CN100542750C

CN100542750C - The protective cover of a hand-held abrasive cut-off wheel machine

Info

Publication number: CN100542750C
Application number: CNB2005101185576A
Authority: CN
Inventors: C·维德; M·埃伯哈特; K·-M·尤尔; J·霍尔曼恩; J·埃拉思
Original assignee: Andreas Stihl AG and Co KG
Current assignee: Andreas Stihl AG and Co KG
Priority date: 2004-10-29
Filing date: 2005-10-31
Publication date: 2009-09-23
Anticipated expiration: 2025-10-31
Also published as: DE102005063679B3; DE202005022136U1; CN1765581A

Abstract

The present invention relates to a kind of protective cover (1) of hand-held abrasive cut-off wheel machine.This protective cover (1) has at least two nozzle (3,4) and the conveyance conduits (5) to this nozzle (3,4) of being used for cooling liquid.A duct section (6) of described conveyance conduit (5) passes a bow body (2) that is arranged on protective cover (1) outside and extends from first nozzle (3) to second nozzle (4).

Description

The protective cover of a hand-held abrasive cut-off wheel machine

Technical field

The present invention relates to the protective cover of a hand-held abrasive cut-off wheel machine, this protective cover has at least two nozzle and conveyance conduits that arrive this nozzle of being used for cooling liquid.

Background technology

Hand-held abrasive cut-off wheel machine produces a large amount of cutting dust when cutting in stone or similar material, this dust also may mix up thicker particle.Be provided with a protective cover in order to catch described cutting dust, particle and issuable spark, it hides the pitch cutting of abrasive cut-off wheel machine partly.This angle emery wheel keeps different angle positions according to the cutting task that will carry out with the material that will be cut.In order to adapt to different angle positions, rotatably constitute the corresponding protection cover.Handle on protective cover can be regulated required position of rotation.

A large amount of cutting tasks are preferably undertaken by wet cutting.Make a kind of cooling liquid for example be transported to pitch cutting and cutting part by nozzle with the form of water.Water is used to adhere to dust and cools off pitch cutting.

By the known hand-held abrasive cut-off wheel machine of WO 02/47873 A1, side direction is provided with a nozzle that is used for described cooling liquid respectively in its protective cover.The hoseline of Y shape branch directs into nozzle, and a peripheral wall around protective cover in the wherein said hoseline directs into the nozzle on opposite.Flexible hoseline is difficult in place and fixing.They may produce in heavy cutting task and when adjusting the protective cover angle position and disturb or damage.

Summary of the invention

The objective of the invention is, improve the protective cover of a hand-held abrasive cut-off wheel machine like this, make under wet cutting condition, to obtain an operability easily.

This purpose is achieved by the protective cover of a hand-held abrasive cut-off wheel machine, and this protective cover has at least the first nozzle and second nozzle being used to supply with cooling liquid, and has a conveyance conduit that arrives first nozzle and second nozzle.According to the present invention, a duct section of described conveyance conduit passes a bow body that is arranged on the protective cover outside and extends from first nozzle to second nozzle.

Advise a protective cover, this protective cover has at least two nozzles, and a duct section of wherein said conveyance conduit passes a bow body that is arranged on the protective cover outside and extends from first nozzle to second nozzle.Especially, this bow body is made of handle.Described duct section is fixed on bow body region place and avoids the mechanical influence of outside.When the abrasive cut-off wheel machine is worked and especially when adjusting protective cover by the bow body, the duct section that is disposed neither can produce interference, also can not be in injured danger.

Extend to second nozzle at bow body described in the preferred improvement project from first nozzle, wherein bending in the body in the described duct section complete combination between these two nozzles.Especially these two nozzles are also surrounded together by the bow body.Constitute the construction unit of the combination of a compactness, it is made with the expense of pettiness, and is easy to assembling.The structure of being advised prevents damage well under the condition of the duct section of avoiding exposing, jet element or like.Especially in the possibility of avoiding producing under the situation of projecting part the moulding of splicing in the protective cover profile.The suspension of disturbing when avoiding being created in work.

In a preferred embodiment, described bow body is fixed on the protective cover by nozzle.Especially described bow body is embedded in the perforate of protective cover by a hollow bearing pin form fit this with connecting.The nozzle that is made of screw (Schraubduebel) is in the fixing then precession hollow bearing pin.By hollow bearing pin is sticked in the corresponding aperture of protective cover with for example locating, at least one of generation bow body is temporary fixed thus, so just realizes assembling easily.The nozzle that constitutes by screw by precession make the hollow bearing pin expansion or at least like this acred give birth to and support, make that this hollow bearing pin is reliable and can be fixed in the protective cover perforate with carrying.Described nozzle also is a fixed mechanism simultaneously, reduces processing and assembly fee thus and uses.

