US4451959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods for securing a rotor blade within a rotor assembly and removing a rotor blade therefrom
Assignee: Elliott Turbomachinery Co Inc
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Filing: 1982-09-29
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Granted: 1984-06-05
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Expires: 2002-09-29
Abstract
Abstract A rotor assembly and methods for securing rotor blades within and removing rotor blades from rotor assemblies. The rotor assembly comprises a rotor disc defining a plurality of blade grooves, and including a plurality of tenons disposed between the blade grooves and defining a plurality of pin sockets radially extending inward from outside surfaces of the tenons; and a plurality of rotor blades, each blade including a root disposed within a blade groove to secure the blade against radial movement, and a blade platform overlaying a tenon and defining a radially extending pin aperture. The rotor assembly further comprises a plurality of locking pins radially extending through the pin apertures and into the pin sockets to secure the rotor blades against axial movement, each pin including a head and a base to limit radial movement of the pin.
Inventors
- 👤 Arthur J. Miller
- 👤 Charles H. Kostors
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:11
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/30; F01D5/32; F01D5/326; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49318; Y10T29/49815; Y10T29/49821
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
171 words
A method for removing a rotor blade from a rotor assembly; the rotor assembly including a rotor disc defining an axially extending blade groove and a pin socket radially extending inward from an outside surface of the rotor disc; the rotor blade including a root disposed within the blade groove, and a platform overlaying the outside surface of the rotor disc and defining a pin aperture; the rotor assembly further including a locking pin extending through the pin aperture and into the pin socket to lock the rotor blade to the rotor disc, the locking pin having a head projecting over the blade platform, a base projecting beneath the blade platform, and a stem extending between the head and the base, the method comprising the steps of: removing the head of the pin; moving the pin stem and base radially into the pin socket and below the blade platform; axially sliding the blade root out of the blade groove; and pulling the pin stem and base out of the pin socket.
Claim 2
Independent Claim
171 words
A method for removing a rotor blade from a rotor assembly; the rotor assembly including a rotor disc defining an axially extending blade groove and a pin socket radially extending inward from an outside surface of the rotor disc; the rotor blade including a root disposed within the blade groove, and a platform overlaying the outside surface of the rotor disc and defining a pin aperture; the rotor assembly further including a locking pin extending through the pin aperture and into the pin socket to lock the rotor blade to the rotor disc, the locking pin having a head projecting over the blade platform, a base projecting beneath the blade platform, and a stem extending between the head and the base, the method comprising the steps of: removing the head of the pin; moving the pin stem and base radially into the pin socket and below the blade platform; axially sliding the blade root out of the blade groove; and pulling the pin stem and base out of the pin socket.
Claim 3
Dependent Claim
40 words
A method as defined by claim 1 wherein the pulling step includes the steps of: inserting a tap into the pin stem; and pulling the tap radially outward to pull the pin stem and base out of the pin socket.
Claim 4
Dependent Claim
38 words
A method as defined by claim 2 wherein the moving step includes the steps of: inserting the tap into the pin; and forcing the tap radially inward to force the pin stem and base into the pin socket.
Claim 5
Dependent Claim
22 words
A method as defined by claim 1 wherein the removing step includes the step of machining off the head of the pin.
Claim 6
Dependent Claim
26 words
A method as defined by claim 4 wherein the machining step includes the step of employing a drill to mill off the head of the pin.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-05 | 1987-12-05 | 1988-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-05 | 1991-12-05 | 1992-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-05 | 1995-12-05 | 1996-06-05 | $7700.00 | Window Closed / Lapsed |