WO2008124893A1 - Wind rotor device - Google Patents

Wind rotor device Download PDF

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Publication number
WO2008124893A1
WO2008124893A1 PCT/BE2008/000004 BE2008000004W WO2008124893A1 WO 2008124893 A1 WO2008124893 A1 WO 2008124893A1 BE 2008000004 W BE2008000004 W BE 2008000004W WO 2008124893 A1 WO2008124893 A1 WO 2008124893A1
Authority
WO
WIPO (PCT)
Prior art keywords
wind
rotary axis
vertical
electrical energy
generate electrical
Prior art date
Application number
PCT/BE2008/000004
Other languages
French (fr)
Inventor
Ivo Lemaire
Original Assignee
Ivo Lemaire
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 Ivo Lemaire filed Critical Ivo Lemaire
Publication of WO2008124893A1 publication Critical patent/WO2008124893A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor 
    • F03D1/04—Wind motors with rotation axis substantially parallel to the air flow entering the rotor  having stationary wind-guiding means, e.g. with shrouds or channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00—Components
    • F05B2240/10—Stators
    • F05B2240/13—Stators to collect or cause flow towards or away from turbines
    • F05B2240/131—Stators to collect or cause flow towards or away from turbines by means of vertical structures, i.e. chimneys
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00—Components
    • F05B2240/90—Mounting on supporting structures or systems
    • F05B2240/91—Mounting on supporting structures or systems on a stationary structure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2250/00—Geometry
    • F05B2250/50—Inlet or outlet
    • F05B2250/501—Inlet
    • F05B2250/5011—Inlet augmenting, i.e. with intercepting fluid flow cross sectional area greater than the rest of the machine behind the inlet
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/30—Wind power
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/728—Onshore wind turbines