In preferred alternative, described nozzle constitutes with the form of the hollow bolt that concurs with an internal thread, by it the bow body is connected with protective cover realization bolt.The external thread rotary of described nozzle enters in the internal thread, and this can realize assembling easily, need not to spend the expense of tapping screw thread.Described internal thread can directly be drawn in the wall body making protective cover.A preferred nut that especially is made of tetragonal nut is furnished with internal thread, and this nut shape is fixed on the protective cover with being connected.Being fixed on when tighting a bolt connection that the form fit of described nut connects only needs swivel nozzle, and nut is fixed anti-rotationly.With the bolt connected load protective cover is made by a kind of lightweight structural material, wherein be selected a kind of corresponding hard and material that can carry for the nut that separates.Described bow body is fixed by a strong bed knife, and can bear strong load.Even in maintenance work for example, repeatedly unclamp and tight a bolt that screw thread also keeps injury-free when being connected.Need not to change parts.

In a kind of preferred embodiment, described two nozzles are arranged in two sides of protective cover opposed to each other, and wherein said bow body encloses peripheral wall of card by the pipeline position of a U-shaped and encloses the sidewall of card protection cover partly.It is wetting that these two opposed nozzles are responsible for equably carrying out both sides for pitch cutting.Fluid between these two nozzles connects by U-shaped pipeline position to be set up.By U-shaped pipeline position, especially be combined in fixing on these two nozzles, between bow body and protective cover, realize being connected of high-mechanic closely.Bow body and protective cover can constitute on corresponding light weight ground under the condition of considering desired operating load.

Described protective cover preferably has a step that roughly radially extends, and the U-shaped pipeline position of bow body leans on this step.This step can be used as assembling auxiliary body and improves the intensity of protective cover simultaneously, and this helps to alleviate its weight.Described U-shaped pipeline position can be close in the step at least partly, makes this pipeline position also outstanding from the side profile of protective cover with littler size thus, less is subjected to externalities thus.

Described bow body has especially radially outward point to, an annular hand grip bow aptly at the peripheral wall place.This handle bow can meet ergonomically to be held well, makes built-in duct section prevent to clash into the position that load or the like ground is bearing in the protective cover peripheral wall simultaneously.

In a preferred improvement project, described bow body is fixed on the peripheral wall of protective cover by U-shaped pipeline position form fit with connecting.Two free ends in conjunction with U-shaped structure and U-shaped pass through the fixing of nozzle, and it is fixing to form 3 of spatially determining, this is fixed on all directions can bear high load capacity.

Described for this reason peripheral wall has a thickening position shaping, radially outstanding aptly, and it is embedded in the groove of a configuration of bending body.Additionally suitable is to be connected on the peripheral wall at thickening position with can making bow body bolt.Described thickening position is connected with the form fit of groove that of causing bending body is accurate, no bent position is fixed, and this fixed-site can additionally connect by bolt and guarantees.Described thickening part potential energy enough holds one and is used for bolted screw thread accordingly, and in its outside protective cover thin-walled ground and light weight ground is constituted.

In a preferred embodiment, described bow body is made of flat tube at the position of the duct section between described two nozzles.Its in the face of the outer surface plane of protective cover lean on protective cover.Described opposed outer surface forms one greater than 90 ° angle [alpha] with respect to the surface of the cross section of flat tube and protective cover.Described planar top on protective cover is by avoiding entering and being detained of dirt, dust or similar substance.At least is near continuous equably from the protective cover surface to the angled transition on flat tube surface, the outside.When the unconscious contact that operation causes, the object in the outside can not damage duct section.

Also advantageously, described nozzle and/or a fittings body especially integrally constitute with the bow body with an adapter that is used for a hoseline.Be that described bow body especially is fixed on the protective cover by the hollow bearing pin form fit with connecting aptly at this.Reduced the quantity of member.For example can realize assembling on the protective cover in simple mode by the bow body is snapped fit onto.

