WO2016142586A1 - Flexible torsion shaft, arrangement and device for cleaning air-conditioning ducts - Google Patents

Flexible torsion shaft, arrangement and device for cleaning air-conditioning ducts Download PDF

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Publication number
WO2016142586A1
WO2016142586A1 PCT/FI2016/050146 FI2016050146W WO2016142586A1 WO 2016142586 A1 WO2016142586 A1 WO 2016142586A1 FI 2016050146 W FI2016050146 W FI 2016050146W WO 2016142586 A1 WO2016142586 A1 WO 2016142586A1
Authority
WO
WIPO (PCT)
Prior art keywords
torsion shaft
flexible torsion
flexible
shaft
fibre
Prior art date
Application number
PCT/FI2016/050146
Other languages
French (fr)
Inventor
Pentti HILTUNEN
Original Assignee
Bierkühl Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bierkühl Oy filed Critical Bierkühl Oy
Priority to EP16761149.0A priority Critical patent/EP3268139A4/en
Publication of WO2016142586A1 publication Critical patent/WO2016142586A1/en
Priority to US15/698,371 priority patent/US10736412B2/en

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Classifications

    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B13/00—Brushes with driven brush bodies or carriers
    • A46B13/02—Brushes with driven brush bodies or carriers power-driven carriers
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B5/00—Brush bodies; Handles integral with brushware
    • A46B5/002—Brush bodies; Handles integral with brushware having articulations, joints or flexible portions
    • A46B5/0033—Brush bodies; Handles integral with brushware having articulations, joints or flexible portions bending or stretching or collapsing
    • A46B5/0037—Flexible resilience by plastic deformation of the material
    • B08B1/32—
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
    • B08B9/027—Cleaning the internal surfaces; Removal of blockages
    • B08B9/04—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes
    • B08B9/043—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved by externally powered mechanical linkage, e.g. pushed or drawn through the pipes
    • B08B9/045—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved by externally powered mechanical linkage, e.g. pushed or drawn through the pipes the cleaning devices being rotated while moved, e.g. flexible rotating shaft or "snake"
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C1/00—Flexible shafts; Mechanical means for transmitting movement in a flexible sheathing
    • F16C1/02—Flexible shafts; Mechanical means for transmitting movement in a flexible sheathing for conveying rotary movements
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B2200/00—Brushes characterized by their functions, uses or applications
    • A46B2200/30—Brushes for cleaning or polishing
    • A46B2200/3013—Brushes for cleaning the inside or the outside of tubes