Definitions

  • the invention is related to a wind rotor device with vertical rotary axis. It consists of one single module equipped with horizontally installed rotors fitted with one or more rotor blades.
  • the vertical rotary axis is surrounded on its periphery by flat vertical fixed guiding plates. Secondary guiding plates adjustable from a horizontal to a vertical position are installed under a specific angle between the latter allowing an air current to flow optimally to the horizontally installed rotors via an air duct regardless of the wind direction.
  • the wind rotor device consists of several guiding plates adjustable from a horizontal to a vertical position depending on the local needs and conditions. This is meant to generate electrical energy.
  • our invention aims at achieving a device which is capable to guide airflows to one or more rotors regardless of the wind direction.
  • the position as well as the number of flat guiding plates are both important.
  • the number of flat vertical guiding plates preferably lies between 2 and 16.
  • the device and the modular configuration of all its components allow it to be operated both under domestic and industrial conditions.
  • the module can be custom made depending on its intended application, wind force and location. This offers an advantage. As a result of the above mentioned characteristics, the angle under which the flat vertical guiding plates are installed around the vertical axis become dependent on the number of guiding plates.
  • the flat guiding plates which are adjustable from a horizontal to a vertical position are positioned under a specific inclination angle between the flat vertical guiding plates in a such a way that the air flow, regardless of the wind direction, moves optimally through an air duct to the rotors.
  • the inclination angle lies between 30° and 60°.
  • the configuration of the rotor determines its rotation direction.
  • Each rotor is set up according to the principle of the traditionnal windmills with an horizontal axis.
  • the configuration of the module causes the air flow to move optimally to one or several rotors.
  • This rotor can be installed above the gap between the vertical guiding plates or in the roof construction of the wind rotor device.
  • the hight of the construction depends on its location.
  • Flat guiding plates adjustable from a horizontal to a vertical position can be inserted as many as needed.
  • the roof construction of the wind device can be fitted with solar panels.
  • the device and the modular configuration of all its components allow it to be installed on flat roofs as well as on inclined roof with a given inclination angle. Without any kind of problem, the device can also be operated in locations with continuous wind flows, Le. in open spaces, between buildings, thus creating the so called tunnel effect
  • Drawing IA Set up between two buildings — Top view of a wind device fitted with several wind shafts.
  • the example of drawing IA-L shows a wind device with one horizontally installed rotor (A).
  • the example of drawing IA-R shows a wind device with several rotors (B).
  • a number of flat vertical fixed guiding plates (E) are fitted on the periphery of me rotor. These vertical guiding plates are flat plates extending under an specific angle and over a specific distance away form the central roto ⁇ axis. (O).
  • the rotation direction of the rotor depends on the set up and construction of the rotor and not • on the guiding plates.
  • Each outside extremity (El) of the vertical guiding plate (E) is always situated on the same imaginary line connecting the centre (O) to the inside extremity (E2) of the vertical guiding plate (E).
  • the inside extremity (E2) begins at a specific distance OE2 of the central rotor axis.
  • the outside flat vertical fixed guiding plates are elongated untill the adjacent wall or building. (E1-E3). Due to the fact that the wind device is installed between i.e. two buildings or walls, wind may come from both directions according to the tunnel effect
  • This configuration is different as me central flat vertical fixed guiding plates and the flat guiding plates adjustable from a horizontal to a vertical position are redundant
  • the flat vertical installed guiding plates nearest to the wall are elongated untill the adjacent walls (and/or untill a possible adjacent identical wind device).
  • This configuration is different as several wind devices can be installed depending on the distance between for instance two buildings or walls.
  • the top view of drawing IA shows two of those.
  • the rotor is adapted accordingly.
  • the module shown in drawings 1A-L, 1A-R and 1B-L, 1b-R is equipped with six flat guiding plates adjustable (i.e. under an angle of 45°) from a horizontal to a vertical position (GOGl- G0G2-G0G3-G0G4-G0G5-G0G6). They axe installed between the flat vertical guiding panels in a such a way the air flow, regardless of the wind direction, moves optimally through an air duct to the rotors.
  • Drawing IB-L and IB-R Top and side view of a wind device w ⁇ m several air ducts. Considering, accordingly to the top view IB-L, that the circumference of the circle is divided into 12 imaginary equal parts, a polygone with 12 angles of 30° appears. This produces the 12 imaginary lines upon which the flat vertical guiding panels (E) are positioned.
  • Example 1B-R shows a wind device fitted with a single horizontal rotor (A).
  • a series of flat vertical fixed guiding plates (E) surround the vertical rotor on its periphery. These vertical guiding plates are flat plates extending under a specific angle and over a specific distance away form the central rotor axis. The rotation direction of the rotor depends on the set up and construction of the rotor and not on the guiding plates.
  • Each outside extremity (E1) of the vertical guiding plate (E) is always situated on the same imaginary line connecting the centre (O) to the inside extremity (E2) of the vertical guiding plate (E).
  • the inside extremity (E2) begins at a specific distance OE2 of the central rotor axis.
  • Drawing 1B-R shows the rudimentary rotor-generator transmission mechanism.
  • the module's set up ensures the air flow throuhg the air ducts to the rotor.
  • This rotor can be installed above the gap between the vertical guiding plates (Drawing IB-R), in the roof construction of the wind rotor device or above the air ducts themselves (Drawing 1B-L).
  • the wind device roof contstruction secures the roof as well as the rotor axis.
  • the rotor blades involved in this application are made of epoxy reinforced glass fibre. It is equally obvious to the expert that other rotor types and materials ensuring the same properties as the above mentionned materials , also qualify to be part of the protected domain of this invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Wind Motors (AREA)

Abstract

A wind rotor device with vertical rotary axis (0) upon which one or several horizontal rotors (A) fitted with blades are installed. This rotary axis is surrounded on its periphery by flat vertical fixed guiding plates (E). Between these plates (E), secondary guiding plates guiding the air flow from a horizontal to a vertical position are installed thus allowing an air current to flow to the horizontally installed rotors regardless of the wind direction. The wind device consist of a single module equipped with one or several rotors. This device allows to generate electrical energy.

