific control solution, especially effective in relation to trapezoidal reinforced concrete supports.

The latter devices are used more often than other types, because their specificity allows this device to be used to work with all types of standard supports. The use of manholes is permitted if this possibility is confirmed by accompanying documents. Each company specializing in electrical installation has its own set of tools for servicing power lines.

Operating rules

Each enterprise involved in the operation and maintenance of power lines must develop its own instructions for the use of manholes. However, the main sections of the rules do not differ significantly. The main message of the instructions is that personnel must be able to operate tools and devices, which include claws. Among the basic rules are:

• The devices should only be used on the types of poles specified in the instructions.
• Before starting work, you need to make sure that the claws are in good condition.
• During the inspection, all connections, tenons and fasteners should be inspected.
• Personnel performing work at height using manholes must undergo training and then pass an exam. After this, a permit is issued to carry out the work independently.
• Devices must undergo mandatory inspection once every six months.
• If a design malfunction is detected, the claws and manholes must be removed from the working stock.
• Before starting work, the employee must check not only the device itself, but also the safety belt.