Patent ID: 9683555
Date: 2017-06-20
CPC Classifications: F03D,Y02B,Y02E

Claim:
1. A wind power installation comprising: a nacelle for a wind driven power plant; a hatch opening located on a top side of the nacelle; a hatch cover to cover the hatch opening, the hatch cover comprising a plurality of segments configured to remain within the hatch opening when a hatch is in an open position, and wherein the segments of the hatch cover are in an at least partially upright position when the hatch is open and a substantially horizontal position when the hatch cover is closed; a movable sealing mechanism configured to engage the plurality of segments in a sealing position when the hatch cover is in the closed position and to retract from the sealing position in order to enable the plurality of segments to move; and a helicopter hoisting platform, wherein the nacelle and the helicopter hoisting platform are configured such that the helicopter hoisting platform overlaps the nacelle in a longitudinal direction away from a rotor of the wind driven power plant and extends beyond the nacelle, wherein the nacelle is configured to at least partially integrate the helicopter hoisting platform in a vertical direction and partially integrate the helicopter hoisting platform in the longitudinal direction, wherein the helicopter hoisting platform is narrower than the nacelle in a transversal direction, and wherein the nacelle provides a recess for accommodating a part of the helicopter hoisting platform, the recess having a length in the longitudinal direction being shorter than a total length of the helicopter hoisting platform in the longitudinal direction and a height in the vertical direction being greater than zero.