Description

WIND ROTOR DEVICE
The invention is related to a wind rotor device with vertical rotary axis. It consists of one single module equipped with horizontally installed rotors fitted with one or more rotor blades. The vertical rotary axis is surrounded on its periphery by flat vertical fixed guiding plates. Secondary guiding plates adjustable from a horizontal to a vertical position are installed under a specific angle between the latter allowing an air current to flow optimally to the horizontally installed rotors via an air duct regardless of the wind direction. The wind rotor device consists of several guiding plates adjustable from a horizontal to a vertical position depending on the local needs and conditions. This is meant to generate electrical energy.
Within the scope of environmental issues and decreasing fossil fuel reserves, there is a great need of alternatives to generate electricity. The use of turbines driven with fluids is well known in the present state of the art. Those turbines mostly are equipped with an horizontal axis fitted with turbine blades driven by the wind. Turbine blades having a particular shape such as a convex configuration intended to reduce turbulence in the air flow are used.
The use of turbines with vertical axis is also known. However, a problem occurs when wind directions change wich does not always result in an optimal air flow.
Accordingly, our invention aims at achieving a device which is capable to guide airflows to one or more rotors regardless of the wind direction. In this respect, the position as well as the number of flat guiding plates are both important.
The number of flat vertical guiding plates preferably lies between 2 and 16.
The device and the modular configuration of all its components allow it to be operated both under domestic and industrial conditions.
The module can be custom made depending on its intended application, wind force and location. This offers an advantage. As a result of the above mentioned caracteristics, the angle under which the flat vertical guiding plates are installed around the vertical axis become dependent on the number of guiding plates.
The flat guiding plates which are adjustable from a horizontal to a vertical position are positioned under a specific inclination angle between the flat vertical guiding plates in a such a way that the air flow, regardless of the wind direction, moves optimally through an air duct to the rotors. The inclination angle lies between 30° and 60°.
The configuration of the rotor determines its rotation direction. Each rotor is set up according to the principle of the traditionnal windmills with an horizontal axis.
The configuration of the module causes the air flow to move optimally to one or several rotors. This rotor can be installed above the gap between the vertical guiding plates or in the roof construction of the wind rotor device.
The hight of the construction depends on its location. Flat guiding plates adjustable from a horizontal to a vertical position can be inserted as many as needed. This offers an advantage. In the case of larger modules, the roof construction of the wind device can be fitted with solar panels. This offers an further advantage. The device and the modular configuration of all its components allow it to be installed on flat roofs as well as on inclined roof with a given inclination angle. Without any kind of problem, the device can also be operated in locations with continuous wind flows, Le. in open spaces, between buildings, thus creating the so called tunnel effect
The invention and its functioning axe shown in detail in drawing 1. It contains a front and a side view of the wind module with vertically installed flat guiding plates and a number of flat guiding plates adjustable from a horizontal to a vertical position. Example : 12 vertically installed flat guiding plates .
Drawing IA : Set up between two buildings — Top view of a wind device fitted with several wind shafts. The example of drawing IA-L shows a wind device with one horizontally installed rotor (A). The example of drawing IA-R shows a wind device with several rotors (B). A number of flat vertical fixed guiding plates (E) are fitted on the periphery of me rotor. These vertical guiding plates are flat plates extending under an specific angle and over a specific distance away form the central rotoτ axis. (O). The rotation direction of the rotor depends on the set up and construction of the rotor and not • on the guiding plates.
