RU2741999C1 - Universal manual electric tool for removal of insulation from wires - Google Patents

Abstract

FIELD: electrical engineering.

SUBSTANCE: proposed device relates to the field of electric engineering, namely to the technological tool for preparation of wires or cables for installation, and can be used in electric, radio engineering and instrument making industries. Claimed universal manual electric tool for removal of insulation from wires consists of two pivotally connected levers. Each lever on one side to the axis of rotation is made in the form of a sponge containing a conductive knife, and on the other side in the form of a handle coated with electrically insulating material. A spring is installed between the handles. Sponges in area of current conductive knives arrangement contain insert from electrically insulating material. Limiting projection is arranged on first handle inner surface. On inner surface of second handle there is a cutout for limiting ledge of first handle. Inside the second handle there is an electric accumulator, a control unit, an electric connector and a linear electromechanical drive. One of the surfaces of the core of the linear electromechanical drive forms an angle with the axis of its movement and is made relief. Levers have channels for wires, through which one terminal of electric accumulator is connected to one current-conducting knife, and the other output is connected through control unit and linear electromechanical drive to another current-conducting knife.

EFFECT: universality of the tool, which consists in possibility of its use for cleaning of wires with wide range of sizes of conductor cross-sections, as well as in case when wire marking is absent or does not correspond to cross-section.

1 cl, 5 dwg

Description

The claimed device relates to the field of electrical engineering, namely to a technological tool for preparing wires or cables for installation, and can be used in electrical, radio engineering and instrument making industries.

Almost all branches of modern industry have radio-electronic equipment, which plays an important role in the development and production of complex products. The main junctions of radio-electronic equipment are bundles, which include a large number of wire names with a wide range of cross-sectional sizes of conductors. The number of such wires and circuits in them can often reach several hundred.

Despite the development of production automation, the assembly of harnesses, namely, the removal of insulation from the wires before installation in electrical connectors, is often carried out using hand tools, due to the specifics of certain products and the impossibility of automating some assembly stages. Constant adjustments or frequent tool changes lead to an increase in the production time of the final product, and this is only one of the significant disadvantages.

You know a device for stripping electrical wires from insulation [1. A.S. 433578 SU, IPC H02G 1/12. Device for stripping electrical wires from insulation / Gorodov I.M., Kuptsov G.K. - Applied. 01/21/1972; publ. 06/25/1974, Bul. No. 23.], In which the knives are connected in series in the control circuit for disabling the drive of their movements.

The disadvantage of this invention is the limited length of the stripped insulation. The device is not suitable for stripping wires in tight installations, for example, when making electrical harnesses in hard-to-reach places such as junction boxes.

Known protection system and method for stripping cable insulation [2. Pat. 109193480 CN, IPC H02G 1/12. A protection system and a method of a cable stripping device / Wang Xiaohung et al. - Appl. 10/18/2018; publ. 11.01.2019.]. The invention comprises a proximity sensor located on the cutting element. At the beginning of work with the tool, the circuit is open. When the cutter touches the conductor of the cable to be stripped, the detection circuit is activated and generates a signal to raise the cutter.

The aforementioned software-controlled equipment is rational to use only in large-scale production. This system is stationary and requires a permanent power supply.

Known device for stripping the insulation from the ends of the wire [3. Pat. for PM 144866 RU, IPC ⁶ H02G 1/12. Device for stripping insulation from the ends of the wire / Kuleshov B.N., Ilchenko E.K. - Applied. 02/04/2014; publ. 09/10/2014, Bul. No. 25.], Containing the firing elements connected by a spring, located on the handles pivotally connected by the axis, made in the form of arcs. Each arc is connected to a power source via a microswitch. When the handles are squeezed, the power contact is closed, the firing elements heat up and melt the wire insulation.

The disadvantages of the invention are high energy consumption, possible overheating of the current-carrying conductor and, as a consequence, fire hazard. For the operation of the device, it is necessary to organize a specially equipped place that meets safety requirements, as well as a constant power source. The impact of hazardous and noxious vapors during such work is noted in the Technical Specifications for any wire with fluoroplastic or polyimide insulation.

Known new electrical pliers for removing wire insulation [4. Pat. 109088358 CN, IPC H02G 1/12. Novel electric measuring type wire stripping plier / Ding Lei - Appl. 06/13/2017; publ. 12/25/2018.], Containing a stop pin adjustable by rotation of a spring-loaded button that protects the wire core from damage during stripping.

Known device for stripping cable insulation [5. Pat. 2179357 RU, IPC (2000.01) H02G 1/12. Device for stripping cable insulation / Dimov A.G., Zakhmatov N.V. - Applied. 10/16/2000; publ. 02/10/2002, Bul. No. 4.], in which the knife blades on both sides cover the element for limiting the depth of cut of the knife with the end resting on the cable sheath in the cut zone.

