Tip for corrugated hose and set of elements with such tip

FIELD: machine building.

SUBSTANCE: tip for a corrugate hose comprises a bushing with a front section and a rear section lying opposite in a longitudinal direction and being in a mounted condition of a bushing inside the corrugated hose. The front section of the bushing comprises an edge forming a groove stretching along the bushing perimetre to install a free end of the corrugated hose in it. The rear section of the bushing comprises multiple spring tabs, characterised by direction of unloading perpendicular to the longitudinal direction of the bushing and aligned in direction to the external space of the bushing. At least a part of spring tabs comprises radially arranged stop ledges to ensure locking acting in the longitudinal direction of the bushing. A stop cartridge accurately placed in the bushing, which in the mounted condition is arranged in the inner space covered by the bushing, limits the radial gap of spring tabs. There are sets of elements described with the specified tip.

EFFECT: invention improves device connection reliability.

16 cl, 5 dwg

 

The invention relates to a handpiece attached to the free end of the corrugated hose, and to the set of elements with the same tip.

Corrugated hoses or tubes, hereinafter referred to generally corrugated hoses are used in many areas as a protective pipes for used products, such as cables or pipes. Depending on the scope of used corrugated hoses made of metal or plastic. If cable channels in buildings are mainly used corrugated hoses, of plastics, the NPPs apply due to exposure mainly corrugated hoses made of metal. During installation corrugated hoses are cut to the appropriate length. After cutting corrugated hose at its free ends form sharp cutting edges. They represent a danger of injury to installers and additionally placed in the corrugated hose cable can be wiped with these sharp cut edges. In addition to construction and NPP this problem also captures robots and other machines in which the cable into the corrugated hose is fed to the rolling element structure.

In addition, nuclear power plants there is pressure to perform the installation with minimal use of tools, POSCO is jku each tool, which should be made in the area of safety of nuclear power plants, requires considerable effort to implement security measures.

The present invention is to create a tip for corrugated hose and set of elements with the same tip, which decreases the danger posed by the free ends of the corrugated hose with sharp edges, and which can easily be installed.

The problem is solved according to the invention by means of the tip, characterized by signs of paragraph 1 of the claims, and by means of a set of elements, characterized by signs of paragraphs 14 or 15 formula. Preferred embodiments of the disclosed in the dependent claims.

The handpiece according to the invention, intended to be installed on the free end of the corrugated hose, includes a sleeve with a front section, facing the free end of the corrugated hose, and a rear section, the other called the front section in the longitudinal direction of the sleeve and located in assembled condition sleeve inside the corrugated hose. The front section of the sleeve consists of a flange covering the free end of the corrugated hose at least partially protruding radially towards ohvachen is th the sleeve of outer space, and grooves located on the perimeter of the sleeve that is open in the longitudinal direction of the sleeve and is intended for at least partial placement of the free end of the corrugated hose. The rear section of the sleeve located in the longitudinal direction is opposite the front section, consists of a set of reeds spring. They are characterized by unloading direction perpendicular to the longitudinal direction of the sleeve and oriented towards the outside of the sleeve.

At least part of the spring tongues provided with at least one radially positioned locking protrusion located on facing the external space of the outer side of the respective spring tongue, to ensure that the current in the longitudinal direction of the lock. In addition, the handpiece according to the invention contains located in the hub of the locking sleeve, which in assembled condition of the tip, when viewed in the longitudinal direction, is located at least partially on the rear section of the sleeve inside covered by the sleeve of the inner space. This retaining sleeve restricts radial clearance reeds spring in the direction towards the inner space of the sleeve.

The design of a tip according to the invention due to the following reasons.

the La protection placed in corrugated hose cables and assembled corrugated hose employee free end of the corrugated hose with sharp edges overlaps the groove of the sleeve. It was found that corrugated profile corrugated hose allows easy fixing of the sleeve on the corrugated hose in the longitudinal direction. To ensure easy installation with no tools were provided by the spring elements of the locking protrusions, the setting in the corrugated profile of the corrugated hose. While pushing the sleeve into the corrugated hose is elastically spaced locking tabs slide on a separate corrugation corrugated profile as long as the sleeve will not take its final position. To ensure a reliable fixation of the tip on the corrugated hose into the sleeve, put the retaining sleeve, which prevents re-attachment provided between the locking tabs and ribbed corrugated hose locking in the reverse lock spring reeds.