Each outside extremity (El) of the vertical guiding plate (E) is always situated on the same imaginary line connecting the centre (O) to the inside extremity (E2) of the vertical guiding plate (E). The inside extremity (E2) begins at a specific distance OE2 of the central rotor axis. The outside flat vertical fixed guiding plates are elongated untill the adjacent wall or building. (E1-E3). Due to the fact that the wind device is installed between i.e. two buildings or walls, wind may come from both directions according to the tunnel effect
This configuration is different as me central flat vertical fixed guiding plates and the flat guiding plates adjustable from a horizontal to a vertical position are redundant
The flat vertical installed guiding plates nearest to the wall are elongated untill the adjacent walls (and/or untill a possible adjacent identical wind device).
This configuration is different as several wind devices can be installed depending on the distance between for instance two buildings or walls. The top view of drawing IA shows two of those.
Other circumstances may require a wind device of bigger dimensions. The rotor is adapted accordingly.
The module shown in drawings 1A-L, 1A-R and 1B-L, 1b-R, is equipped with six flat guiding plates adjustable (i.e. under an angle of 45°) from a horizontal to a vertical position (GOGl- G0G2-G0G3-G0G4-G0G5-G0G6). They axe installed between the flat vertical guiding panels in a such a way the air flow, regardless of the wind direction, moves optimally through an air duct to the rotors.
Drawing IB-L and IB-R : Top and side view of a wind device wϊm several air ducts. Considering, accordingly to the top view IB-L, that the circumference of the circle is divided into 12 imaginary equal parts, a polygone with 12 angles of 30° appears. This produces the 12 imaginary lines upon which the flat vertical guiding panels (E) are positioned. Example 1B-R shows a wind device fitted with a single horizontal rotor (A). A series of flat vertical fixed guiding plates (E) surround the vertical rotor on its periphery. These vertical guiding plates are flat plates extending under a specific angle and over a specific distance away form the central rotor axis. The rotation direction of the rotor depends on the set up and construction of the rotor and not on the guiding plates.
Considering, accordingly to the top view 1B-L, that the circumference of the circle is divided into 12 imaginary equal parts, apolygone with 12 angles of 30° appears. This produces the 12 imaginary lines upon which the flat vertical guiding panels (E) are positioned.
Each outside extremity (E1) of the vertical guiding plate (E) is always situated on the same imaginary line connecting the centre (O) to the inside extremity (E2) of the vertical guiding plate (E). The inside extremity (E2) begins at a specific distance OE2 of the central rotor axis.
Drawing 1B-R shows the rudimentary rotor-generator transmission mechanism. The module's set up ensures the air flow throuhg the air ducts to the rotor.
This rotor can be installed above the gap between the vertical guiding plates (Drawing IB-R), in the roof construction of the wind rotor device or above the air ducts themselves (Drawing 1B-L). The wind device roof contstruction secures the roof as well as the rotor axis.
It is obvious to the expert that conventional devices, such as state of the art techniques, also qualifies to be part of the protected domain of this invention.
The rotor blades involved in this application are made of epoxy reinforced glass fibre. It is equally obvious to the expert that other rotor types and materials ensuring the same properties as the above mentionned materials , also qualify to be part of the protected domain of this invention.
Larger modules allow the installation of solar panels on the roof construction of the wind device. This version of the device can also be operated in locations with continuous wind flows, i.e. in open spaces, between buildings, thus creating the so called tunnel effect