Definitions

  • the present invention relates to a flexible torsion shaft defined in the preamble to Claim 1, as well as an arrangement using a casing tube.
  • a cleaning device for air-conditioning ducts is one particular embodiment.
  • the flexible shaft according to the invention is suitable for transmitting a torsion force in many applications, particularly when used inside a casing tube.
  • an air-conditioning cleaning device is disclosed, which is known from, among others, Finnish patents 94221 and 108408 and from utility model 9567.
  • a flexible shaft is used to rotate a cleaning brush.
  • the brush device used in the solution comprises a motor-driven brush, which is supported on the wall of the duct with the aid of a carrier brush.
  • the flexible operating arm comprises a casing tube and a braided steel cable fitted inside it.
  • the flexible shaft is rigidly attached from the casing tube to the body of the drive motor.
  • the drive shaft is rigidly joined to the shaft of the motor, so that torque is efficiently transmitted in the long, flexible shaft to the brush head.
  • the brush head is operated in both directions.
  • Such a steel cable is wound to either the right or the left. Due to this, its t o r que - 1 r an smi 11 ing capability is not symmetrical.
  • a second drawback with this known solution is that the steel cable is heavy, the total weight of the reel rising to as many as several tens of kilogrammes.
  • the present invention is intended to eliminate the said drawbacks and create an improved device for cleaning air- conditioning ducts.
  • the torsion shaft according to the invention is characterized by what is stated in the characterizing portion of Claim 1.
  • the characterizing features of the arrangement comprising a casing tube are stated in Claim 10 and the particular arrangement for cleaning air-conditioning ducts is in Claim 12.
  • the advantage of the solution according to the invention is that the cross-braided composite cable has symmetrical torque properties. It is also lighter than a steel cable. Due to these advantages, the torsion shaft, and through it the entire cleaning device is more user-friendly.
  • the body of the torsion shaft is preferably epoxy and the reinforcing fibres are mainly glass fibre. Polyamide (Nylon®), aramid (Kevlar®) , UHMWPE (Dyneema®) , and carbon fibre are also suitable for this purpose.
  • the flexible torsion shaft is preferably manufactured by means of pultrusion, in which filament fibres are wound around a preform. Some type of standard filament winder machine can be used.
  • the fibres to be wound around the core wire are soaked in resin and a layer of a chosen thickness is hardened in an oven.
  • the machine winds each layer in two directions, so that by pulling backwards and forwards the winding angles are in opposite directions and the torsion shaft naturally gains symmetrical properties.
  • the outer layers are wound at a steeper angle relative to the core wire.
  • the weight of the fibres is 50 - 75 % of the total weight.
  • the casing tube is preferably of polyamide, when the material hardness and other properties will minimize friction.
  • the diameter of the flexible torsion shaft is 2 - 16 mm, preferably 6 - 12 mm.
  • the diameter of the core (wire, cable, or braided cord or rubber, e.g. EPDM) is arranged in such a way that the total thickness of the casing layer is at most 5 mm, preferably at most 3.5 mm.
  • the minimum radius of curvature of the flexible torsion shaft (12) should be 30 - 200 cm, preferably 50 - 100 cm. In other uses, such as in a drill's flexible torsion shaft, the flexibility can remain substantially smaller.
  • Figure 1 shows a schematic side view of the construction of the flexible shaft
  • Figure 2 shows an axonometric view of the shaft of Figure 1
  • Figure 3 shows a cross-section of the shaft of Figure 1
  • FIG. 4 shows a drill/screwdriver equipped with the flexible shaft
  • Figure 5 shows the construction of the multi-layer torsion shaft in partial cross-section
  • Figure 6 shows a cross-section of the shaft of Figure 5
  • Figure 7 shows one brush cleaning device.
  • the components of the flexible shaft arrangement 10 are a casing tube 14 and the torsion shaft 12 itself.
  • the length of the shaft arrangement can be 2 - 40 m and the diameter of the torsion shaft 12 2 - 16 mm.
  • the casing tube 14 is typically of polyamide and its task is to protect structures by keeping the rotating torsion shaft 12 away from, e.g. the duct structures.
  • Polyamide gives a low coefficient of friction with most of the polymers binding the reinforcing fibres, such as epoxy.
  • the body of the torsion shaft 12 of Figure 1 is epoxy and filament wires 20, generally of glass fibre, are wound on top of it in two directions.
  • the core is a bunch of fibres 18 and a polyethylene membrane 11 is on top of it.