Description of drawings

Describe embodiments of the invention in detail by means of accompanying drawing below.In the accompanying drawing:

Fig. 1 illustrates a hand-held abrasive cut-off wheel machine with a side view, and it has that be made of handle, a bow body on its protective cover and a water inlet pipe that is combined in this bow body,

Fig. 2 illustrates details according to the protective cover of the abrasive cut-off wheel machine of Fig. 1 with enlarged drawing,

Fig. 3 goes out protective cover according to Fig. 1 to amplify partial illustration, and the place has the duct section that is combined in wherein at the bow body region,

Fig. 4 illustrates nozzle according to the input side of Fig. 3 with amplification sectional view,

Fig. 5 illustrates handle part according to the protective cover of Fig. 1 with local longitudinal cross-section, has to be used for form fit and will to bend body with connecting and be fixed on details on the peripheral wall,

Fig. 6 illustrates structure according to Fig. 5 with a cross-sectional view,

Fig. 7 illustrates the details VII according to Fig. 6, have be used for making the bow body in combination form fit connect the details that is fixed on the peripheral position of protective cover with bolt with being connected,

Fig. 8 illustrates protective cover and the nozzle that is made of hollow bolt with the three-dimensional exploded view of part,

Fig. 9 illustrates protective cover according to Fig. 8 with three-dimensional internal view, has the tetragonal nut that form fit is connected and fixed, and is used for bolt and connects nozzle.

The specific embodiment

Fig. 1 illustrates an abrasive cut-off wheel machine with a motor case 23 with a side view, a motor of the internal-combustion engine that is not shown specifically is set as the CD-ROM drive motor that is used for pitch cutting 24 in this shell.Fix a back handle 21 and a front hand grip 22 on motor case 23, they are used for manually guiding the abrasive cut-off wheel machine.Pitch cutting 24 is driven around a rotation 44 by a belt drive unit 25 rotatably by described unshowned CD-ROM drive motor.

Fix a protective cover 1 in a wheel hub position 45 of pitch cutting 24, it covers pitch cutting 24 in side and its peripheral position on an about angular range of 180 °.This protective cover 1 adjustable ground is fixed, and can swing in the desired operating position around wheel hub position 45 or around rotation 44 on the direction of a double-head arrow 46 when needed.In order to regulate position of rotation, on protective cover 1, fix the bow body 2 of a handle form, can apply by it and be used to regulate required hand active force.

A nozzle 3 that is used for cooling liquid is set on a sidewall 10 of protective cover 1.Another unshowned here nozzle 4 be arranged on the opposite, in the view of Fig. 1 on the sightless sidewall 11, and to be discussed in more detail below.A conveyance conduit 5 is furnished with a hose coupling 26 and directs into nozzle 3 at input.From first nozzle 3, a duct section 6 of described conveyance conduit 5 passes bow body 2 and directs into second nozzle 4 (Fig. 3).This bow body 2 can not have handle function ground to constitute yet.For example the water as cooling liquid can be transported to

nozzle

3,4 by conveyance conduit, and be transported to pitch cutting 24 as cooling agent and the bond that is used for dust therefrom.

Described bow body 2 is fixed on the protective cover 1 by nozzle 3 and the nozzle 4 on the opposite shown in Fig. 3.This bow body 2 also has the section of reclining 27 on a plane on the periphery of protective cover 1, make bow body 2 lean position at a peripheral wall 13 of protective cover 1 by it.By the section of reclining 27 bow body 2 is supported on a direction of rotation of representing by an arrow 29 around nozzle 3,4.In order to be bearing on the rightabout by arrow 28 expressions, be provided with the fixture that a form fit of describing in detail in conjunction with Fig. 5 to 7 connects, it is guaranteed by a bolt 30.

Fig. 2 illustrates the protective cover 1 as individual components according to Fig. 1 with an enlarged drawing, and this protective cover 1 is symmetrical in center line 31 ground formation in view of the above.Described peripheral wall 13 has 14, one bolts hole 32 in a thickening position of radially outward stretching out symmetrically respectively for center line 31 and crosses this thickening position respectively in both sides.This thickening position 14 integrally is formed on the peripheral wall 13.Also be formed separately a step 17 that substantially radially extends in center line 31 both sides, on two

sidewalls

10,11.

Fig. 3 illustrates according to the protective cover 1 of a Fig. 1 partial cross section at bow body 2 places with the cross-sectional view of an amplification.Described two

nozzles

3,4 symmetrical ground are arranged on these two

sides

10,11 of protective cover 1 over the ground.Described bow body 2 has a U-shaped pipeline position 12, by it make described bow body 2 along a side 10 around peripheral wall 1 and along the another side 11 the guiding.These two

nozzles

3,4 are arranged on the free side leg at U-shaped pipeline position, and are combined in the pipeline position 12.

