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A lift construction for lifting and lowering a blade of a windmill is described herein. The lift construction for lifting and lowering a blade of a windmill to and from its mounted position at a rotatable cone of the windmill comprises a first yoke mountable at the inside of the blade and a second y

A lift construction for lifting and lowering a blade of a windmill is described herein. The lift construction for lifting and lowering a blade of a windmill to and from its mounted position at a rotatable cone of the windmill comprises a first yoke mountable at the inside of the blade and a second yoke mountable in the cone of the windmill, wherein the first yoke and the second yoke are arranged to cooperate.

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1. A lift construction for lifting and lowering a blade (2) of a windmill to and from its mounted position at a rotatable cone (7) of the windmill, wherein a yoke is mountable in said cone, characterized in that it comprises two yokes: a first yoke (1) of said two yokes mountable to opposing sides a

1. A lift construction for lifting and lowering a blade (2) of a windmill to and from its mounted position at a rotatable cone (7) of the windmill, wherein a yoke is mountable in said cone, characterized in that it comprises two yokes: a first yoke (1) of said two yokes mountable to opposing sides at the inside of the blade (9), anda second yoke (8) of said two yokes mountable in the cone (7) of the windmill,wherein the first yoke (1) and the second yoke (8) are arranged to cooperate, whereinthe first yoke (1) and the second yoke (8) have cooperating hoisting means (10, 9′) that are provided at ends of the yokes which, when in use, are distant from a standard of the windmill, wherein the hoisting means comprise a winch (9′, 9″) and one of a block (10) or pad eye, andwherein one of the first yoke (1) or the second yoke (8) has a receptacle (11) and the other of the first yoke (1) and the second yoke (8) has an actuator (12) near to the ends of the yokes (1,8) which, when in use, are closest to the windmill's standard to cooperatively position the yokes and maintain a predefined alignment and/or distance between the ends of the yokes (1,8). 2. The lift construction according to claim 1, characterized in that the actuator (12) has an end that fits in said receptacle (11), such that upon activation of the actuator (12) a predefined pressure is applied to the receptacle (11) to balance the blade (2) of the windmill at a predefined angle and/or position. 3. The lift construction according to claim 2, characterized in that when at the predefined angle and/or position, the blade (2) of the windmill occupies a position with respect to the cone (7) of the windmill that allows the blade (2) to be mounted or dismounted from the cone (7). 4. The lift construction according to claim 1, characterized in that the first yoke (1) comprises at both ends (3, 4) of the first yoke (1) pins (5), that when in use point at the blade's inside for mounting the first yoke (1) to the blade (2). 5. The lift construction according to claim 4, characterized in that the pins (5) are placed at a position so as to be able to cooperate with pin-holes (6) in the blade (2) that are intended for connecting the blade (2) to the windmill's cone (7). 6. The lift construction according to claim 1, characterized in that the second yoke (8) includes the winch (9′, 9″) connectable to the block (10) or the pad eye included in the first yoke (1). 7. The lift construction according to claim 6, characterized in that the winch (9″) of the second yoke (8) is adjustable. 8. The lift construction according to claim 1, further comprising: a guiding arm (13) for a lifting cable (14), wherein the guiding arm (13) is connectable to the second yoke (8). 9. The lift construction according to claim 8, characterized in that the lifting cable (14) is connectable to the first yoke (1) or a part thereof, in particular to hoisting means (10) or a pad eye provided on the first yoke (1). 10. The lift construction according to claim 8, characterized in that the guiding arm (13) is supported, preferably by connecting chains (15) that connect the guiding arm (13) to the windmill's cone (7) or a part thereof. 11. A yoke (1) suitable for mounting at an inside of a blade (2) of a windmill, the yoke having ends (3,4) that when in use face the inside of the blade (2), and the ends (3,4) are movable to and from each other, characterized in that the yoke includes at least one block (10) or pad eye near an end (4) of the blade (2) that when in use faces the inside of the windmill's blade (2), the yoke further including at the end (3) opposite to the end (4) where the block (10) or the pad eye is located, a receptacle (11) to cooperate with an actuator (12) of a second yoke (8) to position the yokes (1,8) in relation to one another. 12. The yoke (1) according to claim 11, wherein the receptacle (11) is arranged to cooperate with actuator (12) of a second yoke (8) to press both yokes (1, 8) apart from one another. 13. The yoke (1) according to claim 11, characterized in that the yoke comprises at both ends (3, 4) pins (5), that when in use are for mounting the yoke to a blade (2) of a windmill. 14. The yoke (1) according to claim 13, characterized in that the pins (5) are placed at a position on as to be able to cooperate with pin-holes (6) in the blade (2) that are intended for connecting the blade (2) to a windmill's cone (7). 15. A method for mounting or dismounting a windmill's blade (2) to a cone (7) of a windmill, characterized in that two yokes (1, 8) are employed, the method comprising: mounting a first yoke (1) to the blade's inside,mounting a second yoke (8) in the windmill's cone (7),wherein the first yoke (1) includes a receptacle (11) and a block (10) or a pad eye, and the second yoke (8) includes an actuator (12) and a winch (9′),wherein the method is executed such that when the blade (2) is near to the windmill's cone (7), the receptacle (11) and a block (10) or a pad eye of the first yoke (1) interact cooperatively with the actuator (12) and a winch (9′) of the second yoke (8) to move the windmill's blade (2) towards or away from the cone (7) in a line that substantially coincides with the blade's orientation when in the mounted position, and that when the blade (2) is beyond a predefined distance with respect to the windmill's cone (7), the blade (2) is lifted or lowered substantially vertically.