  • the winding angle of the filament wires 20 is crucial.
  • the winding angle is in the order of 75°. Preferably it is 60 - 85°.
  • a low winding angle makes the torsion shaft stiff, so that the curvature radius remains large.
  • a large winding angle gives good torsional stiffness.
  • Several layers can be wound at different winding angles, in order to achieve the desired strength and stiffness properties. The main rule is that the outermost layers are always wound at a steeper angle relative to the core wire.
  • the weight of the fibres is 50 - 70 % of the total weight.
  • the axial filaments 18, which are important to the tensile strength of the shaft, are marked in the figures.
  • the diameter of the flexible torsion shaft is 2 - 16 mm, preferably 6 - 12 mm.
  • the length of such shafts is in the range 2 - 40 m.
  • the nominal torque M is in the range 2 - 30 Nm and the torsional shaft's diameter D is then in the range
  • the core i.e. the core wire
  • the core wire is a nylon cord, on top of which epoxy is cast and glass-fibre filaments are wound on the surface. It is important to isolate the fibre bunch, fabric cord, or braided rubber twine used as the core, from the winding fibre so that the epoxy is not absorbed in the core. Either absorption with oil, or a suitable membrane such as polyethylene can be used, for this isolation.
  • a more highly-developed embodiment than the above uses multi ⁇ layer reinforcing fibre winding and at least two different polymer layers, of which the inner one is hard and the outer one of a more elastic polymer. One such polymer pair is Axson tech.
  • EPOLAM 2040 hard epoxy
  • EPOLAM 8064R flexible epoxy
  • a layer thickness of less than 2 mm does not require a second polymer.
  • the thickness of the casing layer is usually at most 5 mm, preferably at most 3.5 mm.
  • a layer thickness of more than 3.5 mm is generally of no benefit, because then the torsion shaft loses its elasticity.
  • polyurethane can be used, the elasticity of which is many times that of the elastic epoxy referred to above.
  • the same manufacturer's polyurethane resins are 'RE11550 polyol' and 'RE1020- isocyanate', a mixture of which has an elongation value of 230 %.
  • hybrid resins are available, in which different grades of resin, such as epoxy and urethane resins, are arranged together.
  • the task of the core component is to prevent buckling in the casing component when bending the torsion shaft into a curve .
  • the embodiment of Figure 4 does not require a shaft that is as flexible as that above.
  • a relatively rigid shaft is suitable for many purposes.
  • the casing tube can be held by hand, or the body of the device being driven can hold it in place.
  • the said winding angle can then be 45°, generally 40° - 60°.
  • the diameter of drill shafts can be 2 - 8 mm.
  • shafts with a diameter of 2 - 4 mm are suitable for opening drainpipes .
  • the core is a flexible, braided cord, by means of which the internal diameter of the polymer layer is increased in step with the external diameter.
  • the rubber core cord 18' (braided) has a diameter of 2 mm.
  • a thin (0.1 mm) polyethylene membrane 11 On top of it is a thin (0.1 mm) polyethylene membrane 11 to prevent the absorption of epoxy resin.
  • a layer 16" of reinforcing- fibre comes into an elastic epoxy layer 17' (thickness 1.5 mm) at an increasingly steep angle (75°), until the last layer 16"' of 3-mm flat wire is hoop wound at about 78°.
  • About 14 reinforcing-fibre layers are made with 0.2-mm wire (roving), by which a thickness of about 3 mm is achieved together with the epoxy resin.
  • Reinforcing fibres glass-fibre, polyamide (Nylon®), aramid (Kevlar®) , UHMWPE (Dyneema®) , carbon fibre. Rovings to be used 100 - 600 Tex (glass-fibre bunches) , in a circular fibre bunch, thickness 0.1 - 1 mm.
  • a particular application of the flexible torsion shaft is brushing cleaning devices for air-conditioning ducts, of which an example is the device according to utility model FI-U-9567, shown in Figure 7.
  • the flexible torsion shaft according to the invention is suitable for nearly all machines designed for a corresponding task, in which the flexible torsion shaft together with the casing tube can be reeled onto a reel of a quite small diameter (60 - 120 cm) .
  • a disc 34 is set to be rotated with the aid of a shaft 35.
  • pins 34.1 On the circumference of the disc 34 are pins 34.1, between which the flexible torsion shaft 10 with a casing tube is reeled.
  • the brush device 31 is attached to the flexible shaft in the hub 32.
  • the start of the casing tube 14 is permanently attached to the body of the motor assembly 33 and the torsion shaft 12 itself is attached to a rotating toothed-belt gearwheel 33.2. The rotating force generally comes through the shaft, but the construction of the rotation device is not within the scope of the present invention.