The advantage of the handpiece according to the invention is that it simply and completely assembled without the use of additional tools. In addition, the handpiece according to the invention are protected from erroneous tightening with corrugated hose, which significantly simplifies the laying of corrugated hose.

According to the first variant implementation of the locking sleeve is placed in the sleeve, ensuring a precise fit. While retaining sleeve restricts R is Dalny gap reeds spring to the value section of the route, which is less than the radial extension of locking tabs toward the outside of the sleeve. In this regard, the radial elongation of the locking tabs is measured in the area between the facing outer space outer side of the sleeve and the free end of the locking tabs. By limiting the radial gap to a predetermined value the locking protrusion is constantly projecting above the outer surface of the sleeve. Because the outer surface of the sleeve preferably is attached directly to the inner surface of the corrugated hose, the locking tabs will constantly engage with corrugation corrugated hose. Therefore, the tip will be held securely on the corrugated hose.

According to another preferred variant the execution of the locking sleeve is located on the rear section of the sleeve along the facing to the inner space of the sleeve inner side of the sleeve to the front section of the sleeve. In other words, the retaining sleeve is almost completely passes through the sleeve. This measure helps to impart mechanical stability to the sleeve, in particular given the full resistance of the rear portion of the sleeve formed by the many reeds spring, through the inside sleeve of the locking sleeve, resulting in a Gar is ntinued reliable fixation of the spring reeds.

According to another preferred variant implementation to further improve the reliability of the tip retaining sleeve is held in the sleeve without the possibility of bias. It is helpful to lock the sleeve was fixed against displacement in the direction of the rear section, and the displacement in the direction towards the front portion of the sleeve.

The displacement of the locking sleeve toward the rear portion of the sleeve prevents situated on the sleeve stop. This emphasis does not allow too deep to push by mistake retaining sleeve inside the bushing during installation. In this case, the fixation tip would be, if necessary, is no longer ensured and would again remove the tip and possibly re-cut corrugated hose. Therefore, this emphasis makes use of the tip.

It is preferable that the emphasis is made between the ledge located at the rear end of the sleeve in the radial direction towards the inner space of the sleeve, and turned to the rear end of the sleeve free end of the locking sleeve. It is advisable that using this emphasis, along with the retainer sleeve recorded at the same time, the spring tabs.

The proposed tip is to prevent damage to the wound in the corrugated hose cable. Follow the consequently, the tip should not create new hazards for the input cable. For this reason, according to a preferred variant implementation, located in the direction of the internal space of the sleeve protrusion and the inner side of the locking sleeve is made flush. Thus converted to the internal space of the sharp edge can be effectively eliminated, resulting in significantly can be reduced damage inside the corrugated hose cables.

As an alternative or Supplement to the above-mentioned measures, the retaining sleeve is fixed against displacement in the direction of the rear section of the sleeve with the stop made between radially located on a circle with recess at the front end of the rim and the flange on the front free end of the locking sleeve, protruding radially towards the outside. Preferably, the installer can easily ascertain the presence or absence of the specified position. Therefore, a simple visual inspection verifies the proper fit of the locking sleeve. The end of the flange and the end face contour, preferably made flush. Damage to protruding from a tip of cables and installer, after installation tip on the corrugated hose about algae to work with him, can be significantly reduced.

To secure the tip on the free end of the corrugated hose is necessary, according to other variant execution, to exclude not only the sliding of the locking sleeve inside the bushing, but also slippage of the latter with the locking sleeve. For this reason, the retaining sleeve and fixed against displacement in the direction of the front section of the locking sleeve, at least one located on the retaining sleeve spring element extending into the groove on the sleeve. This design allows you to connect the retaining sleeve with sleeve-type "latch". According to another preferred variant of the run located on the locking sleeve, the spring element is characterized by the unloading direction, oriented in the direction of outer space. In this case, existing in the sleeve groove is open towards the interior space. Preferably the spring element is not in the inner retaining space of the sleeve, so that it does not create the risk of injury for those in the corrugated hose cables. According to another variant implementation, for quick installation tip on the free end of the corrugated hose in the sleeve is made located radially in a circle groove. This ensures that the rotation is nutrient-invariant connection between the sleeve and the locking sleeve; this greatly simplifies the mounting of the locking sleeve.

