US4029436A — Blade root feather seal

Claim 1

Independent Claim 147 words

A rotor construction including: a disk having a plurality of axially extending blade root receiving slots in its periphery with peripheral lands between the slots, a plurality of blades having roots positioned in the slots with blade platforms on each blade extending circumferentially toward the platforms on adjacent blades and overlying the peripheral lands, adjacent platforms terminating in closely spaced relation to one another, and a thin flexible, flat seal element positioned between each land and the overlying blade platforms and extending across the space between the adjacent platforms, said seal having means thereon to locate each seal element axially of the disk, the undersides of the platforms having recesses therein to form narrow flanges adjacent the outer edges of the platforms to engage the seal element, the narrow flanges being significantly narrower than the seal element to reduce the area of the seal element engaged thereby.

Claim 2

Dependent Claim 147 words

A rotor construction including: a disk having a plurality of axially extending blade root receiving slots in its periphery with peripheral lands between the slots, a plurality of blades having roots positioned in the slots with blade platforms on each blade extending circumferentially toward the platforms on adjacent blades and overlying the peripheral lands, adjacent platforms terminating in closely spaced relation to one another, and a thin flexible, flat seal element positioned between each land and the overlying blade platforms and extending across the space between the adjacent platforms, said seal having means thereon to locate each seal element axially of the disk, the undersides of the platforms having recesses therein to form narrow flanges adjacent the outer edges of the platforms to engage the seal element, the narrow flanges being significantly narrower than the seal element to reduce the area of the seal element engaged thereby.

Claim 3

Dependent Claim 48 words

A rotor construction as in claim 1 in which the undersides of adjacent blade platforms are grooved to receive the seal element and locate it circumferentially of the disk, the width of the cooperating grooves in adjacent blade platforms corresponding substantially to the width of the seal element.

Claim 4

Dependent Claim 22 words

A rotor construction as in claim 2 in which the grooves are substantially the same depth as the thickness of the seal.

Claim 5

Dependent Claim 35 words

A rotor construction as in claim 1 in which said flanges are notched and the seal element has at least one transverse rib engaging in the cooperating notch to retain the seal in axial position.

Claim 6

Dependent Claim 35 words

A rotor construction as in claim 1 in which the undersides of the platforms have aligned notches therein and the seal has a transverse rib to engage the notches for locating the seal in position.

Claim 7

Dependent Claim 25 words

A rotor construction as in claim 2 in which the seal has end flanges for additionally retaining the seal in position axially of the disk.

Claim 8

Dependent Claim 140 words

The combination with a bladed rotor including a rotor having a row of axially extending blade root receiving slots on its periphery and peripheral lands between the slots, and a row of blades on the disk periphery having roots fitting in the slots and operative blade elements extending outwardly therefrom, each blade having platforms thereon overlying the lands on the disk and the platforms of adjacent blades being closely spaced from one another to form a space overlying the land, of a seal element located between each land and the overlying platforms and extending across said space, said element being thin and flexible and having means to locate said seal axially of the disk, said means including a transverse rib on the element between its ends and a notch in the underside of the platform to receive the transverse rib.

Claim 9

Dependent Claim 140 words

The combination with a bladed rotor including a rotor having a row of axially extending blade root receiving slots on its periphery and peripheral lands between the slots, and a row of blades on the disk periphery having roots fitting in the slots and operative blade elements extending outwardly therefrom, each blade having platforms thereon overlying the lands on the disk and the platforms of adjacent blades being closely spaced from one another to form a space overlying the land, of a seal element located between each land and the overlying platforms and extending across said space, said element being thin and flexible and having means to locate said seal axially of the disk, said means including a transverse rib on the element between its ends and a notch in the underside of the platform to receive the transverse rib.

Claim 10

Dependent Claim 24 words

The combination as in claim 7 in which the undersides of the platforms are grooved to provide a space to receive the seal element.

Claim 11

Dependent Claim 55 words

The combination as in claim 7 in which the undersides of the platforms are grooved to receive the seal element, the width of the cooperating grooves in adjacent platforms corresponding substantially to the width of the seal element, and the depth of the grooves being substantially the same as the thickness of the seal element.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1980-06-13	1980-12-13	1981-06-14	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1984-06-13	1984-12-13	1985-06-14	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1988-06-13	1988-12-13	1989-06-14	$7700.00	Window Closed / Lapsed

Blade root feather seal

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