Abstract

The invention relates to a flexible torsion shaft (12), which is intended to be attached to a drive shaft, characterized in that the flexible torsion shaft (12) is composite comprising a polymeric base substance (17, 17') and a multi-layer (16, 16", 16"') reinforcing-fibre reinforcement wound at an angle of 45° - 85°, preferably an angle of 60° - 80°.

Description

FLEXIBLE TORSION SHAFT AND AN ARRANGEMENT USING IT
The present invention relates to a flexible torsion shaft defined in the preamble to Claim 1, as well as an arrangement using a casing tube. A cleaning device for air-conditioning ducts is one particular embodiment.
The flexible shaft according to the invention is suitable for transmitting a torsion force in many applications, particularly when used inside a casing tube. In this case, particularly an air-conditioning cleaning device is disclosed, which is known from, among others, Finnish patents 94221 and 108408 and from utility model 9567. In the device for cleaning air-conditioning ducts, a flexible shaft is used to rotate a cleaning brush. The brush device used in the solution comprises a motor-driven brush, which is supported on the wall of the duct with the aid of a carrier brush. The flexible operating arm comprises a casing tube and a braided steel cable fitted inside it. The flexible shaft is rigidly attached from the casing tube to the body of the drive motor. The drive shaft is rigidly joined to the shaft of the motor, so that torque is efficiently transmitted in the long, flexible shaft to the brush head. During cleaning, the brush head is operated in both directions. Such a steel cable is wound to either the right or the left. Due to this, its t o r que - 1 r an smi 11 ing capability is not symmetrical. A second drawback with this known solution is that the steel cable is heavy, the total weight of the reel rising to as many as several tens of kilogrammes.
The present invention is intended to eliminate the said drawbacks and create an improved device for cleaning air- conditioning ducts. The torsion shaft according to the invention is characterized by what is stated in the characterizing portion of Claim 1. The characterizing features of the arrangement comprising a casing tube are stated in Claim 10 and the particular arrangement for cleaning air-conditioning ducts is in Claim 12.
The advantage of the solution according to the invention is that the cross-braided composite cable has symmetrical torque properties. It is also lighter than a steel cable. Due to these advantages, the torsion shaft, and through it the entire cleaning device is more user-friendly. The body of the torsion shaft is preferably epoxy and the reinforcing fibres are mainly glass fibre. Polyamide (Nylon®), aramid (Kevlar®) , UHMWPE (Dyneema®) , and carbon fibre are also suitable for this purpose. The flexible torsion shaft is preferably manufactured by means of pultrusion, in which filament fibres are wound around a preform. Some type of standard filament winder machine can be used. The fibres to be wound around the core wire are soaked in resin and a layer of a chosen thickness is hardened in an oven. The machine winds each layer in two directions, so that by pulling backwards and forwards the winding angles are in opposite directions and the torsion shaft naturally gains symmetrical properties.
According to the invention, several layers are wound around a core wire, preferably at different winding angles, in order to achieve the desired strength and stiffness properties. The main rule is that the outer layers are wound at a steeper angle relative to the core wire. The weight of the fibres is 50 - 75 % of the total weight. The casing tube is preferably of polyamide, when the material hardness and other properties will minimize friction.
The diameter of the flexible torsion shaft is 2 - 16 mm, preferably 6 - 12 mm. The diameter of the core (wire, cable, or braided cord or rubber, e.g. EPDM) is arranged in such a way that the total thickness of the casing layer is at most 5 mm, preferably at most 3.5 mm.
In brush cleaning devices, the minimum radius of curvature of the flexible torsion shaft (12) should be 30 - 200 cm, preferably 50 - 100 cm. In other uses, such as in a drill's flexible torsion shaft, the flexibility can remain substantially smaller.
In the following, the invention is described in greater detail with the aid of an embodiment example with reference to the accompanying drawings, in which
Figure 1 shows a schematic side view of the construction of the flexible shaft
Figure 2 shows an axonometric view of the shaft of Figure 1
Figure 3 shows a cross-section of the shaft of Figure 1
Figure 4 shows a drill/screwdriver equipped with the flexible shaft
Figure 5 shows the construction of the multi-layer torsion shaft in partial cross-section
Figure 6 shows a cross-section of the shaft of Figure 5
Figure 7 shows one brush cleaning device.
The components of the flexible shaft arrangement 10 are a casing tube 14 and the torsion shaft 12 itself. The length of the shaft arrangement can be 2 - 40 m and the diameter of the torsion shaft 12 2 - 16 mm.
The casing tube 14 is typically of polyamide and its task is to protect structures by keeping the rotating torsion shaft 12 away from, e.g. the duct structures. Polyamide gives a low coefficient of friction with most of the polymers binding the reinforcing fibres, such as epoxy. The body of the torsion shaft 12 of Figure 1 is epoxy and filament wires 20, generally of glass fibre, are wound on top of it in two directions. The core is a bunch of fibres 18 and a polyethylene membrane 11 is on top of it.