Described duct section 6 extends to second nozzle 4 from first nozzle 3, and in this case complete combination the bow body 2 U-shaped pipeline position 12 in.Make bow body 2 between first nozzle 3 at sidewall 10 places and second nozzle 4 on the opposite side wall 11, set up the bindiny mechanism of the liquid of a water conservancy diversion thus.The duct section 6 of described conveyance conduit 5 this corresponding to the shape at U-shaped pipeline position 12 ground on

side

10,11 along and around peripheral wall 13 guidings.6 of duct sections are extended by bow body 2 partly.

Described bow body 2 is made by plastic components, and for the duct section 6 that forms combination to press (GID) processes in the gas.Radially in peripheral wall 13 outsides, on bow body 2, integrally form a handle that outwards point to, annular and bend 16.On the free side leg at U-shaped pipeline position, integrally form a hollow bearing pin 7 that inwardly points to respectively, bow body 2 form fit are clamped in two opposed perforates 8 of protective cover 1 with connecting by it.Described two hollow bearing pins 7 hold

nozzle

3,4, and they are aligned inwards pitch cutting 24.The U-shaped pipeline position 12 of described bow body 2 leans in confined state on the step 17 (Fig. 2) that radially extends in the side of protective cover 1.

Shown in Figure 4 in Fig. 3 the amplification details of nozzle 3 position structures.Described in the embodiment shown nozzle 3 is made of screw 9, and has a tapping screw thread 40 at it in the face of on the end of pitch cutting 24 (Fig. 3).Described screw 9 screw in the hollow bearing pin 7 by tapping screw thread 40, and the free end at the U-shaped pipeline position 12 of bow body 2 is fixed on the protective cover 1.Described screw thread 40 makes hollow bearing pin 7 radially outward expand this, and its is fixed in the perforate 8 with clamping.One or two

nozzle

3,4 and bow body 2 are integrally constituted.This bow body 2 especially can be fixed on the protective cover 1 by hollow bearing pin 7 form fit that are shaped at this with connecting, for example is positioned at by location hook or the like in the corresponding perforate 8 at hollow bearing pin 7 described in this bow body.

Described nozzle 3 has a termination 42 in the outside, it has an interior hexagonal 39, can make nozzle 3 precessions by hexagonal in this.Between the free end at termination 42 and pipeline position 12, clamp a fittings body 33, form one thereon and take over 34.Taking over a part of plugging the conveyance conduit 5 of flexible pipe 35 forms on 34, and fixing by a hose band 47.Described termination 42 plane earths and lean hermetically one of fittings body 33 around ring projection 41 on.This fittings body 33 and adapter 34 can integrally constitute with bow body 2.

Described nozzle 3 has a columniform interlude 48, and it surrounds by a ring casing 38 at the free-ended position at fittings body 33 and pipeline position 12.This nozzle 3 is furnished with a cross-drilled hole 36 that is passed in the ring casing 38 at the position of interlude 48.This cross-drilled hole 36 is connected with a slotted hole 37.By means of ring casing 38 and

hole

36,37 constitute one from flexible pipe 35 by the water conservancy diversion bindiny mechanism of nozzle 3 towards protective cover 1 inside.Described ring casing 38 also is in being connected of water conservancy diversion with the duct section 6 that is constituted in pipeline position 12, provide the water conservancy diversion bindiny mechanism (Fig. 3) of the nozzle 4 from conveyance conduit 5 to the opposite thus.Described nozzle 4 interposed structure is as one man constituted with nozzle 3 structures shown here on meaning except fittings body 33 at least.

Fig. 5 illustrates according to the structure of a Fig. 3 longitdinal cross-section diagram at the position of handle bow 16.The section of reclining 27 of described bow body 2 is furnished with a recessed groove 15, and the thickening position 14 of the peripheral wall 13 of protective cover 1 evenly is embedded in this groove.Described thickening position 14 and correspondingly configured groove 15 are furnished with a side 43, design its angle position size like this, make that relating to direction of rotation 28 between bow body 2 and peripheral wall 13 provides the connection that a form fit is connected.In order additionally to connect at this position, be provided with a bolt connecting device, one of them bolt 30 passes thickening position 14.