The disadvantages of the devices [4., 5.] lie in the need to pre-set the tool for a certain cross-sectional diameter of the wire core, which significantly reduces productivity, for example, in the manufacture of typeset bundles with wires of different cross-sections, as well as in the inability to remove the insulation from the wire without marking or the case when the marking of the wire does not correspond to the section.

The aim of the claimed invention is to create a reliable universal hand-held power tool for stripping wire insulation.

The claimed universal hand-held power tool for stripping the insulation consists of two articulated arms. Each lever from one side to the pivot axis is made in the form of a sponge containing a conductive knife, and on the other side - in the form of a handle covered with an electrically insulating material. A spring is installed between the handles. The jaws in the area of the conductive knives contain an insert made of electrically insulating material. On the inner surface of the first handle is a limiting protrusion. On the inner surface of the second handle a cutout is made for the limiting protrusion of the first handle. Inside the second handle are an electric accumulator, a control unit, an electrical connector and a linear electromechanical actuator. One of the surfaces of the core of the linear electromechanical drive forms an angle with the axis of its movement and is embossed. The levers have channels for wires through which one terminal of the electric battery is connected to one conductive knife, and the other terminal is connected to another conductive knife through the control unit and a linear electromechanical actuator.

The claimed invention is illustrated by drawings.

FIG. 1-4 shows an embodiment of a universal hand-held power stripping tool. FIG. 5 shows the wiring diagram for connecting the tool.

The tool consists of two pivotally connected levers, made on the one hand to the pivot axis 1 in the form of handles 2, 3 covered with an electrical insulating material, and on the other hand - in the form of jaws 4. A spring is located between the handles 2, 3 5. The jaws 4 contain inserts 6 made of electrical insulating material, conductive knives 7, 8 and channels 9 for wires. The handle 3 contains an electrical connector 10 for charging an electric battery 11 from a power source, a control unit 12 and a linear electromechanical drive 13 of a pushing type. On the inner surface of the handle 3, a cutout 14 and a hole 15 are made for a wire running from an electric battery 11 to a conductive knife 8. The linear electromechanical actuator 13 has a return spring 16 and a core 17, one of whose surfaces forms an angle with the axis of its movement and is embossed. A limiting protrusion 18 is located on the inner surface of the handle 2.

FIG. 3 shows sponges 4 with inserts 6 made of electrical insulating material and conductive knives 7, 8 in a closed form, a wire 19 with insulation 20 and a conductive core 21. A minimum gap is maintained between the conductive knives 7, 8 to exclude the occurrence of electrical connection until they come into contact with the conductive residential 21 wires 19.

FIG. 4 shows the closed state of the electrical circuit: the handles 2, 3 in the compressed state, the core 17 in the extended position and the limiting protrusion 18 in contact with it through the cutout 14.

The work of the proposed instrument is carried out as follows. In the initial position, the jaws 4 of the tool are open due to the spring 5 installed between the handles 2, 3. The first outlet of the electric battery 11 through the control unit 12 and the linear electromechanical drive 13 is connected to the conductive knife 7 by a wire passing through the channel 9 for the wire in the handle 3. The second outlet The electric battery 11 is connected to the conductive knife 8 by a wire coming out of the hole 15 of the handle 3 and passing through the channel 9 for the wire in the handle 2.

In the initial position of the tool, the electrical circuit is open, there is no electrical connection between the conductive knives 7, 8, the return spring 16 of the linear electromechanical actuator 13 holds the core 17 in the housing of the linear electromechanical actuator 13. Wire 19 is placed between the conductive knives 7, 8 and squeezes the handles 2, 3 When the conductive knives 7, 8 pass the wire 19 at the moment of their contact with the conductive core 21 (or, depending on the task, the metal shielded braid of the cable), the electrical circuit is closed. The current coming from the electric battery 11 creates a magnetic field in the electromechanical drive 13, pushing the core 17 along its longitudinal axis from the body of the electromechanical drive 13.

When the handles 2, 3 are compressed, the limiting protrusion 18 of the handle 2 enters the cutout 14 of the handle 3 and abuts against the pushed out core 17, while the handles 2, 3 are blocked, thereby preventing the user from squeezing the tool further. After that, the insulation 20 is removed from the wire 19 by rotationally pulling force.

Due to the geometry of the core 17, the point 22 of contact between the core 17 and the limiting protrusion 18 can be anywhere on the surface 23 of the core 17, depending on the cross-section of the strands of the stripped wires. The embossed surface 23 prevents the protrusion 18 from slipping over the surface 23 and the core 17 being pushed into the housing of the linear electromechanical actuator 13 when excessive force is applied to the handles 2, 3.

The control unit 12 counteracts the inductance emissions of the linear electromechanical drive 13 when the circuit is closed-open, which ensures the reliability of the tool.