Preferably, the locking lugs are beveled, which takes place from their free ends toward the rear portion of the sleeve. While pushing the sleeve into the end portion of the corrugated hose locking tabs come off of one of the corrugations of the corrugated hose on the adjacent corrugation until then, until it reaches the end position of the tip. With the help of built-in bevels simplified jumping of corrugations when pushing the tip into the corrugated hose; however, its removal is complicated. So before zataskivanija of the locking sleeve into the sleeve, it is already protected from erroneous retrieval.

The set of elements according to the invention consists of a corrugated hose and the above tip. Lengthening of radially arranged locking tabs such tip in the longitudinal direction of the latter is smaller than the free space between adjacent corrugations of the corrugated hose, measured on the inner side of the corrugated hose. In other words, the lengthening of the locking lugs in the longitudinal direction of the arrowhead is aligned with the internal distance between the corrugations of the corrugated hose. Thus corrugated hose and tip are consistent with each other.

This applies to alternative the mu variant of execution of a set of elements, in which the locking projections have dimensions that provide a precise fit in the above-mentioned free space.

According to another variant implementation, the rim of the tip contains radially located on a circle in the direction towards the rear portion of the sleeve outer surface bounding the groove towards the outer space. The dimensions of this outer surface is selected such that the distance between the bottom of the groove and the free end of the outer surface exceeded the distance between adjacent corrugations of the corrugated hose. This design provides an effect in which the free end of the corrugated hose will always be located in the groove contour.

Below the invention is explained in detail with reference to the drawings. They are the same parts denoted by the same reference position. At the same time submitted:

figure 1 is a longitudinal section of the corrugated hose and the handpiece, the half side of which is shown in longitudinal section;

figure 2 - sleeve, half of which is shown in longitudinal section;

figure 3 is a fragment of figure 2;

4 is a top view of the sleeve of figure 2 in the direction IV in figure 2;

5 is a top view of the locking sleeve.

Figure 1 shows the tip 2 is mounted on the free end 4 of the corrugated hose 6. Tip 2 cut to the center of the and M, passing in the longitudinal direction L of the tip 2, shown below in figure 1 half and shown in its upper half in the top view. Tip 2 consists of a sleeve 8 with just planted in her the retaining sleeve 10. On the front section 12 of the sleeve 8 is of flanges 14 forming the groove 16 for accommodating therein the free end 4 of the corrugated hose 6. In the direction of outer space'AN groove 16 is limited to the outer surface 18. The rear portion 20, opposite the front section 12 in the longitudinal direction L of the sleeve 8 and which in assembled condition of the handpiece 2 inside the corrugated hose, the sleeve 8 is composed of many reeds spring 22. These spring tabs 22 are unloading direction, oriented towards the external space'AN sleeve 8. On their facing the external space, AN outer side 24 are radially spaced locking tabs 26. Using locking tabs 26 is achieved by acting in the longitudinal direction L of the locking between one of the corrugations 28 of the corrugated hose 6 and the sleeve 8. Sleeve 8 comprises an internal space IN which the locking sleeve 10 is located essentially along the entire length of the sleeve 8. The locking sleeve 10 is used for such restrictions radial clearance reeds spring 22, in which n is konecnik 2 is firmly held in corrugated hose 6. For this purpose, the locking sleeve 10 adapted to sleeve 8 with the possibility of a precise landing. It limits the radial clearance reeds spring 22 in the direction towards the inner space IN the value section of the route which is less than the radial extension BR (see figure 2) locking tabs 26 in the direction towards the outer space'AN sleeve 8. Radial elongation BR locking protrusions 26 is measured from facing the external space, AN outer side 24 of the spring tongues 22 and the free end of the respective spring tongue 26.

The locking sleeve 10 is held without displacement in the sleeve 8. In principle, it is possible to ensure reliability from offset by planting the retaining sleeve 10 in the sleeve 8 with a friction closure. However, in this embodiment, the locking sleeve 10 is fixed by means located between the sleeve 8 and the retaining sleeve 10 stops, the warning offset in the direction towards the rear portion 20 of the sleeve 8. This stop is located between the radially towards the interior space IN the sleeve 8 ledge 30 and located at the rear portion 20 of the sleeve 8 the free end of the locking sleeve 10. To eliminate any risk of damage in the internal space IN the tip 2 and inside the corrugated hose 6 cables inner side 32 retaining the sleeve 10 is formed with a ledge 30 geometric circuit.