It can also be seen that from view described pipeline position 12 is radially protected by handle bow 16 with respect to peripheral wall 13 in the outside together with the duct section 6 of flat formation on cross section according to Fig. 5.

Fig. 6 illustrates the cross-sectional view according to the structure with side leg that U-shaped pipeline position 12 tilts to cut off of Fig. 5.Side leg position at the pipeline position, the pipeline position 12 of bow body 2 is made of flat tube 18, and its cross section has the turning of two acute angles.Between the turning of these two acute angles, extend flat outer surface 19,20.In the face of the outer surface 19 of protective cover 1 respectively up to the turning of acute angle ground level lean on the

sidewall

10,11 at protective cover 1.The outer surface 20 of the outside sensing on opposite with the intermediate location of the

sidewall

10,11 of adjacency in shape surperficial with it at an angle alpha, it is in the embodiment shown obviously greater than 90 °.

Details VII according to Fig. 6 is shown in Fig. 7 enlargedly.Described in view of the above thickening position 14 on the peripheral wall 13 of protective cover 1 in cross section essentially rectangular ground constitute, and surrounded by the groove 15 of the same shaping of bow body 2.Bolt 30 passes transverse to the thickening position, makes pipeline position 12 produce a fixing fixed position in space on all directions on the peripheral wall 13 thus.

Fig. 8 illustrates three-dimensional exploded view according to another embodiment of protective cover 1 of the present invention with the form of local figure, and described bow body 2 fork-shaped ground are plugged on the protective cover by its pipeline position 12.For fixing, be provided with bolt 30 and described two nozzles of arranging in the axial direction 3,4.Described

nozzle

3,4 passes perforate 8 and inserts thoroughly from outside to inside, wherein fittings body 33 of middle arrangement in nozzle 3.

Nozzle

3,4 is made of the

hollow bolt

49,50 that has an external screw thread 55 respectively on the end, and this end is arranged in the inner room 54 of protective cover 1.Realize that by nut 52 bolt of described two

nozzles

3,4 connects in the inner room 54 of protective cover 1, this nut is made of tetragonal nut in the embodiment shown.Described nut 52 has the external screw thread 55 that an internal thread 51 is used to hold

hollow bolt

49,50 respectively.Also can make internal thread 51 for example in the

sidewall

10,11 of protective cover 1, be positioned at the position of perforate 8 aptly.Said internal thread 51 can be directly in the material of protective cover 1 cutting come out, perhaps as the screw thread part splicing of packing into.

Fig. 9 illustrates according to the protective cover 1 of Fig. 8 and the three-dimensional internal view of belt drive unit 25 parts.Described belt drive unit 25 comprises a belt pulley 59 with a driving shaft 60, and a wheel hub 61 that is used to be contained in the abrasive cut-off wheel 24 shown in Fig. 1 is set on driving shaft.This wheel hub 61 encloses with the protected roughly half ofly diametrically cover 1 of unshowned abrasive cut-off wheel 24 here and blocks, and wherein said abrasive cut-off wheel 24 (Fig. 1) moves in the inner room 54 of protective cover 1 rotatably.

Extend the conveyance conduit 5 of a flexible pipe form from hose coupling 26, and be passed in the nozzle 3 by means of fittings body 33.A part of liquid stream of cooling agent is directed to the nozzle 4 on opposite by the pipeline position 12 of bow body 2 in conveyance conduit 5 therefrom.By these two

nozzles

3,4 make refrigerant injection in inner room 54 running abrasive cut-off wheel 24 on (Fig. 1).Described nut 52 inner room 54 midplanes lean on

sidewall

10,11, and fix by lath 58 such form fit of radially extending, integrally be formed on protective cover 1

sidewall

10,11 with connecting, make them prevent to rotate.Described lath 58 also can be shaped towards nut 52 towards inside on clamp shape ground.In order to assemble, nut 52 is radially pushed and in pushing state in the axial direction and prevent rotatably fixing or clamping.The

nozzle

3,4 that is made of

hollow bolt

49,50 passes the side leg of bow body 2 and the

sidewall

10,11 of protective cover 1 from outside to inside, and by in the internal thread 51 (Fig. 8) of external screw thread 55 precession nuts 52.

Nozzle

3,4 is connected with protective cover 1 bolt at its side leg position with bow body 2.Tetragonal nut shown in the replacement also can constitute nut 52 by the thread plate that hex nut or other form are shaped.