In terms of torsional stiffness, the winding angle of the filament wires 20 is crucial. In the figures, the winding angle is in the order of 75°. Preferably it is 60 - 85°. A low winding angle makes the torsion shaft stiff, so that the curvature radius remains large. A large winding angle gives good torsional stiffness. Several layers can be wound at different winding angles, in order to achieve the desired strength and stiffness properties. The main rule is that the outermost layers are always wound at a steeper angle relative to the core wire. The weight of the fibres is 50 - 70 % of the total weight.
The axial filaments 18, which are important to the tensile strength of the shaft, are marked in the figures.
The diameter of the flexible torsion shaft is 2 - 16 mm, preferably 6 - 12 mm. The length of such shafts is in the range 2 - 40 m. The nominal torque M is in the range 2 - 30 Nm and the torsional shaft's diameter D is then in the range
D = 2.2 mm x 7(M/Nm) +30%
Typical values:
Length 2 m, diameter 3 mm, nominal torque 2 Nm
Length 30 m, diameter 8 - 12 mm, nominal torque 10 - 30 Nm. It is important to adjust the material hardness of the casing tube, because it determined the magnitude of the friction.
In one embodiment, the core, i.e. the core wire, is a nylon cord, on top of which epoxy is cast and glass-fibre filaments are wound on the surface. It is important to isolate the fibre bunch, fabric cord, or braided rubber twine used as the core, from the winding fibre so that the epoxy is not absorbed in the core. Either absorption with oil, or a suitable membrane such as polyethylene can be used, for this isolation. A more highly-developed embodiment than the above uses multi¬ layer reinforcing fibre winding and at least two different polymer layers, of which the inner one is hard and the outer one of a more elastic polymer. One such polymer pair is Axson tech. (FR) EPOLAM 2040 (hard epoxy) and EPOLAM 8064R (flexible epoxy) . Generally, a layer thickness of less than 2 mm does not require a second polymer. The thickness of the casing layer is usually at most 5 mm, preferably at most 3.5 mm. Experience has shown that a layer thickness of more than 3.5 mm is generally of no benefit, because then the torsion shaft loses its elasticity. In the surface layer, polyurethane can be used, the elasticity of which is many times that of the elastic epoxy referred to above. The same manufacturer's polyurethane resins are 'RE11550 polyol' and 'RE1020- isocyanate', a mixture of which has an elongation value of 230 %. In addition to these, hybrid resins are available, in which different grades of resin, such as epoxy and urethane resins, are arranged together. The task of the core component is to prevent buckling in the casing component when bending the torsion shaft into a curve .
In Figure 4, a flexible shaft 30 about a metre in length, fitted into a casing tube, which is used to drive a cleaning brush or other tool, is attached to a drill 28. The embodiment of Figure 4 does not require a shaft that is as flexible as that above. A relatively rigid shaft is suitable for many purposes. The casing tube can be held by hand, or the body of the device being driven can hold it in place. The said winding angle can then be 45°, generally 40° - 60°. The diameter of drill shafts can be 2 - 8 mm. For example, shafts with a diameter of 2 - 4 mm are suitable for opening drainpipes . In latest embodiments, the core is a flexible, braided cord, by means of which the internal diameter of the polymer layer is increased in step with the external diameter. Thus, for example, in one torsion shaft with a diameter of 8 mm (Figures 5 and 6) , the rubber core cord 18' (braided) has a diameter of 2 mm. On top of it is a thin (0.1 mm) polyethylene membrane 11 to prevent the absorption of epoxy resin. A first reinforcing- wire layer 16, with a thickness of 600 Tex (glass-fibre) at a winding angle of 65°, set at a low angle, comes first in the polymer layer 17 (thickness 1.5 mm) . Layers of the same polymer follow on top of it at a steeper 70° angle, but alternating in different directions, layer 16' of glass-fibre, until a total thickness of 1.5 mm is achieved. A layer 16" of reinforcing- fibre comes into an elastic epoxy layer 17' (thickness 1.5 mm) at an increasingly steep angle (75°), until the last layer 16"' of 3-mm flat wire is hoop wound at about 78°. About 14 reinforcing-fibre layers are made with 0.2-mm wire (roving), by which a thickness of about 3 mm is achieved together with the epoxy resin. Reinforcing fibres: glass-fibre, polyamide (Nylon®), aramid (Kevlar®) , UHMWPE (Dyneema®) , carbon fibre. Rovings to be used 100 - 600 Tex (glass-fibre bunches) , in a circular fibre bunch, thickness 0.1 - 1 mm. A particular application of the flexible torsion shaft is brushing cleaning devices for air-conditioning ducts, of which an example is the device according to utility model FI-U-9567, shown in Figure 7. The flexible torsion shaft according to the invention is suitable for nearly all machines designed for a corresponding task, in which the flexible torsion shaft together with the casing tube can be reeled onto a reel of a quite small diameter (60 - 120 cm) . In the brush cleaning device according to Figure 7, a disc 34 is set to be rotated with the aid of a shaft 35. On the circumference of the disc 34 are pins 34.1, between which the flexible torsion shaft 10 with a casing tube is reeled. The brush device 31 is attached to the flexible shaft in the hub 32. The start of the casing tube 14 is permanently attached to the body of the motor assembly 33 and the torsion shaft 12 itself is attached to a rotating toothed-belt gearwheel 33.2. The rotating force generally comes through the shaft, but the construction of the rotation device is not within the scope of the present invention.