Another emphasis is made between the front end face 34 of the flanges 14 of the groove 36 and located radially in a circle that acts in the direction to the external space'AN flange 38 of the locking sleeve 10. In order on this site handpiece to exclude possible sharp edges of the end face 34 of the rim 14 and the end face of the flange 38 is made flush.

To eliminate along with the sliding of the locking sleeve 10 in the corrugated hose 6 and the slip retaining sleeve 10 of the sleeve 8, the locking sleeve 10 is fixed by means of the spring element 40. This spring element 40 comes in is made on the inner side of the sleeve 8 of the locking groove 42, the open side of the internal space IN. The spring element 42 made in the form of a single whole with the retainer sleeve 10, characterized by the unloading direction, oriented in the direction of outer space AN. The retaining groove 42 has a radial circular arrangement in the sleeve 8 and thus provides a rotation-invariant landing of the locking sleeve 10 within the sleeve 8.

Figure 2 shows only one known of figure 1, the sleeve 8, and in the lower part of the image it shows in longitudinal section, and in the upper part from the top view. Spring tabs 22 are made in the form of a single whole with the sleeve 8 and to ensure its elastic the spine in the radial direction on the transition area between the main body of the respective spring tongue 22 and the sleeve 8 is provided with a constriction 44. Well, you can see the retaining groove 42 located radially in a circle on the inner side of the sleeve 8, which enters the spring element 40 of the locking sleeve 10.

Figure 3 shows in enlarged fragment of figure 2. Here, clearly you can see the groove 16 for accommodating therein the free end 4 of the corrugated hose 6 and the constriction 44 to ensure the elasticity of the spring tongues 22. Radially located on a circle of the outer surface 18 of the rim 14 restricts the groove 16 in the radial direction. Value 52 of the outer surface 18 in the longitudinal direction L, measured between the bottom 48 of the groove 16 and the free end 50 of the outer surface 18 that is selected is larger than the distance 54 (see figure 1) between adjacent corrugations 28 of the corrugated hose 6. This dimension of the outer surface 18 is required so that the free end 4 of the corrugated hose 6 may constantly get in the groove 16 of the sleeve 8.

Figure 4 shows a top view of the sleeve 8 in the direction IV in figure 2. Clearly you can see the groove 16 that is open in the longitudinal direction L perpendicular to the plane of the drawing. The sight of the user falls directly to the bottom 48 of the groove 16. Provided on spring tabs 22 of the locking protrusions 26 are arranged on their outer side 24 toward the periphery, essentially over the entire width of the spring tongues 22.

On Phi is .5 shows a top view known from figure 1, the locking sleeve 10. The spring element 40, the locking of the locking sleeve 10 from sliding out of the sleeve 8, is cut preferably by laser 46 of the material of the locking sleeve 10. Formed after laser cutting ring is deformed in such a way that the spring element is formed with the unloading direction, oriented in a direction not covered by the retaining sleeve 10 of outer space AN.

Tip 2 and the corrugated hose 6 preferably are consistent among themselves or for the corresponding corrugated hose 6 is chosen suitable tip. For example, select the tip 2 with a suitable diameter. In addition, result in compliance with the shape and size of the locking protrusions 26 of the tip 2 with the corrugations of the corrugated hose. For example, the elongation In the locking protrusions 26 in the longitudinal direction L of the sleeve 8 is selected so that it is less than the distance a (see figure 1) between two adjacent corrugations 28 of the corrugated hose 6. Preferably, these both dimensions were agreed among themselves to ensure accurate fit. In addition, to facilitate installation of the sleeve 8 retaining tabs 26 is made with a bevel, starting from the free ends of the locking tabs 26 and facing the rear portion 20 of the sleeve 8. Thanks to this bevel in the establishment of the sleeve 8 in corrugated hose 6 retaining tabs 26 easy the drop for the individual corrugations 28 of the corrugated hose 6, until it reaches the end position of the sleeve 8.