Claims

1. the protective cover of a hand-held abrasive cut-off wheel machine, this protective cover have at least the first nozzle (3) and second nozzle (4) being used to supply with cooling liquid, and a conveyance conduit (5) that arrives described first nozzle (3) and second nozzle (4),

It is characterized in that a duct section (6) of described conveyance conduit (5) passes a bow body (2) that is arranged on protective cover (1) outside (4) and extends from first nozzle (3) to second nozzle.

2. protective cover as claimed in claim 1 is characterized in that, described bow body (2) is made of handle.

3. protective cover as claimed in claim 1 or 2 is characterized in that, described bow body (2) extends to second nozzle (4) from first nozzle (3), and wherein said duct section (6) complete combination is in bow body (2).

4. protective cover as claimed in claim 3 is characterized in that, described first nozzle (3) and second nozzle (4) are bent body (2) and surround together.

5. protective cover as claimed in claim 4 is characterized in that, described bow body (2) is fixed on the protective cover (1) by first nozzle (3) and second nozzle (4).

6. protective cover as claimed in claim 5; it is characterized in that; described bow body (2) is embedded in the perforate (8) of protective cover (1) by hollow bearing pin (7) form fit with connecting; and described first nozzle (3) and second nozzle (4) constitute by screw (9), in the hollow bearing pin (7) of described screw difference precession correspondence.

7. protective cover as claimed in claim 5; it is characterized in that; described first nozzle (3) and second nozzle (4) are respectively with a hollow bolt (49 that concurs with an internal thread (51); 50) form constitutes, and makes bow body (2) carry out bolt with protective cover (1) by described hollow bolt and is connected.

8. protective cover as claimed in claim 7 is characterized in that, a nut (52) is furnished with internal thread (51), and its form fit is fixed on the protective cover (1) with connecting.

9. protective cover as claimed in claim 1; it is characterized in that; described first nozzle (3) and second nozzle (4) are arranged on two sidewalls (10 of protective cover (1) Face to face; 11) in; wherein said bow body (2) encloses a peripheral wall of card (13) by the pipeline position (12) of a U-shaped; and enclose the sidewall (10,11) of card protection cover (1) partly.

10. protective cover as claimed in claim 9 is characterized in that, described bow body (2) has an annular hand grip bow (16) at the position of peripheral wall (13).

11., it is characterized in that described protective cover (1) has a step (17) that radially extends as claim 9 or 10 described protective covers, the U-shaped pipeline position (12) of bow body (2) leans on this step.

12. protective cover as claimed in claim 9 is characterized in that, described bow body (2) is fixed on the peripheral wall (13) by U-shaped pipeline position (12) form fit with connecting.

13. protective cover as claimed in claim 12 is characterized in that, described peripheral wall (13) has thickening position (a 14) shaping, radially outstanding, and this thickening position is embedded in the corresponding groove (15) that disposes of bow body (2).

14. protective cover as claimed in claim 13 is characterized in that, described bow body (2) is connected on the thickening position (14) with peripheral wall (13) with screwing.

15. protective cover as claimed in claim 1; it is characterized in that; described bow body (2) is made of flat tube (18) at the position of duct section (6); described flat tube (18) in the face of outer surface (19) plane earth of protective cover (1) leans on protective cover (1), and the outer surface (20) of the flat tube (18) relative with the outer surface (19) in the face of protective cover (1) of described flat tube (18) is with respect to one of the surface formation of the cross section of flat tube (18) and protective cover (1) angle [alpha] greater than 90 °.

16. protective cover as claimed in claim 1 is characterized in that, at least one in described first nozzle (3) and second nozzle (4) integrally constitutes with bow body (2).

17. protective cover as claimed in claim 16 is characterized in that, described bow body (2) form fit is fixed on the protective cover (1) with connecting.

18. protective cover as claimed in claim 1 is characterized in that, is provided with the fittings body (33) that is used to connect described conveyance conduit (5), described fittings body (33) integrally constitutes with bow body (2).

19. protective cover as claimed in claim 8 is characterized in that, described nut (52) is made of tetragonal nut.

20. protective cover as claimed in claim 10 is characterized in that, described annular hand grip bow (16) points to radially outwardly.

21. protective cover as claimed in claim 17 is characterized in that, described bow body (2) is fixed on the protective cover (1) by hollow bearing pin (7) form fit with connecting.

22. protective cover as claimed in claim 18 is characterized in that, described fittings body (33) is provided with adapter (34), and described fittings body (33) integrally constitutes with described bow body (2) with taking over (34).