Claims

1. Flexible torsion shaft (12), which is intended to be attached to a drive shaft, characterized in that the flexible torsion shaft (12) is composite comprising a polymeric base substance (17, 17') and a mu 11 i - 1 aye red (16, 16", 16"') reinforcing-fibre reinforcement wound at an angle of 45° - 85°, preferably 60° - 80°.
2. Flexible torsion shaft (12) according to Claim 1, characterized in that at least one polymeric base substance is epoxy .
3. Flexible torsion shaft (12) according to Claim 1 or 2, characterized in that at least one reinforcing fibre is any of the following glass fibre, polyamide, aramid, UHMWPE, or carbon fibre .
4. Flexible torsion shaft (12) according to any of Claims 1 - 3, characterized in that the reinforcing fibre first wound around the core is at a lower angle than the other fibre layers, i.e. an angle of 45° - 70°, preferably 55° - 68°.
5. Flexible torsion shaft (12) according to any of Claims 1- 4, characterized in that the polymer is in at least two layers
(17, 17'), in which the inner one (17) is of a harder polymer and the outer one (17') of a more elastic polymer.
6. Flexible torsion shaft (12) according to any of Claims 1 - 5, characterized the length of the flexible torsion shaft (12) is 1 - 40 m.
7. Flexible torsion shaft (12) according to Claim 6, characterized in that the nominal torque M is in the range 2 - 30 Nm and the diameter D of the torsion shaft is then in the range
D = 2,2 mm x 7(M/Nm) +30%
8. Flexible torsion shaft (12) according to any of Claims 1 -
7, characterized in that the minimum curvature radius of the flexible torsion shaft (12) is 30 - 200 cm, preferably 50 - 100 cm .
9. Flexible torsion shaft (12) according to any of Claims 1 -
8, characterized the weight of the fibres is 50 - 75 % of the total weight.
10. Arrangement (10) in connection with a torsion shaft, characterized in that the arrangement includes a casing tube
(14) fitted to a torsion shaft (12) according to any of the Claims .
11. Arrangement (10) according to Claim 10, characterized in that the casing tube (14) is of polyamide.
12. Device for cleaning air-conditioning ducts, which device includes reeling means (34, 34.1) for a flexible torsion shaft (12) fitted with a casing tube (14), drive-motor machinery (33) for rotating the flexible torsion shaft (12), and a brush device (32) attached to the free end of the flexible torsion shaft (12), characterized in that the flexible torsion shaft (12) and the casing tube (14) are the arrangement according to Claim 9 or 10.
PCT/FI2016/050146 2015-03-10 2016-03-10 Flexible torsion shaft, arrangement and device for cleaning air-conditioning ducts WO2016142586A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP16761149.0A EP3268139A4 (en) 2015-03-10 2016-03-10 Flexible torsion shaft, arrangement and device for cleaning air-conditioning ducts
US15/698,371 US10736412B2 (en) 2015-03-10 2017-09-07 Flexible torsion shaft and an arrangement using it and a cleaning device for air-conditioning ducts

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FI20155157 2015-03-10
FI20155157 2015-03-10
FI20165025 2016-01-15
FI20165025 2016-01-15

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US15/698,371 Continuation-In-Part US10736412B2 (en) 2015-03-10 2017-09-07 Flexible torsion shaft and an arrangement using it and a cleaning device for air-conditioning ducts

Publications (1)

Publication Number Publication Date
WO2016142586A1 true WO2016142586A1 (en) 2016-09-15

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US (1) US10736412B2 (en)
EP (1) EP3268139A4 (en)
WO (1) WO2016142586A1 (en)

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US20170367470A1 (en) 2017-12-28
US10736412B2 (en) 2020-08-11
EP3268139A4 (en) 2018-11-07
EP3268139A1 (en) 2018-01-17

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