1. Tip (2)intended for putting on the free end (4) corrugated hose (6)containing:
a) nut (8) facing the free end (4) corrugated hose (6) front section (12) and opposite this front section (12) in the longitudinal direction (L) of the sleeve (8) rear section (20), which in assembled condition sleeve (8) is located inside the corrugated hose (6),
A1) front section (12) of the sleeve (8) consists of a rim (14)covering at least partially the free end (4) corrugated hose (6), protruding radially in a direction not covered by the sleeve (8) outer space (AN) and generatrix located on the perimeter of the sleeve (8) is open in the direction (L) of the sleeve (8) of the groove (16) for at least partial placement in her free end (4) corrugated hose (6),
A2) rear section (20) of the sleeve (8) consists of a set of reeds spring (22), with the unloading direction perpendicular to the longitudinal direction (L) of the sleeve (8) and oriented towards the external space (AN) of the sleeve (8), with at least part of the spring tongues (22) contains at its facing the external space (AN) outer side (24), respectively, at least one radially located stopo the hydrated ledge (26) to provide a current in the longitudinal direction (L) sleeve (8) lock,
b) installed in the sleeve (8) of the locking sleeve (10), which in assembled condition of the tip (2) is located at least partially on the rear section (20) in the longitudinal direction (L) of the sleeve (8) covered by the sleeve (8) inner space (IN) and limits the radial clearance reeds spring (22) in the direction towards the inner space (IN) sleeve (8).

2. The handpiece according to claim 1, in which the locking sleeve (10) is located in the sleeve (8) with an exact fit and restricts radial clearance reeds spring (22) in the direction of the internal space (IN) sleeve (8) to the value section of the route which is less than the radial extension (BR) retaining tabs (26) in the direction of outer space (AN) of the sleeve (8).

3. The handpiece according to claim 1 or 2, in which the locking sleeve (10) extends from the rear section (20) of the sleeve (8) facing the internal space (IN) sleeve (8) the inner side to the front section (12) of the sleeve (8).

4. The handpiece according to claim 1 or 2, in which the locking sleeve (10) is held from displacement within the sleeve (8).

5. The handpiece according to claim 4, in which the locking sleeve (10) are fixed against displacement in the direction to the rear section (20) of the sleeve (8) with emphasis on the sleeve (8).

6. The handpiece according to claim 5, in which the emphasis is made between the lip (30), located on the rear end (20) of the sleeve (8) radially towards the inner is prostranstvo (IN) sleeve (8), and facing to the rear end (20) of the sleeve (8) the free end of the locking sleeve (10).

7. The handpiece according to claim 6, in which is located towards the interior space (IN) protrusion (30) and inner side (32) of the locking sleeve (10) is made flush.

8. The handpiece according to any one of pp.5-7, in which the emphasis is made between radial circular groove (36) on the front side (34) of the rim (14) and flange (38) on the front free end of the locking sleeve (10), projecting radially towards the outside (AN).

9. The handpiece of claim 8, in which the end flange and the end face (34) of the rim (14) made flush.

10. The handpiece according to claim 4, in which the locking sleeve (10) are fixed against displacement in the direction of the front section (12) of the sleeve (8) by means of locking at least one located on the locking sleeve (10) of the spring element (40) located on the sleeve (8) of the locking groove (42).

11. The handpiece of claim 10, which is located on the locking sleeve (10) of the spring element (40) has an unloading direction oriented toward the external space (AN), a made in the sleeve (8) of the locking groove (42) is opened from the side of the internal space (IN).

12. Tip in claim 11, in which the retaining groove (42) is located radially in a circle and performed in the sleeve (8).

13. The tip is .1 or 2, in which at least one of the locking protrusions (26) contains a bevel extending from the free end of the stopper protrusion (26) in the direction of the rear section (20) of the sleeve (8).

14. A set of elements containing the corrugated hose (6) and a cap (2) according to any one of claims 1 to 13, in which the elongation (In) radially arranged locking protrusions (26) in the longitudinal direction (L) is less than the free space (A) between adjacent corrugations (28) corrugated hose (6), measured on the inner side (IN) corrugated hose (6).

15. A set of elements containing the corrugated hose (6) and a cap (2) according to any one of claims 1 to 13, in which the locking protrusions (26) configured to their exact landing in free space (A).

16. The set of elements 14 or 15, in which the bevel (14) of the handpiece (2) contains the outer surface (18)that is located radially in a circle in the direction towards the rear portion of the sleeve (8) and bounding the groove (16) in the direction of the external space (AN), and the sizes of the outer surface (18) is selected such that the distance (52) between the bottom (48) of the groove (16) and the free end (50) of the outer surface (18) is greater than the distance (54) between adjacent corrugations of the corrugated hose (6).



 

Same patents:

FIELD: machine building.