The technical result is the versatility of the tool, which consists in the possibility of its use for stripping wires with a wide range of sizes of conductor cross-sections, as well as in the case when the wire marking is absent or does not correspond to the cross-section.

The technical result is achieved due to:

- the presence of insulating material inserts in the sponges;

- placing a limiting protrusion on the inner surface of one handle and making a cutout for it on the inner surface of the other handle;

- placement of the electric battery, control unit, electrical connector and linear electromechanical actuator inside the handle with a cutout;

- geometry and surface relief of the core of a linear electromechanical drive;

- the presence in the jaws and handles of the instrument channels for the wires of the electrical circuit.

The claimed tool has a number of advantages:

- prevention of damage to the conductive core of the stripped wire due to the speed of the blocking mechanism;

- reliability of operation due to the introduction of a control unit into the design, which prevents the appearance of a spark on the knives and subsequent burning of the stripped wire when the electrical circuit is closed;

- portability due to the presence of an electrical connector for charging an electric battery;

- reduction in time costs due to the absence of the need to adjust the tool for the selected wire section;

- a positive economic effect, consisting in the low cost of the tool due to the simplicity of the design, as well as in the reduction of the number of wires damaged during the stripping process.

The device can be made using standard equipment and materials of domestic production. Thus, the claimed device meets the criterion of "industrial applicability".

Sources taken into account

1. A.c. 433578 SU, IPC H02G 1/12. Device for stripping electrical wires from insulation / Gorodov I.M., Kuptsov G.K. - Applied. 01/21/1972; publ. 06/25/1974, Bul. No. 23.

2. Pat. 109193480 CN, IPC H02G 1/12. A protection system and a method of a cable stripping device / Wang Xiaohung et al. - Appl. 10/18/2018; publ. 11.01.2019.

3. Pat. for PM 144866 RU, IPC ⁶ H02G 1/12. Device for stripping insulation from the ends of the wire / Kuleshov B.N., Ilchenko E.K. - Applied. 02/04/2014; publ. 09/10/2014, Bul. No. 25.

4. Pat. 109088358 CN, IPC H02G 1/12. Novel electric measuring type wire stripping plier / Ding Lei - Appl. 06/13/2017; publ. 12/25/2018.

5. Pat. 2179357 RU, IPC (2000.01) H02G 1/12. Device for stripping cable insulation / Dimov A.G., Zakhmatov N.V. - Applied. 10/16/2000; publ. 02/10/2002, Bul. No. 4.

6. Pat. 2538223 RU, IPC ⁶ V25V 7/22, G02B 6/25, G02B 6/36. Instrument for processing optical fibers / Dirks K., Hanning G. - Appl. 06/16/2010; publ. 27.12.2011, Bul. No. 36.

7.A.S. 165205 SU, IPC H02G 1/12. Device for stripping and testing multicore cables with monolithic plastic insulation of conductors / Kobyakov L.N., Lipskaya V.G. - Applied. 03/05/1963; publ. 09/23/1964, Bul. No. 18.

8.A.S. 111853 SU, IPC H02G 1/12. Device for stripping insulation from the ends of coaxial cables / Volkov N.N. - Applied. 03/05/1956; publ. 11/30/1957.

9.A.S. 126925 SU, IPC H02G 1/12. Hand tool for removing vinyl insulation from the end of a wire or cable / Levin B.V. - Applied. 06/29/1959; publ. 11/30/1960, Bul. No. 18.

10.A.S. 140843 SU, IPC H02G 1/12, В26В 17/02. Manual tool for the production of electrical work / Fateev V.F. - Applied. 02/11/1961; publ. 11/30/1961, Bul. No. 17.

11. Pat. for PM 19228 RU, IPC (2000.01) H02G 1/12. Device for stripping wire insulation / Komissarov A.I., Lavrov V.D. - Applied. 10/09/2000; publ. 10.08.2001, Bul. No. 22.

Claims (1)

A universal hand-held power tool for stripping insulation from wires, consisting of two articulated levers, each of which, on one side to the pivot axis, is made in the form of a sponge containing a conductive knife, and on the other side as a handle covered with an electrical insulating material, and installed between the handles spring, characterized in that the jaws in the area of the conductive knives contain an insert made of electrically insulating material, a limiting protrusion is placed on the inner surface of the first handle, a cutout is made on the inner surface of the second handle for the limiting protrusion of the first handle, and an electric battery is placed inside the second handle, a control unit , an electrical connector and a linear electromechanical drive, one of the surfaces of the core of which forms an angle with the axis of its movement and is embossed, the levers have channels for wires through which one terminal of the electric battery is connected to one conductive knife, and the other output is connected to another conductive knife through the control unit and the linear electromechanical drive.

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