Claims

Conclusions : a) A wind rotor device with vertical rotary axis meant to generate electrical energy consisting of one single module equipped with one or several , as well as of a number of flat vertical fixed guiding plates installed on the periphery of the central rotor axis, with inside and outside extremities between which flat guiding plates adjustable from a horizontal to a vertical position are installed thus allowing an air current to flow to the horizontally installed rotors regardless of the wind direction. b) A wind rotor device with vertical rotary axis meant to generate electrical energy according to previous conclusion and characterized by the fact : one single wind device consisting of one roof Construction and one wind module. c ) A wind rotor device with vertical rotary axis meant to generate electrical energy according to previous conclusion and characterized by the fact : an appropriate wind device to be installed on buildings with flat roofe as well as inclined roofs with a given inclination angle. d ) A wind rotor device with vertical rotary axis meant to generate electrical energy according to previous conclusion and characterized by the fact : The number of flat vertical guiding plates of the wind module lies between 2 and 16. e ) A wind rotor device with vertical rotary axis meant to generate electrical energy according to previous conclusion and characterized by die fact : Flat guiding plates adjustable from a horizontal to a vertical position can be inserted as many as needed according to the local circumstances. f ) A wind rotor device with vertical rotary axis meant to generate electrical energy according to previous conclusion and characterized by the fact : the wind module consist of one or several rotors and each rotor blade extends outwards from the central rotor axis. g ) A wind rotor device with vertical rotary axis meant to generate electrical energy according to previous conclusion and characterized by the fact : the wind module consist of one or several rotors and each rotor blade is made of plastic material and epoxy resin reinforced glass fibre. h ) A wind rotor device with vertical rotary axis meant to generate electrical energy according to conclusion 1 and characterized by the fact : the device is equipped with a generator and a transmission system. i) A wmd rotor device with vertical rotary axis meant to generate electrical energy according to previous conclusion and characterized by the fact : a roof construction on the wind device. j ) A wind rotor device with vertical rotary axis meant to generate electrical energy according to previous conclusion and characterized by the fact : solar panels can be installed on top of the wind device. A wind rotor device with vertical rotary axis surrounded on its periphery by flat vertical fixed guiding plates in between which secondary guiding plates adjustable from a horizontal to a vertical position are installed thus allowing an air current to flow to the horizontally installed rotors regardless of the wind direction.
PCT/BE2008/000004 2007-01-31 2008-01-31 Wind rotor device WO2008124893A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE2007/0037 2007-01-31
BE2007/0037A BE1017452A7 (en) 2007-01-31 2007-01-31 A WIND DEVICE WITH VERTICAL TURNTABLE SURROUNDED BY ITS PERIPHERIA BY FIXED VERTICALLY LOCATED GUIDE PLATES AND THROUGH FLAT OF HORIZONTAL TO VERTICALLY LOCATED GUIDE PLATES HAVE BEEN SIZED WHILE IT WERE SOME NECESSARY THAT THEY WERE SIGNED WHILE IT WERE SOMETIMED THAT THEY WERE SIZED.

Publications (1)

Publication Number Publication Date
WO2008124893A1 true WO2008124893A1 (en) 2008-10-23

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ID=39712316

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/BE2008/000004 WO2008124893A1 (en) 2007-01-31 2008-01-31 Wind rotor device

Country Status (2)

Country Link
BE (1) BE1017452A7 (en)
WO (1) WO2008124893A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2476761A1 (en) * 1980-02-26 1981-08-28 Tech Atlantique Centre Multiple volute static wind power converter - uses volute trunking round vertical axis to collect wind and deliver it vertically to turbine with generator
FR2530297A1 (en) * 1982-07-15 1984-01-20 Somdiaa Device generating power by the rotation of a propeller under the effect of a movement of air
DE3407881A1 (en) * 1984-03-03 1985-09-12 Franz Karl 8500 Nürnberg Krieb Energy supply system
EP1515039A1 (en) * 2002-05-16 2005-03-16 Hidemi Kurita Vertical shaft driving device for vertical shaft wind mills or the like, and electric power generator using the same
BE1017044A6 (en) * 2006-03-10 2007-12-04 Lemaire Ivo Wind turbine, has rotors with guide plates extending horizontally at outer periphery and vertically at inner periphery next to vertical rotation axis

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2476761A1 (en) * 1980-02-26 1981-08-28 Tech Atlantique Centre Multiple volute static wind power converter - uses volute trunking round vertical axis to collect wind and deliver it vertically to turbine with generator
FR2530297A1 (en) * 1982-07-15 1984-01-20 Somdiaa Device generating power by the rotation of a propeller under the effect of a movement of air
DE3407881A1 (en) * 1984-03-03 1985-09-12 Franz Karl 8500 Nürnberg Krieb Energy supply system
EP1515039A1 (en) * 2002-05-16 2005-03-16 Hidemi Kurita Vertical shaft driving device for vertical shaft wind mills or the like, and electric power generator using the same
BE1017044A6 (en) * 2006-03-10 2007-12-04 Lemaire Ivo Wind turbine, has rotors with guide plates extending horizontally at outer periphery and vertically at inner periphery next to vertical rotation axis

Also Published As

Publication number Publication date
BE1017452A7 (en) 2008-10-07

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