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FIELD: the invention refers to the field of the pipeline transport and may be used for electric disconnection of pipelines and/or their sections particularly at protecting them from corrosion.

SUBSTANCE: dielectric insertions are placed between adjacent butt-ends of two sockets fulfilled out of the material of the pipeline and between the sockets and the exterior muff connecting them. The interior surface of the sockets in the zone of location of the muff is provided with ring lugs with the height exceeding the thickness of the dielectric insertions between the sockets and the muff and radial distribution of sockets is carried out as a minimum until elimination of gaps between the sockets and the muff along the entire length of their coupling. The ring lug on the interior surface of the sockets are made by way of fixing of packing rings inside the sockets. As dielectric insertions between the sockets and the muff an exterior plastic covering of the sockets may be used. In case of transporting along the pipeline of electrically conducting fluid the inner surface of current insulating insertion is provided with dielectric covering.

EFFECT: reduces labor-intensiveness of manufacturing.

4 cl, 3 dwg

Insulating coupling // 2271494

FIELD: construction.

SUBSTANCE: insulating coupling comprises thickened branch pipes which are cut in the pipeline over their outer diameters. The inner side of the branch pipes is provided with thin-walled sealing members arranged with a spaced relation to each other. The insulating coupling is mounted in the split coupling. The spaces between the split coupling and branch pipes receive the reinforced dielectric material.

EFFECT: enhanced reliability.

2 cl, 2 dwg

FIELD: pipeline engineering.

SUBSTANCE: electrically insulating fitting comprises two metallic branch pipes and dielectric member which are interconnected through the threaded joint whose inter-thread space is filled with the glue composition. The flexible member is interposed between the face of the dielectric member and face surfaces of branch pipes for permitting control of the load in the thread to provide optimal gluing pressure.

EFFECT: enhanced reliability.

1 dwg

FIELD: pipe joints.

SUBSTANCE: joint comprises male member provided with thread turns that define the pitch of the load-bearing side, pitch of the stabilizing side, and nominal pitch. The female member has thread turns that engage the thread turns on the male member. The turns of the thread on the female member define the pitch of the load-bearing side, pitch of stabilizing side, and nominal pitch. At least one of the pitches of the load-bearing side and pitches of the stabilizing side on, at least, the female member or on the male member changes controllably from the specified distance from the end of the thread turns. The pitch of loading and pitch of stabilizing are different at least over a part of the thread length.

EFFECT: enhanced reliability.

44 cl, 26 dwg

Nondetachable joint // 2292490

FIELD: rocket-space engineering.

SUBSTANCE: nondetachable joint comprises end member made of bushing with shank at its one end and face ring groove at its other end and tubular member made of composition material glued in the groove of the end member. The end member is provided with axial slots from the side of the face ring groove to define pairs of tabs each of which has inner and outer tabs. The pairs of inner and outer tabs are tightened to corresponding surfaces of the tubular member by means the radial fastening members. The bend rigidity in the cross-sections of the inner and outer tabs may be the same. The tubular member may be provided with ends strengthened in radial direction.

EFFECT: enhanced reliability.

2 cl, 3 dwg

FIELD: mechanical engineering.

SUBSTANCE: joint comprises joining member made of a material with the shape memory effect. The end of one of the parts is provided with ring provided with a groove. The end of the other part is provided with the second ring having a projection. The projection is coated with a material with the shape memory effect. The thickness of the coating depends on the deformation to be recovered.

EFFECT: enhanced reliability.

1 cl, 1 dwg

FIELD: engines and pumps.

SUBSTANCE: elongated column assemble contains hollow pumping booms and jointing elements with an axle jointed together between the driving head arranged of the petroleum well surface and rotary pump arranged in the hole bottom. Every boom has, at least, one end with inner thread to mate the jointing element outer thread, e.g. a nipple. To optimise the strain distributions across the structural elements, the threads with various profiles are used, e.g. an asymmetric truncated cone and varying taper thread profiles. The collars to transmit torque have maximum possible mean diameter and cross-section to rule out accumulation of reactive torque in the column. A modified nipple has, preferably, a seal on its free end to reduce the risks of corrosion. A modified boom can have a number of orifices on each its end to increase flow of medium to forced out.

EFFECT: higher shear resistance, lower concentration of strains and lower accumulation of reactive torque.

34 cl, 35 dwg, 1 tbl

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